JPH02264309A - Controller for electric carpet - Google Patents

Abstract

PURPOSE:To sufficiently raise the surface temperature of a carpet in a short time by continuing to energize to a heater until heater temperature reaches some temperature. CONSTITUTION:When a switch 2 is turned on, a current flows in the heater 4, and the heater temperature rises. At the time of the switching-in of power supply, a transistor (TR) 15 is turned off by outputting an OFF signal to the TR 15 from a control circuit 14. Consequently, reference voltage 7 is set at a high side. The reference voltage 7 and the output 6 of a temperature detection circuit 5 are compared by a voltage comparator 8, and when both coincide with each other, by turning on the TR 15 through the control circuit 14, the reference voltage 7 is dropped so as to return to a usual set value. After that, the temperature is controlled by turning on or off the contact 11 of a relay 9 through a drive circuit 10 according to the output of the voltage comparison circuit 8.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a controller for electric carpets.

2. Description of the Related Art The circuit of a conventional electric carpet controller includes a circuit 1, a switch 2, a DC power supply section 3 for converting alternating current into direct current, and a heater 4, as shown in FIG.

A detection circuit 5 that detects the heater temperature and outputs a DC voltage corresponding to the heater temperature, a voltage comparator 8 that compares the output voltage 6 of the detection circuit with a reference voltage 7, and a relay 9.
, a drive circuit 10 that drives the relay 9 using the signal output from the voltage comparator 8, a relay contact 11 that connects the DC power supply section 3 and the heater 4 through this relay, and a temperature control volume 12. was.

In this circuit configuration, the temperature control volume 12 is connected externally.
When the heater temperature is set, the relay contact 11 is closed and current is supplied to the heater 4 until the set temperature is reached.
When the set temperature was reached, the relay contact 11 was opened to cut off the supply of current to the heater 4 and lower the heater temperature.

When the heater temperature drops to a certain temperature, the relay contact 11 is closed, current is supplied to the heater 4, and the heater temperature is raised again.

Problems to be Solved by the Invention However, since the heater 4 is sandwiched between carpets and the carpet has a large heat capacity, the heater temperature may reach the set temperature before the heat of the heater 4 is sufficiently transferred to the carpet surface. , current is no longer supplied to the heater 4. For this reason, the heater temperature is lowered before the carpet surface temperature reaches the appropriate temperature, and it takes time for the carpet surface temperature to reach the appropriate temperature, causing discomfort when using the carpet.

The present invention was made in view of these problems, and
The purpose is to bring the temperature of the carpet surface to an appropriate temperature in a short time when the power is turned on.

Means for Solving the Problems In order to achieve the above objects, the present invention provides a heater connected to a power source via a switch means, and a sensor that detects the temperature of the heater and outputs an output voltage corresponding to the heater temperature. a voltage comparator that compares the output voltage with a reference voltage and outputs a signal; a drive circuit that receives the signal and controls energization of the heater; and a drive circuit that receives the signal and controls the reference voltage. It has a control circuit.

, Embodiment FIG. 1 is a circuit diagram of a controller for an electric Hayabusa carpet according to an embodiment of the present invention.

Reference numeral 1 is an AC power supply, and when switch 2 is turned on, AC flows into a DC power supply section 3 and is converted to DC.

4 is a heater, and a detection circuit 5 detects the heater temperature of this heater 4 and outputs an output voltage 6 corresponding to this heater temperature. The fixed resistor R+R3e R4 and the variable resistor R2 are connected in series, and the movable terminal of the variable resistor R2 is connected to the non-inverting input terminal of the voltage comparator 8.

Furthermore, the fixed resistor R5 is connected to the non-inverting input terminal and the voltage comparator 8.
is connected between the output terminal of the This variable resistance R2
also serves as a volume 12 for controlling temperature from the outside. The reference voltage 7 input to the non-inverting input terminal of the voltage comparator 8 is determined by the voltage division ratio of R1, R2, R3, and R4.
is determined, the voltage comparator 8 receives and compares the reference voltage 7 and the output voltage 6, and outputs a voltage comparator output 13. The drive circuit 10 controls the drive of the relay 9 by switching the voltage comparator output 13 between H level and L level.

The relay 9 controls ON/OFF of a relay contact 11, and this relay contact 11 connects the DC voltage section 3 and the heater 4. The voltage comparator output 13 is also input to the control circuit 14 . As such, the output terminal of the voltage comparator 8 and the control circuit 14 are connected. Further, the collector and emitter of the transistor 15 are connected to both ends of the fixed resistor R4, and the base and the control circuit 14 are connected to each other. ``When this transistor is turned on, it serves as a bypass for the fixed resistor R4.

