Active surge current control circuit

A technology for controlling circuits and inrush currents, applied in circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, emergency protection circuit devices, etc., can solve the problems of increasing circuit complexity, cost and power loss, etc.

Active Publication Date: 2009-08-12
上海英联电子系统有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This approach increases circuit complexity, c

Method used

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Examples

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Embodiment Construction

[0024] exist figure 1 Among them, 101 is the NTC connected in series in the loop of the input power supply, and 102 is the energy storage capacitor inside the electrical equipment. When starting up in a cold state, due to the large resistance of the NTC, the inrush current at the moment of starting up is limited. When the circuit is working, the resistance value of the NTC decreases due to self-heating, which reduces the power loss of the NTC.

[0025] exist figure 2 Among them, 201 is the NTC connected in series in the loop of the input power supply, and 202 is the energy storage capacitor inside the electrical equipment. When starting up in a cold state, due to the large resistance of the NTC, the inrush current at the moment of starting up is limited. When the terminal voltage of the energy storage capacitor reaches a predetermined value, 204 controls 203 to close, so that 201 is short-circuited. Under steady-state working conditions, 203 passes most of the load curren...

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PUM

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Abstract

The invention provides an active surge current control circuit, which consists of an electrification starting circuit, an MOSFET and a gate source voltage Vgs slope control circuit thereof, wherein a drain of the MOSFET is connected to load, and a source is connected to external input; the starting circuit consists of resistors and a Zener diodes series circuit, is spanned at two ends of the input, and sets the minimum input voltage in the working of the whole circuit and the maximum working voltage in the working of the Vgs slope control circuit; the Vgs slope control circuit consists of a resistor, a capacitor spanned between a triode c and a triode b, a diode which is reversely spanned between a triode e and the triode b, and an MOSFET protective resistor between the triode e and the triode c, controls Vgs climbing speed of the MOSFET after a power supply starts supplying power, is combined with the miller effect of Cgd in the MOSFET, and finally controls current amplitude for charging the capacitor of the load input end through the MOSFET so as to ensure that uncontrollable surge current with large amplitude in the electrifying moment can be prevented; the capacitor between the triode c and the triode b in non-electrifying period discharges through the diodes and the triode c and the triode b; and when the spanning of the slope control circuit works normally, the Vgs slope control circuit ensures that the MOSFET is completely conducted and has the minimum power consumption.

Description

Technical field: [0001] This patent relates to the control of the surge current generated during the process of taking power from a DC power bus or a remote DC power supply system for electrical equipment. Background technique [0002] In the distributed power application system, the system functions are completed by a collection of multiple circuit sub-boards. All sub-boards exchange signals through the common backplane and obtain working power from the backplane DC bus. In order to ensure the reliability and availability of the system, it is required that when any sub-board in the system fails and needs to be removed, or when it needs to be replaced by maintenance, or when a sub-board with new functions is added, it can be operated online without shutting down the entire system. When a new sub-board is inserted into the system backplane to take power, the bus first charges the voltage at both ends of the energy storage capacitor at the input end of the single-board power s...

Claims

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Application Information

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IPC IPC(8): H02H9/02
Inventor 乔宗标
Owner 上海英联电子系统有限公司
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