Power protection circuit preventing controlled silicon effect

Abstract

The invention relates to a power protection circuit preventing controlled silicon effect, used for a power input end of a circuit and based on a constant flow source. By using the feedback principle and the principle that the voltages at both ends of a capacitor can not jump and adding a momentary cutoff function, when the circuit produces the controlled silicon latch-up effect, the power protection circuit can momentarily cut off the power supply source of a circuit board so as to destroy the maintenance current condition required by the controlled silicon and thoroughly eliminate the controlled silicon effect, which can effectively suppress the start-up surge current. When the controlled silicon effect is eliminated, the power protection circuit can quickly recover the normal power supply to the circuit board. The method provides effective protective measures for the load short circuit at the same time. When the load short circuit happens, an extremely low current is provided. The circuit has the advantages of simple structure and easy implementation.

Description

technical field [0001] The invention relates to a power supply protection circuit, in particular to a power supply protection circuit for preventing thyristor effect. Background technique [0002] At present, the power input terminal of the circuit board is generally connected with a filter circuit, and its filter resistance is relatively small, so it is difficult to prevent the SCR latch-up effect; there are currently some current detection chips, when the power supply current exceeds the set value, a signal, but this chip is not designed to eliminate SCR latch-up. Among them, "Electronic Design Technology", Volume 12, No. 10, 2005, disclosed "power circuit breaker to prevent ESD from causing device latch-up". When the device is triggered by ESD, the parasitic transistor that constitutes part of the CMOS device will behave as a controllable Silicon rectifiers, once ESD is triggered, silicon controlled rectifiers create a low-resistance path between the two parts of the CMO...

AI Technical Summary

Problems solved by technology

[0002] At present, the power input terminal of the circuit board is generally connected with a filter circuit, and its filter resistance is relatively small, so it is difficult to prevent the SCR latch-up effect; currently there are some current detection chips, when the power supply current exceeds the set value, a signal, but this chip is not designed to eliminate SCR latch-up

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