초록 ▼

A voltage regulator maintains an output voltage of an alternator of a vehicle to a voltage in the vicinity of a preset voltage. The voltage regulator has a microcomputer for setting the OFF duty ratio, a switching circuit for switching on or off an electric current flowing through a rotor coil of th

A voltage regulator maintains an output voltage of an alternator of a vehicle to a voltage in the vicinity of a preset voltage. The voltage regulator has a microcomputer for setting the OFF duty ratio, a switching circuit for switching on or off an electric current flowing through a rotor coil of the alternator and a load sensor for detecting the operation of the intermittent load. The microcomputer sets the OFF duty ratio to a value directly proportional to the difference between the output voltage and the preset voltage before the operation of the intermittent load is started. And the microcomputer gradually decreases the OFF duty ratio set by said duty ratio setting means at the initial operation time of the intermittent load, and memorizes the OFF duty ratio when the output voltage reaches its upper limit value exceeding the preset voltage. The microcomputer changes the OFF duty ratio to an average value of the OFF duty ratio set by the duty ratio setting means and the OFF duty ratio memorized by the memory means when the reoperation of the intermittent load is detected within a prescribed time after the initial operation of the intermittent load.

대표청구항 ▼

A voltage regulator for maintaining an output voltage of an alternator of a vehicle, which is provided with a rotor coil and to which an intermittent load is connected, to a preset voltage, comprising: duty ratio setting means for setting a duty ratio corresponding to the difference between the outp

A voltage regulator for maintaining an output voltage of an alternator of a vehicle, which is provided with a rotor coil and to which an intermittent load is connected, to a preset voltage, comprising: duty ratio setting means for setting a duty ratio corresponding to the difference between the output voltage and the preset voltage; switching means for switching on and off an electric current flowing through the rotor coil of the alternator in accordanoe with the duty ratio set by said duty ratio setting means; intermittent load operation detecting means for detecting the operation of the intermittent load; first duty ratio changing means for increasing or decreasing the duty ratio set by the duty ratio setting means by a fixed value at the initial operation time of the intermittent load; memory means for memorizing the duty ratio when the output voltage exceeds the preset voltage and reaches its upper limit value at the initial operation time of the intermittent load; and second duty ratio changing means for changing the duty ratio to that determined by the duty ratio set by said duty ratio setting means and the duty ratio memorized by said memory means at least while the intermittent load is operated, upon detecting the reoperation of the intermittent load within a prescribed time after the initial operation of the intermittent load.