JPH02234379A - Floor heating device - Google Patents

Abstract

PURPOSE:To cut off the electric power feed to a heating tool when no person is present by cutting off the electric power at the time of time-up of a timer activated by a signal when the change of the oscillation frequency of an oscillation section changed according to the pressure is detected. CONSTITUTION:The electric power fed to a load 6 is cut off at the time of time-up of a timer activated by the signal of a frequency detection section 3 when the change of the oscillation frequency of an oscillation section 2 utilizing the capacitance of an object detecting means 1 changed according to the pressure is detected. If the oscillation frequency of the oscillation section utilizing the capacitance between electrodes of the object detecting means is changed when the pressure is applied on a heating tool main body, a timer is activated. If no change occurs for a fixed period, it is judged that no person is present, and the electric power feed to a heater wire can be cut off.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a floor heating device that is placed on the floor to provide heating. BACKGROUND OF THE INVENTION As shown in FIG. 7, a conventional floor heating device has a heater wire 25 disposed inside the heating device body and a temperature sensor disposed near the heater wire 25 to detect the temperature of the heating device body. A detection gland 26, a temperature setting section 27 for setting the temperature of the heater wire 25, an AC power supply section 28, a power switch 29 connected in series to the AC power supply section 28 and the heater wire 25, and a power control element 30 such as a relay. , the temperature obtained from the temperature detection line 26 and the temperature setting section 27
The temperature of the temperature detection line is compared with the temperature of the control unit 3 that drives the power control element 30 in the state of the temperature of the temperature setting unit.
1, and the user can set the temperature setting section 2.
7 and use the heating device to set the desired temperature. In the figure, 32 is a DC power supply section consisting of a transformer, diode bridge, capacitor, Zener diode, resistor, etc., a control section 31, a temperature setting section 27, a power control element 30
A predetermined DC voltage is supplied to the Problems to be Solved by the Invention However, in the configuration of the conventional example described above, once the user turns on the power switch and starts heating, the temperature is controlled at the temperature set by the temperature setting unit until the user turns off the power switch again. However, there was a problem in that power was wasted if the user temporarily stopped scanning due to an unexpected errand or if the user forgot to turn off the power switch. The present invention solves such conventional problems by detecting the presence or absence of a human body on the heating device in a floor heating device that is placed on the floor to collect heat. The purpose is to provide a floor heating system that cuts off the power supply to the installed heater wires. Means for Solving the Problems In order to solve the above problems, the floor heating of the present invention includes a pair of conductive electrodes, an object detection means with an insulating material interposed between the pair of conductive electrodes, and an object detection means that responds to pressure. an oscillating section that oscillates using the capacitance of the object detecting means that changes when the object detecting means changes; a frequency detecting section that outputs a signal when detecting a change in the oscillation frequency of the oscillating section; a timer that is activated by the signal from the frequency detecting section; It is equipped with a power control unit that cuts off the power supplied to the load when the timer expires. Effect With the above configuration, when pressure is applied to the body of the heating device, the distance between the electrodes of the object detection means provided inside the body of the heating device changes, and the capacitance of the object detection means changes in accordance with the change. If there is a change in the oscillation frequency of the oscillation unit, start the timer, and if there is no change in the oscillation frequency of the oscillation unit until the timer times out, check for movement or change in pressure on the heating device. It determines that no one is present when there is no one, and cuts off the power supply to the load or the feeder line. EXAMPLE Hereinafter, an example of the present invention will be explained based on the accompanying drawings. FIG. 1 is a block diagram showing an embodiment of the present invention. 1 is an object detection means in which the distance between electrodes changes when pressure is applied, and the capacitance changes in accordance with the change in the distance between the electrodes;
2 is an oscillation unit that oscillates using the capacitance of the object detection stage 1, 3 is a frequency detection unit that outputs a signal every time the oscillation frequency of the oscillation unit 2 changes, and 4 is counted by the signal of the frequency detection unit 3. A timer part 5 starts after resetting the value, and 5 is a power control part that cuts off power supply to the load in response to a time-up signal from the timer part. 6 is the load. Next, the object detection means will be explained using Figures 2 to 4 of the irises. FIG. 2 shows the configuration of the object detection means, in which 7 is a first electrode, and a strip-shaped insulator 9 is interposed between 8 and a second electrode. At this time, if the distance between the first electrode and the second electrode is 1 (m) and the area of the first and second electrodes is A (m), then the capacitance of the object detection means is C = a - A/1 ( F)
・”・It is expressed as (1). Also, by dividing the electrode area, A-A1+A2+A3+A4(m) ・−・・(
2), formula (1) becomes C-ε・AI/1+ε・A2/1+ε・A3/1+e
・A4/1 (m) ...=・It can be considered as (3). FIG. 3 is an equivalent circuit diagram of the object detection means of the present invention, and to simplify the explanation, the equivalent circuit is shown using four capacitors C1 to 04. FIG. 4 shows the situation when pressure is applied to the object detection means of the present invention. When pressure is applied, the distance between the first electrode 7 and a part of the second electrode changes, so that the object detection means is not detected. The capacitance of the entire means is CO-ξ・A I /11+ε・A 2 /12+ε・
A3/13+ε・A4/14(F)・・・・・・(
4) Compared to when no pressure is applied as expressed by equation (4). This will increase. The present invention detects the presence or absence of a human body by using the capacitance of the object detection means, which changes depending on the degree of pressure applied. Next, a method for detecting a human body using the above-mentioned object detection means will be explained using FIG. FIG. 5 is a control circuit diagram of one embodiment of the present invention. The frequency detection section 3, timer section 4, power control section 5, and the microcomputer 10
(hereinafter referred to as a microcontroller) and peripheral circuits. The microcomputer 10 shown here is a CPU-ROM-
It is a so-called one-chip microcomputer that has a RAM-A/D* conversion section and an input/output section. 11 is a capacitance that changes according to the pressure of the object detection means, and is represented as a variable capacitor in this embodiment; 12 is an inverter l;
CR composed of 5, resistor 16, and variable capacitor 1l
The CR oscillation circuit 12, which is an oscillation circuit and corresponds to the oscillation section 2, changes the oscillation frequency output to the microcomputer 10 when the capacitance of the capacitor 11 changes due to pressure. , restart the internal timer after resetting its count value. After that, repeat this operation every time the input frequency changes. In other words, while the object is moving on the heating device in which the object detection means is installed,
This means that the timer is constantly being reset and started. Furthermore, if an object moves on a heating device with an object detection means installed inside it, and the capacitance of the object detection means becomes constant, no change is observed in the oscillation frequency of the CR oscillation circuit, and the internal timer is reset. It disappears,
When the running timer times out, the microcomputer 10 outputs a signal (L in this embodiment) to turn off the transistor 11, turns off the relay 12, and cuts off the power supply to the heater 13, which is the load. 14 in the drawing is the DC power supply section, which includes a resistor 18, a Zener diode 19, a Heijun capacitor 20, a diode bridge 21, and a transformer 2.
2 and supplies a predetermined DC voltage to the microcomputer 10 and peripheral circuits. 23 is an AC power source, and 24 is a diode for absorbing back electromotive force generated in the relay coil.

