CN104660123B - Fan motor control device - Google Patents

Abstract

The present invention relates to a fan motor control device, comprising 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 detection unit generates a synchronous reference signal to the phase control unit, and the phase control unit generates a phase control signal to the operation processing unit. The operation processing unit generates a processing signal for starting the motor to the first rectifier element and the second rectifier element and drives the fan motor. The phase control unit can control the output power and the rotation speed to achieve the effect of increasing the fan rotation speed and having better heat dissipation and exhaust.

Description

Fan Motor Control

technical field

The present invention relates to a fan motor control device, in particular to a fan motor control device that can effectively increase the fan speed to achieve better heat dissipation and air exhaust effects.

Background technique

With the advancement of technology, people's dependence on various electronic devices has also increased; however, the components inside electronic devices (such as computers, notebook computers) will generate high heat during operation. Outside the equipment, it is prone to overheating problems.

Wherein taking a computer as an example, its internal heat-generating components such as a central processing unit (Central Processing Unit, CPU) or a power supply (Power Supply) etc., so when the computer is in operation, the central processing unit (CPU) ) under high-speed calculation processing, the high temperature generated will cause the central processing unit to fall into an unstable state. The light one will crash, and the severe one will burn or damage the central processing unit. Therefore, in order to solve the problem of heat dissipation, At least one heat dissipation fan is arranged in the computer, and the aforementioned heat is quickly exported to the outside by means of the heat dissipation fan forcibly dissipating heat from the central processing unit.

Generally, cooling fans use single-phase AC motors. For single-phase induction motors, the single-phase power supply cannot generate a rotating magnetic field. The magnetic field generated by it is a magnetic field that changes in size, but the direction does not change, so the motor cannot be started. The alternating current passes through the stator coil of the motor, and the magnetic field generated is not a fixed magnetic field, but a variable magnetic field of the N pole and S pole that changes with time. Using this characteristic, the surrounding magnetic field can be designed to change at different times and in different positions. Push the rotor to keep it running;

Therefore, the single-phase induction motor must be started by converting the single-phase power supply into two phases, so there are at least two-phase windings in the single-phase induction motor, and converting a single phase into two phases is called phase separation, and the commonly used phase separation method is Capacitor start type;

The main structure of its capacitive motor is a two-phase AC motor, which is mainly due to the phase shifting effect of an external capacitor on the wiring line with silicon steel sheets and coils, and the power supply on the electromagnet formed by it produces a phase difference and makes the motor rotate;

However, the energy conversion efficiency of general capacitive motors is poor, and when the main components of the silicon steel sheet, coil, capacitive element and voltage are fixed at the same time, the speed of the capacitive motor cannot be increased and the output power cannot be controlled according to demand, thereby affecting Its heat dissipation and exhaust effect.

Contents of the invention

Therefore, in order to effectively solve the above problems, the main purpose of the present invention is to provide a fan motor control device that can increase the speed of the fan and achieve better heat dissipation and exhaust effects.

The secondary purpose of the present invention is to provide a fan motor control device which can save the rectification and filter circuit used for power input, so as to save the space used by the circuit board.

To achieve the above object, the present invention provides a fan motor control device, comprising: a zero-crossing detection unit, which generates a synchronous reference signal after power supply; a phase control unit, which is connected to the zero-crossing detection unit and receives the synchronous reference signal , and generate a phase control signal capable of controlling output power and rotational speed according to the synchronous reference signal; an arithmetic processing unit is connected to the phase control unit and generates a processing signal according to the phase control signal; a first rectifying element is Connecting the arithmetic processing unit and sending a first phase signal to a first coil unit according to the processing signal; and a second rectifying element for connecting the arithmetic processing unit and sending a second phase signal to the A second coil unit drives the fan motor according to the first phase signal and the second phase signal.

The first phase signal and the second phase signal are antiphase signals.

Only one set of phase signals of the first phase signal and the second phase signal will output and drive the fan motor at the same time.

The first rectifying element and the second rectifying element are silicon controlled rectifiers (SCR).

It also includes a power output unit, which supplies power to the zero-crossing detection unit and sends a square wave signal to the zero-crossing detection unit at the same time.

