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 PDF

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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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led lamp
circuit
oxide
power supply
metal
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CN101860999A (en
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周明杰
王学军
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Oceans King Lighting Science and Technology Co Ltd
Shenzhen Oceans King Lighting Engineering Co Ltd
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Oceans King Lighting Science and Technology Co Ltd
Shenzhen Oceans King Lighting Engineering Co Ltd
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Abstract

本发明适用于LED灯具领域，提供了一种电源防反接电路、LED灯具电路及LED灯具，电源防反接电路包括一开关器件和一电压偏置模块。在本发明中，该电源防反接电路采用MOS管作为开关器件，当电源接反时，利用MOS管的开关特性断开LED灯具电路的电源通路，从而起到电源防反接的作用，而由于MOS管内阻小，压降小，所以其功耗小。

The invention is applicable to the field of LED lamps, and provides a power supply anti-reverse connection circuit, an LED lamp circuit and an LED lamp. The power supply anti-reverse connection circuit includes a switch device and a voltage bias module. In the present invention, the power supply anti-reverse connection circuit uses a MOS tube as a switching device. When the power supply is reversed, the switching characteristics of the MOS tube are used to disconnect the power path of the LED lamp circuit, thereby playing the role of preventing reverse connection of the power supply. Due to the small internal resistance and small voltage drop of the MOS tube, its power consumption is small.

Description

一种电源防反接电路、LED灯具电路及LED灯具Power supply anti-reverse connection circuit, LED lamp circuit and LED lamp

技术领域technical field

本发明属于LED灯具领域，尤其涉及一种电源防反接电路、LED灯具电路及LED灯具。The invention belongs to the field of LED lamps, and in particular relates to a power supply anti-reverse connection circuit, an LED lamp circuit and an LED lamp.

背景技术Background technique

在使用外接电源的电子设备中，如果电子设备的电源接反，会造成电子设备永久性的损坏。In electronic equipment using an external power supply, if the power supply of the electronic equipment is reversed, it will cause permanent damage to the electronic equipment.

现在的电源防反接电路采用二极管，利用二极管的单向导通特性达到防止电源反接损坏电子设备的目的。但是，由于二极管的压降固定，造成其消耗的功率过大，产生热量，造成电路稳定性降低。The current anti-reverse connection circuit of the power supply uses a diode, and uses the unidirectional conduction characteristic of the diode to prevent the reverse connection of the power supply from damaging the electronic equipment. However, since the voltage drop of the diode is fixed, it consumes too much power and generates heat, which reduces the stability of the circuit.

发明内容Contents of the invention

本发明实施例的目的在于提供一种电源防反接电路，旨在解决现有的电源防反接电路采用二极管存在功耗大的问题。The purpose of the embodiments of the present invention is to provide a power supply reverse connection prevention circuit, aiming at solving the problem of high power consumption caused by diodes used in the existing power supply reverse connection prevention circuit.

本发明实施例是这样实现的，一种电源防反接电路，所述电源防反接电路包括一开关器件和一电压偏置模块，所述开关器件的输出端接电源负极，所述开关器件的输入端通过电压偏置模块接LED灯具电路的正源极，所述开关器件的控制端接LED灯具电路的负源极；The embodiment of the present invention is achieved in this way, a power supply anti-reverse connection circuit, the power supply anti-reverse connection circuit includes a switch device and a voltage bias module, the output terminal of the switch device is connected to the negative pole of the power supply, and the switch device The input terminal of the switch device is connected to the positive source of the LED lamp circuit through the voltage bias module, and the control terminal of the switching device is connected to the negative source of the LED lamp circuit;

所述开关器件采用第一MOS管，所述第一MOS管的漏极接电源负极，所述第一MOS管的源极通过电压偏置模块接LED灯具电路的正源极，所述第一MOS管的栅极接LED灯具电路的负源极；The switching device adopts a first MOS tube, the drain of the first MOS tube is connected to the negative pole of the power supply, the source of the first MOS tube is connected to the positive source of the LED lamp circuit through a voltage bias module, and the first The gate of the MOS tube is connected to the negative source of the LED lamp circuit;

所述电压偏置模块包括第二MOS管和二极管，所述第二MOS管的源极接所述第一MOS管的源极，所述第二MOS管的漏极接地，所述第二MOS管的栅极接二极管的阴极，所述二极管的阳极接LED灯具电路的正源极。The voltage bias module includes a second MOS transistor and a diode, the source of the second MOS transistor is connected to the source of the first MOS transistor, the drain of the second MOS transistor is grounded, and the second MOS transistor The grid of the tube is connected to the cathode of the diode, and the anode of the diode is connected to the positive source of the LED lamp circuit.

