JP2006300452A - Display device for apparatus using dry battery as power source - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device capable of reducing the number of times of replacing dry batteries by delaying replacement timing of the dry batteries. <P>SOLUTION: The display device is provided with the dry battery 22, a battery voltage monitoring circuit 24, a battery replacement indicating lamp 14, and a display part 15 displaying an operation error of a load. When a battery voltage is a first set value or more, the battery replacement indicating lamp 14 is in an off state. When the battery voltage is between the first set value and a lower second set value, the battery replacement indicating lamp 14 is flickered. When the battery voltage is the second set value or more, and a control circuit judges that operation of the load is abnormal on the basis of a signal from a sensor relevant to the load and stops driving of the load, operation error of the load is displayed in an error display part 36 of the display part 15. When the battery voltage drops below the second set value, and the load does not operate normally, it is displayed that the dry battery has reached the replacement timing in the display part 15, and driving of the load is stopped. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a display device that uses a dry battery as a power source and drives a drive element such as an electronic component mounted on an appliance with the output power of the dry battery.

In a device that drives a load (driving element) using a dry battery as a power source, the battery voltage decreases as the load is driven. In such an instrument, conventionally, the battery replacement time has been notified by some means before the battery voltage drops and the load cannot be operated safely. For example, in the case of an appliance in which two 1.5V dry batteries are connected in series, the LED (lamp) blinks without stopping the appliance operation when the initial 3.0V battery voltage falls below 2.2V. First, the user is notified that the battery replacement time is approaching. Thereafter, when the battery voltage further decreased and reached a final voltage of 2.0 V which was preset as the lower limit operating voltage of the load, the LED was turned on for safety reasons to stop the operation of the instrument.
Patent Document 1 proposes a combustion appliance in which a dry battery can be used as long as possible and the load operates safely. This combustion appliance is provided with a battery check means for monitoring the voltage across the terminals of the dry cell, and a starting voltage drop value when driving a plurality of loads such as an igniter and an electromagnetic safety valve, and a steady voltage drop in a stable period after the initial driving. The threshold value of the voltage between the terminals is determined from the value so that the operation of the appliance is uncertain and dangerous, and the input voltage limit value of the load that requires the highest voltage between the terminals is set as the predetermined value. When it falls below, the operation of the instrument is stopped.
JP-A-5-87338

However, in the combustion appliance of Patent Document 1, the dry cell voltage is not remarkably lowered, and even if the power for driving the load can be normally supplied yet, the operation of the appliance is stopped for some reason. Since it was determined that the voltage was lowered and the battery was replaced, there were many problems that the battery was replaced many times and power loss occurred.
Accordingly, an object of the present invention is to eliminate the above-mentioned problems of the prior art, and to provide a display device capable of delaying the replacement time of the dry battery and reducing the number of replacements.

  In order to solve the above-described problems, the present invention includes a dry battery, a battery voltage monitoring circuit that monitors the voltage of the dry battery, a battery replacement indicator lamp, and a display unit that displays a load operation error, and uses the dry battery as a power source. In the display device of the instrument driven by the load, when the battery voltage is equal to or higher than the first set value, the battery replacement indicator lamp is turned off, and the battery voltage decreases to be lower than the first set value. When it is between the second set values, the battery replacement indicator is blinked or lit, and when the battery voltage is equal to or higher than the second set value, it is based on a signal from a sensor provided in relation to the load. When the control circuit determines that the load operation is abnormal and stops driving the load, the load operation error is displayed on the display unit, and the battery voltage further falls below the second set value. If the load does not work properly, Pond displayed on the display unit that has reached the replacement time, characterized by stopping the driving of the load.

The display device of the present invention relates to a device in which a load (driving element) is driven by output power using a dry battery as a power source. When the voltage of the dry battery is equal to or higher than the first set value, the battery replacement indicator lamp is turned off. When the battery voltage is between the first set value and the second set value lower than the first set value, the battery replacement indicator is blinked or lit. In addition, when the battery voltage is equal to or higher than the second set value, the control circuit determines that the operation of the load is abnormal based on a signal from a sensor provided in the appliance in relation to the load, and drives the load. When stopped, the operation error of the load is displayed on the display unit. In addition, when the battery voltage drops below the second set value, if the load does not operate normally, the dry battery must be replaced even if the control circuit determines that the load operation is abnormal. The fact that the time has come is displayed on the display unit, and the driving of the load is stopped.
As described above, when the dry battery has a voltage sufficient to drive the load normally, when the load driving is stopped, that is, when the operation of the appliance is stopped, an operation error of the load is displayed on the display unit. In addition, when the battery voltage drops below the second set value and the load does not operate normally, it is displayed on the display that the dry battery has reached the time for replacement. The timing can be delayed, the number of exchanges can be reduced, and power loss can be reduced. And if a dry cell is newly replaced | exchanged, a battery voltage will be restored to the state more than a 1st setting value.

