WO2019029068A1 - Circuit pilote de del et voyant lumineux électrique à del - Google Patents

Circuit pilote de del et voyant lumineux électrique à del Download PDF

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Publication number
WO2019029068A1
WO2019029068A1 PCT/CN2017/114957 CN2017114957W WO2019029068A1 WO 2019029068 A1 WO2019029068 A1 WO 2019029068A1 CN 2017114957 W CN2017114957 W CN 2017114957W WO 2019029068 A1 WO2019029068 A1 WO 2019029068A1
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WO
WIPO (PCT)
Prior art keywords
led
resistor
circuit
capacitor
module
Prior art date
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Ceased
Application number
PCT/CN2017/114957
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English (en)
Chinese (zh)
Inventor
何苗
许木桂
王成民
周海亮
王润
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Guangdong University of Technology
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Guangdong University of Technology
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Publication date
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Publication of WO2019029068A1 publication Critical patent/WO2019029068A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H05B45/345—Current stabilisation; Maintaining constant current
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • 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
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/375—Switched mode power supply [SMPS] using buck topology
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H05B45/54—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits in a series array of LEDs
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H05B45/56—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits involving measures to prevent abnormal temperature of the LEDs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H05B45/52—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits in a parallel array of LEDs

Definitions

  • the invention relates to the field of LED illumination, in particular to an LED driving circuit and an LED electrical indicator.
  • the LED electrical indicator has improved in quality compared to the electrical indicator light that uses filament heating as the light source.
  • the LED driving circuit of the existing LED electrical indicator is inferior, resulting in the quality and life of the LED electrical indicator. Decreased significantly.
  • the LED driving circuit includes a plurality of LED branches, each of which includes an LED string.
  • the current flowing through the faulty LED branch changes.
  • the current flowing through the other non-faulty LED branches also changes, so that the current flowing through the LED branches is not uniform.
  • the driving circuit in the prior art cannot balance the current flowing through the LED branches, so that the current flowing through the LED branches is uneven, which affects the illumination quality and life of the LED electrical indicator.
  • the failure rate of the LED electrical indicator is increased, and the safety factor and reliability of the LED electrical indicator are reduced.
  • the object of the invention is to provide an LED driving circuit and an LED electrical indicator light, which improves the luminous quality of the LED electrical indicator light, prolongs the life of the LED electrical indicator light, reduces the failure rate of the LED electrical indicator light, and increases the LED electrical quantity.
  • the safety factor and reliability of the indicator light is to provide an LED driving circuit and an LED electrical indicator light, which improves the luminous quality of the LED electrical indicator light, prolongs the life of the LED electrical indicator light, reduces the failure rate of the LED electrical indicator light, and increases the LED electrical quantity.
  • the present invention provides an LED driving circuit applied to an LED electrical indicator, comprising a power module and a circuit current sharing module, wherein the circuit current sharing module comprises N parallel LED branches of the same specification
  • Each of the LED branches includes an LED string, a triode, a base resistor and an emitter resistor, and N is an integer not less than 2, wherein:
  • a first end of the LED string is connected to an output positive end of the power module, and a second end of the LED string is respectively connected to a first end of a base resistor of the branch and a collector of the triode, a second end of the base resistor is connected to a base of the transistor, an emitter of the transistor is connected to a first end of the emitter resistor, and a second end of the emitter resistor is opposite to the power module
  • the output negative terminals are connected, and the first ends of the base resistances of the N said LED branches are connected to each other.
  • each of the LED branches further includes a sub-diode
  • the LED driving circuit further includes a total diode, wherein:
  • the positive ends of the sub-diodes are respectively connected to the second ends of the LED strings on the branch and the collectors of the transistors, and the negative ends of the sub-diodes on the N LED branches are connected to each other, and the common ends thereof
  • the positive terminals of the total diodes are connected, and the negative terminals of the total diodes are respectively connected to the first ends of the base resistances of the N of the LED branches.
  • the power module includes a circuit protection module, a circuit step-down module and a rectifier bridge, and the circuit protection module includes a first capacitor, a first resistor, and a negative temperature coefficient NTC resistor, wherein:
  • the first end of the first capacitor is respectively connected to the first end of the first resistor and the output positive end of the alternating current power source, and the second end of the first capacitor is respectively connected with the first end of the NTC resistor
  • the output negative end of the alternating current power supply is connected, the second end of the first resistor is connected to the input end of the circuit buck module, and the output end of the circuit buck module is connected to the input positive end of the rectifier bridge.
