Reducing Line/ Load Regulation Problems In Switching Regulators
AssigneeTexas Instruments Incorporated
InventorAnmol SHARMA
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Abstract
A switching regulator provided according to an aspect of the present invention contains uses one or more error samples from prior iterations, in addition to an error sample of the present iteration, to determine the correction for the present iteration. Due to the use of multiple samples, a switching regulator may provide a regulated signal which is at least substantially constant even in the presence of line/load variations. A controller determining the correction can be implemented either in analog or digital domain.
Claims16
A switching regulator providing a constant output signal to an external circuit offering a load, said switching regulator comprising:
- a first circuit containing a plurality of switches and receiving an input signal which is potentially unregulated, wherein said plurality of switches can be turned on and off with a duty cycle based on a control parameter, said first circuit providing said input signal as an intermediate signal at time durations specified by said duty cycle;
- an impedance network providing an output signal by averaging the signal strength of said intermediate signal;
- a comparator comparing the strength of said output signal with a first signal to generate an error value in each of a plurality of successive iterations, said first signal being proportionate to a desired strength of said constant output signal;
- and
- a controller controlling said control parameter in each iteration based on a plurality of error values generated by said comparator, said control parameter being controlled to cause said impedance network to generate said constant output signal.
A method of generating a constant regulated output, said method comprising:
- generating an output signal based on an unregulated signal, wherein a strength of said output signal is controlled by switching on or off a plurality of switches;
- comparing a present output sample with a desired strength to generate an error value in each of a plurality of successive iterations;
- determining a control parameter based on a plurality of error values generated by said comparing;
- and
- turning said plurality of switches according to a value of said control parameter,
- wherein said control parameter is generated accurately due to the use of said plurality of error values.
A system comprising:
- a plurality of components requiring a constant output signal of desired strength;
- a switch mode regulator providing said constant output signal, said switch mode regulator comprising:
- a first circuit containing a plurality of switches and receiving an input signal which is potentially unregulated, wherein said plurality of switches can be turned on and off based on a control parameter, said first circuit providing said input signal as an intermediate signal at time durations specified by said duty cycle;
- an impedance network providing an output signal by averaging the signal strength of said intermediate signal;
- a comparator comparing the strength of said output signal with a first signal to generate an error value in each of a plurality of successive iterations, said first signal being proportionate to a desired strength of said constant output signal;
- a controller controlling said control parameter in each iteration based on a plurality of error values generated by said comparator, said control parameter being controlled to cause said impedance network to generate said constant output signal.
Dependencies are inferred from the claim text.