RF Wakeup Circuit for Vehicle Wireless Node Power Management

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Solution Overview

Problem

Existing wireless vehicle monitoring systems face high power consumption and latency due to the need to periodically turn on main connectivity radios for polling to check for system-on signals, which is inefficient and delays connection establishment.

Innovation Solution

Implementing a low-power RF wakeup approach with a separate RF wakeup receiver that continuously monitors for a wake signal, allowing the main connectivity radio to be powered on only when necessary, reducing overall power consumption and latency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If the main connectivity radio is powered on continuously to monitor for system-on signals, then the response time is improved, but the power consumption increases

Engineering Contradiction:

Improveresponse timeVSAvoidpower consumption

Core Design Contradiction:

SpeedVSUse of energy by moving object

Solution Approach 1:

The system segments the radio functionality into two separate components: a low-power RF wakeup receiver that continuously monitors for wake signals, and a main connectivity radio that remains powered off until activated. This segmentation allows continuous monitoring capability while maintaining low power consumption, as each component is optimized for its specific function.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The RF wakeup receiver acts as an intermediary component between the external environment and the main connectivity radio. It continuously monitors for wake signals and only activates the main radio when necessary, thereby enabling fast response times without requiring the main radio to remain continuously powered on.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Use of energy by moving object

If the main connectivity radio is powered down to conserve power, then the power consumption is reduced, but the latency in establishing connection increases

Engineering Contradiction:

Improvepower consumptionVSAvoidlatency

Core Design Contradiction:

Use of energy by moving objectVSLoss of time

Solution Approach 1:

The RF wakeup receiver performs preliminary monitoring action continuously in the background while the main radio remains powered down. When a wake signal is detected, it immediately activates the main connectivity radio, thereby eliminating the latency that would otherwise occur from cold-starting the radio while maintaining low power consumption during idle periods.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If polling is used to turn on the main connectivity radio periodically, then the system can detect system-on signals, but significant latency occurs in establishing connection

Engineering Contradiction:

Improvesignal detectionVSAvoidconnection establishment latency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

Instead of having the node actively poll for system-on signals by periodically activating the main radio, the system inverts the approach by using a dedicated low-power RF wakeup receiver to continuously monitor for wake signals. This inversion transforms the node from an active poller to a passive receiver, enabling immediate response to wake signals without polling delays.

Inventive Principle:

Principle #13The other way round (Inversion)

4Productivity

If the main connectivity radio is activated frequently for monitoring, then the system responsiveness is improved, but the power consumption increases significantly

Engineering Contradiction:

Improvesystem responsivenessVSAvoidpower consumption

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The system applies local quality by using different radio components with different power characteristics for different functions. The RF wakeup receiver is optimized for continuous low-power operation, while the main connectivity radio is optimized for high-performance communication but remains powered off most of the time. This local optimization of component qualities enables high responsiveness when needed while maintaining low overall power consumption.

Inventive Principle:

Principle #3Local quality

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This solution significantly reduces power consumption and latency in turning on wireless nodes by using low-power RF components to monitor for wake signals, enabling continuous monitoring and faster system activation.

Implementation Method 1

The RF wakeup circuit is connected to the antenna and configured to monitor received radio-frequency energy for the at least one wakeup packet

Methodology Applied

Scientific EffectRadio-frequency energy detection: Electromagnetic Induction

Data Source

PatentUS11051248B2Radio-frequency wakeup for vehicle systems

Publication Date: 2021.06.29 ANALOG DEVICES INT UNLTD CO

AI summary

A system and method for monitoring components of a vehicle includes a manager and a wireless node. The manager is positioned on the vehicle and configured to wirelessly transmit a wake signal in response to an event. The wireless node positioned to monitor a component of the vehicle and includes an antenna, a wakeup circuit, and a node transceiver. The wakeup circuit is connected to the antenna and configured to monitor for the wake signal, and the node transceiver is configured to perform wireless communication with the manager. The wakeup circuit is configured to power on the node transceiver upon receipt of the wake signal.