Power Management Device for DC-Powered Detection Energy Storage
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Solution Overview
Problem
DC-powered devices in non-accepting operational states consume unnecessary power during powered-device detection mode, leading to inefficiencies in power management.
Innovation Solution
A power management device that includes a power interface unit, voltage-level comparison stage, and power-acceptance decision unit to determine if a DC-powered device is in an accepting or non-accepting state, allowing energy storage during detection mode and controlled power delivery only when the device is in an accepting state, thereby reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a DC-powered device operates in powered-device detection mode to detect signature load, then the device can identify connected devices, but the DC-powered device consumes unnecessary power during non-accepting operational states
Solution Approach 1:
The power management device performs preliminary actions by detecting voltage levels and determining power acceptance criteria before the DC-powered device fully operates. The system detects voltage during powered-device detection mode, determines whether the device accepts power, and only then enables full power delivery, preventing unnecessary power consumption while maintaining detection capability
Solution Approach 2:
The power management device acts as an intermediary between the DC-power supply device and the DC-powered device. It monitors voltage levels, determines power acceptance criteria, and controls the switching unit to manage power flow, thereby enabling detection functionality while preventing unnecessary power consumption by the end device
2Reliability
If the power supply device continuously monitors for signature load in detection mode, then device connection detection is maintained, but energy is wasted when no device is ready to accept power
Solution Approach 1:
The system implements periodic detection through the switching unit that operates based on detected voltage levels and power acceptance criteria. The DC-powered device transitions between accepting and non-accepting operational states periodically, with the power management device monitoring voltage and enabling power delivery only when criteria are met, converting continuous monitoring into controlled periodic action
Solution Approach 2:
The power management device extracts and utilizes the voltage signal present during powered-device detection mode for determination purposes without requiring the DC-powered device to consume additional power. By taking out the detection function from the powered device itself and placing it in the power management device, unnecessary power consumption is eliminated while maintaining continuous detection capability
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
The solution effectively reduces DC-power consumption of DC-powered devices in non-accepting states by storing energy during detection mode and delivering it only when the device is in an accepting operational state, enhancing energy efficiency in Power over Ethernet systems.
Implementation Method 1
an energy storage unit that is configured to store electrical energy currently received from the external DC-power supply device via the power interface unit
Data Source
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AI summary
Power management (203) for controlling a delivery of a DC-power to a device (204) operable in an accepting operational state or a non-accepting operational state with respect to receiving the DC-power comprises: receiving DC input power; providing an indication that the DC-power supply device (202) operates in a powered-device detection mode and not in an powered-device operation mode; connecting, when the DC-power supply device (202) is in the powered-device detection mode, the power to an energy storage unit (212); storing electrical energy currently received; determining, whether the power-acceptance criterion is fulfilled and, in case it is fulfilled, providing an instruction to operate in the accepting operational state; connecting the energy storage unit (212) and a power interface unit (206) when the external DC-power supply device (202) is currently operating in the powered-device operation mode. This reduces DC-power consumption of a DC-powered device (204) by reducing or eliminating its DC-power consumption while it is operating in the non-accepting operational state.