CN203368845U

CN203368845U - LED drive circuit based on field effect transistor

Info

Publication number: CN203368845U
Application number: CN 201320400241
Authority: CN
Inventors: 黎国伟
Original assignee: Guangzhou Homsemi Semiconductor Co ltd
Current assignee: Guangzhou Homsemi Semiconductor Co ltd
Priority date: 2013-07-05
Filing date: 2013-07-05
Publication date: 2013-12-25
Anticipated expiration: 2023-07-05

Abstract

The utility model discloses an LED drive circuit based on a field effect transistor. The LED drive circuit includes a rectifying circuit, a fuse, a field effect transistor, a voltage division circuit, an inductor, a first resistor, a diode and a first capacitor. An output end of the rectifying circuit is connected with one end of the fuse and the other end of the fuse is connected with a grid electrode of the field effect transistor and a first connecting end of the voltage division circuit. A drain electrode of the field effect transistor is connected with a second connecting end of the voltage division circuit. A third connecting end of the voltage division circuit is in ground connection. A source electrode of the field effect transistor is connected with one end of the inductor and a negative pole of the diode and the other end of the inductor is connected with the first connecting end of the voltage division circuit and one end of the first resistor. The other end of the first resistor is in ground connection. A positive pole of the diode is in ground connection through the first capacitor. The two ends of the first capacitor are in parallel connection with an LED. The LED drive circuit based on the field effect transistor is simple in realization method, low in manufacturing cost and widely applicable to the LED lighting field.

Description

A kind of LED drive circuit based on field effect transistor

Technical field

The utility model relates to a kind of drive circuit, particularly a kind of drive circuit for the driving LED lamp based on field effect transistor.

Background technology

The LED lamp not only has the illumination life-span of overlength, has energy-efficient advantage simultaneously.Generally, the even lasting illumination of up to a hundred hours that the LED lamp can provide tens hours, and power consumption is few, relatively it is with the obvious advantage for this and other light fixture, therefore the LED lamp has been subject to numerous consumers' favor, wide market prospects are arranged, adopt more and more in the market the LED lamp to replace traditional lighting.Be used at present replacing the LED lamp of conventional lamp, drive circuit need to be set and carry out commutation supply voltage, but the drive circuit of LED lamp is too complicated at present, causes having increased production cost, thereby has limited application and the popularization of LED lamp.

The utility model content

In order to solve above-mentioned technical problem, the purpose of this utility model is to provide a kind of circuit simply and the LED drive circuit based on field effect transistor cheaply.

The utility model solves the technical scheme that its technical problem adopts:

A kind of LED drive circuit based on field effect transistor, for the driving LED lamp, comprise rectification circuit, fuse, field effect transistor, bleeder circuit, inductance, the first resistance, diode and the first electric capacity;

The output of described rectification circuit is connected with an end of fuse, the other end of described fuse is connected with the grid of field effect transistor and the first link of bleeder circuit respectively, the drain electrode of described field effect transistor is connected with the second link of bleeder circuit, the 3rd link ground connection of described bleeder circuit, the source electrode of described field effect transistor is connected with an end of inductance and the negative pole of diode respectively, the other end of described inductance is connected with the first link of bleeder circuit and an end of the first resistance respectively, the other end ground connection of described the first resistance, the positive pole of described diode is by the first capacity earth, described the first electric capacity two ends are in parallel with the LED lamp.

Further, also comprise the second electric capacity, an end of described the second electric capacity is connected with the first link of bleeder circuit, the other end ground connection of described the second electric capacity.

Further, described bleeder circuit comprises the second resistance and adjustable resistance, the first link that one end of described the second resistance is bleeder circuit, the other end of described the second resistance and the second link that an end of adjustable resistance is connected and connected node is bleeder circuit, the 3rd link that the other end of described adjustable resistance is bleeder circuit.

The beneficial effects of the utility model are: a kind of LED drive circuit based on field effect transistor of the present utility model, by field effect transistor, the power supply that outputs to LED lamp two ends is controlled, realize the control of output voltage and output current, the circuit implementation is simple, reduce production cost, thereby can be used for the driving LED lamp, promoted applying of LED lamp.

The accompanying drawing explanation

Below in conjunction with drawings and Examples, the utility model is described in further detail.

Fig. 1 is the structure chart of a kind of LED drive circuit based on field effect transistor of the present utility model;

Fig. 2 is the structure chart of a specific embodiment of a kind of LED drive circuit based on field effect transistor of the present utility model.

