JPH06269124A - High-frequency constant-current power supply system - Google Patents
High-frequency constant-current power supply systemInfo
- Publication number
- JPH06269124A JPH06269124A JP5076479A JP7647993A JPH06269124A JP H06269124 A JPH06269124 A JP H06269124A JP 5076479 A JP5076479 A JP 5076479A JP 7647993 A JP7647993 A JP 7647993A JP H06269124 A JPH06269124 A JP H06269124A
- Authority
- JP
- Japan
- Prior art keywords
- current
- load
- current transformer
- power supply
- secondary winding
- 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
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、高周波定電流電源か
ら電流トランスを使用して負荷に電力を供給する高周波
定電流給電方式に於て、負荷に供給する電流値を正確な
値に設定するとともに負荷が開放された場合の危険を防
止する方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention sets a current value supplied to a load to an accurate value in a high frequency constant current power supply system in which power is supplied from a high frequency constant current power supply to a load by using a current transformer. It also relates to a method for preventing the danger when the load is released.
【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
無結線放電管照明器具を開発し、既に実用新案登録を受
けている（登録第１７８６９０１号、実公昭６４−５３
６０号公報参照）。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を遊貫させその二次巻線
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を給電線１２に沿って任意の位置に移動させ
ることができ、導電部分が全く露出しないから如何なる
雰囲気中でも安全に使用することができるという利点が
ある。2. Description of the Related Art The present applicant has developed a connectionless discharge tube luminaire in which a current transformer is used to supply power to a discharge tube from a high frequency constant current power source, and has already been registered as a utility model ( Registered No. 1786901, J. Sho 64-53
No. 60). 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 freely pass a current transformer 13, and its secondary winding 14 is directly connected to both terminals of a discharge tube 15. It was done,
Since the discharge tube 15 can be moved to any position along the power supply line 12 and the conductive portion is not exposed at all, there is an advantage that it can be used safely in any atmosphere.
【０００３】このような電流トランスを使用した高周波
定電流給電方式は、放電管に限らず、白熱電灯、モータ
ー、電熱器等あらゆる電気機器の給電に使用することが
可能であり、定電圧給電方式と違って負荷に過大電流が
流れることがないから機器の寿命を著しく長くすること
ができる。ところが、例えば定格が１２Ｖ、５０Ｗのハ
ロゲンランプのような大電流の負荷に給電する場合、定
格電流である４.２Ａを得るには電流トランスに遊貫し
た給電線に流れる電流が１０Ａであったとすると二次巻
線を２.４ターンにしなければらず、これを正確に作る
ことが難しいという欠点があった。The high frequency constant current power supply system using such a current transformer can be used not only for the discharge tube but also for power supply of any electric equipment such as an incandescent lamp, a motor, an electric heater, and the constant voltage power supply system. Unlike the above, an excessive current does not flow to the load, so the life of the device can be remarkably extended. However, for example, when supplying a large-current load such as a halogen lamp rated at 12V and 50W, the current flowing through the power supply line through the current transformer was 10A to obtain the rated current of 4.2A. Then, the secondary winding had to be 2.4 turns, which was a drawback that it was difficult to make this accurately.
【０００４】また、放電管１５が切れたり交換のため外
したりして電流トランスの二次巻線が開放されると、ト
ランスの鉄芯が飽和して二次巻線の端子間に高い電圧が
現れるから誤って触れると感電するおそれがあり、さら
に、磁束が増えて鉄損が著しく増加するため電流トラン
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。When the secondary winding of the current transformer is opened by disconnecting the discharge tube 15 or removing it for replacement, the iron core of the transformer is saturated and a high voltage is applied across the terminals of the secondary winding. Since it appears, there is a risk of electric shock if touched accidentally, and further, there is a drawback that the current transformer is overheated and it is dangerous to leave it as it is because the magnetic flux increases and iron loss increases remarkably.
【０００５】[0005]
【発明が解決しようとする課題】この発明の目的は、上
記従来装置の欠点を改良することであり、電流トランス
を使用した高周波定電流給電方式に於て、負荷に供給す
る電流値を容易にかつ正確に設定することができ、かつ
負荷が断線等により開放された場合でも無負荷とならず
危険を防止することができる方法を提供することであ
る。SUMMARY OF THE INVENTION An object of the present invention is to improve the above-mentioned drawbacks of the conventional device. In a high frequency constant current power supply system using a current transformer, the current value supplied to the load can be easily adjusted. It is an object of the present invention to provide a method which can be set accurately and can prevent a danger without becoming a no load even when a load is opened due to a disconnection or the like.
【０００６】[0006]
【課題を解決するための手段】上記の目的を解決するた
め、この発明の高周波定電流給電方式は、高周波定電流
電源に接続した給電線を電流トランスの一次巻線として
巻回し、該電流トランスの二次巻線の両端子間にコンデ
ンサーと負荷とを並列に接続するようにしている。In order to solve the above-mentioned problems, a high frequency constant current power supply system of the present invention has a power supply line connected to a high frequency constant current power supply wound as a primary winding of a current transformer. A capacitor and a load are connected in parallel between both terminals of the secondary winding of.
