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

Abstract

The invention discloses a PFC flyback full-bridge-based intelligent sine-wave voltage conversion circuit, which comprises an input unit, a PFC booster unit, a flyback isolation converter unit and an inverse inverter unit, wherein the flyback isolation converter unit comprises a first switch tube, a transformer, a first rectifier diode, a filter inductor and a first filter capacitor; a first end of a primary winding of the transformer is connected to an output end of the PFC booster unit; a second end of the primary winding of the transformer is connected to a drain of the first switch tube; a source of the first switch tube is connected to front-end ground; a gate of the first switch tube is used for being connected to a PWM signal; the first end of a secondary winding of the transformer is connected to an anode of the first rectifier diode; a cathode of the first rectifier diode is connected to a front end of the filter inductor; a rear end of the filter inductor is taken as an output end of the flyback isolation converter unit; and the inverse inverter unit is used for outputting AC after inverse conversion. According to the PFC flyback full-bridge-based intelligent sine-wave voltage conversion circuit, the PF value can be improved and the quality of output voltage can be improved.

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 flyback 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 is the key circuit, and it is a circuit that can realize AC-AC conversion. In the AC-AC conversion, it can realize the functions of step-up and step-down and stabilize the 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. However, in the current voltage conversion circuit, it is usually necessary to use the PWM signal to cooperate with the control of the switch tube to realize the voltage conversion, which will cause certain high-frequency harmonics...

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.

However, in the current voltage conversion circuit, the voltage conversion is usually realized by means of the PWM signal and the control of the switch tube, which leads to certain high-frequency harmonics in the circuit. The existence of these high-frequency signals will affect the quality of the output voltage. , so it is difficult to meet the conversion requirements

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