JPH0733564Y2 - Charging circuit - Google Patents
Charging circuitInfo
- Publication number
- JPH0733564Y2 JPH0733564Y2 JP9262989U JP9262989U JPH0733564Y2 JP H0733564 Y2 JPH0733564 Y2 JP H0733564Y2 JP 9262989 U JP9262989 U JP 9262989U JP 9262989 U JP9262989 U JP 9262989U JP H0733564 Y2 JPH0733564 Y2 JP H0733564Y2
- Authority
- JP
- Japan
- Prior art keywords
- battery
- charging
- temperature
- charged
- current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000001514 detection method Methods 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000000630 rising effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Description
【考案の詳細な説明】 （イ）産業上の利用分野 本考案は、充電中の電池温度特性を利用して充電を制御
する充電回路に関するものである。DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a charging circuit that controls charging by utilizing battery temperature characteristics during charging.
（ロ）従来の技術 被充電電池の過充電を防止するための充電制御方法とし
て充電中の電池温度特性を利用するものがあるが、従来
では、実開昭61−92148号公報に示されているように、
予め所定温度を設定しておき、充電末期に電池温度が上
昇して所定値に達した時に充電電流を制御するもの等が
あった。この場合、電池温度を検出する温度検出素子は
周囲温度の影響を受け易いために正確な電池温度を検出
することができず、即ち、正確な充電状態を検知するこ
とができずに過充電あるいは充電不足となることがあっ
た。(B) Conventional technology As a charging control method for preventing overcharging of a battery to be charged, there is a method of utilizing a temperature characteristic of a battery during charging, which is conventionally disclosed in Japanese Utility Model Publication No. 61-92148. Like
There has been a system in which a predetermined temperature is set in advance and the charging current is controlled when the battery temperature rises to a predetermined value at the end of charging. In this case, the temperature detection element that detects the battery temperature cannot easily detect the accurate battery temperature because it is easily affected by the ambient temperature, that is, the overcharge or the overcharge without detecting the accurate charge state. There were times when the battery was low.
（ハ）考案が解決しようとする課題 本考案は、かかる点に鑑み電池の正確な充電状態を検知
して充電を制御する充電回路を提供することにある。(C) Problem to be Solved by the Invention In view of such a point, the present invention is to provide a charging circuit that detects an accurate charging state of a battery and controls charging.
（ニ）課題を解決するための手段 被充電電池に充電電流を供給する供給手段と、充電中の
電池温度を検出する検出手段を、単位変化温度当りの充
電所要時間を逐次演算し、連続する２つの演算値を逐次
比較した値が所定値を満足する時に電池への充電電流を
制御する演算・制御手段とを設ける。(D) Means for Solving the Problems A supply means for supplying a charging current to a battery to be charged and a detection means for detecting a battery temperature during charging are successively calculated by continuously calculating a required charging time per unit temperature change. Arithmetic / control means is provided for controlling the charging current to the battery when the value obtained by sequentially comparing the two calculated values satisfies a predetermined value.
（ホ）作用 本考案は、単位変化温度当りの充電所要時間を逐次演算
することにより連続する２つの演算値を逐次比較するも
のであり、充電中の周囲温度の変化は顕著でないために
急激に電池温度が上昇する充電末期には、前記演算値の
比較結果は周囲温度を相殺してほぼ電池温度の変化量の
みを示す。(E) Action The present invention successively compares two consecutive calculated values by successively calculating the required charging time per unit temperature change, and the change in ambient temperature during charging is not remarkable, so that the change is sudden. At the end of charging when the battery temperature rises, the comparison result of the calculated values cancels out the ambient temperature and shows almost only the change amount of the battery temperature.
（ヘ）実施例 以下本考案の実施例を図面に基づき詳細に説明する。(F) Embodiment An embodiment of the present invention will be described below in detail with reference to the drawings.
第１図は本考案の一実施例による充電回路を示すブロッ
ク回路図である。第１図において、（１）は電流供給手
段であり、商用交流（AC）と、該商用交流（AC）の両端
に接続され該商用交流（AC）を直流に変換する電源部
（４）とより成る。（５）は被充電電池であり、その陽
極はスイッチングトランジスタ（６）の主電流路を介し
て前記電源部（４）の＋端子に接続されていると共に、
該電池（５）の陰極は接地されている。また、（２）は
検出手段であって、被充電電池（５）の外装ケースに当
接され、温度検出素子として作用するサーミスタ（７）
と、温度／電圧変換回路（８）及びA/D変換回路（９）
とより構成され、該検出手段（２）の出力はマイクロコ
ンピュータ（10）で構成される演算・制御手段（３）に
入力されている。而して、マイクロコンピュータ（10）
は前記電源部（４）の−端子に接続され、また、他端は
抵抗（11）を介して前記スイッチングトランジスタ
（６）のベースに接続されている。FIG. 1 is a block circuit diagram showing a charging circuit according to an embodiment of the present invention. In FIG. 1, (1) is a current supply means, a commercial alternating current (AC), and a power supply unit (4) connected to both ends of the commercial alternating current (AC) and converting the commercial alternating current (AC) into direct current. Consists of (5) is a battery to be charged, the anode of which is connected to the + terminal of the power supply section (4) through the main current path of the switching transistor (6), and
The cathode of the battery (5) is grounded. Further, (2) is a detection means, which is in contact with the outer case of the battery to be charged (5) and acts as a temperature detection element (7).
