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System and method for controlling unit power factor single-level AC-DC converter

A unit power factor, AC-DC technology, applied in control/regulation systems, DC power input conversion to DC power output, AC power input conversion to DC power output, etc., can solve the problem of complex control circuits, high cost, and conversion efficiency. Lowering and other issues

Active Publication Date: 2014-08-13
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of AC-DC isolated converter adopts two-stage high-frequency conversion, that is, PFC high-frequency conversion and isolated DC-DC high-frequency conversion, which reduces the conversion efficiency, because these two high-frequency conversions require two sets of control systems with different functions , so it has the disadvantages of complex control circuit and high cost

Method used

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  • System and method for controlling unit power factor single-level AC-DC converter
  • System and method for controlling unit power factor single-level AC-DC converter
  • System and method for controlling unit power factor single-level AC-DC converter

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Experimental program
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Effect test

Embodiment 1

[0067] figure 2 Rectifier 2 in image 3 Realization, DC-DC isolated converter 3 by Figure 5 Realization, it constitutes a unidirectional unit power factor single-stage full-bridge AC-DC isolation converter main circuit topology, and its power is transmitted from the input AC side (AC) side to the direct current (DC) side load (ie figure 2 In, the power is transmitted from the left to the right). Primary side DC bus current i d1 The detection can be used to detect the switch tube current i s2 And i s4 Or i s1 And i s3 Replaced after addition, the secondary side DC bus current i d2 The detection can be used to detect the switch tube current i s6 And i s8 Replace after addition.

Embodiment 2

[0069] figure 2 Rectifier 2 in Figure 3a Realization, DC-DC isolated converter 3 by Figure 5a Realization, it constitutes a one-way unit power factor single-stage full-bridge grid-connected DC-AC isolation converter main circuit topology, and its power is transmitted from the DC side (DC) load to the input AC side (AC) side (ie figure 2 In, the power is transmitted from the right to the left). Primary side DC bus current i d1 The detection can be used to detect the switch tube current i s2 And i s4 Replaced after addition, the secondary side DC bus current i d2 The detection can be used to detect the switch tube current i s6 And i s8 Or i s5 And i s7 Replace after addition.

Embodiment 3

[0071] figure 2 Rectifier 2 in image 3 Realization, DC-DC isolated converter 3 by Image 6 To achieve, it constitutes a unidirectional unit power factor single-stage half-bridge AC-DC isolation converter main circuit topology, and its power is transmitted from the input AC side (AC) side to the direct current (DC) side load (ie figure 2 In, the power is transmitted from the left to the right).

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Abstract

The invention discloses a system and method for controlling a unit power factor single-level AC-DC converter. The system comprises a composite controller, and the composite controller receives a secondary side direct current bus voltage and current signal and a secondary side direct current reference voltage and current signal of the single-level AC-DC isolation converter and converts the received voltages and the currents into an effective alternating current reference value. The effective alternating current reference value and the voltage value are calculated through a multiplying unit into a primary side current reference signal, and the primary side current reference signal, a primary side current signal, a primary side voltage signal and a secondary side voltage signal are input into a current controller. According to the system and method, both-way and single-level AC-DC or DC-AC isolation converting can be achieved, the system is conveniently used in battery charging / discharging or photovoltaic grid connection generating, the cascading modularization single-level isolation AC-DC conversion can be achieved, and the system serves as a power electronic transformer to be applied to high-voltage alternating current input application occasions.

Description

Technical field [0001] The invention relates to the technical field of power electronic conversion, in particular to an isolated single-stage AC-DC isolated converter with unit power factor and a control method thereof. Background technique [0002] AC-DC isolation converters are generally composed of rectifiers and isolated DC-DC converters. This type of AC-DC converters require parallel connection of large-capacity filter capacitors after the rectifier, and therefore have a low power factor. In order to improve the power factor, the prior art generally adopts a power factor correction (PFC) circuit between the rectifier and the isolated DC-DC converter, such as figure 1 Shown. This type of AC-DC isolation converter adopts two-stage high-frequency conversion, namely PFC high-frequency conversion and isolated DC-DC high-frequency conversion, which reduces the conversion efficiency. Because these two-stage high-frequency conversion require two sets of control systems with differen...

Claims

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Application Information

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IPC IPC(8): H02M7/04H02M7/219H02M3/335
CPCY02E10/56
Inventor 王广柱王明达李峰张勋王婷
Owner SHANDONG UNIV
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