High side driver technique for miniature cold cathode fluorescen

Details High side driver technique for miniature cold cathode fluorescen High side driver technique for miniature cold cathode fluorescen

1995-01-25

1998-12-01

Pascal, Robert

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315224, 315306, 315127, 363 25, G05F 100

Patent

active

058443789

ABSTRACT:
A circuit for supplying power to a fluorescent lamp comprising a buck regulator with a high side drive. A dc battery is coupled to a drain of a first transistor. A source of the first transistor is coupled to an inverter for powering the lamp. A first control signal is coupled to a primary winding of a transformer. A first terminal of a secondary winding of the transformer is coupled to the anode of a diode. The cathode of the diode is coupled to the gate of the first transistor. A second terminal of the secondary winding of the transformer is coupled to the source of first transistor. The first control signal is activated to bias the first transistor through the transformer by charging the gate to a voltage higher than the control voltage due to the transformer turns ratio. A diode is coupled to capture a charge on the gate. A second transistor is coupled to the gate of the first transistor to drain the captured charge to ground, turning off the first transistor when a second control signal is activated. A third transistor is coupled to ground the source of the first transistor when a third control signal is activated. The lamp brightness is regulated by varying a duty cycle of the buck regulator synchronized to the inverter. The first transistor is turned on when two inverter transistors change state. After a time determined by a lamp current feedback signal, the first transistor is turned off and the third transistor is turned on. The third transistor stays on until the inverter transistors change state again, then the first transistor is turned on again.

