WO2012008250A1 - 充電式電気機器 - Google Patents

充電式電気機器 Download PDF

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Publication number
WO2012008250A1
WO2012008250A1 PCT/JP2011/063454 JP2011063454W WO2012008250A1 WO 2012008250 A1 WO2012008250 A1 WO 2012008250A1 JP 2011063454 W JP2011063454 W JP 2011063454W WO 2012008250 A1 WO2012008250 A1 WO 2012008250A1
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WIPO (PCT)
Prior art keywords
secondary battery
count value
display unit
rechargeable electric
charging
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PCT/JP2011/063454
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English (en)
French (fr)
Inventor
一訓 渡部
広次 浅川
誠一 岩尾
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パナソニック電工株式会社
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Application filed by パナソニック電工株式会社 filed Critical パナソニック電工株式会社
Priority to CN2011800325493A priority Critical patent/CN102959825A/zh
Priority to US13/807,671 priority patent/US20130169217A1/en
Priority to RU2012157792/07A priority patent/RU2012157792A/ru
Priority to EP11806581.2A priority patent/EP2595271A4/en
Publication of WO2012008250A1 publication Critical patent/WO2012008250A1/ja

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/488—Cells or batteries combined with indicating means for external visualization of the condition, e.g. by change of colour or of light density
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
    • H02J7/0049—Detection of fully charged condition
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present invention relates to an electric device that charges a secondary battery, and more particularly, to a rechargeable electric device that displays a remaining capacity of the secondary battery when the secondary battery is charged.
  • Patent Document 1 in the charging mode of the secondary battery, the count value is up-counted every certain time to virtually estimate the current battery capacity, and linked to the display operation in the battery capacity display unit corresponding to the count value A technique for providing sex is described.
  • JP-7-264782 A Japanese Laid-Open Patent Publication No. 7-264782
  • the present invention has been made in view of the above, and an object of the present invention is to provide a rechargeable electric device with improved accuracy of displaying the remaining capacity of a secondary battery.
  • the rechargeable electrical device supplies a charging current to the secondary battery via the switching element to charge the secondary battery
  • the charging current is A rechargeable electric device defined by a duty ratio of a switching signal for controlling on / off of a switching element, a counter for counting a count value corresponding to a charging time of a secondary battery, and a count counted by the counter
  • the display unit that displays the remaining capacity of the secondary battery corresponding to the value, and after starting the charging of the secondary battery, the count value of the counter has reached the first predetermined value corresponding to the fully charged secondary battery Or when the duty ratio of the switching signal falls below a predetermined value corresponding to the charging current when the secondary battery is fully charged, a full charge display indicating that the secondary battery is fully charged is displayed on the display unit. Equipped with a control device to perform That.
  • the full charge display when the count value reaches a value corresponding to the full charge of the secondary battery, or the duty ratio corresponds to the charge current at the time of full charge. Since the full charge display is performed when the value becomes lower than the value, the full charge display can be performed with higher accuracy.
  • FIG. 1 shows a configuration of a rechargeable electric apparatus according to the first embodiment.
  • FIG. 2 shows a correspondence relationship between the LED1 to LED5 of the display unit and the count value in the rechargeable electric device according to the first embodiment.
  • FIG. 3 shows a state where the LEDs 1 to 5 of the display unit in the rechargeable electric device according to the first embodiment display in stages.
  • FIG. 4 is a flowchart illustrating the procedure of the display operation of the display unit in the rechargeable electric device according to the first embodiment.
  • FIG. 5 is a flowchart illustrating the procedure of the display operation of the display unit in the rechargeable electric device according to the second embodiment.
  • FIG. 6 shows a display example of the LEDs 1 to 5 of the display unit in the rechargeable electric apparatus according to the first embodiment.
  • FIG. 7 shows a display example of the LEDs 1 to 5 of the display unit in the rechargeable electric apparatus according to the second embodiment.
