Electric power conversion systems – Current conversion – Including automatic or integral protection means
Patent
1989-08-03
1990-05-15
Wong, Peter S.
Electric power conversion systems
Current conversion
Including automatic or integral protection means
363137, H02H 7122
Patent
active
049263064
ABSTRACT:
A power converter comprising: a three phase bridge circuit, each phase of which is composed of series-connected positive and negative arms, each of which arms includes series-connected GTOs; free-wheel diodes coupled in reverse parallel with every GTO; phase snubber circuits provided for every phase, each of which includes series-connected diodes coupled across the series-connected arms through a first capacitor, a junction of the diodes being coupled to a junction of the series-connected arms through a second capacitor and a junction of the first capacitor and the series-connected diodes being coupled to a negative dc terminal through a resistor; and individual snubber circuits provided in the respective GTOs, each of which includes a series connection of a diode and a third capacitor as well as a resistor connected in parallel with the diode; in which the first capacitor has capacitance much larger than the second capacitor, which in turn has capacitance much larger than the third capacitor.
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Salzmann et al., "Progress in Voltage Source Inverters (VSIs) and Current Source Inverters (CSIs) with Modern Semiconductor Device", IEEE, IAS, Conference Record of Annual Meeting (1987) pp. 577 to 583.
Heumann et al., "Switching Losses and Operational Frequency Limitations of GTO Thyristors in PWM Inverters", PESC '88 Record (Apr. 1988), pp. 921-927.
Hombu Mitsuyuki
Honda Kazuo
Morinaga Daisaku
Ueda Shigeta
Hitachi , Ltd.
Wong Peter S.
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