Electromagnetic door lock control circuit capable of being cascaded, cascaded electromagnetic door lock control system, electromagnetic door lock and production line

Abstract

The utility model discloses a cascading electromagnetic door lock control circuit, a cascading electromagnetic door lock control system, an electromagnetic door lock and a production line, and the cascading electromagnetic door lock control circuit comprises an OSSD output unit which is used for outputting an OSSD signal to an upper computer or a superior electromagnetic door lock according to an OSSD control signal, and an electric safety input unit which is used for receiving the OSSD signal of a subordinate electromagnetic door lock, the locking input unit is used for receiving a locking signal of an upper computer, the electromagnet driving unit is used for converting a locking driving signal into a control level for electromagnet attraction force, and the MCU main control unit sends an OSSD control signal to the OSSD output unit. And the locking driving unit receives a safety input signal of the safety input unit and a locking input signal of the locking input unit, and sends a locking driving signal to the electromagnet driving unit. According to the utility model, whether the function of the electromagnetic door lock is abnormal or not can be known in a cascading manner, so that the whole assembly line can be controlled not to work, and the operation safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electromagnetic door locks, in particular to an electromagnetic door lock control circuit capable of cascading. Background Art

[0002] When an electromagnetic door lock is applied to the industrial field, it is usually coordinated with manufacturing equipment and installed on the door of the equipment. Generally, an electromagnetic door lock consists of an electromagnetic main body and a matcher, one is installed on the door and the other is installed on the door frame. The electromagnet in the electromagnetic main body and the matcher can generate an attracting force of 1300N under the action of electromagnetic force, so that the door of the equipment can be kept locked during the working state, avoiding the danger caused by workers accidentally breaking in.

[0003] The existing electromagnetic door locks do not have the cascading function. Therefore, if a certain door on an entire production line is not closed properly, the upper computer for terminal control cannot detect it at this time. If the production line operation is directly carried out, it may lead to dangerous situations and affect the operation safety of workers.

[0004] In view of this, a new electromagnetic door lock control circuit needs to be proposed to improve the above problems. Summary of the Utility Model

[0005] The purpose of the utility model is to provide an electromagnetic door lock control circuit capable of cascading. Through the cascading method, the upper computer can know whether there is an abnormal function of the electromagnetic door lock. Furthermore, the upper computer can control the entire production line not to operate, preventing the danger caused by a certain equipment door not being closed properly, thereby improving the operation safety.

[0006] The utility model provides the following solutions:

[0007] According to the first aspect, the utility model proposes an electromagnetic door lock control circuit capable of cascading, including:

[0008] An OSSD output unit for outputting an OSSD signal to an upper computer or a superior electromagnetic door lock according to an OSSD control signal;

[0009] A safety input unit for receiving the OSSD signal of a lower electromagnetic door lock and converting it into a safety input signal;

[0010] A lock input unit for receiving a lock signal from an upper computer and converting it into a lock input signal;

[0011] An electromagnet driving unit for converting a lock driving signal into a control level for the attracting force of the electromagnet;

[0012] The MCU main control unit is respectively connected to the OSSD output unit, the safety input unit, the locking input unit, and the electromagnet drive unit, and is configured to send the OSSD control signal to the OSSD output unit, receive the safety input signal from the safety input unit and the locking input signal from the locking input unit, and send a locking drive signal to the electromagnet drive unit; and

[0013] The power supply unit is configured to provide a first DC power supply and a second DC power supply for the OSSD output unit, provide a first DC power supply for the electromagnet drive unit, and provide a second DC power supply for the MCU main control unit.

[0014] Optionally, the OSSD output unit includes two sets of OSSD output circuits with exactly the same structure. The OSSD output circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a first fuse, a first voltage regulator tube, a second voltage regulator tube, and a third voltage regulator tube. The first switching tube is an NPN transistor, the second switching tube is a composite PNP transistor, the third switching tube is an NPN transistor, the fourth switching tube is a composite NPN transistor. The positive OSSD control signal terminal of the MCU main control unit is connected to the second DC power supply through the first resistor and connected to the base of the first switching tube through the second resistor. The collector of the first switching tube is connected to the first DC power supply through the third resistor and connected to the base of the second switching tube through the fourth resistor. The emitter of the first switching tube is grounded. The emitter of the second switching tube is connected to the first DC power supply through the fifth resistor. The collector of the second switching tube is connected to the first end of the first fuse. The negative OSSD control signal terminal of the MCU main control unit is connected to the second DC power supply through the sixth resistor and connected to the base of the third switching tube through the seventh resistor. The collector of the third switching tube is connected to the first DC power supply through the eighth resistor and connected to the base of the fourth switching tube through the ninth resistor. The emitter of the third switching tube is grounded. The emitter of the fourth switching tube is grounded through the tenth resistor. The collector of the fourth switching tube is connected to the first end of the first fuse. The second end of the first fuse serves as the output terminal of the OSSD signal and is connected to the anode of the first voltage regulator tube and the cathode of the second voltage regulator tube. The cathode of the first voltage regulator tube is connected to the first DC power supply. The anode of the second voltage regulator tube is grounded. The second end of the first fuse is also connected to the cathode of the third voltage regulator tube through the eleventh resistor. The anode of the third voltage regulator tube is grounded. The cathode of the third voltage regulator tube serves as the OSSD feedback signal output terminal of the OSSD output circuit. The two ends of the third voltage regulator tube are also shunted with the twelfth resistor.

