CN113766700A - All-in-one light emitting diode dimming circuit - Google Patents
All-in-one light emitting diode dimming circuit Download PDFInfo
- Publication number
- CN113766700A CN113766700A CN202111045827.0A CN202111045827A CN113766700A CN 113766700 A CN113766700 A CN 113766700A CN 202111045827 A CN202111045827 A CN 202111045827A CN 113766700 A CN113766700 A CN 113766700A
- Authority
- CN
- China
- Prior art keywords
- dimming
- signal
- processor
- pulse width
- unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000009467 reduction Effects 0.000 claims abstract description 8
- 238000001514 detection method Methods 0.000 claims description 17
- 239000003990 capacitor Substances 0.000 description 33
- 241001465382 Physalis alkekengi Species 0.000 description 4
- 230000006978 adaptation Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000007 visual effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/32—Pulse-control circuits
- H05B45/325—Pulse-width modulation [PWM]
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention provides an all-in-one light emitting diode dimming circuit, which comprises: the first dimming receiving module is used for carrying out voltage reduction processing on a first dimming signal to obtain a level signal; the second dimming receiving module is used for acquiring a second dimming signal from an upper computer and outputting the second dimming signal in a mode of changing a rated high level and a rated low level; the dimming processor is used for converting the first dimming signal into a first pulse width modulation signal and outputting the first dimming signal, and converting the second dimming signal into a second pulse width modulation signal; the driving power supply module receives the first pulse width modulation signal or the second pulse width modulation signal to output a dimming signal, and then controls the lamp load to realize dimming. The dimming circuit has the advantages that the first dimming signal is converted into the first pulse width modulation signal, the second dimming signal is converted into the second pulse width modulation signal, so that dimming operation is performed on the lamp load, and the compatibility of the dimming circuit is improved.
Description
Technical Field
The invention relates to the technical field of light emitting diode driving, in particular to an all-in-one light emitting diode dimming circuit.
Background
Currently, most light emitting diode-based lamps provide dimming functions to meet different lighting needs of users. The light adjusting method mainly includes conventional dimming and secondary dimming, and the conventional dimming includes 0/1-10V dimming, resistance dimming and pulse width modulation dimming. No matter which kind of mode of adjusting luminance all needs the corresponding drive power supply and the lamps and lanterns load of assembly with the dimmer adaptation, and the user can't control the lamps and lanterns that adopt traditional mode of adjusting luminance through the second signal of adjusting luminance and adjust luminance, also can't control the lamps and lanterns that adopt the second mode of adjusting luminance through first signal of adjusting luminance in the same way, has the defect that lamps and lanterns suitability is not strong, and the compatibility is not high.
In addition, the driving power supply applied to the lamp with dimming function includes a constant current power supply and a constant voltage power supply, and the dimming signal generated by the dimmer is often only applicable to the constant current driving power supply or the constant voltage driving power supply, which has the defect of low adaptation degree of the dimmer.
Disclosure of Invention
To solve the problems in the prior art, the present invention provides an all-in-one light emitting diode dimming circuit, comprising:
the first dimming receiving module is used for acquiring a first dimming signal and performing voltage reduction processing on the first dimming signal to obtain a level signal;
the second receiving module of adjusting luminance connects a host computer, includes:
the acquisition unit is used for acquiring a second dimming signal according to the upper computer;
the processing unit is connected with the acquisition unit and used for outputting the second dimming signal in a mode of changing a rated high level and a rated low level;
the dimming processor is respectively connected with the first dimming receiving module and the second dimming receiving module, and is used for converting the first dimming signal into a corresponding first pulse width modulation signal and outputting the first dimming signal when receiving the first dimming signal, and calculating and converting the second dimming signal to obtain a corresponding second pulse width modulation signal when receiving the second dimming signal;
the switch module outputs the switching signal of low level when being conducted, and the dimming processor is correspondingly switched to a second dimming mode; when the switch module is not conducted, the switch module outputs the switching signal with high level, and then the dimming processor is switched to a first dimming mode;
the communication module is respectively connected with the second dimming receiving module and the dimming processor and is used for sending the second dimming signal to the dimming processor;
and the driving power supply module is respectively connected with the dimming processor and a lamp load and is used for receiving the first pulse width modulation signal or the second pulse width modulation signal to output a dimming signal so as to control the lamp load to realize dimming.
