CN207475843U - The control circuit and audio frequency apparatus of audio power - Google Patents
The control circuit and audio frequency apparatus of audio power Download PDFInfo
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Abstract
The utility model provides the control circuit and audio frequency apparatus of a kind of audio power.The control circuit of the audio power include for detect input power type and to system control module send detection signal power detecting module, the input power type include external AC power and battery supply；For according to detection signal and the system control module of feedback signal output power amplifier control signal and power control signal；For exporting the DCPS digitally controlled power source module of power amplifier voltage according to power control signal；For controlling signal by power amplifier module of the power amplifier mode adjustment for bridge mode according to power amplifier；The output feedback module of feedback signal is sent for the output signal level for detecting power amplifier module and to system control module.The utility model can determine the operating mode and operating voltage of power amplifier module according to the power needed for input power type and load loud speaker, with the power of output adaptation.
Description
Technical Field
The utility model relates to an electronic circuit technique, especially a control circuit and audio equipment of audio power.
Background
When the existing sound box equipment is connected with an external power supply or powered by a battery, the power output can be changed in two ways. The first mode is as follows: through setting up the boost module, the output voltage of adjustment boost module, and then change the supply voltage of amplifier to change output power. The second way is: changing the output voltage in a mode of bridging two or more power amplifiers, and further changing the supply voltage of the amplifiers to change the output power; when the sound box is powered by an external power supply, the sound box can realize good sound effect by improving the output power in the above mode. However, when the speaker supplies power to the battery, the output power is increased, and the operating time of the speaker is limited by the battery capacity, so that the user experience is greatly reduced. In the prior art, a power control circuit which can automatically control output power to prolong effective working time and realize good sound effect is lacked, so that the output power can be changed according to the change of listening environment.
SUMMERY OF THE UTILITY MODEL
The object of the present invention is to solve at least one of the above technical drawbacks, especially the problem of increasing the power of the power amplifier module when the input voltage is an external ac power source.
The utility model provides a control circuit of audio power, include:
the power supply detection module is used for detecting the type of an input power supply and sending a detection signal to the system control module, wherein the type of the input power supply comprises an external alternating current power supply and a battery power supply; the system control module is used for outputting a power amplifier control signal and a power supply control signal according to the detection signal and the feedback signal; the numerical control power supply module is used for outputting power amplifier voltage according to the power supply control signal; the power amplification module is used for adjusting the power amplification mode to a bridge connection mode according to the power amplification control signal; and the output feedback module is used for detecting the output signal level of the power amplification module and sending a feedback signal to the system control module.
Preferably, the output feedback module includes:
a voltage dividing unit for attenuating the voltage output from the power amplifying module to output a divided voltage signal, an
And the coupling unit is used for coupling the divided voltage signal into a monitoring signal matched with the voltage range of the input interface of the system control module.
Preferably, the coupling unit includes a coupling capacitor, a first amplifying triode, a second amplifying triode and a linear optocoupler; one end of the coupling capacitor is connected with the voltage division signal, and the other end of the coupling capacitor is connected with a base electrode of the first amplification triode; an emitting electrode of the first amplifying triode is connected with a base electrode of the second amplifying triode through a linear optocoupler, and a collecting electrode of the first amplifying triode is connected to the numerical control power supply module; and the emitter of the second amplifying triode is connected to the input interface of the system control module, and the collector of the second amplifying triode is grounded.
Preferably, the output feedback module comprises resistors R1, R2, R3, R4, R5, R6 and R7, capacitors C1, C2, C3 and C4, an NPN triode Q1, a PNP triode Q2 and a linear optocoupler; one end of R1 is connected with the output signal level end, the other end is connected with one end of R2 and the anode of C1, the cathode of C1 is connected with the cathode of C2, the anode of C2 is connected with one end of R3 and R4, the other end of R3 is connected with one end of R5, the anode of R6 and the anode of R7 and the feedback voltage output end of the digital control power module, the other end of R5 is connected with the collector of Q1, the base of Q1 is connected with the anode of C1, the emitter of Q1 is connected with the input power end of the linear optical coupler, the input reference end and the output reference end of the linear optical coupler are connected with the other ends of R1 and grounded, the output power end of the linear optical coupler is connected with the other end of R1 and the base of Q1, the collector of Q1 is grounded, the emitter of Q1 is connected with the other end of R1, one end of C1 and the.
