SWITCHED MODE POWER SUPPLY OUTPUT FILTER CONFIGURATION

摘要

There is provided a method of determining a configuration of capacitors in an output filter (120) of a switched mode power supply, SMPS (100). The method comprises generating candidate configurations of capacitors defining respective arrangements of capacitors of different kinds in the output filter (120), 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. The method further comprises 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. Whether or not 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.