Preferably, the dimming processor includes:
a switching unit for switching to a first dimming mode or a second dimming mode according to a switching signal,
the first analysis unit is connected with the switching unit and used for receiving the first dimming signal and analyzing the first dimming signal to obtain a corresponding first pulse width modulation signal when the analysis unit is switched to the first dimming mode;
and the second analysis unit is connected with the switching unit and used for receiving the second dimming signal when the analysis unit is switched to the second dimming mode, converting the second dimming signal into a dimming value, and calculating to obtain the corresponding second pulse width modulation signal according to the dimming value.
Preferably, the first analysis unit presets a dimming parameter table, the first dimming signal corresponds to a duty ratio in the dimming parameter table, and the first analysis unit generates and outputs the corresponding first pwm signal according to the duty ratio.
Preferably, the lighting control system further comprises a detection module, which is respectively connected to the driving power module and the dimming processor, and is configured to process a driving signal output by the driving power module to obtain a feedback signal, and the dimming processor outputs an alarm signal when the feedback signal is not less than a preset feedback threshold value to prompt that the lamp load is in a fault state.
Preferably, the communication module includes:
the first communication unit is used for sending the second dimming signal acquired by the acquisition unit to the dimming processor;
and the second communication unit is used for controlling the acquisition unit to stop receiving the second dimming signal according to the feedback signal.
Preferably, the first dimming signal includes: 0/1-10V dimming signal, resistance adjustment signal and pulse width modulation signal.
Preferably, the first dimming receiving module comprises an energy supply unit, the energy supply unit is connected with a dimmer, and the energy supply unit is used for supplying electric energy to the dimmer and driving the dimmer to output the first dimming signal.
Preferably, the switch module is a dial switch, and a user manually controls the dial switch to be switched on or off.
The technical scheme has the following advantages or beneficial effects:
(1) the dimming processor receives the first dimming signal and the second dimming signal respectively, the dimming processor automatically identifies the input first dimming signal and the input second dimming signal, converts the first dimming signal into a first pulse width modulation signal and converts the second dimming signal into a second pulse width modulation signal respectively, and the driving power supply dims the lamp load according to the converted first pulse width modulation signal or the converted second pulse width modulation signal, so that the compatibility of the lamp to different dimming signals is improved.
(2) The first pulse width modulation signal and the second pulse width modulation signal output by the light modulation processor are both suitable for a constant voltage driving power supply and a constant current driving power supply, and the light modulation processor enables the change rate of output current to be constant through a pulse width modulation generation algorithm aiming at the constant current driving power supply, so that on one hand, the lighting effect of the lamp accords with the visual characteristic of human eyes, and the experience of a user when the user uses the lamp is improved; on the other hand, the adaptation degree of the light modulator and the constant voltage driving power supply and the adaptation degree of the light modulator and the constant current driving power supply are improved.
Drawings
FIG. 1 is a schematic diagram of an all-in-one LED dimming circuit according to a preferred embodiment of the present invention;
FIG. 2 is a graph of a dimming curve of a first dimming signal according to a preferred embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of a first dimming receiving circuit according to a preferred embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of a second dimming receiving circuit according to a preferred embodiment of the present invention;
FIG. 5 is a schematic circuit diagram of the dimming processor and peripheral circuits in accordance with the preferred embodiment of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present invention is not limited to the embodiment, and other embodiments may be included in the scope of the present invention as long as the gist of the present invention is satisfied.
In a preferred embodiment of the present invention, based on the above problems in the prior art, an all-in-one led dimming circuit is provided, as shown in fig. 1 to 5, including:
the first dimming receiving module 1 is used for acquiring a first dimming signal and performing voltage reduction processing on the first dimming signal to obtain a level signal;
the second receiving module 2 of adjusting luminance connects a host computer 3, includes:
the acquisition unit 21 is used for acquiring a second dimming signal according to the upper computer 3;
the processing unit 22 is connected with the acquisition unit 21 and is used for outputting the second dimming signal in a mode of changing a rated high level and a rated low level;
the dimming processor 4 is respectively connected with the first dimming receiving module 1 and the second dimming receiving module 2, and is used for converting the first dimming signal into a corresponding first pulse width modulation signal and outputting the first dimming signal when receiving the first dimming signal, and the dimming processor 4 calculates and converts the second dimming signal to obtain a corresponding second pulse width modulation signal when receiving the second dimming signal;
the switch module 8 outputs a low-level switching signal when the switch module 8 is switched on, and the dimming processor 4 is correspondingly switched to a second dimming mode; when the switch module 8 is not turned on, a high-level switching signal is output, and the dimming processor 4 is switched to a first dimming mode;
the communication module 5 is respectively connected with the second dimming receiving module 2 and the dimming processor 4, and is used for sending the second dimming signal to the dimming processor 4;
and the driving power supply module 6 is respectively connected with the dimming processor 4 and a lamp load 7 and is used for receiving the first pulse width modulation signal or the second pulse width modulation signal to output a dimming signal so as to control the lamp load 7 to realize dimming.
