Control device and control method

A control device for controlling a recovery from a locking of a first motor and a second motor, comprising:

• a first switching unit which supplies a motor current from a current supplying unit to the first motor and the second motor on the basis of a PWM control signal;
• a second switching unit which turns on/off the first motor and the second motor on the basis of an ON/OFF signal;
• an overheating interrupting unit which detects a temperature of the second switching unit to output the OFF signal for turning off the first motor and the second motor when the detected temperature is greater than a predetermined value;
• and
• a driving control unit which supplies the PWM control signal to control a driving of the first switching unit and supplies the ON/OFF signal to control a driving of the second switching unit, and supplies the OFF signal to the second switching unit when receiving the OFF signal from the overheating interrupting unit,
• wherein the driving control unit supplies the PWM control signal with a low duty ratio lower than a regular duty ratio to the first switching unit when at least one of the locking of the first motor and the second motor is detected depending on a variation in temperature of the first switching unit;
• and
• wherein the driving control unit supplies the PWM control signal with the regular duty ratio to the first switching unit when a cancel of the locking of the at least one of the first motor and the second motor is detected depending on a variation in inter-terminal voltage of the at least one of the first motor and the second motor.

A control method of controlling a recovery from a locking of a motor, the control method comprising:

• supplying a motor current from a current supplying unit to the motor via a switching unit;
• supplying a PWM control signal to the switching unit to control a driving of the switching unit;
• supplying the PWM control signal with a low duty ratio lower than a regular duty ratio to the switching unit when the locking of the motor is detected depending on a variation in temperature of the switching unit;
• and
• supplying the PWM control signal in the regular duty ratio to the switching unit when a cancel of the locking of the motor is detected depending on a variation in inter-terminal voltage of the motor.

A control method of controlling a recovery from a locking of a first motor and a second motor, the control method comprising:

• supplying a motor current from a current supplying unit to the first motor and the second motor on the basis of a PWM control signal via a first switching unit;
• turning on/off the first motor and the second motor on the basis of an ON/OFF signal via a second switching unit;
• detecting a temperature of the second switching unit;
• outputting a signal for turning off the first motor and the second motor when the detected temperature of the second switching unit is greater than a predetermined value;
• controlling the driving of the first switching unit in response to the PWM control signal;
• controlling the driving of the second switching unit in response to the ON/OFF signal;
• supplying the OFF signal to the second switching unit when the OFF signal is received;
• supplying the PWM control signal in a low duty ratio lower than a regular duty ratio to the first switching unit when the locking of at least one of the first motor and the second motor is detected depending on a variation in temperature of the first switching unit;
• and
• supplying the PWM control signal in the regular duty ratio to the first switching unit when a cancel of the locking of the at least one of the first motor and the second motor is detected depending on a variation in inter-terminal voltage of at least one of the first motor and the second motor.