JP4284876B2 - Electric floor heater - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric floor heating apparatus suitable for controlling a heating element with high power consumption incorporated in a planar structure.
[0002]
[Prior art]
Conventionally, as this type of electric floor heating device, for example, there is one shown in FIG. In FIG. 10, the temperature of the heating element 1 incorporated in the planar structure is detected by a thermally coupled temperature sensor unit 2, and signals from the temperature setting unit 3 and the temperature sensor unit 2 are detected by the temperature control unit 4. As a result of comparison processing, when the temperature is low, the coil portion 6 of the relay 5 is energized to close the contact portion 7, the AC power is supplied to the heating element 1 to increase the temperature, and the temperature becomes high The energization to the coil part 6 of the relay 5 is stopped and the contact part 7 is opened. In this way, the temperature is controlled to a predetermined temperature by repeatedly opening and closing the contact portion 7 of the relay 5.
[0003]
[Problems to be solved by the invention]
However, in the conventional configuration, when the power consumption of the heating element 1 is set to be large, it is necessary to increase the capacity of the contact portion 7 of the relay 5. In particular, in order to satisfy the switching life of the contact portion 7, A fairly high contact capacity is required. And as the contact capacity increases, the relay shape becomes larger and the dimensions of the case that houses the relay become thicker and larger, so that things that are used on the floor, such as electric carpets, need to be thinned so that they will not trip over. However, there is a problem that this requirement cannot be satisfied.
[0004]
The present invention solves the above-described conventional problems, and an object of the present invention is to provide an electric floor heating apparatus that obtains a relay shape that satisfies the thickness of the case and that also has sufficient open / close life of a contact portion of the relay.
[0005]
[Means for Solving the Problems]
In order to solve the above-described conventional problems, the electric floor heating apparatus of the present invention includes a plurality of relay contact points connected in parallel to the heating element in order to perform energization control of the heating element incorporated in the planar structure. is there. By connecting the contact portions of a plurality of relays in parallel to this heating element, the number of times of opening and closing per contact portion of the relay is reduced. Further, the switching life of the contact portions can be averaged by randomly determining the driving of the contact portions of the plurality of relays based on the signal from the random generating portion.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The invention according to claim 1 includes a heating element incorporated in a planar structure, a temperature sensor unit for detecting the temperature of the heating element, a temperature setting unit for setting the temperature of the heating element, and the temperature sensor unit. and a temperature control unit for controlling the temperature of the heating element to a predetermined temperature by processing a signal of the temperature setting unit, and the contact portions of the plurality of relays connected in parallel to the heating element to operate at an output of said temperature control unit Determining the contact points of the plurality of relays to be driven by a signal of the random generator, thereby reducing the number of times of opening / closing per relay contact and reducing the capacity of the relay contact And it can be set as a relay with a small shape. In addition, the relay to be operated can be determined at random, and the switching life can be averaged.
[0007]
According to a second aspect of the present invention, there is provided a heating element incorporated in a planar structure, a temperature sensor unit that detects a temperature of the heating element, a temperature setting unit that sets a temperature of the heating element, and the temperature sensor unit A temperature control unit that processes a signal of the temperature setting unit to control the temperature of the heating element to a predetermined temperature, and a plurality of relay contact points that are operated by the output of the temperature control unit and connected in parallel to the heating element. , Comprising a power switch and a storage unit, the relay that was first operated when the power switch was turned on is stored in the storage unit, and the relay that is not stored in the storage unit is first operated when the power switch is turned on next time By doing so, it is possible to prevent fixing of the relay that operates first when the power switch is turned on, and the switching life is averaged.
[0008]
According to a third aspect of the present invention, in the electric floor heating apparatus according to the first or second aspect of the present invention, the relay floor time difference driving unit is provided, and the contact portion of one of the relays is in operation. By operating the contact portions of other relays, the temperature rise of the contact portions can be suppressed and the life of the contact portions can be extended.
The invention according to claim 4 is the electric floor heating device according to any one of claims 1 to 3 , particularly comprising a relay operation state detection unit, and monitoring the open / closed state of the contact part of the relay. By detecting the progress of the switching life of the relay and determining the relay to be driven according to the progress, the switching life is further averaged.
[0009]
【Example】
Embodiments of the present invention will be described below with reference to FIGS.
[0010]
Example 1
FIG. 1 shows a configuration diagram of an electric floor heating apparatus according to Embodiment 1 of the present invention. In FIG. 1, reference numeral 11 denotes a heating element which is incorporated in a planar structure and serves as a heating source such as a planar electric carpet. A temperature sensor unit 12 is thermally coupled so as to detect the temperature from the heating element 11. A temperature setting unit 13 sets a desired temperature. A temperature control unit 14 compares the temperature signal detected by the temperature sensor unit 12 with the setting signal of the temperature setting unit 13. Reference numerals 15 and 16 are relays which are constituted by coil parts 17 and 18 and contact parts 19 and 20 which are driven by an output from the temperature control part 14, and contact parts 19 and 20 are connected in parallel.
