Composite broadband filter circuit with anti-surge voltage

A filtering circuit and anti-surge technology, which is applied to emergency protection circuit devices, circuit devices, emergency protection circuit devices, etc. for limiting overcurrent/overvoltage, and can solve the problem of difficult suppression of high-frequency components and high-frequency component suppression effects Poor, power supply circuit damage and other problems, to achieve the effect of low cost, easy productization, and fast response

Active Publication Date: 2019-03-29
BEIJING RES INST OF PRECISE MECHATRONICS CONTROLS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Surge voltage is a voltage that greatly exceeds the normal voltage in a short period of time, which will cause damage to the power supply circuit
The use of varistors and transient suppression diodes can help suppress surges, but this method is difficult to suppress high-frequency components in surges, and the existing distributed inductance and distributed capacitance have poor suppression of high-frequency components

Method used

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  • Composite broadband filter circuit with anti-surge voltage

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Embodiment Construction

[0025] Such as figure 1 As shown, a composite broadband filter circuit with anti-surge voltage, this circuit includes a piezoresistor circuit 101 arranged in parallel, a primary LC filter circuit 102, a secondary LC filter circuit 103, and a tertiary LC filter circuit 104.

[0026] The piezoresistor circuit 101 is mainly composed of piezoresistor R1, which is a semiconductor non-linear resistor. When the voltage acting on both ends is higher than the piezoresistive voltage, the resistance is turned on and presents a low resistance value. The varistors are arranged at both ends of the power supply, and are selected according to the surge voltage value that needs to be suppressed. When the voltage is output normally, the varistor presents a high-resistance state. When the surge voltage value is higher than the varistor voltage threshold, the resistance value of the varistor decreases and presents a low-resistance state, eliminating the surge peak voltage. When the voltage acros...

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PUM

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Abstract

The invention relates to a composite broadband filter circuit with an anti-surge voltage. The circuit comprises a piezoresistor circuit, a first-stage LC filter circuit, a second-stage LC filter circuit and a three-stage LC filter circuit. The piezoresistor circuit enables a low-frequency interference signal to be controlled in an allowable range of a device, thereby realizing suppression of a low-frequency surge and an interference signal. The first-stage LC filter circuit is formed by two transient suppression diodes and an LC circuit; and the transient suppression diodes are used for realizing surge voltage suppression so as to realize protection of a back-end circuit and improve the anti-electromagnetic interference capability of the application product. The second-stage LC filter circuit and the three-stage LC filter circuit are used for improving the filter effect further. According to the invention, the filtering function is combined with the anti-surge voltage function; and a high-low frequency filtering circuit with a composite function is formed based on three-stage filter circuits, so that the filtering effect is improved. Moreover, the composite broadband filter circuithas advantages of simple circuit, low cost, fast response time and the like.

Description

technical field [0001] The invention relates to a composite broadband filter circuit with anti-surge voltage, specifically a filter circuit for suppressing the surge voltage of a power supply to ensure voltage stability, and belongs to the field of electromechanical servo drive. Background technique [0002] Surge voltage is a voltage that greatly exceeds the normal voltage in a short period of time, which will cause damage to the power supply circuit. The use of varistors and transient suppression diodes can help suppress surges, but this method is difficult to suppress high-frequency components in surges, and the existing distributed inductance and distributed capacitance have poor suppression effects on high-frequency components. Combining the electromagnetic interference filter and the surge suppressor to form a comprehensive suppression circuit with filtering function can not only integrate the strengths of the two circuits, but also effectively make up for the shortcom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/00H02H9/04H03H7/01
CPCH02H9/005H02H9/04H03H7/0115H03H2007/0192
Inventor 张东阁王岩陈庆浩林强强焦震岳宗帅张巍
Owner BEIJING RES INST OF PRECISE MECHATRONICS CONTROLS
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