JPH05290986A - Discharge lamp lighting circuit - Google Patents

Discharge lamp lighting circuit

Info

Publication number
JPH05290986A
JPH05290986A JP4091108A JP9110892A JPH05290986A JP H05290986 A JPH05290986 A JP H05290986A JP 4091108 A JP4091108 A JP 4091108A JP 9110892 A JP9110892 A JP 9110892A JP H05290986 A JPH05290986 A JP H05290986A
Authority
JP
Japan
Prior art keywords
full
inverter
voltage
discharge lamp
wave
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Withdrawn
Application number
JP4091108A
Other languages
Japanese (ja)
Inventor
Takahiro Hara
隆裕 原
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Life Solutions Ikeda Electric Co Ltd
Original Assignee
Ikeda Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ikeda Electric Co Ltd filed Critical Ikeda Electric Co Ltd
Priority to JP4091108A priority Critical patent/JPH05290986A/en
Publication of JPH05290986A publication Critical patent/JPH05290986A/en
Withdrawn legal-status Critical Current

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  • Circuit Arrangements For Discharge Lamps (AREA)
  • Inverter Devices (AREA)

Abstract

PURPOSE:To improve the input power factor, and to sufficiently reduce higher harmonic components. CONSTITUTION:A full-wave rectification circuit 22 for full-wave rectifying an ac power source 21 is provided, and the full-wave rectification voltage of a full-wave rectification circuit 22 is input to an inverter 23, from which high frequency voltage is applied to a discharge lamp 24, and the discharge lamp 24 is thereby lighted. In this discharge lamp lighting circuit, a dc power source 26 is provided between the full-wave rectification circuit 22 and the inverter 23, for inputting voltage to the inverter 23 by being superimposed on the trough parts of the full-wave rectification voltage so that the trough parts of the full- wave rectification voltage is filled in therewith.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、インバータ回路を介し
て放電灯を点灯させるようにした放電灯点灯回路に関す
る。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge lamp lighting circuit for lighting a discharge lamp via an inverter circuit.

【0002】[0002]

【従来の技術】放電灯点灯回路には、図5に示すように
交流電源1 を全波整流する全波整流回路2 を備え、この
全波整流回路2 の全波整流電圧をインバータ3 に入力
し、インバータ3 から放電灯4 に高周波電圧を印加して
該放電灯4 を点灯させるようにしたものがあり、この種
の従来の放電灯点灯回路には、同図に示すように全波整
流回路2 とインバータ3 との間にダイオード5 とコンデ
ンサ6 とを設けると共に、インバータ5 のトランス7 か
ら低電圧交流を取出すコイル8 を設け、コイル8 により
全波整流回路9 により整流してコンデンサ6 を充電する
ようにしたものがある(例えば実開平2−97892)。
2. Description of the Related Art A discharge lamp lighting circuit is provided with a full-wave rectifier circuit 2 for full-wave rectifying an AC power source 1 as shown in FIG. 5, and the full-wave rectified voltage of this full-wave rectifier circuit 2 is input to an inverter 3. However, there is one in which a high frequency voltage is applied from the inverter 3 to the discharge lamp 4 to light the discharge lamp 4, and a conventional discharge lamp lighting circuit of this type has a full-wave rectification as shown in the figure. A diode 5 and a capacitor 6 are provided between the circuit 2 and the inverter 3, and a coil 8 for extracting a low-voltage alternating current from the transformer 7 of the inverter 5 is provided.The coil 8 rectifies the capacitor 6 by the full-wave rectifier circuit 9 to form the capacitor 6. Some are designed to be recharged (eg, Kaikaihei 2-97892).

