Non-synchronous Buck Converter Software Bootstrap Control
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Solution Overview
Problem
Maintaining proper functionality of buck converters in harsh downhole conditions is challenging due to voltage fluctuations, which can cause latch-up conditions and damage to the converter circuitry, especially when using fluid-driven turbines for power generation.
Innovation Solution
A non-synchronous buck converter with a software-based bootstrap controller that adjusts the set point based on the input voltage level to prevent latch-up conditions by determining a minimum set point value using equations like Set PointMin=Input Voltage−sqrt(2*E*L)/D, ensuring stable operation across varying voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a buck converter is used to reduce voltage level in harsh downhole conditions, then voltage reduction capability is improved, but reliability deteriorates due to latch-up conditions caused by voltage fluctuations
Solution Approach 1:
The patent implements dynamic adjustment of the bootstrap capacitor charge threshold based on the input voltage level. When input voltage fluctuates, the controller dynamically changes the threshold value to prevent latch-up conditions while maintaining proper MOSFET gate drive. This dynamic adaptation resolves the contradiction by allowing the converter to maintain reliability across varying voltage conditions while preserving voltage reduction capability.
Solution Approach 2:
The patent changes the operational parameter (bootstrap capacitor charge threshold) based on the input voltage level. By monitoring the input voltage and adjusting the threshold parameter accordingly, the system prevents latch-up conditions during voltage fluctuations. This parameter change approach allows the buck converter to maintain both voltage reduction function and operational reliability under harsh downhole conditions.
2Reliability
If additional hardware is added to prevent latch-up conditions, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent replaces potential hardware-based protection circuits with a software/control-based solution. Instead of adding complex hardware protection circuits, the implementation uses a controller that monitors input voltage and dynamically adjusts the bootstrap capacitor charge threshold through control logic. This substitution reduces device complexity while maintaining reliability by preventing latch-up conditions through intelligent control rather than additional hardware.
3Ease of operation
If the bootstrap capacitor charge threshold is fixed, then ease of operation is improved, but adaptability deteriorates under varying voltage conditions
Solution Approach 1:
The patent implements dynamic adjustment of the bootstrap capacitor charge threshold based on the input voltage level. When input voltage fluctuates, the controller dynamically changes the threshold value to prevent latch-up conditions while maintaining proper MOSFET gate drive. This dynamic adaptation resolves the contradiction by allowing the buck converter to maintain reliability across varying voltage conditions while preserving voltage reduction capability.
Solution Approach 2:
The patent employs feedback control where the controller monitors the input voltage level and uses this information to adjust the bootstrap capacitor charge threshold. This feedback mechanism allows the system to automatically adapt to varying voltage conditions, maintaining both ease of operation and adaptability. The controller continuously adjusts the threshold based on real-time voltage measurements, ensuring proper operation without manual intervention.
Data Source
AI summary
An example power converter system may include a non-synchronous buck converter and a controller coupled to the a non-synchronous buck converter to receive a voltage level provided by a power source to the non-synchronous buck converter. The controller may also determine a minimum set point value for the non-synchronous buck converter based, at least in part, on the received voltage level. The controller may also alter a set point of the non-synchronous buck converter if the determined minimum set point value is less than a target set point value of the non-synchronous buck converter.