AU722701B3 - Lamp array - Google Patents
Lamp array Download PDFInfo
- Publication number
- AU722701B3 AU722701B3 AU59314/99A AU5931499A AU722701B3 AU 722701 B3 AU722701 B3 AU 722701B3 AU 59314/99 A AU59314/99 A AU 59314/99A AU 5931499 A AU5931499 A AU 5931499A AU 722701 B3 AU722701 B3 AU 722701B3
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- AU
- Australia
- Prior art keywords
- light emitting
- emitting unit
- anode
- cathode
- emitting units
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Description
rIUUlUI 2.51)i Regulation 3.2(2)
AUSTRALIA
Patents Act 1990
ORIGINAL
COMPLETE SPECIFICATION PETTY PATENT Invention Title: LAMP ARRAY The following statement is a full description of this invention, including the best method of performing it known to us:- LAMP ARRAY The invention relates to a lamp array, more particularly to a lamp array having zener diodes.
Figure 1 illustrates a first conventional lamp array 10 adapted for signaling purposes. The first conventional lamp array 10 includes first, second and third light emitting units 11ii, 12, 13 connected in parallel and connected between a power source 14 and a ground terminal 15. The first light emitting unit 11 has three light emitting diodes (Dl, D4, D7) connected in series. The second light emitting unit 12 has three light emitting diodes (D2, D5, D8) connected in series. The third light emitting unit 13 has three light emitting diodes (D3, D6, D9) connected in series. Anodes of the light emitting diodes (Dl, D2, D3) are connected together to form an anode side (L0lO) that is connected to the power source 14.
Cathodes of the light emitting diodes (D7, D8, D9) are connected together to form a cathode side (LII) that is connected to the ground terminal 15. When one of the light emitting diodes (Dl, D4, D7) of the light emitting unit 11 breaks down to form an open circuit, the other light emitting diodes (Dl, D4, D7) do not light.
Therefore, the current flowing through the light emitting units 12, 13 is increased that results in increased probability of breakdown of the light emitting diodes of the light emitting units 12, 13.
Figure 2 illustrates a second conventional lamp array 20 of the aforesaid type. The second conventional lamp array 20 includes first, second and third light emitting units 21, 22, 23 connected in parallel and connected between a power source 24 and a ground terminal 25. The first light emitting unit 21 has three light emitting diodes (Dl, D2, D3) connected in parallel. The light emitting diodes (Dl, D2, D3) of the first light emitting unit 21 have anodes that are connected together to form an anode side that is connected to the power source 24. The second light emitting unit 22 has three light emitting diodes (D4, D5, D6) connected in parallel. The third light emitting unit 23 has three light emitting diodes (D7, D8, D9) connected in parallel. The light emitting diodes (D7, D8, D9) of the third light emitting unit 23 have cathodes that are connected together to form a cathode side (L21) that is connected to the ground terminal 25. When one of the light emitting diodes (Dl, D2, D3) of the first light emitting unit 21 breaks down, constant current provided by the power source 24 only flows through the other diodes (Dl, D2, D3) and will result in damage to the latter. When all of the light emitting diodes (Dl, D2, D3) break down to form an open circuit, the light emitting diodes (D4-D9) of the second and third light emitting units 22, 23 will be unable to provide light.
Therefore, the object of the present invention is to provide a lamp array in which breakdown of a light emitting diode does not result in eventual inoperability of the lamp array.
According to the present invention, a lamp array includes at least one light emitting unit adapted to be connected between a power source and a ground terminal.
The light emitting unit includes a plurality of light emitting diodes and a zener diode. The light emitting diodes have anodes that are connected together to form an anode side of the light emitting unit, and cathodes that are connected together to form a cathode side of the light emitting unit. The zener diode hds a zener cathode connected to the anode side of the light emitting unit, and a zener anode connected to the cathode side of the light emitting unit.
Other features and advantages of the present invention will become apparent in the following detailed description of the preferred embodiment with reference to the accompanying drawings, of which: Figure 1 is an electrical circuit diagram of a first conventional lamp array; Figure 2 is an electrical circuit diagram of a second conventional lamp array; and Figure 3 is an electrical circuit diagram of the preferred embodiment of a lamp array according to the present invention.
Referring to Figure 3, according to the preferred embodiment of the present invention, a lamp array is connected to a power source 34 and a ground terminal 35, and includes first, second and third light emitting units 31, 32, 33.
The first light emitting unit 31 includes three light emitting diodes (Dl, D2, D3), and a first zener diode The light emitting diodes (Dl, D2, D3) have anodes that are connected together to form a first anode side (L30), and cathodes that are connected to form a first cathode side (L31) of the first light emitting unit 31. The first zener diode (Zl) has a first zener cathode (Zl0) connected to the first anode side and a zener anode (Zll) connected to the first cathode side (L31). The first anode side (L30) of the first light emitting unit 31 is adapted to be connected to the power source 34.
