Current Limit Control Method of DC Motor and Related Device and Circuit
AssigneeAnpec Electronics Corporation
InventorsMing-Jung Tsai, Ching-Sheng Li, Kun-Min Chen
Life of this patent
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Abstract
A control method of a current limit of a DC motor includes generating a reference voltage according to a preset current limit value of a DC motor; comparing the reference voltage with the voltage drop of a power control switch which drives the DC motor to generate a compare result; and controlling the power delivered to the DC motor according to the compare result in order to limit the current of the DC motor.
Claims52
A control method of a current limit of a DC motor comprising:
- generating a reference voltage according to a preset current limit value of a DC motor;
- comparing the reference voltage with the voltage drop of a power control switch which drives the DC motor to generate a compare result;
- and
- controlling the power delivered to the DC motor according to the compare result in order to limit the current of the DC motor.
A current limit device for controlling a DC motor comprising:
- a reference voltage generating unit, for generating a reference voltage according to a preset current limit value of a DC motor;
- a comparing unit, for comparing the reference voltage with the voltage drop of a power control switch which drives the DC motor to generate a compare result;
- and
- a control unit, for controlling the power delivered to the DC motor in order to limit the current of the DC motor according to the compare result.
A motor control circuit for controlling a DC (direct-current) motor, for conducting current between a first end and a second end of the DC motor to generate kinetic energy, the motor control circuit comprising:
- a power supply device, for supplying a DC power;
- a plurality of power control switches, each comprising a first end, a second end and a third end, for controlling the signal connections between the first end and the third end, according to a signal of the second end;
- a plurality of output ends, each coupled to a second end of a power control switch, for controlling the current conduction of the power control switch;
- a first input end, coupled to the first end of the DC motor;
- a second end, coupled to the second end of the DC motor;
- and
- a current limit device, comprising:
- a reference voltage generating unit, for generating a reference voltage according to a preset current limit value of a DC motor;
- a comparing unit, coupled to the reference voltage generating unit, the first input end and the second input end, for selecting an input end between the first input end and the second input end, and comparing the voltage of the selected input end with the reference voltage to generate a compare result according to the direction of the motor current;
- and
- a control unit, coupled to the comparing unit, for controlling the power delivered to the DC motor according to the compare result, in order to limit the current of the DC motor.
Dependencies are inferred from the claim text.