[0011]
In the electric floor heating apparatus configured as described above, when the temperature control unit 14 determines that the temperature detected by the temperature sensor unit 12 is lower than the set temperature of the temperature setting unit 13, the coil unit 17 of the relay 15 or the relay The sixteen coil portions 18 are driven, and either the corresponding contact portion 19 or 20 is closed to energize the heating element 11. When the temperature control unit 14 determines that the temperature is increased by energizing the heating element 11 and the temperature detected by the temperature sensor unit 12 is higher than the set temperature of the temperature setting unit 13, The energization is stopped, the corresponding contact portion 19 or 20 is opened, and the energization to the heating element 11 is stopped. As described above, the temperature set by the temperature setting unit 13 is controlled by repeatedly opening and closing the contact portion 19 or 20.
[0012]
Therefore, by connecting the contact portion 19 and the contact portion 20 in parallel and switching the contact portion to be used to control the energization of the heating element 11, the number of times of opening and closing of the contact portions 19 and 20 can be reduced. Can be reduced.
[0013]
(Example 2)
2 and 3 show a configuration diagram and an operation diagram of the electric floor heating apparatus according to the second embodiment of the present invention. In the present embodiment, 21 relay sequential drive units receive the output from the temperature control unit 14 and drive the relays 15 and 16. The relay sequential drive unit 21 drives the relay 15 when receiving the relay ON signal from the temperature control unit 14 at time t1. When the relay-off signal is received at time t2, relay 15 is turned off. When the relay-on signal is received again at time t3, the relay 16 is driven this time, and the relay 16 is turned off by the relay-off signal at the next time t4. When the relay ON signal is received again at time t5, the relay 15 is driven. By sequentially switching the relays used in this way, the number of times of opening and closing of the relays 15 and 16 can be averaged at any time, and a more stable switching life can be obtained. When there are two contact points as shown in FIG. 2, the contact points 19 and 20 are operated alternately.
[0014]
(Example 3)
FIG. 4 shows a block diagram of an electric floor heating apparatus in Embodiment 3 of the present invention. In this embodiment, the temperature control unit 14 determines which of the contact points of the relay 15 and the relay 16 is driven based on the signal of the 22 random generation units, and the contact point of the corresponding relay 15 or relay 16. The unit 19 or 20 is driven. Thus, by driving the relays at random, the number of times the relays 15 and 16 are opened and closed can be averaged, and a stable switching life can be obtained.
[0015]
Moreover, it becomes possible to prevent the contact part of the relay to be driven from being fixed under certain conditions. For example, when a PTC heater that generates a large inrush current when the AC power is turned on is used as the heating element 11, the relay that operates first when the AC power is turned on is fixed to the relay 15. A large inrush current flows only to the 15 contact portions 19, and only the contact portions 19 deteriorate. Since such a problem can be solved, the open / close life is averaged and a long life is obtained.
[0016]
(Example 4)
5 and 6 show a configuration diagram and an operation diagram of the electric floor heating apparatus according to the fourth embodiment of the present invention. In this embodiment, when the relay time difference drive unit 23 receives the relay-on signal from the temperature control unit 14 at time t1, the relay 15 is operated, and the relay 16 is also operated at time t2 when the relay 15 is operating. When the relay 16 is operated, the current flowing through the heating element 11 is divided, the current flowing through the contact portion 19 is reduced, and the temperature rise of the contact portion 19 is reduced. When the relay time difference drive unit 23 receives the relay off signal from the temperature control unit 14 at time t3, the relay 16 is turned off and then the relay 15 is turned off. As described above, the relay 15 receives a load when the contact portion 19 is opened and closed, but the load is reduced during the operation, and the contact portion 20 of the relay 16 receives no load during the opening and closing, and the load is applied only during the operation. Will receive. Accordingly, the contact portion 19 of the relay 15 is prevented from rising in temperature and has a longer life than operating alone. Furthermore, the switching time of a some relay can be averaged by switching which contact part is operated during operation | movement of another relay about the contact part of a some relay in the relay time difference drive part 23. FIG.
[0017]
(Example 5)
FIG. 7: shows the block diagram of the electric floor heating apparatus in Example 5 of this invention. In this embodiment, when the power switch of 24 is turned on, the contact portion of the relay operated first is stored in the storage unit of 25, and when the power switch 24 is turned on next time, it is stored in the storage unit 25 of the previous time. By operating the contact portion of the relay, it is possible to prevent the contact portion of the relay that is turned on first when the power switch 24 is turned on from being fixed. Therefore, for example, even when a PTC heater in which a large inrush current flows when the power switch 24 is turned on is used for the heating element 11, since the large inrush current becomes a load on the contact portion of each relay, the switching life is averaged. As a result, only one relay can be prevented from deteriorating.