【0003】この放電灯点灯回路の動作を説明すると、
全波整流回路2 の出力端子A,B側には、図6(a) に示
すように全波整流電圧VB が現われる。コンデンサの両
端電圧VC は図6(c) に示す波形、インバータ3 の入力
電圧VA は図6(b) に示す波形になる。そして、図5に
示す(I)(II) のループで電流が流れ、インバータ3 の入
力電流は図6(d) に示すようになり、休止区間がなくな
り、入力力率を高めることができる。また、この回路全
体の出力電圧、即ちインバータ3 への入力電圧VA は図
6(b) で示す如く平滑された直流電圧となり、その出力
電圧VA はOVまで低下することがないので、インバー
タ3 を安定して動作させることができる。
The operation of this discharge lamp lighting circuit will be described below.
A full-wave rectified voltage V B appears at the output terminals A and B of the full-wave rectifier circuit 2 as shown in FIG. 6 (a). The voltage V C across the capacitor has the waveform shown in FIG. 6 (c), and the input voltage V A of the inverter 3 has the waveform shown in FIG. 6 (b). Then, a current flows in the loops of (I) and (II) shown in FIG. 5, the input current of the inverter 3 becomes as shown in FIG. 6 (d), the idle section is eliminated, and the input power factor can be increased. Further, the output voltage of the entire circuit, that is, the input voltage V A to the inverter 3 becomes a smoothed DC voltage as shown in FIG. 6 (b), and the output voltage V A does not drop to OV. 3 can be operated stably.

【0004】[0004]

【発明が解決しようとする課題】しかし、従来の場合イ
ンバータ3 への入力電圧VA は図6(b) に示すように、
交流電源1 の半サイクル毎に谷部が生じ、これがインバ
ータ3 に入力するため、従来の放電灯点灯回路では入力
力率を高めることができるが、高調波成分の低減が十分
でなく、まだ高調波成分が多いという問題があった。
However, in the conventional case, the input voltage V A to the inverter 3 is as shown in FIG. 6 (b).
A valley occurs every half cycle of the AC power supply 1 and is input to the inverter 3, so the input power factor can be increased in the conventional discharge lamp lighting circuit, but the harmonic components are not sufficiently reduced and the There was a problem that there were many wave components.

【0005】なお、放電灯点灯回路では、IEC、フラ
スCの規格により高調波を少なくする要望がある(第3
高調波30%以下、第5高調波10%以下、第7高調波5%
以下、第9高調波3%以下) 。本発明は上記問題点に鑑
み、入力力率を高めると同時に高調波成分を十分低減し
得るようにしたものである。
In the discharge lamp lighting circuit, there is a demand for reducing harmonics according to the standards of IEC and Fras C (3rd.
Harmonics 30% or less, 5th harmonics 10% or less, 7th harmonics 5%
Below, 9th harmonic 3% or less). In view of the above-mentioned problems, the present invention is capable of increasing the input power factor and at the same time sufficiently reducing harmonic components.

【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
るための本発明の第1の技術的手段は、交流電源21を全
波整流する全波整流回路22を備え、この全波整流回路22
の全波整流電圧をインバータ23に入力し、インバータ23
から放電灯24に高周波電圧を印加して該放電灯24を点灯
させるようにした放電灯点灯回路において、全波整流回
路22とインバータ23との間に、全波整流回路22の全波整
流電圧の谷部を埋めるように該全波整流電圧の谷部に重
畳してインバータ23に電圧を入力する直流電源26が設け
られている点にあり、また、第2の技術的手段は、交流
電源21を全波整流する全波整流回路22を備え、この全波
整流回路22の全波整流電圧をインバータ23に入力し、イ
ンバータ23から放電灯24に高周波電圧を印加して該放電
灯24を点灯させるようにした放電灯点灯回路において、
全波整流回路22とインバータ23との間に、全波整流回路
22の全波整流電圧に重畳してインバータ23に電圧を入力
する直流電源26が設けられ、直流電源26に、インバータ
23への入力電流が設定レベル以下のときにオンするスイ
ッチ29が設けられている点にある。
The first technical means of the present invention for solving this technical problem comprises a full-wave rectifying circuit 22 for full-wave rectifying an AC power supply 21, and this full-wave rectifying circuit is provided. twenty two
Input the full-wave rectified voltage of the
In the discharge lamp lighting circuit that applies a high frequency voltage to the discharge lamp 24 to light the discharge lamp 24, between the full-wave rectifier circuit 22 and the inverter 23, the full-wave rectified voltage of the full-wave rectifier circuit 22. The DC power source 26 for inputting the voltage to the inverter 23 is provided so as to be superimposed on the valley portion of the full-wave rectified voltage so as to fill the valley portion of the AC power source, and the second technical means is the AC power source. A full-wave rectifier circuit 22 for full-wave rectifying 21 is provided, the full-wave rectified voltage of the full-wave rectifier circuit 22 is input to the inverter 23, and a high-frequency voltage is applied from the inverter 23 to the discharge lamp 24 to discharge the discharge lamp 24. In the discharge lamp lighting circuit that was made to light,
Between the full-wave rectifier circuit 22 and the inverter 23, a full-wave rectifier circuit
A DC power supply 26 for inputting the voltage to the full-wave rectified voltage of 22 to input the voltage to the inverter 23 is provided.
The point is that a switch 29 is provided which is turned on when the input current to 23 is below a set level.

