Single-stage inverter

Abstract

The invention discloses a single-stage inverter. The single-stage inverter comprises an input power source Uin, a first switch A, a second switch B, a first power switch tube S1, a second power switch tube S2, a third power switch tube S3, a fourth power switch tube S4, a fifth power switch tube S5, a sixth power switch tube S6, a first diode D1, a second diode D2 and an energy storage capacitor C. A passive component capacitor serves as an energy exchanging component. According to the novel single-stage inverter structure, the circuit working area is reasonably divided, the input power source energy consumption can be reduced, the service life of the input power source can be prolonged, and the single-stage inverter can be widely applied to the fields of photovoltaic grid-connected inverters, hybrid electric vehicles and the like.

Description

technical field [0001] The invention relates to a converter, especially a single-stage inverter. Background technique [0002] The traditional voltage source inverter inputs DC voltage and outputs AC voltage, and has a wide range of applications. The input DC voltage of the voltage source inverter can be obtained from the power grid or the rotating AC motor through rectification and filtering, and can also be obtained from batteries, fuel cells or photovoltaic cells, corresponding to general industrial applications (such as frequency converters), electric vehicles, renewable energy Distributed power generation and other occasions. In the voltage source inverter, due to the input DC voltage, the power semiconductor device is always kept forward biased, and the input power is always in the working state. For the battery, fuel cell or photovoltaic cell as the input power, it will cause its own Increased loss will affect the service life, such as attached figure 1 shown. [...

AI Technical Summary

Problems solved by technology

For example, in the electric drive system of electric vehicles and hybrid electric vehicles, the DC voltage is generally determined by the battery or fuel cell voltage, so the speed range of the constant torque output of the drive motor is determined by the battery voltage. If the battery loss is excessive, the battery voltage will decrease. If the speed is further increased, it will enter the constant power range. Insufficient battery voltage will lead to a decline in the acceleration ability of the vehicle. In the prior art, the method of connecting the booster circuit in series will lead to problems such as complex system structure and cumbersome control.

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