A novel auxiliary circuit for eliminating standby power in wireless chargers

Wireless charging systems have become increasingly popular, but they still suffer from standby power consumption even after batteries are fully charged. Recently, CPT wireless power transmission technology has been adopted. However, it can cause voltage spikes to damage the components when the battery is moved after complete charging. To address these issues, a low-cost circuit is proposed to eliminate standby power consumption. A microcontroller unit is used to control the switch of the power source. When the battery is fully charged, the switch will be turned off. Therefore, zero standby power consumption can be achieved by cutting off the power source from both the main circuit and the standby power reduction circuit. Experimental results show that the proposed circuit effectively eliminates standby power consumption while maintaining charging efficiency. This circuit can be easily implemented in wireless charging systems and can help improve energy efficiency and reduce power consumption.