CN103269551A - Multi-segment-type cascading driving circuit - Google Patents
Multi-segment-type cascading driving circuit Download PDFInfo
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- CN103269551A CN103269551A CN2013102274355A CN201310227435A CN103269551A CN 103269551 A CN103269551 A CN 103269551A CN 2013102274355 A CN2013102274355 A CN 2013102274355A CN 201310227435 A CN201310227435 A CN 201310227435A CN 103269551 A CN103269551 A CN 103269551A
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Abstract
The invention provides a multi-segment-type cascading driving circuit which comprises a power module, a plurality of control modules sequentially connected onto an output line of the power module, a plurality of load modules sequentially connected in series on the output line of the power module and correspondingly connected with the plurality of control modules as well as controlled by the corresponding control modules to run, and a plurality of switching modules connected between the corresponding control modules and the load modules and used for controlling the load modules to run through commands of the control modules, wherein the output terminal of the control module which is lastly connected to the output line of the power module is connected with a stable resistor; each switching module is formed by MOS (Metal Oxide Semiconductor) field effect transistors; each load module is formed by light emitting diodes; a current-limiting resistor is connected between the power module and each MOS field effect transistor; and the sequence of the plurality of control modules connected to the output line is opposite to the sequence of the plurality of correspondingly-controlled load modules on the output line. As the multi-segment-type cascading driving circuit is used, the efficiency and the power factor of a power supply are improved.
Description
Technical field
The present invention relates to the led drive circuit technical field, be specially a kind of multisection type cascade drive circuit.
Background technology
Light-emitting diode (Light Emitting Diode, be called for short LED) is a kind of mat applied voltage excitation electron and radiate the optoelectronic semiconductor component of bright dipping, has advantages such as low in energy consumption, that brightness is high, the life-span is long, size is little.The previous typical high light flux LED device of order can produce several lumens to the luminous flux of tens of lumens.The design of upgrading can be adopt a plurality of LED strings and the cascade combination, a plurality of devices namely are installed in single assembly, also can be in a device integrated more LED, thereby make the lumen number of output be equivalent to miniature incandescent lamps.For example, high-power 12 chip monochromatic LED devices can be exported the light energy of 200 lumens, and the power that consumes is between 10 to 15 watts.LED has been widely used in the various lighting apparatus, as battery powered photoflash lamp, miniature acoustic control lamp, safety flare, indoor and outdoor road and stair illuminating lamp and building and mark continuous illumination lamp.But a plurality of LED strings cascaded series also is fashionable driving, because drive condition has nothing in common with each other, gives the operation of LED lamp group, and control and maintenance have brought inconvenience.
The drive circuit of LED is very different now, have in order to reduce cost, it is very simple that circuit is done, power factor is only accomplished about 0.5, luminous efficiency is very low, can't satisfy on the market the demand of efficient saving product, have in order to pursue high performance requirements, circuit is very complicated, use restricted devices such as a large amount of electrochemical capacitors and inductance, cost improves greatly, and the circuit of different product is also inequality, and the development difficulty of circuit is also bigger, increased the development time, because complex circuit, the volume of product is relatively large, influences the global design of light fixture product.So simplicity of design, high performance power supply are very important.
As shown in Figure 1, be shown as the general topology of present LED Linear Driving.Comprise power module 11', control module 12', comprise the load blocks 13' of some LED and the switch module 14' of some switches etc.For example, as shown in Figure 1, its driving control mode is: when reaching the voltage of first section LED D1, switch Q1 opens ground connection, makes LED D1 conducting over the ground, when reaching the voltage of second section LED D2, switch Q1 disconnects, switch Q2 opens ground connection, makes LED D1 and LED D2 conducting over the ground, when reaching the voltage of the 3rd section LED D3, switch Q1, switch Q2 disconnects, and switch Q3 opens ground connection, makes LED D1, LED D2 and LED D3 conducting over the ground, when reaching the voltage of the 4th section LED D4, switch Q1, switch Q2 and switch Q3 disconnect, switch Q4 opens ground connection, make LED D1, LED D2, LED D3 and LED D4 conducting over the ground simultaneously.
By this control mode, can improve efficient and the power factor of power supply, power-efficient can accomplish 0.88, power factor is greater than 0.95, THD(Total Harmonic Distortion, total harmonic distortion) less than 20%.