【0007】[0007]

【作用】全波整流回路22からの全波整流電圧は半サイク
ル毎に谷部を生じるが、この谷部を直流電源26の電圧で
埋めて、谷部のなく全波整流電圧をインバータ23に入力
することができ、これによって高調波成分を大幅に低減
できる。
[Function] The full-wave rectified voltage from the full-wave rectification circuit 22 has a valley portion every half cycle. The valley portion is filled with the voltage of the DC power supply 26, and the full-wave rectified voltage is supplied to the inverter 23 without the valley portion. It can be input, and harmonic components can be significantly reduced.

【0008】[0008]

【実施例】以下、本発明を図示の実施例に従って説明す
ると、図1において、21は商用交流電源、22はダイオー
ドブリッジで構成した全波整流回路、23はインバータ、
24はインバータ23によって高周波点灯される放電灯であ
る。26は全波整流回路22とインバータ23との間に設けた
直流電源で、全波整流回路22の全波整流電圧に重畳して
電圧をインバータ23に入力する。27はインバータ23に入
力する入力電流を検出する検出抵抗である。28はダイオ
ード、29は直流電源26に直列に設けたスイッチで、図示
省略の制御回路の制御によって、検出抵抗27で検出した
インバータ23への入力電流が所定レベル以下のときオン
するように構成されている。
DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. In FIG. 1, 21 is a commercial AC power supply, 22 is a full-wave rectifier circuit composed of a diode bridge, 23 is an inverter,
Reference numeral 24 is a discharge lamp that is turned on at a high frequency by the inverter 23. Reference numeral 26 denotes a DC power supply provided between the full-wave rectifier circuit 22 and the inverter 23, which superimposes the full-wave rectified voltage of the full-wave rectifier circuit 22 and inputs the voltage to the inverter 23. Reference numeral 27 is a detection resistor for detecting the input current input to the inverter 23. 28 is a diode, 29 is a switch provided in series with the DC power supply 26, and is configured to turn on when the input current to the inverter 23 detected by the detection resistor 27 is below a predetermined level by the control of a control circuit (not shown). ing.

【0009】次に動作を説明すると、交流電源21が図2
(a) に示すような電源電圧VA を出力すると、全波整流
回路22の全波整流電圧VB は図2(b) を示すように半サ
イクル毎にOVになる谷部を生じる。ところが検出抵抗
27がインバータ23に入力する入力電流を検出し、この入
力電流が予め設定した設定レベル以下より低くなると、
スイッチ29がオンして、直流電源26の電圧がインバータ
23に印加するため、直流電源26の電圧が全波整流電圧V
B の谷部を埋めるように作用し、点A, C間のインバー
タ23への入力電圧VC は、図2(c) に示すように谷部の
ない全波整流電圧となる。
Next, the operation will be described.
When the power supply voltage V A as shown in (a) is output, the full-wave rectified voltage V B of the full-wave rectifier circuit 22 has a valley portion which becomes OV every half cycle as shown in FIG. 2 (b). However, the detection resistance
27 detects the input current input to the inverter 23, and when this input current becomes lower than a preset set level,
Switch 29 turns on and the voltage of DC power supply 26
The voltage of the DC power supply 26 is applied to the full-wave rectified voltage V
The input voltage V C to the inverter 23 between the points A and C acts so as to fill the valley of B and becomes a full-wave rectified voltage without a valley as shown in FIG. 2 (c).

