JP2006326142A - Rice cooker - Google Patents
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Description
本発明は、炊飯器の動作状態を表示する液晶表示装置とバックアップ機能のついた炊飯器に関するものである。 The present invention relates to a liquid crystal display device that displays an operation state of a rice cooker and a rice cooker having a backup function.
従来、この種の炊飯器は、炊飯器の動作を制御するマイクロコンピュータと、炊飯器の動作状態を表示する液晶表示装置と、商用交流電源を直流電圧に変換し少なくとも前記マイクロコンピュータに電力を供給する第１の電源手段と、前記第１の電源手段の出力に接続され前記液晶表示装置を駆動する電源を発生する第２の電源手段と、前記第２の電源手段の出力電圧を、使用する液晶表示素子の特性に合わせて複数の分圧抵抗を直列接続して分圧し、その分圧した電圧を液晶表示装置の駆動電圧として前記マイクロコンピュータに供給する液晶電源手段と、商用電源が無いときに少なくとも前記マイクロコンピュータと前記液晶電源手段に逆流防止手段を介して前記第１の電源手段より低い電圧で電力を供給するバックアップ手段とを備え、第２の電源手段は、商用電源の有無に関係なく略一定の電圧を出力するようにしている（例えば、特許文献１参照）。 Conventionally, this type of rice cooker has a microcomputer that controls the operation of the rice cooker, a liquid crystal display device that displays the operation state of the rice cooker, and a commercial AC power supply that converts DC power to a DC voltage and supplies power to at least the microcomputer. The first power supply means, the second power supply means connected to the output of the first power supply means for generating the power supply for driving the liquid crystal display device, and the output voltage of the second power supply means are used. When there is no commercial power supply with liquid crystal power supply means for connecting a plurality of voltage-dividing resistors in series according to the characteristics of the liquid crystal display element and dividing the voltage and supplying the divided voltage to the microcomputer as a driving voltage for the liquid crystal display device Further comprising at least the microcomputer and backup means for supplying power to the liquid crystal power supply means through the backflow prevention means at a voltage lower than that of the first power supply means. Second power supply means is to output a substantially constant voltage regardless of the commercial power supply (e.g., see Patent Document 1).
図４は、特許文献１に記載された従来の炊飯器のブロック図を示すものである。図４に示すように、１は炊飯器の動作を制御するマイクロコンピュータ、２は炊飯器の動作状態を表示する液晶表示装置、３は商用電源が無いときに少なくとも前記マイクロコンピュータ１に電力を供給するバックアップ用の電池、４はバックアップ用の電池３への充電を防止するための逆流防止手段となるダイオードで、前記電池３とともにバックアップ電源手段を構成している。５は液晶表示装置２の駆動電圧を減ずる減電圧手段、６は電圧低下検出手段を構成する電源電圧の検出手段で、前記減電圧手段５とともに第２の電源手段７（図示せず）を構成している。８は第１の電源手段を構成する第１の電源手段であり、マイクロコンピュータ１や電源電圧の検出手段６に電力を供給する。 FIG. 4 shows a block diagram of a conventional rice cooker described in Patent Document 1. As shown in FIG. As shown in FIG. 4, 1 is a microcomputer that controls the operation of the rice cooker, 2 is a liquid crystal display device that displays the operation state of the rice cooker, and 3 is a power supply to at least the microcomputer 1 when there is no commercial power supply. The backup battery 4 is a diode which serves as a backflow prevention means for preventing the backup battery 3 from being charged, and constitutes a backup power supply means together with the battery 3. Reference numeral 5 denotes a voltage reducing means for reducing the driving voltage of the liquid crystal display device 2, and 6 denotes a power supply voltage detecting means constituting a voltage drop detecting means, which constitutes a second power supply means 7 (not shown) together with the voltage reducing means 5. is doing. Reference numeral 8 denotes a first power supply means constituting the first power supply means, which supplies power to the microcomputer 1 and the power supply voltage detection means 6.
９、１０、１１は抵抗値の定数が等しい分圧抵抗であり、第２の電源手段７で出力する液晶表示装置２を駆動する電圧を３等分し、その分圧電圧を液晶表示装置の駆動電圧として、マイクロコンピュータ１に供給する液晶電源手段を構成している。
しかしながら、前記従来の構成では、停電が起きると第１の電源手段８からの出力はなくなるため、バックアップ用の電池３からダイオード４を介して分圧抵抗９、１０、１１に電力を供給することになり、バックアップ用の電池３の寿命を延ばすために分圧抵抗９、１０、１１の抵抗値を２００ｋΩ程度の大きい値にしている。 However, in the conventional configuration, if a power failure occurs, the output from the first power supply means 8 is lost, so that power is supplied from the backup battery 3 to the voltage dividing resistors 9, 10 and 11 via the diode 4. Therefore, in order to extend the life of the backup battery 3, the resistance values of the voltage dividing resistors 9, 10, and 11 are set to a large value of about 200 kΩ.
一方、液晶表示装置２をムラなく良好に駆動表示させるには、液晶表示装置２に印加する駆動波形をきれいな矩形波にする必要があり、前記液晶電源手段７の分圧抵抗は数ｋΩ（１ｋ〜２０ｋΩ）を推奨されているが、上記に述べたようにバックアップ用の電池３の寿命を優先するため、分圧抵抗９、１０、１１の抵抗値を小さくできないという課題を有していた。 On the other hand, in order to drive and display the liquid crystal display device 2 satisfactorily and uniformly, the drive waveform applied to the liquid crystal display device 2 needs to be a clean rectangular wave, and the voltage dividing resistance of the liquid crystal power supply means 7 is several kΩ (1 k). However, since the life of the backup battery 3 is given priority as described above, there is a problem that the resistance values of the voltage dividing resistors 9, 10, and 11 cannot be reduced.
本発明は、前記従来の課題を解決するもので、炊飯器の操作使用時に液晶電源手段を構成する分圧抵抗の抵抗値を小さくできる炊飯器を提供することを目的とする。 This invention solves the said conventional subject, and it aims at providing the rice cooker which can make small resistance value of the partial pressure resistance which comprises a liquid-crystal power supply means at the time of operation use of a rice cooker.
前記従来の課題を解決するために、本発明の炊飯器は、炊飯器の動作を制御するマイクロコンピュータと、炊飯器の動作状態を表示する液晶表示装置と、商用交流電源を直流電圧に変換し少なくとも前記マイクロコンピュータに電力を供給する第１の電源手段と、前記第１の電源手段の出力に接続され前記液晶表示装置を駆動する電源を発生する第２の電源手段と、前記第２の電源手段の出力電圧を、抵抗とスイッチ素子の直列回路を並列に接続した略等しい抵抗を少なくとも３個以上直列に接続して分圧し、その分圧した電圧を液晶表示装置の駆動電圧として、前記マイクロコンピュータに供給する液晶電源手段と、商用電源が無いときに少なくとも前記マイクロコンピュータと前記第２の電源手段に逆流防止手段を介して前記第１の電源手段より低い電圧で電力を供給するバックアップ手段とを備え、前記スイッチ素子は、前記第１の電源手段から前記第２の電源手段への電力の供給がない状態では、非通電状態になるようにしたものである。 In order to solve the conventional problems, the rice cooker of the present invention converts a microcomputer that controls the operation of the rice cooker, a liquid crystal display device that displays the operation state of the rice cooker, and a commercial AC power source into a DC voltage. First power supply means for supplying power to at least the microcomputer; second power supply means for generating a power supply connected to the output of the first power supply means for driving the liquid crystal display; and the second power supply The output voltage of the means is divided by connecting at least three or more equal resistors in series with a series circuit of a resistor and a switch element in series, and the divided voltage is used as a driving voltage for the liquid crystal display device. Liquid crystal power supply means for supplying to the computer, and when there is no commercial power supply, the first power supply through at least the microcomputer and the second power supply means via backflow prevention means Backup means for supplying power at a voltage lower than the stage, and the switch element is in a non-energized state when no power is supplied from the first power supply means to the second power supply means. It is a thing.
これによって、商用電源から第１の電源手段に電力を供給している間は、スイッチ素子が通電状態になっているので分圧抵抗にはスイッチ素子と直列に接続している抵抗が並列に接続され、合成抵抗値は分圧抵抗だけの抵抗値よりも小さくできるようになる。 As a result, while the power is supplied from the commercial power source to the first power source means, the switch element is energized, so that the resistor connected in series with the switch element is connected in parallel to the voltage dividing resistor. Thus, the combined resistance value can be made smaller than the resistance value of the voltage dividing resistor alone.