[0015] Optionally, the safety input unit includes two sets of safety input circuits with exactly the same structure. The safety input circuit includes a second fuse, a first TVS tube, a thirteenth resistor, a fourteenth resistor, and a first optocoupler. The first end of the second fuse serves as the input end of the safety input circuit and is connected to the OSSD signal output end of the lower-level electromagnetic door lock. The second end of the second fuse is connected to the first end of the first TVS tube and the first end of the thirteenth resistor. The second end of the first TVS tube is grounded. The second end of the thirteenth resistor is connected to the positive end of the emission side of the first optocoupler. The negative end of the emission side of the first optocoupler is grounded. The fourteenth resistor is connected in parallel across both ends of the emission side of the first optocoupler. The positive end of the receiving side of the first optocoupler serves as the output end of the safety input circuit and is connected to the safety input signal receiving end of the MCU main control unit. The negative end of the receiving side of the first optocoupler is grounded.

[0016] Optionally, the locking input unit includes a third fuse, a second TVS tube, a fifteenth resistor, a sixteenth resistor, and a second optocoupler. The first end of the third fuse serves as the input end of the locking input unit and is connected to the locking control end of the host computer. The second end of the third fuse is connected to the first end of the second TVS tube and the first end of the fifteenth resistor. The second end of the second TVS tube is grounded. The second end of the fifteenth resistor is connected to the positive end of the emission side of the second optocoupler. The negative end of the emission side of the second optocoupler is grounded. The sixteenth resistor is connected in parallel across both ends of the emission side of the second optocoupler. The positive end of the receiving side of the second optocoupler serves as the output end of the locking input unit and is connected to the locking input signal receiving end of the MCU main control unit. The negative end of the receiving side of the second optocoupler is grounded.

[0017] Optionally, the electromagnet driving unit includes a fifth switching tube, a sixth switching tube, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a first capacitor, and a fourth voltage regulator tube. The fifth switching tube is an NPN transistor. The sixth switching tube is an NMOS tube. The base of the fifth switching tube is connected to the electromagnet driving control end of the MCU main control unit. The emitter of the fifth switching tube is grounded. The collector of the fifth switching tube is connected to the first end of the seventeenth resistor. The second end of the seventeenth resistor is connected to the first DC power supply through the eighteenth resistor. The second end of the seventeenth resistor is also connected to the gate of the sixth switching tube through the nineteenth resistor. The source of the sixth switching tube is grounded. The first capacitor is connected in parallel between the gate and the source of the sixth switching tube. The drain of the sixth switching tube is connected to the first DC power supply through the fourth voltage regulator tube. Both ends of the fourth voltage regulator tube are connected to the electromagnet.

[0018] Optionally, it further includes an LED display unit. The LED display unit includes multiple groups of identical LED display circuits. Each LED display circuit includes a twentieth resistor and a three-color LED module. The anode of the three-color LED module is connected to the second DC power supply through the twentieth resistor, and the three cathodes of the three-color LED module are respectively connected to the red control terminal, green control terminal, and blue control terminal of the MCU main control unit.

[0019] Optionally, the power supply unit includes a protection and filtering module, a voltage conversion module, a first DC power supply detection module, and a second DC power supply detection module. The DC power supply of the external power adapter passes through the protection and filtering module to obtain the first DC power supply. The first DC power supply passes through the voltage conversion module to obtain the second DC power supply. The first DC power supply detection module is used to obtain the voltage of the first DC power supply and transmit it to the MCU main control unit, and the second DC power supply detection module is used to obtain the voltage of the second DC power supply and transmit it to the MCU main control unit.

[0020] According to a second aspect, the present invention provides a cascaded electromagnetic door lock control system, including a host computer and multiple groups of electromagnetic door lock control circuits capable of cascading as described in the first aspect above. The locking control terminal of the host computer is connected to the locking input unit of each group of the electromagnetic door lock control circuits capable of cascading. The door lock state detection terminal of the host computer is connected to the OSSD output unit of the first-stage electromagnetic door lock control circuit capable of cascading. The safety input unit of each stage of the electromagnetic door lock control circuit capable of cascading is connected to the OSSD output unit of the next-stage electromagnetic door lock control circuit capable of cascading.

[0021] According to a third aspect, the present invention provides an electromagnetic door lock, which is electrically connected to the electromagnetic door lock control circuit capable of cascading as described in the first aspect above, or is electrically connected to the cascaded electromagnetic door lock control system as described in the second aspect above.

[0022] According to a fourth aspect, the present invention provides a production line, on which is provided a cascaded electromagnetic door lock control system as described in the second aspect above, and the cascaded electromagnetic door lock control system is electrically connected to the electromagnetic door lock as described in the third aspect above.

[0023] The present invention has the following advantages compared with the prior art:

[0024] The utility model is applicable to the scenario where one host computer controls the opening and closing of multiple electromagnetic door locks. The OSSD output unit of the first-stage electromagnetic door lock is connected to the host computer, and the OSSD output units of subsequent stages of electromagnetic door locks are all connected to the safety input unit of the previous-stage electromagnetic door lock, and each stage of electromagnetic door locks can be connected in series. The input circuit receives the OSSD signal sent by the previous-stage control circuit and forwards it to the next-stage control circuit to ensure the correct and reliable transmission of the OSSD signal throughout the system. When the control circuit of the last-stage electromagnetic door lock functions normally, it can output the OSSD signal to the previous-stage electromagnetic door lock. For non-last-stage electromagnetic door locks, when the control circuit functions normally and can receive the OSSD signal from the lower stage, it can output the OSSD signal to the previous-stage electromagnetic door lock; otherwise, it cannot output the OSSD signal to the previous-stage electromagnetic door lock. When the host computer receives the OSSD signal of the first-stage electromagnetic door lock, it indicates that all the series-connected electromagnetic door locks can work normally, and the host computer can output the locking signal to all the electromagnetic door locks. After each electromagnetic door lock receives the locking signal, the MCU main control unit controls the electromagnet driving unit to complete the locking of the electromagnetic door lock. If the host computer does not receive the OSSD signal, it indicates that there is a functional abnormality in the series-connected electromagnetic door locks, and the assembly line cannot start operation. Therefore, through the cascading method, the host computer of the utility model can know whether there is a functional abnormality in the electromagnetic door lock, and then the host computer can control the entire assembly line not to operate, preventing danger caused by the door of a certain device not being properly closed, thereby improving the operation safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 is the principle block diagram of an embodiment of the electromagnetic door lock control circuit capable of cascading of the present utility model.

