Method and apparatus for determining the control electrode to ca

Details Method and apparatus for determining the control electrode to ca Method and apparatus for determining the control electrode to ca

1987-11-23

1988-10-04

Wong, Peter S.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 58, 363 78, 363 85, 363 96, 307633, H02H 7125

Patent

active

047759259

ABSTRACT:
An apparatus and method relative to the operating of a control turn-off semiconductor device provide for determining the actual control electrode to cathode voltage upon the application of a turn-off control signal by adjusting the apparent value of that voltage by a value representing the voltage drop due to inductance in lead lines. The thusly adjusted value is employed to develop an output signal which indicates that the device has been turned off. In a further embodiment, the output signal may also be employed to reduce the value of the control signal from a first, relatively high value to a second, relatively low value.

REFERENCES:
patent: 4600917 (1986-07-01), Seki et al.
patent: 4641231 (1987-02-01), Walker et al.
patent: 4674023 (1987-06-01), Peppel et al.
patent: 4682278 (1987-07-01), Marquardt et al.

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