In a preferred embodiment of the present invention, the first dimming signal comprises: 0/1-10V dimming signal, resistance adjustment signal and pulse width modulation signal.
Specifically, in the present embodiment, the first dimming signal received by the first dimming receiving module 1 includes 0/1-10V dimming signal, resistance dimming signal, and pulse width modulation dimming signal; the second dimming receiving module 2 receives a second dimming signal sent by the upper computer 3.
Because the high level range that the second light modulation signal that host computer 3 sent corresponds: 9.5V-22.5V, low level range: 6.5V-6.5V, the dimming processor 4 cannot directly identify the second dimming signal, and the level value in the high level range is converted into a rated high level and the level value in the low level range is converted into a rated low level through the second dimming receiving module 2, so that the dimming processor 4 can identify the second dimming signal and output a corresponding second pulse width modulation signal according to the second dimming signal.
When the dimming processor 4 receives the level signal, outputting a corresponding first pulse width modulation signal according to the level signal, and controlling the driving power module 6 to drive the lamp load 7 to dim light through the first pulse width modulation signal; when the dimming processor 4 receives the second dimming signal, the corresponding second pulse width modulation signal is output according to the second dimming signal, and the driving power module 6 is controlled by the second pulse width modulation signal to drive the lamp load 7 to perform dimming.
In the preferred embodiment of the present invention, the first dimming receiving module 1 includes an energy supplying unit 11, the energy supplying unit 11 is connected to a dimmer 12, the energy supplying unit 11 is configured to supply power to the dimmer 12, and the dimmer 12 is driven to output the first dimming signal.
Specifically, in the present embodiment, the first dimming receiving module 1 includes a first power supply circuit for supplying power to the dimming processor 4, a second power supply circuit for supplying power to the dimmer 12, a reference circuit for generating a reference signal, and a voltage step-down circuit for step-down the first dimming signal to generate a level signal, and the second power supply circuit is the power supply unit 11. The dimmer 12 is a variety of dimmers 12 for generating 0/1-10V dimming signals, resistance dimming signals, and pulse width modulation dimming signals, respectively.
The first power supply circuit comprises a chip U2, a capacitor C4 and a capacitor C1, wherein the chip U2 is H6900 in type selection.
The reference circuit comprises a three-terminal regulator tube U3, a resistor R10 and a capacitor C7.
The input end of the three-terminal regulator tube U3 is connected with one end of the resistor R10, the other end of the resistor R10 is connected with a node between a pin 1 of the chip U2 and the capacitor C1, the ground end of the three-terminal regulator tube U3 is grounded, and the output end of the three-terminal regulator tube is respectively connected with one end of the capacitor C7 and the reference voltage input end of the second power supply circuit.
The second power supply circuit includes a voltage comparator U1B, a resistor R12, a resistor R13, a resistor R14, a resistor R15, and a resistor R16.
The 5 pins of the voltage comparator U1B are connected to one end of a resistor R12 and one end of a resistor R15, respectively, the other end of the resistor R12 is connected to the output end of the reference circuit, the other end of the resistor R15 is connected to the input ends of a resistor R16 and a voltage reduction circuit, the 6 pins of the voltage comparator U1B are connected to one end of a resistor R13 and one end of a resistor R14, the other end of the resistor R13 is grounded, and the other end of the resistor R14 is connected to the 7 pin of the voltage comparator U1B and the other end of the resistor R16, respectively.
The voltage reduction circuit comprises a voltage stabilizing diode D2, a resistor R9, a capacitor C6, an operational amplifier U1A, a diode D1, a resistor R6, a resistor R7, a capacitor C3 and a capacitor C2.
