JP2017133719A - Gas cooking stove - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas cooking stove that uses a direct current obtained from a commercial power supply for electric power for a control circuit when power outage is not occurring, and uses a battery as backup power source during power outage, in which when power is restored from outage, the battery is not charged by the direct current obtained from the commercial power supply so that battery replacement frequency is low.SOLUTION: (a) A gas cooking stove includes a backflow prevention part 35 for blocking the flow of a current from a backup power source 34 to a direct current power source 31 so that output of the direct current power source is connected to the input of the backflow prevention part, and direct current power is supplied to a control circuit 32 from the output of the backflow prevention part, (b) the gas cooking stove includes a switching element 50 between the output of the backup power source and the output of the backflow prevention part for switching a state between a conduction state and a release state by a drive part 51, and (c) the drive part causes the switching element to be in a conduction state when an output voltage of the direct current power source is less than a predetermined conduction voltage, and causes the switching element to be in a release state when the output voltage of the direct current power source is a predetermined release voltage or more.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a gas stove, and more specifically, includes a control circuit for a control burner that uses a DC power source obtained from a commercial power source as a power source, and a backup power source that supplies power from the dry battery to the control circuit when the commercial power source fails. Regarding gas stove.

In recent years, gas cookers have been required to have safety in use, good operability, automatic cooking functions, etc., and gas stoves equipped with a control circuit to enable these are widely provided Has been done.
A gas stove using a dry battery is known as a control circuit for a gas cooker and a drive power source for automatic cooking equipment.

  As this type of gas stove, as disclosed in, for example, Patent Document 1, two single dry batteries connected in series and used as a power source are widely used.

  When two single batteries are connected in series and used as a power source, the output voltage is a guide for battery replacement when the batteries are exhausted due to the use of equipment, that is, two exhausted single batteries are connected in series. The output voltage (end voltage) at is desirably about 2.1V. This is because integrated circuits (control circuits) that can be used at a power supply voltage of about 2V are widely used.

  By the way, when a dry cell is used as a power source of a control circuit of a gas stove, it becomes possible to reduce the frequency of battery replacement by suppressing the power consumption of the control circuit, but in general, the battery is about once a year. Replacement is necessary.

  On the other hand, it is sufficient to use a commercial power supply of AC 100V in order to eliminate the need for battery replacement. However, in this case, there is a problem that the control circuit cannot be used at the time of a power failure and the gas stove cannot be used.

  Here, as shown in FIG. 5, in a state where no power failure occurs, for example, a direct current of 3V voltage from the direct current power supply (DC power supply circuit) 103 using AC100V of the commercial power supply 101 is used as the power supply of the control circuit 102. It can be considered that the battery 104 is used as a power source (backup power source) at the time of power failure.

  When configured in this way, the control circuit 102 is driven by a direct current from a direct current power supply (DC power supply circuit) 103 obtained from the AC 100 V of the commercial power supply 101 during a normal time when no power failure occurs. The dry battery 104 is used as a backup power supply in place of the commercial power supply 101.

  In Japan, the frequency of power outages is low, and the dry battery 104 is used less frequently as a backup power supply in place of the direct current obtained from AC 100V. Therefore, in the above configuration, the consumption of the dry battery 104 used as the backup power supply can be kept low.

  As a result, the frequency of replacement of the battery can be kept extremely low compared with the case where only the dry battery is used as the power source of the control circuit without using the direct current obtained from AC100V as the power source of the control circuit. It becomes possible to provide a good gas stove.

  However, when a dry battery 104 is used as a backup power source at the time of a power failure, if the power failure is resolved and power is restored, the dry battery 104 used as the backup power source is a DC power source obtained from AC 100 V of the commercial power source 101. (DC power supply circuit) Charged by direct current from 103, there is a risk of gas generation, liquid leakage, and in some cases bursting.

  On the other hand, as shown in FIG. 6, it is conceivable to insert a backflow prevention diode 105 such as a silicon diode into the output of the backup power supply 103. In such a configuration, when the dry battery 104 is used as a backup power source in the event of a power failure, the dry battery 104 used as the backup power source is also a commercial power source (AC 100 V) even when the power failure is resolved and power is restored. It is possible to prevent the battery from being charged by the direct current obtained from 101.