An instrument having a display device of the present invention includes a dry battery for driving a load, a battery voltage monitoring circuit for monitoring the voltage of the dry battery, a battery replacement indicator lamp, and a display unit for displaying an operation error of the load. Yes. Taking the gas stove as an example of such a device, the present invention will be described in detail below.
FIG. 1 is a perspective view of a gas stove showing an embodiment of the present invention facing an opening of a countertop. The gas stove 1 is a drop-in stove that is hung on the opening edge of the counter top 2 by lowering the thin rectangular main body 4 having an open upper surface into the opening 3 opened in the counter top 2 of the kitchen. is there. The gas stove 1 shown in FIG. 1 has three stove burners. A standard burner 6 is provided at the front left opening of the top plate 5 covering the top opening of the stove body 4, and a large burner is provided at the right opening. 7. The small burner 8 faces the rear central opening.
The standard burner 6 is a burner used for a plurality of cooking such as fried foods. When the pan (cooking container) is placed on each of the stove burners 6 to 8, the bottom of the pan comes into contact with a vertically movable thermal head biased upward by a spring to detect the temperature of the pan bottom. Pan bottom temperature sensors 6a to 8a are provided. A grill portion 9 for cooking grilled food is provided in the substantially central interior of the stove body 4, and a grill burner 10 (see FIG. 2) is disposed in the grill portion 9.

Stove operation knobs 11a to 11c and grill operation knobs 11d are provided on the right and left sides of the front surface of the main body 4 so as to be able to protrude and retract. Ignites. Moreover, the heating powers of the stove burners 6 to 8 and the grill burner 10 are adjusted by rotating the knobs 11a to 11d. Above the knobs 11a to 11c and on the left side of the knob 11d, thermal power indicator lamps (LEDs) 12a to 12d that are turned on when the respective burners 6 to 8 and 10 are lit are provided for confirmation of ignition. The thermal power indicator lamps 12d of the grill burner 10 are provided in two upper and lower stages, displaying the thermal power of the upper fire burner on the upper stage and displaying the thermal power of the lower fire burner on the lower stage.
A battery chamber 13 for accommodating a dry battery is provided in the stove body 4 below the knob 11d of the grill burner so as to be freely accessible. Between the knob 11d and the battery chamber 13, there is provided a battery replacement indicator lamp 14 which blinks when the voltage of the dry battery decreases and the battery replacement time approaches. Further, below the knobs 11a to 11c, a display unit 15 including a flat type operation display panel in which operation switches are formed by sheet keys is provided, and when the front cover 15a is pressed, the display unit 15 advances to the front. So that it can be freely moved in and out. Reference numeral 16 denotes a power switch, and 9a denotes an exhaust port communicating with the inside of the grill of the grill portion 9.

  FIG. 2 is a schematic diagram of a gas circuit of the gas stove 1. In FIG. 2, the downstream of the main valve 18 interposed in the gas circuit 17 communicates with the stove burners 6 to 8 and the upper burner 101 and the lower fire burner 102 via the branch path. Reference numerals 19a to 19c in FIG. 2 denote cooking containers (pots), and the temperature of the pot bottom is detected by the pot bottom temperature sensors 6a to 8a. Electromagnetic safety valves 6b, 7b, 8b, and 10b and stepping motor driven flow rate adjusting electric valves 6c, 7c, 8c, and 10c are interposed in each branch passage that communicates with the burners 6 to 8, and 10, respectively. In the vicinity of the stove burners 6 to 8, ignition electrodes 6d, 7d, and 8d that generate a spark discharge at the time of ignition, and flame detection sensors 6e, 7e, and 8e that monitor the combustion of the burner are disposed. Similarly, ignition electrodes 101d and 102d and flame detection sensors 101e and 102e are disposed in the vicinity of the upper fire burner 101 and the lower fire burner 102.

