JP2015042082A - Heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating cooker mainly powered by a battery which is configured to normally operate a drive system while extending a battery life.SOLUTION: In a heating cooker 1, when a voltage of a battery 12 detected by a voltage detection section is equal to or higher than a predetermined threshold, a first switch SW1 is turned to a nonconducting state and a second switch SW2 is turned to a conducting state to supply a driving current depending on an output voltage from a step-down circuit 18 to a load to be driven via a second conduction path L2. In a predetermined low voltage condition in which the voltage of the battery 12 detected by the voltage detection section is lower than the threshold, on the other hand, the first switch SW1 is turned to a conducting state and the second switch SW2 is turned to a nonconducting state to supply a driving current from a main power path La to the load to be driven via a first conduction path L1.

Description

  The present invention relates to a heating cooker.

  Many cooking devices such as gas stoves use a dry battery as a main power source. For example, in the technique of Patent Document 1, a constant voltage VR2 or the like is generated by a power supply circuit 20 that receives power supplied from a battery, and the microcomputer 16 or the like. The drive power is supplied to various parts.

JP-A-6-337115

  However, in the conventional example such as Patent Document 1, since only the power supply voltage VR2 generated by the power supply circuit 20 is used as the operating voltage of the drive system such as the microcomputer 16 or the solenoid valve drive circuit 19, the output from the power supply circuit 20 There is a problem that the operation of the drive system can be maintained only during a period in which the voltage VR2 exceeds a certain level. In other words, even if the output voltage of the battery as the main power source exceeds the certain level, driving is possible as long as the operation voltage exceeding the certain level (a level at which the drive system can be operated) cannot be stably generated by the power supply circuit 20. The system cannot be operated normally. In such a configuration, when the output voltage from the power supply circuit 20 does not exceed a certain level, the battery must be replaced even if the output voltage at the battery is at a certain level. Easy, battery replacement cycle must be faster.

  The present invention has been made to solve the above-described problems, and provides a configuration capable of operating a drive system normally while extending battery life in a heating cooker using a battery as a main power source. With the goal.

The present invention provides a battery,
Drive target load, and
A main power path connected to the battery;
A first energization path connected to the main power path and serving as an energization path between the main power path and the drive target load;
A second energization path that is configured as an energization path different from the first energization path and serves as an energization path between the main power path and the drive target load;
A step-down circuit provided in the second energization path and stepping down and outputting an input voltage from the main power path side;
A first switch for switching the first energization path between an energized state and a non-energized state;
A second switch for switching the second energization path between an energized state and a non-energized state;
A voltage detector for detecting the voltage of the battery;
When the voltage of the battery detected by the voltage detection unit is equal to or higher than a predetermined threshold, the second current path is switched by switching the first switch to a non-conductive state and the second switch to a conductive state. Through which the drive current corresponding to the output voltage from the step-down circuit is supplied to the load to be driven, and the battery voltage detected by the voltage detection unit is in a predetermined low voltage state that is less than the threshold. When the first switch is switched to the conductive state and the second switch is switched to the non-conductive state, the drive current from the main power path is supplied to the drive target load via the first current path. A controller to supply;
It is characterized by having.

According to the first aspect of the present invention, when the battery voltage detected by the voltage detection unit is equal to or higher than a predetermined threshold, the second switch is switched to the non-conductive state and the second switch is switched to the conductive state. When a drive current corresponding to the output voltage from the step-down circuit is supplied to the drive target load via the energization path, and the battery voltage detected by the voltage detection unit is in a predetermined low voltage state that is less than the threshold value. By switching the first switch to the conductive state and switching the second switch to the non-conductive state, the control unit supplies the drive current from the main power path to the drive target load via the first current path. Control is made.
In this configuration, when the battery voltage is relatively high and the output voltage from the step-down circuit can be easily maintained high, the drive target load is operated with the drive voltage (output voltage from the step-down circuit) kept lower than the battery voltage. Therefore, it becomes easy to operate the drive target load stably while suppressing power consumption. On the other hand, in this configuration, when the battery voltage becomes relatively low and the output voltage from the step-down circuit becomes difficult to maintain high, the drive current from the main power path is not driven through the step-down circuit. Therefore, even when the battery voltage is lowered to some extent, the battery can be continuously used as long as the voltage applied to the drive target load is maintained at a level capable of driving the drive target load. Since it has such a feature, in a cooking device using a battery as a main power source, it is possible to operate the drive system normally while extending the battery life.