Further, the linear optical coupler is LCR 0202.
Preferably, the power detection module includes a voltage comparator LM393, the power signal and the reference voltage are respectively connected to the inverting input terminal and the forward input terminal of the same channel, and the output terminal of the channel is connected to the system control module.
Preferably, the power amplification module includes a first power amplification unit, a second power amplification unit, and an output control unit capable of controlling bridging of the first power amplification unit and the second power amplification unit.
Preferably, the control circuit further comprises an audio signal processing module for receiving an audio signal, and an output end of the audio signal processing module is connected with an input end of the power amplification module.
Furthermore, the control circuit also comprises an input switching module for switching multi-path input audio, and the output end of the input switching module is connected with the input end of the audio signal processing module.
Preferably, the control circuit further comprises a battery module for providing battery power to the system control module, and a charging module for charging the battery module; the charging module is also connected with an alternating current-direct current conversion module and is connected with the system control module through the power supply detection module.
The utility model discloses still provide an audio equipment, it includes aforementioned arbitrary control circuit.
The utility model has the advantages as follows:
1. the utility model discloses the control circuit of audio power can confirm the mode and the operating voltage of power amplification module according to the power that input power type and load speaker required to output the power of adaptation; when the input power type is an external alternating current power supply, the power amplification module can be set to be in a bridge connection mode so as to improve the output power of the power amplification module; and whether the working voltage of the power amplification module needs to be further improved or not can be determined according to the feedback signal of the output feedback module so as to further improve the output power of the power amplification module and optimize the power amplification effect so as to provide better sound effect.
2. When the input power type is a battery, the power amplification module can output smaller power so as to improve the cruising ability of the battery; when the input power type becomes battery power from external alternating current power supply, the utility model discloses a system control module can progressively reduce the operating voltage of power amplification module to avoid noise and the audio frequency effect sudden change that the power switch caused.
3. The utility model provides an output feedback module reduces the output signal level of power amplification module through the partial pressure unit, and direct current signal is kept apart to rethread coupling unit, can improve the control precision to with the higher signal level adjustment of power amplification module output with the interference for with system control module assorted high accuracy low-voltage signal.
4. The power amplification module in the control circuit of the audio power of the utility model can be expanded to comprise a multistage power amplification unit, and can also be expanded to receive multi-path audio input; when the system is applied to audio equipment, the system can be compatible with various audio input modes, can realize multi-stage amplification of audio signals through the system control module, and has wide adaptation range.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic diagram of a module connection according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a circuit embodiment of the output feedback module according to the present invention;
fig. 3 is a schematic diagram of a circuit of the power detection module according to the present invention;
fig. 4 is a schematic diagram of an embodiment of the audio device of the present invention;
fig. 5 is a schematic control flow diagram of the control circuit of the present invention;
fig. 6 is another schematic control flow diagram of the control circuit according to the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.
It will be understood by those within the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
In an embodiment shown in fig. 1, the present invention provides a control circuit for audio power, including:
the power supply detection module 1 is used for detecting the type of an input power supply and sending a detection signal to the system control module 2, wherein the type of the input power supply comprises an external alternating current power supply and a battery power supply; the system control module 2 is used for outputting a power amplifier control signal and a power supply control signal according to the detection signal and the feedback signal; the numerical control power module 3 is used for outputting power amplifier voltage according to the power control signal; the power amplification module 4 is used for adjusting the power amplification mode to a bridge connection mode according to the power amplification control signal; and the output feedback module 5 is used for detecting the output signal level of the power amplification module and sending a feedback signal to the system control module.
