JPH10257968A - Electric pot - Google Patents

Abstract

PROBLEM TO BE SOLVED: To entirely sweep away the inconvenience with an existing backup power supply, and also operate without hindrance an electric pot after the reset of power failure, on the basis of variour kinds of information before power failure. SOLUTION: During electrification, various kinds of information are written in a non-volatile storing means 21. After the reset of power failure, the various kinds of information are transferred from the non-volatile storing means 21 to a RAM 4. Thereby, water-boiling action and heat-insulating action can be carried out in the same insulation setting condition as before the power failure. Since the non-volatile storing means 21 is made up of an EEPROM, the circuit is simple and the cost reduction can be achieved. Further, since the EEPROM is made up of semi-conducter elements, the electric pot has high reliability and is easy to use.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric pot that stores various information necessary for performing a water heater operation and a heat retaining operation, and restarts the operation based on the stored various information after recovery from a power failure.

[0002]

Generally, an electric pot of this kind is provided with a heater for boiling water by controlling the power supply through a heating means such as a water heater based on information from a temperature detecting means for detecting the temperature of the hot water. Water heater operation to heat to the state,
A heat retaining operation for maintaining the hot water at a temperature lower than the boiling temperature is performed by the control means constituting the microcomputer.

[0003] Among such electric pots, there are known electric pots in which a plurality of heat retaining temperatures can be selected and set. However, once a power outage occurs, all the set insulation temperatures are erased,
Since it returned to the initial state, it was necessary to set the heat retention temperature again. In addition, in an electric pot that sets the heat retention temperature after boiling based on the boiling water temperature, there is a possibility that the set heat retention temperature may change for each water heater due to the boiling water temperature, but until a power failure occurs, Since the set heat retention temperature is deleted, if the heat retention operation is performed immediately after the recovery from the power failure, a predetermined heat retention temperature will be set since it has not passed through the boiling state, and the conditions different from those before the power failure will be set. Insulation was inconvenient. Further, when a power failure occurs, the operating state information of the water heater or the heat retention is erased, so that the operation state before the power failure cannot be continued after the power failure is recovered. For this reason, after the recovery from the power failure, for example, it is determined whether the water heating operation is always performed and then the heat retention operation is performed or the heat retention operation is performed based on the hot water temperature at the time of the recovery from the power failure. The operation is performed, and when the temperature of the hot water is high, the warming operation is performed), which is inconvenient, and the necessary operations such as during the water heating or during the timer cannot be continued after the recovery from the power failure.

[0004] In order to solve the above-mentioned problem, in order to prevent necessary information from being erased even when a power failure occurs, a NiCd (NiCd) is required.
-Cd) A method of backing up a microcomputer serving as control means by a backup power supply composed of a secondary battery such as a battery, or storing various information by using a charge / discharge function of a capacitor is known. . However, not only was the cost high and the circuit became complicated, but also problems such as a short life and a narrow operating temperature range occurred.

[0005] The present invention is intended to solve such problems, and eliminates the problems of the existing backup power supply, and based on various kinds of information before the power failure, performs a water heating operation and a heat retention operation after the recovery from the power failure. It is an object of the present invention to provide an electric pot that can be operated without any trouble.

[0006]

An electric pot according to the present invention comprises:
In order to achieve the above-mentioned object, control program storage means storing a control program necessary for performing a water heating operation and a heat keeping operation executed by the control means, and a control program storage means used as a work area during operation processing of the control program. And a non-volatile storage unit configured by an EEPROM. The control unit stores information stored in the control program storage unit or the work storage unit when the power is supplied to the non-volatile storage unit. Transfer and store in the means,
The information stored in the non-volatile storage means is transferred to the work storage means when power is restored.

