Zero cross control circuit

Abstract

Abstract PURPOSE:To obtain an excellent waveform-shaped zero cross signal with a simple circuit constitution, by applying the zero cross signal generated at an output terminal of a control transistor(TR) to a control circuit. CONSTITUTION:A TR10 is biased and turned on, while a voltage of an AC power supply 1 is larger than a voltage of a power supply 6 of a control circuit 5, since a charging current flows to the power supply 6 of the control circuit through a diode bridge 2 and an emitter-base junction of the TR10 from the power supply 1. Further, while the voltage of the power supply 1 is lower than the voltage of the power supply 6 of the control circuit, since the emitter-base junction is biased reverse, the TR10 turns off. Thus, the zero cross signal as the input to the circuit 5 is obtained.

Inventors

• 👤 Shigeki Hosogoe
• 👤 細越　茂基

Bibliographic Details