Class D amplifier for a power piezoelectric load

Agbossou, Kodjo; Dion, Jeremy; Carignan, S.; Abdelkrim, Mohamed Naceur; Chériti, A.

doi:10.1109/58.852087

Cited by 75 publications

(43 citation statements)

References 4 publications

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“…The current feedback circuitry consists of the necessary sensing and signal conditioning circuits required for closed loop control. The power controller also functions as a protection system for the voltage multiplier output stage, allowing the maximum current level and multiplier peak switching voltage to be set independently [6].…”

Section: Methodsmentioning

confidence: 99%

Energy Efficiency Model for Induction Furnace

Dey¹

2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. In this paper, a system of a solar induction furnace unit was design to find out a new solution for the existing AC power consuming heating process through Supervisory control and data acquisition system. This unit can be connected directly to the DC system without any internal conversion inside the device. The performance of the new system solution is compared with the existing one in terms of power consumption and losses. This work also investigated energy save, system improvement, process control model in a foundry induction furnace heating framework corresponding to PV solar power supply. The results are analysed for long run in terms of saving energy and integrated process system. The data acquisition system base solar foundry plant is an extremely multifaceted system that can be run over an almost innumerable range of operating conditions, each characterized by specific energy consumption. Determining ideal operating conditions is a key challenge that requires the involvement of the latest automation technologies, each one contributing to allow not only the acquisition, processing, storage, retrieval and visualization of data, but also the implementation of automatic control strategies that can expand the achievement envelope in terms of melting process, safety and energy efficiency.

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Section: Methodsmentioning

confidence: 99%

Energy Efficiency Model for Induction Furnace

Dey¹

2018

IOP Conf. Ser.: Mater. Sci. Eng.

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“…The values of frequency and current are reference for the impedance control block operation. In this step the transducer is supplied by a full bridge of MOSFETs, such as suggested by Agbossou (Agbossou et al 2000). The central branch of this bridge is constituted by two 2 nd order Butterworth filters, the transducer and the current sensor (LA25NP-SP14 -LEM Co.).…”

Section: Impedance Controllermentioning

confidence: 99%

A Driver for Piezoelectric Transducers with Control of Resonance

et al. 2015

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Variations in electric impedance curves of piezoeletric transducers occur under influence of mechanical load, temperature, electric excitation, among others. Electronic circuits for driving these transducers should correct the tune to maintain the performance of the transducer. Considering the changes at resonance, we have developed a circuit for a laboratory bench that performs two functions. The first, working on low power, by swapping frequencies around resonance, allows to the user define electric impedance and frequency operation that intend to apply in the experiment. The operation of this circuit is based on detection of magnitude of current in the transducer. A microcontroller and Labview are used to obtain the results. In the second, while under high power operation, deviations from original impedance are corrected by using a feedback network that evaluates amplitude of impedance. In this circuit, a class D MOSFET amplifier is used for exciting the transducer. Also, a microcontroller system controls the feedback network. Experiments with variation of mechanical loads have shown the effectiveness of the system.

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“…Among different excitation methods introduced in [23,24], generating a sinusoidal signal with low distortion is an appropriate option.…”

Section: 2using a Sinusoidal Signalmentioning

confidence: 99%

Dissimilar trend of nonlinearity in ultrasound transducers and systems at resonance and non-resonance frequencies

et al. 2017

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Abstract-Several factors can affect performance of an ultrasound system such as quality of excitation signal and ultrasound transducer behaviour. Nonlinearity of piezoelectric ultrasound transducers is a key determinant in designing a proper driving power supply. Although, the nonlinearity of piezoelectric transducer impedance has been discussed in different literatures, the trend of the nonlinearity at different frequencies with respect to excitation voltage variations has not been clearly investigated in practice. . In this paper, to demonstrate how the nonlinearity behaves, a sandwich piezoceramic transducer was excited at different frequencies. Different excitation signals were generated using a linear power amplifier and a multilevel converter within a range of 30 V-200V. Empirical relation was developed to express the resistance of the piezoelectric transducer as a nonlinear function of both excitation voltage and resonance frequency. The impedance measurements revealed that at higher voltage ranges, the piezoelectric transducer can be easily saturated. Also, it was shown that for the developed ultrasound system composed of two transducers (one transmitter and one receiver), the output voltage measured across receiver is a function of a voltage across the resistor in the RLC branches and is related to the resonance frequencies of the ultrasound transducer. Index TermsHigh power ultrasound transducer, nonlinear behaviour, ultrasound system excitation, power electronic converters Dissimilar trend of nonlinearity in ultrasound transducers and systems at resonance and non-resonance frequencies 2

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Class D amplifier for a power piezoelectric load

Cited by 75 publications

References 4 publications

Energy Efficiency Model for Induction Furnace

Energy Efficiency Model for Induction Furnace

A Driver for Piezoelectric Transducers with Control of Resonance

Dissimilar trend of nonlinearity in ultrasound transducers and systems at resonance and non-resonance frequencies

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