JPH04249879A - Electronic carpet - Google Patents

Abstract

PURPOSE:To improve the efficiency of electric heat control by providing the electric heat control of a carpet with an adaptive control function and a learning control function. CONSTITUTION:An alternate current if fed to a heater wire 2 embedded in a carpet 10 to heat it and the alternate current fed to the heater wire 2 is subjected to power control so that the carpet temperature Tc may agree with a desired temperature Ts and at the same time, the carpet temperature Tc is periodically compared with the desired temperature Ts, and according to a temperature difference Ts-Tc obtained by the periodical comparison, a control unit 13 corrects a power supply quantity in relation to the temperature difference Ts-Tc so that the electric heat of the carpet 10 can be effectively controlled by effective use of AC power.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic carpet that has an adaptive control function and a learning control function for electric heating control of the carpet.

0002

2. Description of the Related Art Electric heat control devices that use electrical energy as a heat source have been put to practical use in a variety of applications, such as heating appliances, cooking appliances, and sanitary appliances. The major difference between electric heat control devices such as electric kotatsu and electronic carpets compared to motor control devices and lamp control devices is that the time constant of the electric heat load is large, allowing for a certain degree of slow control. However, the so-called on-off control method, in which the connection between the load and the power source is switched on and off depending on the polarity of the control deviation, is often used for electric heating control of electronic carpets.

The electronic carpet 1 shown in FIG. 4 is a device for controlling a carpet 10 in which a heater wire 2 is embedded to a desired temperature, and the heater wire 2, which generates heat when energized,
AC power supply 4 via a power switch 3 such as a triac
It is connected to. The temperature sensor 7 has a structure in which a heat-sensitive wire 9 receives a current flowing from the heater wire 2 through a heat-sensitive resin material 8, and senses the carpet temperature Tc according to the value of the current flowing into the heat-sensitive wire 9. The temperature sensor 7 is stretched over the entire carpet 10 in a meandering manner.
detects the average temperature of the entire carpet as the carpet temperature Tc. The desired temperature Ts set via the temperature setting device 5 is compared with the carpet temperature Tc, which is the output of the temperature sensor 7, in an arithmetic circuit 6 equipped with a microcomputer function, and if the carpet temperature Tc is less than the desired temperature Ts. As shown in FIGS. 5A and 5B, the power switch 3 is closed in response to a command from the arithmetic circuit 6, and the temperature is increased by continuous energization. When the carpet temperature Tc exceeds the desired temperature Ts, the power switch 3 is opened at that point, and the state is maintained until the carpet temperature Tc drops several degrees from the desired temperature Ts due to heat dissipation from the surface of the carpet 10. Ru. The arithmetic circuit 6 includes a temperature sensor 7
The carpet temperature Tc reaches the desired temperature T at the time of output capture.
If the temperature has dropped to a certain level or more from s, the power switch 3 is closed to raise the temperature by continuous energization, and the carpet temperature Tc is controlled to approach the desired temperature Ts.

0004

[Problems to be Solved by the Invention] The above-mentioned conventional electronic carpet 1 opens the power switch 3 when the carpet temperature Tc exceeds the desired temperature Ts, and the carpet temperature Tc is set to the desired temperature by heat dissipation from the surface of the carpet 10. Temperature T
It remains in this state until it drops several degrees below s. Therefore, the actual carpet temperature Tc is the desired temperature Ts
The control is variably controlled within a certain range on the lower side, and there is a period when the carpet surface feels directly warm against your skin (the period when power switch 3 is on), and a period when you feel somehow warm just from the residual heat ( The period during which the power switch 3 was turned off was clear, and this was far from a comfortable heat retention effect with little change in perceived temperature. Furthermore, since the carpet temperature Tc swings below the desired temperature Ts, the carpet temperature must be set to a higher temperature, which is contrary to the goal of saving heating costs.

