CN201966857U - Range hood DC motor speed control device - Google Patents

Abstract

The utility model provides a range hood direct current motor rotational speed controlling means, contain a motor drive circuit, a direct current brushless motor and a monitoring module, this motor drive circuit contains a pulse width modulation controller and an electricity and is connected to the phase control circuit of this pulse width modulation controller, this direct current brushless motor electricity is connected to this motor drive circuit, this monitoring module contains a microprocessor, this microprocessor can produce a speed control signal, send to this motor drive circuit, to correspondingly produce a pulse width modulation signal to this phase control circuit, make this phase control circuit do the phase modulation in order to output a rotational speed control voltage, this direct current brushless motor changes this direct current motor rotational speed according to this rotational speed control voltage, therefore, the utility model discloses can provide the brushless motor rotational speed of range hood more than four sections.

Description

Range hood DC motor speed control device

technical field

The utility model relates to a motor speed control device for a range hood, in particular to a DC motor speed control device for a range hood.

Background technique

Most of the existing range hoods are used by the user to manually start the fan motor and adjust the motor speed. However, on the one hand, the user is often unable to distract and adjust the motor speed synchronously during cooking, and on the other hand, the user cannot judge the inside of the range hood In the case of temperature changes, the motor will be damaged if it is operated at high temperature for too long. Therefore, there are proposals to automatically start the motor and adjust the speed of the motor. However, no matter what kind of motor, it can only provide three-stage speed, so it can be further improved. To provide more kinds of speed.

Contents of the invention

In order to solve the problem that the existing range hood motor can only provide three speeds, the utility model provides a speed control device for the DC motor speed of the range hood that can improve the existing shortcomings, so that the motor of the range hood can provide more than four stages. Rotating speed.

The technical means used in the utility model is to provide a speed control device for a range hood DC motor, including:

An AC-DC conversion circuit for converting AC power into DC power;

A multi-stage speed switching unit, including at least four speed switching switches, and outputting corresponding motor control signals according to the selected speed switching switches;

A motor drive circuit, including a pulse width modulation controller and a phase control circuit electrically connected to the pulse width modulation controller, the motor drive circuit generates a pulse width modulation signal and sends it to the phase control circuit, so that the The phase control circuit performs phase modulation to output a speed control voltage;

A DC brushless motor, electrically connected to the motor drive circuit, the DC brushless motor changes the speed of the DC brushless motor according to the aforementioned speed control voltage; and

A monitoring module, including a microprocessor electrically connected to the multi-stage speed switching unit and the pulse width modulation controller; when the microprocessor receives the motor control signal, it generates a pair of speed corresponding to the motor control signal A speed control signal, and output the speed control signal to the motor drive circuit to generate the corresponding pulse width modulation signal.

The utility model provides a safe range hood DC motor speed control device, wherein the monitoring module further includes a sensing module electrically connected to the microprocessor, the motor drive circuit and the DC brushless motor, and the sensing module includes a temperature sensing module, a current sensing module and a rotational speed sensing module; wherein the temperature sensing module is used to detect the temperature of the DC brushless motor and the motor drive circuit to generate The aforementioned sensing signal of temperature information, the current sensing module is used to detect the consumption current of the DC brushless motor to generate the aforementioned sensing signal containing current information, and the rotational speed sensing module is used to detect the rotational speed of the DC brushless motor To generate the aforementioned sensing signal including the rotational speed information of the brushless DC motor; the monitoring module further includes an abnormality protection module; when the microprocessor judges that the temperature, current and rotational speed of the sensing module are abnormal, it reduces or stops The brushless DC motor stops running.

The utility model provides a high convenience DC motor speed control device for a range hood, wherein the sensing module of the monitoring module is a range hood temperature sensing module to detect the temperature of the range hood.

The aforementioned range hood DC motor speed control device further includes a lighting unit, the lighting unit includes a lighting module and a lighting switching device; wherein the lighting switching device is sent to the microprocessor after receiving an external input to be able to Correspondingly, a lighting signal is generated and sent to the lighting module to provide lighting.

