Cross-Power PMIC Phase Switching for Light-to-Heavy Load Efficiency

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Solution Overview

Problem

Power converters face inefficiencies when designed to handle both heavy and light loads, as optimizing for one type of load can negatively impact efficiency in the other, and existing systems struggle to seamlessly transition between power modes without disrupting operations or risking component damage.

Innovation Solution

A power conversion system incorporating a PMIC with a baby phase and an external power module, controlled by a controller that seamlessly switches between high and low power modes by activating or deactivating phases, ensuring efficient power delivery to varying loads while protecting components from excessive power draw.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If a power converter is optimized for heavy loads, then power delivery capability is improved, but efficiency under light loads deteriorates

Engineering Contradiction:

Improvepower delivery capabilityVSAvoidefficiency under light loads

Core Design Contradiction:

PowerVSLoss of energy

Solution Approach 1:

The power converter is divided into multiple independent phases, with each phase capable of operating autonomously. The controller can selectively activate or deactivate individual phases based on load conditions, allowing the system to scale power delivery capability while maintaining optimal efficiency at each operating point.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system dynamically adjusts the number of active phases based on real-time load conditions. During heavy loads, multiple phases operate simultaneously to provide sufficient power delivery; during light loads, fewer phases are activated to minimize energy loss and improve efficiency.

Inventive Principle:

Principle #15Dynamics

2Loss of energy

If a power converter is optimized for light loads, then efficiency under light loads is improved, but power delivery capability deteriorates

Engineering Contradiction:

Improveefficiency under light loadsVSAvoidpower delivery capability

Core Design Contradiction:

Loss of energyVSPower

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Each phase is designed to be universally applicable across different load conditions. The same phase architecture can handle both light and heavy loads, and the controller intelligently combines multiple phases to achieve the required power delivery while maintaining efficiency characteristics.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Loss of energy

If phases are deactivated to improve efficiency under light loads, then energy loss is reduced, but transition smoothness deteriorates due to potential disruptions

Engineering Contradiction:

Improveenergy lossVSAvoidtransition smoothness

Core Design Contradiction:

Loss of energyVSStability of the object's composition

Solution Approach 1:

The controller prepares for phase transitions in advance by pre-charging or discharging output capacitors and adjusting duty cycles before switching phases on or off. This preliminary action ensures that voltage and current remain stable throughout the transition, preventing disruptions and maintaining output stability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system employs feedback control to monitor output voltage and current during phase transitions. Based on real-time feedback, the controller dynamically adjusts switching timing and duty cycles to ensure smooth transitions that maintain stable output power delivery without causing voltage dips or current spikes.

Inventive Principle:

Principle #23Feedback

4Power

If phases are activated to increase power delivery capability, then power output is improved, but complexity of control increases

Engineering Contradiction:

Improvepower outputVSAvoidcomplexity of control

Core Design Contradiction:

PowerVSDevice complexity

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Each phase includes self-contained control logic and protection circuits that autonomously manage its operation. This self-service capability reduces the burden on the central controller, simplifying overall system control while still enabling coordinated multi-phase operation for increased power output.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS12573957B2Cross power management integrated circuit

Publication Date: 2026.03.10 RENESAS ELECTRONICS AMERICA INC

AI summary

Systems and methods for power conversion are described. A power converter can operate under low power mode to supply a first load current from a power management integrated circuit (PMIC). The power converter can transition from low power mode to high power mode by one of activating a tri-state mode of the PMIC prior to activating at least one phase in an external power module and operating PMIC and at least one phase of the external power module simultaneously. The external power module and PMIC can be on separate chips. The power converter can operate under high power mode to supply a second load current from the external power module. The second load current can be greater than the first load current. The power converter can transition from high power mode to low power mode by selectively deactivating phases in the external power module prior to activating the PMIC.