Single-Switch High-Power-Factor Inverter Driving Piezoelectric Ceramic Transducer for Ultrasonic Cleaner

Ultrasonic power transfer is a promising alternative to electromagnetic induction for providing wireless power to active implanted medical devices. In a portable ultrasonic power link for devices like cochlear implants, there is a key requirement for an inverter circuit that is capable of driving the transmitting piezoelectric transducer with high efficiency in order to maximize battery life and overall device reliability. In the following paper, a high efficiency Class E amplifier is presented for use on the transmit side of an ultrasonic transcutaneous energy transfer (UTET) link. The amplifier is characterized by a peak efficiency of 90.8% at an output power level of 293 mW and drive frequency of 1.275 MHz.

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“…In these cases, capacitor C3 should be sized accordingly given the parallel combination of C3 and the static transducer capacitance [6].…”

Section: Class E Amplifiersmentioning

confidence: 99%

Class E RF amplifier design in an ultrasonic link for wireless power delivery to implanted medical devices

Vihvelin

Leadbetter

Bance

et al. 2015

2015 IEEE 28th Canadian Conference on Electrical and Computer Engineering (CCECE)

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“…This frequency range would be narrow around f p . The theoretical ZVS frequency range could be derived from (13). For f n < 1 in Fig.…”

Section: Ideal Zvs Frequency Rangementioning

confidence: 99%

“…Thus, heat sinks are needed for transistors, and the characteristics of the PT may change due to temperature rise. To compensate for the capacitive behavior of the PT, additional reactive components are connected [4]- [7], [11]- [13], and some soft-switch technologies have been developed [7]- [9]. However, additional components should be highly dependent on the characteristic frequencies of the PT, and tracing the operating frequency from phase detection might become difficult due to additional harmonic currents introduced by additional components.…”

Section: Introductionmentioning

confidence: 99%

A Resonance-Frequency-Tracing Method for a Current-Fed Piezoelectric Transducer

Cheng

Kang

Chen

2014

IEEE Trans. Ind. Electron.

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This paper presents a novel control method for a current-fed full-bridge inverter actuating an ultrasonic piezoelectric transducer (PT). In the conventional ultrasonic detection system, the PT has maximum transmitting gain at its series resonance frequency while having maximum receiving gain at its parallel resonance frequency. With the proposed approach, the PT could have maximum transmitting gain at the parallel resonance frequency and this frequency can be automatically traced, and hence adapted, to the environmental variation. A prototype circuit was constructed to verify the proposed control method. The experimental results show that the receiving voltage signal could have a maximum value at the parallel resonance frequency, and the traced frequency is 0.04 kHz higher than the parallel resonance frequency.Index Terms-Current-fed inverter, piezoelectric transducer (PT), resonance frequency tracing, ultrasonic transducer. 0278-0046

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“…ITH the emergence of piezoelectric transducer (PT), it is being widely applied to several industry applications, including plastic welding, ultrasonic cleaner, atomizer, and so on [1][2]. Because the merits of this device, the necessity of employing PT in the inverter circuit becomes more significant than ever.…”

Section: Introductionmentioning

confidence: 99%

Application of hybrid-loop control approach to inverter design with piezoelectric transducers

Huang

Lee

Chen

et al. 2015

2015 IEEE International Conference on Industrial Technology (ICIT)

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A hybrid-loop control approach applied to inverter circuit design with piezoelectric transducers is proposed in this paper. This approach was motivated because the transducer is easily affected by the temperature effect and damping pressure, causing the mechanical frequency drift and unstable current variation. In view of these demerits, a hybrid-loop control mechanism is suggested to achieve both phase-tracking and constant-current control such that both operation frequency and vibration strength can be well controlled while maintaining a stable mechanical frequency. Moreover, by embedding this hybrid control concept into microprocessor controller units without adding any further sensors devices, the design cost is found to be meanwhile reduced. To validate the feasibility of this approach, the method has been validated through mathematical analysis and hardware realization. Test results confirm the performance improvement of the approach for piezoelectric transducer applications.

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Single-Switch High-Power-Factor Inverter Driving Piezoelectric Ceramic Transducer for Ultrasonic Cleaner

Cited by 33 publications

References 20 publications

Class E RF amplifier design in an ultrasonic link for wireless power delivery to implanted medical devices

Class E RF amplifier design in an ultrasonic link for wireless power delivery to implanted medical devices

A Resonance-Frequency-Tracing Method for a Current-Fed Piezoelectric Transducer

Application of hybrid-loop control approach to inverter design with piezoelectric transducers

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