Electronic polarity reversing switch for DC voltages - has two pairs of complementary transistors forming switched bridge

摘要

The electronic polarity reversing switch, for dc voltages, consists of a pnp transistor in series with an npn transistor across the dc poles and is controlled by a keyed HF signal. A second pnp and second npn transistor are connected in series with one another and in parallel with the first pair of series transistors. The two npn transistors (T3, T4) are cross connected via resistors base to collector. Capacitors (C1, C2) shunt the base/emitter junctions of the other two transistors whose bases are connected via diodes (D1, D2) to which the control signal (E) is applied. The output (A, B) is taken from the npn transistors' collectors.