Electronic Lock Power Failure Control Circuit
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Solution Overview
Problem
Electronic locks face challenges in maintaining a desired locked or unlocked state during power failures and voltage reductions, leading to potential security breaches and operational disruptions.
Innovation Solution
An electronic lock system with a microcontroller, power monitor circuit, and auxiliary supercapacitor power supply that detects power failures, switches to auxiliary power, and controls the lock actuator to set a desired state, ensuring secure operation during power outages and restoring normal function when power returns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electronic lock operates during power failures, then the lock can maintain its function, but the reliability deteriorates due to potential security breaches and operational disruptions
Solution Approach 1:
The power monitor circuit continuously monitors the primary power supply voltage before a complete power failure occurs. When the voltage drops below a predetermined threshold, the system proactively switches to the auxiliary supercapacitor power supply and executes the power failure control program, ensuring uninterrupted lock operation and maintaining reliability during power transitions.
Solution Approach 2:
The auxiliary supercapacitor power supply acts as an intermediary power source between the primary power supply and the lock actuator. When the primary power fails, the supercapacitor provides bridging power to maintain lock operation, preventing direct power loss impact and ensuring continuous secure operation during the power failure period.
2Object-affected harmful factors
If the lock fails to a locked state during power failure, then security is maintained, but the ease of operation deteriorates as users cannot exit the secure area
Solution Approach 1:
The lock actuator is designed with dynamic control capabilities that allow it to respond differently to power failure conditions based on operational context. During a power failure, the microcontroller can dynamically control the actuator to either maintain the locked state for security or facilitate unlocking for emergency exit, providing flexible operation rather than a fixed failure state.
Solution Approach 2:
The system changes the operational parameters of the lock actuator during power failure by switching to auxiliary supercapacitor power. This parameter change enables the actuator to remain controllable and responsive, allowing authorized users to exit the secure area while maintaining security controls, rather than failing to a static locked state.
3Ease of operation
If the lock fails to an unlocked state during power failure, then emergency access is facilitated, but the security deteriorates as unauthorized entry may occur
Solution Approach 1:
The power monitor circuit provides continuous feedback on the primary power supply status. When power failure is detected, the system activates the auxiliary supercapacitor power supply and enters a controlled power failure operation mode. This feedback mechanism ensures that the lock remains in a known, controllable state rather than failing to an unpredictable unlocked state, maintaining security while enabling emergency access when needed.
4Productivity
If the lock continues normal operations during power failure, then productivity is maintained, but the reliability worsens due to memory corruption and communication disruptions
Solution Approach 1:
When the power monitor detects voltage drop below the threshold, the system proactively switches to auxiliary power and executes the power failure control program before memory corruption or communication disruptions can occur. This preliminary action preserves data integrity and prevents operational errors while maintaining essential lock functions during the power failure period.
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 effectively manages power failures by maintaining the lock in a secure state, preventing unauthorized access and ensuring smooth operation upon power restoration, thus enhancing security and reliability.
Implementation Method 1
an auxiliary supercapacitor power supply that detects power failures
Implementation Method 2
power monitor circuit, and auxiliary supercapacitor power supply that detects power failures
Data Source
AI summary
An electronic lock with power failure control circuit includes a lock mechanism having a latchbolt movable between extended and retracted positions and an electrically powered lock actuator to lock and unlock the latchbolt. The power failure control circuit includes a microcontroller and the lock is connected to a primary power source and an auxiliary power source, preferably supercapacitors and charger that can be turned on by the microcontroller and off when the charger signals a full charge. A power monitor circuit detects low voltage on the primary power supply and sets a power failure interrupt causing the microcontroller to execute power failure instructions that control the actuator so that the lock is placed into a desired locked or unlocked final state during the power failure. Upon detection of the return of good power, the system resets the lock.