CN101860021B - Circuit for preventing reverse connection of power supply and lamp - Google Patents

Circuit for preventing reverse connection of power supply and lamp Download PDF

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Publication number
CN101860021B
CN101860021B CN 201010147098 CN201010147098A CN101860021B CN 101860021 B CN101860021 B CN 101860021B CN 201010147098 CN201010147098 CN 201010147098 CN 201010147098 A CN201010147098 A CN 201010147098A CN 101860021 B CN101860021 B CN 101860021B
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CN
China
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described
voltage
stabiliser tube
power supply
oxide
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CN 201010147098
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Chinese (zh)
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CN101860021A (en
Inventor
周明杰
张成良
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海洋王照明科技股份有限公司
深圳市海洋王照明工程有限公司
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Priority to CN 201010147098 priority Critical patent/CN101860021B/en
Publication of CN101860021A publication Critical patent/CN101860021A/en
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Publication of CN101860021B publication Critical patent/CN101860021B/en

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Abstract

The invention is suitable for the field of the electronic circuit and provides a circuit for preventing reverse connection of a power supply. The circuit for preventing reverse connection of the power supply comprises an MOS tube control unit and an MOS tube, wherein the MOS tube control unit is connected between a positive input end of the power supply and a grid electrode of the MOS tube; a source electrode of the MOS tube is earthed; and a drain electrode of the MOS tube is connected with a negative input end of the power supply. The circuit for preventing reverse connection of the power supply, which is provided by the invention, can effectively prevent reverse connection. An on resistance of an MOS is small (can be milliohms) so as to reduce the power consumption of a main current circuit, improve efficiency of the whole circuit, reduce heat generation and improve reliability of a product applying the circuit.

Description

A kind of circuit for preventing reverse connection of power supply and light fixture

Technical field

The invention belongs to electronic circuit field, relate in particular to a kind of circuit for preventing reverse connection of power supply and light fixture.

Background technology

Wiring has the extensive use of light source in lighting field of requirement to the input power positive cathode along with LED and other, and the reverse-connection preventing circuit design of lamp power input also just seems very important in whole lamp circuit design.

Great majority are that to add diode in input circuit anti-reverse in the reverse-connection preventing circuit design of present light fixture input power supply, but the pressure drop of diode is very big, when the electric current of diode is big if flow through, the power consumption of diode will be very big, the temperature rise of diode will will have influence on the reliability of whole light fixture like this than higher.

Summary of the invention

The purpose of the embodiment of the invention is to provide a kind of circuit for preventing reverse connection of power supply, is intended to solve present power supply input reverse-connection preventing circuit power consumption height, the problem of poor reliability.

The embodiment of the invention is achieved in that circuit for preventing reverse connection of power supply comprises metal-oxide-semiconductor control unit and metal-oxide-semiconductor; Wherein said metal-oxide-semiconductor control unit is connected between the grid of the positive input terminal of power supply and described metal-oxide-semiconductor, the source ground of described metal-oxide-semiconductor, and the drain electrode of described metal-oxide-semiconductor is connected with the negative input end of power supply;

Described metal-oxide-semiconductor control unit comprises first voltage-stabiliser tube, second voltage-stabiliser tube, the 3rd voltage-stabiliser tube, triode, first resistance and second resistance;

Described first voltage-stabiliser tube, described second voltage-stabiliser tube are serially connected between the collector electrode of power supply positive input terminal and described triode successively, the negative electrode of wherein said first voltage-stabiliser tube connects the power supply positive input terminal, anode connects the negative electrode of described second voltage-stabiliser tube, and the anode of described second voltage-stabiliser tube is connected to the collector electrode of described triode; The anode of described first voltage-stabiliser tube connects the negative electrode of described the 3rd voltage-stabiliser tube by described second resistance, the plus earth of described the 3rd voltage-stabiliser tube, the negative electrode of described the 3rd voltage-stabiliser tube connects the base stage of triode simultaneously, the emitter of described triode is connected with load, and the node between the emitter of described triode and the described load is connected to the grid of described metal-oxide-semiconductor by first resistance.