本発明の炊飯器は、炊飯器の操作使用時に液晶表示装置の駆動電圧を発生する液晶電源手段を構成する分圧抵抗の抵抗値を小さくし、液晶表示装置の表示をムラなく鮮明に表示させることができる。 The rice cooker of the present invention reduces the resistance value of the voltage dividing resistor constituting the liquid crystal power supply means for generating the driving voltage of the liquid crystal display device when operating the rice cooker, and displays the display of the liquid crystal display device clearly and uniformly. be able to.
第１の発明は、鍋を加熱する加熱手段と、前記加熱手段を駆動する加熱駆動手段と、炊飯器の動作を制御するマイクロコンピュータと、炊飯器の動作状態を表示する液晶表示装置と、商用交流電源を直流電圧に変換し少なくとも前記マイクロコンピュータに電力を供給する第１の電源手段と、前記第１の電源手段の出力に接続され前記液晶表示装置を駆動する電源を発生する第２の電源手段と、前記第２の電源手段の出力電圧を、抵抗とスイッチ素子の直列回路を並列に接続した略等しい抵抗を少なくとも３個以上直列に接続して分圧し、その分圧した電圧を液晶表示装置の駆動電圧として前記マイクロコンピュータに供給する液晶電源手段と、商用電源が無いときに少なくとも前記マイクロコンピュータと前記第２の電源手段に逆流防止手段を介して前記第１の電源手段より低い電圧で電力を供給するバックアップ手段とを備え、前記スイッチ素子は、前記第１の電源手段から前記第２の電源手段への電力の供給がない状態では非通電状態になるようにすることにより、商用電源から第１の電源手段に電力を供給している間は、スイッチ素子が通電状態になっているので分圧抵抗にはスイッチ素子と直列に接続している抵抗が並列に接続され、合成抵抗値は分圧抵抗だけの抵抗値よりも小さくできるようになり、液晶表示装置の表示をムラなく鮮明に表示させることができる。 1st invention is the heating means which heats a pan, the heating drive means which drives the said heating means, the microcomputer which controls operation | movement of a rice cooker, the liquid crystal display device which displays the operation state of a rice cooker, and commercial A first power supply means for converting an AC power supply into a DC voltage and supplying power to at least the microcomputer; and a second power supply for generating a power supply connected to the output of the first power supply means to drive the liquid crystal display device And the output voltage of the second power supply means are divided by connecting at least three or more resistors having a series circuit of resistors and a switch element connected in parallel to each other in series, and the divided voltage is displayed on a liquid crystal display. Liquid crystal power supply means for supplying the microcomputer as a drive voltage for the apparatus, and at least the microcomputer and the second power supply means when there is no commercial power supply. Backup means for supplying power at a voltage lower than that of the first power supply means through the switch element, and the switch element is in a state where no power is supplied from the first power supply means to the second power supply means. Since the switch element is energized while power is supplied from the commercial power source to the first power supply means, the voltage dividing resistor is connected in series with the switch element. Thus, the combined resistance value can be made smaller than the resistance value of the voltage dividing resistor, and the display of the liquid crystal display device can be displayed clearly and uniformly.
第２の発明は、鍋を加熱する加熱手段と、前記加熱手段を駆動する加熱駆動手段と、炊飯器の動作を制御するマイクロコンピュータと、炊飯器の動作状態を表示する液晶表示装置と、商用交流電源を直流電圧に変換し少なくとも前記マイクロコンピュータに電力を供給する第１の電源手段と、前記第１の電源手段の出力電圧を、抵抗とスイッチ素子の直列回路を並列に接続した略等しい分圧抵抗を少なくとも３個以上直列に接続して分圧し、その分圧した電圧を液晶表示装置の駆動電圧として前記マイクロコンピュータに供給する液晶電源手段と、前記第１の電源手段に接続され前記第１の電源手段からの電力を充電し、商用電源が無いときに少なくとも前記マイクロコンピュータと前記液晶電源手段に電力を供給する電圧保持手段とを備え、前記スイッチ素子は、前記第１の電源手段から前記液晶電源手段への電力の供給がない状態では非通電状態になるようにすることにより、商用電源から第１の電源手段に電力を供給している間は、スイッチ素子が通電状態になっているので分圧抵抗にはスイッチ素子と直列に接続している抵抗が並列に接続され、合成抵抗値は分圧抵抗だけの抵抗値よりも小さくできるようになり、液晶表示装置の表示をムラなく鮮明に表示させることができる。 The second invention includes a heating means for heating the pan, a heating drive means for driving the heating means, a microcomputer for controlling the operation of the rice cooker, a liquid crystal display device for displaying the operating state of the rice cooker, A first power supply means for converting an AC power supply into a DC voltage and supplying power to at least the microcomputer, and an output voltage of the first power supply means are substantially equal to each other by connecting a series circuit of a resistor and a switch element in parallel. At least three or more voltage resistors are connected in series to divide the voltage, and the divided voltage is supplied to the microcomputer as a driving voltage of the liquid crystal display device. The liquid crystal power supply means is connected to the first power supply means and connected to the first power supply means. Voltage holding means for charging power from one power supply means and supplying power to at least the microcomputer and the liquid crystal power supply means when there is no commercial power supply. The switch element supplies power from a commercial power source to the first power source means by being in a non-energized state when no power is supplied from the first power source means to the liquid crystal power source means. Since the switch element is in an energized state while the switch element is on, the resistor connected in series with the switch element is connected in parallel to the voltage dividing resistor, and the combined resistance value can be smaller than the resistance value of the voltage dividing resistor alone. As a result, the display of the liquid crystal display device can be displayed clearly and uniformly.
第３の発明は、特に、第１の発明または第２の発明の炊飯器において、第１の電源手段は、少なくとも前記マイクロコンピュータに電力を供給する出力電圧Ｖ１と少なくとも前記加熱駆動手段に電力を供給する出力電圧Ｖ２を出力する構成とし、前記スイッチ素子は、前記第１の電源手段のＶ２出力から電力を供給するように接続され、第１の電源手段のＶ２出力からの電力の供給があると通電状態になり、電力の供給がなくなると非通電状態となるようにすることにより、第１の電源手段から電力を供給している間だけ自動的にスイッチ素子が通電状態になっているので、分圧抵抗にはスイッチ素子と直列に接続している抵抗が並列に接続され、合成抵抗値は分圧抵抗だけの抵抗値よりも小さくできるようになり、液晶表示装置の表示をムラなく鮮明に表示させることができる。 According to a third aspect of the invention, in the rice cooker of the first aspect of the invention or the second aspect of the invention, the first power supply means supplies power to at least the output voltage V1 for supplying power to the microcomputer and at least the heating drive means. The output voltage V2 to be supplied is output, and the switch element is connected to supply power from the V2 output of the first power supply means, and power is supplied from the V2 output of the first power supply means. Since the switch element is automatically energized only while the power is supplied from the first power supply means, the energization state is established and the power supply is de-energized when the power supply is lost. In addition, a resistor connected in series with the switch element is connected in parallel to the voltage dividing resistor, so that the combined resistance value can be made smaller than the resistance value of the voltage dividing resistor alone, and the display of the liquid crystal display device is muted. Without thereby clearly displayed.
第４の発明は、特に、第１の発明または第２の発明の炊飯器において、商用交流電源の停電を検知する停電検知手段を備え、前記マイクロコンピュータは停電検知手段の出力に応じて前記スイッチ手段を通電もしくは非通電状態に制御するようにすることにより、炊飯器が商用電源に接続されている間はスイッチ素子を通電状態にし、分圧抵抗にはスイッチ素子と直列に接続している抵抗が並列に接続され、合成抵抗値は分圧抵抗だけの抵抗値よりも小さくできるようになり、液晶表示装置の表示をムラなく鮮明に表示させることができる。 According to a fourth aspect of the invention, in the rice cooker of the first aspect of the invention or the second aspect of the invention, the microcomputer further comprises a power failure detection means for detecting a power failure of a commercial AC power supply, and the microcomputer switches the switch according to the output of the power failure detection means. By controlling the means to be energized or de-energized, the switch element is energized while the rice cooker is connected to the commercial power source, and the voltage dividing resistor is a resistor connected in series with the switch element. Are connected in parallel, the combined resistance value can be made smaller than the resistance value of the voltage dividing resistance, and the display of the liquid crystal display device can be displayed clearly and uniformly.
