Driving control circuit, electromagnetic lock protection device and electromagnetic lock

Abstract

The invention discloses a driving control circuit, an electromagnetic lock protection device and an electromagnetic lock, and belongs to the technical field of power electronics. The driving control circuit comprises a conversion module, a control module and a driving module, the conversion module is connected with the control module and the driving module, the control module is connected with the driving module, and the driving module is connected with a coil of the electromagnetic lock; the conversion module is used for accessing an input voltage and converting the input voltage into a working voltage for the control module to use; the control module is used for being powered on and awakened under the condition that the working voltage is received, and outputting a first control signal to the driving module, so that the driving module provides input voltage for a coil of the electromagnetic lock; and the control module is also used for outputting a second control signal to the driving module when the distance from the output of the first control signal reaches a preset duration, so that the driving module stops providing the input voltage to the coil of the electromagnetic lock. The coil of the electromagnetic lock can be prevented from being electrified for a long time.

Description

Technical Field

[0001] The present application relates to the field of power electronics technology, and in particular to a drive control circuit, an electromagnetic lock protection device and an electromagnetic lock. Background Art

[0002] At present, during the use of electromagnetic locks, when the equipment is operated incorrectly and causes power outages in some circuits, or when the equipment fails and causes partial power outages, and the control program that controls the power on and off of the electromagnetic lock may be stuck or offline, the power supply of the equipment continues to provide power to the electromagnetic lock, causing the coil of the electromagnetic lock and the related electromagnetic lock control circuit to still be powered for a long time. Long-term power supply will cause the electromagnetic lock to be overloaded and damaged, posing a major safety hazard. During maintenance, the electromagnetic lock needs to be replaced as a whole, resulting in a large loss of time. Summary of the invention

[0003] The main purpose of the present application is to provide a drive control circuit, an electromagnetic lock protection device and an electromagnetic lock, aiming to solve the technical problem of how to prevent the coil of the electromagnetic lock from being damaged due to long-term power supply.

[0004] To achieve the above object, the present application provides a driving control circuit, which includes: a conversion module, a control module and a driving module; The conversion module is connected to the control module and the drive module respectively, the control module is connected to the drive module, and the drive module is connected to the coil of the electromagnetic lock; The conversion module is used to receive an input voltage and convert the input voltage into an operating voltage for use by the control module; The control module is used to power on and wake up when receiving the working voltage, and output a first control signal to the driving module so that the driving module provides the input voltage to the coil; The control module is further configured to output a second control signal to the driving module when a preset time has passed since the first control signal was output, so that the driving module stops providing the input voltage to the coil.

[0005] In one embodiment, the voltage range of the input voltage includes 4.75V to 40V; and / or, the voltage of the input voltage is 220V.

[0006] In one embodiment, the conversion module includes: an input unit, a voltage conversion chip and an output unit; The input unit is connected to the driving module and the voltage conversion chip respectively, the voltage conversion chip is connected to the output unit, and the output unit is connected to the control module.

[0007] In one embodiment, the input unit comprises: A transient voltage suppression diode, wherein a cathode of the transient voltage suppression diode is connected to the input voltage, and an anode of the transient voltage suppression diode is grounded; a first diode, wherein an anode of the first diode is connected to the input voltage, and a cathode of the first diode is connected to the driving module; a second diode, wherein an anode of the second diode is connected to the input voltage, and a cathode of the second diode is connected to an input terminal of the voltage conversion chip; an input capacitor, wherein a first end of the input capacitor is connected to the cathode of the second diode, and a second end of the input capacitor is grounded; A bypass capacitor connected in parallel with the input capacitor; A first resistor, wherein a first end of the first resistor is connected to an input end of the voltage conversion chip, and a second end of the first resistor is connected to an enable end of the voltage conversion chip.

[0008] In one embodiment, the output unit includes: A first capacitor, wherein a first end of the first capacitor is connected to a boost end of the voltage conversion chip; a third diode, wherein a cathode of the third diode is connected to the second end of the first capacitor, and an anode of the third diode is grounded; A first inductor, wherein a first end of the first inductor is connected to an output end of a power tube of the voltage conversion chip, and a second end of the first inductor is connected to the control module; a second capacitor, wherein a first end of the second capacitor is connected to the second end of the first inductor, and a second end of the second capacitor is grounded; a second resistor and a third resistor, wherein the first end of the second resistor is connected to the first end of the second capacitor, the second end of the second resistor is connected to the feedback end of the voltage conversion chip, the first end of the third resistor is connected to the second end of the second resistor, the second end of the third resistor is grounded, and the second resistor and the third resistor are used to adjust the voltage conversion ratio of the voltage conversion chip; a third capacitor, the third capacitor being connected in parallel with the second resistor; A fourth capacitor is connected in parallel with the second capacitor.

