JPH0547483A - Discharge lamp lighting device - Google Patents
Discharge lamp lighting deviceInfo
- Publication number
- JPH0547483A JPH0547483A JP19958591A JP19958591A JPH0547483A JP H0547483 A JPH0547483 A JP H0547483A JP 19958591 A JP19958591 A JP 19958591A JP 19958591 A JP19958591 A JP 19958591A JP H0547483 A JPH0547483 A JP H0547483A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- voltage
- discharge lamp
- switch element
- timer
- 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.)
- Withdrawn
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は放電灯の予熱時間を得る
予熱時間設定回路を備えた放電灯点灯装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge lamp lighting device having a preheating time setting circuit for obtaining a preheating time of a discharge lamp.
【０００２】[0002]
【従来の技術】図３は従来の放電灯点灯装置を示し、1
は交流電源、2 は全波整流回路、3 は蛍光灯等の放電
灯、4 はインバータ回路である。5,6,は平滑コンデン
サ、7 はサイリスタにより構成したスイッチ素子で、全
波整流回路2 とインバータ回路4 との間に直列に介装さ
れている。9 は抵抗、10は温度ヒューズで、これらの直
列回路がスイッチ素子7 に並列に接続されている。2. Description of the Related Art FIG. 3 shows a conventional discharge lamp lighting device.
Is an AC power supply, 2 is a full-wave rectifier circuit, 3 is a discharge lamp such as a fluorescent lamp, and 4 is an inverter circuit. Reference numerals 5 and 6 are smoothing capacitors, and 7 is a switch element composed of a thyristor, which is interposed in series between the full-wave rectifier circuit 2 and the inverter circuit 4. 9 is a resistor, 10 is a thermal fuse, and these series circuits are connected in parallel to the switch element 7.
【０００３】13は電源1 の定格電圧時に十分な予熱時間
を得るための予熱時間設定回路で、ＩＣ回路14と抵抗1
5,16,17,18 とダイオード19とツェナーダイオード20と
コンデンサ21,22 とを備える。25はタイマ回路で、抵抗
26,27,28、コンデンサ29、ホトカプラ30を備える。32は
抵抗、33は電源スイッチである。次に動作を説明する。
電源電圧の正常時及び低電圧時における交流電源1 の電
圧、ツェナーダイオード20の電圧、ＩＣ回路14のプラス
側の電圧、ＩＣ回路14のマイナス側の電圧、ＩＣ回路14
の出力電圧、ホトカプラ30の電圧及びスイッチ素子7 の
アノード、カソード間電圧は図４に示す電圧波形にな
る。即ち、定格電圧時には、電源スイッチ33の投入によ
って、全波整流回路2 の正側よりインバータ回路4 の正
側、放電灯3 、インバータ回路4 の負側、温度ヒューズ
10、抵抗9 を介して全波整流回路2 の負側に至る電流が
流れ、抵抗9 により放電灯3 に印加される電圧を下げ
て、放電灯3 の陰極を予熱しておき、一定時間経過後、
ＩＣ回路14の駆動信号の出力によってホトカプラ30をオ
ンさせ、これによりタイマ回路25を作動させ、スイッチ
素子7 をオンして放電灯3 を点灯させる。そして、スイ
ッチ素子7 等の部品が故障したとき、抵抗9 と抱きかか
えにしてある温度ヒューズ10が断線し、放電灯点灯装置
を保護する。Reference numeral 13 is a preheating time setting circuit for obtaining a sufficient preheating time at the rated voltage of the power source 1, which is an IC circuit 14 and a resistor 1
5,16,17,18, a diode 19, a Zener diode 20, and capacitors 21 and 22 are provided. 25 is a timer circuit, a resistor
26, 27, 28, a capacitor 29, and a photocoupler 30 are provided. 32 is a resistor and 33 is a power switch. Next, the operation will be described.
