Magnetic lock
By installing sensors and control circuits on the magnetic lock, the voltage output is adjusted according to the state changes of the lock plate, the problem of large power consumption of the magnetic lock is solved, and significant energy-saving effects and cost control are achieved.
Patent Information
- Application Number
- CN202410150254.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-02
- Publication Date
- 2025-08-05
AI Technical Summary
The power consumption of magnetic locks is large, and the prior art cannot effectively reduce it.
The magnetic lock lock body is equipped with a sensor and a control circuit that detects separation from the lock plate. The sensor is used to detect the state changes of the lock plate. The control circuit outputs a smaller static voltage when the lock plate is pressed, and outputs a rated voltage when the lock plate is separated to restore the lock force.
The energy-saving effect of magnetic locks is achieved, the power consumption is reduced by 90%, the cost increase is no more than 10 yuan, and the annual electricity bill is saved by 40 yuan.
Smart Images
Figure CN120425944A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the field of electronic locks, and specifically relates to a magnetic lock. Background Art
[0002] Magnetic locks are widely used. However, magnetic locks need to be continuously powered to maintain the magnetic force, while electric plug locks only require a large current when moving the lock tongue and only a small current to maintain normally. Obviously, the power consumption is greater than that of electric locks such as electric plug locks. Summary of the Invention
[0003] The technical problem to be solved by the present invention is to reduce the power consumption of magnetic locks.
[0004] The method is that the magnetic lock includes a lock body, an electromagnet core, an electromagnet coil, an indicator light, a freewheeling circuit, an interface, and a lock plate. The feature is that a sensor for detecting separation from the lock plate and a control circuit are installed on the magnetic lock body. When the lock plate presses the sensor, the control circuit outputs a small static voltage. At the moment when the lock plate separates, the control circuit immediately outputs the rated voltage to restore the locking force.
[0005] When closing the door, the magnetic lock is powered on. Since the lock plate of the magnetic lock is separated from the lock body, the control circuit of the magnetic lock outputs the rated voltage, and the magnetic lock is in the rated magnetic force, such as 250 kg. After the door is closed in place, the magnetic lock attracts the lock plate, and the lock plate presses the sensor. The sensor detects the pressing, and the control circuit outputs a small static voltage, generating a small static current in the coil, and the electromagnet of the magnetic lock generates a small static magnetic force, such as 25 kg, to keep the door closed. If it is detected that the lock plate separates instantaneously or has a separation tendency, the control circuit outputs the rated voltage to reach the rated current or the rated locking force.
[0006] Due to the inertia of the door, the acceleration of opening the door is related to the applied force. It takes hundreds of microseconds to several milliseconds to overcome the static locking force and make the door leave 1 mm, while it only takes a few microseconds to detect the departure or departure tendency. The control circuit immediately outputs the rated voltage. According to the inductance time constant of the coil, τ = L / R, the inductance is dozens of microhenries to hundreds of microhenries, the internal resistance of the inductance is dozens of ohms, and the time constant is a few microseconds to dozens of microseconds. And when the current in the coil increases to 1 / 2 of the rated current, the corresponding locking force is also half, such as 125 kg, which only takes a few microseconds to dozens of microseconds. That is, the locking force recovery speed is faster than the door opening speed, so it is still safe and reliable.
[0007] The above magnetic lock has the following advantages: The purpose of energy conservation can be achieved by using a simple circuit; moreover, the energy conservation can reach 90%. The cost increase is less than 10 yuan. Taking the 280 kg lock with the largest usage as an example, with a power of 6W and an 80% power saving, 40 degrees of electricity can be saved annually, saving 40 yuan of industrial electricity costs. Description of the Drawings
[0008] Figure 1 It is a control circuit diagram.
[0009] Component 1 is a pulse width modulation circuit, component 2 is an N-channel MOS transistor, component 3 is an electromechanical lock electromagnet coil, and component 4 is a separation sensor Specific implementation manner
[0010] The present invention will be further described below in conjunction with the accompanying drawings: When the locking piece is pressed tightly, the sensor of component 4 is in a closed state. The pulse width modulation circuit of component 1 outputs a high-level signal with a duty cycle of 10%, controlling the N-channel MOS transistor of component 2 to be turned on for 10% and turned off for 90%, and controlling the electromagnet coil of component 3 to generate a small average current; at the moment of separation or the trend of separation of the locking piece, the sensor of component 4 is in an open state, the resistor R3 in the pulse width modulation circuit of component 1 provides a high level, outputs a high level, controls the N-channel MOS transistor of component 2 to remain conducting, and the electromagnet coil of component 3 reaches the rated current.
[0011] The above-mentioned separation sensor is a switch contact flush with the surface of the electromechanical lock body. It conducts when the locking piece is pressed tightly and disconnects immediately at the moment of separation of the locking piece, then starts the control circuit to output the rated voltage and restore the rated locking force.
[0012] The above-mentioned separation trend sensor is a resistance strain gauge, whose resistance changes with pressure. When it has not left and the pressure on the strain gauge decreases, it outputs a disconnection, the control circuit outputs the rated voltage, and the rated locking force is obtained.
[0013] The above sensor signals can also be used as door status signals.
Claims
1. A magnetic lock comprising a lock body, an electromagnet core, an electromagnet coil, an indicator light, a freewheeling circuit, an interface, and a lock plate, characterized in that: A sensor for detecting separation from the lock plate and a control circuit are installed on the magnetic lock body. When the lock plate presses the sensor, the control circuit outputs a small static voltage. At the moment the lock plate separates, the control circuit immediately outputs the rated voltage to restore the locking force.
2. According to claim 1, a magnetic lock, wherein the control circuit includes a pulse width modulation control circuit and a MOS transistor; when the locking plate presses against the sensor, the MOS transistor is at a smaller on-duty cycle, and the electromagnet coil generates a smaller average current; when the locking plate is separated from the sensor, the MOS transistor of the control circuit remains on, and the electromagnet coil reaches a rated current.
3. According to claim 1, a magnetic lock, wherein the sensor is characterized in that: The switch contacts are flush with the surface of the electric lock body. They are conductive when the lock piece is pressed tightly and disconnected when the lock piece is separated.