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Suppressing circuit of power-on impact current

A technology for suppressing circuit and electric shock, applied in emergency protection circuit devices, circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., can solve the problems of power-on inrush current, etc. inhibiting effect

Inactive Publication Date: 2009-09-16
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the problem that a power-on surge current may appear in a circuit with a large input capacitance in the current loop at the moment of power-on, thereby providing a circuit for suppressing the power-on surge current

Method used

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  • Suppressing circuit of power-on impact current
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  • Suppressing circuit of power-on impact current

Examples

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specific Embodiment approach 1

[0007] Specific implementation mode one: combine figure 1 Describe this specific embodiment, a suppression circuit for power-on surge current, which includes a first current-limiting resistor R1, a second current-limiting circuit 2 and a control module 4, and the second current-limiting circuit 2 includes a thyristor S1 and The second current-limiting thermistor R2, the cathode of the thyristor S1 is connected to one end of the second current-limiting thermistor R2, the second current-limiting circuit 2 is connected in parallel with the first current-limiting resistor R1, the The control signal output terminal of the control module 4 is connected with the control terminal of the thyristor S1.

[0008] The first current limiting resistor R1 of the present invention is used to realize the slow rise of the input current; the second current limiting circuit 2 is used to realize the input current suppression and smooth startup of the converter 11 during operation; the control modul...

specific Embodiment approach 2

[0009] Embodiment 2: The difference between this embodiment and the power-on inrush current suppression circuit described in Embodiment 1 is that the thyristor S1 is a one-way thyristor.

[0010] In this specific embodiment, the power supply voltage is a DC voltage.

specific Embodiment approach 3

[0011] Specific implementation mode three: combination figure 2 This specific embodiment is described. The difference between this specific embodiment and the power-on inrush current suppression circuit described in the second specific embodiment is that the control module 4 includes a thyristor drive circuit 42 and a first timer T1. The thyristor control signal output end of the thyristor drive circuit 42 is connected to the control end of the thyristor S1 , and the control signal output end of the first timer T1 is connected to the control signal input end of the thyristor drive circuit 42 . The power input end of the thyristor drive circuit 42 is connected to the anode of the thyristor S1. The suppression circuit charges the output capacitor C2 through the filter 10, and outputs it through the converter 11 after the charging is completed.

[0012] Working principle: The circuit of the present invention uses the first current-limiting resistor R1, whose function is to limi...

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Abstract

A suppressing circuit of power-on impact current relates to a circuit capable of suppressing power-on impact current effectively. The invention solves the problem that power-on impact current of a circuit with large input capacity can appear in a power-on momentary current circuit. The cathode of a controlled silicon S1 of the suppressing circuit of power-on impact current is connected with one end of a second current-limiting thermal resistor R2, a second current-limiting circuit is connected with a first current-limiting resistance R1 in parallel, and a control signal output end of a control module is connected with a control end of the controlled silicon. The invention can be widely sued in switching power supply.

Description

technical field [0001] The invention relates to a circuit capable of effectively suppressing power-on surge current. Background technique [0002] Circuit modules with large input capacitors, such as X capacitors and Y capacitors in the electromagnetic compatibility link in switching power supplies, electrolytic capacitors in the rectification and filtering links, or output electrolytic capacitors in the power factor correction link. At the moment of power-on, because these capacitors require a large charging current, a very large inrush current will also be generated in the current flowing through the circuit. In severe cases, it will cause malfunction of devices in the power grid or require multiple power-on. In addition, the large inrush current will also pollute the power grid and affect or damage other equipment in the power grid. The suppression effect of the existing power-on surge current suppression circuit is not good. Contents of the invention [0003] The in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/02
Inventor 张相军马岭王兴国王议锋徐殿国杨潮晖
Owner HARBIN INST OF TECH
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