Overcurrent and over-temperature protection circuit for power semiconductor switch uses diode and positive temperature coefficient resistance in series with latter

摘要

The protection circuit has a voltage source (Vm), a reference voltage source (Vref), a voltage comparator (10) and a positive temperature coefficient resistance (20), connected in series with a diode (6) and the monitored power semiconductor switch (2) and thermally coupled with the latter. An Independent claim for an overcurrent and/or over-temperature detection method for a power semiconductor switch is also included.