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US 9,866,146 B2Granted
Enhanced flyback converter
AssigneeOhio State Innovation Foundation
InventorsJin Wang, Xuan Zhang, Ke Zou
Life of this patent
Estimating the term…
Abstract
A DC/DC flyback converter that exhibits reduced switch and transformer voltage stresses in comparison to known flyback converters. The flyback converter also employs soft switching. Embodiments of such flyback converters may be used, without limitation, in electric vehicles and hybrid electric vehicles. A front-stage of the flyback converter comprises a DC/AC step-down circuit that may be separately used for various purposes.
Claims20
A bidirectional direct-current-to-alternating-current (DC/AC) circuit, comprising:
- a voltage source to supply an input voltage;
- a first switch connected to the voltage source and a first capacitor;
- a pair of second switches, wherein each switch of the pair of second switches is connected to the first capacitor and further connected to a second capacitor such that the first capacitor and the second capacitor are separated by the pair of second switches;
- and
- a component connected to the first capacitor and the second capacitor, wherein the component is further coupled to a load;
- wherein the first switch and the pair of second switches are selectively turned-on to define a plurality of modes of steady state operation for the bidirectional DC/AC circuit within a switching period;
- wherein, during a first mode of the plurality of modes of steady state operation, the first capacitor, the second capacitor, and the component are connected in series, and are one of charged in series based on the input voltage and discharged in series;
- and
- wherein, during a second mode of the plurality of modes of steady state operation, the first capacitor and the second capacitor are connected in parallel and are one of charged in parallel and discharged in parallel.
6 more elements
A bidirectional DC/AC circuit, comprising:
- a voltage source to generate an input voltage;
- a first switch connected to the voltage source and a first capacitor;
- a pair of second switches, wherein each switch of the pair of second switches is connected to the first capacitor and further connected to a second capacitor such that the first capacitor and the second capacitor are separated by the pair of second switches;
- and
- a component connected to the first capacitor and the second capacitor, wherein the component is connected to a load;
- wherein the first switch and the pair of second switches are selectively turned-on to define a plurality of modes of steady state operation of the bidirectional DC/AC circuit within a switching period;
- and
- wherein, during a given mode of the plurality of modes of steady state operation:
- the second pair of switches are turned-off while the first switch is turned-on;
- the first capacitor, the second capacitor, and the component are connected in series;
- and
- the first capacitor, the second capacitor are one of charged in series based on the input voltage and discharged in series.
9 more elements
A bidirectional direct-current-to-alternating-current (DC/AC) circuit, comprising:
- a voltage source to supply an input voltage;
- a first switch connected to the voltage source and a first capacitor;
- a pair of second switches, wherein each switch of the pair of second switches is connected to the first capacitor and further connected to a second capacitor such that the first capacitor and the second capacitor are separated by the pair of second switches;
- and
- a component connected to the first capacitor and the second capacitor, wherein the component is connected to a load;
- wherein the first switch and the pair of second switches are selectively turned-on to define a plurality of modes of steady state operation of the bidirectional DC/AC circuit within a switching period;
- wherein, during a given mode of the plurality of mode modes of steady state operation, the first switch is turned-on and the pair of second switches are turned-off, such that the first capacitor, the second capacitor, and the component are connected in series, and the first capacitor and the second capacitor are one of charged in series based on the input voltage and discharged in series;
- and
- wherein, during another mode of the plurality of modes of steady state operation, the pair of second switches are turned-on and the first switch is turned off such that the first capacitor and the second capacitor are connected in parallel and are one of charged in parallel and discharged in parallel.
6 more elements
Dependencies are inferred from the claim text.