  • the rechargeable electrical device includes a secondary battery 11, a current supply source 12, a charger 13, a control device 14, and a display unit 15.
  • the secondary battery 11 is formed of a battery such as a nickel metal hydride battery or a nickel cadmium battery, and is charged by a charging current supplied from the current supply source 12 via the charger 13.
  • the current supply source 12 supplies a direct current to the charger 13.
  • the direct current is supplied from an AC commercial power supply of about 100 V to 240 V, for example, via an AC adapter.
  • the charger 13 includes a switching element 131 such as a transistor.
  • the switching element 131 is connected between the secondary battery 11 and the current supply source 12.
  • the switching element 131 receives a direct current supplied from the current supply source 12, and controls and adjusts the charging current supplied to the secondary battery 11 by PWM control that performs on / off control of the switching element 131 based on the switching signal. .
  • the control device 14 functions as a control center for controlling the operation of the rechargeable electrical device, and is a microcomputer equipped with hardware resources such as a CPU and a storage device necessary for controlling various operation processes based on a program. It is realized by. Various functions for displaying the charging operation of the secondary battery 11 and the remaining capacity are realized by executing the processing program by the CPU of the microcomputer constituting the control device 14.
  • the control device 14 performs pulse width modulation (PWM) control by giving a switching signal to the switching element 131 and performing on / off control of the switching element 131 based on the switching signal.
  • PWM pulse width modulation
  • increase / decrease of the charging current is controlled.
  • the control device 14 supplies a desired charging current corresponding to the battery voltage of the secondary battery 11 to the secondary battery 11 to control charging of the secondary battery 11.
  • the relationship between the battery voltage and the duty ratio of the secondary battery 11 is stored and prepared in, for example, a storage device of the control device 14 as preset table data. In the charging operation of the secondary battery 11, as the battery voltage of the secondary battery 11 rises and the remaining capacity approaches full charge, the duty ratio of the switching signal is reduced and the charging current is controlled to be reduced.
  • the control device 14 includes a counter (counter) that adds (counts up) a count value at regular intervals during a charging operation. As described above, the counter virtually estimates the current remaining capacity of the secondary battery 11 based on the count value, and the display operation on the display unit 15 is performed based on the count value.
  • the count value is increased or decreased from 0 to 100, the count value is 0 to 11 and the remaining capacity is in the range of 0 to 20%, the count value is 12 to 33, the remaining capacity is in the range of 21 to 40%, the count value is 34 to 55, the remaining capacity is set in the range of 41-60%, the count value 56-77, the remaining capacity is in the range of 61-80%, and the count value 78-100, the remaining capacity is set in the range of 81-100%.
  • the control device 14 has a function of controlling the count-up of the counter so as to set it to an arbitrary count value.
  • the display unit 15 includes, for example, five light emitting diodes LED1 to LED5 arranged in a column. As shown in FIG. 2, LEDs 1 to 5 are assigned to the display unit 15 corresponding to the count value of the counter. In FIG. 2, LED 1 is assigned corresponding to count values 0 to 11, LED 2 is assigned corresponding to count values 12 to 33, LED 3 is assigned corresponding to count values 34 to 55, and LED 4 is assigned count value. The LEDs 5 are assigned corresponding to the count values 78 to 100.
  • the display unit 15 blinks the LED corresponding to the current count value of the counter, lights the LED corresponding to the count value smaller than the current count value, and is larger than the current count value.
  • the LED corresponding to the count value is turned off and displayed.
  • the display unit 15 displays the charging state (remaining capacity) of the secondary battery by turning on the LEDs 1 and 2, turning on the LED 3, and turning off the LEDs 4 and 5. .
  • the display unit 15 is controlled so that the remaining capacity of the secondary battery 11 can be displayed step by step in five steps by the five LEDs 1 to 5 under the control of the control device 14. That is, as shown in FIG. 3, after LED1 blinks and lights up, LED2 blinks and lights up, so that LED1 ⁇ LED2 ⁇ LED3 ⁇ LED4 ⁇ LED5 is blinked step by step and turned on. .
