JP3045748B2 - Power supply switching method - Google Patents
Power supply switching methodInfo
- Publication number
- JP3045748B2 JP3045748B2 JP2190485A JP19048590A JP3045748B2 JP 3045748 B2 JP3045748 B2 JP 3045748B2 JP 2190485 A JP2190485 A JP 2190485A JP 19048590 A JP19048590 A JP 19048590A JP 3045748 B2 JP3045748 B2 JP 3045748B2
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- switching
- circuit
- thyristor
- gate
- 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
Description
【発明の詳細な説明】 ［産業上の利用分野］ この発明は、電源切り換え方法、特に無停電電源装置
などにおける常用電源と予備電源を切り換える電源切り
換え方法に関するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply switching method, and more particularly to a power supply switching method for switching between a normal power supply and a standby power supply in an uninterruptible power supply or the like.
［従来の技術］ 第３図は例えば雑誌OHMの1984年12月号第22〜24ペー
ジに開示されたような従来の電源切り換え方法を説明す
る回路図を示し、図において（１）は常用電源、（２）
は予備電源、（３）はこれら常用電源（１）と予備電源
（２）を切り換える切り換え回路、（11）は常用電源
（１）中のインバータ、（12）は常用電源（１）中に設
けられてその故障を検出する故障検出回路、（13）は常
用電源（１）中の制御電源、（14）は故障検出回路（1
2）に接続された故障信号伝送用トランジスタ、（3
1），（32）は切り換え回路（３）中でそれぞれインバ
ータ（11）、予備電源（２）と負荷の間に接続された電
源切り換え用サイリスタ、（33）はこれらサイリスタ
（31），（32）に接続されて交互にON/OFFさせる切り換
えロジック回路、そして（34）は入力側が制御電源（1
3）とトランジスタ（14）の間に接続されかつ出力側が
切り換えロジック回路（33）に接続されたフォトカプラ
である。[Prior Art] FIG. 3 is a circuit diagram for explaining a conventional power supply switching method as disclosed in, for example, pages 22 to 24 of the magazine OHM, December 1984. In FIG. , (2)
Is a standby power supply, (3) is a switching circuit for switching between the standby power supply (1) and standby power supply (2), (11) is an inverter in the standby power supply (1), and (12) is provided in the standby power supply (1). (13) is a control power supply in the normal power supply (1), and (14) is a failure detection circuit (1).
The fault signal transmission transistor connected to (2), (3
1) and (32) are thyristors for switching the power supply connected between the inverter (11) and the standby power supply (2) and the load in the switching circuit (3), respectively, and (33) is a thyristor for these thyristors (31) and (32). ) Is connected to the switching logic circuit to turn on and off alternately, and (34) is the control power supply (1
The photocoupler is connected between 3) and the transistor (14), and the output side is connected to the switching logic circuit (33).
次に第４図のタイムチャート図を参照しながら、第３
図の回路動作を説明する。常用電源（１）の正常運転時
には、故障検出回路（12）が故障を検出しないのでトラ
ンジスタ（14）はOFFのまゝであり、従ってフォトカプ
ラ（34）は切り換えロジック回路（33）へどんな信号も
送らない。この状態では、サイリスタ（31）がON、サイ
リスタ（32）がOFFに制御され、負荷へは常用電源から
給電される。しかしながら、常用電源（１）の故障時に
は、故障検出回路（12）がトランジスタ（14）をONにす
ることにより、フォトカプラ（34）から切り換えロジッ
ク回路（33）に信号が送られ、これにより切り換えロジ
ック回路（33）はサイリスタ（31）をON→OFF、サイリ
スタ（32）をOFF→ONに制御する。そのため、負荷は予
備電源（２）から給電されることになる。Next, referring to the time chart of FIG.
The circuit operation in the figure will be described. During normal operation of the commercial power supply (1), the transistor (14) remains OFF because the failure detection circuit (12) does not detect a failure, and therefore the photocoupler (34) sends any signal to the switching logic circuit (33). Do not send In this state, the thyristor (31) is controlled to be ON and the thyristor (32) is controlled to be OFF, and power is supplied to the load from the commercial power supply. However, when the service power supply (1) fails, a signal is sent from the photocoupler (34) to the switching logic circuit (33) by the failure detection circuit (12) turning on the transistor (14). The logic circuit (33) controls the thyristor (31) from ON to OFF, and controls the thyristor (32) from OFF to ON. Therefore, the load is supplied with power from the standby power supply (2).
