Door status detection circuit for access control system

Abstract

The invention discloses a door state detection circuit of an access control system, comprising a detection element H, which is used for detecting the state of a door; a door lock is powered by a power supply, and contacts of a relay SS1 are arranged between the door lock and the power supply; a coil of the relay SS1 is connected to a host M, and the host M controls whether the coil of the relay SS1 is energized; a signal receiving end of the host M is also connected to contacts of a relay XS1, which controls whether a process state signal indicating that the door has been opened and then closed is sent to the host M; contacts of the detection element H control whether a coil of a relay HS is turned on; contacts of the relay HS control whether a coil of a relay YS1 is turned on; contacts of relay HS2 and contacts of relay YS1 control whether a coil of a relay XS1 is turned on; relay YS1 is a time delay relay, and contacts of the relay YS1 are normally closed contacts; and contacts of other relays are normally open contacts.

Description

Technical Field

[0001] The present invention relates to the field of security technology, and in particular to a door status detection circuit of an access control system. Background Art

[0002] With the development of economy and the progress of society, the development of security equipment has become one of the essential projects for building safe and harmonious communities. Among them, the requirements for door status detection in access control systems are getting higher and higher, because the door status detection directly affects the judgment of the system information by the Internet of Things system. Therefore, a comprehensive door status detection system has become an indispensable and important part of the Internet of Things access control system.

[0003] The usual door detection system is composed of a single door magnetic element. Although it can meet certain status detection requirements, its detection scheme is static and cannot meet the needs of modern remote door status control. Summary of the invention

[0004] The purpose of the present invention is to provide a door status detection circuit for an access control system in view of the problems existing in the prior art. The detection circuit mainly meets the requirements of Internet of Things access control security, that is, the entire detection circuit is required to be able to establish a connection with the security camera opening and closing control.

[0005] The door state detection circuit of the access control system includes a detection element H, and the detection element H is used to detect the state of the door;

[0006] The door lock is powered by a power supply, and a contact of a relay SS1 is provided between the door lock and the power supply; the coil of the relay SS1 is connected to the host M, and the host M controls whether the coil of the relay SS1 is energized;

[0007] The signal receiving end of the host M is also connected to the contact of the relay XS1 to control whether to send a process status signal of the door being opened and then closed to the host M;

[0008] The contact of detection element H controls whether the coil of relay HS is conductive; the contact of relay HS controls whether the coil of relay YS1 is conductive; the contact of relay HS2 and the contact of relay YS1 control whether the coil of relay XS1 is conductive.

[0009] As a preferred technical solution, there are two detection elements H, namely detection element H1 and detection element H2, which are used to detect the states of door 1 and door 2 respectively; there are two relays HS, namely relay HS1 and relay HS2;

[0010] The door locks LOCK1 and LOCK2 on the door 1 and the door 2 are powered by a power supply, and contacts of a relay SS1 are provided between the door locks LOCK1 and LOCK2 and the power supply;

[0011] The contacts of the detection element H1 and the detection element H2 respectively control whether the relay HS1 coil and the relay HS2 coil are conductive; the relay HS1 contact and the relay HS2 contact control whether the relay YS1 coil is conductive; the relay HS1 contact, the relay HS2 contact and the relay YS1 contact control whether the relay coil XS1 is conductive.

[0012] As a preferred technical solution, two ends of the power supply are connected to two ends of the receiver of the detection element H1 and the receiver of the detection element H2; one end of the power supply is also connected to one end of the relay HS1 coil, one end of the relay HS1 contact, and one end of the relay HS2 coil; the other end of the power supply is connected to one end of the detection element H1 contact, one end of the relay YS1 contact, one end of the relay YS1 coil, and one end of the detection element H2 contact; the other end of the relay HS1 coil is connected to the other end of the detection element H1 contact; the other end of the relay HS1 contact is connected to one end of the relay HS2 contact; the other end of the relay HS2 contact is connected to the other end of the relay YS1 coil and one end of the relay XS1 coil; the other end of the relay XS1 coil is connected to the other end of the relay YS1 contact; the other end of the relay HS2 coil is connected to the other end of the detection element H2 contact;

[0013] As a preferred technical solution, the power supply is also connected to both ends of the heat dissipating fan.

[0014] As a preferred technical solution, a cut-off end is provided between the other end of the contact of relay HS1 and the other end of the contact of relay HS2.

[0015] As a preferred technical solution, it also includes a time delay relay HYS, and the coil of the time delay relay HYS is connected in parallel with the door lock LOCK1 and the door lock LOCK2;

[0016] The other end of the contact of relay HS2 is connected to one end of the coil of relay XS1 and the other end of the coil of relay YS1 through the contact of time delay relay HYS, and the contact of time delay relay HYS is a normally closed contact.

