JPH0546207B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a microcomputer-controlled electronically controlled rice cooker for use in general households.

Prior Art In conventional rice cookers that do not have a timer, the user cooks rice using a separate commercially available external timer.

In addition, recent microcomputer-controlled rice cookers are configured to input the start of rice cooking using a small non-locking switch called a tact switch, giving the user a soft feeling of use and a sense of luxury. ing.

Problems to be Solved by the Invention Even if a conventional microcomputer-controlled rice cooker without a timer is devised and planned, if AC power is not supplied to the rice cooker (i.e., if the rice cooker is not plugged into an outlet) (or until another external timer is turned on as mentioned above), the microcomputer does not work, so even if you try to use another external timer to cook rice using a timer, it will not work. There was a problem.

An object of the present invention is to provide an electronically controlled rice cooker that solves the above-mentioned conventional problems.

Means for Solving the Problems In order to solve the above problems, the rice cooker of the present invention includes a rice cooking switch for starting the rice cooking operation, and a delay means for delaying the output of the rice cooking switch for a certain period of time. , a capacitor for storing the timer rice cooking state, a charging means for charging the capacitor as soon as the rice cooking switch is pressed, a capacitor voltage detection means for detecting the voltage between the terminals of the capacitor, and the With the output of the delay means as input, the output of the capacitor voltage detection means indicates that the capacitor is charged at a predetermined voltage or higher after a certain period of time after the rice cooking switch is pressed or when AC power is applied. The structure includes a rice cooking means that performs a rice cooking operation when the rice is cooked.

Effect According to the above configuration, if the capacitor is charged by the rice cooking switch, even if the user uses another external timer, the rice will be cooked immediately when the timer is turned on, so the so-called timer rice cooking will not be possible. can do. The delay means was provided because if the rice cooking operation starts immediately after the rice cooking switch is pressed, the rice cooking operation will start immediately even if you want to use the timer cooking method. The rice cooker then moves on to the rice cooking operation.

Embodiment Hereinafter, an embodiment of the present invention will be described based on FIGS. 1 and 2.

FIG. 1 is a circuit block diagram of a rice cooker according to an embodiment of the present invention. Reference numeral 1 indicates a rice cooking switch, which starts rice cooking operation or timer rice cooking. 2 is a delay means which delays the output of the rice cooking switch 1 by a certain period of time and outputs the same. During normal rice cooking, the output of the rice cooking switch 1 is outputted via the delay means 2, and the start of rice cooking is slightly delayed, but the aforementioned delay time is at most several tens of seconds, and there is no problem in practical use. 3 is a charging means, which charges the capacitor 4 as soon as the rice cooking switch 1 is pressed. 5 is a capacitor voltage detection means that detects and outputs the voltage of the capacitor 4. 6
is a rice cooking means, and after a certain period of time after the rice cooking switch 1 is pressed by the delay means 2, or when the AC power source 7
is applied, and if the output of the capacitor voltage detection means 5 indicates that the voltage of the capacitor 4 is charged to a predetermined voltage or higher, the rice cooking operation is performed. When the user presses the rice cooking switch 1 to operate another external timer, the timer is turned on after a predetermined time, the AC power source 7 is applied, and the rice cooking means 6 starts the rice cooking operation as described above.

FIG. 2 is a circuit diagram of a rice cooker according to an embodiment of the present invention _.
and heater 8 are connected in series. This triax TRC ₁ consists of resistor R ₁ , transistor Q ₁ and resistor
It is turned on and off by the microcomputer 9 via _R2 . The rice cooking switch 1 is connected in series with a resistor R ₃ and is also connected to the input end of a microcomputer 9. Capacitor 4 is a resistor
It is charged via R ₄ and diode D ₁ , and the charging is controlled by a microcomputer 9 . Further, the discharge of the capacitor 4 is performed by the transistor Q ₂ via the resistor R ₅ .
On/off of _Q2 is controlled by microcomputer 9 via resistor _R6 . capacitor 4
The voltage between the terminals of is input to the comparator 10 together with the voltage set by the resistors R ₇ and R ₈ , and the voltage between the terminals of the comparator 10
The output of is input to the microcomputer ₉ via the resistor R9. A capacitor C ₁ , a diode D ₂ and a resistor R ₁₀ are connected in series to both ends of the AC power supply 7, and a resistor R ₁₁ is connected to both ends of the capacitor C ₁ .
and a constant voltage diode ZD ₁ are connected in series. The voltage across this constant voltage diode ZD ₁ is
It is supplied to the microcomputer 9 and the like as a DC power source.

If the user wants to cook rice using another external timer, connect the timer to the outlet and insert the rice cooker plug into the timer. First, before setting the timer, that is, with the AC power supply 7 applied, press the rice cooking switch 1. Then, capacitor 4, which had been discharged by transistor Q ₂ ,
Charging takes place. At this time, the transistor
Q ₂ is off. Thereafter, the user can set another external timer to the desired time. Although the AC power source 7 is no longer applied, the capacitor 4 does not discharge other than so-called leakage current and remains charged. After the timer time elapses, the AC power supply 7 is applied again, and the microcomputer 9 inputs the output of the comparator 10 immediately after operation. If the voltage of the capacitor 4 is higher than the voltage set by the resistors R ₇ and R ₈ , the output of the comparator 10 becomes high level, and the microcomputer 9 turns on the triac TRC ₁ to start the rice cooking operation. In this way, timer cooking can be performed using another external timer.

In the case of normal rice cooking, when the rice cooking switch 1 is pressed, the microcomputer 9 outputs an ON signal to the triact TRC ₁ after a certain period of delay, and the rice cooking operation starts. As already mentioned, this delay time does not pose any practical problem.

Effects of the Invention As described above, according to the present invention, even an electronically controlled rice cooker without a timer can be used with a simple configuration using one capacitor, and an external timer is used. You can cook rice on a timer.

[Brief explanation of the drawing]

FIG. 1 is a circuit block diagram of a rice cooker according to an embodiment of the present invention, and FIG. 2 is a circuit diagram thereof. 1...Rice cooking switch, 2...Delay means, 3...
Charging means, 4... Capacitor, 5... Capacitor voltage detection means, 6... Rice cooking means, 7... AC power supply.

Claims (1)

[Claims] 1. A rice cooking switch for starting the rice cooking operation, a delay means for delaying the output of the rice cooking switch for a certain period of time, a capacitor for memorizing the timer rice cooking state, and when the rice cooking switch is pressed. A charging means for charging the capacitor immediately, a capacitor voltage detection means for detecting the voltage across the terminals of the capacitor, and an output of the delay means are inputted and the output is inputted to the rice cooker switch after a certain period of time or when the AC power supply is turned on. a rice cooker that performs a rice cooking operation when the output of the capacitor voltage detection means indicates that the capacitor is charged to a predetermined voltage or more when the voltage is applied.