摘要:无线充电技术，是利用电磁波感应原理或是交流感应原理，使充电器和用电装置之 间以磁场传送能量而不用传统电导线的一项充电技术。该技术因供电灵活、安全可靠等优 点近年来备受关注。

本文以串并补偿非接触谐振变换器为研究对象，通过研究其自激控制，使系统即使在 参数变化的情况下也能有良好的动态特性。本文研究了变换器的输出电压增益，研究表明， 逆变器开关的通断可以通过检测变换器副边电流过零点来控制。从而使变换器工作在高频 增益交点处，则输出的电压增益就与负载无关，以此来实现串并补偿非接触谐振变换器的 自激控制。90927

本文为了检测变换器副边电流的相位，引入了非接触电流互感器，详细分析了其工作 原理，基于电路不同单元时间的延迟对电流相位造成的影响，加入了补偿电路。

最后，本文完成了带有启动电路、补偿电路、过零比较单元以及驱动单元的驱动板的 硬件焊接，下一步的工作将通过检测其输出波形证明自激控制的可行性。

毕业论文关键词：自激控制，串并补偿非接触谐振变换器，非接触电流互感器

Abstract: Wireless charging technology is based on the principle of electromagnetic wave sensing or the AC induction 。 The technology is used to transmit energy between the charger and electrical device via magnetic field without the traditional electric wire。 In recent years, the technology has attracted much attention due to the advantages of power supply flexibility, safety and reliability。

In this paper, the non-contact resonant converter with S/P compensation topology is  treated as the research object。 By studying its self-excited control, the system will own good dynamic characteristics even in the case of parameter variation。 In this paper, the output voltage gain  of the converter is studied。 It is shown that the on / off of the inverter switches can be controlled by detecting the zero crossing point of the secondary current。 Then, the converter will operates at the gain intersection with high frequency。 Thus, the output  voltage  gain  is  independent of the load , and the self-excited control of the non-contact resonant converter is achieved。In this paper, in order to detect the phase of the secondary current of the converter, a non-contact current transformer is introduced。 The working principle is analyzed in detail。 Based on the delay of the current phase influenced by different unit, the compensation circuit is added。Finally, the hardware welding with the starting circuit, the compensation circuit, the zero-crossing comparison unit and the drive plate of the drive unit is finished。 The feasibility of the self-excitation control system will be verified by detecting its output waveform。

Keywords: self-excited control, serial and parallel compensation non-contact resonant converter, non-contact current transformer

目录

1．绪论 6

1。1 引言 4

1。2 WPT 技术介绍 7

1。2。1 微波 WPT 7

1。2。2 电磁感应式 WPT 7

1。2。3 电磁共振式 WPT 7

1。3 本文研究内容 8

2。串并补偿非接触谐振变换器的自激控制策略及工作特性 8

2。1 引言 8

2。2 串并补偿非接触谐振变换器的基波等效模型 9

2。3 串并补偿非接触谐振变换器的自激控制