Control circuit supporting lock short circuit protection

Abstract

The utility model discloses a control circuit supporting lock short-circuit protection in the technical field of electromagnetic lock detection, the control circuit supporting lock short-circuit protection comprises a lock short-circuit protection circuit and a lock short-circuit detection circuit, the lock short-circuit protection circuit is connected with 9-24V power supply voltage, after voltage stabilization, 15V is fixedly output, and the lock short-circuit detection circuit is connected with the lock short-circuit protection circuit. The lock short-circuit detection circuit is connected between the lock short-circuit protection circuit and the CPU main control circuit, and the CPU main control circuit controls the lock short-circuit protection circuit to allow or prohibit voltage output according to a read voltage value; the lock short-circuit protection circuit with the MP2315 chip outputs stable voltage to serve as a power supply of the electromagnetic lock, short-circuit feedback detection is achieved through the lock short-circuit detection circuit, and therefore the functions of electromagnetic lock short-circuit fault detection and protection are achieved, potential safety hazards caused by lock faults are effectively reduced, and the product operation and maintenance cost is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of electromagnetic lock detection, and in particular to a control circuit that supports lock short-circuit protection. Background Technology

[0002] An electromagnetic lock is a type of smart lock that can be controlled by a switching circuit. Electromagnetic locks are typically inductive loads, and their opening is controlled by a short-term energization of a control coil.

[0003] During the testing of electromagnetic locks, short circuit faults are prone to occur due to human error or the lifespan of the components themselves. Existing technology mainly uses sampling resistors to collect current for protection circuits, which do not have voltage regulation output function, have a small applicable power supply range, large voltage fluctuations, and the protection circuit is prone to overheating when in a fault state for a long time, posing a safety hazard. Utility Model Content

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of the present invention, to avoid obscuring the purpose of these documents, and such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0005] Therefore, the purpose of this utility model is to provide a control circuit that supports lock short-circuit protection. It uses a lock short-circuit protection circuit with an MP2315 chip to output a stable voltage as the power supply for the electromagnetic lock, and uses a lock short-circuit detection circuit to realize short-circuit feedback detection, thereby realizing the function of electromagnetic lock short-circuit fault detection and protection, effectively reducing the safety hazards caused by lock failure and reducing product operation and maintenance costs.

[0006] To solve the above technical problems, this utility model provides a control circuit that supports lockout short-circuit protection, and adopts the following technical solution: The control circuit that supports lockout short-circuit protection includes a lockout short-circuit protection circuit and a lockout short-circuit detection circuit. The lockout short-circuit protection circuit is connected to a 9-24V power supply voltage, and after voltage regulation, it outputs a fixed 15V. The lockout short-circuit detection circuit is connected between the lockout short-circuit protection circuit and the CPU main control circuit. The CPU main control circuit controls the lockout short-circuit protection circuit to allow or prohibit voltage output based on the read voltage value.

[0007] Optionally, the short-circuit protection circuit uses the MP2315 chip.

[0008] Optionally, pin 1 of the MP2315 chip is connected to a pull-down resistor R232, pin 2 of the MP2315 chip is connected to the power input, pin 4 of the MP2315 chip is grounded, pin 6 of the MP2315 chip is connected to the power input through a resistor R236, and pin 7 of the MP2315 chip is grounded through a capacitor C45.

[0009] Optionally, pin 3 of the MP2315 chip is connected to the first end of inductor L2, pin 8 of the MP2315 chip is connected to the first ends of resistor R234 and resistor R235, the second end of resistor R235 is grounded, the second end of resistor R234 and the second end of inductor L2 are connected to the first ends of capacitor C47, resistor R320 and resistor R231, the second ends of capacitor C47 and resistor R320 are grounded together, and the second end of resistor R231 is connected to the MOS control circuit.

[0010] Optionally, pin 5 of the MP2315 chip is connected to the first end of resistor R233, the second end of R233 is connected to the first end of capacitor C46, ​​and the second end of capacitor C46 is connected to the first end of inductor L2.

