JPH07123333B2 - Cutout for current transformer - Google Patents
Cutout for current transformerInfo
- Publication number
- JPH07123333B2 JPH07123333B2 JP4358491A JP35849192A JPH07123333B2 JP H07123333 B2 JPH07123333 B2 JP H07123333B2 JP 4358491 A JP4358491 A JP 4358491A JP 35849192 A JP35849192 A JP 35849192A JP H07123333 B2 JPH07123333 B2 JP H07123333B2
- Authority
- JP
- Japan
- Prior art keywords
- load
- secondary winding
- current
- transformer
- 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 - Lifetime
Links
Landscapes
- Protection Of Static Devices (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、電流トランスを使用
した高周波定電流給電方式に於て、電流トランスの２次
側が開放状態になることを防止するための電流トランス
用安全器に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a current transformer safety device for preventing a secondary side of a current transformer from being opened in a high frequency constant current power supply system using a current transformer. .
【０００２】[0002]
【従来の技術】本出願人は、高周波定電流電源から電流
トランスを使用して放電管に電力を供給するようにした
高周波定電流給電方式を開発し、既に実用新案登録を受
けている（実公昭６４−５３６０号公報「無結線放電管
照明器具」参照）。その概要について図３を参照しなが
ら説明すると、高周波定電流電源１１に接続した一本の
給電線１２に電流トランス１３を遊貫させその２次巻線
１４に放電管１５の両端子を直接接続したものであり、
放電管１５が放電を開始する前には２次巻線１４に電流
が流れないため電流トランス１３の鉄心が飽和すること
により２次巻線１４に放電管１５の放電開始電圧より高
い電圧が現われ、この電圧により放電管１５が放電を開
始した後は２次巻線１４にその巻数に応じた一定電流が
流れるようになっている。2. Description of the Related Art The applicant has developed a high-frequency constant-current power supply system in which a high-frequency constant-current power supply is used to supply power to a discharge tube using a current transformer, and has already been registered as a utility model. Refer to Japanese Unexamined Patent Publication No. Sho 64-5360, "Wireless Discharge Tube Lighting Equipment". An outline thereof will be described with reference to FIG. 3. A single power supply line 12 connected to a high-frequency constant current power supply 11 is allowed to pass a current transformer 13, and its secondary winding 14 is directly connected to both terminals of a discharge tube 15. It was done,
Before the discharge tube 15 starts discharging, no current flows in the secondary winding 14, so that the iron core of the current transformer 13 is saturated and a voltage higher than the discharge starting voltage of the discharge tube 15 appears in the secondary winding 14. After the discharge tube 15 starts discharging due to this voltage, a constant current corresponding to the number of turns of the secondary winding 14 flows.
【０００３】ところが、放電管１５が切れたり放電管１
５を外したりした場合には、電流トランス１３の２次巻
線１４に放電管１５の放電電圧より高い電圧が現れるか
ら、放電管を取り替える際に誤って２次巻線１４の端子
に触れると感電するおそれがあり、また、磁束が増えて
鉄損が著しく増加するためトランスが過熱しそのまま放
置すると危険であるという欠点があった。However, the discharge tube 15 may be broken or the discharge tube 1
When 5 is removed, a voltage higher than the discharge voltage of the discharge tube 15 appears in the secondary winding 14 of the current transformer 13, so if the terminal of the secondary winding 14 is accidentally touched when replacing the discharge tube. There is a drawback that there is a risk of electric shock and that the magnetic flux increases and the iron loss remarkably increases, which is dangerous if the transformer is overheated and left as it is.
【０００４】[0004]
【発明が解決しようとする課題】この発明の目的は、電
流トランスの負荷が開放状態になったとき、これを検出
して電流トランスの２次巻線を自動的に短絡し、感電や
過熱の危険を防止するための電流トランス用安全器を提
供することである。SUMMARY OF THE INVENTION It is an object of the present invention to detect when the load of a current transformer is in an open state and automatically short-circuit the secondary winding of the current transformer to prevent electric shock or overheating. It is to provide a safety device for a current transformer to prevent danger.