【０００７】[0007]
【作用】給電線に流れる電流をＩ、電流トランスの一次
および二次巻線の巻数をそれぞれＮ1およびＮ2とする
と、電流トランスの二次巻線に流れる電流はＩ×Ｎ1／
Ｎ2であるが、Ｎ1は通常１〜３ターンしかとれないため
に電流トランスの二次巻線から得られる電流値が負荷の
定格電流の値と正確に一致しない場合が多い。そのよう
な場合に、二次巻線から得られる電流値を負荷の定格電
流より少し大きい値に設定しておき、負荷に並列に接続
したコンデンサーに分流することにより負荷に流れる電
流値を所望の値とすることができる。また、負荷が断線
等により開放された場合にはこのコンデンサーが二次巻
線の負荷となることにより高電圧の発生および電流トラ
ンスの過熱を防止する。When the current flowing through the power supply line is I and the numbers of turns of the primary and secondary windings of the current transformer are N 1 and N 2 , respectively, the current flowing through the secondary winding of the current transformer is I × N 1 /
Although it is N 2 , since N 1 normally takes only 1 to 3 turns, the current value obtained from the secondary winding of the current transformer often does not exactly match the rated current value of the load. In such a case, set the current value obtained from the secondary winding to a value that is slightly larger than the rated current of the load, and divide the current value into the capacitor connected in parallel to the load to obtain the desired current value for the load. It can be a value. Further, when the load is opened due to disconnection or the like, this capacitor serves as a load for the secondary winding, thereby preventing generation of high voltage and overheating of the current transformer.
【０００８】[0008]
【実施例】この発明の実施例について図１を参照しなが
ら説明する。６５kＨz、１０Ａの高周波定電流が流れる
給電線１が、環状の電流トランス２に一次巻線として貫
通し（即ち、１ターン巻回され）ている。電流トランス
２には二次巻線３が２ターン巻回され、その両端子間に
Ｉ＝５Ａの電流が出力されるようになっている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIG. A power supply line 1 through which a high frequency constant current of 65 kHz and 10 A flows is passed through an annular current transformer 2 as a primary winding (that is, wound one turn). The secondary winding 3 is wound around the current transformer 2 for two turns, and a current of I = 5 A is output between both terminals of the secondary winding 3.
【０００９】二次巻線３の両端子間に０.５５μＦのコ
ンデンサーＣおよびハロゲンランプ４が並列に接続され
ている。ハロゲンランプ４は市販の定格が１２Ｖ、５０
Ｗのものであり、その定格電流はＩd＝４.２Ａである。A 0.55 μF capacitor C and a halogen lamp 4 are connected in parallel between both terminals of the secondary winding 3. The halogen lamp 4 has a commercial rating of 12V, 50
W of which rated current is Id = 4.2A.
【００１０】コンデンサーＣに流れる電流Ｉcは、図２
に示すように、ハロゲンランプ４に流れる電流Ｉdより
も位相が９０度進んでいるからＩc2＋Ｉd2＝Ｉ2なる関
係が成立し、これからＩd＝√(Ｉ2−Ｉc2)である。Ｉc
＝２πｆＣＶであるから、これにｆ＝６５kＨz、Ｃ＝
０.５５μＦおよびＶ＝１２Ｖを代入すればＩc＝２.７
Ａとなり、従って、ハロゲンランプ４に流れる電流はＩ
d＝４.２Ａで、所望の定格電流であることが判る。The current Ic flowing through the capacitor C is shown in FIG.
As shown in, the phase is advanced by 90 degrees from the current Id flowing through the halogen lamp 4, so that the relationship of Ic 2 + Id 2 = I 2 is established, and from this, Id = √ (I 2 −Ic 2 ). Ic
= 2πfCV, f = 65 kHz, C =
Substituting 0.55 μF and V = 12V, Ic = 2.7
Therefore, the current flowing through the halogen lamp 4 is I
It can be seen that the desired rated current is obtained at d = 4.2A.
【００１１】いま、使用状態でハロゲンランプ４が断線
したとすると、電流トランス２の二次巻線３の端子間に
は、コンデンサーＣだけが接続されていることとなるか
ら、その両端にはＶc＝Ｉ／２πｆＣ＝２２Ｖが現れる
だけで、誤って触れても感電するおそれはなく、また、
磁束が増加してトランスが過熱するおそれもない。Now, assuming that the halogen lamp 4 is broken during use, only the capacitor C is connected between the terminals of the secondary winding 3 of the current transformer 2, and therefore Vc is provided at both ends thereof. = I / 2πfC = 22V appears, there is no danger of electric shock if touched by mistake, and
There is no fear that the magnetic flux will increase and the transformer will overheat.