In the aforementioned range hood DC motor speed control device, the multi-stage speed switching unit and the lighting switching device are integrated into a touch display, and after receiving external input and sending it to the microprocessor, the microprocessor A display signal is correspondingly generated and sent to the touch display for displaying corresponding information.

In the aforementioned range hood DC motor speed control device, the monitoring module further includes a remote control receiving circuit, which is electrically connected to the microprocessor, and after receiving a remote control input, the remote control receiving circuit transmits to the microprocessor The device can correspondingly generate the aforementioned motor control signal, lighting signal and display signal.

In the above-mentioned speed control device for the DC motor of the range hood, the phase control circuit includes three-phase coils and can correspondingly generate three-phase voltages.

The utility model utilizes the provided range hood DC motor speed control device, and the specific benefits that can be obtained are:

1. The utility model enables the range hood to provide more than four rotation speeds, so that the range hood can better cooperate with the user and have better smoke exhaust efficiency.

2. The utility model can adjust the motor speed correspondingly according to the internal temperature, the motor speed, the current input to the motor, and the temperature of the range hood chassis. It can also detect whether the motor is running abnormally and respond quickly, improving the safety of use. sex and convenience.

Description of drawings

Fig. 1 is the circuit block diagram of preferred embodiment of the present utility model;

Fig. 2 is a partial circuit block diagram of a preferred embodiment of the present utility model;

Fig. 3 is a perspective view of a preferred embodiment of the utility model.

Description of reference signs: 10-AC-DC conversion circuit; 20-lighting unit; 21-lighting module; 22-lighting switching device; 30-multi-stage speed switching unit; 31-speed switching switch; 40-motor drive circuit; 41- Pulse width modulation controller; 42-phase control circuit; 50-brushless DC motor; 60-monitoring module; 61-microprocessor; 62-sensing module; 621-temperature sensing module; 622-current sensing module ; 623-speed sensing module; 624-range hood temperature sensing module; 63-remote control receiving circuit.

Detailed ways

In order to understand the technical characteristics and practical effects of the utility model in detail, and to implement it according to the contents of the specification, the preferred embodiment shown in the accompanying drawings will be described in detail as follows:

The preferred embodiment of the range hood DC motor speed control device provided by the utility model is shown in Figures 1 to 3, which includes an AC-DC conversion circuit 10, a lighting unit 20, a multi-stage speed switching unit 30, A motor driving circuit 40 , a DC brushless motor 50 and a monitoring module 60 .

The AC-DC conversion circuit 10 is used to convert AC power into DC power to supply power to the aforementioned circuits.

The lighting unit 20 includes a lighting module 21 and a lighting switching device 22 , and the lighting module 21 is illuminated by LED lamps.

The multi-stage rotation speed switching unit 30 includes six rotation speed switching switches 31 , and outputs corresponding motor control signals according to the selected rotation speed switching switches 31 .

The motor drive circuit 40 includes a pulse width modulation controller 41 and a phase control circuit 42 electrically connected to the pulse width modulation controller 41. The phase control circuit 42 includes three-phase coils and can generate three-phase voltages correspondingly. The motor drive circuit 40 generates a pulse width modulation signal and sends it to the phase control circuit 42, so that the phase control circuit 42 performs phase modulation to output a rotational speed control voltage.

The DC brushless motor 50 is electrically connected to the motor drive circuit 40, and the DC brushless motor 50 changes the speed according to the aforementioned speed control voltage, and can cooperate with the multi-stage speed switching unit 30 to provide at least four speeds; in this embodiment Cooperate with the six-speed switching switch 31 to provide six-stage rotating speed.

