Access control electric lock power supply circuit and access control system

Abstract

The application relates to a power supply circuit of an access control electric lock, which comprises: n voltage stabilizing circuits, wherein the n voltage stabilizing circuits are respectively the first to n voltage stabilizing circuits, and the input ends of the voltage stabilizing circuits are respectively used for connecting to alternating current power supply; n-1 isolation circuits, wherein the n-1 isolation circuits are respectively the first to (n-1) isolation circuits, the isolation circuits have a first input end, a second input end and a first output end, the first input ends of the n-1 isolation circuits are respectively connected to the output ends of the voltage stabilizing circuits with the same circuit number; wherein the output end of the first isolation circuit is used for connecting to the access control electric lock, the first output ends of the second to (n-1) isolation circuits are connected to the second input ends of the isolation circuits with the previous circuit number, the second input end of the (n-1) isolation circuit is connected to the output end of the n voltage stabilizing circuit. When the first voltage of the first input end of the isolation circuit is greater than or equal to a first threshold value, the first output end outputs the first voltage, and the second input end and the first output end are disconnected. The power supply circuit of the access control electric lock improves the reliability of the access control system.

Description

Technical Field

[0001] This application relates to the field of access control electric lock technology, and in particular to an access control electric lock power supply circuit and access control system. Background Technology

[0002] Electromagnetic locks are commonly used devices in access control systems. They utilize the principle of electromagnetism. When current passes through a silicon steel sheet, the electromagnetic lock generates a strong attraction force that tightly holds the iron plate, thus achieving the effect of locking the door.

[0003] The power supply to an access control electric lock is crucial for its proper functioning. Access control electric locks typically have a single power source. When this power source fails, or when a circuit connecting the power source and the lock malfunctions, the lock will lose power and become inoperable, unable to perform its access control functions. This is unacceptable for the reliability of the access control system. Summary of the Invention

[0004] Therefore, it is necessary to provide a power supply circuit and access control system for the aforementioned technical problems to improve the reliability of the access control system.

[0005] A power supply circuit for an access control electric lock, the power supply circuit comprising:

[0006] A voltage regulator circuit has n channels, which are the first to nth voltage regulator circuits respectively. The input terminals of the voltage regulator circuits are respectively used to connect to AC power supply.

[0007] An isolation circuit has n-1 channels, which are the 1st to (n-1)th isolation circuits. The isolation circuit has a first input terminal, a second input terminal and a first output terminal. The first input terminals of the n-1 isolation circuits are respectively connected to the output terminals of the voltage regulator circuits with the same channel number.

[0008] Among them, the output terminal of the first isolation circuit is used to connect to the access control electric lock, the first output terminal of the second to (n-1) isolation circuits is connected to the second input terminal of the isolation circuit of the previous number, and the second input terminal of the (n-1)th isolation circuit is connected to the output terminal of the nth voltage regulator circuit.

[0009] When the first voltage at the first input terminal of the isolation circuit is greater than or equal to the first threshold, the first output terminal outputs the first voltage, and the second input terminal and the first output terminal are disconnected. When the first voltage is less than the first threshold, the second input terminal and the first output terminal are connected.

[0010] In one embodiment, the power supply circuit further includes:

[0011] A multi-channel indicator circuit is connected to the output terminal of the voltage regulator circuit, and is used to issue an indicator signal when there is voltage at the output terminal of the voltage regulator circuit.

[0012] In one embodiment, the indicator signal is a first diode and a first resistor, the anode of the first diode is connected to the output terminal of the voltage regulator circuit, and the cathode is grounded through the first resistor. The first diode is a light-emitting diode.

[0013] In one embodiment, the voltage regulator circuit includes a resistor-capacitor circuit, a rectifier bridge, and a first capacitor. The input terminal of the rectifier bridge is connected to an AC power supply through the resistor-capacitor circuit, the positive output terminal is connected to one end of the first capacitor, and the negative output terminal is grounded to the other end of the first capacitor.

[0014] In one embodiment, the voltage regulator circuit further includes a second resistor, a second diode, and a first switching transistor. The control terminal of the first switching transistor is connected to the cathode of the second diode and one end of the second resistor. The first terminal is connected to the positive output terminal of the rectifier bridge and the other end of the second resistor. The second terminal is a DC output terminal. The anode of the second diode is grounded. The second diode is a Zener diode.

[0015] In one embodiment, the RC circuit includes a second capacitor and a third resistor, wherein the third resistor is connected in parallel with the second capacitor.

