CN101860999B - Circuit for preventing reverse connection of power supply, LED lamp circuit and LED lamp - Google Patents
Circuit for preventing reverse connection of power supply, LED lamp circuit and LED lamp Download PDFInfo
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- CN101860999B CN101860999B CN2010101403232A CN201010140323A CN101860999B CN 101860999 B CN101860999 B CN 101860999B CN 2010101403232 A CN2010101403232 A CN 2010101403232A CN 201010140323 A CN201010140323 A CN 201010140323A CN 101860999 B CN101860999 B CN 101860999B
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Abstract
The invention is suitable for the field of the LED lamps and provides a circuit for preventing reverse connection of a power supply, an LED lamp circuit and an LED lamp. The circuit for preventing reverse connection of the power supply comprises a switching device and a voltage bias module. In the invention, the circuit for preventing reverse connection of the power supply adopts an MOS tube as the switching device. When the power supply is connected reversely, the switching property of the MOS tube is utilized to switch off a power path of the LED lamp circuit so as to play a role of preventing reverse connection of the power supply. The MOS tube has small internal resistance and small voltage drop, thus, the power consumption of the circuit is small.
Description
Technical field
The invention belongs to the LED field of light fittings, relate in particular to a kind of circuit for preventing reverse connection of power supply, LED lamp circuit and LED light fixture.
Background technology
In the electronic equipment that uses external power supply,, if the power supply of electronic equipment connects instead, can cause the permanent damage of electronic equipment.
Present circuit for preventing reverse connection of power supply adopts diode, utilizes the one-way conduction characteristic of diode to reach the purpose that prevents reverse power connection damage electronic equipment.But,, because the pressure drop of diode is fixed, cause the power of its consumption excessive, produce heat, cause circuit stability to reduce.
Summary of the invention
The purpose of the embodiment of the present invention is to provide a kind of circuit for preventing reverse connection of power supply, is intended to solve existing circuit for preventing reverse connection of power supply and adopts diode to have the large problem of power consumption.
The embodiment of the present invention is to realize like this, a kind of circuit for preventing reverse connection of power supply, described circuit for preventing reverse connection of power supply comprises a switching device and a voltage bias module, the output termination power cathode of described switching device, the input of described switching device connects the positive source electrode of LED lamp circuit by the voltage bias module, the negative source electrode of the control termination LED lamp circuit of described switching device;
Described switching device adopts the first metal-oxide-semiconductor, and the drain electrode of described the first metal-oxide-semiconductor connects power cathode, and the source electrode of described the first metal-oxide-semiconductor connects the positive source electrode of LED lamp circuit by the voltage bias module, and the grid of described the first metal-oxide-semiconductor connects the negative source electrode of LED lamp circuit;
Described voltage bias module comprises the second metal-oxide-semiconductor and diode, the source electrode of described the second metal-oxide-semiconductor connects the source electrode of described the first metal-oxide-semiconductor, the grounded drain of described the second metal-oxide-semiconductor, the grid of described the second metal-oxide-semiconductor connects the negative electrode of diode, and the anode of described diode connects the positive source electrode of LED lamp circuit.
Another purpose of the embodiment of the present invention is to provide a kind of LED lamp circuit, described LED lamp circuit comprises circuit for preventing reverse connection of power supply, described circuit for preventing reverse connection of power supply comprises a switching device and a voltage bias module, the output termination power cathode of described switching device, the input of described switching device connects the positive source electrode of LED lamp circuit by the voltage bias module, the negative source electrode of the control termination LED lamp circuit of described switching device;
Described switching device adopts the first metal-oxide-semiconductor, and the drain electrode of described the first metal-oxide-semiconductor connects power cathode, and the source electrode of described the first metal-oxide-semiconductor connects the positive source electrode of LED lamp circuit by the voltage bias module, and the grid of described the first metal-oxide-semiconductor connects the negative source electrode of LED lamp circuit;
Described voltage bias module comprises the second metal-oxide-semiconductor and diode, the source electrode of described the second metal-oxide-semiconductor connects the source electrode of described the first metal-oxide-semiconductor, the grounded drain of described the second metal-oxide-semiconductor, the grid of described the second metal-oxide-semiconductor connects the negative electrode of diode, and the anode of described diode connects the positive source electrode of LED lamp circuit.
Another purpose of the embodiment of the present invention is to provide a kind of LED light fixture that comprises above-mentioned LED lamp circuit.
In embodiments of the present invention, this circuit for preventing reverse connection of power supply adopts metal-oxide-semiconductor as switching device, when power supply connects inverse time, utilize the switching characteristic of metal-oxide-semiconductor to disconnect the power path of LED lamp circuit, thereby play the effect of power supply reverse connection protection, and because the metal-oxide-semiconductor internal resistance is little, pressure drop is little, so its power consumption is little.