The voltage of the AC power supply 1, the voltage of the Zener diode 20, the voltage on the plus side of the IC circuit 14, the voltage on the minus side of the IC circuit 14, and the IC circuit 14 when the power supply voltage is normal and low.
Output voltage, the voltage of the photocoupler 30 and the voltage between the anode and cathode of the switch element 7 have the voltage waveforms shown in FIG. That is, at the rated voltage, by turning on the power switch 33, from the positive side of the full-wave rectifier circuit 2 to the positive side of the inverter circuit 4, the discharge lamp 3, the negative side of the inverter circuit 4, and the temperature fuse.
10, the current flowing to the negative side of the full-wave rectifier circuit 2 flows through the resistor 9, the voltage applied to the discharge lamp 3 is reduced by the resistor 9, the cathode of the discharge lamp 3 is preheated, and the fixed time elapses. rear,
The photocoupler 30 is turned on by the output of the drive signal of the IC circuit 14, thereby operating the timer circuit 25, turning on the switch element 7 and turning on the discharge lamp 3. Then, when a part such as the switch element 7 fails, the resistance 9 and the temperature fuse 10 held in between are disconnected to protect the discharge lamp lighting device.
【０００４】[0004]
【発明が解決しようとする課題】しかし、電源電圧が下
がり、ＩＣ回路14の不動作領域になると、ＩＣ回路14の
出力により、駆動していたスイッチ素子7 が一定時間経
過後もオンしなくなるので、放電灯3 の陰極を予熱した
ままで電流は温度ヒューズ10と抵抗9 とを流れ続けるた
め、温度ヒューズ10が断線する必要性がないにも拘わら
ず、抵抗9 が発熱し、温度ヒューズ10が断線した。However, when the power supply voltage is lowered and the IC circuit 14 is in the inoperative area, the output of the IC circuit 14 causes the switch element 7 that has been driven to not turn on even after a certain period of time elapses. , The current continues to flow through the thermal fuse 10 and the resistor 9 while preheating the cathode of the discharge lamp 3, so that the resistor 9 generates heat and the thermal fuse 10 does not need to be disconnected even though the thermal fuse 10 does not need to be disconnected. It was broken.
【０００５】本発明は上記問題点に鑑み、電源電圧が低
下して予熱時間設定回路が動作しなくなっても、ヒュー
ズ10が断線しないようにしたものである。In view of the above problems, the present invention prevents the fuse 10 from being broken even if the power supply voltage drops and the preheating time setting circuit does not operate.
【０００６】[0006]
【課題を解決するための手段】この技術的課題を解決す
る本発明の技術的手段は、交流電源1 に、整流回路2及
びインバータ回路4 を介して放電灯3 が接続され、整流
回路2 とインバータ回路4 との間に、スイッチ素子7 が
直列に介装され、該スイッチ素子7 に、抵抗9とヒュー
ズ10との直列回路が並列接続され、整流回路2 とインバ
ータ回路4 との間に、定格の電源電圧時に予熱時間を得
て駆動信号を出力する予熱時間設定回路13が設けられ、
前記予熱時間設定回路13の駆動信号を入力してスイッチ
素子7 をオンさせるタイマ回路25が設けられた放電灯点
灯装置において、電源電圧の低下時に、前記スイッチ素
子7 をオンさせるべくタイマ回路25を作動させるタイマ
作動回路37が設けられている点にある。The technical means of the present invention for solving this technical problem is that a discharge lamp 3 is connected to an AC power source 1 via a rectifier circuit 2 and an inverter circuit 4, and a rectifier circuit 2 and A switch element 7 is interposed in series with the inverter circuit 4, a series circuit of a resistor 9 and a fuse 10 is connected in parallel to the switch element 7, and between the rectifier circuit 2 and the inverter circuit 4, A preheat time setting circuit 13 is provided which outputs a drive signal by obtaining a preheat time at the rated power supply voltage,
In the discharge lamp lighting device provided with the timer circuit 25 for turning on the switch element 7 by inputting the drive signal of the preheating time setting circuit 13, the timer circuit 25 is turned on to turn on the switch element 7 when the power supply voltage drops. The point is that a timer operating circuit 37 for operating is provided.
