CN113056053B - Dual-channel cold-warm color temperature LED control circuit - Google Patents
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- 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]
- H05B45/20—Controlling the colour of the light
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- 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
- H05B45/37—Converter circuits
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- 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]
- H05B45/40—Details of LED load circuits
Abstract
The invention relates to the field of LEDs, in particular to a double-channel cold and warm color temperature LED control circuit, which comprises a unidirectional current source Iin, a current control circuit, a sampling resistor Rcs, an output branch 1 and an output branch 2, wherein the current control circuit, the sampling resistor Rcs, the unidirectional current source Iin, the output branch 1 and the output branch 2 form a current feedback closed loop, the output branch 1 and the output branch 2 are circularly and sequentially conducted, the current control circuit controls the current of the output branch 1 in a single cycle and controls the current of the output branch 2 through negative feedback, and the sampling resistor Rcs samples the current signal of the unidirectional current source Iin and controls the single-cycle current of the output branch 1 and the closed loop current of the output branch 2.
Description
Technical Field
The invention relates to the field of LEDs, in particular to a double-channel cold and warm color temperature LED control circuit.
Background
Due to the characteristics of high efficiency, energy saving and long service life, LEDs are widely applied in the field of illumination, sometimes an LED lamp needs to adjust color temperature, and an LED light source with two color temperatures is matched for light mixing. The two light source currents are complementary, namely, when the cold color temperature light source current is increased, the warm color temperature light source current is correspondingly reduced, the light spectrum of the lamp is more biased to the cold color temperature, and conversely, the light spectrum of the lamp is more biased to the warm color temperature.
In the prior art, a two-stage or multi-stage scheme is generally adopted, the front stage obtains constant voltage output, the rear stage realizes two paths of constant current driving, the realization mode is divided into two modes of linear current limiting and DC/DC constant current driving, wherein the linear current limiting mode is realized simply, but linear voltage drop is completely lost on a MOSFET, the circuit loss is large, the efficiency is low, and particularly when the bus voltage and the actual LED conduction voltage drop differ greatly; the DC/DC constant current driving mode has a complex circuit structure, and generally, due to the complex circuit and the large number of elements, the power supply adopting the circuit structure has low design life and high cost, and cannot meet the technical requirements of high-quality LED power supplies.
In view of the above, there is an urgent need to design a new two-way cold-warm color temperature driving power supply scheme to overcome the above-mentioned drawbacks of the prior art.
Disclosure of Invention
Based on this, this application provides one kind compare in linear loss suppression circuit, and actual loss is little, and is efficient, compares in double-circuit DC/DC circuit, and circuit cost is low, realizes simple and convenient double-circuit changes in temperature colour temperature power and its control circuit, and its circuit is simple, and control is convenient.
In a first aspect, the present application provides a dual-channel cool-warm color temperature LED control circuit, comprising: the unidirectional current source Iin, the current control circuit, the sampling resistor Rcs, the output branch 1 and the output branch 2, the current control circuit, the sampling resistor Rcs, the unidirectional current source Iin, the output branch 1 and the output branch 2 form a current feedback closed loop, the output branch 1 and the output branch 2 are sequentially conducted in a circulating mode, the current control circuit controls the current of the output branch 1 by adopting a single cycle, controls the current of the output branch 2 through negative feedback, and the sampling resistor Rcs samples a current signal of the unidirectional current source Iin and controls the single cycle current of the output branch 1 and the closed loop current of the output branch 2.
Preferably, the output branch 1 and the output branch 2 are arranged in parallel and connected with the output of the unidirectional current source Iin in parallel, and the sampling resistor Rcs is located on a parallel circuit of the output branch 1 and the output branch 2 and the unidirectional current source Iin.
Preferably, the output branch 1 includes an output load LED1, an output filter capacitor Co1, a diode D1 and a switching tube S1, where the output filter capacitor Co1 is connected in parallel with the output load LED1, and the diode D1 and the switching tube S1 are connected in series with the output load LED 1.
Preferably, the output branch 2 includes an output load LED2, an output filter capacitor Co2, a diode D2 and a switching tube S2, where the output filter capacitor Co2 is connected in parallel with the output load LED2, and the diode D2 and the switching tube S2 are connected in series with the output load LED 2.
