Variable switching frequency power converter

摘要

A drive system for an electrical load such as an electric motor or generator comprises a PWM converter and a controller therefore. A signal indicative of a condition of the converter outpost is used in a controller to drive an optimal value of PWM switching frequency based on a load characteristic that is used to control the pulse switching frequency. The system takes account of the overall system in deriving an efficient PWM switching frequency.

主权项

1. A power converter system, comprising:
an electrical load, a power converter having a variable frequency output connected to the load, the variable frequency output being generated by pulse width modulation at a switching frequency, a controller operably connected to control the output of the power converter, means for producing a signal indicative of a load current, means for deriving a value of switching frequency of the power converter based on an expression of a characteristic of the load and the signal, and means for setting the switching frequency of the power converter according to the value.