第５の発明は、特に第１〜第４のいずれか１つの発明の炊飯器において、スイッチ素子と直列に接続された抵抗は、並列に接続された分圧抵抗よりも抵抗値を小さくすることにより、商用電源から第１の電源手段に電力を供給している間は、スイッチ素子が通電状態になっているので分圧抵抗にはスイッチ素子と直列に接続している抵抗が並列に接続され、合成抵抗値は分圧抵抗だけの抵抗値よりも十分小さくできるようになり、液晶表示装置の表示をムラなく鮮明に表示させることができる。 In a fifth aspect of the present invention, particularly in the rice cooker of any one of the first to fourth aspects of the invention, the resistance connected in series with the switch element has a resistance value smaller than the voltage dividing resistance connected in parallel. Thus, while the power is being supplied from the commercial power source to the first power supply means, the switch element is in an energized state, so that the resistor connected in series with the switch element is connected in parallel to the voltage dividing resistor. The combined resistance value can be made sufficiently smaller than the resistance value of only the voltage dividing resistance, and the display of the liquid crystal display device can be displayed clearly and uniformly.
以下、本発明の実施の形態について、図面を参照しながら説明する。なお、この実施の形態によって本発明が限定されるものではない。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.
（実施の形態１）
図１は、本発明の第１の実施の形態における炊飯器の主要部ブロック図を示すものである。なお、従来例と同じ構成のものは同一符号を付して一部説明を省略する。
(Embodiment 1)
FIG. 1: shows the principal part block diagram of the rice cooker in the 1st Embodiment of this invention. In addition, the thing of the same structure as a prior art example attaches | subjects the same code | symbol, and abbreviate | omits description.
図１において、マイクロコンピュータ１は商用交流電源２１により電力を供給される炊飯器を制御するもので、加熱駆動手段２２を介して鍋２３を加熱する加熱手段２４を制御する。 In FIG. 1, a microcomputer 1 controls a rice cooker that is supplied with power by a commercial AC power supply 21, and controls a heating means 24 that heats a pot 23 via a heating drive means 22.
液晶表示装置２は、炊飯器の動作状態を表示するもので、マイクロコンピュータ１は、炊飯器の状態に合わせて液晶表示装置２に信号を出力する。 The liquid crystal display device 2 displays the operation state of the rice cooker, and the microcomputer 1 outputs a signal to the liquid crystal display device 2 in accordance with the state of the rice cooker.
第１の電源手段８は商用交流電源２１を直流電圧に変換し、マイクロコンピュータ１に電力を供給する出力電圧Ｖ１と、加熱駆動手段２２に電力を供給する出力電圧Ｖ２を出力する。 The first power supply means 8 converts the commercial AC power supply 21 into a DC voltage, and outputs an output voltage V1 for supplying power to the microcomputer 1 and an output voltage V2 for supplying power to the heating drive means 22.
バックアップ手段である電池３は出力電圧Ｖ１よりも低電圧で電力を供給するため、充電を防止するための逆流防止手段となるダイオード４を介して第１の電源手段８のＶ１出力に接続されており、商用電源が無いときに少なくとも前記マイクロコンピュータ１に電力を供給する。 Since the battery 3 as the backup means supplies power at a voltage lower than the output voltage V1, it is connected to the V1 output of the first power supply means 8 via the diode 4 serving as a backflow prevention means for preventing charging. In the absence of a commercial power supply, power is supplied to at least the microcomputer 1.
第２の電源手段７は、第１の電源手段８のＶ１出力に接続され、商用電源２１の有無に関係なく電池３の出力電圧からダイオード４による電圧降下分を引いた電圧値にほぼ等しい電圧Ｖ３を出力するように構成されており、液晶表示装置２はＶ３出力電圧を動作電圧としている。 The second power supply means 7 is connected to the V1 output of the first power supply means 8 and has a voltage substantially equal to the voltage value obtained by subtracting the voltage drop due to the diode 4 from the output voltage of the battery 3 regardless of the presence or absence of the commercial power supply 21. The liquid crystal display device 2 is configured to output V3, and the liquid crystal display device 2 uses the V3 output voltage as an operating voltage.
分圧抵抗９、分圧抵抗１０、分圧抵抗１１は同じ定数の抵抗値をもつ分圧抵抗であり、直列に接続され、第２の電源手段７からの出力電圧Ｖ３を３等分するように接続されている。また、分圧抵抗９には、抵抗２５とスイッチ手段であるフォトカプラ２６の出力端子を直列に接続した回路を並列に接続している。同様に、分圧抵抗１０には、抵抗２７とスイッチ手段であるフォトカプラ２８の出力端子を直列に接続した回路を並列に接続している。さらに、分圧抵抗１１には、抵抗２９とスイッチ手段であるフォトカプラ３０の出力端子を直列に接続した回路を並列に接続している。この分圧抵抗９、分圧抵抗１０、分圧抵抗１１、抵抗２５、フォトカプラ２６、抵抗２７、フォトカプラ２８、抵抗２９、フォトカプラ３０からなる回路で液晶電源手段３１を構成している。 The voltage dividing resistor 9, the voltage dividing resistor 10, and the voltage dividing resistor 11 are voltage dividing resistors having the same constant resistance value, and are connected in series so as to divide the output voltage V3 from the second power supply means 7 into three equal parts. It is connected to the. Further, the voltage dividing resistor 9 is connected in parallel with a circuit in which the resistor 25 and the output terminal of the photocoupler 26 serving as a switch means are connected in series. Similarly, the voltage dividing resistor 10 is connected in parallel with a circuit in which the resistor 27 and the output terminal of the photocoupler 28 as a switch means are connected in series. Further, the voltage dividing resistor 11 is connected in parallel with a circuit in which the resistor 29 and the output terminal of the photocoupler 30 as a switching means are connected in series. The circuit comprising the voltage dividing resistor 9, the voltage dividing resistor 10, the voltage dividing resistor 11, the resistor 25, the photocoupler 26, the resistor 27, the photocoupler 28, the resistor 29, and the photocoupler 30 constitutes the liquid crystal power supply means 31.
このとき、分圧抵抗９と分圧抵抗１０と分圧抵抗１１は、約２００ｋΩ程度の抵抗値に設定し、抵抗２５と抵抗２７と抵抗２９は、同じ定数の抵抗値に設定し、１ｋΩ〜２０ｋΩ程度の抵抗値に設定している。 At this time, the voltage dividing resistor 9, the voltage dividing resistor 10, and the voltage dividing resistor 11 are set to resistance values of about 200 kΩ, and the resistors 25, 27, and 29 are set to the same constant resistance values. The resistance value is set to about 20 kΩ.
液晶電源手段３１は、分圧抵抗９と分圧抵抗１０と分圧抵抗１１の接続点から、第２の電源手段７からの出力電圧Ｖ３と、その電圧Ｖ３を分圧した電圧１／３×Ｖ３と２／３×Ｖ３を液晶表示装置の駆動電圧として、マイクロコンピュータ１に供給する。 The liquid crystal power supply means 31 is connected to the output voltage V3 from the second power supply means 7 from the connection point of the voltage dividing resistor 9, the voltage dividing resistor 10, and the voltage dividing resistor 11, and the voltage 1/3 × divided from the voltage V3. V3 and 2/3 × V3 are supplied to the microcomputer 1 as drive voltages for the liquid crystal display device.
一方、フォトカプラ２６とフォトカプラ２８とフォトカプラ３０は、信号入力端子であるダイオードを直列に接続されており、さらにフォトカプラ２６は電流制限抵抗３２を介して第１の電源手段８のＶ２出力に接続されている。 On the other hand, the photocoupler 26, the photocoupler 28, and the photocoupler 30 are connected in series with a diode that is a signal input terminal, and the photocoupler 26 further outputs the V2 output of the first power supply means 8 via the current limiting resistor 32. It is connected to the.
以上のように構成された炊飯器について、以下その動作、作用を説明する。 About the rice cooker comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.
まず、炊飯器が商用交流電源２１に接続されると、第１の電源手段８は商用交流電源２１を直流電圧に変換し、出力電圧Ｖ１と出力電圧Ｖ２を出力する。出力電圧Ｖ１にはマイクロコンピュータ１と第２の電源手段７が接続しており、出力電圧Ｖ２には加熱駆動手段２２と電流制限抵抗３２が接続しているので、フォトカプラ２６とフォトカプラ２８とフォトカプラ３０の入力端子には電流制限抵抗３２を介して出力電圧Ｖ２から電流を通電する。 First, when the rice cooker is connected to the commercial AC power source 21, the first power supply means 8 converts the commercial AC power source 21 into a DC voltage and outputs an output voltage V1 and an output voltage V2. Since the microcomputer 1 and the second power supply means 7 are connected to the output voltage V1, and the heating drive means 22 and the current limiting resistor 32 are connected to the output voltage V2, the photocoupler 26, the photocoupler 28, A current is supplied from the output voltage V <b> 2 to the input terminal of the photocoupler 30 via the current limiting resistor 32.