When the input power type detected by the power detection module 1 is an external alternating current power supply, the system control module 2 outputs a power control signal to the numerical control power module 3, so that the numerical control power module 3 outputs a preset output voltage, and simultaneously outputs a power amplification control signal to the power amplification module 4, so that the power amplification module 4 works in a bridge connection mode, and the output power of the power amplification module is improved; meanwhile, the output feedback module 5 can detect the level of the output signal in real time to monitor the output power of the power amplification module 4, and send the feedback signal to the system control module 2, and the system control module 2 judges whether the output voltage of the numerical control power supply module 3 needs to be further increased; if the output voltage of the numerical control power module 3 needs to be further increased, the system control module 2 outputs a power control signal to the numerical control power module 3 again, so that the numerical control power module 3 increases the working voltage of the power amplification module 4. The higher the output voltage of the numerical control power supply module 3 is, the higher the output power of the power amplification module 4 is, and the feedback signal detected by the output feedback module 5 is correspondingly improved; when the feedback signal reaches a preset maximum value or the output voltage of the numerical control power module 3 reaches the preset maximum value, the system control module 2 keeps the power amplification voltage output by the numerical control power module 3 at the current first working voltage so that the power amplification module 4 outputs a stable high-power amplification signal; thereby make the utility model discloses audio power's control circuit can be according to the difference of input power type, the output of automatic adjustment power amplification module 4 to compromise the different demands of battery powered and external alternating current power supply.
Referring to the embodiment shown in fig. 2, the output feedback module 5 in the control circuit of the present invention may include:
a voltage dividing unit for attenuating the voltage output from the power amplifying module to output a divided voltage signal, an
And the coupling unit is used for coupling the divided voltage signal into a monitoring signal matched with the voltage range of the input interface of the system control module.
The feedback signal of the power amplification module 4 can be connected to a point D in fig. 2, and after voltage division and attenuation, the feedback signal is connected to a corresponding port of the system control module 2 through a point E, so as to reduce the output voltage of the output feedback module 5 to a range that can be recognized by the system control module 2; if the power amplification module 4 includes two paths of amplification output units, the output ends of the two paths of amplification output units may be respectively connected to the circuits of fig. 2 to respectively obtain feedback signals of the two paths of amplification output units.
The voltage dividing unit 51 can be realized by a plurality of voltage dividing resistors connected in series, the coupling unit 52 can be realized by a coupling capacitor, and in order to improve the measurement accuracy of the feedback signal, the utility model provides a specific circuit shown in fig. 2, wherein the voltage dividing unit 51 is realized by connecting two resistors R1 and R2 in series, and the voltage dividing signal is led out between the two resistors; the coupling unit 52 comprises a coupling capacitor, a first amplifying triode Q1, a second amplifying triode Q2 and a linear optocoupler F; one end of the coupling capacitor is connected with the led-out voltage division signal, and the other end of the coupling capacitor is connected with the base electrode of a first amplifying triode Q1; an emitting electrode of the first amplifying triode Q1 is connected with a base electrode of the second amplifying triode Q2 through a linear optocoupler F, and a collecting electrode of the first amplifying triode Q1 is connected to the numerical control power supply module 3; the emitter of the second amplifying transistor Q2 is connected to the input interface of the system control module 2, and the collector is grounded.
In this embodiment, the linear optocoupler LCR0202 is used for isolating signals between the first amplifying triode Q1 and the second amplifying triode Q2, so that the high voltage output by the power amplifying module 4 can be isolated from a circuit connected to a microprocessor in the system control module 2, and the functions of protecting and improving the detection precision are achieved. After the feedback signal passes through a voltage division circuit consisting of a resistor R1 and a resistor R2, the level of the output signal is reduced and attenuated; the coupling capacitor in the embodiment is composed of two coupling capacitors C1 and C2 which are connected in series, so that the voltage resistance of the coupling capacitor is improved, and the detection precision is further improved; after passing through a capacitor C1/C2, an output signal gets rid of interference of a direct current signal and is coupled to an amplifying circuit formed by a first amplifying triode Q1 to drive a linear optocoupler to work, the linear optocoupler linearly reduces the resistance value of the linear optocoupler along with the increase of the emitter current of the first amplifying triode Q1, so that the base current of a second amplifying triode Q2 is changed, the emitter current of a second amplifying triode Q2 correspondingly changes, the output voltage of a point E also changes along with the change of the emitter current, and the changed voltage is output to a corresponding interface in a system control module 2, so that the feedback signal of each amplifying output unit in a power amplifying module 4 is obtained.