In the invention of claim 2, when the control unit switches the first switch to the conductive state and switches the second switch to the non-conductive state, the battery voltage detected by the voltage detection unit thereafter becomes equal to or higher than the threshold value. Even in this case, the control for switching the first switch to the conductive state and the second switch to the non-conductive state is continued.
According to this configuration, it is possible to avoid a situation in which switching of the switch is frequently repeated when the battery voltage fluctuates in the vicinity of the threshold value.

The invention of claim 3 includes a plurality of gas burners, a common gas supply path that is a source of gas supply to the plurality of gas burners, and a plurality of branch paths that branch from the common gas supply path and follow each gas burner. A plurality of motors that are provided in a plurality of branch paths as drive target loads to which drive current is supplied from the step-down circuit and the main power path, and set the opening degree of the branch paths according to the rotation angle of the drive shaft And an original solenoid valve that is disposed at least in the common gas supply path and switches between opening and closing of the common gas supply path.
Since the configuration in which a plurality of motors and original solenoid valves are provided in this manner tends to increase power consumption and the battery life becomes more problematic, if the features of the present invention are applied to such a configuration, the characteristics of the present invention are further increased. Useful. In addition, with this configuration, when the battery voltage becomes relatively low, it is possible to simultaneously switch the supply source of the drive voltage to the plurality of motors and the original solenoid valve, and to stabilize all these drive units while extending the battery life Can be realized without complicated configuration and control.

FIG. 1 is a perspective view schematically illustrating the heating cooker according to the first embodiment. FIG. 2 is an explanatory view conceptually showing a gas supply path to each gas burner in the cooking device of FIG. FIG. 3 is a block diagram schematically illustrating an electrical configuration of the cooking device of FIG. FIG. 4 is a circuit diagram schematically illustrating a power supply circuit and the like used in the cooking device of FIG.

[First embodiment]
Hereinafter, a first embodiment embodying the present invention will be described with reference to the drawings.
(Overall configuration of cooking device)
The heating cooker 1 shown in FIG. 1 is configured as a built-in stove that can heat cooking utensils such as cooking pots. The cooking device 1 is provided with a right cooking unit 4a and a left cooking unit 4b so as to be exposed from a top plate 2 (top plate) constituting the upper surface of the cooking device body 1a. A small stove portion 4c is provided between the stove portions 4a and 4b and closer to the rear. A grill 3 is provided below the top plate 2 near the center of the inside of the heating cooker body 1a. The grill 3 is provided with a grill cabinet (not shown) for storing the food to be cooked and cooking with a grill burner (gas burner 54: FIG. 2), and this grill cabinet is provided on the front surface of the heating cooker body 1a. The grill door 3b provided can be opened and closed.

  Gas burners 51, 52, 53, and 54 shown in FIG. 2 are respectively provided on the right and left stove parts 4a, 4b, 4c, and grill 3 shown in FIG. As the gas supply path, a common supply path 60 (hereinafter also referred to as a gas supply path 60) serving as a common gas path to the plurality of gas burners 51, 52, 53, 54, and each gas burner 51 from the common supply path 60. , 52, 53, 54 are provided with a plurality of branch supply paths (hereinafter also referred to as branch paths) 61, 62, 63, 64. The common supply path 60 is provided with an original electromagnetic valve N1 that opens and closes the common supply path, and each branch supply path 61, 62, 63, 64 is provided with a thermal power adjustment valve and an opening / closing valve. ing.

