Motor voltage reconstruction by ADC oversampling and averaging
AssigneeNXP USA, Inc.
InventorsJozef Janosik, Marek Musak, Tomas Fedor
Life of this patent
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Abstract
A method for motor voltage reconstruction by Analog to Digital Converter (ADC) oversampling and averaging includes measuring a first phase voltage with an ADC, the first phase voltage proportional to a first duty cycle of a first Pulse Width Modulation (PWM) signal. A second phase voltage is measured with the ADC, the second phase voltage proportional to a second duty cycle of a second PWM signal, wherein the first PWM signal and the second PWM signal control consecutive phases of a three-phase motor. A third duty cycle of a third PWM signal of the three-phase motor is reconstructing from the first phase voltage and the second phase voltage.
Claims20
A method for motor voltage reconstruction by Analog to Digital Converter (ADC) oversampling and averaging comprising:
- measuring a first phase voltage with an ADC, the first phase voltage proportional to a first duty cycle of a first Pulse Width Modulation (PWM) signal;
- measuring a second phase voltage with the ADC, the second phase voltage proportional to a second duty cycle of a second PWM signal, wherein the first PWM signal and the second PWM signal control consecutive phases of a three-phase motor;
- and
- reconstructing from the first phase voltage and the second phase voltage, a third duty cycle of a third PWM signal of the three-phase motor.
A method for motor voltage reconstruction by Analog to Digital Converter (ADC) oversampling and averaging comprising:
- measuring a first phase voltage with an ADC, the first phase voltage proportional to a first duty cycle of a first Pulse Width Modulation (PWM) signal;
- measuring a second phase voltage with the ADC, the second phase voltage proportional to a second duty cycle of a second PWM signal, wherein the first PWM signal and the second PWM signal control consecutive phases of a three-phase motor;
- and
- performing a plausibility check by comparing each of a reconstructed alpha voltage and reconstructed beta voltage to a corresponding required alpha voltage and a required beta voltage, wherein the reconstructed alpha voltage and the reconstructed beta voltage are derived from the first phase voltage and the second phase voltage.
A method for motor voltage reconstruction by Analog to Digital Converter (ADC) oversampling and averaging comprising:
- measuring a first phase voltage proportional to a first duty cycle by averaging a plurality of first phase voltage samples of a first Pulse Width Modulation (PWM) signal,
- measuring a second phase voltage proportional to a second duty cycle by averaging a plurality of second phase voltage samples of a second PWM signal, wherein the first PWM signal and the second PWM signal control consecutive phases of an inverter;
- reconstructing from the first phase voltage and the second phase voltage, a third duty cycle of a third PWM signal of the inverter;
- and
- performing a plausibility check by comparing each of a reconstructed alpha voltage and a reconstructed beta voltage to a corresponding required alpha voltage and a required beta voltage, wherein the reconstructed alpha voltage and the reconstructed beta voltage are derived from the first phase voltage and the second phase voltage.
Dependencies are inferred from the claim text.