Security fence driving control circuit

Abstract

The utility model relates to the technical field of security, and provides a security fence driving control circuit, which comprises a master control module, a driving circuit and a motor which are sequentially connected, the motor drives a security fence to work under the control of the driving circuit, the security fence driving control circuit further comprises a speed detection module and a brake protection circuit, the speed detection module is installed on the security fence, and the brake protection circuit is connected with the master control module. And the brake protection circuit is used for sending the moving speed of the security fence to the main control module, the input end of the brake protection circuit is connected with the main control module and receives a first safety control signal sent by the main control module, and the output end of the brake protection circuit is connected with the motor. By means of the technical scheme, the technical problem that in the prior art, a movable security fence is lack of protection measures for the driving motor is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of security, and specifically, to a driving control circuit for a security fence. Background Art

[0002] A security fence is a facility used to isolate dangerous areas and protect the safety of personnel and equipment. As an important safety facility, security fences are widely used in various occasions, including industrial, transportation, construction and other fields. In industrial production, protective fences can prevent workers from accidentally entering the area where machines are operating and avoid work-related injury accidents. In the transportation field, protective fences can prevent vehicles from running off the road and ensure driving safety. In the construction industry, protective fences can be used for safety isolation at construction sites to prevent unauthorized personnel from entering the construction site.

[0003] In order to be applicable to temporarily isolate dangerous or important occasions, the application of mobile protective fences is becoming more and more widespread. For such security fences, specific control methods are often required to determine the working state of the internal motor to achieve the switching of the opening and closing states of the security fence. At present, most of such security fences do not have a protection function. When they are collided or deliberately blocked by people, when the internal motor suddenly brakes, due to the existence of back electromotive force, a large pump-up voltage may be generated at both ends of the motor, and the impact force of the collision cannot be weakened in time, which is likely to damage the motor. Summary of the Utility Model

[0004] The utility model provides a driving control circuit for a security fence, which solves the technical problem in the prior art that there is a lack of protection measures for the driving motor of a movable security fence.

[0005] The technical solution of the utility model is as follows:

[0006] A driving control circuit for a security fence includes a main control module, a driving circuit and a motor connected in sequence. The motor drives the security fence to work under the control of the driving circuit. The driving control circuit further includes a speed detection module and a braking protection circuit. The speed detection module is installed on the security fence and is used to send the moving speed of the security fence to the main control module. The input end of the braking protection circuit is connected to the main control module to receive a first safety control signal sent by the main control module, and the output end of the braking protection circuit is connected to the motor.

[0007] Further, the braking protection circuit includes a MOS transistor Q2, a resistor R3 and a resistor R4. The gate of the MOS transistor Q2 is connected to the main control module through the resistor R4 to receive the first safety control signal safe_1. The drain of the MOS transistor Q2 is connected to the positive pole of the motor, the source of the MOS transistor Q2 is connected to the negative pole of the motor, and the source of the MOS transistor Q2 is connected to the gate of the MOS transistor Q2 through the resistor R3.

[0008] Further, the drive circuit includes a resistor R1, a resistor R2, a MOS transistor Q1, a diode D1, a capacitor C1, and a capacitor C2. The gate of the MOS transistor Q1 is connected to the main control module through the resistor R1 to receive a drive signal LO. The drain of the MOS transistor Q1 is connected to the negative electrode of the motor. The positive electrode of the motor is connected to a power supply. The source of the MOS transistor Q1 is grounded. The source of the MOS transistor Q1 is also connected to the gate of the MOS transistor Q1 through the resistor R2. The anode of the diode D1 is connected to the negative electrode of the motor, and the cathode of the diode D1 is connected to the positive electrode of the motor. The capacitor C1 and the capacitor C2 are first connected in series and then connected in parallel across the two ends of the motor.

[0009] Further, a fault protection circuit is also included. The fault protection circuit includes a triode Q4, a MOS transistor Q3, a resistor R5, a resistor R6, a resistor R7, a resistor R8, and a resistor R9. The base of the triode Q4 is connected to the first end of the resistor R7. The second end of the resistor R7 is connected to the main control module to receive a second safety control signal safe_2. The second end of the resistor R7 is connected to a 5V power supply through the resistor R8. The emitter of the triode Q4 is grounded. The collector of the triode Q4 is connected to the gate of the MOS transistor Q3 through the resistor R5. The collector of the triode Q4 is also connected to a 12V power supply through the resistor R9. The MOS transistor Q3 is connected in series between the source of the MOS transistor Q1 and the ground. The drain of the MOS transistor Q3 is connected to the source of the MOS transistor Q1, and the source of the MOS transistor Q3 is grounded. The source of the MOS transistor Q3 is also connected to the gate of the MOS transistor Q3 through the resistor R6.