したがって、フォトカプラ２６とフォトカプラ２８とフォトカプラ３０の出力端子は通電状態になり、抵抗２５と抵抗２７と抵抗２９は、電気的にそれぞれ分圧抵抗９、分圧抵抗１０、分圧抵抗１１に並列に接続された状態となり、第２の電源手段７からの出力電圧Ｖ３を分圧する分圧抵抗の抵抗値は、ほぼ抵抗２５と抵抗２７と抵抗２９の抵抗値（１ｋΩ〜２０ｋΩ程度）となる。 Accordingly, the output terminals of the photocoupler 26, the photocoupler 28, and the photocoupler 30 are energized, and the resistors 25, 27, and 29 are electrically divided by the voltage dividing resistor 9, the voltage dividing resistor 10, and the voltage dividing resistor 11, respectively. The resistance value of the voltage dividing resistor that divides the output voltage V3 from the second power supply means 7 is approximately the resistance value of the resistor 25, the resistor 27, and the resistor 29 (about 1 kΩ to 20 kΩ). Become.
一方、炊飯器が停電状態になると、第１の電源手段８は出力電圧Ｖ１と出力電圧Ｖ２を出力しなくなる。このときは、バックアップ手段である電池３により、第１の電源手段８のＶ１出力に接続されているマイクロコンピュータ１と第２の電源手段７に電力を供給しているが、出力電圧Ｖ２に接続されている加熱駆動手段２２と電流制限抵抗３２には電力を供給しない。 On the other hand, when the rice cooker is in a power failure state, the first power supply means 8 does not output the output voltage V1 and the output voltage V2. At this time, the battery 3 serving as backup means supplies power to the microcomputer 1 and the second power supply means 7 connected to the V1 output of the first power supply means 8, but is connected to the output voltage V2. No power is supplied to the heating drive means 22 and the current limiting resistor 32 that are provided.
よってフォトカプラ２６とフォトカプラ２８とフォトカプラ３０の入力端子には電流を流さないため、フォトカプラ２６とフォトカプラ２８とフォトカプラ３０の出力端子は非通電状態になり、抵抗２５と抵抗２７と抵抗２９は、電気的にそれぞれ分圧抵抗９、分圧抵抗１０、分圧抵抗１１に非接続の状態となり、第２の電源手段７からの出力電圧Ｖ３を分圧する分圧抵抗の抵抗値は、分圧抵抗９、分圧抵抗１０、分圧抵抗１１の抵抗値（約２００ｋΩ）となり、バックアップ用の電池３から供給される電力を低減する。 Therefore, since no current flows through the input terminals of the photocoupler 26, the photocoupler 28, and the photocoupler 30, the output terminals of the photocoupler 26, the photocoupler 28, and the photocoupler 30 are in a non-energized state, and the resistors 25, 27, The resistor 29 is electrically disconnected from the voltage dividing resistor 9, the voltage dividing resistor 10, and the voltage dividing resistor 11, respectively, and the resistance value of the voltage dividing resistor that divides the output voltage V3 from the second power supply means 7 is The resistance values of the voltage dividing resistor 9, the voltage dividing resistor 10, and the voltage dividing resistor 11 (about 200 kΩ) are obtained, and the power supplied from the backup battery 3 is reduced.
以上のように、本実施の形態においては、第１の電源手段８は、商用交流電源２１を直流電圧に変換してマイクロコンピュータ１と第２の電源手段７に電力を供給する出力電圧Ｖ１と、加熱駆動手段２２と電流制限抵抗３２に電力を供給する出力電圧Ｖ２を出力し、液晶電源手段３１は、分圧抵抗９に抵抗２５とフォトカプラ２６の出力端子を直列に接続した回路を並列接続し、分圧抵抗１０に抵抗２７とフォトカプラ２８の出力端子を直列に接続した回路を並列接続し、分圧抵抗１１に抵抗２９とフォトカプラ３０の出力端子を直列に接続した回路を並列接続し、分圧抵抗９と分圧抵抗１０と分圧抵抗１１を直列に接続し、さらに、フォトカプラ２６とフォトカプラ２８とフォトカプラ３０の入力端子に電流制限抵抗３２を介して出力電圧Ｖ２から駆動電流を通電するように構成とすることにより、使用者が、炊飯器を使用せず、炊飯器に電源を入れていない間は、フォトカプラ２６とフォトカプラ２８とフォトカプラ３０が非通電状態になっているので、第２の電源手段７からの出力電圧Ｖ３を分圧する分圧抵抗の抵抗値は、分圧抵抗９と分圧抵抗１０と分圧抵抗１１の抵抗値（２００ｋΩ程度）となり、バックアップ用の電池３の寿命を延ばすことができ、炊飯器を使用するために、炊飯器に電源を入れると、商用電源２１から第１の電源手段８に電力を供給している間は、フォトカプラ２６とフォトカプラ２８とフォトカプラ３０が通電状態になっているので分圧抵抗９と分圧抵抗１０と分圧抵抗１１にはそれぞれ、抵抗２５と抵抗２７と抵抗２９が並列に接続され、第２の電源手段７からの出力電圧Ｖ３を分圧する分圧抵抗の抵抗値は、ほぼ抵抗２５と抵抗２７と抵抗２９の抵抗値（１ｋΩ〜２０ｋΩ程度）となり、液晶表示装置２の表示をムラなく鮮明に表示させることができる。 As described above, in the present embodiment, the first power supply means 8 converts the commercial AC power supply 21 into a DC voltage, and supplies the microcomputer 1 and the second power supply means 7 with power. The output voltage V2 for supplying power to the heating drive means 22 and the current limiting resistor 32 is output, and the liquid crystal power supply means 31 has a circuit in which the resistor 25 and the output terminal of the photocoupler 26 are connected in series to the voltage dividing resistor 9. A circuit in which the resistor 27 and the output terminal of the photocoupler 28 are connected in series to the voltage dividing resistor 10 is connected in parallel, and a circuit in which the resistor 29 and the output terminal of the photocoupler 30 are connected in series to the voltage divider resistor 11 is connected in parallel. The voltage dividing resistor 9, the voltage dividing resistor 10 and the voltage dividing resistor 11 are connected in series, and the output voltage is further connected to the input terminals of the photocoupler 26, the photocoupler 28 and the photocoupler 30 via the current limiting resistor 32. 2 is configured so that the drive current is applied from the photocoupler 26, the photocoupler 28, and the photocoupler 30 while the rice cooker is not used and the power is not turned on. Since the energized state, the resistance value of the voltage dividing resistor for dividing the output voltage V3 from the second power supply means 7 is the resistance value of the voltage dividing resistor 9, the voltage dividing resistor 10 and the voltage dividing resistor 11 (about 200 kΩ). The life of the backup battery 3 can be extended, and when the rice cooker is turned on in order to use the rice cooker, power is supplied from the commercial power supply 21 to the first power supply means 8. Since the photocoupler 26, the photocoupler 28, and the photocoupler 30 are energized, a resistor 25, a resistor 27, and a resistor 29 are connected in parallel to the voltage dividing resistor 9, the voltage dividing resistor 10, and the voltage dividing resistor 11, respectively. Connected, second The resistance value of the voltage dividing resistor that divides the output voltage V3 from the power supply means 7 is substantially the resistance value of the resistor 25, the resistor 27, and the resistor 29 (about 1 kΩ to 20 kΩ), and the display of the liquid crystal display device 2 is clear and uniform. Can be displayed.
（実施の形態２）
図２は、本発明の第２の実施の形態における炊飯器の主要部ブロック図を示すものである。
(Embodiment 2)
FIG. 2: shows the principal part block diagram of the rice cooker in the 2nd Embodiment of this invention.
図２において、マイクロコンピュータ１は商用交流電源２１により電力を供給される炊飯器を制御するもので、加熱駆動手段２２を介して鍋２３を加熱する加熱手段２４を制御する。 In FIG. 2, the microcomputer 1 controls a rice cooker that is supplied with electric power by a commercial AC power supply 21, and controls a heating means 24 that heats a pot 23 via a heating drive means 22.
液晶表示装置２は、炊飯器の動作状態を表示するもので、第１の電源手段８のＶ１出力電圧を動作電圧としている。マイクロコンピュータ１は、炊飯器の状態に合わせて液晶表示装置２に信号を出力する。 The liquid crystal display device 2 displays the operating state of the rice cooker, and uses the V1 output voltage of the first power supply means 8 as the operating voltage. The microcomputer 1 outputs a signal to the liquid crystal display device 2 in accordance with the state of the rice cooker.
