CN2140114Y - Universal speed regulation switch for fan - Google Patents

Abstract

A universal speed control switch for fans, which belongs to the electronic switch that controls the power supply voltage to adjust the speed of the fan motor and provides time program selection, including a switch shell and an electronic circuit. Tube and digital tubes for displaying the size of the speed regulation and the timing value, and the electronic circuit includes a micro-controller, a power grid voltage edge zero circuit and a display circuit controlled by the micro-controller. The utility model has no mechanical parts and rotating parts, has high reliability, has a microcontroller to complete the functions of speed regulation, timing and simulation of natural wind, saves energy, can be used for any type of electric fan, and can also be used for light adjustment.

Description

The utility model relates to a universal speed regulating switch for a fan, which belongs to an electronic switch which controls a power supply voltage to regulate a motor speed and provides time program selection.

At present, the commonly used fan speed control switches include the manual speed control switch using the band switch and the reactor connected in series, and the stepless speed control switch using the rotary potentiometer to change the conduction angle of the thyristor to adjust the voltage. The above speed control switch only has The speed regulation function, due to the use of band switches and potentiometers, has poor reliability, the contacts are prone to aging, and the life is short. The speed regulation switches of different fan models are usually not universal.

The purpose of this utility model is to design a novel universal fan speed regulating electronic switch, which can be applied to any type of fan. It not only has the function of stepless speed regulation, but also has the functions of timing, digital display and simulating natural wind.

The utility model includes a speed regulating switch shell with a power switch and an electronic circuit with a power supply circuit and a silicon detectable trigger circuit. The light-emitting diode of the natural wind function state, the nixie tube that can display the size of the speed regulation and the timing value, the electronic circuit has a micro-controller and a grid voltage zero-crossing detection circuit and a display circuit controlled by the micro-controller.

The microcontroller used in the utility model can be the 68HC05 series microcontroller (MCU) of Motorola Company.

The utility model replaces electric appliances and mechanical parts with electronic parts and has no rotating parts, which reduces possible failures caused by poor contact and improves the reliability of the speed regulating switch. Use one integrated circuit chip to complete the control and adjustment of speed regulation, timing, and simulated natural wind, saving energy. It can be applied to any type of electric fan, and can also be used for lighting adjustment.

The following drawings can further illustrate the structure and function of the present utility model.

Fig. 1 is a circuit diagram of the utility model, and Fig. 2 is a design drawing of a shell panel.

There are 5 dotted boxes in Figure 1, 1 of which is a 5-volt power supply circuit, which generates 5 volts and supplies power with 150 mA DC current. 2 is the grid voltage zero-crossing detection circuit, which rectifies the 50-cycle, 5-volt AC sine wave into a 100-cycle half-sine wave, and each half-wave cycle is 10 milliseconds. It is connected with the microcontroller 6, and the microcontroller can detect grid voltage overshoot Zero moments. 3 is a display circuit, including a digital tube 7 for displaying the speed level and timing length, and four light-emitting diodes 8, 9, 10, 11. 4 is three buttons, 12 is the function button F, 13 is the up button ↑, and 14 is the down button ↓. 5 is a thyristor trigger circuit. The positive pulse output by the microcontroller 6 is amplified by a silicon PNP transistor 15 to trigger the thyristor 16 to conduct it, and the fan motor 17 (M) is energized to run. 18 is a power switch.

Fig. 2 is a design diagram of the shell panel of the universal speed regulating switch of the fan of the present invention. The lower right corner in the figure is the power switch corresponding to 18 in Fig. 1 . The upper part is the nixie tube corresponding to 7 in Fig. 1 and the light-emitting diodes corresponding to 8, 9, 10, 11 in Fig. 1 . The bottom is three buttons, namely 12, 13, 14 among Fig. 1.

With reference to Fig. 1, can illustrate the operating principle of the present utility model. After the power is turned on, the micro-controller immediately checks the function button F (12). Each time the function button is pressed, it enters four function adjustment states of speed regulation, short timing, long timing and simulated natural wind. Diodes 8, 9, 10, 11 are shown. When the function button is pressed for the fifth time, it returns to the speed regulating state. In each function adjustment state, the microcontroller then queries the up or down button 13,14. The relative value of rise and fall is displayed by the digital tube 7, and under different function adjustment states, it shows the speed of the fan, the short timing of 0-90 minutes, the long timing of 0-9 hours and the change of different simulated natural winds. When the function button shows the state of speed regulation, the microcontroller will enter the zero-crossing detection of the power grid after querying the function button and the up and down buttons. Finally, the microcontroller outputs a pulse to trigger the bidirectional thyristor 16, and the fan motor M (17) is energized to run. The period of the trigger pulse corresponds to the half-wave period of the grid voltage, which is 10 milliseconds, that is, it is triggered every 10 milliseconds. The maximum value of time τ is also 10 milliseconds, and the up and down buttons adjust the size of τ. When τ is zero, that is, all 220 volts of AC voltage is added to the fan motor, and the fan runs at full speed. When τ = 5 milliseconds, only 110 volts of AC voltage drives the motor, and the fan speed slows down to achieve the purpose of speed regulation. Figure 3 shows the pulse sequence in the state of fan speed regulation. In the figure, Up2 is the trigger pulse, and Up1 is the 5-volt half-wave AC signal of the grid zero-crossing detection circuit. The time delay between the leading edge of the trigger pulse Up2 and the zero point of Up1 is τ, and Up3 is 220 V AC grid voltage peak value, the shaded part of Up3 is the voltage applied to the motor M.

When the function button 12 is in the timing adjustment state (short timing, long timing), the microcontroller reads the timing value according to the up and down buttons 13 and 14 . At the moment when the grid voltage crosses zero, the microcontroller starts counting, and the time interval between two zero crosses is 10 milliseconds. Count once every time the detection voltage crosses zero. Comparing the counting time with the timing value, when the difference is zero, the triggering of the thyristor 16 is stopped, and the fan stops.

When the function button 12 is in the state of simulating natural wind, the micro-controller automatically changes the time τ from the moment when the grid voltage crosses zero to the time τ when the trigger pulse is sent according to the selection of the up and down buttons, that is, the micro-controller automatically executes different The program adjusts the voltage applied to the fan motor, changes the fan speed and duration, and makes the wind speed follow the selected law (selected by the up and down buttons) in the determined wind speed range in the speed regulation state to simulate natural wind.

Claims (3)

1, the general speed-regulating switch of a kind of fan, the electronic switch that the control supply power voltage is regulated fan motor speed and provided time-program(me) to select is provided, comprise the speed-regulating switch shell of charged source switch and power circuit is arranged, the electronic circuit of thyristor gating circuit, the housing face-plate that is characterised in that of the present utility model is provided with function button, the rise and fall button, show speed governing respectively, regularly, the light-emitting diode of natural wind simulating functional status, can show the speed governing size and the charactron of numerical value regularly, microcontroller be arranged in the electronic circuit and be subjected to the line voltage zero cross detection circuit and the display circuit of microprocessor controls.

2, by the described speed-regulating switch of claim 1, it is characterized in that said microcontroller is the 68HC05 Series of MCU of motorola inc.

3, by claim 1 or 2 described speed-regulating switchs, it is characterized in that said timing function has short timing in 0-90 minute and two kinds of selection modes of long timing in 0-9 hour, each is by a diode displaying.

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