Multi-Modem Power Control for Voltage Droop Prevention
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Solution Overview
Problem
Multi-mode mobile communication devices face significant power consumption issues when multiple modems are active simultaneously, leading to peak current draw and potential battery voltage droop, which can cause device reset.
Innovation Solution
A method and circuit arrangement that restricts the transmit power level of one wireless modem when another is engaged in communication activity, using a power control indicator to maintain reduced power consumption and prevent voltage droop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple modems are allowed to operate simultaneously in a multi-mode communication device, then communication versatility and capability are improved, but peak current draw increases causing battery voltage droop and potential device reset
Solution Approach 1:
The patent implements dynamic power management by allowing modems to operate simultaneously but dynamically adjusting their transmit power levels based on real-time power availability. The system monitors battery voltage and dynamically scales down the power level of one modem when the other modem is actively transmitting, ensuring continuous communication capability while preventing voltage droop that would cause device reset.
2Adaptability or versatility
If multiple modems are allowed to operate simultaneously, then communication versatility is improved, but battery voltage stability deteriorates due to internal resistance and peak current
Solution Approach 1:
The patent employs feedback mechanisms where the system continuously monitors the operating state of each modem and the overall power consumption. When one modem is in active transmit mode, the system receives feedback about the current power draw and automatically adjusts the power level of the second modem accordingly. This closed-loop control ensures voltage stability is maintained while allowing both modems to remain operational and available for communication.
3Reliability
If transmit power level of second modem is restricted to reduced level, then voltage droop is prevented, but communication performance of second modem is reduced
Solution Approach 1:
The patent changes the power level parameter of the second modem dynamically based on the operational state of the first modem. When the first modem is transmitting, the system adjusts the power parameter of the second modem to a reduced level that is sufficient to maintain basic communication functionality and prevent voltage droop, while allowing full power operation when the first modem is inactive. This parameter adjustment maintains voltage stability while preserving adequate communication performance.
Data Source
AI summary
A multi-mode communication device (100) uses a first wireless modem (118) and a second wireless modem (120) which operates independently to facilitate communication over different air interfaces. Both modems are powered by a common battery (105). When the first wireless modem engages in a communication activity, the second wireless modem's maximum operating power level is reduced. When the first wireless modem ceases communication activity, the second wireless modems full operating power range is restored.