Present main expansion mode to above-mentioned LED Linear Driving as shown in Figure 2, it is simple in parallel to be mainly control module 12' part, is equivalent to have 1～n control module 12' parallel connection, respectively driving corresponding LED separately.Because the major parameters such as power-efficient, power factor and THD of the Linear Driving circuit of LED determine by driving control now, if power-efficient, power factor and the THD of selected its entire circuit of drive control part determine, because it is simply in parallel that its expansion mode shown in Fig. 2 is mainly drive control part, circuit parameter can not change.
Summary of the invention
The shortcoming of prior art the object of the present invention is to provide a kind of multisection type cascade drive circuit in view of the above, is used for improving efficient and the power factor of prior art power supply.
Reach other relevant purposes for achieving the above object, the invention provides a kind of multisection type cascade drive circuit, comprising: power module; A plurality of control modules are connected in turn on the outlet line of power module; A plurality of load blocks are connected on the outlet line of power module successively, and corresponding connection with a plurality of control modules, by the control module control operation of correspondence; A plurality of switch modules are connected between the corresponding control module and load blocks, the operation of the order control load module by control module.
Preferably, an end of described control module is connected on the outlet line of power module, and the other end links to each other with an end of switch module; One end of described load blocks is connected on the outlet line, and the other end links to each other with an other end of described switch module.
Preferably, last output that is connected the control module on the outlet line of power module is connected with steady resistance.
Preferably, described switch module is made of metal-oxide-semiconductor field effect transistor, and described load blocks is made of light-emitting diode.
Preferably, all be connected with current-limiting resistance between described power module and each metal-oxide-semiconductor field effect transistor.
Preferably, a plurality of control modules are connected the reversed in order of a plurality of load blocks on outlet line of order and corresponding control on the outlet line.
Preferably, switch module is introduced the corresponding control module of this switch module through the control module of front successively.
Preferably, the quantity of described control module is at least two.
As mentioned above, a kind of multisection type cascade drive circuit of the present invention has following beneficial effect:
1, the present invention is that control module with Linear Driving is connected in series, when detecting the power input voltage variation, control module can be according to the height of input voltage, control opening and closing of different switching tubes, different LED is operated under the different operating states, and can controls the electric current of every paths of LEDs by the current-limiting resistance that links to each other with metal-oxide-semiconductor field effect transistor.Thereby the mode of cascade of the present invention, the control module of any multistage can be carried out cascade according to the needs of input voltage and product, to reach the design requirement of product.
2, the present invention is because a plurality of control mode that adopted cascade, the conducting of LED is rendered as more multistage, and LED conducting voltage curve and the match more of input voltage curve are so the power factor of power supply can be higher, THD also can be littler, and power-efficient also can be higher.
3, the present invention is because a plurality of control mode that adopted cascade, the more refinement of the ON time of LED, and when accepting the PWM dim signal, LED is when turn-offing to conducting, and the response time of LED can be shorter, so dimming characteristic is better.
4, since the present invention owing to adopted the control mode of cascade, so the conducting of LED is rendered as more multistage, the more refinement of the ON time of LED can improve the utilance of LED.
5, circuit of the present invention connects very simple, and realizes easily, and the control mode by this cascade, can improve efficient and the power factor of power supply, and power-efficient can accomplish 0.95, power factor greater than 0.99, THD less than 10%.
Description of drawings
Fig. 1 is shown as the general topology schematic diagram of LED Linear Driving in the prior art.
Fig. 2 is shown as the structural representation of a kind of multisection type cascade drive circuit in the prior art.
Fig. 3 is shown as the structural representation of a kind of multisection type cascade drive circuit of the present invention.
Fig. 4 is shown as the control schematic diagram of a kind of multisection type cascade drive circuit of the present invention.
The element numbers explanation
1
11', 11 power modules
12', 12 control modules
13', 13 load blocks
14', 14 switch modules
15 steady resistances
Embodiment
Below by particular specific embodiment explanation embodiments of the present invention, person skilled in the art scholar can understand other advantages of the present invention and effect easily by the disclosed content of this specification.