[0009] In one embodiment, the control module includes: A main control chip, wherein a power supply terminal of the main control chip is connected to the working voltage, a ground terminal of the main control chip is grounded, and a signal terminal of the main control chip is connected to the driving module; An external unit is connected to the main control chip and the conversion module respectively.

[0010] In one embodiment, the external unit includes: a fourth resistor, wherein a first end of the fourth resistor is connected to the conversion module to access the working voltage, and a second end of the fourth resistor is connected to a reset end of the main control chip; a fifth capacitor, wherein a first end of the fifth capacitor is connected to the second end of the fourth resistor, and a second end of the fifth capacitor is grounded; a sixth capacitor, wherein a first end of the sixth capacitor is connected to a power supply end of the main control chip, and a second end of the sixth capacitor is connected to a ground end of the main control chip; a seventh capacitor, the seventh capacitor being connected in parallel with the sixth capacitor; A burning interface, wherein a first end of the burning interface is connected to the working voltage, a second end of the burning interface is connected to a serial data receiving end of the main control chip, a third end of the burning interface is connected to a serial data sending end of the main control chip, and a fourth end of the burning interface is grounded.

[0011] In one embodiment, the driving module includes: a fourth diode, an anode of the fourth diode being connected to the control module; a fifth resistor, wherein a first end of the fifth resistor is connected to a cathode of the fourth diode; a sixth resistor, wherein a first end of the sixth resistor is connected to a second end of the fifth resistor, and a second end of the sixth resistor is grounded; a transistor, wherein a gate of the transistor is connected to the second end of the fifth resistor, and a source of the transistor is grounded; a fifth diode, wherein an anode of the fifth diode is connected to the drain of the transistor, a cathode of the fifth diode is connected to the conversion module to access the input voltage, and the fifth diode is connected in parallel with the coil; An energy storage capacitor, wherein a first end of the energy storage capacitor is connected to the cathode of the fifth diode, and a second end of the energy storage capacitor is grounded; A filter capacitor is connected in parallel with the energy storage capacitor.

[0012] In addition, to achieve the above-mentioned purpose, the present application also provides an electromagnetic lock protection device, the electromagnetic lock protection device comprises a first plug interface, a second plug interface and a driving control circuit as described above; The first plug interface is respectively connected to the pre-controller and the conversion module, and is used to provide the input voltage from the pre-controller to the drive control circuit; The second plug interface is arranged between the driving module and the coil, and is used to connect the driving module and the coil; The electromagnetic lock protection device is used to prevent the coil from being energized for a long time.

[0013] In addition, to achieve the above-mentioned purpose, the present application also provides an electromagnetic lock, which includes a coil and a drive control circuit as described above, wherein the drive control circuit is connected to the coil, and the drive control circuit is used to control the power on or off of the coil.

[0014] The present application proposes a driving control circuit, an electromagnetic lock protection device and an electromagnetic lock, which overcomes the problem that the control program is stuck or offline due to partial power outage or power failure of the equipment, thereby causing the coil of the electromagnetic lock to be energized for a long time. The driving control circuit includes: a conversion module, a control module and a driving module; the conversion module is connected to the control module and the driving module respectively, the control module is connected to the driving module, and the driving module is connected to the coil of the electromagnetic lock; the conversion module is used to access the input voltage and convert the input voltage into a working voltage for use by the control module; the control module is used to power on and wake up when receiving the working voltage, and output a first control signal to the driving module so that the driving module provides the input voltage to the coil of the electromagnetic lock; the control module is also used to output a second control signal to the driving module when the distance from the output of the first control signal reaches a preset time length, so that the driving module stops providing the input voltage to the coil of the electromagnetic lock.

[0015] The present application realizes the coordinated work of various modules in the above-mentioned drive control circuit, so that the coil of the electromagnetic lock can be de-energized after a certain period of time, and the coil of the electromagnetic lock can be effectively protected without human intervention, thereby avoiding a series of possible safety hazards caused by the long-term power supply of the coil of the electromagnetic lock; in addition, under the action of the conversion module, the input voltage of the electromagnetic lock using the drive control circuit is no longer limited to a small range, but can support a wide voltage input, so that it can be suitable for more application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0017] Figure 1 A schematic diagram of the structure of a drive control circuit provided in an embodiment of the present application; Figure 2 A schematic diagram of a structure of a conversion module after refinement in a drive control circuit provided in an embodiment of the present application; Figure 3 A schematic diagram of the circuit structure of an input unit involved in a drive control circuit provided in an embodiment of the present application; Figure 4A schematic diagram of the circuit structure of an output unit involved in a drive control circuit provided in an embodiment of the present application; Figure 5 A schematic diagram of the circuit structure of a conversion module involved in a drive control circuit provided in an embodiment of the present application; Figure 6 A schematic diagram of a structure of a control module after refinement in a drive control circuit provided in an embodiment of the present application; Figure 7 A schematic diagram of the circuit structure of a control module involved in a drive control circuit provided in an embodiment of the present application; Figure 8 A schematic diagram of the circuit structure of a driving module involved in a driving control circuit provided in an embodiment of the present application; Fig. 9 A schematic diagram of the structure of an electromagnetic lock protection device provided in an embodiment of the present application.

