JPH0821462B2 - Floor heating panel temperature control device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a temperature control device for an electric floor heating panel.

BACKGROUND ART Conventionally, a temperature control device for a floor heating panel, in which a heater is incorporated in the floor panel to heat the room from the floor, is a heating device provided in the floor panel 1 as shown in FIG. A series circuit of a heater 2 for heating and a semiconductor switch circuit 3 using a thyristor is connected to an AC power supply 4, and the semiconductor switch circuit 3 is turned on based on an output of a temperature detection element 5 for detecting the temperature of the floor panel 1, In some cases, a switch control circuit 6 is provided for controlling the energization of the heater 2 so that the floor panel 1 is turned off to a predetermined temperature. By the way, in such a conventional example, the temperature setting circuit for setting the temperature of the floor panel 1 to a desired temperature is fixed, and the maximum temperature and the minimum temperature in the temperature adjustable range are set to the installation condition of the floor panel 1. It could not be adjusted accordingly. In addition, there is a variation in the temperature controllable range due to a variation due to a manufacturing error of the components constituting the switch control circuit 6, and there is a problem that the position of the temperature control knob and the set temperature do not correspond exactly 1: 1. Further, the switch control circuit 6
There is also a problem that the temperature of the floor panel 1 may become a dangerous temperature higher than a predetermined temperature when the amount of electricity supplied to the heater 2 is increased due to some abnormality or the like.

[Object of the Invention] The present invention has been made in view of the above points, and an object of the present invention is to set the temperature adjustable range to any desired value, and to accurately set the temperature control knob and the set temperature. 1: 1 correspondence is possible, and even if the temperature inside the floor panel rises abnormally for some reason, the heat switch is turned off when the temperature reaches or exceeds the specified dangerous temperature, and the power to the heater is stopped. An object of the present invention is to provide a temperature control device for a floor heating panel that can prevent danger due to overheating.

DISCLOSURE OF THE INVENTION (Structure) The present invention detects the temperature of a floor panel by connecting a series circuit of a heater for heating arranged in the floor panel and a semiconductor switch circuit using a thyristor to an AC power source. The semiconductor switch circuit is turned on based on the temperature detection element output,
In a floor heating panel control device that is equipped with a switch control circuit that controls the power to the heater so that the floor panel reaches a predetermined temperature by turning off, a temperature control knob that sets the temperature of the floor panel is attached. A first sub-adjustment volume consisting of a main adjustment volume, a semi-fixed volume serially connected to the main adjustment volume, and a second sub-adjustment consisting of a semi-fixed volume connected in parallel to the main adjustment volume. It is composed of a control volume, and the maximum temperature and the minimum temperature of the temperature adjustable range can be freely set by both sub-adjustment volume, and it is connected in series to the series circuit of the heater and the semiconductor switch circuit via a temperature fuse. A bidirectional three-terminal thyristor and a thermal switch that is turned off when the temperature in the floor panel exceeds a predetermined dangerous temperature, By having an overheat protection circuit which is formed by applying a trigger signal via the heat-sensitive switch and a gate resistor to the gate terminal of the serial bidirectional triode thyristor,
The temperature adjustable range can be set arbitrarily, and the temperature control knob and the set temperature can be made to correspond exactly 1: 1.Furthermore, even if the temperature inside the floor panel rises abnormally for some reason, When the temperature exceeds the dangerous temperature, the thermal switch turns off to turn off the bidirectional three-terminal thyristor, stop the energization of the heater and suppress the abnormal temperature rise of the floor panel to prevent the danger due to overheating. It is intended to provide a floor heating panel temperature control device capable of performing the above.

(Embodiment) FIGS. 1 to 15 show an embodiment of the present invention. The floor panel 1 has a wood surface material as shown in FIGS. 1 to 3.
A heat equalizing plate 21 is arranged on the back surface of 20, and a pair of heaters 2a, 2b for heating are arranged below the heat equalizing plate 21, and the heaters 2a, 2b are arranged.
A heat insulating material 22 is provided below the heat insulating material. In the floor panel 1, the heat sensitive switches Sta and Stb arranged on the lower surfaces of the heaters 2a and 2b, the gate resistances R ₀ a and R ₀ b, and the thermal fuses.
An overheat prevention circuit consisting of Fta and Ftb and a bidirectional three-terminal thyristor (hereinafter abbreviated as triac) Q _1a and Q _1b is incorporated, and the temperature inside the floor panel 1 is partially preset. Overheat switch S when the temperature exceeds the dangerous temperature
_ta, the triac Q _1a S _tb is turned off, to stop the triggering of Q _1b, to prevent the risk due to overheating by stopping the energization of the heater 2a, 2b by turning off the triac Q _1a, the Q _1b It has become.