  • FIG. 4 is a flowchart showing the procedure of the display operation process of the display unit 15 when the secondary battery 11 is charged.
  • step S401 it is determined whether or not the count value has reached a predetermined value C1, here “100” (step S402).
  • steps S404 to S406 are executed. That is, when the charging operation is started, the duty ratio of the switching signal supplied to the switching element 131 of the charger 13 is detected (step S404). Subsequently, it is determined whether or not the duty ratio of the switching signal is equal to or less than a predetermined value D set in advance (step S405).
  • the predetermined value D is set to the value of the duty ratio of the switching signal that generates the charging current supplied to the secondary battery 11 when the secondary battery 11 is fully charged.
  • Step S406 when the duty ratio becomes equal to or less than the predetermined value D, it is estimated that the secondary battery 11 is fully charged and has a remaining capacity of 100%, and the count value of the counter is set to the predetermined value C1, here “100”.
  • the predetermined value C1 here “100”.
  • step S404 if the duty ratio is not less than or equal to the predetermined value D, it is estimated that the secondary battery 11 is not yet fully charged, and the process returns to step S404 to continue the duty ratio detection operation.
  • the duty ratio of the switching signal that defines the charging current is equal to the charging current when the secondary battery 11 is fully charged.
  • the value is equal to or less than the corresponding value
  • full charge is displayed on the display unit 15.
  • FIG. 5 is a flowchart showing the procedure of the display operation process of the display unit 15 when the secondary battery 11 is charged in the rechargeable electric device according to the second embodiment.
  • the feature of the procedure shown in the flowchart of FIG. 5 is that, compared to the procedure shown in FIG. 4, the steps S501 and S502 are started after the charging is started and before the processes shown in steps S401 and S404 in FIG. The other processing is the same as in FIG. Therefore, in FIG. 5, steps S503 to S505 are the same as steps S401 to S403 in FIG. 4, and steps S506 to S508 are the same as steps S404 to S406 in FIG.
  • step S501 when charging of the secondary battery 11 is started, the counter is incremented at predetermined time intervals and the count value is added (step S501). Thereafter, it is determined whether or not the count value has reached a predetermined value C2, here "90" (step S502).
  • the process returns to the previous step S402 to continue the counter count-up operation. .
  • the LEDs 1 to 5 corresponding to the count value blink and are controlled to be displayed.
  • the secondary battery 11 is not fully charged, but is estimated to have been charged to a remaining capacity of about 90% of the fully charged state, and the display unit 15 LED 5 blinks.
  • processing similar to the procedure shown in FIG. 4 is executed to display full charge after the secondary battery 11 is determined to be fully charged.
  • the duty ratio is already below the predetermined value D with respect to the count value “20”. For this reason, the count value is changed from “20” to “100”, and as shown in FIG. 6, the LEDs 2 to 5 are turned on instantaneously from the state where the LED 2 corresponding to the count value “20” is blinking.
  • the display changes to the fully charged display state. In such a display form, there is a possibility that a person who is viewing the display unit 15 may feel uncomfortable.
  • the LEDs are sequentially flashed and lit according to the count value, and the LED 5 is flashed and then the LED 5 is lit.
