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A zero-voltage-switching (ZVS) method utilizing high-order current harmonics for piezoelectric transformer (PT) backlight inverter is presented. In order to enhance the efficiency of PT backlight inverter, a large inductor is usually connected in series with PT for ZVS and filtering. Utilizing high-order current harmonics for ZVS can greatly reduce the required series inductance. The ZVS condition...
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...
An up to 5 Watts wide range power supply LED driver demonstrator with a piezoelectric transformer (PT) has been built to show the static and dynamic behavior as an off-line power supply. The target of the power converter controller using a PT, with 2.3 mm thickness and 17 mm diameter at frequency of 155-175 kHz, designed in a resonant circuit of class-E topology, is to maintain a constant output current...
An up to 5 Watts wide range power supply LED driver demonstrator with a piezoelectric transformer (PT) has been built to show the static and dynamic behavior as an off-line power supply. The target of the power converter controller using a PT, with 2.3 mm thickness and 17 mm diameter at frequency of 155-175 kHz, designed in a resonant circuit of class-E topology, is to maintain a constant output current...
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