［発明が解決しようとする課題］ 従来の電源切り換え方法では、常用電源内の制御電源
喪失時には、予備電源への切り換えを指令する信号を伝
送することができないし、また誤操作などにより常用電
源が停止した場合にも予備電源へ切り換えることができ
ないという問題点があつた。[Problems to be Solved by the Invention] In the conventional power supply switching method, when the control power supply in the commercial power supply is lost, a signal for instructing switching to the backup power supply cannot be transmitted, and the commercial power supply is stopped due to an erroneous operation or the like. In such a case, there is a problem that it is not possible to switch to the standby power supply.
この発明は、このような問題点を解決するためになさ
れたもので、常用電源内の制御電源が喪失した場合や誤
操作などにより常用電源が停止した場合にも確実に予備
電源への切り換えができる電源切り換え方法を得ること
を目的とする。The present invention has been made in order to solve such a problem, and it is possible to reliably switch to the standby power supply even when the control power supply in the normal power supply is lost or when the normal power supply is stopped due to an erroneous operation. It is intended to obtain a power supply switching method.
［課題を解決するための手段］ この発明に係る電源切り換え方法は、常用電源と予備
電源を切り換える切り換え回路を用いた電源切り換え方
法において、前記常用電源は、インバータと、常用電源
の故障を検出する故障検出回路と、制御電源と、故障信
号伝送用トランジスタと、前記故障検出回路と前記故障
信号伝送用トランジスタの間に接続されたANDゲートと
を備え、前記切り換え回路は、前記インバータと負荷の
間に接続された第１の電源切り換え用サイリスタと、前
記予備電源と前記負荷の間に接続された第２の電源切り
換え用サイリスタと、前記第１及び第２の電源切り換え
用サイリスタに接続されて交互にON/OFFさせる切り換え
ロジック回路と、入力側が前記制御電源と前記故障信号
伝送用トランジスタの間に接続されかつ出力側が前記切
り換えロジック回路に接続されたフォトカプラとを備
え、前記常用電源の正常連転時には、前記常用電源が運
転中であることを示す常用電源運転信号が前記ANDゲー
トの非反転入力端子に印加され、かつ故障検出信号が前
記ANDゲートの反転入力端子に印加されず、前記ANDゲー
トは前記故障信号伝送用トランジスタをターンオンさ
せ、前記フォトカプラから前記切り換えロジック回路へ
信号が送られ、前記切り換えロジック回路は前記第１の
電源切り換え用サイリスタをON、前記第２の電源切り換
え用サイリスタをOFFに制御して前記常用電源へ切り換
え、前記常用電源の故障時には、前記故障検出信号が前
記ANDゲートの反転入力端子に印加され、前記常用電源
の停止時には、前記常用電源運転信号が前記ANDゲート
の非反転入力端子に印加されず、いずれの場合も前記AN
Dゲートは前記故障信号伝送用トランジスタをターンオ
フさせ、前記フォトカプラから前記切り換えロジック回
路へ信号が送られず、前記切り換えロジック回路は前記
第１の電源切り換え用サイリスタをOFF、前記第２の電
源切り換え用サイリスタをONに制御して前記予備電源へ
切り換えるものである。[Means for Solving the Problems] A power supply switching method according to the present invention is a power supply switching method using a switching circuit for switching between a regular power supply and a standby power supply, wherein the regular power supply detects an inverter and a failure of the regular power supply. A failure detection circuit, a control power supply, a failure signal transmission transistor, and an AND gate connected between the failure detection circuit and the failure signal transmission transistor, wherein the switching circuit is provided between the inverter and a load. A first power supply switching thyristor connected to the standby power supply, a second power supply switching thyristor connected between the standby power supply and the load, and an alternately connected thyristor connected to the first and second power supply switching thyristors. A switching logic circuit for turning ON / OFF the input side, an input side is connected between the control power supply and the failure signal transmitting transistor, and an output side is A photocoupler connected to the switching logic circuit, and a normal power supply operation signal indicating that the normal power supply is operating is applied to a non-inverting input terminal of the AND gate when the normal power supply is normally operated. And the failure detection signal is not applied to the inverting input terminal of the AND gate, the AND gate turns on the failure signal transmission transistor, a signal is sent from the photocoupler to the switching logic circuit, and the switching logic circuit Controls the first power supply switching thyristor to ON and the second power supply switching thyristor to OFF to switch to the regular power supply. When the regular power supply fails, the failure detection signal is applied to the inverted input of the AND gate. When the service power is stopped, the service power operation signal is applied to the non-inverting input terminal of the AND gate. Not, in any case the AN
The D gate turns off the fault signal transmission transistor, no signal is sent from the photocoupler to the switching logic circuit, the switching logic circuit turns off the first power supply switching thyristor, and switches the second power supply switching circuit. The thyristor is turned on to switch to the standby power supply.