Referring to the specific circuit embodiment shown in fig. 2, the present invention further provides a control circuit for audio power, including: the system comprises a power supply detection module 1, a system control module 2, a numerical control power supply module 3, a power amplification module 4 and an output feedback module 5; the output end of the power supply detection module 1 is connected with the detection end of the system control module 2, and the control power supply end of the system control module 2 is connected with the control input end of the numerical control power supply module 3; the power amplifier control end of the system control module 2 is connected with the power amplification module 4, the power amplifier voltage output end of the numerical control power supply module 3 is connected with the power input point of the power amplification module 4, the output level end of the power amplification module 4 is connected with the input end of the output feedback module 5, and the output end of the output feedback module 5 is connected with the system control module 2; wherein,
the output feedback module 5 comprises resistors R1, R2, R3, R4, R5, R6 and R7, capacitors C1, C2, C3 and C4, an NPN triode Q1 (as a first amplifying triode Q1), a PNP triode Q2 (as a second amplifying triode Q2) and a linear optocoupler; one end of R1 is connected with an output signal level end, the other end is connected with one end of R2 and a positive electrode of C1, a negative electrode of C1 is connected with a negative electrode of C2, a positive electrode of C2 is connected with one ends of R3 and R4, the other end of R3 is connected with one ends of R5, R6 and R7, a positive electrode of C3 and a feedback voltage output end of the numerical control power module 3, the other end of R5 is connected with a collector of Q1, a base of Q1 is connected with a positive electrode of C1, an emitter of Q1 is connected with an input power supply end of the linear optical coupler, an input reference end and an output reference end of the linear optical coupler are connected with the other ends of R1 and grounded, an output power supply end of the linear optical coupler is connected with the other end of R1 and the base of Q1, the collector of Q1 is grounded, the emitter of Q1 is connected with the other end of R36.
The output signal level end is the signal output end level of the power amplification module, and the output signal level end is reduced after voltage division by R1 and R2 so as to carry out isolation and amplification treatment subsequently; the capacitors C1, C2 and C3 can be large-capacity electrolytic capacitors, and the C4 can be small-capacity capacitors without positive and negative electrodes; the feedback voltage output end of the numerical control power supply module 3 is used for providing working voltage for the signal detection module 5, and the detection end of the system control module 2 is used for receiving and outputting feedback signals processed by the feedback module 5. By adopting the control circuit with the structure, the level output by the power amplification module 4 is attenuated after voltage division, and is isolated by the linear optocoupler, so that the problem of accurately detecting the feedback signal can be solved.
The utility model discloses a power detection module 1 can adopt voltage comparator LM393 as detection circuitry core element, and power signal inserts reverse input and the forward input of voltage comparator LM393 same passageway respectively with reference voltage, and the output of this passageway inserts system control module. When no external alternating current power supply exists, the input power supply signal is lower than the reference voltage (the reference voltage can be set to be 2.5V), the output of the voltage comparator LM393 is at a high level, at the moment, the whole circuit works in a low-power mode, the power amplification module 4 is in a non-bridging state, and the numerical control power supply module 3 outputs a low voltage; on the contrary, when the external alternating current power supply is connected, the input power supply signal is higher than the reference voltage, and the output of the voltage comparator LM393 is at a low level; at this time, the system control module 2 controls the power amplification module 4 to switch to the bridge mode, and controls the output voltage of the numerical control power supply module 3 to rise to the first working voltage according to the feedback signal. The specific circuit thereof can be shown in fig. 3; the magnitude of the power signal and the reference voltage can be obtained through the voltage comparison result of the reverse input end A and the forward input end B, so that the power signal is judged to be an external alternating current power supply or a battery power supply, and the judgment result is accessed into the system control module 2 through the point C. Voltage comparator LM393 is the voltage comparison of dual-channel, can also further expand other voltage comparison functions.