Furthermore, the power supply to the heater wire 2 is as follows:
Depending on the comparison result between the desired temperature Ts and the actual carpet temperature Tc, the control is performed by either energizing with the maximum supplied power or completely cutting off the energization, so that the heat dissipation from the carpet 10 is maximized. During the severe winter season, a steady deviation continues to exist between the desired temperature Ts and the carpet temperature Tc, or a large number of people ride on the carpet 10 at the same time, so the heat load on the carpet 10 increases. Steady-state deviations may still be unavoidable, and on the other hand, in early autumn or early spring, the electrical heating capacity exceeds the heat load, resulting in slightly overheating.
For comfortable heating, the desired temperature Ts may have to be lowered somewhat.

[0006]

[Means for Solving the Problems] The present invention has solved the above-mentioned problems, and heats a heater wire embedded in a carpet by passing an alternating current through it, and also heats the heater wire so that the carpet temperature matches a desired temperature. A control means for controlling the power of alternating current applied to the line periodically compares the carpet temperature with a desired temperature, and according to the temperature difference obtained from the comparison, corrects the amount of power supplied by the control means for the temperature difference. The present invention is characterized by comprising a correction means for.

[0007]

[Operation] This invention heats the heater wires embedded in the carpet by supplying alternating current to the heater wires, and controls the power of the alternating current supplied to the heater wires so that the carpet temperature matches the desired temperature. By periodically comparing the values and correcting the amount of power supplied for the temperature difference according to the temperature difference obtained from the comparison, AC power is effectively used to efficiently control electric heating of the carpet.

[0008]

Embodiments Examples of the present invention will be described below with reference to FIGS. 1 to 3. FIG. 1 is a circuit configuration diagram showing an embodiment of the electronic carpet of the present invention, FIG. 2 is a signal waveform diagram of each part of the circuit shown in FIG. 1, and FIG. 3 is a temperature control diagram of the electronic carpet shown in FIG. FIG. 3 is a block diagram for explaining the operation.

The electronic carpet 11 shown in FIG.
The opening/closing is controlled by 3. Zero voltage sensor 1
3 detects that the output voltage of the AC power supply 4 crosses zero voltage, and outputs a zero-crossing detection pulse with a very short pulse width shown in FIG. 2(B) at the time of detection. In the example,
Since a triac is used as the power switch 3, the zero cross trigger pulse generation circuit 14 connected to the AC power source 4 is used to generate a zero cross trigger pulse that is in phase with the output voltage of the AC power source 4, similar to the output zero cross detection pulse of the zero voltage sensor 12. The trigger phase of the power switch 3 always matches the power supply phase.

The control unit 13 cyclically counts the zero cross detection pulses of the zero voltage sensor 12 up to a certain value, which corresponds to a very short time, for example, less than one second in terms of counting time, and Trigger pulses are supplied to the power switch 3 via the zero-cross trigger pulse generation circuit 14 during a series of counting periods whose ends are defined by two counts. In the embodiment, a 4-bit counter circuit 15 outputs a reset signal at the counting point of 1111, which is the upper limit of counting, and the count value of this counter circuit 15 is compared with a predetermined value latched by the latch circuit 16, and the time point when the two match is determined. Comparator circuit 1 that outputs a set signal at
7, a flip-flop circuit 18, etc., which is set or reset in response to the set signal of the comparator circuit 17 and the reset signal of the counter circuit 15, and drives the zero cross trigger pulse generation circuit 14 with the set output or reset output. .

The latch circuit 16 is given 4-bit data proportional to the amount of supplied power corrected according to the temperature difference Ts-Tc via the arithmetic circuit 19, and until the next latch command is given, The data is sent to the comparator circuit 17
It serves as a reference standard for comparison. In the embodiment, 4 from 0000 to 1111 are latched in the latch circuit 16.
The bit data corresponds to the amount of power E supplied to the heater wire 2, and is corrected to increase when the carpet temperature Tc is lower than the set temperature Ts, and is corrected to decrease when the carpet temperature Tc is higher than the set temperature Ts. Ru. On the other hand, the counter circuit 15 that counts the output zero cross detection pulses of the zero voltage sensor 12 sends a reset signal to the flip-flop circuit 18 when the count value reaches 1111, that is, when 16 zero cross detection pulses are counted. supply. Therefore, with the arrival of one control period T corresponding to eight times the power supply period, the flip-flop circuit 1
8 is reset, and at the same time, driving to the zero cross trigger pulse generation circuit 14 is stopped. As a result, the supply of the zero cross trigger pulse to the power switch 3 is cut off, and the energization to the heater wire 2 is interrupted. When the energization to the heater wire 2 is interrupted, the counter circuit 15, which sets the count value 1111 as the upper limit, starts counting again from 0000, and the count value matches the predetermined value latched in the latch circuit 16, in this case 0011. The comparator circuit 17 outputs a set signal at this time, that is, at the time when the fourth zero-crossing detection pulse is counted after the flip-flop circuit 18 is reset. As a result, the flip-flop circuit 18 is set, and the zero-cross trigger pulse generation circuit 1
4 is driven again, a zero cross trigger pulse is given to the power switch 3, and the power supply to the heater wire 2 is restarted.

