CN109803467B - Multi-path LED driving device and method - Google Patents
Multi-path LED driving device and method Download PDFInfo
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- CN109803467B CN109803467B CN201910130816.9A CN201910130816A CN109803467B CN 109803467 B CN109803467 B CN 109803467B CN 201910130816 A CN201910130816 A CN 201910130816A CN 109803467 B CN109803467 B CN 109803467B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The embodiment provides a multi-path LED driving device and a multi-path LED driving method. The device comprises: the device comprises a first driving module, a second driving module, a switch module and a control module; the first driving module is used for driving a first LED in the multiple paths of LEDs; the second driving module is connected with the first driving module through a switch module, and is used for driving a second LED in the multiple paths of LEDs and providing working voltage for the first driving module; the control module is connected with the switch module and used for controlling the switch module to disconnect the passage when the first LED is closed so that the first driving module stops working. The embodiment provides a multipath LED driving device and a multipath LED driving method, which cut off a power supply path of a first driving module and primary circuit driving of a first LED through a switch module, reduce standby power consumption and meet the requirements of environmental protection.
Description
Technical Field
The embodiment relates to the technical field of LEDs, in particular to a multipath LED driving device and method.
Background
Light emitting diodes (Light Emitting Diode, simply LED) are widely used in the field of emerging energy-saving light sources with high efficiency, high integration and long lifetime.
With the increasing penetration of the green environment protection concept, the requirements on the whole light efficiency and standby power consumption of the intelligent LED lighting product are higher. In the prior art, the lighting effect (light efficiency) of the LED is generally improved by adopting a mode of improving the driving current of the LED, so that the standby power consumption of the LED is increased during standby (when the LED load is extinguished), and the requirement of green environmental protection is not satisfied.
Disclosure of Invention
The embodiment provides a multi-path LED driving device and a multi-path LED driving method, so as to reduce standby power consumption.
In a first aspect, the present embodiment provides a multi-path LED driving device, including: the device comprises a first driving module, a second driving module, a switch module and a control module;
the first driving module is used for driving a first LED in the multiple paths of LEDs;
the second driving module is connected with the first driving module through the switch module, and is used for driving a second LED in the multiple paths of LEDs and providing working voltage for the first driving module;
the control module is connected with the switch module and used for controlling the switch module to disconnect the passage when the first LED is closed so that the first driving module stops working.
In one possible design, the second driving module includes a constant voltage power supply unit;
the constant voltage power supply unit is used for providing working voltage for the first driving module; and/or
The constant voltage power supply unit is used for providing working voltage for the control module.
In one possible design, the second drive module further comprises a drive unit and a switch unit;
the driving unit is connected with the constant voltage power supply unit through the switch unit, the driving unit is used for driving a second LED in the multiple paths of LEDs, and the constant voltage power supply unit is used for providing working voltage for the driving unit;
the control module is connected with the switch unit and is also used for controlling the switch unit to disconnect the passage when the first LED is closed so that the driving unit stops working.
In one possible design, the drive unit includes a constant voltage control subunit and a constant current drive subunit;
the constant voltage control subunit is connected with the constant current driving subunit and is used for generating stable voltage;
the constant current driving subunit is connected with the control module and is used for generating dimming current according to the stable voltage under the control of the control module, and the dimming current is used for driving the second LED.
In one possible design, the constant current drive subunit is a linear power supply or a switching power supply.
In one possible design, the second driving module includes a voltage stabilizing unit and a second driving unit;
the voltage stabilizing unit is connected with the second driving unit and is used for generating driving voltage; the voltage stabilizing unit is used for providing working voltage for the control module;
the second driving unit is connected with the control module and is used for generating driving current according to the driving voltage under the control of the control module, and the driving current is used for driving the second LED.
In one possible design, the second drive module further comprises a voltage regulating unit;
the voltage regulating unit is connected with the voltage stabilizing unit and used for regulating the output voltage of the voltage stabilizing unit, and the output voltage is used for providing working voltage for the control module.
