一种新的闭环控制电压型功率放大器

Voltage-based close-loop controlled switched-mode power amplifier

该文研制出一种新型的电压型电力电子功率放大器,它能把一定频率范围内任意形状的参考波形放大成为稳定的功率级电压源。它采用了电压闭环负反馈以及有效的PID调节环节和相应的超前校正环节,能保证很小的失真率和快速的动态响应能力。所研制的样机在保证功率和效率的同时,使波形失真率在0～1kHz范围内小于1%。波形的动态响应速度很快,上升时间小于30μs,调整时间小于100μs,超调量小于1%。实验结果表明:这种设计和传统的开关功率放大器相比,输出波形显著改善而且动态响应速度更快。

A switchedmode power amplifier based on a closedloop voltage feedback technique was developed to amplify arbitrarilyshaped referenced voltage signals as a steady voltage source. The control circuit used very efficient PID modulation and anticipatory control so the power amplifier had little distortion and fast dynamic response. The prototype had a distortion ratio of less than 1% for 0～1 -*7kHz bandwidth. The system dynamic response was fast, with a rise time of less than 30 μs, an adjusting time of less than 100 μs, and overshoot of less than 1%. Experimental results show that the amplifier significantly improves the output waveform with faster dynamic respondence than a common ClassD power amplifier. 