Variable Switching Frequency Power Converter
AssigneeControl Techniques Limited
InventorColin Hargis
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Abstract
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.
Claims11
A power converter system, comprising an electrical load, a power converter having a variable frequency output connected to the load, 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 output 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.
A method of power conversion from a power converter having a variable frequency output connected to an electrical load, the method comprising producing a signal indicative of a load current, deriving a value of switching frequency of the output of the power converter based on an expression of a characteristic of the load and the signal, and setting the switching frequency of the power converter according to the value.
Dependencies are inferred from the claim text.