PFC dual-full-bridge-based intelligent sine wave voltage conversion circuit

Abstract

The invention discloses a PFC dual-full-bridge-based intelligent sine wave voltage conversion circuit. The intelligent sine wave voltage conversion circuit comprises an input rectifying and filtering unit, a PFC voltage boosting unit, a full-bridge DC-to-DC isolation converter unit, an inversion phase reversal unit and a filtering inductor, wherein the full-bridge DC-to-DC isolation converter unit comprises a first switching tube, a second switching tube, a transformer, a first rectifying bridge, an eighth switching tube, a ninth switching tube and a first electrolytic capacitor; the inversion phase reversal unit is connected to the output end of the full-bridge DC-to-DC isolation converter unit for performing inversion conversion on the output voltage of the full-bridge DC-to-DC isolation converter unit and then outputting an alternating current; the front end of the filtering inductor is connected to the output end of the inversion phase reversal unit while the back end of the filtering inductor is connected with a load; and the filtering inductor is used for filtering high-frequency pulse and providing power frequency sine alternating current for the load. By adoption of the PFC dual-full-bridge-based intelligent sine wave voltage conversion circuit, the output voltage quality can be improved, and the high-frequency pulse in the output signal can be filtered.

Description

technical field [0001] The invention relates to a voltage conversion circuit, in particular to an intelligent sine wave voltage conversion circuit based on a PFC double full bridge. 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 sine wave voltage conversion circuit topology is its key circuit, which is a circuit that can realize AC-AC conversion. , can realize the function of buck-boost and stabilize voltage and frequency in AC-AC conversion. 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 ou...

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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