In recent years, resonant converters have been widely used in the fields of electric vehicles and renewable energy systems due to their excellent characteristics in terms of high energy density, high energy efficiency, wide output range, and wide ZVS range. Conventional resonant converters generally adopt pulse frequency modulation (PFM) in a wide range of output applications. This means the frequency varies over a wide range, which results in problems such as high switch loss, large noise, and high EMI. To solve this problem, this paper proposes a hybrid fixed-frequency modulation strategy applied to a wide range of outputs based on the series resonant converter, where asymmetrical voltage-cancellation control (AVC control) and its improved strategy (IAVC control) are applied in the normalized gain ranges of [0.5, 1] and [0, 0.5]. The proposed modulation strategy achieves lower switching loss, higher efficiency, and better ZVS characteristics in wide voltage output and load ranges. Under the same output voltage and power, to realize ZVS, the proposed hybrid modulation has a smaller switching frequency and resonant current, which improves efficiency and reduce losses, especially in the case of low voltage gain and light load conditions. Finally, experimental data obtained from an 80 V input and a 800 W power max prototype circuit are included to verify the proposed hybrid modulation strategy.

近年来，谐振变换器以其高能量密度、高能效、宽输出范围、宽ZVS范围等优异特性在电动汽车和可再生能源系统领域得到广泛应用。传统谐振转换器在广泛的输出应用中通常采用脉冲频率调制 (PFM)。这意味着频率在很宽的范围内变化，从而导致诸如开关损耗高、噪声大、EMI高等问题。为了解决这个问题，本文提出了一种基于串联谐振转换器的适用于大范围输出的混合固定频率调制策略，其中不对称电压抵消控制（AVC 控制）及其改进策略（IAVC 控制）被应用于[0.5, 1] 和 [0, 0.5] 的归一化增益范围。所提出的调制策略在宽电压输出和负载范围内实现了更低的开关损耗、更高的效率和更好的 ZVS 特性。在相同的输出电压和功率下，为了实现 ZVS，所提出的混合调制具有更小的开关频率和谐振电流，从而提高效率并降低损耗，尤其是在低电压增益和轻负载条件下。最后，包括从 80 V 输入和 800 W 功率最大原型电路获得的实验数据，以验证所提出的混合调制策略。这提高了效率并减少了损耗，尤其是在低电压增益和轻负载条件下。最后，包括从 80 V 输入和 800 W 最大功率原型电路获得的实验数据，以验证所提出的混合调制策略。这提高了效率并减少了损耗，尤其是在低电压增益和轻负载条件下。最后，包括从 80 V 输入和 800 W 最大功率原型电路获得的实验数据，以验证所提出的混合调制策略。