PATENT CLAIM ANALYSIS

Application Number: 15987499
Application Type: Utility
Filing Date: 2018-05
Publication Date: 2018-09
Patent Classification: ["363", "021030"]

Abstract:
Methods for operation of a phase-shifted full-bridge topology power converter in a true soft-switching mode, regardless of the value of the leakage inductance of the converter. To achieve this, a process of discharge of the parasitic capacitances across the switching elements from a part of the resonant leg starts after the entire, total energy in the leakage inductance is used, and the voltage across the primary switching elements reaches the specific lower level.

Claim (Index 9):
A method for operating a pulse-shifted full-bridge (PSFB) DC-DC converter, the converter comprising\n a primary side and a secondary side; a transformer having at least one primary winding at the primary side and at least one secondary winding at the secondary side; a leakage inductance formed between the at least one primary winding and the at least one secondary winding; a bridge formed by two legs connected in parallel, one leg being a linear leg and another leg being a resonant leg,\n wherein each leg is formed by corresponding bottom primary switching element and upper primary switching element, at the primary side, configured in a totem pole arrangement, \n wherein common terminals of the two legs are connected to an input voltage source, \n wherein shared terminals of switching elements within one leg, from the two legs, are connected to one end of the at least one primary winding and \n wherein shared terminal of the switching elements of another leg, from the two legs, are connected to another end of the at least one primary winding, \n wherein switching elements of a given leg, from the two legs, are configured to be complementary to each other during operation of the converter with a period of dead time that includes driving signals from one leg to be phase-shifted with respect to driving signals from another leg; \n first and second synchronized rectifiers at the secondary side; a first current injection circuit placed across the first synchronized rectifier, and a second current injection circuit placed across the second synchronized rectifier; at least one output inductor at the secondary side, wherein a first terminal of said at least one output inductor is connected to a load of the converter, wherein the second terminal is directly connected to a synchronized rectifier from the first and second synchronized rectifiers; and electronic circuitry configured, as a controller, to generate control signals to the primary switching elements, and to control the current injection circuits, the control signals having square waveforms; the method comprising: (a) Switching on an upper primary switching element of the resonant leg and a bottom primary switching element of the linear leg, said upper primary switching element of the resonant leg and the bottom primary switching element of the linear leg defining a first diagonal of the bridge while the first synchronized rectifier is on, transferring power from the primary side to the secondary side, wherein said transferring is characterized by linearly changing, with time, a first amplitude of first current flowing through the at least one output inductor and linearly increasing a second amplitude, of magnetizing current of said transformer, to a peak value of the second amplitude; (b) After switching off the bottom primary switching element of the linear leg and turning on the upper primary switching element of the linear leg continuing the transferring power to the load and continuing the linearly changing of the amplitude, of current flowing through the at least one output inductor, to a lowest value of said first amplitude while maintaining the magnetizing current at the peak value; (c) After switching off the upper switching element of the resonant leg, discharging a parasitic capacitance reflected across primary switching elements of the resonant leg, with the use of the leakage inductance; and (d) During the discharging of said parasitic capacitance, turning the first current injection circuit on with a time-delay after a moment of time when the upper primary switching element of the resonant leg is turned off; (e) Switching off the first synchronized rectifier after a sum of the second amplitude and an amplitude of current injected by the first current injection circuit exceeds the lowest value of the first amplitude, to force a first current to flow into the at least one primary winding while continuing said discharging, wherein the first current is a current injected by the first current injection circuit reduced by a current through the at least one output inductor connected to the first synchronized rectifier. (f) Cyclically repeating at least steps (a) through (e) with the use of the second synchronized rectifier and a second diagonal of the bridge, which is formed by the upper primary switching element of the linear leg and a bottom primary switching element of the resonant leg, and the second synchronized rectifier;

Metadata:
- Claim Count in Document: 53.0
- Percentile: 93.0
- Lexical Diversity: 1.61224
- Patent Class: 363.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: False
- Related Applications: ['15899243', '15068598', '14890088', '10912808', '14585925']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.8329985660265439
- 35 USC 102 Novelty (BERT): 0.5163734829758937
- Combined Prediction Score: 0.8013360577214789
- Mean Citation Score: 296.654004
- Max Citation Score: 335.72336
- Similarity Product: 268.3263774437332

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

Dataset: test