The pin 1 of the operational amplifier U1A is connected to the anode of the diode D1, the cathode of the diode D1 is connected to the pin 2 of the operational amplifier U1A and one end of the resistor R6, respectively, the other end of the resistor R6 is connected to one end of the resistor R7, one end of the capacitor C3 and the signal input end of the first analyzing unit 42 in the dimming processor 4, respectively, the other end of the resistor R7 is grounded, the other end of the capacitor C3 is grounded, the pin 3 of the operational amplifier U1A is connected to one end of the capacitor C6, one end of the resistor R9 and the other end of the capacitor C6 are grounded, the other end of the resistor R9 is connected with the cathode of the zener diode D2 and the node between the resistor R16 and the resistor R15, the pin 4 of the operational amplifier U1A is grounded, the pin 8 of the operational amplifier U1A is connected with the 12V direct current and one end of the capacitor C2, and the other end of the capacitor C2 is grounded.
The first dimming receiving circuit further includes a capacitor C5 and a resistor R8, one end of the capacitor C5 is connected to the output terminal of the dimmer 12 and one end of the resistor R8, respectively, the other end of the resistor R8 is connected to a node between the resistor R16 and the resistor R15, and the other end of the capacitor C5 is grounded.
When the all-in-one light emitting diode dimming circuit is applied to the dimming of the first dimming signal control lamp load 7: the dimmer 12 outputs a first dimming signal under the driving of the second power module, the first power module outputs a first power signal of 5V and a reference signal of 2.5V respectively, the voltage reduction circuit compares the reference signal with the first dimming signal of 0-10V, the first dimming signal is converted into a 0-5V level signal which is approximately linear after voltage reduction processing, and the level signal is output to the dimming processor 4, and the first power signal output by the first power module is used for supplying energy to the dimming processor 4.
In the preferred embodiment of the present invention, the switch module 8 includes a dial switch, and a user manually controls the dial switch to be turned on or off.
Specifically, in the present embodiment, the switch module 8 includes a switch S1 and a resistor R19, wherein the switch S1 is a dial switch.
One end of the switch S1 is grounded, the other end of the switch S1 is connected to the input end of the switching signal corresponding to the dimming processor 4 and one end of the resistor R19, and the other end of the resistor R19 is connected to the first power supply signal of 5V.
When the switch S1 is closed, the switch module 8 is turned on, and the dimming processor 4 receives the low-level switching signal to switch to the second dimming mode; when the switch S1 is turned off, the switch module 8 is not turned on, and the dimming processor 4 receives a high-level switching signal to switch to the conventional dimming mode.
In the preferred embodiment of the present invention, the dimming processor 4 includes:
a switching unit 41 for switching to a first dimming mode or a second dimming mode according to a switching signal,
the first analyzing unit 42 is connected to the switching unit 41, and is configured to receive the first dimming signal and analyze the first dimming signal to obtain a corresponding first pwm signal when the analyzing unit is switched to the first dimming mode;
the second analyzing unit 43 is connected to the switching unit 41, and configured to receive the second dimming signal when the analyzing unit is switched to the second dimming mode, convert the second dimming signal into a dimming value, and calculate a corresponding second pwm signal according to the dimming value.
Specifically, in the present embodiment, the dimming processor 4 is a chip U4, and the chip U4 is AD 9834.
In a preferred embodiment of the present invention, the lighting device further includes a detection module 9, respectively connected to the driving power module 6 and the dimming processing module, for processing a driving signal output by the driving power module 6 to obtain a feedback signal, and the dimming processing module outputs an alarm signal to prompt the lamp load 7 to be in a fault state when the feedback signal is not less than a preset feedback threshold.
Specifically, in this embodiment, the detection module 9 includes a load detection circuit and an overload detection circuit. The load detection circuit respectively acquires the driving signals output by the driving power supply module 6, converts the driving signals into corresponding feedback signals, returns the feedback signals to the dimming processor 4, and judges whether the lamp load 7 has a fault or not according to the level of the feedback signals by the dimming processor 4.
The feedback signal corresponding to the load detection circuit is a load signal, and the feedback signal corresponding to the overload detection circuit is an overload signal.
The load detection circuit comprises a voltage comparator U5A, a resistor R93, a resistor R125, a resistor R128, a resistor R129 and a capacitor C73.
