DC to DC Controller Low-Frequency Ripple Compensation
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Solution Overview
Problem
Conventional power supplies face challenges in effectively eliminating low-frequency output voltage ripple due to increased circuit complexity and cost when attempting to enhance low-frequency response speed or add ripple suppression circuits, which can affect other low-frequency response characteristics.
Innovation Solution
A power supply method that utilizes zero-crossing information from the PFC circuit and load information, acquired through a communication protocol, to perform compensation using a table-mapping means within the DC to DC controller, eliminating low-frequency ripple without altering the low-frequency response speed or requiring additional hardware.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the low-frequency response speed of the DC to DC conversion circuit is increased to eliminate low-frequency ripple, then the low-frequency ripple in output voltage is reduced, but the circuit complexity and manufacturing cost increase
Solution Approach 1:
The patent introduces a ripple compensation circuit that includes a ripple detection unit and a ripple compensation unit. The detection unit extracts low-frequency ripple components from the output voltage, and the compensation unit generates compensating signals to cancel these ripple components. This intermediary compensation mechanism eliminates ripple without requiring changes to the main DC to DC conversion circuit structure, thus resolving the contradiction between ripple elimination and circuit complexity.
2Manufacturing precision
If a ripple suppression circuit is added to eliminate low-frequency ripple, then the output voltage quality is improved, but the production cost increases
Solution Approach 1:
The patent uses a digital implementation approach where the ripple compensation unit operates in the digital domain using sampled voltage signals and digital signal processing algorithms. Instead of adding expensive analog ripple suppression hardware, the system creates a digital model of the ripple compensation process, significantly reducing production cost while maintaining output voltage quality.
3Manufacturing precision
If the low-frequency response speed is increased to eliminate ripple, then the ripple is reduced, but other low-frequency response characteristics are affected
Solution Approach 1:
The patent segments the control function into separate modules: the main DC to DC conversion control and the ripple compensation control. The ripple compensation unit independently processes only the low-frequency ripple components detected by the detection unit, leaving the main conversion circuit's low-frequency response characteristics unchanged. This functional segmentation allows ripple elimination without affecting other response characteristics.
Data Source
AI summary
A power supply has a power factor correction (PFC) circuit and a DC to DC conversion circuit. A DC to DC controller of the DC to DC conversion circuit acquires zero-crossing information and load information from the PFC circuit through a communication protocol, and performs a low-frequency compensation on a control command using a table-mapping means, thereby resolving the issues of higher controller complexity, changes of entire response characteristics and cost increase in conventional compensation technique.