[0027] Figure 2 is the circuit schematic diagram of the OSSD output unit.

[0028] Figure 3 is the circuit schematic diagram of the safety input unit.

[0029] Figure 4 is the circuit schematic diagram of the locking input unit.

[0030] Figure 5 is the circuit schematic diagram of the electromagnet driving unit.

[0031] Figure 6 It is a principle block diagram of another cascadable electromagnetic door lock control circuit embodiment of the present utility model.

[0032] Figure 7 It is a circuit schematic diagram of the LED display unit.

[0033] Figure 8 It is a circuit schematic diagram of the power supply unit.

[0034] Figure 9 It is a principle block diagram of a cascaded electromagnetic door lock control system embodiment of the present utility model.

[0035] Figure 10 It is a structural diagram between the electromagnetic main body and the matcher.

[0036] In the figure:

[0037] 100 - OSSD output unit, 200 - safety input unit, 300 - locking input unit, 400 - electromagnet drive unit, 500 - MCU main control unit, 600 - power supply unit, 610 - protection and filtering module, 620 - voltage conversion module, 630 - first DC power detection module, 640 - second DC power detection module, 700 - LED display unit, 1 - electromagnetic main body, 2 - matcher. Specific implementation manners

[0038] Next, the technical solutions of the present utility model will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of 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 shall fall within the protection scope of the present utility model.

[0039] See Figure 1 , the present utility model proposes a cascadable electromagnetic door lock control circuit embodiment, including an OSSD output unit 100, a safety input unit 200, a locking input unit 300, an electromagnet drive unit 400, an MCU main control unit 500, and a power supply unit 600.

[0040] The OSSD output unit 100 is used to output an OSSD signal to the host computer or the upper-level electromagnetic door lock according to the OSSD control signal. The safety input unit 200 is used to receive the OSSD signal of the lower-level electromagnetic door lock and convert it into a safety input signal. The locking input unit 300 is used to receive the locking signal of the host computer and convert it into a locking input signal. The electromagnet driving unit 400 is used to convert the locking drive signal into a control level for the suction force of the electromagnet. The MCU main control unit 500 is respectively connected to the OSSD output unit 100, the safety input unit 200, the locking input unit 300 and the electromagnet driving unit 400, and is used to send an OSSD control signal to the OSSD output unit 100, receive the safety input signal of the safety input unit 200 and the locking input signal of the locking input unit 300, and send a locking drive signal to the electromagnet driving unit 400. The power supply unit 600 is used to provide the first DC power supply +24V and the second DC power supply for the OSSD output unit 100, provide the first DC power supply for the electromagnet driving unit 400, and provide the second DC power supply for the MCU main control unit 500.

[0041] It should be noted that OSSD is the abbreviation of Optical Sensor Switching Device, an electrical device applied to protect the safety of personnel and equipment. The OSSD signal is a safety output signal that can inform users or other devices whether the current door lock is in a normal working state.

[0042] The working principle of this embodiment is as follows:

[0043] The embodiment of the electromagnetic door lock control circuit of the present utility model is applied to the scenario where one host computer controls the opening and closing of multiple electromagnetic door locks. Each electromagnetic door lock is provided with an electromagnetic door lock control circuit. For the connection method, please refer to Figure 9。The OSSD output unit of the first-level electromagnetic door lock is connected to the host computer, and the OSSD output units of subsequent levels of electromagnetic door locks are all connected to the safety input unit of the previous-level electromagnetic door lock, so that electromagnetic door locks at all levels can be connected in series. The safety input circuit receives the OSSD signal sent by the previous-level control circuit and forwards it to the next-level control circuit to ensure the correct and reliable transmission of the OSSD signal throughout the system. When the control circuit of the last-level electromagnetic door lock functions normally, it can output the OSSD signal to the previous-level electromagnetic door lock; when the control circuit of the electromagnetic door lock malfunctions, it cannot output the OSSD signal to the previous-level electromagnetic door lock. For non-last-level electromagnetic door locks, the OSSD signal can be output to the previous-level electromagnetic door lock only when the control circuit functions normally and the OSSD signal from the lower level can be received; otherwise, the OSSD signal cannot be output to the previous-level electromagnetic door lock. When the host computer receives the OSSD signal of the first-level electromagnetic door lock, it indicates that all series-connected electromagnetic door locks can work normally. The host computer can output a locking signal to all electromagnetic door locks. After each electromagnetic door lock receives the locking signal, the electromagnet driving unit is controlled by the MCU main control unit to complete the locking of the electromagnetic door lock. If the host computer does not receive the OSSD signal, it indicates that there is a malfunction in the series-connected electromagnetic door locks and the assembly line cannot start operation.

