Piezotransformer with ring-dot-shape for easy heat radiation and high efficiency power

Power of piezoelectric transformer was also limited for higher power application, therefore structures with multilayer and various shapes were researched to increase the output power and decrease heat distribution, but existing problems such as complicated manufacturing process and mechanical durability. A model of ring-dot-shape structure piezoelectric transformer for easy thermal radiation was investigated in this paper. The temperature distribution at the center was improved on the ring-dot-shape piezoelectric transformer, therefore increasing the output power efficiency. The ring-dot-shape transformer model was simulated and investigated successfully by applying a 1 KM in ATILA software, then a satisfied structure was fabricated, examined and compared to the results of the simulation. Electrical characteristics including input voltage, resonance frequency and output power were measured. Moreover, temperature distribution for thermal radiation was monitored by using an infrared camera. The piezoelectric transformer operated at first radial vibration mode and frequency area of 70 kHz. The 16 W output power was achieved under the driving voltage of 115 V, the matching load of 100 Ω, the size of 28 × 28 × 1.8 mm and 2 mm hole-diameter. With these multilayer piezoelectric transformers, the temperature was concentrated around the hole, and lower than piezoelectric transformers without a hole. On the thermal radiation, respectively, temperature distribution of piezo transformer was 41.4°C and without 51.9°C, thus the thermal distribution was decreased by 10.5°C in the ring-dot-shape structure. Also the efficiency was 95%.