Preferably, the G end of the Rs trigger of the current control circuit is connected with the control ends of the switching tubes S1 and Sb, the S end is connected with the unidirectional current source Iin, the R end is connected with the output end of the comparator Comp1,the ends are connected with the control ends of the switching tubes Sa and S2, the input end of the comparator Comp1 is respectively connected with the output end of the operational amplifier Op1 and the Vdim signal, the two ends of the integrating capacitor Cint are connected with the input end and the output end of the operational amplifier Op1, and the switch SaThe input end and the output end are connected in parallel with the two ends of the integrating capacitor Cint, the input end of the operational amplifier Op1 is connected with the sampling resistor Rcs through the integrating resistor Rint, the two ends of the compensating capacitor Ccomp are connected with the input end and the output end of the operational amplifier Op2, the input end of the operational amplifier Op2 is respectively connected with the output end of the feedback resistor Rfb2 and the subtracter, the feedback resistor Rfb1 is connected with the sampling resistor Rcs and the feedback resistor Rfb2 in series, and the input end and the output end of the switch Sb are connected with the two ends of the feedback resistor Rfb1 and the sampling resistor Rcs in parallel.
Preferably, the current sampling signal of the sampling resistor Rcs charges and integrates the integrating capacitor Cint through the integrating resistor Rint, and when the voltage of the integrating capacitor Cint reaches the set voltage, the trigger is reset.
Preferably, the output branch 2 adopts negative feedback control based on the operational amplifier Op2, the reference signal at the same phase end is Vdim2, when the current sampling signal of the output branch 2 is smaller than Vdim2, the output current of the front-stage unidirectional current source Iin is increased, and when the current sampling signal of the output branch 2 is larger than Vdim2, the output current of the front-stage unidirectional current source Iin is reduced.
Preferably, the formula for obtaining the Vdim2 value is as follows:
wherein Vdim2 represents the current reference of branch 2; vref represents the total current reference; vdim represents the current reference of branch 1.
In a second aspect, the present application provides a dual-channel cold-hot color temperature power supply, which is used for the dual-channel cold-hot color temperature power supply and a control circuit thereof.
Compared with the prior art, the invention has the following characteristics and beneficial effects:
1. the current control circuit is characterized in that the output branch 1 is firstly conducted, when the current of the output branch 1 reaches a set value, the output branch 1 is turned off, meanwhile, the output branch 2 is conducted, the output branch 1 is conducted while the branch output branch 2 is turned off until a new switching period starts, and the output branch 1 is conducted in a circulating mode in turn;
2. according to the method, two paths of currents are distributed, so that a cold color temperature light source and a warm color temperature light source are respectively driven on an output branch 1 and an output branch 2, a switching tube connected in series with a cold color temperature load branch and a warm color temperature load branch is sequentially conducted, when dimming output is needed, the current reference of the branch 1 can be adjusted, the output average current of the branch 1 can be adjusted, the output current of the branch 1 can be increased by increasing the current reference of the branch 1, meanwhile, the current reference of the branch 2 is reduced, the current reference of the branch 1 is reduced, meanwhile, the current reference of the branch 2 is increased, namely, the double-path output complementary adjustment is realized by adjusting the current reference of the branch 1, and then the color temperature of a lamp is adjusted;
3. the single-cycle control is completed in real time in the period, so that the speed response is fast, the current flowing through the switching tube S1 is controlled and regulated by adopting the single-cycle control on the output branch 1, when the input source has low-frequency ripple waves and disturbance, the circuit can automatically adjust the on duty ratio of the switching tube S1, the period average current of the output branch 1 is ensured to be constant, and the effect of inhibiting the low-frequency ripple waves and the disturbance is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the related art, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a schematic diagram of a dual-channel cold-warm color temperature power supply according to the present invention;
FIG. 2 is a schematic diagram of a two-way cold-warm color temperature power supply control circuit;
FIG. 3 is a schematic diagram of waveforms during the implementation of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application. All other examples, based on the examples herein, which a person of ordinary skill in the art would obtain without undue burden, are within the scope of protection of the present application.
It should be understood by those skilled in the art that technical or scientific terms used in the claims and the specification should be given the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect; "and/or", describes an association relationship of the association object, indicating that three relationships may exist; the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used for convenience in describing and simplifying the description based on the orientation or positional relationship shown in the drawings, and do not denote or imply that the devices or elements being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore the above terms should not be construed as limiting the invention.
As shown in fig. 1, an embodiment of the present invention provides a dual-path cold-warm color temperature power supply, including: the unidirectional current source Iin, the current control circuit, the sampling resistor Rcs, the output branch 1 and the output branch 2 are sequentially connected, the output branch 1 and the output branch 2 are sequentially conducted in a circulating mode, the current control circuit controls the current of the output branch 1 in a single cycle mode, controls the current of the output branch 2 through negative feedback, the sampling resistor Rcs samples a current signal of the unidirectional current source Iin, controls the single-cycle current of the output branch 1 and the closed-loop current of the output branch 2, the unidirectional current source Iin is input to be controlled and fed back, the total output current is guaranteed to reach a load current set value through negative feedback control, and when the input source has low-frequency ripple and disturbance, the circuit can automatically adjust the conduction duty ratio of the switch tube S1, the periodic average current of the output branch 1 is guaranteed to be constant, and the effect of inhibiting the low-frequency ripple and disturbance is achieved.
