In a phase-shifting, zero voltage switching full-bridge converter, the two legs of the full-bridge are switched with two square waves whose phase shift is modulated by the converter’s control loop and the resulting square wave is fed into the primary of the transforms that provides primary-secondary isolation and voltage scaling. Parasitic resonance between the capacitance of the transistors and the transformer’s leakage inductance is exploited to ensure a soft turn-on – ideally zero voltage switching (ZVS) - for all four switches in the primary. To also extend the ZVS range at light loads, a resonance inductor is introduced in series with the primary winding of the transformer. ZVS helps reduce switching losses and stress in addition to removing the need for primary snubbers. It also enables higher switching frequencies which helps in the design of converters with higher efficiency and power density, making this converter well suited for high-power (> 600 W), high-frequency applications. ST offers a range of advanced digital controllers, rectifiers and power MOSFETs with improved reverse recovery time of their intrinsic diode. Our high-performance STM32 microcontrollers with an extended range of dedicated peripherals including high-resolution PWM timers and high-speed ADCs together with our hardware and software evaluation and development tools as well as reference designs enable developers to fully exploit the benefits of full-bridge phase-shift ZVS converters.
ZVS优点
ZVS有助于减少开关损耗和压力，而且不需要初级缓冲电路。它还支持更高的开关频率，有助于设计具有更高效率和功率密度的转换器，使这种转换器非常适合大功率（> 600 W）高频应用。
我们的产品和解决方案
意法半导体提供一系列高级数字控制器、整流器和功率MOSFET（改善了其本征二极管的反向恢复时间）。我们的高性能STM32微控制器（配备扩展的专用外设，包括高分辨率PWM计时器和高速ADC），加上我们的硬件和软件评估与开发工具（包括参考设计），有助于开发人员充分利用移相全桥ZVS转换器的优点。
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