Single inductor bridgeless APFC circuit based on IGBT module

Abstract

The invention discloses a single inductor bridgeless APFC circuit based on an IGBT module, and the circuit comprises an AC filter capacitor C1, a first IGBT module S1, a second IGBT module S2, an inductor L, a first power diode D1, a second power diode D2, a third power diode D3, a fourth power diode D4, a DC filter capacitor E1, a first divider resistor R1 and a second divider resistor R2; the anode of the first power diode D1, the first end portion of the AC filter capacitor C1 and a collector electrode of the first IGBT module S1 are connected with a power supply fire wire; the anode of the fourth power diode D4, the second end portion of the AC filter capacitor C1 and the collector of the second IGBT module S2 are connected with a power supply zero line; the emitting electrode of the first IGBT module S1, the first end portion of the inductor L and the cathode of the second power diode D2 are connected; and the emitting electrode of the second IGBT module S2, the second end portion of the inductor L and the cathode of the third power diode D3 are connected.

Description

technical field [0001] The invention relates to a single-inductance bridgeless APFC circuit based on an IGBT module in the field of single-phase power factor correction. Background technique [0002] In a single-phase power grid, an uncontrolled rectifier bridge and electrolytic capacitors are used as the power electronic converter of the front-stage circuit. No matter what kind of impedance load is connected to the rear stage, it is a nonlinear load, which will cause harmonic current pollution to the power grid and cannot meet the requirements. The harmonic current limit specified in IEC 61000-3-2 and IEC 61000-3-1, and the grid side power factor is low, so power factor correction measures must be adopted. [0003] However, the traditional bridgeless power factor corrector must use two inductors, the current flow direction is uncertain, the low-frequency diode and the diode in the IGBT module may be turned on at the same time, which increases the instability factor, and the...

AI Technical Summary

Problems solved by technology

[0004] After searching the existing technology of bridgeless power factor correctors, for example, the document "Analysis and Design of Single-phase Bridgeless Power Factor Corrector" published in the 8th issue of "Electrical Applications" in 2015 proposes a single-phase non-circulating current type Bridgeless APFC adopts single-cycle control, but this circuit is the same as the traditional bridgeless APFC, it is a dual-inductance circuit, the cost is high, and the space occupied is large, which does not meet the development direction of the current power factor corrector.

[0005] Based on the above, after searching the existing technologies of bridgeless power factor correctors, it is found that the existing circuits are all double-inductor structures, which cannot meet the needs of current practical applications.

Images