Specifically, the single-cycle control means that the output branch is controlled in the current switching cycle. For example, when the output branch 1 is turned on and the current of the unidirectional current source Iin flows to the output load of the output branch 1, and when the current of the output branch 1 reaches a set value, the output branch 1 is turned off, and meanwhile, the output branch 2 is turned on and turned on in a circulating way sequentially, and compared with a linear current limiting mode, the mode distributes bus current output by the unidirectional current source Iin at the previous stage when the switching tube of the corresponding output branch is in a switching state, so that the circuit loss is low.
Preferably, the output branch 1 and the output branch 2 are arranged in parallel and connected in parallel with the output of the unidirectional current source Iin, and the sampling resistor is connected in series with the output branch 1 and the unidirectional current source Iin and in series with the output branch 2 and the unidirectional current source Iin.
The output branch 1 comprises an output load LED1, an output filter capacitor Co1, a diode D1 and a switch tube S1, wherein the output filter capacitor Co1 is connected with the output load LED1 in parallel, and the diode D1 and the switch tube S1 are connected with the output load LED1 in series; the output branch circuit 2 comprises an output load LED2, an output filter capacitor Co2, a diode D2 and a switch tube S2, wherein the output filter capacitor Co2 is connected with the output load LED2 in parallel, the diode D2 and the switch tube S2 are connected with the output load LED2 in series, the output load LED is connected in each output branch circuit in series, and when the corresponding output branch circuit is conducted, the output load LED is powered.
The diode is selected as a unidirectional rectifying diode, the output end of the unidirectional rectifying diode is connected with an output load, and the unidirectional rectifying diode can prevent the filter capacitor Co of the output branch circuit from being forced to be shared when the switching tubes of the output branch circuit are shared, so that impact current is generated and current is damaged.
The switching tube can be MOSFFETs, triodes and IGBTs and is used for controlling the on-off of corresponding load branches, and compared with a linear current limiting scheme, the MOSFET (transistor) works in a switching state and distributes bus current output by a front stage, so that the circuit loss is low.
The filter capacitor Co is used for reducing output voltage and current ripple, and the sampling resistor Rcs is used for assisting in completing current control.
As shown in fig. 2, the current control circuit includes switching transistors Sa and Sb, operational amplifiers Op1 and Op2, a comparator Comp1, an integrating resistor Rint, an integrating capacitor Cint, feedback resistors Rfb1, rfb2, a compensation capacitor Ccomp, a trigger and a subtractor, wherein a G terminal of the trigger is connected to control terminals of the switching transistors S1 and Sb, a S terminal is connected to a unidirectional current source Iin, a R terminal is connected to an output terminal of the comparator Comp1,the end is connected with the control ends of the switching tubes Sa and S2, the input end of the comparator Comp1 is respectively connected with the output end of the operational amplifier Op1 and the Vdim signal, the two ends of the integrating capacitor Cint are connected with the input end and the output end of the operational amplifier Op1, the input end and the output end of the switch Sa are connected with the two ends of the integrating capacitor Cint in parallel, the input end of the operational amplifier Op1 is connected with the sampling resistor Rcs through the integrating resistor Rint, the two ends of the compensating capacitor Ccomp are connected with the input end and the output end of the operational amplifier Op2, the input end of the operational amplifier Op2 is respectively connected with the output end of the feedback resistor Rfb2 and the subtracter, the feedback resistor Rfb1 is connected with the sampling resistor Rcs and the feedback resistor Rfb2 in series, and the input end and the output end of the switch Sb are connected with the two ends of the feedback resistor Rfb1 and the sampling resistor Rcs in parallel.
The operation principle of the current control circuit is as follows: when the synchronous CLK signal enables the RS trigger, S1 is conducted, sa is closed, current flows through the load branch 1, the current sampling signal of the sampling resistor Rcs starts to charge the integrating capacitor Cint through the integrating resistor Rint, as the integrating capacitor Cint is charged gradually, when the Vcomp voltage rises to Vdim, the output of the first comparator Comp1 is set high, the RS trigger is reset, the switching tube S1 is turned off, meanwhile, the switching tube Sa is conducted and reset, the voltage at two ends of the integrating capacitor Cint is reset, the circuit maintains the state until a new CLK clock signal enables the RS trigger again, and the switching frequency of the CLK signal and a preceding-stage constant current source is kept synchronous.