The semiconductor switch circuit 3 connected in series to the heaters 2a and 2b is the triac built in the floor panel 1.
It is formed by connecting Q ₁ a, Q ₁ b and temperature control triac Q ₂ in series. Triac Q ₂ is triggered by triac Q ₃ at the output of switch control circuit 6. It has become. Here, the heaters 2a and 2b are connected to the AC power source 4 via the semiconductor switch circuit 3 and the power switch SW _{1 including a} double-sided switch,
The power switch SW ₁ and the semiconductor switch circuit 3 control the energization of both heaters 2a and 2b. Further, in the gate control circuit of the temperature control triac Q _{2 including} the capacitor C ₂ , the resistor R _1, and the triac Q ₃ ,
Inserting the temperature-sensitive switch Ts to turn off when it detects the temperature of the lead terminals of the triac Q ₂ is the temperature of the triac Q ₂ becomes higher than a predetermined temperature which is set lower than the breakdown temperature (95 to 105 ° C.) The overload protection circuit has been formed to protect the TRIAC when it is used in an overload or high temperature place.
When a current exceeding the rated current flows into Q ₂ and it becomes an overload condition, heat generation of TRIAC Q ₂ is detected and temperature switch Ts is turned off, so TRIAC Q ₃ turns off and TRIAC Q ₂ triggers. To prevent damage due to continued operation of the TRIAC Q ₂ under overload.

The switch control circuit 6 for controlling the temperature control triac Q ₂ includes a transistor Q ₄ and a zero volt switch circuit ZS.
And diodes D ₁ and D ₂ , capacitors C _{3 to} C ₅ , volumes VR _{1 to} VR ₃ and resistors R _{3 to} R _10, and the thermistor TH for detecting the surface temperature of the floor panel 1. Based on the output of the temperature detection element 5 consisting of
Is controlled to be turned on and off to control the energization of the heaters 2a and 2b so that the floor panel 1 reaches a predetermined temperature.
Here, the voltage obtained by rectifying and stepping down the AC power supply 4 by the rectifying step-down circuit composed of the rectifying diode D ₁ and the resistor R ₁₀ is the current detection resistor R ₉ and the light emitted by the voltage across the resistor R _9. It is designed to be applied to the circuit power supply line via the operation display circuit 8 consisting of a parallel circuit with the diode LED, and is smoothed by the smoothing capacitor C ₄ and the circuit power supply (DC8V)
Is obtained. Zero volt switching circuit ZS this circuit power is applied to the terminals, a comparator formed by a feedback resistor R ₄ of the operational amplifier and the external is built, the AC power source when the comparator output becomes "H" It is composed of a pulse generation circuit that generates a trigger pulse synchronized with the zero-cross point of the AC power supply voltage input from the input terminal and outputs the trigger pulse from the trigger pulse output terminal. 4V) and the temperature detection signal is input to the non-inverting input terminal. Therefore, when the temperature of the floor panel 1 is lower than the predetermined temperature set in advance and the temperature detection signal becomes lower than the reference voltage, the comparator output becomes “H” and the semiconductor switch circuit is switched from the pulse generating circuit. A trigger pulse for triggering 3 in the vicinity of the zero cross point of the AC power supply is output. Reference voltage generating circuit, the transistor Q _4, the voltage-dividing resistors
The reference voltage (4V) is generated by being constituted by R ₅ and R _6, and after the circuit power is supplied through the transistor Q ₄ , it is divided by the resistors R ₅ and R ₆ . On the other hand, for the temperature detection signal, the circuit power source is a resistor R ₈ , a transistor Q ₄ ,
When the thermistor TH is disconnected, the thermistor TH in which a resistor R ₇ for disconnection compensation that prevents the semiconductor switch circuit 3 from continuing to be turned on is connected in parallel, the diode D _2, and the temperature setting circuit 9
It can be obtained by dividing the voltage with the volumes VR ₁ to VR ₃ that compose the. Here, the volume VR ₃ of the temperature setting circuit 9 is a main adjustment volume to which a temperature adjusting knob 9a for setting the temperature of the floor panel 1 is attached to the rotary shaft, and the volumes VR ₁ and VR ₂ are These are first and second sub-adjustment volumes consisting of semi-fixed volume connected in series or in parallel to the main adjustment volume VR ₃ and the temperature can be adjusted by the sub-adjustment volumes VR ₁ and VR ₂ . The maximum and minimum temperature of the range can be set freely. In the embodiment, the maximum temperature and the minimum temperature of the adjustable range are set to 50 ° C. and 25 ° C., respectively.
Further, by adjusting the volumes VR ₁ and VR ₂ , the position of the temperature control knob 9a and the set temperature of the floor panel 1 can be made to correspond exactly 1: 1.

