PoDL Powered Device Active Rectifier Bridge Shunting Switch
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Solution Overview
Problem
Power over Data Lines (PoDL) systems with a full-bridge rectifier for DC polarity correction fail to operate during the classification phase, as the rectifier blocks the current path needed for the PD logic circuit to communicate with the PSE via the shunting switch.
Innovation Solution
Incorporating active switches, such as MOSFETs, into the full-bridge rectifier, controlled by the PD logic circuit to create a completed circuit for the shunting switch during the classification phase, allowing communication between the PD and PSE regardless of the polarity supplied by the PSE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a full-bridge rectifier is used for DC polarity correction, then polarity correction capability is improved, but the control line current path is blocked during classification phase
Solution Approach 1:
The patent applies the Dynamics principle by making the rectifier bridges dynamic and controllable rather than static. MOSFETs are used as controllable switches in place of fixed diodes, allowing the rectifier to be dynamically enabled or disabled. During classification phase, the second rectifier bridge is disabled (MOSFETs off) to allow control line current to flow through the shunting switch. During normal operation, the appropriate rectifier bridge is activated based on polarity detection, achieving both polarity correction and communication functionality.
2Device complexity
If passive diodes are used in the rectifier bridge, then circuit simplicity is improved, but control over current path during classification phase is lost
Solution Approach 1:
The patent applies the Mechanics substitution principle by replacing passive diodes with active MOSFET switches in the rectifier bridge. This substitution transforms the circuit from a passive, uncontrollable configuration to an active, controllable one. The MOSFETs can be precisely controlled by the PD logic circuit to enable or disable current flow through the rectifier bridge, allowing the system to differentiate between classification phase (MOSFETs off, allowing control current) and normal operation (MOSFETs on, enabling polarity correction).
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
Enables the shunting switch to be controlled during the classification phase, allowing the PD to convey classification information to the PSE without blocking the control line current, while ensuring proper polarity correction during normal operation.
Implementation Method 1
Incorporating active switches, such as MOSFETs, into the full-bridge rectifier, controlled by the PD logic circuit to create a completed circuit for the shunting switch during the classification phase
Implementation Method 2
full-bridge rectifier for DC polarity correction
Data Source
AI summary
A Power over Data Lines (PoDL) system includes a Powered Device (PD) logic circuit for conveying classification information to Power Sourcing Equipment (PSE), during a classification phase, via a wire pair. The logic circuit controls a shunting switch for selectively shunting the wires together for communication with the PSE during the classification phase. A holdup capacitor supplies power to the logic circuit during the classification phase. The logic circuit controls a full-bridge rectifier to ensure the capacitor is charged with a proper polarity voltage and to ensure a proper polarity voltage is supplied to a PD load. The PD has a controller for controlling the rectifier to cause a current path between terminals of the capacitor, via the shunting switch, when the shunting switch is to be turned on.