[0018] The realization of the purpose, functional features and advantages of the embodiments of the present application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0019] Description of Figure Numbers: 100, conversion module; 200, control module; 300, drive module; 101, input unit; 102, voltage conversion chip; 103, output unit; D0, transient voltage suppression diode; D1, first diode; D2, second diode; Ci, input capacitor; Cp, bypass capacitor; R1, first resistor; C1, first capacitor; D3, third diode; L1, first inductor; C2, second capacitor; R2, second resistor; R3, third resistor; C3, third capacitor; C4, fourth capacitor; 201, main control chip; 202, external unit; R4, fourth resistor; C5, fifth capacitor; C6, sixth capacitor; C7, seventh capacitor; D4, fourth diode; R5, fifth resistor; R6, sixth resistor; Q1, transistor; D5, fifth diode; C8, energy storage capacitor; C9, filter capacitor; 10, first plug interface; 20, second plug interface. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the embodiments of the present application.

[0021] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0022] In addition, in the embodiments of the present application, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the embodiments of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In addition, the meaning of "and / or" appearing in the full text is to include three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B.

[0023] In the embodiments of the present application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" 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 the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0024] It should also be understood that the references to "one embodiment" or "some embodiments" described in the specification of the embodiments of the present application mean that one or more embodiments of the embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0025] At present, during the use of electromagnetic locks, when there is a partial power outage in the equipment or a partial power outage caused by equipment failure, the control program that controls the power on and off of the electromagnetic lock may become stuck or offline, causing the power supply of the equipment to continue to provide power to the electromagnetic lock, resulting in the coil of the electromagnetic lock and the related electromagnetic lock control circuit still being powered for a long time. Long-term power supply will cause the electromagnetic lock to be overloaded and damaged, posing a major safety hazard. During maintenance, the electromagnetic lock needs to be replaced as a whole, resulting in a large loss of time.

[0026] Based on this, an embodiment of the present application provides a drive control circuit, an electromagnetic lock protection device and an electromagnetic lock, and the drive control circuit includes: a conversion module, a control module and a drive module; the embodiment of the present application enables the coil of the electromagnetic lock to be powered off after a certain period of time through the coordinated work of the modules in the drive control circuit, and effectively protects the coil of the electromagnetic lock without human intervention, thereby avoiding a series of possible safety hazards caused by the long-term power supply of the coil of the electromagnetic lock; in addition, under the action of the conversion module, the input voltage of the electromagnetic lock using the drive control circuit is no longer limited to a small range, but can support a wide voltage input, so that it can be suitable for more application scenarios.

[0027] The drive control circuit, electromagnetic lock protection device and electromagnetic lock provided in the embodiments of the present application are specifically described through the following embodiments. First, the drive control circuit in the embodiments of the present application is described.

[0028] The present application embodiment provides a driving control circuit, referring to Figure 1 , Figure 1 A schematic diagram of a drive control circuit provided in an embodiment of the present application, the drive control circuit is used to protect an electromagnetic lock, and includes: a conversion module 100, a control module 200 and a drive module 300; The conversion module 100 is connected to the control module 200 and the drive module 300 respectively, the control module 200 is connected to the drive module 300, and the drive module 300 is connected to the coil of the electromagnetic lock; The conversion module 100 is used to receive an input voltage and convert the input voltage into an operating voltage for use by the control module 200; The control module 200 is used to power on and wake up when receiving the working voltage, and output a first control signal to the driving module 300 so that the driving module 300 provides an input voltage to the coil; The control module 200 is further configured to output a second control signal to the driving module 300 when a preset time has passed since the first control signal was output, so that the driving module 300 stops providing input voltage to the coil.

