CIRCUIT TO RESTRICT OUTPUT VOLTAGE OF POWER TRANSISTOR

摘要

PROBLEM TO BE SOLVED: To provide a circuit for limiting the output voltage of a power transistor TR which prevents a parasitic element from being triggered and is simple at a low cost and reduces a production failure rate. SOLUTION: This circuit which limits the output voltage of a power TR T1 connected in series to a resonance load ZL between a first electrode VS and a second electrode (GND) of a supply voltage generator is provided with a semiconductor junction device 40 which is provided with a first terminal A connected to the first electrode Va of the supply voltage generator, a second terminal K connected to a common circuit node VC between the power TR T1 and the resonance load ZL, and a third terminal G connected to a reference voltage of a prescribed value E.