[0016] In one embodiment, the isolation circuit includes an optocoupler, a fourth resistor, a fifth resistor, a third diode, and a second switch. The anode of the optocoupler is connected to one end of the fourth resistor, the cathode is grounded, the collector is connected to the other end of the fourth resistor and the anode of the third diode, and is the first input terminal. The emitter is connected to one end of the fifth resistor and the control terminal of the second switch. The other end of the fifth resistor is grounded. The first terminal of the second switch is the second input terminal, and the second terminal is connected to the cathode of the third diode, and is the first output terminal.

[0017] In one embodiment, the isolation circuit further includes a third capacitor, one end of which is connected to the control terminal of the second switching transistor, and the other end is grounded.

[0018] An access control system includes the aforementioned access control electric lock power supply circuit.

[0019] The aforementioned access control electric lock power supply circuit and access control system output DC power after the AC power supply is processed by multiple voltage regulator circuits. When the first voltage at the output terminal of the preceding voltage regulator circuit is greater than or equal to a first threshold, the first output terminal of the isolation circuit connected to the output terminal of the preceding voltage regulator circuit outputs a first voltage to power the access control electric lock. The first output terminal is disconnected from the second input terminal to isolate it from the subsequent voltage regulator circuit, maintaining a single voltage regulator circuit power supply. This avoids mutual interference or even damage caused by multiple voltage regulator circuits simultaneously powering the access control electric lock, as well as energy waste. When the first voltage at the output terminal of the preceding voltage regulator circuit is less than the first threshold, the first output terminal and second input terminal of the isolation circuit connected to the output terminal of the preceding voltage regulator circuit are connected to the subsequent voltage regulator circuit, thereby powering the access control electric lock. This access control electric lock power supply circuit has multiple voltage regulator circuits. If the preceding voltage regulator circuit fails or its voltage value is insufficient to meet the power supply requirements, the subsequent voltage regulator circuit replaces the preceding voltage regulator circuit to power the access control electric lock, always maintaining a single voltage regulator circuit power supply, thus improving the reliability of the access control system. Attached Figure Description

[0020] Figure 1 This is a block diagram of the power supply circuit for an access control electric lock according to one embodiment of this application;

[0021] Figure 2 for Figure 1 Circuit diagram of a medium voltage regulator circuit;

[0022] Figure 3 for Figure 1 Circuit diagram of the indicator circuit and isolation circuit. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0026] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0027] Unless otherwise defined, all technical and scientific terms used in this application 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 application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0028] like Figure 1 As shown, in one embodiment, a power supply circuit for an access control electric lock includes a multi-channel voltage regulator circuit 110 and a multi-channel isolation circuit 120.

[0029] The voltage regulator circuit 110 has n channels, which are designated as voltage regulator circuits 1 to n, where n is a natural number. The input terminals of the voltage regulator circuit 110 are used to connect to an AC power supply.

[0030] The AC power supply can be 220V AC mains power, which is converted into DC power, such as the commonly used 12V DC power, after being processed by the voltage regulator circuit 110. In practical applications, to ensure that the access control system can work normally after the mains power grid fails, a 12V DC backup power supply can also be installed, or a DC power supply for fire protection can be connected.

[0031] The isolation circuit 120 has n-1 channels, which are the first to (n-1) channels of the isolation circuit 120. The isolation circuit 120 has a first input terminal X1, a second input terminal X2 and a first output terminal Y1. The first input terminals of the n-1 isolation circuits are respectively connected to the output terminals of the voltage regulator circuits with the same channel number.

[0032] The output of the first isolation circuit is used to connect to the access control lock. The first output of the second to (n-1) isolation circuits is connected to the second input of the isolation circuit of the previous circuit. The second input of the (n-1)th isolation circuit is connected to the output of the nth voltage regulator circuit.

[0033] Specifically, isolation circuit 120 has one less circuit than voltage regulator circuit 110. The first input terminal of isolation circuit 120 is connected to the output terminal of the voltage regulator circuit with the same circuit number. For example, the first input terminal of the first isolation circuit is connected to the output terminal of the first voltage regulator circuit, the first input terminal of the second isolation circuit is connected to the output terminal of the second voltage regulator circuit, the first input terminal of the (n-1)th isolation circuit is connected to the output terminal of the (n-1)th voltage regulator circuit, and the output terminal of the last circuit, i.e., the Nth voltage regulator circuit 110, is connected to the second input terminal of the isolation circuit with the previous circuit number, i.e., the second input terminal of the (n-1)th isolation circuit. The first output terminals of the second to (n-1)th isolation circuits are connected to the second input terminals of the isolation circuits with the previous circuit number. For example, the first output terminal of the second isolation circuit is connected to the second input terminal of the first isolation circuit 120. It should be noted that the access control electric lock power supply circuit has only one voltage output terminal, which is the voltage output terminal connected to the first output terminal of the first isolation circuit after the first voltage regulator circuit is connected to it.