Note that the counter circuit 15 is reset when 16 half waves have been counted, so if the power supply frequency is set to 50 cycles, 8/50 seconds is one control period T.
becomes. Therefore, the constant value 1111 set in the counter circuit 15 corresponds to a very short time of about a fraction of a second in terms of counting time, and it can be said that it can respond to load fluctuations with a correspondingly short cycle.

By the way, the temperature setting device 20 connected to the arithmetic circuit 19 is constructed of an electronic volume or the like, and the desired temperature Ts set by the volume operation is sampled by the temperature sensor 7 within the arithmetic circuit 19. It is compared with the carpet temperature Tc. At this time, the arithmetic circuit 19 determines that the electric power obtained by adding or subtracting the correction value ΔE corresponding to the temperature difference Ts-Tc obtained by the comparison is
The data given to the latch circuit 16 is varied so that the data is supplied to the latch circuit 16, and the energization rate Ton/T of the power switch 3 controlled by the control section 13 is variably controlled.

In the embodiment, a configuration is adopted in which the amount of supplied power is varied in accordance with the load condition, so that the arithmetic circuit 1
9 includes a ROM 21 that stores a reference power supply amount Eo corresponding to the temperature difference Ts - Tc between the desired temperature Ts and the actual carpet temperature Tc, and a ROM 21 that stores a reference power supply amount Eo stored in this ROM 21 as an initial power supply amount. On the other hand, a RAM 22 is connected to store the supply power amount E, which changes every moment during the adaptive control process, while updating it with the latest supply power correction value ΔE. Electronic carpet viewed as an electric heating control system 1
The block diagram of 1 is as shown in Figure 3, and the ROM
21 provides the standard supply power Eo required by the arithmetic circuit 19 when the electronic carpet 11 is used for the first time;
22 first stores the reference power supply amount Eo given from the ROM 21, and then stores the latest power supply amount E directly given from the arithmetic circuit 19.

[0015] Here, the latest power supply amount E stored in the RAM 22 is determined by the arithmetic circuit 19 periodically comparing the carpet temperature Tc and the desired temperature Ts, and when the carpet temperature Tc is smaller than the set temperature Ts. Add the correction value ΔE,
Further, when the carpet temperature Tc is higher than the set temperature Ts, the correction value ΔE is subtracted, and the carpet temperature Tc is determined by subtracting the correction value ΔE based on the immediately previous control result and adapting to the state of the electrothermal control system. Therefore, for example, in the middle of winter when heat dissipation from the carpet 10 is at its maximum, the arithmetic circuit 19 calculates the temperature difference Ts.
- It is possible to correct the supplied power amount E corresponding to Tc to be larger than usual, and eliminate the steady deviation that occurs between the desired temperature Ts and the carpet temperature Tc. In addition, even when the heat load on the carpet 10 increases due to a large number of people riding on the carpet 10 at the same time, the steady state deviation can be similarly eliminated. By making the reference power supply amount Eo smaller than usual, it is possible to avoid the inconvenience that the carpet temperature Tc is kept higher than the desired temperature Ts and a steady deviation remains.

