JP3048105B2 - Electric carpet control equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric carpet, and more particularly to control of energization of a heater.

[0002]

2. Description of the Related Art A conventional electric carpet control device is shown in FIG.
Is configured as shown in the block diagram of FIG. That is, a comparator 5 is connected via a series circuit of an AC power supply 1, a power switch 2, a temperature-regulating variable resistor 3 and a rectifier diode 4.
And a sensor line 6 laid in the electric carpet between the connection point and the ground. The output signal of the comparator 5 is connected to a relay driving unit A8 and a relay driving unit B9 via a surface changeover switch 7 for switching a heating area, and a heater A10 and a heater B11 linked to the relay driving unit.
Is turned on and off. The sensor wire 6 is laid in parallel with the heater in the electric carpet, and the primary wire and the secondary wire are provided via an insulating layer.
The temperature change of the electric carpet heated by the heater is detected by the sensor line 6 and output as a change in impedance. That is, the impedance decreases as the temperature increases, and increases as the temperature decreases. Accordingly, a resistance value determined by setting the variable resistor 3 to a desired temperature and a detection voltage determined by the impedance detected by the sensor line 6 are input to the minus input terminal of the comparator 5 and input to the plus input terminal. The detected reference voltage 12 is compared with the detected voltage (negative input terminal). If the detected voltage is higher than the reference voltage 12, an output signal is transmitted.

[0005] However, the above-described electric carpet control device is capable of controlling the change in the impedance of the sensor wire 6 laid in parallel with the heater inside the electric carpet, as shown in the graph of FIG. Since the heater is intermittently energized by the difference between the detection voltage determined by setting the variable resistor 3 and the reference voltage 12, the impedance of the sensor line 6 is actually laid in parallel with the heater when the power is turned on. In response to the change, combined with the fact that the material of the electric carpet is fibrous and highly insulating,
Because it is common to put a carpet cover,
Before the temperature of the surface of the electric carpet and the carpet cover rises to reach the set temperature, the output signal of the comparator 5 is stopped due to the change in the impedance of the sensor wire 6 heated by the heater. Therefore, there is a problem that it takes time until the surface temperature of the electric carpet reaches the set temperature. There is also a method that accelerates the temperature rise by turning on the heater for a certain period of time after turning on the power. It is not a time setting, and from the viewpoint of safety, it is not possible to lengthen the energizing time after turning on the power, especially when the room temperature is low and the electric carpet is completely cold, There was a problem that it took time.

[0004] On the other hand, the energization rate of the heater after the temperature of the electric carpet has risen is generally 50% or less. However, in the case of an electric carpet in which the surface to be heated can be divided into a plurality of parts and only the required surface can be energized, when heating the entire area of the electric carpet, a plurality of relay driving units are activated by the output signal of the comparator 5. Since the heaters are operated at the same time to energize a plurality of heaters at the same time, the input current becomes large, and the current input to the electric carpet is reduced in relation to the power consumption of other devices on the side of use. It is desirable to keep the undulations small. In addition, the degree of warmth felt by the human body of the electric carpet is felt by the residual temperature of the entire carpet including the carpet cover after reaching the predetermined temperature, so the energization rate is slightly shortened and the set temperature as an upper limit, If the temperature is kept below this set temperature, electric power will be saved while maintaining the warmth of the electric carpet felt by the human body, and an electric carpet that is generally desired for the human body and saves energy will appear. .

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and detects the temperature of the electric carpet at the time of turning on the power, and continues energizing the heater until the set temperature is reached. An object of the present invention is to provide an electric carpet that reduces the power consumption by increasing the surface temperature in a shorter time and, after the temperature rises, alternately energizing a heater provided for each surface to be heated.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a first invention of the present application is to provide a variable resistor, a rectifier diode, and a sensor provided on a carpet through an AC power supply via a power switch. A series circuit with a line is connected, a connection point between the rectifier diode and the sensor line is connected to a minus input terminal of a comparator, a reference voltage is input to a plus input terminal of the comparator, and an output signal of the comparator is output. Through a changeover switch, in an electric carpet that controls energization to a plurality of relay driving units and a heater, a detection unit that detects a voltage at the connection point,
A conversion unit that converts the detected voltage into time, a timer unit that counts the converted time and sends an open / close signal, a switching unit that alternately operates a plurality of relay driving units according to the open / close signal, and the conversion unit. And a control section for controlling the timer section and the relay drive section. A second invention of the present application relates to the first invention of the present application, wherein a plurality of the relay driving units are simultaneously operated via the switching unit by an output signal of the comparator.

[0007]

