Rush current limiting device for power circuit

Details Rush current limiting device for power circuit Rush current limiting device for power circuit

1999-06-17

2000-12-19

Wong, Peter S.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 49, 323908, H02H 7125

Patent

active

061634697

ABSTRACT:
A rush current limiting device capable of restraining increased power consumption and heat generation caused by resistance for limiting rush current, and effectively limiting rush current caused on any conditions has. A resistance for limiting rush current caused by switching of a power switch between a rectifier diode bridge and a smoothing condenser. A triode AC switch and the relay are provided in parallel with the resistance. The on-operation of a power switch is monitored by the input monitoring circuit, and an triode AC switch is turned on at the zero crossing point of input signals after the on-operation by the zero crossing circuit to short-circuit the resistance. After a delay of the relay due to sensitive time, the relay is turned on by a relay driving circuit, and the triode AC switch is turned on.

REFERENCES:
patent: 4321447 (1982-03-01), Lamb
patent: 4555741 (1985-11-01), Masaki
patent: 4814966 (1989-03-01), Ekstrand
patent: 5187653 (1993-02-01), Lorenz
patent: 5287263 (1994-02-01), Shilo
patent: 5574632 (1996-11-01), Pansier
patent: 5619127 (1997-04-01), Warizaya
patent: 5715154 (1998-02-01), Rault

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