  • a second end of the NTC resistor is connected to an input negative end of the rectifier bridge, an output positive end of the rectifier bridge is used as an output positive end of the power module, and an output negative end of the rectifier bridge is used as the power module The negative end of the output.
  • the circuit buck module comprises a second resistor and a second capacitor, wherein:
  • a first end of the second resistor is connected to a first end of the second capacitor, a common end thereof is an input end of the circuit buck module, and a second end of the second resistor is opposite to the second capacitor The second end is connected and its common end serves as the output of the circuit buck module.
  • the power module further includes a third capacitor, a third resistor, and a fourth capacitor, wherein:
  • a first end of the third capacitor is respectively connected to a first end of the third resistor and an output positive end of the rectifier bridge, and a second end of the third resistor and a first end of the fourth capacitor Connected, the common end of which is the output positive end of the power module, and the second end of the third capacitor is respectively connected to the second end of the fourth capacitor and the output negative end of the rectifier bridge, and the common end thereof is The output negative end of the power module.
  • the circuit board on which the LED driving circuit is located is specifically a double layer board.
  • the circuit board is specifically a double-layered board that has been glued.
  • the LED driving circuit further comprises a circuit current stabilizing module, wherein the circuit current stabilizing module comprises a Zener diode and a positive temperature coefficient PTC resistor, wherein:
  • a positive terminal of the Zener diode is connected to an output negative end of the power module, and a negative terminal of the Zener diode is respectively connected to a first end of the PTC resistor and an output positive end of the power module, A second end of the PTC resistor is coupled to the first end of the LED string.
  • the present invention also provides an LED electrical indicator lamp, including any of the above LED driving circuits.
  • the LED electrical indicator light further comprises a heat sink.
  • the invention provides an LED driving circuit, which is applied to an LED electrical indicator light, comprising a power module and a circuit current sharing module.
  • the circuit current sharing module comprises N parallel LED branches of the same specification, each LED branch includes LED string, triode, base resistance and emitter resistance, N is an integer not less than 2, wherein: the first end of the LED string is connected to the positive end of the output of the power module, and the second end of the LED string is respectively associated with the branch on the branch
  • the first end of the base resistor is connected to the collector of the triode, the second end of the base resistor is connected to the base of the triode, the emitter of the triode is connected to the first end of the emitter resistor, and the second end of the emitter resistor is The output terminals of the power modules are connected to each other, and the first ends of the base resistors of the N LED branches are connected to each other.
  • the invention also provides an LED electrical indicator light having the same beneficial effects as the LED driving circuit described above.
  • FIG. 1 is a schematic structural view of an LED driving circuit provided by the present invention
  • FIG. 2 is a schematic structural view of another LED driving circuit provided by the present invention.
  • the core of the invention provides an LED driving circuit and LED electrical indicator light, which improves the luminous quality of the LED electrical indicator light, prolongs the life of the LED electrical indicator light, reduces the failure rate of the LED electrical indicator light, and increases the LED electrical The safety factor and reliability of the indicator light.
  • FIG. 1 is a schematic structural diagram of an LED driving circuit according to the present invention.
  • the LED driving circuit is applied to the LED electrical indicator light, and includes a power module 1 and a circuit current sharing module 2.
  • the circuit current sharing module 2 includes N parallel LED branches of the same specification, and each LED branch includes an LED string D. , the transistor Q, the base resistor R1 and the emitter resistor R2, N are integers not less than 2, wherein:
  • the first end of the LED string D is connected to the positive end of the output of the power module 1, and the second end of the LED string D
  • the terminals are respectively connected to the first end of the base resistor R1 and the collector of the transistor Q, and the second end of the base resistor R1 is connected to the base of the transistor Q, and the emitter and emitter resistor R2 of the transistor Q are respectively connected.
  • the first end is connected, the second end of the emitter resistor R2 is connected to the output negative end of the power module 1, and the first ends of the base resistor R1 of the N LED branches are connected to each other.
  • the LED driving circuit includes a power module 1 and a circuit current sharing module 2, and the LED driving circuit supplies power to the circuit current sharing module 2 through the power module 1.
  • the circuit current sharing module 2 includes a plurality of parallel LED branches. The specifications of each LED branch in the circuit current sharing module 2 should be the same in consideration of ensuring uniformity of current flowing through each LED branch.
  • the LED electrical indicator light includes N LED branches, and each LED branch includes an LED string D, a triode Q, a base resistor R1, and an emitter resistor R2.
  • the base resistor R1 acts as a bias resistor of the transistor Q, which causes the transistor Q to operate in an amplified state.
  • the base resistor R1 also serves as a base limit current resistor, which prevents the base current from being excessively large, thereby protecting the transistor Q from being burnt.