本发明实施例的另一目的在于提供一种LED灯具电路，所述LED灯具电路包括电源防反接电路，所述电源防反接电路包括一开关器件和一电压偏置模块，所述开关器件的输出端接电源负极，所述开关器件的输入端通过电压偏置模块接LED灯具电路的正源极，所述开关器件的控制端接LED灯具电路的负源极；Another object of the embodiments of the present invention is to provide an LED lamp circuit, the LED lamp circuit includes a power supply anti-reverse connection circuit, the power supply anti-reverse connection circuit includes a switching device and a voltage bias module, the switching device The output terminal of the switching device is connected to the negative pole of the power supply, the input terminal of the switching device is connected to the positive source of the LED lamp circuit through the voltage bias module, and the control terminal of the switching device is connected to the negative source of the LED lamp circuit;

所述开关器件采用第一MOS管，所述第一MOS管的漏极接电源负极，所述第一MOS管的源极通过电压偏置模块接LED灯具电路的正源极，所述第一MOS管的栅极接LED灯具电路的负源极；The switching device adopts a first MOS tube, the drain of the first MOS tube is connected to the negative pole of the power supply, the source of the first MOS tube is connected to the positive source of the LED lamp circuit through a voltage bias module, and the first The gate of the MOS tube is connected to the negative source of the LED lamp circuit;

所述电压偏置模块包括第二MOS管和二极管，所述第二MOS管的源极接所述第一MOS管的源极，所述第二MOS管的漏极接地，所述第二MOS管的栅极接二极管的阴极，所述二极管的阳极接LED灯具电路的正源极。The voltage bias module includes a second MOS transistor and a diode, the source of the second MOS transistor is connected to the source of the first MOS transistor, the drain of the second MOS transistor is grounded, and the second MOS transistor The grid of the tube is connected to the cathode of the diode, and the anode of the diode is connected to the positive source of the LED lamp circuit.

本发明实施例的另一目的在于提供一种包括上述LED灯具电路的LED灯具。Another object of the embodiments of the present invention is to provide an LED lamp comprising the above-mentioned LED lamp circuit.

在本发明实施例中，该电源防反接电路采用MOS管作为开关器件，当电源接反时，利用MOS管的开关特性断开LED灯具电路的电源通路，从而起到电源防反接的作用，而由于MOS管内阻小，压降小，所以其功耗小。In the embodiment of the present invention, the power supply anti-reverse connection circuit uses a MOS tube as a switching device. When the power supply is reversed, the switching characteristics of the MOS tube are used to disconnect the power path of the LED lamp circuit, thereby playing the role of preventing reverse connection of the power supply. , and due to the small internal resistance and small voltage drop of the MOS tube, its power consumption is small.

附图说明Description of drawings

图1是本发明实施例提供的电源防反接电路的结构图；Fig. 1 is a structural diagram of a power supply anti-reverse connection circuit provided by an embodiment of the present invention;

图2是本发明实施例提供的电源防反接电路的示例电路图。Fig. 2 is an example circuit diagram of a power supply reverse connection prevention circuit provided by an embodiment of the present invention.

具体实施方式Detailed ways

为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

本发明实施例中，该电源防反接电路采用MOS管作为开关器件，当电源接反时，利用MOS管的开关特性断开LED灯具电路的电源通路，从而起到电源防反接的作用，而由于MOS管内阻小，压降小，所以其功耗小。In the embodiment of the present invention, the power supply anti-reverse connection circuit uses a MOS tube as a switching device. When the power supply is reversed, the switching characteristics of the MOS tube are used to disconnect the power path of the LED lamp circuit, thereby playing the role of preventing reverse connection of the power supply. And because the internal resistance of the MOS tube is small, the voltage drop is small, so its power consumption is small.

图1示出了本发明实施例提供的电源防反接电路的结构，为了便于说明，仅示出了与本发明实施例相关的部分。Fig. 1 shows the structure of a power supply anti-reverse connection circuit provided by an embodiment of the present invention. For convenience of description, only the parts related to the embodiment of the present invention are shown.

电源防反接电路包括一开关器件100和一电压偏置模块200，开关器件100的输出端接电源负极，开关器件100的输入端通过电压偏置模块200接LED灯具电路的正源极，开关器件100的控制端接LED灯具电路的负源极。The power supply anti-reverse connection circuit includes a switching device 100 and a voltage bias module 200, the output terminal of the switching device 100 is connected to the negative pole of the power supply, the input terminal of the switching device 100 is connected to the positive source of the LED lamp circuit through the voltage bias module 200, and the switch The control terminal of the device 100 is connected to the negative source of the LED lamp circuit.

