Predictive Current Positioning for Multiphase Voltage Regulators
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Solution Overview
Problem
Multiphase current regulation systems face challenges in achieving high bandwidth control and fast transient response, particularly in current sharing configurations, where latency and fixed frequency can limit dynamic current balance during high repetition rate transient events, leading to instability and current imbalances.
Innovation Solution
Implementing a predictive current positioning approach that drives all phases to a target current value different from the average, using digital pulse placement and advanced control algorithms to rapidly ramp currents and balance them in both steady-state and non-steady-state conditions, while adjusting charge at the output to correct transient deviations without requiring current measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional multiphase current regulation is used, then system simplicity is maintained, but transient response speed and bandwidth are limited due to latency and fixed frequency operation
Solution Approach 1:
The patent implements predictive current positioning that proactively adjusts phase currents toward target values before transient events occur or during the transient itself. The controller predicts required current adjustments and applies them in advance, eliminating the latency inherent in conventional reactive control that only responds after deviations are detected.
Solution Approach 2:
The system transitions from fixed-frequency operation to variable switching frequency operation, allowing the controller to dynamically adjust the switching frequency based on transient conditions. During transient events, the frequency increases to enable faster current adjustment, while during steady-state operation, it returns to nominal frequency to maintain efficiency.
2Stability of the object's composition
If all phases are driven to average current value, then current balance is achieved in steady-state, but current imbalances persist during transient events
Solution Approach 1:
Instead of applying uniform current control to all phases, the patent implements phase-specific target current values that are differentiated based on individual phase conditions and transient requirements. Each phase is driven to its own optimized target current rather than a common average, allowing localized adaptation to transient events while maintaining overall system balance.
Solution Approach 2:
The system dynamically changes the target current parameter for each phase based on transient conditions. During transient events, target currents are adjusted to account for phase-specific responses, loading conditions, and timing requirements, enabling the system to adapt to varying operational demands while maintaining current balance.
3Measurement precision
If current measurement and compensation are implemented, then current balance accuracy is improved, but system complexity and latency increase
Solution Approach 1:
The patent implements self-balancing current control where each phase automatically adjusts its own current based on predictive algorithms and phase-specific conditions, without requiring external measurement or compensation from other phases. The system uses inherent phase information and control models to achieve balance autonomously, eliminating the need for additional measurement circuitry and compensation loops.
Solution Approach 2:
The patent replaces physical current measurement systems with predictive current estimation using mathematical models and control algorithms. Instead of measuring actual currents and reacting to deviations, the system predicts required current values and positions phases accordingly, substituting mechanical/electrical measurement infrastructure with computational estimation.
Data Source
AI summary
Voltage regulators in a current share arrangement may provide a total current to a common load, and may be simultaneously turned on to ramp up member currents. Each voltage regulator may provide a respective member current in the current share configuration. A target current value may be determined from a cycle-averaged current value of the member currents and a voltage error value of the voltage regulator, and each member current may be ramped to the target current value instead of the cycle-averaged current value when the voltage regulators are turned on, resulting in more stable and balanced current ramping. A predictive multi-phase digital controller may therefore operate according to a target current determined based on a measured or inferred inductor current and an error voltage. Pulse-width, pulse position and pulse frequency (adding or skipping pulses) may be calculated according to the operation of the predictive multi-phase digital controller.