CN202285447U

CN202285447U - Power supply drive circuit for LED lamp tube

Info

Publication number: CN202285447U
Application number: CN2011204160552U
Authority: CN
Inventors: 黄景温
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-10-27
Filing date: 2011-10-27
Publication date: 2012-06-27
Anticipated expiration: 2021-10-27

Abstract

The utility model discloses a power supply drive circuit for an LED (Light Emitting Diode) lamp tube, which comprises input terminals, a rectification circuit, a PFC ( Power Factor Correction) circuit, a driving and controlling circuit and an output circuit, wherein, the driving and controlling circuit is an LED constant-current drive circuit; the rectification circuit comprises a first rectifier bridge and a second rectifier bridge; an anode output end of the first rectifier bridge is connected with the anode output end of the second rectifier bridge; a cathode output end of the first rectifier bridge is connected with the cathode output end of the second rectifier bridge; and input ends of the first rectifier bridge and the second rectifier bridge are respectively connected with the input terminals. The power supply drive circuit adopts the constant-current drive circuit, so that the disadvantages of a constant-voltage drive circuit can be solved; the rectification circuit adopts the two rectifier bridges that are connected in parallel, so that the lamp tube can be supplied in a one-sided manner, and the cost is saved; in addition, any two of the four input terminals that are connected with the input end of the rectification circuit correspondingly can be in plug-in connection with a power supply circuit, and the plug-in connection manner is very flexible, simple and convenient.

Description

A kind of LED tube power drive circuit

Technical field

The utility model relates to a kind of LED fluorescent tube, especially relates to the power driving circuit of LED fluorescent tube.

Background technology

Semiconductor lighting (LED) technical development at present is quite swift and violent, is progressively replacing the status of fluorescent lighting, and why development trend like this is arranged; Be because it has the technical advantage of following several respects: 1, fail safe is good, and the semiconductor bulk light-emitting diode is the solid state device that organic resin and semi-conducting material, metal material encapsulate, and is firm in structure; Can not produce loosening, broken situation during normal the use; And this luminous element is a cold light source, and drive circuit does not have high voltage yet, therefore; Can not cause related accident, himself fail safe and safety of environment property is all fine to external world because of high temperature and the inner high voltage in broken back; 2, long service life, several ten thousand hours useful life of light-emitting diode, therefore, the semiconductor lighting technology than life-span of any conventional light source in the past grow many; 3, luminous efficiency is high; In the power bracket below 3W, the luminous efficiency of various light sources all reduces significantly, and has only the luminous efficiency of light-emitting diode to remain on than higher level; Therefore, the light efficiency of micropower when illumination semiconductor etc. will be far above other light sources; 4, rich color, light-emitting diode has shades of colour, can satisfy the various special lighting requirements beyond the white light; 5, driving and convenient regulation and control, light-emitting diode is a current-type driver spare, changes the current value that flows through light-emitting diode and just can change brightness, therefore, drives and convenient regulation and control; 6, volume is little, in light weight, and light-emitting diode is miniature point-source of light, therefore, can make very little volume, and is in light weight certainly; 7, aster does not have heavy metal pollution, is beneficial to environmental protection.Above just these advantages have determined light emitting semiconductor device will develop into the novel illumination light source, change the existing Lighting Industry structure and the market structure, change people's living environment.But the novel semi-conductor light source needs special power driving circuit to guarantee its operate as normal.Therefore; The design of power driving circuit and selection just seem extremely important; Present great power LED power driving circuit on the market generally all adopts the constant voltage type of drive, and each fluorescent tube adopts the form of two-side feeding; The shortcoming that constant voltage drives is the variation along with circuital current, and each LED luminosity is inconsistent; And often the damage of a certain LED is arranged in the lamp group and make the electrorheological of integrated circuit big, and then cause the damage or the lost of life of whole LED lamp group; In addition, fluorescent tube adopts two-side feeding, just need a power driving circuit respectively is set at the two ends of fluorescent tube, and not only waste, and installing than trouble, and also the grafting of the input terminal of power driving circuit and power supply circuits is unique, the grafting underaction.

Summary of the invention

To the problems referred to above, the utility model provides a kind of constant-current supply drive circuit of realizing the LED fluorescent tube that single side feeding, input terminal and power supply circuits can be pegged graft flexibly.

