JPH06337121A - Electric radiant heater - Google Patents

Abstract

PURPOSE:To provide an electric radiant heater which judges whether it is upset or moved and which does not stop power supply without deciding movement as the upset of the same, thus making said heater convenient for use. CONSTITUTION:An electric radiant heater comprises a heater 1, a power supply switch 3 for deciding the supply and stopping of an electric current flowing to the heater 1, a control means 4a for controlling ON/OFF operation of power supply to the heater 1 in response to an ON/OFF signal from the power supply switch, a means 5 for detecting the upset of the electric radiant heater, a timer means 7 for counting an output from the upset detecting means 5 for a specific period of time and an upset decision means 8 for deciding that the electric radiant heater has upset in the case where a termination signal is released out of the timer means 7. The control means 4a receives an upset decision signal from the upset decision means 8 and turns OFF the heater 1 irrespective of the ON state of the power supply switch 3. Accordingly, it is not decided that the electric radiant heater has upset unless an upset signal is continuously inputted during a period from the starting of detection of the upset state until termination of the counting by the timer means 7. Therefore, even in the case where a user moves the electric radiant heater in a room, this movement is not erroneously decided as the upset of the same.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric stove having a fall detection function and improved safety.

[0002]

2. Description of the Related Art A conventional electric stove will be described with reference to FIGS. FIG. 5 is a block diagram of a conventional electric stove,
FIG. 6 is an external view of the electric stove. FIG. 7A is a cross-sectional view of the electric stove, and FIG. 7B is a cross-sectional view showing the electric stove in a falling state. 1 is a heater built in the electric stove main body 2, 3 is an on / off state of electricity to the heater.
An energizing switch 4 for turning off is a control means for controlling energization to the heater. Reference numeral 5 is a fall detection means for detecting a fall state when the main body 2 falls and shutting off energization to the heater 1. The contact 6 is closed during normal operation and the contact 6 is opened during fall.

The operation of the conventional example thus configured will be described. In normal use, the electric stove is installed as shown in FIG. 7A, and the contact of the fall detection means 5 is closed.
Since the energizing switch 3 is turned on and the contact 6 of the fall detection means 5 is closed, the control means 4 turns on the heater 1.
When the main body 2 falls due to an earthquake or the like, the contact 6 of the fall detection means 5 opens as shown in FIG. 7B, and the control means 4 cuts off the power supply to the heater 1 to prevent the occurrence of fire.

[0004]

However, not only when the electric stove body 2 falls, but also when the electric stove body 2 is slightly tilted or moved, the fall detection means 5 operates, so that, for example, without falling. However, even when the user moves in the room with the power still energized, the fall detection means 5 operates only by tilting the electric stove main body 2, and the power supply to the heater 1 is instantaneously stopped. There is

When the energizing switch 3 is turned on,
Fall detection means 5 without the electric stove body 2 falling
When the contact 6 is closed, the heater 1 is energized, and when the fall detection means 5 is opened, the heater 1 is cut off. For this reason, even if the fall detection means 5 operates once and the fall detection means 5 operates and the energization of the heater 1 is cut off, when the contact 6 is closed by the fall detection means 5 and the contact 6 is closed, the fall detection means 5 does not fall down. Since it is indistinguishable from the state, there is a risk that the heater 1 will be energized again in that state, leading to a fire.

Further, since the power failure is not detected, the contact 6 of the fall detection means 5 is closed and the energizing switch 3
If is on, it is judged to be normal and the heater 1 is turned on. For this reason, even if the power supply is temporarily stopped due to the falling state,
After that, there is a power failure, and when the fall detection means 5 hits an object and the contact 6 is closed, it is indistinguishable from a normal state in which the contact point 6 does not fall. There is a problem.

A first object of the present invention is to solve the above problems and to provide a convenient electric stove that does not erroneously detect movement in a room as a fall.

A second object of the present invention is to enhance safety by stopping energization until the user corrects the fall at the time of a fall.

A third object of the present invention is to improve safety by stopping energization until the user corrects the fall even if a power failure occurs after the fall is detected.

