JPS5950021B2 - electric floor heater - Google Patents

Description

[Detailed Description of the Invention] This invention turns on the current flowing through the planar heater for floor heating.
The present invention relates to an electric floor heater that can prevent the temperature of a planar heater from rising to an abnormal temperature even when a semiconductor temperature control device that performs off-control fails.

Typically, an electric floor heater uses a semiconductor temperature control device to control on/off the current flowing through the planar heater.

This temperature control device has the disadvantage that when a component breaks down, temperature control becomes impossible and the temperature of the planar heater rises to an abnormal level, causing a fire. Therefore, an object of the present invention is to control the temperature of a sheet heater using a temperature control device, but even if this temperature control device malfunctions and the temperature of the sheet heater rises to an abnormal temperature, the surface heater can be reliably controlled. To provide an electric floor heater that can cut off power to a heater.

In order to achieve such an object, the present invention provides an AC power source, a planar heater for floor heating, and an earth leakage/disconnector with a trip coil that cuts off power to the planar heater when energized. and a temperature detection section that is thermally coupled to this sheet heater and turns on and off depending on the temperature of this sheet heater and outputs a temperature detection signal, and a temperature detection section that operates upon receiving this temperature detection signal and flows to the sheet heater. A temperature control device consisting of a power control unit that controls current is thermally coupled to a sheet heater, and one or more pieces are arranged depending on the width of the sheet heater, so that the temperature of the sheet heater can be adjusted locally. The device is equipped with a temperature control switch that turns on when the temperature rises to an abnormal level and reaches the switching temperature to energize a trip coil for leakage or disconnection, and will be described in detail below using examples.

FIG. 1 is a circuit diagram showing an embodiment of an electric floor heater according to the present invention.

In the figure, 1 is an AC power source, 2 is an electric leakage or disconnector with a trip coil that operates due to electric leakage or overcurrent, and 3 is an AC power supply, the details of which are shown in Figure 2. The planar heater for floor heating shown in FIG. 4 is a heat-sensitive thyristor that is thermally coupled to the planar heater 3, operates when the temperature of the planar heater 3 reaches a predetermined value, and outputs a temperature detection signal. , a temperature detection unit such as a small-capacity thermostat or a thermal reed relay; 5 is a thyristor or triax; and 5 is a power control unit that operates in response to a temperature detection signal from the temperature detection unit 4; 6 is a power control unit as shown in FIG. To,
The device is thermally coupled to the planar heater 3, and one or more heaters are arranged depending on the width of the planar heater 3, so that the temperature of the planar heater 3 locally rises to an abnormal temperature and reaches the switching temperature. This temperature control switch 6 is a temperature control switch such as a thermostat that turns on when the
The test button switch 9 is connected in parallel to the test button switch 9. Note that 7 is a temperature control device comprising the temperature detection section 4 and the power control section 5.

In addition, the electric leakage and disconnection circuit 2 with trip coil shown in Fig.
, 8 is a trip coil, 9 is a test button switch, 10a to 10f are diodes, 11a to 11C are resistors, 12a and 12b are capacitors, 13 is a thyristor, and 14a and 14b are temperature control switches 6 arranged in the planar heater 3. This is the terminal to be connected to. Note that this leakage and the operation of the disconnector 2 are well known, so a detailed explanation will be omitted.

Next, the operation of the electric floor heater according to the above configuration will be explained. First, when the power control section 5 of the temperature control device 7 is operating normally, the power of the AC power source 1 is applied to the planar heater 3 through the leakage circuit or the disconnector 2 .

Therefore, this planar heater 3 rises to a predetermined temperature.
On the other hand, when the planar heater 3 rises to a predetermined temperature, the temperature control device 7 is activated and turned off. Therefore, the supply of electric power to the planar heater 3 is stopped, and the temperature of the planar heater 3 decreases. Then, as the temperature of the sheet heater 3 decreases, the temperature control device 7 is turned on again, and power is supplied to the sheet heater 3. In this way, the planar heater 3 is maintained at a predetermined temperature by on/off control of the temperature control device 7. Next, if the power control unit 5 of the temperature control device 7, for example, the triax, is damaged for some reason, or if other circuit parts are damaged, the temperature of the planar heater 3 rises to an abnormal temperature. We will also explain the actions that can be taken to effectively prevent a fire from occurring.

When the temperature of the planar heater 3 rises to an abnormal temperature and reaches the switching temperature, the temperature control switch 6 is turned on. Due to the operation of the temperature control switch 6, the trip coil 8 of the circuit breaker 2 is energized. For this reason,
When the current leaks, the circuit breaker 2 operates, and the alternating current voltage applied to the sheet heater 3 can be cut off. Therefore, the temperature of the planar heater 3 decreases, and dangers such as fire due to abnormal overheating can be prevented. It goes without saying that the set temperature of the temperature control switch 6 may be adjusted depending on the type of the planar heater 3. Once this electrical leakage occurs or the disconnector 2 operates, the sheet heater 3 will be activated unless it is turned on manually.
Even if the temperature drops, power will not be supplied. As explained above in detail, according to the electric floor heater according to the present invention, (4) a part of the temperature control device is destroyed or disconnected due to surge voltage, etc., and the temperature control device becomes uncontrollable. Even if power is continuously supplied to the planar heater, leakage or disconnection will occur before the temperature reaches an abnormal state, thereby preventing the occurrence of a fire. (B) Before the temperature becomes abnormal, there is a current leakage or a circuit disconnector is activated, but once this current leakage or circuit disconnector is activated, the power remains cut off and an abnormality suddenly occurs. Not only can this information be notified, but it can also improve safety. (C) Since the current leakage or disconnection circuit is directly used for overheating or disconnection, it has the effect of simplifying the circuit configuration.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing an embodiment of an electric floor heater according to the present invention, and FIG. 2 is a plan view showing the planar heater of FIG.
FIG. 3 is an internal wiring diagram showing the earth leakage and disconnection shown in FIG. 1. 1... AC power supply, 2... Leakage and disconnection, 3... Planar heater, 4... Temperature detection section, 5... ... Power control section, 6 ... Temperature control switch, 7 ... Temperature control device, 8 ...
...Trip coil, 9...Test button switch, 10a-10f...Diode, 1]a
~11c...Resistance, 12a and 12b...
... Capacitor, 13 ... Thyristor, 14
a and 14b...terminals. Note that the same numbers indicate the same or equivalent parts.

Claims (1)

[Claims] 1. An AC power source, a planar heater for floor heating, an earth leakage cutter with a trip coil that cuts off power to the planar heater when energized, and this surface thermally coupled with a shaped heater,
a temperature control device comprising a temperature detection section that turns on and off depending on the temperature of the sheet heater and outputs a temperature detection signal; and a power control section that operates in response to the temperature detection signal and controls the current flowing through the sheet heater; thermally coupled with a sheet heater,
One or more heaters are arranged depending on the size of the heater, and when the temperature of the heater locally rises to an abnormal temperature and reaches the switching temperature, it turns on and prevents electrical leakage and disconnection. An electric floor heater characterized by comprising a temperature control switch that energizes a trip coil. 2. The electric floor heater according to claim 1, characterized in that a thermostat or a thermal reed relay is used as the temperature control switch. 3. The electric floor heater according to claim 1, characterized in that a plurality of temperature control switches are connected in series or in parallel. 4. The electric floor heater according to claim 1, characterized in that a single-phase or multi-phase AC power source is used as the AC power source. 5. The electric floor heater according to claim 1, wherein the temperature control switch is connected in parallel to a test button switch for leakage or disconnection.