After passing through the resistor R129, the first power signal is converted from a current signal into a reference voltage and is input to the inverting terminal of the voltage comparator U5A, the driving signal output by the driving power module 6 is input to the non-inverting terminal of the voltage comparator U5A, and when the voltage value of the driving signal is lower than the reference voltage value, the output terminal of the voltage comparator U5A outputs a low-level on-load signal; conversely, when the voltage value of the driving signal is higher than the reference voltage value, the on-load signal is at a high level, and the chip U4 prompts the user that the lamp load 7 is in a fault when the on-load signal is at a low level.
The overload detection circuit includes a voltage comparator U5B, a resistor R92, a resistor R121, a resistor R122, a resistor R124, a diode D40, a capacitor C71, and a capacitor C72.
The 5 pins of the voltage comparator U5B are connected to the driving signal, the 6 pins of the voltage comparator U5B are respectively connected to one end of the resistor R121 and one end of the resistor R122, the other end of the resistor R121 is grounded, the other end of the resistor R122 is respectively connected to the first power signal and one end of the resistor R92, the 7 pins of the voltage comparator U5B are respectively connected to the anode of the diode D40 and the other end of the resistor R92, the cathode of the diode D40 is respectively connected to one end of the resistor R124 and one end of the capacitor C71, the other end of the resistor R124 is respectively connected to one end of the capacitor C72 and the input end of the chip U4 for obtaining the overload signal, i.e., the 12 pins of the chip U4, the other end of the capacitor C71 is grounded, and the other end of the capacitor C72 is grounded.
After a first power supply signal passes through the resistor R122, a current signal is converted into a reference voltage and is input to the reverse end of the voltage comparator U5B, a driving signal output by the driving power supply module 6 is input to the in-phase end of the voltage comparator U5B, when a voltage value corresponding to a voltage signal output by the output end of the voltage comparator U5B is greater than the conduction voltage of the diode D40, the diode D40 is broken down and conducted, and the overload detection circuit outputs a high-level overload signal; on the contrary, when the voltage value corresponding to the voltage signal output by the output terminal of the voltage comparator U5B is not greater than the conduction voltage of the diode D40, the diode D40 is not conducted, the overload signal output by the overload detection circuit is at a low level, and the chip U4 prompts the user that the lamp load 7 has an overload risk when the overload signal is at a high level.
In summary, the feedback threshold includes a current threshold corresponding to the on-load detection circuit and a current threshold corresponding to the overload detection circuit, where the current threshold corresponding to the on-load detection circuit is 330mA, and when the current of the driving signal is lower than 330mA, it is determined that there is no-load fault; the current threshold corresponding to the overload detection circuit is 50A, and when the current of the driving signal is higher than 50A, the short-circuit fault is determined.
In a preferred embodiment of the present invention, the communication module 5 includes:
the first communication unit 51 is configured to send the second dimming signal acquired by the acquisition unit 21 to the dimming processor 4;
and a second communication unit 52, configured to control the acquisition unit 21 to stop receiving the second dimming signal according to the feedback signal.
Specifically, in the present embodiment, the communication module 5 is configured to provide a communication channel for the dimming processor 4 and the second dimming receiving module 2, and the second dimming receiving module 2 includes an acquisition unit 21, a processing unit 22, and a clamping unit configured to drive the acquisition unit 21 to stop acquiring the second dimming receiving module 2.
The input end of the first communication unit 51 is connected to the output end of the processing circuit, the output end of the first communication unit 51 is connected to the input end of the chip U4 for obtaining the second dimming signal, the input end of the second communication unit 52 is connected to the output end of the chip U4 for outputting a stop signal, and the output end of the second communication unit 52 is connected to the input end of the clamping unit.
The first communication unit 51 includes a light emitting diode P2A and a phototransistor P2B.
The second communication unit 52 includes a resistor R107, a light emitting diode P1A, a resistor R102, and a photo transistor P1B.