REFERENCES:
patent: 2483815 (1949-10-01), Easton
patent: 2967267 (1961-01-01), Steinman et al.
patent: 3292579 (1966-12-01), Buchman
patent: 3549990 (1970-12-01), Hochheiser
patent: 3611021 (1971-10-01), Wallace
patent: 3758823 (1973-09-01), Jett et al.
patent: 3772625 (1973-11-01), Raupach
patent: 3778677 (1973-12-01), Kriege
patent: 3840795 (1974-10-01), Roszyk et al.
patent: 3921005 (1975-11-01), Watous
patent: 3953768 (1976-04-01), Meredith et al.
patent: 4030058 (1977-06-01), Riffe et al.
patent: 4031449 (1977-06-01), Trombly
patent: 4038625 (1977-07-01), Tompkins et al.
patent: 4063108 (1977-12-01), Klett et al.
patent: 4144462 (1979-03-01), Sieron et al.
patent: 4146857 (1979-03-01), Schleupen
patent: 4172981 (1979-10-01), Smith
patent: 4207498 (1980-06-01), Spira et al.
patent: 4210846 (1980-07-01), Capewell et al.
patent: 4251752 (1981-02-01), Stolz
patent: 4260943 (1981-04-01), Zaderej et al.
patent: 4277726 (1981-07-01), Burke
patent: 4277728 (1981-07-01), Stevens
patent: 4297614 (1981-10-01), Chandler
patent: 4303902 (1981-12-01), Lesster et al.
patent: 4318608 (1982-03-01), Payne
patent: 4414493 (1983-11-01), Henrich
patent: 4441053 (1984-04-01), Daspit
patent: 4441054 (1984-04-01), Bay
patent: 4453109 (1984-06-01), Stupp et al.
patent: 4486689 (1984-12-01), Davis et al.
patent: 4495446 (1985-01-01), Brown et al.
patent: 4496896 (1985-01-01), Melocik et al.
patent: 4498031 (1985-02-01), Stupp et al.
patent: 4523131 (1985-06-01), Zansky
patent: 4528482 (1985-07-01), Merlo
patent: 4543556 (1985-09-01), Taylor et al.
patent: 4572988 (1986-02-01), Handler et al.
patent: 4585974 (1986-04-01), Stupp et al.
patent: 4604552 (1986-08-01), Alley et al.
patent: 4612479 (1986-09-01), Zansky
patent: 4654573 (1987-03-01), Rough et al.
patent: 4686427 (1987-08-01), Burke
patent: 4698554 (1987-10-01), Stupp et al.
patent: 4700113 (1987-10-01), Stupp et al.
patent: 4704563 (1987-11-01), Hussey
patent: 4717863 (1988-01-01), Zeiler
patent: 4723098 (1988-02-01), Grubbs
patent: 4739277 (1988-04-01), Anderson
patent: 4763239 (1988-08-01), Ball
patent: 4800328 (1989-01-01), Bolger et al.
patent: 4874989 (1989-10-01), Nilssen
patent: 4893059 (1990-01-01), Nilssen
patent: 4896077 (1990-01-01), Dodd et al.
patent: 4920299 (1990-04-01), Presz et al.
patent: 4935669 (1990-06-01), Nilssen
patent: 4942352 (1990-07-01), Sano
patent: 4952849 (1990-08-01), Fellows et al.
patent: 5015919 (1991-05-01), Vila-Masot et al.
patent: 5048033 (1991-09-01), Donahue et al.
patent: 5049790 (1991-09-01), Herfurth et al.
patent: 5111118 (1992-05-01), Fellows et al.
patent: 5177408 (1993-01-01), Marques
patent: 5202608 (1993-04-01), Johnson
patent: 5214352 (1993-05-01), Love
patent: 5216402 (1993-06-01), Carosa
patent: 5237242 (1993-08-01), Takahashi et al.
patent: 5264776 (1993-11-01), Hulsey
patent: 5363020 (1994-11-01), Chen et al.
patent: 5367223 (1994-11-01), Eccher
patent: 5367224 (1994-11-01), Pacholok
patent: 5367242 (1994-11-01), Hulman
patent: 5384516 (1995-01-01), Kawabata et al.
patent: 5408162 (1995-04-01), Williams
patent: 5615093 (1997-03-01), Nalbant
Micro Linear, "Advance Information ML-4830 Electronic Ballast Contoller", Jun. 1992.
Micro Linear, "Advance Information ML-4830 Electronic Ballast Controller", Jul. 1992.
J. Williams, "Techniques for 92% Efficient LCD Illumination" Linear Technology Application Note 55, pp. AN55-1-43, Aug. 1993.
Micro Linear, "ML4874 LCD Backlight Lamp Driver," pp. 1-6, Apr. 1994.
Micro Linear, "ML4876 LCD Backlight Lamp Driver with Constrast," pp. 1-6, Apr. 1994.
U. Mader, et al., Micro Linear, "Application Note 26--Power Conversion Efficiencies for Miniature Fluorescent Lamp," pp. 1-6, Feb. 1994.
K. Kit Sum, et al., Micro Linear, "Application Note 32--Theory and Application of the ML4874 and ML4876 LCD Backlight Controller ICs," pp. 1-12, Jun. 1994.
J. J. LoCascio and U. H. Mader, "A New Control Technique Uses 25% Less Power To Drive Miniature Cold Cathode Fluorescent Lamps," Electronic Ballast, pp. 60-69, Apr. 1994.
M. Jordan and J.A. O'Connor, "Resonant Fluoresent Lamp Converter Provides Efficient and Compact Solution," IEEE, pp. 424-431, 1993 no month.
Maxim Integrated Products, "CCFT Backlight and LCD Contrast Controllers--MAX753/MAX754," pp. 1-12, Feb. 1994.
K. Kit Sum, Micro Linear, "ML4874 Evaluation Kit User's Guide--LCD Backlight Lamp Driver," pp. 1-5, Apr. 1994.
Micro Linear, "ML4864 Evaluation User's Guide--LCD Backlight Lamp Driver with Contrast Control," pp. 1-4, Jan. 1994.
Micro Linear, "ML4864 LCD Backlight Lamp Driver with Contrast," pp. 1-6, Nov. 1993.

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