Intelligent half-bridge sine wave voltage conversion circuit based on PFC interleaved flyback

Abstract

The invention discloses an intelligent half-bridge sine wave voltage conversion circuit based on PFC interleaved flyback, which comprises an input rectifier filter unit, a PFC boost unit, an interleaved flyback isolation conversion unit, a DC filter unit and an inverter phase inversion unit, wherein the interleaved flyback isolation conversion unit comprises a first switch transistor, a second switch transistor, a first transformer, a second transformer, a first diode, a second diode, a third diode and a fourth diode; the DC filter unit comprises a first capacitor and a second capacitor, the cathode of the third diode is connected with the back-end ground through the first capacitor, and the anode of the fourth diode is connected with the back-end ground through the second capacitor; and the inverter phase inversion unit comprises a fourth switch transistor, a fifth switch transistor, a third electrolytic capacitor, a fourth electrolytic capacitor and a filter inductor, and the back end of the filter inductor and the negative electrode of the third electrolytic capacitor serve as output ends of the inverter phase inversion unit. the filter inductor can be used for filtering high-frequency pulses, load can acquire excellent power frequency sine wave AC, and the circuit cost is reduced at the same time.

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 interleaved flyback. 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. Especially in the voltage conversion process, more ripple interference will be generated, which will affect the voltage quality. In addition, the existing sine wave voltage conversion circuit has defects such as complex circuit structure, slow respon...

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.

Especially in the process of voltage conversion, more ripple interference will be generated, which will affect the voltage quality

In addition, the existing sine wave voltage conversion circuit has defects such as complex circuit structure, slow response speed, and high cost.

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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