PRECISE PULSE TYPE CURRENT SOURCE FOR A MEASUREMENT EQUIPMENT NECESSARY FOR MEASURING AN AC PROPERTY OF A POWER SEMICONDUCTOR ACCURATELY

摘要

PURPOSE: A precise pulse type current source is provided to offer a precise current without using a complicated feedback circuit.;CONSTITUTION: A reference voltage source(500) supplies voltage to the gate of an output transistor(530). A switch(520) controls the voltage supply into the gate of the output transistor according to a driving voltage applied to a measuring element in order to eliminate a spike current caused by an inrush current which is generated when turning on the measuring element. A voltage limiter(510) activates the output transistor(530) in a domain in which a CELP-heating does not generate as limiting the voltage of the reference voltage source.;COPYRIGHT KIPO 2013