  • the display part 15 generation
  • the rechargeable electric device according to the embodiment can be applied to, for example, an electric razor, an electric clipper, a hair removal device, an electric toothbrush, and the like.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

　充電式電気機器は、二次電池（１１）の充電を開始した後、カウンタのカウント値が二次電池（１１）の満充電に対応した所定値（Ｃ１）に達した場合、またはスイッチング素子（１３１）をオン／オフ制御するスイッチング信号のデューティ比が二次電池（１１）の満充電時の充電電流に対応した所定値（Ｄ）以下になった場合に、二次電池（１１）が満充電状態であることを表示部（１５）に示す満充電表示を制御装置（１４）の制御の下に行う。

Description

充電式電気機器
　本発明は、二次電池を充電する電気機器に関し、特に二次電池の充電時に二次電池の残容量を表示する充電式電気機器に関する。
　従来、この種の技術としては、特許文献１に記載されたものが知られている。特許文献１には、二次電池の充電モード時に、一定時間毎にカウント値をアップカウントして現在の電池容量を仮想的に見積もり、カウント値に対応して電池容量表示部における表示動作に連動性をもたせる技術が記載されている。
日本国特開平７－２６４７８２号公報(JP 7-264782 A)
　特許文献１の技術では、充電動作と満充電表示とが連動していない場合には、満充電表示後の充電動作の継続により待機電力が増加するおそれがあった。このような要因や負荷の状態によっては、カウント値と二次電池の残容量との間に誤差が生じるおそれがあった。すなわち、カウント値＜＜二次電池の実際の残容量となり、カウント値によって見積もられる二次電池の残容量が実際の二次電池の残容量よりもかなり少なくなり、両者の間に大きな誤差が生じるおそれがあった。
　このような状態において、充電動作を開始すると、二次電池が満充電状態になっているにもかかわらず、カウント値は満充電に対応した値に達しておらず、カウント値に対応した表示部では、満充電を精度良く表示することが困難になるおそれがあった。
　本発明は、上記に鑑みてなされたものであり、二次電池の残容量表示の精度を向上した充電式電気機器を提供することを目的とする。
　上記目的を達成するために、本発明の第一の技術的側面に係る充電式電気機器は、スイッチング素子を介して二次電池に充電電流を供給して二次電池を充電し、充電電流はスイッチング素子をオン／オフ制御するスイッチング信号のデューティ比で規定される充電式電気機器であって、二次電池の充電時間に対応したカウント値を計数する計数器と、計数器で計数されたカウント値に対応した二次電池の残容量を表示する表示部と、二次電池の充電を開始した後、計数器のカウント値が二次電池の満充電に対応した第１の所定値に達した場合、またはスイッチング信号のデューティ比が二次電池の満充電時の充電電流に対応した所定値以下になった場合に、表示部に二次電池が満充電状態であることを示す満充電表示を行う制御装置とを備える。
　本発明の第一の技術的側面に係る充電式電気機器によれば、カウント値が二次電池の満充電に対応した値に達した場合、またはデューティ比が満充電時の充電電流に対応した値以下になった場合に、満充電表示を行うようにしたので、より精度良く満充電の表示を行うことが可能となる。
