JPH0142595B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to heating devices for sleeping such as electric blankets and electric bed blankets.

Conventional structure and its problems In conventional electric blankets, the temperature rise caused by the heat generated by the heater is detected as a temperature signal by the temperature detection wire placed on the entire surface of the electric blanket, and the temperature is controlled by controlling the heater current using the temperature control circuit. was. Furthermore, the temperature of the electric blanket was controlled by a variable resistance dial provided in the temperature control circuit. Therefore, people often feel uncomfortable because they are too hot or too cold due to inappropriate temperature settings on the dial, changes in outside temperature, drafts in the bedroom, and the weight and thickness of bedding. Also, if it's too hot, your body muscles will get tired, you'll sweat, your throat will dry out, and you'll feel even more uncomfortable.

FIG. 1 shows a configuration diagram of a conventional electric blanket.

In the figure, a string-like heater 2 and a temperature detection line 3 are provided on the blanket body 1, and a temperature signal from the temperature detection line 3 is applied to a temperature control circuit provided in a control box 4 to control the power supply to the heater 2, thereby generating electricity. The temperature of the blanket 1 is controlled.

Therefore, in this conventional electric blanket, when a person sleeps, the temperature detection line 3 detects both the temperature of the heater 2 and the temperature of the person as the average temperature of the entire blanket. , the temperature detection line 3 cannot detect a difference of 1 to 2 degrees Celsius in human body temperature when a normal blanket is placed between an electric blanket and a person, and the temperature is controlled by simply detecting the heat generated by the heater. The disadvantage is that it only does

OBJECTS OF THE INVENTION The object of the present invention is to eliminate the discomfort of the prior art, detect the temperature of the human skin, and obtain a more comfortable sleeping warmer.

Structure of the Invention The present invention provides a relay circuit for opening and closing the heater circuit in the heater circuit of a sleeping warming device body (hereinafter simply referred to as the warming device body) having a heater circuit,
A temperature control circuit is connected to the relay circuit, and the temperature control circuit includes a temperature sensor to be brought into contact with the skin, a comparison circuit connected to the temperature sensor, and an amplifier connected to the comparison circuit and operating the relay circuit, The comparison circuit compares whether the temperature of the skin is below or above the skin temperature set using the signal from the temperature sensor. The relay circuit is activated by a level signal to close and energize the heater circuit, and when the level signal is higher than that, the relay circuit is activated by a low level signal, and the heater circuit is opened and energization is stopped. do.

DESCRIPTION OF EMBODIMENTS FIG. 2 shows a configuration diagram of a heating device for sleeping according to the present invention.

In the figure, the same symbols as in FIG. 1 indicate the same parts. In the figure, 11 is a sleeping person, 12 is a control box containing a temperature control circuit, 14 is a temperature sensor, and 13 is a lead wire.

In the present invention, temperature sensors 14 are attached to the sleeper's feet, and lead wires 13 are connected to the temperature control circuit 12.

FIG. 3 shows a temperature control circuit according to the present invention.

In the figure, Q ₁ is a transistor, Q ₂ is a comparator, D ₁ and D ₂ are diodes, Dz is a zener diode, C ₁ is a capacitor, RL is a relay, RLC is a relay contact, R ₁ to R ₅ are resistors, and VR indicates variable resistance.

The configuration and operation of the temperature control circuit of the present invention will be explained.

A DC power supply is configured by a series circuit of a diode D ₁ and a resistor R ₁ in series, and a parallel circuit of a zener diode Dz and a capacitor C ₁ .

The comparator Q ₂ compares the voltages at points a and b determined by the resistance value of the temperature sensor 14, the resistance value of the fixed resistor R ₂ , and the values of the variable resistor VR and the fixed resistor R ₃ , and when the skin temperature is low, the comparator Q ₂ is set to a high level, inputs the base input to transistor _Q1 , makes it conductive, drives relay RL connected to the collector, closes contact RLC, and energizes heater 2. Also, when the skin temperature becomes higher than the set temperature, it goes to heater 2. It works to stop energization.

