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Power source preprocessing circuit

A preprocessing circuit and power supply technology, applied in the direction of circuit devices, emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., can solve limited protection effect, large power loss, narrow application range, etc. question

Inactive Publication Date: 2010-07-07
AVIC NO 631 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In practical applications, there are many varistor (VSR) methods and TVS methods, which can only be used at light loads, and the application range is relatively narrow; the power loss is large during normal use; the protection effect is limited; the response speed is also limited.

Method used

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Embodiment Construction

[0018] The circuit provided by the present invention is based on the principle of "modularization", and adopts the method of comprehensively considering layered and step-by-step processing. A step-down two-port functional circuit component is connected in series between the input end of the power supply and the electrical equipment to form a separation wall. , presents a high-impedance state to the overvoltage surge and peak surge conducted by the power supply line, and suppresses and consumes this part of high-risk energy. In the normal power supply state, it presents a low-impedance state, with small power loss and maximum loss All controlled within 2%. The clamping circuit includes a fuse, a spike suppressor, an auxiliary power supply, a control circuit, a protection circuit, and an isolation diode.

[0019] Such as image 3 As shown, the clamping circuit is mainly aimed at the problem of overvoltage surge and peak surge. The maximum surge voltage of peak surge is 600V and...

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PUM

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Abstract

The invention provides a power source preprocessing circuit. The circuit comprises a peak suppressing circuit, a protective circuit, a buffer circuit and a control circuit; the peak suppressing circuit is connected on a power supply bus in parallel; the protective circuit and the buffer circuit are connected in series on the power supply bus; and the control circuit controls the state of the protective circuit by sampling the bus. The invention is designed to solve the technical problems that existing voltage sensitive resistor VSR method and TVS method can only be used in underloading, the application range is narrow, power loss is large in normal use, protective effect is limited, etc. The invention has the advantages of stable work, high safety, and good heat dissipation and reliability.

Description

technical field [0001] The invention relates to a power supply preprocessing circuit. Background technique [0002] With the continuous progress and development of airborne electronic equipment, "electrical pollution" such as overvoltage surges and transient peak surges has become an important problem that seriously affects the use and damage of electrical equipment. Aeronautical hardened computers require the development of power supplies that meet relevant requirements, and at the same time have flexible configurations to meet the requirements of safety, heat dissipation, reliability, and electromagnetic compatibility. In an airborne equipment computer, the main function of the power module is to realize power conversion, and convert the primary power supply voltage on the machine into various DC voltages required by the computer. Due to the complex power supply of this type of aircraft, there are a series of problems such as conduction noise, magnetic field radiation int...

Claims

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Application Information

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IPC IPC(8): H02H7/22H02H9/04
Inventor 王勃霍跃庆高栋
Owner AVIC NO 631 RES INST