【０００７】[0007]
【作用】ツェナーダイオード40により電源電圧を検出す
ることによって、ＩＣ回路14が動作しない低電源電圧時
には、平滑コンデンサ5,6にて平滑された電圧で、抵抗3
9とダイオード41,42 を介してホトカプラ30をオンさ
せ、これによりタイマ回路25を作動してスイッチ素子7
をオンし、抵抗9 による発熱を防ぐ。[Function] By detecting the power supply voltage by the Zener diode 40, when the IC circuit 14 does not operate at a low power supply voltage, the voltage smoothed by the smoothing capacitors 5 and 6 causes the resistance 3
9 turns on the photocoupler 30 via the diodes 41 and 42, which activates the timer circuit 25 to activate the switching element 7
Turn on to prevent heat generation by resistor 9.
【０００８】[0008]
【実施例】以下、本発明を図示の実施例に従って証明す
ると、図１に示すように全波整流回路2 とインバータ回
路4 との間に、電源電圧の低下時にスイッチ素子7 をオ
ンさせるべくタイマ回路25を作動させるタイマ作動回路
37を設け、該タイマ作動回路37を、抵抗38,39 、ツェナ
ーダイオード40、ダイオード41,42 及びトランジスタ43
により構成している。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be proved in accordance with the illustrated embodiment, and as shown in FIG. 1, a timer for turning on the switching element 7 between the full-wave rectifier circuit 2 and the inverter circuit 4 when the power supply voltage drops. Timer actuation circuit that activates circuit 25
The timer operating circuit 37 is provided with a resistor 38, 39, a Zener diode 40, a diode 41, 42 and a transistor 43.
It is composed by.
【０００９】次に動作を説明する。電源電圧の正常時及
び低電圧時における交流電源1 の電圧、ツェナーダイオ
ード20の電圧、ＩＣ回路14のプラス側の電圧、ＩＣ回路
14のマイナス側の電圧、ＩＣ回路14の出力電圧、ホトカ
プラ30の電圧及びスイッチ素子7 のアノード、カソード
間電圧は、図２に示す電圧波形になる。即ち、ＩＣ回路
14が正常に動作する電源電圧供給時には、電源スイッチ
33が投入されると、平滑コンデンサ5,6 の両端に直流電
圧が発生する。これによりツェナーダイオード40はツェ
ナー電圧を越え、抵抗38を介してトランジスタ43をドラ
イブする。このとき、点(A) の電位はダイオード41,42
により点(B) の電位よりも高くなるように設定してある
ため、抵抗39より供給される電流をＩＣ回路14に引き込
む。しかし、電源投入によりＩＣ回路14のマイナス側に
は抵抗15,16 により分圧された基準電圧が発生し、また
ＩＣ回路14のプラス側は、抵抗17とコンデンサ21で決ま
る時定数により電位が上昇してゆき、プラス側が基準電
圧以上になると、ＩＣ回路14が高電圧となる駆動信号を
出力し、その結果点(A) より点(B) の方が電位が高くな
り、トランジスタ46より引き込んでいた電流は、ダイオ
ード41,42 を介してホトカプラ30をオンさせ、タイマ回
路25を駆動する。Next, the operation will be described. AC power supply 1 voltage, Zener diode 20 voltage, IC circuit 14 plus side voltage, IC circuit when the power supply voltage is normal and low
The voltage on the negative side of 14, the output voltage of the IC circuit 14, the voltage of the photocoupler 30, and the voltage between the anode and cathode of the switch element 7 have the voltage waveforms shown in FIG. That is, IC circuit
When the power supply voltage is high enough for 14 to operate normally, the power switch
When 33 is turned on, a DC voltage is generated across the smoothing capacitors 5 and 6. This causes the Zener diode 40 to exceed the Zener voltage and drive the transistor 43 via the resistor 38. At this time, the potential at point (A) is
Since it is set to be higher than the potential of the point (B), the current supplied from the resistor 39 is drawn into the IC circuit 14. However, when the power is turned on, the reference voltage divided by the resistors 15 and 16 is generated on the negative side of the IC circuit 14, and the potential increases on the positive side of the IC circuit 14 due to the time constant determined by the resistor 17 and the capacitor 21. Then, when the voltage on the plus side becomes higher than the reference voltage, the IC circuit 14 outputs a high-voltage drive signal. As a result, the potential at the point (B) becomes higher than that at the point (A), and the voltage is pulled in from the transistor 46. The supplied current turns on the photocoupler 30 via the diodes 41 and 42 and drives the timer circuit 25.
