JPS6389268U - - Google Patents
Info
- Publication number
- JPS6389268U JPS6389268U JP1986184526U JP18452686U JPS6389268U JP S6389268 U JPS6389268 U JP S6389268U JP 1986184526 U JP1986184526 U JP 1986184526U JP 18452686 U JP18452686 U JP 18452686U JP S6389268 U JPS6389268 U JP S6389268U
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- circuit
- led light
- detects
- light source
- 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 claims 2
- 238000010586 diagram Methods 0.000 description 4
Description
第１図はこの考案の一実施例を示す回路図、第
２図は同実施例において電源電圧が変動したとき
の各部の動作タイミングを示すタイミング波形図
、第３図はこの考案の他の実施例を示す回路図、
第４図は従来例を示す回路図である。
１１……直流電源、１３１〜１３ｎ……ＬＥＤ
（発光ダイオード）、１４……定電圧ダイオード
、１５，１６……抵抗、１７……ＰＮＰ形トラン
ジスタ。
Fig. 1 is a circuit diagram showing one embodiment of this invention, Fig. 2 is a timing waveform diagram showing the operation timing of each part when the power supply voltage fluctuates in the same embodiment, and Fig. 3 is another embodiment of this invention. Schematic diagram showing an example,
FIG. 4 is a circuit diagram showing a conventional example. 11...DC power supply, 13 1 to 13 n ...LED
(light emitting diode), 14... Constant voltage diode, 15, 16... Resistor, 17... PNP type transistor.
Claims (1)
るＬＥＤ光源装置において、前記直流電源の電圧
が所定電圧以下に低下するのを検出する電圧検出
回路と、この電圧検出回路が電圧低下を検出する
と応動し、前記各ＬＥＤの少なくとも１個を短絡
する短絡回路を設けたことを特徴とするＬＥＤ光
源装置。 An LED light source device including a plurality of LEDs connected in series to a DC power source includes a voltage detection circuit that detects when the voltage of the DC power source drops below a predetermined voltage, and when the voltage detection circuit detects a voltage drop. An LED light source device characterized in that a short circuit is provided to short-circuit at least one of the LEDs in response.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986184526U JPS6389268U (en) | 1986-11-29 | 1986-11-29 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986184526U JPS6389268U (en) | 1986-11-29 | 1986-11-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6389268U true JPS6389268U (en) | 1988-06-10 |
Family
ID=31132287
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1986184526U Pending JPS6389268U (en) | 1986-11-29 | 1986-11-29 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6389268U (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 |
-
1986
- 1986-11-29 JP JP1986184526U patent/JPS6389268U/ja active Pending
Cited By (2)
| 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 |
| JP4690323B2 (en) * | 2003-08-27 | 2011-06-01 | 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 |
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