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Method and device for protecting reverse connection prevention and slow start of direct-current power supply input

A DC power supply, anti-reverse connection technology, applied in the field of electronics, can solve the problems of Q2 being easily damaged, low circuit reliability, and damage to Q1.

Active Publication Date: 2013-10-09
HUAWEI DIGITAL POWER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the existing DC power input anti-reverse connection and slow start protection circuit, Q2 is easily damaged when power is turned on and off repeatedly; When Q1 is damaged, the reliability of the circuit is low

Method used

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  • Method and device for protecting reverse connection prevention and slow start of direct-current power supply input
  • Method and device for protecting reverse connection prevention and slow start of direct-current power supply input
  • Method and device for protecting reverse connection prevention and slow start of direct-current power supply input

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Embodiment 1

[0033] The embodiment of the present invention provides a DC power input anti-reverse connection and slow start protection method, such as image 3 As shown, the method includes:

[0034] 301. During the power-on process, when the input voltage of the DC power supply is higher than the second input voltage, the input voltage of the DC power supply starts to supply power to the gate of the anti-reverse MOSFET in the anti-reverse connection and slow-start circuit, and controls all The anti-reverse connection and slow start circuit begins to work.

[0035] 302. During the power-off process, when the input voltage of the DC power supply is lower than the first input voltage, the input voltage of the DC power supply stops supplying power to the gate of the anti-reverse connection MOSFET, and controls the anti-reverse connection and slow start The circuit stops working, wherein the first input voltage is lower than the second input voltage.

[0036] According to an embodiment of the prese...

Embodiment 2

[0038] The embodiment of the present invention provides a DC power input anti-reverse connection and slow start protection method, such as Figure 4 As shown, the method includes:

[0039] 401. During the power-on process, when the input voltage of the DC power supply is higher than the second input voltage, the input voltage of the DC power supply starts to supply power to the gate of the anti-reverse MOSFET in the anti-reverse connection and slow-start circuit, and controls all The anti-reverse connection and slow start circuit begins to work.

[0040] 402. When the input voltage of the DC power supply starts to supply power to the gate of the anti-reverse MOSFET, the gate voltage of the anti-reverse MOSFET is slowly controlled by the slow-start unit in the anti-reverse and slow-start circuit. Rising, prompting the anti-reverse connection MOSFET to turn on.

[0041] 403. When the gate voltage of the anti-reverse connection MOSFET rises to a second set voltage, the anti-reverse con...

Embodiment 3

[0046] The embodiment of the present invention provides a DC power input anti-reverse connection and slow start protection device, such as Figure 5 As shown, the device includes an anti-reverse connection and slow start circuit 52 and a switch controller 51;

[0047] The switch controller 51 is used to receive the input voltage of the DC power supply and is coupled to the gate of the anti-reverse MOSFET in the anti-reverse connection and slow-start circuit 52. During the power-on process, when the input voltage of the DC power supply is high At the second input voltage, start to use the input voltage of the DC power supply to supply power to the gate of the anti-reverse connection MOSFET, and control the anti-reverse connection and slow start circuit 52 to start working. During the power-off process, when the DC power supply When the input voltage of is lower than the first input voltage, stop using the input voltage of the DC power supply to supply power to the gate of the anti-...

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Abstract

The embodiment of the invention discloses a method and a device for protecting the reverse connection prevention and the slow start of direct-current power supply input. The method comprises the following steps that: in a power-on process, when an input voltage of a direct-current power supply is higher than a second input voltage, the input voltage of the direct-current power supply starts to supply power to a grid electrode of a reverse connection prevention metal-oxide-semiconductor field effect transistor (MOSFET) in a reverse connection prevention and slow start circuit and controls the reverse connection prevention and slow start circuit to start to work; and in a power-down process, when the input voltage of the direct-current power supply is lower than a first input voltage, the input voltage of the direct-current power supply stops supplying power to the grid electrode of the reverse connection prevention MOSFET and controls the reverse connection prevention and slow start circuit to stop working, wherein the first input voltage is lower than the second input voltage. The method and the device are suitable for protecting the reverse connection prevention and the slow start of the direct-current power supply input.

Description

Technical field [0001] The invention relates to the field of electronic technology, in particular to a method and device for preventing reverse connection and slow start of a DC power input. Background technique [0002] Generally, the DC power supply of electronic equipment uses electrolytic capacitors of different capacities at the input port, which will generate a large inrush current when starting up, which will affect the front-end power supply equipment, the selection of the fuse type of the input terminal of the electronic equipment, and the Reliability has caused a certain impact. In order to overcome this effect, it is necessary to equip the DC power supply of electronic equipment with input anti-reverse and slow-start protection circuits. [0003] At present, in the existing DC power input anti-reverse and slow-start protection circuit, two MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistor, metal-oxide-semiconductor-field effect transistor) Q1 and Q2 are usually...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H11/00H02M1/36
Inventor 杨文科夏维洪
Owner HUAWEI DIGITAL POWER TECH CO LTD
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