Importance

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Abstract

A power control (20, 40) for controlling the electric power fed from voltage source (12) to a load (13) comprises a field effect transistor (21, Q1) for either allowing or disabling the flow of current from voltage source to load as a response to the presence or absence of a control pulse led to the gate of the field effect transistor. Additionally the power control comprises means for measuring the change of the gate potential of the field effect transistor (24, R6, R7) and for either allowing or disabling a control pulse on the basis of the gate potential change measurement. In the power control the control pulse is allowed to switch the field effect transistor (21, Q1) to conducting state when a stop (31) in the voltage increase due to Miller effect is detected at the start of the control pulse, and the control pulse is respectively disabled from switching the field effect transistor to conducting state when no Miller effect stop (33) is detected in the field effect transistor gate potential change at the start of the control pulse.

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First Claim