AUTOMATIC VOLTAGE REGULATOR FOR AC GENERATOR

摘要

PURPOSE:To simplify a circuit of an automatic voltage regulator for an AC generator by computing a firing angle by a microprocessor. CONSTITUTION:An A/D converter 16 digitally converts a voltage between U- phase and W-phase, and inputs it to a microprocessor 17. A programmable interrupt controller 19 produces an interrupt signal to the microprocessor 17 whenever detecting zero crossing point of a voltage between the U-phase and the W-phase. The microprocessor 17 calculates a firing angle in response to the difference between an input voltage from the converter 16 and a reference voltage. When an interrupt signal is applied from the controller 19, the microprocessor 17 sets the computer firing angle in a programmable timer 20. The timer 20 produces a trigger pulse of a thyristor 10 after the set period of time.