Specifically, the output branch 2 adopts negative feedback control based on the operational amplifier Op2, the reference signal at the same phase end is Vdim2, when the switching tube S1 is turned on, the S2 is turned off and Sb is turned on, the inverted input signal of the operational amplifier Op2 is 0, when the switching tube S1 is turned off, the S2 is turned on and Sb is turned off, the voltage signal on the sampling resistor Rcs is added to the inverted input of the operational amplifier Op2, the signal at the inverted input end of the operational amplifier Op2 is equivalent to the current signal of the output branch 2, when the current sampling signal of the branch 2 is smaller than Vdim2, the output Vfb signal is increased, the input current Iin of the preceding stage is increased, and then the current of the output branch 2 is increased, otherwise, when the current sampling signal of the output branch 2 is larger than Vdim2, the output Vfb signal is reduced, and then the current of the output branch 2 is reduced.
The equation for obtaining the value of Vdim2 can be obtained by subtraction from the subtractor in fig. 2 as follows:
wherein Vdim2 represents the current reference of branch 2; vref represents the total current reference; vdim represents the current reference of branch 1.
According to the above, the voltage signal at two ends of the sampling resistor Rcs charges the integration capacitor Cint through the integration resistor Rint, and resets the RS trigger when the voltage of the integration capacitor Cint reaches the set voltage Vdim, S1 is turned off, sa is turned on;
the capacitance Δq of the integration capacitor Cint is calculated as follows:
wherein Cint is the integrating capacitor, Δv is the voltage across the integrating capacitor, ton is the on-time, and Io (t) is the current in the load branch during time t.
The formula of the current period average value of the output branch 1 is as follows:
wherein, rcs, cint, rint, ts and Vdim are constants, and the average current output by the periodic chopping of the branch 1 is a fixed value, thereby realizing single-cycle constant current control.
When the switching tube S1 is turned on, S2 is turned off and Sb is turned on, and the inverted input signal of Op2 is 0; when the switching tube S1 is turned off, S2 is turned on Sb is turned off, and the voltage signal across the resistor Rcs is applied to the inverting input of Op 2. According to negative feedback, there are:
when (when)In this case, the current period average value formula of the output branch 2 can be simplified to be:
i.e. when Rcs and Vdim2 are fixed values, the current period average of the output branch 2 is a fixed value.
Specifically, when dimming output is required, the output average current of the output branch 1 can be adjusted by adjusting Vdim, the output current of the branch 1 can be increased by increasing Vdim, meanwhile, vdim2 can be reduced, then the current of the branch 2 is reduced, vdim2 can be increased by reducing Vdim, and the current of the branch 2 is increased, so that two-way output complementary adjustment can be realized by adjusting Vdim, and further, the color temperature of the lamp can be adjusted.
As shown in fig. 3, the output branch 1 is turned on and off according to a set current value. During the switch on period, when the voltage of the integrating capacitor rises to a set Vdim, the switch connected in series with the output branch 1 is turned off, and meanwhile, the output branch 2 is turned on; according to the derived single-cycle control algorithm, the periodic average current of the output branch 1 is a fixed value and is related to the Vdim in a positive proportion, that is, when the output branch 1 is conducted, no current passes through the output branch 2, vcomp of the output branch 1 increases along with the flowing duration of the load current, when the Vcomp voltage reaches the Vdim state, the output branch 1 is turned off, the output branch 2 starts to be conducted, the output branch 2 adopts negative feedback control based on the operational amplifier Op2, the reference signal at the same phase end is Vdim2, when the switching tube S1 is conducted, the switching tube S2 is turned off, the inverted input signal of the operational amplifier Op2 is turned on and off, when the switching tube S1 is turned off, the voltage signal at the inverted input end of the sampling resistor Rcs is added to the inverted input of the operational amplifier Op2, the signal at the inverted input end of the operational amplifier Op2 is equivalent to the current signal of the output branch 2, when the current sampling signal of the branch 2 is smaller than the Vdim2, the output Vfb signal is increased, the input current of the preceding stage is increased, when the current of the output branch 2 is increased, the inverted input current of the output branch 2 is further increased, when the sampling signal of the output branch 2 is smaller than the Vdim2 is sequentially decreased, and the output current is sequentially decreased.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present application. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.
