CN212463587U

CN212463587U - LED light-emitting drive circuit and air conditioner

Info

Publication number: CN212463587U
Application number: CN202020988740.1U
Authority: CN
Inventors: 杨帅; 陈建兵; 牛建勇; 刘思聪
Original assignee: Hisense Shandong Air Conditioning Co Ltd
Current assignee: Hisense Shandong Air Conditioning Co Ltd
Priority date: 2020-06-02
Filing date: 2020-06-02
Publication date: 2021-02-02
Anticipated expiration: 2030-06-02

Abstract

The utility model relates to the field of electronic technology, a LED light-emitting drive circuit and air conditioner is disclosed, LED light-emitting drive circuit includes: the LED driving circuit comprises a first power supply input end, a second power supply input end, a protection circuit and N LED branches, wherein N is more than or equal to 1; the second power input end is connected with the input end of the protection circuit, the output end of the protection circuit is connected with the input end of the LED branch, and the output end of the LED branch is connected with the first power input end. The utility model provides a LED luminous drive circuit has improved the stability of LED lamp current and irradiance, arouses the risk of LED lamp life-span damage when having avoided input voltage fluctuation.

Description

LED light-emitting drive circuit and air conditioner

Technical Field

The utility model relates to the field of electronic technology, especially, relate to a luminous drive circuit of LED and air conditioner.

Background

At present, an ultraviolet LED lamp plays an important role in the sterilization and disinfection functions of an air conditioner, the price of the ultraviolet LED is high, the driving current of the ultraviolet LED lamp is large and is about 100-120 mA as the voltage drop of the ultraviolet LED lamp is higher than that of a common LED lamp, and the ultraviolet LED lamp serving as an LED device has the obvious defect of being sensitive to voltage and current, so when voltage and current fluctuate, light decay is easy to accelerate, and the service life is influenced.

In the existing circuit, a plurality of ultraviolet LED lamps need to be driven in a group of general driving circuits, when one of the ultraviolet LED lamps is damaged or broken, other ultraviolet LED lamps cannot work normally, and the driving mode of the ultraviolet LED lamps usually adopts a constant voltage mode, i.e., power voltage and resistance are provided for current limiting, but when voltage fluctuates, the current of the ultraviolet LED lamp bead also changes, which affects the service life and irradiance fluctuation of the ultraviolet LED lamp bead.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a LED luminescence drive circuit and air conditioner has improved the stability of LED lamp current and irradiance, arouses the risk of LED lamp life-span damage when having avoided input voltage fluctuation.

The utility model provides a LED light-emitting drive circuit, which comprises a first power input end, a second power input end, a protection circuit and N LED branches, wherein N is more than or equal to 1;

the second power supply input end is connected with the input end of the protection circuit, the output end of the protection circuit is connected with the input end of the LED branch circuit, and the output end of the LED branch circuit is connected with the first power supply input end;

the LED branch circuit comprises a first filter capacitor, a first light emitting diode, a first triode, a second triode, a first resistor, a second resistor, a third resistor and a first voltage end;

the first end of the first filter capacitor is the input end of the LED branch circuit, the second end of the first filter capacitor is the output end of the LED branch circuit, and the first voltage end is connected with the first end of the first filter capacitor;

the anode of the first light emitting diode is connected with the first end of the first filter capacitor, the cathode of the first light emitting diode is connected with the collector of the first triode, the emitter of the first triode is connected with the first end of the second resistor, the base of the first triode is connected with the collector of the second triode, and the second end of the second resistor is connected with the second end of the first filter capacitor;

the first end of the first resistor is connected with the first end of the first filter capacitor, the second end of the first resistor is connected with the collector of the second triode, the base of the second triode is connected with the emitter of the first triode, the emitter of the second triode is connected with the first end of the third resistor, and the second end of the third resistor is grounded.

Preferably, the protection circuit includes a diode;

the anode of the diode is the input end of the protection circuit, and the cathode of the diode is the output end of the protection circuit.

Preferably, the first triode and the second triode are both NPN-type triodes.

Preferably, the first light emitting diode is an ultraviolet LED.

The utility model also provides an air conditioner, including foretell LED drive circuit that gives out light.

The embodiment of the utility model provides a LED luminous drive circuit, when input voltage has the change, first triode and second triode restrict mutually, make the electric current can not keep invariable along with the voltage change, through this kind of constant current drive circuit, improved the stability of LED lamp current and irradiance, avoided the risk that causes LED lamp life damage when input voltage fluctuates; in addition, each LED lamp corresponds a set of drive circuit, even one of them appears damaging, other groups still can normally work, possess higher expansibility and reliability, and this kind of LED sends out light drive circuit and is particularly useful for among the degerming of air conditioner and the air purification function.

Drawings

Fig. 1 is a circuit schematic diagram of an embodiment of an LED lighting driving circuit provided by the present invention;

fig. 2 is a circuit schematic diagram of another embodiment of an LED lighting driving circuit provided by the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The embodiment of the utility model provides a LED luminous drive circuit, including first power input end, second power input end, protection circuit and N LED branch road, N is greater than or equal to 1;

the second power input end is connected with the input end of the protection circuit, the output end of the protection circuit is connected with the input end of the LED branch, and the output end of the LED branch is connected with the first power input end.

Referring to fig. 1, the present invention provides a circuit diagram of an embodiment of an LED lighting driving circuit. In the present embodiment, 1 LED branch is used for illustration, and the structure of each circuit of the LED light-emitting driving circuit will be specifically described below;

as shown in fig. 1, the protection circuit includes a diode D1, the anode of the diode D1 is the input terminal of the protection circuit, and the cathode of the diode D1 is the output terminal of the protection circuit, so that when the anode and the cathode of the interface are connected in reverse, the device will not be damaged.