図１は、実施形態１に係る充電式電気機器の構成を示す。 図２は、実施形態１に係る充電式電気機器における表示部のＬＥＤ１～ＬＥＤ５とカウント値との対応関係を示す。 図３は、実施形態１に係る充電式電気機器における表示部のＬＥＤ１～ＬＥＤ５が段階的に表示する様子を示す。 図４は、実施形態１に係る充電式電気機器における表示部の表示動作の手順を示すフローチャートである。 図５は、実施形態２に係る充電式電気機器における表示部の表示動作の手順を示すフローチャートである。 図６は、実施形態１に係る充電式電気機器における表示部のＬＥＤ１～ＬＥＤ５の一表示例を示す。 図７は、実施形態２に係る充電式電気機器における表示部のＬＥＤ１～ＬＥＤ５の一表示例を示す。
　以下、図面を用いて実施形態を説明する。
（実施形態１）
　図１に示す実施形態１に係る充電式電気機器は、二次電池１１と、電流供給源１２と、充電器１３と、制御装置１４と、表示部１５とを備える。
　二次電池１１は、例えばニッケル水素電池やニッケル・カドミウム電池などの電池で構成され、充電器１３を介して電流供給源１２から与えられる充電電流によって充電される。
　電流供給源１２は、充電器１３に直流電流を供給する。直流電流は、例えば、１００Ｖ～２４０Ｖ程度の交流の商用電源からＡＣアダプターを介して供給される。
　充電器１３は、トランジスタなどのスイッチング素子１３１を備える。スイッチング素子１３１は、二次電池１１と電流供給源１２との間に接続される。スイッチング素子１３１は、電流供給源１２から与えられる直流電流を受けて、スイッチング信号に基づいてスイッチング素子１３１をオン／オフ制御するＰＷＭ制御により、二次電池１１に供給される充電電流を制御調整する。
　制御装置１４は、充電式電気機器の動作を制御する制御中枢として機能し、プログラムに基づいて各種動作処理を制御するために必要な、ＣＰＵや記憶装置等のハードウェア資源を備えたマイクロコンピュータ等により実現される。制御装置１４を構成するマイクロコンピュータのＣＰＵで処理プログラムが実行されることによって、二次電池１１の充電動作ならびに残容量を表示するための各種機能が実現される。
　制御装置１４は、スイッチング素子１３１にスイッチング信号を与え、スイッチング信号に基づいてスイッチング素子１３１をオン／オフ制御することで、パルス幅変調（ＰＷＭ）制御を行う。ＰＷＭ制御によりスイッチング信号のデューティ比を可変制御することで、充電電流の増減が制御される。制御装置１４は、例えば二次電池１１の電池電圧に応じた所望の充電電流を二次電池１１に供給して、二次電池１１の充電を制御する。二次電池１１の電池電圧とデューティ比との関係は、例えば予め設定されたテーブルデータとして制御装置１４の記憶装置などに記憶されて用意されている。二次電池１１の充電動作において、二次電池１１の電池電圧が上昇して残容量が満充電に近づくにしたがって、スイッチング信号のデューティ比が小さくなり、充電電流が少なくなるように制御される。
　制御装置１４は、充電動作時に一定時間毎にカウント値を加算（カウントアップ）するカウンタ（計数器）を備える。カウンタは、上述したように、カウント値により二次電池１１の現在の残容量を仮想的に見積もり、カウント値に基づいて表示部１５における表示動作が行われる。カウント値は、例えば０～１００の値を増減し、カウント値０～１１で残容量が０～２０％の範囲、カウント値１２～３３で残容量が２１～４０％の範囲、カウント値３４～５５で残容量が４１～６０％の範囲、カウント値５６～７７で残容量が６１～８０％の範囲、カウント値７８～１００で残容量が８１～１００％の範囲となるように設定されている。制御装置１４は、カウンタのカウントアップを制御して、任意のカウント値に設定するように制御する機能を備える。
　表示部１５は、例えば、縦列配置された５個の発光ダイオードＬＥＤ１～ＬＥＤ５で構成される。表示部１５は、ＬＥＤ１～ＬＥＤ５が図２に示すように上記カウンタのカウント値に対応して割り当てられる。図２において、ＬＥＤ１はカウント値０～１１に対応して割り当てられ、ＬＥＤ２はカウント値１２～３３に対応して割り当てられ、ＬＥＤ３はカウント値３４～５５に対応して割り当てられ、ＬＥＤ４はカウント値５６～７７に対応して割り当てられ、ＬＥＤ５はカウント値７８～１００に対応して割り当てられる。