However, when a backflow prevention diode is inserted into the output of the backup power supply, the DC voltage supplied to the control circuit is reduced due to a forward voltage drop when a current flows through the backflow prevention diode in the forward direction. Become.
When a silicon diode is used as a backflow prevention diode, the forward voltage drop of a general silicon diode is about 0.5V to 0.7V. Therefore, when two dry batteries 3 as a backup power source are connected in series. A voltage lower by about 0.5V to 0.7V than the output voltage is supplied to the control circuit.

  By the way, for example, assuming a case where two dry batteries are used in series as a backup power supply, the rated voltage of the backup power supply is 3.0 V, and the termination when two dry batteries used for the backup power supply are connected in series Considering that it is appropriate to set the voltage to about 2.1 V, the forward voltage drop of 0.5 V to 0.7 V described above is not a small value, and the usable time of the dry battery as a backup power source is shortened. Is a factor.

JP 2008-16185 A

  The present invention solves the above-described problem. In a state where no power failure occurs, the direct current obtained from the commercial power source is used as the power source of the control circuit, so that the frequency of replacement of the battery as the backup power source is extremely high. The battery can be kept low, and it is easy to use, and even when a dry battery is used as a backup power source in the event of a power outage, the battery is charged by the direct current obtained from the commercial power source even if the power is removed and power is restored. An object of the present invention is to provide a gas stove that can extend the usable time of a battery as a backup power source by suppressing a voltage drop between the battery and a control circuit.

In order to achieve the above object, the gas stove of the present invention comprises:
In a gas stove comprising a stove burner, a control circuit for controlling the stove burner using a DC power source obtained from a commercial power source, and a backup power source for supplying power from a dry battery to the control circuit,
(A) a backflow prevention unit that prevents current from flowing from the backup power source to the DC power source, an output of the DC power source being connected to an input of the backflow prevention unit, and the control from the output of the backflow prevention unit It is configured to supply DC power to the circuit,
(B) Between the output of the backup power supply and the output of the backflow prevention unit, provided with a switching element that switches between a conduction state and a release state by a drive unit,
(C) The driving unit sets the switching element in a conductive state when the output voltage of the DC power supply is less than a predetermined conduction voltage, and turns the switching element on when the output voltage of the DC power supply is equal to or higher than a predetermined open-circuit voltage. It is configured to be in an open state.

In the gas stove of the present invention,
A reed switch is used as the switching element, and
A magnet that generates a bias magnetic field for the reed switch, and a coil that cancels the bias magnetic field when energized,
It is preferable that the permanent magnet and the coil constitute the drive unit.

  The gas stove according to the present invention is configured as described above, and includes (a) a backflow prevention unit that blocks current flow from the backup power supply to the DC power supply, and the output of the DC power supply is input to the backflow prevention unit. Connected, and configured to supply DC power to the control circuit from the output of the backflow prevention unit, and (b) between the output of the backup power supply and the output of the backflow prevention unit, the conduction state and the release state by the drive unit (C) when the drive unit makes the switching element conductive when the output voltage of the DC power supply is less than a predetermined conduction voltage, and when the output voltage of the DC power supply is equal to or higher than the predetermined open voltage Since the switching element is in an open state, even when a dry battery is used as a backup power source in the event of a power failure, the dry battery will not be Without being charged by the direct current is, by suppressing the voltage drop between reaching the control circuit from the battery, it is possible to increase the time available for batteries as a backup power source.

  That is, according to the gas stove of the present invention, in a state where no power failure occurs, the direct current obtained from the commercial power source is used as the power source of the control circuit so that the frequency of battery replacement is kept as low as possible. When a dry battery is used as a backup battery, it is possible to prevent a dry battery used as a backup power source from being charged by a direct current obtained from a commercial power supply (for example, AC100V) even if the power failure is resolved and power is restored. become. Furthermore, since the voltage drop between the backup power supply and the control circuit can be suppressed, it is possible to provide an easy-to-use gas stove that suppresses the reduction in the usable time of the dry battery as the backup power supply as much as possible. Become.

  In addition, when the above drive unit is configured with a reed switch as a switching element and a permanent magnet that generates a bias magnetic field for the reed switch and a coil that cancels the bias magnetic field when energized, the drive unit is complicated. Therefore, the present invention can be realized more effectively.

