Design of a Power Piezoelectric Transformer for a PFC Electronic Ballast

Huang, Weixing; Cogălniceanu, Dan; Baker, E.; Jing, Zhou; Hsieh, Hung‐I; Lee, F.C.

doi:10.1109/tie.2007.905630

Cited by 9 publications

(5 citation statements)

References 5 publications

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“…But the soft switching requirements of the PT for a bit more advance topologies, like the fullbridge, are the same. However for the more advanced topologies, like the PFC charge pump topologies [7], the requirements to the soft switching capability of the PT are higher, as the apparent parasitic input capacitance is increased.…”

Section: Piezoelectric Transformermentioning

confidence: 99%

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Empiric analysis of zero voltage switching in piezoelectric transformer based resonant converters

Rødgaard¹,

Andersen²,

Andersen³

2012

6th IET International Conference on Power Electronics, Machines and Drives (PEMD 2012)

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Research and development within piezoelectric transformer (PT) based converters are rapidly increasing, as the technology is maturing and starts to prove its capabilities. High power density and high efficiencies are reported and recently several inductor-less converters have emerged, which demonstrates soft switching capabilities. The elimination of a bulky inductor, reduces size and price of the converter, but demands a soft switching optimised PT. Several attempts of expressing the soft switching capability have been made [5][12], with some shortcomings. The goal of this paper is to derive a simple expression of the maximal obtainable soft switching capability (ZVS factor), for a specific PT design, assuming a matched load. The expression has been derived through series of parametric sweep simulations of the inductor-less halfbridge topology, which revealed that a linearization of the maximal soft switching capability can be performed, in the area of interest. This expression is intended to form a basic tool for development of soft switching optimised PT's, which enables the utilisation of inductor-less topologies.

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Section: Piezoelectric Transformermentioning

confidence: 99%

“…Piezoelectric transformer (PT) based converters have been around for some time now, but within resent years PT based converters have emerged, that exploit an inductor-less topology [1][2] [7][10] [13]. The elimination of the bulky inductor reduces size and price of the converter.…”

Section: Introductionmentioning

confidence: 99%

Empiric analysis of zero voltage switching in piezoelectric transformer based resonant converters

Rødgaard¹,

Andersen²,

Andersen³

2012

6th IET International Conference on Power Electronics, Machines and Drives (PEMD 2012)

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“…The input impedance value of the class-DE rectifier is obtained by solving (7) - (10). The resulting value is = 10.9 -j4.8 Ω.…”

Section: A the Pfc Semi-stage Designmentioning

confidence: 99%

Single-Stage High-Power-Factor Electronic Ballast with a Symmetrical Class-DE Resonant Rectifier

Ekkaravarodome¹,

Jirasereeamornkul²

2012

Journal of Power Electronics

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This paper presents the use of a novel, single-stage high-power-factor electronic ballast with a symmetrical class-DE low-dυ/dt resonant rectifier as a power-factor corrector for fluorescent lamps. The power-factor correction is achieved by using a bridge rectifier to utilize the function of a symmetrical class-DE resonant rectifier. By employing this topology, the peak and ripple values of the input current are reduced, allowing for a reduced filter inductor volume of the EMI filter. Since the conduction angle of the bridge rectifier diode current was increased, a low-line current harmonic and a power factor near unity can be obtained. A prototype ballast, operating at an 84-kHz fixed frequency and a 220-V rms , 50-Hz line input voltage, was utilized to drive a T8-36W fluorescent lamp. Experimental results are presented which verify the theoretical analysis.

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“…Piezoelectric transducers are widely used as emitters, sensors, resonators, filters and actuators in many fields to convert electrical and mechanical energy, such as piezoelectric motors, piezoelectric transformers, ultrasonic cleaning and welding, etc. [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 ]. The piezoelectric transducer can be regarded as a two-port network.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Matching Circuit on the Electromechanical Characteristics of Sandwiched Piezoelectric Transducers

Lin

2017

Sensors

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The input electrical impedance behaves as a capacitive when a piezoelectric transducer is excited near its resonance frequency. In order to increase the energy transmission efficiency, a series or parallel inductor should be used to compensate the capacitive impedance of the piezoelectric transducer. In this paper, the effect of the series matching inductor on the electromechanical characteristics of the piezoelectric transducer is analyzed. The dependency of the resonance/anti-resonance frequency, the effective electromechanical coupling coefficient, the electrical quality factor and the electro-acoustical efficiency on the matching inductor is obtained. It is shown that apart from compensating the capacitive impedance of the piezoelectric transducer, the series matching inductor can also change the electromechanical characteristics of the piezoelectric transducer. When series matching inductor is increased, the resonance frequency is decreased and the anti-resonance unchanged; the effective electromechanical coupling coefficient is increased. For the electrical quality factor and the electroacoustic efficiency, the dependency on the matching inductor is different when the transducer is operated at the resonance and the anti-resonance frequency. The electromechanical characteristics of the piezoelectric transducer with series matching inductor are measured. It is shown that the theoretically predicted relationship between the electromechanical characteristics and the series matching inductor is in good agreement with the experimental results.

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Design of a Power Piezoelectric Transformer for a PFC Electronic Ballast

Cited by 9 publications

References 5 publications

Empiric analysis of zero voltage switching in piezoelectric transformer based resonant converters

Empiric analysis of zero voltage switching in piezoelectric transformer based resonant converters

Single-Stage High-Power-Factor Electronic Ballast with a Symmetrical Class-DE Resonant Rectifier

Effect of the Matching Circuit on the Electromechanical Characteristics of Sandwiched Piezoelectric Transducers

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