A power-down automatic door opening circuit for a gate machine

Abstract

This application discloses an automatic door opening circuit for a power-off door station, including a door station control circuit. This circuit includes a first relay and a second relay. The first relay includes a first control terminal and a second control terminal, which are electrically connected to a controlled circuit. The controlled circuit includes a command control terminal for receiving an external command enable signal. The second relay includes a third control terminal and a fourth control terminal. The third control terminal is connected to a power supply, and the fourth control terminal is grounded. The first common terminal of the first relay is electrically connected to the second common terminal of the second relay, serving as the first output terminal of the door station control circuit. The first normally open terminal of the first relay is electrically connected to the second normally closed terminal of the second relay, serving as the second output terminal of the door station control circuit. The first normally closed terminal of the first relay is also electrically connected to the second normally open terminal of the second relay. This technical solution enables the automatic opening of the electric door in the event of a power supply failure.

Description

Technical Field

[0001] This application relates to the field of control circuit technology, and particularly to a door station automatic door opening circuit when power is off. Background Technology

[0002] Access control systems are widely used in residential communities, commercial office buildings, apartments, hospitals, stadiums and other scenarios. As an important part of the modern service industry, access control systems play a vital role in ensuring the safety of businesses and residents.

[0003] Access control systems typically consist of a door station, a power supply for the door station, a door lock controller, an electric lock, and the door. The door station, as the human-machine interface, usually allows users to send opening commands via password, card swipe, facial recognition, or fingerprint. The door lock controller then activates the electric lock to open the door. Alternatively, users can remotely send opening commands to the door station via a mobile app, mini-program, or official account. If no opening command is received, or if the door opens after a delay following a command being issued, the door will automatically close.

[0004] Therefore, doors in access control systems are usually closed by default. However, if a power outage occurs due to an accident or disaster, and the door remains closed, it can easily create significant safety hazards. This is a technical issue that needs to be addressed and resolved. Utility Model Content

[0005] The main technical problem addressed by this application is to provide a circuit for automatically opening the door when the door station loses power, thereby resolving the safety hazard caused by the door station defaulting to a closed state after power failure in the prior art.

[0006] To solve the above-mentioned technical problems, one technical solution adopted in this application is to provide an automatic door opening circuit for a door station when power is lost, including a door station control circuit. The door station control circuit includes a first relay and a second relay. The first relay includes a first control terminal and a second control terminal, which are electrically connected to a controlled circuit. The controlled circuit includes a command control terminal for receiving an external command enable signal. The second relay includes a third control terminal and a fourth control terminal. The third control terminal is connected to a power supply, and the fourth control terminal is grounded. The first common terminal of the first relay is electrically connected to the second common terminal of the second relay and serves as the first output terminal of the door station control circuit. The first normally open terminal of the first relay is electrically connected to the second normally closed terminal of the second relay and serves as the second output terminal of the door station control circuit. The first normally closed terminal of the first relay is electrically connected to the second normally open terminal of the second relay.

[0007] In some embodiments, a door lock controller is also included, wherein the first output terminal and the second output terminal of the door station control circuit are electrically connected to the control terminal and the ground terminal of the door lock controller, respectively, and the output terminal of the door lock controller is used to connect to the electric door.

[0008] In some embodiments, if a pressure difference greater than or equal to a threshold value is generated between the first control terminal and the second control terminal, then the first common terminal is electrically connected to the first normally open terminal; otherwise, if there is no pressure difference or the pressure difference is less than the threshold value between the first control terminal and the second control terminal, then the first common terminal is electrically connected to the first normally closed terminal.

[0009] In some embodiments, when the power supply connected to the third control terminal is de-energized, the second common terminal is electrically connected to the second normally closed terminal.

[0010] In some embodiments, the controlled circuit includes a transistor, a first resistor, and a second resistor. The first end of the first resistor and the first end of the second resistor are electrically connected, and the electrical connection serves as the command control terminal. The second end of the first resistor is electrically connected to the emitter of the transistor, and the second end of the second resistor is electrically connected to the base of the transistor.

