CN202535617U

CN202535617U - LED (light-emitting diode) lighting device and LED drive circuit thereof

Info

Publication number: CN202535617U
Application number: CN201220361764XU
Authority: CN
Inventors: 邓子长
Original assignee: SHENZHEN CHANGFANG SEMICONDUCTOR LIGHT CO Ltd
Current assignee: Shenzhen rectangular group Limited by Share Ltd
Priority date: 2012-07-25
Filing date: 2012-07-25
Publication date: 2012-11-14
Anticipated expiration: 2022-07-25

Abstract

The utility model is applicable to the field of LED (light-emitting diode) drive circuit design, and provides an LED (light-emitting diode) lighting device and an LED drive circuit thereof. The drive circuit comprises a rectification bridge circuit and a constant current drive circuit, and the drive circuit also comprises a resistor R1 and a resistor R2; one end of the resistor R1 is connected with a power supply positive output end of the rectification bridge circuit, and the other end of the resistor R1 is connected with the constant current drive circuit through the resistor R2; and the other end of the resistor R1 is simultaneously connected with a overvoltage detection pin of the constant current drive circuit. According to the utility model, the resistor R1 and the resistor R2 are used to detect whether overvoltage appears, if the overvoltage appears, the conducted current of LED load is controlled to reduce the overall power of the LED lighting device, and thus the breakage risk of the LED load is reduced and the service life of the LED load is prolonged.

Description

A kind of LED lighting device and led drive circuit thereof

Technical field

The utility model belongs to the led drive circuit design field, relates in particular to a kind of LED lighting device and led drive circuit thereof.

Background technology

LED is little with its volume, characteristics such as power consumption is low, long service life, is widely used in lighting field.At present, the led drive circuit in the LED lighting device generally adopts constant-current driving or constant voltage driving to come the driving LED load luminous.For the led drive circuit that adopts constant current drive mode, it has a constant-current drive circuit for the LED load configuration, and this constant-current drive circuit is used the luminous intensity that constant-current driven chip is controlled the LED load.

But between LED load light emission period; The LED load is very easily owing to the overvoltage phenomenon that reasons such as noise jamming occur is damaged; Thereby shortened the useful life of LED load, and the led drive circuit in the existing LED lighting device does not have the over-voltage protecting function to the LED load.

The utility model content

The purpose of the utility model is to provide a kind of LED LED illumination device drive circuit, is intended to solve in the existing LED lighting device, and the LED load is very easily owing to the overvoltage phenomenon that reasons such as noise jamming occur is damaged the problem that useful life is low.

The utility model is to realize like this; A kind of LED LED illumination device drive circuit; The constant-current drive circuit of the negative electrode of LED load in comprising rectifier circuit and being connected said LED lighting device; The power supply positive output end of said rectifier circuit connects the anode of said LED load, and said led drive circuit also comprises resistance R 1 and resistance R 2;

One end of said resistance R 1 connects the power supply positive output end of said rectifier circuit; The other end of said resistance R 1 connects said constant-current drive circuit through said resistance R 2, and the overvoltage that the other end of said resistance R 1 connects said constant-current drive circuit simultaneously detects pin.

Said led drive circuit can also comprise:

Place the front end of said led drive circuit and connect said rectifier circuit, the protective circuit that provides thunder-strike current to release path.

Further, said protective circuit can comprise a piezo-resistance VDR1, and said piezo-resistance VDR1 is connected in parallel between two input pins of said rectifier circuit.

Further, said protective circuit can also comprise a fuse F, and said fuse F is connected between the input pin and external power source of said rectifier circuit.

Said constant-current drive circuit can comprise constant-current driven chip U1, and the overvoltage of said constant-current driven chip U1 detects the other end that pin connects said resistance R 1, and the constant current output pin of said constant-current driven chip connects the negative electrode of said LED load.

Further, said constant-current drive circuit can also comprise resistance R 3, resistance R 4 and capacitor C 1;

One end of said resistance R 3 connects the power supply positive output end of said rectifier circuit; The other end of said resistance R 3 is through said resistance R 4 ground connection; Said capacitor C 1 is connected in parallel on the two ends of said resistance R 4, and the other end of said resistance R 3 connects the oscillator signal input pin of said constant-current driven chip.

In addition, said rectifier circuit, constant-current drive circuit, resistance R 1 and resistance R 2 can be welded on the glass wiring board.

Another purpose of the utility model is; A kind of LED lighting device also is provided; Comprise LED load and the led drive circuit that connects said LED load; The constant-current drive circuit of the negative electrode of LED load during said led drive circuit comprises rectifier circuit and is connected said LED lighting device, the power supply positive output end of said rectifier circuit connects the anode of said LED load, and said led drive circuit also comprises resistance R 1 and resistance R 2;

Wherein, the overvoltage of said constant-current driven chip U1 detects the other end that pin connects said resistance R 1, and the constant current output pin of said constant-current driven chip connects the negative electrode of said LED load;

At this moment; Said constant-current drive circuit also comprises resistance R 3, resistance R 4 and capacitor C 1; One end of said resistance R 3 connects the power supply positive output end of said rectifier circuit; The other end of said resistance R 3 is through said resistance R 4 ground connection, and said capacitor C 1 is connected in parallel on the two ends of said resistance R 4, and the other end of said resistance R 3 connects the oscillator signal input pin of said constant-current driven chip.

