JPS64909B2 - - Google Patents
Info
- Publication number
- JPS64909B2 JPS64909B2 JP19357381A JP19357381A JPS64909B2 JP S64909 B2 JPS64909 B2 JP S64909B2 JP 19357381 A JP19357381 A JP 19357381A JP 19357381 A JP19357381 A JP 19357381A JP S64909 B2 JPS64909 B2 JP S64909B2
- Authority
- JP
- Japan
- Prior art keywords
- battery
- charging
- switching element
- circuit
- voltage
- 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
Links
- 239000003990 capacitor Substances 0.000 claims description 5
- 229910005580 NiCd Inorganic materials 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004904 shortening Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Description
【発明の詳細な説明】 本発明は、充電回路に係るものである。[Detailed description of the invention] The present invention relates to a charging circuit.
本発明の目的とするところは、電池を使用しき
つた後、再充電を行なう場合に電池劣化を生じる
ことなく短時間に充電できるようにすることにあ
る。 An object of the present invention is to enable a battery to be recharged in a short period of time without deteriorating the battery after it has been used up.
充電式電気ドリルのように、電池を使用しきつ
た後、再充電を行なう場合、電池電圧が低下して
いる状態で行なうため、過大充電電流が流れ、電
池寿命が短かくなるという問題がある。 When recharging a battery after it has run out of use, such as in a rechargeable electric drill, the battery voltage is low, which causes an excessive charging current to flow, shortening the battery's lifespan. .
本発明はかかる点に鑑みてなされたもので、以
下実施例により詳細に説明する。 The present invention has been made in view of this point, and will be explained in detail below with reference to Examples.
第１図において、１はNiCd電池で、スイツチ
ング素子SCRを直列接続し、スイツチング素子
SCRは充電制御回路２の出力と電池１の電圧と
を比較しスイツチング動作を行なつて充電制御を
行なう。充電制御回路２はICにより構成してい
る。３は基準電圧発生回路で、ダイオードD6，
D7の順降下電圧を利用して所定の基準電圧を発
生するようにしてあり、同時にこの基準電圧発生
回路３は電池１に密接配置されて電池１の温度検
出機能を有しており、そのときの電池１の温度に
応じて基準電圧を直線的に変化させるようにして
ある。この基準電圧発生回路３により得た基準電
圧を充電制御回路２内部で増巾し、充電制御回路
２の端子より出力を出し、抵抗R2、ダイオー
ドD3を介してスイツチング素子SCRをトリガす
る。Q2は充電開始時にオンとなりスイツチング
素子SCRをオフするトテンジスタで、充電開始
時に抵抗R10を介してベース電流が流れてオンに
なり、充電制御回路２の端子の出力に関係なく
スイツチング素子SCRをオフにして電池１の充
電を行なわない。つまり、使用しきつた電池１の
電圧が所定電圧に回復するまでの一定時間、スイ
ツチング素子SCRをオフする抵抗R8とコンデン
サC2とからなる時定数回路で遅延手段を構成し、
上記一定時間は電池１の充電を行なわないように
してある。例えば、この電池１を電動ドリルなど
に用い、ドリルの回転数が所定値よりも低下した
というような通常使用状態での放電であれば、電
池１の電圧は30〜60秒程度放置しておくと、その
後スイツチング素子SCRをオンして充電を行つ
ても電池１に過大な充電電流が流れない電圧まで
自然に回復する。しかし、電池１が完全に放電し
きつた状態では、上記電圧まで電池１の電圧が自
然に回復するためには５分程度の時間を要する。
従つて、この時間以内で電池１の充電を行うと、
電池１に過電流が流れて、電池１の寿命を短くし
てしまうのである。そこで、本実施例では上記時
定数回路の時定数を上記５分程度に設定し、この
時間が経過した後に電池１の充電を行うようにし
てある。このため、放電しきつた電池１であつて
も過大な充電電流が流れ、電池寿命が短くなるこ
とがない。そして、抵抗R8を通してコンデンサ
C2が充電され、コンデンサC2の電圧がある値以
上になるとトランジスタQ1がオンになることに
より、トランジスタQ2がオフになる。よつて充
電制御回路２の端子の出力がスイツチング素子
SCRに加わり、スイツチング素子SCRをオンに
して充電電流が流れ、電池１に充電される。尚、
LEDは発光ダイオードで、充電中に点灯するも
のである。即ち、電池１の充電中は整流回路４の
出力電圧が低く、充電が終了すると整流回路４の
出力電圧が高くなることを利用し、充電制御回路
２でこの電圧変化を検出し、充電中に発光ダイオ
ードLEDを点灯する。第２図は充電制御回路２
の一例の具体回路図で、端子〜は第１図にお
ける各端子〜に対応したものである。 In Figure 1, 1 is a NiCd battery, with a switching element SCR connected in series, and a switching element SCR connected in series.
The SCR compares the output of the charging control circuit 2 with the voltage of the battery 1 and performs a switching operation to control charging. The charging control circuit 2 is composed of an IC. 3 is a reference voltage generation circuit, which includes a diode D 6 ,
A predetermined reference voltage is generated using the forward voltage drop of D 7 , and at the same time, this reference voltage generation circuit 3 is placed closely to the battery 1 and has a temperature detection function of the battery 1. The reference voltage is changed linearly according to the temperature of the battery 1 at the time. The reference voltage obtained by this reference voltage generation circuit 3 is amplified inside the charge control circuit 2, outputted from the terminal of the charge control circuit 2, and triggered the switching element SCR via the resistor R 2 and the diode D 3 . Q 2 is a resistor that turns on when charging starts and turns off switching element SCR. When charging starts, the base current flows through resistor R 10 and turns on, turning off switching element SCR regardless of the output of the terminal of charging control circuit 2. Turn it off and do not charge battery 1. That is, the delay means is constituted by a time constant circuit consisting of a resistor R8 and a capacitor C2 , which turns off the switching element SCR for a certain period of time until the voltage of the exhausted battery 1 recovers to a predetermined voltage.
