JPS59204432A - Dc power source system - Google Patents
Dc power source systemInfo
- Publication number
- JPS59204432A JPS59204432A JP58077603A JP7760383A JPS59204432A JP S59204432 A JPS59204432 A JP S59204432A JP 58077603 A JP58077603 A JP 58077603A JP 7760383 A JP7760383 A JP 7760383A JP S59204432 A JPS59204432 A JP S59204432A
- Authority
- JP
- Japan
- Prior art keywords
- switch
- circuit
- conversion circuit
- charging
- value
- 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.)
- Granted
Links
- 238000009423 ventilation Methods 0.000 description 24
- 238000006243 chemical reaction Methods 0.000 description 16
- 239000007789 gas Substances 0.000 description 9
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000004880 explosion Methods 0.000 description 6
- 239000002253 acid Substances 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 235000006693 Cassia laevigata Nutrition 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 241000735631 Senna pendula Species 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 229940124513 senna glycoside Drugs 0.000 description 1
Classifications
-
- 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
Landscapes
- Gas Exhaust Devices For Batteries (AREA)
- Control Of Electrical Variables (AREA)
- Continuous-Control Power Sources That Use Transistors (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
本発明は、蓄電池充電中の発生ガス排出のための換気扇
運転において、換気扇が正常に運転しない時には蓄電池
の充電を停止するようにした直流ｉ１システムに関する
ものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a DC i1 system in which charging of a storage battery is stopped when the ventilation fan does not operate normally during operation of a ventilation fan to discharge gas generated during charging of a storage battery.
一般に無停電の直流を必要とする通信用設備等に対して
は、通常商用交流を入力とする整流器および蓄電池から
構成される直流電源システムにより直流電力を供給する
。このシステムでは、整流器により蓄電池の自己放電を
補う充電（浮動充電）を行いつつ、負荷に電力を供給し
、停電により整流器が停止した時には、蓄電池から電力
を供給する。蓄電池には通常鉛蓄電池が使用されるが、
充電時、特に組電池を構成する各鉛蓄電池間のアンバラ
ンスを是正するために行う均等充電及び放電量に見合う
充電を行５ための同腹充電の末期には鉛蓄電池電解液の
電気分解により、多量の水素。In general, communication equipment that requires uninterrupted DC power is supplied with DC power by a DC power supply system consisting of a rectifier and a storage battery that normally receives commercial AC as input. In this system, power is supplied to the load while a rectifier performs charging to compensate for self-discharge of the storage battery (floating charge), and when the rectifier stops due to a power outage, power is supplied from the storage battery. Lead-acid batteries are usually used as storage batteries, but
At the time of charging, in particular, in the final stage of equal charging to correct the imbalance between the lead-acid batteries that make up the assembled battery and charge commensurate with the amount of discharge, electrolysis of the lead-acid battery electrolyte is carried out. A lot of hydrogen.
酸素ガスが発生する。水素ガスは濃度が濃くなり火花が
あれば爆発に至る危険性があるため、ガスが室内に充満
しないように、換気扇を設置する必要があり、これは直
流電源システムにとって不可欠である。Oxygen gas is generated. Because hydrogen gas can become so concentrated that a spark can lead to an explosion, it is necessary to install a ventilation fan to prevent the gas from filling the room, which is essential for DC power systems.
第１図は、換気扇を含む従来の直流電源システムを示す
ブロック図であり、１は商用電源、２は商用電源からの
入力を整流し一定の直流電圧を出力するためのＡＣ−Ｄ
Ｃ変換回路、３はＡＣ−ＤＣ変換回路２の出力と成る基
準値を比較しＡＣ−ＤＣ変換回路２の出力を一定に保つ
ための、図示せざる誤差増幅器を含む制御回路、４は充
電信号発生回路、５は充電信号発生回路４の信号により
動作するスイッチ、６はＡＣ−ＤＣ変換回路２゜制御回
路３．充電信号発生回路４．スイッチ５よりなる整流器
、７は複数の鉛蓄電池を直列接続した組電池、８は負荷
、９は充電信号発生回路４の信号により動作するスイッ
チ、１０は換気扇である。FIG. 1 is a block diagram showing a conventional DC power supply system including a ventilation fan, in which 1 is a commercial power supply, and 2 is an AC-D for rectifying the input from the commercial power supply and outputting a constant DC voltage.