  As shown in FIG. 2, for example, a branch supply path 61 to the gas burner 51 includes a safety valve 51 g that can open and close the branch supply path 61, a shut-off valve 51 f that can open and close the branch supply path 61, and gas to the gas burner 51. A thermal power adjustment valve 51e capable of adjusting the supply amount is provided. The safety valve 51g, the closing valve 51f, and the heating power adjustment valve 51e are driven by the stepping motor M1 shown in FIG. 3, and when the rotation angle of the stepping motor M1 falls within the first angle range, the safety valve 51g When the rotation angle of the motor M1 falls within the second angle range, the closing valve 51f opens, and when the rotation angle of the stepping motor M1 falls within the third angle range, the heating power adjustment valve 51e opens according to the rotation angle. The degree is set. That is, by controlling the rotation angle of the stepping motor M1, the opening / closing of the safety valve 51g, the closing valve 51f, and the opening degree of the heating power adjustment valve 51e can be controlled.

  As shown in FIG. 2, the branch supply path 62 to the gas burner 52 is also provided with a safety valve 52 g, a closing valve 52 f, and a heating power adjustment valve 52 e similar to the branch supply path 61, and the branch supply path 63 to the gas burner 53 is provided. Also, a safety valve 53g, a closing valve 53f, and a thermal power adjustment valve 53e similar to the branch supply path 61 are provided. The control of the safety valve 52g, the closing valve 52f, and the heating power adjustment valve 52e in the branch supply path 62 is the same as that of the branch supply path 61, and the safety valve 52g is controlled by controlling the rotation angle of the stepping motor M2 (FIG. 3). The opening / closing of the shut-off valve 52f and the opening degree of the heating power adjusting valve 52e can be controlled. Further, the control of the safety valve 53g, the closing valve 53f, and the heating power adjustment valve 53e in the branch supply path 63 is the same as that of the branch supply path 61, and the safety valve 53g is controlled by controlling the rotation angle of the stepping motor M3 (FIG. 3). The opening and closing of the shut-off valve 53f and the opening degree of the thermal power adjustment valve 53e can be controlled.

  As shown in FIG. 2, a branch supply path 64 to the gas burner 54 of the grill 3 includes a safety valve 54f that can open and close the branch supply path 64, and a thermal power adjustment valve 54e that can adjust the gas supply amount to the gas burner 54. And are provided. The safety valve 54f and the thermal power adjustment valve 54e are driven by a stepping motor M4 shown in FIG. 3, and the safety valve 54f is opened when the rotation angle of the stepping motor M4 falls within the first predetermined angle range. When the rotation angle of the stepping motor M4 falls within the second predetermined angle range, the opening degree of the thermal power adjustment valve 54e is set according to the rotation angle. In the example of FIG. 2, the heating power adjustment valve 54e that opens and closes by the control of the stepping motor M4 is illustrated. However, instead of the heating power adjustment valve 54e, an electromagnetic valve that opens and closes the supply path 65b to the lower burner 54b, An electromagnetic valve that opens and closes the supply path 65a to 54a may be provided, and the opening and closing of these electromagnetic valves may be controlled by a drive source other than the stepping motor M4. In this case, a bypass path parallel to the supply path 65a is provided so as to bypass the solenoid valve of the supply path 65a to the upper burner 54a, and when the solenoid valve of the supply path 65a is closed, gas is supplied to the upper burner 54a by the bypass path. The heating power of the upper burner 54a may be adjusted so that gas is supplied to the upper burner 54a by both the supply path 65a and the bypass path when the solenoid valve of the supply path 65a is open. The same applies to the lower burner 54b side, and a bypass path parallel to the supply path 65b is provided so as to bypass the electromagnetic valve of the supply path 65b to the lower burner 54b, and when the electromagnetic valve of the supply path 65b is closed, When the gas is supplied to the lower burner 54b and the solenoid valve of the supply passage 65b is open, the heating power of the lower burner 54b may be adjusted so that the gas is supplied to the lower burner 54b by both the supply passage 65b and the bypass passage. . The original solenoid valve N1 is configured as a known solenoid valve, for example, and can be switched between an open state and a closed state in accordance with a control signal from the microcomputer 10.

