Bus Node Voltage Supply Stabilization via Dynamic Resistance
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Solution Overview
Problem
Existing devices for providing supply voltage in bus nodes of bus networks, such as EIB networks, face challenges in maintaining stability during load changes and ensuring energy balance between active and compensation pulses, often resulting in communication disruptions or error generation due to voltage damping by classic power supplies.
Innovation Solution
A device with a current source connected in series with capacitance, featuring a first control module for stabilizing the operating point independently of bus signals and load changes, and a second control module that dynamically adjusts the current source's resistance using MOSFETs and polarity-specific valves to minimize damping of compensation pulses, allowing for stable voltage supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a classic power supply with linear regulator is used, then the supply voltage is stabilized, but the compensation pulses are damped considerably, preventing energy balance on the bus
Solution Approach 1:
The patent applies dynamics by making the coupling circuit's resistance variable rather than fixed. The coupling circuit dynamically adjusts its resistance based on the bus signal state: presenting low resistance during compensation pulses to minimize damping, and high resistance during active pulses to block them from the power supply. This dynamic adaptation resolves the contradiction between voltage stability and energy balance.
Solution Approach 2:
The invention changes the resistance parameter of the coupling circuit based on the operating condition. By controlling the coupling circuit to have different resistance values for different signal types (active pulses vs. compensation pulses), the system achieves both voltage stabilization and energy balance without the limitations of a fixed-resistance linear regulator.
2Reliability
If the coupling circuit resistance is kept low for stable voltage supply, then load fluctuations can be absorbed, but active pulses are blocked and communication is disrupted
Solution Approach 1:
The coupling circuit dynamically changes its resistance characteristic based on the incoming signal type. During active pulses, it presents high resistance to block them from the power supply and prevent communication disruptions. During compensation pulses, it presents low resistance to allow voltage stabilization and load fluctuation absorption. This time-dependent resistance adaptation resolves the contradiction.
Solution Approach 2:
The coupling circuit exhibits different resistance qualities for different signal types locally in time. Rather than having a uniform resistance characteristic, the circuit is designed to provide high resistance for active pulses and low resistance for compensation pulses, optimizing performance for each signal type independently.
3Ease of manufacture
If bipolar transistors are used in the coupling circuit, then the circuit can be implemented, but load fluctuations cannot be sufficiently absorbed
Solution Approach 1:
The patent changes the resistance parameter of the coupling circuit dynamically to optimize load fluctuation absorption. By controlling the coupling circuit to present low resistance during compensation pulses, the system can sufficiently absorb load fluctuations, overcoming the limitation of bipolar transistor-based implementations with fixed resistance characteristics.
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
The solution ensures stable voltage supply during load changes, maintains energy balance by reducing dynamic resistance after active pulses, and meets the requirements of the Konnex Manual, Version 2.0, ensuring reliable communication and operation in bus networks.
Implementation Method 1
a capacitance connected in series with a power source, whose series connection is connected directly or indirectly to a bus with bus conductors that are at different potentials
Implementation Method 2
at least two MOSFETs, in particular n-channel MOSFETs, are provided as the current source
Data Source
Figure 1(a)~2
Figure 3~4
Figure 5~6
AI summary
A device for providing a loadable supply voltage in a bus node of a bus network, in particular in a bus node of an EIB network, having a current source (M1) which is connected in series with a capacitance (C3) across which the supply voltage (U) is tapped, wherein the series circuit (M1, C3) is directly or indirectly connected to a bus having bus conductors (Bus+, Bus-) at different potentials, is characterized by a first control module (A) which stabilizes the operating point of the current source (M1) independently of bus signals on the bus conductors (Bus+, Bus-) and loads or load changes of the supply voltage (U); and a second control module (B) which adapts the operating point of the current source (M1) in response to a bus signal on the bus conductors (Bus+, Bus-). A method for providing a loadable supply voltage is also disclosed.