JPH0554763B2 - - Google Patents

Description

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

Conventional technology In conventional rice cookers with a clock function, the main component is a large-capacity electrolytic capacitor (equivalent to several F) as a DC power source to back up the clock function so that it continues to operate even if the power outlet is disconnected. A power supply was added. The dimensions of this large-capacity electrolytic capacitor conventionally used in commercially available rice cookers are 13 mm in diameter x 37 mm in length.
Two were used.

Problems to be Solved by the Invention In a rice cooker with such a conventional configuration, the large size of this large capacitor requires a large space on the electronic circuit board, and as a result, the entire board inevitably becomes large. Therefore, when incorporating it into a product, a large amount of space is required within the product, which has been a major bottleneck in product design.

Additionally, since it is a large power supply capacitor, it must be fixed to the board in some way to ensure the reliability of the product during vibrations, etc., and as a result, it is very time-consuming to assemble. It was hot. Furthermore, it has become extremely expensive in terms of cost.

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 DC power source obtained by rectifying and hand-selecting a commercial power source, a secondary battery that can be repeatedly charged and discharged, and the commercial power source a charging means for charging the secondary battery from the DC power supply while the commercial power supply is being applied; and power is supplied from the DC power supply while the commercial power supply is being applied, and from the secondary battery when the commercial power supply is stopped; As it moves,
This configuration includes clock means for outputting the current time.

Effect According to the above configuration, when commercial power is not applied, power is supplied to the clock means from the backup DC power source whose main component is a secondary battery that can be charged and discharged repeatedly, and it starts operating. Therefore, there are many types of secondary power sources, but the ones that can be used in terms of performance with the rice cooker of the present invention are
Two pieces of 20mm x 2mm thick are enough.
Therefore, compared to conventional capacitors using large-capacity electrolytic capacitors, there are significant advantages in terms of space on the board, ease of installation, and cost.

Embodiment Hereinafter, an embodiment of the present invention will be described based on FIGS. 1 to 3.

FIG. 1 shows a block diagram of a rice cooker according to an embodiment of the present invention. Reference numeral 1 denotes a commercial power source, and a DC power source 2 is produced by rectifying and smoothing the commercial power source 1. Reference numeral 3 denotes a secondary battery that can be repeatedly charged and discharged, and is charged from a DC power source 2 via a charging means 4 while a commercial power source 1 is applied to the secondary battery 3. 5 is a clock means that outputs the current time. The clock means 5 is powered by the DC power source 2 while the commercial power source 1 is applied, and is powered by the secondary battery 3 when the commercial power source 1 is stopped.
6 is a display means, and this display means 6 receives the output from the clock means 5 and displays the current time. 7 is a rice cooking switch for starting the rice cooking operation;
is a reservation means for setting a timer time for timer cooking. Reference numeral 9 denotes a rice cooking means, and if the rice cooking means 9 has a timer time set by the reservation means 8 when the rice cooking switch 7 is pressed,
A timer rice cooking operation is performed in which the rice cooking operation is completed when the output of the clock means 5 coincides with the timer time, and if the timer time is not set, the rice cooking operation is performed immediately.

FIG. 2 shows a circuit diagram of a rice cooker according to an embodiment of the present invention. Reference numeral 11 is a commercial power source, and a heater 12 and a relay contact 13a are connected in series at both ends. On the other hand, the commercial power supply 11 is stepped down by a transformer 14 and full-wave rectified by a rectifier circuit 15 . This is converted into a DC power source by diodes 16 and 20, a capacitor 17, a resistor 18, and a voltage regulator diode 19, and serves as a power source for the microcomputer 21.

22 and 23 are secondary batteries;
While the commercial power supply 11 is applied to the transistor 23, the transistor 26 is turned on by the resistors 24 and 25, and the transistor 23 is rapidly charged by the resistor 27 having a small resistance value. When the application of the commercial power source 11 is stopped, charging of the secondary batteries 22 and 23 is stopped, and this secondary battery 2
2 and 23 supply power to the microcomputer 21 via a resistor 28. Switches 29 to 33 are connected in series with resistors 34 to 38, respectively, and are input to the microcomputer 21. Reference numeral 29 denotes a current time setting switch. After pressing this switch, the current time is input into the microcomputer 21 by a time setting switch 31 and a minute setting switch 32. Reference numeral 30 designates a timer time setting switch, and after pressing this, the timer time is input into the microcomputer 21 using a time setting switch 31 and a minute setting switch 32. 33 is a rice cooking switch, and this rice cooking switch 33 has a microcontroller so that if the timer time adjustment switch 30 is pressed and the timer time is set, timer rice cooking will be performed, and if the timer time is not set, the rice cooking operation will be started immediately. input into the computer 21. When cooking rice, the microcomputer 21 turns on and off the transistor 40 via the resistor 39, energizes the relay coil 13b,
Power is cut off. This turns the heater 12 on and off to cook rice. 41 is a liquid crystal display element (LCD), and this liquid crystal display element 41 displays the current time and timer time.

As mentioned above, when the application of the commercial power supply 11 is stopped in this circuit, power is supplied from the secondary batteries 22 and 23 and the microcomputer 21 operates. Large capacity electrolytic capacitors were used instead of secondary batteries.

Figures 3 and 4 show actual scale drawings of the parts of the conventional example and this embodiment, and 51 in Figures 3a and b is the large-capacity electrolytic capacitor shown in the conventional example;
Further, 52 in FIGS. 4a and 4b is the secondary battery of this embodiment. As is clear from FIGS. 3a, b and 4a, b, in this embodiment, the space occupied on the electronic circuit board is reduced, and
Since it is a type that can stand on its own like a general electronic component, there is no need for the component 53 for improving vibration resistance as shown in FIGS. 3a and 3b.

Effects of the Invention As described above, according to the present invention, since the secondary battery is used as a backup power source for the clock means when the application of commercial power is stopped, it is possible to reduce the space occupied on the board. As a result, it is possible to provide an electronically controlled rice cooker that can reduce the size of the board, has high reliability including installation, and is inexpensive.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a rice cooker showing an embodiment of the present invention, Fig. 2 is a circuit diagram of the same rice cooker, and Figs.
b and FIGS. 4a and 4b show the state in which a conventional large-capacity electrolytic capacitor and a secondary battery according to an embodiment of the present invention are respectively attached to an electronic circuit board.
A is a plan view, and b is a front view. 1... Commercial power supply, 2... DC power supply, 3, 22,
23, 52... Secondary battery, 4... Charging means, 5...
...Clock means, 6...Display means, 7...Rice cooking switch, 8...Reservation means, 9...Rice cooking means, 21...
microcomputer.

Claims (1)

[Claims] 1. A DC power source obtained by rectifying and smoothing a commercial power source, a secondary battery that can be repeatedly charged and discharged, a charging means for charging the secondary battery from the DC power source while the commercial power source is applied, and a charging means for charging the secondary battery from the DC power source while the commercial power source is applied. While the power is being applied, it is powered by the DC power supply, and when it is stopped, it is powered by the secondary battery, and it operates;
a clock means for outputting the current time; a display means for displaying the output of the clock means; a rice cooking switch for starting a rice cooking operation; a reservation means for setting a timer time for timer rice cooking; If the timer time is set by the reservation means when is pressed, timer rice cooking is performed to complete the rice cooking operation when the output of the clock means coincides with the timer time, and if not set, the rice cooking operation is started immediately. A rice cooker comprising a means for cooking rice.