JPH0224986A - Heating element controller for electric heating apparatus - Google Patents

Abstract

PURPOSE:To make the electrostatic capacity between both electrode belts dominant and suppress the effect of the earth capacity on both electrode belts by circulating the high-frequency current between both electrode belts with the electrostatic capacity between a pair of both electrode belts and detecting the presence of an object on a main body via the change of the high-frequency current at this time. CONSTITUTION:A heater wire is provided on the main body 1 of an electric carpet, a person on the main body 1 is detected by a signal line 2 used as a human body detecting means, the detected signal is inputted to a control circuit 5 via a detecting circuit 3 to control the heating of a heater 6. An oscillator 4 is driven by the pulse signal from the circuit 5, the high-frequency pulse voltage is periodically applied to the circuit 3, the high-frequency signal is circulated in the signal line 2, the detection signal of whether a person exists or not on the main body 1 based on the change of the current is outputted to the circuit 5. This main body 1 is constituted of a back material 21 and a front material 22, electrode belts 18 and 19 are pinched between the rear material 21 and the front material 22 like a heater wire 24, the electrode belts 18 and 19 are arranged in a net shape between the heater wires 24 apart from the alignment of the heater wires 24.

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention relates to an electric heater for electric carpets, blankets, bed sheets, etc., in which a signal line is attached to the main body of the heating device, and a high-frequency current is circulated through the signal line. The present invention relates to a heating element control device for an electric heating appliance that detects whether there is a person in the main body or not and controls the heating of the heater of the heating appliance.

Conventional technology Conventionally, this type of heating element control device was disclosed in Japanese Patent Application Laid-Open No.
No. 383 (hereinafter referred to as A), JP 60-129538
No. (hereinafter referred to as B), Japanese Patent Application Laid-open No. 138338/1983 (hereinafter referred to as C), etc. have been proposed.

In A, a first signal line is placed around the main body of the heating appliance, and a second signal line is placed in the center, and both signal lines are connected to the detected object on the heating appliance. The structure has a structure that exhibits a predetermined impedance change with respect to the object to be detected when there is a person (person) and when there is no person, and furthermore, the impedance of both signal lines changes depending on the presence or absence of the object to be detected. It is configured to be connected to circuit means that detects the difference in change and controls the heat generation operation of the heating appliance based on the detected output.

In B, there is a detection means that detects the presence or absence of a human body (object to be detected) based on impedance changes of a signal line arranged on the main body of the heating appliance, and a detection means that detects the presence or absence of a human body (object to be detected) by detecting a heating element arranged on the main body. This configuration includes a control means for controlling energization, and a reduction means for reducing the influence of ground impedance of the detection means.

In C, a main body includes a person detection means whose physical quantity changes when a human body is placed thereon, and a heating element, and detects whether a human body is placed or not according to the change in the physical quantity of the person detection means. and a control section that controls the temperature of the main body by a temperature setting means when the main body is placed, and controls the temperature of the main body so that the control temperature is lower than the control temperature when the main body is not placed.

In A and B, the means for detecting the presence or absence of a person uses a signal line attached to the main body, and detects by changing the impedance of the signal line, which changes depending on the presence or absence of a person.9 In both cases, the detection means This is a detection means that uses changes in capacitance (impedance) between the ground side of the electrical circuit that makes up the circuit and the signal line. The detection characteristics of the means for detecting the presence or absence of a person vary significantly depending on changes in the humidity of the heating appliance itself and differences in the ground capacity of the installation location, making it difficult to accurately detect the presence or absence of a person.

Therefore, in A, a first signal line and a second signal line are provided, and the presence or absence of a person is detected based on the difference in impedance change between the two.

In B, means for reducing the influence of the ground capacitance of the signal line is also used, such as attaching a conductive member such as aluminum foil to the floor side of the heating appliance main body.