[0029] In this embodiment, in order to overcome the situation that the existing electromagnetic lock may be powered on for a long time due to the control program that controls the power on and off of the electromagnetic lock being stuck or offline, the above-mentioned drive control circuit is added between the front-end device that provides input voltage to the electromagnetic lock and the electromagnetic lock. In this way, when the front-end device supplies input voltage, it can be converted into working voltage through the conversion module 100 to wake up the control module 200. After the control module 200 is powered on and woken up, it will first control the drive module 300 to be turned on through the first control signal, so that the input voltage can be provided to the coil of the electromagnetic lock, and after the first control signal is sent at intervals for a preset time, the drive module 300 is controlled to be turned off through the second control signal, so that the coil is no longer powered on. Among them, the preset time can be configured through the timer in the control module 200, and the specific value can be determined according to actual needs. As long as it is ensured that the coil of the electromagnetic lock will not burn out after being continuously powered on for the preset time, this embodiment does not limit this.

[0030] It should be noted that, in the present embodiment, the working voltage is simultaneously supplied to the power input terminal and the reset terminal of the control module 200. That is to say, the first control signal is generated when the control module 200 receives the working voltage for the first time after power failure, is powered on and awakened, and is reset. In this way, even if the input voltage is continuously supplied due to an abnormality in the front-end device, the coil will not be continuously powered on for a long time. This is because when the input voltage is continuously supplied, the control module 200 can also continue to be in a working state based on the working voltage converted from the input voltage. In the absence of other interference, the first control signal triggered by the power-on wake-up and reset cannot be output again, and the coil will not be powered on again after power failure.

[0031] In this embodiment, the first control signal and the second control signal may be instantaneous signals or continuously output level state signals, which may be determined according to actual needs and specific circuit design, and this embodiment does not impose any limitation on this.

[0032] In some feasible embodiments, the voltage value range of the input voltage includes 4.75V to 40V.

[0033] In some feasible embodiments, the voltage value of the above input voltage can also be set to 220 volts.

[0034] In this embodiment, the drive control circuit can be used to protect electromagnetic locks with an input voltage range of 4.75V~40V. Since the commonly used electromagnetic locks generally use an input voltage of 12V or 24V, it can be suitable for most usage scenarios; in addition, the drive control circuit can also be used to protect electromagnetic locks with an input voltage of 220V (just an example, other larger voltage values ​​may also be used), which may be used in certain heavy industry fields (or other fields that require a larger voltage to drive the electromagnetic lock); for the above two types of application scenarios, when constructing the corresponding drive control circuit, the specific electrical components selected will be different.

[0035] As an example, when the operating voltage of the control module 200 is 5V, the conversion module 100 can convert an input voltage of 4.75V to 40V or an input voltage of 220V into an operating voltage of 5V to power on and wake up the control module 200.

[0036] Reference Figure 2 In some feasible embodiments, the conversion module 100 may include: an input unit 101, a voltage conversion chip 102 and an output unit 103; The input unit 101 is connected to the driving module 300 and the voltage conversion chip 102 respectively, the voltage conversion chip 102 is connected to the output unit 103 , and the output unit 103 is connected to the control module 200 .

[0037] In this embodiment, the above-mentioned conversion module 100 can be a DC-DC (direct current-to-direct current) voltage conversion circuit for converting an input voltage into an operating voltage, which can be composed of three parts, namely an input unit 101 for connecting to the input voltage, a voltage conversion chip 102 for processing the input voltage, and an output unit 103 for adjusting the ratio so that the output voltage is the operating voltage.

[0038] As an example, the voltage conversion chip 102 can adopt a ME3116AM6G step-down DC-DC power supply chip. The ME3116AM6G is an asynchronous rectifier step-down regulator with an internally integrated MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor), and also has functions such as over-temperature shutdown, input under-voltage protection, BS under-voltage protection and short-circuit protection.

[0039] Reference Figure 3 In some feasible embodiments, the input unit 101 may include: A transient voltage suppression diode D0, wherein the cathode of the transient voltage suppression diode D0 is connected to the input voltage Vin, and the anode of the transient voltage suppression diode D0 is grounded; A first diode D1, wherein an anode of the first diode D1 is connected to the input voltage Vin, and a cathode of the first diode D1 is connected to the driving module 300; A second diode D2, wherein an anode of the second diode D2 is connected to the input voltage Vin, and a cathode of the second diode D2 is connected to an input terminal of the voltage conversion chip 102; An input capacitor Ci, a first end of the input capacitor Ci is connected to the cathode of the second diode D2, and a second end of the input capacitor Ci is grounded; Bypass capacitor Cp, bypass capacitor Cp is connected in parallel with input capacitor Ci; A first resistor R1 , wherein a first end of the first resistor R1 is connected to an input end IN of the voltage conversion chip 102 , and a second end of the first resistor R1 is connected to an enable end EN of the voltage conversion chip 102 .

