CN205490208U

CN205490208U - High -efficient anti -reverse connection circuit based on LED external power supply

Info

Publication number: CN205490208U
Application number: CN201620102868.7U
Authority: CN
Inventors: 刘俊杰; 罗杨洋; 罗吉国; 陈兴国; 杨海涛
Original assignee: Shenzhen Horn Photoelectric Lighting Co Ltd
Current assignee: Shenzhen Horn Photoelectric Lighting Co Ltd
Priority date: 2016-02-01
Filing date: 2016-02-01
Publication date: 2016-08-17
Anticipated expiration: 2026-02-01

Abstract

The utility model discloses a high -efficient anti -reverse connection circuit based on LED external power supply, include the rectifier bridge that becomes by the MOS nest of tubes with the protection circuit of MOS pipe, protection circuit connection the MOS pipe, external power supply is connected to the input of rectifier bridge, LED is connected to the output of rectifier bridge, this circuit adopts the switching element of the MOS pipe conduct rectifier bridge of low -power consumption, introduces the protection circuit of the normal work of guarantee MOS pipe simultaneously, the utility model discloses can effectively prevent the problem that the LED fluorescent tube burns out because of the transposition, the circuit is reliable and stable, and the low power dissipation has improved the efficiency of power and LED's light efficiency.

Description

A kind of efficient reverse-connection preventing circuit based on LED external power supply

Technical field

This utility model relates to reverse-connection preventing circuit field, particularly relates to a kind of based on LED external power supply efficient Reverse-connection preventing circuit.

Background technology

Along with the rise of LED illumination industry, uneven LED illumination instrument of all kinds constantly occurs, But only green, energy-saving and environmental protection, efficient LED are only and meet social sustainable development.At present, On market, the power supply of almost all of LED is all that employing is built-in, compared with built-in power, and external power supply Not only efficiency is high, the life-span is long, and can increase hand-operating light or the function such as with an automatic light meter, enjoys client Like.But, external power supply burns the problem of fluorescent tube when there is reversal connection, need some additional circuits to prevent Reverse power connection, conventional reverse-connection preventing circuit typically uses rectifier bridge, diode contour loss device, these Components and parts have a defect heavy losses power-efficient the most fatal, and LED light effect is serious loses, and makes Become wasting of electric energy and luminous energy.

Utility model content

The purpose of this utility model is to propose a kind of efficient reverse-connection preventing circuit based on LED external power supply, should Circuit can effectively prevent the problem that LED lamp tube is burnt because of reversal connection, and circuit stability is reliable, low in energy consumption, improves The efficiency of power supply and the light efficiency of LED.

For reaching this purpose, this utility model by the following technical solutions:

A kind of efficient reverse-connection preventing circuit based on LED external power supply, including the rectifier bridge being made up of metal-oxide-semiconductor With the protection circuit of described metal-oxide-semiconductor, described protection circuit connects described metal-oxide-semiconductor, described rectifier bridge defeated Entering end and connect external power supply, the outfan of described rectifier bridge connects LED.

Wherein, described rectifier bridge includes two PMOS and two NMOS tube, the respectively the oneth PMOS Pipe, the second PMOS, the first NMOS tube and the second NMOS tube, the positive pole of described civil power connects institute State drain electrode and the drain electrode of described first NMOS tube, the source electrode of described first PMOS of the first PMOS Connecting the source electrode of described second PMOS, the drain electrode of described second PMOS connects described 2nd NMOS The drain electrode of pipe, the source electrode of described two NMOS tube connects the source electrode of described first NMOS tube, described civil power Negative pole connects the drain electrode of described second NMOS tube.

Wherein, described protection circuit includes the grid source protection electricity between grid and the source electrode of each described metal-oxide-semiconductor Drain-source protection circuit between road, and drain electrode and source electrode.

Wherein, described grid protection circuit divider resistance includes R2, R3, R8 and R9, wherein, and R2's The two ends of source electrode and grid, R3 that two ends connect described first PMOS respectively connect described second respectively The two ends of the source electrode of PMOS and grid, R9 connect source electrode and the grid of described first NMOS tube respectively, The two ends of R8 connect source electrode and the grid of described second NMOS tube respectively.

Wherein, described drain-source protection circuit includes divider resistance R1, R4, R5, R6, R7 and R10, R1 One end connect one end and the drain electrode of described first PMOS, the other end of R1 of described external power supply respectively Connecting source electrode and the source electrode of described second PMOS of described first PMOS respectively, the two ends of R5 are respectively Connecting the grid of described first PMOS and described second PMOS drain electrode, one end of R4 connects described the The grid of two PMOS, the other end of R4 connects the two ends of external power supply respectively, and the two ends of R6 connect respectively Connecing grid and the drain electrode of described second NMOS tube of described first NMOS tube, one end of R7 connects described The grid of the second NMOS tube, the other end of R7 connects the two ends of external power supply respectively, and one end of R10 connects The drain electrode of described first NMOS tube, the other end of R10 connects the negative pole of described civil power.