The anode of the light emitting diode P2A is connected to the output end of the processing unit 22, the cathode of the light emitting diode P2A is connected to the cathode of the zener diode D20, one end of the capacitor C45, and the anode of the zener diode D49, the anode of the zener diode D20, and the other end of the capacitor C45 are all grounded, the cathode of the zener diode D49 is connected to one end of the resistor R84 and one end of the capacitor C43, the other end of the capacitor C43 is grounded, the other end of the resistor R84 is connected to the collector of the phototransistor P1B, the emitter of the phototransistor P1B is connected to the input end of the clamping unit and one end of the resistor R76, the anode of the light emitting diode P1A is connected to the node of the resistor R102 and the first power signal, the other end of the resistor R102 is connected to the pin 16 of the chip U4 and the collector of the phototransistor P2B, the cathode of the light emitting diode P1A is connected to one end of the resistor R107, and the other end of the chip U4 is connected to the pin 15 of the chip U4, the emitter of the phototransistor P2B is grounded.
The acquisition unit 21 includes a rectifier bridge BD1, pin 1 of the rectifier bridge BD1 is connected to one end of the capacitor C35, the input end of the processing unit 22, and the output end of the clamping unit, pin 2 of the rectifier bridge BD1 is connected to the positive electrode of the second dimming signal, pin 3 of the rectifier bridge BD1 is connected to the negative electrode of the second dimming signal, and pin 4 of the rectifier bridge BD1 is grounded.
When the second dimming signal is acquired, the diode between the pin 2 and the pin 1 of the rectifier bridge BD1 is conducted in the forward direction, and the diode between the pin 3 and the pin 1 is conducted in the forward direction; when the second dimming signal is stopped being obtained, the output end of the clamping unit inputs a high level, so that the diode between the pin 2 and the pin 1 of the rectifier bridge BD1 is cut off, and the diode between the pin 3 and the pin 1 is cut off.
The processing unit 22 includes a resistor R75, a transistor Q14, a transistor Q15, and a resistor R28.
One end of the resistor R75 is connected to pin 1 of the rectifier bridge BD1, the drain of the MOS transistor Q12 and the emitter of the transistor Q14, the other end of the resistor R75 is connected to the base of the transistor Q14 and the emitter of the transistor Q15, the collector of the transistor Q14 is connected to one end of the resistor R89 and the base of the transistor Q15, the collector of the transistor Q15 is connected to one end of the resistor R28, the other end of the resistor R28 is connected to the anode of the light emitting diode P2A, the other end of the resistor R89 is connected to one end of the resistor R79, the other end of the resistor R79 is connected to one end of the resistor R78, the other end of the resistor R78 is connected to one end of the resistor R77, and the other end of the resistor R77 is grounded.
The clamping unit comprises a MOS transistor Q12, a triode Q13, a resistor R80 and a triode C41.
The gate of the MOS transistor Q12 is connected to one end of the resistor R80 and the emitter of the transistor Q13, respectively, the other end of the resistor R80 is connected to the base of the transistor Q13, one end of the capacitor C41 and the emitter of the phototransistor P1B, respectively, the other end of the capacitor C41 is grounded, the collector of the transistor Q13 is grounded, the source of the MOS transistor Q12 is grounded, and the drain of the MOS transistor Q12 is connected to pin 1 of the rectifier bridge BD 1.
When the chip U4 analyzes the feedback signal and obtains that the lamp load 7 has a short circuit or overload fault, the pin 15 of the chip U4 outputs a stop signal, so that the light emitting diode P1A is turned on, the phototriode P1B receives the stop signal, the source and the drain of the MOS transistor Q12 are turned on, the level of the pin 1 of the rectifier bridge BD1 is raised, the diode between the pin 2 and the pin 1 of the rectifier bridge BD1 is cut off, and the diode between the pin 3 and the pin 1 is cut off, thereby playing a role in stopping obtaining the second dimming signal.
In a preferred embodiment of the present invention, the first analyzing unit 42 is preset with a dimming parameter table, the first dimming signal corresponds to a duty ratio in the dimming parameter table, and the first analyzing unit 42 generates and outputs a corresponding first pwm signal according to the duty ratio.
Specifically, in the present embodiment, the chip U4 generates the corresponding first pwm signal according to the level value of the first dimming signal corresponding to the duty ratio of the dimming parameter table.
