JP2000021554A - Controller for sheet-like heating element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an AC waveform control system controller for efficiently and economically adjusting a temperature of a sheet-like heating element having a PTC characteristic (a positive temperature coefficient) by changing a saturated stable temperature by changing an AC waveform by judging a change in a resistance value by manual operation (for example, rotation and sliding of a knob) by a phase control circuit. SOLUTION: A controller X1 has a phase control circuit I, and changes an AC waveform of AC 100 V from a power source by discriminating a change in a resistance value generated by manually rotating or sliding a knob (t) by the phase control circuit I to be supplied to a PTC heater H as a load. Thus, a saturated temperature of the PTC heater H can be freely changed, and thus, a preset temperature can be freely delicately controlled without turning on and off a switch to serviceably obtain a desired temperature for floor heating.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a controller for controlling the temperature of a planar heating element having PTC characteristics used for heating or the like.

[0002]

2. Description of the Related Art As a conventional heating method for heating a wide area, for example, an entire room, there is a floor heating method using a heating wire heat source system using a nichrome wire or the like. Otherwise, it will be too hot. Although such floor heating is used in direct contact with the human body, it is difficult to obtain a comfortable temperature, and therefore it is necessary to control the temperature. Of course, it is also necessary for safety. And as a control of this temperature,
It is common to set a desired constant temperature, cut off the current when the temperature exceeds the desired temperature, and re-energize when the temperature falls below the certain temperature. In such floor heating equipment,
There is a drawback that the temperature repeats up and down with a certain width, and in this case, the repeated turning on and off of the switch raises a problem that it is incompatible with power saving, energy saving, and even comfort.

[0003] Here, a PTC planar heating element [a heating element having a PTC characteristic (Positive Temperture Coefficient) on an insulating film (a carbon powder interposed in a synthetic resin material or the like), which is called a PTC heater]
The formed heater having a self-temperature control function]
The feature is that self-temperature control is relatively easy at a relatively low temperature (such as 45 ° C.). Therefore, it is safe to use it directly near the body, and is suitable for use as a foot mat, floor heating, and the like. In addition, a large amount of far-infrared rays are radiated by heating the carbon contained therein, and a comfortable heating space can be created. Also, because it has the above-mentioned PTC characteristics,
As the temperature approaches the desired set temperature, the current decreases and the power consumption decreases. Stably continuing this state achieves energy saving. Here, conventionally, an on / off controller is used to obtain such a desired temperature. However, this heater having a PTC characteristic has a sufficient degree of comfort and energy saving. It has not been done.

Further, the PTC sheet heating element has a low electric resistance in a low temperature state, and a large current (so-called inrush current) flows at the moment when the switch is turned on. If the inrush current is large, there is a risk that the electric circuit and the wiring may burn. In addition, since the existing safety device (breaker) having a small capacity is cut off, it is necessary to design an electric circuit according to the load at that moment, and an economic burden is imposed.
In other words, in order to cope with a large current that is needed instantaneously, it is necessary to change an electric circuit and a breaker or to change a power contract to a large capacity.

[0005]

The present invention relates to the above-mentioned PT.
Efficient temperature control of sheet heating elements with C characteristics
It is an object of the present invention to obtain an AC waveform control type controller that can be economically performed.

[0006]

