JPS6216727A - Jar rice cooker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

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

BACKGROUND OF THE INVENTION Conventional jar rice cookers employing microcomputers (hereinafter referred to as microcomputers) have been equipped with a process for dealing with power outages other than instantaneous power outages during use.

Problems to be Solved by the Invention In such conventional jar rice cookers, for example, if a power outage occurs during rice cooking, the microcomputer is reset, so after the power is restored, it returns to its initial state, i.e., no operation. 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, which has a backup battery, a large capacity backup amplifier capacitor, but this can be costly. The structure was also extremely complex.

The above problem also applies when the heat retention function is in progress.
If there was a power outage while the rice was being kept warm, the power to the heater would stop supplying power after the power was restored, causing the rice to become cold and tasteless.

The present invention has been made to solve these problems, and provides a jar rice cooker with a simple configuration that allows fortune-telling by continuing the 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 method for determining whether the timer is in the middle of rice cooking or in the rice cooking operation (state A).
a state storage means for storing the temperature of the heated object (state B); and a temperature detection means for detecting the temperature of the object to be heated; In state A, the rice cooking means immediately performs the rice cooking operation, and in state B, if the temperature of the object to be heated is higher than a predetermined temperature, the heating means performs the warming operation,
If the temperature is low, a power failure recovery means is added that does not perform both rice cooking and warming operations.

Effect The present invention has the above-described configuration, so that even if there is a power outage, after the power is restored, according to the outputs of the state storage means and the temperature detection means,
If the rice cooker is in the timer cooking mode or in the rice cooking mode before the power outage, it can be made to cook rice, and if it is in the warming mode or on standby without doing anything, it can continue to operate until that point. .

Embodiment Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings. FIG. 1 shows a block diagram of a jar rice cooker according to an embodiment of the present invention, where 1 is a timer setting means;
When cooking rice with a timer, set the timer time. 2 is a rice cooking switch for starting the rice cooking operation. 3 is a rice cooking means which, when the rice cooking switch 2 is pressed, starts the rice cooking operation after a predetermined time has elapsed if the timer time is set by the timer setting means 66-1, or immediately if the timer time has not been set.

4 is a heat retention means, after the rice cooking means 3 finishes the rice cooking operation,
Performs warming operation.

5 is a state storage means, and this state storage means 5 stores the state from when the rice cooking switch 2 is pressed until the end of the rice cooking operation, that is, the rice cooking operation or the timer rice cooking operation (hereinafter, state A).
(hereinafter referred to as state B). Reference numeral 6 denotes a power failure recovery means, and when there is a power failure during use, the power failure recovery means 6 causes the rice cooking means 3 to immediately execute the rice cooking operation according to the output of the state storage means 5 when the power is restored. , if the state is B, the temperature of the object to be heated is detected by the output of the temperature detection means 7, and if the temperature is higher than a predetermined temperature, the heat retention means 4 executes the heat retention operation;
If the temperature is low, the rice cooker is on standby without cooking or keeping the rice warm.

FIG. 2 shows a specific circuit diagram of a jar rice cooker according to an embodiment of the present invention, in which reference numeral 11 is an AC power supply, and a series circuit of a rice cooking relay contact 12 and a rice cooking heater 66 to 13 at both ends, and a heat insulation The series circuits of the relay contact 14 and the heat-retaining heater 15 are connected in parallel. Respective relay contacts 12 , 14 are turned on by respective relay coils 17 and 18 in response to the output of microcomputer (hereinafter referred to as microcomputer) 16 .

The timer time is input to the microcomputer 16 by the variable resistor 19 and the A/D converter 2°. 21 is a rice cooking switch.

22 is a capacitor, and this capacitor 22 is connected to the microcomputer 1.
Depending on the outputs of ports PA and PB of 6, the battery is charged via a resistor 23 and a diode 24, or discharged via a resistor 25 and a transistor 26. The potential of this capacitor 22 is compared with a reference potential determined by resistors 27 and 28 by a comparator 29, and is outputted and 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. The port PA of the microcomputer 16 is I L II until the rice cooking switch 7 base 2 21 is pressed and the timer rice cooking mode or rice cooking operation is activated.

PB is set to H', and the capacitor 22 is in a discharged state.

Once the rice cooking switch 21 is pressed, the output signal PA of the microcomputer 16 becomes 'H' and PB 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 during timer rice cooking. During a power outage, the port of the microcontroller 16 is
Since both PA and PB reach "L", the charge in the capacitor 22 is maintained without being discharged. When the power is restored, the microcomputer 16 immediately receives the output of the comparator 29, determines that rice was in operation or timer cooking was in progress before the power outage, and immediately drives the rice-cooking relay coil 17 and contacts the rice-cooking relay. Close 12 and turn on rice cooking heater 13
energizes and starts cooking rice.

In addition, even if a power outage occurs during timer cooking, the rice will be cooked immediately after the power is restored, but after the rice is cooked, the microcomputer 16 will immediately energize the warming heater 15 and start the warming operation.
In fact, the user can eat the cooked rice at the desired time, so there is no inconvenience at all.

Also, 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 a warming operation or on standby before the power outage, and then the A/D converter 3
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 to restart the heat-retaining 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 warming heater 15 is fully energized while on standby.

Effects of the Invention As described above, according to the present invention, even in the event of a power outage while using a jar rice cooker, the rice cooking, warming, and standby operations (page 9) can be continued correctly after the power is restored using an extremely simple circuit configuration. It is something that can be done.

[Brief explanation of the drawing]

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... Marked rice cooking switch, 3... Rice cooking means, 4... Heat retention means,
5... Status storage means, 6... Power failure recovery means, 7... Temperature detection means. Name of agent: Patent attorney Toshio Nakao (1st person)
figure

Claims (1)

[Claims] a timer setting means for setting a timer time; a rice cooking switch for starting a rice cooking operation; and a rice cooking switch for starting a 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 is in a state (state A) after the rice cooking switch is pressed until the rice cooking operation is completed. a state storage means for storing whether the object is present or not (state B); a temperature detection means for detecting the temperature of the object to be heated; and an output from the state storage means and the temperature detection means when the power supply is restored after a power outage during use. Therefore, before the power outage, state A
In this case, immediately perform the rice cooking operation using the rice cooking means,
In state B, if the temperature of the object to be heated is higher than the predetermined temperature, the heat retaining means performs the heat retaining operation, and if it is lower than the predetermined temperature, the heating operation is performed.
A jar rice cooker that is equipped with a means for recovering from a power outage that does not perform a warming operation.