The LED LED illumination device drive circuit of the utility model has increased the over-voltage detection circuit that is made up of resistance R 1 and resistance R 2; This constant-current drive circuit utilizes the over-voltage detection circuit detection overvoltage whether to occur; Then control the overall power of the conducting electric current of LED load if overvoltage occurs with reduction LED lighting device; Thereby reduced the damage risk of LED load, improved the useful life of LED load.In addition, in this led drive circuit, the peripheral component of constant-current driven chip is few; Processing technology is simple, and conversion efficiency is greater than 90%, and power factor (PF) is greater than 0.85; Simultaneously, because its inside is integrated with the circuit with no electrolytic capacitor filter function, thereby need not to use electrochemical capacitor in the peripheral circuit; Make use long-life (greater than 50000 hours) of circuit, and EMI is very low, easily through the EMC relevant authentication.

Description of drawings

Fig. 1 is the circuit structure diagram of the LED LED illumination device drive circuit that provides of the utility model;

Fig. 2 is the circuit diagram of protective circuit among Fig. 1;

Fig. 3 is the circuit diagram of constant-current drive circuit among Fig. 1.

Embodiment

For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.

Problem to the prior art existence; In the utility model; Constant-current drive circuit in the LED lighting device utilizes an over-voltage detection circuit testing circuit overvoltage whether to occur, then controls the overall power of the conducting electric current of LED load with reduction LED lighting device if overvoltage occurs.

Fig. 1 is the circuit structure of the LED LED illumination device drive circuit that provides of the utility model, for the ease of explanation, only shows the part relevant with the utility model.

This LED LED illumination device drive circuit comprises: convert the 220V alternating current to galvanic rectifier circuit 12, the power supply positive output end of rectifier circuit 12 connects the anode of LED load in the LED lighting device; The constant-current drive circuit 13 that connects the negative electrode of LED load.Different with prior art; The LED LED illumination device drive circuit that the utility model provides also comprises an over-voltage detection circuit 14; This over-voltage detection circuit 14 comprises resistance R 1 and resistance R 2; One end of resistance R 1 connects the power supply positive output end of rectifier circuit 12, and the other end of resistance R 1 connects constant-current drive circuit 13 through resistance R 2, and the overvoltage that the other end of resistance R 1 connects constant-current drive circuit 13 simultaneously detects pin.

Because the LED LED illumination device drive circuit of the utility model has increased the over-voltage detection circuit that is made up of resistance R 1 and resistance R 2; Whether constant-current drive circuit this over-voltage detection circuit testing circuit capable of using overvoltage occurs; Then control the overall power of the conducting electric current of LED load if overvoltage occurs with reduction LED lighting device; Thereby reduced the damage risk of LED load, improved the useful life of LED load.

In order to protect the safety of LED load and this LED LED illumination device drive circuit; The LED LED illumination device drive circuit that the utility model provides also comprises: place the front end of LED LED illumination device drive circuit and connect rectifier circuit; The protective circuit 11 that provides thunder-strike current to release path; Thereby make thunder-strike current in time to release, improve the circuit whole reliability through protective circuit 11.

Fig. 2 shows the protective circuit 11 among Fig. 1.

Particularly, protective circuit 11 comprises a piezo-resistance VDR1, and piezo-resistance VDR1 is connected in parallel between two input pins of rectifier circuit 12.

Protective circuit 11 can also comprise a fuse F, and fuse F is connected between the input pin and external power source of rectifier circuit 12, thus the safe operation of protection LED load and subsequent conditioning circuit.

Fig. 3 shows the constant-current drive circuit 13 among Fig. 1.

Particularly, constant-current drive circuit 13 can comprise constant-current driven chip U1, and the overvoltage of constant-current driven chip U1 detects the other end that pin VDD connects resistance R 1, and the constant current output pin CD of constant-current driven chip U1 connects the negative electrode of LED load.This electric current is in when work, and constant-current driven chip U1 detects the branch pressure voltage of the other end of resistance R 1, and when detected branch pressure voltage during greater than threshold value, and the conducting electric current through constant current output pin CD control LED load is with the overall power of reduction LED lighting device.

Can find out that in the utility model, the peripheral component of constant-current driven chip U1 is few; Conversion efficiency is greater than 90%, and power factor (PF) is greater than 0.85, simultaneously; Because its inside is integrated with the circuit with no electrolytic capacitor filter function, thereby need not to use electrochemical capacitor in the peripheral circuit, make use long-life (greater than 50000 hours) of circuit; And EMI is very low, easily through the EMC relevant authentication.

