Middle phase power-fetching type phase front/phase tail synchronized modulation circuit

摘要

A middle phase power-fetching type phase front/phase tail synchronized modulation circuit, comprising: a power supply unit, that is used to fetch power from the middle phase of an ordinary AC voltage waveform, and supplies it to a phase front/phase tail modulation unit as a normal operating voltage after rectification; and a phase front/phase tail modulation unit, it includes an MCU microcomputer, to control a driving circuit to turn-on, and control synchronously at least two bi-directional electronic power element, to generate a phase front/phase tail turn-on modulation signal. As such, while performing synchronous modulation from phase middle, phase front/phase tail can be retracted inward or expanded outward at the same time, so that phase front/phase tail turn-on output voltage average values complement each other, hereby achieving stable and modulated power supply.

主权项

1. A middle phase power-fetching type phase front/phase tail synchronized modulation circuit, comprising:
a power supply unit, and a phase front/phase tail modulation unit, including an MCU microcomputer, a light coupling switch, a driving circuit, and two bi-directional electronic power supply elements, wherein, said power supply unit is used to fetch power from a middle phase of an ordinary AC voltage waveform, and supplies it to said phase front/phase tail modulation unit as a normal working voltage after rectification, and wherein said MCU microcomputer controls said driving circuit separated by said light coupling switch to turn-on, to control synchronously at least two Power MOSFETs of bi-directional electronic power supply elements, so as to generate a phase front/phase tail turn-on modulation signal; wherein said power supply unit supplies power to said driving circuit through a constant current circuit; wherein said power supply unit further includes an AC zero voltage activation and sampling circuit, to activate said electronic power element at zero voltage.