Control device of motor, control system, and control method
AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
InventorHideki Kimura
Life of this patent
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Abstract
According to one embodiment, there is provided a control device including a drive circuit and a control circuit. The drive circuit includes a plurality of transistors and a current determination circuit. The plurality of transistors is electrically connected in parallel to each other between a first node and a second node. The first node is connected to a power supply circuit. The second node is connected to a DC motor. The current determination circuit determines a current flowing between the first node and the second node. The control circuit generates a control signal to control a number of transistors to be turned on among the plurality of transistors in accordance with the determined current. The drive circuit drives the DC motor using a current in response to the control signal.
Claims18
A control device comprising:
- a drive circuit including a plurality of transistors and a current determination circuit, the plurality of transistors being electrically connected in parallel to each other between a first node and a second node, the first node being connected to a power supply circuit, the second node being connected to a DC motor, the current determination circuit determining a total current flowing between the first node and the second node;
- and
- a control circuit that generates a control signal to control a number of transistors to be turned on among the plurality of transistors in accordance with the determined total current,
- wherein the drive circuit drives the DC motor using a current in response to the control signal, and
- the control circuit
- turns on a first number of transistors among the plurality of transistors in a first period,
- turns on a second number of transistors, smaller than the first number, among the plurality of transistors in a second period, and
- turns on a third number of transistors, smaller than the second number, among the plurality of transistors in a third period.
A control method comprising:
- determining a total current flowing between a first node and a second node, the first node being connected to a power supply circuit, the second node being connected to a DC motor, a plurality of transistors being electrically connected in parallel between the first node and the second node;
- generating a control signal to control a number of transistors to be turned on among the plurality of transistors in accordance with the determined total current;
- and
- driving a DC motor with a current corresponding to the control signal, wherein
- the driving includes
- turning on a first number of transistors among the plurality of transistors in a first period,
- turning on a second number of transistors, smaller than the first number, among the plurality of transistors in a second period, and
- turning on a third number of transistors, smaller than the second number, among the plurality of transistors in a third period.
Dependencies are inferred from the claim text.