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Electronic component power-off protection circuit

A technology for electronic components and power-off protection, applied in emergency protection circuit devices, electrical components, electrical digital data processing, etc., can solve the problems of reducing the service life of memory and Northbridge chips, data disappearance, etc., and achieves easy implementation and simple circuit configuration , the effect of avoiding damage

Inactive Publication Date: 2008-11-26
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the north bridge chip and memory receiving the working voltage are not yet ready to start, the working voltage input in advance will impact the memory, causing the data stored in it to disappear, and even reduce the service life of the memory and north bridge chip in severe cases.

Method used

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  • Electronic component power-off protection circuit
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Embodiment Construction

[0011] see figure 2 ,for figure 1 The protection circuit added to the front end of the circuit. The circuit mainly includes several power terminals, a control signal input terminal b, a signal output terminal c, and four transistors Q1, Q2, Q3, Q4. Wherein, the control signal S3 sent by the south bridge chip is input from the base of the transistor Q1 through the resistor R1, the emitter of the transistor Q1 is grounded, and the collector of the transistor Q1 is connected to the 3.3 volt power supply through the resistor R2. Transistor Q2 has its base connected to the collector of transistor Q1, its emitter connected to ground, and its collector connected to the 3.3 volt supply through resistor R3. The collector of the transistor Q3 is connected to the collector of the transistor Q2 and then connected to the base of the transistor Q4, the emitter of which is grounded, and a PWRGD signal is input to the base through the resistor R4. The emitter of the transistor Q4 is groun...

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Abstract

An electronic component power-off protection circuit is connected with input end of one electronic component power supply circuit, said electronic component power supply circuit receiving one first control signal generating operating voltage of said electronic component. Said electronic component power-off protection circuit includes one first transistor having grounded emitter, its collector receiving high potential control signal, its base inputting one power supply sense signal, and one second transistor having grounded emitter, its base connected with collector of first transistor, collector receiving said first control signal and connected with input end of said electronic component power supply circuit. Said power supply sense signal presents a high potential signal after computer starting up, and presenting a low potential signal after computer switching off, thereof capable of avoiding damage to electronic component in restarting after illegally switching off.

Description

【Technical field】 [0001] The invention relates to a power failure protection circuit for electronic components, in particular to a protection circuit capable of protecting electronic components when a computer restarts after illegal power failure. 【Background technique】 [0002] Components such as the memory (Memory), the central processing unit (CPU) and the north and south bridge chips on the computer motherboard must obtain a sufficient working voltage to work normally, and the working voltage is provided by the computer motherboard. Since the above-mentioned components have relatively large-scale integrated circuits inside, and the working voltages of the internal circuit modules are not the same, different power circuits will be set on the motherboard for different internal circuit modules to provide suitable voltage for the entire chipset. The operating voltage to maintain the normal operation of the computer. [0003] The power supply circuit of NVIDIA series motherb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/20G06F1/16
CPCG11C5/14G09G5/006G09G5/008G09G5/12G09G2370/042G09G2370/047G09G2370/12G09G2370/20G09G2370/22
Inventor 黄永兆李云
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD