Electronic ballast applying piezoelectric ceramic transformer

Abstract

The invention provides an electronic ballast applying a piezoelectric ceramic transformer, comprising a square wave pulsed voltage generating circuit, the piezoelectric ceramic transformer and a regulating transformer, wherein, the regulating transformer is connected between the output end of the square wave pulsed voltage generating circuit and the input end of the piezoelectric ceramic transformer, back-stage voltage amplitude and phase can be changed by adjusting the transformer, and the working pressure point of the piezoelectric ceramic transformer is adjusted to ensure that the whole circuit works under the inductive state. The invention can greatly enlarge the frequency range of the piezoelectric ceramic transformer when the piezoelectric ceramic transformer works under the inductive state, thus ensuring that the whole circuit still works under the inductive state in the condition of fluorescent lamp load impedance change so as to prevent the resonance circuit from losing stability.

Description

Technical field [0001] The invention relates to an electronic ballast, in particular to a high-reliability electronic ballast using a piezoelectric ceramic transformer. Background technique [0002] With the gradual maturity of the piezoelectric ceramic transformer technology and the gradual decrease in cost, the piezoelectric ceramic transformer will be more widely used in many suitable fields. Piezoelectric ceramic transformers have many advantages that traditional transformers do not have. In the field of electronic ballasts for fluorescent lamps, it is undoubtedly very suitable for piezoelectric ceramic transformer applications. Therefore, a comprehensive and in-depth study of the application of piezoelectric ceramic transformers in the field of electronic ballasts is very necessary. [0003] The piezoelectric ceramic transformer is applied to the traditional LC resonant circuit as attached figure 1 Shown. It mainly includes the driver chip, MOS transistors Q1, Q2, inductor ...

AI Technical Summary

Problems solved by technology

After preheating and lighting, the impedance changes greatly. It is difficult to ensure that the circuit works in an inductive state when the load impedance of the fluorescent lamp changes by using a traditional circuit. Once the circuit works in a capacitive state, the resonant circuit will lose stability or even be damaged. destroy

[0006] 2. Even if the appropriate circuit parameters can be found so tha

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