JPH0718592B2 - Electric kotatsu - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to an electric kotatsu.

(Prior Art) FIG. 4 is a configuration diagram of an electric kotatsu viewed from the side.
The figure is an external view of the kotatsu viewed from below. The yagura kotatsu body 1 is composed of a plate 2 and four legs 3, and an inner joint 4 is passed to the plate 2. The inner cover 4 is provided with a heater cover 5, a heater 6 is arranged inside the heater cover 5, and a stirring fan motor 7 and a stirring fan 8 are provided. Further, the yagura kotatsu body 1 is provided with a tool plug 9 having a built-in thermistor for detecting the temperature inside the kotatsu, and a temperature controller 11 is connected to the tool plug 9 via a cord 10. Inside the temperature controller 11, a temperature adjusting dial including a variable resistor for setting the temperature inside the kotatsu to a desired temperature is provided, and a triac for adjusting the amount of power supplied to the heater 6 is provided. The temperature controller 11 is also provided with a power plug 13 via a cord 12.

When using such an electric kotatsu, connect the instrument plug 9 to the yagura kotatsu body 1 and connect the power plug.
Connect 13 to a power outlet. When the power switch of the temperature controller 11 is turned on in this state, the temperature controller 11 controls the conduction angle of the triac according to the temperature difference between the temperature set by the temperature adjustment dial and the temperature inside the kotatsu detected by the thermistor, and the heater is controlled. 6 adjusts the amount of electric power supplied to 6 and drives the stirring fan motor 7. As a result, the temperature inside the kotatsu is maintained at the desired temperature.

By the way, the installation location of the power outlet in the room is fixed, and when using an electric kotatsu, the power plug 13 is connected to this power outlet, so the position of the temperature controller 11 is determined by the installation position of the power outlet. . However, the user of the electric kotatsu sits on the side where the temperature controller 11 is placed and enters the electric kotatsu,
Alternatively, sit on the side opposite to the side on which the temperature controller 11 is placed and enter the electric kotatsu. If the user sits on the side where the temperature controller 11 is placed among such sitting positions, the user has good operability with respect to the temperature controller 11, but the user does not see the side where the temperature controller 11 is placed. When sitting on the opposite side, in order to operate the temperature controller 11, it is necessary to stand once and go to the position where the temperature controller 11 is placed. Then, after the operation, the user has to return to the original position again. Therefore, an extension cord is connected to the power plug 13 in order to eliminate the movement of the user when operating the temperature controller 11 as described above. However, if the extension cord is connected, the extension cord becomes an obstacle, or It may look unsightly.

(Problems to be Solved by the Invention) As described above, the position where the temperature controller 11 is placed is determined, and the operability for the temperature controller is poor.

Therefore, it is an object of the present invention to provide an electric kotatsu that can be placed at a desired position on the temperature controller and can be improved in operability.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a main body of a yagura kotatsu, a temperature sensor provided in the main body of a yagura kotatsu, a temperature inside the kotatsu detected by the temperature sensor, a set temperature, and the like. A power supply circuit that controls the temperature inside the kotatsu to a set temperature by digitally calculating the amount of power supplied to the heater and at least an operation switch for setting the set temperature is housed and one end is connected to this operation switch. A temperature controller provided with a lead wire; and a first connection end provided at least at two positions in the body of the yagura kotatsu and electrically connected to the power supply circuit, and a second connection end connected to the other end of the lead wire. The first and second connecting ends are configured to be electrically connectable to and disconnectable from each other and mechanically attachable / detachable to and from the first and second connecting ends. An electric kotatsu to be achieved the above object detachment detection circuit for detecting an electrical connection and disconnection are provided.

(Operation) By providing such means, the temperature controller accommodating at least the operation switch for setting the set temperature has the second connection end provided on the lead wire and the first connection provided on the main body of the yagura kotatsu. Make electrical and mechanical connections to the ends. In this case, since the first connection end is provided at at least two places of the yagura kotatsu body, the second connection end is connected to the first connection end where the position where the temperature controller is placed is the desired position. Also, when connecting the first and second connection ends,
The attachment / detachment detection circuit detects the electrical connection between the connection ends, and reliably connects the first and second connection ends. Further, the power supply to the heater and the stirring motor is started only when the temperature controller is connected to the first or second connection end or both the first and second connection ends and the power switch of the temperature controller is pressed. However, when the temperature controller is not connected to any of them, the heater and the stirring motor are not energized at any time.

