滴灌压电泵的驱动电源设计与试验研究

Design and experiment on driving power supply for drip irrigation piezoelectric pump

针对滴灌压电泵对驱动电源的要求,基于EG8010逆变器芯片,采用单相桥式电压型逆变与整流电路以及SPWM技术控制正弦波发生器芯片实现一种基于SPWM技术开关型电源驱动装置.首先提出了适用于滴灌压电泵的驱动电源结构和工作原理,通过相应控制调节电路,形成激励电压与频率连续可调的单相正弦波,从硬件上进行了输出电压反馈与调节电路、频率调节电路、温度监测电路的设计,以此作为滴灌压电泵激励源并进行了试验研究.结果表明:与信号发生器和功率放大器组成的传统驱动方式相比,该驱动电源拥有自带死区控制、稳定性强、波形失真小、结构简单、体积小、操作方便、成本低等优点,能够满足其对滴灌压电泵的驱动与控制等要求.

According to the requirement on driving power supply by a drip irrigation piezoelectric pump, a switch driving power supply is designed in this paper based on the EG8010 inverter chip by adopting single phase bridge voltage inverter, rectifier circuit and SPWM control sine wave generator chip. Firstly, the structure and working principle of driving power supply are proposed for drip irriga- tion piezoelectric pumps. Secondly, a single phase sine wave with continuously adjustable excitation voltage and frequency is formed by using the corresponding control regulation circuit. Then the output voltage feedback and regulation circuits, frequency control circuits and temperature monitor circuits are designed with hardware. At last, an experiment is carried out based on the single phase sine wave which will be used as an excitation source of drip irrigation piezoelectric pump. The results show that and it can meet the requirement on driving and control by a drip irrigation piezoelectric pump.