The utility model is that the technical scheme that its technical problem of solution is adopted is:

A kind of LED tube power drive circuit; Comprise input terminal, rectification circuit, PFC circuit of power factor correction, Drive and Control Circuit and output circuit; Wherein input terminal is connected with the input of said rectification circuit; The output of rectification circuit is connected with the input of Drive and Control Circuit through the PFC circuit of power factor correction, and the output of Drive and Control Circuit is connected with LED through output circuit, and it is characterized in that: said Drive and Control Circuit is the LED constant-current drive circuit; Said rectification circuit comprises first rectifier bridge and second rectifier bridge wherein; The cathode output end of first rectifier bridge links to each other with the cathode output end of second rectifier bridge, and the cathode output end of first rectifier bridge links to each other with the cathode output end of second rectifier bridge, and the input of first, second rectifier bridge is connected respectively to input terminal.

Further, between the input of the output of said rectification circuit and PFC circuit of power factor correction piezo-resistance RV1 is set.

Wherein, Said Drive and Control Circuit comprises constant-current driving control chip U1, FET Q1, and by resistance R 2, R3, R4, R5, R6, diode D7; Peripheral circuit with capacitor C 3, C4 composition; The source electrode that first pin of constant-current driving control chip U1 connects FET Q1 carries out constant current control to output circuit, and the grid of FET Q1 is connected to first pin of constant-current driving control chip U1, and the 3rd pin of constant-current driving control chip U1 links to each other with the 4th pin and afterwards is connected to the output of PFC circuit of power factor correction through the series circuit of being made up of resistance R 2, R4, R5; The 4th pin of constant-current driving control chip U1 is also through diode D7 ground connection; The drain electrode of FET Q1 links to each other with output circuit, and the 5th pin of constant-current driving control chip U1 is through capacitor C 4 ground connection, and resistance R 3 is connected with the 6th pin of constant-current driving control chip U1 with resistance R 6 parallel connection backs one end; The direct ground connection of the other end, the direct ground connection of second pin of constant-current driving control chip U1.

As the further improvement of such scheme, the source electrode of said FET Q1 directly is connected with a diode Q1 with drain electrode, and the anode of this diode Q1 links to each other with the drain electrode of FET Q1, and the negative electrode of diode Q1 links to each other with the source electrode of FET Q1.

The beneficial effect of the utility model is: the power driving circuit of the LED fluorescent tube of the utility model adopts the LED constant-current drive circuit; Solved constant voltage and driven variation along with circuital current; Damage because of LED in the inconsistent and use of each LED luminosity makes the electrorheological of integrated circuit big, and then causes the damage of whole LED lamp group or the deficiency of the lost of life; And rectification circuit adopts two groups of rectifier bridge parallel connections can make fluorescent tube realize single side feeding, practices thrift cost, can peg graft with power supply circuits for any two of 4 input terminals of corresponding connection with rectification circuit input end, and inserting mode is very flexible, easy.

Description of drawings

Below in conjunction with accompanying drawing and specific embodiment the present invention is described further:

Fig. 1 is the circuit block diagram of the utility model embodiment;

Fig. 2 is the circuit theory diagrams of the utility model embodiment.

Embodiment

With reference to Fig. 1, Fig. 2; A kind of LED tube power drive circuit of the utility model; Comprise input terminal 1, rectification circuit 2, PFC circuit of power factor correction 3, Drive and Control Circuit 4 and output circuit 5; Wherein input terminal 1 is connected with the input of said rectification circuit 2; The output of rectification circuit 2 is connected with the input of Drive and Control Circuit 4 through PFC circuit of power factor correction 3, and the output of Drive and Control Circuit 4 is connected with LED through output circuit 5, and said Drive and Control Circuit 4 is the LED constant-current drive circuit; Said rectification circuit 2 comprises first rectifier bridge 21 and second rectifier bridge 22 wherein; The cathode output end of first rectifier bridge 21 links to each other with the cathode output end of second rectifier bridge 22, and the cathode output end of first rectifier bridge 21 links to each other with the cathode output end of second rectifier bridge 22, and the input of first, second rectifier bridge 21,22 is connected respectively to input terminal 1.

Further, between the input of the output of said rectification circuit 2 and PFC circuit of power factor correction 3 piezo-resistance RV1 is set, the abnormal overvoltage that occurs in this piezo-resistance RV1 circuit capable of inhibiting, protective circuit is avoided superpotential infringement.