The embodiment of the invention also provides a kind of light fixture, comprises the power circuit of light source and the described light source of driving, and described power circuit comprises a circuit for preventing reverse connection of power supply; Described circuit for preventing reverse connection of power supply comprises metal-oxide-semiconductor control unit and metal-oxide-semiconductor; Wherein said metal-oxide-semiconductor control unit is connected between the grid of the positive input terminal of power supply and described metal-oxide-semiconductor, the source ground of described metal-oxide-semiconductor, and the drain electrode of described metal-oxide-semiconductor is connected with the negative input end of power supply;

Described metal-oxide-semiconductor control unit comprises first voltage-stabiliser tube, second voltage-stabiliser tube, the 3rd voltage-stabiliser tube, triode, first resistance and second resistance;

Described first voltage-stabiliser tube, described second voltage-stabiliser tube are serially connected between the collector electrode of power supply positive input terminal and described triode successively, the negative electrode of wherein said first voltage-stabiliser tube connects the power supply positive input terminal, anode connects the negative electrode of described second voltage-stabiliser tube, and the anode of described second voltage-stabiliser tube is connected to the collector electrode of described triode; The anode of described first voltage-stabiliser tube connects the negative electrode of described the 3rd voltage-stabiliser tube by described second resistance, the plus earth of described the 3rd voltage-stabiliser tube, the negative electrode of described the 3rd voltage-stabiliser tube connects the base stage of triode simultaneously, the emitter of described triode is connected with load, and the node between the emitter of described triode and the described load is connected to the grid of described metal-oxide-semiconductor by first resistance.

The circuit for preventing reverse connection of power supply that the embodiment of the invention provides can be effectively anti-reverse, because the conducting resistance very little (can accomplish several milliohms) of metal-oxide-semiconductor, thereby reduce the power consumption of main current loop, improve the efficient of entire circuit, the minimizing heating has improved light fixture or other use the reliability of products of this circuit.

Description of drawings

Fig. 1 is the structure principle chart of the circuit for preventing reverse connection of power supply that provides of the embodiment of the invention;

Fig. 2 is a kind of concrete structure figure of metal-oxide-semiconductor control unit in the circuit shown in Figure 1.

Embodiment

In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the present invention, and be not used in restriction the present invention.

In the embodiment of the invention, adopt the littler metal-oxide-semiconductor of conduction voltage drop to control the break-make of main circuit current, wherein the metal-oxide-semiconductor grid voltage is obtained by the dividing potential drop sampling to supply voltage, and the dividing potential drop of this supply voltage is given follow-up load power supply simultaneously.

Fig. 1 shows the structural principle of the circuit for preventing reverse connection of power supply that the embodiment of the invention provides, and for convenience of description, only shows the part relevant with present embodiment.

With reference to Fig. 1, circuit for preventing reverse connection of power supply comprises metal-oxide-semiconductor control unit 1, load RL and metal-oxide-semiconductor Q, J1 among Fig. 1, J2 represent the positive and negative input of power supply respectively, the power input of metal-oxide-semiconductor control unit 1 is connected on the bus a that the positive input terminal J1 by power supply draws, power output end is connected to the grid of metal-oxide-semiconductor Q, for metal-oxide-semiconductor Q conducting provides forward 12V conducting voltage, earth terminal is connected to GND; Load RL be connected in that bus a that the positive input terminal J1 of power supply draws goes up in parallel or the grid of metal-oxide-semiconductor Q and loop that metal-oxide-semiconductor Q source electrode constitutes between, between the source electrode of the grid of the positive input terminal J1 of power supply or metal-oxide-semiconductor Q and metal-oxide-semiconductor Q, form the parallel circuits structure, the source electrode of metal-oxide-semiconductor Q meets GND, drain electrode then is connected with the negative input end J2 of power supply, and the electromotive force of the negative input end J2 of power supply is lower than zero potential GND during operate as normal; Wherein, the bus a that the positive input terminal J1 of power supply draws goes up the voltage that 24V is provided for load RL, and this voltage is exported 12V voltage to the grid of metal-oxide-semiconductor Q after coordination and control through metal-oxide-semiconductor control unit 1, also provides 12V voltage for follow-up load circuit simultaneously.