In C, 1) a means for detecting a human body that changes the physical quantity between electrodes according to pressure is used, and when a human body is not placed, the control temperature is lower than the control temperature when a human body is placed. A feature of this invention is that the main body temperature is controlled.

Problems to be Solved by the Invention The above heating element control device had the following problems.

(1) The detection characteristics of the human body detection means in A and B are affected by changes in the humidity of the heating appliance itself and differences in the installation location. In order to avoid this, it is necessary to have a means to reduce the influence of the ground impedance of the signal line attached to the main body. Additional measures such as combined use are essential, which increases costs.

(2) The human detection means in C cannot distinguish between a human body and an object, and when a kotatsu, table, etc. is placed on the heating appliance, it causes a malfunction, which is not practical.

(3) As the control means for the heating element in A and B, an embodiment is shown in which the power supply to the heating element is controlled simultaneously based on the output of the human detection means. Errors cannot be identified and reliability is poor. Furthermore, even if you leave your seat for a short while, the energization control of the heating element will immediately respond, causing the temperature of the main unit to drop, resulting in an unfavorable result for comfortable heating.

(4) As the heating element control means in C, A and B
Similarly, the output of the human detection means is used to control the energization of the heating element at the same time, but in this case, the proposal is to make the control temperature in the state where no human body is placed lower than the control temperature in the state where the human body is placed. It is passive in terms of not wasting power consumption, and has little power saving effect.

(5) When preheating a heating appliance to a predetermined temperature, there are many cases where no one is on the heating appliance. In this case, C is not preferable in terms of comfortable heating because it is preheated at a temperature lower than the predetermined temperature. Furthermore, in the cases A and B, the person detection means outputs an output during preheating, which may cause a problem in that the preheating is interrupted.

Means for Solving the Problems The present invention has been made to solve the above problems, and includes attaching a pair of electrode strips to a main body equipped with a heater, and connecting the electrode strips (or A resonant circuit is constructed between these image electrode bands as part of the resonant circuit, and a high-frequency circuit is constructed with the resonant circuit as a load, and the current (or high-frequency pulse current) supplied to the high-frequency circuit is
It is equipped with a detection circuit that controls the heating of the heater based on the presence or absence of an object on the main body, which is detected by changes, and on the other hand, the electrode strip is formed into a mesh-like parallel line, and the outer material and lining of the main body that hold the heater wire are connected. The heater wire is fixed in between, avoiding the attached part of the heater wire, and furthermore, the heater is heated by the output from the detection circuit, which is connected to the detection circuit and output after the temperature of the main body reaches a predetermined temperature. The time measurement that starts when the output is accepted stops powering the heater after a predetermined period of time has elapsed, and if the pulse signal that is output from the detection circuit when detecting the presence or absence of an object is output multiple times in succession, and a control circuit that recognizes "absence".

By doing this, high frequency current is circulated between the pair of picture electrode strips due to the capacitance between the pair of picture electrode strips.

At this time, due to changes in the high-frequency current (when there is an object, such as a human body, on the main body, the C component increases due to the capacitance of the human body, and the high-frequency current changes greatly compared to when it is not), the main body Since the presence or absence of an object above is detected, the capacitance between the image electrode strips becomes dominant, suppressing the influence of ground capacitance on both electrode strips.

Furthermore, since the presence or absence of a sensing object on the main body is detected using a high-frequency current, the presence or absence of an object can be clearly detected by satisfying the resonance condition.

Furthermore, the first wave OF, which energizes the heater via the control circuit,
The detection circuit is activated after F is recognized to reduce the influence of moisture between the picture electrode strips at the initial stage of energizing the heater, and when heating an electric heater, the detection circuit is activated until preheating is completed. lock.

Also, when the detection circuit obtains an output number that satisfies a predetermined condition (for example, when it recognizes that there is no sensing object),
Since the movement of the object is being sensitively sensed, the power supply to the heater is stopped after a predetermined period of time has elapsed after starting the timing operation.