  In this configuration, as shown in FIG. 3, motor drive circuits 41 to 44 for driving the motors M1 to M4 are provided. Each of these motor drive circuits 41 to 44 is adapted to be applied with a drive voltage V3 generated by a power supply circuit 14 to be described later, and any of the motor drive circuits 41 to 44 has a motor corresponding to the drive signal from the microcomputer 10. Operates to drive. In addition, an electromagnetic valve driving circuit 45 for driving the original electromagnetic valve N1 is provided, and this electromagnetic valve driving circuit 45 is also applied with a driving voltage V3 generated by a power supply circuit 14 to be described later. 10 is driven to open the original electromagnetic valve N1 in response to the opening instruction signal from 10, and is driven to close the original electromagnetic valve N1 in response to the closing instruction signal from the microcomputer 10. In this configuration, each of the stepping motors M1 to M4, the original solenoid valve N1, and the drive circuits 41 to 45 that drive these correspond to an example of a drive target load.

  Further, four rotation operation portions 6 are provided so as to correspond to the right stove portion 4a, the left stove portion 4b, the small stove portion 4c, and the grill 3, respectively. The first rotation operation unit 6a, the second rotation operation unit 6b, and the third rotation operation unit 6c are provided so as to be exposed from the right front panel 7a. It should be noted that the rotation operation unit 6a corresponding to the right cooking unit 4a is on the right side, and the rotation operation unit 6b corresponding to the left kitchen unit 6b is on the left side so as to match the actual positional relationship with each cooking unit. A rotation operation unit 6c corresponding to the stove unit 4c is disposed between the rotation operation units 6a and 6b. The fourth rotation operation unit 6d corresponding to the grill 3 is provided so as to be exposed from the left front panel 7b.

  The first rotation operation unit 6a performs ignition, extinguishing, and heating power adjustment of the right cooking unit 4a, is configured to be capable of pressing operation, and is configured to be capable of rotation operation. For example, at the time of fire extinguishing, as shown by the solid line in FIG. 1, the front surface portion of the rotary operation portion 6 a configured in a cylindrical shape is retracted backward. Then, by pressing the front surface portion from this state, the right cooking portion 4a is ignited, and as shown by the two-dot chain line 6 ′, the rotation operation portion 6a is moved forward from the time of extinguishing the fire. It is designed to protrude. Moreover, by rotating the rotation operation part 6a in one rotation direction in such a protruding state, the heating power of the corresponding right cooking unit 4a can be increased, and conversely, the rotation operation part 6a is changed to the other By rotating in the direction of rotation, it is possible to reduce the heating power of the corresponding right cooking unit 4a. Further, when the front portion is pressed in the protruding state indicated by the two-dot chain line 6 ′, the retracted state indicated by the solid line is restored, and at this time, the right cooking portion 4 a is extinguished.

  The rotation operation unit 6b performs ignition, extinguishing, and heating power adjustment of the left cooking unit 4b, the rotation operation unit 6c performs ignition, extinguishing, and heating power adjustment of the small cooking unit 4c, and the rotation operation unit 6d includes Ignition, extinguishing, and heating power adjustment of the grill 3 are performed. These are different in object, but the basic structure and function are the same as those of the rotation operation unit 6a. In addition, switch units 30a, 30b, 30c, and 3d are provided so as to correspond to the rotation operation units 6a, 6b, 6c, and 6d, respectively. These switch sections 30 give an off signal to the microcomputer 10 when the corresponding rotation operation section 6 is at the retracted position (fire extinguishing position), and the microcomputer 10 when the corresponding rotation operation section 6 is at the protruding position (ignition position). Is configured to give an ON signal.

(Configuration of power supply circuit)
Next, the configuration of the power supply circuit will be described with reference to FIG. 4 shows only the drive circuit 41 of the plurality of drive circuits 41 to 45 and schematically shows the circuit configuration, but in actuality, the voltage generated by the power supply circuit 14 as shown in FIG. V3 is supplied to any one of the drive circuits 41 to 45.

  In this configuration, a battery 12 made of a dry battery or the like is provided as a main power source. The main power path La is connected to the positive electrode of the battery 12, the negative electrode of the battery 12 is connected to the ground, and the booster circuit 22 of the power supply circuit 14 is connected to the main power path La. Has been. The booster circuit 22 is configured by a known booster circuit, boosts the output voltage V1 from the battery 12 to a higher voltage V2, and supplies the output voltage V2 as an operating power source for the microcomputer 10, for example. ing. That is, the power supply potential input to the microcomputer 10 is higher than the potential of the positive electrode of the battery 12.