The second light emitting unit 32 includes three light emitting diodes (04, D5, D6), and a second zener diode The light emitting diodes (D4, D5, D6) have anodes that are connected together to form a second anode side (L32), and cathodes that are connected to form a second cathode side (L35) of the second light emitting unit 32. The second zener diode (Z2) has a second zener cathode (Z20) connected to the second anode side (L32), and a second zener anode (Z21) connected to the second cathode side (L35) of the second light emitting unit 32. The second anode side (L32) is connected to the first cathode side (L31) of the first light emitting unit 31.
The third light emitting unit 33 includes three light emitting diodes (D7, D8, D9), and a third zener diode (Z3) The light emitting diodes (D7, D8, D9) have anodes that are connected together to form a third anode side (L33), and cathodes that are connected to form a third cathode side (L34) of the third light emitting unit 33. The third zener diode (Z3) has a third zener cathode (Z30) connected to the third anode side (L33), and a third anode (Z31) connected to the third cathode side (L34) The third anode side (L33) is connected to the second cathode side (L35) of the second light emitting unit 32. The third cathode side (L34) is adapted to be connected to the ground terminal The power source 24 is adapted to provide a constant current output. When the light emitting diodes (D1, D2, D3) of the first light emitting unit 31 are out of order, the zener diode (ZI) conducts due to the presence of a reverse bias voltage, which is larger than a breakdown voltage of the zener diode Similarly, the second and third zener diodes (Z2, Z3) conduct when the respective one of the second and third light emitting units 32,33 malfunctions. Therefore, in this invention, breakdown of the light emitting diodes of 6 the light emitting units will not affect the other light emitting units. The object of the invention is thus met.
Claims (2)
1. A lamp array adapted to be connected to a power source and a ground terminal, including: a plurality of light emitting units adapted to be connected between the power source and the ground terminal, said light emitting unit including a plurality of light emitting diodes having anodes that are connected together to form an anode side of said light emitting unit, and cathodes that are connected together to form a cathode side of said light emitting unit, and a zener diode having a zener cathode connected to said anode side of said light emitting unit, and a zener anode connected to said cathode side of said light emitting unit, and wherein said light emitting units are connected in series, said anode side of a first one of said light emitting units being adapted to be connected to the power source, said cathode side of a last one of said light emitting units being adapted to be connected to the ground terminal, said anode and cathode sides of intermediate ones of said light emitting units being connected to said cathode and anode sides of adjacent ones of said light emitting units, respectively.
2. A lamp as claimed in claim 1, substantially as hereinbefore described with reference to Figure 3 of the accompanying drawings. DATED 6" day of June, 2000 MATSUSHITA ELECTRIC (TAIWAN) CO LTD WATERMARK PATENT TRADEMARK ATTORNEYS 4TH FLOOR DURACK CENTRE 263 ADELAIDE TERRACE PERTH WA 6000
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU59314/99A AU722701B3 (en) | 1999-11-10 | 1999-11-10 | Lamp array |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU59314/99A AU722701B3 (en) | 1999-11-10 | 1999-11-10 | Lamp array |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU722701B3 true AU722701B3 (en) | 2000-08-10 |
Family
ID=3744475
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU59314/99A Ceased AU722701B3 (en) | 1999-11-10 | 1999-11-10 | Lamp array |
Country Status (1)
| Country | Link |
|---|---|
| AU (1) | AU722701B3 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3215645A1 (en) * | 1982-04-27 | 1983-10-27 | Ernst Roederstein Spezialfabrik für Kondensatoren GmbH, 8300 Landshut | Dimmer circuit |
| FR2559987A1 (en) * | 1984-02-20 | 1985-08-23 | Estival Christian | Mixed lighting feedback control device based on light-emitting diodes and on incandescent lamps. |
| US5939839A (en) * | 1997-07-07 | 1999-08-17 | Reitter & Schefenacker Gmbh & Co. Kg | Circuit for protecting electrically operated lighting elements, especially LEDs, for illumination or signaling purposes |
-
1999
- 1999-11-10 AU AU59314/99A patent/AU722701B3/en not_active Ceased
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3215645A1 (en) * | 1982-04-27 | 1983-10-27 | Ernst Roederstein Spezialfabrik für Kondensatoren GmbH, 8300 Landshut | Dimmer circuit |
| FR2559987A1 (en) * | 1984-02-20 | 1985-08-23 | Estival Christian | Mixed lighting feedback control device based on light-emitting diodes and on incandescent lamps. |
| US5939839A (en) * | 1997-07-07 | 1999-08-17 | Reitter & Schefenacker Gmbh & Co. Kg | Circuit for protecting electrically operated lighting elements, especially LEDs, for illumination or signaling purposes |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FGF | Patent sealed or granted (petty patent) |
Ref document number: 5931499 Effective date: 20000810 |
|
| NCF | Extension of term for petty patent requested (sect. 69) | ||
| NDF | Extension of term granted for petty patent (sect. 69) |