高精度低频压电换能器电源的设计

Design of High Precision Power Supply for Low-frenquency Piezoelectric Transducer

压电换能器的工作频率要求稳定,且能随负载变化而连续调节;其工作电压要求是平滑而稳定的正弦波。为此,研制了一种高精度的低频压电换能器电源。该电源将有效频带细分成几个子频段,利用可编程逻辑阵列和锁相环技术,对正弦波形进行多频段数字拟合,从而在整个有效频带内都能得到理想的正弦波。在功率输出级采用OCL互补对称功率放大电路,并对该功放电路增加电压负反馈,使得输出的正弦电压信号平滑而稳定。

The frequency of piezoelectric transducer requires stable and can also continuously tuning with the varying of load. The voltage requires being smooth and stable sine wave. To the two problems, a high precision power supply for low-frequency piezoelectric transducer is designed. It divides the whole frequency band into several small bands. By means of programmable array and phase-locked loop, the sine wave is digitally fitted individually at each small band. So the sine wave can be always suitable at the whole frequency band. At the power output, OCL complementally and symmetrical power amplifier is adapted. The output sine voltage becomes smooth and stable by adding voltage-negative-feedback to power amplifier.