Control device for power converter
AssigneeKabushiki Kaisha Toshiba
InventorKazuto Kawakami
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Abstract
The IGBT drive signal to a power converter comprising power semiconductor elements, such as IGBT, is supplied by a PWM controller which performs pulse width modulation of voltage references. A DC offset voltage Vd is generated by a DC offset generator in accordance with the output frequency f and output phase θ, and this voltage Vd and the voltage references are added together by adders 22-24, and supplied to the PWM controller to form IGBT drive signals. Thereby, it is possible to reduce the amount of loss generated by the power semiconductor elements used in the control device of a power converter for converting DC voltage to AC voltage, or AC voltage to DC voltage.
Claims7
A control device for a power converter comprising:
- a power converter consisting of power semiconductor elements for converting DC voltage to AC voltage, or AC voltage to DC voltage, by means of pulse width modulation;
- a control device for controlling said power converter;
- and
- an offset voltage section for adding a DC offset voltage to AC voltage references input to said control device, when a frequency of said AC voltage references is at or below a prescribed value.
Dependencies are inferred from the claim text.