Notice, the appended graphic structure that illustrates of this specification, ratio, size etc., equal contents in order to cooperate specification to disclose only, understand and reading for person skilled in the art scholar, be not in order to limit the enforceable qualifications of the present invention, so technical essential meaning of tool not, the adjustment of the modification of any structure, the change of proportionate relationship or size, not influencing under the effect that the present invention can produce and the purpose that can reach, all should still drop on disclosed technology contents and get in the scope that can contain.Simultaneously, quote in this specification as " on ", D score, " left side ", " right side ", " centre " reach the term of " " etc., also only for ease of understanding of narrating, but not in order to limit the enforceable scope of the present invention, the change of its relativeness or adjustment, under no essence change technology contents, when also being considered as the enforceable category of the present invention.
The invention provides a kind of multisection type cascade drive circuit, be used for improving efficient and the power factor of prior art power supply.Below will elaborate principle and the execution mode of a kind of multisection type cascade drive circuit of the present invention, and make those skilled in the art not need creative work can understand a kind of multisection type cascade drive circuit of the present invention.
See also Fig. 3, be shown as the structural representation of a kind of multisection type cascade of the present invention drive circuit.As shown in Figure 3, the multisection type cascade drive circuit among the present invention comprises: power module 11, a plurality of control module 12, a plurality of load blocks 13 and a plurality of switch module 14.
The quantity of described control module 12 is at least two, and a plurality of control modules 12 are connected in turn on the outlet line of power module 11.
Particularly, in the present embodiment, an end of described control module 12 is connected on the outlet line of power module 11, and the other end links to each other with an end of switch module 14; One end of described load blocks 13 is connected on the outlet line, and the other end links to each other with an other end of described switch module 14.
In the present embodiment simultaneously, last output that is connected the control module 12 on the outlet line of power module 11 is connected with steady resistance 15.
Particularly, in the present embodiment, described control module 12 comprises bleeder circuit, single-chip microcomputer, comparator, counter and logic control output module.
Bleeder circuit of the present invention links to each other with power module 11, to analyzing from the voltage of power module 11 outputs, determines whether to exist overvoltage, and is determining to control protection after the overvoltage.
Described bleeder circuit carries out dividing potential drop to the voltage of power module 11 outputs; Particularly, in the present embodiment, described bleeder circuit comprises first divider resistance and second divider resistance of series connection, draws output from the middle connecting line of first divider resistance and second divider resistance.
Generally, also be connected with current rectifying and wave filtering circuit between described bleeder circuit and the described power module 11.Specifically current rectifying and wave filtering circuit chooses to be known by those skilled in the art.In the present embodiment, choosing current rectifying and wave filtering circuit conventional in the prior art gets final product.
The branch pressure voltage that the Vesnse pin of described single-chip microcomputer links to each other with the output of described bleeder circuit, described bleeder circuit is exported is introduced in the single-chip microcomputer.Introduce in the single-chip microcomputer by the branch pressure voltage that the Vesnse pin is exported described bleeder circuit; just can analyze the voltage of introducing by single-chip microcomputer; determine whether to exist overvoltage, when overvoltage, single-chip microcomputer also can be exported the control signal of carrying out protective circuit simultaneously.
The Vcc pin of single-chip microcomputer inserts on the outlet line of power module 11 through pull-up resistor.
Particularly; in the present invention; the mode that can adopt the comparator sum counter of single-chip microcomputer inside to combine comes monitoring input voltage whether to have overvoltage; avoided the trouble of a lot of peripheral circuits that available technology adopting links to each other with single-chip microcomputer; this shows; control module 12 of the present invention has also realized overvoltage protection in the control to load blocks 13, reached the purpose of having simplified circuit structure simultaneously again.
Particularly, described comparator is positioned at single-chip microcomputer inside, links to each other with described Vesnse pin, and the branch pressure voltage of described Vesnse pin introducing and the reference voltage of single-chip microcomputer inside are compared; Described comparator is exported first comparative result when branch pressure voltage is higher than the reference voltage of single-chip microcomputer inside, export second comparative result when branch pressure voltage is lower than the reference voltage of single-chip microcomputer inside.Described comparator is input to first comparative result or second comparative result in the described counter.
Described counter places described single-chip microcomputer inside, links to each other with described comparator, and described counter begins counting when receiving first comparative result, export first count results, and described counter begins counting when receiving second comparative result, export first count results.