  • the emitter resistor R2 acts as a voltage detecting resistor. When the LED string D is short-circuited or disconnected, the current flowing through the emitter resistor R2 changes, and the voltage across the emitter resistor R2 also changes, thereby causing the emitter voltage to change. .
  • the circuit current sharing module 2 is used for equalizing and adjusting the current flowing through each LED branch. Specifically, when the LED string D of the partial LED branch is short-circuited, the voltage drop of the LED string D on the faulty LED branch is reduced, resulting in an increase in the base voltage of the triode Q on the faulty LED branch, due to the LED branches
  • the base of the transistor Q is connected through the base resistor R1, so the base voltage of the triode Q of other non-faulty LED branches is also increased, and because the emitters are connected together through the emitter resistor R2, they flow through the LEDs.
  • the base current of the transistor Q on the branch changes, resulting in a change in the collector current flowing through the transistor Q of each LED branch. Since the base voltages of the transistors Q are the same, and the emitter voltages of the transistors Q are the same, the voltages between the base and the emitter of each transistor Q are the same, that is, the parameters of the transistors Q match each other, thereby The collector current of each of the changed transistors Q is equalized to the same collector current flowing through the respective transistors Q, that is, the current flowing through the branches of the LEDs is uniform. When the LED string D of all LED branches is short-circuited, the LED electrical indicator does not work and the current flowing through each LED branch increases.
  • the invention provides an LED driving circuit, which is applied to an LED electrical indicator light, comprising a power module and a circuit current sharing module.
  • the circuit current sharing module comprises N parallel LED branches of the same specification, each LED branch includes LED string, triode, base resistance and emitter resistance, N is an integer not less than 2, wherein: the first end of the LED string is connected to the positive end of the output of the power module, and the second end of the LED string is respectively associated with the branch on the branch
  • the first end of the base resistor is connected to the collector of the triode, the second end of the base resistor is connected to the base of the triode, the emitter of the triode is connected to the first end of the emitter resistor, and the second end of the emitter resistor is The output terminals of the power modules are connected to each other, and the first ends of the base resistors of the N LED branches are connected to each other.
  • FIG. 2 is a schematic structural diagram of another LED driving circuit according to the present invention.
  • each of the LED branches further includes a sub-diode D1
  • the LED driving circuit further includes a total diode D2, wherein:
  • the positive terminal of the sub-diode D1 is respectively connected to the second end of the LED string D on the branch and the collector of the transistor Q, and the negative terminals of the sub-diode D1 on the N LED branches are connected to each other, and the common terminal and the total diode D2 are connected.
  • the positive terminals are connected to each other, and the negative terminals of the total diode D2 are respectively connected to the first ends of the base resistors R1 of the N LED branches.
  • a sub-diode D1 is added between the LED string D and the base resistor R1 of each LED branch, and all of the sub-diodes D1 and all of the base resistors R1 are connected by a total diode D2.
  • the volt-ampere characteristic of a diode is an exponential relationship between current and voltage.
  • the voltage changes slightly the current changes exponentially. Therefore, when the LED string D on the LED branch is short-circuited, the voltage of the LED string D changes, that is, the voltage of the sub-diode D1 of the branch thereof changes, and the current of the sub-diode D1 changes exponentially.
  • the sub-diode D1 and the total diode D2 correspond to a variable resistor, and as the current flowing through the sub-diode D1 and the total diode D2 increases, the resistance thereof increases, thereby reducing the current. Therefore, the presence of the sub-diode D1 and the total diode D2 prevents the increased current from falling all over the triode Q of each LED branch, thereby protecting the triode Q from being burned out.
  • the power module 1 includes a circuit protection module, a circuit step-down module, and a rectifier bridge.
  • the circuit protection module includes a first capacitor, a first resistor, and a NTC (Negative Temperature Coefficient) resistor, wherein:
  • the first end of the first capacitor is respectively connected to the first end of the first resistor and the positive end of the output of the alternating current power source, and the second end of the first capacitor is respectively connected with the first end of the NTC resistor and the output negative end of the alternating current power source, respectively
  • the second end of the resistor is connected to the input end of the circuit buck module, the output end of the circuit buck module is connected to the input positive end of the rectifier bridge, and the second end of the NTC resistor is connected to the input negative end of the rectifier bridge, and the rectifier bridge is connected
  • the positive terminal of the output is used as the output positive terminal of the power module 1
  • the negative terminal of the output of the rectifier bridge is used as the output negative terminal of the power module 1.
  • the power module 1 includes a circuit protection module, a circuit step-down module, and a rectifier bridge.
  • the circuit step-down module is configured to reduce the voltage of the alternating current power source
  • the rectifier bridge is configured to convert the alternating current power of the reduced-voltage alternating current power source into a direct current power.
  • the present application uses rectifier bridge rectification, which can effectively reduce the point of failure compared to discrete components.
