Self-phase-change driving method and apparatus for piezoelectric voltage transformer

Abstract

The invention provides a self-phase changing type driving method and a device for a piezoelectric transformer. The device at least comprises a piezoelectric transformer, a primary side voltage driving unit, an output electrode, an amplification control unit and a primary side current phase output unit. The driving mode adopts the phase of the primary side input current to reflect the real-time resonance frequency of the piezoelectric transformer, and amplifies the signal to generate a control driving signal so as to drive primary side input voltage and achieve the aim of the stable operation of the piezoelectric transformer. The method avoids the resonance frequency drift phenomenon caused by temperature or loads when the piezoelectric transformer drives at the driving frequency, and removes the trouble that the secondary side output capacity reduces greatly because the driving frequency is not identical with the resonance frequency of the piezoelectric transformer and the input impedance greatly increases. Meanwhile, the flexible switch result with zero current is realized naturally by switching voltage when the phase of the input current is switched, thereby reducing the switching loss of a driving assembly and improving the conversion frequency of the piezoelectric transformer so as to achieve the aim of saving energy.

Description

technical field [0001] The present invention provides a piezoelectric transformer driving method and device, especially a piezoelectric transformer self-commutation driving method with the primary side current phase of the piezoelectric transformer itself as a switching reference, and a method for switching voltage at zero current A driving method and an installer of a flexible switching driving method. Background technique [0002] In general, piezoelectric transformers change the step-up ratio (indicates the output voltage of the secondary side relative to the input voltage of the primary side) due to the resistance of the load connected to the secondary side, and the ratio of the output voltage of the secondary side to the primary side The driving efficiency represented by the output power on the secondary side of the input power also changes in the same way, so the driving frequency at which the maximum boost ratio and driving efficiency can be obtained also changes. Th...

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Problems solved by technology

[0005] 1. The number of parts used in the complex control circuit requires a relatively large circuit board space, so the cost is high

[0006] 2. Due to the large number of parts used, the stability of the circuit is relatively poor

[0009] 5. The signal selection switching circuit has a reference to the secondary side of the piezoelectric transformer, and the voltage on this secondary side is a relatively high high-voltage circuit, and there is a possibility that parts are broken through and interfered by high voltage, so attention must be paid to high voltage preventive measures and installation measures

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