WO2003036405B1 - Lamp driving topology - Google Patents

Lamp driving topology

Info

Publication number
WO2003036405B1
WO2003036405B1 PCT/US2002/033966 US0233966W WO03036405B1 WO 2003036405 B1 WO2003036405 B1 WO 2003036405B1 US 0233966 W US0233966 W US 0233966W WO 03036405 B1 WO03036405 B1 WO 03036405B1
Authority
WO
WIPO (PCT)
Prior art keywords
impedance
coupled
voltage
lamp
network
Prior art date
Application number
PCT/US2002/033966
Other languages
French (fr)
Other versions
WO2003036405A1 (en
Inventor
John Chou
Arnel Dela Cruz
Original Assignee
O2Micro Inc
John Chou
Arnel Dela Cruz
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 O2Micro Inc, John Chou, Arnel Dela Cruz filed Critical O2Micro Inc
Priority to JP2003538829A priority Critical patent/JP2005507145A/en
Publication of WO2003036405A1 publication Critical patent/WO2003036405A1/en
Publication of WO2003036405B1 publication Critical patent/WO2003036405B1/en
Priority to HK05110479.4A priority patent/HK1078661A1/en

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/16—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies
    • H05B41/20—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having no starting switch
    • H05B41/23—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having no starting switch for lamps not having an auxiliary starting electrode
    • H05B41/232—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having no starting switch for lamps not having an auxiliary starting electrode for low-pressure lamps

Abstract

A lamp driving system (10) that includes a first impedance (14) and a second impedance (16) coupled to the secondary side of a transformer (12), where the second impedance has a phase shifted value compared to the first impedance. Two lamp loads (18, 20) are connected in series together, and in parallel to the first (14) and second impedances (16) and to the transformer (12). The phase shift between the impedances ensures that the transformer need not supply double the striking voltage to strike the series-connected lamps. A difference in the resistance between the first and second impedances ensures that the lamps ignite in a specified sequence.