According to the above configuration, various information stored in the control program storage means and the work storage means are written into the non-volatile storage means during energization, and various information stored and held in the non-volatile storage means even during a power failure. Since the information is transferred to the work storage unit after the power failure is restored, the water heating operation and the heat retaining operation can be performed after the power failure restoration under the same conditions as before the power failure. In addition, since the nonvolatile storage means for storing such information even during a power failure uses an EEPROM, the nonvolatile storage means is compared with an existing backup power supply such as a battery or a capacitor.
The circuit is simple and the cost can be reduced. And EEPR
Since the OM is composed of a semiconductor element, it is not necessary to consider the temperature, the life, etc., and the OM is highly reliable and easy to use.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the electric pot of the present invention will be described below with reference to FIGS.
In FIG. 1, which shows the electric configuration of the electric pot, reference numeral 1 denotes a microcomputer mounted on a control board (not shown) or the like, which is, as is well known, a central device provided with a control device and an arithmetic logic device. Control means 2 corresponding to the processing device
ROM (Read Only Memory)
3 and a writable volatile memory RAM (Rand
om Access Memory) 4 and the like. The microcomputer 1 also includes a temperature input means 5 and each input means 6 and 7 connected to an input port of the control means 2 and output devices 8 and 7 connected to an output port of the control means 2. It has 9 and 10.

ROM corresponding to control program storage means
Reference numeral 3 denotes a fixed control program necessary for performing various operations such as a water heater operation and a heat retaining operation, including various types of information in an initial state. The control program is executed by the control means 2. , A series of operations of the electric pot are performed. The RAM 4 corresponding to the work storage means is used and stored as a work area at any time during the operation processing of the control program by the control means 2. The control means 2 appropriately selects various types of information in the initial state stored in the ROM 3 or various types of information stored in the RAM 4, executes the control program, and performs a water heating operation and a warming operation. The various types of information referred to here include, for example, temperature information of the temperature detecting means 11 for detecting the temperature of the hot water in the container (not shown), setting information of the heat retaining temperature selected by the heat retaining setting means 12, and water heating. The information includes setting information of the water heater mode or descaling mode set by the selection means 13.

Reference numeral 21 denotes an EEPROM (Electrically Erasa
ble Programmable Read Only Memory). This non-volatile storage means 21 stores the ROM 3 or RA when power is supplied during a water heater operation or a heat retention operation.
Various information stored in M4 is transferred and stored in accordance with an instruction from the control unit 2. The various information stored in the non-volatile storage means 21 is retained as it is at the time of the power failure, and when the power is restored, the various information stored in the non-volatile storage means 21 is transferred to the RAM 4 and transferred to the RAM 4 The control means 2 is configured to perform a water heater operation and a heat retention operation based on the various information thus obtained. In the present embodiment, setting information of the heat retention temperature selected and set from a plurality of types of heat retention temperatures by the above-described heat retention setting means 12, setting information of the heat retention temperature set based on the boiling water temperature in the water heater operation, and water heating The operation state information of the electric pot indicating whether the operation is the operation or the heat retention operation is stored in the nonvolatile storage unit 21.

The control means 2 receives temperature information from the temperature detection means 11 via the temperature input means 5 and receives an operation signal from the heat retention setting means 12 for switching the setting of the heat retention temperature, and an operation signal from the water heater. Operation signals from the water heater selection means 13 for switching the mode setting in are input through the input means 6 and 7, respectively. In the present embodiment, by operating the heat retention setting means 12, a 98 temperature retention setting as a high temperature retention setting for setting the hot water temperature to a high temperature around 98 ° C. and a hot water temperature of 60 ° C.
Two types can be selected: a low-temperature heat setting for setting a low temperature in the vicinity, and a heat-retention setting of 60.

An output side of the control means 2 is connected to the output means 8 and is connected to the electric heater 23 for supplying electric power to the electric heater 22, and is connected to the output means 9 and is connected to the electric heater 9. Heating heater energizing means 25 for supplying electricity are connected to each other. Among them, the water heater 22 corresponds to a water heater that heats the water in the container during the water heating operation, and the warming heater 24 keeps the water in the container at a predetermined temperature during the warming operation. It corresponds to a means. Also, 26
Is a display means such as an LED or an LCD connected to the output means 10, which is turned on at the time of the above-mentioned 98 heat retention setting.
Heat insulation lamp 27 and 60 heat insulation lamps that light up when 60 heat insulation is set
28, and a boiling lamp 29 which is lit during the water heater operation.

FIG. 2 is a block diagram showing a functional configuration of the microcomputer 1 particularly relating to boiling detection.
In the figure, reference numeral 31 denotes capacity detecting means for detecting the capacity of hot water stored in the container. In the present embodiment, the capacity detecting means 31 detects the temperature based on the rate of increase of the hot water temperature in a predetermined temperature range during the boiling operation. Therefore, based on the temperature information from the temperature detecting means 11, the capacity of the container detecting means 31 is detected. 32 is a temperature comparing means for comparing whether the hot water temperature based on the temperature information from the temperature detecting means 11 has reached a predetermined temperature lower than a boiling point set in accordance with the capacity detection of the container detecting means 31. It is. When the temperature comparing means 32 detects that the hot water temperature has reached the predetermined temperature, the time counting means 33 is configured to start time counting from that time. The capacitance detection performed by the capacitance detecting means 31 is performed within a predetermined temperature range lower than the predetermined temperature.

The temperature comparing means 32 and the time measuring means 33 constitute a boiling detecting means 34 for detecting boiling in the container. Boiling detection means 34, after detecting that the temperature of the hot water in the container has reached a predetermined temperature according to the capacity lower than the boiling point by temperature comparison means 32, starts time measurement by time measurement means 33, and according to the capacity. After a lapse of a predetermined time, the timer has a function of stopping the time measurement by the timer means 33 and stopping the energization of the water heater 22 as the water heater. However, this is the case of the normal operation mode, and the water heater selection means 13
In the above, if the descaling operation mode for removing the desalted component by continuing the boiling after the boiling detection is selected, even after the predetermined time elapses by the time measuring means 33, the capacity detected by the capacity detecting means 31 Regardless, the energization of the heater 22 is continued for a certain period of time, and thereafter, the energization of the heater 22 is stopped. In the present embodiment, when the electric heater 22 and the warming heater 24 are energized at the same time during the electric water heating operation, and the boiling detecting means 34 stops energizing the electric heater 22,
The heat retention heater 24 is also configured to temporarily stop energization.

Next, the operation of the above configuration will be described with reference to the flowcharts shown in FIGS. In addition,
The EEPROM described in each figure includes a nonvolatile storage unit 21.
Means First, based on the flowchart of FIG.
To explain the operation of changing the heat retention setting during the heat retention operation,
During the warming operation, the warming operation is performed according to one of the previously selected 98 warming setting or 60 warming setting. That is, when the 98 heat retention setting is selected, an operation of keeping the hot water temperature at around 98 ° C. is performed, and the 98 heat retention lamp 27 of the display means 26 corresponding thereto is turned on (step S1). When the 60 heat retention setting is selected, an operation of keeping the hot water temperature at 60 ° C. is performed, and the corresponding 60 heat retention lamp 28 of the display means 26 is turned on (step S2). In any of the heat keeping operations, the control means 2 controls the power cutoff of the heat keeping heater 24 via the heat keeping heater energizing means 25 based on the temperature information from the temperature detecting means 11, and checks whether the heat keeping setting means 12 has been operated. Input means 7
(Step S3)
S4). Then, the procedure of step S1 or step S2 is continued unless any operation is performed on the heat retention setting means 12.

On the other hand, when the heat retention setting means 12 is operated while the operation of 98 heat retention is being performed, the next step S5
And the control means 2 replaces the previous 98 heat insulation setting.
In order to indicate that the 60 heat retention setting has been selected, the 60 heat retention lamp 28 flashes. The operation of this step S5 continues for 2 seconds (step S6), but in the next step S7, if no operation is performed on the heat retaining setting means 12 during this time, the step S5 is executed.
The procedure goes out of steps S5 and S6 to determine the heat insulation setting of 60. In the next step S8, information indicating that the heat insulation setting is 60 is stored in the ROM.
3 or from the RAM 4 to the nonvolatile storage means 21 for writing. After that, the process proceeds to step S2,
24, the operation of keeping the hot water temperature at 60 ° C. by controlling the power cutoff, and the corresponding 60-insulation lamp of the display means 26
28 is switched from the blinking state to the lighting state.

In step S4, when the heat retention setting means 12 is operated while the operation of 60 heat retention setting is being performed, the process shifts to the next step S9, and the control means 2 replaces the previous 60 heat retention setting. The 98 heat keeping lamp 27 is blinked to indicate that the 98 heat keeping setting has been selected. The operation in step S9 continues for 2 seconds (step S9).
10) In the next step S11, if no operation is performed on the heat retention setting means 12 during this time, the procedure exits the steps S10 and S11 to determine the 98 heat retention setting, and in the next step S12, the 98 heat retention setting is made. The information to the effect is transferred from the ROM 3 or the RAM 4 to the nonvolatile storage means 21 and written. Then, step S
The procedure proceeds to step 1, and the operation of keeping the hot water temperature at 98 ° C. is performed by controlling the cutoff of the warming heater 24 and the 98 warming lamp 27 of the display means 26 corresponding to this is turned from the blinking state to the lighting state. Switch.

