JPH01128395A - Dimmer for lamp - Google Patents

Dimmer for lamp

Info

Publication number
JPH01128395A
JPH01128395A JP62285816A JP28581687A JPH01128395A JP H01128395 A JPH01128395 A JP H01128395A JP 62285816 A JP62285816 A JP 62285816A JP 28581687 A JP28581687 A JP 28581687A JP H01128395 A JPH01128395 A JP H01128395A
Authority
JP
Japan
Prior art keywords
lamp
voltage
comparator
frequency
transistor
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
Application number
JP62285816A
Other languages
Japanese (ja)
Inventor
Shigeo Hamamoto
浜本 茂生
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP62285816A priority Critical patent/JPH01128395A/en
Publication of JPH01128395A publication Critical patent/JPH01128395A/en
Pending legal-status Critical Current

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  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

PURPOSE:To obtain a dimmer with a reduced light quantity ripple, in a switching element for controlling a lamp load, by controlling a pulse width with a higher frequency than that of a power source in such a way that the larger an A.C. voltage instantaneous value is, the shorter an on pulse width is. CONSTITUTION:The current from a commercial power source 1 is rectified with a full wave rectifier 2 and added to a load lamp 3 and transistor 4, then according to the on-off, the current of the lamp 3 is controlled as follows. A full wave rectified voltage 7 synchronized with the frequency of the power source 1 is inputted the (-) terminal of a comparator 5 and a triangle wave voltage 6 with a frequency of several KHz is inputted the (+) terminal of the comparator 5. Thereby, from the comparator 5, the pulse having the characteristic in that the higher the instantaneous value of the full wave rectified voltage is, the narrower the pulse width is. A transistor 4, that is, the lamp 3 is turned on by the above pulse. Accordingly, it is possible to reduce the light quantity ripple about three times than in convential method.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明は複写機や原稿読取り装置などのランプに供給
され電流を制御するランプ調光装置に関するものである
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lamp dimming device that controls the current supplied to a lamp of a copying machine, document reading device, or the like.

〔従来の技術〕[Conventional technology]

第3図(、)は例えば従来のランプ調光装置を示す回路
図であり、図において、illに商用電源、(3)はラ
ンフなどの負荷、+51Hコンパレータ、(1118−
1daを制限する抵抗器1、α21は直流電源、04)
はランプ(3)に供給される電流を制御するトライアッ
ク、Ooは抵抗器2、α61に抵抗器3、Q7)iトラ
イアック(14)をターンオンさせるフォトトライアッ
クカプラ−1賭ハランプ(3)に供給される交流電圧を
設定するための設定電圧、α■1用電源+11の周波数
に同期した基準となる三角波電圧2である。
FIG. 3 (,) is a circuit diagram showing, for example, a conventional lamp dimming device. In the figure, ill is a commercial power supply, (3) is a load such as a lamp, a +51H comparator, (1118-
Resistor 1 that limits 1da, α21 is a DC power supply, 04)
is the triac that controls the current supplied to the lamp (3), Oo is the resistor 2, α61 is the resistor 3, Q7) i is the phototriac coupler 1 that turns on the triac (14), and is supplied to the lamp (3). This is a triangular wave voltage 2 which is a reference voltage synchronized with the frequency of the power supply for α■1 +11, which is a set voltage for setting the AC voltage.

第3図(b)に従来のランプ調光装置の波形図を示した
もので、図において、−に萌用酸源の波形、盟)に第3
図(、)のD点の波形、いに第3図(、)のE点の波形
、(ハ)は第3図(、)のF点の波形である。
Figure 3(b) shows a waveform diagram of a conventional lamp dimmer.
Figure 3 (,) shows the waveform at point D, Figure 3 (,) shows the waveform at point E, and (c) shows the waveform at point F in Figure 3 (,).

次に動作について説明する。Next, the operation will be explained.