[0011] In some embodiments, the emitter of the transistor is grounded, the collector of the transistor is electrically connected to the second control terminal of the first relay, and the first control terminal of the first relay is connected to a power supply.

[0012] In some embodiments, the emitter of the transistor is electrically connected to the first control terminal of the first relay, the collector of the transistor is connected to a power supply, and the second control terminal of the first relay is grounded.

[0013] In some embodiments, the second relay and the first relay are integrated; or, the second relay and the first relay are separate components.

[0014] In some embodiments, a diode is disposed between the first control terminal and the second control terminal, wherein the positive terminal of the diode is electrically connected to the second control terminal and the negative terminal of the diode is electrically connected to the first control terminal.

[0015] The beneficial effects of this application are as follows: This application discloses an automatic door opening circuit for a door station in the event of a power failure, including a door station control circuit, which includes a first relay and a second relay. The first relay includes a first control terminal and a second control terminal, which are electrically connected to a controlled circuit. The controlled circuit includes a command control terminal for receiving an external command enable signal. The second relay includes a third control terminal and a fourth control terminal, with the third control terminal connected to a power supply and the fourth control terminal grounded. The first common terminal of the first relay is electrically connected to the second common terminal of the second relay and serves as the first output terminal of the door station control circuit. The first normally open terminal of the first relay is electrically connected to the second normally closed terminal of the second relay and serves as the second output terminal of the door station control circuit. The first normally closed terminal of the first relay is also electrically connected to the second normally open terminal of the second relay. Through the technical solution of this application, the electric door can be automatically opened when the power supply fails. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the circuit composition in one embodiment of this application;

[0017] Figure 2 This is a schematic diagram of another circuit configuration in one embodiment of this application;

[0018] Figure 3 yes Figure 2 Schematic diagram of the circuit for controlling door opening in the embodiment;

[0019] Figure 4 yes Figure 2 The circuit diagram illustrating the working principle of opening the door after a power outage in the embodiment. Detailed Implementation

[0020] To facilitate understanding of this application, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this application.

[0021] It should be noted that, unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0022] The embodiments will now be described in detail with reference to the accompanying drawings.

[0023] For ease of explanation, Figure 1The first embodiment is shown, which includes a door station control circuit 1, a door lock controller 2, and an electric door 3. The door station control circuit 1 includes a first relay RL1, a transistor Q1, a diode D1, a first resistor R1, and a second resistor R2. The normally open terminal NO (second output terminal) and the common terminal COM (first output terminal) of the door station control circuit 1 are connected via cables to the control terminal 21 and the ground terminal 22 of the door lock controller 2, respectively. The output terminal 23 of the door lock relay 2 is connected via a cable to the electric lock terminal 31 of the electric door 3, and the electric lock terminal 31 receives control signals to control the opening and closing of the electric door 3.

[0024] In this circuit, transistor Q1, first resistor R1, and second resistor R2 form a controlled circuit. Figure 1 The controlled circuit is located between the second control terminal 115 of the first relay RL1 and the ground terminal, and is used to control the connection or disconnection of the second control terminal 115 and the ground terminal. The controlled circuit can also be located between the power supply VCC and the first control terminal 111, and is used to control the connection or disconnection of the power supply VCC and the first control terminal 111. Specifically, the first end of the first resistor R1 and the first end of the second resistor R2 are electrically connected, and this connection serves as the command control terminal to receive the door enable signal Door_Open. The second end of the first resistor R1 is electrically connected to the emitter of transistor Q1, and the second end of the second resistor R2 is electrically connected to the base of transistor Q1. When the controlled circuit is located between the second control terminal 115 and the ground terminal, the emitter of transistor Q1 is grounded, the collector of transistor Q1 is electrically connected to the second control terminal 115 of the first relay, and the first control terminal of the first relay is connected to the power supply. When the controlled circuit is set between the power supply VCC and the first control terminal 111, the emitter of transistor Q1 is electrically connected to the first control terminal 111 of the first relay, the collector of transistor Q1 is connected to the power supply VCC, and the second control terminal 115 of the first relay is grounded.

