lcc resonant high frequency sine wave power supply

Abstract

The invention relates to an LCC resonant high-frequency sine wave power supply, comprising an input rectification filter circuit, a BUCK switch circuit, a full-bridge switch circuit, an LCC resonant conversion, a transformer, and a voltage sampling circuit; the input rectification filter circuit, BUCK switch circuit, The full-bridge switching circuit, the LCC resonant conversion, and the transformer are connected in series in sequence, the input end of the voltage sampling circuit is connected to the output end of the transformer, the output end is connected to the control end of the BUCK switching circuit, and the input end of the input rectification and filtering circuit is used as a power supply The input terminal of the transformer serves as the output terminal of the power supply. The LCC resonant high-frequency sine wave power supply of the invention can generate high-frequency sine wave voltage with stable amplitude and small THD.

Description

technical field [0001] The invention belongs to the technical field of sine wave power supplies, in particular to an LCC resonant high-frequency sine wave power supply with good amplitude stability and low total harmonic distortion. . Background technique [0002] The sine wave power supply is a power supply that can output a sine wave voltage source with stable frequency and constant amplitude. The most widely used sine wave power supply includes inverter power supply, uninterrupted power supply (UPS-Uninterrupted Power Supply), etc. The sine wave power supply can also be widely used in eddy current heating devices, high-voltage strong current accelerators, high-voltage doubler towers, etc., but because the traditional sine wave power supply is generated using the SPWM (SPWM-SinusoidalPulseWidthModulation) control mode, it is necessary to generate high-quality For a sine wave power supply, the sampling frequency of the SPWM wave must be many times higher than the sine wave...

AI Technical Summary

Problems solved by technology

The method introduced in this article is a parallel resonant converter (PRC-ParallelResonantConverter). The PRC circuit is relatively simple, only the resonant inductor L, the resonant capacitor C, and the load resistor R connected in parallel to the resonant capacitor. However, due to the limitation of the topology, the PRC circuit produces The load characteristics of the sine wave power supply are not good, the overshoot is about 15% at no-load and full-load, and the THD is about 5% when outputting rated power. When the load changes, the gain of the loop and the distortion of the output waveform will change greatly, so it is not suitable for use in changing In the case of load, and the no-load loss is large

[0005] In short, the existing high-frequency sine wave power supply has the problems of poor amplitude stability and large total harmonic distortion (THD-TotalHarmonicDistortion)

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