PoC Device Detection Circuit for Safe Coaxial Power Supply
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Solution Overview
Problem
Power over Coaxial (PoC) systems face challenges in determining the type of powered device and managing power supply to prevent damage, especially when devices are not powered up or are powered by external sources, and in detecting load disconnection accurately across different scenarios.
Innovation Solution
A power sourcing equipment with an input terminal, output terminal, switch, and device detection circuit that includes a data signal detection circuit and resistor/capacitor detection circuits to identify the type of powered device and control power supply, and a load detection circuit to determine load disconnection using different criteria based on the power sourcing scenario.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power sourcing equipment transmits power signal to the powered device via coaxial cable, then the powered device can be powered on, but the powered device may be damaged if it is already powered by an external power supply
Solution Approach 1:
The patent applies preliminary action by detecting the type of powered device before transmitting power signal. The detection circuit identifies whether the device is PoC-type or non-PoC-type, and whether it is powered on or off, before the power sourcing equipment activates power transmission, thereby preventing damage to devices already powered by external supplies.
Solution Approach 2:
The patent uses an intermediary detection circuit that analyzes electrical parameters (such as impedance, current draw, or voltage characteristics) to determine device type and power state. This intermediary detection layer mediates between the power sourcing equipment and the powered device, enabling safe power transmission decisions without direct interaction between the equipment and device.
2Reliability
If the power sourcing equipment detects device type and power state before transmitting power, then device damage is prevented, but the system complexity increases
Solution Approach 1:
The patent segments the detection function into distinct components: a detection circuit that identifies device type and power state, and a control mechanism that decides power transmission. This segmentation allows the system to perform multiple detection tasks (device type identification, power state detection) through modular circuitry, reducing overall system complexity while maintaining comprehensive safety checks.
Solution Approach 2:
The detection circuit is designed with multi-functionality to perform multiple detection tasks using a unified approach. The same detection circuitry analyzes electrical parameters to determine both device type (PoC vs. non-PoC) and power state (powered on vs. off), eliminating the need for separate dedicated circuits for each detection function and thereby reducing system complexity.
3Adaptability or versatility
If the power sourcing equipment changes operation based on load changes of the powered device, then the system adapts to device needs, but the control complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where the detection circuit continuously monitors electrical parameters of the powered device, and the power sourcing equipment adjusts its operation based on this feedback. When load changes are detected (such as device startup, shutdown, or power state changes), the system automatically modifies power transmission accordingly, providing adaptability through continuous monitoring and adjustment without requiring complex manual control.
Data Source
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AI summary
A power sourcing equipment is provided. The power sourcing equipment may include an input terminal, an output terminal, a switch, and a device detection circuit. The input terminal may receive a power signal. The output terminal may be electrically coupled to a powered device via a coaxial cable, which transmits the power signal from the power sourcing equipment to the powered device or a data signal from the powered device to the power sourcing equipment. The switch may control an electrical connection between the input and output terminal (s). The device detection circuit may detect whether the data signal is being transmitted from the powered device to the power sourcing equipment. If the data signal is not being transmitted from the powered device to the power sourcing equipment, the device detection circuit may control an operation of the switch based on an electrical parameter associated with the powered device.