Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing
Patent
1996-12-11
1998-09-22
Wambach, Margaret Rose
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synchronizing
327158, 327243, 327244, H03L 706
Patent
active
058119990
ABSTRACT:
A circuit for synchronizing a periodic ramp signal utilized in a switching mode power converter to system clock signal. A capacitor is charged through a resistor. When a voltage across the capacitor reaches a predetermined level, the capacitor is discharged and the charging cycle is repeated, thereby generating the periodic ramp signal across the capacitor. A waveform shaping circuit shapes the ramp signal into a rectangular wave signal having a same frequency and phase as the ramp signal. A phase comparator compares a phase of the rectangular wave signal to a phase of the system clock signal for forming a phase error signal. The phase error signal controls a level of current supplied to the timing capacitor by a voltage controlled current source. When the frequency of the system clock signal is higher than the frequency of the ramp signal, the phase comparator causes the voltage controlled current source to supply additional current to the capacitor, increasing the frequency of the ramp signal. When the frequency of the system clock signal is lower than the frequency of the ramp signal, the phase comparator causes the voltage controlled current to supply less current to the capacitor, decreasing the frequency of the ramp signal. Therefore, the frequency of the ramp signal is controlled in phase locked loop to synchronize the ramp signal with the system clock signal. The synchronized ramp signal can then be utilized for controlling switching in the switching mode power converter, reducing the effects of switching noise.
REFERENCES:
patent: 3294981 (1966-12-01), Bose
patent: 3603809 (1971-09-01), Uchiyama
patent: 3660753 (1972-05-01), Judd et al.
patent: 3883756 (1975-05-01), Dragon
patent: 4311954 (1982-01-01), Capel
patent: 4392103 (1983-07-01), O'Sullivan et al.
patent: 4407588 (1983-10-01), Arichi et al.
patent: 4437146 (1984-03-01), Carpenter
patent: 4456872 (1984-06-01), Froeschle
patent: 4529927 (1985-07-01), O'Sullivan et al.
patent: 4651231 (1987-03-01), Douglas, Jr.
patent: 4672518 (1987-06-01), Murdock
patent: 4674020 (1987-06-01), Hill
patent: 4677366 (1987-06-01), Wilkinson et al.
patent: 4691159 (1987-09-01), Ahrens et al.
patent: 4731574 (1988-03-01), Melbert
patent: 4736151 (1988-04-01), Dishner
patent: 4761725 (1988-08-01), Henze
patent: 4837495 (1989-06-01), Zansky
patent: 4841220 (1989-06-01), Tabisz et al.
patent: 4920309 (1990-04-01), Szepesi
patent: 4929882 (1990-05-01), Szepesi
patent: 4941080 (1990-07-01), Sieborger
patent: 4975823 (1990-12-01), Rilly et al.
patent: 5028861 (1991-07-01), Pace et al.
patent: 5034873 (1991-07-01), Feldtkeller
patent: 5146399 (1992-09-01), Gucyski
patent: 5223931 (1993-06-01), Fernsler et al.
patent: 5278490 (1994-01-01), Smedley
patent: 5359281 (1994-10-01), Barrow et al.
patent: 5412308 (1995-05-01), Brown
patent: 5434767 (1995-07-01), Batarseh et al.
patent: 5440473 (1995-08-01), Ishii et al.
patent: 5457621 (1995-10-01), Munday et al.
patent: 5457622 (1995-10-01), Arakawa
patent: 5461302 (1995-10-01), Garcia et al.
patent: 5477132 (1995-12-01), Canter et al.
patent: 5485361 (1996-01-01), Sokal
patent: 5491445 (1996-02-01), Moller et al.
patent: 5502370 (1996-03-01), Hall et al.
patent: 5565761 (1996-10-01), Hwang
patent: 5568041 (1996-10-01), Hesterman
patent: 5592128 (1997-01-01), Hwang
patent: 5619276 (1997-04-01), Christopher et al.
"Nonlinear-Carrier Control for High Power Factor Rectifiers Based On Flyback, Cuk, or Sepic Converters," R. Zane and D. Maksimovic, Applied Power Electronics Conf., pp. 814-820, 1996.
"Nonlinear-Carrier Control for High Power Factor Boost Rectifiers," D. Maksimovic, Y. Jang, R. Erikson, Applied Power Electronics Conf., pp. 635-641, 1995.
"ML4863 High Efficiency Flyback Controller", Micro Linear Corporation, Feb. 1995.
"ML4863EVAL User's Guide High Efficiency Flyback Controller", Micro Linear Corporation, Feb. 1995.
"Off-Line And One-Cell IC Converters Up Efficiency", Frank Goodenough, Electronic Design, pp. 55-56, 58, 60, 62-64, Jun. 27, 1994.
"Designing with hysteretic current-mode control", Gedaly Levin and Kieran O'Malley, Cherry Semi-Conductor Corp., EDN, pp. 95-96, 98, 100-102, Apr. 28, 1994.
"Analysis of the Flyback Converter Operating in Current-Mode Pulse-Frequency Modulation", Urs Mader and K. Kit Sum, Micro Linear Corporation, Apr. 17, 1994.
"Step-Up/Step Down Converters Power Small Portable Systems", Bruce D. Moore, EDN, pp. 79-84, Feb. 3, 1994.
"ML4861 Low Voltage Boost Regulator", Micro Linear Corporation, Jun. 1993.
"11. Variable Frequency Converters", K. Kit Sum, pp. 96-97, 134-135, 1993.
"3.3V/5V/Adjustable Output, Step-Up, DC-DC Converters", Maxim Integrated Products, pp. 1-8, 1993.
"ML4821 Power Factor Controller," Micro Linear Corporation, Jun. 1992.
"Application Note 16--Theory and Application of the ML4821 Average Current Mode PFC Controller," Micro Linear Corporation, Jan. 1992.
"Small-Signal High-Frequency Analysis Of The Free-Running Current-Mode-Controlled Converter", Richard Redl, pp. 897-906, IEEE, 1991.
"Low-Voltage-Input, 3V/3.3V/5V/Adjustable-Output, Step-Up DC-DC Converters", Maxim Integrated Products, pp. 4-189 to 4-191 (no date).
"LT1073 Micropower DC-DC Converter Adjustable and Fixed 5V, 12V", Linear Technology, pp. 4-174 to 4-189, 4-192, (no date).
"ML4823 High Frequency Power Supply Controller," Micro Linear Corporation, Dec. 1994.
"ML4863 High Efficiency Battery Pack Converter (Preliminary)", Micro Linear Corporation, Jun. 1994.
"ML 4880 Portable PC/PCMCIA Power Controller (Preliminary)", Mirco Linear Corporation, Oct. 1995.
Hall George Arthur
Smith Richard Allen
Micro Linear Corporation
Wambach Margaret Rose
LandOfFree
Power converter having switching frequency phase locked to syste does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Power converter having switching frequency phase locked to syste, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Power converter having switching frequency phase locked to syste will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1625874