PoE Charging Circuit Voltage Detection Switch Control
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Solution Overview
Problem
In power over Ethernet environments, devices continue to receive full power supply even after their chargeable power storage devices are fully charged, leading to unnecessary power consumption due to the existing standards' inability to detect and stop power delivery once the device is fully charged.
Innovation Solution
A charging circuit with a sensing circuit and voltage detection circuit is used to interrupt or allow power supply to a power storage device based on its voltage state, using a switch in series with a resistor to communicate with the Power Sourcing Equipment (PSE) and prevent unnecessary power consumption by simulating the removal of the sensing resistor when the device is fully charged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the PSE continues to supply full voltage after the power storage device is fully charged, then the device remains connected and operational, but unnecessary power consumption occurs
Solution Approach 1:
The voltage detection circuit continuously monitors the voltage of the power storage device and provides feedback to the switch control circuit. When the voltage reaches the first threshold indicating full charge, the feedback signal triggers the switch to open, automatically stopping power supply. This closed-loop feedback mechanism resolves the contradiction by enabling the system to autonomously adjust power supply based on real-time battery status.
Solution Approach 2:
The charging circuit performs self-service by using its own voltage detection capability to determine when to stop charging. The system monitors its own power storage device's voltage level and autonomously controls the power supply without external intervention. This self-regulating mechanism eliminates the need for external control while preventing energy waste.
2Loss of energy
If a voltage detection circuit and switch control circuit are added to detect power storage device voltage and control power supply, then unnecessary power consumption is reduced, but device complexity increases
Solution Approach 1:
The voltage detection circuit serves multiple functions: it monitors the power storage device voltage, determines charge status, and provides control signals for power supply interruption. By making the voltage detection circuit multi-functional, the patent reduces the need for separate dedicated circuits for each function, thereby minimizing the increase in device complexity while achieving energy savings.
Solution Approach 2:
The patent combines the voltage detection function, control logic, and power supply switching control into an integrated charging circuit. The voltage detection circuit and switch control circuit work as a unified system where the detection results directly control the power supply state. This merging of functions reduces the overall complexity compared to having separate independent systems for detection and control.
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 effectively stops power delivery to the device once it is fully charged, reducing unnecessary power consumption and optimizing energy usage in power over Ethernet systems.
Implementation Method 1
a voltage detection circuit that detects a voltage of the power storage device
Implementation Method 2
a sensing circuit including a resistor and a switch that is disposed in series with the resistor
Data Source
AI summary
A charging circuit and method for charging a power storage device in a power over Ethernet environment are necessary to prevent unnecessary power consumption. Power sourcing equipment continuously supplies power to a connected device after determining that the device is compatible. In order to prevent supply of power after a power storage device attains full charge, a charging circuit may include an interface for supplying electric power; a sensing circuit including a switch in series with a resistor; and a voltage detection circuit. The voltage detection circuit may communicate with the sensing circuit and may output a first signal that turns the switch OFF when the voltage of the power storage device is greater than or equal to a first voltage and may output a second signal that turns the switch ON when the voltage of the power storage device is less than or equal to a second voltage.