SPWM Inverter Control for Wireless Constant Current and Voltage Charging

Constant current (CC) and constant voltage (CV) charging of batteries is a crucial research area in the practical implementation wireless power transfer (WPT) systems. The typical process battery starts from mode. As battery’s increases, mode switches to During charging, equivalent load resistance will vary with time, affect or system’s efficiency. In this study, an adaptive method CC-CV proposed based on sinusoidal pulse width modulation (SPWM) inverter control. WPT circuit detects variation by measuring parameters current, accurately controls system output adjusting depth SPWM primary side. When there relative motion between transmitting coil receiving coil, sharp change coupling coefficient directly affects leading fluctuations instability. To solve problem, for estimating which estimates during parameters. Then, controller side adjusts estimated new coefficient, so that can still achieve under displacement distance changes. CC was set 0.75 A, CV 12 V. Simulation experimental results demonstrate validity accuracy control method.