Module Power Switch Sequencing for Low-Inrush Chip Wake-Up
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Solution Overview
Problem
Current power-on methods for chipsets result in high inrush currents when waking up from sleep mode, with sequential power switch activation being slow and simultaneous activation causing significant inrush currents, posing challenges for energy efficiency and circuit stability.
Innovation Solution
A circuit structure with multiple modules, each with a power switch, where the turn-on order is determined by the magnitude of current values, starting with the maximum current value first and progressing to the minimum, to manage power switch activation and reduce inrush currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If all power switches are turned on at the same time, then the wake-up time is short, but a very large inrush current occurs
Solution Approach 1:
The patent divides the power switch activation process into multiple segments by grouping power switches according to their current consumption characteristics. Instead of turning on all power switches simultaneously or in simple sequential order, the invention segments them into multiple groups that are activated in stages, thereby distributing the inrush current over time while maintaining relatively fast wake-up performance.
2Object-generated harmful factors
If power switches are turned on sequentially, then the inrush current is reduced, but the wake-up time becomes long
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing the current consumption values of different power switch groups before system operation. The controller has this information readily available, allowing it to quickly determine the optimal activation sequence without performing complex real-time calculations, thus reducing wake-up time while maintaining controlled current activation.
Solution Approach 2:
The invention implements a dynamic power switch activation strategy where the activation sequence is determined based on stored current consumption characteristics of different power switch groups. The system dynamically selects which group to activate next based on the current operational state and power consumption requirements, optimizing both wake-up time and inrush current control.
3Device complexity
If circuits are activated without considering current values, then the control is simple, but circuit damage may occur due to high inrush current
Solution Approach 1:
The patent performs preliminary action by pre-measuring and storing the current consumption values of different power switch groups before normal operation. This advance preparation allows the controller to make informed activation decisions without complex real-time measurements, maintaining simple control logic while ensuring circuit reliability through current-aware activation sequencing.
Data Source
AI summary
A circuit structure is electrically connected to a power source. The circuit structure includes a first circuit module and a second circuit module. The first circuit module includes a first module power switch and a plurality of circuits. The first module power switch is electrically connected to the power source. The first circuit module has a first module current. The second circuit module includes a second module power switch and a plurality of circuits. The second power switch is electrically connected to the power source. The second circuit module has a second module current. A turn-on order of the first module power switch and the second power switch is determined based on the first module current and the second module current.