JPS6343284A - Electric carpet - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to an electric carpet used as a heating appliance.

[Conventional technology]

Conventionally, the temperature of an electric carpet has been controlled by turning on and off a relay contact inserted into the bus bar of the heater load, thereby controlling the current supplied to the heater load. In addition, in order to switch between, for example, two heater loads, a full setting state in which both are energized, and a single setting state in which one selected one is energized, a switch is inserted in series with each heater load, and the switch is turned on. Block switching was performed. However, since the relay contacts repeatedly turn on and off each time there is a temperature change, contact deterioration over time tends to cause the contacts to explode, which is called locking. For this reason, a relay with a large contact recovery force is used to prevent this explosion from occurring. Additionally, since the heater load current flows through the switch that changes between full settings and single settings, a switch rated to withstand that current was used.

[Problem that the invention seeks to solve]

However, such conventional devices required the use of large relays and large switches in order to operate the contacts against a large restoring force. There was a limit to how thin the product could be.

[Means for solving problems]

In order to solve these problems, the present invention uses relay contacts to independently control on/off of each heater load, and switching between full setting and single setting is done by selecting the solenoid of the relay. be.

[Effect]

The current flowing through the relay contacts becomes a small value, and the setting state can be changed by switching a circuit with a small current.

〔Example〕 FIG. 1 is a block diagram showing one embodiment of the present invention.

In the figure, 1 and 2 are heater loads, 3 is a temperature detection circuit that detects the temperature of the heater load and generates a temperature signal corresponding to that temperature, and 4 is a circuit for the user to set the electric carpet to the desired temperature. a temperature setting circuit having a dial and sending out a setting signal to indicate the temperature set there;
5 is a temperature control circuit that generates a control signal for controlling the temperature of the heater load; 6.7 is a solenoid of a relay energized by the control signal sent from the temperature control circuit 5;
8 and 9 are relay contacts, and 10 and 11 are switches for switching heater blocks.

The operation of the device configured as described above is as follows.

When the user adjusts the dial of the temperature setting circuit 4 and performs an operation to set the carpet to a desired temperature, the temperature control circuit 5 receives a setting signal sent from the temperature setting circuit 4 and a setting signal sent from the temperature detection circuit 3. A control signal is generated by comparing the transmitted temperature signal and making the values of both signals the same.

This control signal is a signal that turns on and off relays 6.7, and when the relays are turned on, current is supplied to the heater load and the temperature rises. When the temperature signal sent from the temperature detection circuit 3 becomes equal to or exceeds the set signal sent from the temperature setting circuit 4, the temperature control circuit 5 deenergizes the relay and the electric carpet is turned off. Equilibrium is reached and the desired temperature is reached.

At this time, since the relay contacts are inserted into each heater load independently, each contact only needs to turn on and off the current of one heater load, and its rating can be set to a small value. Therefore, the entire relay can be made compact. Furthermore, by switching the switch 10° 1, the heater load block to be used can be selected, and two types of block switching can be performed: single setting and full setting. The switching at this time is by switching the solenoid of the relay, and this is a very small current circuit, so the switches 10 and 11 need only have small current ratings.
Therefore, a small switch can be used, which contributes to making the whole device thinner.

FIG. 2 is a block diagram showing another embodiment.

In the figure, 21 is a temperature setting switch, 22 is a heat generating block changeover switch, and 23 is a control unit using a microcomputer. The control section 23 includes a temperature setting section 230, a block switching section 231, an A/D conversion section 232, and a comparison section 23.
3. It is composed of a block-specific output signal generation section 234, and the temperature setting section 230 and block switching section 231 are configured to set the temperature and switch the heat generation block according to the number of operations of the temperature setting switch 21 and the heat generation block changeover switch 22. There is. As will be described later, the temperature setting section 230 receives a signal from the block switching section 231 to correct the temperature so that the temperature set by the temperature setting switch 21 does not change between the single stage constant state and the full setting state. Includes temperature compensation function.

