Power factor correction rectifier for receiving end of wireless power transmission system

Abstract

The invention discloses a power factor correction rectifier for a receiving end of a wireless power transmission system. The principle of inductance and capacitance resonance is utilized in the preceding stage, and the power factor correction technology of a medium-high frequency current continuous conduction mode is achieved. By reducing the switching frequency, the switching loss is reduced, and the influence of high-frequency parasitic parameters is reduced. The rear stage can be connected with various DC-DC converters, such as a Buck converter, a Buck-Boost converter and a Zeta converter, so that the output voltage can be flexibly controlled.

Description

technical field [0001] The 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 power transmission system Background technique [0002] With the maturity and wide application of power electronics technology and wireless power transmission technology, AC-DC rectifier converters have developed rapidly. At the same time, as users and manufacturers have higher and higher requirements on the power density of converters, the development of power electronics technology tends to be high frequency. Please refer to figure 1 , figure 1 The schematic diagram of the structure of the traditional full-bridge rectifier, the full-bridge rectifier in the prior art is composed of four uncontrollable diodes, resulting in extremely low input current power factor, which damages the power quality and the overall efficiency of the system, and brings Harmonic pollution and electromagnetic interfere...

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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