[0025] In addition, diode D1 is positioned between the first control terminal 111 and the second control terminal 115. The positive terminal of diode D1 is electrically connected to the second control terminal 115, and the negative terminal of diode D1 is electrically connected to the first control terminal 111.

[0026] The door opening process is as follows: When the door station control circuit 1 receives an opening command (such as facial recognition verification, fingerprint recognition verification, card swipe verification, etc.), the first common terminal 114 of its internal first relay RL1 switches from being connected to the first normally closed terminal 112 to being connected to the first normally open terminal 113. This connects the first normally open terminal 113 and the first common terminal 114 of the door station control circuit 1, thereby connecting the control terminal 21 and the ground terminal 22 of the door lock controller 2. The output terminal 23 of the door lock relay 2 generates an opening signal to the electric door 3, causing the door to open. After the door station control circuit 1 completes the opening command, the first common terminal 114 of its internal first relay RL1 switches from being connected to the first normally open terminal 113 to being connected to the first normally closed terminal 112. This disconnects the control terminal 21 and the ground terminal 22 of the door lock controller 2, canceling the opening signal and causing the electric door 3 to close.

[0027] Specifically, in Figure 1 In the door station control circuit 1, a power supply VCC is included. The door opening enable signal Door_Open comes from a sensor, such as a password input, card swipe, facial recognition, or fingerprint sensor. In the initialization and normal states, the first common terminal 114 of the first relay RL1 is connected to the first normally closed terminal 112, and disconnected from the first normally open terminal 113. Therefore, the first relay RL1 is normally closed by default.

[0028] When the door operator control circuit 1 receives an open command, the door open enable signal Door_Open is high, causing transistor Q1 to conduct. The second control terminal 115 of the first relay RL1 is grounded, creating a voltage difference between the first control terminal 111 and the second control terminal 115. This voltage difference is greater than or equal to a threshold value. If the minimum voltage required for the internal armature of the relay to operate is this threshold value, the internal armature of the first relay RL1 will engage, and the first common terminal 114 of the first relay RL1, which was previously connected to the first normally closed terminal 112, will switch to being connected to the first normally open terminal 113. Otherwise, if there is no voltage difference or the voltage difference is less than the threshold value between the first control terminal 111 and the second control terminal 115, the internal armature of the first relay RL1 will not engage. Since the first common terminal 114 is connected to the first normally open terminal 113, the control terminal 21 and the ground terminal 22 of the door lock controller 2, which are respectively connected to these terminals, are connected. The output terminal 23 of the door lock controller 2 generates an open signal and sends it to the electric door 3, thus opening the electric door 3.

[0029] After the door operator executes the received door opening command, the door opening enable signal Door_Open is low. At this time, transistor Q1 is cut off, and the second control terminal 115 of the first relay RL1 is disconnected from ground. There is no voltage difference between the first control terminal 111 and the second control terminal 115. The armature inside the first relay RL1 is released, and the first common terminal 114 of the first relay RL1, which was previously connected to the first normally open terminal 113, is switched to being connected to the first normally closed terminal 112. After the first common terminal 114 is disconnected from the first normally open terminal 113, the control terminal 21 and the ground terminal 22 of the door lock controller 2, which were respectively connected to them, are disconnected. The door opening signal generated by the output terminal 23 of the door lock controller 2 is canceled, and the electric door 3 is therefore closed.

[0030] When the power supply VCC is normal, the above-mentioned door station control circuit 1 works normally. However, when the power supply fails due to other accidents, the circuit cannot work because the power supply VCC is 0V. The transistor Q1 and the first relay RL1 cannot work. Therefore, the first common terminal 114 of the first relay RL1 cannot be connected to the first normally open terminal 113. Consequently, the control terminal 21 and the ground terminal 22 of the door lock controller 2 cannot be connected, and the door opening signal cannot be output to the electric door, causing the electric door to be unable to open. If there is no other backup door opening method, there will be a significant safety hazard.

