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this paper proposes a new method eliminating external effect from (load, temperature) variation on a Piezoelectric Transformer (PT) converter by utilizing the phase-locked loop (PLL) modulation technique. The PLL control scheme involves detecting phase difference between injected sinusoidal signal and demodulated terminal voltage of PT. Generally, frequency control method decreases the efficiency...
A current trend in power electronics is the integration of power supplies. In this field, electromagnetic transformers may be replaced by piezoelectric transformers (PT). In a PT, the input electrical energy is transferred to the output through a mechanical wave using the direct and converse effects of piezoelectric materials. It has been proved that PT exhibit suitable characteristic, good integration...
This paper proposes a new control approach for tracking the optimal operating frequency of a backlight inverter. First, a class E backlight module is introduced to simplify the backlight circuit and to raise the system efficiency. A piezoelectric transformer (PT) is used to drive the cold cathode fluorescent lamp (CCFL) to eliminate the drawbacks of a conventional transformer and to reduce the dimension...
Piezoelectric transformer (PT) is attractive to the low power converting applications with advantages of high efficiency, small size, low EMI and high power density. This paper discusses ZVS conditions for a phase-lock control PT DC/DC converter, and we regulate the output voltage with the second loop. A 15 V to 45 V DC/DC converter is implemented with discrete circuit. Finally we show the experimental...
A new method is proposed in this paper to eliminate the temperature effect on a piezoelectric transformer (PT) residing inside a half-bridge backlight module which utilizes the phase-locked loop (PLL) technique. The PT is adopted to drive a cold cathode fluorescent lamp (CCFL) to eliminate the downside of a conventional transformer and to reduce the dimension, particularly the thickness, of the backlight...
Maximum-efficiency tracking control applied in the backlight module is proposed in this paper. The backlight system incorporates a phase-locked loop as a feedback mechanism to promote both the system efficiency and stability. To overcome the drawbacks of the conventional electromagnetic transformer and miniaturize the backlight module, the piezoelectric transformer is adopted for driving the cold...
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