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Undervoltage protection method and protector

A technology for under-voltage protection and power supply device, which is applied in the protection of under-voltage or no-voltage, etc., and can solve the problems of inability to provide input circuit fault detection and indistinguishability.

Inactive Publication Date: 2004-07-21
MITAC INT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional undervoltage protection function cannot distinguish when it is a short-term undervoltage caused by normal shutdown or voltage instability of the AC power supply, and when the circuit connected to the input terminal is faulty or short-circuited. Therefore, including the AC power supply The voltage instability or normal shutdown may activate the under-voltage protection function. This kind of under-voltage protection method not only cannot provide fault detection for the input circuit, but also causes the user to wait for the under-voltage protection function to be automatically released, or manually After the under-voltage protection function is released, the computer can be restarted and many other inconveniences

Method used

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Embodiment Construction

[0015] Relevant detailed content and technology of the present invention, cooperate accompanying drawing to illustrate as follows:

[0016] For the first embodiment of the undervoltage protection method disclosed in the present invention, please refer to " figure 1 " Shown. Mainly through the " figure 2 "Disclosed a main power supply unit 20, a standby power supply unit 30, and a voltage detection unit 40 and other functional blocks are realized. At first, an AC input power supply AC (step 101) is obtained by an AC power supply network 10; through the main power supply The unit 20 converts the AC input power supply AC into a DC output power supply DC (step 102); stores the AC input power supply AC as a backup power supply SP (step 103) through the backup power supply unit 30; detects the AC input power supply AC through the voltage detection unit 40 voltage (step 104); when the voltage of the AC input power supply AC is lower than a set voltage value, the main power supply u...

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Abstract

The undervoltage protection method and protector is used in the input of power supply unit and has one voltage detecting unit to detect the AC input voltage. When the AC input voltage is lower than some set value, the protector turns off the main power supply unit and the back-up power supply unit to prevent the abnormal overvoltage in the output end of the power supply unit. After the power supply unit enters into blocking state, one reset unit resets the undervoltage protection function of the output end to eliminate the inconvenience caused by restore of the AC input power source within short period while the power supply unit still in its blocking state.

Description

technical field [0001] The invention relates to an undervoltage protection method and device, in particular to an input terminal applied to a power supply device to prevent overcurrent phenomenon that may occur when the voltage at the input terminal is lower than a set value, and to prevent the power supply device from being over-current due to input A short-term power failure occurs at the terminal and enters the latch mode. Background technique [0002] Generally, the electrical appliances we use use alternating current (AC) power supply, the frequency is fixed at 60 Hz, and the rated voltage is 110 volts, which is an effective (RMS) value; however, for most electronic devices, it must be in It can be operated under direct current (DC) power supply, and the voltage required by different electronic devices may be different. Therefore, it is common practice to use a transformer and a rectifier circuit to convert the 110 volts, 60 Hz AC power supply into the required DC power...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/24
Inventor 刘国基
Owner MITAC INT CORP
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