Resonant converter
AssigneeInfineon Technologies AG
InventorsZan Wang, Dong Li, Jianwei Liu
Life of this patent
Estimating the term…
Abstract
A resonant converter includes first and second input terminals for applying an input voltage and first and second output terminals for providing an output voltage. A transformer includes a primary winding and a secondary winding, where both the primary winding and the secondary winding have a first and a second terminal. A series resonant circuit includes a capacitive element and the primary winding of the transformer. A switching circuit is connected between the input terminals and the series resonant circuit. A rectifier circuit is connected between the secondary winding and the output terminals. A clamping circuit is connected between one of the first and second terminals of the primary winding and the input terminals.
Claims19
A resonant converter, comprising:
- first and second input terminals configured to receive an input voltage;
- first and second output terminals configured to provide an output voltage;
- a transformer comprising a primary winding and a secondary winding, wherein the primary winding has a first terminal and a second terminal and wherein the secondary winding has a first terminal and a second terminal;
- a series resonant circuit comprising a capacitive element and the primary winding of the transformer, wherein the capacitive element is coupled between the second terminal of the primary winding and the second input terminal;
- a switching circuit connected between the first and second input terminals and the series resonant circuit, wherein the switching circuit comprises a first switch and a second switch;
- a control circuit configured to control the switching circuit, wherein
- for a first period of time, the first switch is open and the second switch is closed,
- for a second period of time, the switch is closed and the second switch is open,
- for a third period of time, the first switch and the second switch are open, wherein the third period of time is between the first period of time and the second period of time,
- for a forth period of time, the first switch is open and the second switch is closed, and
- for a fifth period of time, the first switch and the second switch are open, wherein the fifth period of time is between the second period of time and the forth period of time;
- a rectifier circuit connected between the secondary winding and the first and second output terminals;
- and
- a clamping circuit connected between the first input terminal and the second input terminal comprising
- a first clamping element coupled between the second terminal of the primary winding and the first input terminal, and
- a second clamping element coupled between the second terminal of the primary winding and the second input terminal.
A circuit comprising:
- a first input terminal;
- a first terminal of a first switch connected to the first input terminal;
- a first terminal of a second switch directly connected to a second terminal of the first switch;
- a second input terminal connected to a second terminal of the second switch;
- a transformer comprising
- a primary winding having a first terminal directly connected to the second terminal of the first switch, and
- a secondary winding;
- a first diode having a first terminal connected to the first input terminal and a second terminal directly connected to a second terminal of the primary winding;
- a second diode having a first terminal connected to the second input terminal and having a second terminal connected to the second terminal of the primary winding;
- a first terminal of a first inductor connected to the second terminal of the primary winding;
- a first capacitor having a first terminal connected to a second terminal of the first inductor and having second terminal coupled to the second input terminal;
- a first output terminal connected to a center tap of the secondary winding;
- a third diode connected between a first terminal of the secondary winding and the first output terminal;
- a second output terminal connected to a second terminal of the third diode;
- a fourth diode having a first terminal connected to a second terminal of the secondary winding and a second terminal connected to the second output terminal;
- and
- a first terminal of a second capacitor connected between the first output terminal and the second output terminal.
Dependencies are inferred from the claim text.