JPH0732057B2 - 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 and a semiconductor switch circuit 3 using a thyristor is connected to an AC power source 4, and the floor panel 1
A switch control circuit 6 is provided for controlling ON / OFF of the semiconductor switch circuit 3 on the basis of the output of the temperature detecting element 5 for detecting the temperature of the heater 2 to control the energization of the heater 2 so that the floor panel 1 reaches a predetermined temperature. There was By the way, in such a conventional example, a plurality of thermal switches for detecting overheat are provided in the floor panel 1, and when the thermal switches operate, the thyristor for temperature control of the semiconductor switch circuit 3 is forcibly turned off. In some cases, the floor panel 1 is prevented from overheating. However, in such a conventional example, when the thyristor is destroyed due to overload and becomes a short circuit state, the temperature control function is lost and the overheat prevention function is also lost at the same time. There is a problem that the temperature of 1 rises abnormally and becomes dangerous.

[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 keep the temperature of the floor panel abnormal without losing both the temperature control function and the overheat prevention function. It is to provide a temperature control device for a floor heating panel that does not rise to a dangerous state.

DISCLOSURE OF THE INVENTION (Configuration) The present invention relates to a heater for heating arranged in a floor panel,
Connect a series circuit with a semiconductor switch circuit using a thyristor to an AC power supply, and turn on / off the semiconductor switch circuit based on the output of a temperature detection element that detects the temperature of the floor panel, and the floor panel will reach a predetermined temperature. In a control device for a floor heating panel having a switch control circuit for controlling energization of a heater, a temperature control thyristor for controlling the temperature of the floor panel to a predetermined temperature, which is controlled based on the output of the temperature detection element, and the floor panel. Temperature control function and overheat prevention by forming a semiconductor switch circuit in series with a thyristor for overheat prevention that is turned off when a plurality of thermal switches for overheat detection are activated The functions are not lost together, and the floor panel temperature does not rise abnormally and become dangerous. It is intended.

(Embodiment) FIGS. 1 to 15 show an embodiment of the present invention. The floor panel 1 has a wooden surface material 20 as shown in FIGS.
Is formed by disposing a heat equalizing plate 21 on the back surface of the device, arranging a pair of heaters 2a, 2b for heating under the heat equalizing plate 21, and disposing a heat insulating material 22 under the heaters 2a, 2b. ing. In the floor panel 1, heat sensitive switches Sta and Stb for detecting overheat disposed on the lower surfaces of the heaters 2a and 2b, and gate resistors R _0a and R _0b ,
A temperature fuse Fta, Ftb and a bidirectional three-terminal thyristor (hereinafter abbreviated as triac) Q _1a , Q _1b are incorporated in the overheat prevention circuit, and the temperature inside the floor panel 1 is partially preset. When the temperature exceeds the specified dangerous temperature, the thermal switches Sta and Stb turn off and the triacs Q _1a and Q _1b
Is stopped and the triacs Q _1a and Q _1b are turned off to stop the energization of the heaters 2a and 2b to prevent danger due to overheating.

The semiconductor switch circuit 3 connected in series to the heaters 2a and 2b connects the overheat prevention triacs Q _1a and Q _1b incorporated in the floor panel 1 and the temperature control triac Q ₂ in series, respectively. Formed by the triac
Q ₂ is triggered by the output of the switch control circuit 6 via the triac Q ₃ . Here, heaters 2a, 2
b is connected to the AC power source 4 via the semiconductor switch circuit 3 and a power switch SW ₁ composed of a double-sided switch, and the power switch SW ₁ and the semiconductor switch circuit 3 are connected.
The energization to both heaters 2a and 2b is controlled by. In addition, the capacitor C ₂ , the resistor R _1, and the triac
The gate control circuit of the temperature control triac Q ₂ to which more becomes Q _3, a predetermined temperature by detecting the temperature of the lead terminals of the triac Q ₂ is the temperature of the triac Q ₂ is set lower than the breakdown temperature (95 A temperature-sensitive switch Ts that turns off when the temperature becomes higher than 105 ° C) is inserted to form an overload protection circuit.For example, the heaters 2a and 2b are short-circuited or the panel connection terminals T ₁ and T ₂ are Accidentally shorted Triac Q ₂
When a current exceeding the rating flows into the
By detected by thermal switch s heat generation of triac Q ₂ is turned off, due to the fact that the triac Q ₃ is turned off to stop the triggering of the triac Q _2, triac Q ₂ is operated continuously under overload conditions It is designed to prevent destruction.