图2示出了本发明实施例提供的电源防反接电路的示例电路结构，为了便于说明，仅示出了与本发明实施例相关的部分。Fig. 2 shows an example circuit structure of a power supply anti-reverse connection circuit provided by an embodiment of the present invention. For convenience of description, only the parts related to the embodiment of the present invention are shown.

作为本发明一实施例，开关器件100采用第一MOS管Q1，第一MOS管Q1的漏极接电源负极，第一MOS管Q1的源极通过电压偏置模块200接LED灯具电路的正源极，第一MOS管Q1的栅极接LED灯具电路的负源极。As an embodiment of the present invention, the switching device 100 adopts the first MOS transistor Q1, the drain of the first MOS transistor Q1 is connected to the negative pole of the power supply, and the source of the first MOS transistor Q1 is connected to the positive source of the LED lamp circuit through the voltage bias module 200 pole, and the gate of the first MOS transistor Q1 is connected to the negative source of the LED lamp circuit.

作为本发明一实施例，电压偏置模块200包括第二MOS管Q2和二极管D1，第二MOS管Q2的源极接第一MOS管Q1的源极，第二MOS管Q2的漏极接地，第二MOS管Q2的栅极接二极管D1的阴极，二极管D1的阳极接LED灯具电路的正源极。As an embodiment of the present invention, the voltage bias module 200 includes a second MOS transistor Q2 and a diode D1, the source of the second MOS transistor Q2 is connected to the source of the first MOS transistor Q1, and the drain of the second MOS transistor Q2 is grounded. The gate of the second MOS transistor Q2 is connected to the cathode of the diode D1, and the anode of the diode D1 is connected to the positive source of the LED lamp circuit.

作为本发明一实施例，电源防反接电路还包括连接在第一MOS管Q1的栅极和LED灯具电路的负源极之间的电阻R1。As an embodiment of the present invention, the power supply anti-reverse connection circuit further includes a resistor R1 connected between the gate of the first MOS transistor Q1 and the negative source of the LED lamp circuit.

本发明实施例还提供一种包括上述电源防反接电路的LED灯具电路。An embodiment of the present invention also provides an LED lamp circuit including the above power supply reverse connection prevention circuit.

本发明实施例还提供一种包括上述LED灯具电路的LED灯具。An embodiment of the present invention also provides an LED lamp comprising the above-mentioned LED lamp circuit.

该电源防反接电路的工作原理为：The working principle of the power supply anti-reverse connection circuit is:

当电源正常接入时，电压偏置模块200为第一MOS管Q1的栅极和源极之间提供正向偏置电压，第一MOS管Q1导通，第一MOS管Q1的漏极和源极之间有电流通过，LED灯具电路的电源通路导通，LED灯具正常工作；When the power supply is normally connected, the voltage bias module 200 provides a forward bias voltage between the gate and the source of the first MOS transistor Q1, the first MOS transistor Q1 is turned on, and the drain of the first MOS transistor Q1 and There is current passing between the sources, the power path of the LED lamp circuit is turned on, and the LED lamp works normally;

当电源接反时，电压偏置模块200为第一MOS管Q1的栅极和源极之间提供反向偏置电压，第一MOS管Q1不导通，第一MOS管Q1的漏极和源极之间没有电流通过，LED灯具电路的电源通路断开，防止LED灯具被损坏。When the power supply is reversed, the voltage bias module 200 provides a reverse bias voltage between the gate and source of the first MOS transistor Q1, the first MOS transistor Q1 is not turned on, the drain of the first MOS transistor Q1 and the There is no current passing between the sources, and the power path of the LED lamp circuit is disconnected to prevent the LED lamp from being damaged.

在本发明实施例中，该电源防反接电路采用MOS管作为开关器件，当电源接反时，利用MOS管的开关特性断开LED灯具电路的电源通路，从而起到电源防反接的作用，而由于MOS管内阻小，压降小，所以其功耗小。In the embodiment of the present invention, the power supply anti-reverse connection circuit uses a MOS tube as a switching device. When the power supply is reversed, the switching characteristics of the MOS tube are used to disconnect the power path of the LED lamp circuit, thereby playing the role of preventing reverse connection of the power supply. , and due to the small internal resistance and small voltage drop of the MOS tube, its power consumption is small.

以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

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.
CN2010101403232A 2010-03-31 2010-03-31 Circuit for preventing reverse connection of power supply, LED lamp circuit and LED lamp Expired - Fee Related CN101860999B (en)

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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

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