Multiphase Voltage Regulator Phase Control via Duty Cycle Derivative

The patent implements dynamic phase activation control where the number of active phases is adjusted in real-time based on the relationship between output current and duty cycle. Instead of using fixed current thresholds, the system continuously monitors the derivative of duty cycle with respect to output current and activates or deactivates phases based on whether this derivative exceeds predefined thresholds. This dynamic approach allows the regulator to optimize efficiency across the entire operating range while maintaining manageable control complexity through standardized derivative-based decision rules.

The patent changes the control parameter from fixed current thresholds to dynamic duty cycle derivatives. By calculating the derivative of duty cycle with respect to output current (dD/dIout) and comparing it against threshold values, the system adapts phase activation decisions to the actual operating conditions. This parameter transformation enables efficiency optimization because the duty cycle derivative inherently reflects the marginal efficiency gain of additional phases at different operating points, allowing the controller to make optimal phase activation decisions throughout the full current range.

The system dynamically adjusts the number of active phases based on real-time calculation of the duty cycle derivative. When the derivative dD/dIout is below a threshold, it indicates that adding another phase would provide minimal efficiency improvement, so the system maintains fewer active phases to reduce switching losses. When the derivative exceeds the threshold, it signifies that the efficiency gain from additional phases outweighs the switching losses, prompting phase activation. This dynamic balance allows the regulator to handle varying power levels while optimizing efficiency at each operating point.

The patent uses the duty cycle derivative (dD/dIout) as a dynamic parameter to determine the optimal number of active phases. By monitoring how the duty cycle changes with respect to output current, the system identifies operating points where phase activation becomes efficient. This parameter-based control enables the regulator to automatically transition between different phase configurations, ensuring that phases are activated only when the power handling requirement justifies the additional switching losses, thus optimizing the power-to-efficiency tradeoff across all operating conditions.