C conversion circuit; 3 is a control circuit including an error amplifier (not shown) for comparing the output of the AC-DC conversion circuit 2 with a reference value and keeping the output of the AC-DC conversion circuit 2 constant; 4 is a charging signal; generation circuit; 5, a switch operated by a signal from the charging signal generation circuit 4; 6, an AC-DC conversion circuit; 2° control circuit; 3. Charging signal generation circuit 4. A rectifier consisting of a switch 5, 7 a battery pack in which a plurality of lead-acid batteries are connected in series, 8 a load, 9 a switch operated by a signal from the charging signal generating circuit 4, and 10 a ventilation fan.
このシステムは前述のように商用電源１を入力とする整
流器６により組電池７を浮動充電しつつ、゛ 負荷８
に電力を供給する。組電池７の各電池間の特性上のアン
バランスを是正すのための均等充電を行う際には、充電
信号発生回路４からの信号でスイッチ５を動作させるこ
とにより、制御回路３内の基準電圧を変化させ、ＡＣ−
ＤＣ変換回路２の出力電圧を上げて、浮動充電電圧より
高めの電圧により均等充電を行う。この時換気扇１０は
充電信号発生回路４からの信号によりスイッチ９が動作
することにより動作し、均等充電時に発生するガスが室
内に充満しないように外部に排出する。As described above, this system floatingly charges the assembled battery 7 using the rectifier 6 that receives the commercial power supply 1 as input, and
to supply power. When performing equal charging to correct the unbalance in characteristics between each battery in the assembled battery 7, the reference in the control circuit 3 is activated by operating the switch 5 with a signal from the charging signal generation circuit 4. Change the voltage, AC-
The output voltage of the DC conversion circuit 2 is increased to perform equal charging at a voltage higher than the floating charging voltage. At this time, the ventilation fan 10 is operated by operating the switch 9 in response to a signal from the charging signal generating circuit 4, and exhausts the gas generated during equal charging to the outside so that it does not fill the room.
通常の浮動運転中はガスの発生量が少なく爆発に至るこ
とはないので充電信号発生回路４より信号が発出されな
いため、スイッチ９は不動作となり換気扇１０は動作し
ない。During normal floating operation, the amount of gas generated is small and will not cause an explosion, so no signal is issued from the charging signal generation circuit 4, so the switch 9 is inoperative and the ventilation fan 10 is not operated.
従来の直流電源システムはこのような構成をとっている
ため、換気扇１０が故障し、不動作となっている場合に
も、充電信号発生回路４の信号に部に排出できず、室内
にガスが充満し爆発を起こす危険性があるという問題が
あった。Because the conventional DC power supply system has such a configuration, even if the ventilation fan 10 is malfunctioning and is not operating, the signal from the charging signal generation circuit 4 cannot be used to discharge gas into the room. There was a problem that there was a risk of the tank becoming full and causing an explosion.
本発明は、上述のような従来技術の問題点を解決するた
めになされたものであり、従って本発明の目的は、換気
扇が不動作のときには均等充電等を実施せず、従ってガ
ス発生ひいてはその爆発の危険性が生じ得ないようにし
た直流電源システムを提供することにある。The present invention has been made in order to solve the problems of the prior art as described above, and therefore, the purpose of the present invention is to prevent equal charging etc. from being performed when the ventilation fan is not operating, thereby preventing gas generation and its It is an object of the present invention to provide a DC power supply system that does not pose the risk of explosion.