As shown in FIG. 3, in the control electric circuit 20 of the gas stove 1, a control circuit (CPU) 21 is connected to a dry cell 22 as a stove power supply via a transistor 23 a and a booster circuit 23. In this embodiment, the power source is one in which two single dry batteries 22 having a rated voltage of 1.5 V are connected in series. Connected to the control circuit 21 are a battery voltage monitoring circuit 24 connected to the dry battery 22, an igniter 25, a piezoelectric buzzer 26, the thermal power indicator lamps 12 (12 a to 12 d), and a battery replacement indicator lamp 14. The power switch 16 is connected between the dry battery 22 and the booster circuit 23. Further, the display circuit 27 and the reset circuit 28 of the display unit 15 are connected to the control circuit 21 through the booster circuit 23.
Further, the control circuit 21 has a drive position for detecting the drive positions of the stepping motors 31a to 31d that are rotationally driven by input signals to the ignition switches 29a to 29d of the operation knobs 11a to 11d and the rotation angle detection sensors 30a to 30d. Each signal of the sensors 32a to 32d is input. Based on these input signals, the control circuit 21 controls the opening operation of the main plug 18 of the gas circuit 17 and the electromagnetic safety valves 6b to 8b and 10b and the opening degree of the flow rate adjusting electric valves 6c to 8c and 10c. In addition, the control circuit 21 receives the signals of the pan bottom temperature sensors 6a to 8a and the flame detection sensors 6e to 8e, 101e, and 102e of the stove burners 6 to 8, and outputs the electromagnetic waves according to the output signals from the control circuit 21. The valve closing operation of the safety valves 6b to 8b and 10b is controlled. The main plug 18 composed of a solenoid valve incorporates a holding winding 33 a connected to the booster circuit 23 and an adsorption winding 33 b connected to the dry battery 22, and these windings 33 a and 33 b are connected to the control circuit 21. ing.

Next, the operation of the gas stove 1 will be described using the standard burner 6 among the burners 6 to 8 and 10 as an example.
First, after the power switch 16 is turned on, when the operation knob 11a of the burner 6 is pushed in, a spring mechanism (not shown) is activated, the knob 11a protrudes forward, and the ignition switch 29a indicates that an ignition operation has been performed. This is detected and this detection signal is input to the control circuit 21. An operation signal is output from the control circuit 21, the transistors 34a and 34b are turned on, and the holding winding 33a of the solenoid valve (original valve) 18 is excited, but the solenoid valve 18 does not open because the attractive force is weak. . Thereafter (about 100 msec), the transistor 35 is turned on, the adsorption winding 33b is excited, the electromagnetic valve 18 is opened, the valve opening holding current flows through the electromagnetic safety valve 6b, the valve opening is held, and the fuel gas is burned. To be supplied. Next, the switching transistor 25a upstream of the igniter 25 is turned on to operate the igniter 25 for a predetermined time, and the burner 6 is ignited by the spark discharge of the ignition electrode 6d.

When the burner 6 ignites and starts combustion, the thermal power indicator lamp 12a is turned on, the adsorption winding 33b is demagnetized, the combustion flame of the burner 6 is detected by the flame detection sensor 6e, and the detection signal of the flame detection sensor 6e is It is continuously input to the control circuit 21. Based on this detection signal, completion of ignition of the burner 6, blow-off after the start of combustion, etc. are monitored, and when the flame detection sensor 6e stops detecting the combustion flame, the holding current to the electromagnetic safety valve 6b is stopped. The safety valve 6b closes and combustion stops. Further, by rotating the knob 11a, the rotation angle detection sensor (encoder) 30a detects the rotation angle of the operation shaft of the knob 11a, and the rotation shaft connected to the flow rate adjusting electric valve 6c is rotated by the stepping motor 31a. By doing so, the opening degree of the electric valve 6c is adjusted while the driving position is detected by the driving position sensor 32a of the stepping motor 31a, and the heating power of the burner 6 is adjusted.
Thereafter, when the operation knob 11a is pushed in again, the knob 11a is immersed flush with the front surface of the main body 4, and the ignition switch 29a detects that a fire extinguishing operation has been performed, and this detection signal is input to the control circuit 21. Is done. An operation signal is output from the control circuit 21, and this output signal stops the holding current to the electromagnetic safety valve 6b, the electromagnetic safety valve 6b is closed and combustion is stopped, and the thermal power indicator lamp 12a is turned off.

