JPH0367930A - Controller of electric heater - Google Patents

Abstract

PURPOSE:To allow the current of a heater not to flow even if a power source is restored at power failure by connecting one end of a timer circuit to the load side of a contact of a relay. CONSTITUTION:When an operation knob 8 is turned, points 7a-7c, 7b-7d between the terminals and the contacts of a controller 7 are closed respectively. When a start switch 11 is pushed to close its contact, the currents of a heater 6 and a timer circuit 9 are allowed to flow and at the same time the contact of a relay 10 is closed with the use of the signal from the timer circuit 9. Here, when the current of the heater 6 is cut off curing electricity supply by power failure and the like, the operation of the timer circuit 9 stops and the relay 10 is in an open state in hand with it. Even if a power source is restored be cause the relay 10 is in the open state, the current of the timer circuit 9 is not allowed to flow. Accordingly, the current of the heater 6 is not allowed to flow. In order to allow the current of the heater 6 to flow again, the start switch 11 is pushed to operate the timer circuit 9 and the relay 10 again.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a control device for a home electrical appliance equipped with a safety function.

BACKGROUND OF THE INVENTION The electric circuit of a conventional electric stove is shown in Figure 4 (1).
1f configuration was common. Below is its structure/Explanation 2/
\-/ Then, the controller 1, which is rotated by an operation knob (not shown), has switches 1a and 1b, one of which is connected to the power supply. One end of the heater 3 is connected to the other end of the switch 1a through a contact of a relay 4, and the other end of the heater 3 is connected to the other end of the switch 1b. One end of the timer circuit 2 that sends a signal to the relay 4 is connected to the switch 1.
The other end is connected to the load side of the switch 1b, and the other end is connected to the power supply side of the switch 1b. In the above configuration, only one operation (not shown)
When you rotate the switch 1a inside the controller 1.

1b closes, the timer circuit 2 starts operating, and at the same time, the relay 4 operates and its contacts close, thereby energizing the heater 3 and heating the object to be heated. When a predetermined time has elapsed, the timer circuit 2 sends a "cut" signal to the relay 4, the contacts of the relay 4 open, and the power to the heater 3 is stopped. When the heater 3 is energized, one
If the power is cut off due to a power outage or the like while heating the object to be heated, the power supply to the heater 3 will of course stop, but when the power is restored, the switches 1a and 1b3 of the controller 1 will be turned off.
A long time ago when... closed! Therefore, the timer circuit 2. Said relay 4
is reactivated and the heater 3 is energized again.

Problems to be Solved by the Invention As described above, with conventional electric stoves, if you forget to close the electric stove controller during a power outage, when the power is restored, the heater will be energized again, causing damage to the heater. There was a risk of fire or burns due to abnormal heating of heated materials.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a safe control device for an electric stove in which the heater is not energized even if the power is restored after a power outage.

Means for solving the problem A stove body equipped with a heater that heats the object to be heated,
A controller is provided to control the heater in conjunction with an operation knob, one end of the power supply side of the controller is connected to one end of the power supply, the other end is connected to the other end of the power supply via a contact of a relay, and a signal is sent to the relay. A sending timer circuit is connected to the power supply side terminal of the controller, a nut switch is connected in parallel to the contact point of the relay, and the start switch and the knob are provided separately and independently.

Effects of the present invention With the configuration described in section 2, when the power is cut off due to a power outage, the operation of the timer circuit is stopped and at the same time, the contacts of the relay are released. Since one end of the timer circuit is connected to the load side of the contacts of the relay, even if the power is restored, the timer circuit and relay will not operate. The heater is therefore not energized. In order to energize the heater again and heat the object to be heated, the user must press the start switch to reactivate the timer circuit and relay.

EXAMPLES Hereinafter, examples of the present invention will be described with reference to the drawings. 1st. In FIG. 2, the controller 7 connected to the operating knob 8 includes a terminal 7a having a contact piece, a γb1 contact 7C,
Built-in 7d. The terminal 7a is connected to a part 11 of the power source 12, and the power terminal 7b is connected to the power source 12 through a contact of a relay 10.
connected to the other end. One end of the timer circuit 9 is the contact 7c.

The other end is connected to the terminal terminal. Start switch 1
1 is connected in parallel to the contacts of the relay 10. Both paths 1 of the heater 6 are connected to each of the contacts 7c and 7d. The start switch 11 is provided so as not to protrude beyond the operating surface. An indicator lamp 13 indicating the operating state of the heater 6 is connected to the contact point 7c through a resistor R.
, 7d.

In FIG. 3, a heater 6 is mounted on the stove body 5. 13 is a display lamp, and 12 is a display board.

To explain the operation in the above configuration, by fully rotating the operation housing 8, the terminal-contact points 7a-7c of the controller 7 are
, 7b-7d each close. When the start switch 11 is pressed to close its contacts, the heater 6 and the timer circuit 9 are energized, and at the same time, the contacts of the relay 10 are closed by a signal from the timer circuit 9. Even if the start switch 11 is released, the above state is maintained. When a predetermined time period of 11 and 1') has elapsed, the timer circuit 9 sends a signal to the relay 1o to open its contacts and cut off the power to the bitter 6. The heater 6 is connected to the
When the power is cut off due to a power outage or the like during the Bay 7 model, the operation of the timer circuit 9 is stopped and the relay 10 is accordingly opened. Of course, the heater 6 is not energized. Even when the power is restored, the timer circuit 9 is not energized because the relay 10 is in an open state. Therefore, the heater 6 is not energized.

In order to energize the heater 6 again, the start switch 11 must be pressed to restart the timer circuit 9° relay 10.

As described above, according to the present invention, even if a power outage occurs while the electric stove is in use and is restored, the heater will not be automatically reenergized. Additionally, since the start switch is recessed from the operating surface of the electric stove and is located away from the operating knob, the heater will not be energized even if a part of the user's body accidentally touches the operating unit. There is no.

Effects of the Invention As is clear from the above embodiments, it is possible to provide a safe control device for an electric stove in which even if a power failure occurs while the heater is being energized and the power is restored, the heater will not be energized unless the start switch is turned on again.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an electric stove showing an embodiment of the present invention;
FIG. 2 is a plan view of essential parts of the operating section of the stove, FIG. 3 is an overall perspective view of the stove, and FIG. 4 is a circuit diagram of a conventional electric stove. 6...Heater, 7...Controller, 8.
...Operation tl, 9 ...Timer In, 1
0 mountain...relay, 11...start switch.

Claims (1)

[Claims] A stove body on which a heater is placed to heat the object to be heated,
A controller is provided to control the heater in conjunction with an operation knob, one end of the power supply side of the controller is connected to one end of the power supply, the other end is connected to the other end of the power supply via a contact of a relay, and a signal is sent to the relay. A control device for an electric stove, comprising: a timer circuit to be sent connected to a power supply terminal of the controller, a start switch connected in parallel to a contact point of the relay, and the start switch and the knob provided separately and independently.