[0010] Further, the speed detection module is connected to the main control module through a serial communication circuit. The serial communication circuit includes a triode Q5, a triode Q6, a diode D2, a resistor R10, a resistor R12, a resistor R13, a resistor R14, and a resistor R15. The base of the triode Q6 is connected to the speed detection module through the resistor R15. The collector of the triode Q6 is connected to a 5V power supply. The emitter of the triode Q6 is grounded after being connected in series with the resistor R13 and the resistor R14 in sequence. The base of the triode Q5 is connected to the connection point of the resistor R13 and the resistor R14. The emitter of the triode Q5 is grounded. The collector of the triode Q5 is connected to the cathode of the diode D2 through the resistor R12. The anode of the diode D2 is connected to a 5V power supply. The collector of the triode Q5 is connected to the main control module through the resistor R10.

[0011] The working principle and beneficial effects of the present utility model are as follows:

[0012] In the present utility model, the drive circuit receives a control signal from the main control module to control the starting, stopping, accelerating, decelerating and other actions of the motor, thereby driving the opening, closing or moving of the security fence. The speed detection module monitors the moving speed of the fence in real time, converts the detected speed information into an electrical signal, and sends it to the main control module. When the security fence suddenly stops, the main control module outputs a first safety control signal to make the braking protection circuit conduct to share the braking current to prevent damage to the drive circuit, enabling the drive motor of the security fence to maintain a stable operating state, improving the stability and reliability of the fence operation, and achieving precise control and safety protection of the security fence. The following further details the present utility model in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic block diagram of the present utility model;

[0014] Figure 2 is a schematic circuit diagram of the braking protection circuit in the present utility model;

[0015] Figure 3 is a schematic circuit diagram of the drive circuit in the present utility model;

[0016] Figure 4 is a schematic circuit diagram of the serial communication circuit in the present utility model;

[0017] Figure 5 is a schematic circuit diagram of the fault protection circuit in the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0019] Embodiment 1

[0020] Figure 1 is a schematic block diagram of the present utility model. As Figure 1 shown, this embodiment proposes a security fence drive control circuit, including a main control module, a drive circuit and a motor connected in sequence. The motor drives the security fence to work under the control of the drive circuit. It also includes a speed detection module and a braking protection circuit. The speed detection module is installed on the security fence and is used to send the moving speed of the security fence to the main control module. The input end of the braking protection circuit is connected to the main control module to receive the first safety control signal sent by the main control module, and the output end of the braking protection circuit is connected to the motor.

[0021] In this embodiment, the drive circuit receives a control signal from the main control module to control the starting, stopping, accelerating, decelerating and other actions of the motor, thereby driving the opening, closing or moving of the security fence. The speed detection module monitors the moving speed of the fence in real time, converts the detected speed information into an electrical signal, and sends it to the main control module. When the security fence suddenly stops, the main control module outputs a first safety control signal to turn on the braking protection circuit to share the braking current to prevent damage to the drive circuit, enabling the drive motor of the security fence to maintain a stable operating state, improving the stability and reliability of the fence operation, and achieving precise control and safety protection of the security fence.

[0022] Figure 2 It is a circuit schematic diagram of the braking protection circuit in the present utility model, as Figure 2 shown. The braking protection circuit includes MOS transistor Q2, resistor R3 and resistor R4. The gate of MOS transistor Q2 is connected to the main control module through resistor R4 to receive the first safety control signal safe_1. The drain of MOS transistor Q2 is connected to the positive pole of the motor, the source of MOS transistor Q2 is connected to the negative pole of the motor, and the source of MOS transistor Q2 is connected to the gate of MOS transistor Q2 through resistor R3.

[0023] In this embodiment, the main control module outputs the first safety control signal safe_1 to turn on MOS transistor Q2 to share the braking current to prevent damage to the drive circuit.

