JPH0323760B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for an electric fan.

Once a conventional electric fan is set to oscillate, it continues to oscillate indefinitely, regardless of whether someone is present or not, unless the fan is stopped. Therefore, if you forget to turn off the electric fan, it will remain in operation even when no one is present, which wastes power and causes wear and tear on the electric fan.

The present invention has been made in view of these conventional problems, and aims to provide an electric fan that can eliminate waste of electric power and is less likely to wear out.

The present invention will be described in detail below with reference to the illustrated embodiment.The illustrated control device detects the presence or absence of a person when the electric fan is oscillating, and if a person is present, the control device detects the presence or absence of a person at a certain angle with respect to the person. Then, after a certain period of time has elapsed after the movement at the sensing position, a new normal swinging movement is performed again, and even after a certain period of time has elapsed. If no person is detected, the fan will automatically turn off.
Sensor section 1, swing/power control section 2,
Swing drive section 3, system section 4, and electric fan circuit 5
etc. The sensor unit 1 includes an infrared sensor 6, an amplifier 7, an AC-DC converter 8, a comparator 9, a reference voltage generator 10, etc., and the infrared sensor 6 detects the presence or absence of a person.
It is configured to send a sensing signal to the swing/power control unit 2 if a person is present, and is designed to use a comparator 9 to prevent malfunctions, etc., and apply a reference voltage to it to determine only the human body. has been done. The swing/power control section 2 includes a relay drive circuit 11, a switch 12, and a keep relay 1.
3. It is equipped with first and second counters 14, 15, a time control section 16, a time limit setting device 17, and a reset switch 18, and controls the sensing signal emitted from the sensor section 1, converting it into a necessary signal, and It is configured to be sent to the swing drive section 3 and system section 4. The first counter 14, time limit setting device 17, time control section 16, switch 12, and keep relay 13
, the sensing signal from the sensor section 1 causes the first
Swing motor control circuit 2, which will be described later for the set time
A first control means is configured to operate the oscillating motor control circuit 20 and, after a first set time has elapsed, to cancel the operation of the oscillating motor control circuit 20 to perform a normal oscillating operation.

Also, a second control means for stopping the operation of the electric fan by the second counter 15 and the time limit setting device 17 when the sensor unit 1 does not detect the presence of a person within a second preset time. is configured.

Note that the second set time is set longer than the first set time in order to ensure the time during which the normal swinging motion can be performed after the first set time elapses. The swinging drive unit 3 includes a swinging motor 19, a swinging motor control circuit 20, and a swinging angle switching switch 21, and swings within a certain range around the human body according to a signal issued from the control unit 2. It is used to perform movements and return to normal swinging movements. The system section 4 includes a relay 22, a system switch 23, and a power supply circuit 24.
The electric fan circuit 5 is turned off, and when this automatic control is not used, the control system can be canceled by turning off the system switch 23.

The infrared sensor 6 is placed at the center of the drive blade cover, and detects the presence or absence of a person by receiving infrared rays in one direction from that position. This infrared sensor 6
After the output is amplified into a rectangular wave by an amplifier 7, the rectangular wave is exchanged into a DC output by an AC-DC converter 8. The comparator 9 compares the magnitude relationship of the DC output Ei of the AC-DC converter 8 with the reference voltage ER of the reference voltage generator 10, and when the amount of infrared sensing by the infrared sensor 6 exceeds a predetermined value,
In other words, when someone is present, comparator 9 is “L” (low).
Outputs a level signal. When the output of the comparator 9 is "L", the relay drive circuit 11 turns on the keep relay 13, sets the first counter 14, and resets the second counter 15.
When the keep relay 13 is turned on, the swing motor control circuit 20 sets the center position of the swing angle of the electric fan. On the other hand, the user can set the swing angle of 0°, 50°, and 100° using the swing angle changeover switch 21, and the swing motor control circuit 2
An appropriate swing angle can be selected from the position set at 0. The swing motor 19 is driven by the outputs of the swing motor control circuit 20 and the swing angle changeover switch 21. When the first counter 14 is set, the time setting device 17
The first counter 14 counts for the first set time set in , and when the first set time is over, the first counter 14 issues an output signal, and the keep relay 13 and time control section 1
Enter 6. Then, the keep relay 13 is reset by the output signal issued from the first counter 14, the swing motor control circuit 20 is turned off, and the swing motor 19 returns to normal operation. Further, the signal output by the first counter 14 enters the time control section 16, and from this signal, a signal of the third set time is transmitted to the switch 12 and the first counter.
Enter counter 14. And switch 12
By entering the switch 12, the switch 12 becomes open, the signal entering the keep relay 13 is cut off, and the keep relay 13 becomes inactive. The output signal of the time control unit 16 is input to the first counter 14, and while this signal is being input, the first counter 14 is in a reset state. In other words, the normal swinging motion is performed once or twice.
By cutting off the signal from the sensor unit 1 from entering the motor control circuit 20 for the repeated time (third set time) and performing the normal swinging motion, it will follow the movement of the person. I'll do what I do. When the time control section 16 stops emitting an output signal, the switch 12 returns to the on state, and the first counter 14 becomes ready for counting. The signal output from the relay drive circuit 11 resets the second counter 15, but when the output signal from the relay drive circuit 11 is not generated, the second counter 15 resets the time setting device 1.
Start counting by 7. When a second set time, which is longer than the first set time, is counted, the second counter 15 issues a signal to turn off the relay 22. When the relay 22 is turned off, the power to the electric fan is automatically turned off and the electric fan is stopped. When the system switch 23 is turned off, the system is turned off and returns to normal operation. Pressing the reset switch 18 will reset the system.
When this system is newly activated, the power is also turned on.

Although the embodiment has been described with reference to the swinging motion, other simple starting and stopping operations can also be performed.

As is clear from the above description, according to the present invention, the presence or absence of a person is sensed by the center part, the electric fan is driven by the sensing signal from this sensor part,
The second control means stops the operation of the electric fan when there is no sensing signal within a certain period of time, so it is possible to prevent the fan from forgetting to stop, which is the case in the past, and eliminates wasteful power consumption. Durability can be improved.

In addition, when the first control means moves at the sensing position and the first set time has elapsed, the normal swinging motion is repeated and the presence or absence of a person is sensed, so when a person moves in the room. However, after the first set time has elapsed, air can be blown again to the person who has moved, and the air will automatically follow the person without the person having to manually change the swing movement.
Comfort can be improved.

[Brief explanation of drawings]

The drawing is a block diagram showing one embodiment of the present invention. 1: Sensor section, 2: Swing/power control section, 3: Swing drive section, 4: System section, 5:
Fan circuit, 6: Infrared sensor, 14, 15:
First and second counters, 19: Swing motor, 20: Swing motor control circuit, 21: Swing angle switching switch.

Claims (1)

[Scope of Claims] 1. A sensor unit that detects the presence or absence of a person by oscillating the sensor in accordance with the oscillation of the electric fan, and a motor for regulating the normal oscillation and swinging the fan in the direction of the presence of the person. a swinging motor control circuit that operates the swinging motor control circuit; and a swinging motor control circuit that operates the swinging motor control circuit for a first preset time when the sensor unit detects the presence of a person; a first control means for canceling the operation of the swinging motor control circuit to perform normal swinging motion; and when the sensor section does not detect the presence of a person within a second preset time period; , and a second control means for stopping operation of the electric fan, wherein the second set time is set longer than the first set time.