Controller for power bipolar transistor

摘要

A base current controlling circuit for a power bipolar transistor comprising a first controlling device giving the base current only two states which are a "conduction" state and a "cut-off" state, and a second controlling device adjusting the condition of the power bipolar transistor to a predetermined preferable condition by controlling the base current value in response to a result of detection of a condition of the power bipolar transistor.