136188-02 | BENTLY NEVADA | Piezoelectric transformer power supply module

Description

136188-02 | BENTLY NEVADA | Piezoelectric transformer power supply module

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In high-frequency switching power supplies, the application of Piezo-e1ectric transformers (PET) in 136188-02 can achieve lightweight, small, thin, and high power density in switching power supplies. For example, in a DC/DC switching power supply, the PET in the DC/DC converter input is an active clamp ZVS inverter circuit, generating trapezoidal wave AC power, which is output to the rectification and filtering circuit through PET. It should be noted that PET does not fall within the scope of magnetic components.

A piezoelectric transformer utilizes the unique properties of voltage to vibration conversion and vibration to voltage conversion of piezoelectric ceramic materials to transfer electrical energy, and its equivalent circuit is like a series parallel resonant circuit. It is one of the research hotspots in the field of power conversion. The research content of 136188-02 includes: loss assessment of piezoelectric materials, PET design calculation methods, simulation, parameter analysis, finite element analysis, vibration speed limit, high-frequency performance of PET, etc. 50 W PET has been developed domestically. In high-frequency DC/DC converters, the application of PET has been reported, such as a 2 MHz DC/DC converter with an output of 24 W and 12 V (where the PET voltage ratio is 5:1), a mouth light power supply with an output of 2 W and 1200 V AC (PET voltage ratio is 1:20), a cold cathode fluorescent lamp and neon light inverter, etc. The piezoelectric transformer in the DC/DC converter is shown in the figure. Its input is an active clamp ZVS inverter circuit, which generates trapezoidal wave AC power and outputs a rectification and filtering circuit. The piezoelectric transformer is like a series parallel resonant circuit.

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