In one possible design, the control module includes: a wireless communication unit and a control unit;
the wireless communication unit is connected with the control unit and is used for receiving a switching signal sent by the intelligent control terminal; the switch signal is a signal for opening or closing a switch module passage;
the control unit is connected with the switch module and is used for responding to the switch signal to enable the switch module to open or close a passage.
In one possible design, the control module includes a plurality of PWM signal interfaces, each PWM signal interface being respectively connected to the PWM input interface of the first drive module and the PWM input interface of the second drive module for providing PWM signals to the first drive module and the second drive module.
In one possible design, the first drive module is any one of a buck converter, a buck-boost converter, and a flyback converter.
In a second aspect, the present embodiment provides a multi-path LED driving method, which is applicable to a multi-path LED driving device, where the driving device includes a first driving module, a second driving module, a switching module, and a control module;
the first driving module and the second driving module are connected through the switch module, and the control module is connected with the switch module;
the method comprises the following steps:
the first driving module drives a first LED in the multiple paths of LEDs;
the second driving module drives a second LED in the multiple paths of LEDs;
the second driving module provides working voltage for the first driving module through the switch module;
and when the first LED is turned off, the control module controls the switch module to disconnect the passage, so that the first driving module stops working.
In one possible design, the control module controlling the switching module to open the path when the first LED is turned off, such that the first driving module stops operating includes:
the control module acquires the switching state of the first LED and/or the second LED; wherein, the first LED and the second LED are in a standby state when both are turned off;
and if the first driving module is in a standby state, the control module generates a disconnection control signal, and the disconnection control signal is used for controlling the switch module to disconnect the channel, so that the first driving module stops working.
According to the multipath LED driving device and the multipath LED driving method, the first LED is used as a main load, the second LED is used as an auxiliary load, the first LED is driven through the first driving module, and the second LED is driven through the second driving module; the first driving module drives the first LED by adopting the primary circuit, so that the power loss of the multi-stage circuit when the multi-stage circuit performs the first LED illumination is reduced; the second driving module provides working voltage for the first driving module, and when in standby (when the first LED and the second LED are extinguished), the control module cuts off a power supply passage of the first driving module through the switch module and closes the first driving module, so that the first driving module stops working, and power consumption during standby is reduced. The embodiment provides a multipath LED driving device and a multipath LED driving method, which cut off a power supply path of a first driving module and primary circuit driving of a first LED through a switch module, reduce standby power consumption, achieve higher illumination light efficiency and lower standby power consumption, and meet the requirements of environmental protection.
Drawings
In order to more clearly illustrate this embodiment or the technical solutions of the prior art, the drawings that are required for the description of the embodiment or the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a multi-path LED driving device according to an exemplary embodiment of the present invention;
fig. 2 is a schematic structural diagram of a multi-path LED driving device according to another exemplary embodiment of the present invention;
fig. 3 is a schematic structural diagram of a multi-path LED driving device according to another exemplary embodiment of the present invention;
fig. 4 is a schematic structural diagram of a multi-path LED driving device according to another exemplary embodiment of the present invention;
fig. 5 is a flowchart of a multi-path LED driving method according to an exemplary embodiment of the present invention;
fig. 6 is a flowchart of a multi-path LED driving method according to another exemplary embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present embodiment more apparent, the technical solutions in the present embodiment will be clearly and completely described below with reference to the accompanying drawings in the present embodiment, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terms first and second in the description and claims of the invention and in the above-described figures are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. The terms "comprises" and "comprising" and any variations thereof, in the description and claims, are intended to cover a non-exclusive inclusion, such that a device that comprises a sequence of steps or structures is not necessarily limited to those structures or steps that are expressly listed or inherent to such process or device but may include other steps or structures not expressly listed or inherent to such process or device.
The term "and/or" is merely a relation describing the association object, and means that three kinds of relations may exist, for example, a and/or B, and that a alone exists, a and B together, and B alone exists.
