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Voltage conversion circuit

A technology of voltage conversion circuit and AC voltage, which is applied in circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, emergency protection circuit devices, etc., and can solve problems such as fire hazards and heat accumulation in voltage conversion circuits

Inactive Publication Date: 2013-12-25
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the voltage conversion circuit of the AC / DC power supply module is usually equipped with electrolytic capacitors for filtering, the electrolytic capacitors will experience abnormal short circuits after the life cycle is exceeded. Heat buildup can occur on the conversion circuit, creating a fire hazard

Method used

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  • Voltage conversion circuit

Examples

Experimental program
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Embodiment Construction

[0011] see figure 1 , the voltage conversion circuit 100 in a preferred embodiment is used to convert the AC voltage into a DC voltage, and the DC voltage is provided to the load 200 . The voltage conversion circuit 100 includes an input terminal 10, a first fuse F1, an overvoltage protection unit 11, a first electromagnetic interference suppression unit 12, a second electromagnetic interference suppression unit 13, a rectification unit 14, a second fuse F2, A filter unit 15 and an output terminal 16 . The rated current of the first fuse F1 is greater than the rated current of the second fuse F2, and the output terminal 16 is used to output the above-mentioned DC voltage.

[0012] The input terminal 10 includes a first input terminal 101 and a second input terminal 102 for receiving an external AC voltage. In this embodiment, the above-mentioned external AC voltage refers to 220V AC voltage, the first input terminal 101 is a live wire, and the second input terminal 102 is a ...

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PUM

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Abstract

A voltage conversion circuit is used to convert an alternating current voltage into a direct current voltage. The voltage conversion circuit comprises an input terminal used for receiving the alternating current voltage, a first fuse, an overvoltage protection unit, a rectification unit, a filtering unit and an output terminal used for outputting the direct current voltage. The input terminal, the first fuse, the overvoltage protection unit, the rectification unit, the filtering unit and the output terminal are successively and electrically connected. The voltage conversion circuit also comprises a second fuse. The second fuse is connected between the overvoltage protection unit and the rectification unit or between the rectification unit and the filtering unit.

Description

technical field [0001] The invention relates to a voltage conversion circuit, in particular to an AC / DC voltage conversion circuit. Background technique [0002] At present, the safety of various consumer electronic products has received more and more attention from consumers, and the safety protection function of AC / DC power supply modules has become more and more important. In the voltage conversion circuit of the AC / DC power supply module, a lightning protection component, such as a varistor (Varistor), is usually set between the live wire and the neutral wire constituting the AC voltage input end, and the AC voltage input end and the varistor A fuse with a higher rated current is connected in series between the resistors. When a transient overvoltage occurs at the AC voltage input terminal, the impedance of the varistor decreases rapidly under the action of the transient overvoltage, causing the current flowing through it to increase sharply, thereby achieving the prote...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/04H02H7/125H02H9/04H02M1/44
CPCH02H7/1252H02H9/041H02M1/32H02M1/44
Inventor 任永鑫
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD