MOTOR DRIVE DEVICE WITH LOCK PROTECTION FUNCTION
First Claim
1. A motor drive device comprising:
- an Hall element;
a control input terminal configured to receive a control signal instructing rotation of a motor to be driven, the control signal being variable between a state to instruct stoppage of the motor and a state to instruct driving of the motor;
a pulse width modulator configured to generate a PWM signal based on the control signal from the control input terminal and a signal from an oscillator;
a drive unit configured to control energization of the motor based on a signal from the Hall element and the PWM signal;
a lock protection circuit configured to monitor a signal indicating a present rotational condition of the motor and to stop energization of the motor, when rotation of the motor is stopped;
a lock controller configured to have the lock protection circuit inactive, in cases in which the control signal continues to instruct stoppage of the motor for at least a predetermined first time-period, the predetermined first time-period being measured from a time at which the control signal transitions from the state to instruct driving of the motor to the state to instruct stoppage of the motor; and
a standby controller configured to start time measurement at an occasion when the control signal has continued to instruct stoppage of the motor for at least the first time-period, and after a further predetermined second time-period has elapsed, to stop at least part of the motor drive device, and to make the motor drive device transit to a standby mode.
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Accused Products
Abstract
A cooling system is provided with a motor drive device, a fan motor, and a Hall element. The motor drive device includes a lock protection circuit and a lock controller. When a control signal instructing rotation of the fan motor that is to be driven instructs stoppage of the motor for a predetermined time-period or longer, the lock controller has the lock protection circuit inactive. At an occasion when the control signal has continued to instruct stoppage of the fan motor for a first time-period or longer, a standby controller starts time measurement, and after a further predetermined second time-period has elapsed, makes at least a part of the motor drive device transition to a standby mode.
15 Citations
17 Claims
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1. A motor drive device comprising:
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an Hall element; a control input terminal configured to receive a control signal instructing rotation of a motor to be driven, the control signal being variable between a state to instruct stoppage of the motor and a state to instruct driving of the motor; a pulse width modulator configured to generate a PWM signal based on the control signal from the control input terminal and a signal from an oscillator; a drive unit configured to control energization of the motor based on a signal from the Hall element and the PWM signal; a lock protection circuit configured to monitor a signal indicating a present rotational condition of the motor and to stop energization of the motor, when rotation of the motor is stopped; a lock controller configured to have the lock protection circuit inactive, in cases in which the control signal continues to instruct stoppage of the motor for at least a predetermined first time-period, the predetermined first time-period being measured from a time at which the control signal transitions from the state to instruct driving of the motor to the state to instruct stoppage of the motor; and a standby controller configured to start time measurement at an occasion when the control signal has continued to instruct stoppage of the motor for at least the first time-period, and after a further predetermined second time-period has elapsed, to stop at least part of the motor drive device, and to make the motor drive device transit to a standby mode. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A cooling system comprising:
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a fan motor; and a motor drive device configured to drive, as the motor to be driven, the fan motor, the motor drive device comprising; an Hall element configured to detect rotation of a motor to be driven; a control input terminal configured to receive a control signal instructing rotation of the motor, the control signal being variable between a state to instruct stoppage of the motor and a state to instruct driving of the motor; a pulse width modulator configured to generate a PWM signal based on the control signal from the control input terminal and a signal from an oscillator; a drive unit configured to control energization of the motor based on a signal from the Hall element and the PWM signal; a lock protection circuit configured to monitor a signal indicating a present rotational condition of the motor and to stop energization of the motor, when rotation of the motor is stopped; a lock controller configured to have the lock protection circuit inactive, in cases in which the control signal continues to instruct stoppage of the motor for at least a predetermined first time-period, the predetermined first time-period being measured from a time at which the control signal transitions from the state to instruct driving of the motor to the state to instruct stoppage of the motor; and a standby controller configured to start time measurement at an occasion when the control signal has continued to instruct stoppage of the motor for at least the first time-period, and after a further predetermined second time-period has elapsed, to stop at least part of the motor drive device, and to make the motor drive device transit to a standby mode.
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9. A motor drive device comprising:
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an Hall element configured to detect rotation of a motor to be driven; a control input terminal configured to receive a control signal instructing rotation of the motor, the control signal being variable between a state to instruct stoppage of the motor and a state to instruct driving of the motor; a pulse width modulator configured to generate a PWM signal based on the control signal from the control input terminal and a signal from an oscillator; a drive unit configured to control energization of the motor based on a signal from the Hall element and the PWM signal; a lock protection circuit configured to monitor a signal indicating a present rotational condition of the motor and to stop energization of the motor, when rotation of the motor is stopped; and a lock controller configured to have the lock protection circuit inactive, in cases in which the control signal continues to instruct stoppage of the motor for at least a predetermined first time-period, the predetermined first time-period being measured from a time at which the control signal transitions from the state to instruct driving of the motor to the state to instruct stoppage of the motor, wherein the motor drive device starts time measurement at an occasion when the control signal has continued to instruct stoppage of the motor for at least the first time-period, and after a further predetermined second time-period has elapsed, the motor drive device makes transition to a standby mode. - View Dependent Claims (10, 11, 12, 13)
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14. A motor drive device comprising:
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an Hall element configured to detect rotation of a motor to be driven; a control input terminal configured to receive a control signal instructing rotation of the motor, the control signal being variable between a state to instruct stoppage of the motor and a state to instruct driving of the motor; a pulse width modulator configured to generate a PWM signal based on the control signal from the control input terminal and a signal from an oscillator; a drive unit configured to control energization of the motor based on a signal from the Hall element and the PWM signal; a lock protection circuit configured to monitor a signal indicating a present rotational condition of the motor and to stop energization of the motor, when rotation of the motor is stopped; and a lock controller configured to have the lock protection circuit inactive, in cases in which the control signal continues to instruct stoppage of the motor for at least a predetermined first time-period, the predetermined first time-period being measured from a time at which the control signal transitions from the state to instruct driving of the motor to the state to instruct stoppage of the motor, wherein the motor drive device starts time measurement at an occasion when the control signal has continued to instruct stoppage of the motor for at least the first time-period, and after a further predetermined second time-period has elapsed, the motor drive device stops at least part of the motor drive device. - View Dependent Claims (15, 16, 17)
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Specification