図において、商用電源tl+が負荷ランプ(3)とトラ
イアック(14)に印加された状態において、商用電源
111に同期した三角波電圧209) 全コンパレータ
(5)のe入力端子に、設定電圧θ粉ヲコンパレータ(
61の■入力端子にそれぞれ入力し、両名の入力電圧を
コンパレータ(6)によって比較する。上記コンパレー
タ(6)の出力はO入力端子に入力され、る設定電圧α
橢よりθ入力端子に入力される三角波電圧2 Q91が
犬きくなったときに°゛L″L″レベル。それによって
、フォトトライアックカプラ−(Iηの入力側に電流電
流し、出力側のトライアックがターンオンし、その出力
′電流によってトライアック(14)が引き続きターン
オンして上記負荷のランプ(3)に電流を流して、負荷
ランプに交流電圧を供給する。
In the figure, when the commercial power supply tl+ is applied to the load lamp (3) and the triac (14), the set voltage comparator(
61, and the input voltages of both are compared by a comparator (6). The output of the comparator (6) is input to the O input terminal, and the set voltage α
When the triangular wave voltage 2 inputted from the θ input terminal to the θ input terminal becomes high, the level becomes ゛L''L'' level. As a result, a current flows to the input side of the phototriac coupler (Iη, the triac on the output side turns on, and the triac (14) continues to turn on due to the output current, causing current to flow to the lamp (3) of the load). to supply AC voltage to the load lamp.

このような動作を商用電源(1)の全波形において繰り
返し行っていた。つまり、トライアック(14)による
位相制御方式を用いていた。
Such operations were repeated for all waveforms of the commercial power source (1). In other words, a phase control method using a triac (14) was used.

商用電源il+の波形Hl 、 D点の波形圓、E点の
波形[、F点の波形−の関係を合せて波形図に示しであ
る。
The relationship between the waveform Hl of the commercial power source il+, the waveform circle at point D, the waveform at point E, and the waveform at point F are shown in the waveform diagram.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

従来のランプ調光装置は以上のように構成されており、
商用電源をトライアックの位相制御方式によって負荷ラ
ンプに電流を供給しているために曲用電源の半周期に1
回だけオンする制御方式であり、どうしても曲用電源周
波数に同期して負荷ランプの光量に大きなリップルが見
られ、コピーの高速化やCCD等の読み取りやコピーの
画質向上のために、この光t IJワッブル改善するこ
とが必要であった。
The conventional lamp dimmer device is configured as described above.
Since the commercial power supply is supplied with current to the load lamp using the triac phase control method, the current is
This is a control method that turns on only once, and a large ripple is inevitably seen in the light intensity of the load lamp in synchronization with the music power supply frequency. It was necessary to improve the IJ wobble.

この発明はこのような光量リップルを改善するためにな
されたもので、コピーの画質向上およびその高速化、さ
らにi CCDによる画像読み取り用光源として利用で
きるランプ調光装置を得ることを目的とする。
The present invention was made to improve such light intensity ripples, and aims to improve the image quality and speed of copying, and to provide a lamp dimming device that can be used as a light source for image reading by iCCD.

〔問題点を解決するための手段〕[Means for solving problems]

この発明に係るランプ調光装置はトランジスタ等の高周
波スイッチング素子により、ランプの通電を制御するよ
うにし、交流電源電圧瞬時値を検出しながらPWM方式
により、スイッチング素子のオンオフを制御するように
したものである。
The lamp dimming device according to the present invention controls the energization of the lamp using a high frequency switching element such as a transistor, and controls the on/off of the switching element using a PWM method while detecting the instantaneous value of the AC power supply voltage. It is.

〔作用〕[Effect]

この発明におけるスイッチング素子の制御部は、交流電
源電圧瞬時値の検出値の高いところiONパルス幅を短
かく、低いところiONパルス幅ケ広くするように商用
周波よりも高い周波数でPWM制御される。
The control section of the switching element in the present invention performs PWM control at a frequency higher than the commercial frequency so as to shorten the iON pulse width where the detected instantaneous value of the AC power supply voltage is high, and widen the iON pulse width where the detected value is low.

〔実施例〕〔Example〕

以下、この発明の一実施例を図について説明する。第1
図において、(2)は全波整流器、(4)は負荷のラン
プ(3)に供給される電流を制御するトランジスタ、+
61Hランプ(3)に供給される交流電圧を設定するた
めの三角波電圧1.+71H商用電源11+に同期した
交流余波整流電圧、(8)に第1図(、)A点の波形、
(9)は第1図(8)のB点の波形、QOl ta 第
1図(、)の0点の波形である。なお、図中、前記従来
装置と同一部分、または相当部分には同一符号を付しで
ある。
An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, (2) is a full-wave rectifier, (4) is a transistor that controls the current supplied to the load lamp (3), and +
Triangular wave voltage for setting the AC voltage supplied to the 61H lamp (3) 1. +71H AC aftereffect rectified voltage synchronized with commercial power supply 11+, (8) shows the waveform at point A in Figure 1 (,),
(9) is the waveform at point B in FIG. 1 (8), and the waveform at point 0 in FIG. 1 (,). In the drawings, the same or equivalent parts as those of the conventional device are given the same reference numerals.

