SWITCHED MODE POWER SUPPLY OUTPUT FILTER CONFIGURATION
First Claim
1. A method of determining a configuration of capacitors in an output filter of a switched mode power supply, SMPS, the method comprising:
- generating candidate configurations of capacitors defining respective arrangements of capacitors of different kinds in the output filter, each candidate configuration being associated with a respective value of a cost function that is calculated based on a number of capacitors of each kind in the candidate configuration and a cost assigned to each kind of capacitor, the candidate configurations being ordered in order of increasing or decreasing values of the cost function; and
performing a binary search on the ordered candidate configurations of capacitors to determine a capacitor configuration associated with a lowest value of the cost function from among candidate configurations of capacitors that are determined during the binary search to allow a load transient response requirement of the SMPS to be fulfilled,wherein whether a candidate configuration allows the load transient response requirement of the SMPS to be fulfilled is determined using a model of a SMPS having the candidate configuration of the output filter to simulate a deviation of an output voltage of the SMPS in response to a change in a load current of the SMPS, and determining whether the load transient response requirement is fulfilled based on the simulated deviation of the output voltage.
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Abstract
Method determines a configuration of capacitors in an output filter of a switched mode power supply (SMPS). Candidate configurations are generated, each associated with a respective cost function value calculated based on number of capacitors of each kind in the candidate configuration and cost assigned to each kind of capacitor. The candidate configurations are ordered based on their cost function values. A binary search through the ordered candidate configurations determines a capacitor configuration associated with a lowest cost function value to allow a defined load transient response requirement of the SMPS. Whether a candidate configuration allows the defined load transient response requirement of the SMPS is determined using a model of a SMPS having the candidate configuration of the output filter simulating deviation of output voltage of the SMPS in response to change in load current of the SMPS and determining whether the defined load transient response requirement is allowed.
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Citations
44 Claims
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1. A method of determining a configuration of capacitors in an output filter of a switched mode power supply, SMPS, the method comprising:
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generating candidate configurations of capacitors defining respective arrangements of capacitors of different kinds in the output filter, each candidate configuration being associated with a respective value of a cost function that is calculated based on a number of capacitors of each kind in the candidate configuration and a cost assigned to each kind of capacitor, the candidate configurations being ordered in order of increasing or decreasing values of the cost function; and performing a binary search on the ordered candidate configurations of capacitors to determine a capacitor configuration associated with a lowest value of the cost function from among candidate configurations of capacitors that are determined during the binary search to allow a load transient response requirement of the SMPS to be fulfilled, wherein whether a candidate configuration allows the load transient response requirement of the SMPS to be fulfilled is determined using a model of a SMPS having the candidate configuration of the output filter to simulate a deviation of an output voltage of the SMPS in response to a change in a load current of the SMPS, and determining whether the load transient response requirement is fulfilled based on the simulated deviation of the output voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. An apparatus for determining a configuration of capacitors in an output filter of a switched mode power supply, SMPS, the apparatus comprising:
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a candidate configuration generator module arranged to generate candidate configurations of capacitors defining respective arrangements of capacitors of different kinds in the output filter, the candidate configuration generator module comprising; a cost calculation module arranged to evaluate, for each candidate configuration, a cost function based on a number of capacitors of each kind in the candidate configuration and a cost assigned to each kind of capacitor; and an association module arranged to associate each candidate configuration with a respective value of the cost function calculated by the cost calculation module, wherein the candidate configuration generator module is arranged to order the candidate configurations in order of increasing or decreasing values of the cost function; and a search module arranged to perform a binary search on the ordered candidate configurations of capacitors to determine a capacitor configuration associated with a lowest value of the cost function from among candidate configurations of capacitors that are determined during the binary search to allow a load transient response requirement of the SMPS to be fulfilled, the search module comprising; an output voltage deviation determining module arranged to simulate a deviation of an output voltage of the SMPS in response to a change in a load current of the SMPS, using a model of a SMPS having a candidate configuration of the output filter; and an evaluation module arranged to determine whether the candidate configuration of capacitors allows the load transient response requirement to be fulfilled based on the simulated deviation of the output voltage. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
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Specification