Fig. 2 is a kind of concrete structure of metal-oxide-semiconductor control unit in the circuit shown in Figure 1.With reference to Fig. 2, metal-oxide-semiconductor control unit 1 need comprise the first voltage-stabiliser tube ZD1, the second voltage-stabiliser tube ZD2, the 3rd voltage-stabiliser tube ZD3, triode Q1, first resistance R 1 and second resistance R 2 at least.The first voltage-stabiliser tube ZD1, the second voltage-stabiliser tube ZD2 are serially connected between the collector electrode of power supply positive input terminal J1 and triode Q1 successively, wherein the negative electrode of the first voltage-stabiliser tube ZD1 connects power supply positive input terminal J1, anode connects the negative electrode of the second voltage-stabiliser tube ZD2, and the anode of the second voltage-stabiliser tube ZD2 is connected to the collector electrode of triode Q1.The anode of the first voltage-stabiliser tube ZD1 is by the negative electrode of second resistance R, 2 connections the 3rd voltage-stabiliser tube ZD3, the plus earth of the 3rd voltage-stabiliser tube ZD3; The negative electrode of the 3rd voltage-stabiliser tube ZD3 connects the base stage of triode Q1 simultaneously, and the emitter of triode Q1 is connected with load RL.The grid that is connected to metal-oxide-semiconductor Q by first resistance R 1 at emitter and the node A between the load RL of triode Q1; the source ground GND of metal-oxide-semiconductor Q; drain electrode then is connected with the negative input end J2 of power supply, simultaneously the 3rd resistance R 3 of a protective effect in parallel between source electrode and grid.

The first voltage-stabiliser tube ZD1, the second voltage-stabiliser tube ZD2, second resistance R 2 are that the 24V input voltage is carried out dividing potential drop, make voltage control on the 3rd voltage-stabiliser tube ZD3 circuit in the 12V voltage range that the 3rd voltage-stabiliser tube ZD3 can hold, guarantee reliability and the life-span of ZD3, voltage stabilizing by the 3rd voltage-stabiliser tube ZD3, thereby guarantee that the voltage constant of triode Q1 base stage is about 12V, wherein, first resistance R 1 plays metering function, be used for restriction and flow through the size of current of metal-oxide-semiconductor Q grid, thereby reduce the power consumption of entire circuit, improve the efficient of entire circuit; 2 metering functions of second resistance R are used for the base current size that triode Q1 is flow through in restriction, thereby the electric current that assurance triode Q1 flows through is no more than the load current value of triode Q1, and protection triode Q1 avoids it to burn out because circuital current is excessive; Triode Q1 plays the electric current amplification, the first voltage-stabiliser tube ZD1, the second voltage-stabiliser tube ZD2 with the voltage voltage stabilizing of place circuit at 3.6V; And the 3rd voltage-stabiliser tube ZD3 is used for the voltage voltage stabilizing on the triode Q1 base stage at 12V, belong to rest potential (can provide 12V voltage for follow-up load behind the circuit forward conduction) at this 12V voltage of circuit powered on moment, forward 12V bias voltage is provided for metal-oxide-semiconductor Q, and by current-limiting resistance R1 (resistance is 360 kilohms), the electric current on the metal-oxide-semiconductor Q grid is limited in about 0.03mA.

When the input power supply inserts when correct, and powered on moment influences because of rest potential, the quiescent voltage of a 12V of 1 output of metal-oxide-semiconductor control unit, and this moment, this metal-oxide-semiconductor control unit 1 place circuit no current passed through.The 12V quiescent voltage that metal-oxide-semiconductor control unit 1 obtains at node A is delivered to the grid of metal-oxide-semiconductor Q by first resistance R 1 that plays metering function, thereby make metal-oxide-semiconductor obtain a 12V forward conduction quiescent voltage, metal-oxide-semiconductor Q conducting this moment, with form closed loop by power input J1, the sense of current of metal-oxide-semiconductor Q is by then flowing to power input J2 by GND, thereby the current circuit conducting of whole power circuit, and metal-oxide-semiconductor control unit 1 place circuit will become a power supply that is about 100mA/12V this moment; Another power supply that 12V voltage so just can bio-occlusion load RL2 circuit be provided.