The battery 1 is not charged during the above-mentioned certain period of time. For example, if this battery 1 is used in an electric drill, etc., and the drill's rotational speed drops below a predetermined value, the voltage of battery 1 should be left for about 30 to 60 seconds. Then, even if the switching element SCR is turned on and charging is performed, the voltage naturally recovers to such a level that no excessive charging current flows into the battery 1. However, when the battery 1 is completely discharged, it takes about 5 minutes for the voltage of the battery 1 to naturally recover to the above voltage.
Therefore, if battery 1 is charged within this time,
An overcurrent flows through the battery 1, shortening its lifespan. Therefore, in this embodiment, the time constant of the time constant circuit is set to about 5 minutes, and the battery 1 is charged after this time has elapsed. Therefore, even if the battery 1 is fully discharged, an excessive charging current will not flow and the battery life will not be shortened. And the capacitor through the resistor R 8
When C 2 is charged and the voltage of capacitor C 2 exceeds a certain value, transistor Q 1 is turned on and transistor Q 2 is turned off. Therefore, the output of the terminal of charging control circuit 2 is a switching element.
SCR, switching element SCR is turned on, a charging current flows, and battery 1 is charged. still,
LED is a light emitting diode that lights up while charging. That is, the output voltage of the rectifier circuit 4 is low while charging the battery 1, and the output voltage of the rectifier circuit 4 increases when charging is completed.The charging control circuit 2 detects this voltage change and Light up the light emitting diode LED. Figure 2 shows charging control circuit 2.
This is a specific circuit diagram of an example, and the terminals correspond to the terminals in FIG. 1.
上述のように本発明は、NiCd電池に直列接続
してこの電池への充電電流の入切をするスイツチ
ング素子と、基準電圧発生回路の出力に基いて出
力を出し前記スイツチング素子を制御する充電制
御回路とを有する充電回路において、充電開始時
から使用しきつた電池の電圧が所定電圧まで回復
する一定時間後に前記スイツチング素子をオンす
る遅延手段を設けてあるので、電池を使用しきつ
た後、再充電を行なう場合にも、遅延手段により
スイツチング素子がオンされるまでは、充電を行
なわずに、過大な充電電流が電池に流れなくなる
まで待つことができ、その後電池の充電を行なう
ので、電池に過大な充電電流が流れて、電池の寿
命が短くなることがない効果がある。しかも、過
大な充電電流が電池に流れなくなるまで電池の電
圧が回復した後は、急速充電することも可能であ
るので、充電時間も短くできる。 As described above, the present invention includes a switching element that is connected in series with a NiCd battery to turn charging current on and off to the battery, and a charging control device that outputs an output based on the output of a reference voltage generation circuit and controls the switching element. In the charging circuit having a charging circuit, a delay means is provided to turn on the switching element after a certain period of time after the voltage of the used battery recovers to a predetermined voltage from the start of charging, so that after the battery is used up, Even when recharging, charging is not performed until the switching element is turned on by the delay means, and it is possible to wait until excessive charging current no longer flows to the battery, and then the battery is charged. This has the effect of preventing excessive charging current from flowing and shortening the battery life. Furthermore, after the voltage of the battery has been recovered until an excessive charging current no longer flows through the battery, rapid charging can be performed, so that the charging time can also be shortened.
第１図は本発明の一実施例の回路図、第２図は
同上の充電制御回路の具体回路図である。
１…電池、２…充電制御回路、３…基準電圧発
生回路、SCR…スイツチング素子、R8…抵抗、
C2…コンデンサ。
FIG. 1 is a circuit diagram of an embodiment of the present invention, and FIG. 2 is a specific circuit diagram of the same charging control circuit. 1...Battery, 2...Charging control circuit, 3...Reference voltage generation circuit, SCR...Switching element, R8 ...Resistor,
C2 ...Capacitor.
Claims (1)
電流の入切をするスイツチング素子と、基準電圧
発生回路の出力に基いて出力を出し前記スイツチ
ング素子を制御する充電制御回路とを有する充電
回路において、充電開始時から使用しきつた電池
の電圧が所定電圧まで回復する一定時間後に前記
スイツチング素子をオンする遅延手段を設けて成
ることを特徴とする充電回路。 ２ 上記遅延手段を抵抗とコンデンサとからなる
時定数回路で構成して成ることを特徴とする特許
請求の範囲第１項記載の充電回路。[Scope of Claims] 1. A switching element that is connected in series to a NiCd battery and turns on/off charging current to the battery, and a charging control circuit that outputs an output based on the output of a reference voltage generation circuit and controls the switching element. 1. A charging circuit comprising: a delay means for turning on said switching element after a certain period of time from the start of charging until the voltage of a used battery recovers to a predetermined voltage. 2. The charging circuit according to claim 1, wherein the delay means is constituted by a time constant circuit consisting of a resistor and a capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19357381A JPS5895947A (en) | 1981-11-30 | 1981-11-30 | Charging circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19357381A JPS5895947A (en) | 1981-11-30 | 1981-11-30 | Charging circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5895947A JPS5895947A (en) | 1983-06-07 |
| JPS64909B2 true JPS64909B2 (en) | 1989-01-09 |
Family
ID=16310250
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19357381A Granted JPS5895947A (en) | 1981-11-30 | 1981-11-30 | Charging circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5895947A (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53139521U (en) * | 1977-04-08 | 1978-11-04 |
-
1981
- 1981-11-30 JP JP19357381A patent/JPS5895947A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5895947A (en) | 1983-06-07 |
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