Wherein, the source electrode of described first PMOS connects the positive pole of described LED, described 2nd NMOS The source electrode of pipe connects the negative pole of described LED.

The beneficial effect that the technical scheme that this utility model provides is brought:

This utility model efficient reverse-connection preventing circuit based on LED external power supply, including be made up of metal-oxide-semiconductor Rectifier bridge and the protection circuit of described metal-oxide-semiconductor, described protection circuit connects described metal-oxide-semiconductor, described rectification The input of bridge connects external power supply, and the outfan of described rectifier bridge connects LED；This circuit uses low-power consumption Metal-oxide-semiconductor as the switching device of rectifier bridge, be simultaneously introduced the protection electricity of the normal work ensureing metal-oxide-semiconductor Road；This utility model can effectively prevent the problem that LED lamp tube is burnt because of reversal connection, and circuit stability is reliable, merit Consume low, improve the efficiency of power supply and the light efficiency of LED.

Accompanying drawing explanation

Fig. 1 is the merit of based on LED external power supply the efficient reverse-connection preventing circuit that this utility model embodiment provides Can schematic diagram.

Fig. 2 is the electricity of based on LED external power supply the efficient reverse-connection preventing circuit that this utility model embodiment provides Line structure figure.

Fig. 3 is the electricity of based on LED external power supply the efficient reverse-connection preventing circuit that this utility model embodiment provides Lu Tu.

Fig. 4 is the collection of based on LED external power supply the efficient reverse-connection preventing circuit that this utility model embodiment provides Become circuit diagram.

Detailed description of the invention

The technical solution of the utility model is further illustrated referring to figs. 1 through Fig. 4 and by detailed description of the invention.

The outfan correspondence of the external power supply of LED connects the both positive and negative polarity of LED, if there is reversal connection LED meeting Being burned out, it is noted that the problem of polarity during installing, LED is as a kind of domestic necessary article, warp Being often to be changed by user oneself or installed, the basis that polarity may be connected by user as ordinary consumer is normal Know and unclear, the problem being in this case possible to fluorescent tube reversal connection；Embodiment of the present utility model, Access a reverse-connection preventing circuit by the outfan at external power supply, power to LED the most again, can be effective The generation avoiding reversal connection.

The rectifier bridge that this reverse-connection preventing circuit is made up of metal-oxide-semiconductor is constituted, no matter the alternating voltage of external power supply output The most rectified bridge of polarity process after all become the voltage output of same polarity, the outfan of rectifier bridge is solid Surely the input connecting LED is its power supply, and this reverse-connection preventing circuit is arranged in LED lamp tube, and user is changing Or the problem avoiding the need for during mounted LED lamp pipe noting polarity, it is to avoid potential safety hazard；Simultaneously In this rectifier bridge, each metal-oxide-semiconductor is provided with protection circuit, ensures that it runs safety, the switch of metal-oxide-semiconductor It is lost little, is effectively increased the efficiency of power supply and the light efficiency of LED.

Described rectifier bridge includes two PMOS and two NMOS tube, the respectively first PMOS Q1-1, Second PMOS Q2-1, the first NMOS tube Q1-2 and the second NMOS tube Q2-2, described civil power Positive pole connects drain electrode and the drain electrode of described first NMOS tube Q1-2, the institute of described first PMOS Q1-1 State the first PMOS Q1-1 source electrode connect described second PMOS Q2-1 source electrode, described second The drain electrode of PMOS Q2-1 connects the drain electrode of described second NMOS tube Q2-2, described two NMOS tube Source electrode connects the source electrode of described first NMOS tube Q1-2, and the negative pole of described civil power connects described 2nd NMOS The drain electrode of pipe Q2-2.

Described protection circuit includes the grid protection circuit between grid and the source electrode of each described metal-oxide-semiconductor, with And the drain-source protection circuit between drain electrode and source electrode.

Due to the characteristic of diode, the gate source voltage V of metal-oxide-semiconductor_GSWith drain-source voltage V_DSNeeds control one Fixed voltage range, embodiment of the present utility model guarantees difference by adding the divider resistance of different resistance Metal-oxide-semiconductor can normally work.

Described grid protection circuit divider resistance includes R2, R3, R8 and R9, and wherein, the two ends of R2 are divided Not connecting source electrode and the grid of described first PMOS Q1-1, the two ends of R3 connect described second respectively The source electrode of PMOS Q2-1 and grid, the two ends of R9 connect the source of described first NMOS tube Q1-2 respectively Pole and grid, the two ends of R8 connect source electrode and the grid of described second NMOS tube Q2-2 respectively.

