Patent ID: 9260019
Filing Date: 2016-02-16
CPC Classification: B60L,Y02T

Claim Text:
1. A drive system comprising: a first switching unit configured to convert energy, stored in an electrical storage device, to electric power that is supplied to a motor; a first capacitor connected to the first switching unit and configured to smooth voltage that is supplied from the electrical storage device to the first switching unit; a step-down circuit connected to the first capacitor and configured to step down voltage of the first capacitor; a second capacitor connected to the step-down circuit and configured to draw electric charge stored in the first capacitor; and a discharging unit configured to discharge electric charge stored in the second capacitor, wherein the step-down circuit includes a second switching unit, the second switching unit is configured to adjust a rate, at which electric charge stored in the first capacitor is drawn by the second capacitor, by controlling a duty ratio, and the step-down circuit is configured to decrease the voltage of the first capacitor to lower than or equal to a predetermined value within 5 seconds by controlling the second switching unit.