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High-voltage side single-end anti-reverse-connection circuit

A technology of anti-reverse connection circuit and high-voltage side, which is applied to emergency protection circuit devices, electrical components, etc., and can solve problems such as high heat loss and large voltage drop of anti-reverse connection circuit

Pending Publication Date: 2021-11-30
CHINA KEY SYST & INTEGRATED CIRCUIT
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] The purpose of the present invention is to provide a single-ended anti-reverse connection circuit on the high-voltage side to solve the problems of large voltage drop and high heat loss in traditional anti-reverse connection circuits

Method used

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  • High-voltage side single-end anti-reverse-connection circuit

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Embodiment 1

[0019] The invention provides a single-end anti-reverse connection circuit on the high-voltage side, including an anti-reverse connection back-to-back PMOS circuit, a PMOS power-on control circuit and a power-on drive protection circuit; the anti-reverse connection back-to-back PMOS circuit is used to isolate the high-voltage side single-end The input terminal and the output terminal of the anti-reverse connection circuit; the PMOS power-on control circuit controls the conduction and shutdown of the anti-reverse connection back-to-back PMOS circuit; the power-on drive protection circuit protects the PMOS power-on control circuit The NMOS tube is used to prevent damage to the NMOS tube caused by excessive voltage at the input terminal.

[0020] The specific structure of the high-voltage side single-ended anti-reverse connection circuit is as follows: figure 1 As shown, the anti-reverse connection back-to-back PMOS circuit includes a PMOS transistor Q1 and a PMOS transistor Q2, ...

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Abstract

The invention discloses a high-voltage side single-end anti-reverse-connection circuit, which belongs to the field of circuit protection and comprises an anti-reverse-connection back-to-back PMOS circuit, a PMOS power-on control circuit and a power-on driving protection circuit, wherein the anti-reverse-connection back-to-back PMOS circuit is used for isolating the input end and the output end of the high-voltage side single-end anti-reverse-connection circuit; the PMOS power-on control circuit is used for controlling the on and off of the anti-reverse-connection back-to-back PMOS circuit; the power-on driving protection circuit protects an NMOS tube in the PMOS power-on control circuit and prevents the NMOS tube from being damaged due to too high input end voltage. Compared with a traditional diode anti-reverse-connection circuit, the anti-reverse-connection circuit disclosed in the invention has the advantages that the conduction power consumption is low, extra heat dissipation measures are not needed especially under the large-current condition, and the stability and the safety of the circuit are improved.

Description

technical field [0001] The invention relates to the technical field of circuit protection, in particular to a high-voltage side single-end anti-reverse connection circuit. Background technique [0002] In traditional circuits, in order to prevent damage to the circuit when the DC input is accidentally reversed, it is usually necessary to connect a power diode in series at the input end. Due to the large size of the power diode and the large conduction voltage drop, the power loss in the circuit It is more serious; especially in the application environment of low voltage and high current, the power consumption of power diode is more obvious, which will not only reduce the efficiency of the whole system, but also generate a lot of heat, which requires a large area radiator for heat dissipation, so The conventional anti-reverse connection circuit has been difficult to meet the needs of users. Contents of the invention [0003] The purpose of the present invention is to provi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H11/00
CPCH02H11/003
Inventor 王金刚孟祥冬王传宇
Owner CHINA KEY SYST & INTEGRATED CIRCUIT
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