[0017] As a preferred technical solution, it also includes relay HS3 and relay HS4; one end of the coil of relay HS3 is respectively connected to the positive electrode of power supply DC2, and the other end is connected to the positive electrode of diode D1; one end of the coil of relay HS4 is connected to the negative electrode of diode D2, and the other end is connected to the positive electrode of diode D2; between the negative electrode of diode D3 and one end of the coil of relay SS1, the contact of relay HS3 and the contact of relay HS4 are connected in sequence. Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention directly detects the door status through a detection element, solves the problem of authenticity judgment of the door status in the access control system, avoids the misjudgment of the door lock being closed when the lock is open but the door is not pushed open, and provides accurate status information for the Internet of Things access control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a circuit diagram of Example 2.

[0020] Figure 2 This is the circuit schematic diagram of Example 3. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings 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 should fall within the scope of protection of the present application.

[0022] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0023] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0024] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0025] In addition, the terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0026] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] Example 1

[0028] A door state detection circuit of an access control system mainly detects the access control state of two doors being closed together. Therefore, each door has a corresponding detection element, which are detection element H1 and detection element H2. Detection element H1 and detection element H2 are used to send a signal that the door is closed. Detection element H1 and detection element H2 are Hall elements. Hall elements are used to detect the action of pushing the door open.

[0029] The door state detection system includes the detection element H1 and the detection element H2. The door locks are door lock LOCK1 and door lock LOCK2.

[0030] The power supply DC1 is connected to the positive and negative electrodes of the door locks LOCK1 and LOCK2, and the power supply DC is provided with contacts of the relay SS1 on the connection lines with the door locks LOCK1 and LOCK2. It is worth noting that, according to different structures and operations of the locks, the contacts of the relay SS1 are normally open or normally closed according to different needs.

[0031] The power supply DC2 is connected to both ends of the cooling fan to supply power to the cooling fan and help the entire system dissipate heat. Both ends of the power supply DC2 are also connected to both ends of the receiver of the detection element H1 and the receiver of the detection element H2.

[0032] The positive electrode of the power source DC2 is also connected to the negative electrode of the diode D1, one end of the coil of the relay HS1, one end of the contact of the relay HS1, the negative electrode of the diode D2, and one end of the coil of the relay HS2.

[0033] The negative electrode of the power source DC2 is also connected to one end of the contact of the detection element H1, one end of the contact of the relay YS1, one end of the coil of the relay YS1, and one end of the contact of the detection element H2.

[0034] The anode of the diode D1 is connected to the other end of the coil of the relay HS1 and the other end of the contact of the detection element H1. The other end of the contact of the relay HS1 is connected to one end of the contact of the relay HS2. The other end of the contact of the relay HS2 is connected to one end of the coil of the relay XS1 and the other end of the coil of the relay YS1. The other end of the coil of the relay XS1 is connected to the other end of the contact of the relay YS1.

[0035] The anode of the diode D2 is connected to the other end of the coil of the relay HS2 and is also connected to the other end of the contact of the detection element H2.

[0036] The power supply DC3 supplies power to the host M, and the signal receiving end of the host M is connected to the two ends of the contact of the relay XS1. The relay SS1 coil is connected in parallel with the diode D3, and the two common ends between the relay SS1 coil and the diode D3 are respectively connected to one end of the resistor R1 and the collector of the transistor Q1; the emitter of the transistor Q1 is connected to the output end of the host M; one end of the resistor R1 is also connected to the input end of the host M; the other end of the resistor R1 is connected to the base of the transistor Q1.

[0037] The principle of the present invention is as follows: when the owner sends unlocking information to the host by swiping a card, swiping a fingerprint or face recognition at the access control, the host will send an unlocking signal and a surveillance camera start signal. The door leaf lock is opened, the user opens the door, and then closes the door. The host controls the energization of the relay SS1 coil. When the relay coil SS1 is energized, the contact of the relay SS1 is closed, so that the door lock LOCK1 and the door lock LOCK2 are energized and closed. When the door is opened, the receiver of the detection element H1 and the receiver of the detection element H2 respectively detect the movement of the door leaf, and the contact of the detection element H1 and the contact of the detection element H2 are closed. At this time, the relay HS1 coil is energized, and the relay HS2 coil is energized, so that the relay HS1 contact is closed and the relay HS2 contact is closed. Since the relay YS1 contact is a normally closed contact, the relay XS1 (delay relay) coil is energized, the relay XS1 contact is closed, and the host M receives the door to close signal, thereby controlling the surveillance camera to close.

[0038] During this process, the coil of relay YS1 will also be energized. Relay YS1 is a time-delay relay. After 1 second of energization, the normally closed contact of relay YS1 is disconnected. At this time, the coil of relay XS1 is not energized, the contact of relay XS1 is open, and the host M cannot receive the signal. Then the host clears the system to allow the signal detection of the next door opening and closing operation to repeat the process.