(Example) Hereinafter, one example of the present invention will be described with reference to the drawings. The same parts as those in FIGS. 4 and 5 are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 1 is a configuration diagram of an electric kotatsu viewed from below.
The figure is a block diagram of an electric circuit of the electric kotatsu. The yagura kotatsu body 1 is provided with a power receiving device connector 20, and a device connector 22 connected to a power cord 21 is attached to the power receiving device connector 20. An intermediate switch 23 and a power plug 24 are connected to the power cord 21. The power receiving device connector 20 is divided into two systems, one of which is directly connected to the control board 25 and the other of which is connected to the control board 25 through a power transformer 26. On the control board 25, each circuit constituting the power supply circuit, that is, the rectifier circuit 27 and the smoothing circuit 2
8. A temperature detection circuit 29 having an A / D (analog / digital) conversion function is formed, and an IC chip such as a microcomputer 30 and a triac 31 are provided. Further, the yagura kotatsu body 1 is provided with a thermistor 32 for detecting the temperature inside the kotatsu, and this thermistor 32 is connected to the microcomputer 30 on the control board 25 through the temperature detection circuit 29.

The configuration of the electric circuit will be described with reference to FIG. 2. The line directly connected from the power receiving device connector 20 to the control board 25 is connected to the heater 6 through the triac 31 and the stirring fan motor 7 through the driving triac 52. It is connected to the. Further, the line connected from the power receiving device connector 20 to the control board 25 via the power transformer 26 passes through a rectifying circuit 27 and a smoothing circuit 28 to a microcomputer 30.
It is connected to the. A thermistor 32 is connected to the microcomputer 30 via the temperature detection circuit 29 and a triac 31 via a triac drive circuit 33.
And the gate of the triac 52 are connected.

Signal connectors 34 and 35 as first connecting ends are provided on the inner casings 2 of the yagura kotatsu body 1 at positions facing each other. The signal connectors 34 and 35 are provided at positions where the controller couplers 44 of the inner casings 2 are easily connected by the connector cases 36 and 37, respectively.
The signal connectors 34 and 35 are connected to the microcomputer 30 on the control board 25 via the board-side signal connectors 38.39, respectively.

On the other hand, 40 is a temperature controller, and this temperature controller 40 has an operation switch 41 for setting a desired kotatsu temperature, and a light emitting element (LED) for displaying the set temperature set by the operation switch 41. 42 and a power switch 53 in the controller are provided. The operation switch 41 is provided with two for increasing the temperature and for decreasing the temperature. Further, the temperature controller 40 includes an operation switch 41 and a light emitting element 42.
Also, a lead wire 43 electrically connected to the power switch 53 in the controller is provided. The other end of the lead wire 43 is provided with a controller coupler 44 as a second connecting end.

The signal connectors 34, 35 and the controller coupler 44 are configured to be electrically connectable to and disconnectable from each other and mechanically attachable / detachable.
The controller coupler 44 is provided with an attachment / detachment detection circuit for detecting electrical connection and disconnection. A specific configuration of the signal connector 34 and the control coupler 44 shown in FIG. 3 will be described. The signal connector 34 has a connector body 45 made of an electrically insulating material and connection sockets 46a, 46b, 46c, ... A recess 47 is formed at the end of the connector body 45. On the other hand, the controller coupler 44 is connected to a connector body 48 made of an electrically insulating material at predetermined intervals, and each connection plug 49a, 49b, 49c ...
Are arranged. And the signal connector 34
And the controller coupler 44 are connected to each connection plug
49a, 49b, 49c ... Are inserted into the respective connection sockets 46a, 46b, 46c. A claw portion 50 that engages with the recess 47 is formed at the end of the connector body 48. here,
The connection plugs 49c and 49d are connected by a detachment detection cord 51 as an attachment / detachment detection circuit.

The microcomputer 30 performs a digital calculation process from the set temperature set by the operation switch 41, the temperature inside the kotatsu detected by the thermistor 32 and the temperature stored in the built-in ROM to obtain the conduction angle of the triac 31, It has a function of sending a control signal of the conduction angle to the triac control circuit 33. Further, the microcomputer 30 sends a high-level signal to the connection socket 46c or 46d, detects the signal returned from the connection socket 46d or 46c, and confirms that the signal connector 34 and the controller coupler 44 are completely connected. It has a function of checking and a function of stopping energization of the heater 6 and the stirring fan motor 7 when the controller coupler 44 is not connected to both signal connectors 34 and 35. Furthermore, when the temperature controller 40 is connected to both signal connectors 34 and 35, the microcomputer 30 preferentially reads the set temperature of the side on which the operation switch 41 is operated among the temperature controllers 40, and the temperature inside the kotatsu It has a function to control.

Next, the operation of the electric kotatsu configured as described above will be described. When the controller coupler 44 is connected to the signal connector 34, the power plug 24 is connected to a power outlet and the intermediate switch 23 is turned on, the power voltage is transformed by the power transformer 26 and sent to the rectifier circuit 27. It is rectified, smoothed by the smoothing circuit 28, and supplied to the microcomputer 30. For example, the microcomputer 30 sends a high level signal to the connection socket 46c and detects the signal returned from the connection socket 46d to confirm that the signal connector 34 and the controller coupler 44 are completely connected. At this time, if no signal is returned to the connection socket 46d, the microcomputer 30 stops energizing the heater 6 and the stirring fan motor 7.

