| Title |
A dv/dt Filter Design on the Voltage Reflection Theory at SiC Converter |
| Authors |
김동민(Dongmin Kim) ; 민명환(Myung-Hwan Min) ; 안태풍(Tae-Pung An) ; 차한주(Hanju Cha) |
| DOI |
https://doi.org/10.5370/KIEE.2024.73.1.69 |
| Keywords |
Characteristic impedance; dv/dt filter; Propagation delay; Voltage overshoot |
| Abstract |
This paper analyzes a voltage surge generation at the end of cable in an converter-cable-high impedance load system, and the analysis is based on the voltage reflection theory. Cable parameters are estimated by using the network analyzer, and the whole system is simulated for generation of voltage surge. A 150 V unit pulse from a SiC buck converter is injected to a high impedance load through several lengths of two cables. Voltage surge in terms of the ratio of rising time to the propagation time are analyzed.
In addition, the excessive voltage surge at the cable end is mitigated by adding a dv/dt filter at the converter output to increase rise time of PWM pulses. An effective dv/dt filter is proposed and verified through the experiment. Using a cable with a characteristics impedance of Zc=80.2? and a propagation delay of td = 44.2 ns, the dv/dt filter is able to reduce a voltage surge of 300V to 173V |