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 1):
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 an amplifier circuit configured to sense a first mutual inductance voltage at the third terminal in response to the first drive signals and sense a second mutual inductance voltage at the third terminal in response to the second drive signals; \n a sample and hold circuit coupled to an output of the amplifier circuit to save one of the first and second mutual inductance voltages; and \n a comparator circuit having a first input coupled to an output of the sample and hold circuit to receive the saved one of the first and second mutual inductance voltages and a second input coupled to an output of the amplifier circuit to receive the another one of the first and second mutual inductance voltages, said comparator circuit configured to determine a difference between the first and second mutual inductance voltages and 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): 0.6122390461663431
- 35 USC 102 Novelty (BERT): 0.5777627443986354
- Combined Prediction Score: 0.6087914159895723
- Mean Citation Score: 252.220388
- Max Citation Score: 462.69675
- Similarity Product: 417.8911713068783

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

Dataset: test