PATENT CLAIM ANALYSIS

Application Number: 15886081
Application Type: Utility
Filing Date: 2018-02
Publication Date: 2018-06
Patent Classification: ["318", "400130"]

Abstract:
A control circuit controls the operation of a brushless DC (BLDC) sensorless motor having a first terminal connected to a first winding, a second terminal connected to a second winding and a third terminal connected to a third winding. A driver circuit applies drive signals to the first and second terminals and places the third terminal in a high-impedance state. The drive signals include first drive signals at a first current amplitude and second drive signals at a second current amplitude different from the first current amplitude. A differencing circuit senses a first mutual inductance voltage at the third terminal in response to the first drive signals and senses a second mutual inductance voltage at the third terminal in response to the second drive signals. The differencing circuit further determines a difference between the first and second mutual inductance voltages and produces a difference signal that is used for zero-crossing detection and rotor position sensing.

Claim (Index 25):
A control circuit for controlling operation of a brushless DC (BLDC) sensorless motor having a first terminal connected to a first winding, a second terminal connected to a second winding and a third terminal connected to a third winding, comprising:\n a drive control circuit configured to control the generation of drive signals to the first and second terminals and place the third terminal in a high-impedance state; wherein the drive signals include first drive signals at a first current magnitude and second drive signals at a second current magnitude different from the first current magnitude; and a differencing circuit comprising:\n a multiplexing circuit having a first input coupled to said third terminal and a second input coupled to a reference signal; \n an analog to digital converter circuit having an input coupled to an output of the multiplexing circuit, said analog to digital converter circuit configured to convert the voltages at the third terminal and the reference signal to digital values; and \n wherein the drive control circuit comprises a logic circuit configured to process the digital values to produce a difference signal.

Metadata:
- Claim Count in Document: 62.0
- Percentile: 88.0
- Lexical Diversity: 2.54688
- Patent Class: 318.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: False
- Related Applications: ['14937248', '14098161', '15177752', '12172789', '14758981']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.6118613397893203
- 35 USC 102 Novelty (BERT): 0.5785991435403666
- Combined Prediction Score: 0.608535120164425
- Mean Citation Score: 252.220388
- Max Citation Score: 462.69675
- Similarity Product: 423.51530379290887

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

Dataset: test