The specific scene of the embodiment is a scene based on multiplexing output driving LED illumination.
The luminous intensity of an LED is determined by the current flowing through the LED, and stable LED luminous intensity requires constant current driving. The multi-path LED driving circuit comprises an AC/DC converter which is controlled by constant voltage and converts alternating current into direct current and a plurality of stages of DC/DC converters which are controlled by constant current and convert one direct voltage into other direct voltage, each path of LED load is controlled by constant current driving realized by an independent DC/DC converter, and the driving efficiency is correspondingly reduced when one stage of DC/DC converter is added, so that the light efficiency of the whole LED lamp is poor; when the LEDs are turned off, both the AC/DC converter and the DC/DC converter are in an idle working state, so that standby power consumption is larger. Wherein standby refers to all LEDs being off.
The multi-path LED driving device and method provided in this embodiment aim to solve the above technical problems, and provide the following solutions: the first LED is used as a main load, the second LED is used as an auxiliary load, the first LED is driven by the first driving module, and the second LED is driven by the second driving module; the first driving module drives the first LED by adopting the primary circuit, so that the power loss of the multi-stage circuit when the multi-stage circuit performs the first LED illumination is reduced; the second driving module provides working voltage for the first driving module, and when in standby (when the first LED and the second LED are extinguished), the control module cuts off a power supply passage of the first driving module through the switch module and closes the first driving module, so that the first driving module stops working, and power consumption during standby is reduced.
The following describes the technical scheme of the present invention and how the technical scheme of the present invention solves the above technical problems in detail with specific embodiments. The following embodiments may be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments. Embodiments of the present invention will be described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a multi-path LED driving device according to an exemplary embodiment of the present invention. The multi-path LED driving device shown in fig. 1 includes a first driving module 11, a second driving module 12, a switching module 13, and a control module 14; the first driving module 11 is used for driving a first LED15 in the multiple paths of LEDs; the second driving module 12 is connected with the first driving module 11 through the switch module 13, and the second driving module 12 is used for driving a second LED16 in the multiple paths of LEDs and providing working voltage for the first driving module 11; the control module 14 is connected to the switch module 13 for controlling the switch module 13 to open the path when the first LED15 is turned off so that the first driving module 11 stops operating. Optionally, the brightness of the first LED15 is greater than the brightness of the second LED16.
In a specific implementation process, the input end of the first driving module 11 is connected with an alternating current power supply, the output end of the first driving module is connected with the first LED15, the input end of the second driving module 12 is connected with the alternating current power supply, and the output end of the second driving module is connected with the second LED 16; alternatively, the second driving module 12 provides the operating voltage to both the first driving module 11 and the control module 14. According to the first brightness adjustment signal generated by the control module 14, the first driving module 11 generates a first dimming current to drive the first LED15; according to the second brightness adjustment signal generated by the control module 14, the second driving module 12 generates a second dimming current to drive the second LED; wherein the first brightness adjustment signal and the second brightness adjustment signal are both pulse width modulation (Pulse Width Modulation, PWM) signals; the first LED is an LED main load and used for guaranteeing light efficiency in LED illumination, the second LED is an LED auxiliary load, the second LED can comprise multiple paths of LED loads, and each path of LED load corresponds to one PWM signal.
In a possible implementation, the control module 14 includes a single-chip microcomputer, and the control module 14 includes a plurality of PWM signal interfaces, where each PWM signal interface is connected to a PWM input interface of the first driving module 11 and a PWM input interface of the second driving module 12, respectively, and is configured to provide PWM signals to the first driving module 11 and the second driving module 12. In practical applications, the PWM control register of the software adjustment control module 14 is used to adjust the duty ratio of PWM, so as to control the magnitude of the dimming current, thereby adjusting the brightness.
The switching module 13 performs opening and closing of the passage in response to a switching signal from the control module 14. The two ends of the switch module 13 are respectively connected with the working voltage input end of the first driving module 11 and the working voltage output end of the second driving module 12, and the opening and closing of the passage are realized through the switch module 13, so that the on-off control of the working voltage of the first driving module 11 is further performed.
