Power protection circuit preventing controlled silicon effect

A power protection and circuit technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of difficulty in preventing thyristor latch-up effect, small filter resistance, etc., and achieve the effect of suppressing power-on surge current and simple circuit structure

Active Publication Date: 2010-02-17
BEIJING INST OF CONTROL ENG
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  • Summary
  • Abstract
  • Description
  • Claims
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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

Method used

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  • Power protection circuit preventing controlled silicon effect
  • Power protection circuit preventing controlled silicon effect

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Embodiment 1

[0018] The applicable voltage range is 5-15V, and the resistor R0 is selected as 10 ohms. By selecting the resistance value of the resistor R6 connected in parallel with R0, the maximum output current can be adjusted from 60-500mA; the resistor R3 is selected from 430K ohms, and the resistor R2 is selected from 500-1K ohms. , the resistor R1 is 510 ohms, the capacitor C1 is 0.47μF, and the capacitor C1 can be a resistance-capacitance series circuit to adjust the time for the power supply to return to normal power supply after the SCR effect occurs. When a short-circuit fault occurs in the load, transistor Q2 and transistor Q1 are cut off instantaneously, and the base voltage of transistor Q2 is (Vin×10) / (430+10), in which resistor R5 is selected as 10kΩ, and the base voltage of transistor Q2 is less than 0.6 V, so the transistor Q1 cannot be turned on, and the current supplied to the short-circuit load is the leakage current of the transistor Q1 and the very small current suppl...

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PUM

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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...

Claims

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Application Information

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IPC IPC(8): H02H7/10
Inventor 张笃周袁利曹荣向陈德祥蒋庆华张万利朱琦
Owner BEIJING INST OF CONTROL ENG
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