Patent ID: 8446116
Filing Date: 2013-05-21
Classification: H02M,H02P

Abstract:
1. A discharge control device for a power conversion system, the power conversion system including: a DC/AC conversion circuit including a plurality of pairs of a high-side switching element and a low-side switching element connected in series, connection nodes of the pairs being connected to corresponding phases of an electric rotating machine, the high-side and low-side switching elements of each of the pairs being on/off-controlled in accordance with manipulation signals received from outside the discharge control device to make and break an electrical connection between one of positive and negative electrodes of a capacitor and a corresponding one of the phases of the electric rotating machine, the high side and low-side switching elements being voltage-controlled switching elements each including a conduction control terminal; and a switch section which is turned and off to make and break an electrical connection between a DC power source and a parallel connection of the DC/AC conversion circuit and the capacitor, the discharge control device comprising: a discharge control section that performs a discharge control on condition that the switch section is off in order to reduce a charge voltage of the capacitor by turning on the high-side and low-side switching elements of a predetermined one of the pairs at the same time to make a short circuit between the positive and negative electrodes of the capacitor; and a restraining section that manipulates voltages respectively applied to the conduction control terminals of the high-side and low-side switching elements of the other pairs other than the predetermined pair in order to prevent a current flowing to the electric rotating machine through the other pairs while the discharge control is performed.