Boost Converter Mode Switching for Stable DC Link Voltage
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Solution Overview
Problem
Boost converters used in electric transport refrigeration units (eTRU) often enter discontinuous mode (DCM) due to high-ripple currents, leading to uncontrollable DC voltage at the DC link capacitor.
Innovation Solution
A system and method for controlling a boost converter circuit that includes a controller configured to compare voltage levels of a power supply and a 3-phase inverter with a power threshold, and to operate the boost converter in either boost mode or rectification mode based on the comparison, thereby preventing the converter from entering DCM.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the boost converter operates in discontinuous mode (DCM) due to high-ripple currents, then the converter can handle variable power demands, but the DC voltage at the DC link capacitor becomes uncontrollable
Solution Approach 1:
The system dynamically switches between two operational modes (boost mode and rectification mode) based on real-time power threshold comparisons. The controller adjusts the converter's operation from continuous conduction mode (CCM) to discontinuous conduction mode (DCM) and vice versa, allowing the system to adapt to varying power demands while maintaining voltage stability through controlled transitions between modes.
Solution Approach 2:
The invention changes the operational parameters of the boost converter by switching between different conduction modes. By comparing power thresholds and adjusting the converter's operation accordingly, the system modifies key parameters such as duty cycle, switching frequency, and current conduction characteristics to prevent DCM while maintaining adaptability to load variations.
2Power
If the boost converter operates in boost mode to increase voltage, then the voltage output is improved, but the converter may enter discontinuous mode causing voltage instability
Solution Approach 1:
The controller implements feedback control by continuously monitoring power levels and comparing them against predefined thresholds. Based on this feedback, the controller determines whether to operate in boost mode or rectification mode, ensuring that voltage output requirements are met while preventing entry into unstable discontinuous conduction mode. The feedback mechanism adjusts operational parameters in real-time to maintain reliable voltage control.
3Ease of operation
If the boost converter operates in rectification mode to reduce voltage, then the voltage matching is improved, but the converter efficiency decreases
Solution Approach 1:
The system dynamically selects between boost mode and rectification mode based on real-time power threshold comparisons. Rather than operating continuously in rectification mode with reduced efficiency, the controller transitions to boost mode when appropriate, optimizing the balance between voltage matching requirements and energy efficiency. This dynamic mode selection ensures voltage matching is achieved only when necessary, minimizing energy losses.
Data Source
AI summary
Provided are embodiments for a system and method for controlling a boost control circuit. Embodiments include a power supply and a boost converter circuit coupled to the power supply, wherein the boost converter circuit is operable to provide power to the load. Embodiments also include a 3-phase inverter coupled to the boost converter, wherein the 3-phase-inverter is operable to provide a 3-phase output, and a controller coupled to the boost converter and the 3-phase inverter. The controller can be configured to receive a voltage level of a power supply and a voltage level of a 3-phase inverter; compare a power threshold to at least one of: the voltage level of the power supply and the voltage level of the 3-phase inverter; and control an operation of the boost converter circuit to operate in a boost mode or a rectification mode based at least in part on the comparison.