Analysis and Implementation of a Half Bridge Class-DE Rectifier for Front-End ZVS Push-Pull Resonant Converters
Analysis and Implementation of a Half Bridge Class-DE Rectifier for Front-End ZVS Push-Pull Resonant Converters
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用于前端 ZVS 推挽谐振转换器的半桥 DE 类整流器的分析与实现
DOI：
10.6113/jpe.2013.13.4.626
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发表时间：
2013
影响因子：
1.4
通讯作者：
K. Jirasereeamornkul
中科院分区：
文献类型：
--
作者：
C. Ekkaravarodome;K. Jirasereeamornkul
分析了谐振整流器中结电容对谐振电路工作点的影响，指出整流二极管的结电容与理想整流二极管的结电容相比，降低了电路中的谐振电流和输出电压。这可以由简化的串联谐振等效电路和在谐振电容器的变化值处的电压传递函数与归一化工作频率的关系来表示。以低压转高压推挽式DC/DC谐振变换器为例进行了设计。设计过程是基于半桥DE类谐振整流器的原理，这确保了更准确的结果。该方案提供了一个更系统和可行的解决方案比传统的谐振推挽DC/DC变换器的分析方法。为了提高电路效率，主开关管和整流二极管可以分别工作在零电压和零电流开关条件下。为了实现这一目标，DC/DC转换器的参数需要被适当地设计。详细分析和设计了该DC/DC变换器的组成部分。样机的开关频率为62-88 kHz，输入电压为12 VDC，输出电压为380 VDC，额定输出功率为150 W。仿真和实验结果证实了该方法的有效性。
An analysis of the junction capacitance in resonant rectifiers which has a significant impact on the operating point of resonance circuits is studied in this paper, where the junction capacitance of the rectifier diode is to decrease the resonant current and output voltage in the circuit when compared with that in an ideal rectifier diode. This can be represented by a simplified series resonant equivalent circuit and a voltage transfer function versus the normalized operating frequency at varied values of the resonant capacitor. A low voltage to high voltage push-pull DC/DC resonant converter was used as a design example. The design procedure is based on the principle of the half bridge class-DE resonant rectifier, which ensures more accurate results. The proposed scheme provides a more systematic and feasible solution than the conventional resonant push-pull DC/DC converter analysis methodology. To increase circuit efficiency, the main switches and the rectifier diodes can be operated under the zero-voltage and zero-current switching conditions, respectively. In order to achieve this objective, the parameters of the DC/DC converter need to be designed properly. The details of the analysis and design of this DC/DC converter’s components are described. A prototype was constructed with a 62–88 kHz variable switching frequency, a 12 VDC input voltage, a 380 VDC output voltage, and a rated output power of 150 W. The validity of this approach was confirmed by simulation and experimental results.