Patent ID: 9170587
Filing Date: 2015-10-27
Classification: G05F,H02P

Abstract:
1. A current control semiconductor element comprising: a transistor arranged on a semiconductor chip, for driving a load, a current-to-voltage conversion circuit arranged on the semiconductor chip for converting a current of the load into a voltage, wherein the current of the load is controlled using a feedback control, an AD converter arranged on the semiconductor chip for converting the voltage output from the current-to-voltage conversion circuit into a digital value, wherein the current control semiconductor element comprises: a reference current generator that superimposes a current pulse on the current of the load when the load is applied with the current by the feedback control and changes the voltage digital value to be output from the AD converter; a gain/offset corrector that executes signal processing on change in the voltage digital value caused by the reference current generator to dynamically acquire a gain and an offset that are used in an equation that indicates a linear relationship between the voltage digital value output from the AD converter and the current digital value of the load, wherein the equation is Ioutd=a·Voutd+b, Ioutd is the current digital value of the load, a is the gain, Voutd is the voltage digital value output from the AD converter, and b is the offset; and a current digital value calculator that uses the gain and the offset acquired by the gain/offset corrector to correct the voltage value output from the AD converter.