Parallel Buck-Boost and Boost Converter Voltage Control
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Solution Overview
Problem
Existing power source circuits face inefficiencies and noise issues due to continuous operation of boost converters, and temporary drops in output voltage when input voltage drops, leading to power loss and inefficiency.
Innovation Solution
A voltage control apparatus comprising a boost converter and a buck-boost converter configured in parallel, with a control circuit that switches between operative and inoperative states based on input voltage levels, allowing the buck-boost converter to maintain output voltage during transient states and reducing power loss by stopping boost operations when input voltage is sufficient.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the boost converter is operated all the time to prepare for input voltage drops, then the reliability of voltage supply is improved, but the transmission efficiency deteriorates and noise occurs
Solution Approach 1:
The buck-boost converter is operated in advance to maintain output voltage within acceptable ranges before input voltage drops occur, rather than waiting for voltage drops to happen. This preliminary action prevents the need for reactive boost conversion, improving overall efficiency while maintaining reliability.
Solution Approach 2:
The system dynamically switches between buck-boost converter operation and boost converter standby based on real-time input voltage conditions. When input voltage is stable and above threshold, the buck-boost converter handles regulation; when input voltage drops below threshold, the boost converter activates. This dynamic adaptation resolves the contradiction between continuous operation reliability and efficiency.
2Reliability
If the boost converter is operated all the time to prepare for input voltage drops, then the reliability of voltage supply is improved, but noise occurs
Solution Approach 1:
The buck-boost converter performs preliminary voltage regulation before input voltage drops occur, eliminating the need for reactive boost conversion that generates noise. This preliminary action maintains output stability while avoiding the noise-generating boost switching operations during normal operation.
Solution Approach 2:
The system uses the buck-boost converter's capability to handle both buck and boost operations as a beneficial feature, allowing it to maintain output voltage during input voltage drops without requiring a separate boost converter to operate continuously. This converts the potential harm of voltage instability into the benefit of controlled, low-noise regulation.
3Loss of energy
If the boost converter stops operation when input voltage is sufficient, then transmission efficiency is improved, but output voltage drops when input voltage fluctuates
Solution Approach 1:
The buck-boost converter is designed to perform multiple functions: it operates in buck mode during normal high input voltage conditions to maintain efficiency, and switches to boost mode when input voltage drops to maintain output stability. This multi-functionality allows a single converter to replace the need for separate boost and buck converters, resolving the contradiction between efficiency and reliability.
Solution Approach 2:
The buck-boost converter dynamically changes its operating mode based on input voltage conditions. When input voltage is above the threshold, it operates in buck mode for efficiency; when input voltage drops below the threshold, it switches to boost mode for stability. This dynamic mode switching resolves the contradiction between transmission efficiency and output voltage stability.
4Reliability
If a boost converter is provided to handle input voltage drops, then output voltage stability is improved, but device complexity increases
Solution Approach 1:
The buck-boost converter is designed to perform both buck and boost operations, making it a universal solution that replaces the need for separate boost and buck converters. This multi-functionality reduces device complexity while maintaining output voltage stability during input voltage drops, as the single buck-boost converter can handle both upward and downward voltage regulation needs.
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 configuration efficiently reduces output voltage drops caused by input voltage fluctuations, minimizing power loss and noise by strategically switching between boost and buck-boost converter operations.
Implementation Method 1
a boost converter configured to convert an input voltage to a voltage equal to or higher than a first voltage
Implementation Method 2
a buck-boost converter coupled with the boost converter in parallel and configured to convert the input voltage to a second voltage lower than the first voltage
Data Source
AI summary
A voltage control apparatus includes a boost converter configured to convert an input voltage to a voltage equal to or higher than a first voltage in an operative state and directly output the input voltage in an inoperative state, a buck-boost converter coupled with the boost converter in parallel and configured to convert the input voltage to a second voltage lower than the first voltage, a memory, and a processor coupled to the memory and configured to keep the buck-boost converter in the operative state, set the boost converter to the inoperative state when the input voltage is equal to or higher than the first voltage, and change the boost converter to the operative state when the input voltage is lower than the first voltage.