本発明の構成の要点は、商用電源を入力としてその出力
で電池を浮動充電しつつ負荷に電力を供給するＡＣ−Ｄ
Ｃ変換回路と、該変換回路の出力電圧を検出して成る基
準値と比較し、その差が零になるよさに前記変換回路を
制御する制御回路と、該回路から充電信号が出力される
と、前記基準値をそれまでの第１の値から第２の値に設
定変更すると共に１それにより前記変換回路からそれま
でとは異なった値で出力される出力電圧で電池が充電さ
れることにより発生するガスを排出するための換気装置
を起動する手段とを有して成る直流電源システムにおい
て、前記換気装置が動作状態にあるか否かを検出する検
出手段を備え、換気装置が動作状態にないときは前記基
準値の設定変更を行なわないようにした点にある。The main point of the configuration of the present invention is that the AC-D
a C conversion circuit, a control circuit that compares the output voltage of the conversion circuit with a reference value and controls the conversion circuit to such an extent that the difference becomes zero; , the setting of the reference value is changed from the first value to the second value, and the battery is charged with an output voltage outputted from the conversion circuit at a value different from that before. A DC power supply system comprising a means for starting a ventilation device for discharging generated gas, comprising a detection means for detecting whether the ventilation device is in an operating state, and a detection means for detecting whether the ventilation device is in an operating state. The point is that the setting of the reference value is not changed when there is no such value.
次に図を参照１２て本発明の一実施例を説明するゎ第２
図は本発明の一実施例を示すブロック図であって、第１
図におけるのと同一番号のものは同じものを示す。１１
は換気扇１０が正常に動作しているかどうかを検出する
センサ、１２は該センサ１１からの信号を受けて動作す
るスイッチである。Next, an embodiment of the present invention will be explained with reference to the drawings.
The figure is a block diagram showing one embodiment of the present invention.
The same numbers as in the figures indicate the same things. 11
A sensor 12 detects whether the ventilation fan 10 is operating normally, and a switch 12 operates in response to a signal from the sensor 11.
この直流電源システムの浮動充電、停電時の動作は第１
図に示す従来の直流電源システムのそれと同様であるの
で、本発明の関係する均等充電時の動作について説明す
る。The floating charging of this DC power supply system and its operation during power outages are the first
Since it is similar to that of the conventional DC power supply system shown in the figure, the operation during equal charging to which the present invention relates will be explained.
充電信号発生回路４から信号が発出している時にはスイ
ッチ５．スイッチ９が動作し、換気扇１０が正常ならば
、センサ１１からの信号を受はスイッチ１２が動作する
ことにより、制御回路３内の基準電圧が変化し、ＡＣ−
ＤＣ変換回路２の出力電圧が高くなり、均等充電が行わ
れる。この時は、換気扇１０が動作しているので均等充
電中のガスは換気扇１０により排出され、爆発に至る危
険性はない。When a signal is being generated from the charging signal generation circuit 4, the switch 5. If the switch 9 operates and the ventilation fan 10 is normal, the switch 12 receives the signal from the sensor 11 and changes the reference voltage in the control circuit 3, causing the AC-
The output voltage of the DC conversion circuit 2 becomes high, and equal charging is performed. At this time, since the ventilation fan 10 is operating, the gas being evenly charged is exhausted by the ventilation fan 10, and there is no danger of an explosion.
換気扇１０が何らかの原因による故障で不動作の時には
センサ１１からの信号が発出されないため、スイッチ１
２が不動作となり、制御回路３内の基準電圧が変化しな
いため、ＡＣ−ＤＣ変換回路２の出力は高くならず一均
等充電は行われず、浮動充電状態が維持される。したが
って、本発明による直流電源システムでは、換気扇が何
らかの原因で不動作の時は、これを検出して均等充電を
実施しないという制御動作を実現できる。When the ventilation fan 10 is inoperable due to a failure for some reason, the sensor 11 does not output a signal, so the switch 1
2 becomes inoperative and the reference voltage within the control circuit 3 does not change, so the output of the AC-DC conversion circuit 2 does not become high, uniform charging is not performed, and a floating charging state is maintained. Therefore, in the DC power supply system according to the present invention, when the ventilation fan is not operating for some reason, it is possible to realize a control operation in which this is detected and equal charging is not performed.
