Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1998-09-11
1999-07-27
Wong, Peter S.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 98, 363 40, H02M 3335, H02M 324
Patent
active
059301228
ABSTRACT:
An inverter includes a series circuit of two current conducting units connected between two input terminals adapted to be connected to a DC power supply. Two first capacitors are connected in series between the two input terminals. A primary winding of a transformer is connected between the junction of the current conducting units and the junction of the first capacitors. Each of the current conducting units includes a parallel circuit of an IGBT, a diode and a second capacitor. The IGBT has a collector, an emitter and a gate and is rendered conductive when a control signal is applied to the gate while a voltage of a predetermined polarity is applied between the collector and the emitter. The diode is connected in inverse parallel with the IGBT. An inverter control circuit applies alternately the control signals to the respective IGBTs with a predetermined quiescent period disposed between the respective control signals applied.
REFERENCES:
Moriguchi et al; copending patent application 08/968,054 filed Nov. 12, 1997 entitled Power Supply Apparatus for Plasma Arc Utilizing Equipment.
Moriguchi et al.; copending patent application 09/159,485 filed Sep. 23, 1998 entitled "DC Power Supply Apparatus".
Shikata et al.; copending patent application 09/175,830 filed Oct. 20, 1998 entitled "DC Power Supply Apparatus".
Arai Toru
Fujiyoshi Toshikazu
Hamada Satoshi
Ishii Hideo
Moriguchi Haruo
Murray William H.
Patel Rajnikant B.
Sansha Electric Manufacturing Co., Limited
Wong Peter S.
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