It is a circuit diagram which shows the power supply system | strain to the control circuit of the gas stove concerning embodiment of this invention. It is a perspective view of the gas stove concerning the embodiment of the present invention. It is a figure which shows the structure of the drive part at the time of using a reed switch as a switching element in the gas stove concerning embodiment of this invention, Comprising: It is a figure which shows the case where a switching element is a conduction | electrical_connection state. It is a figure which shows the structure of the drive part at the time of using a reed switch as a switching element in the gas stove concerning embodiment of this invention, Comprising: It is a figure which shows the case where a switching element is in an open state. It is a circuit diagram which shows the power supply system | strain to the control circuit assumed in the conventional gas stove. It is a circuit diagram which shows the power supply system | strain to the further another control circuit assumed in the conventional gas stove.

  Hereinafter, the embodiment of the present invention will be shown and the features thereof will be described in more detail.

[Embodiment]
As shown in FIG. 2, the gas stove 1 according to this embodiment includes a top plate 30 that constitutes the top surface portion of the gas stove main body 10, and a stove portion 2 a having two stove burners 21 and 22 disposed on the top plate 30. And a gas table stove provided with a grill 2b.

The gas stove 1 includes a control circuit 32 that controls the above-described stove burners 21 and 22.
The control circuit 32 uses a direct current (for example, 3.5 V) from a direct current power supply (DC power supply circuit) 33 obtained from a commercial power supply (AC100V) 31 as a power supply (see FIG. 1).

  The front panel 12 constituting the front surface of the stove body 10 has a point-extinguishing button 41 (41a) for the left-side stove burner 21, a point-extinguishing button 41 (41b) for the right-side stove burner 22, and a point for the grill burner. A fire extinguishing button 41 (41c) is provided. Further, a battery accommodating portion 42 is disposed on the front panel 12.

  Further, the gas stove 1 includes a backup power source 34 when the commercial power source (AC 100 V) 31 fails. The backup power source 34 supplies power to the control circuit 32 from the dry batteries 14a and 14b loaded in a battery case (not shown). (Refer to FIG. 1).

  In this embodiment, the backup power source 34 is configured by connecting two 1.5 V dry batteries in series in a battery case.

  In the gas stove 1 of this embodiment, the output of the DC power supply 33 is connected to the input (anode) of the backflow prevention unit (silicon diode) 35, and the output (cathode) of the backflow prevention unit (silicon diode) 35 is connected to the control circuit 32. The DC power as a power source for the control circuit 32 is supplied.

  Further, a switching element 50 is provided between the output of the backup power source 34 and the output (cathode) of the backflow prevention unit (silicon diode) 35.

  And the gas stove 1 of this embodiment is provided with the drive part 51 for driving the switching element 50, and as for the drive part 51, the output voltage of DC power supply 33 is less than predetermined | prescribed conduction voltage (for example, 0.2V). At this time, the switching element 50 is turned on, and the switching element 50 is opened when the output voltage of the DC power supply 33 is equal to or higher than a predetermined open voltage (for example, 1.6 V).

  Since the gas stove 1 according to this embodiment is configured as described above, the output voltage of the DC power supply 33 becomes a predetermined open circuit voltage (for example, 1.6 V) or more in a state where no power failure occurs. The switching element 50 is opened, the power supply from the backup power supply 34 to the control circuit 32 is cut off, and the direct current obtained from the commercial power supply (AC 100 V) 31 is used as the power supply for the control circuit 32. Therefore, it is possible to keep the replacement frequency of the battery for the backup power supply 34 extremely low, and the usability can be improved.

  When the commercial power supply (AC100V) 31 fails, the output voltage of the DC power supply 33 becomes less than a predetermined conduction voltage (for example, 0.2V) and the switching element 50 is turned on. Since 32 power supplies are supplied, the gas stove 1 can be used even in a power failure state.

  In addition, when a dry battery is used as the backup power source 34 at the time of a power failure, the switching element 50 is opened even when the power failure is resolved and power is restored, so that the dry battery used as the backup power source 34 is It is not charged by the direct current obtained from the commercial power supply (AC 100 V) 31. Therefore, it is possible to prevent the battery from leaking due to an increase in pressure inside the dry battery when the dry battery used as the backup power supply 34 is charged with a direct current obtained from the commercial power supply (AC 100 V) 31.