[0031] exist Figure 1 Based on the illustrated embodiments, as Figure 2 As shown, the internal circuitry of the door station control circuit 1 is further improved by adding a second relay RL2. This second relay RL2 is a normally closed relay; that is, in the default state, when the two control terminals of the second relay are not energized and there is no voltage difference, the second common terminal 124 of the second relay RL2 is electrically connected to the second normally closed terminal 122. Specifically, the second normally closed terminal 122 of the second relay RL2 is electrically connected to the first normally open terminal 113 of the first relay RL1, serving as the second output terminal of the door station control circuit 1, and is also electrically connected to the control terminal 21 of the door lock controller 2; the second common terminal 124 of the second relay RL2 is electrically connected to the first common terminal 114 of the first relay RL1, serving as the first output terminal of the door station control circuit 1, and is also electrically connected to the ground terminal 22 of the door lock controller 2; the second normally open terminal 123 of the second relay RL2 is electrically connected to the first normally closed terminal 112 of the first relay RL1; the third control terminal 121 of the second relay RL2 is connected to the power supply VCC, and the fourth control terminal 125 is grounded. During normal operation, as... Figure 2As shown, the door opening enable signal Door_Open is at a low voltage. There is no voltage difference between the first control terminal 111 and the second control terminal 115 of the first relay RL1, and the internal armature does not operate. The first common terminal 114 of the first relay RL1 is connected to the first normally closed terminal 112 and disconnected from the first normally open terminal 113. The second relay RL2 is powered by VCC. After power-on, a voltage difference is generated between the third control terminal 121 and the fourth control terminal 125 of the second relay RL2, causing its armature to engage. The second common terminal 124 of the second relay RL2 disconnects from the second normally closed terminal 122 and switches to connect to the second normally open terminal 123. Correspondingly, the control terminal 21 and the ground terminal 22 of the door lock controller 2 are in an open state, no door opening signal is generated, and the electric door remains closed.

[0032] Furthermore, such as Figure 3 As shown, when the Door_Open enable signal is active and high voltage is applied, the armature inside the first relay RL1 is activated, and the first common terminal 114 of the first relay RL1, which was previously connected to the first normally closed terminal 112, is switched to be connected to the first normally open terminal 113. Because the first common terminal 114 is connected to the first normally open terminal 113, the control terminal 21 and the ground terminal 22 of the door lock controller 2, which are respectively connected to each other, are connected. The output terminal 23 of the door lock controller 2 generates an opening signal for the electric door 3, thus opening the electric door 3.

[0033] Furthermore, such as Figure 4 As shown, if the power supply fails, VCC will be 0. The first relay RL1 will not work, and the armature inside the first relay RL1 will not operate. The first common terminal 114 of the first relay RL1 will remain connected to the first normally closed terminal 112 and will not switch to the first normally open terminal 113. However, when VCC is 0, there is no voltage difference between the third control terminal 121 and the fourth control terminal 125 of the second relay RL2. The internal armature will be released, and the second normally open terminal 123 will switch to the second normally closed terminal 122. At this time, the second normally closed terminal 122 of the second relay RL2 will be connected to the second common terminal 124. This is equivalent to the door station control circuit 1 closing its two external output terminals NO and COM. The door lock controller 2 will generate an opening signal, and the electric door 3 will open automatically.

[0034] for Figures 2 to 4 In the door station control circuit 1, the second relay RL2 and the first relay RL2 are integrated. This method is suitable for products that are manufactured directly. Alternatively, the second relay RL2 and the first relay RL1 are set separately. This method is suitable for adding the second relay RL2 later. For example, the second relay RL2 is set outside the door, while the first relay RL1 is set inside the door, which is beneficial for controlling the two relays separately.

