Power Converter Phase Aging Compensation via Equivalent Time Control
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Solution Overview
Problem
Power converters experience inefficiencies due to aging switches, as existing technologies do not effectively compensate for the varying operational conditions and wear of multiple phases, leading to uneven usage and potential switch failure.
Innovation Solution
A controller system that determines the aging of switches in a power converter by calculating the equivalent operating time based on activation energy and temperature, adjusting the number of active phases to equalize wear and prevent overuse, thereby extending the lifespan of all switches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If multiple converter stages are operated in sequence, then fast response and low ripple are achieved, but uneven usage and premature failure of switches occur due to aging
Solution Approach 1:
The patent implements dynamic phase selection by continuously monitoring equivalent operating time Teq for each converter stage and adjusting which phases are active based on current Teq values. This dynamic adjustment ensures that phases with lower accumulated stress are preferentially used, preventing any single phase from excessive aging while maintaining the fast response characteristics of multi-phase operation.
Solution Approach 2:
The patent changes the operational parameters of the converter by introducing Teq as a new control parameter that combines time and temperature effects. By using Teq to determine phase activation, the system optimizes the distribution of operational stress across phases, extending switch lifespan while preserving performance.
2Reliability
If all converter stages are operated to reestablish regulation, then regulation is maintained, but switch aging accelerates unevenly across phases
Solution Approach 1:
The patent implements a feedback mechanism where the controller continuously monitors Teq for each phase and uses this information to make intelligent decisions about which phases to activate. This feedback loop ensures that when regulation needs to be reestablished, the system selects phases that will maintain more uniform aging characteristics, preventing any single phase from being overused.
Solution Approach 2:
The patent performs preliminary calculation of Teq for each phase before determining which phases to activate. This preliminary assessment allows the system to proactively select phases that will result in more balanced usage patterns, preventing uneven aging before it occurs rather than reacting to it after the fact.
3Loss of energy
If converter stages are operated sequentially starting with lowest inductor current, then ripple is minimized, but Teq accumulation becomes uneven leading to premature failure
Solution Approach 1:
The patent replaces the static sequencing approach with a dynamic phase selection method that adjusts based on accumulated Teq. Instead of always starting with the same phase or using fixed inductor current as the sole criterion, the system dynamically selects phases based on their current Teq status, ensuring more equitable distribution of operational stress while maintaining low ripple performance.
Solution Approach 2:
The patent introduces asymmetric phase selection criteria by using Teq values to determine phase activation rather than treating all phases symmetrically. This asymmetric approach allows the system to favor phases that have accumulated less thermal-time stress, creating a more balanced aging pattern across all switches while preserving the energy efficiency benefits of selective phase operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system ensures balanced usage of all phases, preventing premature failure by activating the appropriate number of phases based on current and temperature conditions, thereby maintaining efficient operation and extending the lifespan of the power converter.
Implementation Method 1
determine an aged condition for that the at least one first switch for the first phase based on an equivalent time, Teq of the at least one first switch, wherein Teq corresponds to an amount of time the at least one first switch is active and on an operating temperature of the at least one first switch
Data Source
AI summary
In at least one embodiment, an apparatus for providing age-compensation control for a power converter is provided. The apparatus comprises a controller for being coupled to a power converter including a plurality of phases for converting a first input signal into a first output signal. The controller is configured to activate at least one first switch for a first phase from the plurality of phases for converting the first input signal into the first output signal. The controller is further configured to determine an aging condition for the at least one first switch for the first phase based on an equivalent time, Teq of the at least one first switch, wherein Teq corresponds to an amount of time the at least one first switch is active and on an operating temperature of the at least one first switch while the at least one first switch is active.