Described logic control output module also is arranged in described single-chip microcomputer, and link to each other with described counter, when described first count results reaches default first numerical value, adjust the reference voltage of single-chip microcomputer inside and export open command, so that the switch module that links to each other with load disconnection.Or described logic control output module is adjusted the reference voltage of single-chip microcomputer inside and is exported turn-on command so that switch module 14 conductings that link to each other with load blocks 13 when described second count results reaches default second value.
The present invention is by the mode of employing rolling counters forward, and when the numerical value that counter is counted reached certain numerical value, there was overvoltage in affirmation again, thereby can effectively prevent from causing judging by accident the disconnected phenomenon of by mistake protecting because of the voltage fluctuation of accidentalia appearance.
In addition, in the present embodiment, described logic control output module is as follows to the control of described counter:
Described logic control output module control counter when described first count results does not reach default first numerical value or when second count results does not reach default second value stops counting.
Described counter makes zero first count results when receiving second comparative result, when receiving first comparative result, second count results is made zero.And after described counter stopped counting, described counter restarted counting when receiving first comparative result or second comparative result again.
Particularly, the control of described logic control output module protection process is as follows:
Described logic control output module is when judging that described first count results reaches default first numerical value, described logic control output module enters into the overvoltage control model, the reference voltage that described logic control output module is adjusted single-chip microcomputer inside diminishes output current, thereby the switch module 14 that links to each other with load blocks 13 is disconnected.When if described first count results does not reach default first numerical value, described logic control output module is controlled described counter and is stopped counting, if occur high voltage again, described counter is counted again, to prevent the appearance of mistake protection.
After described logic control output module enters into the overvoltage control model, if described counter is received second comparative result of described comparator output, described counter begins counting, export second count results, when rolling counters forward reaches the second value of setting, described logic control output module enters the normal voltage control model, the reference voltage that described logic control output module is adjusted single-chip microcomputer inside makes output current recover normal, thereby makes switch module 14 conductings that link to each other with load blocks 13.If described counter does not reach set point, described logic control output module is controlled described counter and is stopped counting, if occur low-voltage again, described counter recomputates, to prevent the appearance of misoperation.
A plurality of load blocks 13 are connected on the outlet line of power module 11 successively, and with a plurality of control module 12 corresponding connections, by the control module 12 control operation of correspondence.Further, in the present embodiment, as shown in Figure 3, a plurality of control modules 12 are connected the reversed in order of a plurality of load blocks 13 on outlet line of order and corresponding control on the outlet line.
A plurality of switch modules 14 are connected between the corresponding control module 12 and load blocks 13, the operation of the order control load module 13 by control module 12.
In the present embodiment, switch module 14 can be introduced the corresponding control module of this switch module through the control module 12 of front successively.
Particularly, in the present embodiment, described switch module 14 is made of metal-oxide-semiconductor field effect transistor, and described load blocks 13 is made of light-emitting diode (LED).Light-emitting diode of the corresponding control of each metal-oxide-semiconductor field effect transistor.
In the present embodiment, particularly, all be connected with current-limiting resistance between described power module 11 and each metal-oxide-semiconductor field effect transistor.
Adopt aforesaid cascade control mode, the conducting of LED is rendered as more multistage, LED conducting voltage curve and the match more of input voltage curve, so the power factor of power supply can be higher, THD also can be littler, and power-efficient also can be higher; The more refinement of ON time of LED simultaneously, when accepting the PWM dim signal, LED is when turn-offing to conducting, the response time of LED can be shorter, so dimming characteristic is better, just because of the conducting of LED is rendered as more multistage, the more refinement of the ON time of LED can improve the utilance of LED.
The present invention is that the control module 12 with Linear Driving is connected in series, when detecting the power input voltage variation, control circuit can be according to the height of input voltage, control opening and closing of different switches (metal-oxide-semiconductor field effect transistor), different LED is operated under the different operating states, and can controls the electric current of every paths of LEDs by the current-limiting resistance that links to each other with metal-oxide-semiconductor field effect transistor.Thereby the mode of cascade of the present invention, the control module 12 of any multistage can be carried out cascade according to the needs of input voltage and product, to reach the design requirement of product.