[0044] In the embodiment of the present utility model, through the cascading method, the host computer can know whether there is a malfunction in the electromagnetic door lock, and further, the host computer can control the entire assembly line not to operate, preventing danger caused by the door of a certain device not being properly closed, thereby improving the operation safety.

[0045] Through the cascading method, the host computer can know which device's door is not properly closed, so that the host computer can control the entire assembly line not to operate, preventing danger caused by the door of a certain device not being properly closed, thereby improving its safety.

[0046] In some embodiments, refer to Figure 2, the OSSD output unit 100 includes two sets of OSSD output circuits with exactly the same structure. The OSSD output circuit includes resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, resistor R7, resistor R8, resistor R9, resistor R10, resistor R11, resistor R12, switching transistor Q1, switching transistor Q2, switching transistor Q3, switching transistor Q4, fuse F1, zener diode D1, zener diode D2, and zener diode D3. Switching transistor Q1 is an NPN transistor, switching transistor Q2 is a composite PNP transistor, switching transistor Q3 is an NPN transistor, and switching transistor Q4 is a composite NPN transistor. The positive OSSD control signal terminal SC1_1 of the MCU main control unit 500 is connected to the second DC power supply through resistor R1 and to the base of switching transistor Q1 through resistor R2. The collector of switching transistor Q1 is connected to the first DC power supply through resistor R3 and to the base of switching transistor Q2 through resistor R4. The emitter of switching transistor Q1 is grounded. The emitter of switching transistor Q2 is connected to the first DC power supply through resistor R5. The collector of switching transistor Q2 is connected to the first end of fuse F1. The negative OSSD control signal terminal SC1_2 of the MCU main control unit 500 is connected to the second DC power supply through resistor R6 and to the base of switching transistor Q3 through resistor R7. The collector of switching transistor Q3 is connected to the first DC power supply through resistor R8 and to the base of switching transistor Q4 through resistor R9. The emitter of switching transistor Q3 is grounded. The emitter of switching transistor Q4 is grounded through resistor R10. The collector of switching transistor Q4 is connected to the first end of fuse F1. The second end of fuse F1 serves as the output terminal OSSD1 of the OSSD signal and is connected to the anode of zener diode D1 and the cathode of zener diode D2. The cathode of zener diode D1 is connected to the first DC power supply. The anode of zener diode D2 is grounded. The second end of fuse F1 is also connected to the cathode of zener diode D3 through resistor R11. The anode of zener diode D3 is grounded. The cathode of zener diode D3 serves as the OSSD feedback signal output terminal OSSD1_FB of the OSSD output circuit. A resistor R12 is also connected in parallel across the two ends of zener diode D3.

[0047] In a specific implementation, only when the positive OSSD control signal terminal SC1_1 of the MCU main control unit 500 is at a high level and the negative OSSD control signal terminal SC1_2 of the MCU main control unit 500 is at a low level, can the output terminal OSSD1 of the OSSD signal output the OSSD current signal, and the OSSD feedback signal output terminal OSSD1_FB can output the OSSD feedback signal. The ability to output the OSSD signal and the OSSD feedback signal indicates that this part of the electromagnetic door lock control circuit functions normally. The two identical OSSD output circuits are backup to each other. As long as one set can output normally, it indicates that the electromagnetic door lock control circuit works normally.

[0048] In some embodiments, refer to Figure 3, the safety input unit 200 includes two sets of safety input circuits with exactly the same structure. The safety input circuit includes a fuse F2, a TVS tube D4, resistors R13, R14, and an optocoupler U1. The first end of the fuse F2 serves as the input terminal SAFE_1 of the safety input circuit and is connected to the OSSD signal output terminal of the lower-level electromagnetic door lock. The second end of the fuse F2 is connected to the first end of the TVS tube D4 and the first end of the resistor R13. The second end of the TVS tube D4 is grounded. The second end of the resistor R13 is connected to the positive terminal of the emitter side of the optocoupler U1. The negative terminal of the emitter side of the optocoupler U1 is grounded. The resistor R14 is connected in parallel across both ends of the emitter side of the optocoupler U1. The positive terminal of the receiver side of the optocoupler U1 serves as the output terminal of the safety input circuit and is connected to the safety input signal receiving terminal SAFE_INPUT_1 of the MCU main control unit 500. The negative terminal of the receiver side of the optocoupler U1 is grounded.

[0049] In a specific implementation, when the safety input circuit of the lower-level electromagnetic door lock control circuit receives an OSSD current signal, the receiver side of the optocoupler U1 conducts, and the safety input signal receiving terminal SAFE_INPUT_1 of the MCU main control unit 500 is at a low level, indicating that the lower-level electromagnetic door lock control circuit functions normally. In other states, the receiver side of the optocoupler U1 is turned off, and the safety input signal receiving terminal SAFE_INPUT_1 of the MCU main control unit 500 is in a high-impedance state. The two identical safety input circuits respectively receive the input signals of two identical OSSD output circuits and are backup to each other. As long as one set can output normally, it indicates that the lower-level electromagnetic door lock control circuit works normally.

[0050] In some embodiments, refer to Figure 4 , the lock input unit 300 includes a fuse F3, a TVS tube D5, resistors R15, R16, and an optocoupler U2. The first end of the fuse F3 serves as the input terminal of the lock input unit 300 and is connected to the lock control terminal LOCK_IN of the host computer. The second end of the fuse F3 is connected to the first end of the TVS tube D5 and the first end of the resistor R15. The second end of the TVS tube D5 is grounded. The second end of the resistor R15 is connected to the positive terminal of the emitter side of the optocoupler U2. The negative terminal of the emitter side of the optocoupler U2 is grounded. The resistor R16 is connected in parallel across both ends of the emitter side of the optocoupler U2. The positive terminal of the receiver side of the optocoupler U2 serves as the output terminal of the lock input unit 300 and is connected to the lock input signal receiving terminal LOCK of the MCU main control unit 500. The negative terminal of the receiver side of the optocoupler U2 is grounded.

