高带宽压电陶瓷驱动电源

摘要

Piezoelectric actuator is the critical component in ultrasonic guided wave detection .As the piezoelectric actuator de-mands high power and high bandwidth driving power ,a piezoelectric driving power based on high-voltage amplifier MP 108 was de-signed and developed .The signal source was generated by direct digital frequency synthesis technique then amplified and filtered before sent to the high-voltage amplifier .Thermal dissipation of the driving power was analyzed and the maximum thermal resistance from the heat sink to air is 1.1℃/W.The experiment verifies that the driving power can output 100 Vp-p in bandwidth from 10 kHz to 300 kHz when the load is 10 nf,which can satisfy the request of the ultrasonic guided wave piezoelectric actuator .%压电激振器是超声导波无损检测应用中的关键部件，针对激振器对压电驱动电源高带宽和大功率的要求，设计并研制了一种基于高压运放MP108的压电陶瓷驱动电源。采用直接数字频率合成技术产生信号源，信号经过前级放大和滤波后输入到高压运放电路驱动压电陶瓷。分析了大功率驱动电源的散热问题，指出驱动电源散热片到空气的最大热阻为1.1℃／W。实验结果表明，当负载为10 nf时，驱动电源在10～300 kHz的频带范围内能够实现100Vp－p的放大输出，基本满足超声导波压电激振器的驱动要求。