USB-C Power Rail Switching for ErP6 Soft-Off Compliance
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Solution Overview
Problem
Information handling systems face challenges in meeting regulatory requirements for low power consumption during soft power-off states, such as the European Commission's ErP6 directive, due to inefficient voltage regulation and high power draw from retaining high main power rail voltages.
Innovation Solution
The system employs a battery-disconnection mechanism and voltage negotiation with a USB Type-C power adapter to reduce the main power rail voltage during soft power-off states, utilizing a NVDC charger and pass-through circuit to minimize conversion losses and meet the 500 milliwatt current draw requirement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the system retains high main power rail voltages during soft power-off state, then the system can maintain readiness for quick wake-up, but the power draw exceeds the 500 milliwatt requirement of ErP6 directive
Solution Approach 1:
The system dynamically adjusts the main power rail voltage based on the power state. During soft power-off, the voltage is reduced to meet ErP6 requirements, while during active operation, the voltage is maintained at higher levels for optimal performance. This dynamic voltage adjustment allows the system to balance between wake-up speed and power consumption.
Solution Approach 2:
The system performs preliminary voltage negotiation with the USB Type-C power adapter before entering soft power-off state. By negotiating for a lower voltage level in advance, the system ensures that the main power rail voltage is already reduced when the soft power-off state is entered, thereby meeting ErP6 requirements without compromising the ability to quickly wake up.
2Stability of the object's composition
If the system uses traditional voltage regulation methods during soft power-off, then voltage stability is maintained, but conversion losses exceed acceptable limits for ErP6 compliance
Solution Approach 1:
The system changes the voltage parameter during soft power-off state by negotiating with the USB Type-C power adapter to provide a lower voltage level. This parameter change reduces the conversion loss in the voltage regulation circuit while maintaining sufficient voltage stability for essential functions. The pass-through circuit mode further minimizes conversion losses by bypassing the voltage regulation stage.
Solution Approach 2:
The USB Type-C power adapter acts as an intermediary between the external power source and the main power rail. By negotiating voltage levels with the adapter, the system can receive power at an optimized voltage level that reduces conversion losses. The pass-through circuit serves as another intermediary that directly transfers power with minimal conversion when appropriate.
3Reliability
If the system maintains battery charging during soft power-off state, then battery readiness is ensured, but additional power draw increases total consumption beyond ErP6 limits
Solution Approach 1:
The system applies partial charging action during soft power-off state by maintaining just enough charging current to ensure battery readiness without fully charging the battery. This partial action approach ensures the battery is ready for quick wake-up while keeping the power draw within ErP6 limits. The system monitors battery charge level and adjusts charging current accordingly.
Data Source
AI summary
An information handling system includes a battery and a charger. The battery provides a battery voltage to a main power rail of the information handling system and is couplable to the main power rail through a switch. The charger has an output coupled to the main power rail and an input coupled to an external power adapter. The power adapter provides a selectable voltage level to the input. The information handling system selects a particular voltage level that is lower than the battery voltage and directs the switch to decouple the battery from the main power rail when the information handling system is in a soft power-off state.