[0024] Figure 3 It is a circuit schematic diagram of the drive circuit in the present utility model, as Figure 3 shown. The drive circuit includes resistor R1, resistor R2, MOS transistor Q1, diode D1, capacitor C1 and capacitor C2. The gate of MOS transistor Q1 is connected to the main control module through resistor R1 to receive the drive signal LO. The drain of MOS transistor Q1 is connected to the negative pole of the motor, the positive pole of the motor is connected to the power supply, the source of MOS transistor Q1 is grounded, the source of MOS transistor Q1 is also connected to the gate of MOS transistor Q1 through resistor R2. The anode of diode D1 is connected to the negative pole of the motor, the cathode of diode D1 is connected to the positive pole of the motor, and capacitor C1 and capacitor C2 are first connected in series and then connected in parallel across the two ends of the motor.

[0025] In this embodiment, when the main control module issues a high-level drive signal LO, the MOS transistor Q1 conducts, and the motor starts to work. The current flows into the positive terminal of the motor from the positive terminal of the power supply, flows out from the negative terminal after passing through the motor, and returns to the ground through the MOS transistor Q1. When the main control module issues a low-level drive signal LO, the MOS transistor Q1 is cut off, and the motor stops working. However, due to the characteristics of the inductor, a back electromotive force will be generated inside the motor. At this time, the freewheeling diode D1 conducts, providing a path for the reverse current and protecting other components in the circuit. The capacitors C1 and C2 play a role in smoothing voltage fluctuations, reducing electromagnetic interference, and filtering during the operation of the motor. The drive signal LO is a PWM signal, and the speed of the motor is controlled by adjusting the duty cycle of the PWM signal.

[0026] In one embodiment, the speed detection module is connected to the main control module through a serial communication circuit.

[0027] Figure 4 The circuit schematic diagram of the serial communication circuit in the present utility model is shown in Figure 4 As shown, the serial communication circuit includes a triode Q5, a triode Q6, a diode D2, a resistor R10, a resistor R12, a resistor R13, a resistor R14, and a resistor R15. The base of the triode Q6 is connected to the speed detection module through the resistor R15. The collector of the triode Q6 is connected to the 5V power supply. The emitter of the triode Q6 is grounded after being connected in series with the resistors R13 and R14 in sequence. The base of the triode Q5 is connected to the connection point of the resistors R13 and R14. The emitter of the triode Q5 is grounded. The collector of the triode Q5 is connected to the cathode of the diode D2 through the resistor R12. The anode of the diode D2 is connected to the 5V power supply. The collector of the triode Q5 is connected to the main control module through the resistor R10.

[0028] In this embodiment, the speed detection module uses an integrated module, and its communication output terminal is connected to the serial communication terminal of the main control module through a serial communication circuit. The speed detection module outputs an analog signal or a digital signal related to the moving speed of the security fence, which is applied to the base of Q6 through R15. Q6 will conduct, thereby generating a voltage drop across R13 and R14. The voltage drop across R13 and R14 causes the base voltage of Q5 to drop. When the base voltage is lower than the conduction threshold of Q5, Q5 conducts, and its collector current flows to the main control module through R12, D2, and R10. D2 ensures that the collector voltage of Q5 does not exceed its forward conduction voltage, thereby protecting the subsequent circuit. The main control module detects the output signal of the speed detection module by monitoring the voltage or current change across R10.

[0029] Embodiment 2

[0030] Based on Embodiment 1, this embodiment further includes a fault protection circuit.

[0031] Figure 5This is the circuit schematic diagram of the fault protection circuit in the present utility model. As Figure 5 shown, the fault protection circuit includes a triode Q4, a MOS transistor Q3, a resistor R5, a resistor R6, a resistor R7, a resistor R8, and a resistor R9. The base of the triode Q4 is connected to the first end of the resistor R7. The second end of the resistor R7 is connected to the main control module to receive the second safety control signal safe_2. The second end of the resistor R7 is connected to the 5V power supply through the resistor R8. The emitter of the triode Q4 is grounded. The collector of the triode Q4 is connected to the gate of the MOS transistor Q3 through the resistor R5. The collector of the triode Q4 is also connected to the 12V power supply through the resistor R9. The MOS transistor Q3 is connected in series between the source of the MOS transistor Q1 and the ground. The drain of the MOS transistor Q3 is connected to the source of the MOS transistor Q1. The source of the MOS transistor Q3 is grounded. The source of the MOS transistor Q3 is also connected to the gate of the MOS transistor Q3 through the resistor R6.

