Active Inductor Assemblies for Stable Data-Over-Power Signaling
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Solution Overview
Problem
Magnetic devices used in data over power systems are large, heavy, and expensive, while active inductors, which are smaller and lighter, suffer from undesired voltage variations, susceptibility to leakage current, and limited data signal magnitude, leading to inefficiencies and signal integrity issues.
Innovation Solution
Active inductor assemblies that regulate steady-state voltage drop and emulate inductance, using transistors and control circuitry to maintain precise voltage regulation and boost inductance during signal transients, thereby ensuring reliable data transmission and energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic devices are used in data over power systems, then signal integrity is maintained, but the system becomes large, heavy, and expensive
Solution Approach 1:
The patent replaces traditional magnetic inductors (mechanical/electromagnetic components) with active inductor circuits composed of transistors, capacitors, and resistors. This substitution eliminates the need for bulky magnetic cores and windings while maintaining the inductive function through electronic circuitry, thereby reducing weight and cost while preserving signal integrity
Solution Approach 2:
The active inductor circuit replicates the electrical characteristics of a magnetic inductor by using an equivalent circuit model (typically a transistor with associated capacitors and resistors) that mimics the inductive behavior. This copying approach allows the system to achieve the same functional performance without the physical constraints of magnetic components
2Weight of stationary object
If active inductors are used to reduce size, then device weight decreases, but voltage variations and leakage current increase
Solution Approach 1:
The active inductor incorporates feedback mechanisms where the output voltage or current is monitored and fed back to the control circuitry. This feedback loop continuously adjusts the operating parameters to maintain stable voltage levels and compensate for variations, thereby improving voltage stability while retaining the weight advantages of active inductors
Solution Approach 2:
The active inductor uses dynamic control elements (transistors with variable resistance) that can adjust their characteristics in real-time based on operating conditions. This dynamic adaptation allows the circuit to maintain optimal performance across varying loads and voltage conditions, reducing voltage variations and improving overall reliability
3Weight of stationary object
If active inductors are used to reduce size, then device weight decreases, but susceptibility to leakage current increases
Solution Approach 1:
The patent introduces intermediary components such as protection diodes, clamp circuits, or isolation elements between the active inductor and sensitive circuitry. These intermediaries act as buffers that prevent leakage current from reaching critical components, thereby reducing susceptibility to leakage current while maintaining the compact size of active inductors
4Reliability
If large voltage drops are used in active inductors, then inductance value increases, but power dissipation increases
Solution Approach 1:
The patent employs parameter changes by using high-gain transistors and optimized capacitor values to achieve high inductance values with small voltage drops. By changing the operating parameters (transconductance, capacitance) rather than relying on large voltage drops, the circuit maintains high inductance while minimizing power dissipation
Solution Approach 2:
The active inductor dynamically adjusts its operating point to optimize the trade-off between inductance value and power dissipation. The control circuitry modulates the transistor operating conditions to achieve the required inductance with minimal voltage drop, thereby reducing power loss while maintaining reliable inductance values
Data Source
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AI summary
An active inductor assembly for a data over power (DoP) system includes a first active inductor and a second active inductor. The first active inductor includes a first pass element and first control circuitry. The first control circuitry is configured to control the first pass element such that (i) the first pass element emulates a first inductor in response to changing voltage across the first pass element and (ii) the first pass element regulates a voltage drop across the first pass element during steady-state operation. The second active inductor includes a second pass element and second control circuitry. The second control circuitry is configured to control the second pass element such that (i) the second pass element emulates a second inductor in response to changing voltage across the second pass element and (ii) the second pass element regulates a voltage drop across the second pass element during steady-state operation.