　表示部１５は、二次電池１１の充電動作において、カウンタの現在のカウント値に対応したＬＥＤは点滅、現在のカウント値よりも小さいカウント値に対応したＬＥＤは点灯、現在のカウント値よりも大きいカウント値に対応したＬＥＤは消灯して表示される。例えば、カウント値が「５０」の場合には、表示部１５は、ＬＥＤ１，ＬＥＤ２が点灯し、ＬＥＤ３が点滅し、ＬＥＤ４，ＬＥＤ５が消灯して二次電池の充電状態（残容量）を表示する。
　表示部１５は、制御装置１４の制御の下に、５個のＬＥＤ１～ＬＥＤ５により二次電池１１の残容量を５段階に順を追って段階的に表示可能に制御される。すなわち、図３に示すように、ＬＥＤ１が点滅して点灯した後、ＬＥＤ２が点滅して点灯するといったように、ＬＥＤ１→ＬＥＤ２→ＬＥＤ３→ＬＥＤ４→ＬＥＤ５の順序で段階的に点滅、点灯表示される。
　図４は二次電池１１の充電時における表示部１５の表示動作処理の手順を示すフローチャートである。
　図４において、先ず、カウント値によって見積もられる二次電池１１の残容量が実際の二次電池１１の残容量よりも少ない状態において、制御装置１４の制御の下に二次電池１１に充電電流が供給されて二次電池１１の充電が開始される。そして、予め設定された一定時間毎にカウンタがカウントアップして、カウント値が加算される（ステップＳ４０１）。その後、カウント値が所定値Ｃ１、ここでは「１００」に達したか否かを判定する（ステップＳ４０２）。
　判定の結果、カウント値が所定値Ｃ１＝１００に達した場合は、二次電池１１は満充電されて残容量１００％であると推定され、表示部１５のすべてのＬＥＤ１～ＬＥＤ５を点灯して、満充電であることを表示する（ステップＳ４０３）。一方、カウント値が所定値Ｃ１＝１００に達していない場合には、二次電池１１はいまだ満充電されていないものと推定され、先のステップＳ４０２に戻ってカウンタのカウントアップ動作を続ける。これにより、カウント値に対応したＬＥＤ１～ＬＥＤ５が点滅、点灯制御されて表示される。
　このようなステップＳ４０１～Ｓ４０３で示す一連の処理と並行して、ステップＳ４０４～Ｓ４０６に示す処理が実行される。すなわち、充電動作が開始されると、充電器１３のスイッチング素子１３１に供給されるスイッチング信号のデューティ比を検出する（ステップＳ４０４）。続いて、スイッチング信号のデューティ比が予め設定された所定値Ｄ以下であるか否かを判定する（ステップＳ４０５）。ここで、所定値Ｄは、二次電池１１が満充電状態に充電されたときに二次電池１１に供給される充電電流を生成するスイッチング信号のデューティ比の値に設定される。
　判定の結果、デューティ比が所定値Ｄ以下になった場合は、二次電池１１は満充電されて残容量１００％であると推定し、カウンタのカウント値を所定値Ｃ１、ここでは「１００」に変更する（ステップＳ４０６）。その後、表示部１５のすべてのＬＥＤ１～ＬＥＤ５を点灯して、満充電であることを表示する（ステップＳ４０３）。
　一方、デューティ比が所定値Ｄ以下でない場合には、二次電池１１はいまだ満充電されていないものと推定して、先のステップＳ４０４に戻ってデューティ比の検出動作を続ける。
　このように、上記実施形態１においては、カウント値に連動した表示部１５の表示動作と並行して、充電電流を規定するスイッチング信号のデューティ比が二次電池１１の満充電ときの充電電流に対応した値以下になったときに、表示部１５に満充電を表示するようにしている。これにより、カウント値が満充電に対応した値でない場合でも、表示部１５に二次電池１１が満充電になったことを表示することが可能となり、カウンタ値だけに基づいて満充電を表示していた従来に比べて、満充電表示の精度を向上することができる。
（実施形態２）
　図５は、実施形態２に係る充電式電気器において、二次電池１１の充電時における表示部１５の表示動作処理の手順を示すフローチャートである。図５のフローチャートに示す手順の特徴とするところは、先の図４に示す手順に比べて、充電を開始した後、図４のステップＳ４０１ならびにステップＳ４０４で示す処理の前に、ステップＳ５０１、Ｓ５０２の処理を追加したことであり、他は先の図４と同様である。したがって、図５において、ステップＳ５０３～Ｓ５０５は図４のステップＳ４０１～Ｓ４０３と同様の処理であり、ステップＳ５０６～Ｓ５０８は図４のステップＳ４０４～Ｓ４０６と同様の処理である。