なお、換気扇１０が正常に動作しているかどうかを検出
するセンサ１１としては、換気扇の回転を検出するもの
、風量を検出するもの、空気の流れによる温度変化を検
出するもの、風圧を検出するもの等積々のセンナがある
。また、センサ１１とスイッチ１２の各機能を１つの機
能としてまとめた回路素子なども考えられる。The sensors 11 that detect whether the ventilation fan 10 is operating normally include one that detects rotation of the ventilation fan, one that detects air volume, one that detects temperature changes due to air flow, and one that detects wind pressure. There is an equal amount of senna. Further, a circuit element that combines the functions of the sensor 11 and the switch 12 into one function may also be considered.
第３図および第４図は、制御回路３内の誤差増幅器１３
とスイッチ５．スイッチ１２との具体的な結線例を示す
回路図であり、第３図では抵抗値が各々Ｒ１，ｉｔ、
Ｒ３の抵抗１４，１５，１６を直列に接続した回路の両
端にＡＣ−ＤＣ変換回路２の出力を接続し、抵抗１４と
抵抗１５の接続点を誤差増幅器１３の←）入力に接続し
、誤差増幅器１３の（ト）入力に基準電圧Ｅの基壁電圧
源１７を接続する。3 and 4 show the error amplifier 13 in the control circuit 3.
and switch 5. 3 is a circuit diagram showing a specific example of connection with the switch 12, and in FIG. 3, the resistance values are R1, it, and R1, respectively.
The output of the AC-DC conversion circuit 2 is connected to both ends of a circuit in which resistors 14, 15, and 16 of R3 are connected in series, and the connection point between the resistors 14 and 15 is connected to the ←) input of the error amplifier 13. A base wall voltage source 17 of a reference voltage E is connected to the (g) input of the amplifier 13.
さらに、スイッチ５とスイッチ１２の直列回路を抵抗１
５０両端に接続し、均等充電時に抵抗１５を短終するよ
う構成する。ＡＣ−ＤＣ変換回路２の出力電圧を浮動充
電時Ｖ１ 均等充電時Ｖ２（Ｖｚ＞Ｖｌ）とすると、次
の関係式が成り立つ、（Ｒ２＋Ｒ３）Ｖｔ”（Ｒｔ＋Ｒ
２＋Ｒｓ ）Ｅ ＝・（１）ＲａＶｚ＝（Ｒ１＋Ｉｈ）
Ｅ ・・・・・・（２）（２）式から
、”、Ｒｓ＝Ｅ−Ｉｈ／（Ｖｚ−Ｅ） ・・
・・−（３）が求まり、（３）式を（１１式に代入して
Ｒ２を求めると、次のようになる。Furthermore, the series circuit of switch 5 and switch 12 is connected to resistor 1
50, and the resistor 15 is configured to be short-terminated during equal charging. Assuming that the output voltage of the AC-DC conversion circuit 2 is V1 during floating charging and V2 during equal charging (Vz>Vl), the following relational expression holds true: (R2+R3)Vt''(Rt+R
2+Rs)E=・(1)RaVz=(R1+Ih)
E...(2) From formula (2), ", Rs=E-Ih/(Vz-E)...
...-(3) is found, and when R2 is found by substituting equation (3) into equation (11), the following is obtained.