[0051] In a specific implementation, when the lock control terminal LOCK_IN of the host computer issues a high-level lock signal, the receiver side of the optocoupler U2 conducts, and the lock input signal receiving terminal LOCK of the MCU main control unit 500 is at a low level, indicating that the MCU main control unit 500 has received a lock signal from the host computer.

[0052] In some embodiments, refer to Figure 5, the electromagnet driving unit 400 includes a switching transistor Q5, a switching transistor Q6, a resistor R17, a resistor R18, a resistor R19, a capacitor C1, and a voltage stabilizing diode D6. The switching transistor Q5 is an NPN transistor, and the switching transistor Q6 is an NMOS transistor. The base of the switching transistor Q5 is connected to the electromagnet driving control terminal ETM_PWM of the MCU main control unit 500. The emitter of the switching transistor Q5 is grounded. The collector of the switching transistor Q5 is connected to the first end of the resistor R17. The second end of the resistor R17 is connected to the first DC power supply +24V through the resistor R18. The second end of the resistor R17 is also connected to the gate of the switching transistor Q6 through the resistor R19. The source of the switching transistor Q6 is grounded. A capacitor C1 is connected in parallel between the gate and the source of the switching transistor Q6. The drain of the switching transistor Q6 is connected to the first DC power supply +24V through the voltage stabilizing diode D6. Both ends of the voltage stabilizing diode D6 are connected to the electromagnet.

[0053] In a specific implementation, when the electromagnet driving control terminal ETM_PWM of the MCU main control unit 500 is at a high level, the switching transistor Q5 is turned on, and then the switching transistor Q6 is also turned on. The connected electromagnet obtains voltage from both ends of the voltage stabilizing diode D6 to generate an attractive force, and the electromagnetic door lock can be locked. When the electromagnet driving control terminal ETM_PWM of the MCU main control unit 500 is at a low level, the switching transistor Q5 is turned off, and then the switching transistor Q6 is also turned off. The anode of the voltage stabilizing diode D6 is in a high-impedance state, and there is no voltage at both ends of the electromagnet, so it does not work, and the electromagnetic door lock is not locked.

[0054] In a specific implementation, the MCU main control unit 500 is a microcontroller and its peripheral circuits.

[0055] In some embodiments, referring to Figure 6 , it further includes an LED display unit 700. Referring to Figure 7 , the LED display unit 700 includes multiple groups of identical LED display circuits. The LED display circuit includes a resistor R20 and a three-color LED module LED1. The anode of the three-color LED module LED1 is connected to the second DC power supply 3V3 through the resistor R20. The three cathodes of the three-color LED module LED1 are respectively connected to the red control terminal LED_R, the green control terminal LED_G, and the blue control terminal LED_B of the MCU main control unit 500.

[0056] In a specific implementation, the MCU main control unit 500 can indicate the current working state of the electromagnetic door lock, such as whether it is in a locked state and whether there is a fault, by controlling the display state of the three-color LED module LED1.

[0057] In some embodiments, referring to Figure 8, the power supply unit 600 includes a protection and filtering module 610, a voltage conversion module 620, a first DC power detection module 630, and a second DC power detection module 640; the external power adapter DC power VCC passes through the protection and filtering module 610 to obtain the first DC power +24V, and the first DC power +24V passes through the voltage conversion module 620 to obtain the second DC power 3V3. The first DC power detection module 630 is used to obtain the voltage of the first DC power +24V and transmit it to the MCU main control unit 500, and the second DC power detection module 640 is used to obtain the voltage of the second DC power 3V3 and transmit it to the MCU main control unit 500.

[0058] In some embodiments, referring to Figure 8 , the protection and filtering module 610 includes a common-mode inductor L1. One side of the common-mode inductor L1 is serially connected with a zener diode D8 and a self-recovery fuse F4. The cathode of the zener diode D8 is connected to the common-mode inductor L1, and the anode of the zener diode D8 is serially connected with the self-recovery fuse F4 and the external power adapter DC power VCC. It also includes a thermistor R21 and a TVS diode D7. One end of the thermistor R21 is connected between the zener diode D8 and the self-recovery fuse F4, and the other end is grounded. One end of the TVS diode D7 is connected between the zener diode D8 and the self-recovery fuse F4, and the other end is grounded.

[0059] The other side of the common-mode inductor L1 includes a capacitor C2, a capacitor C3, a capacitor C4, and a capacitor C5. One end of the capacitor C2 is connected between the common-mode inductor L1 and the first DC power +24V, and the other end is connected to the capacitor C3. The other end of the capacitor C3 is grounded. After the capacitor C4 and the capacitor C5 are connected in parallel, one end is connected to the first DC power +24V, and the other end is grounded.

[0060] In this embodiment, the TVS diode has high energy discharge ability and fast response time ability. When the power supply circuit has overvoltage or overcurrent, it can quickly conduct and ground, discharging the overvoltage or overcurrent instantaneously to the ground or reducing it to a safe range. The zener diode D8 realizes the stable regulation of the input voltage through the reverse breakdown effect. When the input voltage exceeds the set value, the zener diode D8 will automatically start to conduct and keep the output voltage at a relatively constant level. This can ensure that other devices supplied by the subsequent output power supply work properly. The multiple capacitors set can store and release energy and play a filtering role in the DC signal, removing the AC interference components and improving the stability of the device. The voltage value of the first DC power +24V is 24V.