  • the circuit protection module includes a first capacitor, a first resistor, and an NTC resistor. Specifically, considering that there is a lot of noise in the industrial power environment, the first capacitor is used to filter at the input end of the AC power source, thereby ensuring the stability of the AC power source. The first capacitor can also suppress the generation of common mode interference.
  • the first resistor acts as a protection resistor at the input of the AC power source to prevent the component from being burned when the voltage is too high.
  • the NTC resistor acts as an absorption surge component.
  • the initial resistance of the NTC resistor is large, which is equivalent to an open circuit, which suppresses the excessive current when the AC power supply is turned on, thereby protecting the LED drive circuit;
  • the circuit gradually enters the normal working state, as the current flowing through the NTC resistor increases, the temperature of the NTC resistor gradually increases, causing the resistance value of the NTC resistor to gradually decrease, so that the normal operation of the LED driving circuit is not affected. The effect of NTC resistance.
  • the circuit buck module includes a second resistor and a second capacitor, wherein:
  • the first end of the second resistor is connected to the first end of the second capacitor, the common end of which is the input end of the circuit buck module, and the second end of the second resistor is connected to the second end of the second capacitor, the common end of which is The output of the circuit buck module.
  • the circuit buck module herein includes a second resistor and a second capacitor connected in parallel with the second resistor, and the second capacitor is stepped down, and the step-down efficiency is high.
  • the resistance of the second resistor is large.
  • the LED driving circuit When the LED driving circuit operates, most of the current flows into the second capacitor, and the second capacitor stores the amount of electricity.
  • the second resistor When the LED driving circuit is powered off, the second resistor is connected in parallel with the second resistor. The second capacitor forms a loop, and the amount of electricity stored in the second capacitor is released through the second resistor to prevent excessive voltage from burning out other components.
  • the power module 1 further includes a third capacitor, a third resistor, and a fourth capacitor, wherein:
  • the first end of the third capacitor is respectively opposite to the first end of the third resistor and the output positive end of the rectifier bridge
  • the second end of the third resistor is connected to the first end of the fourth capacitor, the common end of which is the output positive end of the power module 1, and the second end of the third capacitor and the second end of the fourth capacitor and the rectifier bridge respectively
  • the output negative terminal is connected, and its common terminal serves as the output negative terminal of the power module 1.
  • the third resistor is used for current limiting protection
  • the third capacitor is used as a low frequency rectifying filter capacitor for filtering the output signal of the rectifier bridge
  • the fourth capacitor is used as a high frequency filter capacitor
  • the third is the output signal of the power module 1 more stable.
  • the circuit board on which the LED drive circuit is located is specifically a two-layer board.
  • the circuit board where the LED driving circuit is located uses a double-layer board.
  • the double-layer board can arrange electronic components on both sides, thereby reducing the occupied space and satisfying the national limit standard for the LED electrical indicator size;
  • the collector current of the triode Q of the faulty LED branch is relatively large, and the double-layer board contributes to heat dissipation of the LED driving circuit, thereby preventing the triode Q of the faulty LED branch from being burned out.
  • the circuit board is specifically a double-layered board that has been glued.
  • the circuit board is glued to enhance the ability of dust, moisture, and electric shock to adapt to complex industrial environments.
  • the LED driving circuit further includes a circuit current stabilizing module including a Zener diode and a PTC (Positive Temperature Coefficient) resistor, wherein:
  • the positive terminal of the Zener diode is connected to the output negative terminal of the power module 1, and the negative terminal of the Zener diode is respectively connected to the first end of the PTC resistor and the output positive terminal of the power module 1, and the second end of the PTC resistor and the LED string D The first end is connected.
  • the Zener diode and the PTC resistor provide a stable current for the circuit current sharing module 2.
  • the Zener diode provides a stable voltage for the circuit current sharing module 2
  • the PTC resistor is used as the current adjustment component, and the current flowing through the PTC resistor increases.
  • the temperature of the PTC resistor rises, which causes the resistance value of the PTC resistor to increase and lower the current.
  • the temperature of the PTC resistor decreases, thereby causing the resistance value of the PTC resistor to decrease. Small, increasing the current.
  • the invention also provides an LED electrical indicator light comprising any of the above LED drive circuits.
  • LED driving circuit in the LED electrical indicator provided by the present invention, please refer to the above LED driving circuit embodiment, and the present invention will not be described herein.
  • the LED electrical indicator lamp further includes a lamp cap and a lamp post.
  • the circuit board where the LED drive circuit is located is loaded from the lamp cap, and the lamp post has four clip slots, and the four clip slots are used for fixing the circuit board, and the installation is simple. practical.
  • the two terminals of the LED electrical indicator light have a wire hole. When the circuit board is installed, the two main power wires pass through the wire hole and are soldered to the terminal, and then the power cable of the LED disk is soldered.
  • the LED electrical indicator light also includes a heat sink.