  A switch SW1 and a switch SW2 are connected in parallel to the main power path La connected to the battery 12. Specifically, two conductive paths (a first energization path L1 and a second energization path L2) branch from the main power path La with the connection portion A1 as a starting point. And switch SW1 is arrange | positioned so that the 1st electricity supply path L1 (1st path | route between the connection part A1 and the connection part A2) may be switched to an energized state and a non-energized state. The first energization path L1 is a portion that is connected between the main power path La and the power supply line Lb and serves as an energization path between the main power path La and the drive target load. In addition, the switch SW2 is arranged so as to switch the second energization path L2 (second path between the connection part A1 and the connection part A2) between the energized state and the non-energized state. The second energization path L2 is configured as an energization path different from the first energization path L1 between the main power path La and the power supply line Lb, and is a portion that becomes an energization path between the main power path La and the drive target load. is there. The power supply line Lb is a portion arranged on the downstream side (low potential side) of the switch SW1 and the downstream side (step-down voltage output side) of the step-down circuit 18, and the power supply voltage V3 supplied to each of the drive circuits 41 to 45. Is a conductive path to which is applied.

  The switches SW1 and SW2 are configured as, for example, P-channel MOSFETs. In the example of FIG. 4, the gates of the switches SW1 and SW2 are connected to the terminals of the microcomputer, and the sources are connected to the main power path. Connected to La. The source of the switch SW1 is connected to the power supply line Lb, and the source of the switch SW2 is connected to the step-down circuit 18. An H level signal or an L level signal is output from each terminal provided in the microcomputer 10 to each gate. For example, the switch SW1 is turned on when an ON signal is given to the gate from the microcomputer 10, and during this ON operation, the first current path L1 is set so that the main power path La and the power line Lb are conducted. Is made conductive. Similarly, the switch SW2 is turned on when an on signal is given to the gate from the microcomputer 10, and during this on operation, the second power line La and the power supply line Lb are made conductive. The electric circuit L2 is set in a conductive state.

  The step-down circuit 18 is configured as a known step-down circuit using a coil L, a diode D, and a switching control unit 18a. The step-down circuit 18 has a second current path L2 (specifically, between the switch SW2 and the connection unit A2). The input voltage applied via the main power path La is stepped down to a potential lower than the potential of the main power path La and output. Specifically, when the switch SW2 is in an on state, the input voltage on the drain side of the switch SW2 is stepped down and an output voltage of a predetermined potential (eg, 2.2 V) is applied to the power supply line Lb. . Note that the step-down circuit 18 shown in FIG. 4 is merely an example, and various configurations can be applied as long as it is a known step-down circuit that can step down the voltage on the drain side of the switch SW2 as an input voltage.

  In this configuration, the power supply circuit 14 operates when a power switch (not shown in FIG. 4) is turned on and is controlled by the microcomputer 10, and immediately after the power switch is turned on (power-on). Immediately after that, for example, the switch SW2 is turned on and the switch SW1 is turned off. Further, the microcomputer 10 functions as a voltage detection unit that detects the voltage of the battery 12, and continuously detects the battery voltage immediately after the power switch is turned on (immediately after the power is turned on). Further, the microcomputer 10 functions as a control unit, determines whether or not the voltage V1 of the battery 12 is equal to or higher than a predetermined threshold (for example, 2.8V), and the voltage V1 of the battery 12 is equal to or higher than the predetermined threshold. The first switch SW1 is switched to the non-conductive state and the second switch SW2 is switched to the conductive state, so that the drive current corresponding to the output voltage from the step-down circuit 18 can be supplied via the second current path L2. Supply to the target load. That is, when the voltage V1 of the battery 12 is equal to or higher than a predetermined threshold value, the first switch SW1 is turned off and the second switch is turned on, so that a voltage equivalent to the output voltage V1 from the battery 12 is a step-down circuit. The voltage of a predetermined potential (for example, 2.2 V) that is input to 18 and reduced is output to the power supply line Lb. In this case, the output voltage from the step-down circuit 18 becomes the supply voltage V3 to the drive circuits 41 to 45 that drive the motors M1 to M4 and the original solenoid valve N1, and the drive current generated based on the supply voltage V3 is It is supplied to the drive target load. Note that the battery voltage detection method by the microcomputer 10 may directly detect the battery voltage V1 by a known voltage detection method, or indirectly detect the battery voltage by detecting the voltage V2 boosted by the booster circuit 22. (In this case, it may be determined whether or not the voltage V1 is equal to or higher than a predetermined threshold by determining whether or not the voltage V2 is equal to or higher than a certain threshold). Further, a threshold value (for example, a value of 2.8V) for determining the voltage V1 of the battery 12 may be stored in a memory (not shown), and for switching between the first switch SW1 and the second switch SW2. A threshold value may be written in a program (a program executed by the microcomputer 10), and this program may be stored in a memory (not shown).

