一种电磁门锁的匹配器接近识别电路和电磁门锁
By combining a high-voltage power supply control unit and a low-voltage power-on detection control unit, the problems of unstable recognition accuracy and high cost of Hall elements and permanent magnets in electromagnetic door locks are solved, achieving higher accuracy proximity detection and reducing production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN BAYTEST TECH CO LTD
- Filing Date
- 2025-07-23
- Publication Date
- 2026-07-17
AI Technical Summary
In existing electromagnetic door locks, the Hall element has poor sensitivity consistency and the permanent magnet has inconsistent magnetism, resulting in unstable recognition accuracy and high production cost. Furthermore, the permanent magnet may attract environmental metal impurities, affecting the overall quality of the machine.
By employing a high-voltage power supply control unit and a low-voltage power-on detection control unit, the power supply status and voltage detection of the electromagnet are controlled to reflect its proximity to the matching device, avoiding the use of Hall effect devices and permanent magnets, thus improving detection accuracy and reducing production costs.
It improves the accuracy of proximity detection and the overall quality of the device, reduces production costs, avoids the inconvenience of Hall effect devices, and enhances product stability and performance.
Smart Images
Figure CN224514946U_ABST
Abstract
Claims
1. A matcher proximity identification circuit of an electromagnetic door lock, characterized by, include: A high-voltage power supply control unit (100) is used to control the high-voltage power supply to the electromagnet; A high-voltage power supply control port is connected to the high-voltage power supply control unit (100) and is used to receive high-voltage power supply control signals to the electromagnet; The low voltage power-on detection and control unit (200) is used to control the low voltage power supply to energize the electromagnet and simultaneously detect the voltage at the electromagnet. The low-voltage energization control port is connected to the low-voltage energization detection and control unit (200) and is used to receive the low-voltage energization control signal for the electromagnet. The detection signal port is connected to the low voltage power-on detection control unit (200) and is used to obtain the voltage at the electromagnet as a detection signal.
2. The electromagnetic door lock's matcher proximity identification circuit according to claim 1, characterized in that, The high-voltage power supply control unit (100) includes: The positive terminal of the power supply is connected to the control unit, which is connected between the first end of the electromagnet (L2) and the positive terminal of the high voltage power supply, and is used to control the connection or disconnection of the first end of the electromagnet (L2) and the positive terminal of the high voltage power supply. The power supply grounding control unit is connected between the second end of the electromagnet (L2) and the grounding end, and is used to control the connection or disconnection of the second end of the electromagnet (L2) and the grounding end; The positive terminal connection control unit and the grounding control unit for electromagnet power supply are synchronously connected or disconnected according to the high-voltage power supply control signal for the electromagnet.
3. The electromagnetic door lock's matcher proximity identification circuit according to claim 2, wherein, The positive terminal connection control unit includes a PMOS transistor (Q5), a first NMOS transistor (Q7), a first resistor (R21), a second resistor (R27), a third resistor (R29), and a fourth resistor (R30). The positive terminal of the high-voltage power supply is connected to the source of the PMOS transistor (Q5) and to the gate of the PMOS transistor (Q5) via the first resistor (R21). The drain of the PMOS transistor (Q5) is connected to the first terminal of the electromagnet (L2). The gate of the PMOS transistor (Q5) is connected to the drain of the first NMOS transistor (Q7) via the second resistor (R27). The source of the first NMOS transistor (Q7) is connected to ground. The gate of the first NMOS transistor (Q7) is grounded via the fourth resistor (R30) and connected to the high-voltage power supply control port via the third resistor (R29).
4. The electromagnetic door lock's matcher proximity identification circuit according to claim 3, wherein, The pull-in power supply grounding control unit includes a second NMOS transistor (Q9), the second end of the electromagnet (L2) is connected to the drain of the second NMOS transistor (Q9), the source of the second NMOS transistor (Q9) is grounded, and the gate of the second NMOS transistor (Q9) is connected to the gate of the first NMOS transistor (Q7).
5. The electromagnetic door lock's matcher proximity identification circuit according to claim 1, wherein, The low voltage power-on detection and control unit (200) includes: The anode of the first diode (D11) is connected to the positive terminal of the low-voltage power supply, and the cathode is connected to the first terminal of the electromagnet (L2). The freewheeling diode (D13) has its cathode connected to the first terminal of the electromagnet (L2) and its anode connected to the second terminal of the electromagnet (L2). The detection resistor (R34) is connected between the second terminal of the electromagnet (L2) and the ground terminal to detect the voltage at the second terminal of the electromagnet (L2). The second terminal of the electromagnet (L2) is connected to the detection signal port. The detection power supply control unit is connected between the second end of the electromagnet (L2) and the grounding end, and is used to control the connection or disconnection of the second end of the electromagnet (L2) and the grounding end.
6. The electromagnetic door lock's matcher proximity identification circuit according to claim 5, wherein, The detection power supply control unit includes a third NMOS transistor (Q10) and a fifth resistor (R36). The drain of the third NMOS transistor (Q10) is connected to the second terminal of the electromagnet (L2), the source of the third NMOS transistor (Q10) is connected to the ground terminal, and the gate of the third NMOS transistor (Q10) is connected to the low voltage power-on control port and connected to the ground terminal through the fifth resistor (R36).
7. The electromagnetic door lock's matcher proximity identification circuit according to claim 1, wherein, Also includes: The detection result output unit (300) is connected to the detection signal port and is used to convert the acquired detection signal into a high-level / low-level signal; The detection result port is connected to the detection result output unit (300) and is used to output the detection result in the form of a high-level / low-level signal.
8. The electromagnetic door lock's matcher proximity identification circuit according to claim 7, wherein, The detection result output unit (300) includes a comparator (U7), a sixth resistor (R36), a seventh resistor (R35), an eighth resistor (R34), and a ninth resistor (R37). The detection signal port is connected to the positive input terminal of the comparator (U7) via the sixth resistor (R36). The seventh resistor (R35) is connected in parallel between the positive input terminal and the output terminal of the comparator (U7). The output terminal of the comparator (U7) is connected to the detection result port. The positive terminal of the low voltage power supply is connected to the negative input terminal of the comparator (U7) via the eighth resistor (R34). The negative input terminal of the comparator (U7) is connected to ground via the ninth resistor (R37).
9. The electromagnetic door lock's matcher proximity identification circuit according to claim 8, wherein, The comparator (U7) is a hysteresis comparator.
10. An electromagnetic door lock, comprising an electric lock body and a matching device, wherein the electric lock body is provided with an electromagnet and a matching device proximity recognition circuit for the electromagnetic door lock as described in any one of claims 1 to 9.