【0010】図3は本発明の具体的回路を示し、同図に
おいて、前記スイッチ29を電界効果トランジスタにより
構成すると共に、直流電源26をコンデンサにより構成
し、インバータ23のトランス31から低電圧交流を取出す
コイル32を設け、該コイル32により取出した低電圧交流
を全波整流回路33により整流してコンデンサにより構成
した直流電源26を充電するようにしている。また、検出
抵抗27で検出したインバータ23への入力電流と、ツェナ
ーダイオード35によって設定した設定レベルとを、コン
パレータ36で比較し、入力電流が設定レベル以下であれ
ば、スイッチ29をオンするように構成している。コンパ
レータ37は電源電圧の谷部のみ設定電圧がでる目的で用
いている。インバータ23の出力側には一対の放電灯24a,
24b を接続している。そして、交流電源21の交流電圧V
A が図4(a) に示す波形であると、点A, B間の全波整
流回路22の全波整流電圧VB は図4(b) に示す波形にな
り、点A, C間のインバータ23への入力電圧VC は図4
(c) に示す波形になる。また点Dと接地間の電圧(設定
レベルの電圧) は、図4(d) に示す波形、点Eの電圧は
図4(e) に示す波形、交流電源21からインバータ23側へ
の入力電流Iinは図4(f) に示す波形、放電灯24a に流
れる放電灯電流Ilaは、図4(g) に示す波形となる。
FIG. 3 shows a concrete circuit of the present invention. In FIG. 3, the switch 29 is composed of a field effect transistor, the DC power supply 26 is composed of a capacitor, and a low voltage AC is supplied from a transformer 31 of an inverter 23. A coil 32 for taking out is provided, and the low-voltage alternating current taken out by the coil 32 is rectified by the full-wave rectifying circuit 33 to charge the DC power source 26 composed of a capacitor. Further, the input current to the inverter 23 detected by the detection resistor 27 and the set level set by the Zener diode 35 are compared by the comparator 36. If the input current is less than the set level, the switch 29 is turned on. I am configuring. The comparator 37 is used for the purpose of producing the set voltage only in the valley portion of the power supply voltage. On the output side of the inverter 23, a pair of discharge lamps 24a,
24b is connected. Then, the AC voltage V of the AC power supply 21
When A has the waveform shown in FIG. 4 (a), the full-wave rectified voltage V B of the full-wave rectification circuit 22 between points A and B has the waveform shown in FIG. 4 (b), and between points A and C. The input voltage V C to the inverter 23 is shown in FIG.
The waveform is as shown in (c). The voltage between point D and ground (voltage at the set level) is the waveform shown in Fig. 4 (d), the voltage at point E is the waveform shown in Fig. 4 (e), the input current from the AC power supply 21 to the inverter 23 side. Iin has the waveform shown in FIG. 4 (f), and the discharge lamp current Ila flowing through the discharge lamp 24a has the waveform shown in FIG. 4 (g).

【0011】[0011]

【発明の効果】本発明によれば、直流電源26によって、
全波整流回路22の全波整流電圧の谷部を埋めて、谷部の
ない全波整流電圧をインバータ23に入力することができ
る。従って、交流電源からの入力電流の休止区間をなく
して入力力率を高めることができると同時に、高調波成
分を十分に低減させることができる。
According to the present invention, the DC power supply 26
The valley portion of the full-wave rectified voltage of the full-wave rectification circuit 22 can be filled and the full-wave rectified voltage without the valley portion can be input to the inverter 23. Therefore, the input power factor can be increased by eliminating the pause section of the input current from the AC power source, and at the same time, the harmonic component can be sufficiently reduced.

【図面の簡単な説明】[Brief description of drawings]

【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】動作説明用の波形図である。FIG. 2 is a waveform diagram for explaining the operation.