［作 用］ この発明においては、常用電源内の制御電源喪失時や
誤操作による常用電源停止時にも確実に予備電源へ切り
換えることができ、また信号伝送の配線の短絡や断線時
も確実に切り換えることができる。[Operation] In the present invention, it is possible to reliably switch to the standby power supply even when the control power supply in the normal power supply is lost or when the normal power supply is stopped due to an erroneous operation, and also to surely switch the signal transmission wiring even when the wiring is short-circuited or disconnected. Can be.
［実施例］ 以下、この発明の一実施例を図について説明する。An embodiment of the present invention will be described below with reference to the drawings.
第１図はこの発明に係る電源切り換え方法を説明する
回路図を示し、第３図の回路とは、常用電源（１）中の
故障検出回路（12）とトランジスタ（14）の間にANDゲ
ート（15）を接続した点が違う。FIG. 1 is a circuit diagram for explaining a power supply switching method according to the present invention. The circuit shown in FIG. 3 is different from the circuit in FIG. (15) is different.
次に、第２図のタイムチャート図を参照しながら、第
１図の回路動作を説明する。Next, the circuit operation of FIG. 1 will be described with reference to the time chart of FIG.
常用電源（１）の正常運転時には、常用電源（１）が
運転中であることを示す信号がANDゲート（15）の非反
転入力端子に印加されかつ故障検出信号がANDゲート（1
5）の反転入力端子に印加されないので、ANDゲート（1
5）はトランジスタ（14）をターンオンさせ、これによ
りフォトカプラ（34）から切り換えロジック回路（33）
へ信号が送られ、切り換えロジック回路（33）はサイリ
スタ（31）をON、サイリスタ（32）をOFFに制御する。
従って、負荷へは常用電源（１）から給電される。During normal operation of the service power supply (1), a signal indicating that the service power supply (1) is operating is applied to the non-inverting input terminal of the AND gate (15), and a failure detection signal is output to the AND gate (1).
Since it is not applied to the inverting input terminal of 5), the AND gate (1
5) turns on the transistor (14), thereby switching from the photocoupler (34) to the logic circuit (33)
The switching logic circuit (33) controls the thyristor (31) to be ON and the thyristor (32) to be OFF.
Therefore, power is supplied to the load from the commercial power supply (1).
しかしながら、常用電源（１）が故障したり、制御電
源（13）が喪失したり、信号伝送線が短絡、断線したり
すると、トランジスタ（14）がOFFになつて信号がフォ
トカプラ（34）から切り換えロジック回路（33）へ送ら
れなくなるので、切り換えロジツク回路（33）はサイリ
スタ（31）をOFF、サイリスタ（32）をONに制御し、従
来例と同様に予備電源給電となる。However, if the service power supply (1) fails, the control power supply (13) is lost, or the signal transmission line is short-circuited or disconnected, the transistor (14) is turned off and the signal is transmitted from the photocoupler (34). Since the signal is no longer sent to the switching logic circuit (33), the switching logic circuit (33) controls the thyristor (31) to be OFF and the thyristor (32) to be ON, so that the backup power is supplied as in the conventional example.
なお、第１図には交流電源の切り換え回路を示した
が、直流電源やその他の電源回路の切り換えにこの発明
を適用することができる。Although FIG. 1 shows a circuit for switching an AC power supply, the present invention can be applied to switching between a DC power supply and other power supply circuits.
また、常用電源は並列運転を行う複数台のインバータ
で構成されていてもよく、この場合各インバータからの
伝送信号を切り換え回路で受信し、切り換えロジック回
路により適宜運転台数を判断して予備電源へ切り換えれ
ばよい。In addition, the service power supply may be composed of a plurality of inverters that operate in parallel. In this case, the transmission signal from each inverter is received by the switching circuit, and the switching logic circuit determines the number of operating units as appropriate and switches to the standby power supply. You just need to switch.
