Method and System for Voltage Tracking and Sequencing in a Power Supply
a power supply and voltage tracking technology, applied in the field of power supplies, can solve the problems of inability to achieve the desired voltage level, method disadvantage, and high cost of approach, and achieve the effect of virtually no power consumption
Inactive Publication Date: 2007-01-04
CISCO TECH INC
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Benefits of technology
The patent describes a method for controlling multiple voltages in a power supply using multiple DC to DC power converters. The method includes detecting when the voltage supply reaches a certain level and providing a control signal to each power converter to generate the desired voltage level over time. The technical effect of this invention is that it allows for voltage tracking and sequencing while still allowing for voltage margining, and can use relatively inexpensive devices and wasting minimal power.
Problems solved by technology
It is known that in such a power supply problems arise if the voltage levels generated by each of the power converters rise to their full level, or drop to zero upon termination, such that particular differential voltage levels between any two of the power rails reach undesired levels.
Each of these methods has disadvantages.
This approach can be expensive, reduce reliability, generate heat, and consume board real estate.
This approach has a problem of possible overloading of the lower voltage supply, causing undue stress.
The diodes are physically large and costly.
This solution is suitable for voltage sequencing, but not useful for voltage tracking.
This feature does not accommodate voltage margining.
Method used
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Embodiment Construction
[0022] Embodiments of the invention are best understood by referring to FIGS. 1 through 6 of the drawings, like numerals being used for like and corresponding parts of the various drawings.
[0023]FIG. 1 is a block diagram illustrating portions of a power supply 10 according to the teachings of the invention. Power supply 10 includes a plurality of power converters 12, 14, 16, 18, and 20. In this example, five power converters are utilized and the characteristics of the power converters are as follows: Power converter 12 converts 12 volts DC to 1.8 volts DC. Power controller 14 converts 12 volts DC to 2.5 volts DC. Power controller 16 converts 12 volts DC to 3.3 volts DC. Power controller 18 converts 12 volts DC to 1.35 volts DC. Power controller 20 converts 12 volts DC to 1.5 volts DC. However, the teachings of the invention are applicable to any suitable number of converters as well as any levels of power conversion.
[0024] Each power converter receives as input twelve volts at a r...
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A method for controlling multiple voltages in a power supply includes providing a plurality of DC to DC power converters. Each power converter includes a pulse width modulator controller having a control pin. The method also includes when a voltage supply to the power controllers reads a particular level. After the particular level is met, the method includes providing a respective rising ramp control signal to each respective control pin of the pulse width modulator controller such that each respective power converter generates desired voltage level over time characteristics.
Description
CROSS-REFERENCE TO RELATED APPLICATION [0001] This application is a continuation of U.S. applicaton Ser. No. 10 / 443,911 filed May 21, 2003 and entitled “Method and System for Voltage Tracking and Sequencing in a Power Supply”.TECHNICAL FIELD OF THE INVENTION [0002] This invention relates generally to power supplies and more particularly to a method and system for voltage tracking and sequencing in a power supply. BACKGROUND OF THE INVENTION [0003] Power supplies are required in most every electronic device used today. An example use of a power supply is in an Ethernet switch. Such power supplies often require multiple different power levels for various portions of the Ethernet switch. A given power level is sometimes referred to as a power rail. Such power supplies often receive one voltage level as an input, such as 12 volts and generate numerous different power levels through a plurality of power converters. [0004] It is known that in such a power supply problems arise if the volt...
Claims
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IPC IPC(8): H02J1/10
CPCH02M1/36H02J1/102
Inventor MARSHALL, ROBERT A.SALINAS, CARLOS A.
Owner CISCO TECH INC