Parallel DC-DC Converter Resolving Resolution-Speed Tradeoff
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Solution Overview
Problem
Conventional DC-DC converter devices using digital control methods face slow response velocity and instability in output voltage due to low resolution, especially when load resistance changes suddenly, requiring many control bits to maintain high resolution.
Innovation Solution
A DC-DC converter device employing a parallel structure with a main DC-DC converter unit and a sub DC-DC converter unit, where the sub unit includes a low drop output LDO regulator controlled by the difference between reference voltages, enhancing resolution and response speed by summing output currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If digital control method with binary code is used to adjust output voltage, then power consumption is low and response velocity is rapid, but resolution of output power becomes low and voltage stability deteriorates
Solution Approach 1:
The patent divides the output current into multiple channels (first output current from main DC-DC converter unit and second output current from sub DC-DC converter unit). Each channel operates with fewer control bits, achieving high resolution through parallel segmentation rather than requiring many bits in a single channel.
2Measurement precision
If many control bits are used to increase resolution of output power, then voltage stability is improved, but system complexity increases and response velocity becomes slow
Solution Approach 1:
The system segments the control function across multiple parallel converter units, each handling a portion of the total output current. This allows each unit to use fewer control bits while maintaining high overall resolution, avoiding the complexity of managing many bits in a single converter.
Solution Approach 2:
The patent transitions from a single-dimensional control approach (one converter with many control bits) to a multi-dimensional parallel structure (multiple converters with fewer bits each). This dimensional change in system architecture resolves the contradiction between resolution and complexity.
3Measurement precision
If many control bits are used to maintain high resolution, then output power resolution is improved, but response velocity to load resistance changes becomes slow
Solution Approach 1:
By segmenting the output current across parallel converter units, each unit can respond rapidly with fewer control bits. The combined effect maintains high resolution while each unit's simpler control logic enables faster response to load changes.
4Measurement precision
If parallel structure with multiple converter units is used, then resolution of output power is improved and response velocity is quickened, but device complexity increases
Solution Approach 1:
The patent merges multiple DC-DC converter units in parallel, where each unit contributes a portion of the total output current. This combining approach achieves high resolution through the additive effect of multiple units, each operating with simpler control logic, thereby balancing resolution improvement with manageable complexity.
Data Source
AI summary
A DC-DC converter device and a sub DC-DC converter unit with parallel structure included in the same are disclosed. The DC-DC converter device includes a main DC-DC converter unit configured to receive a (1-1)th reference voltage, a (1-2)th reference voltage and a (n−1)th output voltage, and output an nth first output current corresponding to an nth output voltage; and a sub DC-DC converter unit configured to receive a second reference voltage and the (n−1)th output voltage, and output an nth second output current corresponding to the nth output voltage. Here, an output current in accordance with the nth output voltage corresponds to sum of the nth first output current and the nth second output current.