In the temperature control of a planar heating element having PTC characteristics, a phase control circuit determines a change in resistance value or the like due to manual operation (for example, turning or sliding a knob). By changing the AC waveform and changing the temperature at which the saturation is stabilized, the controller for the planar heating element by the AC waveform control method, when the switch is turned on,
So that current starts to flow at zero voltage, and
Or, the voltage gradually increases with a predetermined time,
A controller for a sheet heating element according to the AC waveform control method described above, wherein the controller is set to a predetermined voltage.
In the temperature control of the planar heating element having the PTC characteristic, the temperature is measured, the phase control circuit determines the difference from the temperature set value, the AC waveform is automatically changed, and the current passing amount is adjusted. A controller for a sheet heating element based on an AC waveform control system, which automatically adjusts the temperature at which saturation is stabilized.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on embodiments with reference to the drawings. First, FIG. 1 shows a current waveform from a normal AC (100 V) power supply.
This is a state without a cut described later. Therefore, if the PTC heater is designed to be stable at a constant temperature, for example, a relatively low temperature such as 60 ° C. or 40 ° C., as shown in FIGS. After the energization is started by turning on, it is maintained near the constant temperature. Next, as a first embodiment of the AC waveform control type controller of the present invention, as shown in FIG. 3, a phase control circuit (I) is provided in the controller (X ₁ ), and the knob (t) is manually rotated. The phase control circuit (I) discriminates a change in resistance value or the like caused by sliding or sliding, and changes the AC waveform as shown in FIGS. 4 (a) and 4 (b). . For example, 100 V AC is supplied from the power supply to the controller (X ₁ ).
TC heater (H) is connected. FIG. 4A shows an example in which 50% of each waveform is cut, and FIG.
Is an example in which 70% of each waveform is cut. (c)
Indicates a cut portion. Thus, PTC heater (H)
As shown in FIGS. 4A and 4B, the saturation temperature can be freely changed by waveform control. As a result, the temperature setting can be freely and finely controlled without depending on the on / off of the switch as in the conventional case,
A desired temperature can be obtained without waste for floor heating.

Next, a second embodiment of an AC waveform control type controller (X ₂ ) of the present invention will be described. As described above, the PTC heater has a low electric resistance value in a low temperature state,
At the moment when the switch is turned on, a large current (so-called inrush current) flows. If the inrush current is large, an existing safety device (breaker) is required to design an electric circuit in accordance with the load at that moment, for example, to shut off the current, and thus an economic burden is imposed. In order to cope with such a large current that is required instantaneously, it is necessary to change an electric circuit such as a breaker or to change a power contract to a large capacity, which is unwilling. Therefore, in order to connect the electric circuit at the moment when the AC phase is zero (zero voltage) and to increase the current quietly, the ON timing of the switch is automatically adjusted by the phase control circuit. That is, as shown in FIG. 5, after the switch is turned on, the timing of zero voltage is calculated, and the electric circuit is connected at that moment. FIG. 5 shows the AC waveform control type controller (X ₂ ) of the _second embodiment.
As shown in FIG. 6, a zero-cross start circuit (II) is provided in addition to the phase control circuit (I), and as shown in FIG. Wait until the point when the switch comes on.

Next, as a third embodiment of the present invention, a controller (X ₃ ) of an AC waveform control system will be described. It is a controller for a sheet heating element by an AC waveform control system in which when a switch is turned on, a voltage gradually increases with a predetermined time to reach a predetermined voltage. This controller (X ₃ ) includes a soft start circuit (III) in addition to the phase control circuit (I) as shown in FIG.
Is provided to change the AC waveform as shown in FIG. As a result, the rush current can be reduced similarly to the above, which is effective. Soft start circuit (III)
May be provided together with the above-mentioned zero cross start circuit (II).

Next, a description will be given of a fourth embodiment of the AC waveform control type controller (X ₄ ) according to the present invention. It is P
In the temperature control of the planar heating element having the TC characteristic, the temperature is measured, and the phase control circuit (A) calculates and determines the AC waveform based on a difference from a previously input (variable) temperature set value to determine an AC waveform. Automatically change, adjust the amount of current passing, and automatically adjust the saturation temperature. As shown in FIG. 9, the controller (X ₄ ) has a temperature control unit for the phase control circuit (I).
(A), the temperature signal from the temperature sensing part (T) is input,
A temperature setting value (variable) is input to the temperature control unit (D) in advance by a knob (t ₂ ). The increase / decrease instruction is given to the phase control circuit (I) by the judgment of the temperature control unit (A), the AC waveform is automatically changed, and the current passing amount is adjusted.
Automatically adjust the saturation temperature.