The phase control unit receives the synchronous reference signal and acts on an AC sine wave, and changes the conduction angle of the AC sine wave according to the synchronous reference signal to control the magnitude of the voltage, thereby generating a phase that can control output power and rotational speed control signal.

It also includes a temperature sensing unit, which can detect the external temperature and generate a temperature sensing signal to the operation processing unit, and the operation processing unit performs the operation according to the phase control signal and the temperature sensing signal computing and generating the processing signal.

It also includes a position detection unit, which can detect the stop position of the motor running and generate a position detection signal to the operation processing unit, and the operation processing unit performs the operation according to the phase control signal and the position detection signal computing and generating the processing signal.

In this way, the output power and rotation speed are controlled by the phase control unit of the present invention, so that the fan speed can be increased and the effect of better heat dissipation and air exhaust can be achieved.

Description of drawings

Fig. 1 is the schematic block diagram of the first preferred embodiment of the present invention;

Fig. 2 is the block diagram of the second preferred embodiment of the present invention;

FIG. 3 is a schematic block diagram of a third preferred embodiment of the present invention.

Symbol Description

Fan Motor Control 1

Zero-crossing detection unit 11

Phase control unit 12

Operation processing unit 13

first rectifying element 141

Second rectifying element 142

The first coil unit 151

Second coil unit 152

Power output unit 16

Temperature sensing unit 17

Position detection unit 18

detailed description

Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

The above-mentioned purpose of the present invention and its structural and functional characteristics will be described according to the preferred embodiments of the accompanying drawings.

A fan motor control device 1, please refer to Fig. 1 is a schematic block diagram showing a first preferred embodiment of the present invention; the aforementioned fan motor control device 1 includes a zero-crossing point detection unit 11, a phase control unit 12, an operation Processing unit 13, a first rectifying element 141 and a second rectifying element 142, the zero-crossing detection unit 11 is electrically connected to the phase control unit 12, and the phase control unit 12 is also electrically connected to the operation processing unit 13. The arithmetic processing unit 13 is electrically connected to the first rectifying element 141 and the second rectifying element 142 at the same time, and the first and second rectifying elements are also electrically connected to a first coil unit 151 and a second coil unit 152;

Furthermore, the fan motor control device 1 further has a power output unit 16 that is electrically connected to the zero-crossing detection unit 11, and the power output unit 16 is used to supply power to the zero-crossing detection unit 11, and when supplying At the same time, a square wave signal is sent to the zero-crossing detection unit 11 when the power is supplied, and the zero-crossing detection unit 11 detects the zero-crossing point of the voltage, that is, the positive half cycle and negative half cycle of the voltage and the positive and negative zero crossing points send out positive square waves and positive pulses Signal and send out a synchronous reference signal, which can be provided to the back end as a synchronous reference;

Therefore, the synchronous reference signal is sent to the phase control unit 12, and the phase control unit 12 applies its synchronous reference signal to the AC sine wave, and changes the conduction angle of the sine wave to control the magnitude of the voltage, thereby adjusting the output Therefore, the phase control unit 12 receives the synchronous reference signal and acts on an AC sine wave, and changes the conduction angle of the AC sine wave according to the synchronous reference signal to control the magnitude of the voltage, and then Generate phase control signals that can control output power and speed;

The phase control signal generated by the phase control unit 12 is sent to the operation processing unit 13, which is a central processing unit (MCU), and the operation processing unit 13 receives the phase control signal and will be processed by The parameters obtained by the phase control signal are calculated and a processing signal for starting the motor is generated;

Send the processed signal to the first rectifying element 141 and the second rectifying element 142, wherein the first rectifying element 141 and the second rectifying element 142 are silicon controlled rectifiers (SCR), And replace the known rectification and filtering circuit with the first rectification element 141 and the second rectification element 142 to save space on the circuit board;

And its first rectifying element 141 sends a first phase signal according to the processing signal, and sends its first phase signal to the first coil unit 151 electrically connected, and the second rectifying element 142 simultaneously according to the The processing signal sends out a second phase signal, and sends the second phase signal to the electrically connected second coil unit 152, wherein the first phase signal and the second phase signal are anti-phase signals, and their The first phase signal and the second phase signal can only output one set of phase signals at the same time, and the output first phase signal and the second phase signal correspond to the fixed magnet inside the motor to generate mutual repulsion to drive the fan motor and make the fan or The motor rotates; thereby, the phase control unit 12 of the present invention controls the output power and rotational speed, thereby achieving the effect of increasing the rotational speed of the fan and having better heat dissipation and exhaust.

