JPH0485699U - - Google Patents
Info
- Publication number
- JPH0485699U JPH0485699U JP12671990U JP12671990U JPH0485699U JP H0485699 U JPH0485699 U JP H0485699U JP 12671990 U JP12671990 U JP 12671990U JP 12671990 U JP12671990 U JP 12671990U JP H0485699 U JPH0485699 U JP H0485699U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- signal
- discharge lamp
- detection means
- chopper
- 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.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 5
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
Description
第１図は、従来の交流放電ランプ点灯装置の全
体の概略図、第２図は、本考案の交流放電ランプ
点灯装置の全体の概略図、第３図は、本考案の定
電力制御回路と、チヨツ駆動制御回路を示した図
、第４図は、電圧と電流の関係を示した図、第５
図は、従来の回路における制御状態を示すための
説明図、第６図は、放電ランプの点灯開始直後の
点灯電圧の変化を示したものである。
図中：１……放電ランプ、２……極性切替回路
、３……チヨツパー回路、４……チヨツパー駆動
制御回路、５……第２の電流検出手段、８……定
電力制御回路、９……基準値切替回路、３１……
第１のスイツチング素子、２１〜２４……第２の
スイツチング素子、ＴＭ……スイツチ回路。
FIG. 1 is an overall schematic diagram of a conventional AC discharge lamp lighting device, FIG. 2 is an overall schematic diagram of an AC discharge lamp lighting device of the present invention, and FIG. 3 is a constant power control circuit of the present invention. Figure 4 is a diagram showing the drive control circuit, and Figure 5 is a diagram showing the relationship between voltage and current.
The figure is an explanatory diagram showing the control state in a conventional circuit, and FIG. 6 shows the change in lighting voltage immediately after the discharge lamp starts lighting. In the figure: 1... discharge lamp, 2... polarity switching circuit, 3... chopper circuit, 4... chopper drive control circuit, 5... second current detection means, 8... constant power control circuit, 9... ...Reference value switching circuit, 31...
First switching element, 21-24... Second switching element, TM... Switch circuit.
Claims (1)
素子を有するチヨツパー回路と、 このチヨツパー回路の出力側に接続され、第２
スイツチング素子がフルブリツジ型に接続された
極性切替回路と、 この極性切替回路の出力側に接続されて、交流
点灯する放電ランプと、 チヨツパー回路と、極性切替回路の間に接続さ
れる電流検出手段と、 放電ランプの電圧を検出する電圧検出手段と、 第１のスイツチング素子を高周波でオン−オフ
制御するチヨツパー駆動制御回路と、 電流検出手段からの信号と、電圧検出手段から
の信号によつて、電力信号を作るとともに、この
電力信号を演算増幅気で制御して、さらにその出
力信号をチヨツパー駆動制御回路に送る定電力制
御回路と、 放電ランプが絶縁破壊した直後から、アーク放
電状態に移行して、一定の点灯電圧に上昇するま
での間、前記電圧検出手段からの信号を零に設定
するスイツチ回路と、 このスイツチ回路に設定された時間内において
、前記演算増幅器の基準値を通常時より高く設定
する基準値切替回路とを、 有することを特徴とする交流放電ランプ点灯装置
。 (2) 請求項第１項記載の交流放電ランプ点灯装
置において、 前記第１のスイツチング素子に流れる電流を検
出する第２の電流検出手段と有し、 前記チヨツパー駆動制御回路は、 前記第２の電流検出手段からの信号によつて、
所定のピーク電流値を検出するピーク電流制御を
行い、 前記定電力制御回路からの信号により、該所定
のピーク電流値を変えることによつて、 該放電ランプへの入力電力を制御する 手段を具備したことを特徴とする交流放電ランプ
点灯装置。 (3) 請求項(1)項記載の交流放電ランプ点灯装置
において、 前記演算増幅器は、 前記スイツチ回路に設定された時間内で、切り
替わる基準値を少なくとも二つ以上有することを
特徴とする交流放電ランプ点灯装置。[Claims for Utility Model Registration] (1) A chopper circuit connected to a DC power source and having a first switching element, and a second chopper circuit connected to the output side of the chopper circuit.
A polarity switching circuit in which switching elements are connected in a full bridge type; a discharge lamp connected to the output side of the polarity switching circuit and lit with alternating current; a chopper circuit; and a current detection means connected between the polarity switching circuit. , a voltage detection means for detecting the voltage of the discharge lamp; a chopper drive control circuit for controlling the first switching element on and off at high frequency; a signal from the current detection means and a signal from the voltage detection means; A constant power control circuit generates a power signal, controls this power signal using an operational amplifier, and sends the output signal to the chopper drive control circuit. a switch circuit that sets the signal from the voltage detection means to zero until the lighting voltage rises to a constant lighting voltage; and a switch circuit that sets the reference value of the operational amplifier to zero during the time set in this switch circuit. An AC discharge lamp lighting device comprising: a reference value switching circuit for setting a high reference value. (2) The AC discharge lamp lighting device according to claim 1, further comprising second current detection means for detecting the current flowing through the first switching element, and the chopper drive control circuit includes: By the signal from the current detection means,
Performing peak current control to detect a predetermined peak current value, and controlling the input power to the discharge lamp by changing the predetermined peak current value according to a signal from the constant power control circuit. An AC discharge lamp lighting device characterized by: (3) The AC discharge lamp lighting device according to claim (1), wherein the operational amplifier has at least two reference values that can be switched within a time set in the switch circuit. Lamp lighting device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12671990U JPH0485699U (en) | 1990-11-30 | 1990-11-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12671990U JPH0485699U (en) | 1990-11-30 | 1990-11-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0485699U true JPH0485699U (en) | 1992-07-24 |
Family
ID=31874260
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12671990U Pending JPH0485699U (en) | 1990-11-30 | 1990-11-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0485699U (en) |
-
1990
- 1990-11-30 JP JP12671990U patent/JPH0485699U/ja active Pending
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