The first driving module 11 is a primary constant current driving circuit, so that power loss during first LED illumination is reduced.
In one implementation, the first drive module 11 is a single tube converter with input and output isolation, which is input and output isolated, and can achieve multiple outputs. Specifically, the Flyback converter (Flyback converter) can be adopted, and the Flyback converter only stores and does not transmit energy during the conduction period of the main switching tube; a circuit architecture for delivering energy to a load during the time that the main switching tube is off. Isolation of the input and output of the first drive module 11 is achieved using flyback converters.
In another implementation manner, the first driving module 11 is a non-isolated power conversion topology structure, and may specifically be any one of a buck converter and a buck-boost converter. The Buck converter (Buck converter) is a single-tube non-isolated DC converter with an output voltage less than an input voltage. The Buck-Boost converter is a single-tube non-isolated DC converter with an output voltage that is either lower or higher than the input voltage, but with an output voltage that is opposite in polarity to the input voltage.
In practical application, the first driving module 11 and the second driving module 12 respectively drive the first LED15 and the second LED16, and the first driving module 11 adopts a primary driving current; the control module 14 acquires the switching states of the first LED and the second LED16, and when the first LED and the second LED are turned off (i.e., when standby), the control module 14 controls the switching module 13 to open the path so that the first driving module 11 stops operating. Because the first driving module 11 is used for generating the first dimming current, the power consumption is very large, and the first driving module 11 stops working, compared with the prior art that the first driving module 11 does not stop working when in standby, the standby power consumption is greatly reduced.
It should be understood that when only the first LED is turned off, the control module 14 obtains the on-off state of the first LED, and controls the on-off module 13 to turn off the tung cottage, so that the first driving module 11 stops working, and lower working power consumption of the multi-path LED driving device can also be realized.
Fig. 2 is a schematic structural diagram of a multi-path LED driving device according to an exemplary embodiment of the present invention. Fig. 2 is a diagram of the second drive module with its components optimized based on the embodiment of fig. 1.
As described in fig. 2:
the second driving module 12 includes a constant voltage power supply unit 121; the constant voltage power supply unit 121 is used to provide the operating voltage for the first driving module 11, and the constant voltage power supply unit 121 may also be used to provide the operating voltage for the control module 14. The constant voltage power supply unit 121 is an independent power supply module, and may be a switching power supply in order to secure power conversion efficiency.
In one possible implementation, the second driving module 12 further includes a first driving unit 122 and a switching unit 123; the first driving unit 122 and the constant voltage power supply unit 121 are connected through a switching unit 123; the control module 14 is connected to the switching unit 123, and is further configured to control the switching unit 123 to open the path when the first LED15 is turned off so that the first driving unit 122 stops operating. In the present embodiment, the first driving unit 122 drives the second LED16 among the multiple LEDs, and the constant voltage power supply unit 121 supplies the first driving unit 122 with an operating voltage. It should be understood that the switching unit 123 may have the same structure as the switching module 13 for opening and closing the path in response to the switching signal from the control module 14.
In one possible implementation, the first driving unit 122 includes a constant voltage control subunit and a constant current driving subunit; the constant voltage control subunit is connected with the constant current driving subunit and used for generating stable voltage; the constant current driving subunit is connected to the control module 14, and is configured to generate a dimming current according to the stable voltage under the control of the control module 14, where the dimming current is used to drive the second LED16. It should be understood that the dimming current is the second dimming current in the embodiment of fig. 1.
Optionally, the constant current driving subunit is a linear power supply or a switching power supply.
In this embodiment, the first driving module 11, the control module 14 and the first driving unit 122 all provide the working voltage from the constant voltage power unit 121, the two ends of the switch module 13 are connected to the first driving module 11 and the constant voltage power unit 121, and the two ends of the switch unit 123 are connected to the first driving unit 122 and the constant voltage power unit 121; in operation, the control module 14 obtains the switching states of the first LED and the second LED, and when the first LED and the second LED are turned off (i.e., in standby), the control switch module 13 and the switch unit 123 are controlled to open the paths, so that the first driving module 11 and the first driving unit 122 stop working. At this time, only the constant power supply unit 121 and the control module 14 in the driving device are in an operating state, so that lower power consumption in standby is realized.
