Choke Circuit Inductor Boost Topology for KNX Bus Power
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Solution Overview
Problem
Conventional choke circuits in KNX TP bus systems are expensive, bulky, and complex, leading to reduced power efficiency and increased DC resistance, which affects the reliability and efficiency of data transmission.
Innovation Solution
An improved choke circuit incorporating an inductor with reduced inductance and a boost circuit that assists in preserving data transmission integrity by temporarily increasing the reference potential during data transmission, allowing for correct decoding of data bits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional common-mode choke circuit is used in the bus power supply, then data transmission can be enabled, but the choke circuit becomes expensive, bulky, and complex with increased DC resistance and reduced power efficiency
Solution Approach 1:
The patent extracts the essential function of the common-mode choke (enabling data transmission) and implements it through a simplified circuit configuration using an inductor L11 and boost circuit instead of a complex common-mode choke structure, thereby reducing device complexity while maintaining the core functionality
Solution Approach 2:
The invention replaces the expensive conventional common-mode choke with a more cost-effective inductor and boost circuit combination, achieving the same data transmission enabling function at lower cost and with reduced complexity
2Reliability
If a conventional common-mode choke circuit is used in the bus power supply, then data transmission can be enabled, but power efficiency is reduced and DC resistance increases
Solution Approach 1:
The patent changes the circuit configuration parameters by replacing the common-mode choke with an inductor and boost circuit arrangement, which has lower DC resistance and improved power efficiency while still enabling data transmission functionality
3Loss of energy
If the inductance value of the choke circuit is reduced, then power efficiency is improved and complexity is reduced, but data transmission integrity is compromised
Solution Approach 1:
The patent introduces a boost circuit as an intermediary component that works in conjunction with the inductor to maintain the necessary voltage conditions for data transmission integrity, even when using reduced inductance values that improve power efficiency
Solution Approach 2:
The invention creates a composite circuit solution combining an inductor with reduced inductance and a boost circuit, where the combination achieves both improved power efficiency and maintained data transmission integrity that neither component could achieve alone
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 reduces the inductance value of the choke circuit while maintaining data transmission integrity, overcoming the limitations of conventional common-mode choke elements by enhancing power efficiency and reducing assembly complexity.
Implementation Method 1
The inductor L11 is connected between a first input terminal DC+ and a first output terminal Bus+ and is configured to block high-frequency alternating currents from being passed on from the bus to the DC power supply
Implementation Method 2
a boost circuit connected between a second input terminal DC- and a second output terminal Bus- for increasing the voltage level output by the second output terminal Bus- by a predefined voltage level
Data Source
Figure 1a
Figure 1b
Figure 2
AI summary
The invention relates to a choke circuit (220) and a bus power supply incorporating same. Such a coil choke circuit (220) includes an inductor (L11) connected between a first input terminal (29V) and a first output terminal (Bus+), a boost circuit (222) connected between a second input terminal (0V) and a second output terminal (Bus-) for increasing the voltage level that is output by the second output terminal (Bus-). A switching element (T12) is connected in parallel to the boost circuit (222) for bypassing the boost circuit (222). Additionally, a comparator (CMP) is connected between the first input terminal (29V) and the first output terminal (Bus+) for detecting a potential difference across the inductor (L11); wherein in case the comparator (CMP) detects a potential difference higher than a threshold, the switching element (T12) is controlled to be in an OFF state; and in case the comparator (CMP) detects a potential difference lower than or equal to the threshold, the switching element (T12) is controlled to be in an ON state.