【摘要】：針對超聲波電源工作時負(fù)載狀態(tài)改變,換能系統(tǒng)產(chǎn)生諧振漂移的問題,提出了一種基于STM32的頻率自動跟蹤超聲波電源的設(shè)計。電源逆變電路采用帶輔助網(wǎng)絡(luò)的全橋結(jié)構(gòu),阻抗匹配電路選擇了一種改進(jìn)型的T型匹配網(wǎng)絡(luò),應(yīng)用PWM移相調(diào)功技術(shù)控制電源的輸出功率,通過數(shù)字鑒相技術(shù)得到電壓電流的相位差作為電路諧振狀態(tài)的反饋信號,結(jié)合STM32主控制器進(jìn)行PI控制,調(diào)節(jié)PWM波的輸出頻率使電路始終工作于諧振狀態(tài),實(shí)現(xiàn)了諧振頻率的自動跟蹤。最后基于該設(shè)計方案,實(shí)際制作了一款應(yīng)用于超聲波清洗儀的電源,并通過實(shí)驗(yàn)驗(yàn)證了該電源具有輸出功率穩(wěn)定,負(fù)載適應(yīng)性強(qiáng),輸出頻率自動跟蹤等特點(diǎn)。
[Abstract]:Aiming at the problem that the load state of ultrasonic power supply changes and the resonant drift occurs in the energy transfer system, a design of frequency automatic tracking ultrasonic power supply based on STM32 is proposed. The power inverter adopts a full-bridge structure with auxiliary network, and the impedance matching circuit selects an improved T-type matching network. The output power of the power supply is controlled by PWM phase-shift power modulation technology. The phase difference of voltage and current is used as the feedback signal of the resonant state of the circuit by digital phase detection technique. The PI control is carried out by combining with the STM32 master controller, and the output frequency of the PWM wave is adjusted so that the circuit always works in the resonant state. The automatic tracking of resonant frequency is realized. Finally, based on the design scheme, a practical power supply for ultrasonic cleaning instrument is made, and it is verified by experiments that the power supply has the characteristics of stable output power, strong load adaptability and automatic tracking of output frequency.
【作者單位】： 青島科技大學(xué)自動化與電子工程學(xué)院;
【基金】：山東省高等學(xué)�？萍加媱濏�(xiàng)目(J15LN39) 山東省自然科學(xué)基金(ZR2015FL008)
【分類號】：TM46

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