By making the dimming curve graph conforming to the visual characteristics of the human eyes, as shown in fig. 2, the abscissa of the dimming curve graph is the actual power level, and the ordinate of the dimming parameter table is the dimming output, so that the change rate of the output current is constant, the lighting effect of the lamp conforms to the visual characteristics of the human eyes, and the experience of a user when the user uses the lamp is improved. Wherein the actual power level is computationally converted from the first dimming signal.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (8)
1. An all-in-one light emitting diode dimming circuit, comprising:
the first dimming receiving module is used for acquiring a first dimming signal and performing voltage reduction processing on the first dimming signal to obtain a level signal;
the second receiving module of adjusting luminance connects a host computer, includes:
the acquisition unit is used for acquiring a second dimming signal according to the upper computer;
the processing unit is connected with the acquisition unit and used for outputting the second dimming signal in a mode of changing a rated high level and a rated low level;
the dimming processor is respectively connected with the first dimming receiving module and the second dimming receiving module, and is used for converting the first dimming signal into a corresponding first pulse width modulation signal and outputting the first dimming signal when receiving the first dimming signal, and calculating and converting the second dimming signal to obtain a corresponding second pulse width modulation signal when receiving the second dimming signal;
the switch module outputs the switching signal of low level when being conducted, and the dimming processor is correspondingly switched to a second dimming mode; when the switch module is not conducted, the switch module outputs the switching signal with high level, and then the dimming processor is switched to a first dimming mode;
the communication module is respectively connected with the second dimming receiving module and the dimming processor and is used for sending the second dimming signal to the dimming processor;
and the driving power supply module is respectively connected with the dimming processor and a lamp load and is used for receiving the first pulse width modulation signal or the second pulse width modulation signal to output a dimming signal so as to control the lamp load to realize dimming.
2. The all-in-one light emitting diode dimming circuit according to claim 1, wherein the dimming processor comprises:
a switching unit for switching to a first dimming mode or a second dimming mode according to a switching signal,
the first analysis unit is connected with the switching unit and used for receiving the first dimming signal and analyzing the first dimming signal to obtain a corresponding first pulse width modulation signal when the analysis unit is switched to the first dimming mode;
and the second analysis unit is connected with the switching unit and used for receiving the second dimming signal when the analysis unit is switched to the second dimming mode, converting the second dimming signal into a dimming value, and calculating to obtain the corresponding second pulse width modulation signal according to the dimming value.
3. The all-in-one light emitting diode dimming circuit according to claim 2, wherein the first analyzing unit is preset with a dimming parameter table, the first dimming signal corresponds to a duty ratio in the dimming parameter table, and the first analyzing unit generates and outputs the corresponding first pwm signal according to the duty ratio.
4. The all-in-one light emitting diode dimming circuit according to claim 1, further comprising a detection module, respectively connected to the driving power module and the dimming processor, for processing a driving signal output by the driving power module to obtain a feedback signal, wherein the dimming processor outputs an alarm signal to prompt the lamp load to be in a fault state when the feedback signal is not less than a preset feedback threshold.
5. The all-in-one light emitting diode dimming circuit according to claim 4, wherein the communication module comprises:
the first communication unit is used for sending the second dimming signal acquired by the acquisition unit to the dimming processor;
and the second communication unit is used for controlling the acquisition unit to stop receiving the second dimming signal according to the feedback signal.
6. The all-in-one light emitting diode dimming circuit according to claim 1, wherein the first dimming signal comprises: 0/1-10V dimming signal, resistance adjustment signal and pulse width modulation signal.
7. The all-in-one light emitting diode dimming circuit according to claim 1, wherein the first dimming receiving module comprises an energy supplying unit, the energy supplying unit is connected to a dimmer, and the energy supplying unit is configured to supply power to the dimmer to drive the dimmer to output the first dimming signal.