Next, the processing of the microcomputer of the floor heating system configured as described above will be explained using the flowchart shown in Fig. 6. FIG. 6 is a flowchart in one embodiment of the present invention, and is a part of the flowchart for overall device control. First, in S1, the oscillation frequency output from the oscillation circuit is captured, and in S2, it is determined whether the captured frequency has changed. If it has changed, the internal timer is reset and restarted in S3, and all processing Terminate. If the frequency acquired in S2 does not change, it is determined in S4 whether the time has expired or not. If the time has not expired, all processing is finished, and if the time has expired, the relay is turned off in S5 and the load is In other words, the power supply to the computer is cut off. Effects of the Invention As is clear from the description of the embodiments above, the floor heating device of the present invention provides the following effects. When the frequency of the oscillation circuit does not change for a certain period of time, an object detection means whose capacitance changes according to pressure is used instead of a capacitor.
In order to judge that a person is not present and cut off the power supply to the heater, it is excellent at detecting furniture such as a kotatsu or TV and the human body even when the same pressure is applied, and the resistance value changes depending on the pressure. Compared to the case where a pressure sensor is used as a human body detection means, the detection sensitivity of the human body is significantly improved, and aluminum sheet is used instead of the electrode to even out the heat of the heater wire, which is often used in floor heating equipment. It is possible to provide a floor heating system that includes a human body detection means that is inexpensive, including the number of manufacturing steps, and has a high detection ability.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a floor heating system showing an embodiment of the present invention, Fig. 2 is a perspective view showing the configuration of an object detection means of the same floor heating system, and Fig. 3 is an equivalent circuit diagram of the object detection means. , Fig. 4 is a sectional view showing the situation when pressure is applied to the object detection means, Fig. 5 is a control circuit diagram of the same floor heating system, Fig. 6 is a flowchart of the same floor heating system, and Fig. 7 is a circuit diagram of the main parts of a conventional floor heating system. 1... Object detection means, 2... Oscillator,
3... Frequency detection section, 4... Part of timer, 5... Power control element, 6... Load. Name of agent: Patent attorney Shigetaka Awano Haka1 person 7...1st C slope 81 2nd/lt Kaki 1st, 3 γ...Ichina Ichi's wL pivot a--Ichikinji's Den' Hill 9.1.Sf! J-rimmono

Claims (1)

[Claims] a pair of conductive electrodes, an object detection means interposed with an insulator between the pair of conductive electrodes, and an oscillation section that oscillates using a capacitance of the object detection means that changes according to pressure; A floor comprising: a frequency detection section that outputs a signal when detecting a change in the oscillation frequency of the oscillation section; a timer that is activated by a signal from the frequency detection section; and a power control section that cuts off power supplied to the load when the timer times up. heating equipment.