【００１２】なお、コンデンサーＣの値を周知の手段に
より可変にしておけば定格の異なる負荷に対しても使用
することができる。給電線１に流す電流の周波数および
電流値は、他の電気機器への影響、負荷の種類、数等を
考慮して適宜設定すればよい。また、電流トランス２の
一次巻線として給電線を貫通させているが、２〜３ター
ン巻回することもできる。電流トランスとしては環状の
ものに限らず、例えば、コ字形コアやＥ字形コアをＩ字
形のコアと組合せたものなど適宜周知のものを使用する
ことができる。また、ハロゲンランプに限らず、蛍光
灯、白熱電球、モーター、電熱器等各種の負荷に給電す
ることもできる。If the value of the capacitor C is made variable by a known means, it can be used for loads having different ratings. The frequency and the current value of the current flowing through the power supply line 1 may be appropriately set in consideration of the influence on other electric devices, the type and number of loads, and the like. Further, although the power supply line is penetrated as the primary winding of the current transformer 2, it may be wound for 2 to 3 turns. The current transformer is not limited to the annular one, and any known one such as a U-shaped core or a combination of an E-shaped core and an I-shaped core can be used. In addition to the halogen lamp, it is possible to supply power to various loads such as a fluorescent lamp, an incandescent lamp, a motor, and an electric heater.
【００１３】[0013]
【発明の効果】以上説明したとおり、この発明の電流ト
ランスを使用した高周波定電流給電方式は、電流トラン
スの巻線比だけでは正確な値を得ることが難しい負荷電
流値を負荷に並列に適当な容量値のコンデンサーを接続
することにより容易にかつ正確に作ることができ、ま
た、負荷が断線したり交換のため外したりした場合にこ
のコンデンサーが電流トランスの二次巻線の負荷となっ
て高電圧の発生を防止しかつ磁束の増加を防止するから
感電や電流トランスの過熱を防止することができるとい
う優れた効果を奏するものである。As described above, according to the high frequency constant current feeding system using the current transformer of the present invention, it is difficult to obtain an accurate value only by the winding ratio of the current transformer. It can be easily and accurately made by connecting a capacitor with a different capacitance value, and this capacitor becomes the load for the secondary winding of the current transformer when the load is disconnected or removed for replacement. Since the high voltage is prevented from being generated and the magnetic flux is prevented from increasing, the electric shock and the overheat of the current transformer can be prevented, which is an excellent effect.
【図１】この発明の実施例の回路図FIG. 1 is a circuit diagram of an embodiment of the present invention.
【図２】電流位相図[Figure 2] Current phase diagram
【図３】従来装置の概略図FIG. 3 is a schematic view of a conventional device.
１ 給電線 ２ 電流トランス ３ 二
次巻線 ４ ハロゲンランプ １１ 定電流電源 １２ 給電線 １３ 電
流トランス １４ ２次巻線 １５ 放電管1 Feed line 2 Current transformer 3 Secondary winding 4 Halogen lamp 11 Constant current power supply 12 Feed line 13 Current transformer 14 Secondary winding 15 Discharge tube
Claims (1)
流トランスの一次巻線として巻回し、該電流トランスの
二次巻線の両端子間にコンデンサーと負荷とを並列に接
続することを特徴とする高周波定電流給電方式。1. A power supply line connected to a high frequency constant current power supply is wound as a primary winding of a current transformer, and a capacitor and a load are connected in parallel between both terminals of a secondary winding of the current transformer. High frequency constant current power supply method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5076479A JP2663232B2 (en) | 1993-03-11 | 1993-03-11 | High frequency constant current power supply method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5076479A JP2663232B2 (en) | 1993-03-11 | 1993-03-11 | High frequency constant current power supply method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06269124A true JPH06269124A (en) | 1994-09-22 |
| JP2663232B2 JP2663232B2 (en) | 1997-10-15 |
Family
ID=13606336
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5076479A Expired - Lifetime JP2663232B2 (en) | 1993-03-11 | 1993-03-11 | High frequency constant current power supply method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2663232B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7781916B2 (en) * | 2003-05-26 | 2010-08-24 | Auckland Uniservices Limited | Parallel-tuned pick-up system with multiple voltage outputs |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61106025A (en) * | 1984-10-25 | 1986-05-24 | 住友電気工業株式会社 | Branch type low voltage power supply device |
| JPS645360U (en) * | 1987-06-30 | 1989-01-12 | ||
| JPH01180152U (en) * | 1988-06-07 | 1989-12-25 |
-
1993
- 1993-03-11 JP JP5076479A patent/JP2663232B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61106025A (en) * | 1984-10-25 | 1986-05-24 | 住友電気工業株式会社 | Branch type low voltage power supply device |
| JPS645360U (en) * | 1987-06-30 | 1989-01-12 | ||
| JPH01180152U (en) * | 1988-06-07 | 1989-12-25 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7781916B2 (en) * | 2003-05-26 | 2010-08-24 | Auckland Uniservices Limited | Parallel-tuned pick-up system with multiple voltage outputs |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2663232B2 (en) | 1997-10-15 |
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