Patent ID: 6236192
Filing Date: 2001-05-22
Classification: H02M

Abstract:
An AC voltage regulator comprising:a high-frequency transformer, a first bi-directional semiconductor switch circuit, a second bi-directional semiconductor switch circuit and a third bi-directional semiconductor switch circuit;wherein an input AC voltage is ring-modulated by said first bi-directional semiconductor switch circuit to obtain a ring-modulated voltage, and the ring-modulated voltage is transformed at a high frequency by said high-frequency transformer and then demodulated by said second bi-directional semiconductor switch circuit to obtain an AC demodulated voltage, and the AC demodulated voltage is added to the input AC voltage to obtain an AC raised voltage, and the AC raised voltage is pulse width modulated by said third bi-directional semiconductor switch circuit, which is controlled to become ON only while said second bi-directional semiconductor switch circuit is OFF, and the AC raised voltage is continuously regulated by continuous regulation of a duty ratio D of said second bi-directional semiconductor switch circuit in the pulse width modulation.