Apparatus for limiting inrush current

Details Apparatus for limiting inrush current Apparatus for limiting inrush current

1993-12-30

1995-05-30

Stephan, Steven L.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

323908, H02M 542

Patent

active

054207800

ABSTRACT:
A circuit for limiting inrush current in a DC power supply is disclosed. The inrush limiting circuit should be placed between an input AC power line and a power supply input capacitor bank. A thermistor is located between the capacitor bank and the input diode bridge to limit the initial inrush current. Once the input capacitor bank is fully charged, an insulated-gate bipolar transistor or IGBT switches the rectified line voltage to a boost power factor correction converter circuit, which utilizes an inductor and diode along with a field effect transistor to boost the input to a high DC voltage. This high DC voltage blocks the thermistor through use of a diode and keeps it cold to maintain high resistance in case of a new off/on cycle. The IGBT can be replaced with a silicon control rectifier, a triac, or a field effect transistor.

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patent: 5287263 (1994-02-01), Shilo

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