DC-DC Converter Current Sensing Across Wide Dynamic Ranges
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Solution Overview
Problem
Conventional current sensors in DC-to-DC converters face challenges in achieving high accuracy over a wide current range and with high dynamics, leading to discontinuities when the expected current range is exceeded.
Innovation Solution
A DC-to-DC converter with multiple switched converter units and dedicated current sensors in each output line, controlled by a unit that adjusts duty cycles to minimize measurement errors by activating units with the most accurate sensors for the sum current, and optionally deactivating or reducing duty cycles to maintain accuracy across varying current ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single current sensor arrangement is dimensioned for a specific current range, then high measurement accuracy is achieved within that range, but measurement accuracy deteriorates when the current range is exceeded
Solution Approach 1:
The patent divides the current measurement system into multiple parallel converter units, each with its own current sensor. Each sensor is optimized for a specific current sub-range, allowing the system to segment the total current measurement into manageable portions that maintain high accuracy across the entire extended range.
Solution Approach 2:
The control unit dynamically adjusts the duty cycles of individual converter units based on the total current demand. By varying the activation and duty cycle of specific converter units, the system adapts to different current ranges in real-time, ensuring that the appropriate sensors operate within their optimal accuracy ranges.
2Adaptability or versatility
If the measuring range is switched when the expected current range is exceeded, then the measuring range is extended, but discontinuities occur in the measurement signal
Solution Approach 1:
Multiple converter units with overlapping current measurement ranges are merged in parallel. The control unit coordinates their operation so that transitions between different current ranges are smooth and continuous, eliminating discontinuities by ensuring that adjacent converter units operate in a coordinated manner with overlapping capabilities.
Solution Approach 2:
The system maintains continuous and smooth current measurement across the entire range by ensuring that converter units operate in a coordinated sequence. The control unit manages the transition between different converter unit combinations to maintain uninterrupted and continuous measurement signal without gaps or discontinuities.
3Adaptability or versatility
If multiple converter units are operated in parallel to extend the measuring range, then the measuring range is increased, but the control complexity increases
Solution Approach 1:
The control unit continuously monitors the total current demand and the operational status of individual converter units. Based on this feedback, it dynamically adjusts the duty cycles and activation states of converter units to maintain optimal measurement accuracy while managing the complexity through intelligent, adaptive control algorithms.
Solution Approach 2:
The control unit manages complexity by dynamically changing operational parameters (duty cycles, activation states) of converter units based on the total current demand. This parameter-based control approach allows flexible adaptation to different current ranges without requiring complex hardware reconfiguration.
Data Source
AI summary
DC-to-DC converter for converting an input direct voltage V1 into at least one variable output direct voltage Vout, comprising at least two switched converter units (2, 2′) each having at least one electronically controllable half bridge (3, 3′), and a control unit (4) which is designed to control the half bridges (3, 3′) in a modulation method with a variable period duration and a variable duty cycle, wherein a dedicated current sensor (6, 6′) is provided in each of the output lines (5, 5′) of the converter units (2, 2′), and the control unit (4) is designed to receive the amperages 12, 12′ of the converter units (2, 2′) measured by the current sensors (6, 6′), and to control the converter units (2, 2′) with duty cycles which differ from one another, in particular to activate individual converter units (2, 2′) with duty cycles which are reduced compared to other converter units (2, 2′), or not to activate these, wherein the output lines (5, 5′) of the converter units (2, 2′) are interconnected after the current sensors (6, 6′) so that the currents of the output lines (5, 5′) are summed, wherein the control unit (4) is designed to calculate the sum current Iout, and that the control until (4) is designed to compare the sum current Iout with the nominal currents IN, IN′ and to activate that converter unit (2, 2′) whose assigned current sensor (6, 6′) has a nominal current which is greater than the sum current Iout, but lies closest to the sum current Iout, or to activate those converter units (2, 2′) the sum of whose nominal currents is greater than the sum current, but lies closest to the sum current, so that the amperages in the output lines (5, 5′) of the activated converter units (2, 2′) are in each case below, but as close as possible to, the nominal current IN, IN′ of the assigned current sensors (6, 6′).