【００１０】一方、ＩＣ回路14が正常動作しない低電源
電圧時ではツェナーダイオード40のツェナー電圧を越え
ないために、電源投入と共に抵抗39よりダイオード41,4
2 を介してホトカプラ30をオンさせ、強制的にスイッチ
素子7 を駆動させる。その結果、放電灯3 の予熱状態が
継続するのを防いで、抵抗9 が発熱して温度ヒューズ10
が断線するのを防止する。On the other hand, since the Zener voltage of the Zener diode 40 is not exceeded at a low power supply voltage at which the IC circuit 14 does not operate normally, the power supply is turned on and the resistors 39 and 41, 4 are connected by the resistor 39.
The photocoupler 30 is turned on via 2 to forcibly drive the switch element 7. As a result, the preheating state of the discharge lamp 3 is prevented, the resistor 9 generates heat and the thermal fuse 10
To prevent disconnection.
【００１１】[0011]
【発明の効果】電源電圧の低下時に、前記スイッチ素子
7 をオンさせるべくタイマ回路25を作動させるタイマ作
動回路37が設けられているので、電源電圧が低下して予
熱時間設定回路13が動作しなくなっても、強制的にスイ
ッチ素子7 をオンさせて、放電灯3 の予熱状態が継続す
るのを防ぐことができ、抵抗9 が発熱して温度ヒューズ
10が断線するのを未然に防止し得る。When the power supply voltage drops, the switch element
Since the timer operating circuit 37 that operates the timer circuit 25 to turn on 7 is provided, even if the preheating time setting circuit 13 does not operate due to a decrease in the power supply voltage, the switch element 7 is forcibly turned on. The discharge lamp 3 can be prevented from continuing to be preheated, and the resistor 9 generates heat
It is possible to prevent 10 from breaking.
【図１】本発明の一実施例を示す回路図である。FIG. 1 is a circuit diagram showing an embodiment of the present invention.
【図２】動作説明用の電圧波形図である。FIG. 2 is a voltage waveform diagram for explaining the operation.
【図３】従来例を示す回路図である。FIG. 3 is a circuit diagram showing a conventional example.
【図４】動作説明用の電圧波形図である。FIG. 4 is a voltage waveform diagram for explaining the operation.
1 交流電源 2 全波整流回路 3 放電灯 4 インバータ回路 7 スイッチ素子 9 抵抗 10 温度ヒューズ 13 予熱時間設定回路 25 タイマ回路 37 タイマ作動回路 1 AC power supply 2 Full-wave rectifier circuit 3 Discharge lamp 4 Inverter circuit 7 Switch element 9 Resistance 10 Temperature fuse 13 Preheating time setting circuit 25 Timer circuit 37 Timer operating circuit
Claims (1)
バータ回路(4) を介して放電灯(3) が接続され、整流回
路(2) とインバータ回路(4) との間に、スイッチ素子
(7) が直列に介装され、該スイッチ素子(7) に、抵抗
(9) とヒューズ(10)との直列回路が並列接続され、整流
回路(2) とインバータ回路(4) との間に、定格の電源電
圧時に予熱時間を得て駆動信号を出力する予熱時間設定
回路(13)が設けられ、前記予熱時間設定回路(13)の駆動
信号を入力してスイッチ素子(7) をオンさせるタイマ回
路(25)が設けられた放電灯点灯装置において、電源電圧
の低下時に、前記スイッチ素子(7) をオンさせるべくタ
イマ回路(25)を作動させるタイマ作動回路(37)が設けら
れていることを特徴とする放電灯点灯装置1. A discharge lamp (3) is connected to an AC power source (1) via a rectifier circuit (2) and an inverter circuit (4), and is connected between the rectifier circuit (2) and the inverter circuit (4). , Switch element
(7) is inserted in series, and a resistor is connected to the switch element (7).
