Design of fixed frequency controlled radial-mode stacked disk-type piezoelectric transformers for DC/DC converter applications

Liu, Yuan-Ping; Vasić, Dejan; Costa, François; Wu, Wen-Jong; Lee, Chih‐Kung

doi:10.1088/0964-1726/18/8/085025

Cited by 23 publications

(24 citation statements)

References 19 publications

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“…It should be noted that the inductor is not necessary but adding it enlarges the range of zero voltage switching (ZVS) condition and rejects common mode noise [7]. Since the variable frequency methods haven't a sufficient control bandwidth for wide range load variations, the constant switching frequency has become a matter of interest in the previous researches [8]. Similarly, as for other resonant converters, the duty cycle variation may move the resonant conditions and the soft switching condition, which causes the efficiency of the converter to decrease.…”

Section: Presentation Of the Dc/dc Convertermentioning

confidence: 99%

Piezoelectric transformer-based DC/DC converter with improved burst-mode control

Vasić

Liu

Costa

et al. 2013

2013 IEEE Energy Conversion Congress and Exposition

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This paper proposed a new control strategy of piezoelectric transformer based DC-DC converter in burstmode operation. Burst-mode control is adopted for achieving output voltage regulation and for enabling the converter to operate at constant switching frequency as well as to keep a good efficiency at light load conditions. However, in practice, the piezoelectric transformer (PT) cannot stop instantly to vibrate due to its high quality factor. The delay in the output voltage change, resulting from this behavior influences the accuracy of the regulation. This paper proposes a control strategy to make the piezoelectric transformer can stop more quickly so as to enhance the accuracy of burst-mode control. The proposed method only modifies the control signal of the burst-mode driving circuit.

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Section: Presentation Of the Dc/dc Convertermentioning

confidence: 99%

Piezoelectric transformer-based DC/DC converter with improved burst-mode control

Vasić

Liu

Costa

et al. 2013

2013 IEEE Energy Conversion Congress and Exposition

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“…Y.P. Liu proposed a design method of PT in a DC/DC converter based on analyze of the vibration velocity [18][19][20]. By examining the constraints of the maximum mechanical current and the energy balance this method provides the dimensional dimension of the PT for a wide range of the load.…”

Section: Introductionmentioning

confidence: 99%

Design of piezoelectric transformer for DC/DC converter with stochastic optimization method

Vasić¹,

Vido

2016

SPIE Proceedings

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Piezoelectric transformers were adopted in recent year due to their many inherent advantages such as safety, no EMI problem, low housing profile, and high power density, etc. The characteristics of the piezoelectric transformers are well known when the load impedance is a pure resistor. However, when piezoelectric transformers are used in AC/DC or DC/DC converters, there are non-linear electronic circuits connected before and after the transformer. Consequently, the output load is variable and due to the output capacitance of the transformer the optimal working point change. This paper starts from modeling a piezoelectric transformer connected to a full wave rectifier in order to discuss the design constraints and configuration of the transformer. The optimization method adopted here use the MOPSO algorithm (Multiple Objective Particle Swarm Optimization). We start with the formulation of the objective function and constraints; then the results give different sizes of the transformer and the characteristics. In other word, this method is looking for a best size of the transformer for optimal efficiency condition that is suitable for variable load. Furthermore, the size and the efficiency are found to be a trade-off. This paper proposes the completed design procedure to find the minimum size of PT in need. The completed design procedure is discussed by a given specification. The PT derived from the proposed design procedure can guarantee both good efficiency and enough range for load variation.

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“…In other hand, to avoid an overdesign of power converters due to the switching losses a zero-voltage-switching (ZVS) technique can be introduced [21]. But, to achieve the ZVS condition, a bulky inductor or an inductive matching network is typically required in the driving circuit [22]. However, the added magnetic component sacrifices the size and the weight of the converter.…”

Section: Introductionmentioning

confidence: 99%

Energy recovery power supply for piezoelectric actuator

Vasić

Costa

2014

IECON 2014 - 40th Annual Conference of the IEEE Industrial Electronics Society

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Abstract-Piezoelectric actuators are used successfully to enable locomotion of micro-robot such as micro air vehicle with flapping wings. However, the use of piezoelectric actuators presents a major challenge for power electronic design: the input capacitance of such devices makes their use delicate because the instantaneous power may be much greater than the average effective power. Due to this challenge, conventional drive circuits, especially inductor, become too bulky or inefficient in low mass applications. This work describes a converter suitable to drive this kind of actuators with low inductor. Moreover the converter provides for recovery of the energy stored on the actuator capacitance back to the primary power supply when the actuator is not supply. The proposed converter is a DC/AC structure, which is capable of producing a square unipolar AC voltage. In our design, an auxiliary shunt circuits are connected to the actuator. Signal flow graph modeling, analysis and design of such a scheme is presented. Experimental validations have demonstrated the effectiveness of the proposed technique for recovery energy.

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Design of fixed frequency controlled radial-mode stacked disk-type piezoelectric transformers for DC/DC converter applications

Cited by 23 publications

References 19 publications

Piezoelectric transformer-based DC/DC converter with improved burst-mode control

Piezoelectric transformer-based DC/DC converter with improved burst-mode control

Design of piezoelectric transformer for DC/DC converter with stochastic optimization method

Energy recovery power supply for piezoelectric actuator

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