上記のように構成されたこの発明のランプ調光装置にお
いて、商用電源(1)を全波整流器(2)に通して整流
し、その整流電圧を負荷ランプ(31とトランジスタ(
4)に印加し、負荷ラング(3)に供給する電流の制御
を上記トランジスタ(4)のON −OFF動作によっ
て行っている。
In the lamp dimmer of the present invention configured as described above, the commercial power source (1) is rectified by passing it through the full-wave rectifier (2), and the rectified voltage is applied to the load lamp (31) and the transistor (2).
4) and the current supplied to the load rung (3) is controlled by the ON/OFF operation of the transistor (4).

り1す、上記商用電源il+の周波数と同期した交流余
波整流電圧(7)をコンパレータ(5)のO入力端子に
、周波数がeKHz程度の三角波電圧1(6)を上記コ
ンパレータ(5)のO入力端子にそオ]、ぞれ入力し、
両名の入力端子を比較する。上記コンパレータ(6)の
出力は、■入力端子に入力される三角波電圧1(61が
O入力端子に入力される交流余波整流電圧(7)より大
きいときにIIH11レベルになり、逆のとき°L°。
1, the AC aftereffect rectified voltage (7) synchronized with the frequency of the commercial power supply il+ is applied to the O input terminal of the comparator (5), and the triangular wave voltage 1 (6) with a frequency of about eKHz is applied to the O input terminal of the comparator (5). into the input terminals, respectively.
Compare both input terminals. The output of the comparator (6) becomes the IIH11 level when the triangular wave voltage 1 (61) input to the input terminal is larger than the AC aftereffect rectified voltage (7) input to the O input terminal, and °L when the opposite is the case. °.

レベルになる。この′H°“と°L′′の繰り返しを上
記三角波電圧1(6)と同じ高い周波数で行うことにな
る。以上の関係を舅1図(b)の波形図で+81 、 
+91 、 [+[++に示す。
become the level. This repetition of 'H°' and °L'' will be performed at the same high frequency as the triangular wave voltage 1 (6).The above relationship can be expressed as +81,
+91, shown in [+[++].

そして、上記コンパレータ(5)の出力でもって上記ト
ランジスタ(4)のON −OFF制御を高い周波数で
行い、その0N−OFF動作によって上記負荷ランプ(
3)にtr流′!i−流し、指定の交流電圧を供給する
Then, the ON-OFF control of the transistor (4) is performed at a high frequency using the output of the comparator (5), and the load lamp (
3) The tr style! i- Flow and supply specified AC voltage.

このように、上記曲用電源+11の各波形をトライアッ
クによる1回の位相制御でになく、上記三角波電圧1(
6)の周波数に合せて、上記トランジスタ(4)を高い
周波数でON −OFF制御させる方式によって、上記
負荷ランプ(3)からの光t IJワッブル従来装置の
1/3程度に低減することができるようになる。
In this way, each waveform of the above-mentioned music power supply +11 is not controlled once by the triac, but the above-mentioned triangular wave voltage 1 (
By controlling the transistor (4) on and off at a high frequency in accordance with the frequency of 6), the light from the load lamp (3) can be reduced to about 1/3 of that of the conventional IJ wobble device. It becomes like this.

なお、上記実施例でにトランジスタを用いた場合につい
て説明したが、トランジスタ(4)のかわりに第2図に
示すようにMOSFET yfr用いても同様の効果を
期待できる。
Incidentally, although the case where a transistor is used has been described in the above embodiment, the same effect can be expected even if a MOSFET yfr is used as shown in FIG. 2 instead of the transistor (4).

第2図にその一実施例を示す回路図であって、図におい
て、(131はMOSFETである。なお、その他同一
部分、またに相当部分には同一符号を付しである。
FIG. 2 is a circuit diagram showing one embodiment of the present invention, and in the figure, 131 is a MOSFET. Other identical or corresponding parts are given the same reference numerals.

