A rectifier for power factor correction at the receiving end of a wireless power transmission system

Abstract

The invention discloses a power factor correction rectifier at the receiving end of a wireless power transmission system. The front stage of the invention utilizes the principle of resonance between the inductance and the capacitance to realize the power factor correction technology of the medium and high frequency current continuous conduction mode. By reducing the switching frequency, the switching loss is reduced, and the influence of high-frequency parasitic parameters is reduced. A variety of DC-DC converters, such as Buck converters, Buck-Boost converters, and Zeta converters, can be connected to the post-stage to flexibly control the output voltage.

Description

Technical field [0001] The present invention relates to the field of AC-DC power factor correction, in particular to a power factor correction rectifier at the receiving end of a wireless transmission system Background [0002] With the maturity and wide application of power electronics technology and wireless transmission technology, AC-DC rectifier converters have been rapidly developed. At the same time, due to the increasing requirements of users and manufacturers for the power density of converters, the development of power electronics technology tends to be high-frequency. Please refer to Figure 1 ， Figure 1 For the structure of the traditional full-bridge rectifier schematic, the full-bridge rectifier in the prior art consists of four uncontrollable diodes, resulting in a very low input current power factor, damaging the power quality and overall efficiency of the system, and bringing harmonic pollution and electromagnetic interference, affecting the operation of other equ...

AI Technical Summary

Problems solved by technology

However, since the output voltage at the transmitting end of the wireless power transmission system is a high-frequency AC voltage, usually tens of thousands of hertz to megahertz, in order to achieve power factor correction, at the receiving end, namely figure 2 The frequency of the switching tube in the shown converter needs to reach its input voltage frequency, that is, hundreds or even thousands of times of the output voltage frequency of the transmitting end of the wireless power transmission system. In terms of current semiconductor technology, the cost of switching tubes with such a frequency is relatively low. High, not conducive to the application and promotion of the industry

In addition, due to the switching loss of the switching device, the high-frequency hard switching conduction method will cause huge energy loss and greatly reduce the system efficiency

In addition, because high-frequency circuits must consider the influence of parasitic parameters, it will also bring difficulties to circuit design and electromagnetic compatibility design

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