【０００５】[0005]
【課題を解決するための手段】上記の目的を解決するた
め、この発明の電流トランス用安全器は、一次巻線に高
周波定電流を流した電流トランスの二次巻線の両端子間
に電圧確保用コンデンサーとスイッチング手段とを直列
に接続してなる短絡用回路を接続し、前記二次巻線の一
端を一方の負荷端子に直結するとともに前記二次巻線の
他端と他方の負荷端子との間に負荷電流検出用トランス
の一次巻線を接続し、負荷電流検出用トランスの二次巻
線に整流回路を介して前記スイッチング手段を開閉する
手段を接続している。In order to solve the above-mentioned problems, a safety device for a current transformer according to the present invention provides a voltage between both terminals of a secondary winding of a current transformer in which a high frequency constant current is applied to the primary winding. A short-circuit is formed by connecting a securing capacitor and switching means in series, one end of the secondary winding is directly connected to one load terminal, and the other end of the secondary winding and the other load terminal are connected. , And a primary winding of the load current detecting transformer is connected to the secondary winding of the load current detecting transformer, and means for opening and closing the switching means is connected to the secondary winding of the load current detecting transformer via a rectifier circuit.
【０００６】[0006]
【作用】この電流トランス用安全器を電流トランスと負
荷との間に接続しておくと、負荷に電流が流れていると
きは負荷電流検出用トランスの二次巻線に現われる出力
により短絡用回路のスイッチング手段が開状態に保たれ
ているが、何らかの原因で電流トランスの負荷が開放状
態になると、負荷電流検出用トランスの二次巻線に出力
がなくなるため短絡用回路のスイッチング手段が閉じて
電流トランスの二次巻線の両端子間が短絡される。そし
て、開放状態となった負荷を正常なものに交換すると電
圧確保用コンデンサーの端子電圧により負荷が再起動し
て短絡用回路が自動的に開放される。When the current transformer cutout is connected between the current transformer and the load, the short-circuiting circuit is generated by the output appearing in the secondary winding of the load current detecting transformer when current is flowing through the load. However, if the load of the current transformer becomes open for some reason, the output of the secondary winding of the load current detection transformer will disappear and the switching means of the short circuit will close. The terminals of the secondary winding of the current transformer are short-circuited. When the open load is replaced with a normal load, the load is restarted by the terminal voltage of the voltage securing capacitor and the short circuit is automatically opened.
【０００７】[0007]
【実施例】この発明の第１実施例について図１を参照し
ながら説明する。電流トランス１に例えば４０ｋＨｚ、
２０Ａの高周波定電流の流れる給電線２が一次巻線とし
て貫通（即ち、１ターン巻回）し、二次巻線３が例えば
５０ターン巻回され、その両端子間に、電圧確保用コン
デンサーＣとリレー４の常閉接点Ｓとからなる短絡用回
路が接続されている。電圧確保用コンデンサーＣの値
は、負荷として蛍光灯を使用する場合、常閉接点Ｓが閉
じた状態で電圧確保用コンデンサーＣの両端の電圧が電
気工事の安全基準（３００Ｖ以下）を満たすとともに蛍
光灯の放電開始電圧より少し高い程度になるように設定
する。他の負荷、例えば白熱電球、モーター等を使用す
る場合にはさらに低くしてもよい。DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIG. 40 kHz for the current transformer 1,
The power supply line 2 through which a high-frequency constant current of 20 A flows is penetrated as a primary winding (that is, one turn is wound), and the secondary winding 3 is wound for 50 turns, for example, and a voltage securing capacitor C is provided between both terminals. And a normally closed contact S of the relay 4 are connected to the short circuit. When a fluorescent lamp is used as a load, the value of the voltage securing capacitor C is such that the voltage at both ends of the voltage securing capacitor C meets the safety standard (300 V or less) for electrical work when the normally closed contact S is closed. Set the voltage so that it is slightly higher than the discharge start voltage of the lamp. It may be lower if other loads such as incandescent bulbs, motors, etc. are used.
