Building ventilation system connection detection
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Solution Overview
Problem
Existing building ventilation systems, particularly smoke ventilation systems, face challenges in efficiently monitoring the integrity of the wired connection between electrical operator units and the central control unit using two wire installations, as existing solutions require additional wiring and are costly, making them unsuitable for smoke ventilation systems.
Innovation Solution
A building ventilation system utilizing two power supply wires to connect the central control unit to electrical operating units, where a test voltage lower than the operating voltage is applied to temporarily vary the load impedance of an end module, allowing the central control unit to detect the varying impedance pattern without activating the operating units, thus monitoring the connection without additional wiring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a further wire is provided to surveil the connection between electrical operator units and central control unit, then connection surveillance capability is improved, but device complexity and installation cost increase
Solution Approach 1:
The existing two power supply wires are made to serve dual purposes: both providing power to the electrical operator units and enabling connection surveillance. The central control unit injects test voltages through these same wires and detects impedance changes to monitor connection integrity, eliminating the need for separate surveillance wiring.
Solution Approach 2:
The electrical operator units themselves participate in the connection surveillance process by presenting their inherent impedance characteristics to the test voltage signals. The units' own electrical properties are utilized to indicate their operational status and connection integrity without requiring external surveillance components.
2Reliability
If test voltage is applied to detect connection status, then connection surveillance is enabled, but power consumption increases if operating units are activated
Solution Approach 1:
The central control unit varies the voltage parameter by applying different test voltage levels. By using test voltages below the operating voltage threshold, the system achieves connection detection without triggering the electrical operator units to activate, thereby minimizing power consumption during surveillance operations.
Solution Approach 2:
Instead of applying full operating voltage to test connections, the system uses partial voltage (test voltages below operating threshold) that is sufficient for detection purposes but insufficient to activate the operator units. This partial action achieves the surveillance goal while avoiding excessive power consumption.
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 efficient surveillance of the connection between the central control unit and electrical operating units, detects wire breaks independently of the operating position, and reduces power consumption during testing, making it suitable for smoke ventilation systems with only two power supply wires.
Implementation Method 1
the end module is configured to temporarily vary its load impedance with a predetermined pattern, and the central control unit is configured to detect the temporarily varying load impedance of the end module
Data Source
AI summary
A building ventilation system (1) comprising a central unit (2) and at least one electrical operating unit (3) for adjusting a movable member of a ventilation device, the central control unit (2) is connected to the at least one electrical operating unit (3) by two power supply wires (4) and configured to provide an operating voltage for operation of the at least one electrical operating unit (3) via the two power supply wires (4), wherein the power supply lines (4) are connected to an end module (5) and the central control unit (2) further is configured to provide a test voltage being lower than the operating voltage, wherein the end module (5) is configured to temporarily vary its load impedance with a predetermined pattern, and the central control unit (2) is configured to detect the temporarily varying load impedance of the end module.