Claims

AMENDED CLAIMS[ Received by the International Bureau on 02 May 2003 (02.05.03); claims 1, 13, 24, 25 amended, remaining claims unchanged (5 pages)]
1. A load driving system, comprising: a power source; a first impedance network coupled in series to a second impedance network, said second impedance network having a different impedance value and phase-shifted with respect to said first impedance network, said first and second impedance networks coupled in parallel to said power source; and a first load coupled in series to a second load, said first and second load coupled in parallel to said first and second impedance networks, respectively; wherein said impedance difference between said first and second impedance networks generating a selected sequence of initial voltage for said first and second loads.
2. A system as claimed in claim 1, wherein said first impedance having a larger impedance value than said second impedance.
3. A system as claimed in claim 1, said first impedance comprising a resistor and second impedance comprising a capacitor, wherein said first impedance having a larger impedance value than said second impedance.
4. A system as claimed in claim 1, said first impedance comprising a resistor and second impedance comprising an inductor, wherein said first impedance having a larger impedance value than said second impedance.
5. A system as claimed in claim 1, wherein said second impedance providing a return path for said first load to said power source.
6. A system as claimed in claim 1, wherein said first load providing a return path for said second load to said power source.
7. A system as claimed in claim 1, wherein the total voltage delivered by said power source, Vt, satisfies the equation Vt = ( x2 + y2); where x is the voltage developed across said first impedance network and y is the voltage developed across the phased impedance network.
8. A system as claimed in claim 1, wherein said first load receiving a majority of initial voltage provided by said power source, thereafter said first load receiving an operational voltage less than said initial voltage.
9. A system as claimed in claim 1, wherein said second impedance being approximately 90 degrees out of phase from said first impedance.
10. A system as claimed in claim 1, further comprising voltage feedback circuitry coupled to said first and second impedances and generating a voltage feedback signal indicative of the voltage across said first and second impedances.
11. A system as claimed in claim 1 , further comprising current feedback circuitry coupled to the said second lamp and generating a current feedback signal indicative of current delivered to said second load.
12. A system as claimed in claim 1, wherein said first and second loads each having a high side and a low side, said low sides coupled together and said high sides coupled to the power source.
13. A lamp driving system, comprising: a transformer; a first impedance network coupled in series to a second impedance network, said first impedance network having a larger impedance value than said second impedance network, said first and second impedance networks coupled in parallel to a secondary side of said transformer; and a first lamp coupled in series to a second lamp, said first and second lamps coupled in parallel to said first and second impedance networks, respectively; wherein the said larger impedance value of said first compared to second impedance networks causing said first lamp to strike before said second lamp.
14. A system as claimed in claim 13, said first impedance comprising a resistor and second impedance comprising a capacitor.
15. A system as claimed in claim 13, said first impedance comprising a resistor and second impedance comprising an inductor.
16. A system as claimed in claim 13, wherein said second impedance providing a return path for said first lamp between the top and bottom of said transformer.
17. A system as claimed in claim 13, wherein said first lamp providing a return path for said second lamp between the top and bottom of said transformer once said first lamp is struck.
18. A system as claimed in claim 13, wherein the total voltage delivered by said transformer, N , satisfies the equation N = ( x2 + y2); where x is the voltage developed across said first impedance network and y is the voltage developed across the phased impedance network.
13
19. A system as claimed in claim 13, wherein said first lamp receiving a majority of initial voltage provided by said transformer so that said first lamp is struck first with a lamp striking voltage, thereafter said first lamp receiving an operational voltage less than said striking voltage; said second lamp receiving a striking voltage after said first lamp is struck.
20. A system as claimed in claim 13, wherein said second impedance being approximately 90 degrees out of phase from said first impedance.
21. A system as claimed in claim 13, further comprising voltage feedback circuitry coupled to said first and second impedances and generating a voltage feedback signal indicative of the voltage across said first and second impedances.
22. A system as claimed in claiml3, further comprising current feedback circuitry coupled to the said second lamp and generating a current feedback signal indicative of current delivered to said second lamp.
23. A system as claimed in claim 13, wherein said first and second lamps each having a high side and a low side, said low sides coupled together and said high sides coupled to the top and bottom of said transformer.
24. A circuit, comprising a first impedance network coupled in series to a second impedance network, said second impedance network having a different impedance value and phase-shifted with respect to said first impedance network, said first and second impedance networks coupled in parallel to a power source; and a first load coupled in series to a second load, said first and second loads coupled in parallel to said first and second impedance networks; wherein said impedance difference between said first and second impedance networks generating a selected sequence of initial voltage for said first and second loads.
25. A circuit, comprising a first impedance network coupled in series to a second impedance network, said second impedance network having a different impedance value and phase-shifted with respect to said first impedance network, said first impedance network having a larger impedance value than said second impedance network, said first and second impedance networks coupled in parallel to a power source; and a first lamp coupled in series to a second lamp, said first and second lamps coupled in parallel to said first and second impedance networks, respectively; wherein said impedance difference between said first and second impedance networks causing said first lamp to strike before said second lamp.
14
26. A system as claimed in claim 1, wherein said loads selected from the group consisting of cold cathode fluorescent lamps, metal halide lamps, sodium vapor lamps, and x-ray tubes.
27. A system as claimed in claim 10, said voltage feedback circuitry comprising a first impedance coupled in series with said first impedance network generating a first component voltage feedback signal indicative of voltage appearing across said first impedance network, and a second impedance coupled in series with said second impedance network generating a second component voltage feedback signal indicative of voltage appearing across said second impedance network; said first and second component voltage feedback signals being tied together at a common node and wherein the larger of said first or second component voltage feedback signals representing said voltage feedback signal.
28. A system as claimed in claim 10, wherein said voltage feedback signal being utilized to control voltage developed by said power source.
29. A system as claimed in claim 27, wherein said first impedance having a resistance value less than the resistance value of said first impedance network; said second impedance having an impedance value larger than the resistance of said second impedance network.
30. A system as claimed in claim 13, wherein said lamps selected from the group consisting of cold cathode fluorescent lamps, metal halide lamps, sodium vapor lamps, and x-ray tubes.
31. A system as claimed in claim 21 , said voltage feedback circuitry comprising a first impedance coupled in series with said first impedance network generating a first component voltage feedback signal indicative of voltage appearing across said first impedance network, and a second impedance coupled in series with said second impedance network generating a second component voltage feedback signal indicative of voltage appearing across said second impedance network; said first and second component voltage feedback signals being tied together at a common node and wherein the larger of said first or second component voltage feedback signals representing said voltage feedback signal.
32. A system as claimed in claim 21, wherein said voltage feedback signal being utilized to control voltage developed by said transformer.
15
33. A system as claimed in claim 31 , wherein said first impedance having a resistance value less than the resistance value of said first impedance network; said second impedance having a resistance value larger than the resistance of said second impedance network.
34. A system as claimed in claim 1, wherein said power source comprises a transformer.
16
PCT/US2002/033966 2001-10-23 2002-10-23 Lamp driving topology WO2003036405A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2003538829A JP2005507145A (en) 2001-10-23 2002-10-23 Load drive system
HK05110479.4A HK1078661A1 (en) 2001-10-23 2005-11-21 Lamp driving topology

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/035,973 2001-10-23
US10/035,973 US6559606B1 (en) 2001-10-23 2001-10-23 Lamp driving topology

Publications (2)

Publication Number Publication Date
WO2003036405A1 WO2003036405A1 (en) 2003-05-01
WO2003036405B1 true WO2003036405B1 (en) 2003-08-07

Family

ID=21885855

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2002/033966 WO2003036405A1 (en) 2001-10-23 2002-10-23 Lamp driving topology

Country Status (6)

Country Link
US (1) US6559606B1 (en)
JP (1) JP2005507145A (en)
CN (1) CN100432882C (en)
HK (1) HK1078661A1 (en)
TW (1) TW595262B (en)
WO (1) WO2003036405A1 (en)

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Also Published As

Publication number Publication date
CN100432882C (en) 2008-11-12
HK1078661A1 (en) 2006-03-17
JP2005507145A (en) 2005-03-10
TW595262B (en) 2004-06-21
US6559606B1 (en) 2003-05-06
US20030076052A1 (en) 2003-04-24
CN1672108A (en) 2005-09-21
WO2003036405A1 (en) 2003-05-01

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