JPH0335537U - - Google Patents
Info
- Publication number
- JPH0335537U JPH0335537U JP9609189U JP9609189U JPH0335537U JP H0335537 U JPH0335537 U JP H0335537U JP 9609189 U JP9609189 U JP 9609189U JP 9609189 U JP9609189 U JP 9609189U JP H0335537 U JPH0335537 U JP H0335537U
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- led chip
- power supply
- control signal
- detector
- 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 description 1
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Light Sources And Details Of Projection-Printing Devices (AREA)
- Facsimile Scanning Arrangements (AREA)
- Fax Reproducing Arrangements (AREA)
Description
第１図はこの考案の一実施例を示す回路図、第
２図はＬＥＤチツプ上の電圧のタイムチヤートで
ある。
図において、１は電源部、２は差動増幅器、２
ａ，２ｂは抵抗、３は誤差増幅器、４は基準電圧
、５は可変抵抗素子、６はＬＥＤチツプ、７は電
圧検出端子である。
FIG. 1 is a circuit diagram showing an embodiment of this invention, and FIG. 2 is a time chart of voltage on an LED chip. In the figure, 1 is a power supply section, 2 is a differential amplifier, 2
a and 2b are resistors, 3 is an error amplifier, 4 is a reference voltage, 5 is a variable resistance element, 6 is an LED chip, and 7 is a voltage detection terminal.
Claims (1)
電圧検出器と、 入力側に基準電圧を有し、前記電圧検出器から
の出力電圧と該基準電圧との誤差分を検知して、
それに対応した制御信号を出力する誤差増幅器と
、 該制御信号に基いて電源部からの電圧を制御し
、前記ＬＥＤチツプに所定の一定電圧を供給する
電圧制御回路と を各ＬＥＤチツプ毎に設けたことを特徴とする
露光用ＬＥＤアレイの電源電圧制御装置。[Claims for Utility Model Registration] A voltage detector that detects the voltage applied to an LED chip, a reference voltage on the input side, and an error between the output voltage from the voltage detector and the reference voltage. Detect and
Each LED chip is provided with an error amplifier that outputs a corresponding control signal, and a voltage control circuit that controls the voltage from the power supply section based on the control signal and supplies a predetermined constant voltage to the LED chip. A power supply voltage control device for an exposure LED array, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9609189U JPH0335537U (en) | 1989-08-18 | 1989-08-18 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9609189U JPH0335537U (en) | 1989-08-18 | 1989-08-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0335537U true JPH0335537U (en) | 1991-04-08 |
Family
ID=31645314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9609189U Pending JPH0335537U (en) | 1989-08-18 | 1989-08-18 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0335537U (en) |
-
1989
- 1989-08-18 JP JP9609189U patent/JPH0335537U/ja active Pending
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