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. The zero-volt switch circuit ZS to which this circuit power is applied to the terminal is composed of an internal operational amplifier and an external feedback resistor R ₄ and an AC power supply when the comparator output becomes "H". It is composed of a pulse generation circuit that outputs a trigger pulse output terminal that generates a trigger pulse that is synchronized with the zero-cross point of the AC power supply voltage that is input from the input terminal.The reference voltage (4V in the example is applied to the inverting input terminal of the operational amplifier). ) Is input, 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. The reference voltage generating circuit consists of a transistor Q ₄ and a voltage dividing resistor R.
_5, is constituted by R _6, which is a circuit power as was energized via the transistor Q _4, the resistor R _5, the reference voltage by applying at R ₆ minute (4V) is generated. On the other hand, for the temperature detection signal, the circuit power source is a resistor R ₈ , a transistor Q ₄ , a thermistor TH in which a resistor R ₇ for disconnection compensation is connected in parallel, a diode D _2, and a volume VR forming a temperature setting circuit 9.
It can be obtained by dividing the voltage with _{1 to} VR ₃ . Here, the temperature setting when controlling the floor panel 1 to a constant temperature is performed by turning the temperature control knob attached to the rotary shaft of the volume VR ₃ , and the maximum temperature and the minimum temperature of the adjustable range ( The setting of 50 ° C. and 25 ° C.) is performed using semi-fixed volumes VR ₁ and VR ₂ .

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 the mounting plate of the above, and is grounded to the earth through the aluminum heat sink 11 and the embedded box. Therefore, high voltage due to lightning surge is applied to the nonlinear resistance element Z via the discharge gap G. 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. In addition, 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.

Further, a fuse Fc for preventing abnormal temperature rise that prevents abnormal temperature rise of the floor panel 1 when AC200V is erroneously applied to the power supply connection terminals T ₅ and T ₆ to which commercial power of AC 100V is applied
Is formed in the narrow width part provided in the copper foil pattern of the part that supplies the circuit power of the printed circuit board 13, and the AC200V
Is applied to the power supply connection terminals T ₅ and T ₆ , the nonlinear resistance element Z ₁ (varistor voltage is 198V to 242V) for surge noise elimination in which the capacitor C ₁ is connected in parallel is destroyed by a large current, and the triac When Q _1a and Q _1b are short-circuited due to overload (when they remain in the ON state),
The fuse Fc for preventing abnormal temperature rise is blown, the power supply to the switch control circuit 6 is stopped and the trigger pulse is no longer output, the triac Q ₂ is turned off, and the power supply to the heaters 2a and 2b is stopped and the floor panel The abnormal temperature rise of No. 1 is prevented.

Also, the heaters 2a and 2b are short-circuited, the floor panel connector T ₁ ,
A short-circuit protection circuit that shuts off the short-circuit current when T ₂ is short-circuited is an overload protection circuit using the temperature-sensitive switch Ts,
The fuse Fs for short circuit protection 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 to prevent a large short circuit current. By flowing through the narrow portion, the short-circuit protection fuse Fs is blown and the power supply is stopped to prevent abnormal operation.

Further, the floor panel connection terminal T ₁ to which the floor panel 1 is connected,
T ₂ , sensor connection terminals T ₃ and T ₄ to which the temperature detection 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.
T ₅ and T ₆ are provided at positions 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
Power supply connection terminals T ₅ , T ₆ are arranged vertically, and both connection terminals T ₁ ,
T ₂ , T ₃ and T ₄ are arranged in the lateral direction. 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. In addition, each connection terminal T ₁ ~
Wires connected to T ₆ (single line) is adapted to be locked connected through an electric wire insertion hole 15 drilled in the back of the case 10 to the connection terminals T ₁ through T _6, remove the hole 16 By operating the release button 17 exposed inside with a screwdriver, the lock is released and the electric wire is removed. The eighth
In FIGS. 11 to 11, the floor panel connection terminals T ₁ and T ₂ and the sensor connection terminals T ₃ and T ₄ are not shown with the lock spring and the lock release button, and the connection terminals T ₅ and T ₆ are integrated. It has become a terminal block. A plate 14 is attached to the portion of the heat dissipation plate 12 protruding from the case 10.