[0016] In this way, the electronic carpet 11 has the following features:
When heat dissipation factors from the carpet 10 change, such as the number of people on the carpet 10 or the ambient temperature that changes depending on the season, the control mode can be automatically adapted to match this change. The carpet 10 can be efficiently electrically heated by effectively utilizing the power. In addition, since the arithmetic circuit 19, which is a correction means, updates and registers the latest supplied power amount E in the RAM 22, control data necessary for adaptive control can be learned and stored, and as a result, the number of people on the carpet 10 changes. Carpet 10
Appropriate electrical heat control can be performed at the same time as the power is turned on when the amount of heat dissipation changes due to changes in the heat load of the room, or changes in the average room temperature due to seasonal changes.

Further, in the control period T in which the power switch 3 has one period eight times the power supply period, 12/16·T is an on period Ton, and the remaining 4/16·T is an off period Ton.
Since the opening/closing operation is performed with the heater Due to the large thermal time constant of line 2, the electrothermal control system has not been subject to detailed control in the past, but accurate temperature control with few errors is possible. In addition, by limiting the energization period Ton that occupies one control period T, power consumption can be freely controlled. Therefore, even when used in a general household where the breaker capacity is limited, the breaker capacity can be adjusted by selecting the power. It is possible to safely and efficiently consume power that does not exceed 100,000 yen, and it is possible to safely and safely use household electrical appliances such as rice cookers and irons that consume relatively large amounts of power. Further, since the trigger phase of the power switch 3 by the zero cross trigger pulse generation circuit 14 matches the power supply phase, no radio noise or the like is generated.

In the above embodiment, the counter circuit 15 is not limited to 4 bits, but may be 2 bits, 3 bits, or 5 bits or more, and the number of bits may be adjusted according to the resolution in power control. It is recommended to adopt Furthermore, the flip-flop circuit 18 may have the counter circuit 15 connected to the set input terminal and the comparator circuit 17 connected to the reset input terminal. In order to correspond to this, the latch data also takes on a larger value as the desired temperature becomes higher.

[0019]

Effects of the Invention As explained above, the present invention heats the heater wires embedded in the carpet by supplying an alternating current to the heater wires, and then converts the alternating current supplied to the heater wires into electrical power so that the carpet temperature matches the desired temperature. At the same time, the carpet temperature is regularly compared with the desired temperature, and the amount of power supplied is corrected according to the temperature difference obtained from the comparison. Unlike electronic carpets, etc., the number of people on the carpet,
When the heat dissipation factor from the carpet changes, such as the ambient temperature that changes depending on the season, the control mode of the electric heating control system can be automatically adapted to match this fluctuation. It has excellent effects such as being able to efficiently control electric heating.

[0020] Furthermore, the present invention provides a RAM in which the latest correction results are updated and registered in the correction means and whose stored contents can be read out at any time, thereby learning and storing control data necessary for the above-mentioned adaptive control. , the latest learning results are always available, so if the heat load on the carpet changes due to changes in the number of people on the carpet, or the average temperature in the room changes due to seasonal changes, the amount of heat dissipation changes. This has advantages such as being able to read out the latest control data necessary for adaptive control and immediately implement appropriate electrical heating control immediately after turning on the power.

[Brief explanation of the drawing]

FIG. 1 is a circuit configuration diagram showing an embodiment of an electronic carpet of the present invention.

FIG. 2 is a signal waveform diagram of each part of the circuit shown in FIG. 1;

FIG. 3 is a block diagram for explaining the temperature control operation of the electronic carpet shown in FIG. 1;

FIG. 4 is a circuit configuration diagram showing an example of a conventional electronic carpet.

FIG. 5 is a waveform diagram showing the progress of temperature control of the electronic carpet shown in FIG. 4;

[Explanation of symbols]

2 Heater wire 3 Power switch 4 AC power supply 10 Carpet 11 Electronic carpet 13 Control section 19 Arithmetic circuit 20 Temperature setting device 21 ROM 22 RAM

Claims (2)

[Claims] 1. A control means for heating a heater wire embedded in a carpet by supplying an alternating current to it and controlling the alternating current supplied to the heater wire so that the carpet temperature matches a desired temperature; An electronic carpet characterized by comprising a correction means for periodically comparing desired temperatures and correcting the amount of power supplied by the control means for the temperature difference according to the temperature difference obtained from the comparison. 2. The correction means is an RA in which the latest correction results are updated and registered, and the stored contents can be read out at any time.
The electronic carpet according to claim 1, characterized in that it has M.