High-efficiency high-power-factor two-way AC/DC converter

A high power factor, high efficiency technology, applied in the direction of output power conversion device, AC power input conversion to DC power output, high-efficiency power electronic conversion, etc., can solve the problem of low power conversion efficiency or utilization rate, and achieve high efficiency and power factor, to achieve the effect of protection and fast dynamic response

Inactive Publication Date: 2014-07-16
SHAANXI UNIV OF SCI & TECH
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  • Description
  • Claims
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of low conversion efficiency or utilization rate of electric energy in the field of solar power generation and electric vehicles in the background technology, and propose a bidirectional AC-DC converter with high efficiency and high power factor. It can work in AC to DC mode or DC to AC mode. When working in AC to DC mode, it can take power from the grid or recycle the braking energy of the motor. When working in DC to AC mode, it can reverse Sending electrical energy to the grid or powering a motor

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Embodiment Construction

[0021] The specific implementation of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0022] see figure 1 , the present invention includes a DSP with several PWM output terminals, a first MOS transistor Q1, a second MOS transistor Q2, a third MOS transistor Q3, a fourth MOS transistor Q4, a fifth MOS transistor Q5, a sixth MOS transistor Q6, a fourth MOS transistor Inductor L4 and drive circuit;

[0023] Wherein, the drain of the first MOS transistor Q1 is connected to the drain of the third MOS transistor Q3 and then connected to one end of the fourth inductor L4; after the source of the first MOS transistor Q1 is connected to the drain of the second MOS transistor Q2, connected to one end of the AC input; the source of the third MOS transistor Q3 is connected to the drain of the fourth MOS transistor Q4, and then connected to the other end of the AC input; the sources of the second MOS transistor Q2 and the fourth MOS...

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Abstract

The invention discloses a high-efficiency high-power-factor two-way AC / DC converter. The high-efficiency high-power-factor two-way AC / DC converter is controlled through a high-performance DSP chip, and sampling circuits are used for sampling voltages and currents on the AC side and DC side. After entering a DSP, sample data are subjected to analog-digital conversion firstly and then are processed according to an algorithm edited in advance, so that the PWM duty ratio is adjusted. PWM passes through a driving circuit, controls MOS transistors and adjusts output; if the sample data are abnormal, it shows that the circuit fails; at the moment, all the MOS transistors can be blocked, and the circuit can be protected. Through the high-efficiency high-power-factor two-way AC / DC converter, the efficiency reaches above 90 percent, and the power factor reaches above 0.97. The high-efficiency high-power-factor two-way AC / DC converter is fast in dynamic response and can protect the circuit when overcurrent, overvoltage and undervoltage faults happen to the circuit.

Description

technical field [0001] The invention belongs to the technical field of power electronic converters, in particular to a bidirectional AC-DC converter with high efficiency and high power factor. Background technique [0002] With the excessive consumption of oil, coal and other resources, the energy crisis has gradually approached, and the pollution caused by it has become more and more serious, especially the increasingly serious smog weather has had a greater impact on people's life and health The key to reducing fossil energy consumption lies in the development of alternative, recyclable, and non-polluting energy sources. Solar energy and wind energy have been vigorously developed and applied due to their sustainable, non-polluting, and abundant existence, and have achieved certain economic, environmental benefits. At the same time, electric vehicles, which use electricity as energy, get rid of the dependence on traditional energy sources, and have environmental protection...

Claims

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Application Information

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IPC IPC(8): H02M7/797H02M1/42H02H7/10
CPCY02B70/10
Inventor 史永胜王喜锋余彬胡双宁青菊
Owner SHAANXI UNIV OF SCI & TECH
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