If input power supply misconnection, then metal-oxide-semiconductor Q grid can't obtain the static forward bias voltage of 12V, thus metal-oxide-semiconductor Q end, thereby the not conducting of whole current circuit and then is played the effect of protection subsequent conditioning circuit.

Further, connect by inductance L 1 and/or protective tube F between the negative electrode of power supply positive input terminal J1 and the first voltage-stabiliser tube ZD1, wherein inductance L 1 plays the afterflow effect; can prevent current break in the circuit; protective circuit, protective tube F can prevent that electric current is excessive in the circuit, equally can protective circuit.

Further, the negative electrode of the first voltage-stabiliser tube ZD1 can also pass through the first filter capacitor C1 ground connection, and in like manner, the emitter of triode Q1 also can pass through the second filter capacitor C1 ground connection, and effect is eliminates circuit ripple, protective circuit.

Above-mentioned circuit for preventing reverse connection of power supply can be applied in the power circuit of light fixture, and especially the wiring to power positive cathode of LED and so on has the light fixture of requirement, can effectively improve the light fixture reliability of products.

In the embodiment of the invention; adopt the littler metal-oxide-semiconductor of conduction voltage drop to control the break-make of main circuit current; wherein the metal-oxide-semiconductor grid voltage is obtained by the dividing potential drop sampling to supply voltage; the dividing potential drop of this supply voltage is given follow-up load power supply simultaneously; the metal-oxide-semiconductor conducting makes major loop have electric current to produce and can further give follow-up load RL power supply when power supply just connects; metal-oxide-semiconductor turn-offs then no current of major loop when the power supply reversal connection, thereby can protect follow-up load circuit.Since the conducting resistance very little (can accomplish several milliohms) of metal-oxide-semiconductor, thereby the power consumption of reduction main current loop, the efficient of raising entire circuit, and the minimizing heating improves light fixture or other use the reliability of products of this circuit.

The above only is preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.

Claims (9)

1. a circuit for preventing reverse connection of power supply is characterized in that, comprises metal-oxide-semiconductor control unit and metal-oxide-semiconductor; Wherein said metal-oxide-semiconductor control unit is connected between the grid of the positive input terminal of power supply and described metal-oxide-semiconductor, the source ground of described metal-oxide-semiconductor, and the drain electrode of described metal-oxide-semiconductor is connected with the negative input end of power supply;
Described metal-oxide-semiconductor control unit comprises first voltage-stabiliser tube, second voltage-stabiliser tube, the 3rd voltage-stabiliser tube, triode, first resistance and second resistance;
Described first voltage-stabiliser tube, described second voltage-stabiliser tube are serially connected between the collector electrode of power supply positive input terminal and described triode successively, the negative electrode of wherein said first voltage-stabiliser tube connects the power supply positive input terminal, anode connects the negative electrode of described second voltage-stabiliser tube, and the anode of described second voltage-stabiliser tube is connected to the collector electrode of described triode; The anode of described first voltage-stabiliser tube connects the negative electrode of described the 3rd voltage-stabiliser tube by described second resistance, the plus earth of described the 3rd voltage-stabiliser tube, the negative electrode of described the 3rd voltage-stabiliser tube connects the base stage of triode simultaneously, the emitter of described triode is connected with load, and the node between the emitter of described triode and the described load is connected to the grid of described metal-oxide-semiconductor by first resistance.
2. circuit for preventing reverse connection of power supply as claimed in claim 1 is characterized in that, the negative electrode of power supply positive input terminal and described first voltage-stabiliser tube is connected by inductance and/or protective tube.
3. circuit for preventing reverse connection of power supply as claimed in claim 1 is characterized in that, the negative electrode of described first voltage-stabiliser tube is by the first filter capacitor ground connection.
4. circuit for preventing reverse connection of power supply as claimed in claim 1 is characterized in that, the emitter of described triode is by the second filter capacitor ground connection.
5. a light fixture comprises light source and the power circuit that drives described light source, and described power circuit comprises a circuit for preventing reverse connection of power supply; It is characterized in that described circuit for preventing reverse connection of power supply comprises metal-oxide-semiconductor control unit and metal-oxide-semiconductor; Wherein said metal-oxide-semiconductor control unit is connected between the grid of the positive input terminal of power supply and described metal-oxide-semiconductor, the source ground of described metal-oxide-semiconductor, and the drain electrode of described metal-oxide-semiconductor is connected with the negative input end of power supply;
Described metal-oxide-semiconductor control unit comprises first voltage-stabiliser tube, second voltage-stabiliser tube, the 3rd voltage-stabiliser tube, triode, first resistance and second resistance;
Described first voltage-stabiliser tube, described second voltage-stabiliser tube are serially connected between the collector electrode of power supply positive input terminal and described triode successively, the negative electrode of wherein said first voltage-stabiliser tube connects the power supply positive input terminal, anode connects the negative electrode of described second voltage-stabiliser tube, and the anode of described second voltage-stabiliser tube is connected to the collector electrode of described triode; The anode of described first voltage-stabiliser tube connects the negative electrode of described the 3rd voltage-stabiliser tube by described second resistance, the plus earth of described the 3rd voltage-stabiliser tube, the negative electrode of described the 3rd voltage-stabiliser tube connects the base stage of triode simultaneously, the emitter of described triode is connected with load, and the node between the emitter of described triode and the described load is connected to the grid of described metal-oxide-semiconductor by first resistance.
6. light fixture as claimed in claim 5 is characterized in that, the negative electrode of described power supply positive input terminal and described first voltage-stabiliser tube is connected by inductance and/or protective tube.
7. light fixture as claimed in claim 5 is characterized in that, the negative electrode of described first voltage-stabiliser tube is by the first filter capacitor ground connection.
8. light fixture as claimed in claim 5 is characterized in that, the emitter of described triode is by the second filter capacitor ground connection.
9. light fixture as claimed in claim 5 is characterized in that, described light source is LED.
CN 201010147098 2010-04-09 2010-04-09 Circuit for preventing reverse connection of power supply and lamp CN101860021B (en)

