Three-level double boost energy feedback PWM rectification circuit and control method thereof

Abstract

Disclosed are a three-level dual-booster energy-feedback PWM rectifying circuit and the control method thereof, which belongs to PWM rectifying circuit and the control method. The PWM rectifying circuit can work at the AC/DC rectifying mode and the DC/AC energy-feedback mode, and includes a input power supply (2), two booster bridge circuits (1, 3) and an output filtering circuit (4). The control block diagram includes a voltage outer loop, a phase lock and sine wave generation circuit, an equalizing ring, a current inner loop, a zero-crossing comparing unit and an output logic circuit. Compared with traditional half bridge and dual booster rectifying circuit, the circuit adds a zero level at the middle of the bridge, thereby effectively reduces the electromagnetism interference of the circuit; the two bridge circuits works in turn at the half cycle of the power network. The voltage stress of the power switch tube of the circuit is low, which is only half of the output voltage; the energy can flow bidirectionally; the bridge has no hidden trouble of direct passing through. The circuit has high working reliability and simple structure, and is suitable for the UPS and aero-space field which requires medium and large power with high reliability.

Description

technical field [0001] The invention relates to a double-boost type energy-feedback PWM rectifier circuit and a control method for the circuit, belonging to a PWM rectifier circuit and a control method. Background technique [0002] Traditional diode uncontrolled rectifier circuits and thyristor phase-controlled rectifier circuits have low input power factors on the grid side and contain a large number of low-order harmonics, which have caused serious pollution to the grid. Passive filters can suppress current harmonics to a certain extent, but the effect is not ideal, and the volume and weight are large, the circuit is heavy, and there is a potential danger of series and parallel resonance with the power grid. PWM rectification technology can realize grid-side current tracking grid voltage, has the advantages of excellent power factor, small size, high efficiency, etc. Wider and wider applications have become one of the focus and hotspots of current power electronics resea...

AI Technical Summary

Problems solved by technology

However, the same as the traditional half-bridge topology, the voltage stress of the power switch tube of the dual-boost energy-feedback PWM rectifier circuit is high, and the selection of the switch tube is difficult.

Moreover, the performance of high withstand voltage power semiconductor devices deteriorates, which affects the overall performance of the circuit

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