Embodiment

With reference to Fig. 1, the utility model provides a kind of LED drive circuit based on field effect transistor, for driving LED lamp D2, comprises rectification circuit 1, fuse F, field effect transistor 2, bleeder circuit 3, inductance L, the first resistance R 1, diode D1 and the first capacitor C 1;

The output of rectification circuit 1 is connected with the end of fuse F, the other end of fuse F is connected with the grid of field effect transistor 2 and the first link of bleeder circuit 3 respectively, the drain electrode of field effect transistor 2 is connected with the second link of bleeder circuit 3, the 3rd link ground connection of bleeder circuit 3, the source electrode of field effect transistor 2 is connected with an end of inductance L and the negative pole of diode D1 respectively, the other end of inductance L is connected with the first link of bleeder circuit 3 and an end of the first resistance R 1 respectively, the other end ground connection of the first resistance R 1, the positive pole of diode D1 is by the first capacitor C 1 ground connection, the first capacitor C 1 two ends are in parallel with LED lamp D2.

Further, also comprise that an end of the second capacitor C 2, the second capacitor C 2 is connected with the first link of bleeder circuit 3, the other end ground connection of the second capacitor C 2.

Field effect transistor 2 is depletion field effect transistor, and in the utility model, most important part is controlled by 2 pairs of power supplys that output to LED lamp 2 of field effect transistor, and the circuit implementation is simple, has reduced production cost.

A specific embodiment of the present utility model is as follows:

With reference to Fig. 2, a kind of LED drive circuit based on field effect transistor, for driving LED lamp D2, comprise rectification circuit 1, fuse F, field effect transistor 2, bleeder circuit 3, inductance L, the first resistance R 1, diode D1, the first capacitor C 1 and the second capacitor C 2;

The output of rectification circuit 1 is connected with the end of fuse F, the other end of fuse F is connected with the grid of field effect transistor 2 and the first link of bleeder circuit 3 respectively, the drain electrode of field effect transistor 2 is connected with the second link of bleeder circuit 3, the 3rd link ground connection of bleeder circuit 3, the source electrode of field effect transistor 2 is connected with an end of inductance L and the negative pole of diode D1 respectively, the other end of inductance L is connected with the first link of bleeder circuit 3 and an end of the first resistance R 1 respectively, the other end ground connection of the first resistance R 1, the positive pole of diode D1 is by the first capacitor C 1 ground connection, the first capacitor C 1 two ends are in parallel with LED lamp D2, one end of the second capacitor C 2 is connected with the first link of bleeder circuit 3, the other end ground connection of the second capacitor C 2,

Bleeder circuit 3 comprises the second resistance R 2 and adjustable resistance R3, the first link that one end of the second resistance R 2 is bleeder circuit 3, the other end of the second resistance R 2 and the second link that the end of adjustable resistance R3 is connected and connected node is bleeder circuit 3, the 3rd link that the other end of adjustable resistance R3 is bleeder circuit 3.

Field effect transistor 2 is depletion field effect transistor, and in the utility model, most important part is controlled by 2 pairs of power supplys that output to LED lamp 2 of field effect transistor, and the circuit implementation is simple, has reduced production cost.Adopt the second resistance R 2 and adjustable resistance R3 to form bleeder circuit, for the drain electrode of field effect transistor 2 provides suitable voltage, thereby can control the work of field effect transistor 2.

More than that better enforcement of the present utility model is illustrated, but the utility model is created and is not limited to embodiment, those of ordinary skill in the art also can make all equivalent variations or replacement under the prerequisite without prejudice to the utility model spirit, and the modification that these are equal to or replacement all are included in the application's claim limited range.

Claims

1. the LED drive circuit based on field effect transistor, for driving LED lamp (D2), it is characterized in that, comprise rectification circuit (1), fuse (F), field effect transistor (2), bleeder circuit (3), inductance (L), the first resistance (R1), diode (D1) and the first electric capacity (C1);

The output of described rectification circuit (1) is connected with an end of fuse (F), the other end of described fuse (F) is connected with the grid of field effect transistor (2) and the first link of bleeder circuit (3) respectively, the drain electrode of described field effect transistor (2) is connected with the second link of bleeder circuit (3), the 3rd link ground connection of described bleeder circuit (3), the source electrode of described field effect transistor (2) is connected with an end of inductance (L) and the negative pole of diode (D1) respectively, the other end of described inductance (L) is connected with the first link of bleeder circuit (3) and an end of the first resistance (R1) respectively, the other end ground connection of described the first resistance (R1), the positive pole of described diode (D1) is by the first electric capacity (C1) ground connection, described the first electric capacity (C1) two ends are in parallel with LED lamp (D2).

2. a kind of LED drive circuit based on field effect transistor according to claim 1, it is characterized in that, also comprise the second electric capacity (C2), an end of described the second electric capacity (C2) is connected with the first link of bleeder circuit (3), the other end ground connection of described the second electric capacity (C2).

3. a kind of LED drive circuit based on field effect transistor according to claim 1, it is characterized in that, described bleeder circuit (3) comprises the second resistance (R2) and adjustable resistance (R3), the first link that one end of described the second resistance (R2) is bleeder circuit (3), second link that one end is connected and connected node is bleeder circuit (3) of the other end of described the second resistance (R2) and adjustable resistance (R3), the 3rd link that the other end of described adjustable resistance (R3) is bleeder circuit (3).