Multiphase DC-DC Converter Current Balancing Control
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Solution Overview
Problem
Multiphase DC-DC converters face challenges in noise performance and sensitivity when processing high currents due to component deviations, leading to current concentration in individual converters.
Innovation Solution
A control unit is implemented for multiphase DC-DC converters that includes current sensing, averaging, and triangular wave generation to balance output currents across multiple converters connected in parallel, reducing power consumption and preventing current concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple DC-DC converters are connected in parallel to process high current, then the current processing capability is improved, but current concentration occurs due to component deviation
Solution Approach 1:
The patent implements a feedback control mechanism where the control unit continuously monitors the output currents of individual converters and adjusts their operating parameters accordingly. The control unit receives current information from each converter and modifies the duty cycle or switching frequency to balance the current distribution, preventing current concentration on any single converter while maintaining high total current processing capability.
Solution Approach 2:
The patent employs dynamic parameter adjustment where the operating parameters (such as duty cycle, switching frequency) of each converter are continuously varied based on real-time current measurements. This dynamic control allows the system to adapt to component deviations and maintain balanced current distribution across all parallel converters, rather than using fixed parameters that would lead to current concentration.
2Measurement precision
If conventional current sensing is used in high-current DC-DC converters, then current detection is achieved, but noise performance and sensitivity are degraded
Solution Approach 1:
The patent divides the current sensing function into multiple parallel sensing paths, each handling a portion of the total current. By segmenting the sensing task across multiple channels and then combining the signals through averaging, the system achieves high current measurement capability while maintaining low noise performance and high sensitivity, as each individual sensing channel operates at lower current levels with better signal-to-noise ratio.
Solution Approach 2:
The patent combines multiple current sensing signals through an averaging operation to produce a composite current measurement. By merging the outputs of multiple low-noise sensing channels and averaging them, the system achieves both high current processing capability and excellent noise performance, as the averaging process reduces random noise while preserving the true current signal.
Data Source
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AI summary
Disclosed is a DC/DC converter. The DC/DC converter includes n converters connected in parallel to each other and configured to adjust a level of an input voltage according to a duty ratio of a first pulse signal applied to a first switch device to output an output voltage, wherein the n is an integer of 2 or more; and a control unit configured to compare an average of n sensing currents with the n sensing currents sensed from the converters, respectively, to adjust the duty ratio of the first pulse signal.