[0034] When the first voltage at the first input terminal of the isolation circuit 120 is greater than or equal to the first threshold, the first output terminal outputs the first voltage, and the second input terminal is disconnected from the first output terminal. When the first voltage is less than the first threshold, the second input terminal is connected to the first output terminal.

[0035] The first voltage is the output voltage of the first output terminal of the isolation circuit 120. During the process of AC power supplying power through multiple voltage regulator circuits 110, the optimal solution is to keep one voltage regulator circuit 110 operating normally and supplying power to the access control lock, while the other voltage regulator circuits are isolated and in standby mode. This ensures the normal operation of the access control system, improves its reliability, and avoids interference and energy waste caused by multiple voltage regulator circuits 110 simultaneously supplying power to the access control lock.

[0036] Specifically, the multi-channel voltage regulator circuit 110 and the isolation circuit 120 cooperate to supply power to the access control lock according to the circuit number sequence of the voltage regulator circuit 110. That is, the preceding voltage regulator circuit 110 is prioritized for power supply, and subsequent voltage regulator circuits are disconnected through an isolation circuit with the same circuit number as the preceding voltage regulator circuit. When the output voltage of the preceding voltage regulator circuit 110 is low, the following voltage regulator circuit 110 is selected to power the access control lock, and the connection between other subsequent voltage regulator circuits and the access control lock is disconnected, ensuring no interference with the preceding voltage regulator circuit. The first threshold is a set value, which needs to be set according to the output voltage value of the voltage regulator circuit under normal operating conditions and the operating voltage range required by the access control lock. For example, if the normal output voltage of the first voltage regulator circuit is 12V, and the operating voltage range required by the access control lock under normal operating conditions is 9-14V, then the first threshold can be set to 9V, and an isolation circuit matching this first threshold needs to be configured. When the first voltage regulator circuit is working normally and the output voltage is greater than or equal to 9V, the first isolation circuit disconnects the second input terminal from the first output terminal to disconnect the second to nth voltage regulator circuits from the access control electric lock.

[0037] The aforementioned access control electric lock power supply circuit outputs DC power after the AC power supply is processed by multiple voltage regulator circuits. When the first voltage at the output terminal of the preceding voltage regulator circuit is greater than or equal to a first threshold, the first output terminal of the isolation circuit connected to the output terminal of the preceding voltage regulator circuit outputs a first voltage to power the access control electric lock. The first output terminal is disconnected from the second input terminal to isolate it from the subsequent voltage regulator circuit, maintaining a single voltage regulator circuit supply and avoiding mutual interference or even damage caused by multiple voltage regulator circuits simultaneously powering the access control electric lock, as well as energy waste. When the first voltage at the output terminal of the preceding voltage regulator circuit is less than the first threshold, the first output terminal and second input terminal of the isolation circuit connected to the output terminal of the preceding voltage regulator circuit are connected to the subsequent voltage regulator circuit, thereby powering the access control electric lock. This access control electric lock power supply circuit has multiple voltage regulator circuits. If the preceding voltage regulator circuit fails or its voltage value is insufficient to meet the power supply requirements, the subsequent voltage regulator circuit replaces the preceding voltage regulator circuit to power the access control electric lock, always maintaining a single voltage regulator circuit supply, thus improving the reliability of the access control system.

[0038] like Figure 2As shown, in one embodiment, the voltage regulator circuit 110 includes an RC circuit, a rectifier bridge B1, and a first capacitor C1. The RC circuit includes a second capacitor C2 and a third resistor R3, with the third resistor R3 connected in parallel with the second capacitor C1. The input terminal of the rectifier bridge B1 is connected to the AC power supply via the RC circuit. The positive output terminal of the rectifier bridge B1 is connected to one end of the first capacitor C1, and the negative output terminal is grounded to the other end of the first capacitor C1. The first capacitor C1 serves as a filter capacitor. The RC circuit steps down the AC power supply before inputting it to the rectifier bridge B1. After rectification, a DC voltage is output and filtered by the first capacitor C1.