［発明の効果］ 以上のように、この発明は、常用電源と予備電源を切
り換える切り換え回路を用いた電源切り換え方法におい
て、前記常用電源は、インバータと、常用電源の故障を
検出する故障検出回路と、制御電源と、故障信号伝送用
トランジスタと、前記故障検出回路と前記故障信号伝送
用トランジスタの間に接続されたANDゲートとを備え、
前記切り換え回路は、前記インバータと負荷の間に接続
された第１の電源切り換え用サイリスタと、前記予備電
源と前記負荷の間に接続された第２の電源切り換え用サ
イリスタと、前記第１及び第２の電源切り換え用サイリ
スタに接続されて交互にON/OFFさせる切り換えロジック
回路と、入力側が前記制御電源と前記故障信号伝送用ト
ランジスタの間に接続されかつ出力側が前記切り換えロ
ジック回路に接続されたフォトカプラとを備え、前記常
用電源の正常連転時には、前記常用電源が運転中である
ことを示す常用電源運転信号が前記ANDゲートの非反転
入力端子に印加され、かつ故障検出信号が前記ANDゲー
トの反転入力端子に印加されず、前記ANDゲートは前記
故障信号伝送用トランジスタをターンオンさせ、前記フ
ォトカプラから前記切り換えロジック回路へ信号が送ら
れ、前記切り換えロジック回路は前記第１の電源切り換
え用サイリスタをON、前記第２の電源切り換え用サイリ
スタをOFFに制御して前記常用電源へ切り換え、前記常
用電源の故障時には、前記故障検出信号が前記ANDゲー
トの反転入力端子に印加され、前記常用電源の停止時に
は、前記常用電源運転信号が前記ANDゲートの非反転入
力端子に印加されず、いずれの場合も前記ANDゲートは
前記故障信号伝送用トランジスタをターンオフさせ、前
記フォトカプラから前記切り換えロジック回路へ信号が
送られず、前記切り換えロジック回路は前記第１の電源
切り換え用サイリスタをOFF、前記第２の電源切り換え
用サイリスタをONに制御して前記予備電源へ切り換える
ようにしたので、常用電源が故障した時に確実に予備電
源へ切り換えることができ、また制御電源喪失時にも予
備電源への切り換え指令を確実に伝送することができる
という効果を奏する。[Effects of the Invention] As described above, the present invention relates to a power supply switching method using a switching circuit for switching between a regular power supply and a standby power supply, wherein the regular power supply includes an inverter and a failure detection circuit for detecting a failure of the regular power supply. A control power supply, a failure signal transmission transistor, and an AND gate connected between the failure detection circuit and the failure signal transmission transistor,
A switching power supply thyristor connected between the inverter and the load; a second power supply switching thyristor connected between the standby power supply and the load; A switching logic circuit connected to the power supply switching thyristor and alternately turning on and off; and a photocoupler having an input connected between the control power supply and the failure signal transmission transistor and an output connected to the switching logic circuit. A normal power supply operation signal indicating that the normal power supply is operating is applied to a non-inverting input terminal of the AND gate, and a failure detection signal is output from the AND gate. And the AND gate turns on the fault signal transmission transistor, and the switching from the photocoupler is performed. A signal is sent to a logic circuit, and the switching logic circuit controls the first power supply switching thyristor to ON and the second power supply switching thyristor to OFF to switch to the regular power supply. The failure detection signal is applied to an inverting input terminal of the AND gate, and when the service power is stopped, the service power operation signal is not applied to the non-inverting input terminal of the AND gate. Turns off the failure signal transmission transistor, no signal is sent from the photocoupler to the switching logic circuit, the switching logic circuit turns off the first power supply switching thyristor, and the second power supply switching thyristor Is turned on to switch to the standby power supply, so if the normal power supply fails, the standby power supply It can be switched, and an effect that even when the control power loss can be transmitted the switching instruction to the backup power supply reliably.