【０００８】二次巻線３の一端は負荷端子５に直結さ
れ、また、二次巻線３の他端と負荷端子６との間に負荷
電流検出用トランス７の一次巻線８が接続されている。
負荷電流検出用トランス７の二次巻線９に整流回路を介
してリレー４のソレノイドが接続され、一次巻線８に負
荷電流が流れたとき二次巻線９に流れる電流によりリレ
ー４のソレノイドを励磁して常閉接点Ｓを開くようにな
っている。一次巻線８および二次巻線９の巻数は、例え
ば２０ターンおよび８０ターンである。One end of the secondary winding 3 is directly connected to the load terminal 5, and the primary winding 8 of the load current detecting transformer 7 is connected between the other end of the secondary winding 3 and the load terminal 6. ing.
The solenoid of the relay 4 is connected to the secondary winding 9 of the load current detecting transformer 7 via a rectifier circuit, and when the load current flows through the primary winding 8, the solenoid of the relay 4 is driven by the current flowing through the secondary winding 9. Is excited to open the normally closed contact S. The number of turns of the primary winding 8 and the secondary winding 9 is, for example, 20 turns and 80 turns.
【０００９】負荷端子５および６の間に負荷として蛍光
灯１０を接続すると、電流トランス１の二次巻線３に現
れる電圧により蛍光灯が放電を開始し、点灯後は端子電
圧が蛍光灯の放電電圧まで下がるとともに２０Ａ÷５０
＝０．４Ａの放電電流で放電を持続する。そして、この
負荷電流により負荷電流検出用トランス７の二次巻線９
に０．１Ａの電流が流れ、リレー４のソレノイドが励磁
されて常閉接点Ｓが開きその状態に保たれる。いま、蛍
光灯が切れたり交換のため外したりして負荷電流がゼロ
になると、リレー４のソレノイドの励磁が解消されて常
閉接点Ｓが閉じ、電流トランス１の二次巻線３の端子が
電圧確保用コンデンサーＣを介して短絡され、負荷端子
５および６の間に現れる電圧は安全な低い設定値に保た
れる。蛍光灯１０を交換すると、電圧確保用コンデンサ
ーＣの端子電圧により自動的に点灯して負荷電流が流
れ、再びリレー４のソレノイドが励磁されて常閉接点Ｓ
が開き短絡用回路が開状態に保たれる。When the fluorescent lamp 10 is connected as a load between the load terminals 5 and 6, the fluorescent lamp starts discharging due to the voltage appearing in the secondary winding 3 of the current transformer 1, and after the lighting, the terminal voltage is equal to that of the fluorescent lamp. 20A ÷ 50 as the voltage drops to the discharge voltage
Discharge is continued with a discharge current of 0.4 A. Then, this load current causes the secondary winding 9 of the load current detecting transformer 7.
A current of 0.1 A flows through the solenoid, the solenoid of the relay 4 is excited, and the normally closed contact S is opened and maintained in that state. Now, when the load current becomes zero by disconnecting the fluorescent lamp or removing it for replacement, the excitation of the solenoid of the relay 4 is canceled, the normally closed contact S is closed, and the terminal of the secondary winding 3 of the current transformer 1 is closed. The voltage appearing between the load terminals 5 and 6 which is short-circuited via the voltage securing capacitor C is kept at a safe low set value. When the fluorescent lamp 10 is replaced, it automatically lights up due to the terminal voltage of the voltage securing capacitor C, a load current flows, the solenoid of the relay 4 is excited again, and the normally closed contact S
Opens and the short circuit is kept open.