[0018]
(Example 6)
8 and 9 show a configuration diagram and an operation diagram of the electric floor heating apparatus according to the sixth embodiment of the present invention. In this embodiment, 26 relay operation state detection units are configured by 26 diodes and 27 transistors, and the open / close states of the contact portions 19 and 20 are monitored. In the operation, when the contact portion 19 or 20 is in an open state, the transistor 27 of the relay operation state detection unit 28 is off, so that the potential at the point a is continuously at the Hi level. On the contrary, when the contact portion 19 or 20 is in the closed state, the transistor 27 of the relay operation state detection unit 28 repeats ON / OFF in synchronization with the AC power supply, so that the potential at the point a repeats the Lo level and the Hi level. The contact portion 19 or 20 causes a welding phenomenon as the number of times of opening and closing increases. This welding phenomenon is a state in which the contact portion 19 or 20 continues to be closed even when the energization to the coil portion 17 or 18 is stopped at time t1, and the duration that is maintained by the relay varies. The level of the output a point of the relay operation state detection unit 28 continuously becomes the Hi level from the welding time ta in which this welding phenomenon occurs, that is, when the energization to the coil unit 17 or 18 is stopped (t1). By measuring the time (t2) to be used and preferentially using the contact portion having a short welding time ta, the switching life is further averaged and a long life is obtained.
[0019]
【The invention's effect】
As described above, according to the first to fourth aspects of the present invention, the number of opening / closing of the relay contact portion per one can be set smaller than the number of opening / closing per necessary product. For example, when two relays are used, one relay can be set to ½ the number of opening / closing times required by the product. In addition, it is possible to prevent the relays used in the plurality of relays from being fixed, and furthermore, the relays can be used according to the life deterioration of the contact points of the relays, so that the lifespan of the plurality of relays can be averaged. it can. Therefore, even if the current capacity of the contact portion of the relay is small, a long life can be obtained, the relay shape becomes small, and the case for housing the relay can be made thin.
[Brief description of the drawings]
FIG. 1 is a block diagram of an electric floor heating apparatus according to a first embodiment of the present invention. FIG. 2 is a block diagram of an electric floor heating apparatus according to a second embodiment of the present invention. FIG. 4 is a block diagram of an electric floor heating apparatus according to a third embodiment of the present invention. FIG. 5 is a block diagram of an electric floor heating apparatus according to a fourth embodiment of the present invention. FIG. 7 is a block diagram of an electric floor heating device according to a fifth embodiment of the present invention. FIG. 8 is a block diagram of an electric floor heating device according to a sixth embodiment of the present invention. Operational diagram of electric floor heating apparatus in Example 6 of the present invention [Fig. 10] Configuration diagram of a conventional electric floor heating apparatus [Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Heating body 12 Temperature sensor part 13 Temperature setting part 14 Temperature control part 15, 16 Relay 19, 20 Contact part 21 Relay sequential drive part 22 Random generation part 23 Relay time difference drive part 24 Power switch 25 Memory | storage part 28 Relay operation state detection part

Claims (4)

A heating element incorporated in a planar structure, a temperature sensor unit that detects the temperature of the heating element, a temperature setting unit that sets the temperature of the heating element, and signals from the temperature sensor unit and the temperature setting unit A temperature control unit that controls the temperature of the heating element to a predetermined temperature, a plurality of relay contact points that operate in accordance with the output of the temperature control unit and are connected in parallel to the heating element, and a random generation unit, An electric floor heating apparatus in which contact portions of the plurality of relays driven by a signal from the generation unit are determined . A heating element incorporated in a planar structure, a temperature sensor unit that detects the temperature of the heating element, a temperature setting unit that sets the temperature of the heating element, and signals from the temperature sensor unit and the temperature setting unit A temperature control unit that controls the temperature of the heating element to a predetermined temperature, a plurality of relay contact points that operate in accordance with the output of the temperature control unit and are connected in parallel to the heating element, a power switch, and a storage unit, stores contact portion of the relay initially operated during on of the power switch in the storage unit, formed by operating the contact portion of the relay other than that stored in the storage unit in the first when on the next power switch Electric floor heater. The electric floor heating apparatus according to claim 1, further comprising a relay time difference driving unit, wherein the contact part of another relay is operated while the contact part of one of the relays is operating. A relay operation state detector, the electric floor heating device according to any one of claims 1 to 3 comprising monitoring the opening and closing state of the contact portion of the relay in the relay operating state detection unit.

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