JPS6329171B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention detects whether or not a person is using the Yagura Kotatsu, and when the Yagura Kotatsu is not in use, automatically shuts off (turns off) the power to the Yagura Kotatsu heater, thereby eliminating unnecessary power consumption and saving energy. This relates to a kotatsu that can be raised easily and reliably.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the Yagura Kotatsu of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the Yagura Kotatsu of the present invention is equipped with a heater 2 made of an infrared lamp, a nichrome wire, etc. for heating the inside of the Yagura Kotatsu 1, and a heater 2 for detecting the presence or absence of a user 3 inside the Yagura Kotatsu 1. A detection device 6 consisting of a sonic transmitter 4 and an ultrasonic receiver 5 is provided, and energization to the heater 2 is controlled based on a detection signal from the detection device 6.

In the above configuration, the detection device 6 is configured so that the ultrasonic receiver 5 receives ultrasonic waves from the ultrasonic transmitter 4 to detect the presence or absence of a user inside the kotatsu 1.

FIG. 2 is a block diagram showing the control circuit of the Yagura Kotatsu of the present invention. In FIG. A detection device formed by a sonic transmitter 4 and an ultrasonic receiver 5; 7 is an amplifier for amplifying the signal received by the ultrasonic receiver 5; 8;
9 is a comparator that compares the output signal of the amplifier 7 with a reference signal and outputs the result; 9 is a component that connects the comparator 8 and the user 3;
11 is a rectifier circuit such as a flip-flop circuit that rectifies the output signal of the AND gate circuit 9 into a DC signal. , 12 is an NPN transistor that operates according to the signal from the rectifier circuit 11 and controls the current of the relay coil 13a of the relay 13;
14 is a DC power supply that supplies current to the relay coil 13a of the relay 13; 15 is an AC power supply that supplies current to the heater 2 via the relay contact 13b driven by the relay coil 13a of the relay 13;
16 is a high frequency oscillator whose oscillation frequency is often set to the resonance frequency of the ultrasonic transmitter 4; 17 is a high frequency oscillator whose oscillation frequency is determined from the relationship with the distance at which the human body 3 is detected by the ultrasonic waves of the ultrasonic transmitter 4; A low frequency oscillator 18 is connected to the output end of the low frequency oscillator 17, and a differentiating circuit is made up of a capacitor 19 and a resistor 20. A differentiating circuit 21 is connected to the output end of the differentiating circuit 18 via a resistor 22, and an output An AND gate circuit 23 has one end connected to the input end of the window comparator 10, and the two input ends of the one shot are short-circuited. The input terminal is the above AND gate circuit 2
AND gate circuit connected to the output terminal of 1, 24
is a transmitter drive circuit for driving the ultrasonic transmitter 4, which connects the emitter of a PNP transistor 25 to a DC power supply 26 and connects its collector to the collector of an NPN transistor 27, and connects the emitter of the NPN transistor 27 to the ground and connects the collector to the DC power source 26. is connected to the ultrasonic transmitter 4, resistors 28 and 29 are connected to the bases of the respective transistors 25 and 27, and the resistors 28 and 29 are connected to the output terminal of the AND gate circuit 23. It is what it is.

Next, the operating state of the kotatsu of the present invention constructed as described above will be explained.

First, to explain the case where the user 3 is located on the Yagura Kotatsu 1 as shown in FIG. 1, the signal shown in FIG. The signal shown in FIG. The signal shown in c is derived. The signal at the output end of the AND gate circuit 21 and the signal at the output end of the high frequency oscillator 16 are input to the AND gate circuit 23.
The signal shown in FIG. 3d is derived at the output end of . The signal derived from the AND gate circuit 23 is applied to the input terminal of the transmitter drive circuit 24, and the ultrasonic transmitter 4 is activated by the alternate operation of the PNP transistor 25 and the NPN transistor 27 of the transmitter drive circuit 24.
is driven (vibrated), the ultrasonic transmitter 4 generates ultrasonic waves, and the ultrasonic waves are transmitted. If the user 3 is present within the distance (within the time) set by the window comparator 10, the ultrasonic wave reflected by the user 3 is received by the ultrasonic receiver 5. Then, the signal received by the ultrasonic receiver 5 is amplified by the amplifier 7 and appears as a signal X in FIG. 3f. In this case, the signal Y in FIG.
The signal Z in FIG. and the amplifier 7
X shown in FIG. 3 f above, derived from the output terminal of
The received signal including Y and Z is compared with the reference signal by the comparator 8, and the signal shown in FIG. 3g is derived at the output terminal. A window for delivering a signal to the output end within a certain period of time after the signal led to the output end of the comparator 8 and the signal shown in FIG. The signal at the output end of the comparator 10 (shown in FIG. 3e) is applied to the AND gate circuit 9, and the signal at the output end of the AND gate circuit 9 is applied to the output end of the AND gate circuit 9 within a certain period shown in FIG. Only the third range (i.e. time)
A signal of only X in Figure f is derived to the output terminal. The signal led out to the output terminal of the AND gate circuit 9 is rectified by the rectifier circuit 11 to become a direct current, and the signal shown in FIG. , the transistor 12 conducts (turns on) and the relay 13
A current from the DC power supply 14 is passed through the relay coil 13a of the relay 13, the relay contact 13b is closed by the relay coil 13a of the relay 13, and the heater 2 is energized from the AC power supply 15.

When the user 3 is no longer located in the Yagura Kotatsu 1 (the user 3 no longer exists) and is no longer used, the signal X in Figure 3 f is no longer derived from the output terminal of the amplifier 7, and therefore The signals shown in h and i in FIG. No current flows, the relay contact 13b by the relay coil 13a of the relay 13 is opened, and the current supply to the heater 2 from the AC power source 15 is cut off.

As described above, the presence or absence of a user of the canopy kotatsu 1 is detected, and when the canopy kotatsu 1 is not in use, the power supply to the heater 2 of the canopy kotatsu 1 is automatically cut off.

Since the Yagura Kotatsu of the present invention has the above-described configuration, wasteful power consumption when the Yagura Kotatsu is not in use can be avoided, and the power saving effect can be easily and reliably increased. Since the power supply to the Yagura Kotatsu's heater is controlled by detecting it inside the Yagura Kotatsu, the power supply to the Yagura Kotatsu's heater is not immediately controlled depending on the presence or absence of the Yagura Kotatsu user, but is controlled after a set time, and the Yagura Kotatsu's heater is controlled. The temperature inside the heater can be controlled gently, and the relay that controls the energization of the heater does not have to be opened and closed frequently, which can reduce the occurrence of failures.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing an embodiment of the kotatsu of the present invention, FIG. 2 is a block diagram showing a control circuit of the kotatsu of the invention, and FIG. 3 is an output waveform diagram of each part of FIG. 2. In the drawings, 1 indicates a kotatsu, 2 indicates a heater, and 3 indicates a user.

Claims (1)

[Claims] 1. A detection means for detecting the presence or absence of a user of the Yagura Kotatsu using an ultrasonic signal or the like within a set time and deriving a detection signal, and a control for controlling energization to the heater of the Yagura Kotatsu based on the detection signal of the detection means. A Yagura Kotatsu characterized by comprising means.