FAN MOTOR DRIVING CIRCUIT
First Claim
1. A fan motor driving circuit which controls an energized state of a fan motor by performing on and off control of a switching circuit connected to a coil of the fan motor, the fan motor driving circuit comprising:
- a variable reference voltage circuit which generates a voltage whose voltage level changes with time by charging or discharging a capacitor at the start of starting up the fan motor;
a drive signal combining unit which generates a drive signal on the basis of a voltage output from the variable reference voltage circuit when at least starting up, and performs on and off control of the switching circuit by the drive signal; and
an initialization circuit which initializes the capacitor by discharging a charge across the capacitor with a transition from off to on of a power supply voltage to be supplied to the fan motor driving circuit as a turning point.
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Accused Products
Abstract
A fan motor driving circuit controls an energized state of a fan motor by performing on and off control of a switching circuit connected to a coil of the fan motor of a driving object. A variable reference voltage circuit generates a voltage whose voltage level changes with time by charging or discharging a capacitor at the start of starting up the fan motor. A drive signal combining unit generates drive signals on the basis of the voltage when at least starting up, and performs on and off control of the switching circuit by the drive signals. An initialization circuit initializes the capacitor before starting up with a transition from off to on of a power supply voltage to be supplied to the fan motor driving circuit as a turning point.
25 Citations
12 Claims
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1. A fan motor driving circuit which controls an energized state of a fan motor by performing on and off control of a switching circuit connected to a coil of the fan motor, the fan motor driving circuit comprising:
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a variable reference voltage circuit which generates a voltage whose voltage level changes with time by charging or discharging a capacitor at the start of starting up the fan motor; a drive signal combining unit which generates a drive signal on the basis of a voltage output from the variable reference voltage circuit when at least starting up, and performs on and off control of the switching circuit by the drive signal; and an initialization circuit which initializes the capacitor by discharging a charge across the capacitor with a transition from off to on of a power supply voltage to be supplied to the fan motor driving circuit as a turning point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A driving method of a fan motor, which controls an energized state of the fan motor by performing on and off control of a switching circuit connected to a coil of the fan motor of a driving object, the driving method comprising:
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generating a voltage that changes with time by charging or discharging a capacitor at the start of starting up the fan motor; generating a drive signal on the basis of the generated voltage when at least starting up, and performing on and off control of the switching circuit by the drive signal; and initializing the capacitor by discharging a charge across the capacitor with a transition from off to on of a power supply voltage to be supplied to the fan motor driving circuit as a turning point.
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Specification