Next, the operation of this circuit will be explained.

i) When switch 2 is turned on, alternating current is converted to direct current by direct current power supply section 3. Current flows into the heater 4, and the heater temperature rises. When the power is turned on, the control circuit 14 outputs an off signal to the reference voltage control transistor 15 to turn off the transistor 15. At this time, the reference voltage 7 is determined by the voltage division ratio of the resistance value of R1 and the combined resistance value of R2, R3, and R4, and becomes vl as shown in Figure 3. In this way, the reference voltage during rapid heating is set higher. ing. What is shown by a dotted line in FIG. 3 is the output voltage 6 of the detection circuit 5, and this output voltage 6 increases in proportion to the rise in heater temperature.

■) Is output voltage 6 the reference voltage during rapid heating? (V+), the voltage comparator output 13 of the voltage comparator 8 is inverted and changes from H level to L level. This voltage comparator output 1
3, the drive circuit 10 operates and drives the relay 9, thereby opening the relay contact 11 and turning off the power to the heater 4. Further, when the voltage comparator output 13 becomes L level, the control circuit 14 receives the signal and outputs an on signal to the reference voltage control transistor 15, thereby turning on the transistor 15. By turning on the transistor 15, no current flows through R4, and the reference voltage 7 input to the non-inverting input terminal of the voltage comparator 8 is determined by the voltage division ratio of the resistance value of R+ and the combined resistance value of R2e Rs - R@ and drops to v3 as shown in FIG. By turning off the power to the heater 4, the heater temperature decreases.

ii) Along with this, the output voltage 6 of the detection circuit 5 decreases and when it reaches v3, the voltage comparator output 13 of the voltage comparator 8 is inverted and becomes H level. In response to this inversion of the voltage comparator output 13, the drive circuit 10 operates and drives the relay 9, thereby closing the relay contact 11 and starting energizing the heater again. When the voltage comparator output 13 becomes H level, the reference voltage 7 becomes equal to the resistance value of R+ and R2.
+ is determined by the voltage division ratio of the combined resistance value of R3, and becomes v2 as shown in FIG. By turning on the power to the heater 4, the heater temperature increases.

iv) Along with this, the output voltage 6 of the detection circuit 5 increases and when it reaches the reference voltage 7 (V2), the voltage comparator output 1
3 is reversed and becomes L level, the relay contact 11 is opened again, and the power supply to the heater 4 is turned off. Hereafter this ii),
iv) is repeated, and the temperature of the carpet surface reaches the third level.
It will look like the figure.

With the present invention, instead of setting the rapid heating time by time (
The heater can be controlled to continue energizing the heater until it reaches a certain temperature, eliminating problems such as abnormal temperature rises caused by differences in heater temperature rise rates depending on the usage environment, and making control possible with a simple circuit configuration.

Effects of the Invention According to the present invention, since rapid heating control is performed by continuing to energize the heater until the heater temperature reaches a certain temperature, the surface temperature of the carpet can be sufficiently raised in a short time. Also, there are no problems such as abnormal temperature rise due to the rate of rise in heater temperature depending on the usage environment.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an electric carpet controller according to an embodiment of the present invention, FIG. FIG. 3 is an explanatory diagram showing changes in carpet surface temperature over time, and FIG. 4 is a circuit diagram of a conventional electric carpet controller. 3...DC power supply section, 4...Heater, 5
...Detection circuit, 6...Output voltage, 7.
...Reference voltage, 8...Voltage comparator, 9.
... Relay 10 ... Drive circuit, 11.
... Relay contact, 12 ... Temperature adjustment volume, 13 ... Voltage comparator output, 14 ...
...Control circuit, 15...Transistor. Name of agent: Patent attorney Shigetaka Awano and 1 other person/=-
Il' hot water 2--- switch 3-a it electric rFIkm 4- heat 9 5-- compensation lalo fI m 6- output voltage 7- reference voltage 8-- voltage calibrator 9... -10--・K Tsuruguchi-ji 15--5

Claims (1)

[Claims] A heater connected to a power source via a switch means, a detection circuit that detects the temperature of the heater and outputs an output voltage corresponding to the heater temperature, and a voltage that outputs a signal by comparing the output voltage with a reference voltage. An electric carpet controller comprising a comparator, a drive circuit that receives the signal and controls energization of the heater, and a control circuit that receives the signal and controls the reference voltage.