HDMI Differential Interface Power Recovery for Peripheral Circuits
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Solution Overview
Problem
In HDMI transmission systems, power supplied to peripheral circuits from an external source is inefficient as it wastes energy in setting DC conditions of differential drivers, which could be tapped to power these circuits within the transmitter.
Innovation Solution
Harnessing the wasted power from the differential driver termination resistors at the receiver to supply peripheral circuits in the HDMI transmitter through a regulated and optionally boosted power supply, utilizing current and voltage regulation circuitry to ensure compatibility with required voltage and current needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If power is supplied to peripheral circuits from an external source, then the transmitter can operate with adequate power, but energy is wasted in setting DC conditions of differential drivers
Solution Approach 1:
The patent recovers the wasted power that is dissipated in setting up DC conditions of differential drivers. By capturing the voltage drop across the termination resistors and rectifying it, the system recovers energy that would otherwise be lost, converting it into usable power for peripheral circuits.
Solution Approach 2:
The differential drivers themselves generate the power needed for peripheral circuits through their normal operation. The wasted power from driver operation is harvested and used to supply peripheral circuits, making the system self-sufficient without requiring additional external power connections.
2Reliability
If termination resistors are used at the receiver to enable signal swing, then signal transmission works correctly, but power is consumed and wasted in the process
Solution Approach 1:
The patent converts the harmful effect of power dissipation at the termination resistors into a beneficial resource. The voltage drop across the termination resistors, which represents wasted energy, is captured and rectified to provide power for peripheral circuits, turning a loss into a useful resource.
3Stability of the object's composition
If differential drivers draw constant DC current, then signal swing is maintained per HDMI specification, but power is continuously consumed
Solution Approach 1:
The continuous power consumption of differential drivers is converted into a useful resource. The constant DC current drawn by the drivers creates a steady voltage drop across the termination resistors, which is rectified to provide stable power for peripheral circuits, transforming continuous energy loss into continuous useful power supply.
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
Reduces total system power consumption by utilizing otherwise wasted energy, allowing peripheral circuits to be powered directly from the transmitter without increasing power drain on the receiver, while enabling operation with higher voltage requirements through voltage boosting.
Implementation Method 1
The termination resistors R0 and R1 connected to power supply at the receiver, or sink side termination 120. The transmitter drivers draw current from the receiver power supply through the termination resistors
Implementation Method 2
a rectifier 205 to convert the recovered power into power for peripheral circuits
Implementation Method 3
a voltage regulator 210 to ensure that the converted power matches voltage requirements of the peripheral circuits
Implementation Method 4
current and voltage regulation circuitry to ensure compatibility with required voltage and current needs
Data Source
AI summary
An apparatus and method for supplying power to the peripheral circuits of a transmitter circuit, especially an HDMI transmitter circuit, is disclosed. In an HDMI transmitter, the termination resistors of the output driver are part of the receiver. DC power for the driver is supplied through these termination resistors. In prior art implementations, power supplied by the receiver circuit is wasted in the DC set-up circuit of the differential line driver. In various embodiments, this wasted power may be recovered from the remote termination to power selected peripheral circuits of the transmitter. The use of this wasted power may reduce the total system power consumption.