Multi-Stage Power Converter Stage Bypass via Power Detection
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Solution Overview
Problem
Multi-stage power converters experience efficiency degradation at input power levels below maximum due to unnecessary power consumption by individual stages, and inefficiencies arise from using multiple stages for varying load power levels, necessitating selective powering or bypassing of stages.
Innovation Solution
An auxiliary bias circuit with a sensor and input power level detection circuit is employed to selectively provide power to or bypass stages in a multi-stage power converter based on feedback from energy transfer elements, using different circuit responses to determine power delivery to stages like a power factor correction and flyback converter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple converter stages are used in a multi-stage power converter, then the converter can handle varying power levels and provide stable output, but efficiency degrades at lower input power levels due to unnecessary power consumption by all stages
Solution Approach 1:
The patent implements dynamic stage activation where converter stages are selectively enabled or disabled based on real-time power level detection. The controller monitors input power levels and dynamically adjusts which stages remain active, transitioning from all stages active at high power to selective stage activation at lower power levels, thereby optimizing efficiency while maintaining stable output when needed.
Solution Approach 2:
The multi-stage power converter is divided into independent converter stages that can be individually controlled. Each stage can be selectively powered on or off based on load requirements, allowing the system to segment its operation and activate only the necessary portions, reducing unnecessary power consumption while maintaining overall system reliability.
2Reliability
If all converter stages are powered continuously, then stable output is maintained across varying loads, but power consumption increases unnecessarily at lower input power levels
Solution Approach 1:
The system employs dynamic power management where the controller continuously monitors input power levels and adjusts stage activation in real-time. At high power levels, all stages remain active to ensure stable output; at lower power levels, the controller dynamically deactivates unnecessary stages, reducing power consumption while maintaining adequate output stability through the remaining active stages.
Solution Approach 2:
The patent changes the operational parameters of the converter stages by adjusting their power states (on/off) based on detected power levels. This parameter change allows the system to adapt its power consumption characteristics to match actual load requirements, reducing energy waste while preserving output stability through selective stage operation.
3Device complexity
If a simple power detection method is used, then device complexity is reduced, but the ability to accurately detect and respond to different power levels diminishes
Solution Approach 1:
The patent uses an auxiliary winding on the transformer as an intermediary element to detect power levels. This winding provides isolated voltage proportional to the input power level, serving as a mediator between the power converter stages and the control circuitry. This approach enables accurate power level detection without requiring complex sensing circuits, maintaining measurement precision while limiting device complexity through the use of this intermediate sensing mechanism.
Data Source
AI summary
Aspects of the present disclosure describe power converters. A power converter in accordance with an aspect of the present disclosure may comprise a first stage, a second stage electrically coupled to the first stage, the second stage including an energy transfer element, and a sensor. The sensor may include a first circuit and a second circuit. The first circuit and the second circuit may respond differently to an output of the energy transfer element. The sensor may be configured to selectively provide power to the first stage based on a difference in response of the first circuit and the second circuit.