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Shanghai, China

Bin H.,Sanken L.D Electric Co. | Cui H.,Sanken L.D Electric Co.
Conference Proceedings - 2012 IEEE 7th International Power Electronics and Motion Control Conference - ECCE Asia, IPEMC 2012 | Year: 2012

Because of the conventional two-level topology, without isolation transformer of three-phase 380V solar inverter difficult to suppress harmonics and leakage current, this paper proposes a new low-cost, high reliability solution. Based on the same LC filter parameters of three-level topology, using an improved FFT algorithm to obtain real-time spectrum analysis of output current, and accordingly to compensate and control output voltage, achieve the purpose of output current correction and harmonic suppression. To solve the leakage current of three-phase four-wire, two-level solar inverter without isolation transformer, by using a 3FB-SC(The Three-phase Full-Bridge VSI Inverter With Split Capacitor) topology, and increasing impedance on the N line to achieve the third harmonic suppression on the N line. Verified by 10kW prototype testing, the maximum conversion efficiency is up to 97%, the output of Ithd = 3%, the normal leakage current is less than 30mA; therefore it has a strong practical value. © 2012 IEEE. Source


Cui H.,Sanken L.D Electric Co. | Ito Y.,Sanken Electric Co. | Nakano K.,Sanken Electric Co. | Yokoyama N.,Sanken Electric Co. | Bin H.,Sanken L.D Electric Co.
Conference Proceedings - 2012 IEEE 7th International Power Electronics and Motion Control Conference - ECCE Asia, IPEMC 2012 | Year: 2012

This paper describes the design of 100kVA EV (electric Vehicle) Charger which outputs 750V/150A. For the requirement of different type of EV, 13 units are in series; this can make the output voltage as the following: 40V-60V, 400V-600V or 500V-750V, and output voltage and current of each unit are 48V/150A. AC/DC of unit is Buck-type converter, this makes 350V of DC bus; it is very cheap for selection of power device of DC/DC. Resonant circuits are used in this part for high efficiency. It makes voltage of power device become zero before the power device turns on, so turn-on loss can be ignored. DC/DC part uses LLC resonant circuit, and power device can work in ZVS (zero voltage switching) condition and high frequency (about 100 kHz), so this part has high efficiency and small volume. To make charging faster and more security, two control loops are used in the power supply: one is voltage-loop and the other is current-loop. Power factor of input is above 0.99, and harmonic of input is less than 5%, the overall efficiency is more than 92% by charging experiment for bus. © 2012 IEEE. Source

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