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Front protection circuit for DC power supply

A technology of pre-protection and DC power supply, which is applied in the agricultural field, can solve problems such as overvoltage, harmonics and complex structure, and achieve the effects of stable inductance value, convenient use, and large interference frequency impedance

Inactive Publication Date: 2016-12-07
CHENGDU ZHIRENSHANYONG INFORMATION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of overvoltage, harmonics and complex structure in the AC power supply circuit at the front end of the DC power supply

Method used

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  • Front protection circuit for DC power supply

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Embodiment 1

[0018] figure 1 Shown: a DC power supply pre-protection circuit, including 220V AC power supply P1, 220V AC power supply P1 is connected to the signal input terminal of the overvoltage protection circuit 1, the output terminal of the overvoltage protection circuit is connected to the interference filter circuit 2, the interference filter circuit The output terminal of the circuit 2 is connected with a ballast filter circuit 3; the overvoltage protection circuit 1 includes a switch discharge tube FDG, an output terminal P2, a varistor M3, a varistor M2 and a varistor M1, and the varistor M1 One end is connected to one end of the varistor M2, the other end of the varistor M1 is connected to the current limiting resistor X3, the other end of the current limiting resistor X3 is connected to the current limiting resistor X2, and the other end of the current limiting resistor X2 is connected to one end of the varistor M3, The other end of the varistor M2 is connected to the current-...

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Abstract

The invention discloses a front protection circuit for a DC power supply. The front protection circuit is characterized by comprising a 220V AC power supply P1, wherein the 220V AC power supply P1 is connected to a signal input end of an overvoltage protection circuit (1); an output end of the overvoltage protection circuit is connected to an interference filter circuit (2); and an output end of the interference filter circuit (2) is connected to a rectifier filter circuit (3). The circuit solves the problems of overvoltage, harmonic and complicated structure in a front end AC power circuit of the DC power supply.

Description

technical field [0001] In the field of agriculture, the invention particularly relates to a DC power supply pre-protection circuit. Background technique [0002] Recently, due to the development of semiconductor and battery manufacturing technologies, etc., various devices such as mobile communication terminals, PDAs, notebook computers, and portable audio devices are used in the field of modern agriculture. Modern agricultural field equipment is in a high heat and high humidity environment, and the DC power supply used by modern agricultural field equipment is easily damaged. The reason is that there are many overvoltages and harmonic components in the AC power supply circuit at the front end of the DC power supply. Contents of the invention [0003] The purpose of the present invention is to solve the problems of overvoltage, harmonics and complex structure in the AC power supply circuit at the front end of the DC power supply. [0004] In order to achieve the above obj...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/32H02M1/12H02H9/06
CPCH02H9/06H02M1/126H02M1/32H02M1/123
Inventor 张凯胜刘华吴小莉
Owner CHENGDU ZHIRENSHANYONG INFORMATION TECH CO LTD
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