  On the other hand, the microcomputer 10 switches the first switch SW1 to the conducting state and the second switch SW2 to the non-conducting state when the voltage V1 of the battery 12 is in a low voltage state where the voltage V1 is less than a predetermined threshold (for example, 2.8V). By switching to, the drive current from the main power path La side is supplied to the drive target load via the first energization path L1. That is, when the voltage V1 of the battery 12 is less than the predetermined threshold value, the first switch SW1 is turned on and the second switch is turned off, so that the main power path La and the power supply line Lb are connected via the switch SW1. Conduct. Therefore, a voltage equivalent to the output voltage V1 from the battery 12 is applied to the power supply line Lb, and becomes the supply voltage V3 to the drive circuits 41 to 45 that drive the motors M1 to M4 and the original solenoid valve N1. A drive current generated based on the supply voltage V3 is supplied to each drive target load.

  In this configuration, when the voltage of the battery 12 is relatively high and the output voltage from the step-down circuit 18 can be easily maintained high, the drive voltage (the output voltage from the step-down circuit 18) suppressed to be lower than the voltage of the battery 12. Since the drive target load is operated by the above, it becomes easy to stably operate the drive target load while suppressing power consumption. On the other hand, when the voltage of the battery 12 becomes relatively low and it becomes difficult to maintain the output voltage from the step-down circuit 18 high, the drive current from the main power path La is driven without passing through the step-down circuit 18. Even when the voltage of the battery 12 is lowered to some extent, the battery 12 is continuously used as long as the voltage V3 applied to the drive target load is maintained at a level capable of driving the drive target load. be able to. Since it has such a feature, in the cooking device 1 using the battery 12 as a main power source, the drive system can be normally operated while extending the life of the battery 12.

  Further, in this configuration, the microcomputer 10 corresponding to the control unit temporarily switches the first switch SW1 to the conductive state and the second switch SW2 to the nonconductive state due to a decrease in the voltage of the battery 12, and thereafter Even when the voltage of the battery 12 becomes equal to or higher than the threshold value, the control for switching the first switch SW1 to the conductive state and switching the second switch SW2 to the non-conductive state is continued. According to this configuration, it is possible to avoid a situation in which switching of the switch is frequently repeated when the voltage of the battery 12 fluctuates in the vicinity of the threshold value.

  Moreover, the heating cooker 1 which concerns on this structure is a common source which supplies the gas to several gas burners 51, 52, 53, 54 and several gas burners 51, 52, 53, 54 like FIG. A gas supply path 60 and a plurality of branch paths 61, 62, 63, 64 branched from the common gas supply path 60 and continuing to the gas burners 51, 52, 53, 54 are provided. The drive target loads to which the drive current is supplied from the step-down circuit 18 and the main power path La are provided in the plurality of branch paths 61, 62, 63, 64, respectively, and the branch path 61 according to the rotation angle of the drive shaft. , 62, 63, 64, specifically, a plurality of motors M1, M2, M3, M4 for setting the opening degrees (specifically, the respective opening degrees of the thermal power control valves 51e, 52e, 53e, 54e) and a common gas supply An original solenoid valve N1 that is disposed in the path 60 and switches between opening and closing of the common gas supply path 60 is provided. Since the configuration in which the plurality of motors M1, M2, M3, and M4 and the original solenoid valve N1 are provided in this manner tends to increase power consumption and the life of the battery 12 becomes more problematic, It is even more useful if the features of the present invention are applied. Further, in this configuration, when the voltage of the battery 12 becomes relatively low, the supply sources of the drive voltages for the plurality of motors M1, M2, M3, and M4 and the original solenoid valve N1 can be switched at the same time. Thus, it is possible to realize a configuration capable of stably operating all of these drive units while extending the life of the twelve without complicated configuration or control.

