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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...
A decoupling capacitors (decaps) selection algorithm based on maximum anti-resonance points of the power distribution network and the quality factor (Q) of the capacitor is proposed. The experimental results show that the proposed algorithm is superior to the fast algorithm regarding the number of consuming decaps and the genetic algorithm regarding the time consumed.
In order to improve the input impedance of stacked boost converter (SBC) that processes only a part of the total power delivery, the traditional three-capacitor structure is optimized as single-capacitor structure in this paper. Then small signal models of push-pull SBC based on these two capacitor structures are set up, the loop gain and input impedance are analyzed and compared. Finally, the effectiveness...
Stacked boost converter (SBC) is widely adopted in aerospace applications because of the superiority of high efficiency, continuous current and easily controlled system. In the SBC with three-capacitor, the resonance of the stray inductance of stacked branch and output capacitors worsen the closed-loop input impedance and audio susceptibility. In order to eliminate the resonance, three-capacitor is...
Compared to mechanical solution, solid-state circuit breaker (SSCB) offers enormous advantages in terms of switching speed and maintenance. With fast switching performance, high current turn-off capability, self-power and built-in sensor functions, SPETO is a very promising high power switching device for the application of SSCB in power distribution system. The experimental results show that the...
Self-power emitter turn-off thyristor (SPETO) is a high power switching device which could provide power for its gate drive during operation. Self-power function reduces the system cost and makes the mechanical structure compact, whereas it may bring extra harmonic when SPETO is being utilized in power utilities. In this paper, the impact of self-power function on extra harmonic is analyzed. The ideas...
This paper presents a 10 MVA multilevel inverter for the application of static synchronous compensator (STATCOM). Emitter turn-off (ETO) thyristors are used as active switching devices in the inverter. The cascade multilevel inverter is based on ETO light H-bridge building block (HBBB). The technology innovations of ETO simplify the HBBB construction. Air-cooled heat pipes also decrease the cost and...
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