Active clamp circuit with immunity to zener diode...

Details Active clamp circuit with immunity to zener diode... Active clamp circuit with immunity to zener diode...

H - Electricity

03

K

323/9

H03K 17/60 (2006.01) H03K 17/082 (2006.01) H03K 17/687 (2006.01)

Patent

CA 2033236

An active clamp circuit for an inductive load switching circuit includes a zener current control resistor to set the breakdown current in a zener diode of the clamp circuit. The zener breakdown current is set at a sufficiently high level to ensure that the zener diode is operated at a point beyond its "knee" region and therefore does not generate interfering levels of microplasmic noise (MPN). The zener current control resistor is provided in addition to a circuit speed control resistor such that there is substantially independent control of the switching circuit operating speed and the breakdown current of the zener diode of the active clamp circuit.

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