Description of drawings
Fig. 1 is the structure chart of the circuit for preventing reverse connection of power supply that provides of the embodiment of the present invention;
Fig. 2 is the exemplary circuit figure of the circuit for preventing reverse connection of power supply that provides of the embodiment of the present invention.
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 explain the present invention, is not intended to limit the present invention.
In the embodiment of the present invention, this circuit for preventing reverse connection of power supply adopts metal-oxide-semiconductor as switching device, when power supply connects inverse time, utilize the switching characteristic of metal-oxide-semiconductor to disconnect the power path of LED lamp circuit, thereby play the effect of power supply reverse connection protection, and because the metal-oxide-semiconductor internal resistance is little, pressure drop is little, so its power consumption is little.
Fig. 1 shows the structure of the circuit for preventing reverse connection of power supply that the embodiment of the present invention provides, and for convenience of explanation, only shows the part relevant to the embodiment of the present invention.
Circuit for preventing reverse connection of power supply comprises a switching device 100 and a voltage bias module 200, the output termination power cathode of switching device 100, the input of switching device 100 connects the positive source electrode of LED lamp circuit by voltage bias module 200, the negative source electrode of the control termination LED lamp circuit of switching device 100.
Fig. 2 shows the exemplary circuit structure of the circuit for preventing reverse connection of power supply that the embodiment of the present invention provides, and for convenience of explanation, only shows the part relevant to the embodiment of the present invention.
As one embodiment of the invention, switching device 100 adopts the first metal-oxide-semiconductor Q1, the drain electrode of the first metal-oxide-semiconductor Q1 connects power cathode, and the source electrode of the first metal-oxide-semiconductor Q1 connects the positive source electrode of LED lamp circuit by voltage bias module 200, and the grid of the first metal-oxide-semiconductor Q1 connects the negative source electrode of LED lamp circuit.
As one embodiment of the invention, voltage bias module 200 comprises the second metal-oxide-semiconductor Q2 and diode D1, the source electrode of the second metal-oxide-semiconductor Q2 connects the source electrode of the first metal-oxide-semiconductor Q1, the grounded drain of the second metal-oxide-semiconductor Q2, the grid of the second metal-oxide-semiconductor Q2 connects the negative electrode of diode D1, and the anode of diode D1 connects the positive source electrode of LED lamp circuit.
As one embodiment of the invention, circuit for preventing reverse connection of power supply also comprises the resistance R 1 between the negative source electrode of the grid that is connected to the first metal-oxide-semiconductor Q1 and LED lamp circuit.
The embodiment of the present invention also provides a kind of LED lamp circuit that comprises above-mentioned circuit for preventing reverse connection of power supply.
The embodiment of the present invention also provides a kind of LED light fixture that comprises above-mentioned LED lamp circuit.
The operation principle of this circuit for preventing reverse connection of power supply is:
When power supply normally accesses, voltage bias module 200 is for providing forward bias voltage between the grid of the first metal-oxide-semiconductor Q1 and source electrode, and the first metal-oxide-semiconductor Q1 conducting, have electric current to pass through between the drain electrode of the first metal-oxide-semiconductor Q1 and source electrode, the power path conducting of LED lamp circuit, the normal operation of LED light fixture;
When power supply connects inverse time, voltage bias module 200 is for providing reverse bias voltage between the grid of the first metal-oxide-semiconductor Q1 and source electrode, and the first not conducting of metal-oxide-semiconductor Q1, do not have electric current to pass through between the drain electrode of the first metal-oxide-semiconductor Q1 and source electrode, the power path of LED lamp circuit disconnects, and prevents that the LED light fixture is damaged.
In embodiments of the present invention, this circuit for preventing reverse connection of power supply adopts metal-oxide-semiconductor as switching device, when power supply connects inverse time, utilize the switching characteristic of metal-oxide-semiconductor to disconnect the power path of LED lamp circuit, thereby play the effect of power supply reverse connection protection, and because the metal-oxide-semiconductor internal resistance is little, pressure drop is little, so its power consumption is little.