And temperature / voltage conversion circuit (8) and A / D conversion circuit (9)
The output of the detection means (2) is input to the arithmetic / control means (3) which is composed of a microcomputer (10). Then, the microcomputer (10)
Is connected to the-terminal of the power supply section (4), and the other end is connected to the base of the switching transistor (6) via a resistor (11).
以上のような構成において、被充電電池（５）はスイッ
チングトランジスタ（６）を介して供給手段（１）から
供給される充電電流により充電される。ここで、第２図
に示すように電池温度は充電末期に急激に増加する。さ
て、今電池の充電を開始すると電池温度は前記検出手段
（２）により温度に比例したディジタル値に変換され前
記演算・制御手段（３）に読み込まれる。一方、演算・
制御手段（３）は入力された電池温度に対して、単位充
電時間当りの温度変化量あるいは単位変化温度当りの充
電所要時間を逐次演算する。電池温度は前記検出手段
（２）により温度に比例したディジタル値に変換され前
記演算・制御手段（３）に読み込まれる。さて、充電が
進行するとやがて電池温度は上昇し、第３図に示す如く
演算・制御手段（３）により、単位温度ΔＴ（℃）だけ
上昇する所要時間tn（ｎ＝１、２、３…）を演算した場
合、充電末期に電池温度は急激に上昇するために所要時
間tnは急激に減少する。即ち、第３図において充電所要
時間t5の経過時点で被充電電池（５）は満充電となり、
この時t5は前回演算した所要時間t4の1/2となってお
り、前記演算・制御手段（３）によりスイッチングトラ
ンジスタ（６）を遮断し、前記供給手段（１）により充
電電流の被充電電池（５）への供給を終了させる。前述
した如く、第３図においてはtn≦tn-1（tn、tn-1は連続
する２つの所要時間）を満足した時充電を制御するもの
であるが、前記演算・制御手段（３）の設定を変更する
ことにより、tn≦tn-1／N1におけるN1を任意の値とする
ことも可能である。In the above configuration, the battery to be charged (5) is charged by the charging current supplied from the supply means (1) via the switching transistor (6). Here, as shown in FIG. 2, the battery temperature rapidly increases at the end of charging. Now, when the charging of the battery is started, the battery temperature is converted into a digital value proportional to the temperature by the detecting means (2) and read into the calculating / controlling means (3). On the other hand,
The control means (3) successively calculates the amount of temperature change per unit charging time or the required charging time per unit changing temperature for the input battery temperature. The battery temperature is converted into a digital value proportional to the temperature by the detection means (2) and read by the calculation / control means (3). Now, as the charging progresses, the battery temperature rises soon, and the required time t n (n = 1, 2, 3, ...) That rises by the unit temperature ΔT (° C.) by the calculation / control means (3) as shown in FIG. ) Is calculated, the battery temperature rises sharply at the end of charging, so the required time t n sharply decreases. That is, in FIG. 3, the charged battery (5) is fully charged when the charging time t 5 has elapsed,
At this time, t 5 is 1/2 of the required time t 4 calculated last time, the switching transistor (6) is cut off by the calculation / control means (3), and the charging current is covered by the supply means (1). The supply to the rechargeable battery (5) is terminated. As described above, in FIG. 3, the charging is controlled when t n ≤t n-1 (t n and t n-1 are two consecutive required times) is satisfied. by changing the settings of (3), it is possible to make the n 1 in the t n ≦ t n-1 / n 1 and an arbitrary value.
