JPH047205B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a jiyar rice cooker for general household use.

BACKGROUND TECHNOLOGY A conventional jar rice cooker employing a microcomputer (hereinafter referred to as a microcomputer) has no provision for handling a power outage other than a so-called instantaneous power outage during use.

Problems to be Solved by the Invention In such a conventional jar rice cooker, for example, if a power outage occurs during rice cooking, the microcomputer will be reset, and after the power is restored, it will return to its initial state, that is, nothing will work. As a result, there was a problem that the rice cooking was stopped midway and the rice could not be cooked.

Also, some rice cookers come with a clock.
This device has a backup battery or a large-capacity backup capacitor, but in this case, it is not only expensive but also has a very complicated structure.

Furthermore, the above problem also applies when the rice is being kept warm; if there is a power outage while the rice is being kept warm, the power to the heater will stop flowing after the power is restored, resulting in the rice becoming cold. .

The present invention has been made in order to solve these problems, and it is an object of the present invention to provide a jar rice cooker that has a simple configuration and is capable of continuing its previous operation even after a power outage occurs during use and is restored. The purpose is to

Means for Solving the Problems In order to solve the above problems, the present invention provides a state in which it is stored whether the rice is being cooked with a timer or the rice is being cooked (state A) or not (state B). A storage means, a temperature detection means for detecting the temperature of the object to be heated, and when the power supply during use is restored after a power outage, the rice cooking means is immediately activated in the state A before the power outage based on the outputs of the state storage means and the temperature detection means. In state B, if the temperature of the object to be heated is higher than a predetermined temperature, the heat retaining means performs the heat retaining operation, and if it is lower, the rice cooking operation and the heat retaining operation are not performed.

Effect The present invention has the above-described configuration, so that even if there is a power outage, the rice cooking operation is performed if the timer rice cooking or rice cooking operation is in progress before the power outage according to the output of the status storage means and the temperature detection means after the power is restored. On the other hand, if the device is in a warming operation or in standby mode, it can continue to operate as is.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a block diagram of a jar rice cooker according to an embodiment of the present invention. Reference numeral 1 denotes a timer setting means, which sets a timer time during timer rice cooking. 2 is a rice cooking switch for starting the rice cooking operation. 3 is a rice cooking means, and when the rice cooking switch 2 is pressed, the timer setting means 1 is activated.
If the timer time is set, the rice cooking operation will start after the predetermined time has elapsed, or immediately if the timer time has not been set. Reference numeral 4 denotes a heat-retaining means, which performs a heat-retaining operation after the rice cooking means 3 finishes the rice cooking operation.

Reference numeral 5 denotes a state storage means, and this state storage means 5 records whether the rice cooking operation is in progress or the timer rice cooking state is in progress (hereinafter referred to as state A) from when the rice cooking switch 2 is pressed until the rice cooking operation is completed. (hereinafter referred to as state B). Reference numeral 6 denotes a power failure recovery means, and this power failure recovery means 6 is used when there is a power failure and then the power is restored, the state storage means 5 is
According to the output, if the state is A, the rice cooking means 3 is immediately activated.
If the temperature of the heated object is higher than a predetermined temperature, the heat keeping means 4 executes the rice cooking operation, and if the temperature of the object to be heated is higher than a predetermined temperature, the rice cooking operation is performed. It waits without performing any operations.

FIG. 2 shows a specific circuit diagram of a jar rice cooker according to an embodiment of the present invention, in which 11 is an AC power supply, a series circuit of a rice-cooking relay contact 12 and a rice-cooking heater 13 is connected to both ends, and a heat-retaining relay contact 14 is shown. The series circuits of the heat-retaining heater 15 and the heat-retaining heater 15 are connected in parallel. Respective relay contacts 12 and 14 are connected to respective relay coils 17 and 1 according to the output of microcomputer (hereinafter referred to as microcomputer) 16.
It is turned on by 8.

The timer time is input to the microcomputer 16 by a variable resistor 19 and an A/D converter 20. 21 is a rice cooking switch.

22 is a capacitor, and this capacitor 22 is charged via a resistor 23 and a diode 24 or discharged via a resistor 25 and a transistor 26 depending on the outputs of ports _PA and _PB of the microcomputer 16. The potential of this capacitor 22 is determined by a reference potential determined by resistors 27 and 28 and a comparator 29.
The comparison output is then input to the microcomputer 16. Furthermore, the divided potentials of the thermistor 30 and resistor 31 are also input to the microcomputer 16 via the A/D converter 32.

Next, the operation of the above circuit will be explained. Until the rice cooking switch 21 is pressed and the timer rice cooking or rice cooking operation is in progress, the port P _A of the microcomputer 16 is set to "L", the port P _B is set to "H", and the capacitor 2
2 is in a discharge state.

Once the rice cooking switch 21 is pressed, the port _PA of the microcomputer 16 becomes "H" and the port P _B becomes "L", and the capacitor 22 is charged via the resistor 23 and diode 24.

Here, assume that a power outage occurs during rice cooking or timer rice cooking. Microcontroller 1 during power outage
Since both P _A and P _B of port No. 6 are "L", the charge of the capacitor 22 is maintained without being discharged. When the power is restored, microcontroller 1
6 immediately receives the output of the comparator 29, determines that rice cooking was in progress or timer cooking was in progress before the power outage, immediately drives the rice cooking relay coil 17, closes the rice cooking relay contact 12, and connects the rice cooking heater 13 to the rice cooking heater 13. Turn on the power and start cooking rice.

In addition, even if a power outage occurs during timer cooking, rice will be cooked immediately after the power is restored, but after rice is cooked, the microcomputer 16 will immediately energize the warming heater 15 to keep it warm, so the user can actually choose the desired length of time. There is no inconvenience as you can eat rice that has been cooked for a long time.

Furthermore, if a power outage occurs during warming or standby, the capacitor 22 is in a discharged state, and after the power is restored, the microcomputer 16 takes in the output of the comparator 29 and determines that it was in warming mode or on standby before the power outage. Next, the output of the A/D converter 32 is taken in, and if the temperature of the thermistor 30 is higher than a predetermined value, the heat-retaining relay coil 18 is driven, the heat-retaining relay contact 14 is closed, and the heat-retaining heater 16 is energized;
Resumes warming operation. On the other hand, if the temperature of the thermistor 30 is lower than a predetermined value, the rice cooking heater 13 or the heat-retaining heater 15 is not energized while on standby.

Effects of the Invention As described above, according to the present invention, even if a power outage occurs while the jar rice cooker is in use, the rice cooking, warming, and standby operations can be continued correctly after the power is restored using an extremely simple circuit configuration. It is possible. Also, if a power outage occurs during timer cooking,
Since the rice cooking operation is performed after the power is restored, and the warming operation is performed after the rice is cooked, the cooked rice can be eaten at the time set by the user, and even if there is a power outage, the rice can be cooked reliably.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a jar rice cooker showing one embodiment of the present invention, and FIG. 2 is a specific circuit diagram of the same rice cooker. 1...Timer setting means, 2...Rice cooking switch, 3...Rice cooking means, 4...Warming means, 5...State storage means, 6...Power failure recovery means, 7...Temperature detection means.

Claims (1)

[Claims] 1. A timer setting means for setting a timer time, a rice cooking switch for starting the rice cooking operation, and when the timer time is set by the timer setting means when the rice cooking switch is pressed, the timer time is set after a predetermined time has elapsed. If not, the rice cooker has a rice cooking means that immediately performs the rice cooking operation and a heat retention means that performs the warming operation after cooking the rice, and the state after the rice cooking switch is pressed until the rice cooking operation ends (state A). a state storage means for storing whether the object is in the state (status B); a temperature detection means for detecting the temperature of the heated object; Depending on the output, if the state is A before the power outage, the rice cooking means immediately performs the rice cooking operation, and in the state B, if the temperature of the object to be heated is higher than a predetermined temperature, the heat retention means performs the heat retention operation, and if it is lower, the rice is cooked.・A jar rice cooker with an additional means for recovering from a power outage that does not perform a warming operation.