Dead-time compensation with narrow pulse elimination in solid- state switch devices
AssigneeBallard Power Systems Inc.
InventorsDoug D. Deng, Kon-King M. Wang, Steven J. Kowalec
Life of this patent
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Abstract
The present invention relates to a system and method for compensating the voltage distortion and minimizing the available voltage range loss both caused by switching dead-time of solid-state switch components in power conversion devices. As a result, the power quality supplied from the power conversion devices can be improved and the output voltage of such devices can be increased.
Claims20
An apparatus for controlling a solid-state switch device comprising:
- means for providing a predetermined time delay;
- means for receiving and filtering a feedback of current that the solid-state switch device outputs;
- means for detecting a polarity change in the feedback current;
- and
- means for receiving a pulse width modulated (PWM) signal and for generating control signals to control a plurality of solid-state switches in the solid-state switch device based on the detected polarity change in the filtered feedback current, and a delay of the PWM signal as caused by the means for providing the predetermined time delay.
A method for compensating dead-time non-linearity in a solid-state switch device comprising:
- receiving a pulse width modulated (PWM) signal at a first time point;
- receiving a current fed back from an output of the solid-state switch device, wherein the solid-state switch device comprises a plurality of switch components;
- detecting a polarity change in the feedback current at a second time point;
- detecting a rising edge of the PWM signal at a third time point;
- determining whether the feedback current has a positive or negative polarity subsequent to the detected polarity change;
- and
- if the feedback current has a positive polarity subsequent to the detected polarity change, outputting a first control signal to activate a first switch component of the solid-state switch device a predetermined time delay after the third time point.
A method for compensating dead-time non-linearity in a solid switch device comprising:
- receiving a pulse width modulated (PWM) signal at a first time point;
- receiving a current fed back from an output of the solid-state switch device, wherein the solid-state switch device comprises a plurality of switch components;
- detecting a polarity change in the feedback current at a second time point;
- detecting a falling edge of the PWM signal at a third time point;
- determining whether the feedback current has a positive or negative polarity subsequent to the detected polarity change;
- and
- if the feedback current has a negative polarity subsequent to the detected polarity change, outputting a first control signal to de-activate a first switch component of the solid-state switch device a predetermined time delay after the third time point.
A power conversion device comprising:
- an upper switch connected between a positive terminal of a DC source and a load;
- a lower switch connected between a negative terminal of the DC source and the load;
- a switching control module having a dead-time compensator including a first output coupled to a control of the upper switch and a second output coupled to a control of the lower switch;
- and
- a zero crossing detector having an input coupled to the load, and an output coupled to an input of the dead-time compensator.
Dependencies are inferred from the claim text.