また、連続する２つの所要時間の所定差を用いた制御
式、即ち、tn-1−tn≧N2（tn-1、tnは連続する２つの所
要時間、N2は所定値）を満足するするような制御方法も
可能である。ところで、第４図に示す如く単位時間Δｔ
（ｓ）だけ経過したときの上昇温度Tn（ｎ＝１、２、３
…）を演算し、制御式 Tn≧N3Tn-1あるいはTn−Tn-1≧N4（Tn、Tn-1は連続する
２つの単位時間当りの上昇温度、N3、N4は所定値）を満
足するような制御方法も考えられる。しかし、この方法
にあっては、単位時間Δｔ（ｓ）の途中にあっては電池
温度を検出していないため、単位時間途中に急激な温度
上昇が生じても、これを検出することができない。即
ち、この方法は、電池温度を直接検出していないため、
被充電電池の充電状態を正確に検知できるとは必ずしも
言えない。In addition, a control formula using a predetermined difference between two consecutive required times, that is, t n-1 −t n ≧ N 2 (t n-1 , t n are two consecutive required times, N 2 is a predetermined value ) Is also possible. By the way, as shown in FIG. 4, the unit time Δt
Increased temperature T n (n = 1, 2, 3) when only (s) has elapsed
…) To calculate the control equation T n ≧ N 3 T n-1 or T n −T n-1 ≧ N 4 (T n and T n-1 are two consecutive rising temperatures per unit time, N 3 , N 4 is a predetermined value). However, in this method, since the battery temperature is not detected during the unit time Δt (s), even if the temperature rises rapidly during the unit time, it cannot be detected. . That is, since this method does not directly detect the battery temperature,
It cannot always be said that the state of charge of the battery to be charged can be accurately detected.
これに対し、本考案は、電池温度上昇を直接検出してい
るため、如何なる温度変化も確実に検出し、正確に電池
の充電状態を検知することができるものである。On the other hand, the present invention directly detects the temperature rise of the battery, and therefore can reliably detect any temperature change and accurately detect the charge state of the battery.
（ト）考案の効果 本考案は、単位上昇温度当りの充電所要時間を逐次演算
し、連続する２つの演算値を逐次比較することにより電
池の充電状態を検出しており、充電末期に急激に上昇す
る電池温度に対して周囲温度の変化が顕著でないため
に、前述した演算値の比較結果はほぼ電池温度の変化量
のみを示し周囲温度の影響を軽減する。その結果、被充
電電池の正確な充電状態を検知し、過充電あるいは充電
不足を防止することができる。(G) Effect of the Invention The present invention detects the state of charge of the battery by successively calculating the required charging time per unit temperature rise and sequentially comparing two consecutive calculated values. Since the change of the ambient temperature is not remarkable with respect to the rising battery temperature, the comparison result of the above-mentioned calculated values shows almost only the amount of change of the battery temperature and reduces the influence of the ambient temperature. As a result, it is possible to detect the accurate charging state of the battery to be charged and prevent overcharging or insufficient charging.
第１図は本考案を用いた充電回路のブロック回路図、第
２図は電池電圧及び電池温度特性図、第３図は制御説明
図、第４図は参考例としての制御説明図である。 １……供給手段、２……検出手段、３……演算・制御手
段、４……電源部、５……被充電電池、６……スイッチ
ングトランジスタ、７……サーミスタ、８……温度／電
圧変換回路、９……A/D変換回路、10……マイクロコン
ピュータ。FIG. 1 is a block circuit diagram of a charging circuit using the present invention, FIG. 2 is a battery voltage and battery temperature characteristic diagram, FIG. 3 is a control explanatory diagram, and FIG. 4 is a control explanatory diagram as a reference example. 1 ... Supplying means, 2 ... Detecting means, 3 ... Arithmetic / controlling means, 4 ... Power supply section, 5 ... Charged battery, 6 ... Switching transistor, 7 ... Thermistor, 8 ... Temperature / voltage Conversion circuit, 9 ... A / D conversion circuit, 10 ... Microcomputer.
Claims (1)
手段と、充電中の電池温度を検出する検出手段と、単位
変化温度当りの充電所要時間を逐次演算し連続する２つ
の演算値を逐次比較した値が所定値を満足する時に電池
への充電電流を制御する演算・制御手段とより成ること
を特徴とする充電回路。1. A current supply means for supplying a charging current to a battery to be charged, a detection means for detecting a battery temperature during charging, and a time required for charging per unit change temperature are sequentially calculated to obtain two consecutive calculated values. A charging circuit, comprising: an arithmetic / control means for controlling a charging current to a battery when a value obtained by successive comparison satisfies a predetermined value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9262989U JPH0733564Y2 (en) | 1989-08-07 | 1989-08-07 | Charging circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9262989U JPH0733564Y2 (en) | 1989-08-07 | 1989-08-07 | Charging circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0334638U JPH0334638U (en) | 1991-04-04 |
| JPH0733564Y2 true JPH0733564Y2 (en) | 1995-07-31 |
Family
ID=31642043
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9262989U Expired - Lifetime JPH0733564Y2 (en) | 1989-08-07 | 1989-08-07 | Charging circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0733564Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6114839A (en) * | 1997-11-20 | 2000-09-05 | Hitachi Koki Co., Ltd. | Battery charging apparatus with error detection |
-
1989
- 1989-08-07 JP JP9262989U patent/JPH0733564Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0334638U (en) | 1991-04-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |