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首页> 外文期刊>Emerging and Selected Topics in Power Electronics, IEEE Journal of >High-Switching-Frequency TCM Digital Control for Bidirectional-Interleaved Buck Converters Without Phase Error for Battery Charging
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High-Switching-Frequency TCM Digital Control for Bidirectional-Interleaved Buck Converters Without Phase Error for Battery Charging

机译：用于双向交错的降压转换器的高开关频率TCM数字控制，电池充电没有相位误差

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摘要

This article proposes a high-performance, high-switching-frequency triangular-conduction-mode (TCM) bidirectional-interleaved buck converter for battery charging using digital control. Accurate conditions for achieving zero-voltage switching (ZVS) without zero-crossing detection (ZCD) are derived while considering the nonlinear parasitic capacitance of the switch components. This article also optimizes the method of calculating the switching frequency to reduce the delay time of pulsewidth modulation, thereby enhancing system stability. The conventional control method has inadequate resolution in the phase shift register of the digital controller under high switching frequency, hindering perfect interleaving of the two phases at 180 degrees, which affects the characteristics of current ripple offset. The proposed control method effectively reduces the phase error between the two phases in an interleaving structure under high-frequency operation. In this way, full-range ZVS can be achieved when the circuit operates at the correct switching frequency. ANSYS Q3D Extractor software is employed to simulate the impedances of the power loops and investigate parasitic parameters, enabling optimization of the layout and modification of the switching frequency. An experimental prototype of a bidirectional buck converter using GaN switches was implemented with an output power of 1 kW, an input voltage of 66 V, an output voltage of 35-50 V, a switching frequency of 350 kHz-1 MHz, a highest efficiency of 97.52%, and a power density of 10 W/cm(3).
机译：本文提出了一种高性能，高开关频率三角形导电模式（TCM）双向交错的降压转换器，用于使用数字控制电池充电。在考虑开关组件的非线性寄生电容的同时导出在没有过零检测（ZCD）的零电压切换（ZVS）的准确条件。本文还优化了计算开关频率以减少脉冲宽度调制延迟时间的方法，从而提高了系统稳定性。传统的控制方法在高开关频率下，数字控制器的相移寄存器中的分辨率不足，在180度下妨碍两个阶段的完美交织，这影响了电流纹波偏移的特性。所提出的控制方法在高频操作下有效地减少了两个相位之间的两个阶段之间的相位误差。以这种方式，当电路以正确的开关频率运行时，可以实现全范围的ZV。 ANSYS Q3D Extractor软件用于模拟电源环的阻抗，并调查寄生参数，从而能够优化开关频率的布局和修改。使用GaN开关的双向降压转换器的实验原型，输出功率为1 kW，输入电压为66 V，输出电压为35-50 V，开关频率为350 kHz-1 MHz，效率最高97.52％，电力密度为10 w / cm（3）。

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