The operation of the gas stove 1 related to the burner 6 and the control by the electric circuit 20 are the same for the other burners 7, 8, 10.
By the way, when the load of the gas stove 1 is operated, the capacity (battery voltage) of the dry cell 22 gradually decreases. The battery voltage monitoring circuit 24 is connected to the control circuit 21 in the electric circuit 20 of the gas stove 1. When the battery voltage of the dry battery 22 decreases to the first set value (for example, 2.2 V), the battery replacement indicator lamp 14 blinks. Further, when the battery voltage is equal to or higher than a second set value (for example, 2.0 V) between the ignition of each of the burners 6 to 8 and 10 and extinguishing, for example, the flow rate adjusting motor operated valves 6c, 7c, 8c, and 10c are used. When the sensors related to the load detect the operation of the load, such as the drive position sensors 32a to 32d of the stepping motors 31a to 31d attached to the control circuit 21, the control circuit 21 determines that the load is abnormal and stops driving the load. Displays a blinking operation error of the load on the display unit 15. The display unit 15 includes an error display unit 36 that displays a load operation error and an operation error, and that the dry battery 22 has reached the replacement time (battery replacement error) using two 7-segment LEDs. Examples of error codes include burner continuous use (2 hours or more) “00”, overheating (290 ° C. or more) “14”, pan bottom temperature sensor circuit based on the output signal of a timer circuit that measures the elapsed time from the start of ignition. There is a failure “70”, an electromagnetic safety valve circuit failure “71”, and the like.
When the battery voltage drops below the second set value, the load is likely not to operate normally. Therefore, if the load does not operate normally when the battery voltage drops below the second set value, it is considered that the battery 22 has reached the replacement time, and a battery replacement error is displayed on the display unit 15. Flashes and stops driving the load.

  Here, as the load in the gas stove 1, the holding winding 33a and the suction winding 33b (main valve 18), the stepping motors 31a to 31d, the thermal power indicator lamps 12a to 12d, the battery replacement indicator lamp 14, the display unit 15, Electromagnetic safety valves 6b to 8b and 10b, and an igniter 25 are included. Among these loads, the stepping motors 31a to 31d having the largest voltage drop during driving consume the battery capacity most, so that the operation states of the flow rate adjusting motor operated valves 6c to 8c and 10c are usually determined by the drive position sensors 32a to 32d. When the detected operation becomes unstable, it becomes an indication of the replacement time of the dry battery 22.

Further, the control of the gas stove related to the battery voltage applied to the load will be described with reference to the flowchart shown in FIG.
In the gas stove 1, when any one of the operation knobs 11a to 11d of the burners 6 to 8 and 10, for example, the knob 11a is pressed to start the gas stove 1, the control circuit 21 receives an operation signal from the ignition switch 29a. Is determined (step S1). When the ignition operation is correctly performed, based on the input signal from the battery voltage monitoring circuit 24, the control circuit 21 determines whether or not the voltage of the dry battery 22 is equal to or higher than the first set value of 2.2V. (Step S2). When the battery voltage is 2.2 V or higher, every time the load (stepping motor 31a) is driven during operation of the gas stove 1, a signal corresponding to the driving position of the stepping motor 31a is sent from the driving position sensor 32a to the control circuit 21. Based on this input signal, the control circuit 21 determines whether or not the relationship between the pulse output for driving the stepping motor 31a and the drive position is normal (step S3). If it is normal, the battery replacement indicator lamp 14 is turned off, and steps S2 and S3 are repeated. On the other hand, when the control circuit 21 determines that the operation of the load is not normal, the display of the operation error of the load flashes on the error display unit 36 of the display unit 15 and no further command is output to the load. The driving of the load is stopped (step S4).

