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Practical input power-down fast detecting circuit

A detection circuit, fast technology, applied in the field of communication power supply, can solve the problems of high cost, long distance of line crossing, unfavorable PCB layout design, etc., achieve the effect of simple circuit, reduce material and design cost

Pending Publication Date: 2019-01-11
BEIJING DESIGN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of detection circuit is derived from high-voltage step-down, and relies on single-chip microcomputer or comparator and optocoupler devices connected to the preliminary test level. It has high cost, long distance between lines, and is susceptible to interference, which is not conducive to PCB layout design.

Method used

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  • Practical input power-down fast detecting circuit

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Embodiment Construction

[0012] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0013] See figure 1 , A practical input power failure fast detection circuit, including transformer secondary winding module 1, voltage comparison module 2 and signal output module 3. The transformer secondary winding sampling rectifier module 1 consists of transformer secondary winding T, diode D1 and capacitor C1 In which, the pin 8 of the transformer secondary coil T is connected to the diode D1 through the circuit, the circuit interf...

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Abstract

The invention discloses a practical input power-down fast detecting circuit, which comprises a transformer secondary winding module, a voltage comparison module and a signal output module. The transformer secondary winding sampling rectifier module comprises a transformer secondary coil T, a diode D1 and a capacitor C1, wherein a pin 8 of the transformer secondary coil T is connected to the diodeD1 through a circuit; a circuit interface of the diode D1 is connected to the capacitor C1 through a circuit; and the capacitor C1 is connected to the circuit interface of a pin 7 of the transformer secondary coil T through the circuit. The input power-down fast detecting circuit of the utility can judge the input voltage accurately by directly sampling from a secondary winding of the transformerand comparing with the voltage of a reference device. The practical input power-down fast detecting circuit is simple, fast and accurate in circuits and can reduce materials and design cost of the circuits.

Description

Technical field [0001] The invention relates to the technical field of communication power supplies, in particular to a practical input power failure fast detection circuit. Background technique [0002] At present, the widely used input voltage power failure detection technology is a detection circuit where the mains is rectified on the AC side and then filtered by step-down, detected by a single-chip microcomputer or compared with an operational amplifier, and then transmitted to a secondary output signal detection circuit through an optocoupler. This detection circuit is derived from a high voltage step-down, and relies on a single-chip microcomputer or a comparator and an optical coupling device that is connected to the preliminary test level. The cost is high, the line is connected to a long distance, is easily interfered, and is not conducive to PCB layout design. Summary of the invention [0003] The purpose of the present invention is to provide a practical input power fai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/155G01R19/165
CPCG01R19/155G01R19/16538G01R19/16576
Inventor 马群
Owner BEIJING DESIGN TECH