Embodiment FIG. 1 shows an outline of a heating element control device for an electric heating appliance according to an embodiment of the present invention.

In the figure, 1 is the main body of, for example, an electric carpet.A heater wire (not shown) is attached to the main body 1, and a person can sit on the main body 1 to keep warm. Reference numeral 2 denotes a signal line of the human detection means, and a pair of parallel electrode bands are arranged inside the main body 1. A signal on the signal line 2 is inputted to a control circuit 5 via a detection circuit 3, which will be described later, to control the heating of the heater 6.

4 is an oscillator, which is driven by a pulse signal from the control circuit 5 and periodically applies a high frequency pulse voltage to the detection circuit 3;
This is to circulate a high frequency current to the signal line 2. The detection circuit 3 detects whether there is a person on the main body 1 based on the change in the current, and outputs it to the control circuit 5.

FIG. 2 shows the configuration of the control circuit 5 in FIG. 1.

In the figure, 7 is a microprocessor, which has an input control function that reads the outputs of the key switch 8 and the detection circuit 3, and an A/D conversion function that reads the temperature of the main body and converts it A/D. Arithmetic function for arithmetic processing and oscillation circuit 4
．． It has an output control function that sends a control signal to circuit elements (not shown) connected to the output terminal side, such as the relay 11, indicator light 12, and buzzer 13. 10 is a clock oscillation circuit.

The key switch 8 is a group of switches for commanding temperature setting or starting, and the indicator light 12 and buzzer 13 have a display function to indicate the state of energization to the main body. relay 1
A heater 6 is connected to 1, and the heating of the heater 6 is controlled.

FIG. 3 shows the configuration of the detection circuit 3 in FIG. 1.

In the figure, 14 is a coil for efficiently passing current through the signal line 2, and is connected in series with the signal line 2.

A series resonant circuit is configured by the L component of the coil 14 and the C component of the signal line. 15 is a voltage dividing resistor, 16 is a comparator, and 17 is a reference potential portion thereof.

Further, Vc and Vs indicate a reference potential and an input signal potential, respectively. The output Ns of the comparator 16 is the number of times Vs has fallen below Vc, and the number Ns is input to the control circuit 5.

FIG. 4 shows how the signal line 2 attached to the main body 1 in FIG. 1 is wired.

In the figure, 18 is an electrode band A, and 19 is an electrode band B, and these electrode bands A18 and B19 form a pair to form one signal line 2. Reference numeral 20 indicates a part of the controller including the control circuit 5 and the like.

The electrode bands A1g and B19 are arranged in a mesh pattern on the main body 1 so as to form parallel lines, and one end of each is connected to the controller part 20, and the other end is an open end.

FIG. 5 shows a sectional view of the main part of the main body.

In the figure, the main body 1 consists of two bodies, a lining 21 and an outer material 22, and the electrode bands A18 and B19 are held between the lining 21 and the outer material 22 in the same manner as the heater wires 24, and are fixed to the main body 1. Further, the electrode bands A1g and B19 are arranged in a net shape on the main body 1, as described above, in the middle between the heater wires 24, avoiding the area where the heater wires 24 are arranged. 23 indicates a decorative cover.

FIG. 6 shows an example of human detection characteristics using the main body equipped with the human detection means configured as shown in FIGS. 4 and 5 and the detection circuit shown in FIG. When there is no person on the main body, a solid line indicates, and when there is a person, a broken line indicates the change in the input signal Vs with respect to the frequency f in each case. Since both constitute a series resonant circuit by the L component of the coil 14 and the C component of the signal line 2, they have a resonant frequency of 51.82.

It is necessary to select the reference potential VC in a range where Vs is higher when there is no person than when there is no person, and in the example, f in the figure is used.
The value of Vs at c is defined as Vc. Furthermore, the frequency of the oscillator 4 is set to a resonance frequency (2) when there is a person present, at which the difference in Vs between when one person is present and when there is no person is large.

FIG. 7 shows a flowchart of the control circuit 5 of FIG.