The monitoring module 60 includes a microprocessor 61, a sensing module 62 electrically connected to the microprocessor 61 and a remote control receiving circuit 63 electrically connected to the microprocessor 61, and the microprocessor 61 is electrically connected to the The lighting switching device 22, the multi-stage speed switching unit 30 and the pulse width modulation controller 41 include an abnormality protection module, the abnormality protection module includes an abnormality protection program, and the sensing module 62 is electrically connected to the motor drive The circuit 40 and the DC brushless motor 50 include a temperature sensing module 621, a current sensing module 622, a rotational speed sensing module 623 and a range hood temperature sensing module 624, and the remote control receiving circuit 63 receives After receiving a remote control input, it is sent to the microprocessor 61;

The temperature sensing module 621 is used to detect the temperature of the brushless DC motor 50 and the motor driving circuit 40 to generate the aforementioned sensing signal containing temperature information, and the current sensing module 622 is used to detect the brushless DC motor 50 consumption current to generate the aforementioned sensing signal containing current information, the rotational speed sensing module 623 is used to detect the rotational speed of the brushless DC motor 50 to generate the aforementioned sensing signal including rotational speed information, the range hood temperature sensing module 624 is used to detect the temperature of the range hood to generate the aforementioned sensing signal.

The aforementioned multi-stage rotation speed switching unit 30 and lighting switching device 22 are integrated into a touch display, and after receiving external input and sending it to the microprocessor 61, the microprocessor 61 generates a corresponding display signal and sends it to the touch display The display is used for displaying corresponding information.

The aforementioned lighting switching device 22 or the remote control receiving circuit 63 can be sent to the microprocessor 61 to generate a corresponding lighting signal and send it to the lighting module 21 to provide lighting after receiving external input; and the aforementioned multi-stage speed switching unit 30 or After the remote control receiving circuit 63 receives external input and transmits it to the microprocessor 61, the microprocessor 61 generates a corresponding display signal and sends it to the touch display to display the corresponding information, and the microprocessor 61 receives the input After receiving the motor control signal from the multi-stage speed switching unit 30 or the remote control receiving circuit 63, a speed control signal is correspondingly generated, and the motor driving circuit 40 generates the pulse width modulation correspondingly after receiving the aforementioned speed control signal. Signal;

In addition, the microprocessor 61 executes the abnormality protection program to obtain the states of the brushless DC motor 50 and the motor driving circuit 40 measured by the sensing module 62, and the microprocessor 61 judges that the sensing module 62 When the temperature, current and speed of the return motor are abnormal, reduce or stop the brushless DC motor to stop running.

And the abnormal protection program of aforementioned microprocessor 61 can be applied as follows:

After the temperature sensing module 621 detects the temperature of the brushless DC motor 50 and the motor driving circuit 40, the microprocessor 61 judges whether the temperature is too high according to the sensing signal containing temperature information returned by the temperature sensing module 621. (If it exceeds 100°C), if it is too high, the speed control signal is used to reduce the speed of the brushless DC motor 50 or stop the operation of the brushless DC motor 50;

After the current sensing module 622 detects the current consumption of the brushless DC motor 50, the microprocessor 61 judges whether the current is too high according to the sensing signal containing current information returned by the current sensing module 622, and if so, first passes The speed control signal is used to reduce the speed of the brushless DC motor 50, and if the current is still too high, the speed control signal is further passed to stop the brushless DC motor 50 from running;

After the rotation speed sensing module 623 detects the rotation speed of the brushless DC motor 50, the microprocessor 61 judges whether the brushless DC motor 50 is running according to the rotation speed information of the brushless DC motor 50 sent back by the rotation speed sensing module 623. Normal, if the brushless DC motor 50 is stuck and unable to run, then the speed control signal is used to stop the brushless DC motor 50 from running;

After the range hood temperature sensing module 624 detects the temperature of the range hood, the microprocessor 61 automatically judges the current amount of oil fume according to the temperature. The motor rotates at 50 rpm; on the contrary, if the temperature is too low, it will automatically judge that there is too little oil smoke, which means that the current rpm is relatively high, and automatically reduce the brushless DC motor at 50 rpm, which can also achieve the effect of power saving.

