Voltage slope-based zero voltage switching detection method for wireless power transfer systems
Voltage slope-based zero voltage switching detection method for wireless power transfer systems
复制标题
一种基于电压斜率的无线功率传输系统零电压开关检测方法
DOI：
10.1049/el.2018.1130
复制
发表时间：
2018
影响因子：
1.1
通讯作者：
Lu Sizhao
中科院分区：
文献类型：
--
作者：
Li Siqi;Shu Wenbin;Lu Sizhao
本文提出了一种用于无线功率传输（WPT）系统的零电压开关（ZVS）检测方法，该方法依赖于MOSFET导通和关断瞬态过程中的半桥输出电压斜率。提出了一种电压斜率检测电路及其主动控制方法，将纳秒级瞬态信号转换为单片机易于处理的稳定电压电平。通过获得导通和关断电压斜率的信息，可以评估ZVS的状态，以优化开关损耗。为了评估所提出的检测方法的性能，构建了500 kHz三线圈谐振WPT系统。实验结果表明，该方法可以有效地检测零电压开关状态。此外，关断电流可以控制为恒定值，以优化负载和参数变化下的开关损耗。
A zero voltage switching (ZVS) detection method, which relies on the half‐bridge output voltage slopes during the MOSFET turn‐on and turn‐off transient processes, is proposed for the wireless power transfer (WPT) systems in this Letter. A voltage slope detection circuit and its active control method are also proposed to convert the nanosecond transient signal to a steady voltage level, which can be handled by the microcontroller easily. By having the information of the turn‐on and turn‐off voltage slopes, the state of ZVS can be evaluated to optimise the switching losses. A 500 kHz, three‐coil resonant WPT system is built in order to evaluate the performance of the proposed detection method. Experimental results show that the ZVS state can be detected effectively. Also, the turn‐off current can be controlled to a constant value to optimise the switching losses under the load and parameter variations.