Be cascaded as example with two control modules 12 and describe, as shown in Figure 4, be shown as the control schematic diagram of a kind of multisection type cascade drive circuit of the present invention.The driving control procedure of this multisection type cascade drive circuit is as follows:
When reaching first section LED(light-emitting diode) during the voltage of D1, metal-oxide-semiconductor field effect transistor Q1 opens ground connection, make LEDD1 conducting over the ground, when reaching the voltage of second section LED D2, metal-oxide-semiconductor field effect transistor Q1 disconnects, metal-oxide-semiconductor field effect transistor Q2 opens ground connection, make LED D1 and LED D2 conducting over the ground, when reaching the voltage of the 3rd section LED D3, metal-oxide-semiconductor field effect transistor Q1, metal-oxide-semiconductor field effect transistor Q2 disconnects, metal-oxide-semiconductor field effect transistor Q3 opens ground connection, make LED D1, LED D2 and LEDD3 conducting over the ground, when reaching the voltage of the 4th section LED D4, metal-oxide-semiconductor field effect transistor Q1, metal-oxide-semiconductor field effect transistor Q2 and metal-oxide-semiconductor field effect transistor Q3 disconnect, metal-oxide-semiconductor field effect transistor Q4 opens ground connection, make LED D1, LED D2, LED D3 and LEDD4 conducting over the ground, when reaching the voltage of the 5th section LED D5, metal-oxide-semiconductor field effect transistor Q5 opens ground connection, metal-oxide-semiconductor field effect transistor Q1～metal-oxide-semiconductor field effect transistor Q4 disconnects, make LED D1～LED D5 conducting over the ground, when reaching the voltage of the 6th section LED D6, metal-oxide-semiconductor field effect transistor Q1～metal-oxide-semiconductor field effect transistor Q5 disconnects, metal-oxide-semiconductor field effect transistor Q6 opens ground connection, make LEDD1～LED D6 conducting over the ground, when reaching the voltage of the 7th section LED D7, metal-oxide-semiconductor field effect transistor Q1～metal-oxide-semiconductor field effect transistor Q6 disconnects, metal-oxide-semiconductor field effect transistor Q7 opens ground connection, make LED D1～LED D7 conducting over the ground, when reaching the voltage of the 8th section LED D8, metal-oxide-semiconductor field effect transistor Q1～metal-oxide-semiconductor field effect transistor Q7 disconnects, metal-oxide-semiconductor field effect transistor Q8 opens ground connection, make LEDD1～LED D8 conducting over the ground simultaneously, by this control mode, can improve efficient and the power factor of power supply, control mode by this cascade, power-efficient can accomplish 0.95, power factor greater than 0.99, THD less than 10%.
The present invention can carry out cascade to two each and every one and plural control modules 12, to reach more preferably circuit parameter by the control mode of this cascade.
In sum, a kind of multisection type cascade drive circuit of the present invention has following beneficial effect:
1, the present invention is that control module with Linear Driving is connected in series, when detecting the power input voltage variation, control module can be according to the height of input voltage, control opening and closing of different switching tubes, different LED is operated under the different operating states, and can controls the electric current of every paths of LEDs by the current-limiting resistance that links to each other with metal-oxide-semiconductor field effect transistor.Thereby the mode of cascade of the present invention, the control module of any multistage can be carried out cascade according to the needs of input voltage and product, to reach the design requirement of product.
2, the present invention is because a plurality of control mode that adopted cascade, the conducting of LED is rendered as more multistage, and LED conducting voltage curve and the match more of input voltage curve are so the power factor of power supply can be higher, THD also can be littler, and power-efficient also can be higher.
3, the present invention is because a plurality of control mode that adopted cascade, the more refinement of the ON time of LED, and when accepting the PWM dim signal, LED is when turn-offing to conducting, and the response time of LED can be shorter, so dimming characteristic is better.
4, since the present invention owing to adopted the control mode of cascade, so the conducting of LED is rendered as more multistage, the more refinement of the ON time of LED can improve the utilance of LED.
5, circuit of the present invention connects very simple, and realizes easily, and the control mode by this cascade, can improve efficient and the power factor of power supply, and power-efficient can accomplish 0.95, power factor greater than 0.99, THD less than 10%.
So the present invention has effectively overcome various shortcoming of the prior art and the tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not is used for restriction the present invention.Any person skilled in the art scholar all can be under spirit of the present invention and category, and above-described embodiment is modified or changed.Therefore, have in the technical field under such as and know that usually the knowledgeable modifies or changes not breaking away from all equivalences of finishing under disclosed spirit and the technological thought, must be contained by claim of the present invention.
