Patent ID: 8901865
Filing Date: 2014-12-02
Classification: H02P

Abstract:
1. A current limiting device for vehicle connected to a condenser at an input terminal and to a motor generator at an output terminal, comprising: a switching portion that passes and cuts off a current from the input terminal to the output terminal; a reflux portion that is connected to a connection point of the switching portion and the output terminal and supplies the current to the motor generator while the switching portion is cutting off the current; a current measurement portion that measures the current flowing from the output terminal to the motor generator; and a current control portion that controls the current between the condenser and the motor generator by alternately switching the switching portion ON and OFF by use of PWM control by which a conductive rate of the switching portion is varied by changing an ON/OFF time ratio in a constant carrier cycle, according to a current value measured by the current measurement portion, wherein, when the motor generator is rotary driven using electric power of the condenser, the current control portion limits the current to the motor generator by controlling the switching portion to alternately switch, during each cycle of the current measurement by the current measurement portion, the switching portion ON and OFF in a case where the measured current value is equal to or exceeds a first current value, and when the motor generator generates power, the current control portion keeps the switching portion ON.