公开(公告)号：US20150061604A1

公开(公告)日：2015-03-05

申请号：US14322111

申请日：2014-07-02

Applicant: Generalplus Technology Inc.

Inventor： DOWN XU CHUANG ,  DEYING ZHANG

IPC: H02J7/00 ,  H02J7/02

CPC classification number: H02J7/0036 ,  H02J7/0047 ,  H02J7/0068 ,  H02J7/025 ,  H02J50/12

Abstract: A wireless charging circuit and an abnormal state protection circuit thereof is provided in the present invention. The wireless charging circuit includes a power converter, a resonant circuit and an abnormal state protection circuit. The power converter receives an input voltage for outputting a PWM (pulse width modulation) signal. The input terminal of the resonant circuit receives the PWM signal. The common voltage terminal of the resonant circuit is coupled to a common voltage. The abnormal state protection circuit includes a DC sampling circuit and a control circuit. The DC sampling circuit is coupled to the resonant terminal of the resonant circuit for sampling the DC component of the voltage of the resonant terminal to obtain a DC voltage. The control circuit is coupled to the power converter and the DC sampling circuit for receiving the DC voltage. When the DC voltage is greater than a threshold voltage, the control circuit controls the power converter to reduce the current flowing through the resonant circuit.

Abstract translation: 本发明提供一种无线充电电路及其异常状态保护电路。 无线充电电路包括功率转换器，谐振电路和异常状态保护电路。 功率转换器接收用于输出PWM（脉宽调制）信号的输入电压。 谐振电路的输入端接收PWM信号。 谐振电路的公共电压端子耦合到公共电压。 异常状态保护电路包括直流取样电路和控制电路。 DC采样电路耦合到谐振电路的谐振端子，用于对谐振端子的电压的DC分量进行采样以获得DC电压。 控制电路耦合到功率转换器和DC采样电路，用于接收直流电压。 当DC电压大于阈值电压时，控制电路控制功率转换器以减少流过谐振电路的电流。