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  • General Engineering & Computer Science (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
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Abstract

L'invention porte sur un circuit pilote de DEL et un voyant lumineux électrique à DEL, comprenant un module d'alimentation électrique (1) et un module de partage de courant de circuit (2). Le module de partage de courant de circuit comprend N branches à DEL reliées en parallèle et de même spécification. Les branches à DEL comprennent chacun une chaîne de DEL (D), une triode (Q), une résistance d'électrode de base (R1) et une résistance d'électrode d'émetteur (R2), N étant un entier supérieur ou égal à 2. Une première extrémité de la chaîne de DEL est reliée à une extrémité de sortie positive du module d'alimentation électrique, une deuxième extrémité de la chaîne de DEL est reliée respectivement à une première extrémité de la résistance d'électrode de base de la branche sur laquelle elle est située et à une électrode de collecteur de la triode, une deuxième extrémité de la résistance d'électrode de base est reliée à une électrode de base de la triode, une électrode d'émetteur de la triode est reliée à une première extrémité de la résistance d'électrode d'émetteur, une deuxième extrémité de la résistance d'électrode d'émetteur est reliée à une extrémité de sortie négative du module d'alimentation électrique, et les premières extrémités des résistances d'électrode de base sur les N branches à DEL sont reliées les unes aux autres. Le circuit pilote permet de prolonger la durée de vie utile du voyant lumineux électrique à DEL, d'en réduire le taux de défaillance et d'en améliorer la fiabilité.
PCT/CN2017/114957 2017-08-10 2017-12-07 Circuit pilote de del et voyant lumineux électrique à del Ceased WO2019029068A1 (fr)

Applications Claiming Priority (2)

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CN201710680285.1A CN107295721B (zh) 2017-08-10 2017-08-10 一种led驱动电路及led电气指示灯
CN201710680285.1 2017-08-10

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WO2019029068A1 true WO2019029068A1 (fr) 2019-02-14

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CN201611970U (zh) * 2010-02-04 2010-10-20 深圳市麦格米特电气技术有限公司 一种新型多路led恒流驱动电路
CN107295721A (zh) * 2017-08-10 2017-10-24 广东工业大学 一种led驱动电路及led电气指示灯

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Publication number Priority date Publication date Assignee Title
CN112584581A (zh) * 2020-12-24 2021-03-30 联晶智能电子有限公司 一种led负载均流保护电路

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