The LED branch circuit comprises a first filter capacitor C1, a first light emitting diode LED1, a first triode V1, a second triode V2, a first resistor R1, a second resistor R2, a third resistor R3 and a first voltage end VCC;

a first end of the first filter capacitor C1 is an input end of the LED branch, a second end of the first filter capacitor C1 is an output end of the LED branch, and the first voltage terminal VCC is connected to a first end of the first filter capacitor C1;

the anode of the first light emitting diode LED1 is connected to the first end of the first filter capacitor C1, the cathode of the first light emitting diode LED1 is connected to the collector of the first triode V1, the emitter of the first triode V1 is connected to the first end of the second resistor R2, the base of the first triode V1 is connected to the collector of the second triode V2, and the second end of the second resistor R2 is connected to the second end of the first filter capacitor C1;

the first end of the first resistor R1 is connected with the first end of the first filter capacitor C1, the second end of the first resistor R1 is connected with the collector of the second triode V2, the base of the second triode V2 is connected with the emitter of the first triode V1, the emitter of the second triode V2 is connected with the first end of the third resistor R3, and the second end of the third resistor R3 is grounded.

In the embodiment of the present invention, first filter capacitor C1 can make first voltage end VCC reduce interference and fluctuation because of the external world brings to a certain extent, when first voltage end VCC voltage increases, the base voltage of corresponding first triode V1 increases, the current of first light emitting diode LED1 increases, the collector current and the emitter current of first triode V1 become, the partial pressure of second resistor R2 will become, so the base voltage of second triode V2 increases, the base current of second triode V2 also increases, thereby the collector current of second triode V2 also increases, the base current that leads to first triode V1 becomes little, so the collector current of first triode V1 drops, finally feed back first light emitting diode LED1 and make its current drop, so it is a constant current driving circuit. On the contrary, when the voltage of the first voltage terminal VCC decreases, there is a corresponding negative feedback effect, so as to achieve the purpose of making the current of the first light emitting diode LED1 constant.

Specifically, the LED branch circuit forms a circuit for locking a current value flowing through the first light emitting diode LED1 through the first triode V1, the second triode V2, the first resistor R1, the second resistor R2 and the third resistor R3, when a VCC voltage at the first voltage end has a certain change, the first triode V1 and the second triode V2 are mutually limited, the first triode V1 works in an amplification region, and the base and emitter voltages of the first triode V1 are kept stable, the number of carriers of the first triode V1 is constant, and the current cannot be changed with the voltage and is kept constant.

It should be noted that the first resistor R1, the second resistor R2, and the third resistor R3 may select parameters according to the actual required current of the first light emitting diode LED1 and the amplification characteristics of the first triode V1 and the second triode V2; the third resistor R3 may be selected to be a 0 ohm resistor for short circuit processing.

Preferably, the first transistor V1 and the second transistor V2 are both NPN transistors, and the first light emitting diode LED1 is an ultraviolet LED.

In the specific implementation, the LED branch can be extended into two paths according to the actual requirement, and the operation principle of the extended LED branch and the functions of each device in the circuit are the same as those of the LED branch in fig. 1, and will not be described in detail here. And under the condition of not strict requirement on input voltage, the method can be expanded into multiple paths, namely N is more than or equal to 2.

Referring to fig. 2, the present invention provides a circuit diagram of another embodiment of an LED lighting driving circuit. The LED light-emitting drive circuit comprises a plurality of LED branches, namely N is more than or equal to 2. In this embodiment, the structure of each LED branch adopts the structure of the LED branch shown in fig. 1, that is, each LED lamp corresponds to one group of LED branches, and even if one LED lamp is damaged or broken, other groups of LED branches can still work normally, and have higher expansibility and reliability.

The embodiment of the utility model provides an air conditioner has still provided an air conditioner, has adopted foretell LED drive circuit that gives out light on this air conditioner, is applicable to in the degerming and the air purification function of air conditioner.

The air conditioner can be, but is not limited to, a variable frequency air conditioner, a variable frequency mobile air conditioner. Furthermore, the utility model discloses a LED light-emitting drive circuit still is applicable to products such as air purifier, new fan.

To sum up, the embodiment of the present invention provides an LED lighting driving circuit, when the input voltage changes, the first triode and the second triode are mutually limited, so that the current will not change with the voltage and keep constant, and by using the constant current driving circuit, the stability of the LED lamp current and irradiance is improved, and the risk of the LED lamp life damage caused by the fluctuation of the input voltage is avoided; in addition, each LED lamp corresponds a set of drive circuit, even one of them appears damaging, other groups still can normally work, possess higher expansibility and reliability, and this kind of LED sends out light drive circuit and is particularly useful for among the degerming of air conditioner and the air purification function.

The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations are also considered as the protection scope of the present invention.

Claims

1. An LED light-emitting drive circuit is characterized by comprising a first power supply input end, a second power supply input end, a protection circuit and N LED branches, wherein N is more than or equal to 1;

2. The LED luminescence drive circuit of claim 1, wherein the protection circuit comprises a diode;

3. The LED luminescence drive circuit of claim 2, wherein the first transistor and the second transistor are NPN transistors.

4. The LED luminescence drive circuit of claim 3, wherein said first light emitting diode is an ultraviolet LED.

5. An air conditioner characterized by comprising the LED light emission driving circuit according to any one of claims 1 to 4.