[0010]

In order to achieve the above object, an electric stove according to the present invention comprises a heater, an energizing switch for deciding energization stop of the heater, and a heater of the heater according to an ON / OFF signal of the energizing switch. Control means for controlling on / off of energization, fall detection means for detecting fall,
The fall determination means includes a timer means for measuring the output from the fall determination means for a predetermined time, and a fall determination means for determining a fall when there is a time-up signal from the timer means, and a fall confirmation signal from the fall determination means. In response to this, the control means is configured to turn off the heater regardless of the state of the energizing switch.

Further, in order to achieve the second object, when the fall confirmation signal is inputted from the fall determining means, the fall holding means is provided for holding the fall state and canceling the holding of the fall state by turning off the energizing switch. The control means turns off the heater in response to the falling state holding output signal of the holding means.

Further, in order to achieve the third object, a power failure detecting means for detecting a power failure is provided, and when the power failure detecting means determines that the power is restored, if the energizing switch is in the on state, the control means is The heater is kept off until the energizing switch is once turned off.

[0013]

With the above structure, the fall detection output from the fall detection means is timed by the timer means, and if the fall is continuously detected for a predetermined time, the fall determination means determines the fall.

Further, the falling confirmation signal from the falling judgment means is held by the falling holding means, and once the falling is fixed, the holding of the falling state is released only by turning off the energizing switch.

Further, when the power failure detecting means determines that the power failure is restored, even if the power switch is turned on, the heater is kept turned off until the power switch is turned off once.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a block diagram of a first embodiment of an electric stove according to the present invention. 3 is for turning on the power to the heater
An energizing switch 4a for turning off the heater is a control means for controlling energization to the heater, and 5 is a fall detecting means for detecting a fall state when the main body 2 falls.

The characteristic construction of the present embodiment is that the fall detection output of the fall detection means 5 is timed by the timer means 7 and the fall determination means 8 determines fall by the time-up signal of the timer means. is there. The operation of the fall determination at this time is shown in FIG.
The flowchart will be described. In step 1, the fall detection means 5 detects a fall, and if it does not fall, the timer means 7 is cleared. If it is a fall, the timer means 7 measures the time in step 2. When the timer means 7 has timed up, the fall determination means 8 determines that the vehicle has fallen in step 3.
If the timer means 7 has not timed up yet, the current fall / non-fall state is maintained in step 4, and step 1
Return to and continue fall detection.

The fall detection in step 1 includes not only the fall but also the movement in the room. This is the fall detection means 5
This is because it is not possible to distinguish between falling and moving just by moving. Here, the timer value of the timer means 7 is set to 1
Set to about 0 seconds. This time should not be set too long because the heater 1 will not be energized even if it falls. In the movement in the room, even if the fall detection unit 5 detects the fall for a moment, when the movement is over, the normal state is restored again. Therefore, during the time when the timer means 7 is counting, the energization of the heater 1 is not immediately cut off by a fall signal due to movement or the like. Even when notification is given by light or sound when a fall is detected, they do not malfunction due to simple movement in the room.

Further, a second embodiment will be described with reference to FIG. FIG. 2 is a block diagram of a second embodiment of the electric stove according to the present invention. The fall detection output of the fall detection means 5 is timed by the timer means 7, and the fall determination means 8 determines fall by the time-up signal of the timer means 7, but the output is held by the fall holding means 9. The tipping and holding means 9 is released by turning off the energizing switch 3. That is, once it is determined to fall, the fall state is input to the control means 4b even if it is subsequently determined not to fall, and the user intentionally turns the energizing switch 3 from on to off and then on again. Until then, the heater 1 remains off. As a result, some object hits the electric stove that has fallen once, and even if the fall detection means 5 returns to the non-falling state, the heater 1
Is never energized.