[0032] Under normal circumstances, the safe_2 signal is at a high level, and the triode Q4 is turned on. The current flows through R7, Q4, and R5, providing sufficient voltage for the gate of the MOS transistor Q3 to turn it on. After the MOS transistor Q3 is turned on, it does not interfere with the normal operation of the MOS transistor Q1. When the MOS transistor Q1 has a short-circuit fault due to an operating error, the main control module can disconnect the drive circuit by turning off the MOS transistor Q3, thereby stopping the motor and ensuring the safety of the device. When the main control module sends a low-level safe_2 signal, the triode Q4 is turned off. At this time, the gate voltage of the MOS transistor Q3 is not sufficient to turn it on, so the MOS transistor Q3 is in the off state, disconnecting the source of the MOS transistor Q1 from the ground, thereby cutting off the power path of the MOS transistor Q1.

[0033] The above is only the preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A security fence drive control circuit, comprising a main control module, a drive circuit and a motor connected in sequence, wherein the motor drives the security fence to work under the control of the drive circuit, characterized in that: It also includes a speed detection module and a braking protection circuit. The speed detection module is installed on the security fence and is used to send the moving speed of the security fence to the main control module. The input end of the braking protection circuit is connected to the main control module to receive the first safety control signal sent by the main control module. The output end of the braking protection circuit is connected to the motor.

2. A security fence drive control circuit according to claim 1, characterized in that: The braking protection circuit includes a MOS tube Q2, a resistor R3 and a resistor R4. The gate of the MOS tube Q2 is connected to the main control module through the resistor R4 to receive the first safety control signal safe_1. The drain of the MOS tube Q2 is connected to the positive electrode of the motor, the source of the MOS tube Q2 is connected to the negative electrode of the motor, and the source of the MOS tube Q2 is connected to the gate of the MOS tube Q2 through the resistor R3.

3. A security fence drive control circuit according to claim 1, characterized in that: The driving circuit includes a resistor R1, a resistor R2, a MOS tube Q1, a diode D1, a capacitor C1 and a capacitor C2. The gate of the MOS tube Q1 is connected to the main control module through the resistor R1 to receive a driving signal LO. The drain of the MOS tube Q1 is connected to the negative electrode of the motor, the positive electrode of the motor is connected to a power supply, the source of the MOS tube Q1 is grounded, and the source of the MOS tube Q1 is also connected to the gate of the MOS tube Q1 through the resistor R2. The anode of the diode D1 is connected to the negative electrode of the motor, and the cathode of the diode D1 is connected to the positive electrode of the motor. The capacitor C1 and the capacitor C2 are first connected in series and then connected in parallel at both ends of the motor.

4. A security fence drive control circuit according to claim 3, characterized in that: It also includes a fault protection circuit, which includes a transistor Q4, a MOS transistor Q3, a resistor R5, a resistor R6, a resistor R7, a resistor R8 and a resistor R9. The base of the transistor Q4 is connected to the first end of the resistor R7, the second end of the resistor R7 is connected to the main control module, and receives the second safety control signal safe_2. The second end of the resistor R7 is connected to a 5V power supply through the resistor R8. The emitter of the transistor Q4 is grounded, the collector of the transistor Q4 is connected to the gate of the MOS transistor Q3 through the resistor R5, and the collector of the transistor Q4 is also connected to a 12V power supply through the resistor R9. The MOS transistor Q3 is connected in series between the source of the MOS transistor Q1 and the ground, the drain of the MOS transistor Q3 is connected to the source of the MOS transistor Q1, the source of the MOS transistor Q3 is grounded, and the source of the MOS transistor Q3 is also connected to the gate of the MOS transistor Q3 through the resistor R6.

5. The security fence drive control circuit according to claim 1, characterized in that: The speed detection module is connected to the main control module through a serial communication circuit, and the serial communication circuit includes a transistor Q5, a transistor Q6, a diode D2, a resistor R10, a resistor R12, a resistor R13, a resistor R14 and a resistor R15. The base of the transistor Q6 is connected to the speed detection module through the resistor R15, the collector of the transistor Q6 is connected to a 5V power supply, the emitter of the transistor Q6 is connected in series with the resistor R13 and the resistor R14 in sequence and then grounded, the base of the transistor Q5 is connected to the connection point of the resistor R13 and the resistor R14, the emitter of the transistor Q5 is grounded, the collector of the transistor Q5 is connected to the cathode of the diode D2 through the resistor R12, the anode of the diode D2 is connected to the 5V power supply, and the collector of the transistor Q5 is connected to the main control module through the resistor R10.

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