Design of Fluorescent Lamp Ballast With PFC Using a Power Piezoelectric Transformer

Choi, Sung-Jin; Lee, Kyu-Chan; Cho, Bo Hyung

doi:10.1109/tie.2005.858726

Cited by 59 publications

(14 citation statements)

References 13 publications

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“…2. For the parameters, R is an electrical component of the instinctive mechanical loss, C is an electrical component of the equivalent stiffness, L is an electrical component of the equivalent mass, C d1 is an input static capacitance, C d2 is an output static capacitance, and n is an equivalent electromechanical transformer turns ratio [3]. As seen in Fig.…”

Section: B Equivalent Circuit and Its Parametersmentioning

confidence: 99%

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Effects of a parallel resistor on electrical characteristics of a piezoelectric transformer in open-circuit transient state

Chang

2007

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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This paper investigates electrical transient characteristics of a Rosen-type piezoelectric transformer (PT), including maximum voltages, time constants, energy losses and average powers, and their improvements immediately after turning OFF. A parallel resistor connected to both input terminals of the PT is needed to improve the transient characteristics. An equivalent circuit for the PT is first given. Then, an open-circuit voltage, involving a direct current (DC) component and an alternating current (AC) component, and its related energy losses are derived from the equivalent circuit with initial conditions. Moreover, an AC power control system, including a DC-to-AC resonant inverter, a control switch and electronic instruments, is constructed to determine the electrical characteristics of the OFF transient state. Furthermore, the effects of the parallel resistor on the transient characteristics at different parallel resistances are measured. The advantages of adding the parallel resistor also are discussed. From the measured results, the DC time constant is greatly decreased from 9 to 0.04 ms by a 10 kΩ parallel resistance under open output.

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Section: B Equivalent Circuit and Its Parametersmentioning

confidence: 99%

“…For the electrical analysis of PTs and its experimental checking, a PT with a large step-up voltage gain acts as a key component of a DC-to-AC converter that generates a high AC voltage for either igniting or lighting a CCFL of a LCD [1]- [3]. The PT acts as a key component of a compact AC-to-DC adopter or DC-to-DC converter [4]- [6].…”

Section: Introductionmentioning

confidence: 99%

Effects of a parallel resistor on electrical characteristics of a piezoelectric transformer in open-circuit transient state

Chang

2007

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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“…They are Rosen type, Thickness vibration mode, and Radial vibration mode (Transoner) [2][3][4][5]. Recently, the circular unipoled ring/dot type has been focused with increasing interest, because it is easy to fabricate and pole [6][7][8][9]. But there is little information available on this type of PT.…”

Section: Introductionmentioning

confidence: 99%

Effects of Thickness and Input/Output Area Ratio on Electrical Characteristics of Circular Ring/Dot Type Piezoelectric Transformer

Srilomsak

Putthongchai

Pitiket

et al. 2011

Integrated Ferroelectrics

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Many types of piezoelectric transformer (PT) have been developed for more than 50 years. In this research, the voltage gain (V-gain) from circular ring/dot type PTs which have 2-3 mm thicknesses and 1-7 input/output area ratios (i/o area) was investigated under the criteria of 10 4 -10 6 Hz input voltage (V in ) and 500-100,00 connected load resistance (R L ). Results showed that 1) The maximum V-gain was located near its 1st resonance frequency measured on input electrode, 2) The V-gain was significantly increased with i/o area and R L . 3) Large V-gain was obtained in high i/o area PT connected to large enough load resistance.

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“…Some of the most common control methods are phase lock loop (PLL) [23]- [27] and resonance current control [28], but self-tuned control has also been proposed [29]. In this study, a new FCM control method is proposed and relies on a detection of the forward conduction period of the half-bridge switches, which reflects the resonance current phase lag.…”

mentioning

confidence: 99%

“…In PT-based converters, several single-stage charge-pump topologies offer PFC [28], [30]- [33], but have demanding requirements for the PT. In this approach, PFC is obtained simply by having a sufficiently small input buffer capacitor, allowing the half-bridge supply voltage to be modulated by the 100-Hz rectified ac mains voltage.…”

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confidence: 99%

Forward Conduction Mode Controlled Piezoelectric Transformer-Based PFC LED Drive

Roedgaard

Weirich²,

Andersen

2013

IEEE Trans. Power Electron.

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Abstract-Light-emitting diode (LED) illumination is getting more and more common; as LED's performance is rising, the price is falling and is getting competitive. Some of the challenges of ac mains supplied illumination are the requirement of power factor correction (PFC) and the competitiveness of a low priced market. In this paper, a new forward conduction mode (FCM) control method for piezoelectric transformer (PT)-based power converters is proposed. A PT-based LED drive facilitating passive PFC is developed, utilizing and validating the FCM control method. The drive utilizes an inductorless half-bridge topology and for circuit minimization and simplicity it has no load regulation and has a 100-Hz output modulation. The proposed FCM control method ensures that the PT is operated at its optimal operation frequency, which ensures soft-switching operation and a constant gain. As a result a 6.5-W PT-based PFC LED drive has been developed, supplied from 230-V 50-Hz ac mains, achieving a power factor of 0.96. Index Terms-Forward conduction mode (FCD) control, lightemitting diode (LED), power factor correction (PFC), piezoelectric transformer (PT).

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Design of Fluorescent Lamp Ballast With PFC Using a Power Piezoelectric Transformer

Cited by 59 publications

References 13 publications

Effects of a parallel resistor on electrical characteristics of a piezoelectric transformer in open-circuit transient state

Effects of a parallel resistor on electrical characteristics of a piezoelectric transformer in open-circuit transient state

Effects of Thickness and Input/Output Area Ratio on Electrical Characteristics of Circular Ring/Dot Type Piezoelectric Transformer

Forward Conduction Mode Controlled Piezoelectric Transformer-Based PFC LED Drive

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