Multi-rail Switching Converter Interleaving Control Circuit
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Solution Overview
Problem
Multi-rail switching converters face challenges in achieving phase interleaving due to differing output voltages, ON-time periods, and switching frequencies across each rail, leading to increased input ripple and compromised Electromagnetic Compatibility (EMC) performance.
Innovation Solution
A multi-rail switching converter system with a master and slave configuration, where comparison circuits generate set signals based on output voltages and reference signals, and an interleaving control circuit adjusts the turn-ON moments of slave switching circuits by postponing or advancing their switching times based on phase zone judgments to achieve average phase-shift distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If each rail switching circuit operates independently with different output voltages and ON-time periods, then each circuit can be controlled simply, but phase interleaving cannot be achieved and input ripple increases
Solution Approach 1:
The patent introduces an interleaving control circuit as an intermediary component that receives switching control signals from the master switching circuit and generates adjusted switching control signals for slave switching circuits. This mediator synchronizes the switching phases of multiple rails by adjusting turn-ON moments based on phase zone judgments, thereby achieving phase interleaving while maintaining control simplicity through modular circuit design.
2Object-generated harmful factors
If phase interleaving is implemented to reduce input ripple, then EMC performance improves, but circuit structure becomes more complex
Solution Approach 1:
The interleaving control circuit is segmented into distinct functional modules: a phase zone judgment unit that determines the phase relationship between master and slave switching circuits, and a turn-ON moment adjustment unit that modifies switching timing based on phase zone. This segmentation allows the complex phase interleaving function to be implemented through modular, manageable circuit blocks, reducing overall system complexity while maintaining effective ripple reduction.
3Adaptability or versatility
If different ON-time periods are used for different output voltages, then each output can be optimized, but phase-shift distribution becomes non-average
Solution Approach 1:
The patent implements dynamic adjustment of turn-ON moments for slave switching circuits based on real-time phase zone judgments. The interleaving control circuit continuously monitors the phase relationship between master and slave circuits and dynamically modifies switching timing to maintain average phase-shift distribution. This dynamic control allows each output voltage to be optimized with different ON-time periods while simultaneously maintaining stable, balanced phase-shift distribution across all rails.
Data Source
AI summary
A multi-rail switching converter providing a plurality of output voltages has a master switching circuit, a plurality of slave switching circuits and a control circuit. The control circuit has an interleaving control circuit, the interleaving control circuit judges a phase zone of a corresponding slave switching circuit based on a switching control signal of the master switching circuit and a set signal of the corresponding slave switching circuit, and adjusts a turn-ON moment of the corresponding slave switching circuit based on the phase zone of the corresponding slave switching circuit.