The operation of this embodiment will be explained below according to a flowchart.

First, when starting to use an electric heating device, first set the temperature scale (not shown) related to the desired heating temperature, and then press the start button from the key switch 8. The heater wire 24 is energized, and the main body 1, heating is started.

At this time, the microprocessor-7 reads the temperature of the main body 1, and the temperature Ts of the main body 1 is the set temperature Tc set on the temperature scale.
When it exceeds the temperature, the heating of the main body 1 is stopped and
It is recognized that the wave is OFF, that is, the preheating of the main body 1 has been completed. Temperature control continues.

Subsequently, pulse oscillation is started upon recognition of the first wave OFF, and the oscillator 4 is operated by transmitting a pulse signal about once every few seconds.

Furthermore, the detection circuit 3 is started by the operation of the oscillator 4, and a detection output Ns is outputted from the detection circuit 3. The microprocessor-7 reads the detection output Ns and sets it to a preset reference value Nc.
When the detection output Ns exceeds the reference value Nc, it is recognized that there is no person on the main body 1.

Further, after recognizing that there is no one on the main body 1, time measurement is started via the clock oscillation circuit 10, and after a predetermined time tc has elapsed, the power supply is turned off. Here, the predetermined time tc is set to about 20 minutes based on the condition that the user leaves his/her seat for a short time.

In this way, the power is turned off only after the above series of program steps are completed, but in case someone returns during the process,
If each process is not completed, the flow is returned to the previous process as shown in FIG. 7 to prevent the power from being turned off unnecessarily.

Effect of the invention According to the present invention, the following effects are achieved.

(1) Since a pair of electrode strips is used as a means of detecting whether there is a person on the main body, it is possible to detect that the capacitance between the electrode strips is more dominant than the capacitance between the electrode strips and the ground, and Since the high-frequency current is circulated between these electrode bands as a load, the high-frequency current reacts more sensitively to the presence or absence of people than the commercial frequency current, so the operation is reliable and reliable. Detection becomes possible.

(2) The detection circuit that detects whether there is a person on the main body has a coil component added, and a resonant circuit is formed between the coil and the electrode band, and the high frequency current changes the resonance characteristics of the circuit. Since an appropriate amount of current is passed between the electrode strips using the sensor, it is possible to detect people while reducing the influence of disturbances such as external noise.

Furthermore, since the frequency of the high frequency circuit for human detection is set to the resonance frequency when a person is present, the significant difference between when there is a person and when there is no person becomes significant, making it possible to provide reliable human detection.

(3) Since the pair of electrode bands constituting the signal line form parallel lines and are arranged in a mesh pattern on the main body, it is possible to detect whether a person is present or absent from any part of the main body.

Furthermore, since the electrode strip is sandwiched between the lining material that holds the heater wire and the outer material, it is possible to provide an inexpensive person detection means with a simple sandwiching structure.

(4) The control circuit reads the temperature of the main body and does not accept the output of the person detection means until the preheating of the main body temperature is completed.
The power will not turn off during preheating.

Therefore, there is no self-contradiction such that preheating cannot be completed without someone present even during preheating.

After preheating, you can get comfortable warmth.

Furthermore, by preheating one main body, the influence of moisture on the signal line can be reduced, and reliability can be improved.

(5) Since the oscillation circuit oscillates with a pulse signal of a constant period, the heat capacity of the high frequency circuit can be reduced, which not only allows for an inexpensive configuration, but also reduces radio wave interference that accompanies high frequency oscillation.

(6) Since the detection circuit outputs the output of whether there is a person present or not as a pulse signal (detection output), even if the detection circuit malfunctions momentarily, the control circuit will not accept it, increasing the reliability of the system. can be increased.

In addition, even after recognizing that no one is present, the power will not be turned off until a predetermined period of time has elapsed, and even if you leave your seat for a short while, the temperature of the main unit will remain constant, allowing you to maintain comfortable heating.