One of the circuit power supply lines is connected to the embedded box through the lightning surge absorbing circuit 7 including the discharge gap G formed by the copper foil pattern of the printed circuit board 13 on which the circuit components are mounted and the nonlinear resistance element Z ₂ . It is connected to the heat sink 11 which also serves as a mounting plate of the above, and is grounded to the earth through the aluminum heat sink 11 and the embedded box. By absorbing at _{2, the} circuit components are protected. In this case, by appropriately setting the gap width of the discharge gap G (for example, 0.4 ± 0.1 mm), the lightning surge absorption circuit 7 is operated against lightning surge,
In addition, it is possible to prevent the high voltage for measurement applied during the insulation test from operating, and it is not necessary to remove the non-linear resistance element Z ₂ during the insulation test, which facilitates the insulation test. Further, a plurality of mountain-shaped protrusions Ga ₁ , Ga ₂ and Ga ₃ are formed on one electrode Ga of both electrodes Ga and Gb of the discharge gap G formed by the copper foil pattern, and they are opposed by discharge. the shortest one chevron projection distance between the electrodes Ga _1, Ga _2, discharge from Ga ₃ is generated, even if the discharge one chevron protrusion by Ga _1, Ga _2, Ga ₃ are destroyed sequentially rest Since the discharge can be performed through the mountain-shaped protrusions Ga ₁ , Ga ₂ , and Ga ₃ , the reliability against lightning surge is improved and the life is extended. Furthermore, the ground-side terminal of the non-linear resistance element Z ₂ and the heat sink 12 are connected by caulking the brass connection pin P, one end of which is soldered to the printed circuit board 13, to the heat sink 12. Therefore, the electrical connection and the fixing of the printed circuit board 13 are performed at the same time, and the assembling can be easily performed.

Also, usually, the power supply connection terminal T _5, the abnormal Atsushi Nobori prevention fuse to prevent abnormal Atsushi Nobori of the floor panel 1 when the AC200V is applied by mistake to T ₆ the commercial power supply of AC100V is applied
The Fc is formed by the narrow width portion provided in the copper foil pattern of the portion of the printed circuit board 13 that supplies the circuit power.
0V is applied to the power supply connection terminals T ₅ and T ₆ , and the capacitor C ₁ is connected in parallel.
Abnormal temperature rise prevention when ₁ (varistor voltage is 198V to 242V) is destroyed by a large current and the triacs Q ₁ a and Q ₁ b are short-circuited due to overload (when they remain on) Fuse Fc for fuse is blown, power supply to switch control circuit 6 is stopped and trigger pulse is no longer output, TRIAC Q ₂ is turned off and heaters 2a, 2b
The power supply to the floor panel 1 is stopped to prevent an abnormal temperature rise of the floor panel 1.

Moreover, short-circuit protection circuit that shuts off or shorted heater 2a, 2b is a short-circuit current when the floor panel connector T _1, T ₂ are short-circuited is formed by short-circuit protection fuse Fs,
The short-circuit protection fuse Fs is formed by providing a narrow width portion (4 to 5 mm) in the copper foil pattern of the load power supply line portion of the printed circuit board 13, and a large short-circuit current flows through the narrow width portion, so that the short-circuit protection is performed. The fuse Fs for fuse is blown and the power supply is stopped to prevent abnormal operation.

