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Alternating current power down alarm circuit capable of avoiding direct current input false alarm

A DC input, electrical alarm technology, applied in the direction of measuring current/voltage, measuring electrical variables, instruments, etc., can solve problems such as system malfunction and false alarm

Active Publication Date: 2014-07-09
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

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  • Alternating current power down alarm circuit capable of avoiding direct current input false alarm
  • Alternating current power down alarm circuit capable of avoiding direct current input false alarm
  • Alternating current power down alarm circuit capable of avoiding direct current input false alarm

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Embodiment Construction

[0029] In order to make the technical solution of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments in this application and various modes in the embodiments can be combined with each other if there is no conflict.

[0030] The first embodiment of the present invention discloses an AC power failure alarm circuit that prevents a DC input false alarm, such as image 3 As shown, including AC input voltage rectification and sampling circuit, reference voltage circuit, capacitor fast charge and slow release circuit, clamp circuit, input power failure optical coupling drive and alarm signal output circuit, the power supply PVCC and SVCC decide whether to be isolated according to the actual situation.

[0031] The following describes the realization mechanism of each circuit one by one.

[0032] The AC input voltage rectification and sampl...

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Abstract

The invention provides an alternating current power down alarm circuit capable of avoiding a direct current input false alarm. The alternating current power down alarm circuit comprises an alternating current input voltage rectification sampling circuit, a reference voltage circuit, a capacitance rapid-charging slow-discharging circuit and a power down optocoupler driving and alarm signal output circuit connected sequentially. The alternating current power down alarm circuit further comprises a clamping circuit. The power down optocoupler driving and alarm signal output circuit comprises a first optocoupler D3 and an optocoupler drive circuit. The output end of the clamping circuit is connected with the input end of the first optocoupler D3. The clamping circuit is used for preventing the first optocoupler D3 from being connected and preventing the first optocoupler D3 from outputting false alarm signals in the direct current input process. The alternating current power down alarm circuit can support that the power down false alarm signals are prevented from being output in the direct current input process.

Description

Technical field [0001] The invention relates to the field of power supplies, in particular to an AC power failure alarm circuit for preventing DC input false alarms. Background technique [0002] At present, most of the AC / DC switching power supplies require a power failure alarm or undervoltage protection function during AC input, but there is a false alarm output during DC input. As the requirements for product reliability become higher and higher, it is required that no false alarm signal is output when DC input is applied. [0003] Generally, the detection of input power failure or undervoltage basically adopts diode rectification, resistors are connected in series to divide the voltage, capacitors are separated and passed through, and the method of threshold determination, such as figure 2 Circuit diagram for general AC power failure detection. But when DC input, there is false alarm signal output (normally low level). [0004] At present, the AC power supply applied to commun...

Claims

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Application Information

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IPC IPC(8): G01R19/155
Inventor 王吉信陈攀嵇庆丰
Owner ZTE CORP