[0040] In this embodiment, a TVS (Transient Voltage Suppressor) diode D0 is connected in parallel at the entrance of the input voltage Vin, which has surge absorption capability and is used for lightning overvoltage protection, and can protect the subsequent circuit; and the first diode D1 and the second diode D2 can be Schottky diodes. When the voltage is reversed, the current flowing through D1 and D2 is zero, thereby protecting the driving module 300 and the subsequent circuit; it should be understood that Figure 3 The voltage values ​​of +Vin, +VinDL and +VinDC are basically the same and are only used to distinguish different positions in the circuit; the input capacitor Ci connected between +VinDL and ground can be a ceramic capacitor, which can block larger transient input voltages. Its capacitance value depends on the structure. Under rated voltage, the ceramic capacitor value can be reduced to 50% of its rated value; the bypass capacitor Cp connected in parallel with the input capacitor Ci can also be a ceramic capacitor, which is used to filter out high-frequency noise on the power supply, so that the input power supply of the voltage conversion chip 102 can avoid noise interference.

[0041] As an example, in this embodiment, the specification of the input capacitor Ci may be 22uF, the specification of the bypass capacitor Cp may be 100nF, and the specification of the first resistor R1 may be 1MΩ.

[0042] Reference Figure 4 In some feasible embodiments, the output unit 103 may include: A first capacitor C1, a first end of the first capacitor C1 is connected to the boost terminal BS of the voltage conversion chip 102; a third diode D3, wherein a cathode of the third diode D3 is connected to the second end of the first capacitor C1, and an anode of the third diode D3 is grounded; A first inductor L1, a first end of the first inductor L1 is connected to the power tube output end SW of the voltage conversion chip 102, and a second end of the first inductor L1 is connected to the control module 200; A second capacitor C2, a first end of the second capacitor C2 is connected to the second end of the first inductor L1, and a second end of the second capacitor C2 is grounded; A second resistor R2 and a third resistor R3, wherein a first end of the second resistor R2 is connected to a first end of the second capacitor C2, a second end of the second resistor R2 is connected to a feedback end FB of the voltage conversion chip 102, a first end of the third resistor R3 is connected to a second end of the second resistor R2, a second end of the third resistor R3 is grounded, and the second resistor R2 and the third resistor R3 are used to adjust the voltage conversion ratio of the voltage conversion chip 102; A third capacitor C3, the third capacitor C3 is connected in parallel with the second resistor R2; The fourth capacitor C4 is connected in parallel with the second capacitor C2.

[0043] In this embodiment, the voltage conversion ratio of the voltage conversion chip 102 can be adjusted by changing the specifications of the second resistor R2 and the third resistor R3; the second capacitor C2 and the fourth capacitor C4 are both filter capacitors for reducing high-frequency interference; the third capacitor C3 is a feedforward capacitor for improving the loop transient response.

[0044] As an example, in this embodiment, the specifications of the first capacitor C1, the second capacitor C2 and the fourth capacitor C4 can be 100nF, the specification of the first inductor L1 can be 10uH, the specification of the third capacitor C3 can be 47pF, the specification of the second resistor R2 can be 51KΩ, and the specification of the third resistor R3 can be 9.53KΩ.

[0045] In this embodiment, the above Figure 3 and Figure 4 By integrating, we can get Figure 5 A detailed circuit structure diagram of the conversion module 100 is shown.

[0046] Reference Figure 6 In some feasible embodiments, the control module 200 may include: A main control chip 201, the main control chip 201 is connected to the driving module 300; The external unit 202 is connected to the main control chip 201 and the conversion module 100 respectively.

[0047] In this embodiment, combined with the above-mentioned embodiments, it can be known that the conversion module 100 can convert the input voltage into a 5V working voltage supplied to the control module 200, so that the main control chip 201 in the control module 200 can be powered on and awakened based on the working voltage and execute the action of outputting the first control signal.

[0048] As an example, the main control chip 201 can use an ultra-low power STC8G1K17-38I microcontroller, which includes a high-performance Arm® Cortex®-M0+ 32-bit RISC core with an operating frequency of 32MHz, as well as high-speed embedded memory (16KB flash program memory, 128 bytes of data EEPROM and 2KB RAM) and a wide range of enhanced I / O (input / output) and peripherals.

