Method of reducing input current distortion in a rectifier
AssigneeHamilton Sundstrand Corporation
InventorVietson M. Nguyen
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Abstract
A method is disclosed for reducing input current harmonic distortion in a Vienna-type active rectifier that includes the steps of sensing voltage values from upper and lower halves of a DC bus associated with the rectifier, determining an average of the sensed voltage values, calculating upper and lower scale factors by dividing the sensed voltage values with the averaged sensed voltage value, rescaling a reference signal from a controller using the upper and lower calculated scale factors, and forward feeding the rescaled reference signal from the controller to a pulse width modulator to obtain a gate driver signal for power semiconductor switches of the rectifier.
Claims12
A method of reducing distortion in a rectifier comprising the steps of:
- a) sensing voltage values;
- b) calculating scale factors for the sensed voltage values;
- c) rescaling reference signals for a pulse width modulator based on the scale factors to obtain gate driver signals for the rectifier.
A method of reducing input current harmonic distortion in a Vienna-type active rectifier, comprising the steps of:
- a) sensing voltage values from two halves of a DC bus associated with the rectifier;
- b) averaging the two sensed voltage values;
- c) calculating scale factors for the sensed voltage values;
- d) rescaling a reference signal from a controller using the calculated scale factors;
- and
- e) forward feeding the rescaled reference signal to a pulse width modulator to obtain a gate driver signal for a phase of the rectifier.
A method of reducing input current harmonic distortion in a Vienna-type active rectifier having power semiconductor switches, comprising the steps of:
- a) sensing voltage values from upper and lower halves of a DC bus associated with the rectifier;
- b) determining an average of the sensed voltage values;
- c) calculating upper and lower scale factors by dividing the sensed voltage values with the averaged sensed voltage value;
- d) rescaling a reference signal from a controller using the upper and lower calculated scale factors to minimize effects of third harmonic voltage ripples on the upper and lower halves of the DC bus;
- and
- e) forward feeding the rescaled reference signal from the controller to a pulse width modulator to obtain a gate driver signal for power semiconductor switches of the rectifier.
Dependencies are inferred from the claim text.