PATENT CLAIM ANALYSIS

Application Number: 15764207
Application Type: Utility
Filing Date: 2018-03
Publication Date: 2018-10
Patent Classification: ["315", "193000"]

Abstract:
An LED drive circuit in which a bright change of an LED is suppressed even if the voltage of a full-wave rectified waveform fluctuates is provided. The LED drive circuit includes a bridge rectifier circuit, an LED string made up by a plurality of LEDs being connected in series and supplied with a current from the bridge rectifier circuit, and a current limiting circuit that has a current input terminal and a current output terminal connected onto a path that starts from the bridge rectifier circuit and returns to the bridge rectifier circuit via the LED string, which limits a current that flows through the LED string to an upper limit current value or smaller, and further, which decreases the upper limit current value in accordance with the amount of rise in the voltage when the voltage at the current input terminal viewed from the current output terminal rises.

Claim (Index 14):
The LED drive circuit according to  claim 1 , wherein\n the current limiting circuit further comprises a current detection resistor, a first operational amplifier, a second operational amplifier, a fifth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a first FET, a second FET, and a third FET, the other end of the switch element is connected to the current output terminal via the current detection resistor the other end of the current detection resistor is connected to the current output terminal, a non-inverting input terminal of the second operational amplifier is connected between the eighth resistor and the ninth resistor, an inverting input terminal is connected to one end of the current detection resistor, and an output terminal is connected to the control terminal, one end of the fifth resistor is connected to the drain of the first FET and the other end is connected to a path from a terminal that outputs a current of the bridge rectifier circuit up to the current input terminal via the LED string, the gates of the first FET and the second FET are connected to each other, the sources of the first FET and the second FET are grounded, the drain of the second FET, an inverting input terminal of the first operational amplifier, the source of the third FET, the seventh resistor, and the eighth resistor are connected to one another, the drain of the third FET is connected to a driver power source and the gate of the third FET is connected to an output terminal of the first operational amplifier, the seventh resistor, the eighth resistor, and the ninth resistor are connected in series in this order, one end of the ninth resistor is grounded, a first reference voltage is input to one end of the seventh resistor, and a second reference voltage lower than or equal to a voltage between the seventh resistor and the eighth resistor is input to a non-inverting input terminal of the first operational amplifier.

Metadata:
- Claim Count in Document: 1.0
- Percentile: 90.0
- Lexical Diversity: 2.19718
- Patent Class: 315.0
- Transitional Phrase Type: none
- Component Type: 0
- Foreign Priority: True
- Related Applications: ['15564669', '14384386', '14768366', '14879155', '14347736']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7545110073632028
- 35 USC 102 Novelty (BERT): 0.5032440594508395
- Combined Prediction Score: 0.7293843125719665
- Mean Citation Score: 266.709466
- Max Citation Score: 279.21838
- Similarity Product: 229.8431304831541

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