【摘要】 针对声波测井压电陶瓷换能器容性大的负载特性,采用单片机和CPLD相结合的方式设计了一种输出幅度高、驱动电流大、脉冲宽度可调的双通道高压脉冲信号源。系统利用C8051F350单片机及PWM控制芯片MM33060A,并结合自耦变压器反激式升压电路将12 V直流供电电压抬升至300 V。采用CPLD产生精确的频率可控的300 V脉冲电压,利用脉冲变压器进一步提升电压,得到了上千伏的高压激励脉冲。实验结果标明,设计的信号源在激励压电陶瓷换能器时,负载上得到了比较理想的波形,波形上升沿陡峭,无拖尾及振荡现象,满足实际应用需求。更多还原

【Abstract】 A kind of dual channel high- voltage pulse generator based on CPLD was designed in order to solve the problem of large capacitive loads characteristic with transducer used in acoustic well-logging. MCU and CPLD were used in this design. This kind of generator can provide high amplitude,strong ability of current driving and the pulse width can be adjusted. C8051F350 MCU,PWM control chip MM33060 A and fly- back type circuit were used to get voltage uplift from 12 V to 300 V. Using CPLD to produce precise frequency and pulse width control signal,high- voltage pulse generating circuit outputted 300 V pulse voltage. 1 kV pulse signals were achieved on the secondary side of the transformer.The experimental results indicated that we can get ideal wave form the piezoelectric ceramic transducer. It has a steep rising and no tailing or oscillation. Therefore,this kind of generator meets the needs of practical application.更多还原