第１の電源手段８は商用交流電源２１を直流電圧に変換し、マイクロコンピュータ１に電力を供給する出力電圧Ｖ１と、加熱駆動手段２２に電力を供給する出力電圧Ｖ２を出力する。 The first power supply means 8 converts the commercial AC power supply 21 into a DC voltage, and outputs an output voltage V1 for supplying power to the microcomputer 1 and an output voltage V2 for supplying power to the heating drive means 22.
電圧保持手段であるコンデンサ３３は第１の電源手段８のＶ１出力に接続されており、出力電圧Ｖ１が供給されている間に第１の電源手段８からの電力を充電し、商用電源２１が無いときに少なくとも前記マイクロコンピュータ１と前記液晶電源手段３１に電力を供給する。 The capacitor 33 which is a voltage holding means is connected to the V1 output of the first power supply means 8 and charges the power from the first power supply means 8 while the output voltage V1 is supplied, so that the commercial power supply 21 When there is no power, power is supplied to at least the microcomputer 1 and the liquid crystal power supply means 31.
液晶表示装置２は、動作電圧が第１の電源手段８のＶ１出力電圧のものとしている。 The liquid crystal display device 2 has an operating voltage of the V1 output voltage of the first power supply means 8.
分圧抵抗９、分圧抵抗１０、分圧抵抗１１は同じ定数の抵抗値をもつ分圧抵抗であり、直列に接続され、第１の電源手段８のＶ１出力を３等分するように接続されている。また、分圧抵抗９には、抵抗２５とスイッチ手段であるフォトカプラ２６の出力端子を直列に接続した回路を並列に接続している。同様に、分圧抵抗１０には、抵抗２７とスイッチ手段であるフォトカプラ２８の出力端子を直列に接続した回路を並列に接続している。さらに、分圧抵抗１１には、抵抗２９とスイッチ手段であるフォトカプラ３０の出力端子を直列に接続した回路を並列に接続している。この分圧抵抗９、分圧抵抗１０、分圧抵抗１１、抵抗２５、フォトカプラ２６、抵抗２７、フォトカプラ２８、抵抗２９、フォトカプラ３０からなる回路で液晶電源手段３１を構成している。 The voltage dividing resistor 9, the voltage dividing resistor 10, and the voltage dividing resistor 11 are voltage dividing resistors having the same constant resistance value, and are connected in series so that the V1 output of the first power supply means 8 is divided into three equal parts. Has been. Further, the voltage dividing resistor 9 is connected in parallel with a circuit in which the resistor 25 and the output terminal of the photocoupler 26 serving as a switch means are connected in series. Similarly, the voltage dividing resistor 10 is connected in parallel with a circuit in which the resistor 27 and the output terminal of the photocoupler 28 as a switch means are connected in series. Further, the voltage dividing resistor 11 is connected in parallel with a circuit in which the resistor 29 and the output terminal of the photocoupler 30 as a switching means are connected in series. The circuit comprising the voltage dividing resistor 9, the voltage dividing resistor 10, the voltage dividing resistor 11, the resistor 25, the photocoupler 26, the resistor 27, the photocoupler 28, the resistor 29, and the photocoupler 30 constitutes the liquid crystal power supply means 31.
このとき、分圧抵抗９と分圧抵抗１０と分圧抵抗１１は、約２００ｋΩ程度の抵抗値に設定し、抵抗２５と抵抗２７と抵抗２９は、同じ定数の抵抗値に設定し、１ｋΩ〜２０ｋΩ程度の抵抗値に設定している。 At this time, the voltage dividing resistor 9, the voltage dividing resistor 10, and the voltage dividing resistor 11 are set to resistance values of about 200 kΩ, and the resistors 25, 27, and 29 are set to the same constant resistance values. The resistance value is set to about 20 kΩ.
液晶電源手段３１は、分圧抵抗９と分圧抵抗１０と分圧抵抗１１の接続点から、第１の電源手段８のＶ１出力からの電圧Ｖ１と、その電圧Ｖ１を分圧した電圧１／３×Ｖ１と２／３×Ｖ１を液晶表示装置の駆動電圧として、マイクロコンピュータ１に供給する。 The liquid crystal power supply means 31 is connected to the voltage V1 output from the V1 output of the first power supply means 8 from the connection point of the voltage dividing resistor 9, the voltage dividing resistor 10, and the voltage dividing resistor 11, and the voltage 1 / 3 × V1 and 2/3 × V1 are supplied to the microcomputer 1 as drive voltages for the liquid crystal display device.
一方、フォトカプラ２６とフォトカプラ２８とフォトカプラ３０は、信号入力端子であるダイオードを直列に接続されており、さらにフォトカプラ２６は電流制限抵抗３２を介して第１の電源手段８のＶ２出力に接続されている。 On the other hand, the photocoupler 26, the photocoupler 28, and the photocoupler 30 are connected in series with a diode that is a signal input terminal, and the photocoupler 26 further outputs the V2 output of the first power supply means 8 via the current limiting resistor 32. It is connected to the.
以上のように構成された炊飯器について、以下その動作、作用を説明する。 About the rice cooker comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.
まず、炊飯器が商用交流電源２１に接続されると、第１の電源手段８は商用交流電源２１を直流電圧に変換し、出力電圧Ｖ１と出力電圧Ｖ２を出力する。出力電圧Ｖ１にはマイクロコンピュータ１と液晶電源手段３１とコンデンサ３３が接続しており、出力電圧Ｖ２には加熱駆動手段２２と電流制限抵抗３２が接続しているので、フォトカプラ２６とフォトカプラ２８とフォトカプラ３０の入力端子には電流制限抵抗３２を介して出力電圧Ｖ２から電流を通電する。 First, when the rice cooker is connected to the commercial AC power source 21, the first power supply means 8 converts the commercial AC power source 21 into a DC voltage and outputs an output voltage V1 and an output voltage V2. Since the microcomputer 1, the liquid crystal power supply means 31, and the capacitor 33 are connected to the output voltage V1, and the heating drive means 22 and the current limiting resistor 32 are connected to the output voltage V2, the photocoupler 26 and the photocoupler 28 are connected. The current from the output voltage V2 is supplied to the input terminal of the photocoupler 30 through the current limiting resistor 32.
したがって、フォトカプラ２６とフォトカプラ２８とフォトカプラ３０の出力端子は通電状態になり、抵抗２５と抵抗２７と抵抗２９は、電気的にそれぞれ分圧抵抗９、分圧抵抗１０、分圧抵抗１１に並列に接続された状態となり、第２の電源手段７からの出力電圧Ｖ３を分圧する分圧抵抗の抵抗値は、ほぼ抵抗２５と抵抗２７と抵抗２９の抵抗値（１ｋΩ〜２０ｋΩ程度）となる。また、コンデンサ３３には、出力電圧Ｖ１から電力を充電している。 Accordingly, the output terminals of the photocoupler 26, the photocoupler 28, and the photocoupler 30 are energized, and the resistors 25, 27, and 29 are electrically divided by the voltage dividing resistor 9, the voltage dividing resistor 10, and the voltage dividing resistor 11, respectively. The resistance value of the voltage dividing resistor that divides the output voltage V3 from the second power supply means 7 is approximately the resistance value of the resistor 25, the resistor 27, and the resistor 29 (about 1 kΩ to 20 kΩ). Become. The capacitor 33 is charged with power from the output voltage V1.
一方、炊飯器が停電状態になると、第１の電源手段８は出力電圧Ｖ１と出力電圧Ｖ２を出力しなくなる。このときは、電圧保持手段であるコンデンサ３３により、第１の電源手段８のＶ１出力に接続されているマイクロコンピュータ１と液晶電源手段３１に電力を供給しているが、出力電圧Ｖ２に接続されている加熱駆動手段２２と電流制限抵抗３２には電力を供給しない。 On the other hand, when the rice cooker is in a power failure state, the first power supply means 8 does not output the output voltage V1 and the output voltage V2. At this time, power is supplied to the microcomputer 1 and the liquid crystal power supply means 31 connected to the V1 output of the first power supply means 8 by the capacitor 33 which is a voltage holding means, but is connected to the output voltage V2. No power is supplied to the heating drive means 22 and the current limiting resistor 32.
