中文摘要：

本文提出采用两路占空比相同但具有一定相位差的PWM控制方法，可以在不影响响应速度的情况下减小电流纹波。分析了H半桥型励磁功放工作原理，给出了0～180。移相的电流纹波统一计算公式。以应用的开关功放为例，进行大量的仿真和实验，结果表明了上述理论分析和纹波计算公式的正确性。该方法简单有效，具有一定的应用价值。

英文摘要：

A proper control method which is of two same duty ratio PWM signals with different phases is proposed to reduce the current ripple without effecting the response speed. The working principle of the H half-bridge excitation current switching power amplifier is analyzed and the calculation function current ripple with 0-180° phase shift is obtained. By using a practical switehing power amplifier as an illustrative example, numerical simulation and experimental method are implemented. The consistency of the simulation results and experimental results indicate that foregoing theoretical analysis and the current ripple calculation function are reasonable. The phase shifting method is valuable and easy to implement in practice.