Patent ID: 6208041
Filing Date: 2001-03-27
Classification: H03K

Abstract:
A drive control device for being connected with n switching elements, where n is at least 2, which are connected in parallel with one another and for repeatedly renewing n control signals which control n main currents flowing across said n switching elements respectively by controlling drive voltages of said n switching elements on a basis of n current detection signals representing detected values of said n main currents and thereby supplying said n switching elements with said n control signals, comprising:an A/D conversion unit for converting said n current detection signals from analogue form to digital form;an operation unit for executing digital operation processing on a basis of said n current detecting signals having digital form to thereby calculate said n control signals; anda D/A conversion unit for converting said n control signals calculated by said operation unit from digital form to analogue form, said D/A conversion unit being coupled to n drive units for adjusting drive voltages applied respectively to said n switching elements on the basis of said n control signals;said operation unit comprising:a current calculation unit for converting said n current detection signals having digital form into said n main currents respectively;a current deviation calculation unit for calculating an average of said n main currents and calculating n current deviations which are respectively differences of said n main currents from said average; anda control signal calculating unit for renewing said n control signals to reduce each of said n current deviations.