[0061] In some embodiments, referring to Figure 8, the voltage conversion module 620 includes a power chip U7. A capacitor C6 is connected in series between the BST pin and the SW pin of the power chip U7. The feedback input pin FB is connected between a resistor R22 and a resistor R23. One end of the resistor R22 is connected to the 3.3V power supply 3V3_IN, and the other end is connected to the resistor R23. The other end of the resistor R23 is grounded. The SW pin of the power chip U7 is connected to the 3.3V power supply 3V3_IN through an inductor L2. A capacitor C7 and a capacitor C8 are connected in parallel between the 3.3V power supply 3V3_IN and the ground. The voltage across the inductor U8 is 3.3V. One end of a capacitor C9 is connected to one side of the inductor U8, and the other end is grounded. One end of a capacitor C10 is connected to the other side of the inductor U8, and the other end is grounded.

[0062] In the voltage conversion module 620, the BST pin of the power chip U7 is the Boost switch pin, which is used to control the switch of the boost converter. When the BST pin is at a high level, the boost converter works; when the BST pin is at a low level, the boost converter stops working. The FB pin of the power chip U7 is the feedback input pin, which is used to monitor the output voltage and perform feedback control. By sampling and comparing the FB pin, the output voltage of the boost converter can be adjusted to be stable at the set value. The SW pin of the power chip U7 is the switch pin, which plays a role in cutting off or conducting the power element during the buck-boost process. When the SW pin is used in cooperation with other components, the energy transmission and conversion functions can be realized. The VIN pin of the power chip U7 is the input power supply port, which receives the energy required for the chip to work provided by an external DC power supply. VIN can be connected to different types of energy sources such as a DC adapter and a lithium-ion battery. The voltage value of the second DC power supply 3V3 is 3.3V.

[0063] In some embodiments, refer to Figure 8 , the first DC power supply detection module 630 includes a resistor R25, a resistor R26, a resistor R27, and a capacitor C11. One end of the resistor R25 is connected to the first DC power supply +24V, and the other end is connected to the resistor R27. The other end of the fourth resistor R27 is grounded. The capacitor C11 is connected across the resistor R27. One end of the resistor R26 is connected between the resistor R25 and the resistor R27, and the other end is connected to the 24V voltage detection terminal 24_CHICK of the MCU main control unit 500.

[0064] In some embodiments, refer to Figure 8, the second DC power supply detection module 640 includes a resistor R28, a resistor R29, a resistor R30, and a capacitor C12. One end of the resistor R28 is connected to the second DC power supply 3V3, and the other end is connected to the resistor R30. The other end of the resistor R30 is grounded. The capacitor C12 is connected across the two ends of the resistor R30. One end of the resistor R29 is connected between the resistor R28 and the resistor R30, and the other end is connected to the 3.3V voltage detection terminal 3V3_CHECK of the MCU main control unit 500.

[0065] In a specific implementation, the first DC power supply detection module 630 and the second DC power supply detection module 640 are used to detect the voltage value in the power supply circuit and feedback it to the MCU main control unit 500, and can monitor two different working voltages simultaneously to ensure that the core control components of the electromagnetic door lock control circuit can work under normal working voltages.

[0066] The present utility model provides an embodiment of a cascaded electromagnetic door lock control system. Refer to Figure 9 , including a host computer and multiple groups of the above-mentioned electromagnetic door lock control circuit embodiments that can be cascaded. The locking control terminal of the host computer is connected to the locking input unit 300 of each group of electromagnetic door lock control circuits that can be cascaded. The door lock state detection terminal of the host computer is connected to the OSSD output unit 100 of the first-stage electromagnetic door lock control circuit that can be cascaded. The safety input unit 200 of each stage of the electromagnetic door lock control circuit that can be cascaded is connected to the OSSD output unit 100 of the next-stage electromagnetic door lock control circuit that can be cascaded.

[0067] The present utility model provides an embodiment of an electromagnetic door lock. The electromagnetic door lock is electrically connected to the above-mentioned electromagnetic door lock control circuit that can be cascaded, or is electrically connected to the above-mentioned cascaded electromagnetic door lock control system.

[0068] As an example, refer to Figure 10 , the electromagnetic door lock includes an electromagnetic main body 1 and a matcher 2. An electromagnet is provided in the electromagnetic main body 1, and the electromagnet is driven by the electromagnetic door lock control circuit to generate suction force.

[0069] The present utility model provides an embodiment of a production line. The above-mentioned cascaded electromagnetic door lock control system embodiment is provided on the production line, and the cascaded electromagnetic door lock control system is electrically connected to the above-mentioned electromagnetic door lock embodiment.

[0070] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used here have the same meaning as the general understanding of those of ordinary skill in the art in the field to which the present utility model belongs. It should also be understood that those terms defined in a general dictionary, such as those, should be understood as having a meaning consistent with the meaning in the context of the prior art, and will not be interpreted with an idealized or overly formal meaning unless specifically defined.

[0071] It should be noted that certain terms are used in this specification and the claims to refer to particular elements. Those skilled in the art should understand that different manufacturers and producers may use different terms to refer to the same element. This specification and the claims do not use the differences in terms as a way to distinguish elements, but rather use the differences in the functions of the elements as the criterion for distinction.

[0072] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as within the scope described in this specification.