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Application Number Priority Date Filing Date Title
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CN101860021B true CN101860021B (en) 2013-07-03

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Publication number Priority date Publication date Assignee Title
CN103683264B (en) * 2012-08-30 2017-10-13 深圳市海洋王照明工程有限公司 A kind of anti-reverse connection circuit of direct current power supply and light fixture
CN104134971B (en) * 2013-05-03 2017-10-13 海洋王(东莞)照明科技有限公司 A kind of battery reversal connection warning circuit and electronic equipment
CN104426145B (en) * 2013-09-09 2018-09-11 海洋王(东莞)照明科技有限公司 Prevent reversed circuit and lamps and lanterns
CN103647339B (en) * 2013-12-20 2015-10-28 广东威创视讯科技股份有限公司 Many power sources in parallel electric supply installation
CN104037751B (en) * 2014-06-04 2016-09-21 西安电子工程研究所 Millimetre-wave radar receiving front-end power protecting circuit
CN106937435B (en) * 2015-12-31 2018-10-30 赛尔富电子有限公司 A kind of nonpolarity rectification circuit
TWI594111B (en) * 2016-01-28 2017-08-01 廣達電腦股份有限公司 Electronic device
CN105634263A (en) * 2016-04-12 2016-06-01 上海斐讯数据通信技术有限公司 Protection circuit self-adaptive to input voltage

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CN201234134Y (en) * 2008-06-26 2009-05-06 中兴通讯股份有限公司 Protection circuit for electric power polarity reverse connection
CN201256290Y (en) * 2008-08-04 2009-06-10 研祥智能科技股份有限公司 Protection circuit for suppressing surge current and preventing input voltage reverse connection

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JP4483751B2 (en) * 2005-09-16 2010-06-16 株式会社デンソー Power supply reverse connection protection circuit

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CN201234134Y (en) * 2008-06-26 2009-05-06 中兴通讯股份有限公司 Protection circuit for electric power polarity reverse connection
CN201256290Y (en) * 2008-08-04 2009-06-10 研祥智能科技股份有限公司 Protection circuit for suppressing surge current and preventing input voltage reverse connection

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