[0039] In this process, if any of the main detection element H1 and the detection element H2 does not detect the closing signal, the subsequent relays cannot be energized and work. Therefore, the host M cannot detect the door closed signal and can send an alarm signal to the security personnel.

[0040] In this embodiment, except for the relays emphasized as normally closed contacts, all other relays are normally open contacts.

[0041] It should be emphasized that the control logic of the Hall element H1 and the Hall element H2 itself is that the Hall element outputs a high level in the normal state. The contacts of the Hall element H1 and the Hall element H2 can be understood as follows: when the Hall elements H1 and H2 output a high level, the contacts are closed. When the Hall elements H1 and H2 output a low level, the contacts are disconnected. In the normal state where the door leaf is not pushed, the Hall element continuously outputs a high level. When the door leaf is pushed open, the Hall element outputs a low level. After the door leaf returns to its position, the Hall element outputs a high level. That is, when the door lock is opened and only one door is pushed, such as when only the door where H1 is located is pushed, the Hall element H2 continuously outputs a high level, that is, its contacts are closed.

[0042] Example 2

[0043] The difference between this embodiment and embodiment 1 is that, in order to make this access control detection system also adaptable to the use of a single door leaf, this embodiment adds a cut-off end DCC based on the above embodiment 1, and this cut-off end DCC can be implemented by a switch element.

[0044] Specifically, the cut-off terminal DCC is provided between the other end of the contact of the relay HS1 and the other end of the contact of the relay HS2.

[0045] When there are two doors, the cut-off end is disconnected, and the principle of use is as described in Example 1.

[0046] When there is only one door, the cut-off end is closed. Specifically, for example, when there is only one door, the detection element H2 cannot detect the signal. At this time, the relay HS2 coil is not energized and the relay HS2 contact is not closed. At this time, since the cut-off end DCC is turned on, the other end of the contact of relay HS1 is still connected to one end of the coil of relay XS1.

[0047] Example 3

[0048] The difference between this embodiment and embodiment 1 and embodiment 2 is that the door lock type targeted by embodiment 1 and embodiment 2 is that after pressing the switch to open the door lock, the door must be pushed open, and the door will return to its original position after being pushed open, and then the door will lock itself.

[0049] In this embodiment, the door lock is an existing new type of automatic door lock, that is, after the door lock is opened, even if there is no door pushing action, it will automatically lock again after a certain period of time. Therefore, in this embodiment, a delay relay HYS is added. The two ends of the coil of the delay relay HYS are connected to the positive and negative ends of the power supply DC1, that is, the coil of the delay relay HYS is connected in parallel with the door lock LOCK1 and the door lock LOCK2.

[0050] Furthermore, in this embodiment, the contact of the time delay relay HYS is connected between the contact of the relay HS2 and the coil of the relay XS1. The other end of the contact of the relay HS2 is connected to one end of the contact of the time delay relay HYS. The other end of the contact of the time delay relay HYS is connected to one end of the coil of the relay XS1 and the other end of the coil of the time delay relay YS1. The above-mentioned cut-off terminal DCC is provided between the other end of the contact of the time delay relay HYS and the other end of the contact of the relay HS1.

[0051] It is worth emphasizing that the delay time of the time delay relay HYS can be slightly longer than the automatic closing time of the door lock. The contact of the time delay relay HYS is a normally closed contact, that is, after its coil is energized, the contact is disconnected after a period of delay.

[0052] Furthermore, in this embodiment, a relay HS3 and a relay HS4 are also included. Specifically, one end of the coil of the relay HS3 is connected to the positive electrode of the power supply DC2, and the other end is connected to the positive electrode of the diode D1. One end of the coil of the relay HS4 is connected to the negative electrode of the diode D2, and the other end is connected to the positive electrode of the diode D2.

[0053] A contact of relay HS3 and a contact of relay HS4 are connected in sequence between the cathode of diode D3 and one end of the coil of relay SS1.

[0054] The working principle of this embodiment is as follows: when the owner sends unlocking information to the host by swiping a card, swiping a fingerprint or face recognition at the access control, the host will send an unlocking signal and a surveillance camera start signal. The door leaf lock is opened (if there is a door opening action, execute the process described in Example 1), and no one pushes the door. After a set period of time, the host controls the energization of the relay SS1 coil. When the relay coil SS1 is energized, the contacts of the relay SS1 are closed, so that the door lock LOCK1 and the door lock LOCK2 are energized and closed. At this time, the delay relay HYS coil is energized, that is, after the door lock is self-locked, the contacts of the delay relay HYS are always closed, and the relay YS1 coil and the relay XS1 coil are energized. Since the contacts of the relay YS1 are normally closed contacts, the relay XS1 (delay relay) coil is energized, the relay XS1 contacts are closed, and the host M receives the door to close signal, thereby controlling the surveillance camera to close. After the door lock is closed for a period of time, the contacts of the delay relay HYS are disconnected, the coil of the relay XS1 is not energized, and its contacts are disconnected, so that the circuit is refreshed.