よってフォトカプラ２６とフォトカプラ２８とフォトカプラ３０の入力端子には電流を流さないため、フォトカプラ２６とフォトカプラ２８とフォトカプラ３０の出力端子は非通電状態になり、抵抗２５と抵抗２７と抵抗２９は、電気的にそれぞれ分圧抵抗９、分圧抵抗１０、分圧抵抗１１に非接続の状態となり、第２の電源手段７からの出力電圧Ｖ３を分圧する分圧抵抗の抵抗値は、分圧抵抗９、分圧抵抗１０、分圧抵抗１１の抵抗値（約２００ｋΩ）となり、電圧保持手段であるコンデンサ３３から供給される電力を低減する。 Therefore, since no current flows through the input terminals of the photocoupler 26, the photocoupler 28, and the photocoupler 30, the output terminals of the photocoupler 26, the photocoupler 28, and the photocoupler 30 are in a non-energized state, and the resistors 25, 27, The resistor 29 is electrically disconnected from the voltage dividing resistor 9, the voltage dividing resistor 10, and the voltage dividing resistor 11, respectively, and the resistance value of the voltage dividing resistor that divides the output voltage V3 from the second power supply means 7 is The resistance values (about 200 kΩ) of the voltage dividing resistor 9, the voltage dividing resistor 10, and the voltage dividing resistor 11 are reduced, and the electric power supplied from the capacitor 33 as voltage holding means is reduced.
以上のように、本実施の形態においては、第１の電源手段８は、商用交流電源２１を直流電圧に変換してマイクロコンピュータ１と液晶電源手段３１に電力を供給する出力電圧Ｖ１と、加熱駆動手段２２と電流制限抵抗３２とコンデンサ３３に電力を供給する出力電圧Ｖ２を出力し、液晶電源手段３１は、分圧抵抗９に抵抗２５とフォトカプラ２６の出力端子を直列に接続した回路を並列接続し、分圧抵抗１０に抵抗２７とフォトカプラ２８の出力端子を直列に接続した回路を並列接続し、分圧抵抗１１に抵抗２９とフォトカプラ３０の出力端子を直列に接続した回路を並列接続し、分圧抵抗９と分圧抵抗１０と分圧抵抗１１を直列に接続し、さらに、フォトカプラ２６とフォトカプラ２８とフォトカプラ３０の入力端子に電流制限抵抗３２を介して出力電圧Ｖ２から駆動電流を通電するように構成とすることにより、使用者が、炊飯器を使用せず、炊飯器に電源を入れていない間は、フォトカプラ２６とフォトカプラ２８とフォトカプラ３０が非通電状態になっているので、第１の電源手段８のＶ１出力からの電圧Ｖ１を分圧する分圧抵抗の抵抗値は、分圧抵抗９と分圧抵抗１０と分圧抵抗１１の抵抗値（２００ｋΩ程度）となり、電圧保持用のコンデンサ３３の保持時間を延ばすことができ、炊飯器を使用するために、炊飯器に電源を入れると、商用電源２１から第１の電源手段８に電力を供給している間は、フォトカプラ２６とフォトカプラ２８とフォトカプラ３０が通電状態になっているので分圧抵抗９と分圧抵抗１０と分圧抵抗１１にはそれぞれ、抵抗２５と抵抗２７と抵抗２９が並列に接続され、第２の電源手段７からの出力電圧Ｖ３を分圧する分圧抵抗の抵抗値は、ほぼ抵抗２５と抵抗２７と抵抗２９の抵抗値（１ｋΩ〜２０ｋΩ程度）となり、液晶表示装置２の表示をムラなく鮮明に表示させることができる。 As described above, in the present embodiment, the first power supply means 8 converts the commercial AC power supply 21 into a DC voltage and supplies power to the microcomputer 1 and the liquid crystal power supply means 31, and the heating. An output voltage V2 for supplying power to the driving means 22, the current limiting resistor 32 and the capacitor 33 is output, and the liquid crystal power supply means 31 is a circuit in which the resistor 25 and the output terminal of the photocoupler 26 are connected in series to the voltage dividing resistor 9. A circuit in which a resistor 27 and an output terminal of the photocoupler 28 are connected in series to the voltage dividing resistor 10 is connected in parallel, and a circuit in which the resistor 29 and the output terminal of the photocoupler 30 are connected in series to the voltage dividing resistor 11. The voltage dividing resistor 9, the voltage dividing resistor 10, and the voltage dividing resistor 11 are connected in series, and a current limiting resistor 32 is connected to the input terminals of the photocoupler 26, the photocoupler 28, and the photocoupler 30. The configuration is such that the drive current is supplied from the output voltage V2 through the photocoupler 26, the photocoupler 28, and the photocoupler while the user does not use the rice cooker and does not turn on the rice cooker. Since the coupler 30 is in a non-energized state, the resistance values of the voltage dividing resistors for dividing the voltage V1 from the V1 output of the first power supply means 8 are the voltage dividing resistor 9, the voltage dividing resistor 10, and the voltage dividing resistor 11 respectively. Resistance value (about 200 kΩ), the holding time of the voltage holding capacitor 33 can be extended, and when the rice cooker is turned on in order to use the rice cooker, the first power supply means 8 from the commercial power supply 21 is turned on. Since the photocoupler 26, the photocoupler 28, and the photocoupler 30 are energized while the power is being supplied to the voltage dividing resistor 9, the voltage dividing resistor 10, the voltage dividing resistor 10, and the voltage dividing resistor 11, respectively, Resistance 27 and resistance The resistance value of the voltage dividing resistor for dividing the output voltage V3 from the second power supply means 7 is approximately the resistance value of the resistor 25, the resistor 27, and the resistor 29 (about 1 kΩ to 20 kΩ). The display of the liquid crystal display device 2 can be displayed clearly and uniformly.
（実施の形態３）
図３は、本発明の第３の実施の形態における炊飯器の主要部ブロック図を示すものである。
(Embodiment 3)
FIG. 3: shows the principal part block diagram of the rice cooker in the 3rd Embodiment of this invention.
図３において、マイクロコンピュータ１は商用交流電源２１により電力を供給される炊飯器を制御するもので、加熱駆動手段２２を介して鍋２３を加熱する加熱手段２４を制御する。 In FIG. 3, the microcomputer 1 controls a rice cooker that is supplied with electric power from a commercial AC power supply 21, and controls a heating means 24 that heats a pot 23 via a heating drive means 22.
液晶表示装置２は、炊飯器の動作状態を表示するもので、マイクロコンピュータ１は、炊飯器の状態に合わせて液晶表示装置２に信号を出力する。 The liquid crystal display device 2 displays the operation state of the rice cooker, and the microcomputer 1 outputs a signal to the liquid crystal display device 2 in accordance with the state of the rice cooker.
第１の電源手段８は商用交流電源２１を直流電圧に変換し、マイクロコンピュータ１に電力を供給する出力電圧Ｖ１と、加熱駆動手段２２に電力を供給する出力電圧Ｖ２を出力する。 The first power supply means 8 converts the commercial AC power supply 21 into a DC voltage, and outputs an output voltage V1 for supplying power to the microcomputer 1 and an output voltage V2 for supplying power to the heating drive means 22.
バックアップ手段である電池３は出力電圧Ｖ１よりも低電圧で電力を供給するため、充電を防止するための逆流防止手段となるダイオード４を介して第１の電源手段８のＶ１出力に接続されており、商用電源が無いときに少なくとも前記マイクロコンピュータ１に電力を供給する。 Since the battery 3 as the backup means supplies power at a voltage lower than the output voltage V1, it is connected to the V1 output of the first power supply means 8 via the diode 4 serving as a backflow prevention means for preventing charging. In the absence of a commercial power supply, power is supplied to at least the microcomputer 1.
第２の電源手段７は、第１の電源手段８のＶ１出力に接続され、商用電源２１の有無に関係なく電池３の出力電圧からダイオード４による電圧降下分を引いた電圧値にほぼ等しい電圧Ｖ３を出力するように構成されており、液晶表示装置２はＶ３出力電圧を動作電圧としている。 The second power supply means 7 is connected to the V1 output of the first power supply means 8 and has a voltage substantially equal to the voltage value obtained by subtracting the voltage drop due to the diode 4 from the output voltage of the battery 3 regardless of the presence or absence of the commercial power supply 21. The liquid crystal display device 2 is configured to output V3, and the liquid crystal display device 2 uses the V3 output voltage as an operating voltage.