[0073] In addition, those skilled in the art can understand that although some of the embodiments described herein include certain features included in other embodiments rather than other features, the combination of the features of different embodiments means that it is within the scope of the present utility model and forms different embodiments. For example: any one of the embodiments claimed in the claims can be used in any combination with the embodiments of the present utility model.

[0074] Those skilled in the art can understand that the modules in the devices in the embodiments can be adaptively changed and arranged in one or more devices different from the embodiments. The modules or units or components in the embodiments can be combined into one module or unit or component, and in addition, they can be divided into multiple sub-modules or sub-units or sub-components. Except that at least some of such features and / or processes or units are mutually exclusive, any combination can be used to combine all the features disclosed in this specification (including the corresponding claims, abstract and drawings) and all the processes or units of any method or device so disclosed. Unless otherwise explicitly stated, each feature disclosed in this specification (including the corresponding claims, abstract and drawings) can be replaced by an alternative feature that provides the same, equivalent or similar purpose.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and are not intended to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A cascadeable electromagnetic door lock control circuit, characterized in that: include: O An SSD output unit (100) is used to output an OSSD signal to an upper computer or an upper electromagnetic door lock according to an OSSD control signal; A safety input unit (200) is used to receive the OSSD signal of the lower electromagnetic door lock and convert it into a safety input signal; A locking input unit (300), used for receiving a locking signal from a host computer and converting it into a locking input signal; An electromagnet drive unit (400), used for converting a lock drive signal into a control level for the electromagnet suction force; The MCU main control unit (500) is respectively connected to the OSSD output unit (100), the safety input unit (200), the locking input unit (300) and the electromagnet drive unit (400), and is used to send the OSSD control signal to the OSSD output unit (100), receive the safety input signal of the safety input unit (200) and the locking input signal of the locking input unit (300), and send a locking driving signal to the electromagnet drive unit (400); as well as A power supply unit (600) is used to provide a first direct current power supply and a second direct current power supply (3V3) for the OSSD output unit (100), to provide a first direct current power supply for the electromagnet drive unit (400), and to provide a second direct current power supply (3V3) for the MCU main control unit (500).

2. The cascadeable electromagnetic door lock control circuit according to claim 1, characterized in that: The OSSD output unit (100) comprises two groups of OSSD output circuits with completely identical structures, wherein the OSSD output circuit comprises a first resistor (R1), a second resistor (R2), a third resistor (R3), a fourth resistor (R4), a fifth resistor (R5), a sixth resistor (R6), a seventh resistor (R7), an eighth resistor (R8), a ninth resistor (R9), a tenth resistor (R10), an eleventh resistor (R11), a twelfth resistor (R12), a first switch tube (Q1), a second switch tube (Q2), a third switch tube (Q3), a fourth switch tube (Q4), a first fuse (F1), a first voltage regulator tube (D1), a second voltage regulator tube (D2) and a third voltage regulator tube (D3), wherein the first switch tube The first switch tube (Q1) is an NPN transistor, the second switch tube (Q2) is a composite PNP transistor, the third switch tube (Q3) is an NPN transistor, and the fourth switch tube (Q4) is a composite NPN transistor. The positive OSSD control signal terminal (SC1_1) of the MCU main control unit (500) is connected to the second DC power supply through the first resistor (R1), and is connected to the base of the first switch tube (Q1) through the second resistor (R2). The collector of the first switch tube (Q1) is connected to the first DC power supply through the third resistor (R3), and is connected to the base of the second switch tube (Q2) through the fourth resistor (R4). The emitter of the first switch tube (Q1) is grounded, and the second The emitter of the switch tube (Q2) is connected to the first DC power supply through a fifth resistor (R5), the collector of the second switch tube (Q2) is connected to the first end of the first fuse (F1), the negative OSSD control signal end (SC1_2) of the MCU main control unit (500) is connected to the second DC power supply through the sixth resistor (R6), and is connected to the base of the third switch tube (Q3) through the seventh resistor (R7), the collector of the third switch tube (Q3) is connected to the first DC power supply through the eighth resistor (R8), and is connected to the base of the fourth switch tube (Q4) through the ninth resistor (R9), the emitter of the third switch tube (Q3) is grounded, and the emitter of the fourth switch tube (Q4) is connected to the first DC power supply through the eighth resistor (R8), and is connected to the base of the fourth switch tube (Q4) through the ninth resistor (R9). The tenth resistor (R10) is grounded, the collector of the fourth switch tube (Q4) is connected to the first end of the first fuse (F1), the second end of the first fuse (F1) serves as the output end (OSSD1) of the OSSD signal and is connected to the anode of the first voltage regulator tube (D1) and the cathode of the second voltage regulator tube (D2), the cathode of the first voltage regulator tube (D1) is connected to the first DC power supply, the anode of the second voltage regulator tube (D2) is grounded, the second end of the first fuse (F1) is also connected to the cathode of the third voltage regulator tube (D3) through the eleventh resistor (R11), the anode of the third voltage regulator tube (D3) is grounded, and the cathode of the third voltage regulator tube (D3) serves as the OSSD feedback signal output end of the OSSD output circuit,The two ends of the third voltage regulator tube (D3) are also connected in parallel with the twelfth resistor (R12).

