中功率数字超声波电源研究与设计

Research and Design of Medium Power Digital Ultrasonic Power Supply

根据实际的需求设计了一款额定功率为2 000W的数字超声波电源。采用STM32F767作为该智能数字超声波电源的主控制器,完成整个电源的控制与处理。根据换能器的特性设计了一种LC串联型匹配电路,实现换能器的谐振匹配;根据阻抗匹配的要求设计了高频变压器,实现逆变器输出阻抗的匹配。为了解决在频率跟踪过程中,跟踪方向自动调节的难题,设计了一种方向自适应变步长频率跟踪算法,实现频率跟踪方向的自动调节;采用“开环+闭环”的复合功率控制算法对输出功率进行有效的调节。实际测试结果表明该智能数字超声波电源达到设计要求,且性能稳定。

According to the actual needs, a digital ultrasonic power supply with a rated power of 2000W was designed. STM32F767 was used as the main controller of the intelligent digital ultrasonic power supply to complete the control and processing of the entire power supply. According to the characteristics of the transducer, an LC series matching circuit was designed to realize the resonance matching of the transducer. According to the requirement of impedance matching, a high-frequency transformer was designed to realize the matching of the output impedance of the inverter. In order to solve the problem of automatic adjustment of the tracking direction in the process of frequency tracking, a direction adaptive variable-step frequency tracking algorithm was designed to realize the automatic adjustment of the frequency tracking direction. The composite power control algorithm of "open-loop + closed-loop" was utilized to effectively regulate the output power. Finally, the actual test results show that the intelligent digital ultrasonic power supply can meet the design requirements and has stable performance.