Lossless input current detection method for internal power tube of wireless charging transmitting terminal

The invention provides a lossless input current detection method for an internal power tube of a wireless charging transmitting terminal. The wireless charging transmitting terminal comprises a switching tube Q1, a switching tube Q2, a switching tube Q3 and a switching tube Q4. The method comprises the following steps: detecting breakover current of two lower tubes, namely a switching tube Q2 and a switching tube Q4 in the wireless charging transmitting end, and realizing lossless input current detection by adjusting the switching time sequence of the switching tube Q1, the switching tube Q2, the switching tube Q3 and the switching tube Q4. According to the invention, the conduction current of the two lower power tubes in the wireless charging transmitting end is detected, the switching time sequence of the power tubes is creatively adjusted to prevent the current of the dead zone stages of the two lower power tubes from flowing into the power supply end PVIN, and the detection window signals of the detection