FIG. 10 is a circuit diagram of an AC waveform control type controller according to the present invention, showing the arrangement and connection of a phase control circuit (I), a zero cross start circuit (II), and a soft start circuit (III). . Via the phase control circuit (I) SIDAC (Q ₁₎ Triac (Q
₂ ) The phase of the control signal applied to the gate (G) is controlled by the capacitor (C ₃ ) and the resistor (R ₇ ) / volume (VR ₁ ). Thus, by adjusting the volume (VR ₁ ), the phase is changed, and the amount of electricity transmitted to the PTC heater (H), which is a load, is controlled. The zero cross start circuit (II) is performed by Sidac (Q ₁ ). Here, the resistor (R ₉ ) and the diodes (D ₆ ) and (D ₇ ) are a control circuit for the Sidac (Q ₁ ). The soft start circuit (III) gradually starts up by charging the capacitor (C ₁ ) with the potential of the control signal applied to the gate (G) of the triac (Q ₂ ) via the Sidac (Q ₁ ). The inrush current flowing to the PTC heater (H), which is the above load, is reduced. (Sw ₁ ) is a switch of the whole circuit.

[0012]

As described above, when the temperature of the PTC heater rises, the electric resistance value increases, the current decreases, and the PTC heater stabilizes near a desired set temperature (for example, 40 ° C. or 60 ° C.). is there. According to the controller of the AC waveform control system for adjusting the temperature of the PTC heater of the present invention, the desired set temperature can be obtained by making the supply voltage constant at 100 V, for example, by taking advantage of such PTC heater characteristics. After the current is supplied to the PTC heater to reach the desired temperature, the temperature can be finely adjusted by changing the amount of electricity (current) in a small amount.

The operation to reach the desired temperature is not abrupt and can be performed with a margin of time.
This means that in the conventional method, the temperature is adjusted by turning the switch on and off, and the temperature is turned on and off depending on the temperature,
It can only be adjusted with a certain large temperature range, it is not energy saving, it is probably inconvenient for heating and it is not comfortable for the user, but according to the present invention, stability and energy saving of room temperature are It can be performed together. In addition, such temperature control is automatically performed so as to supply power based on a difference between a preset temperature and an actually measured temperature in connection with a change in the outside air temperature, so that more accurate temperature control can be performed more efficiently. Can be done

[Brief description of the drawings]

FIG. 1 is a diagram showing an alternating current waveform.

FIG. 2 is a graph showing a relationship between time and temperature of a PTC heater.

FIG. 3 is a diagram showing an embodiment of an AC waveform control type controller of the present invention.

FIG. 4 is a diagram showing an AC current waveform by the AC waveform control type controller of the present invention.

FIG. 5 is a diagram showing another embodiment of the AC waveform control type controller of the present invention.

FIG. 6 is a diagram showing an alternating current waveform according to the embodiment of FIG. 5;

FIG. 7 is a diagram showing still another embodiment of the AC waveform control type controller of the present invention.

FIG. 8 is a view showing an alternating current waveform according to the embodiment of FIG. 7;

FIG. 9 is a diagram showing still another embodiment of the AC waveform control type controller of the present invention.

FIG. 10 is a circuit diagram of a controller according to the present invention.

[Explanation of symbols]

(I) Phase control circuit (II) Zero cross start circuit (III) Soft start circuit (X ₁ ), (X ₂ ), (X ₃ ), (X ₄ ) Controller (t ₁ ), (t ₂ ) knob (H ) PTC heater (A) Temperature control part (T) Temperature sensing part

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 3K058 AA27 AA42 AA81 BA01 BA02 CA02 CA23 CA46 CA62 CB04 CB06 CB09 CB10 CB26 CB34 CC06 CD01 CE05 CE13 CE19 3K092 PP05 PP20 QB14 QB19 QB21 QB32 RF02 RF17 SS40 UA06 V19 V30

Claims (3)

[Claims] In a temperature control of a planar heating element having a PTC characteristic, a phase control circuit determines a change in a resistance value or the like manually and changes an AC waveform to change a temperature at which saturation is stabilized. Controller for sheet heating elements using AC waveform control method. 2. when a switch is turned on, a current starts to flow at a time when a voltage is zero; and / or
2. The controller for a planar heating element according to claim 1, wherein the voltage gradually increases with a predetermined time so as to reach a predetermined voltage. 3. In the temperature control of a planar heating element having PTC characteristics, a temperature is measured, and a phase control circuit determines the difference based on a difference from a temperature set value, and automatically changes an AC waveform to change a current passing amount. A controller for a sheet heating element using an AC waveform control method, which automatically adjusts the temperature at which saturation is stabilized by adjusting the temperature.