JPS6155357U - - Google Patents
Info
- Publication number
- JPS6155357U JPS6155357U JP1984140998U JP14099884U JPS6155357U JP S6155357 U JPS6155357 U JP S6155357U JP 1984140998 U JP1984140998 U JP 1984140998U JP 14099884 U JP14099884 U JP 14099884U JP S6155357 U JPS6155357 U JP S6155357U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- light emitting
- output
- comparator
- oscillator
- 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.)
- Granted
Links
Description
第１図は本考案の一実施例を示す回路図、第２
図は同実施例における発振器の出力波形図である
。
１…発光ダイオード、２…電流制限抵抗、３…
トランジスタ、４…検出用抵抗、６…積分器、７
…比較器、８…基準電圧用電源、９…発振器。
Figure 1 is a circuit diagram showing one embodiment of the present invention, Figure 2 is a circuit diagram showing an embodiment of the present invention.
The figure is an output waveform diagram of the oscillator in the same embodiment. 1...Light emitting diode, 2...Current limiting resistor, 3...
Transistor, 4... Detection resistor, 6... Integrator, 7
... Comparator, 8... Reference voltage power supply, 9... Oscillator.
補正 昭５９．１２．１７
実用新案登録請求の範囲を次のように補正する
。Amendment December 17, 1982 The scope of claims for utility model registration is amended as follows.
【実用新案登録請求の範囲】
発光ダイオードの並列回路の合成電流の電源電
圧変動によつて生じた変化を検知する回路と、こ
の検知回路の出力と基準値を比較する比較器と、
この比較器の出力に応じて出力信号のデユーテイ
比が変わる発振器と、前記発光ダイオードの通電
回路に挿設され、前記発振器の出力信号によりス
イツチング動作を制御されるスイツチング素子と
を備え、電源電圧の変動に応じて回路電流を制御
し、発光ダイオードの明るさを一定に保つように
したことを特徴とする発光ダイオードの明るさ制
御回路。[Claims for Utility Model Registration] A circuit for detecting changes in the combined current of a parallel circuit of light emitting diodes caused by fluctuations in power supply voltage, a comparator for comparing the output of this detection circuit with a reference value,
It is equipped with an oscillator whose duty ratio of an output signal changes according to the output of the comparator, and a switching element that is inserted into the energizing circuit of the light emitting diode and whose switching operation is controlled by the output signal of the oscillator. A light emitting diode brightness control circuit characterized in that the circuit current is controlled according to fluctuations to keep the brightness of the light emitting diode constant.
Claims (1)
圧変動によつて生じた変化を検知する回路と、こ
の検知回路の出力と基準値を比較する比較器と、
この比較器の出力に応じて出力信号のデユーテイ
比が変わる発振器と、前記発光ダイオードの並列
回路の各枝路に挿設され、前記発振器の出力信号
によりスイツチング動作を制御されるスイツチン
グ素子とを備え、電源電圧の変動に応じて回路電
流を制御し、発光ダイオードの明るさを一定に保
つようにしたことを特徴とする発光ダイオードの
明るさ制御回路。 a circuit that detects changes in the combined current of the parallel circuit of light emitting diodes caused by fluctuations in power supply voltage; a comparator that compares the output of this detection circuit with a reference value;
The device includes an oscillator whose duty ratio of an output signal changes according to the output of the comparator, and a switching element that is inserted into each branch of the parallel circuit of the light emitting diodes and whose switching operation is controlled by the output signal of the oscillator. A light emitting diode brightness control circuit, characterized in that the circuit current is controlled according to fluctuations in the power supply voltage to keep the brightness of the light emitting diode constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1984140998U JPH0338841Y2 (en) | 1984-09-18 | 1984-09-18 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1984140998U JPH0338841Y2 (en) | 1984-09-18 | 1984-09-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6155357U true JPS6155357U (en) | 1986-04-14 |
| JPH0338841Y2 JPH0338841Y2 (en) | 1991-08-15 |
Family
ID=30699343
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1984140998U Expired JPH0338841Y2 (en) | 1984-09-18 | 1984-09-18 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0338841Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007503357A (en) * | 2003-08-27 | 2007-02-22 | オスラム・シルバニア・インコーポレイテッド | Driving circuit for LED automotive lamp |
-
1984
- 1984-09-18 JP JP1984140998U patent/JPH0338841Y2/ja not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007503357A (en) * | 2003-08-27 | 2007-02-22 | オスラム・シルバニア・インコーポレイテッド | Driving circuit for LED automotive lamp |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0338841Y2 (en) | 1991-08-15 |
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