In the output feedback module and the power detection module shown in fig. 2 and fig. 3, if R1 is 9.1K, R2 is 1K, and C1 is 100 μ F, the linear optocoupler is LCR0202, and when the battery supplies power, the output power of the power amplification module 4 may be only 1/16 of the output power of the external ac power supply, so that the cruising ability of the battery is greatly prolonged, and the playing time of the battery power supply is increased; when the circuit is externally connected with an alternating current power supply, the output power of the circuit can be adjusted to be 16 times of the power supply power of the battery. Of course, according to factors such as the selection of specific parameters in the circuit, the chip selection of the numerical control power module 3, and the design of the power amplification module 4, the output power multiple of the middle battery power supply and the external ac power supply of the present invention can be designed to be other multiple relationships, and is not limited to 16 times as described in this example.
As shown in fig. 4, the power amplification module may include a first power amplification unit 41 and a second power amplification unit 42 to amplify the multi-channel audio respectively, and an output control unit 43 capable of controlling bridging of the first power amplification unit 41 and the second power amplification unit 42, so that when the input power type is an external ac power, the first power amplification unit 41 and the second power amplification unit 42 are adjusted to a bridging mode to increase the output power of the power amplification module 4.
The utility model discloses a control circuit work flow can be as shown in fig. 5, include following step:
s10: the power supply detection module 1 detects the type of an input power supply and sends a detection signal to the system control module 2; the input power type comprises an external alternating current power supply and a battery power supply;
s20: the system control module 2 judges the type of the input power supply as an external alternating current power supply according to the detection signal and controls the power amplification module 4 to work in a bridging mode;
s30: the output feedback module 5 detects the level of the output signal and sends a feedback signal to the system control module 2;
s40: when the system control module 2 judges that the feedback signal is greater than the set value, the numerical control power supply module 3 is controlled to gradually increase the working voltage of the power amplification module 4 to a preset first working voltage.
The external AC power supply can be a civil 220V AC power supply or a 110V AC power supply, and can also be a large-capacity AC storage battery power supply. When the power detection module 1 judges that the input power type is an external alternating current power supply, the system control module 2 judges that the power amplification module 4 can work at a larger working voltage so as to improve the power amplification effect of the audio frequency; therefore, the system control module 2 outputs a power amplifier control signal to the power amplification module 4, so that the power amplification module 4 operates in the bridge mode. The bridge connection mode of the power amplification module is to output the amplification circuits of the two audio channels to a group of loudspeakers simultaneously so as to improve the audio undistorted output voltage value of the power amplifier and improve the power amplifier power.
When the power amplification module 4 works in the bridge connection mode, the output feedback module 5 detects the output signal level of the power amplification module 4 in real time so as to monitor the output power of the power amplification module 4 and send a feedback signal to the system control module 2; the system control module 2 continuously judges whether the feedback signal is greater than a set value, if so, the output power of the power amplifying circuit is larger, and the output voltage of the numerical control power supply module 3 can be further improved so as to ensure the working voltage of the power amplifying module 4; therefore, the system control module 2 outputs a power control signal to the numerical control power module 3, so that the output voltage of the numerical control power module 3 is gradually increased. The higher the output voltage of the numerical control power supply module 3 is, the higher the output power of the power amplification module 4 is, and the higher the output signal level detected by the output feedback module 5 is; when the numerical control power supply module 3 is judged to reach the preset maximum output voltage, the output voltage can be stopped to be increased, and the working voltage of the power amplification module 4 is kept to be the preset first working voltage, so that the power amplification module 4 outputs a stable high-power amplification signal, and the amplification effect of the audio power is improved.
