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Power supply short circuit protection system and method with automatic restart and soft start functions

A technology of soft start circuit and short circuit of power supply, which is applied in the direction of emergency protection circuit device, output power conversion device, electrical components, etc., which can solve the problems of short circuit protection malfunction, large overshoot, etc., and achieve the effect of large capacitive load capacity

Active Publication Date: 2017-06-20
NO 43 INST OF CHINA ELECTRONICS TECH GRP CETC
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

In the conventional power supply short-circuit protection system with soft-start function, the soft-start circuit can effectively prevent the overshoot of the input current only when the power supply is started. When the output terminal voltage returns to the normal value, the overshoot of the input current is larger than the overshoot of the input current when the power supply is started, especially when the capacitive load of the power supply is large, it is easy to trigger the short-circuit protection system to enter the protection state again, resulting in malfunction of the short-circuit protection

Method used

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  • Power supply short circuit protection system and method with automatic restart and soft start functions

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0021] Such as figure 1 As shown, a power supply short-circuit protection system with automatic restart and soft-start functions includes a PWM controller 2 , a power supply circuit 3 , a soft-start circuit 4 , a reference voltage circuit 5 and a short-circuit protection circuit 6 . The PWM controller 2 is connected to the main power circuit 1 of the power supply. The main power circuit 1 is composed of an NMOS transistor Q0, a transformer T and a sampling resistor R0. The gate of the NMOS transistor Q0 is connected to the output terminal of the PWM controller, and the source of the NMOS transistor Q0 The sampling resistor R0 is grounded, and the drain of the NMOS transistor Q0 is connected to the power supply input voltage Vin through the primary winding of the transformer T.

[0022] The power supply circuit 3 is composed of a first zener di...

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Abstract

The invention provides a power supply short-circuit protection system and method with automatic restart and soft-start functions. The system includes a PWM controller, a power supply circuit, a soft-start circuit and a short-circuit protection circuit. The invention also provides a protection method of the power supply short-circuit protection system with automatic restart and soft start functions. The present invention realizes the automatic restart of the power supply circuit and the automatic reset of the soft start circuit through the short-circuit protection circuit, which can effectively prevent the input surge current after the short-circuit protection from triggering the short-circuit protection circuit to enter the protection state again and fail to return to normal. Effectively suppressed, it can have a larger capacitive load capacity than conventional hiccup short-circuit protection circuits with soft-start functions, and is suitable for various power systems.

Description

technical field [0001] The invention relates to the technical field of power supply short circuit protection, in particular to a power supply short circuit protection system and method with automatic restart and soft start functions. Background technique [0002] The short-circuit protection system is the core protection unit in the power system. Its function is to detect the short-circuit protection status in the power system and control the power supply to prevent damage to the power system caused by excessive current during short-circuit. In the conventional power supply short-circuit protection system with soft-start function, the soft-start circuit can effectively prevent the overshoot of the input current only when the power supply is started. When the output terminal voltage returns to the normal value, the overshoot of the input current is larger than the overshoot of the input current when the power supply is started, especially when the capacitive load of the power...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/10H02M1/36H02M1/32
Inventor 胡海斌胡进张石磊刘猛
Owner NO 43 INST OF CHINA ELECTRONICS TECH GRP CETC
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