Hold Open Device Voltage Adaptive Current Control
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Solution Overview
Problem
Conventional hold-open systems for doors and windows are prone to overload when operated with supply voltages outside the nominal range, leading to potential coil burnout or insufficient locking torque.
Innovation Solution
An electronic control device measures the supply voltage and regulates the current through the coil to a predetermined value, ensuring consistent torque across a wide range of supply voltages, from 12V DC to 48V DC.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the supply voltage is increased to ensure sufficient holding torque, then the holding torque is improved, but the coil current increases causing overload and potential burnout
Solution Approach 1:
The system dynamically adjusts the coil current parameter based on the detected supply voltage. When voltage increases, the controller reduces current proportionally to maintain constant power and prevent overload. This parameter adaptation resolves the contradiction by decoupling holding torque from direct voltage proportionality, allowing sufficient torque while preventing coil damage through intelligent current limiting
Solution Approach 2:
The system implements a feedback control mechanism where the actual coil current is continuously monitored and compared against a reference value. The controller adjusts the current in real-time based on feedback signals, ensuring the coil operates within safe limits while maintaining adequate holding torque. This closed-loop control prevents overload conditions even when supply voltage fluctuates
2Use of energy by moving object
If the supply voltage is decreased to reduce power consumption, then energy use is reduced, but the holding torque becomes insufficient to lock the sash
Solution Approach 1:
The system optimizes the coil current parameter based on supply voltage conditions. When voltage is low, the controller adjusts current to maintain the precise amount needed for adequate holding torque without wasting energy on excessive current. This adaptive parameter control ensures minimum energy consumption while guaranteeing sufficient locking force across all voltage conditions
Solution Approach 2:
The system transitions from a static fixed-current design to a dynamic adaptive current control system. The controller continuously monitors voltage conditions and dynamically adjusts current delivery to match actual requirements. This dynamic approach ensures energy efficiency by delivering only the necessary current for adequate torque while preventing both under-performance and energy waste
3Ease of manufacture
If conventional hold-open systems are designed for a defined supply voltage, then the system is simple to manufacture, but it cannot operate reliably with varying supply voltages
Solution Approach 1:
The system incorporates a universal voltage adaptation capability that allows the same hold-open device to operate reliably across multiple voltage conditions (12V, 24V, 48V DC). The controller detects supply voltage and automatically configures operation parameters, making the system universally compatible with different building electrical networks while maintaining consistent performance and reliability across all operating conditions
Solution Approach 2:
The system performs preliminary voltage detection and parameter configuration when first powered on, before normal operation begins. The controller pre-adjusts current limits and operating parameters based on the detected supply voltage level, ensuring optimal and safe operation from the start. This preliminary setup action prevents operational issues and ensures reliability without requiring complex real-time adjustments during normal operation
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 system reliably maintains a standard-compliant holding function by ensuring a constant current through the coil, regardless of supply voltage fluctuations, thus preventing coil overload and ensuring proper locking performance.
Implementation Method 1
an energizable coil (13) which, when energized, is intended to block automatic closing of the leaf by a drive connected to the leaf
Data Source
Figure 1
AI summary
The invention relates to a hold-open device for holding an open sash of a door, window, or the like, comprising an energized coil designed to block automatic closing of the sash by a drive connected to the sash when energized, a supply voltage input for the coil, and an electronic control unit. The electronic control unit is configured to measure the supply voltage applied to the supply voltage input upon activation and to regulate the current flowing through the coil to a predetermined value. The current regulation is achieved by measuring the current flowing through the coil, and the starting value of the current regulation is determined based on the measured supply voltage.