[0049] Reference Figure 7 In some feasible embodiments, the power supply terminal VCC of the main control chip 201 is connected to the working voltage, the ground terminal GND of the main control chip 201 is grounded, and the signal terminal ST_DL1 of the main control chip 201 is connected to the driving module 300; the external unit 202 may include: A fourth resistor R4, wherein a first end of the fourth resistor R4 is connected to the conversion module 100 to access the working voltage, and a second end of the fourth resistor R4 is connected to a reset end of the main control chip 201; a fifth capacitor C5, wherein a first end of the fifth capacitor C5 is connected to a second end of the fourth resistor R4, and a second end of the fifth capacitor C5 is grounded; A sixth capacitor C6, wherein a first end of the sixth capacitor C6 is connected to a power supply end of the main control chip 201, and a second end of the sixth capacitor C6 is connected to a ground end of the main control chip 201; A seventh capacitor C7, the seventh capacitor C7 is connected in parallel with the sixth capacitor C6; The burning interface, the first end of the burning interface is connected to the working voltage, the second end of the burning interface is connected to the serial data receiving end RXD of the main control chip 201, the third end of the burning interface is connected to the serial data sending end TXD of the main control chip 201, and the fourth end of the burning interface is grounded.

[0050] In this embodiment, the sixth capacitor C6 and the seventh capacitor C7 can be decoupling capacitors for removing power supply noise and improving anti-interference ability; the burning interface can enable an external device to be connected to the main control chip 201, thereby changing the internal timer configuration of the main control chip 201, and then changing the preset duration of the interval between the control module 200 sending the first control signal and the second control signal to the driving module 300.

[0051] As an example, in this embodiment, the specification of the fourth resistor R4 may be 10KΩ, the specifications of the fifth capacitor C5 and the seventh capacitor C7 may be 100nF, and the specification of the sixth capacitor C6 may be 22uF.

[0052] Reference Figure 8 In some feasible embodiments, the driving module 300 may include: a fourth diode D4, wherein an anode of the fourth diode D4 is connected to the control module 200; a fifth resistor R5, wherein a first end of the fifth resistor R5 is connected to a cathode of the fourth diode D4; a sixth resistor R6, wherein a first end of the sixth resistor R6 is connected to a second end of the fifth resistor R5, and a second end of the sixth resistor R6 is grounded; a transistor Q1, wherein a gate of the transistor Q1 is connected to a second end of a fifth resistor R5, and a source of the transistor Q1 is grounded; a fifth diode D5, wherein an anode of the fifth diode D5 is connected to the drain of the transistor, a cathode of the fifth diode D5 is connected to the conversion module 100 to access the input voltage, and the fifth diode D5 is connected in parallel with the coil; An energy storage capacitor C8, wherein a first end of the energy storage capacitor C8 is connected to the cathode of the fifth diode D5, and a second end of the energy storage capacitor C8 is grounded; Filter capacitor C9, filter capacitor C9 is connected in parallel with energy storage capacitor C8.

[0053] In this embodiment, the fourth diode D4 can be a fast switching diode, which can prevent a large current from entering the control module 200 due to damage to the transistor Q1, thereby protecting the control module 200; the fifth resistor R5 can be a current limiting resistor, which prevents excessive current from burning the transistor Q1; the sixth resistor R6 can assist the transistor Q1 in confirming the gate level to prevent interference from uncertain levels; the role of the fifth diode D5 connected in parallel at both ends of the coil is: when the current flowing through the coil disappears, the induced electromotive force generated by the coil is consumed by the work done by the loop formed by the fifth diode D5 and the coil, thereby protecting the safety of other components in the circuit and avoiding losses.

[0054] As an example, in this embodiment, the specification of the fifth resistor R5 may be 510Ω, the specification of the sixth resistor R6 may be 100KΩ, the specification of the energy storage capacitor C8 may be 100uF / 35V, and the specification of the filter capacitor C9 may be 100nF.

[0055] As an example, in this embodiment, transistor Q1 can be an NMOS tube, the first control signal can be a high level, and the second control signal can be a low level. When the control module 200 is powered on and wakes up and outputs a high-level first control signal, the NMOS tube Q1 is turned on, so that the coil of the electromagnetic lock is energized, and the electromagnetic lock is unlocked. At the same time, the timer in the control module 200 is triggered. After the timer reaches the time, an interrupt is triggered, and the control module 200 outputs a low-level second control signal, which directly pulls down the gate level of the NMOS tube Q1, and the NMOS tube Q1 is turned off, the coil of the electromagnetic lock is powered off, and the electromagnetic lock is locked.

[0056] It is understandable that, when the transistor Q1 is replaced by another type of switch device from an NMOS tube, the first control signal and the second control signal can also be flexibly adjusted accordingly.