【００１０】図２は、この発明の第２実施例を示したも
のである。電流トランス１の二次巻線３の両端子間に接
続される短絡用回路が、電圧確保用コンデンサーＣおよ
びこれに全波整流回路を介して直列に接続されたスイッ
チング素子ＦＥＴにより構成されている。二次巻線３の
一端が負荷端子５に直結され、これとＦＥＴのゲートと
の間にダイオードおよび抵抗が直列に接続され、また、
ＦＥＴのゲート・ソース間にコンデンサーおよびトラン
ジスタＴが並列に接続されている。電流トランス１の二
次巻線３の他端と負荷端子６との間に負荷電流検出用ト
ランス７の一次巻線８が接続され、その二次巻線９が整
流回路を介してトランジスタＴのベース・エミッタ間に
接続されている。FIG. 2 shows a second embodiment of the present invention. The short circuit connected between both terminals of the secondary winding 3 of the current transformer 1 is composed of a voltage securing capacitor C and a switching element FET serially connected to the voltage securing capacitor C. . One end of the secondary winding 3 is directly connected to the load terminal 5, a diode and a resistor are connected in series between this and the gate of the FET, and
A capacitor and a transistor T are connected in parallel between the gate and source of the FET. The primary winding 8 of the load current detection transformer 7 is connected between the other end of the secondary winding 3 of the current transformer 1 and the load terminal 6, and the secondary winding 9 of the transistor T is connected via a rectifier circuit. It is connected between the base and emitter.
【００１１】その動作について説明すると、負荷電流検
出用トランス７の一次巻線８に負荷電流が流れると、そ
の二次巻線９に誘起される電流によりトランジスタＴが
オンし並列に接続したコンデンサーが放電してＦＥＴの
ソース・ゲート間電圧がゼロになり、ＦＥＴがオフとな
る。何らかの原因により負荷電流が流れなくなると、ト
ランジスタＴがオフとなり並列に接続したコンデンサー
が充電されてＦＥＴのゲート電位が上昇しオンとなって
短絡用回路が閉成され、電流トランス１の二次巻線３の
端子が電圧確保用コンデンサーＣを介して短絡される。
蛍光灯１０を交換し、これが自動的に点灯して再び負荷
電流が流れると、ＦＥＴがオフとなり短絡用回路が開
く。To explain its operation, when a load current flows through the primary winding 8 of the load current detecting transformer 7, the transistor T is turned on by the current induced in the secondary winding 9, and the capacitor connected in parallel is removed. The source-gate voltage of the FET is discharged to zero and the FET is turned off. When the load current stops flowing for some reason, the transistor T is turned off, the capacitor connected in parallel is charged, the gate potential of the FET rises, and the FET is turned on to close the short circuit, and the secondary winding of the current transformer 1 is closed. The terminal of the wire 3 is short-circuited via the voltage securing capacitor C.
When the fluorescent lamp 10 is replaced, and the fluorescent lamp 10 is automatically turned on and a load current flows again, the FET is turned off and the short circuit is opened.
【００１２】なお、上記実施例に於ては、負荷として蛍
光灯を接続しているが、これに限られるものではなく、
白熱電灯、モーター、ヒーターその他各種のものを使用
することができる。給電線に流す高周波定電流の周波数
および電流値、電流トランスの形状、大きさおよび一次
および二次巻線の巻数、電圧確保用コンデンサーの値、
スイッチング手段の種類および定格、負荷電流検出用ト
ランスの規格および一次および二次巻線の巻数等は、負
荷の種類および定格に応じて適宜設計変更することがで
きる。Although a fluorescent lamp is connected as a load in the above embodiment, the load is not limited to this.
Incandescent lamps, motors, heaters and various other types can be used. The frequency and current value of the high frequency constant current flowing in the power supply line, the shape and size of the current transformer, the number of turns of the primary and secondary windings, the value of the voltage securing capacitor,
The type and rating of the switching means, the standard of the load current detecting transformer, the number of turns of the primary and secondary windings, and the like can be appropriately designed and changed according to the type and rating of the load.
