Fan motor control device

• US 9,291,169 B2
• Filed: 12/11/2013
• Issued: 03/22/2016
• Est. Priority Date: 12/11/2013
• Status: Active Grant

• Current Assignee: Asia Vital Components Company Limited
• Original Assignee: Asia Vital Components Company Limited
• Inventors: Chao, Chih-Chiang, Chen, Mao-Lin
• Primary Examiner(s): Santana, Eduardo Colon
• Assistant Examiner(s): AGARED, GABRIEL T
• Application Number:
  US14/102,815
• Publication Number:
  US 20150159663A1
• Time in Patent Office: 832 Days
• Field of Search: 318/816
• US Class Current: 1/1
• CPC Class Codes: F04D 25/0613 the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator
• CPC Class Codes: F04D 25/08 the working fluid being air, e.g. for ventilation
• CPC Class Codes: F04D 27/001 Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
• CPC Class Codes: F04D 27/004 by varying driving speed
• CPC Class Codes: H02P 1/42 for starting an individual single-phase induction motor H02P27/04 takes precedence
• CPC Class Codes: H02P 1/426 by using a specially adapted frequency converter
• CPC Class Codes: H02P 23/07 Polyphase or monophase asynchronous induction motors
• CPC Class Codes: Y02B 30/70 Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

A fan motor control device includes a zero-crossing detection unit, a phase control unit, an operation processing unit, a first rectifier element and a second rectifier element. The zero-crossing unit generates a synchronization reference signal to the phase control unit, which in turn generates a phase control signal to the operation processing unit. According to the received phase control unit, the operation processing unit generates a motor-starting processing signal to the first and the second rectifier element for driving a fan motor to rotate. Since the phase control unit provides the effect of controlling the fan motor'"'"'s output power and rotational speed, it enables the fan to have increased rotational speed and provide improved heat dissipation and ventilation effects.

Claims

1. A fan motor control device for use with a fan motor, comprising:

a zero-crossing detection unit being supplied with electric power and receiving a square wave signal from an electric power output unit which the zero-crossing detection unit detects zero-crossings of voltage of the electric power supplied from the electric power output unit and that generates a synchronization reference signal;

a phase control unit being electrically connected to the zero-crossing detection unit for receiving the synchronization reference signal, and generating a phase control signal according to the synchronization reference signal for controlling the fan motor'"'"'s output power and rotational speed;

an operation processing unit being electrically connected to the phase control unit and generating a processing signal according to the phase control signal;

a first rectifier element being electrically connected to the operation processing unit and generating a first phase signal according to the processing signal for sending to a first coil unit;

a second rectifier element being electrically connected to the operation processing unit and generating a second phase signal according to the processing signal for sending to a second coil unit;

whereby the fan motor is driven to rotate according to one of the first phase signal and the second phase signal; and

wherein the phase control unit applies the received synchronization reference signal to an AC sine wave and changes a turn-on angle of the AC sine wave according to the synchronization reference signal, so as to control a voltage magnitude of the supplied electric power and generate the phase control signal for controlling the fan motor'"'"'s output power and rotational speed.

2. The fan motor control device as claimed in claim 1, wherein the first phase signal and the second phase signal are inverted in phase.

3. The fan motor control device as claimed in claim 1, wherein only one of the first phase signal and the second phase signal is output each time for driving the fan motor to rotate.

4. The fan motor control device as claimed in claim 1, wherein the first and the second rectifier element are silicon controlled rectifiers.

5. The fan motor control device as claimed in claim 1, further comprising a temperature sensor unit for detecting ambient temperature and generating a temperature sensing signal to the operation processing unit;

and the operation processing unit performing an operation according to the phase control signal and the temperature sensing signal to generate the processing signal.

6. The fan motor control device as claimed in claim 1, further comprising a position detection unit for detecting a position, at where the fan motor stopped rotating in last operation, and generating a position detection signal to the operation processing unit;

and the operation processing unit performing an operation according to the phase control signal and the position detection signal to generate the processing signal.