[0035] Therefore, this application discloses an automatic door opening circuit for a power-off door station, including a door station control circuit, which includes a first relay and a second relay. The first relay includes a first control terminal and a second control terminal, which are electrically connected to a controlled circuit. The controlled circuit includes a command control terminal for receiving an external command enable signal. The second relay includes a third control terminal and a fourth control terminal, with the third control terminal connected to a power supply and the fourth control terminal grounded. The first common terminal of the first relay is electrically connected to the second common terminal of the second relay and serves as the first output terminal of the door station control circuit. The first normally open terminal of the first relay is electrically connected to the second normally closed terminal of the second relay and serves as the second output terminal of the door station control circuit. The first normally closed terminal of the first relay is also electrically connected to the second normally open terminal of the second relay. Through the technical solution of this application, the electric door can be automatically opened when the power supply fails.

[0036] The above are merely embodiments of this application and do not limit the scope of this patent application. Any equivalent structural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of this application.

Claims

1. A power-off automatic door opening circuit for a door station, characterized in that, The system includes a door station control circuit, which includes a first relay and a second relay. The first relay includes a first control terminal and a second control terminal, which are electrically connected to a controlled circuit. The controlled circuit includes a command control terminal for receiving an external command enable signal. The second relay includes a third control terminal and a fourth control terminal, with the third control terminal connected to a power supply and the fourth control terminal grounded. The first common terminal of the first relay is electrically connected to the second common terminal of the second relay and serves as the first output terminal of the door station control circuit; the first normally open terminal of the first relay is electrically connected to the second normally closed terminal of the second relay and serves as the second output terminal of the door station control circuit; the first normally closed terminal of the first relay is electrically connected to the second normally open terminal of the second relay.

2. The automatic door opening circuit for a door station in case of power failure as described in claim 1, characterized in that, It also includes a door lock controller, wherein the first and second output terminals of the door station control circuit are electrically connected to the control terminal and ground terminal of the door lock controller, respectively, and the output terminal of the door lock controller is used to connect to the electric door.

3. The automatic door opening circuit for a door station in case of power failure as described in claim 1, characterized in that, If a pressure difference greater than or equal to a threshold value is generated between the first control terminal and the second control terminal, then the first common terminal is electrically connected to the first normally open terminal; otherwise, if there is no pressure difference or the pressure difference is less than the threshold value between the first control terminal and the second control terminal, then the first common terminal is electrically connected to the first normally closed terminal.

4. The automatic door opening circuit for a door station in case of power failure as described in claim 1, characterized in that, When the power supply connected to the third control terminal is de-energized, the second common terminal is electrically connected to the second normally closed terminal.

5. The automatic door opening circuit for a door station in case of power failure as described in claim 1, characterized in that, The controlled circuit includes a transistor, a first resistor, and a second resistor. The first end of the first resistor and the first end of the second resistor are electrically connected, and the electrical connection serves as the command control terminal. The second end of the first resistor is electrically connected to the emitter of the transistor, and the second end of the second resistor is electrically connected to the base of the transistor.

6. The automatic door opening circuit for a door station in case of power failure as described in claim 5, characterized in that, The emitter of the transistor is grounded, and the collector of the transistor is electrically connected to the second control terminal of the first relay. The first control terminal of the first relay is connected to a power supply.

7. The automatic door opening circuit for a door station in case of power failure as described in claim 5, characterized in that, The emitter of the transistor is electrically connected to the first control terminal of the first relay, the collector of the transistor is connected to the power supply, and the second control terminal of the first relay is grounded.

8. The automatic door opening circuit for a door station in case of power failure as described in claim 1, characterized in that, The second relay is integrated with the first relay; or the second relay and the first relay are separate components.

9. The automatic door opening circuit for a door station in case of power failure as described in claim 1, characterized in that, A diode is disposed between the first control terminal and the second control terminal, with the positive terminal of the diode electrically connected to the second control terminal and the negative terminal of the diode electrically connected to the first control terminal.

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