Boost Converter Load Distribution via Dynamic Circuit Segmentation
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Solution Overview
Problem
Existing boost converter technologies constantly energize a single inverter, leading to uneven load distribution among switching elements, resulting in premature deterioration of the switching element handling the heavier load, and do not account for a boost converter scenario.
Innovation Solution
A boost converter configuration that dynamically adjusts the number of boost circuits energized based on charge current levels, distributing the load across different switching elements through multiple boost circuits and operations, ensuring that no single switching element bears an excessively high load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single inverter is constantly energized to simplify control, then control simplicity is improved, but the switching element bears heavier load and deteriorates earlier
Solution Approach 1:
The system divides the inverter into multiple independent inverters (first inverter and second inverter), each with its own switching elements. By segmenting the load across multiple inverters that can be selectively energized, no single switching element bears excessive continuous load, thereby improving durability while maintaining control simplicity through independent operation of each inverter unit.
2Reliability
If multiple boost circuits are energized to distribute load, then switching element durability is improved, but system complexity increases
Solution Approach 1:
The system dynamically adjusts the number of energized boost circuits based on real-time charge current magnitude. When charge current is small, fewer boost circuits are energized; when charge current is large, more boost circuits are energized to distribute the load. This dynamic adaptation allows the system to maintain reliability by distributing load when needed while avoiding unnecessary complexity when load distribution is not required.
3Loss of energy
If the number of energized inverters is changed based on output power, then power conversion efficiency is improved, but load distribution among switching elements becomes uneven
Solution Approach 1:
The control circuit alternates between different patterns of energizing boost circuits in a periodic manner. Instead of continuously energizing the same set of boost circuits based on output power, the system periodically switches between different combinations, ensuring that different switching elements take turns bearing the heavier load. This periodic rotation of load distribution improves both power conversion efficiency and switching element durability.
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 enhances the reliability and longevity of the boost converter by evenly distributing the load among switching elements, preventing premature deterioration and improving overall efficiency across varying charge current ranges.
Implementation Method 1
a reactor connected between the high-potential input wiring and the anode of the diode
Implementation Method 2
a capacitor connected between the high-potential output wiring and the low-potential wiring
Implementation Method 3
a diode, a cathode of the diode being connected to the high-potential output wiring
Data Source
AI summary
A boost converter disclosed herein may include boost circuits including: a diode including a cathode connected to a high-potential output wiring; a switching element including a terminal connected to an anode of the diode and a terminal connected to a low-potential wiring; and a reactor connected between the high-potential input wiring and the anode. A control circuit may energize, in a first operation, a first boost circuit when charge current is in a first range, and energize the first and a second boost circuits when the charge current is in a second range larger than the first range. The control circuit may energize, in a second operation, a third boost circuit when the charge current is in the first range, and energize the third and a fourth boost circuits when the charge current is in the second range. The first boost circuit is other than the third boost circuit.