As described above, according to the electric carpet of the present invention, as a first invention, when the power switch of the electric carpet is turned on, the resistance value determined by setting the variable resistor to a desired temperature is set. The detection unit detects a voltage determined by the impedance detected by the sensor line and the sensor line.The conversion unit converts the level of this voltage into time, the timer unit counts the converted time, and sends out an energization start signal. When the relay drive section is operated via the control section and the switching section to energize the heater, and when the time reaches a predetermined time corresponding to the temperature (detection voltage) of the sensor wire at power-on, the timer section An energization stop signal is sent to the control unit, and the control unit stops the operation of the relay driving unit and cuts off the energization to the heater. Since the relay drive unit is operated by the output signal of the comparator at the same time as the above operation, after a predetermined time has elapsed from the time when the power is turned on and after a predetermined time has elapsed, the operation of the comparator is started. The output signal is switched by the switching unit to a signal that alternately operates the plurality of relay driving units, and power is supplied to the heaters provided on the respective heating surfaces alternately. As a second invention,
A plurality of the relay drive units are simultaneously operated via the switching unit in response to the output signal of the comparator, and power is simultaneously supplied to the heaters provided on the respective heating surfaces.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of a control device for an electric carpet of the present invention. FIGS. 2A and 2B are waveform diagrams showing changes over time in energization of a heater of the control device for an electric carpet of the present invention. FIG. 2A shows an output signal of a comparator, FIG. 2B shows an output signal on an electric carpet A surface, and FIG.
Represents the output signal to the B side. FIG. 3 is a graph showing the surface temperature of the electric carpet in FIGS. 2B and 2C. In the description of the present embodiment, among the above-described prior arts, those having the same functions are denoted by the same reference numerals, and detailed description is omitted as in the above description. In the figure, reference numeral 21 denotes a detection unit, which is connected between a connection point between the rectifier diode 4 and the sensor line 6 and a control unit 22, and which is set when the electric carpet is powered on. Resistance value and the sensor line 6
And a voltage obtained by a resistance value determined by the impedance of the control signal is sent to the control unit 22. Reference numeral 23 denotes a conversion unit that converts time into time in proportion to the detection voltage of the detection unit transmitted through the control unit 22. In the 24 timer section,
The signal of the conversion unit 23 transmitted through the control unit 22 is counted, and an energization time is set and transmitted to the control unit 22. Then, the control unit 22 converts the power into a power source for operating the relay driving unit and sends it to the switching unit 25.

The switching unit 25 activates the relay driving unit A and the relay driving unit B via the surface switching switch 7 from the time of turning on the power until a set time, and the heater A 10
When the heater B11 is energized and the set time is reached, the timer unit 24 sends a stop signal to activate the relay driving unit A and the relay driving unit B via the control unit 22 and the switching unit 25. Stop the heater A1
0 and the power supply to the heater B11 are stopped. Next, the intermittent output signal of the comparator 5 is output to the switching unit 2.
5 receives and converts them into alternately switched output signals, whereby an odd-numbered output signal is sent to one common of the surface changeover switches 7 and an even-numbered output signal is sent to the other common. Each relay drive unit is operated alternately to energize the heater.

In the above configuration, when the temperature (room temperature) of the electric carpet is low, the impedance of the sensor line 6 is large, and the detected voltage is high. On the other hand, when the temperature (room temperature) of the electric carpet is high, the impedance of the sensor line 6 is small. The detected voltage is also low. So, for example,
When the surface temperature of the electric carpet at the time of turning on the power switch 2 is 10 ° C., the energizing time is 30 minutes, and when the surface temperature is 20 ° C., the energizing time is 20 minutes. Converts the temperature into time, the power is supplied for a time corresponding to the temperature (detection voltage) of the sensor line 6 at the time of power-on, and after the electric carpet rises to a predetermined temperature, the output signal of the comparator 5 becomes Thus, the relay drive section is alternately operated via the switching section 25 so that the heater is energized. Therefore, when the power is turned on, the temperature rise is accelerated, and after the temperature rise, the duty ratio is shortened to keep the temperature within the set temperature, so that the warmth felt by the human body can be maintained and the power consumption can be reduced. In the second invention of the present application, both of the relay driving units are simultaneously operated via the switching unit 25 by the output signal of the comparator 5 after a predetermined energizing time has elapsed since the power was turned on, thereby increasing the energizing ratio. Particularly when the room temperature is low, the surface temperature of the electric carpet is increased.

[0011]

As described above, according to the present invention, the energizing time is set in accordance with the room temperature when the power is turned on, so that the surface temperature of the electric carpet can be raised in a shorter time. In addition, since the energization time varies with fluctuations in room temperature, the temperature does not rise abnormally and has a safety effect. In this case, the effect of reducing power consumption and reducing power consumption by lowering the temperature below the set temperature with the set temperature as the upper limit is significant.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of a control device for an electric carpet of the present invention.

FIG. 2 is a waveform diagram showing a change over time of an output signal (heater energization time) of the electric carpet control device of the present invention;
(A) shows the output signal of the comparator, (B) shows the output signal of the switching unit to the A surface, and (C) shows the output signal of the switching unit to the B surface.

FIG. 3 is a graph showing changes in the surface temperature of the electric carpet in FIGS. 2B and 2C.

FIG. 4 is a block diagram showing one embodiment of a conventional electric carpet control device.

FIG. 5 is a graph showing a change in the surface temperature of the electric carpet in FIG. 4 described above.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Power supply 2 Power switch 3 Variable resistor 4 Rectifier diode 5 Comparator 6 Sensor wire 7 Surface changeover switch 8 Relay drive part A 9 Relay drive part B 10 Heater A 11 Heater B 12 Reference voltage 21 Detection part 22 Control part 23 Conversion part 24 Timer section 25 Switching section

Claims (2)

(57) [Claims] 1. A series circuit of a variable resistor, a rectifier diode, and a sensor line provided on a carpet is connected to an AC power supply via a power switch, and a connection point between the rectifier diode and the sensor line is compared with a comparator. An electric carpet that is connected to a negative input terminal of the comparator, inputs a reference voltage to a positive input terminal of the comparator, and controls an output signal of the comparator via a change-over switch to control energization of a plurality of relay driving units and heaters. A detecting unit for detecting the voltage at the connection point, a converting unit for converting the detected voltage into time, a timer unit for counting the converted time and transmitting an open / close signal, and a plurality of relays based on the open / close signal. A switching unit that alternately operates a driving unit, and a control unit that controls the conversion unit, the timer unit, and the relay driving unit. A control device for an electric carpet, comprising: 2. The electric carpet control device according to claim 1, wherein a plurality of said relay driving units are simultaneously operated via said switching unit by an output signal of said comparator.