(7) If the cooling unit is removed for a long time, the power will be automatically turned off.
This results in power savings.

As described above, the present invention provides a heating element control device for an electric heating appliance that operates reliably, is highly reliable, has a simple and inexpensive configuration, and has excellent heating comfort and FFI electric effect. be able to.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an outline of a heating element control device for an electric heating appliance according to an embodiment of the present invention. FIG. 2 shows a schematic control circuit diagram thereof, and FIG. 3 shows a detection circuit diagram thereof. FIG. 4 is a perspective view of the main body showing how signal lines are attached, and FIG. 5 is a sectional view of the main part of the main body. FIG. 6 is a diagram showing human detection characteristics, and FIG. 7 is a follow chart of the control circuit. 1...Main body, 3...Detection circuit, 5...
Control circuit, 6...Heater 18.19...
Electrode band, 21... Lining, 22... Outer material, 24...
heater wire.

Claims (9)

[Claims] (1) A pair of electrode strips (18) and (19) are attached to the main body (1) equipped with a heater (6), and a high frequency circuit is configured with the load between these electrode strips (18) and (19). and the heater (6) based on the presence or absence of an object on the main body (1) detected by the current change supplied to the high frequency circuit.
A heating element control device for an electric heating appliance, comprising a detection circuit (3) for controlling heating. (2) A resonant circuit is constructed between the electrode bands (18) and (19) as part of the resonant circuit, and a high frequency circuit is constructed with the resonant circuit as a load, and the sensor is detected by changes in the current supplied to the high frequency circuit. The heating element control device for an electric heating appliance according to claim 1, further comprising a detection circuit (3) for controlling heating of the heater (6) based on the presence or absence of an object on the main body (1). (3) outputting a pulse signal based on the presence or absence of an object on the main body (1) detected by a change in the high frequency pulse current supplied to a high frequency circuit whose load is between the electrode bands (18) and (19); The heating element control device for an electric heating appliance according to claim 1, further comprising a detection circuit (3) for controlling heating of the heater (6) based on the pulse signal. (4) The main body (1
) includes a detection circuit (3) that controls the heating of the heater (6) based on the presence or absence of an object on the electrode strip (18).
), (19) are arranged in a mesh-like parallel line. 2. The heating element control device for an electric heating appliance according to claim 1, wherein the wires are arranged in a mesh-like parallel line. (5) The main body (1
) includes a detection circuit (3) that controls the heating of the heater (6) based on the presence or absence of an object on the electrode strip (18).
), (19) to the main body (1) which holds the heater wire (24).
2. The heating element control device for an electric heating appliance according to claim 1, wherein the heating element control device is fixed between the outer material (22) and the lining material (21) of the heating element. (6) The main body (1
) includes a detection circuit (3) that controls the heating of the heater (6) based on the presence or absence of an object on the electrode strips (18), (19).
2. The heating element control device for an electric heating appliance according to claim 1, wherein the heater wire (24) is attached to the main body (1), avoiding the area where the heater wire (24) is attached. (7) A detection circuit (3) that detects the presence or absence of an object on the main body (1) equipped with a heater (6); 2. The heating element control device for an electric heating appliance according to claim 1, further comprising a control circuit (5) for controlling heating of the heater (6) based on the output from the detection circuit (3). (8) a detection circuit (3) that outputs a pulse signal when detecting the presence or absence of an object on the main body (1) equipped with a heater (6);
The electric heating appliance according to claim 1, further comprising a control circuit (5) connected to the detection circuit (3) and recognizing the "absence" of an object when the pulse signal is continuously output a plurality of times. Body control device. (9) A detection circuit (3) that detects the presence or absence of an object on the main body (1), which is equipped with a heater (6), and a detection circuit (2) that is connected to the 2. The heating element control device for an electric heating appliance according to claim 1, further comprising a control circuit (5) that starts timing and stops energizing the heater (6) after a predetermined period of time has elapsed.