Boost Converter Current Limit Control for Pseudo-Bypass
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Solution Overview
Problem
Existing power converter systems face design complexity and inefficiencies due to the need to transition between regulation and bypass modes to prevent output voltage collapse, which can result in the output voltage falling below the input voltage.
Innovation Solution
A boost converter with control circuitry that enforces a maximum current limit and dynamically increases current above this limit when the output voltage drops below the input voltage, maintaining the output voltage approximately equal to the input voltage, thereby eliminating the need for state transitions and associated complexities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a switch is closed between input voltage and output voltage during collapse conditions to maintain output voltage, then output voltage stability is improved, but design complexity increases due to state transitions between regulation mode and bypass mode
Solution Approach 1:
The patent extracts the bypass functionality from a separate operational mode and integrates it directly into the regulation mechanism. By removing the need for distinct regulation and bypass modes, the design eliminates state transition complexity while maintaining voltage stability through continuous regulation.
Solution Approach 2:
The regulation mode is designed to perform both voltage regulation and voltage support functions universally. The power converter can maintain output voltage during collapse conditions through the same regulation mechanism used during normal operation, eliminating the need for separate bypass mode circuitry and control logic.
2Reliability
If the boost converter operates under current-limited constraints to protect the system, then system reliability is improved, but output voltage may droop below the set point causing collapse conditions
Solution Approach 1:
The patent dynamically adjusts the current limit parameter based on operating conditions. During collapse conditions, the current limit is increased above the maximum current limit to provide sufficient current for voltage support, while under normal conditions the current limit remains constrained for system protection. This parameter adaptation resolves the contradiction between reliability and voltage stability.
Solution Approach 2:
The system transitions from static current limiting to dynamic current limiting where the current limit adapts in real-time based on voltage conditions. The control circuitry continuously monitors output voltage and adjusts the current limit accordingly, enabling the system to maintain reliability through current protection while avoiding voltage collapse through dynamic current increase when needed.
3Stability of the object's composition
If the current is dynamically increased above the maximum current limit to maintain output voltage equal to input voltage, then output voltage stability is improved, but energy consumption increases
Solution Approach 1:
The system takes preliminary action by detecting voltage droop conditions and increasing current before complete voltage collapse occurs. This preventive approach maintains voltage stability with minimal energy increase, as the current is only elevated above the maximum limit when actually needed during collapse conditions, rather than continuously.
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
This approach simplifies the design by maintaining the output voltage stability without the need for mode transitions, reducing design complexity and potential inefficiencies in power converter systems.
Implementation Method 1
a boost converter configured to receive an input voltage and boost the input voltage to an output voltage
Data Source
AI summary
A system may include a boost converter configured to receive an input voltage and boost the input voltage to an output voltage and control circuitry configured to enforce a maximum current limit to limit a current drawn by the boost converter and in response to the output voltage decreasing below the input voltage, dynamically increase the current above the maximum current limit to cause the output voltage to be approximately equal to the input voltage.