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Secondary side control of resonant DC/DC converters

A secondary side, control unit technology, applied in the field of secondary side control

Active Publication Date: 2016-05-11
INFINEON TECH AUSTRIA AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Another conventional approach involves using a dual-edge modulation scheme, which results in the fastest achievable response

Method used

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  • Secondary side control of resonant DC/DC converters
  • Secondary side control of resonant DC/DC converters
  • Secondary side control of resonant DC/DC converters

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0023] Embodiments described herein use secondary side control in order to supply the load. The techniques described herein are finer granularity and may be two resistive drops, one resistive drop and one diode drop, or two diode drops in the case of a full bridge rectifier. The rectification and regulation circuit described herein includes a transformer winding, a full-wave rectifier, and a control unit. The full wave rectifier has a first pair of controllable rectifiers including a first transistor connected to a first terminal of the transformer winding and a second transistor connected to a second terminal of the transformer winding. The full wave rectifier may have only the first pair of controllable rectifiers, or may also have the second pair of controllable rectifiers, depending on whether a center-tapped configuration is used, as explained in more detail below. In either case, the control unit is operable to control the switching of the transistors of the full wave r...

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Abstract

Various embodiments of the invention relates to the secondary side control of resonant DC / DC converters. A secondary-side rectification and regulation circuit includes a secondary-side transformer winding, a full-wave rectifier circuit and a control unit. The full-wave rectifier has a first pair of controllable rectifiers including a first transistor connected to a first terminal of the secondary-side transformer winding and a second transistor connected to a second terminal of the secondary-side transformer winding. The control unit is operable to control switching of the transistors of the full-wave rectifier so that the full-wave rectifier (a) generates a rectified output for supplying a load by rectifying current through the secondary-side transformer winding or voltage across the secondary-side transformer winding and (b) regulates the rectified output.

Description

technical field [0001] The present application relates to resonant DC / DC converters and in particular to secondary side control of resonant DC / DC converters. Background technique [0002] Efficient high-frequency operation is possible due to the almost lossless switching of the resonant converter. However, in applications with highly dynamic loads and / or with isolation in the feedback path, implementation details practically limit the achievable frequencies. In the case of an isolated topology, an optocoupler is used to provide isolation between the sensed secondary side output (voltage and current) and the primary side controller. The controller of the resonant converter is responsive to the output to maintain the demand for regulation by adjusting the control variables of the primary side device. Optocouplers are slow devices that limit the achievable bandwidth of the control loop. This contradicts one of the benefits of high frequency operation being the ability to inc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH02M3/33592Y02B70/10H02M1/0058H02M3/33573H02M3/01
Inventor D·奇尔哈特
Owner INFINEON TECH AUSTRIA AG