Note that step S6 and step S6
During the operation for 2 seconds in 10, the heat insulation setting means 12 is provided in response to continuous operation of the heat insulation setting means 12, and the display shows the 98 heat insulation lamp 27 or 60 heat insulation lamp 28 of the changed heat insulation setting.
However, the power cutoff control of the heat retaining heater 24 performs the operation before the heat retaining setting means 12 is operated. And step S
In step 7, when the heat retention setting means 12 is operated again while the 60 heat retention lamp 28 is blinking, the process proceeds to step S9, and the 98 heat retention lamp 27 is blinked. In step S11, when the heat retention setting means 12 is operated again while the 98 heat retention lamp 27 is blinking, the procedure proceeds to step S9, and the 60 heat retention lamp 28 is blinked. In any case, when 2 seconds have elapsed since the 98 heat keeping lamp 27 or the 60 heat keeping lamp 28 is turned on and off, the selected heat keeping setting is determined, and writing and storing in the nonvolatile storage means 21 are performed.

FIG. 4 is a flowchart showing a procedure for changing the heat retention setting during the water heater operation.
In the figure, during the water heater operation, either the 98 heat retention setting or the 60 heat retention setting is set in advance. That is, when the 98 heat insulation setting is set, the 98 heat insulation lamp 27 of the display means 26 corresponding thereto flashes (step S21). In addition, when the heat retention setting of 60 is set, an operation of keeping the hot water temperature at 60 ° C. is performed, and the display means 26 corresponding to this operation is displayed.
The 60 heat keeping lamp 28 flashes (step S22). In any case, the boiling lamp 29 is lit during the water heating operation. Hereinafter, the operation of changing the heat retention setting in steps S3 to S12 is the same as that during the heat retention operation described in the flowchart of FIG. The same procedure is performed.

FIG. 5 is a flow chart showing the procedure for setting the heat retention temperature based on the boiling water temperature.
In the same drawing, during the kettle in step S31, the boiling lamp of the display means 26 is displayed to inform the user of this.
29 lights up. At the same time, both the water heater 22 and the warming heater 23 are energized to strongly heat the hot water in the container. Here, in the procedure of step S32, when the boiling detection means 34 detects boiling by a procedure described later, the control means 2 sets a heat retention temperature lower than the boiling water temperature detected by the temperature detection means 11, This value is temporarily stored in the RAM 4 (step S33). Thereafter, the control means 2 reads the heat retention temperature information stored in the non-volatile storage means 21 (step S34), and determines whether or not the read heat retention temperature is equal to the currently set heat retention temperature in the next step. The determination is made in S35. If the read heat retention temperature is different from the currently set heat retention temperature, the currently set heat retention temperature stored in the RAM 4 is written to the non-volatile storage means 21 (step S36), while the read heat retention temperature is read. If is equal to the currently set heat retention temperature, writing to the non-volatile storage means 21 is not performed, and the operation during boiling is continued in the procedure of the next step S37. In this way, when the predetermined water heating operation is completed (step S38), the process proceeds to step S39, where the currently set heat retention setting is displayed on the display means 26, and
In order to maintain the hot water temperature at the set thermal insulation temperature, the thermal insulation operation is performed while power is cut off through the thermal insulation heater 24. Only when the information to be written to the nonvolatile storage unit 21 this time is different from the information already stored in the nonvolatile storage unit 21 as in the above-described embodiment, the writing to the nonvolatile storage unit 21 is performed. As a result, the number of times of writing can be reduced, and the life of the EEPROM as the nonvolatile storage means 21 can be extended.