[0011] Optionally, the resistance value of resistor R234 is 27KΩ, the resistance value of resistor R235 is 1.5KΩ, and the resistance value of resistor R231 is 500mΩ.

[0012] Optionally, the short-circuit detection circuit includes resistors R273 and R274 and a Zener diode D81. The first end of resistor R273 is connected to the MOS control circuit, and the second end of resistor R273 is connected to the negative terminal of Zener diode D81, the first end of resistor R274, and the CPU main control circuit. The positive terminal of Zener diode D81 and the second end of resistor R274 are grounded together.

[0013] Optionally, the CPU main control circuit reads a voltage value ranging from 0 to 4.2V. When the CPU main control circuit reads a voltage value of 0V, the CPU main control circuit controls the short-circuit protection circuit to prohibit voltage output.

[0014] In summary, this utility model has at least one of the following beneficial effects:

[0015] This invention uses a lock short-circuit protection circuit with an MP2315 chip to output a stable voltage as the power supply for the electromagnetic lock, and uses a lock short-circuit detection circuit to realize short-circuit feedback detection, thereby realizing the function of short-circuit fault detection and protection of the electromagnetic lock, effectively reducing the safety hazards caused by lock failure and reducing product operation and maintenance costs. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a block diagram of the control circuit principle for supporting lock-up short-circuit protection of this utility model;

[0018] Figure 2 This is a schematic diagram of the control circuit that supports short-circuit protection of this utility model. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0020] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] Example

[0023] Reference Figure 1This utility model discloses a control circuit that supports short-circuit protection. The control circuit includes a short-circuit protection circuit and a short-circuit detection circuit. The short-circuit protection circuit is connected to a 9-24V power supply voltage and outputs a fixed 15V after voltage regulation. The short-circuit detection circuit is connected between the short-circuit protection circuit and the CPU main control circuit. The CPU main control circuit controls the short-circuit protection circuit to allow or prohibit voltage output based on the read voltage value.

[0024] Specifically, in this embodiment, the lock short-circuit protection circuit uses the MP2315 chip. In addition to the following functions, the MP2315 chip also has overcurrent, overvoltage, and overtemperature protection functions, which play a good protective role for the electromagnetic lock during operation.

[0025] Reference Figure 2 In detail, in this embodiment, the 75K pull-down resistor R232 for pin 1 of the MP2315 chip is used to set it to asynchronous mode. Pin 2 of the MP2315 chip is connected to the power input, which can be 12 to 24V. Pin 4 of the MP2315 chip is grounded. Pin 6 of the MP2315 chip is connected to the power input through the 200K resistor R236. In order to enable the MP2315 chip to work normally after power-on, pin 7 of the MP2315 chip is grounded through the capacitor C45 for decoupling.

[0026] Pin 3 of the MP2315 chip is connected to the first terminal of the 4.7uH inductor L2. The converted output is connected to the 4.7uH inductor L2 to filter ripple. Pin 8 of the MP2315 chip is connected to the first terminals of resistors R234 and R235. Pin 8 of the MP2315 chip is the feedback pin voltage of 791mV, which is obtained by voltage division through resistors R234 and R235. Here, 15V can be output. The second terminal of resistor R235 is grounded. The second terminal of resistor R234 and the second terminal of the 4.7uH inductor L2 are connected to the first terminals of capacitor C47, resistor R320, and resistor R231. The second terminals of capacitor C47 and resistor R320 are grounded together. The second terminal of resistor R231 is connected to the MOS control circuit. Resistor R231 is used to protect the MOS control circuit from short-term damage.

[0027] Pin 5 of the MP2315 chip is connected to the first end of resistor R233. The second end of R233 is connected to the first end of capacitor C46. The second end of capacitor C46 is connected to the first end of 4.7uH inductor L2, forming a floating power supply on the high-voltage switch driver.

[0028] In detail, in this embodiment, the resistance value of resistor R234 is 27KΩ, the resistance value of resistor R235 is 1.5KΩ, and the resistance value of resistor R231 is 500mΩ. A fixed output of 15V is sent to the MOS control circuit, which is used to control the opening and closing of the lock interface.

