AC voltage stabilizer circuit and three-phase AC voltage stabilizer

Abstract

The invention relates to an AC voltage stabilizer circuit and a three-phase AC voltage stabilizer. The AC voltage stabilizer circuit comprises an AC input terminal, an AC output terminal, a bridge type Boost circuit, an energy-storage circuit, a full bridge inverter circuit and a control circuit, wherein the bridge type Boost circuit is connected with the AC input terminal and used for carrying out voltage boosting and power factor correction processing on the AC input and converting the AC input into DC; the output terminal of the full bridge inverter circuit is connected with the AC output terminal and used for inverting electrical energy stored in the energy-storage circuit into the AC output; and the control circuit provides a PWM modulating signal and a power frequency control signal for the bridge type Boost circuit and the full bridge inverter circuit. The three-phase AC voltage stabilizer comprises three AC voltage stabilizer circuits, and the input terminals of the three AC voltage stabilizer circuits are connected to three phase lines of three-phase AC respectively. Because the high frequency technology is adopted, a rectifying circuit and an inverter circuit are full bridge transform circuits, and the stress of each switching device is small, the whole device has the advantages of light weight, miniaturization and low cost.

Description

technical field [0001] The present invention relates to power supply technology, more specifically, relates to an AC voltage stabilizer circuit and a three-phase AC voltage stabilizer regulated by PWM. Background technique [0002] AC voltage stabilizers are widely used in various industries. The current AC voltage stabilizers use large power frequency electromagnetic components for voltage regulation or compensation and stabilization. They are mainly divided into brushed and brushless. Brushed voltage regulators It is mainly through the movement of the brush on the self-coupling transformer to change the transformation ratio to achieve the purpose of voltage regulation. A brushless voltage regulator similar to this method mainly switches the ratio through relays or SCRs. A typical circuit such as figure 1 Its main disadvantage is that it requires power frequency magnetic components, which are large in size, heavy in weight, low in efficiency and high in cost. Contents o...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a new type of AC voltage stabilizer circuit in view of the defects of low efficiency and high cost of the above-mentioned AC voltage stabilizer in the prior art

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