FIG. 6 is a flow chart showing a procedure for transferring data to the nonvolatile storage means 21 in the operating state, that is, during energization. In step S41 of FIG. 7, when the warming operation based on the warming setting 60 is performed, and at the same time the display during warming is performed by turning on the warming lamp 28, the hot water temperature detected by the temperature detecting means 11 For example, when the temperature drops to less than 60 ° C. due to water injection or the like (step S42), the heat retaining operation is automatically terminated, the water heater is started, and information indicating that the water is in the water heater is stored in the ROM 3 or RA.
The data is transferred from the M4 to the nonvolatile storage means 21 and written (steps S43, S44). During the water heating operation in step S44, the boiling lamp 29 is turned on instead of the 60 heat keeping lamp 28 to indicate that the water heating operation is being performed. Then, although omitted here, after a series of water heating operations is completed in step S45 through the above-described steps S31 to S37, the process proceeds to step S46 to perform the heat retaining operation based on the 60 heat retaining settings. In the ROM 3 or RAM 4
Is transferred to the non-volatile storage means 21 for writing. In this way, every time the water heater or the warming operation is performed, the current operation state is transferred to and stored in the nonvolatile storage means 21.

FIG. 7 is a flowchart showing an operation procedure at the time of recovery from a power failure. In the figure, when the control unit 2 detects the recovery from the power failure (step S51), in the next step S52, the non-volatile storage unit 21 executes the above-described procedures.
Is transferred (read) to the RAM 4 of the microcomputer 1. Thereafter, in step S53, the control means 2 determines the heat retention setting information read into the RAM 4, and if the heat retention setting information is 98 heat retention setting, the process proceeds to step S54, where the temperature detection means 12 detects the heat retention setting information. It is determined whether or not the hot water temperature is 90 ° C. or higher. If the temperature of the hot water is 90 ° C. or higher, it is determined that there is no need to perform water heating at the present time, and a heat retention operation based on the 98 heat retention setting is performed (step S55). And
The power cutoff control of the warming heater 24 is performed based on the warming temperature information read into the RAM 4 from the nonvolatile storage means 21. On the other hand, if the hot water temperature is lower than 90 ° C. in step S54, it is determined that it is necessary to perform water heating, and the water heating operation is performed in a state where the 98 heat retention setting is set (step S56). ).

If it is determined in step S53 that the heat-retention setting information is 60 heat-retention setting, the process proceeds to step S57, where another operation state information read into the RAM 4 is determined. Then, if the operation state information read immediately before the power failure read in step S57 is a water heater operation, the process proceeds to step S58, and the water heater operation is performed with the heat retention setting of 60 set. On the other hand, if the operation state information read immediately before the power failure read in step S57 is a warming operation, the process proceeds to step S59 to determine whether the hot water temperature detected by the temperature detecting means 12 is 60 ° C. or higher. Determine whether or not. If the temperature of the hot water is 60 ° C. or higher, it is determined that there is no need to perform water heating at this time, and a heat retaining operation based on the 60 heat retaining setting is performed (step S60). The power cutoff control of the heat retaining heater 24 is performed based on the heat retaining temperature information stored in the ROM 3. On the other hand, in step S59, the hot water temperature becomes 60
If the temperature is lower than ° C, it is determined that it is necessary to perform water heating, and the process proceeds to step S58 to perform the water heating operation with the heat retention setting of 60 being set.

As described above, in the electric pot of this embodiment, the latest set heat retention setting information is written in the non-volatile storage means 21 during energization, and is stored in the non-volatile storage means 21 even during a power failure. After the heat retention setting information is stored and retained, RA
Since the data is transferred to M4, the warming operation can be performed under the same warming setting as before the power failure without having to perform the warming setting again each time the power is restored. In addition, in the electric pot that sets the subsequent heat retention temperature based on the boiling water temperature, there is a possibility that the set heat retention temperature may change every time the water is heated due to the boiling water temperature, but after the power failure is restored, Even in the case where the heat retention operation is performed without passing through the boiling state, the latest heat retention temperature set before the power failure is stored in the nonvolatile storage means 21, so that it is possible to perform the heat retention under the same conditions as before the power failure. , The usability is improved. Further, in the present embodiment, the operating state before the power failure is written in the non-volatile storage means 21 and this operating state information is transferred to the RAM 4 after the power failure is recovered. Can also be continued. For example, even if a sudden power failure occurs during the water heating operation before boiling, the water heating operation can be continued under the same conditions after the power failure is recovered, and the water can be reliably boiled. It can be obtained and is easy to use.

Further, since the nonvolatile storage means 21 for storing these various information even during a power failure uses an EEPROM, the circuit is simpler and the cost is reduced as compared with an existing backup power supply such as a battery or a capacitor. Can also be planned. In addition, since the EEPROM is composed of semiconductor elements, it is not necessary to consider the temperature, the life, etc., and the EEPROM is highly reliable and easy to use.