Further, floor panel connection terminals T ₁ , T to which the floor panel 1 is connected
_{2. The} sensor connection terminals T ₃ and T ₄ to which the temperature detecting element 5 is connected and the power supply connection terminals T ₅ and T ₆ are formed by quick connection terminals provided at the end of the printed circuit board 13 and connected to the power supply. Terminal T ₅ , T
₆ is provided at a position apart from the sensor connection terminals T ₃ and T ₄ and adjacent to the floor panel connection terminals T ₁ and T ₂ , and the power supply connection terminals T ₅ and T ₆ are arranged in the vertical direction. Connection terminals T ₁ , T ₂ ,
T ₃ and T ₄ are arranged laterally. Therefore, it is difficult to make a mistake in connection such that the power supply line is connected to the sensor connection terminals T ₃ and T _4, and it is possible to prevent the occurrence of a failure due to incorrect wiring. Each connection terminal T _{1 to} T ₆
The electric wire (single wire) to be connected to is connected to each of the connection terminals T _{1 to} T ₆ through the electric wire insertion hole 15 formed on the back surface of the case 10 by a lock, and the electric wire (solid wire) By operating the released release button 17 with a screwdriver, the lock is released and the electric wire is removed. Note that, in FIGS. 8 to 11, the locking spring and the locking release button of the connection terminals T ₁ , T ₂ , T ₃ , T ₄ are not shown, and the connection terminals T ₅ , T ₆ are integrated. It is a terminal block. In addition, the heat sink 12
A plate 14 is attached to the portion protruding from the case 10.

Hereinafter, the operation of the present invention will be described. First, the basic operation of the temperature control will be explained. Now, by turning on the power switch SW ₁ , the heater 2
The AC power supply 4 is applied to both ends of the series circuit of a and 2b and the semiconductor switch circuit 3, and the AC power supply 4 is also fed to the switch control circuit 6, and the switch control circuit 6 outputs the temperature detection element 5 based on the output. Triac Q ₂ is controlled on and off. In the embodiment, the temperature of the floor panel 1 is the thermistor.
It is detected as a resistance change of the temperature detection element 5 made of TH, and the resistance of the temperature detection element 5 decreases as the temperature of the floor panel 1 increases. Therefore, when the temperature of the floor panel 1 exceeds the predetermined temperature set by the volume VR _3, the temperature detection signal that changes according to the resistance change of the temperature detection element 5 becomes higher than the reference voltage and the switch control is performed. The trigger pulse is no longer output from the zero volt switch circuit ZS of the circuit 6, the triac Q ₂ of the semiconductor switch circuit 3 is turned off, and the power supply to the heaters 2a and 2b is stopped. On the other hand, when the temperature of the floor panel 1 becomes lower than the predetermined temperature, the temperature detection signal becomes lower than the reference voltage and the trigger pulse from the zero volt switch circuit ZS of the switch control circuit 6 becomes the zero cross point of the AC power supply voltage. It is output in synchronization, the triac Q ₂ is turned on, and the heaters 2a and 2b are energized, and the temperature of the floor panel 1 is automatically controlled to always be the predetermined temperature set by the volume VR ₃ . Has been done.

Next, the operation of the temperature setting circuit 9 will be described. When adjusting the temperature adjustable range, first connect the first dummy resistor having a resistance value corresponding to the resistance value of the thermistor TH at the desired maximum temperature to the sensor connection terminal.
In addition to connecting to T ₃ and T ₄ , set the temperature control knob 9a to the maximum temperature position (set to the position where the resistance value of the volume VR ₃ becomes 0), and in this state the trigger pulse is output from the zero volt switch circuit ZS. Volume VR ₃
Volume consisting of semi-fixed volume connected in series to
Adjust and fix VR ₁ . Next, a second dummy resistor having a resistance value corresponding to the resistance value of the thermistor TH at the desired minimum temperature is connected to the sensor connection terminals T ₃ and T ₄ , and
Set the temperature control knob 9a to the lowest temperature position (set to the position where the resistance value of the volume VR ₃ becomes the maximum value), and in this state, parallel to the volume VR ₃ so that the trigger pulse is output from the zero volt switch circuit ZS. Adjust and fix the connected volume VR ₂ consisting of semi-fixed volume.
By the above adjustment, the temperature adjustable range by the temperature adjusting knob 9a can be set to a desired range according to the installation condition of the floor panel 1, and moreover, there is a manufacturing error in the components constituting the switch control circuit 6. However, the temperature control knob 9a and the set temperature can correspond exactly 1: 1.