1, wherein; Said Drive and Control Circuit 4 comprises constant-current driving control chip U1, FET Q1, and by resistance R 2, R3, R4, R5, R6, diode D7; Peripheral circuit with capacitor C 3, C4 composition; The source electrode that first pin of constant-current driving control chip U1 connects FET Q1 carries out constant current control to output circuit 5, and the grid of FET Q1 is connected to first pin of constant-current driving control chip U1, and the 3rd pin of constant-current driving control chip U1 links to each other with the 4th pin and afterwards is connected to the output of PFC circuit of power factor correction 3 through the series circuit of being made up of resistance R 2, R4, R5; The 4th pin of constant-current driving control chip U1 is also through diode D7 ground connection; The drain electrode of FET Q1 links to each other with output circuit 5, and the 5th pin of constant-current driving control chip U1 is through capacitor C 4 ground connection, and resistance R 3 is connected with the 6th pin of constant-current driving control chip U1 with resistance R 6 parallel connection backs one end; The direct ground connection of the other end, the direct ground connection of second pin of constant-current driving control chip U1.Wherein, constant-current driving control chip U1 can adopt the QX9910 chip, and this chip is a high efficiency, reliable and stable high-brightness LED lamp constant-current driving control chip, and the invention also can be adopted the constant-current driving control chip of other types certainly.

As the further improvement of such scheme, the source electrode of above-mentioned FET Q1 directly is connected with a diode Q1 with drain electrode, and the anode of this diode Q1 links to each other with the drain electrode of FET Q1, and the negative electrode of diode Q1 links to each other with the source electrode of FET Q1.

Above-mentioned PFC circuit of power factor correction 3 is made up of resistance R 1, capacitor C 1, C2 and diode D3, D4, D5; Wherein the negative electrode of diode D3 links to each other with the cathode output end of rectification circuit 2; The anode of diode D3 links to each other with the negative electrode of diode D4 through resistance R 1; The anode of diode D4 links to each other with the negative electrode of diode D5, and the anode of diode D5 links to each other with the cathode output end of rectification circuit 2; One end of capacitor C 1 links to each other with the negative electrode of diode D3, and the other end of capacitor C 1 links to each other with the anode of diode D4; One end of capacitor C 2 links to each other with the anode of diode D3, and the other end of capacitor C 2 links to each other with the anode of diode D5.

More than be that preferable enforcement to the utility model specifies; But the invention is not limited to said embodiment; Those of ordinary skill in the art also can make all equivalent variations or replacement under the prerequisite of the utility model spirit, distortion that these are equal to or replacement all are included in the application's claim institute restricted portion.

Claims

1. LED tube power drive circuit; Comprise input terminal (1), rectification circuit (2), PFC circuit of power factor correction (3), Drive and Control Circuit (4) and output circuit (5); Wherein input terminal (1) is connected with the input of said rectification circuit (2); The output of rectification circuit (2) is connected with the input of Drive and Control Circuit (4) through PFC circuit of power factor correction (3); The output of Drive and Control Circuit (4) is connected with LED through output circuit (5); It is characterized in that: said Drive and Control Circuit (4) is the LED constant-current drive circuit, and said rectification circuit (2) comprises first rectifier bridge (21) and second rectifier bridge (22) wherein, and the cathode output end of first rectifier bridge (21) links to each other with the cathode output end of second rectifier bridge (22); The cathode output end of first rectifier bridge (21) links to each other with the cathode output end of second rectifier bridge (22), and the input of first, second rectifier bridge (21,22) is connected respectively to input terminal (1).

2. a kind of LED tube power drive circuit according to claim 1 is characterized in that: between the input of the output of said rectification circuit (2) and PFC circuit of power factor correction (3) piezo-resistance RV1 is set.

3. a kind of LED tube power drive circuit according to claim 1 and 2; It is characterized in that: said Drive and Control Circuit (4) comprises constant-current driving control chip U1, FET Q1; And by resistance R 2, R3, R4, R5, R6; The source electrode that the peripheral circuit that diode D7 and capacitor C 3, C4 form, first pin of constant-current driving control chip U1 connect FET Q1 carries out constant current control to output circuit (5); The grid of FET Q1 is connected to first pin of constant-current driving control chip U1; The 3rd pin of constant-current driving control chip U1 links to each other with the 4th pin and afterwards is connected to the output of PFC circuit of power factor correction (3) through the series circuit of being made up of resistance R 2, R4, R5, and also through diode D7 ground connection, the drain electrode of FET Q1 links to each other with output circuit (5) the 4th pin of constant-current driving control chip U1; The 5th pin of constant-current driving control chip U1 is through capacitor C 4 ground connection; Resistance R 3 is connected the direct ground connection of the other end, the direct ground connection of second pin of constant-current driving control chip U1 with resistance R 6 parallel connection backs one end with the 6th pin of constant-current driving control chip U1.

4. a kind of LED tube power drive circuit according to claim 3; It is characterized in that: the source electrode of said FET Q1 directly is connected with a diode Q1 with drain electrode; The anode of this diode Q1 links to each other with the drain electrode of FET Q1, and the negative electrode of diode Q1 links to each other with the source electrode of FET Q1.