[0057] This embodiment provides a drive control circuit, which realizes effective protection of electromagnetic locks by integrating three major functional modules, can prevent the coil of the electromagnetic lock from being burned out due to long-term power-on and thus causing a power short circuit, and reduces safety hazards. The DC-DC conversion circuit after the conversion module is unfolded can enable electromagnetic locks between 4.75V and 40V (most electromagnets on the market) to be protected by the drive control circuit; the control module uses an MCU microcontroller, which has strong functionality and can be customized according to user needs, such as setting power-on and power-off time functions. It can be seen that the drive control circuit has many advantages such as small size, wide voltage input, high stability, long life, strong reliability, low power consumption, low cost, and convenience for large-scale production, providing a practical and feasible preferred solution for protecting electromagnetic locks.

[0058] In addition, the present application also provides an electromagnetic lock protection device, referring to Fig. 9 The electromagnetic lock protection device is used to prevent the coil from being energized for a long time, and includes a first plug interface 10, a second plug interface 20 and a drive control circuit proposed in the above embodiment; The first plug interface 10 is connected to the pre-controller and the conversion module 100 respectively, and is used to provide the input voltage from the pre-controller to the drive control circuit; The second plug-in port 20 is disposed between the driving module 300 and the coil, and is used to connect the driving module 300 and the coil.

[0059] In this embodiment, the drive control circuit proposed in the above embodiment can be encapsulated in an electromagnetic lock protection device having a first plug interface 10 and a second plug interface 20, so as to configure the electromagnetic lock protection device for the electromagnetic lock that needs to be protected, that is, the original connection method of the front controller directly connecting the coil of the electromagnetic lock is changed, and the electromagnetic lock protection device is connected between the front controller and the coil of the electromagnetic lock, so as to avoid the coil being energized for a long time, and overcome the problem that the control program is stuck or offline due to partial power outage or power failure of the equipment, thereby causing the coil of the electromagnetic lock to be energized for a long time.

[0060] In this embodiment, the first plug-in interface 10 and the second plug-in interface 20 can be configured as common circuit plug-in modules.

[0061] As an example, in this embodiment, the pre-controller can be a relay controller connected to a motion control board connected to a power supply, or a combination of a motion control board and a relay controller connected to a power supply, or other devices or device combinations that can provide a stable input voltage for the coil of the electromagnetic lock, and this embodiment is not limited to this.

[0062] Those skilled in the art will understand that Fig. 9 The structure shown in the figure does not constitute a limitation on the electromagnetic lock protection device, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0063] The electromagnetic lock protection device proposed in this embodiment and the drive control circuit proposed in the above embodiment belong to the same technical concept. The technical details not fully described in this embodiment can be referred to any of the above embodiments, and this embodiment has the same beneficial effects as the above drive control circuit embodiments.

[0064] In addition, an embodiment of the present application also provides an electromagnetic lock, which includes a coil and the drive control circuit provided in the above embodiment.

[0065] The electromagnetic lock proposed in this embodiment and the drive control circuit proposed in the above embodiments belong to the same technical concept. The technical details not fully described in this embodiment can be referred to any of the above embodiments, and this embodiment has the same beneficial effects as the above drive control circuit embodiments.

[0066] It should be noted that the technical solutions of the various embodiments of the embodiments of the present application can be combined with each other, but it must be based on the fact that they can be implemented by technical personnel in this field. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the embodiments of the present application.

[0067] The above are only optional embodiments of the embodiments of the present application, and do not limit the patent scope of the embodiments of the present application. Any equivalent structure or equivalent process transformation made using the description and drawings of the embodiments of the present application, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the embodiments of the present application.

Claims

1. A drive control circuit for protecting an electromagnetic lock, characterized in that: The drive control circuit comprises: a conversion module, a control module and a drive module; The conversion module is connected to the control module and the drive module respectively, the control module is connected to the drive module, and the drive module is connected to the coil of the electromagnetic lock; The conversion module is used to receive an input voltage and convert the input voltage into an operating voltage for use by the control module; The control module is used to power on and wake up when receiving the working voltage, and output a first control signal to the driving module so that the driving module provides the input voltage to the coil; The control module is further configured to output a second control signal to the driving module when a preset time has passed since the first control signal was output, so that the driving module stops providing the input voltage to the coil.

2. The drive control circuit according to claim 1, characterized in that: The input voltage has a voltage range of 4.75 volts to 40 volts; And / or, the input voltage is 220 volts.

3. The drive control circuit according to claim 1, characterized in that: The conversion module includes: an input unit, a voltage conversion chip and an output unit; The input unit is connected to the driving module and the voltage conversion chip respectively, the voltage conversion chip is connected to the output unit, and the output unit is connected to the control module.