【図3】本発明の具体的実施例を示す回路図である。FIG. 3 is a circuit diagram showing a specific embodiment of the present invention.

【図4】動作説明用の波形図である。FIG. 4 is a waveform diagram for explaining the operation.

【図5】従来例を示す回路図である。FIG. 5 is a circuit diagram showing a conventional example.

【図6】動作説明用の波形図である。FIG. 6 is a waveform diagram for explaining the operation.

【符号の説明】[Explanation of symbols]

21 商用交流電源 22 全波整流回路 23 インバータ 24 放電灯 26 直流電源 33 全波整流回路 21 Commercial AC power supply 22 Full-wave rectifier circuit 23 Inverter 24 Discharge lamp 26 DC power supply 33 Full-wave rectifier circuit

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 交流電源(21)を全波整流する全波整流回
路(22)を備え、この全波整流回路(22)の全波整流電圧を
インバータ(23)に入力し、インバータ(23)から放電灯(2
4)に高周波電圧を印加して該放電灯(24)を点灯させるよ
うにした放電灯点灯回路において、 全波整流回路(22)とインバータ(23)との間に、全波整流
回路(22)の全波整流電圧の谷部を埋めるように該全波整
流電圧の谷部に重畳してインバータ(23)に電圧を入力す
る直流電源(26)が設けられていることを特徴とする放電
灯点灯回路。
1. A full-wave rectifier circuit (22) for full-wave rectifying an AC power supply (21), wherein the full-wave rectified voltage of this full-wave rectifier circuit (22) is input to an inverter (23). ) To discharge lamp (2
In a discharge lamp lighting circuit in which a high frequency voltage is applied to 4) to light the discharge lamp (24), a full wave rectification circuit (22) is provided between the full wave rectification circuit (22) and the inverter (23). ), A DC power supply (26) for inputting the voltage to the inverter (23) is provided so as to fill the valley of the full-wave rectified voltage. Electric lighting circuit.
【請求項2】 交流電源(21)を全波整流する全波整流回
路(22)を備え、この全波整流回路(22)の全波整流電圧を
インバータ(23)に入力し、インバータ(23)から放電灯(2
4)に高周波電圧を印加して該放電灯(24)を点灯させるよ
うにした放電灯点灯回路において、 全波整流回路(22)とインバータ(23)との間に、全波整流
回路(22)の全波整流電圧に重畳してインバータ(23)に電
圧を入力する直流電源(26)が設けられ、直流電源(26)
に、インバータ(23)への入力電流が設定レベル以下のと
きにオンするスイッチ(29)が設けられていることを特徴
とする放電灯点灯回路。
2. A full-wave rectifier circuit (22) for full-wave rectifying an AC power source (21), wherein the full-wave rectified voltage of this full-wave rectifier circuit (22) is input to an inverter (23). ) To discharge lamp (2
In a discharge lamp lighting circuit in which a high frequency voltage is applied to 4) to light the discharge lamp (24), a full wave rectification circuit (22) is provided between the full wave rectification circuit (22) and the inverter (23). ) Is provided with a DC power supply (26) that superimposes it on the full-wave rectified voltage and inputs the voltage to the inverter (23).
The discharge lamp lighting circuit is characterized in that a switch (29) is provided which is turned on when the input current to the inverter (23) is below a set level.
JP4091108A 1992-04-10 1992-04-10 Discharge lamp lighting circuit Withdrawn JPH05290986A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4091108A JPH05290986A (en) 1992-04-10 1992-04-10 Discharge lamp lighting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4091108A JPH05290986A (en) 1992-04-10 1992-04-10 Discharge lamp lighting circuit

Publications (1)

Publication Number Publication Date
JPH05290986A true JPH05290986A (en) 1993-11-05

Family

ID=14017334

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4091108A Withdrawn JPH05290986A (en) 1992-04-10 1992-04-10 Discharge lamp lighting circuit

Country Status (1)

Country Link
JP (1) JPH05290986A (en)

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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: 19990706