That is, a ROM 3 which is a control program storage means for storing a control program necessary for performing a water heating operation and a heat retention operation executed by the control means 2,
A RAM 4 serving as a work storage means used and stored as a work area during the operation processing of the control program;
The control means 2 transfers information stored in the ROM 3 or the RAM 4 to the non-volatile storage means 21 when power is supplied, and stores the information in the non-volatile storage means 21 when power is restored. Information stored in the RA
Since it is configured to transfer the data to the M4, it is possible to eliminate the troubles of the existing backup power supply, and to perform the water heating and the heat retaining operation after the recovery from the power failure based on various information before the power failure.

The information stored in the non-volatile storage means 21 is not limited to the information disclosed in the present embodiment, but includes any information relating to the operation of the electric pot. For example, information on the timer time for setting the water heater start time,
Alternatively, error information at the time of failure may be stored in the nonvolatile storage unit 21. Further, in the embodiment, two types of heat retention setting information of 98 heat retention settings and 60 heat retention settings are shown,
Any number is acceptable. Furthermore, the setting condition of the heat retention temperature based on other conditions may be stored in the nonvolatile storage unit 21. FIG.
The operation procedure of each flowchart shown in FIG. 7 to FIG. 7 is merely an example, and the branch of the operation after the recovery from the power failure and the timing of storing various information in the nonvolatile storage unit 21 may be changed as appropriate. Specifically, the writing of the operation state into the nonvolatile storage unit 21 may be performed during the operation, not at the time when the operation starts. The setting of the heat retention temperature based on the hot water temperature at the time of boiling and the writing to the non-volatile storage means 21 may be performed after a certain time has elapsed after the detection of the boiling.

Next, each operation at the time of boiling detection in this embodiment will be described with reference to the flowchart of FIG. 8 and the graphs shown in FIGS. 9 to 12, the upper graph shows the relationship between the hot water temperature in the container and the time, and the solid line represents the actual hot water temperature (actual temperature).
The broken line indicates the hot water temperature (detected temperature) detected by the temperature detecting means 12. Further, the lower graph shows the state of power cutoff of the water heater 22.

In the flowchart of FIG. 8, when the water heater starts, the water heater 22 is turned on as described above (step S71), and the water in the container is strongly heated. During the energization of the water heater 22, the temperature of the water gradually rises as shown in the graph of FIG. Then, in step S72, the capacitance detecting means is set in a temperature range lower than the predetermined temperature T1.
31 detects the volume of hot water. In step S73, the temperature comparing means 32 determines that the hot water temperature is lower than the predetermined temperature T1 lower than the boiling point T0.
Is detected, the boiling detecting means 33 temporarily clears a counter built in the time measuring means 33 to zero, and starts time counting therefrom (steps S74 and S75). When the normal operation mode is selected by the water heater selecting means 13, after the predetermined time t1 has elapsed, it is determined that the state of boiling has been reached (steps S76 and S77), and the energization of the water heater 22 is turned on. The operation is stopped (step S81). The predetermined temperature T1 and the predetermined time t1 are variably set in accordance with the capacity of hot water detected by the capacity detection means 31.

FIG. 10 is a graph when the volume of hot water in the container is small, and FIG. 11 is a graph when the volume of hot water in the container is large. In any case, the temperature detected by the temperature detecting means 12 rises later than the actual temperature. At the time of the small capacity shown in FIG. 10, the difference between the actual temperature and the detected temperature is large, and the actual temperature rises quickly, and the boiling point T0 = 10 earlier than the detected temperature.
Reach 0 ° C. On the other hand, at the time of the large capacity shown in FIG. 11, the difference between the actual temperature and the detected temperature is small, and the actual temperature becomes the boiling point T0 = 100.
When the temperature reaches ° C, the detected temperature immediately reaches the boiling point T0. Therefore, utilizing the relationship between the actual temperature and the detected temperature according to the capacity, in the present embodiment, when the capacity of the hot water in the container is small, the detected temperature of the temperature detecting means 12 is T1 = 92. When the time measured by the time measuring means 33 elapses for t1 = 20 seconds after the temperature reaches ° C, the energization of the heater 22 is stopped. On the other hand, when the volume of hot water in the container is large, after the temperature detected by the temperature detecting means 12 reaches 97 ° C., the time measured by the time measuring means 33 is t1.
= After elapse of 40 seconds, the energization of the water heater 22 is stopped. That is, in the case of a small capacity, the predetermined temperature T1 at which the determination of the boiling detection is started is set low, and the predetermined time t1 measured by the timer 33 is set short. On the other hand, in the case of a large capacity, the predetermined temperature T1 at which the determination of the boiling detection is started is set high, and the predetermined time t1 measured by the timer 33 is set.
Set longer.

