| AC/DC converter is the most widely used converter in the power system. Power factor correction technology is widely used to reduce the harmonic pollution of power supply and improve the power factor. At present, the single-phase PFC is already developed, but three-phase PFC is still in the stage of library works.High-frequency PWM rectifier can regulate the output voltage with sinusoidal input current. But this method has practical disadvantages since it is not efficient. In high power conditions, the multi-pulse rectifier has been used widely. This approach has several advantages such high efficiency and no additional EMI. Traditional twelve-pulse rectifier can eliminate the 5th,7th harmonics. However, input current THD is 11.3% in this method.In this paper, a 12-pulse diode rectifier with an auxiliary voltage circuit is proposed. The purpose is to obtain a 12-pulse diode rectifier whose harmonic contents are reduced a lot. The auxiliary voltage circuit consists of two single-phase voltage converters which can be controlled conveniently. The auxiliary voltage reaches to the main circuit through transformer to improve the wave form of the input current. However, this approach can't regulate the output. In order to solve this problem, this paper analyze a wide input rang active multi-pulse rectifier with Boost modules. Rich single-phase technology is used in the method. The circuit adopts the continuous current method, and adopts soft switch technology to rise efficiency effectively.In conclusion, the correctness and feasibility of the circuit based on Boost is verified by the mathematical analysis, simulation research and experiments validation. |
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