(9) and fuse (10) series circuit is connected in parallel, between the rectifier circuit (2) and the inverter circuit (4), the preheat time to obtain the preheat time at the rated power supply voltage and output the drive signal. In a discharge lamp lighting device provided with a setting circuit (13) and a timer circuit (25) for turning on the switch element (7) by inputting the drive signal of the preheating time setting circuit (13), A discharge lamp lighting device characterized in that a timer operating circuit (37) for operating a timer circuit (25) to turn on the switch element (7) when the voltage drops is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19958591A JPH0547483A (en) | 1991-08-08 | 1991-08-08 | Discharge lamp lighting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19958591A JPH0547483A (en) | 1991-08-08 | 1991-08-08 | Discharge lamp lighting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0547483A true JPH0547483A (en) | 1993-02-26 |
Family
ID=16410296
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19958591A Withdrawn JPH0547483A (en) | 1991-08-08 | 1991-08-08 | Discharge lamp lighting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0547483A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USRE41575E1 (en) * | 1998-06-02 | 2010-08-24 | Osamu Yamamoto | Crystalline turbostratic boron nitride powder and method for producing same |
-
1991
- 1991-08-08 JP JP19958591A patent/JPH0547483A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USRE41575E1 (en) * | 1998-06-02 | 2010-08-24 | Osamu Yamamoto | Crystalline turbostratic boron nitride powder and method for producing same |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5023516A (en) | Discharge lamp operation apparatus | |
| US5883473A (en) | Electronic Ballast with inverter protection circuit | |
| US5770925A (en) | Electronic ballast with inverter protection and relamping circuits | |
| US5767631A (en) | Power supply and electronic ballast with low-cost inverter bootstrap power source | |
| US5869935A (en) | Electronic ballast with inverter protection circuit | |
| US5461287A (en) | Booster driven inverter ballast employing the output from the inverter to trigger the booster | |
| EP0242022B1 (en) | Device for limiting surge current | |
| JP4145795B2 (en) | Short circuit ballast protection | |
| US6043612A (en) | Electronic ballast with automatic restarting | |
| JPH0547483A (en) | Discharge lamp lighting device | |
| JP2001068287A (en) | Ballast shutdown circuit for gas discharge lamp | |
| EP1521508A1 (en) | Method and apparatus for a unidirectional switching, current limited cutoff circuit for an electronic ballast | |
| JPS63209467A (en) | Switching power source | |
| JP2506966B2 (en) | Discharge lamp lighting device | |
| KR100297001B1 (en) | Electric equipment control circuit | |
| JPH0210699A (en) | Lighting device | |
| JP2754576B2 (en) | Discharge lamp lighting device | |
| KR0129656Y1 (en) | Fluorescent lamp starting device | |
| JP3336042B2 (en) | Discharge lamp lighting device | |
| KR19980024273A (en) | Discharge lamp lighting device | |
| JPH07176390A (en) | Electric discharge lamp lighting device | |
| KR200285081Y1 (en) | A Circuit For Instantly Starting A Fluorescent Lamp In Non-Contact Way | |
| TW541857B (en) | Fully integrated ballast IC | |
| KR0134943Y1 (en) | Preheating type fluorescent lamp of starter | |
| JP2001110585A (en) | Discharge lamp lightening apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19981112 |