〔発明の効果〕〔Effect of the invention〕

以上のようにこの発明によれば、負荷ランプに交流1圧
を供給する方式を、トライアックによる位相制御方式か
らトランジスタあるいはMOSFET等による商用周波
より高い周波数のPWM制御方式に震え、′lt源電圧
電圧瞬時値い部分でオンパルス幅を短かくすることによ
り、負荷ランプからの光量リップルのIaを1/3程度
に低減が図れるので、コピーの画質向上およびその高速
化、CODによる画像読み取り用として応用ができる効
果がある。
As described above, according to the present invention, the method of supplying AC 1 voltage to a load lamp is changed from a phase control method using a triac to a PWM control method using a transistor or MOSFET with a frequency higher than the commercial frequency. By shortening the on-pulse width in the portion where the instantaneous value is low, the Ia of the light intensity ripple from the load lamp can be reduced to about 1/3, so it can be applied to improve the image quality and speed of copying, and to read images by COD. There is an effect that can be done.

【図面の簡単な説明】[Brief explanation of the drawing]

第11A (a)にこの発明の一実施例を示すランプ調
光装置の回路図、第1図(b)は第1図のA 、B 、
0点における波形図、第2図にこの発明の他の実施例を
示す回路図、第3図(a) (b) i従来のランプ調
光装置の回路図および波形図である。 図において、(1)は商用電源、(2)に全波整流器、
(31ハ負荷ランプ、(411d )ランジスタ、(6
)はコンパレータ、(61に三角波′4圧11(71r
c交流全波整流電圧、+81fdA点の波形、(9)は
B点の波形、lot ld 0点の波形、(11)に抵
抗器1 、[121は直流電源、0(6)にMOSFE
Tを示す。 なお、図中、同一符号は同一または相当部分を示す。
11A (a) is a circuit diagram of a lamp dimming device showing an embodiment of the present invention, and FIG. 1(b) is a circuit diagram of A, B,
FIG. 2 is a circuit diagram showing another embodiment of the present invention, and FIGS. 3(a) and 3(b) i are a circuit diagram and waveform diagram of a conventional lamp dimming device. In the figure, (1) is a commercial power supply, (2) is a full-wave rectifier,
(31c load lamp, (411d) transistor, (6
) is a comparator, (61 is a triangular wave '4 pressure 11 (71r
c AC full-wave rectified voltage, +81 fd waveform at point A, (9) waveform at point B, lot ld waveform at point 0, resistor 1 at (11), [121 is DC power supply, MOSFE at 0 (6)]
Indicates T. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

【特許請求の範囲】[Claims] 交流電源と、ランプ負荷と、スイッチング素子とが直列
接続され、交流電源電圧検出部があり、交流電源電圧瞬
時値の大きいところではオンパルス幅が短かくなるよう
に、交流電源周波数よりも高い周波数で動作するパルス
幅制御方式のスイッチング素子の制御部を有することを
特徴とするランプ調光装置。
The AC power supply, the lamp load, and the switching element are connected in series, and there is an AC power supply voltage detection section. 1. A lamp dimming device comprising a control section of a switching element of a pulse width control type that operates.
JP62285816A 1987-11-11 1987-11-11 Dimmer for lamp Pending JPH01128395A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62285816A JPH01128395A (en) 1987-11-11 1987-11-11 Dimmer for lamp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62285816A JPH01128395A (en) 1987-11-11 1987-11-11 Dimmer for lamp

Publications (1)

Publication Number Publication Date
JPH01128395A true JPH01128395A (en) 1989-05-22

Family

ID=17696457

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62285816A Pending JPH01128395A (en) 1987-11-11 1987-11-11 Dimmer for lamp

Country Status (1)

Country Link
JP (1) JPH01128395A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008022443A1 (en) * 2006-08-21 2008-02-28 Tir Technology Lp Method and apparatus for ripple compensation of light-emitting elements
WO2011093395A1 (en) * 2010-01-29 2011-08-04 三菱化学株式会社 Light control apparatus for white led light emitting device, and lighting system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008022443A1 (en) * 2006-08-21 2008-02-28 Tir Technology Lp Method and apparatus for ripple compensation of light-emitting elements
WO2011093395A1 (en) * 2010-01-29 2011-08-04 三菱化学株式会社 Light control apparatus for white led light emitting device, and lighting system
US8508141B2 (en) 2010-01-29 2013-08-13 Mitsubishi Chemical Corporation Light control apparatus for light emitting device and illumination system

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