  Further, in the configuration in which a plurality of gas burners 51, 52, 53, and 54 are provided as in this configuration, a plurality of drive sources (a plurality of motors M1, M2, M3, and M4 and the original solenoid valve N1) operate at the same time. Therefore, short-term voltage fluctuations caused by the simultaneous operation of a plurality of drive sources are also assumed. In such a configuration, it is also assumed that the battery voltage V1 suddenly decreases to a level that cannot be stably supplied by the step-down circuit 18. In such a method that determines the battery life when the voltage decreases, the battery is more It becomes difficult to use for a long time. In contrast, in this configuration, even if the battery voltage suddenly drops below a predetermined threshold (for example, 2.8 V), the battery can continue to be used while being maintained at a certain low level. Thus, the configuration is advantageous against sudden voltage fluctuations. The microcomputer 10 prohibits the operation of the drive target load described above (for example, when the battery voltage V1 becomes less than the second threshold value (for example, 2.3 V) lower than the predetermined threshold value (for example, 2.8 V) (for example, The switches SW1 and SW2 are both turned off, and the supply of the operating voltage V3 to the drive target load is stopped), and the use of the device itself is prohibited. In this case, when the battery voltage V1 is less than the second threshold value, it is preferable to perform a notification operation (for example, a buzzer sound) or display an error code on the display unit.

DESCRIPTION OF SYMBOLS 1 ... Cooking device 10 ... Microcomputer (a control part, a voltage detection part)
DESCRIPTION OF SYMBOLS 12 ... Battery 18 ... Step-down circuit 51, 52, 53, 54 ... Gas burner 60 ... Common gas supply path 61, 62, 63, 64 ... Branch path La ... Main electric power path L1 ... 1st electricity supply path L2 ... 2nd electricity supply path M1, M2, M3, M4 ... Motor (drive target load)
N1 ... Solenoid valve (load to be driven)
N1 ... Former solenoid valve (load to be driven)
SW1 ... 1st switch SW2 ... 2nd switch

Claims (3)

Battery,
Drive target load, and
A main power path connected to the battery;
A first energization path connected to the main power path and serving as an energization path between the main power path and the drive target load;
A second energization path that is configured as an energization path different from the first energization path and serves as an energization path between the main power path and the drive target load;
A step-down circuit provided in the second energization path and stepping down and outputting an input voltage from the main power path side;
A first switch for switching the first energization path between an energized state and a non-energized state;
A second switch for switching the second energization path between an energized state and a non-energized state;
A voltage detector for detecting the voltage of the battery;
When the voltage of the battery detected by the voltage detection unit is equal to or higher than a predetermined threshold, the second current path is switched by switching the first switch to a non-conductive state and the second switch to a conductive state. Through which the drive current corresponding to the output voltage from the step-down circuit is supplied to the load to be driven, and the battery voltage detected by the voltage detection unit is in a predetermined low voltage state that is less than the threshold. When the first switch is switched to the conductive state and the second switch is switched to the non-conductive state, the drive current from the main power path is supplied to the drive target load via the first current path. A controller to supply;
A cooking device characterized by comprising:   When the control unit switches the first switch to a conductive state and switches the second switch to a non-conductive state, the voltage of the battery detected by the voltage detection unit thereafter becomes equal to or higher than the threshold value. However, the control of switching the first switch to the conductive state and switching the second switch to the non-conductive state is continued. Multiple gas burners,
A common gas supply path as a source of gas supply to the plurality of gas burners;
A plurality of branch paths branched from the common gas supply path and continuing to each gas burner;
With
As the drive target load to which drive current is supplied from the step-down circuit and the main power path,
A plurality of motors that are respectively provided on the plurality of branch paths and set the opening of the branch paths according to the rotation angle of the drive shaft;
An original solenoid valve that is disposed at least in the common gas supply path and switches between opening and closing the common gas supply path;
The cooking device according to claim 1 or 2, wherein the cooking device is provided.

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