At this moment, utilize the internal temperature measuring ability of constant-current driven chip U1, can realize the overheated measuring ability to ambient temperature, particularly, constant-current drive circuit 13 can also comprise resistance R 3, resistance R 4 and capacitor C 1.One end of resistance R 3 connects the power supply positive output end of rectifier circuit 12, and the other end of resistance R 3 is through resistance R 4 ground connection, and capacitor C 1 is connected in parallel on the two ends of resistance R 4, and the other end of resistance R 3 connects the oscillator signal input pin VCH of constant-current driven chip U1.When work; Resistance R 3, resistance R 4 and capacitor C 1 are as the oscillating circuit of constant-current driven chip U1 and to constant-current driven chip U1 input oscillator signal; Constant-current driven chip U1 utilizes the temperature inside testing circuit to detect the ambient temperature of constant-current driven chip U1; If detected ambient temperature surpasses threshold value, then control the overall power of the conducting electric current of LED load with reduction LED lighting device through constant current output pin CD.

In the utility model, aforesaid protective circuit 11, rectification circuit 12, over-voltage detection circuit 14, the one or more of constant-current drive circuit 13 can be welded on the glass wiring board.

The utility model also provides a kind of LED lighting device, comprises LED load and the aforesaid LED LED illumination device drive circuit that connects the LED load.

The LED LED illumination device drive circuit of the utility model has increased the over-voltage detection circuit that is made up of resistance R 1 and resistance R 2; This constant-current drive circuit utilizes the over-voltage detection circuit detection overvoltage whether to occur; Then control the overall power of the conducting electric current of LED load if overvoltage occurs with reduction LED lighting device; Thereby reduced the damage risk of LED load, improved the useful life of LED load.In addition, the peripheral component of the integral body of constant-current driven chip is few, and processing technology is simple; Conversion efficiency is greater than 90%, and power factor (PF) is greater than 0.85, simultaneously; Because its inside is integrated with the circuit with no electrolytic capacitor filter function, thereby need not to use electrochemical capacitor in the peripheral circuit, make use long-life (greater than 50000 hours) of circuit; And EMI is very low, easily through the EMC relevant authentication.

The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection range of the utility model.

Claims

1. LED LED illumination device drive circuit; The constant-current drive circuit of the negative electrode of LED load in comprising rectifier circuit and being connected said LED lighting device; The power supply positive output end of said rectifier circuit connects the anode of said LED load; It is characterized in that said led drive circuit also comprises resistance R 1 and resistance R 2;

2. LED LED illumination device drive circuit as claimed in claim 1 is characterized in that said led drive circuit also comprises:

3. LED LED illumination device drive circuit as claimed in claim 2 is characterized in that said protective circuit comprises a piezo-resistance VDR1, and said piezo-resistance VDR1 is connected in parallel between two input pins of said rectifier circuit.

4. LED LED illumination device drive circuit as claimed in claim 3 is characterized in that said protective circuit also comprises a fuse F, and said fuse F is connected between the input pin and external power source of said rectifier circuit.

5. LED LED illumination device drive circuit as claimed in claim 1; It is characterized in that; Said constant-current drive circuit comprises constant-current driven chip U1; The overvoltage of said constant-current driven chip U1 detects the other end that pin connects said resistance R 1, and the constant current output pin of said constant-current driven chip connects the negative electrode of said LED load.

6. LED LED illumination device drive circuit as claimed in claim 5 is characterized in that said constant-current drive circuit also comprises resistance R 3, resistance R 4 and capacitor C 1;

7. LED LED illumination device drive circuit as claimed in claim 1 is characterized in that said rectifier circuit, constant-current drive circuit, resistance R 1 and resistance R 2 are welded on the glass wiring board.

8. LED lighting device; Comprise LED load and the led drive circuit that connects said LED load; The constant-current drive circuit of the negative electrode of LED load during said led drive circuit comprises rectifier circuit and is connected said LED lighting device; The power supply positive output end of said rectifier circuit connects the anode of said LED load, it is characterized in that, said led drive circuit also comprises resistance R 1 and resistance R 2;

9. LED lighting device as claimed in claim 8; It is characterized in that; Said constant-current drive circuit comprises constant-current driven chip U1; The overvoltage of said constant-current driven chip U1 detects the other end that pin connects said resistance R 1, and the constant current output pin of said constant-current driven chip connects the negative electrode of said LED load;

Said constant-current drive circuit also comprises resistance R 3, resistance R 4 and capacitor C 1; One end of said resistance R 3 connects the power supply positive output end of said rectifier circuit; The other end of said resistance R 3 is through said resistance R 4 ground connection; Said capacitor C 1 is connected in parallel on the two ends of said resistance R 4, and the other end of said resistance R 3 connects the oscillator signal input pin of said constant-current driven chip.