　図５において、先ず、二次電池１１の充電を開始すると、予め設定された一定時間毎にカウンタがカウントアップしてカウント値が加算される（ステップＳ５０１）。その後、カウント値が所定値Ｃ２、ここでは「９０」に達したか否かを判定する（ステップＳ５０２）。
　判定の結果、カウント値が所定値Ｃ２＝９０に達していない場合には、二次電池１１は満充電されていないものと推定して、先のステップＳ４０２に戻ってカウンタのカウントアップ動作を続ける。これにより、カウント値に対応したＬＥＤ１～ＬＥＤ５が点滅、点灯制御されて表示される。一方、カウント値が所定値Ｃ２＝９０に達した場合は、二次電池１１は満充電されていないが、満充電状態の９０％程度の残容量まで充電されたものと推定し、表示部１５のＬＥＤ５を点滅表示する。
　その後、先の図４に示す手順と同様の処理を実行して、二次電池１１が満充電状態と判定された後満充電の表示を行う。
　先の実施形態１における処理手順において、例えばカウント値が「２０」で二次電池１１の残容量が概ね満充電の状態で充電を開始すると、表示飛びが発生するおそれがあった。
　このような状態においては、カウント値が「２０」に対してデューティ比は既に所定値Ｄ以下になっている。このため、カウント値は「２０」から「１００」に変更され、図６に示すように、カウント値「２０」に対応したＬＥＤ２が点滅している状態から、瞬時にＬＥＤ２～ＬＥＤ５が点灯して満充電の表示状態に移行する。このような表示形態では、表示部１５を視認している者に違和感を与えるおそれがあった。
　そこで、この実施形態２では、上述した処理を追加することで、図７に示すように、カウント値に対応して順次ＬＥＤが点滅、点灯表示されてＬＥＤ５が点滅表示された後、ＬＥＤ５が点灯して満充電の表示を行うことが可能となる。これにより、表示部１５において、表示飛びが発生することは抑制され、使用者に違和感を与えることは回避される。
　実施形態に係る充電式電気機器は、例えば、電気かみそり、電動バリカン、脱毛器、電動歯ブラシなどに適用することができる。

Claims (3)

  1. 　スイッチング素子を介して二次電池に充電電流を供給して前記二次電池を充電し、前記充電電流は、前記スイッチング素子をオン／オフ制御するスイッチング信号のデューティ比で規定される充電式電気機器であって、
    　前記二次電池の充電時間に対応したカウント値を計数する計数器と、
    　前記計数器で計数された前記カウント値に対応した前記二次電池の残容量を表示する表示部と、
    　前記二次電池の充電を開始した後、前記計数器のカウント値が前記二次電池の満充電に対応した第１の所定値に達した場合、または前記スイッチング信号のデューティ比が前記二次電池の満充電時の充電電流に対応した所定値以下になった場合に、前記表示部に前記二次電池が満充電状態であることを示す満充電表示を行う制御装置と
    を備えた充電式電気機器。
  2. 　請求項１に記載の充電式電気機器であって、
    　前記表示部は、前記二次電池の残容量を段階的に表示する
    ことを特徴とする充電式電気機器。
  3. 　請求項１または２に記載の充電式電気機器であって、
    　前記制御装置は、前記二次電池の充電を開始した後、前記計数器のカウント値が前記第１の所定値に達する前であって、前記カウント値が第２の所定値に達するまでは、前記計数器のカウント値に対応した前記二次電池の残容量を前記表示部に表示させる
    ことを特徴とする充電式電気機器。
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EP2595271A1 (en) 2013-05-22
EP2595271A4 (en) 2016-01-20

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