4. The drive control circuit according to claim 3, characterized in that: The input unit comprises: A transient voltage suppression diode, wherein a cathode of the transient voltage suppression diode is connected to the input voltage, and an anode of the transient voltage suppression diode is grounded; a first diode, wherein an anode of the first diode is connected to the input voltage, and a cathode of the first diode is connected to the driving module; a second diode, wherein an anode of the second diode is connected to the input voltage, and a cathode of the second diode is connected to an input terminal of the voltage conversion chip; an input capacitor, wherein a first end of the input capacitor is connected to the cathode of the second diode, and a second end of the input capacitor is grounded; A bypass capacitor connected in parallel with the input capacitor; A first resistor, wherein a first end of the first resistor is connected to an input end of the voltage conversion chip, and a second end of the first resistor is connected to an enable end of the voltage conversion chip.

5. The drive control circuit according to claim 3, characterized in that: The output unit comprises: A first capacitor, wherein a first end of the first capacitor is connected to a boost end of the voltage conversion chip; a third diode, wherein a cathode of the third diode is connected to the second end of the first capacitor, and an anode of the third diode is grounded; A first inductor, wherein a first end of the first inductor is connected to an output end of a power tube of the voltage conversion chip, and a second end of the first inductor is connected to the control module; a second capacitor, wherein a first end of the second capacitor is connected to the second end of the first inductor, and a second end of the second capacitor is grounded; a second resistor and a third resistor, wherein the first end of the second resistor is connected to the first end of the second capacitor, the second end of the second resistor is connected to the feedback end of the voltage conversion chip, the first end of the third resistor is connected to the second end of the second resistor, the second end of the third resistor is grounded, and the second resistor and the third resistor are used to adjust the voltage conversion ratio of the voltage conversion chip; a third capacitor, the third capacitor being connected in parallel with the second resistor; A fourth capacitor is connected in parallel with the second capacitor.

6. The drive control circuit according to claim 1, characterized in that: The control module comprises: A main control chip, wherein a power supply terminal of the main control chip is connected to the working voltage, a ground terminal of the main control chip is grounded, and a signal terminal of the main control chip is connected to the driving module; An external unit is connected to the main control chip and the conversion module respectively.

7. The drive control circuit according to claim 6, characterized in that: The external unit comprises: a fourth resistor, wherein a first end of the fourth resistor is connected to the conversion module to access the working voltage, and a second end of the fourth resistor is connected to a reset end of the main control chip; a fifth capacitor, wherein a first end of the fifth capacitor is connected to the second end of the fourth resistor, and a second end of the fifth capacitor is grounded; a sixth capacitor, wherein a first end of the sixth capacitor is connected to a power supply end of the main control chip, and a second end of the sixth capacitor is connected to a ground end of the main control chip; a seventh capacitor, the seventh capacitor being connected in parallel with the sixth capacitor; A burning interface, wherein a first end of the burning interface is connected to the working voltage, a second end of the burning interface is connected to a serial data receiving end of the main control chip, a third end of the burning interface is connected to a serial data sending end of the main control chip, and a fourth end of the burning interface is grounded.

8. The drive control circuit according to claim 1, characterized in that: The driving module comprises: a fourth diode, an anode of the fourth diode being connected to the control module; a fifth resistor, wherein a first end of the fifth resistor is connected to a cathode of the fourth diode; a sixth resistor, wherein a first end of the sixth resistor is connected to a second end of the fifth resistor, and a second end of the sixth resistor is grounded; a transistor, wherein a gate of the transistor is connected to the second end of the fifth resistor, and a source of the transistor is grounded; a fifth diode, wherein an anode of the fifth diode is connected to the drain of the transistor, a cathode of the fifth diode is connected to the conversion module to access the input voltage, and the fifth diode is connected in parallel with the coil; An energy storage capacitor, wherein a first end of the energy storage capacitor is connected to the cathode of the fifth diode, and a second end of the energy storage capacitor is grounded; A filter capacitor is connected in parallel with the energy storage capacitor.

9. An electromagnetic lock protection device, characterized in that: The electromagnetic lock protection device comprises a first plug interface, a second plug interface and a drive control circuit as described in any one of claims 1 to 8; The first plug interface is respectively connected to the pre-controller and the conversion module, and is used to provide the input voltage from the pre-controller to the drive control circuit; The second plug interface is arranged between the driving module and the coil, and is used to connect the driving module and the coil; The electromagnetic lock protection device is used to prevent the coil from being energized for a long time.

10. An electromagnetic lock, characterized in that: The electromagnetic lock comprises a coil and a drive control circuit as claimed in any one of claims 1 to 8, wherein the drive control circuit is connected to the coil and is used to control the coil to be energized or deenergized.

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