Abstract
In the application of vehicle power supply and distributed power generation, there are strict requirements for the pulse width modulation (PWM) converter regarding power density and reliability. When compared with the conventional insulated gate bipolar transistor (IGBT) module, the Reverse Conducting-Insulated Gate Bipolar Transistor (RC-IGBT) with the same package has a lower thermal resistance and higher current tolerance. By applying the gate desaturation control, the reverse recovery loss of the RC-IGBT diode may be reduced. In this paper, a loss threshold desaturation control method is studied to improve the output characteristics of the single-phase PWM converter with a low switching frequency. The gate desaturation control characteristics of the RC-IGBT’s diode are studied. A proper current limit is set to avoid the ineffective infliction of the desaturation pulse, while the bridge arm current crosses zero. The expectation of optimized loss decrease is obtained, and the better performance for the RC-IGBTs of the single-phase PWM converter is achieved through the optimized desaturation pulse distribution. Finally, the improved predictive current control algorithm that is applied to the PWM converter with RC-IGBTs is simulated, and is operated and tested on the scaled reduced power platform. The results prove that the gate desaturation control with the improved predictive current algorithm may effectively improve the RC-IGBT’s characteristics, and realize the stable output of the PWM converter.
Highlights
The main feature of the pulse width modulation (PWM) converter is ensuring the high power factor and AC side sine wave current control on the target of the output DC voltage, as well as on the bidirectional power transmission
The improved predictive current control algorithm that is applied to the PWM converter with RC-insulated gate bipolar transistor (IGBT) is simulated, and is operated and tested on the scaled reduced power platform
The results prove that the gate desaturation control with the improved predictive current algorithm may effectively improve the Reverse Conducting-Insulated Gate Bipolar Transistor (RC-IGBT)’s characteristics, and realize the stable output of the PWM converter
Summary
The main feature of the pulse width modulation (PWM) converter is ensuring the high power factor and AC side sine wave current control on the target of the output DC voltage, as well as on the bidirectional power transmission. With the development of power semiconductor devices, the improvement of modeling and control strategy and sensing technology, the working performance of PWM converters is constantly improving. The current research on PWM converters mainly concentrates on three aspects: new circuit topology, universality of the converter mathematical model, and control strategy [1,2,3,4,5]. [7] gave a mathematical model of a single-phase PWM converter based on the unipolar modulation in the stationary coordinate and d-q coordinate. Due to the fact that power devices are the cornerstone of the converter system, there have been researches
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