When it is confirmed that the signal connector 34 and the controller coupler 44 are completely connected, the power switch 53 in the temperature controller 40 receives the ON signal, and when this signal is turned ON, the microcomputer 30 is set by the operation switch 41. The conduction angle of the triac 31 is obtained by executing digital arithmetic processing from the set temperature, the temperature inside the kotatsu detected by the thermistor 32, and the temperature stored in the built-in ROM,
The control signal of this conduction angle is sent to the triac control circuit 33. This energizes the heater 6 and disconnects the drive triac from the stirring fan motor 7.
The control signal 52 is sent, and the stirring fan motor 7 is driven to rotate the stirring fan 8 accordingly. As a result, the temperature inside the kotatsu rises and reaches the set temperature, after which the set temperature is kept constant.

By the way, when operating the operating switch 41 to change the set temperature, the operating switch 41 for raising or lowering the temperature is pushed according to the set temperature. For example, when the set temperature "low" is changed to the set temperature "high", the operation switch 41 for raising is pushed seven times, for example. At this time, the microcomputer 30 detects the number of operations of the operation switch 41 for raising and lowering the temperature, reads the change in the set temperature with a digital signal, and sends a drive current to the light emitting element 42 in the temperature controller 40. The light is emitted to display the temperature level set by the user. When the temperature controller 40 is connected to both signal connectors 34 and 35, respectively, the microcomputer 30
Controls the temperature inside the kotatsu by preferentially reading the set temperature on the side where the operation switch 41 is operated among the temperature controllers 40.

As described above, in the above-described embodiment, the temperature controller 40 accommodating the operation switch 41 is connected to the two signal connectors 34 and 35 provided in the yagura kotatsu body 1, and at this time, the signal connectors 34 and 35 and the controller coupler 44 are connected. The temperature controller is configured to detect the electrical connection with
The operability of the temperature controller 40 can be improved because the 40 can be placed at a position according to the usage condition of the user. in this case,
The operability is further improved by connecting two temperature controllers 40. In addition, the signal connectors 34 and 35 and the controller coupler 44
It is possible to confirm the electrical and mechanical connection state with and improve the safety.

The present invention is not limited to the above-described embodiment, and may be modified without departing from the spirit of the invention. For example, the signal connectors are not limited to two locations and may be provided in a plurality of locations. In this case, temperature controllers may be connected to all the signal connectors. Further, the signal connectors 34, 34 and the controller coupler 44 are configured such that they can be electrically connected to and disconnected from each other and mechanically detachable, and an attachment / detachment detection circuit for detecting electrical connection / disconnection is provided. Anything is acceptable.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to provide an electric kotatsu which can be placed at a desired position for the temperature controller and which can improve operability.

[Brief description of drawings]

1 to 3 are views for explaining one embodiment of an electric kotatsu according to the present invention. FIG. 1 is a configuration diagram viewed from the bottom of a yagura kotatsu body, and FIG. 2 is an electric circuit. FIG. 3 is a configuration diagram of a signal connector and a controller coupler, and FIGS. 4 and 5 are configuration diagrams of a conventional electric kotatsu. 1 ... Yarakotatsu body, 3 ... legs, 6 ... heater, 7
…… Agitation fan motor, 8 …… Agitation fan, 20 …… Power receiving device connector, 21 …… Power cord, 22 …… Device plug, 23 …… Intermediate switch, 24 …… Power plug, 25 …… Control board , 26 …… power transformer, 27 …… rectifier circuit, 28 ……
Smoothing circuit, 29 ... Temperature detection circuit, 30 ... Microcomputer, 31 ... Triac, 32 ... Thermistor, 33 ...
… Triac drive circuit, 34,35 …… Signal connector, 36,
37 …… Connector case, 38,39 …… Board side signal connector, 40 …… Temperature controller, 41 …… Operation switch, 42
...... Light emitting element, 43 ...... Lead wire, 44 …… Controller coupler.

Claims (1)

[Claims] 1. A yagura kotatsu body, a temperature sensor provided on the yagura kotatsu body, a kotatsu inner temperature and a set temperature detected by the temperature sensor are digitally processed to obtain a power supply amount to a heater. A power supply circuit for controlling the temperature inside the kotatsu to the set temperature; and a temperature controller that accommodates at least an operation switch for setting the set temperature and that has a lead wire whose one end is connected to the operation switch, The first and the second connecting ends are provided at least at two positions in the body of the yagura kotatsu and are electrically connected to the power supply circuit, and a second connecting end connected to the other end of the lead wire. The two connection ends are configured to be electrically connectable to and disconnectable from each other and mechanically attachable / detachable, and to electrically connect and disconnect the first and second connection ends. Electrical wherein the detachment detection circuit for detecting the disconnection is provided kotatsu.