Fig. 3 is a schematic structural diagram of a multi-path LED driving device according to another exemplary embodiment of the present invention.
Fig. 3 is a diagram of the second drive module with its components optimized based on the embodiment of fig. 1.
As described in fig. 3:
the second driving module 12 includes a voltage stabilizing unit and a second driving unit; the voltage stabilizing unit is connected with the second driving unit and is used for generating driving voltage; the voltage stabilizing unit is used for providing working voltage for the control module 14; the second driving unit is connected to the control module 14 and is configured to generate a driving current according to the driving voltage under the control of the control module 14, where the driving current is used to drive the second LED16.
The voltage stabilizing unit is a constant voltage control unit, and can be a single-tube converter with input and output isolation or a Buck converter (Buck converter). Optionally, a voltage regulating module is arranged between the voltage stabilizing unit and the control module and used for regulating the output working voltage of the voltage stabilizing unit, and the voltage regulating module is a DC/DC module.
The voltage stabilizing unit is connected with the voltage input end of the first driving module 11 through the switch module 13 and is used for providing working voltage for the first driving module 11. In this embodiment, the voltage stabilizing unit provides the working voltage for the first driving module 11 and the control module 14, and simultaneously provides the driving voltage for the second driving unit, so as to realize the integration of the circuits.
Fig. 4 is a schematic structural diagram of a multi-path LED driving device according to another exemplary embodiment of the present invention. Fig. 4 is a schematic diagram of the optimization of the composition of the control module based on the above-described embodiment, such as the embodiment shown in fig. 1. As described in fig. 4:
the control module 14 comprises a wireless communication unit and a control unit, wherein the wireless communication unit is connected with the control unit and is used for receiving a switching signal sent by the intelligent control terminal 17; wherein, the switch signal is a signal for opening or closing the path of the switch module 13, and the intelligent control terminal 17 comprises any one of the following: smart phones, computers, personal digital assistants, and smart wearable devices.
The wireless communication unit may be a circuit including a communication chip, and specifically configured to receive the switching signal of the first LED15 from the intelligent control terminal 17 through the wireless networking device. The wireless networking device may be any one of the following: wireless fidelity (Wireless Fidelity, wi-Fi) router, zigBee protocol (ZigBee) gateway, and radio frequency routing coordinator.
The intelligent control terminal 17 is provided with an application program for sending a control signal, and a user sends the on-off states of the first LED and the second LED through the application program, alternatively, the user can set brightness adjustment values of the first LED and the second LED through the application program, and the application program generates brightness adjustment information according to the brightness adjustment values set by the user, so that the adjustment of the illumination brightness of the first LED and the second LED is realized.
In a specific application, the control unit is connected with the wireless routing unit, receives the switching signal to obtain the switching states of the first LED and the second LED, responds to the switching signal and sends out a control signal.
In one implementation, the control unit is connected to the switch module 13, receives the switch signal and controls the switch module 13 to disconnect the path in response to the switch signal, so that the first driving module 11 stops working.
In another implementation, the control unit is connected to the switching unit 123, receives the switching signal and controls the switching unit 123 to open the path in response to the switching signal, so that the first driving unit 122 stops operating.