Please refer to Fig. 2, which shows a schematic block diagram of the second preferred embodiment of the present invention; the main structure and connection relationship and effects of the preferred embodiment are roughly the same as those of the first preferred embodiment, so we will not repeat them here , the difference between the two is that the fan motor control device 1 further includes a temperature sensing unit 17, which can detect the external temperature and generate a temperature sensing signal to the operation processing unit 13 , the calculation processing unit 13 performs calculations according to the parameters generated by the phase control signal and the temperature sensing signal and generates the processing signal, so that the fan motor control device 1 can adjust the required temperature by detecting the external temperature. The fan speed can be increased to achieve better heat dissipation and air exhaust effects.

Please refer to Fig. 3, which is a schematic block diagram showing a third preferred embodiment of the present invention; the main structure and connection relationship and effects of this preferred embodiment are roughly the same as those of the aforementioned first preferred embodiment, so they will not be repeated here. The difference between the two lies in that the fan motor control device 1 also includes a position detection unit 18, which can detect the stop position of the previous motor operation and generate a position detection signal to the operation processing unit 13. The calculation processing unit 13 performs calculations based on the phase control signal and the position detection signal to generate the processing signal, and then controls the fan motor control device 1 to use the first coil unit 151 or the second coil unit 152 start operation.

In summary, the present invention has the following advantages compared to the prior art:

Fan speed can be increased;

It has better heat dissipation and exhaust effect;

Save circuit board space.

Although the present invention is disclosed above in terms of implementation, it is not intended to limit the present invention. Any person familiar with the art may make various modifications and modifications without departing from the spirit and scope of the present invention. Therefore, this The scope of protection of the invention should be determined by the claims.

Claims (8)

1. A fan motor control device, comprising: A zero-crossing detection unit, which generates a synchronous reference signal after power supply, specifically: the zero-crossing detection unit implements the detection voltage zero-crossing, that is, the positive half cycle and negative half cycle of the voltage and the positive and negative zero-crossing points send out positive square waves and positive pulse signals And send a synchronous reference signal, which can be provided to the back end as a synchronous reference; A phase control unit is connected to the zero-crossing detection unit and receives the synchronous reference signal, and generates a phase control signal that can control output power and rotational speed according to the synchronous reference signal; An arithmetic processing unit is connected to the phase control unit and generates a processing signal according to the phase control signal; A first rectifying element is connected to the arithmetic processing unit and sends a first phase signal to a first coil unit according to the processing signal; and a second rectifying element is connected to the arithmetic processing unit and according to the processing signal A second phase signal is sent to a second coil unit, and the fan motor is driven according to the first phase signal and the second phase signal. 2. The fan motor control device as claimed in claim 1, wherein the first phase signal and the second phase signal are anti-phase signals. 3 . The fan motor control device as claimed in claim 1 , wherein only one phase signal of the first phase signal and the second phase signal is output to drive the fan motor at the same time. 4 . 4. The fan motor control device as claimed in claim 1, wherein the first rectifying element and the second rectifying element are silicon controlled rectifiers. 5. The fan motor control device as claimed in claim 1, further comprising a power output unit, the power output unit supplies power to the zero-crossing detection unit, and simultaneously sends a square wave signal to the zero-crossing detection unit. 6. The fan motor control device according to claim 5, wherein the phase control unit receives the synchronous reference signal and acts on an AC sine wave, and changes the conduction angle of the AC sine wave according to the synchronous reference signal to Control the magnitude of the voltage, and then generate a phase control signal that can control the output power and speed. 7. The fan motor control device according to claim 1, further comprising a temperature sensing unit, which can detect the external temperature and generate a temperature sensing signal to the operation processing unit, the operation processing unit Computing is performed according to the phase control signal and the temperature sensing signal to generate the processing signal. 8. The fan motor control device according to claim 1, further comprising a position detection unit, the position sensing unit can detect the stop position of the motor running and generate a position detection signal to the operation processing unit, the operation processing unit The operation is performed according to the phase control signal and the position detection signal to generate the processed signal.