Low-Profile Electromagnetic Lock with Integrated Motion Detection
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Solution Overview
Problem
Existing electromagnetic lock systems for access control face issues such as protrusion into door openings, voltage compatibility challenges, and inadequate passive motion detection, leading to safety and installation complexities.
Innovation Solution
A low-profile electromagnetic lock module with integrated passive motion detection and a microcontroller for automated voltage selection and relock functions, along with a camera for visual identification, addressing the issues of protrusion, voltage compatibility, and detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional electromagnetic locks are used, then locking function is provided, but the device protrudes into door opening creating safety and aesthetic issues
Solution Approach 1:
The electromagnetic lock is redesigned with a low-profile configuration that extends horizontally along the door frame rather than protruding vertically into the door opening. This dimensional reorientation eliminates the safety hazard of protrusion while maintaining the electromagnetic locking function between the electromagnet and keeper plate.
2Adaptability or versatility
If voltage selection is made manually with DPDT switch, then voltage compatibility is achieved, but installation complexity and potential for errors increase
Solution Approach 1:
The electromagnetic lock incorporates a microcontroller that automatically detects the input voltage level (12V or 24V DC) and configures the coil connections accordingly without requiring manual intervention. The system self-adjusts by monitoring voltage characteristics and automatically switching between series and parallel coil configurations, eliminating the need for installers to manually set DPDT switches and reducing installation errors.
Solution Approach 2:
The system dynamically changes the electrical parameters of the coil circuit based on detected voltage levels. When 12V is detected, the microcontroller configures coils in parallel to maintain sufficient current; when 24V is detected, it switches to series configuration to prevent excessive current. This automatic parameter adjustment enables universal voltage compatibility without complex manual setup.
3Reliability
If PIR motion detector is installed separately, then motion detection is provided, but detection accuracy and positioning become problematic
Solution Approach 1:
The passive infrared motion detector is integrated directly into the electromagnetic lock housing, combining two previously separate functions into a single unified device. The PIR detector is positioned within the lock assembly to optimally detect motion in the door vicinity, ensuring accurate detection for egress purposes while eliminating the need for separate mounting and alignment of a standalone PIR unit.
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 provides a universally applicable, easy-to-install electromagnetic lock system with improved safety and reduced installation complexities, ensuring accurate detection and secure operation across varying voltage conditions.
Implementation Method 1
an electromagnet is mounted on a door frame. When the electromagnet is energized and is in contact with the keeper plate with the door in a closed position, the keeper plate becomes an armature for the electromagnet, thus providing a mechanism for locking the door to the frame.
Implementation Method 2
the keeper plate becomes an armature for the electromagnet
Data Source
AI summary
An access control device including an electromagnetic lock module for selectively locking and unlocking a door in a door frame is provided. The access control device provides a lower profiled electromagnetic lock module to improve the aesthetics and functionality of the module, supports and integrates modern accessories such as CCTV, CCD cameras, passive motion detection with automatic background correction, digital notification display, automatic source voltage selection, door and lock status indicators, and ease of installation. The present invention further provides components and circuitry to enable connection of the electromagnetic control module to 12 or 24 volts DC or to an unfiltered rectified AC power supply.