As a result, when the capacity is small, the predetermined temperature T
1 is set low, the actual temperature is substantially equal to the boiling point T when the temperature detected by the temperature detecting means 12 reaches the predetermined temperature T1.
Since the temperature has risen to nearly 0, the hot water in the container has sufficiently reached the boiling point T0 after a short predetermined time t1 has elapsed.
On the other hand, in the case of a large capacity, even when the predetermined temperature T1 is set high, when the temperature detected by the temperature detecting means 12 reaches the predetermined temperature T1, the actual temperature does not reach the boiling point T0, and the temperature rises. Is also moderate. Therefore, the predetermined time t1
Is set to be long, the hot water in the container can be raised to the boiling point T0.

In this embodiment, if the descaling operation mode is selected by the water heater setting means 13 in step S77, the boiling detection means 34 clears the counter of the time counting means 33 to zero again (step S78). Then, timing is started therefrom (step S79). Then, as shown in FIG. 12, when a predetermined time t3 that does not correspond to the volume of the hot water in the container elapses (step S80) while the hot water heater 22 is energized, the descaling operation is completed, and the hot water heater 22 is turned off.
Stop the energization.

By the way, conventionally, in order to detect boiling of hot water, a rate of rise of hot water temperature detected by temperature detecting means is measured,
When the rate of rise becomes less than a certain value, the boiling is detected. However, when detecting the difference in the rate of rise before and after the inflection point at which the hot water temperature reaches the boiling point, the time from boiling to detection of the difference becomes long. In particular, when the volume of hot water in the container is large, the rate of temperature rise up to the boiling point is slow, the temperature difference at the time of boiling detection is small, and the detection time has to be set long. Further, in the case of detecting boiling regardless of the capacity, the boiling is surely detected in accordance with the detection time when the volume of hot water in the container is large. However, when the amount of hot water in the container is small, the temperature rise rate before boiling is large, and the boiling reaches the boiling point faster than in the case of large capacity. Had a problem that occurred in

On the other hand, in the case of detecting the boiling when the hot water in the container has reached a predetermined temperature, if the judgment temperature is set to a high value (for example, 100 ° C., which is the boiling point at a point of 1 atm), the atmospheric pressure is reduced. In a low place, the boiling point is lower than this, and until then the hot water temperature does not reach the determination temperature, and there is a problem that boiling detection cannot be performed. Conversely, if the determination temperature is lowered, the hot water may not be boiling this time when the boiling is detected. Such a problem also occurs due to variations in the temperature detecting means.

Therefore, in the present embodiment, for the purpose of reliably detecting boiling regardless of the amount of hot water, and for the purpose of minimizing the generation of steam at the time of boiling, the hot water in the container is heated at the time of hot water heating. A water heater 22 as a means, and a temperature detecting means for detecting the temperature of the hot water in the container.
12 and capacity detecting means 31 for detecting the volume of hot water in the container
A temperature comparing means 32 for comparing whether or not the hot water temperature has reached a predetermined temperature T1 lower than the boiling point;
Timer means 33 for measuring a predetermined time t1 after reaching
When the time counting means 33 measures the time of the predetermined time t1,
Boiling detection means 34 for stopping the energization of the water heater 22
The temperature comparing means 32 sets the predetermined temperature T1 to be higher as the capacity of the hot water detected by the container detecting means 31 is larger, and the time keeping means 33 controls the temperature of the hot water detected by the container detecting means 31. The predetermined time t1 is set longer as the capacity is larger.