3. The cascadeable electromagnetic door lock control circuit according to claim 1, characterized in that: The safety input unit (200) comprises two groups of safety input circuits with completely identical structures, wherein the safety input circuit comprises a second fuse (F2), a first TVS tube (D4), a thirteenth resistor (R13), a fourteenth resistor (R14) and a first optical coupler (U1), wherein a first end of the second fuse (F2) is connected to an OSSD signal output end of a lower-level electromagnetic door lock as a safety input circuit input end (SAFE_1), and a second end of the second fuse (F2) is connected to a first end of the first TVS tube (D4) and a thirteenth resistor ( The first end of the first TVS tube (D4) is connected to the ground, the second end of the thirteenth resistor (R13) is connected to the positive end of the transmitting side of the first optocoupler (U1), the negative end of the transmitting side of the first optocoupler (U1) is grounded, the fourteenth resistor (R14) is connected in parallel to the two ends of the transmitting side of the first optocoupler (U1), the positive end of the receiving side of the first optocoupler (U1) is connected to the safety input signal receiving end of the MCU main control unit (500) as the output end of the safety input circuit, and the negative end of the receiving side of the first optocoupler (U1) is grounded.

4. The cascadeable electromagnetic door lock control circuit according to claim 1, characterized in that: The locking input unit (300) comprises a third fuse (F3), a second TVS tube (D5), a fifteenth resistor (R15), a sixteenth resistor (R16) and a second optical coupler (U2); the first end of the third fuse (F3) is connected to the locking control end of the upper computer as the input end of the locking input unit (300); the second end of the third fuse (F3) is connected to the first end of the second TVS tube (D5) and the first end of the fifteenth resistor (R15); the second end of the second TVS tube (D5) is grounded; the second end of the fifteenth resistor (R15) is connected to the positive end of the transmitting side of the second optical coupler (U2); the negative end of the transmitting side of the second optical coupler (U2) is grounded; the sixteenth resistor (R16) is connected in parallel to the two ends of the transmitting side of the second optical coupler (U2); the positive end of the receiving side of the second optical coupler (U2) is connected to the locking input signal receiving end of the MCU main control unit (500) as the output end of the locking input unit (300); and the negative end of the receiving side of the second optical coupler (U2) is grounded.

5. The cascadeable electromagnetic door lock control circuit according to claim 1, characterized in that: The electromagnet drive unit (400) comprises a fifth switch tube (Q5), a sixth switch tube (Q6), a seventeenth resistor (R17), an eighteenth resistor (R18), a nineteenth resistor (R19), a first capacitor (C1) and a fourth voltage regulator tube (D6), wherein the fifth switch tube (Q5) is an NPN transistor, the sixth switch tube (Q6) is an NMOS tube, the base of the fifth switch tube (Q5) is connected to the electromagnet drive control terminal of the MCU main control unit (500), the emitter of the fifth switch tube (Q5) is grounded, and the collector of the fifth switch tube (Q5) is connected to the A first end of a seventeenth resistor (R17) and a second end of the seventeenth resistor (R17) are connected to the first DC power supply via the eighteenth resistor (R18); the second end of the seventeenth resistor (R17) is also connected to the gate of the sixth switch tube (Q6) via the nineteenth resistor (R19); the source of the sixth switch tube (Q6) is grounded; the first capacitor (C1) is connected in parallel between the gate and the source of the sixth switch tube (Q6); the drain of the sixth switch tube (Q6) is connected to the first DC power supply via the fourth voltage regulator tube (D6); and both ends of the fourth voltage regulator tube (D6) are connected to an electromagnet.

6. The cascadeable electromagnetic door lock control circuit according to claim 1, characterized in that: It also includes an LED display unit (700), the LED display unit (700) including a plurality of identical LED display circuits, the LED display circuit including a twentieth resistor (R20) and a three-color LED module (LED1), the anode of the three-color LED module (LED1) being connected to the second DC power supply (3V3) via the twentieth resistor (R20), and the three cathodes of the three-color LED module (LED1) being respectively connected to a red control terminal (LED_R), a green control terminal (LED_G) and a blue control terminal (LED_B) of the MCU main control unit (500).

7. The cascadeable electromagnetic door lock control circuit according to claim 1, characterized in that: The power supply unit (600) comprises a protection and filtering module (610), a voltage conversion module (620), a first DC power supply detection module (630) and a second DC power supply detection module (640); the DC power supply of the external power adapter passes through the protection and filtering module (610) to obtain the first DC power supply, and the first DC power supply passes through the voltage conversion module (620) to obtain the second DC power supply (3V3); the first DC power supply detection module (630) is used to obtain the first DC power supply voltage and transmit it to the MCU main control unit (500); and the second DC power supply detection module (640) is used to obtain the second DC power supply (3V3) voltage and transmit it to the MCU main control unit (500).

8. A cascade electromagnetic door lock control system, characterized in that: It comprises a host computer and a plurality of groups of cascadeable electromagnetic door lock control circuits as described in any one of claims 1 to 7, wherein the locking control terminal of the host computer is connected to the locking input unit (300) of each group of the cascadeable electromagnetic door lock control circuits, the door lock state detection terminal of the host computer is connected to the OSSD output unit (100) of the first-level cascadeable electromagnetic door lock control circuit, and the safety input unit (200) of each level of the cascadeable electromagnetic door lock control circuit is connected to the OSSD output unit (100) of the next-level cascadeable electromagnetic door lock control circuit.

9. An electromagnetic door lock, characterized in that: The electromagnetic door lock is electrically connected to the cascadeable electromagnetic door lock control circuit described in any one of claims 1 to 7, or is electrically connected to the cascaded electromagnetic door lock control system described in claim 8.

10. A production line, characterized in that: The production line is provided with the cascade electromagnetic door lock control system described in claim 8, and the cascade electromagnetic door lock control system is electrically connected to the electromagnetic door lock described in claim 9.

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