分圧抵抗９、分圧抵抗１０、分圧抵抗１１は同じ定数の抵抗値をもつ分圧抵抗であり、直列に接続され、第２の電源手段７からの出力電圧Ｖ３を３等分するように接続されている。また、分圧抵抗９には、抵抗２５とスイッチ手段であるフォトカプラ２６の出力端子を直列に接続した回路を並列に接続している。同様に、分圧抵抗１０には、抵抗２７とスイッチ手段であるフォトカプラ２８の出力端子を直列に接続した回路を並列に接続している。さらに、分圧抵抗１１には、抵抗２９とスイッチ手段であるフォトカプラ３０の出力端子を直列に接続した回路を並列に接続している。この分圧抵抗９、分圧抵抗１０、分圧抵抗１１、抵抗２５、フォトカプラ２６、抵抗２７、フォトカプラ２８、抵抗２９、フォトカプラ３０からなる回路で液晶電源手段３１を構成している。 The voltage dividing resistor 9, the voltage dividing resistor 10, and the voltage dividing resistor 11 are voltage dividing resistors having the same constant resistance value, and are connected in series so as to divide the output voltage V3 from the second power supply means 7 into three equal parts. It is connected to the. Further, the voltage dividing resistor 9 is connected in parallel with a circuit in which the resistor 25 and the output terminal of the photocoupler 26 serving as a switch means are connected in series. Similarly, the voltage dividing resistor 10 is connected in parallel with a circuit in which the resistor 27 and the output terminal of the photocoupler 28 as a switch means are connected in series. Further, the voltage dividing resistor 11 is connected in parallel with a circuit in which the resistor 29 and the output terminal of the photocoupler 30 as a switching means are connected in series. The circuit comprising the voltage dividing resistor 9, the voltage dividing resistor 10, the voltage dividing resistor 11, the resistor 25, the photocoupler 26, the resistor 27, the photocoupler 28, the resistor 29, and the photocoupler 30 constitutes the liquid crystal power supply means 31.
このとき、分圧抵抗９と分圧抵抗１０と分圧抵抗１１は、約２００ｋΩ程度の抵抗値に設定し、抵抗２５と抵抗２７と抵抗２９は、同じ定数の抵抗値に設定し、１ｋΩ〜２０ｋΩ程度の抵抗値に設定している。 At this time, the voltage dividing resistor 9, the voltage dividing resistor 10, and the voltage dividing resistor 11 are set to resistance values of about 200 kΩ, and the resistors 25, 27, and 29 are set to the same constant resistance values. The resistance value is set to about 20 kΩ.
液晶電源手段３１は、分圧抵抗９と分圧抵抗１０と分圧抵抗１１の接続点から、第２の電源手段７からの出力電圧Ｖ３と、その電圧Ｖ３を分圧した電圧１／３×Ｖ３と２／３×Ｖ３を液晶表示装置の駆動電圧として、マイクロコンピュータ１に供給する。 The liquid crystal power supply means 31 is connected to the output voltage V3 from the second power supply means 7 from the connection point of the voltage dividing resistor 9, the voltage dividing resistor 10, and the voltage dividing resistor 11, and the voltage 1/3 × divided from the voltage V3. V3 and 2/3 × V3 are supplied to the microcomputer 1 as drive voltages for the liquid crystal display device.
一方、フォトカプラ２６とフォトカプラ２８とフォトカプラ３０は、信号入力端子であるダイオードを直列に接続されており、さらにフォトカプラ２６は電流制限抵抗３２を介して第１の電源手段８のＶ１出力に接続されて、フォトカプラ３０は、トランジスタ３４に接続されている。 On the other hand, the photocoupler 26, the photocoupler 28, and the photocoupler 30 are connected in series with a diode as a signal input terminal, and the photocoupler 26 further outputs the V1 output of the first power supply means 8 through the current limiting resistor 32. The photocoupler 30 is connected to the transistor 34.
停電検知手段３５は、商用交流電源２１に接続され、商用交流電源２１の通電状態を監視して、通電状態をマイクロコンピュータ１に出力する。マイクロコンピュータ１は、その信号を入力し、商用交流電源２１が通電状態である信号のときはトランジスタ３４を通電状態になる信号を出力し、商用交流電源２１が停電状態である信号のときはトランジスタ３４を非通電状態になる信号を出力する。 The power failure detection means 35 is connected to the commercial AC power supply 21, monitors the energized state of the commercial AC power supply 21, and outputs the energized state to the microcomputer 1. The microcomputer 1 inputs the signal, outputs a signal for energizing the transistor 34 when the commercial AC power supply 21 is energized, and outputs a signal when the commercial AC power supply 21 is a power outage signal. 34 outputs a signal for deenergizing.
以上のように構成された炊飯器について、以下その動作、作用を説明する。 About the rice cooker comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.
まず、炊飯器が商用交流電源２１に接続されると、第１の電源手段８は商用交流電源２１を直流電圧に変換し、出力電圧Ｖ１と出力電圧Ｖ２を出力する。出力電圧Ｖ１にはマイクロコンピュータ１と第２の電源手段７と流制限抵抗３２が接続しており、出力電圧Ｖ２には加熱駆動手段２２が接続しているので、フォトカプラ２６とフォトカプラ２８とフォトカプラ３０の入力端子には電流制限抵抗３２を介して出力電圧Ｖ１から電流を通電する。 First, when the rice cooker is connected to the commercial AC power source 21, the first power supply means 8 converts the commercial AC power source 21 into a DC voltage and outputs an output voltage V1 and an output voltage V2. Since the microcomputer 1, the second power supply means 7 and the current limiting resistor 32 are connected to the output voltage V1, and the heating drive means 22 is connected to the output voltage V2, the photocoupler 26, the photocoupler 28, A current is supplied from the output voltage V <b> 1 to the input terminal of the photocoupler 30 via the current limiting resistor 32.
停電検知手段３５は、商用交流電源２１が通電状態である信号をマイクロコンピュータ１に出力するので、マイクロコンピュータ１はトランジスタ３４を通電状態になる信号を出力する。 Since the power failure detection means 35 outputs a signal indicating that the commercial AC power supply 21 is energized to the microcomputer 1, the microcomputer 1 outputs a signal for energizing the transistor 34.
したがって、フォトカプラ２６とフォトカプラ２８とフォトカプラ３０の出力端子は通電状態になり、抵抗２５と抵抗２７と抵抗２９は、電気的にそれぞれ分圧抵抗９、分圧抵抗１０、分圧抵抗１１に並列に接続された状態となり、第２の電源手段７からの出力電圧Ｖ３を分圧する分圧抵抗の抵抗値は、ほぼ抵抗２５と抵抗２７と抵抗２９の抵抗値（１ｋΩ〜２０ｋΩ程度）となる。 Accordingly, the output terminals of the photocoupler 26, the photocoupler 28, and the photocoupler 30 are energized, and the resistors 25, 27, and 29 are electrically divided by the voltage dividing resistor 9, the voltage dividing resistor 10, and the voltage dividing resistor 11, respectively. The resistance value of the voltage dividing resistor that divides the output voltage V3 from the second power supply means 7 is approximately the resistance value of the resistor 25, the resistor 27, and the resistor 29 (about 1 kΩ to 20 kΩ). Become.
一方、炊飯器が停電状態になると、第１の電源手段８は出力電圧Ｖ１と出力電圧Ｖ２を出力しなくなる。このときは、バックアップ手段である電池３により、第１の電源手段８のＶ１出力に接続されているマイクロコンピュータ１と第２の電源手段７と電流制限抵抗３２に電力を供給しているが、出力電圧Ｖ２に接続されている加熱駆動手段２２には電力を供給しない。 On the other hand, when the rice cooker is in a power failure state, the first power supply means 8 does not output the output voltage V1 and the output voltage V2. At this time, power is supplied to the microcomputer 1, the second power supply means 7 and the current limiting resistor 32 connected to the V1 output of the first power supply means 8 by the battery 3 as the backup means. No power is supplied to the heating drive means 22 connected to the output voltage V2.
停電検知手段３５は、商用交流電源２１が停電状態である信号をマイクロコンピュータ１に出力するので、マイクロコンピュータ１はトランジスタ３４を非通電状態になる信号を出力する。 Since the power failure detection means 35 outputs a signal indicating that the commercial AC power supply 21 is in a power failure state to the microcomputer 1, the microcomputer 1 outputs a signal for turning off the transistor 34.
よってフォトカプラ２６とフォトカプラ２８とフォトカプラ３０の入力端子には電流を流さないため、フォトカプラ２６とフォトカプラ２８とフォトカプラ３０の出力端子は非通電状態になり、抵抗２５と抵抗２７と抵抗２９は、電気的にそれぞれ分圧抵抗９、分圧抵抗１０、分圧抵抗１１に非接続の状態となり、第２の電源手段７からの出力電圧Ｖ３を分圧する分圧抵抗の抵抗値は、分圧抵抗９、分圧抵抗１０、分圧抵抗１１の抵抗値（約２００ｋΩ）となり、バックアップ用の電池３から供給される電力を低減する。 Therefore, since no current flows through the input terminals of the photocoupler 26, the photocoupler 28, and the photocoupler 30, the output terminals of the photocoupler 26, the photocoupler 28, and the photocoupler 30 are in a non-energized state, and the resistors 25, 27, The resistor 29 is electrically disconnected from the voltage dividing resistor 9, the voltage dividing resistor 10, and the voltage dividing resistor 11, respectively, and the resistance value of the voltage dividing resistor that divides the output voltage V3 from the second power supply means 7 is The resistance values of the voltage dividing resistor 9, the voltage dividing resistor 10, and the voltage dividing resistor 11 (about 200 kΩ) are obtained, and the power supplied from the backup battery 3 is reduced.