In this embodiment, the remote control of the control unit is realized through the wireless communication unit, and further, the remote control of the switch module 13 and the switch unit 123 is realized. For clarity of illustration of the embodiment, in one possible application scenario, the intelligent control terminal 17 is a smart phone, the wireless networking device is a wireless router, the control unit is connected to the wireless router through a Wi-Fi module, and the intelligent control terminal 17 is provided with an APP that sends a switching signal. When the user observes that the first LED15 and the second LED16 are turned OFF, the smart phone sends an OFF signal to the control unit, and the control unit controls the switch module 13 and the switch unit 123 to disconnect the paths in response to the OFF signal, so that the first driving module 11 and the first driving unit 122 stop working, and lower standby power consumption is realized. When the first LED15 and the second LED16 are in an operating state, a user can also send an OFF/ON signal to the control unit through the intelligent control terminal 17, and the control unit controls the switch module 13 and the switch unit 123 to open or close the channels, so as to realize remote switch control of the first LED15 and the second LED16. It should be understood that the first LED15 and the second LED16 are separately driven, respectively, so that remote switching control can be performed, respectively.
Fig. 5 is a flow chart of a multi-path LED driving method according to an embodiment of the invention. The method is applicable to a multi-path LED driving device, taking the driving device in the embodiment of FIG. 1 as an example, the driving device comprises a first driving module 11, a second driving module 12, a switch module 13 and a control module 14; the first driving module 11 and the second driving module 12 are connected through the switch module 13, and the control module 14 is connected with the switch module 13.
As shown in fig. 5, the method may include the steps of:
s501, a first driving module driver 11 drives a first LED15 in multiple paths of LEDs.
S502, the second driving module 12 drives the second LED16 in the multiple paths of LEDs.
S503, the second driving module 12 provides the working voltage for the first driving module 11 through the switch module 13.
S504, the control module 14 controls the switch module 13 to open the path when the first LED15 is turned off, so that the first driving module 11 stops working.
In practical application, the first driving module 11 and the second driving module 12 respectively drive the first LED15 and the second LED16, the first driving module 11 adopts a first-stage driving current, and the lighting effect can be ensured by a larger first dimming current; the control module 14 acquires the switching state of the first LED, and when the first LED and the second LED are turned off (i.e., in standby), the control switch module 13 opens the path so that the first driving module 11 stops operating. Because the first driving module 11 is configured to generate the first dimming current, and is the maximum power consumption module, the first driving module 11 stops working, and compared with the prior art in which the first driving module 11 does not stop working during standby, the power consumption during standby is greatly reduced.
Fig. 6 is a flow chart of a multi-path LED driving method according to another embodiment of the invention. Fig. 6 is a flowchart for explaining the step S504 based on the method shown in fig. 5, and the method includes:
s601, the control module 14 acquires the switching state of the first LED15 and/or the second LED 16; wherein the first LED15 and the second LED16 are in a standby state when both are turned off;
in one embodiment, the control module 14 receives a switching signal sent by the intelligent control terminal, and obtains the switching state of the first LED15 and/or the second LED, where the intelligent control terminal may be any one of the following: smart phones, computers, personal digital assistants, and smart wearable devices.
S602, if the driving module is in the standby state, the control module 14 generates an off control signal, where the off control signal is used to control the switch module 13 to turn off the path, so that the first driving module 11 stops working.
Alternatively, if the first LED15 is turned off, the control module 14 generates an off control signal for controlling the switch module 13 to open the path, so that the first driving module 11 stops operating.
When the user observes that the first LED is turned OFF, or the first LED and the second LED are turned OFF (i.e., in a standby state), the intelligent control terminal sends an OFF signal to the control module 14, and the control module 14 responds to the OFF signal to control the switch module 13 to disconnect the channel, so that the first driving module 11 stops working, and lower standby power consumption is realized. When the first LED is in a working state, a user can also send an OFF/ON signal to the control module 14 through the intelligent control terminal, and the control unit controls the switch module 13 to open or close a channel so as to realize remote switch control of the first LED.
The above-mentioned multi-path LED driving method, correspondingly, may be applied to the technical scheme of the multi-path LED driving device in any embodiment, and its implementation principle and technical effect are similar, and will not be described herein again.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (12)
1. A multiple LED driving apparatus, comprising: the device comprises a first driving module, a second driving module, a switch module and a control module;
the first driving module is used for driving a first LED in the multiple paths of LEDs;
the second driving module is connected with the first driving module through the switch module, and is used for driving a second LED in the multiple paths of LEDs and providing working voltage for the first driving module;
the control module is connected with the switch module and used for controlling the switch module to disconnect the passage when the first LED is closed so that the first driving module stops working.
