Motor drive with resonance detection and impedance computation
First Claim
Patent Images
1. A power conversion system, comprising:
- an AC input coupleable to receive AC input power from a power source;
a rectifier, including a plurality of AC input terminals, first and second DC output terminals, and a plurality of switching devices individually coupled between a corresponding one of the AC input terminals and one of the first and second DC output terminals;
a filter circuit coupled between the AC input and the rectifier; and
a controller to provide switching control signals to operate the switching devices of the rectifier, the controller operative in a first mode to;
turn a single one of the switching devices on for a non-zero time period,turn the single one of the switching devices off after the non-zero time period,measure a voltage or current signal associated with the filter circuit while all of the switching devices are off after the non-zero time period,determine a resonant frequency based on a transient response of the measured voltage or current signal, andselectively adjust a rectifier control parameter to mitigate filter resonance based on the resonant frequency.
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Abstract
Disclosed examples include power conversion systems, computer readable mediums and methods for mitigating input filter resonance, in which a controller operates an active front end (AFE) rectifier in a first mode to turn a single rectifier switching device on and off and measures a filter voltage or current signal while all of the rectifier switches are off. The controller determines a resonant frequency based on a transient response of the measured voltage or current signal, and selectively adjusts a rectifier control parameter to mitigate filter resonance based on the resonant frequency.
12 Citations
20 Claims
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1. A power conversion system, comprising:
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an AC input coupleable to receive AC input power from a power source; a rectifier, including a plurality of AC input terminals, first and second DC output terminals, and a plurality of switching devices individually coupled between a corresponding one of the AC input terminals and one of the first and second DC output terminals; a filter circuit coupled between the AC input and the rectifier; and a controller to provide switching control signals to operate the switching devices of the rectifier, the controller operative in a first mode to; turn a single one of the switching devices on for a non-zero time period, turn the single one of the switching devices off after the non-zero time period, measure a voltage or current signal associated with the filter circuit while all of the switching devices are off after the non-zero time period, determine a resonant frequency based on a transient response of the measured voltage or current signal, and selectively adjust a rectifier control parameter to mitigate filter resonance based on the resonant frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method to mitigate resonance in a filter of a power conversion system, the method comprising, in a first operating mode:
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turning a single one of a plurality of rectifier switching devices on for a non-zero time period; turning the single one of the rectifier switching devices off after the non-zero time period; measuring a voltage or current signal associated with the filter circuit while all of the plurality of switching devices are off after the non-zero time period, determining a resonant frequency based on a transient response of the measured voltage or current signal; and selectively adjusting a rectifier control parameter to mitigate filter resonance based on the resonant frequency. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A non-transitory computer readable medium with computer executable instructions for mitigating resonance in a filter of a power conversion system, the computer readable medium comprising computer executable instructions for, in a first operating mode:
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turning a single one of a plurality of rectifier switching devices on for a non-zero time period; turning the single one of the rectifier switching devices off after the non-zero time period; measuring a voltage or current signal associated with the filter circuit while all of the plurality of switching devices are off after the non-zero time period, determining a resonant frequency based on a transient response of the measured voltage or current signal; and selectively adjusting a rectifier control parameter to mitigate filter resonance based on the resonant frequency. - View Dependent Claims (19, 20)
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Specification