[0055] The function of relay HS3 and relay HS4 is that, if the general residential door or building door is a double door, when the system receives the unlocking command, if only one of the doors can be pushed at the first time, the other door will not be allowed to be powered on and locked, to prevent the owner from being unable to push open the other door when carrying extra-wide items.

[0056] That is, after swiping the card, the door lock is opened, and the person pushes only one door open, that is, the contact of the detection element H1 or the detection element H2 is closed (that is, any door has the action of closing after being pushed open), then according to the control logic of the above Hall element. Then only one of the relay HS3 coil or the relay HS4 coil is continuously energized, and the other is continuously de-energized when the door leaf is not closed back. Then, one of the corresponding relay HS3 contacts or relay HS4 contacts is closed and the other is disconnected. At this time, the coil of relay SS1 is not energized, so that the door locks of the two door leaves cannot be self-locked when the door is not completely closed and returned to the original position.

[0057] It is worth noting that, based on the above structural design, in order to solve the same technical problem, even if some insubstantial changes or modifications are made to the present invention, the essence of the technical solution adopted is still the same as the present invention, so it should also be within the protection scope of the present invention.

Claims

1. The door status detection circuit of the access control system is characterized by: It includes a detection element H, and the detection element H is used to detect the state of the door; The door lock is powered by a power supply, and a contact of a relay SS1 is provided between the door lock and the power supply; the coil of the relay SS1 is connected to the host M, and the host M controls whether the coil of the relay SS1 is energized; The signal receiving end of the host M is also connected to the contact of the relay XS1 to control whether to send a process status signal of the door being opened and then closed to the host M; The contact of the detection element H controls whether the relay HS coil is conducting; the relay HS contact controls whether the relay YS1 coil is conducting; the relay HS2 contact and the relay YS1 contact control whether the relay coil XS1 is conducting; There are two detection elements H, namely detection element H1 and detection element H2, which are used to detect the states of door 1 and door 2 respectively; there are two relays HS, namely relay HS1 and relay HS2; The door locks LOCK1 and LOCK2 on the door 1 and the door 2 are powered by a power supply, and contacts of a relay SS1 are provided between the door locks LOCK1 and LOCK2 and the power supply; The contacts of the detection element H1 and the detection element H2 respectively control whether the relay HS1 coil and the relay HS2 coil are conductive; the relay HS1 contact and the relay HS2 contact control whether the relay YS1 coil is conductive; the relay HS1 contact, the relay HS2 contact and the relay YS1 contact control whether the relay coil XS1 is conductive; The two ends of the power supply are connected to the receiver of the detection element H1 and the two ends of the receiver of the detection element H2; one end of the power supply is also connected to one end of the relay HS1 coil, one end of the relay HS1 contact, and one end of the relay HS2 coil; the other end of the power supply is connected to one end of the detection element H1 contact, one end of the relay YS1 contact, one end of the relay YS1 coil, and one end of the detection element H2 contact; the other end of the relay HS1 coil is connected to the other end of the detection element H1 contact; the other end of the relay HS1 contact is connected to one end of the relay HS2 contact; the other end of the relay HS2 contact is connected to the other end of the relay YS1 coil and one end of the relay XS1 coil; the other end of the relay XS1 coil is connected to the other end of the relay YS1 contact; the other end of the relay HS2 coil is connected to the other end of the detection element H2 contact; The power supply is also connected to both ends of the heat fan; A cut-off terminal is provided between the other end of the contact of relay HS1 and the other end of the contact of relay HS2.

2. The door status detection circuit of the access control system according to claim 1, characterized in that: It also includes a time delay relay HYS, wherein the coil of the time delay relay HYS is connected in parallel with the door lock LOCK1 and the door lock LOCK2; The other end of the contact of relay HS2 is connected to one end of the coil of relay XS1 and the other end of the coil of relay YS1 through the contact of time delay relay HYS, and the contact of time delay relay HYS is a normally closed contact.

3. The door status detection circuit of the access control system according to claim 2, characterized in that: It also includes relay HS3 and relay HS4; one end of the coil of relay HS3 is connected to the positive electrode of power supply DC2, and the other end is connected to the positive electrode of diode D1; one end of the coil of relay HS4 is connected to the negative electrode of diode D2, and the other end is connected to the positive electrode of diode D2; between the negative electrode of diode D3 and one end of the coil of relay SS1, contacts of relay HS3 and contacts of relay HS4 are connected in sequence.

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