[0029] In detail, in this embodiment, the short-circuit detection circuit includes resistors R273 and R274 and a 5.1V Zener diode D81. The first terminal of resistor R273 is connected to the MOS control circuit, and the second terminal of resistor R273 is connected to the negative terminal of the 5.1V Zener diode D81, the first terminal of resistor R274, and the CPU main control circuit. The positive terminal of the 5.1V Zener diode D81 and the second terminal of resistor R274 are grounded together. Resistors R273 and R274 are used for voltage division, and the 5.1V Zener diode D81 is used for voltage regulation to prevent damage to the CPU main control circuit caused by exceeding the voltage that the CPU main control circuit can withstand.

[0030] The CPU main control circuit can read the voltage value of the control circuit supporting short-circuit protection from 0 to 4.2V. When the circuit is working normally, the microcontroller reads 4.2V, and when short-circuited, it reads 0V, thus providing feedback on whether the circuit is working properly. When the CPU main control circuit reads a voltage value of 0V, it controls the short-circuit protection circuit, which uses the MP2315 chip internally to prevent voltage output, thereby providing protection.

[0031] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A control circuit supporting lock short circuit protection, characterized by: The control circuit supporting the lock short circuit protection comprises a lock short circuit protection circuit and a lock short circuit detection circuit, the lock short circuit protection circuit is connected to a 9-24V power supply voltage, and outputs 15V after voltage stabilization, the lock short circuit detection circuit is connected between the lock short circuit protection circuit and a CPU main control circuit, and the CPU main control circuit controls the lock short circuit protection circuit to allow or prohibit voltage output according to a read voltage value.

2. The control circuit supporting lock short-circuit protection according to claim 1, characterized in that: The lock short circuit protection circuit adopts an MP2315 chip.

3. The control circuit supporting lock short-circuit protection according to claim 2, characterized in that: Pin 1 of the MP2315 chip is connected to a pull-down resistor R232, pin 2 of the MP2315 chip is connected to a power input, pin 4 of the MP2315 chip is grounded, pin 6 of the MP2315 chip is connected to the power input through a resistor R236, and pin 7 of the MP2315 chip is grounded through a capacitor C45.

4. The control circuit supporting lock short-circuit protection according to claim 3, characterized in that: Pin 3 of the MP2315 chip is connected to a first end of an inductor L2, pin 8 of the MP2315 chip is connected to a first end of a resistor R234 and a first end of a resistor R235, a second end of the resistor R235 is grounded, a second end of the resistor R234 is connected to a first end of a capacitor C47, a first end of a resistor R320 and a first end of a resistor R231, a second end of the capacitor C47 and a second end of the resistor R320 are commonly grounded, and a second end of the resistor R231 is connected to a MOS control circuit.

5. The control circuit supporting lock short-circuit protection according to claim 4, characterized in that: Pin 5 of the MP2315 chip is connected to a first end of a resistor R233, a second end of the R233 is connected to a first end of a capacitor C46, and a second end of the capacitor C46 is connected to the first end of the inductor L2.

6. The control circuit supporting lock short-circuit protection according to claim 4, characterized in that: The resistor R234 has a resistance value of 27KΩ, the resistor R235 has a resistance value of 1.5KΩ, and the resistor R231 has a resistance value of 500mΩ.

7. A control circuit supporting lock short-circuit protection according to any one of claims 4-6, characterized in that: The lock short circuit detection circuit comprises a resistor R273, a resistor R274 and a voltage stabilizing tube D81, a first end of the resistor R273 is connected to the MOS control circuit, a second end of the resistor R273 is connected to a negative electrode of the voltage stabilizing tube D81, a first end of the resistor R274 and the CPU main control circuit, a positive electrode of the voltage stabilizing tube D81 and a second end of the resistor R274 are commonly grounded.

8. The control circuit supporting lock short-circuit protection according to claim 7, characterized in that: The CPU main control circuit reads a voltage value in a range of 0 to 4.2V, and when the CPU main control circuit reads a voltage value of 0V, the CPU main control circuit controls the lock short circuit protection circuit to prohibit voltage output.

Images