【００１３】[0013]
【発明の効果】以上説明したとおり、この発明の電流ト
ランス用安全器は、電流トランスの負荷が開放状態とな
ったとき自動的に確実に短絡用回路を閉じて負荷端子を
短絡することができ、高電圧や過熱による事故を防止す
ることができ安全であり、負荷を交換すると自動的に点
灯または起動し同時に短絡用回路も自動的に開き、動作
が確実で故障するおそれもないという優れた効果を奏す
るものである。As described above, the current transformer safety device of the present invention can automatically and surely close the short-circuiting circuit to short-circuit the load terminals when the load of the current transformer is opened. It is safe because it can prevent accidents due to high voltage and overheat, and when the load is replaced, it automatically lights up or starts up, and at the same time, the short circuit opens automatically. It is effective.
【図１】この発明の第１実施例の回路図FIG. 1 is a circuit diagram of a first embodiment of the present invention.
【図２】この発明の第２実施例の回路図FIG. 2 is a circuit diagram of a second embodiment of the present invention.
【図３】従来技術を説明する概略図FIG. 3 is a schematic diagram illustrating a conventional technique.
１ 電流トランス ２ 給電線 ３ 二次巻
線 ４ リレー５、６ 負荷端子 ７ 負荷
電流検出用トランス １０ 蛍光灯1 Current Transformer 2 Feed Line 3 Secondary Winding 4 Relay 5, 6 Load Terminal 7 Load Current Detection Transformer 10 Fluorescent Lamp
Claims (1)
ランスの二次巻線の両端子間に電圧確保用コンデンサー
とスイッチング手段とを直列に接続してなる短絡用回路
を接続し、前記二次巻線の一端を一方の負荷端子に直結
するとともに前記二次巻線の他端と他方の負荷端子との
間に負荷電流検出用トランスの一次巻線を接続し、負荷
電流検出用トランスの二次巻線に整流回路を介して前記
スイッチング手段を開閉する手段を接続したことを特徴
とする電流トランス用安全器。1. A short circuit for connecting a voltage securing capacitor and a switching means in series is connected between both terminals of a secondary winding of a current transformer in which a high frequency constant current is applied to the primary winding. One end of the secondary winding is directly connected to one load terminal, and the primary winding of the load current detection transformer is connected between the other end of the secondary winding and the other load terminal, and the load current detection transformer is connected. A safety device for a current transformer, characterized in that a means for opening and closing the switching means is connected to the secondary winding of the above through a rectifier circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4358491A JPH07123333B2 (en) | 1992-12-26 | 1992-12-26 | Cutout for current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4358491A JPH07123333B2 (en) | 1992-12-26 | 1992-12-26 | Cutout for current transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06205532A JPH06205532A (en) | 1994-07-22 |
| JPH07123333B2 true JPH07123333B2 (en) | 1995-12-25 |
Family
ID=18459594
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4358491A Expired - Lifetime JPH07123333B2 (en) | 1992-12-26 | 1992-12-26 | Cutout for current transformer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07123333B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3956610B2 (en) * | 2000-11-06 | 2007-08-08 | 株式会社ダイフク | Contactless power supply equipment and branch box used for this contactless power supply equipment |
| GB2520037B (en) * | 2013-11-07 | 2021-08-11 | Greengage Lighting Ltd | Power distribution |
| JP2020155538A (en) * | 2019-03-19 | 2020-09-24 | Tdk株式会社 | Coil device, wireless power transmission device, wireless power reception device, wireless power transmission system, and electrical apparatus |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50144058A (en) * | 1974-05-10 | 1975-11-19 | ||
| JPS6082935U (en) * | 1983-11-14 | 1985-06-08 | 東芝エンジニアリング株式会社 | Abnormal voltage prevention device for current transformer |
| JP2814484B2 (en) * | 1988-01-12 | 1998-10-22 | 日本電気株式会社 | Frame synchronization method |
-
1992
- 1992-12-26 JP JP4358491A patent/JPH07123333B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06205532A (en) | 1994-07-22 |
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