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An AC power-down alarm circuit to prevent false alarms from DC input

A technology for electric alarms and false alarms, applied in the direction of measuring current/voltage, measuring electrical variables, measuring devices, etc., can solve problems such as false alarms and system malfunctions

Active Publication Date: 2017-10-17
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Nowadays, the application of high-voltage DC power supply in communication systems is becoming more and more popular, and the above-mentioned power failure alarm circuit is only applicable to the situation of AC input, and false alarms are often issued when DC input is used, resulting in malfunction of the system

Method used

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  • An AC power-down alarm circuit to prevent false alarms from DC input
  • An AC power-down alarm circuit to prevent false alarms from DC input
  • An AC power-down alarm circuit to prevent false alarms from DC input

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Embodiment Construction

[0029] In order to make the technical solution of the present invention clearer, the present invention will be further elaborated below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the case of no conflict, the embodiments in the present application and various manners in the embodiments can be combined with each other.

[0030] Embodiment 1 of the present invention discloses an AC power-down alarm circuit for preventing DC input false alarms, such as image 3 As shown, it includes AC input voltage rectification sampling circuit, reference voltage circuit, capacitor fast charging and slow discharging circuit, clamping circuit, input power-down optocoupler drive and alarm signal output circuit. The power supply PVCC and SVCC need to be isolated according to the actual situation.

[0031] The implementation mechanism of each circuit will be described one by one below.

[0032] The AC input voltage rectification sampling circ...

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Abstract

The present invention provides an AC power-down alarm circuit for preventing DC input false alarms, including an AC input voltage rectification sampling circuit, a reference voltage circuit, a capacitor fast charge and slow discharge circuit, a power-down optocoupler drive and an alarm signal output circuit connected in sequence. Including a clamping circuit, the power-down optocoupler drive and alarm signal output circuit includes a first optocoupler D3 and an optocoupler drive circuit; the output end of the clamping circuit is connected to the input end of the first optocoupler D3, which is used to make the first optocoupler D3 input during DC input. One optocoupler D3 is not conducting, and no false alarm signal is output. When the AC power-down alarm circuit of the present invention supports DC input, there will be no power-down false alarm signal output.

Description

technical field [0001] The invention relates to the field of power supplies, in particular to an AC power-down alarm circuit for preventing false alarms from DC input. Background technique [0002] At present, most AC / DC switching power supplies require a power-down alarm or undervoltage protection function when AC input, but there is a false alarm output when DC input. As the requirements for product reliability are getting higher and higher, it is required that there should be no false alarm signal output during DC input. [0003] Usually, the detection of input power failure or undervoltage basically adopts diode rectification, resistors in series to divide voltage, capacitors to block direct current, threshold judgment method, such as figure 2 It is a circuit diagram for general AC power failure detection. But in the case of DC input, there is a false alarm signal output (normally low level). [0004] At present, for AC power supplies used in communication equipment s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/155
Inventor 王吉信陈攀嵇庆丰
Owner ZTE CORP