2. The driving device according to claim 1, wherein the second driving module includes a constant voltage power supply unit;
the constant voltage power supply unit is used for providing working voltage for the first driving module; and/or
The constant voltage power supply unit is used for providing working voltage for the control module.
3. The drive device according to claim 2, wherein the second drive module further comprises a first drive unit and a switching unit;
the first driving unit is connected with the constant voltage power supply unit through the switch unit, the first driving unit is used for driving a second LED in the multiple paths of LEDs, and the constant voltage power supply unit is used for providing working voltage for the first driving unit;
the control module is connected with the switch unit and is also used for controlling the switch unit to disconnect the passage when the first LED is closed so that the first driving unit stops working.
4. A driving device according to claim 3, wherein the first driving unit includes a constant voltage control subunit and a constant current driving subunit;
the constant voltage control subunit is connected with the constant current driving subunit and is used for generating stable voltage;
the constant current driving subunit is connected with the control module and is used for generating dimming current according to the stable voltage under the control of the control module, and the dimming current is used for driving the second LED.
5. The drive of claim 4, wherein the constant current drive subunit is a linear power supply or a switching power supply.
6. The drive device according to claim 1, wherein the second drive module includes a voltage stabilizing unit and a second drive unit;
the voltage stabilizing unit is connected with the second driving unit and is used for generating driving voltage; the voltage stabilizing unit is used for providing working voltage for the control module;
the second driving unit is connected with the control module and is used for generating driving current according to the driving voltage under the control of the control module, and the driving current is used for driving the second LED.
7. The drive device of claim 6, wherein the second drive module further comprises a pressure regulating unit;
the voltage regulating unit is connected with the voltage stabilizing unit and used for regulating the output voltage of the voltage stabilizing unit, and the output voltage is used for providing working voltage for the control module.
8. The drive of claim 1, wherein the control module comprises: a wireless communication unit and a control unit;
the wireless communication unit is connected with the control unit and is used for receiving a switching signal sent by the intelligent control terminal; the switch signal is a signal for opening or closing a switch module passage;
the control unit is connected with the switch module and is used for responding to the switch signal to enable the switch module to open or close a passage.
9. The drive of claim 1, wherein the control module comprises a plurality of PWM signal interfaces, each PWM signal interface being respectively coupled to the PWM input interface of the first drive module and the PWM input interface of the second drive module for providing PWM signals to the first drive module and the second drive module.
10. The drive device according to claim 1, wherein the first drive module is any one of a buck converter, a buck-boost converter, and a flyback converter.
11. A multi-path LED driving method is characterized in that,
the method is applicable to a multipath LED driving device, and the driving device comprises a first driving module, a second driving module, a switch module and a control module;
the first driving module and the second driving module are connected through the switch module, and the control module is connected with the switch module;
the method comprises the following steps:
the first driving module drives a first LED in the multiple paths of LEDs;
the second driving module drives a second LED in the multiple paths of LEDs;
the second driving module provides working voltage for the first driving module through the switch module;
and when the first LED is turned off, the control module controls the switch module to disconnect the passage, so that the first driving module stops working.
12. The driving method according to claim 11, wherein the control module controlling the switching module to open the path when the first LED is turned off so that the first driving module stops operating includes:
the control module acquires the switching state of the first LED and/or the second LED; wherein, the first LED and the second LED are in a standby state when both are turned off;
and if the first driving module is in a standby state, the control module generates a disconnection control signal, and the disconnection control signal is used for controlling the switch module to disconnect the channel, so that the first driving module stops working.
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| CN111654949B (en) * | 2020-08-05 | 2020-11-24 | 深圳市明微电子股份有限公司 | LED lamp driving power circuit and LED lamp driving system |
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