Method for controlling ZVT soft switching three-phase PWM inverter
A control method and inverter technology, which are applied in the direction of converting irreversible DC power input to AC power output, high-efficiency power electronic conversion, climate sustainability, etc. The hardware cost of the inverter system and other issues, to achieve the effect of low system cost, convenient control and simple structure
Inactive Publication Date: 2014-12-24
WUXI FORE AUTOMATION TECH
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[0002] In recent years, soft-switching frequency conversion and inverter technology has become the focus of experts and scholars at home and abroad. Several soft-switching three-phase inverter circuit topologies have been proposed in the literature to realize the soft switching action of the main circuit power switching device. However, in these In the circuit topology, there are many power switching devices in the auxiliary resonant circuit, the system control is relatively complicated, and the hardware cost of the inverter system is increased at the same time
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[0008] like figure 1 As shown in the figure, the ZVT soft-switching three-phase PWM inverter control method of the present invention is characterized in that a buffer capacitor is connected in parallel with each power switching device in the main circuit of the inverter. Turning off at any time is a zero voltage switching (ZVS) method; the PWM modulated carrier does not use the traditional triangular carrier, but uses a positive and negative slope sawtooth carrier whose slope changes alternately with the polarity of the inverter output current. The positive slope sawtooth wave is used when the output current polarity is positive, and the negative slope sawtooth wave is used when the output current polarity is negative.
[0009] The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled i...
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The invention discloses a method for controlling a ZVT soft switching three-phase PWM inverter. Each power switching element in an inverter main circuit is connected with a buffer capacitor in parallel, and due to the fact that capacitor voltages cannot change suddenly, the power switching elements are switched on and off in a zero voltage switching (ZVS) mode at any time. Traditional triangular carrier waves are not adopted as carrier waves modulated through PWM, positive and negative slope sawtooth carrier waves with the slope alternately changed along with the output current polarity of the inverter are adopted, when the output current polarity of the inverter is positive, the positive slope sawtooth carrier waves are adopted, and when the output current polarity of the inverter is negative, the negative slope sawtooth carrier waves are adopted. Only one current conversion switch is adopted in the auxiliary resonant link, and the method has the advantages of being simple in structure, low in system cost, convenient to control and the like.
Description
technical field [0001] The invention relates to a ZVT soft-switching three-phase PWM inverter control method. Background technique [0002] In recent years, soft-switching frequency conversion and inverter technology have become the focus of attention of experts and scholars both inside and outside the world. Several soft-switching three-phase inverter circuit topologies have been proposed in the literature to realize the soft-switching action of power switching devices in the main circuit. In the circuit topology, there are many power switching devices in the auxiliary resonant circuit, the system control is relatively complicated, and the hardware cost of the inverter system is increased at the same time. This paper studies the main circuit topology and control strategy of a new type of AC resonance link ZVT soft-switching three-phase PWM inverter, which has the characteristics of simple structure, convenient control, low system cost and high efficiency. The operation mod...
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CPCY02B70/10
Inventor 钱国东
Owner WUXI FORE AUTOMATION TECH