Claims (5)
1. A double-circuit changes in temperature colour temperature LED control circuit, its characterized in that: the current control circuit adopts single-cycle control to control the current of the output branch 1 and the current of the output branch 2 through negative feedback, and the sampling resistor Rcs samples the current signal of the unidirectional current source Iin and controls the single-cycle current of the output branch 1 and the closed-loop current of the output branch 2;
the output branch circuit 1 comprises an output load LED1, an output filter capacitor Co1, a diode D1 and a switch tube S1, wherein the output filter capacitor Co1 is connected with the output load LED1 in parallel, and the diode D1 and the switch tube S1 are connected with the output load LED1 in series;
the output branch circuit 2 comprises an output load LED2, an output filter capacitor Co2, a diode D2 and a switch tube S2, wherein the output filter capacitor Co2 is connected with the output load LED2 in parallel, and the diode D2 and the switch tube S2 are connected with the output load LED2 in series;
the output branch 2 adopts negative feedback control based on the operational amplifier Op2, the reference signal of the same phase end is Vdim2, when the current sampling signal of the output branch 2 is smaller than Vdim2, the output current of the front-stage unidirectional current source Iin is increased, and when the current sampling signal of the output branch 2 is larger than Vdim2, the output current of the front-stage unidirectional current source Iin is reduced.
2. The dual-path cold and warm color temperature LED control circuit according to claim 1, wherein the output branch 1 and the output branch 2 are arranged in parallel and connected with the output of the unidirectional current source Iin in parallel, and the sampling resistor Rcs is located on the parallel circuit of the output branch 1 and the output branch 2 and the unidirectional current source Iin.
3. The dual-channel cold and warm color temperature LED control circuit according to claim 1, wherein the G end of the RS trigger of the current control circuit is connected with the control ends of the switching tubes S1 and Sb, the S end is connected with the unidirectional current source Iin, the R end is connected with the output end of the comparator Comp1,the end is connected with the control ends of the switching tubes Sa and S2, the input end of the comparator Comp1 is respectively connected with the output end of the operational amplifier Op1 and the Vdim signal, the two ends of the integrating capacitor Cint are connected with the input end and the output end of the operational amplifier Op1, the input end and the output end of the switching tube Sa are connected with the two ends of the integrating capacitor Cint in parallel, the input end of the operational amplifier Op1 is connected with the sampling resistor Rcs through the integrating resistor Rint, the two ends of the compensating capacitor Ccomp are connected with the input end and the output end of the operational amplifier Op2, the input end of the operational amplifier Op2 is respectively connected with the output end of the feedback resistor Rfb2 and the subtracter, and the feedback resistor Rfb1 is connected with the sampling resistor Rcs and the inverseThe feed resistor Rfb2 is connected in series, and the input end and the output end of the switch Sb are connected in parallel to the two ends of the feedback resistor Rfb1 and the sampling resistor Rcs.
4. The dual-channel cool-warm color temperature LED control circuit according to claim 3, wherein the current sampling signal of the sampling resistor Rcs charges and integrates the integrating capacitor Cint through the integrating resistor Rint, and when the voltage of the integrating capacitor Cint reaches the set voltage, the trigger is reset.
5. The dual-channel cold and warm color temperature LED control circuit of claim 1, wherein the formula for obtaining the Vdim2 value is as follows:
V dim2 ＝V ref -V dim
wherein Vdim2 represents the current reference of branch 2; vref represents the total current reference; vdim represents the current reference of branch 1.
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| JP2011009701A (en) * | 2009-05-19 | 2011-01-13 | Rohm Co Ltd | Drive circuit of light-emitting diode, light-emitting device and display device using the same, and method of protecting the same |
| CN105934029A (en) * | 2016-05-30 | 2016-09-07 | 西安电子科技大学 | Multi-path LED constant current drive circuit |
| CN205793476U (en) * | 2016-02-24 | 2016-12-07 | 西南交通大学 | A kind of bus current complementary time-sharing multiplex multiple constant current output LED drive power |
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| CN103490630B (en) * | 2013-09-16 | 2015-12-23 | 矽力杰半导体技术(杭州)有限公司 | For control circuit and the control method of staggered-parallel-type Switching Power Supply |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011009701A (en) * | 2009-05-19 | 2011-01-13 | Rohm Co Ltd | Drive circuit of light-emitting diode, light-emitting device and display device using the same, and method of protecting the same |
| CN205793476U (en) * | 2016-02-24 | 2016-12-07 | 西南交通大学 | A kind of bus current complementary time-sharing multiplex multiple constant current output LED drive power |
| CN105934029A (en) * | 2016-05-30 | 2016-09-07 | 西安电子科技大学 | Multi-path LED constant current drive circuit |
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