Intelligent half-bridge sine-wave voltage switching circuit based on PFC and LLC resonance

Abstract

The invention discloses an intelligent half-bridge sine-wave voltage switching circuit based on PFC and LLC resonance. The intelligent half-bridge sine-wave voltage switching circuit comprises an input unit, a filter unit, a PFC booster unit, an LLC isolation transformer unit and an inverting reverse-phase unit, wherein the LLC isolation transformer unit comprises a first switching tube, a second switching tube, a transformer, a first diode, a second diode and a first filter inductor, the inverting reverse-phase unit comprises a fourth switching tube, a fifth switching tube, a third electrolytic capacitor, a fourth electrolytic capacitor and a second filter inductor, a source electrode of the fourth switching tube is connected to a drain electrode of the fifth switching tube, a positive electrode of the third electrolytic capacitor is connected to a drain electrode of the fourth switching tube, a negative electrode of the third electrolytic capacitor is further connected to a positive electrode of the fourth electrolytic capacitor, and the source electrode of the fourth switching tube is connected to the front end of the second filter inductor. The intelligent half-bridge sine-wave voltage switching circuit can improve a PF value and output voltage quality.

Description

technical field [0001] The invention relates to a voltage conversion circuit, in particular to an intelligent half-bridge sine wave voltage conversion circuit based on PFC and LLC resonance. Background technique [0002] In the prior art, the intelligent buck-boost conversion device from AC to AC is also called a travel plug-in strip. In this device, the voltage conversion circuit is the key circuit, which is a circuit that can realize AC-AC conversion. In the AC-AC conversion, the function of realizing buck-boost and stabilizing voltage and frequency. However, most of the current AC-AC portable equipment market is a non-isolated topology circuit with low PF value, low output voltage quality, and poor safety and reliability. In practical applications, due to the high-speed switching of the switching tube during the voltage conversion process, there will be a certain high-frequency pulse signal on the output side of the circuit, which will affect the quality of the output vo...

AI Technical Summary

Problems solved by technology

However, most of the current AC-AC portable equipment market is a non-isolated topology circuit with low PF value, low output voltage quality, and poor safety and reliability.

In practical applications, due to the high-speed switching of the switching tube during the voltage conversion process, there will be a certain high-frequency pulse signal on the output side of the circuit, which will affect the quality of the output voltage, so it is difficult to meet the conversion requirements

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