Smart Lock Control Circuit for Dead Bolt State Detection
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Solution Overview
Problem
Current smart lock detection and control systems are not suitable for dead bolt locks, as they rely on touch switches that cannot be used in this type of lock, limiting their applicability.
Innovation Solution
A control circuit for smart locks incorporating optocoupler sensors, Hall sensors, and a main control chip to detect the locking and unlocking states of the lock body, allowing for the motor to rotate forward, reverse, or stop, and including additional components like power supply control, motor drive, clock, voice, indication, fingerprint, touch, Bluetooth, and low voltage detection units for enhanced functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch switches are used for position detection in smart locks, then the control system can detect lock body states, but this detection scheme cannot be applied to dead bolt locks, limiting adaptability
Solution Approach 1:
The patent replaces touch switch detection with a universal magnetic field detection system using Hall sensors that can detect the position of both ordinary lock bodies and dead bolt lock bodies. The Hall sensor detects the magnetic field changes caused by the motor's position, providing a universal detection mechanism that works across different lock types without requiring touch switches, thereby achieving multi-functionality and broad adaptability.
2Adaptability or versatility
If a single detection method is used for smart locks, then the system is simple, but it cannot accommodate both ordinary smart locks and dead bolt locks
Solution Approach 1:
The patent merges multiple detection approaches into a unified system: the Hall sensor detects motor position through magnetic field changes, while optocoupler sensors detect lock body state through light transmission changes. This combination of detection methods works universally for both ordinary smart locks and dead bolt locks, maintaining high measurement precision across different lock types without requiring separate detection systems.
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 control circuit enables effective state detection and control of both ordinary and dead bolt locks, offering strong applicability and practicality by allowing two locking modes for left or right open doors, improving the smart lock's functionality.
Implementation Method 1
the optocoupler sensor U21 is configured to detect whether state of the lock body is locked in position and a motor is retracted in position so as to form a first in-position signal, the optocoupler sensor U31 is configured to detect whether the state of the lock body is unlocked in position
Implementation Method 2
the Hall sensor VR1 is configured to detect whether the state of the lock body is unlocked in position so as to form an auxiliary signal
Data Source
AI summary
A circuit for a smart lock includes a state detection unit, a main control chip and a motor driving unit, the state detection unit includes optocoupler sensors U21, U31 and a Hall sensor; the optocoupler sensor U21 is configured to form a first in-position signal, the optocoupler sensor U31 is configured to form a second in-position signal, the Hall sensor is configured to detect whether the state of the lock body is unlocked in position so as to form an auxiliary signal; the main control chip is configured to output a control signal according to the first and second in-position signals and the auxiliary signal; and the motor driving unit is configured to drive the motor to rotate forward or reverse or stop rotating according to the control signal.