DC-to-AC converter with over-current protection

Details DC-to-AC converter with over-current protection DC-to-AC converter with over-current protection

1999-07-20

2000-12-26

Wong, Peter S.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 25, 363 98, H02M 3335, H02M 768, H02H 7122

Patent

active

061669326

ABSTRACT:
A DC-to-AC converting circuit generates an alternating current by alternately switching a set of switching elements. The alternating current is supplied to a load Lo via an output filtering circuit. If a current detection resistor R1 in the DC-to-AC converting circuit detects an output current that exceeds a reference voltage Vref corresponding to an over-current set value, certain switching elements are turned off to disconnect the DC-to-AC converting circuit from the power source. However, the DC-to-AC converting circuit continues to generate an alternating current from energy stored in one or more inductors that are coupled to the DC-to-AC converting circuit. Preferably, a closing circuit is formed from a diode, a switching element, the load Lo and the inductors. Thus, even if the DC-to-AC converting circuit is disconnected from its power source, an alternating current continuously flows to the load Lo.

REFERENCES:
patent: 5113337 (1992-05-01), Steigerwald
patent: 5243509 (1993-09-01), Laeuffer
patent: 5274540 (1993-12-01), Machara
patent: 5285372 (1994-02-01), Huynh et al.
patent: 5625539 (1997-04-01), Nakata et al.
patent: 5774351 (1998-06-01), Hsieh et al.
patent: 5875107 (1999-02-01), Nagai et al.

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