Design considerations of Piezoelectric transformers with voltage-mode rectifiers for DC/DC converter application

Liu, Yuan-Ping; Vasić, Dejan; Costa, François; Wu, Wen-Jong; Lee, C.K.

doi:10.1109/iecon.2008.4758033

Cited by 2 publications

(2 citation statements)

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“…The specifications of the converter studied in this paper are set as follows: the switching frequency is set at near 85 kHz, the input voltage is 30V, the output voltage is 15V, and the output power can vary from 1 to 10W. The regulation is made by hysteretic feedback; the efficiency is higher than 80% [7]. This paper can be separated into three parts.…”

Section: Introductionmentioning

confidence: 99%

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EMI analysis of a DC-DC converter using a piezoelectric transformer

Liu

Vasić

Costa

et al. 2009

2009 35th Annual Conference of IEEE Industrial Electronics

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Power electronic converters based on piezoelectric transformer (PT) have been widely adopted in recent years due to their many inherent advantages such as safety, low housing profile and high power density. However, few studies have been conducted about noises emitted by PT converters [1]. In this paper, we study conducted EMI problems in a 10W, DC-DC PT converter. The different sources and specific couplings of EMI in this structure will be presented. The experimental setup, which allowed us to study the various propagation ways and to measure the relevant impedances will be shown. A model which focuses on the parasitic impedances of the PT connected to the rectifier will be proposed. It will be shown that the EMI behaviour of a PT based converter is very different from usual power electronics, due to the PT structure and to its specific output working. Furthermore, the experimental validation of our model is discussed. Finally, we propose an improved configuration of the staked disk-type PT in the converter to reduce the common-mode noise. As a result, drastic noise reduction has been achieved.

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Section: Introductionmentioning

confidence: 99%

“…The main application of converters using PTs is to supply high voltage constant loads like cold cathode fluorescent lamps [4], [5], [6]. But recently, they are also used in low voltage DC/DC applications with variable load [7]. In this case the load impedance is a nonlinear rectifier.…”

Section: Introductionmentioning

confidence: 99%