In the device configured as described above, the temperature is set by the number of times the temperature setting switch 21 is operated, and the heat generating block is selected depending on the number of times the heat generating block changeover switch 22 is operated. Then, the relay is controlled on and off in accordance with the signal supplied from the temperature detection circuit 3, and the temperature of the heater load increases. When the temperature signal sent from the temperature detection circuit 3 matches the setting signal generated from the temperature setting section 230, the relay is deenergized and the current supplied to the heater load is cut off. Finally, the temperature of the electric carpet will equilibrate to the desired temperature.

Here, there is no problem in the case of full setting in which both heater loads 1 and 2 are used, but in the case of single setting in which only one heater load is used, the following problem occurs. Temperature detection circuit 3
operates based on a signal supplied from a sensor (not shown) provided near the heater load. However, in the case where only one sensor is used, the impedance of the sensor is different between full setting and one setting. For this reason, even if the impedance is corrected to be equal between full settings and single settings at a certain temperature, an error will occur if the temperature differs from that temperature, and The electric carpet does not reach the same temperature over time, and the user feels uncomfortable. Therefore, in this device, the temperature setting section 230 in the microcomputer is provided with a correction function, and the impedance error of the sensor is corrected by the signal representing the single setting and the full setting supplied from the block switching section 231. ing.

That is, the sensor impedance changes as shown in FIG. 3 between the full setting and the single setting, but
Correct this difference so that it is the same in both conditions. By doing this, the temperature of the electric carpet is maintained at the temperature set by the temperature setting switch 21 regardless of whether the electric carpet is set to the full setting or to the single setting, and a comfortable feeling of use can be obtained.

FIG. 4 is a flowchart showing the operation of the apparatus shown in FIG. In the same figure, step 100 is a mode for switching the heat generation block, and step 101 is a determination as to whether or not all settings are set. If it is determined that rYEsJ, that is, the temperature of the heater load, is lower, both relays 6 and 7 are turned on as shown in step 103, but it is determined that rNOJ is greater. As shown in step 103, both relays 6.7 are turned off. Step 10
If it is determined in step 1 that rNOJ is not the full setting, it is determined in step 105 whether the setting signal is larger than the temperature signal, and it is determined that r Y E S j, that is, the temperature of the heater load is lower. When it is determined, as shown in step 106, it is determined whether A or B, that is, whether relay 6 is to be energized or relay 7 is to be energized. The relay selected here is the one set by the heat generating block changeover switch 22. Depending on the selection in step 106, either relay 6.7 is turned on as shown in step 107 or step 108. When the temperature rises and the determination in step 105 is "NO", the relay that was on is turned off as shown in step 109.

〔Effect of the invention〕

As explained above, in this invention, a plurality of heater loads are independently turned on and off by relays, and the relay to be energized is switched between the full setting state and the single stage steady state.
The relay contact and the switch for changing the setting state can be small in size, and the entire device can be made thin.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing one embodiment of the present invention. Fig. 2 is a block diagram showing another embodiment. Fig. 3 is a graph showing the characteristics of the sensor. Fig. 4 shows the operation of the device shown in Fig. 2. FIG. 1.2... Heater load, 3... Temperature detection circuit,
4...Temperature setting circuit, 5...Temperature control circuit, 6
．． 7...Relay, 8.9...Relay contact, 1
0.11...Switch. Patent applicant: Nippon Dentsu Co., Ltd. Agent: Masaki Yamakawa (and 2 others) Figure 3 Figure 4

Claims (2)

[Claims] (1) A plurality of heater loads, a power control element provided in series with each heater load to turn on/off the current supplied to the heater loads, a block switching circuit for selecting the power control element, and a user a temperature setting circuit that generates a setting signal in response to the set temperature; a temperature detection circuit that detects the temperature of the heater load; and a temperature detection circuit that detects the temperature of the heater load; An electric carpet consisting of a temperature control circuit that controls the temperature to a set temperature using a temperature setting circuit. (2) The temperature control circuit performs temperature correction so that the heater load temperature becomes the temperature set by the temperature setting circuit no matter which heater load block is selected. Electric carpet as described in section.