Method and apparatus for determining the control electrode...

Details Method and apparatus for determining the control electrode... Method and apparatus for determining the control electrode...

H - Electricity

03

K

328/195, 323/9

H03K 17/732 (2006.01) H03K 17/04 (2006.01) H03K 17/0812 (2006.01)

Patent

CA 1306773

METHOD AND APPARATUS FOR DETERMINING THE CONTROL ELECTRODE TO CATHODE JUNCTION VOLTAGE OF A CONTROL TURN-OFF SEMICONDUCTOR DEVICE AND USE OF SUCH DETERMINED VOLTAGE IN THE CONTROL OF THE DEVICE Abstract of the Disclosure 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.

582158

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