Dynamic frequency compensation of switching power converters

摘要

A kilowatt-scale high-frequency electrical power conversion system adapted for variable output power delivery is described, in which switching frequency of switchable power delivery circuitry is dynamically modulated in transition of the system to a low power regime that is substantially below maximum power output, in order to at least partially attenuate thermal overload from heat generation of switching components in such transitions. The system is useful in high-efficiency charging of rechargeable batteries of electrical vehicles, e.g., e.g., automotive, industrial, and other motive power vehicles.

主权项

1. A kilowatt-scale high-frequency electrical power conversion system adapted for variable output power delivery, said system comprising:
switchable power delivery circuitry generating thermal overload at power output level in a low power regime that is substantially below maximum power output of said switchable power delivery circuitry, wherein switching components of said switchable power delivery circuitry in said low power regime generate substantially higher heat than is generated by them in operation at power output level outside of said low power regime; and frequency control circuitry adapted to dynamically reduce switching frequency of said switchable power delivery circuitry during transition from variable output power delivery operation outside of the low power regime to operation in said low power regime and to maintain switching frequency of said switchable power delivery circuit in said low power regime at sufficiently low level to at least partially reduce said substantially higher heat that would occur in the absence of the frequency control circuitry.