Peak shut-off electronic switch

摘要

A control transistor and a pnpn device are arranged in serial combination with each other, as well as with a source of alternating current and a load. The transistor and pnpn device in combination behave as a two-state semiconductor switch for switching cyclically varying currents and voltages of amplitude greater than the punch-through voltage limit of the transistor. The switch conducts an unrectified, cyclically varying waveform by operation of a diode biasing scheme. Circuitry responsive to voltage peaks of the source causes the transistor to periodically open the circuit for a short duration, thereby discontinuing the transmission of energy to the load within a fraction of a cycle after a discontinuation command signal is received.