The operation of the present invention will be described below. First of all, I will explain the basic operation of temperature control.
By turning on the power switch SW ₁ , heaters 2a, 2b
The AC power supply 4 is applied to both ends of the series circuit of the semiconductor switch circuit 3 and the semiconductor switch circuit 3, and the AC power supply 4 is also supplied to the switch control circuit 6, and the switch control circuit 6 outputs the triac Q ₂ based on the output of the temperature detection element 5. Is turned on and off. In the embodiment, the temperature of the floor panel 1 is detected as the resistance change of the temperature detecting element 5 composed of the thermistor,
The resistance of the temperature detecting 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 temperature control 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 ZS of the switch control circuit 6 is synchronized with the zero cross point of the AC power supply voltage. Then, 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 so as to always be the predetermined temperature set by the volume VR ₃ . ing.

Next, the operation of the semiconductor switch circuit 3 according to the present invention will be described. Now, the semiconductor switch circuit 3 is formed by a series circuit of a temperature control triac Q ₂ and an overheat prevention triac Q _1a , Q _1b which are connected in series, and both triacs Q ₂ , Q _1a , Q _1b are connected. Our temperature control triac
Q ₂ is triggered by the output of the temperature detection element 5 via the zero volt switch circuit ZS, and has a temperature control function to control the temperature of the floor panel 1 to a preset temperature. is doing. On the other hand, a plurality of overheat-preventing triacs Q _1a and Q _1b are provided at important points in the floor panel 1, and overheat detection thermal switches S _0a and S _{0b are provided.}
When any one of them operates, the trigger is stopped and turned off, and it has an overheat prevention function of preventing overheating of the floor panel 1. Here, both triacs Q ₂ , triacs Q _1a , Q
_{Since 1b} is connected in series, either triac
If Q ₂ or Q _1a , Q _1b is turned off, the power supply to the heaters 2a, 2b is stopped, and both triacs Q ₂ ,
Since Q _1a, the probability that Q _1b is shorted fail simultaneously is extremely small, without temperature control function and the overheat prevention function is lost at the same time, will not be the temperature of the floor panel 1 is abnormally elevated in a dangerous situation It is like this. Further, in the embodiment, since the overheat preventing triacs Q _1a and Q ₁ are arranged in the floor panel 1, the wiring can be simplified as compared with the case where the triacs Q _1a and Q _1b are arranged in the case 10 (2 Wire wiring is possible).

[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. In a control device for a floor heating panel, comprising a switch control circuit for controlling energization to a heater so that the floor panel has a predetermined temperature by controlling ON / OFF of the semiconductor switch circuit based on a temperature detection element output to be detected, It is turned off when a temperature control thyristor that controls the temperature of the floor panel to a predetermined temperature, which is controlled based on the output of the temperature detection element, and a plurality of heat detection switches for overheat detection, which are installed at various points in the floor panel, operate. A semiconductor switch circuit is formed by a series circuit with an overheat prevention thyristor, and both thyristors that make up the semiconductor switch circuit are short-circuited simultaneously. Since the probability of doing so is extremely small, both the temperature control function and the overheat prevention function are not lost, and there is an effect that the temperature of the floor panel does not rise abnormally and becomes dangerous.

[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. 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, and _Q1a , _Q1b , Q. ₂ is a triac, and S _0a and S _0b are thermal switches.

Claims (2)

[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 equipped with a switch control circuit that controls the energization of the heater so that the floor panel reaches a predetermined temperature by controlling the off state, the temperature of the floor panel is controlled based on the output of the temperature detection element. The semiconductor switch circuit is a series circuit consisting of a temperature control thyristor that is controlled by the thyristor and a thermal shutdown thyristor that is turned off when multiple thermal switches for overheat detection are installed A temperature control device for a floor heating panel characterized by being formed. 2. A temperature control device for a floor heating panel according to claim 1, wherein a thyristor for preventing overheating is arranged in the floor panel.