第１図はこの発明の一実施例を説明する回路図、第２図
は第１図の回路動作説明用タイムチャート図、第３図は
従来の電源切り換え方法を説明する回路図、第４図は第
３図の回路動作説明用タイムチャート図である。 図において（１）は常用電源、（２）は予備電源、
（３）は切り換え回路、（13）は制御電源、（14）はト
ランジスタ、（15）はANDゲート、（34）はフォトカプ
ラである。 なお、図中、同一符号は同一、又は相当部分を示す。FIG. 1 is a circuit diagram for explaining an embodiment of the present invention, FIG. 2 is a time chart for explaining the circuit operation of FIG. 1, FIG. 3 is a circuit diagram for explaining a conventional power supply switching method, and FIG. FIG. 4 is a time chart for explaining the circuit operation of FIG. 3; In the figure, (1) is a regular power supply, (2) is a standby power supply,
(3) is a switching circuit, (13) is a control power supply, (14) is a transistor, (15) is an AND gate, and (34) is a photocoupler. In the drawings, the same reference numerals indicate the same or corresponding parts.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) H02J 9/00 - 11/00 ──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. 7 , DB name) H02J 9/00-11/00
Claims (1)
回路を用いた電源切り換え方法において、 前記常用電源は、インバータと、常用電源の故障を検出
する故障検出回路と、制御電源と、故障信号伝送用トラ
ンジスタと、前記故障検出回路と前記故障信号伝送用ト
ランジスタの間に接続されたANDゲートとを備え、 前記切り換え回路は、前記インバータと負荷の間に接続
された第１の電源切り換え用サイリスタと、前記予備電
源と前記負荷の間に接続された第２の電源切り換え用サ
イリスタと、前記第１及び第２の電源切り換え用サイリ
スタに接続されて交互にON/OFFさせる切り換えロジック
回路と、入力側が前記制御電源と前記故障信号伝送用ト
ランジスタの間に接続されかつ出力側が前記切り換えロ
ジック回路に接続されたフォトカプラとを備え、 前記常用電源の正常連転時には、前記常用電源が運転中
であることを示す常用電源運転信号が前記ANDゲートの
非反転入力端子に印加され、かつ故障検出信号が前記AN
Dゲートの反転入力端子に印加されず、前記ANDゲートは
前記故障信号伝送用トランジスタをターンオンさせ、前
記フォトカプラから前記切り換えロジック回路へ信号が
送られ、前記切り換えロジック回路は前記第１の電源切
り換え用サイリスタをON、前記第２の電源切り換え用サ
イリスタをOFFに制御して前記常用電源へ切り換え、 前記常用電源の故障時には、前記故障検出信号が前記AN
Dゲートの反転入力端子に印加され、前記常用電源の停
止時には、前記常用電源運転信号が前記ANDゲートの非
反転入力端子に印加されず、いずれの場合も前記ANDゲ
ートは前記故障信号伝送用トランジスタをターンオフさ
せ、前記フォトカプラから前記切り換えロジック回路へ
信号が送られず、前記切り換えロジック回路は前記第１
の電源切り換え用サイリスタをOFF、前記第２の電源切
り換え用サイリスタをONに制御して前記予備電源へ切り
換える ことを特徴とする電源切り換え方法。1. A power supply switching method using a switching circuit for switching between a regular power supply and a standby power supply, wherein the regular power supply includes an inverter, a failure detection circuit for detecting a failure of the regular power supply, a control power supply, and a failure signal transmission circuit. A transistor, and an AND gate connected between the failure detection circuit and the failure signal transmission transistor; the switching circuit includes a first power supply switching thyristor connected between the inverter and a load; A second power supply switching thyristor connected between the standby power supply and the load, a switching logic circuit connected to the first and second power supply switching thyristors to turn on / off alternately, A photocoupler connected between a control power supply and the fault signal transmission transistor and having an output side connected to the switching logic circuit; Wherein the at the time of normal regular rotation of commercial power, the commercial power operation signal indicating that commercial power is in operation is applied to the non-inverting input terminal of said AND gate, and said failure detection signal AN
Not applied to the inverting input terminal of the D gate, the AND gate turns on the fault signal transmission transistor, a signal is sent from the photocoupler to the switching logic circuit, and the switching logic circuit switches the first power supply. Thyristor is turned on and the second power supply switching thyristor is turned off to switch to the regular power supply. When the regular power supply fails, the failure detection signal
Applied to the inverting input terminal of the D gate, and when the service power supply is stopped, the service power operation signal is not applied to the non-inverting input terminal of the AND gate. Is turned off, no signal is sent from the photocoupler to the switching logic circuit, and the switching logic circuit
A power supply switching method, characterized in that the power supply switching thyristor is turned off and the second power supply switching thyristor is turned on to switch to the standby power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2190485A JP3045748B2 (en) | 1990-07-20 | 1990-07-20 | Power supply switching method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2190485A JP3045748B2 (en) | 1990-07-20 | 1990-07-20 | Power supply switching method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0479735A JPH0479735A (en) | 1992-03-13 |
| JP3045748B2 true JP3045748B2 (en) | 2000-05-29 |
Family
ID=16258883
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2190485A Expired - Lifetime JP3045748B2 (en) | 1990-07-20 | 1990-07-20 | Power supply switching method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3045748B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101648878B1 (en) * | 2014-06-27 | 2016-08-17 | 대우조선해양 주식회사 | Power supply for electric welder |
-
1990
- 1990-07-20 JP JP2190485A patent/JP3045748B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101648878B1 (en) * | 2014-06-27 | 2016-08-17 | 대우조선해양 주식회사 | Power supply for electric welder |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0479735A (en) | 1992-03-13 |
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