| Abstract |
Electrical systems using solid-state devices and controlled by computer have more and more being developed. The new architecture opens up new possibilities of measuring current. In static DC circuit breaker, the current measurement can be easier carried out by means of switch voltage drop than other classical methods. This paper describes the design and the test results of this current measuring principle in an IGBT DC circuit breaker. A computer along with an analogue circuit is used to estimate the IGBT junction temperature, to compensate the IGBT on-state characteristic drift, and then to compute the current from the voltage drop measurement. It is shown that such a design gives a good measure precision in the current range of static circuit breaker applications. |