以上のように、本実施の形態においては、第１の電源手段８は、商用交流電源２１を直流電圧に変換してマイクロコンピュータ１と第２の電源手段７と電流制限抵抗３２に電力を供給する出力電圧Ｖ１と、加熱駆動手段２２に電力を供給する出力電圧Ｖ２を出力し、液晶電源手段３１は、分圧抵抗９に抵抗２５とフォトカプラ２６の出力端子を直列に接続した回路を並列接続し、分圧抵抗１０に抵抗２７とフォトカプラ２８の出力端子を直列に接続した回路を並列接続し、分圧抵抗１１に抵抗２９とフォトカプラ３０の出力端子を直列に接続した回路を並列接続し、分圧抵抗９と分圧抵抗１０と分圧抵抗１１を直列に接続し、さらに、フォトカプラ２６とフォトカプラ２８とフォトカプラ３０の入力端子に電流制限抵抗３２とトランジスタ３４を介して、駆動電流を通電するように構成とし、トランジスタ３４は、停電検知手段３５からの出力に応じて通電状態か非通電状態に切換える構成とすることにより、使用者が、炊飯器を使用せず、炊飯器に電源を入れていない間は、フォトカプラ２６とフォトカプラ２８とフォトカプラ３０が非通電状態になっているので、第２の電源手段７からの出力電圧Ｖ３を分圧する分圧抵抗の抵抗値は、分圧抵抗９と分圧抵抗１０と分圧抵抗１１の抵抗値（２００ｋΩ程度）となり、バックアップ用の電池３の寿命を延ばすことができ、炊飯器を使用するために、炊飯器に電源を入れると、商用電源２１から第１の電源手段８に電力を供給している間は、フォトカプラ２６とフォトカプラ２８とフォトカプラ３０が通電状態になっているので分圧抵抗９と分圧抵抗１０と分圧抵抗１１にはそれぞれ、抵抗２５と抵抗２７と抵抗２９が並列に接続され、第２の電源手段７からの出力電圧Ｖ３を分圧する分圧抵抗の抵抗値は、ほぼ抵抗２５と抵抗２７と抵抗２９の抵抗値（１ｋΩ〜２０ｋΩ程度）となり、液晶表示装置の表示をムラなく鮮明に表示させることができる。 As described above, in the present embodiment, the first power supply unit 8 converts the commercial AC power supply 21 into a DC voltage and supplies power to the microcomputer 1, the second power supply unit 7, and the current limiting resistor 32. The output voltage V1 to be output and the output voltage V2 to supply power to the heating drive means 22 are output, and the liquid crystal power supply means 31 has a circuit in which the resistor 25 and the output terminal of the photocoupler 26 are connected in series to the voltage dividing resistor 9 in parallel. A circuit in which the resistor 27 and the output terminal of the photocoupler 28 are connected in series to the voltage dividing resistor 10 is connected in parallel, and a circuit in which the resistor 29 and the output terminal of the photocoupler 30 are connected in series to the voltage divider resistor 11 is connected in parallel. The voltage dividing resistor 9, the voltage dividing resistor 10, and the voltage dividing resistor 11 are connected in series, and the current limiting resistor 32 and the transistor 3 are connected to the input terminals of the photocoupler 26, the photocoupler 28, and the photocoupler 30. The transistor 34 is configured to energize the drive current, and the transistor 34 is configured to switch between the energized state and the non-energized state according to the output from the power failure detection means 35, so that the user uses the rice cooker. Since the photocoupler 26, the photocoupler 28, and the photocoupler 30 are not energized while the rice cooker is not powered on, the output voltage V3 from the second power supply means 7 is divided. In order to use the rice cooker, the resistance value of the pressure resistance becomes the resistance value (about 200 kΩ) of the voltage dividing resistor 9, the voltage dividing resistor 10, and the voltage dividing resistor 11, and can extend the life of the backup battery 3. When the rice cooker is turned on, the photocoupler 26, the photocoupler 28, and the photocoupler 30 are energized while the power is being supplied from the commercial power supply 21 to the first power supply means 8. Resistance A resistor 25, a resistor 27, and a resistor 29 are connected in parallel to the resistor 9, the voltage dividing resistor 10, and the voltage dividing resistor 11, respectively, and the resistance value of the voltage dividing resistor that divides the output voltage V3 from the second power supply means 7. Is substantially the resistance value of the resistor 25, the resistor 27, and the resistor 29 (about 1 kΩ to 20 kΩ), and the display of the liquid crystal display device can be displayed clearly and uniformly.
さらに、マイクロコンピュータは、停電検知手段３５からの信号に関係なく、トランジスタ３４を非通電状態にすることにより、商用交流電源２１が通電状態ででも炊飯器の状態により、自由に分圧抵抗の抵抗値を切換えることができる。 Further, the microcomputer freely turns off the transistor 34 regardless of the signal from the power failure detection means 35, so that the resistance of the voltage dividing resistor can be freely set according to the state of the rice cooker even when the commercial AC power supply 21 is energized. The value can be switched.
以上のように、本発明にかかる炊飯器は、操作使用時に商用交流電源に接続され通電している間は、液晶表示装置の駆動電圧を発生する液晶電源手段を構成する分圧抵抗の抵抗値を小さくし、液晶表示装置の表示をムラなく鮮明に表示させることができるので、家庭用途のみならず業務用途の炊飯器や、バックアップ機能の付いた液晶表示装置付きの調理機器などの用途にも応用できる。 As described above, the rice cooker according to the present invention is a resistance value of the voltage dividing resistor that constitutes the liquid crystal power supply means for generating the driving voltage of the liquid crystal display device while being connected to the commercial AC power supply during operation and being energized. The display on the liquid crystal display device can be displayed clearly and evenly, so that it can be used not only for home use but also for rice cookers for business use and cooking equipment with a liquid crystal display device with a backup function. Can be applied.
１ マイクロコンピュータ
２ 液晶表示装置
３ 電池（バックアップ手段）
４ ダイオード（逆流防止手段）
７ 第２の電源手段
８ 第１の電源手段
９、１０、１１ 分圧抵抗
２１ 商用交流電源
２２ 加熱駆動手段
２３ 鍋
２４ 加熱手段
２５ 抵抗
２６ フォトカプラ（スイッチ手段）
２７ 抵抗
２８ フォトカプラ（スイッチ手段）
２９ 抵抗
３０ フォトカプラ（スイッチ手段）
３１ 液晶電源手段
３２ 電流制限抵抗
1 Microcomputer 2 Liquid crystal display device 3 Battery (backup means)
4 Diode (Backflow prevention means)
7 Second power supply means 8 First power supply means 9, 10, 11 Voltage dividing resistor 21 Commercial AC power supply 22 Heating drive means 23 Pot 24 Heating means 25 Resistance 26 Photocoupler (switch means)
27 Resistor 28 Photocoupler (switching means)
29 Resistance 30 Photocoupler (switch means)
31 Liquid crystal power supply means 32 Current limiting resistor
Claims (5)
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| JP2005156796A JP4604841B2 (en) | 2005-05-30 | 2005-05-30 | rice cooker |
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| JP2005156796A JP4604841B2 (en) | 2005-05-30 | 2005-05-30 | rice cooker |
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| JP2006326142A true JP2006326142A (en) | 2006-12-07 |
| JP4604841B2 JP4604841B2 (en) | 2011-01-05 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009266407A (en) * | 2008-04-22 | 2009-11-12 | Panasonic Corp | Heating cooking device |
| JP2012047426A (en) * | 2010-08-30 | 2012-03-08 | Panasonic Corp | Cooking appliance |
| JP2014140506A (en) * | 2013-01-24 | 2014-08-07 | Hitachi Appliances Inc | Rice cooker |
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| JPS6316999A (en) * | 1986-07-08 | 1988-01-23 | 川崎重工業株式会社 | Abrasive water jet cutter |
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| JPS63188196A (en) * | 1987-01-30 | 1988-08-03 | 日本電気株式会社 | Slit resistance switching circuit |
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| JP2014140506A (en) * | 2013-01-24 | 2014-08-07 | Hitachi Appliances Inc | Rice cooker |
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| JP4604841B2 (en) | 2011-01-05 |
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