[Effect of the Invention] As described above, the present invention connects a series circuit of a heater for heating arranged in a floor panel and a semiconductor switch circuit using a thyristor to an AC power source to control the temperature of the floor panel. A control device for a floor heating panel, comprising a switch control circuit for controlling ON / OFF of the semiconductor switch circuit based on a detected temperature detection element output to control energization of a heater so that the floor panel reaches a predetermined temperature. A main adjusting volume to which a temperature control knob for setting the temperature of the floor panel is attached, a first sub-adjusting volume consisting of a semi-fixed volume serially connected to the main adjusting volume, and the main adjusting volume It consists of a second sub-adjustment potentiometer consisting of a semi-fixed potentiometer connected in parallel to the volume, and both sub-adjustment potentiometers control the maximum temperature in the temperature adjustable range. And the minimum temperature can be set freely, and the temperature inside the floor panel becomes equal to or higher than a predetermined dangerous temperature, as well as the bidirectional three-terminal thyristor connected in series to the series circuit of the heater and the semiconductor switch circuit via a temperature fuse. Since a heat sensitive switch which is turned off when it is turned on is provided and an overheat prevention circuit is provided by applying a trigger signal to the gate terminal of the bidirectional three-terminal thyristor through the heat sensitive switch and the gate resistance, The temperature adjustable range can be set arbitrarily according to the installation situation, and moreover, even if there are variations due to manufacturing errors in the parts that make up the switch control circuit, the temperature adjustment knob and the set temperature can be made to correspond exactly 1: 1. In addition, even if the temperature inside the floor panel rises abnormally for some reason, the heat-sensitive switch is turned off when the temperature reaches or exceeds a predetermined dangerous temperature, and the two-way three-way Turns off thyristor, a power supply to the heater is stopped to suppress an abnormal temperature rise of the floor panel can be prevented danger from overheating,
In addition, since the bidirectional three-terminal thyristor is immediately turned off and the power supply to the heater is stopped when the heat sensitive switch is turned off due to a predetermined dangerous temperature abnormality, the safety is high, and the overheat prevention circuit has a temperature fuse. It can be reused without replacement work like the case of using, and has an effect of being convenient.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an embodiment of the present invention, FIG. 2 is a partially cutaway perspective view of the above, and FIG.
FIG. 5 is a front view of an essential part of the same, FIG. 5 is a bottom view of the essential part of the same, FIG. 6 is a side view of the essential part of the same, and FIG.
FIG. 8 is a top view of relevant parts of the above, FIG. 9 is a side view of relevant parts of the same, FIG. 10 is a side view of relevant parts of the same, FIG. 11 is a bottom view of relevant parts of the same, FIG. 12 and FIG. Fig. 14 is a sectional view of the same as above, Fig. 14 (a) is a bottom view of an essential part of the same, Fig. 14 (b) is an enlarged bottom view of an essential part of the same, and Fig. 15 is a top view of an important part of the same. FIG. 4 is a block circuit diagram of a conventional example. 1 is a floor panel, 2a and 2b are heaters, 3 is a semiconductor switch circuit, 4 is an AC power supply, 5 is a temperature detecting element, 6 is a switch control circuit, 9 is a temperature setting circuit, 9a is a temperature control knob, and VR _{1 to} VR ₃
Is the volume.

Claims (1)

[Claims] 1. A series circuit of a heater for heating arranged in a floor panel and a semiconductor switch circuit using a thyristor is connected to an AC power source, and is based on a temperature detection element output for detecting the temperature of the floor panel. And turn on the semiconductor switch circuit,
In a floor heating panel control device that is equipped with a switch control circuit that controls the power to the heater so that the floor panel reaches a predetermined temperature by turning off, a temperature control knob that sets the temperature of the floor panel is attached. A first sub-adjustment volume consisting of a main adjustment volume, a semi-fixed volume serially connected to the main adjustment volume, and a second sub-adjustment consisting of a semi-fixed volume connected in parallel to the main adjustment volume. It is composed of a control volume, and the maximum temperature and the minimum temperature of the temperature adjustable range can be freely set by both sub-adjustment volume, and it is connected in series to the series circuit of the heater and the semiconductor switch circuit via a temperature fuse. A bidirectional three-terminal thyristor and a thermal switch that is turned off when the temperature in the floor panel exceeds a predetermined dangerous temperature, Temperature control apparatus for floor heating panel comprising the overheat prevention circuit formed by applying a trigger signal via the heat-sensitive switch and a gate resistor to the gate terminal of the serial bidirectional triode thyristor.