Electricity: motive power systems – Battery-fed motor systems
Patent
1992-01-27
1994-01-25
Ro, Bentsu
Electricity: motive power systems
Battery-fed motor systems
388811, 3889075, H02P 729
Patent
active
052819000
ABSTRACT:
A DC motor controller for use with a battery powered DC motor operatively positioned in a vehicle is disclosed. A power source-watch dog circuit 2 monitors a micro computer 8 and decreases the battery supplied voltage to below a predetermined voltage. A key switch input circuit 3 receives a switch-on signal generated by a key switch and outputs a signal to the power source-watch dog circuit 2 to initiate electrical power output from the battery 1 to the micro computer 8. A pedal input circuit 4, which includes a pedal for varying electrical resistance, converts the varied resistance into an analog signal and outputs the analog signal to the micro computer 8. The micro computer converts the analog signal to a digital signal and outputs the digital signal. A D/A converter converts the digital signal outputted by the micro computer into an analog signal and outputs the analog signal. A pulsewidth modulator 10 modulates the analog signal and outputs the modulated signal. A gate output circuit 11 generates a logic signal having a "high" or a " low" level according to the modulated signal outputted by the pulsewidth modulator 10 and outputs the logic signal to a motor driver 16 which operates the DC motor. A battery voltage sensor 7 senses the voltage of the battery 1 and outputs a battery voltage sensor signal to the micro computer 8. A temperature sensor 13 senses the temperature of the motor driver and outputs a temperature sensor signal to the micro computer 8. An output current sensor circuit 12 senses current flowing through the motor driver 16 and outputs a current sensor signal to the micro computer 8. A vehicle direction changing sensor 6 prevents an overload of the DC motor 17 by sensing an abrupt change in the direction the vehicle is being driven and outputs a vehicle direction changing sensor signal to the micro computer 8.
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Hyundai Electronics Industries Co,. Ltd.
Ro Bentsu
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