、’、Ｒ２−Ｅ（Ｖｚ−Ｖｌ ）Ｒ１／（Ｖｌ−Ｅ）（
Ｖｚ−Ｅ）・・・・・・（４）
抵抗１５．１６を各々（４）式、（３）式で求めた値と
し、第３図のように接続することにより、均等充電を行
う時には、充電信号発生回路４からの信号によりスイッ
チ５が動作するとともにスイッチ９（第２図参照）が動
作し、換気扇１０が運転する。,',R2-E(Vz-Vl)R1/(Vl-E)(
Vz-E)... (4) When performing equal charging by setting the resistors 15 and 16 to the values obtained from equations (4) and (3), and connecting them as shown in Figure 3, , the switch 5 is operated by a signal from the charging signal generating circuit 4, and the switch 9 (see FIG. 2) is also operated, and the ventilation fan 10 is operated.
換気扇１０の正常運転をセンサ１１が検出し、スイッチ
１２を動作させる。スイッチ５及びスイッチ１２が動作
すると抵抗１５が短絡され、ＡＣ−ＤＣ変換回路２の出
力を均等充電電圧■２とするように誤差増幅器１３を動
作させることができる。A sensor 11 detects normal operation of the ventilation fan 10 and operates a switch 12. When the switch 5 and the switch 12 operate, the resistor 15 is short-circuited, and the error amplifier 13 can be operated so that the output of the AC-DC conversion circuit 2 is equalized to the equal charging voltage 2.
また、第４図では、基準電圧Ｅを抵抗値が各々Ｒ４，Ｒ
５の抵抗１８，１９により分圧し、抵抗１８と抵抗１９
の接続点を誤差増幅器１３の（ト）入力に接続し、スイ
ッチ５及びスィッチ１２動作時に抵抗１８を短絡し、誤
差増幅器１３の（（１）入力に基準電圧を印加する構成
であり、誤差増幅器１３の（ハ）入力はＡＣ−ＤＣ変換
回路２の出力を分圧する抵抗１４，１６の接続点に接続
する。抵抗１８の値はＲ４＝（Ｖｚ−Ｖｔ）ＩＩｓ／Ｖ
ｔとする必要がある。In addition, in FIG. 4, the reference voltage E is set to the resistance values R4 and R, respectively.
Voltage is divided by resistors 18 and 19 of 5, and resistor 18 and resistor 19
The connection point is connected to the (G) input of the error amplifier 13, the resistor 18 is short-circuited when the switch 5 and the switch 12 are operated, and a reference voltage is applied to the (1) input of the error amplifier 13. The (c) input of 13 is connected to the connection point of resistors 14 and 16 that divides the output of the AC-DC conversion circuit 2.The value of the resistor 18 is R4=(Vz-Vt)IIs/V
It is necessary to set it to t.
なお、本実施例ではスイッチ５．スイッチ９゜スイッチ
１２は機械的スイッチで構成されるもの−９−、。In this embodiment, switch 5. Switch 9゜Switch 12 is composed of a mechanical switch -9-.
として図示しているが、トランジスタ等を用いた電気的
スイッチでも構成でき、機械的スイッチに限らない。Although shown in the figure, it can also be configured with an electrical switch using a transistor or the like, and is not limited to a mechanical switch.
以上説明したように、本発明によれば換気扇不動作の状
態で均等充電を実施することはないので、蓄電池から発
生する多針のガスが室内に充満し爆発するどい５危険性
をなくすことができる。As explained above, according to the present invention, equal charging is not performed when the ventilation fan is not operating, so it is possible to eliminate the risk of explosion due to multi-needle gas generated from the storage battery filling the room. .
