초록 ▼

Disclosed is a multi-speed control apparatus for a fan motor. The apparatus includes a driving member, a motor speed sensing member, a resistor circuit, a voltage-division resistor, and a multi-segment switch. The driving member has a controlled end connected with the multi-segment switch. The drivi

Disclosed is a multi-speed control apparatus for a fan motor. The apparatus includes a driving member, a motor speed sensing member, a resistor circuit, a voltage-division resistor, and a multi-segment switch. The driving member has a controlled end connected with the multi-segment switch. The driving member has an output end connected with the fan motor. The driving member has a detection end connected with the motor speed sensing member. The resistor circuit includes some resistors with various resistances. The multi-segment switch interconnects the resistor circuit, the voltage-division resistor, the controlled end of the driving member, and a voltage source. This switch is optionally connected to the resistor disposed in the voltage source or voltage-division resistor. An input voltage is created across the resistor by dividing the voltage. The driving member is therefore provided for driving the fan motor to a rotating speed according to the input voltage.

대표청구항 ▼

1. A multi-speed control apparatus for a fan motor, comprising: a motor speed detection member for generating a feedback signal in response to a rotating speed of the fan motor;a resistor circuit, having resistor elements with various resistances;a voltage-division resistor;a multi-segment switch, e

1. A multi-speed control apparatus for a fan motor, comprising: a motor speed detection member for generating a feedback signal in response to a rotating speed of the fan motor;a resistor circuit, having resistor elements with various resistances;a voltage-division resistor;a multi-segment switch, electrically interconnecting the resistor circuit, the voltage-division resistor, and a voltage source, wherein the multi-segment switch optionally connects any one of resistor element to the voltage source and the voltage-division resistor for creating an input voltage across the resistor element by dividing voltage; anda driving member, having a detection end, a controlled end, and an output end, wherein the detection end is connected with the motor speed detection member, the controlled end is connected with the multi-segment switch, and the output end is connected with the fan motor; wherein the detection end receives the feedback signal, the controlled end receives the input voltage via the multi-segment switch, and the driving member is used to drive the fan motor to a specific rotating speed according to the input voltage. 2. The apparatus according to claim 1, wherein the driving member is implemented by an integrated circuit, a micro-controller, or a single chip. 3. The apparatus according to claim 1, wherein the motor speed detection member is a Hall sensing integrated circuit. 4. The apparatus according to claim 1, wherein the multi-segment switch includes a switching contact and multiple segmented contacts, and the switching contact is connected to the controlled end of the driving member, and connected to the voltage source via the voltage-division resistor; wherein the segmented contacts individually connect the resistor elements with various resistances. 5. The apparatus according to claim 4, wherein the switching contact of the multi-segment switch and the controlled end of the driving member further connect to a first capacitor, and the capacitor is used to stabilize the input voltage created across any resistor element by dividing voltage. 6. The apparatus according to claim 1, wherein the driving member includes a minimum rotating speed set contact, which is used to receive a critical voltage for a minimum rotating speed, and the driving member drives the fan motor to the minimum rotating speed when the input voltage is larger than the critical voltage. 7. The apparatus according to claim 6, wherein the driving member drives the fan motor to the specific rotating speed when the input voltage is smaller than the critical voltage for the minimum rotating speed. 8. The apparatus according to claim 7, wherein the driving member further includes an oscillation signal set contact, which is connected to a second capacitor, and the driving member internally generates an oscillation signal according to the second capacitor. 9. The apparatus according to claim 8, wherein the driving member generates a driving signal for driving the fan motor to the specific rotating speed according to a result of comparison between the oscillation signal and the input voltage. 10. The apparatus according to claim 9, wherein the driving signal is a pulse-width modulation signal.