The motor of the utility model can provide more than four stages of speed, so that the range hood can better cooperate with the user and have better smoke exhaust efficiency. The temperature of the range hood chassis can be adjusted accordingly to adjust the motor speed. It can also detect whether the motor is running abnormally and respond quickly, improving the safety and convenience of use.

The above is only a preferred embodiment of the utility model, and is not intended to limit the utility model in any form. Anyone with ordinary knowledge in the technical field, if not departing from the scope of the technical characteristics of the utility model Within the scope of the technical features of the present utility model, the equivalent embodiments that make partial changes or modifications using the technical content disclosed in the present utility model and do not deviate from the technical features of the present utility model still belong to the scope of the technical features of the present utility model.

Claims (8)

1. A range hood DC motor speed control device, characterized in that it comprises: An AC-DC conversion circuit, which is used to convert AC power into DC power; A multi-stage speed switching unit, which includes at least four speed switching switches, and outputs corresponding motor control signals according to the selected speed switching switches; A motor drive circuit, which includes a pulse width modulation controller and a phase control circuit electrically connected to the pulse width modulation controller, the motor drive circuit generates a pulse width modulation signal and sends it to the phase control circuit, so that The phase control circuit performs phase modulation to output a speed control voltage; A DC brushless motor, which is electrically connected to the motor drive circuit, and the DC brushless motor changes the speed of the DC brushless motor according to the aforementioned speed control voltage; and A monitoring module, which includes a microprocessor electrically connected to the multi-stage speed switching unit and the pulse width modulation controller; after receiving the motor control signal, the microprocessor generates a speed corresponding to the speed of the motor control signal control signal, and output the rotational speed control signal to the motor drive circuit to generate the corresponding pulse width modulation signal. 2. The device for controlling the speed of the range hood DC motor according to claim 1, wherein the monitoring module further includes a sensing module, the sensing module is electrically connected to the microprocessor, the motor drive The circuit and the DC brushless motor, and the sensing module includes a temperature sensing module, a current sensing module and a rotational speed sensing module; wherein the temperature sensing module is used to detect the DC brushless motor and the motor drive The temperature of the circuit is used to generate the aforementioned sensing signal including temperature information. The current sensing module is used to detect the consumption current of the brushless DC motor to generate the aforementioned sensing signal including current information. The rotational speed sensing module is used to detect the The rotational speed of the DC brushless motor is used to generate the aforementioned sensing signal including the rotational speed information of the DC brushless motor; the monitoring module further includes an abnormality protection module, and the microprocessor judges that the sensing module returns abnormalities in motor temperature, current and rotational speed , that is, reduce or stop the operation of the brushless DC motor. 3. The range hood DC motor speed control device according to claim 2, wherein the sensing module of the monitoring module is a range hood temperature sensing module, which is used to detect the temperature of the range hood . 4. The range hood DC motor speed control device according to claim 1, wherein the sensing module of the monitoring module is a range hood temperature sensing module, which is used to detect the temperature of the range hood . 5. The range hood DC motor speed control device according to any one of claims 1 to 4, characterized in that it further comprises a lighting unit, which comprises a lighting module and a lighting switching device; wherein the lighting After the switching device receives the external input, it is sent to the microprocessor to generate a corresponding lighting signal and send it to the lighting module to provide lighting. 6. The range hood DC motor speed control device according to claim 5, characterized in that, the multi-stage speed switching unit and the lighting switching device are integrated into a touch display, and after receiving external input and sending it to the micro After the processor, the microprocessor correspondingly generates a display signal and sends it to the touch display, and the touch display is used to display corresponding information. 7. The range hood DC motor speed control device according to claim 6, wherein the monitoring module further includes a remote control receiving circuit, which is electrically connected to the microprocessor, and the remote receiving circuit receives After a remote control input, it is sent to the microprocessor, which can correspondingly generate the aforementioned motor control signal, lighting signal and display signal. 8 . The device for controlling the speed of the DC motor of the range hood according to claim 7 , wherein the phase control circuit includes three-phase coils, which can correspondingly generate three-phase voltages. the

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