KR900003718B1 - Electric blower - Google Patents

Abstract

The system is operated automatically according to the approaching distunce of a person. When the person approaches within a certain radius from the fan, an infrared transmitter receiver (1) placed in front of the fan senses the approaching state and turns the fan speed to high. When the person approaches too colse to the fan, it stops the operation. From the start to the stop, the fan speed is controlled according to the approaching distance of the person.

Description

Fan automatic operation device

1 is a block diagram of the present invention.

2 is a waveform diagram of each part of FIG.

* Explanation of symbols for main parts of the drawings

1 Infrared Reflection Sensor Part 2 First Amplifier

3: clipper 4: second amplifier

5: low pass filter 6: first level comparator

7: Off / set adjustment circuit 8: Triangle wave generator

9: second level comparator 10: motor drive unit

11: motor

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic driving device of a fan, and more particularly, to an automatic driving device of a fan that starts automatically when a person approaches within a certain distance and automatically decelerates as it approaches, and automatically stops when approaching a shortest distance. .

Conventionally, in order to manipulate the operation and wind speed of a fan, for example, a multi-step wind speed control switch such as start / stop, breeze, weak wind, strong wind, and natural wind is provided to allow a user to manually select and operate the fan. Therefore, in order to operate / stop the fan or change the wind speed, not only was it inconvenient to operate the wind speed control switch installed on the seat of the fan, but also to leave the fan on when leaving for a while due to such inconvenience. There was a case of unnecessary power waste. In addition, although the wind speed control switch is designed to be operated by hand, the wind speed control switch knob is easily broken because some users are forced to operate it with a foot to control it at a distance.

An object of the present invention is to solve the problems of the prior art, to provide an automatic driving device of a fan that can automatically perform a function such as start / stop, wind speed control, safety devices by detecting the approach distance of a person. It is.

In order to achieve the above object, the present invention provides an infrared reflection sensor unit for detecting the degree of human approach, a control unit for controlling the fan by starting / stopping, wind speed control and safety stop by amplifying and comparing the output of the sensor, and the control unit. Characterized in that the motor drive unit for driving the motor in accordance with the output signal of the.

In order to help the understanding of the present invention will be described in more detail through one embodiment shown in the accompanying drawings.

1 is a circuit diagram of an embodiment of the present invention, the infrared reflection sensor unit 1 and the light receiving unit of the infrared reflection sensor unit 1, which is installed at the front of the fan and is connected to the oscillator 12 for generating light at a constant frequency. A first amplifier (2) for amplifying the optical conversion output, a clipper (3) for passing only the positive (+) output of the first amplifier (2), and a second amplifier for amplifying the output of the clipper (3) (4), a low pass filter 5 for converting the output of the second amplifier 4 to a direct current level, and a direct current level of the low pass filter 5 is detected to trigger a triangular wave generator 8 described later. A triangular wave generator 8 triggered by the first level comparator 6 and the first level comparator 6 to generate a triangular wave having a constant lower limit value and an upper limit value, and a DC level and a triangular wave of the low pass filter 5; A second level comparator 9 for comparing the triangular waves of the generator 8 and outputting a pulse width modulated signal; By using the pulse width modulation signal of the second level comparator 9 as a gate signal to the motor driving unit 10 having a silicon rectification control element such as triac, for example, to control the AC power supply to the motor 11. Configure. The above-described infrared sensor unit 1 may also be configured as an ultrasonic sensor. Further, the first amplifier 2 or the second level comparator 9 may be configured by a microprocessor method using an A / D converter as an input terminal. In addition, the first level comparator 6 includes an off / set adjustment circuit 7 to set the fan start timing according to the distance by adjusting the trigger timing of the triangular wave generator 3. Reference numeral 20 is a fan.

The operation and effect of the present invention configured as described above will be described with reference to FIG. When the fan 20 according to the present invention is placed in a suitable place and the power switch not shown is turned on, the fan 20 is modulated by the frequency of the oscillator 12 in the light emitting part of the infrared reflection sensor unit 1 installed at the front of the fan 20. Infrared light is emitted. Infrared light reflected by an object outside a certain distance is received by the light receiving unit, but the power is weak, so that the triangulation generator 8 cannot be triggered. When a person reaches within a predetermined distance set by the off / set control circuit 7 of the first level comparator 6, the light conversion signal force received by the light receiving unit of the infrared reflecting sensor 1 is increased so that the first level comparator ( The output of 6) is switched to the high level state, and thus, the triangular wave generator 8 is triggered, and in the second level comparator 9, the output level of the triangular wave generator 8 input is the output level of the low pass filter 5 (the first level). Since it is higher than 2 degrees Ea), a high level signal is output and applied to the motor driver 10, for example, to a triac gate terminal, so that the entire cycle of AC (second degree G) is supplied to the motor 11, and the motor 11 The fan 20 is started and driven by a strong wind. As a person approaches the fan 20, the output signal of the infrared reflection sensor unit 1 increases from the b wave in FIG. 2A to the c wave and is amplified as shown in FIG. 2 through the first amplifier 2. In the clipper 3, only the positive output is passed as shown in FIG. 2C, and is amplified in the second amplifier 4 as shown in FIG. 2D, and then, through the low pass filter 5, b in FIG. is converted to level c. The DC level converted in this way is compared with the triangular wave (FIG. 2E-e) and appears at the output terminal of the second level comparator 9 as the b and c signals of FIG. Therefore, the closer the person approaches, the narrower the output pulse width of the second level comparator 9 is. The output pulse width determines the triac conduction angle of the motor driver 10, and thus the conduction angle of the tri-film becomes smaller. Since the AC power is reduced from I to 2 in FIG. H, the wind speed of the fan is decelerated and gradually adjusted from a strong wind to a breeze.

When a person approaches close enough to reach the fan's safety net, the optical conversion force is further increased, and the DC conversion level (E level d) is higher than the upper limit of the triangular wave so that the output signal of the second level comparator 9 goes to the low level. Since it is maintained, the triac of the motor drive unit 10 is cut off and the AC power supply to the motor 11 is stopped. Therefore, the motor 11 can be stopped to prevent a safety accident.

As described above, according to the present invention, a fan is started by sensing a person's approaching distance and is automatically adjusted from a strong wind to a weak wind as it approaches, thereby eliminating the inconvenience of manipulating the fan wind speed control switch. In addition, since the wind speed is automatically adjusted according to the distance, there is an effect that you can always feel comfortable driving at a constant wind speed regardless of the distance. In addition, it stops automatically when you get very close, which has the advantage of preventing accidents of children. Also, even if you leave your seat for a while with the fan on, it will automatically detect and stop it, which can save unnecessary energy.

Claims (1)

An infrared reflection sensor (1) installed in the front of the fan (20) and emitting infrared rays at a constant frequency and receiving reflected infrared rays, a first amplifier (2) for amplifying the output of the sensor portion, and the amplified signal A clipper (3) for passing only positive (+) outputs, a second amplifier (4) for amplifying the output of the clipper (3), and a low pass filter (5) for converting this amplified AC output to a DC level A first level comparator 6 having an off / set adjustment circuit 7 for detecting the direct current level, a triangular wave generator 8 triggered by an output signal of the first level comparator 6, A second level comparator 9 for comparing and outputting the triangular wave and the DC level, and a motor driver 10 for controlling AC power supplied to the motor 11 by an output signal of the second level comparator 9; Combined fan automatic power supply.

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