The foregoing is only preferred embodiment of the present invention,, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (5)
1. circuit for preventing reverse connection of power supply, it is characterized in that, described circuit for preventing reverse connection of power supply comprises a switching device and a voltage bias module, the output termination power cathode of described switching device, the input of described switching device connects the positive source electrode of LED lamp circuit by the voltage bias module, the negative source electrode of the control termination LED lamp circuit of described switching device;
Described switching device adopts the first metal-oxide-semiconductor, and the drain electrode of described the first metal-oxide-semiconductor connects power cathode, and the source electrode of described the first metal-oxide-semiconductor connects the positive source electrode of LED lamp circuit by the voltage bias module, and the grid of described the first metal-oxide-semiconductor connects the negative source electrode of LED lamp circuit;
Described voltage bias module comprises the second metal-oxide-semiconductor and diode, the source electrode of described the second metal-oxide-semiconductor connects the source electrode of described the first metal-oxide-semiconductor, the grounded drain of described the second metal-oxide-semiconductor, the grid of described the second metal-oxide-semiconductor connects the negative electrode of diode, and the anode of described diode connects the positive source electrode of LED lamp circuit.
2. circuit for preventing reverse connection of power supply as claimed in claim 1, is characterized in that, described circuit for preventing reverse connection of power supply also comprises the resistance between the negative source electrode of the grid that is connected to described the first metal-oxide-semiconductor and LED lamp circuit.
3. LED lamp circuit, it is characterized in that, described LED lamp circuit comprises circuit for preventing reverse connection of power supply, described circuit for preventing reverse connection of power supply comprises a switching device and a voltage bias module, the output termination power cathode of described switching device, the input of described switching device connects the positive source electrode of LED lamp circuit by the voltage bias module, the negative source electrode of the control termination LED lamp circuit of described switching device;
Described switching device adopts the first metal-oxide-semiconductor, and the drain electrode of described the first metal-oxide-semiconductor connects power cathode, and the source electrode of described the first metal-oxide-semiconductor connects the positive source electrode of LED lamp circuit by the voltage bias module, and the grid of described the first metal-oxide-semiconductor connects the negative source electrode of LED lamp circuit;
Described voltage bias module comprises the second metal-oxide-semiconductor and diode, the source electrode of described the second metal-oxide-semiconductor connects the source electrode of described the first metal-oxide-semiconductor, the grounded drain of described the second metal-oxide-semiconductor, the grid of described the second metal-oxide-semiconductor connects the negative electrode of diode, and the anode of described diode connects the positive source electrode of LED lamp circuit.
4. LED lamp circuit as claimed in claim 3, is characterized in that, described circuit for preventing reverse connection of power supply also comprises the resistance between the negative source electrode of the grid that is connected to described the first metal-oxide-semiconductor and LED lamp circuit.
5. a LED light fixture, is characterized in that, described LED light fixture comprises LED lamp circuit as described in claim 3-4 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101403232A CN101860999B (en) | 2010-03-31 | 2010-03-31 | Circuit for preventing reverse connection of power supply, LED lamp circuit and LED lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101403232A CN101860999B (en) | 2010-03-31 | 2010-03-31 | Circuit for preventing reverse connection of power supply, LED lamp circuit and LED lamp |
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| Publication Number | Publication Date |
|---|---|
| CN101860999A CN101860999A (en) | 2010-10-13 |
| CN101860999B true CN101860999B (en) | 2013-11-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010101403232A Active CN101860999B (en) | 2010-03-31 | 2010-03-31 | Circuit for preventing reverse connection of power supply, LED lamp circuit and LED lamp |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8508898B2 (en) * | 2012-01-11 | 2013-08-13 | Robert Bosch Gmbh | Diagnosable reverse-voltage protection for high power loads |
| 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 |
| JP6190204B2 (en) * | 2012-09-25 | 2017-08-30 | エスアイアイ・セミコンダクタ株式会社 | Semiconductor device |
| CN106937435B (en) * | 2015-12-31 | 2018-10-30 | 赛尔富电子有限公司 | A kind of nonpolarity rectification circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5939863A (en) * | 1997-01-31 | 1999-08-17 | International Rectifier Corp. | Power circuit providing reverse battery protection and current and temperature sensing |
| CN2836301Y (en) * | 2005-08-28 | 2006-11-08 | 华为技术有限公司 | Reverse connection prevention circuit for power supply |
| 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 |
-
2010
- 2010-03-31 CN CN2010101403232A patent/CN101860999B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5939863A (en) * | 1997-01-31 | 1999-08-17 | International Rectifier Corp. | Power circuit providing reverse battery protection and current and temperature sensing |
| CN2836301Y (en) * | 2005-08-28 | 2006-11-08 | 华为技术有限公司 | Reverse connection prevention circuit for power supply |
| 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 |
Non-Patent Citations (1)
| Title |
|---|
| 方佩敏.功率MOSFET应用电路（五）电源极性接反保护电路.《电子制作》.2004,全文. * |
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| CN101860999A (en) | 2010-10-13 |
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