PATENT CLAIM ANALYSIS

Application Number: 16070527
Application Type: Utility
Filing Date: 2018-07
Publication Date: 2019-01
Patent Classification: ["315", "291000"]

Abstract:
A switch power supply having active power factor correction is provided, including a power factor correction (PFC) circuit, a filter circuit, a main power stage, a first capacitor (C 1 ) and an indicating circuit. An alternating-current input (IN) is connected to the first capacitor through the PFC circuit and is connected to the filter circuit through the indicating circuit. The indicating circuit consists of a light emitting diode (LED) having unidirectional conductivity and an inductor (L); and the current direction of power supplied from the PFC circuit to the main power stage through the inductor is opposite to the conduction direction of the LED. The LED may also be a light emitter of a photocoupler. The filter circuit at least comprises an electrolytic capacitor (C 2 ). When the electrolytic capacitor is normal, an exciting current of the main power stage basically does not appear in the inductor and the LED does not emit light. When the equivalent series resistance (ESR) of the electrolytic capacitor sharply rises, the exciting current appears in the inductor. When a power transistor in the main power stage is switched off, the exciting current in the inductor cannot be abruptly changed; instead, the exciting current passes through the LED for freewheeling and enables the LED to emit light, thereby notifying a user or a circuit that the electrolytic capacitor may have the risk of failure. The switch power supply has low additional cost and unchanged efficiency and is easy to implement.

Claim (Index 9):
The switching power supply having the active power factor correction according to  claim 8 , further comprising a third capacitor, wherein a connection relation is as follows: the first light emitting diode and the first resistor are connected in series, and then connected in parallel with the third capacitor to form a third network which is then connected in series with the first diode in the same direction to form a fourth network, the fourth network is connected in parallel with the secondary winding of the first transformer, and terminal, which is connected with the cathode of the fourth network, of the secondary winding is used as the dotted terminal, and the dotted terminal corresponding to the primary winding is used as the first terminal, and the other terminal of the primary winding is used as the second terminal.

Metadata:
- Claim Count in Document: 42.0
- Percentile: 95.0
- Lexical Diversity: 2.61682
- Patent Class: 315.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['16070776', '16034351', '15965085', '12380075', '13596696']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.6898364578249297
- 35 USC 102 Novelty (BERT): 0.5649287563675275
- Combined Prediction Score: 0.6773456876791896
- Mean Citation Score: 303.019504
- Max Citation Score: 431.52316
- Similarity Product: 368.72702167777777

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