Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Amplitude control
Reexamination Certificate
2007-01-24
2010-11-09
Wells, Kenneth B. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Amplitude control
C327S312000, C327S319000, C327S324000
Reexamination Certificate
active
07830196
ABSTRACT:
When an insulated gate bipolar transistor turned on starts to transition to turn off, the insulated gate bipolar transistor has between the emitter and the collector a surge voltage caused in proportion to the magnitude of a current gradient provided when a current flowing through a coil in switching is interrupted and an electrode interconnect inductance internal to an inverter circuit. A MOS transistor is temporarily turned on within a period of time for which the insulated gate bipolar transistor turned on transitions to turn off. This can bypass a portion of the current to the MOS transistor. This can provide an alleviated apparent current gradient of the current and thus alleviate or prevent a surge voltage caused at the insulated gate bipolar transistor.
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Mitsubishi Electric Corporation
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Wells Kenneth B.
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