Further, a third embodiment will be described with reference to FIG. FIG. 3 is a block diagram of a third embodiment of the electric stove according to the present invention. In recent years, these circuits are often configured using a microcomputer (hereinafter abbreviated as a microcomputer). For example, also in the second embodiment, the timer means 7, the fall determination means 8, the fall holding means 9, the control means 4 are provided.
b can be composed of one microcomputer. However, in the case of a microcomputer, the operation in case of power failure becomes a problem. In other words, if a power failure occurs that exceeds the power backup time, the microcomputer will be initialized. If a power failure occurs after the heater 1 is turned off and the heater 1 is turned off, and the microcomputer is initialized, the microcomputer will start from the non-power failure state when returning from the power failure, and the heater 1
Will be energized. At this time, if the fall detection means 5 detects the fall state, the heater 1 is energized in the time until the fall determination, but if the fall detection means 5 is hit by an object, it is in a non-fall state. There is a risk of fire due to the fact that the electric stove body 2 will be energized even after the electric stove body 2 has fallen over when the power is restored. In the third embodiment, the power failure detection means 10 for detecting a power failure causes the control means 4c to turn off the heater 1 when returning from the power failure. This continues until the user turns the energizing switch 3 from on to off and back on. As a result, even if an object hits the electric stove main body 2 that has fallen during the power failure and the fall detection means 5 returns to the non-falling state, the heater 1 is not energized in the fall state when the power is restored.

[0021]

As is apparent from the embodiments described above, the electric stove of the present invention has the following effects.

(1) Since the fall is not judged unless the fall is continuously detected for a predetermined time set by the timer means, the user holds the electric power switch of the electric stove in the room and moves a little. In such a case, if it is within the predetermined time set by the timer means, it is not determined to fall, the heater is not turned off by mistake, and there is no notification of a fall abnormality.

(2) When the fall confirmation signal is input from the fall determining means, the fall holding means holds the fall state, and the release can be released only by intentionally turning off the energizing switch of the user. Even if the fall detection unit considers that the fall has been released due to some vibration or the like after falling, the heater does not malfunction and the heater is not energized.

(3) If the energizing switch is in the ON state at the time of recovery from the power failure by providing the power failure detecting means, the energizing switch is turned off once and the heater is not energized unless it is turned on. Therefore, even if the electric stove falls, Even if the microcomputer is initialized after a power failure, it is safe because the heater is not energized when the power is restored.

As described above, according to the electric stove of the present invention, it is possible to determine whether to fall or move, and to turn off the heater regardless of the state of the energizing switch when the fall is once confirmed or when recovering from a power failure, It is very safe because the user can release it only by intentionally operating the power switch. Timer means, fall determination means, fall holding means,
If the control means is configured using a microcomputer,
It is possible to provide a safe electric stove inexpensively without increasing the number of circuit components.

[Brief description of drawings]

FIG. 1 is a block diagram of an electric stove according to a first embodiment of the present invention.

FIG. 2 is a block diagram of an electric stove according to the second embodiment.

FIG. 3 is a block diagram of an electric stove according to the third embodiment.

FIG. 4 is a flowchart of fall determination in the first embodiment.

FIG. 5 is a block diagram of a conventional electric stove.

FIG. 6 is an external view showing an example of the conventional electric stove.

FIG. 7 (a) is a cross-sectional view of the conventional electric stove. (B) is a cross-sectional view of the conventional electric stove in a fall.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 heater 3 energizing switch 4a, 4b, 4c control means 5 fall detection means 7 timer means 8 fall determination means 9 fall holding means 10 power failure detection means

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Seiji Oshio 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (3)

[Claims] 1. A heater, an energizing switch for deciding whether to energize or stop the heater, a control means for controlling on / off of energizing the heater according to an on / off signal of the energizing switch, and a fall detection. The fall determining means includes: fall detecting means; timer means for measuring the output from the fall detecting means for a predetermined time; and fall determining means for determining fall when there is a time-up signal from the timer means. An electric stove configured to receive the fall confirmation signal from the controller and turn off the heater regardless of the state of the energizing switch. 2. A fall state holding output signal of the fall holding means, comprising a fall holding means for holding the fall state when the fall decision signal is inputted from the fall judging means and canceling the holding of the fall state by turning off the energizing switch. The electric stove according to claim 1, wherein the control means turns off the heater. 3. A power failure detection means for detecting a power failure is provided, and when the power failure detection means determines that the power failure is restored, if the power switch is on, the control means until the power switch is once turned off. The electric stove according to claim 1 or 2, wherein the heater is kept off.