第１図は従来の直流電源システムを示すブロック図、第
２図は本発明の一実施例を示すブロック図、第３図、第
４図はそれぞれ第２図の制御回路内の誤差増幅器の一配
綜例を示した回路図、である。
符号説明
１・−・・・・商用交流電源、２・・・・・・ＡＣ−Ｄ
Ｃ変換回路、３・・・・・・制御回路、４・・・・・・
充電信号発生回路。
５・・・・・・スイッチ、６・・・・・・整流器、７・
・・・・・ｍ電池。
８−・・・・・負荀、９・−・・・・スイッチ、１０・
曲・換気扇。
１１・・・・・・センサ、１２・・・・・・スイッチ、
１３・・・・・・誤差増幅器、１４，１５，１６．・・
・・・・抵抗、１７・・・・・・１０−
基準電圧源、１８．１９・・・・・・抵抗−１１−FIG. 1 is a block diagram showing a conventional DC power supply system, FIG. 2 is a block diagram showing an embodiment of the present invention, and FIGS. 3 and 4 are one example of an error amplifier in the control circuit shown in FIG. FIG. 3 is a circuit diagram showing an example of arrangement. Code explanation 1...Commercial AC power supply, 2...AC-D
C conversion circuit, 3... Control circuit, 4...
Charging signal generation circuit. 5... Switch, 6... Rectifier, 7.
...m battery. 8-...Negative Xun, 9--...Switch, 10.
Music/ventilation fan. 11...Sensor, 12...Switch,
13...Error amplifier, 14, 15, 16.・・・
...Resistance, 17...10- Reference voltage source, 18.19...Resistance -11-
Claims (1)
つつ負荷に電力を供給するＡＣ−ＤＣ変換回路と、該変
換回路の出力電圧を検出して成る基準値と比較し、その
差が零になるように前記変換回路を制御する制御回路と
、充電信号発生回路と、該回路から充電信号が出力され
ると、前記基準値をそれまでの第１の値から第２の値に
設定変更すると共に、それにより前記変換回路からそれ
までとは異なった値で出力される出力電圧で電池が充電
されることにより発生するガスを排出するための換気装
置を起動する手段とを有して成る直流電源システムにお
いて、前記換気装置が動作状態にあるか否かを検出する
検出手段を備え、換気装置が動作状態にないときは前記
基準値の設定変更を行なわないようにしたことを特徴と
する直流電源システム。 １−[Claims] 1) Comparison of an AC-DC conversion circuit that receives a commercial power source as an input and supplies power to a load while floatingly charging a battery with its output, and a reference value obtained by detecting the output voltage of the conversion circuit. and a control circuit that controls the conversion circuit so that the difference becomes zero, and a charge signal generation circuit, and when the charge signal is output from the circuit, the reference value is changed from the previous first value to the first value. means for changing the setting to a value of 2 and thereby activating a ventilation device for exhausting gas generated when the battery is charged with an output voltage outputted from the conversion circuit at a value different from that before. A DC power supply system comprising: a detection means for detecting whether or not the ventilation device is in an operating state, and the setting of the reference value is not changed when the ventilation device is not in an operating state. A DC power supply system characterized by: 1-
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58077603A JPS59204432A (en) | 1983-05-04 | 1983-05-04 | Dc power source system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58077603A JPS59204432A (en) | 1983-05-04 | 1983-05-04 | Dc power source system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59204432A true JPS59204432A (en) | 1984-11-19 |
| JPH0417019B2 JPH0417019B2 (en) | 1992-03-25 |
Family
ID=13638508
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58077603A Granted JPS59204432A (en) | 1983-05-04 | 1983-05-04 | Dc power source system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59204432A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0284023A (en) * | 1988-09-19 | 1990-03-26 | Nippon Telegr & Teleph Corp <Ntt> | Battery monitor/controller |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57166275A (en) * | 1981-04-07 | 1982-10-13 | Tokyo Shibaura Electric Co | Controller for ventilation of elevator machine chamber |
-
1983
- 1983-05-04 JP JP58077603A patent/JPS59204432A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57166275A (en) * | 1981-04-07 | 1982-10-13 | Tokyo Shibaura Electric Co | Controller for ventilation of elevator machine chamber |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0284023A (en) * | 1988-09-19 | 1990-03-26 | Nippon Telegr & Teleph Corp <Ntt> | Battery monitor/controller |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0417019B2 (en) | 1992-03-25 |
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