The set value of the feedback signal can be set according to the actual circuit parameters of the power amplification module 4, can also be set according to the parameters of the numerical control power supply module 3, such as the rated voltage, and can also be selected by combining the setting of the output feedback module 5. The preset first working voltage may be a maximum output voltage value of the numerical control power module 3, or a voltage value lower than the maximum output voltage value, so as to prolong the service life of the numerical control power module 3.
In another embodiment of the present invention, when the system control module 2 determines that the input power type is the battery power according to the detection signal, the controllable power amplification module 4 works in the single power amplifier mode to save power consumption of the power amplification module to the maximum extent, and the output voltage of the numerical control power module 3 (i.e. the working voltage of the power amplification module 4) can be preset to be the fourth working voltage. Of course, the working voltage or the working current of the power amplifier in the power amplification module 4 may also be reduced to reduce the power consumption of each power amplifier, thereby reducing the overall power consumption of the power amplification module 4.
In order to ensure the continuous playing of the audio, the input power types can be switched. When the input power supply is switched from a battery power supply to an external alternating current power supply, the output voltage of the numerical control power supply module 3 can be gradually increased so as to improve the working voltage of the power amplification module and improve the power amplification effect; at the same time, the battery power supply can be charged. When the system control module 2 judges that the type of the input power supply is changed from an external alternating current power supply to a battery power supply according to the detection signal, the power consumption of the power amplification module 4 needs to be reduced as soon as possible, and the battery power supply is prevented from being exhausted in a short time; simultaneously for the sudden change of compromise audio frequency audio, the utility model provides a system control module 2 will control numerical control power module 3 gradually reduces the operating voltage of power amplification module 4 to reduce the output of power amplification module gradually.
In another embodiment of the present invention, the controlling the digital control power module 3 to gradually reduce the operating voltage of the power amplification module 4 specifically includes the following two steps:
gradually reducing the current working voltage to a preset second working voltage;
the power amplification module 4 is controlled to switch from the bridge mode to the single power amplifier mode.
In the first embodiment of the present invention, when the input power type is the external ac power, the power amplification module 4 operates in the bridge mode, and the digital control power module 3 sets the operating voltage of the power amplification module 4 to the preset first operating voltage; if the current working voltage is the first working voltage and the input power type is switched to the battery power, the numerical control power module 3 outputs a fourth working voltage, and at this time, the working voltage of the power amplification module 4 is reduced from the first working voltage to the fourth working voltage. In order to avoid the sudden change of the sound effect caused by the sudden change of the voltage, the present embodiment gradually reduces the current working voltage to the preset second working voltage, and then switches the power amplification module 4 working in the bridge mode to the single power amplifier mode, thereby realizing the gradual transition of the sound effect and avoiding the excessive instantaneous discharge of the battery power supply. The second working voltage may be greater than the fourth working voltage, and after the power amplification module 4 is switched to the single power amplifier mode, the output voltage of the numerical control power supply module 3 may be gradually reduced again until the fourth working voltage, and the fourth working voltage is maintained to supply power continuously.
When system control module 2 judges that the input power type is external AC power supply, and the feedback signal of 5 feedbacks of output feedback module is less than the setting value, explains that power amplifier circuit's output is less, need not to improve numerical control power module 3's output voltage to first operating voltage, so the utility model discloses still provide an embodiment, it is shown with reference to fig. 2: and controlling the numerical control power supply module 3 to set the working voltage of the power amplification module 4 as a third working voltage. The third working voltage is a setting voltage which is supplied by an external ac power supply and at which the power amplification module 4 works in the bridge mode, and may be greater than the fourth working voltage, less than the first working voltage, or greater than or equal to the second working voltage, and preferably may be half of the first working voltage.
