Multiphase Switching Regulator Phase Current Sharing
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Solution Overview
Problem
Conventional multiphase switching regulators using synthetic ripple regulation face challenges in maintaining high-frequency current balance between phase networks, particularly during transient events, leading to imbalanced current sharing and reduced efficiency.
Innovation Solution
The implementation of transconductance amplifiers to simulate the function of ripple resistors and mirror currents between phase networks, ensuring balanced current sharing by amplifying the difference between reference and ripple voltages and distributing these currents across all phase networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional synthetic ripple regulation is used in multiphase switching regulators, then the circuit structure is simple, but high-frequency current balance between phase networks deteriorates during transient events
Solution Approach 1:
The patent implements a feedback mechanism where the ripple voltage from each phase is fed into a transconductance amplifier that generates a balancing current. This feedback loop continuously monitors and corrects current imbalances between phases, ensuring stable current distribution during transient events while maintaining the simplicity of the overall circuit architecture.
Solution Approach 2:
The patent introduces transconductance amplifiers as intermediary elements that convert ripple voltage signals into balancing currents. These amplifiers act as mediators between the phase networks, transforming voltage ripple information into corrective current actions that restore current balance without requiring direct complex inter-phase coupling.
2Stability of the object's composition
If phase current sharing is improved using transconductance amplifiers, then current balance is maintained, but device complexity increases
Solution Approach 1:
The patent applies local quality by implementing transconductance amplifiers individually in each phase network rather than using a complex global control mechanism. Each phase has its own local current balancing circuitry that processes its specific ripple voltage and generates appropriate balancing current, allowing for modular implementation and maintaining current sharing balance without excessive overall complexity.
Data Source
AI summary
A phase current sharing network that adjusts operation of a current mode multiphase switching regulator in which the phase current sharing network includes multiple synthetic ripple networks and a current share network. The regulator develops phase currents including ripple currents through corresponding phase inductors as controlled by corresponding pulse control signals. Each synthetic ripple networks develops a corresponding ripple voltage that simulates a corresponding phase ripple current and uses the ripple voltages to develop the pulse control signals. The current share network adjusts each ripple voltage by a combined adjustment value. The combined adjustment value is a combination of phase adjustment values in which each phase adjustment value is based on a difference between a corresponding one of ripple voltage and a reference voltage. Transconductance amplifiers may be used to convert the voltage differences to current adjust values applied to the ripple capacitors developing the ripple voltages.