RIPPLE CORRELATION CONTROL BASED ON LIMITED SAMPLING
First Claim
11. A controller for controlling a switching electrical circuit, comprising:
- a first unit for detecting values of a first waveform perturbed by a switching operation of the electrical circuit at a beginning of and at a predetermined instant during a switching interval of the switching operation;
a second unit for detecting values of a second waveform perturbed by the switching operation of the electrical circuit at the beginning of and at the predetermined instant during the switching interval;
an evaluating unit coupled to the first and second units and operable to compute a variable to be controlled based on the corresponding values of both the first waveform and the second waveform detected at the beginning and at the predetermined instant during the switching interval; and
an operating point generator coupled to the evaluating unit and to the electrical circuit and operable to change an operating point of the electrical circuit based upon a change in the variable between the two evaluations.
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Accused Products
Abstract
A method for controlling a variable of a switching electrical circuit detects values for each of a first waveform and of a second waveform in the switching circuit at a beginning of and at a predetermined instant during a switching interval of a switching operation of the electrical circuit, both of the first and second waveforms are perturbed by the switching operation, and evaluates the variable based on the corresponding values of both the first waveform and the second waveform detected at the beginning and at the predetermined instant during the switching interval. The method further adjusts an operating point of the circuit based on a change in the variable between the two evaluations so as to maximize the variable.
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Citations
25 Claims
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11. A controller for controlling a switching electrical circuit, comprising:
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a first unit for detecting values of a first waveform perturbed by a switching operation of the electrical circuit at a beginning of and at a predetermined instant during a switching interval of the switching operation; a second unit for detecting values of a second waveform perturbed by the switching operation of the electrical circuit at the beginning of and at the predetermined instant during the switching interval; an evaluating unit coupled to the first and second units and operable to compute a variable to be controlled based on the corresponding values of both the first waveform and the second waveform detected at the beginning and at the predetermined instant during the switching interval; and an operating point generator coupled to the evaluating unit and to the electrical circuit and operable to change an operating point of the electrical circuit based upon a change in the variable between the two evaluations. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A method for controlling an input power to a switching dc-dc converter, comprising the steps of:
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(a) sensing a first ripple on an input voltage to the converter, the first ripple is produced by a switching operation of the converter, and detecting values of the input voltage at a beginning of and at a predetermined instant during a switching interval of the switching operation of the electrical circuit; (b) sensing a second ripple on an input current to the converter, the second ripple is produced by the switching operation of the converter, and detecting values of the input current at the beginning of and at the predetermined instant during the switching interval; (c) evaluating the input power based on the corresponding values of both the input voltage and the input current detected at the beginning and at the predetermined instant during the switching interval; and (d) varying a duty ratio of the switching operation based on a change in the input power so as to maximize or minimize the input power.
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19. A computer readable medium comprising instructions which when executed by a computer system causes the computer to implement a method for controlling a variable of a switching electrical circuit, comprising:
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a first unit for detecting values of a first waveform perturbed by a switching operation of the electrical circuit at a beginning of and at a predetermined instant during a switching interval of the switching operation; a second unit for detecting values of a second waveform perturbed by the switching operation of the electrical circuit at the beginning of and at the predetermined instant during the switching interval; an evaluating unit coupled to the first and second units and operable to compute the variable to be controlled based on the corresponding values of both the first waveform and the second waveform detected at the beginning and at the predetermined instant during the switching interval; and an operating point generator coupled to the evaluating unit and to the electrical circuit and operable to change an operating point of the electrical circuit based upon a change in the variable between the two evaluations.
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20. A system for performing a method for controlling a variable of a switching electrical circuit, the system comprising:
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at least one processor programmed to detect values of a first waveform perturbed by a switching operation of the electrical circuit at a beginning of and at a predetermined instant during a switching interval of the switching operation; at least one processor programmed to detect values of a second waveform perturbed by the switching operation of the electrical circuit at the beginning of and at the predetermined instant during the switching interval; at least one processor programmed to compute the variable to be controlled based on the corresponding values of both the first waveform and the second waveform detected at the beginning and at the predetermined instant during the switching interval; and at least one processor programmed to change an operating point of the electrical circuit based upon a change in the variable between the two evaluations.
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21. A method for controlling an input power to a switching dc-dc converter, comprising the steps of:
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turning the converter off for a first duration of time; sensing an open circuit voltage to the converter and determining a target voltage based on the sensed open circuit voltage; enabling a switching operation with a predetermined duty cycle and driving the input voltage of the controller to the target voltage; sensing a first ripple on the input voltage to the converter after a second duration of time, the first ripple is produced by the switching operation of the converter, and detecting values of the input voltage at a beginning of and at a predetermined instant during a switching interval of the switching operation of the electrical circuit; sensing a second ripple on an input current to the converter after the second duration of time, the second ripple is produced by the switching operation of the converter, and detecting values of the input current at the beginning of and at the predetermined instant during the switching interval; evaluating the input power based on the corresponding values of both the input voltage and the input current detected at the beginning and at the predetermined instant during the switching interval; and varying a duty ratio of the switching operation based on a change in the input power so as to minimize the change in the input power. - View Dependent Claims (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 24, 23, 25)
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24-1. The method of claim 21, wherein the first duration of time is substantially greater than the second duration of time and the second duration of time is substantially greater than the third duration of time.
Specification