PATENT CLAIM ANALYSIS

Application Number: 16083853
Application Type: Utility
Filing Date: 2018-09
Publication Date: 2019-02
Patent Classification: ["318", "400200"]

Abstract:
The present invention relates to a motor driving device and a method for measuring a phase current in a motor driving device, and specifically relates to a technique of measuring three phase currents of a three-phase brushless motor using a current sensor for measuring the DC bus current in the inverter. The control unit according to the present invention shifts a pulse phase of a PWM pulse such that pulse phases of the three phase PWM pulses in a first PWM cycle of the PWM control differ from those in a second PWM cycle of the PWM control, and measures the three phase currents from the output of the current sensor in these two first and second PWM cycles. The control unit calculates an offset error of the current sensor from these three phase current measurements and learns a correction value used for performing offset correction on the electric-current measurement.

Claim (Index 6):
A method for measuring a phase current in a motor driving device including an inverter for supplying an AC power to a three-phase brushless motor, and a current sensor for measuring a DC bus current in the inverter, the inverter being controlled by PWM control, the method comprising:\n a first step of performing pulse shifting to shift a pulse phase of a PWM pulse in a first PWM cycle of the PWM control to generate one or two phase current measurement periods for measuring one or two phase currents in the first PWM cycle; a second step of measuring the one or two phase currents from an output of the current sensor in the one or two phase current measurement periods generated in the first PWM cycle; a third step of performing pulse shifting to shift a pulse phase of a PWM pulse in a second PWM cycle of the PWM control to generate two or one phase current measurement periods for measuring remaining two or one phase currents in the second PWM cycle; and a fourth step of measuring the remaining two or one phase currents from an output of the current sensor in the two or one phase current measurement periods generated in the second PWM cycle.

Metadata:
- Claim Count in Document: 11.0
- Percentile: 97.0
- Lexical Diversity: 2.38462
- Patent Class: 318.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['11125875', '13127613', '14302228', '12435703', '10761482']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.6926374169599532
- 35 USC 102 Novelty (BERT): 0.5006571544978234
- Combined Prediction Score: 0.6734393907137403
- Mean Citation Score: 271.318248
- Max Citation Score: 291.33185
- Similarity Product: 245.18035301514865

Labels:
- Claim Label 101: 1
- Claim Label 102: 0
- Claim Label 103: 1
- Claim Label 112: 1
- Combined Label: 0
- Label 101 Adjusted: 1

Dataset: test