FIG. 4 is a diagram showing the skin temperature of the sleeper's feet. A indicates the temperature when an electric blanket is used, and B indicates the temperature when no heating equipment is used. As you can see from this figure,
Immediately after sleeping, the skin temperature of the feet is low at around 25℃, and as time passes under the futon, it rises as shown in (b) even without a heating device, but the skin temperature of the feet does not rise to the standard body temperature of 36℃. This indicates that you have difficulty falling asleep due to the cold.

Furthermore, when using an electric blanket, the skin temperature of the feet quickly rises to around 35°C, indicating that it is easier to fall asleep. The human body requires heat to be dissipated from the skin surface due to the human body's metabolic activities, so when it is heated to 36°C, heat dissipation to the outside is blocked, making people feel hot. The difference in skin temperature between the feeling of heat and the feeling of comfort is about 0.5°C.

In the present invention, this skin temperature is directly detected by a temperature sensor and the electricity supply to the electric blanket is controlled.
An electric blanket that can control skin temperature to about 0.5°C and is extremely comfortable to use can be obtained.

In the embodiment shown in FIG. 2 of the present invention, the temperature sensor 14 is provided at the tip of the foot where the skin temperature changes most easily, but it detects the skin temperature of the top of the foot, lower leg, back, shoulder, hand, arm, etc. You can also get the same comfortable temperature. Furthermore, when attaching the temperature sensor 14 to the human skin, using a mounting tool to keep it warmer than necessary will impede changes in the skin temperature. It's better to fix it.

An example is shown in FIG. In the figure, reference numeral 15 indicates a net-like band made of woven rubber, and a temperature sensing element made of a thermistor serving as a temperature sensor is fixed to the sole of the foot.

Effects of the Invention As described above, according to the configuration of the present invention, the temperature of the sleeping warming device is controlled by detecting the temperature of the human skin, so that it does not become too warm and cause sweating.
never tired. When the body gets cold, it is warmed by 100% electricity, which increases comfort by quickly warming the body.Also, when the body becomes warm, the electricity is immediately stopped, which is economical.

[Brief explanation of drawings]

Fig. 1 is a diagram showing a conventional sleeping warming device, Fig. 2 is a configuration diagram of an embodiment of the sleeping warming device of the present invention, and Fig. 3 is a diagram showing a temperature control circuit of the sleeping warming device of the present invention. Example diagrams, Figure 4 is a diagram showing changes in skin temperature, A is the curve when an electric blanket is used, B is the curve when no heating device is used, and Figure 5 is the temperature sensor of the sleeping warming device of the present invention. A diagram showing an example of fixing to a human body is shown. 1: Blanket body, 2: Heater, 3: Temperature detection line,
4, 12: Controller box, 11: Human body,
14: Skin temperature sensor, _Q1 : Transistor,
Q ₂ : Comparator, D ₁ , D ₂ : Diode, Dz:
Zener diode, _R1 to _R5 : Resistor, RL: Relay, RLC: Contact, VR: Variable resistor.

Claims (1)

[Claims] 1 A relay circuit for opening and closing the heater circuit is provided in the heater circuit of a sleeping warming device body having a heater circuit (hereinafter simply referred to as the warming device body), a temperature control circuit is connected to the relay circuit, and the temperature control circuit is It consists of a temperature sensor that is brought into contact with the skin, a comparison circuit connected to the temperature sensor, and an amplifier that operates the relay circuit connected to the comparison circuit, and the temperature control circuit is controlled by a signal from the temperature sensor. Compare whether the skin temperature is below or above the skin set temperature,
When the temperature is below the set temperature, a high level signal from the comparator circuit operates the relay circuit to close and energize the heater circuit, and when the temperature is above the set temperature, a low level signal operates the relay circuit to close the heater circuit. A heating device for sleeping, characterized in that it is configured to open and stop energization.