Preferably, the utility model discloses still provide the work flow that fig. 6 shows, specifically include following step:
s10: the power supply detection module detects the type of an input power supply;
s20: the system control module judges whether the input power type is an external alternating current power supply, if so, S31 is executed, and if not, S32 is executed;
s31: the power amplification module operates in the bridge mode, and continues to step S40;
s32: setting the power amplification module to a single power amplifier mode;
s40: the system control module judges whether the feedback signal is larger than a set value, if so, S51 is executed, and if not, S52 is executed;
s51: the numerical control power supply module gradually increases the working voltage of the power amplification module to a preset first working voltage;
s52: and the numerical control power supply module outputs a third working voltage.
The working process can detect the type of an input power supply through the power supply detection module 1, so that the output voltage of the numerical control power supply module 3 is controlled through the system control module 2, and therefore the whole circuit outputs smaller power amplification power in a battery power supply mode, and the endurance time of a battery is prolonged; when an external alternating current power supply supplies power, the power amplification module 4 can be set to be in a bridge connection mode to improve the power amplification power, and whether the output voltage of the numerical control power supply module 3 needs to be further improved or not is judged according to the output level signal of the power amplification module 4, so that the power amplification power is further improved, and the power amplification effect is enhanced.
In another embodiment of the present invention, the control circuit may further include an audio signal processing module 6 for receiving an audio signal, an output end of the audio signal processing module 6 is connected to an input end of the power amplifying module 4 to amplify the received audio signal and play the audio signal through the speaker system 7. The power amplification module 4 may further include a circuit protection unit 44 for protecting the circuit from overload or short circuit to automatically turn off the power amplification module 4 when an abnormality occurs in the circuit.
For making the multiple input audio of control circuit adaptation, the utility model discloses a control circuit still switches module 8 including the input that is used for switching multichannel input audio, input switch module 8's output with audio signal processing module 6's input is connected. The input switching module 8 may include an analog input unit 81 for receiving an external analog audio signal, a coaxial/optical fiber input unit 82 for receiving a coaxial or optical fiber audio signal, a bluetooth/WIFI input unit 83 for receiving a bluetooth or WIFI audio signal, an intelligent voice input unit 84 for receiving an external voice input, and the like.
The control circuit of the present invention may further include a battery module 12 for providing a battery power supply to the system control module 2, and a charging module 11 for charging the battery module 12; the charging module 11 is further connected with an alternating current-direct current conversion module 13 and is connected with the system control module 2 through the power supply detection module 1. When the utility model discloses a during the external alternating current power supply of control circuit, can charge to battery module 12 to when losing external alternating current power supply, directly supply power to system control module 2 by battery module 12. The system control module 2 may also be connected with a power indication module 91 for indicating the input power type and an audio signal indication module 92 for prompting the audio input source.
The utility model discloses a control circuit, the utility model discloses still provide an audio equipment, it includes aforementioned arbitrary one control circuit.
The utility model can bridge the power amplifying unit in the power amplifying module 4 to improve the output power of the power amplifying module 4, and can also improve the output voltage through the numerical control power module 3, and can also combine the two to change the output power; and simultaneously, the utility model discloses still through the state of power detection module 1 and output feedback module 5 real-time detection input power type and power amplification module 4's output level to but according to testing result automatic control change output.
When the battery is powered by the control circuit of the utility model, the output power of the power amplification module is only 1/16 of the maximum power, thus greatly prolonging the endurance of the battery and increasing the playing time of the battery power supply; when external AC power supply, the utility model discloses a control circuit exports 16 times the power of battery powered to provide powerful power amplifier effect, continuous broadcast time when having compromise battery powered well and the power amplifier audio when external power supply.
The foregoing is only a partial embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A circuit for controlling audio power, comprising:
the power supply detection module is used for detecting the type of an input power supply and sending a detection signal to the system control module, wherein the type of the input power supply comprises an external alternating current power supply and a battery power supply; the system control module is used for outputting a power amplifier control signal and a power supply control signal according to the detection signal and the feedback signal; the numerical control power supply module is used for outputting power amplifier voltage according to the power supply control signal; the power amplification module is used for adjusting the power amplification mode to a bridge connection mode according to the power amplification control signal; and the output feedback module is used for detecting the output signal level of the power amplification module and sending a feedback signal to the system control module.