Claims (8)
1. a multisection type cascade drive circuit is characterized in that, comprising:
Power module;
A plurality of control modules are connected in turn on the outlet line of power module;
A plurality of load blocks are connected on the outlet line of power module successively, and corresponding connection with a plurality of control modules, by the control module control operation of correspondence;
A plurality of switch modules are connected between the corresponding control module and load blocks, the operation of the order control load module by control module.
2. multisection type cascade drive circuit according to claim 1 is characterized in that, an end of described control module is connected on the outlet line of power module, and the other end links to each other with an end of switch module; One end of described load blocks is connected on the outlet line, and the other end links to each other with an other end of described switch module.
3. multisection type cascade drive circuit according to claim 1 is characterized in that, last output that is connected the control module on the outlet line of power module is connected with steady resistance.
4. multisection type cascade drive circuit according to claim 1 is characterized in that described switch module is made of metal-oxide-semiconductor field effect transistor, and described load blocks is made of light-emitting diode.
5. multisection type cascade drive circuit according to claim 1 is characterized in that, all is connected with current-limiting resistance between described power module and each metal-oxide-semiconductor field effect transistor.
6. multisection type cascade drive circuit according to claim 1 is characterized in that, a plurality of control modules are connected the reversed in order of a plurality of load blocks on outlet line of order and corresponding control on the outlet line.
7. multisection type cascade drive circuit according to claim 1 is characterized in that, switch module is introduced the corresponding control module of this switch module through the control module of front successively.
8. multisection type cascade drive circuit according to claim 1 is characterized in that, the quantity of described control module is at least two.
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| CN201310227435.5A CN103269551B (en) | 2013-06-07 | 2013-06-07 | A kind of multisection type cascade drive circuit |
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| CN201310227435.5A CN103269551B (en) | 2013-06-07 | 2013-06-07 | A kind of multisection type cascade drive circuit |
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| CN103269551B CN103269551B (en) | 2015-08-19 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103857155A (en) * | 2014-04-04 | 2014-06-11 | 开源集成电路(苏州)有限公司 | Linear tandem switch LED lighting driving circuit and method |
| CN107493635A (en) * | 2017-09-22 | 2017-12-19 | 浙江晶日照明科技有限公司 | A kind of more pixel drive systems of LED |
| CN109041350A (en) * | 2018-09-06 | 2018-12-18 | 上海斯望照明科技有限公司 | A kind of DC power control method |
| CN113597053A (en) * | 2021-07-26 | 2021-11-02 | 南昌大学 | LED drive circuit |
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| US20030025120A1 (en) * | 2001-08-03 | 2003-02-06 | Koninklijke Philips Electronics N.V. | Integrated LED driving device with current sharing for multiple LED strings |
| CN102811538A (en) * | 2012-07-24 | 2012-12-05 | 上海亚明照明有限公司 | Driving circuit for light emitting diode (LED) module |
| CN103124463A (en) * | 2013-01-24 | 2013-05-29 | 石崇源 | LED lighting device with high power factor |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20030025120A1 (en) * | 2001-08-03 | 2003-02-06 | Koninklijke Philips Electronics N.V. | Integrated LED driving device with current sharing for multiple LED strings |
| CN102811538A (en) * | 2012-07-24 | 2012-12-05 | 上海亚明照明有限公司 | Driving circuit for light emitting diode (LED) module |
| CN103124463A (en) * | 2013-01-24 | 2013-05-29 | 石崇源 | LED lighting device with high power factor |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103857155A (en) * | 2014-04-04 | 2014-06-11 | 开源集成电路(苏州)有限公司 | Linear tandem switch LED lighting driving circuit and method |
| CN107493635A (en) * | 2017-09-22 | 2017-12-19 | 浙江晶日照明科技有限公司 | A kind of more pixel drive systems of LED |
| CN109041350A (en) * | 2018-09-06 | 2018-12-18 | 上海斯望照明科技有限公司 | A kind of DC power control method |
| CN109041350B (en) * | 2018-09-06 | 2021-03-05 | 上海斯望照明科技有限公司 | Direct-current power supply control method |
| CN113597053A (en) * | 2021-07-26 | 2021-11-02 | 南昌大学 | LED drive circuit |
| CN113597053B (en) * | 2021-07-26 | 2022-10-14 | 南昌大学 | LED drive circuit |
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|---|---|
| CN103269551B (en) | 2015-08-19 |
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