Double step-down bridge type inverter controlling method for single current sensor

Abstract

The invention discloses a method for controlling a single current sensor double-decompression bridge-type inverter, which belongs to methods for controlling inverters. The invention adopts a single current sensor to collect inverter inductor current, and an output voltage outer ring receives an inverter output voltage feedback signal and an output voltage set signal, and outputs a set inductor current. An inductor current inner ring receives the set inductor current and the inductor current feedback signal, and outputs a logic control signal. The power switch tube drives a logic circuit to receive the logic control signal, the inductor current feedback signal and the output voltage feedback signal, and to output high and low level actuating signals of each power switch tube. The method only needs a current sensor, the cost is reduced, simultaneously, the volume and weight of a filter can be reduced through adopting the control method, and the efficiency of the inverter is improved.

Description

Technical field [0001] The invention relates to a control method of an inverter, in particular to a control method of a single current sensor double-buck bridge inverter. Background technique [0002] With the continuous shortage of fossil energy and the increasing environmental pollution, distributed power generation systems based on new energy and renewable energy have become a hot research topic, and inverters are an important part of them. Reliability is an important indicator to measure inverter performance. The dual step-down half-bridge inverter, because there is no through problem of the bridge arm power tube of the traditional bridge inverter, improves the reliability of the system. But it has the disadvantage of low input DC voltage utilization, that is, the highest output voltage of the bridge arm is only half of the input DC voltage. The dual-buck bridge inverter solves the problem of low input DC bus voltage utilization of the dual-buck half-bridge inverter. Howev...

AI Technical Summary

Problems solved by technology

But it has the disadvantage of low utilization rate of the input DC voltage, that is, the highest output voltage of the bridge arm is only half of the input DC voltage

The double-buck bridge inverter solves the problem of low utilization of the input DC bus voltage of the double-buck half-bridge inverter.

However, if the control method of the traditional double-buck half-bridge inverter is adopted, two current sensors are required, which increases the cost compared with the traditional bridge inverter; the use of bipolar modulation in the entire power frequency cycle increases the filter The volume and weight; all power switch tubes are switched at high frequency in half the power frequency cycle, and the switching loss is relatively high

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