2. The control circuit of claim 1, wherein the output feedback module comprises:
a voltage dividing unit for attenuating the voltage output from the power amplifying module to output a divided voltage signal, an
And the coupling unit is used for coupling the divided voltage signal into a monitoring signal matched with the voltage range of the input interface of the system control module.
3. The control circuit of claim 1, wherein the output feedback module comprises resistors R1, R2, R3, R4, R5, R6, R7, capacitors C1, C2, C3, C4, an NPN transistor Q1, a PNP transistor Q2, and a linear optocoupler; one end of R1 is connected with the output signal level end, the other end is connected with one end of R2 and the anode of C1, the cathode of C1 is connected with the cathode of C2, the anode of C2 is connected with one end of R3 and R4, the other end of R3 is connected with one end of R5, the anode of R6 and the anode of R7 and the feedback voltage output end of the digital control power module, the other end of R5 is connected with the collector of Q1, the base of Q1 is connected with the anode of C1, the emitter of Q1 is connected with the input power end of the linear optical coupler, the input reference end and the output reference end of the linear optical coupler are connected with the other ends of R1 and grounded, the output power end of the linear optical coupler is connected with the other end of R1 and the base of Q1, the collector of Q1 is grounded, the emitter of Q1 is connected with the other end of R1, one end of C1 and the.
4. The control circuit of claim 3, wherein the linear optical coupler is LCR 0202.
5. The control circuit according to claim 1, wherein the power detection module comprises a voltage comparator LM393, and the power signal and the reference voltage are respectively connected to the inverting input terminal and the forward input terminal of the same channel, and the output terminal of the channel is connected to the system control module.
6. The control circuit of claim 1, wherein the power amplification module comprises a first power amplification unit, a second power amplification unit, and an output control unit capable of controlling the bridging of the first power amplification unit and the second power amplification unit.
7. The control circuit of claim 1, further comprising an audio signal processing module for receiving an audio signal, an output of the audio signal processing module being connected to an input of the power amplification module.
8. The control circuit of claim 7, further comprising an input switching module for switching multiple input audios, wherein an output terminal of the input switching module is connected to an input terminal of the audio signal processing module.
9. The control circuit of claim 1, further comprising a battery module for providing battery power to a system control module, a charging module for charging the battery module; the charging module is also connected with an alternating current-direct current conversion module and is connected with the system control module through the power supply detection module.
10. Audio device, characterized in that it comprises a control circuit according to any of claims 1-9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721498677.8U CN207475843U (en) | 2017-11-09 | 2017-11-09 | The control circuit and audio frequency apparatus of audio power |
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| CN201721498677.8U CN207475843U (en) | 2017-11-09 | 2017-11-09 | The control circuit and audio frequency apparatus of audio power |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107864435A (en) * | 2017-11-09 | 2018-03-30 | 广州艾美网络科技有限公司 | Control method, control circuit and the audio frequency apparatus of audio power |
| CN111885462A (en) * | 2020-07-17 | 2020-11-03 | 上海艾为电子技术股份有限公司 | Audio power amplifier circuit, power amplifier mode control method thereof and electronic equipment |
-
2017
- 2017-11-09 CN CN201721498677.8U patent/CN207475843U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107864435A (en) * | 2017-11-09 | 2018-03-30 | 广州艾美网络科技有限公司 | Control method, control circuit and the audio frequency apparatus of audio power |
| CN107864435B (en) * | 2017-11-09 | 2024-03-15 | 广州艾美网络科技有限公司 | Audio power control method, control circuit and audio equipment |
| CN111885462A (en) * | 2020-07-17 | 2020-11-03 | 上海艾为电子技术股份有限公司 | Audio power amplifier circuit, power amplifier mode control method thereof and electronic equipment |
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