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Power failure protection circuit and application thereof

A technology for power failure protection and power supply circuit, which is applied to emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, circuit devices, etc., and can solve problems such as automatic circuit restart.

Pending Publication Date: 2020-11-03
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a power failure protection circuit and its application, which solves the problem of automatic restart of the circuit after power failure

Method used

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  • Power failure protection circuit and application thereof
  • Power failure protection circuit and application thereof
  • Power failure protection circuit and application thereof

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Embodiment Construction

[0030] The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.

[0031] like figure 1 As shown, a power failure protection circuit disclosed in the present invention includes a main circuit, a power supply circuit, a detection circuit and a logic control circuit. The main circuit is a bidirectional thyristor circuit with drive; the power circuit is a half-wave rectifier circuit for converting alternating current into direct current; a switch SW1 is provided between the power supply circuit and the detection circuit, and the detection circuit includes a delay circuit and switch state detection circuit, the delay circuit is used to detect the state of the power grid, and the switch state detection circuit is used to detect the state of the switch SW1; the logic control circuit includes three and non-logic controllers, through the connection of three and non-...

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Abstract

The invention discloses a power failure protection circuit and application thereof. The power failure protection circuit comprises a main circuit, a power supply circuit, a detection circuit and a logic control circuit; the main circuit is a bidirectional silicon controlled rectifier switching circuit with an optoelectronic isolator U4; the power supply circuit is a half-wave rectification circuit; a switch SW1 is arranged between the power supply circuit and the detection circuit, the detection circuit comprises a time delay circuit and a switch state detection circuit, and state detection ofa power grid and the switch SW1 can be realized; the logic control circuit comprises NAND logic controllers U1, U2 and U3, and controls the level of an input pin 2 of the U4, thereby controlling thevoltage difference between a pin 1 and a pin 2 of the U4, thereby achieving the control of the bidirectional silicon controlled rectifier. When the working circuit is suddenly powered off during operation, the power grid and switch detection signals are abnormal, the circuit stops operating, and the switch SW1 is not switched off; and after electrification, the power grid is detected to be normal,but the switch is detected to be in a closed state, the logic control circuit does not output a trigger signal, the main circuit is started, and normal operation can be realized only by switching offand switching on the switch.

Description

technical field [0001] The invention belongs to the technical field of power electronic protection, in particular to a power failure protection circuit and its application. Background technique [0002] Common household appliances such as electric furnaces, electric lamps, electric tools, etc. use ordinary on-off switches as the main components for circuit connection and closure. When the power is turned on again after a sudden power failure, the circuit will automatically restart. Big potential safety hazard, for the lighting circuit, it will cause a waste of electric energy; therefore, it is necessary to design a new type of circuit with power failure protection function. Contents of the invention [0003] The object of the present invention is to provide a power failure protection circuit and its application, which solves the problem of automatic restart of the circuit after power failure. [0004] The present invention is achieved through the following technical solut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/04
CPCH02H9/04
Inventor 郝鹏飞罗熠文陈景文杨俊波郑乃文王依妍李晶
Owner SHAANXI UNIV OF SCI & TECH
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