8. The all-in-one light emitting diode dimming circuit according to claim 1, wherein the switch module is a dial switch, and a user manually controls the dial switch to be turned on or off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111045827.0A CN113766700A (en) | 2021-09-07 | 2021-09-07 | All-in-one light emitting diode dimming circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111045827.0A CN113766700A (en) | 2021-09-07 | 2021-09-07 | All-in-one light emitting diode dimming circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113766700A true CN113766700A (en) | 2021-12-07 |
Family
ID=78793566
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111045827.0A Pending CN113766700A (en) | 2021-09-07 | 2021-09-07 | All-in-one light emitting diode dimming circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113766700A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090261748A1 (en) * | 2008-04-15 | 2009-10-22 | Mckinney Steven | Modified dimming LED driver |
| CN202713690U (en) * | 2012-04-27 | 2013-01-30 | 企达工业(南京)有限公司 | Dimming interface circuit used for LED drive power |
| CN104470149A (en) * | 2014-12-25 | 2015-03-25 | 东莞卫光电子科技有限公司 | Dimming circuit suitable for multiple dimming modes |
| US20190132921A1 (en) * | 2017-10-31 | 2019-05-02 | Fulham Company Limited | Led dimming using switch mode power supply control loop parameter modification |
| CN112397034A (en) * | 2020-11-02 | 2021-02-23 | 深圳市创维群欣安防科技股份有限公司 | Dimming control circuit and display device |
| CN217445547U (en) * | 2021-09-07 | 2022-09-16 | 宁波赛耐比光电科技有限公司 | All-in-one light emitting diode dimming circuit |
-
2021
- 2021-09-07 CN CN202111045827.0A patent/CN113766700A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090261748A1 (en) * | 2008-04-15 | 2009-10-22 | Mckinney Steven | Modified dimming LED driver |
| CN202713690U (en) * | 2012-04-27 | 2013-01-30 | 企达工业(南京)有限公司 | Dimming interface circuit used for LED drive power |
| CN104470149A (en) * | 2014-12-25 | 2015-03-25 | 东莞卫光电子科技有限公司 | Dimming circuit suitable for multiple dimming modes |
| US20190132921A1 (en) * | 2017-10-31 | 2019-05-02 | Fulham Company Limited | Led dimming using switch mode power supply control loop parameter modification |
| CN112397034A (en) * | 2020-11-02 | 2021-02-23 | 深圳市创维群欣安防科技股份有限公司 | Dimming control circuit and display device |
| CN217445547U (en) * | 2021-09-07 | 2022-09-16 | 宁波赛耐比光电科技有限公司 | All-in-one light emitting diode dimming circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10805994B2 (en) | Method and apparatus for determining a target light intensity from a phase-control signal | |
| US11930574B2 (en) | Drive circuit for a light-emitting diode light source | |
| CN217445547U (en) | All-in-one light emitting diode dimming circuit | |
| US11310878B2 (en) | Dimming control circuit, driving device and control method thereof | |
| CN107592705B (en) | The LED drive circuit and light-dimming method of tunable optical | |
| CN113766700A (en) | All-in-one light emitting diode dimming circuit | |
| CN216362371U (en) | Over-temperature smooth power reduction protection circuit for LED lamp | |
| CN107846756B (en) | LED dimming device | |
| CN105677038A (en) | Gesture recognition control circuit and control method | |
| CN115175399A (en) | Novel silicon controlled constant voltage digital dimming circuit | |
| CN212064456U (en) | Online adjusting circuit of parameter of adjusting luminance | |
| CN212413472U (en) | Dimming LED controller | |
| CN110446295B (en) | Remote-controlled dimmer circuit | |
| CN114679815A (en) | Control circuit capable of changing response speed of feedback loop of LED dimming power supply in real time | |
| CN111405724A (en) | Dimming parameter online adjusting circuit and dimming method | |
| CN210124031U (en) | LED lighting system capable of adaptively adjusting light according to ambient illumination | |
| US20110241561A1 (en) | Method of Controlling an Electronic Dimming Ballast During Low Temperature Conditions | |
| CN210042299U (en) | Trailing edge phase control lamp dimmer | |
| CN114189957A (en) | Device and method for reducing low-brightness jitter of light source and lamp | |
| CN113630937A (en) | Power factor switching circuit, LED lamp driving module and working method thereof | |
| CN217985456U (en) | Radiation-resistant decoder auxiliary lamp light dimming circuit | |
| CN208113026U (en) | Dimmer module is cut after one kind | |
| CN118647117A (en) | Programmable LED power supply control system | |
| CN218603680U (en) | Three-in-one LED dimming driving power supply | |
| CN116528420B (en) | Dimming circuit and dimming method based on single chip microcomputer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Country or region after: China Address after: No. 122315000 Jianlan Road, Gaoxin District, Ningbo, Zhejiang Applicant after: Ningbo sainaibi Photoelectric Technology Co.,Ltd. Address before: No.56 Keda Road, hi tech Zone, Ningbo City, Zhejiang Province, 315000 Applicant before: Ningbo sainaibi Photoelectric Technology Co.,Ltd. Country or region before: China |