Adaptive Feedback Divider for Wide-Range Voltage Regulation
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Solution Overview
Problem
Conventional voltage converters face inconsistencies and reduced accuracy in output voltage regulation, particularly at the lower end of a wide output voltage range, leading to inefficiencies and increased circuitry requirements.
Innovation Solution
Implementing adaptive feedback mechanisms with a digital multiplier divider and tap selector to maintain a predetermined voltage window for feedback signals, using a lookup table to adjust the divisor and switch selection based on the desired output voltage, thereby maintaining accurate regulation across the full output range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional voltage converter uses a fixed feedback divider, then the circuit complexity is low, but the voltage regulation accuracy deteriorates at the lower end of the output voltage range
Solution Approach 1:
The feedback divider is made dynamic by selecting different resistor taps based on the digital code input range. The tap selector switches between different division ratios (e.g., 8:1, 4:1, 2:1, 1:1) depending on which 256-code segment is being used, allowing the system to adapt the feedback scaling to match the desired output voltage range and maintain accuracy across the full 0-48V output range.
Solution Approach 2:
The digital code range is segmented into multiple 256-code segments, each corresponding to a specific output voltage range. Each segment has its own optimized feedback divider tap configuration. This segmentation allows the system to apply different feedback scaling factors for different voltage ranges, improving regulation accuracy without requiring a completely different circuit for each range.
2Adaptability or versatility
If the output voltage range is extended to cover wide ranges, then the adaptability is improved, but the consistency of voltage regulation deteriorates
Solution Approach 1:
The system dynamically adjusts the feedback division ratio based on the desired output voltage level. By detecting which 256-code segment is active and selecting the appropriate tap, the system maintains consistent regulation characteristics across the entire 0-48V range, preventing the consistency deterioration that would normally occur when extending the voltage range.
Solution Approach 2:
The feedback divider ratio parameter is changed based on the operating conditions. Different division ratios (8:1, 4:1, 2:1, 1:1) are selected to match different output voltage ranges, ensuring that the feedback signal remains within the optimal input range of the error amplifier regardless of the desired output voltage level.
3Measurement precision
If additional circuitry is added to improve voltage regulation accuracy, then the measurement precision is improved, but the die area increases
Solution Approach 1:
The feedback divider network serves multiple functions: it provides the feedback signal for voltage regulation, and its tap selection mechanism also serves as a range indicator for the digital code segments. The same resistor network and switch matrix are used for both feedback scaling and determining the appropriate multiplier selection, eliminating the need for separate circuitry and reducing die area.
Solution Approach 2:
The tap selector switch matrix is merged with the feedback divider resistor network into a single integrated structure. The switches selectively connect different taps of the same resistor network to the feedback input, combining the functions of voltage division and range selection into one compact circuit block, thereby improving accuracy without proportionally increasing die area.
Data Source
AI summary
Systems and methods for operating a voltage converter are described. A circuit can multiply a digital code by a predetermined multiplier to obtain a product. The digital code can represent a desired output voltage of the voltage converter. The predetermined multiplier can cause the product to be maintained within a predetermined window. The product can be maintained within the predetermined window to cause an output of a reference digital-to-analog converter of the voltage converter to be maintained within a predetermined voltage window. The circuit can receive a feedback voltage indicating an output voltage of the voltage converter. The circuit can divide the feedback voltage by a divisor to obtain a divided voltage. The divisor can correspond to the digital code. The circuit can send the divided voltage to an error amplifier of the voltage converter.