Described drain-source protection circuit includes divider resistance R1, R4, R5, R6, R7 and R10, one end of R1 Connect one end and the drain electrode of described first PMOS Q1-1, the other end of R1 of described external power supply respectively Connect source electrode and the source electrode of described second PMOS Q2-1, the R5 of described first PMOS Q1-1 respectively Two ends connect respectively described first PMOS Q1-1 grid and described second PMOS Q2-1 drain electrode, One end of R4 connects the grid of described second PMOS Q2-1, and the other end of R4 connects external power supply respectively Two ends, the two ends of R6 connect the grid of described first NMOS tube Q1-2 and described 2nd NMOS respectively The drain electrode of pipe Q2-2, one end of R7 connects the grid of described second NMOS tube Q2-2, the other end of R7 Connecting the two ends of external power supply respectively, one end of R10 connects the drain electrode of described first NMOS tube Q1-2, The other end of R10 connects the negative pole of described civil power.

The present embodiment can also be realized by integrated circuit, as shown in Figure 4, and its chips U1 and chip U2 is the integrated chip being integrated with a PMOS and a NMOS tube.The metal-oxide-semiconductor of corresponding diagram 3 Protection circuit, chip U1 is integrated with the first PMOS Q1-1 and the first NMOS tube Q1-2, chip U2 is integrated with the second PMOS Q2-1 and the second NMOS tube Q2-2.

The source electrode of described first PMOS Q1-1 connects the positive pole of described LED, described second NMOS tube The source electrode of Q2-2 connects the negative pole of described LED.

To sum up, this utility model efficient reverse-connection preventing circuit based on LED external power supply, use low-power consumption Metal-oxide-semiconductor, as the switching device of rectifier bridge, is simultaneously introduced the dividing potential drop protection of the normal work ensureing metal-oxide-semiconductor Circuit；This circuit can effectively prevent the problem that LED lamp tube is burnt because of reversal connection, and circuit stability is reliable, power consumption Low, volume I is integrated, improves the efficiency of power supply and the light efficiency of LED.

The above, only this utility model preferably detailed description of the invention, but protection model of the present utility model Enclose and be not limited thereto, any be familiar with the people of this technology in the technical scope disclosed by this utility model, can The change readily occurred in or replacement, all should contain within protection domain of the present utility model.Therefore, this reality Should be as the criterion with scope of the claims with novel protection domain.

Claims

1. an efficient reverse-connection preventing circuit based on LED external power supply; it is characterized in that, including the rectifier bridge being made up of metal-oxide-semiconductor and the protection circuit of described metal-oxide-semiconductor, described protection circuit connects described metal-oxide-semiconductor; the input of described rectifier bridge connects external power supply, and the outfan of described rectifier bridge connects LED.

Circuit the most according to claim 1, it is characterized in that, described rectifier bridge includes two PMOS and two NMOS tube, it is respectively the first PMOS, second PMOS, first NMOS tube and the second NMOS tube, the positive pole of civil power connects drain electrode and the drain electrode of described first NMOS tube of described first PMOS, the source electrode of described first PMOS connects the source electrode of described second PMOS, the drain electrode of described second PMOS connects the drain electrode of described second NMOS tube, the source electrode of described two NMOS tube connects the source electrode of described first NMOS tube, the negative pole of described civil power connects the drain electrode of described second NMOS tube.

Circuit the most according to claim 2, it is characterised in that described protection circuit includes the drain-source protection circuit between the grid protection circuit between grid and the source electrode of each described metal-oxide-semiconductor, and drain electrode and source electrode.

Circuit the most according to claim 3; it is characterized in that; described grid protection circuit includes divider resistance R2, R3, R8 and R9; wherein; the two ends of source electrode and grid, R9 that the two ends of source electrode and grid, R3 that the two ends of R2 connect described first PMOS respectively connect described second PMOS respectively connect source electrode and the grid of described first NMOS tube respectively, and the two ends of R8 connect source electrode and the grid of described second NMOS tube respectively.

nullCircuit the most according to claim 4，It is characterized in that，Described drain-source protection circuit includes divider resistance R1、R4、R5、R6、R7 and R10，One end of R1 connects one end and the drain electrode of described first PMOS of described external power supply respectively，The other end of R1 connects source electrode and the source electrode of described second PMOS of described first PMOS respectively，The two ends of R5 connect the grid of described first PMOS and described second PMOS drain electrode respectively，One end of R4 connects the grid of described second PMOS，The other end of R4 connects the two ends of external power supply respectively，The two ends of R6 connect grid and the drain electrode of described second NMOS tube of described first NMOS tube respectively，One end of R7 connects the grid of described second NMOS tube，The other end of R7 connects the two ends of external power supply respectively，One end of R10 connects the drain electrode of described first NMOS tube，The other end of R10 connects the negative pole of civil power.

Circuit the most according to claim 2, it is characterised in that the source electrode of described first PMOS connects the positive pole of described LED, the source electrode of described second NMOS tube connects the negative pole of described LED.