System for driving electromagnetic appliance and motor driven vehicle

摘要

In one embodiment, system for driving an electromagnetic appliance includes an electromagnetic appliance, a main-drive unit and a sub-drive unit. The electromagnetic appliance includes coils for n number of phases, the coils for each of the n phases being arranged in a pair and wound so as to be excited in a predetermined direction by being energized with opposite-phase currents. The main drive unit is connected to each of the coils and energizes the paired coils with opposite-phase currents. The sub-drive unit is provided parallel with the main-drive unit and is configured to suppress a short-circuit current occurring at the main-drive unit when switching energization of the coils.

主权项

1. A system for driving an electromagnetic appliance comprising:
an electromagnetic appliance; and a drive unit driving the electromagnetic appliance, the drive unit including a first power converter converting a direct current voltage inputted from a pair of direct current power source lines into an n-phase alternating current voltage, where n is a positive integer equal to or greater than 2, a second power converter converting the direct current voltage into an n-phase alternating current voltage, and a controller controlling operations of the first and the second power converters; wherein the first and the second power converters each includes a main-half bridge circuit for each of the n phases and a sub-half bridge circuit for each of the n phases being in parallel connection with one another between the pair of direct current power source lines, an n number of sub-inductors disposed between a midpoint of the main-half bridge circuit for each of the n phases and a mid point of the sub-half bridge circuit for each of the n phases, each of the main-half bridge circuits including a pair of main-switching elements, a main-freewheeling diode in an inverse-parallel connection with each of the main-switching elements, and each of the sub-half bridge circuits including a pair of sub-switching elements, and wherein the electromagnetic appliance includes a first coil and a second coil for each of the n phases being connected to a midpoint of the main-half bridge circuit for each of the n phases provided in the first and the second power converters, and an iron core on which both the first and the second coils for each of the n phases are wound, the electromagnetic appliance being configured to excite the iron core in a predetermined direction by energizing the first and the second coils for each of the n phases with n-phase currents being opposite in phase from one another, and wherein the controller is configured to control the first and the second power converters so that the n-phase alternating current voltage is applied to the first and the second coils for each of the n phases, and is further configured so that both of the pair of main-switching elements of each of the n phases are turned off during a simultaneous off period, the simultaneous off period including a first period in which a freewheeling current flows through a main-freewheeling diode of a given phase located at a different position than a main-switching element of said given phase being turned on after the simultaneous off period, and a sub-switching element of said given phase turned on during the first period.