Patent Number: 6,166,932

Title: DC-to-AC converter with over-current protection

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.

Inventors: Otoshi; Kota (Kariya, JP)

Assignee: Kabushiki Kaisha Toyoda Jidoshokki Seisakusho

International Classification: H02H 7/122 (20060101); H02M 7/48 (20060101); H02M 003/335 (); H02M 007/68 (); H02H 007/122 ()

Expiration Date: 12/26/2017