⚡ 本页包含 AI 生成的分析内容，仅供参考
本文提出一种单芯片Qi兼容的40W无线功率发射控制器，采用RMS线圈电流检测和自适应ZVS技术，以提高效率和安全性。通过静态线圈Q因子测量实现异物检测，整体发射端效率提升高达1.7%。
overall PTx efficiency is increased up to 1.7% depending on the PTxOUT. Filippo Neri1, Gus Mehas2, Fabio Di Fazio1, Giovanni Figliozzi1, Jure Menart1, Marcin Augustyniak1, Turev Acar2, Amit Bavisi2 Foreign object detection (FOD) is a well-known issue in wireless power applications for safety and efficiency reasons [1]. This IC performs the static coil Q-factor measurement using the step response of the LC tank as shown in Fig. 30.10.3. VBRG is generated by a dedicated low voltage buffer to prevent any frequency content propagation from the DC-DC VBRG into the coil system. By turning on the corresponding low side switch, a voltage step is applied to the LC tank, causing voltage oscillations on the LC net. The IC uses a peak detector with a synchronized reset to collect information about the different peaks of the decaying oscillation. This information is processed by the firmware to measure the Q factor of the system and this procedure is the primary FOD method before
which is a routine that can be performed periodically. As shown in Fig. 30.10.2, using, adaptive ZVS improves the EMI figure by ~4dB compared to conventional ZVS, while the