With this configuration, the boiling duration time t2 between the time when the generation of steam is intense, that is, in FIG. 10 and FIG. It can be shortened regardless of the volume of hot water in the container. For this reason, generation of intense steam is reduced, and the total amount of generated steam is also reduced,
The steam can reduce external dew condensation and the amount of hot water lost by the steam. In particular, in the case of a small capacity, the rate of temperature rise of the hot water until boiling is large, and when the boiling point is reached, steam is generated intensely. In this embodiment, however, the predetermined temperature T1 at which the determination of the boiling detection starts is determined. ,
Since the time t1 until the energization of the water heater 22 is stopped can be varied depending on the capacity, such problems can be eliminated. Furthermore, since the duration time t2 of the boiling state can be shortened, the internal pressure of the container can be suppressed, and at the same time, the blowing and protrusion of the hot water from the steam port and the discharge port can be reduced, and the hot water can be prevented from being blown when falling. Is also obtained.

Further, since a series of boiling detections is performed only by the detected temperature from the temperature detecting means 11, the internal structure of the main body and the input can be compared with those provided with other detecting means such as a steam sensor. It is possible to simplify the circuit,
It is also possible to reduce costs.

Further, the above configuration further includes a water heater selection means 13 as a selection means for selecting a descaling operation mode for removing the desalted component by continuing boiling after the detection of boiling, and the descaling operation mode is set by the water heater selection means 13. When the selection is made, after the predetermined time t1 has elapsed, the water heater 22 is further energized for a predetermined time t3 not depending on the capacity of the hot water, and after the elapse of the predetermined time t3, the boiling detection is performed so as to stop the energization of the heater 22 The means 34 is constituted. In this way, a sufficient descaling effect can be obtained by securing the boiling state for a certain time t3, and the boiling duration time t2 can be shortened as much as possible, thereby suppressing the generation of unnecessary steam. Become.

It should be noted that the present invention is not limited to the above embodiment, and various modifications can be made.

[0040]

The electric pot of the present invention comprises a control program storing means for storing a control program necessary for performing a water heating operation and a heat retaining operation executed by the control means, and a work program during operation processing of the control program. A working storage unit that is used and stored as an area; and a nonvolatile storage unit that is configured by an EEPROM. The control unit stores information stored in the control program storage unit or the working storage unit when energized. The non-volatile storage means transfers and stores the information stored in the non-volatile storage means to the working storage means at the time of recovery from power failure. And based on various information before the power outage,
It becomes possible to perform the water heating operation and the heat retention operation after the power failure recovery without any trouble.

[Brief description of the drawings]

FIG. 1 is a circuit configuration diagram of an electric pot showing one embodiment of the present invention.

FIG. 2 is a block diagram showing a functional configuration of the microcomputer.

FIG. 3 is a flowchart showing a procedure for changing a heat retention setting during the heat retention operation.

FIG. 4 is a flowchart showing a procedure for changing a heat retention setting during the water heating operation;

FIG. 5 is a flowchart showing an operation procedure for setting a heat retention temperature based on the hot water temperature in the boiling state.

FIG. 6 is a flowchart showing a procedure for transferring and writing data to a nonvolatile storage means when the power is supplied;

FIG. 7 is a flowchart showing an operation procedure at the time of recovery from the power failure.

FIG. 8 is a flowchart showing an operation procedure when detecting boiling.

FIG. 9 is a graph showing a change in the detected temperature of the temperature detecting means at the time of water heating and the timing of turning off / on the power of the water heater.

FIG. 10 is a graph showing changes in the actual hot water temperature and the temperature detected by the temperature detecting means when the small-capacity water heater is used, and the power cutoff timing of the hot water heater.

FIG. 11 is a graph showing changes in the actual hot water temperature and the temperature detected by the temperature detecting means when the large-capacity water heater is used, and the power cutoff timing of the hot water heater.

FIG. 12 is a graph showing a change in the temperature detected by the temperature detecting means at the time of water heating and a power-off timing of the water heater when the descaling operation mode is selected.

[Explanation of symbols]

 2 control means 3 ROM (control program storage means) 4 RAM (work storage means) 21 non-volatile storage means

Claims (1)

[Claims] 1. A control program storage means for storing a control program necessary for performing a water heating operation and a heat retention operation executed by the control means, and used and stored as a work area during operation processing of the control program. A work storage means; and a non-volatile storage means constituted by an EEPROM, wherein the control means transfers information stored in the control program storage means or the work storage means to the non-volatile storage means when energized. An electric pot for storing and transferring information stored in said non-volatile storage means to said work storage means upon recovery from power failure.