Reflected input ripple current in a distributed powering system

The input ripple current for single and multiconverter systems is described, and a series of general equations which can accurately predict ripple for virtually all topologies is developed. It is determined that the input ripple current of a converter may vary in different systems due to the variations in the feeder impedances. The magnitude and frequency content of the total ripple current for a multiconverter system are expressed in terms of the input filter impedances of all the converters operating in the system. It is also demonstrated that in the multiconverter systems the parallel combination of the distributed input filter impedances of all converters appears across the input terminals of each converter. The total input ripple current of a typical multiconverter system is less than the ripple of the same convertors operating in a single-converter configuration. In addition, the total input ripple current for a multiconverter system is not a modulated signal but only contains the switching frequencies of the converters and their harmonics