In step S2, when the battery voltage is less than 2.2V, the process proceeds to step S5. During this time, the control circuit 21 determines whether or not the battery voltage has decreased to less than the second set value of 2.0V. Further, the battery replacement indicator lamp 14 is blinked (step S6), and the control circuit 21 has a normal relationship between the pulse output for driving the load (for example, the stepping motor 31a) and the drive position in the same manner as in step S3. Whether or not (step S7). If normal, steps S5 to S7 are repeated. When it is not normal, the process proceeds to step S4, and the display of the operation error of the load blinks on the error display unit 36, and the drive of the load is stopped without outputting any more command to the load.
Even if the battery voltage drops below 2.0V due to repeated driving of the load, the battery replacement indicator lamp 14 is still blinking (step S8), and the control circuit 21 drives the load (stepping motor 31a) each time. Then, it is determined whether or not the relationship between the pulse output for driving the stepping motor 31a and the drive position detected by the drive position sensor 32a is normal (step S9). If normal, steps S8 and S9 are repeated. However, when the control circuit 21 determines that the operation of the load is not normal, the battery replacement error display is blinked on the error display unit 36, the battery replacement indicator lamp 14 is switched from blinking to lighting, and driving of the load is stopped. (Step S10).

The present invention is not limited to a display device that uses two dry batteries with a rated voltage of 1.5 V as power supply batteries, and the rated voltage of the dry batteries and the number of batteries used are arbitrary. One dry battery can also be used.
In the present invention, it is preferable that the end voltage, which is the lower limit operating voltage capable of driving the load with the maximum voltage drop in a repeatable manner, is set as the second set value. Since the end voltage varies depending on the type of appliance and its load, it is appropriately set according to the appliance to be used. Further, the first set value higher than the second set value is also set as appropriate in consideration of the general power consumption speed of the power supply battery by driving the load.
When the battery voltage is between the first set value and the second set value, the battery replacement indicator lamp may be turned on. In that case, when the battery voltage drops below the second set value and the load does not operate normally, the battery replacement indicator lamp is switched from lighting to blinking.
In the embodiment, an example is shown in which the display unit is configured by an operation display panel that can freely enter and leave the main body. However, the display unit is provided on the front surface of some instruments. Further, the display of the load operation error and the battery replacement error may be a simple symbol or a simple message format in addition to the combination of symbols.

  The display device of the present invention can be applied to all appliances that can control the load by a microcomputer with a control sensor using a dry battery as a power source, and in particular, a stove, a heating device, an instantaneous water heater, a hot water boiler, etc. The present invention can be suitably applied to a combustion appliance that uses gas or petroleum as fuel.

It is a perspective view of the gas stove which shows one Example of the display apparatus of this invention. It is the schematic of the gas circuit of the gas stove shown in FIG. It is a block diagram of the electric circuit of the gas stove shown in FIG. It is a flowchart explaining the control operation of the gas stove shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Gas stove, 6-8 ... Stove burner, 10 ... Grill burner, 6a-8a ... Pan bottom temperature sensor, 6b-8b, 10b ... Electromagnetic safety valve, 6c-8c, 10c・ ・ ・ Flow control motor operated valves, 6e to 8e, 101e, 102e ... Flame detection sensor, 13 ... Battery compartment, 14 ... Battery replacement indicator, 15 ... Display unit (operation display panel), 18 ... Main valve, 21 ... Control circuit, 22 ... Dry battery (power supply), 24 ... Battery voltage monitoring circuit, 25 ... Igniter, 27 ... Display circuit, 29a to 29d ... An ignition switch, 31a to 31d, a stepping motor, 32a to 32d, a drive position sensor, 33a, a holding winding, 33b, an adsorption winding, 36, an error display unit.

Claims (2)

  In a display device for an appliance that includes a dry battery, a battery voltage monitoring circuit that monitors the voltage of the dry battery, a battery replacement indicator lamp, and a display unit that displays an operation error of the load, and the load is driven using the dry battery as a power source. When the voltage is above the first set value, the battery replacement indicator is off, and when the battery voltage drops and is between the first set value and the lower second set value, When the battery replacement indicator flashes or lights up and the battery voltage is above the second set value, the control circuit determines that the load operation is abnormal based on a signal from a sensor provided in connection with the load. When the drive of the load is stopped, a load operation error is displayed on the display unit, and when the battery voltage further drops below the second set value, the load does not operate normally. Indication that the battery has reached the time for replacement Display, display device, characterized in that stops the driving of the load.   The load is a stepping motor used in a flow rate adjusting motor-operated valve that adjusts a fuel supply amount of a combustion appliance, and a sensor provided in association with the load is a driving position sensor that detects a driving position of the stepping motor. The display device according to claim 1.

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