Single-stage boost inverter

Abstract

The invention discloses a single-stage boost inverter. By taking full advantages of a distributed inductor and a parasitic inductor, the distributed inductor, the parasitic inductor and an external capacitor form a passive network and are participated in the working condition of the single-stage boost inverter. According to the single-stage boost inverter with medium and high power, when the through vector state of the single-stage boost inverter is converted into a non-through state, distributed inductance and parasitic inductance exist in a direct current bus link, and then extremely high voltage spike can be generated on a direct current bus of the inverter, so that a power tube is easy to burn out. In order to improve the reliability of the inverter, a stage of suppression circuit is needed to be added. A stage of suppression circuit does not need to be specially added to the single-stage boost inverter disclosed by the invention, and the single-stage boost inverter is suitable for lower power levels and also suitable for higher power levels.

Description

technical field [0001] The invention relates to an inverter, in particular to a single-stage boost inverter with the function of suppressing a DC bus voltage spike. Background technique [0002] The single-stage boost inverter (Z-source inverter, quasi-Z-source inverter) has three working modes: through zero-vector state, effective vector state, and open-circuit zero-vector state. [0003] Due to the distributed inductance and parasitic inductance in the DC bus link, when the single-stage boost inverter is switched from the through state to the non-through state, the DC bus voltage has a high voltage spike, which is very easy to damage the power device. [0004] In order to absorb the voltage spike on the DC bus, a suppression circuit must be added, such as figure 1 As shown, in order to solve the traditional RC, RCD, RCD limiter snubber circuit in the single-stage boost inverter, the DC bus voltage is too high and the loss is too large, and the LCD snubber circuit will osc...

AI Technical Summary

Problems solved by technology

In this way, the resistor only consumes energy when it is not straight through, but for a single-stage boost inverter with high power and high current, this part of the loss is very large, so this absorption circuit is only suitable for single-stage boost inverters with small and medium power. voltage inverter

[0005] For medium and high-power inverters, traditional inverters usually use busbars to reduce the distributed inductance of the DC busbar and reduce the voltage peak of the DC busbar, but the cost of the busbar is relatively high

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