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Due to the high switching speed of SiC MOSFET, the parasitic parameters and the low damping in the circuit, the turn-off overvoltage and oscillation of the freewheeling diode and SiC MOSFET are very severe. Based on the terminal impedances during the turn-off transition of the freewheeling diode and SiC MOSFET, the mechanism of the turn-off overvoltage and oscillation are analyzed and the suppressing...
This paper presents a soft-switching single-phase three-arm dynamic voltage restorer which aimed at solving voltage disturbances such as voltage swell, voltage sag, over-voltage and under-voltage. The proposed scheme is composed of a three-arm topology which operates as a rectifier and an inverter. Rather than the conventional four-arm topology, the proposed three-arm topology not only reduces the...
In this paper, a novel soft-switching three-arm series-compensation automatic voltage regulator is proposed. The proposed automatic voltage regulator (AVR) uses a three-arm topology that operates as a rectifier and an inverter. The rectifier arm is switched at high switching frequency, to perform power factor correction and simultaneously transfer the power demand for the load to the DC link capacitor...
This paper proposed a novel single-phase soft-switching unipolar PWM active power filter (SSUPAPF). The proposed active power filter uses a simple auxiliary resonant circuit. The main switches of high-frequency arm operate at zero-voltage- switching (ZVS) turn-on. Also, the auxiliary switches operate at zero-current-switching (ZCS) turn-off. The main switches of low-frequency arm operate at 60Hz to...
A novel four main switches and four auxiliary switches power converter configuration of the three-phase voltage-doubler soft-switching rectifier is proposed in this paper. The reduction in the number of main switches can also increase the reliability because the control circuits and the auxiliary circuits are thereby reduced to two sets. All main switches in the proposed rectifier operate at zero-voltage-switching...
To adapt to the rapid development of multi-standard mobile communication, a low noise amplifier (LNA) that can operate at two frequencies of 800MHz and 1.8GHz respectively was designed. SiGe HBTs with good noise performance were used in the design. The Cascode circuit topology was adopted to reduce the Miller effect of the transistor. Inductor degeneration in emitter was introduced to decouple the...
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