  Furthermore, by suppressing the voltage drop between the backup power supply 34 and the control circuit 32, it is possible to reliably suppress the shortened usable time of the dry battery used as the backup power supply 34.

  In addition, as the switching element 50, it is possible to use a contact of a 1b (one break) contact type relay that is generally commercially available. However, in the gas stove according to this embodiment, the reed switch 60 is connected to the switching element 50. It is used as.

  Hereinafter, the configuration and operation of the drive unit 51 when the reed switch 60 is used as the switching element 50 will be described.

  As is well known, the reed switch 60 as the drive unit 51 is sealed in a glass tube 62 so that a pair of leads 61a and 61b made of a ferromagnetic material are opposed to each other with a gap (FIGS. 3 and 3). 4).

  A permanent magnet 63 that generates a bias magnetic field is disposed along the reed switch 60.

  A coil 64 for canceling the bias magnetic field by energization is arranged along the reed switch 60.

  When the output voltage of the DC power supply 33 is less than a predetermined conduction voltage (for example, 0.2 V), as shown in FIG. 3, the N pole and S are applied to the pair of leads 61 a and 61 b by the bias magnetic field by the permanent magnet 63. When the poles are induced, a suction force is generated between the pair of leads 61a and 61b, the pair of leads 61a and 61b come into contact with each other, and the reed switch 60 becomes conductive.

  On the other hand, when the output voltage of the DC power supply 33 becomes equal to or higher than a predetermined open circuit voltage (for example, 1.6 V), a drive current is supplied from the DC power supply 33 to the coil 64, and the magnetic field generated by the coil 64 due to the supply of the drive current causes When the bias magnetic field by the permanent magnet 63 is canceled and the coil 64 is not energized, the attractive force generated between the pair of leads 61a and 61b by the N and S poles induced in the pair of leads 61a and 61b is reduced or reduced. The pair of leads 61a and 61b are restored by the elasticity of the leads 61a and 61b, and the reed switch 60 is opened (FIG. 4).

  As described above, the reed switch 60 is used as a switching element, and the drive unit 51 is configured by the permanent magnet 63 that generates a bias magnetic field for the reed switch 60 and the coil 64 that cancels the bias magnetic field when energized. In this case, the drive unit 51 can be configured without using a complicated configuration or expensive equipment.

  However, the drive unit 51 is not limited to the above-described configuration, and the drive unit 51 has a relay contact as a switching element, and the relay contact is appropriately turned on and off according to the output voltage of the DC power supply. The drive unit may be configured to switch to

  The present invention is not limited to the above embodiment in other points, and various modifications can be made within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Gas stove 2a Stove part 2b Grill part 10 Gas stove main body 12 Front panel 21, 22 Stove burner 30 Top plate 31 Commercial power supply (AC100V)
32 Control circuit 33 DC power supply (DC power supply circuit)
34 Backup power supply 35 Backflow prevention part 41 (41a, 41b, 41c) Point fire extinguishing button 50 Switching element 51 Drive part 60 Reed switch 61a, 61b A pair of lead 62 Glass tube 63 Permanent magnet 64 Coil

Claims (2)

In a gas stove comprising a stove burner, a control circuit for controlling the stove burner using a DC power source obtained from a commercial power source, and a backup power source for supplying power from a dry battery to the control circuit,
(A) a backflow prevention unit that prevents current from flowing from the backup power source to the DC power source, an output of the DC power source being connected to an input of the backflow prevention unit, and the control from the output of the backflow prevention unit It is configured to supply DC power to the circuit,
(B) Between the output of the backup power supply and the output of the backflow prevention unit, provided with a switching element that switches between a conduction state and a release state by a drive unit,
(C) The driving unit sets the switching element in a conductive state when the output voltage of the DC power supply is less than a predetermined conduction voltage, and turns the switching element on when the output voltage of the DC power supply is equal to or higher than a predetermined open-circuit voltage. A gas stove configured to be in an open state. A reed switch is used as the switching element, and
A magnet that generates a bias magnetic field for the reed switch, and a coil that cancels the bias magnetic field when energized,
The gas stove according to claim 1, wherein the permanent magnet and the coil constitute the drive unit.

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