High-frequency boosting isolation inverter

Abstract

The invention discloses a high-frequency boosting isolation inverter, which comprises a high-frequency boosting inverting circuit and an AC-AC (alternating current-alternating current) conversion circuit. The high-frequency boosting inverting circuit is mainly used for outputting the single-phase AC voltage, and realizing the low ripple of input current by controlling the phase of the main switch tube via a staggered parallel connecting structure. Meanwhile, the high-frequency boosting inverting circuit adopts an active clamp structure to realize soft opening and closing of the main switch tube, so the consumption is reduced and the efficiency is improved. In addition, the high-frequency boosting inverting circuit adopts two coupled induction type serial connecting structures at the load side to realize higher boosting capability. The single-phase AC voltage is converted into the three-phase AC current by the AC-AC conversion circuit, and the energy transmission process is divided into a capacitance side charging part and a capacitance side discharging part for the output end. Therefore, the isolation inverter can obtain higher voltage gain and lower input current ripple, and the conversion efficiency and the reliability are high.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a high-frequency step-up isolation inverter. Background technique [0002] The traditional DC-AC inverter needs to go through a bridge circuit, such as figure 1 Shown; This kind of bridge inverter because of the poor performance of the body diode of the switching tube, it causes a lot of loss and limits the improvement of the switching frequency. At the same time, the bridge circuit also has the danger of direct connection between the upper and lower power tubes of the same bridge arm. In order to overcome this danger, a double Buck inverter and a current source inverter are respectively proposed. [0003] Dual Buck inverters such as figure 2 As shown, it consists of two Buck circuits. Due to the existence of two inductors, it overcomes the direct problem of the traditional bridge-type inverter bridge and does not need to set the dead time. In addition, ...

AI Technical Summary

Problems solved by technology

However, the double Buck inverter has the following disadvantages: the voltage stress of the power tube is twice that of the output voltage, and its voltage utilization rate is low; the output voltage waveform of the bridge arm is bipolar, and the harmonic content is large

But the disadvantage of this circuit is that the switch tube has to bear the voltage stress of 3 to 5 times the DC bus, the input voltage of the DC side is limited, and the energy transmission of the circuit is limited.

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