[0039] In this embodiment, the voltage regulator circuit 110 further includes a second resistor R2, a second diode D2, and a first switch T1. The control terminal of the first switch T1 is connected to the cathode of the second diode D2 and one end of the second resistor R2. The first end of the first switch T1 is connected to the positive output terminal of the rectifier bridge B1 and the other end of the second resistor R2. The second end is the DC output terminal. The anode of the second diode D2 is grounded. The second diode D2 is a Zener diode.

[0040] Specifically, the first switching transistor T1 is an NPN transistor, with its base connected to the cathode of the second diode D2, its collector connected to the positive output terminal of the rectifier bridge B1, and its emitter being the DC output terminal. When the voltage output of the rectifier bridge B1 is less than the regulated voltage of the second diode D2, the first switching transistor T1 conducts and outputs the rectifier bridge's output voltage. When the voltage output of the rectifier bridge fluctuates and exceeds the regulated voltage of the second diode, the second diode breaks down in reverse, and the excess current flows through the second diode, bringing it into a regulated state.

[0041] like Figure 3 As shown, in one embodiment, the isolation circuit 120 includes an optocoupler IC1, a fourth resistor R4, a fifth resistor R5, a third diode D3, and a second switch T2. The anode of the optocoupler IC1 is connected to one end of the fourth resistor R4, the cathode is grounded, the collector is connected to the other end of the fourth resistor R4 and the anode of the third diode D3, and is the first input terminal X1. The emitter is connected to one end of the fifth resistor R5 and the control terminal of the second switch T2. The other end of the fifth resistor R5 is grounded. The first terminal of the second switch T2 is the second input terminal, the second terminal is connected to the cathode of the third diode D3, and is the first output terminal Y1.

[0042] Specifically, the second switch T2 is a PNP transistor. When the input voltage at the first input terminal X1 is greater than or equal to the first threshold, the optocoupler IC1 is turned on, the base of the second switch T2 is at a high level and is in the off state, thus cutting off the subsequent voltage regulator circuit 110. Conversely, when the input voltage at the first input terminal is less than the first threshold, it is difficult to meet the power supply requirements of the access control lock. At this time, the second switch T2 is turned on, and one of the subsequent voltage regulator circuits 110 supplies power to the access control lock. Furthermore, the third diode D3 can effectively prevent current reverse flow. The isolation circuit 120 also includes a third capacitor C3, one end of which is connected to the control terminal of the second switch T2, and the other end is grounded.

[0043] In this embodiment, the power supply circuit further includes a multiplexer circuit 130, which is connected to the output terminal of the voltage regulator circuit and is used to issue an indication signal when there is voltage at the output terminal of the voltage regulator circuit. The indication circuit 130 includes a first diode D1 and a first resistor R1. The anode of the first diode D1 is connected to the output terminal of the voltage regulator circuit 110, and the cathode is grounded through the first resistor R1. The first diode D1 is a light-emitting diode.

[0044] In addition, this application also provides an access control system, which includes the access control electric lock power supply circuit described above.

[0045] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A power supply circuit for an access control electric lock, characterized in that, The power supply circuit includes: A voltage regulator circuit has n channels, which are the first to nth voltage regulator circuits respectively. The input terminals of the voltage regulator circuits are respectively used to connect to AC power supply. An isolation circuit has n-1 channels, which are the first to (n-1)th isolation circuits. The isolation circuit has a first input terminal, a second input terminal and a first output terminal. The first input terminals of the first to (n-1)th isolation circuits are respectively connected to the output terminals of voltage regulator circuits with the same channel number. Among them, the output terminal of the first isolation circuit is used to connect to the access control electric lock, the first output terminal of the second to (n-1) isolation circuits is connected to the second input terminal of the isolation circuit of the previous number, and the second input terminal of the (n-1)th isolation circuit is connected to the output terminal of the nth voltage regulator circuit. When the first voltage at the first input terminal of the isolation circuit is greater than or equal to the first threshold, the first output terminal outputs the first voltage, and the second input terminal and the first output terminal are disconnected; when the first voltage is less than the first threshold, the second input terminal and the first output terminal are connected. The isolation circuit includes an optocoupler, a fourth resistor, a fifth resistor, a third diode, and a second switching transistor. The anode of the optocoupler is connected to one end of the fourth resistor, the cathode is grounded, the collector is connected to the other end of the fourth resistor and the anode of the third diode, and is the first input terminal. The emitter is connected to one end of the fifth resistor and the control terminal of the second switching transistor, the other end of the fifth resistor is grounded, the first terminal of the second switching transistor is the second input terminal, and the second terminal is connected to the cathode of the third diode, and is the first output terminal.

2. The access control electric lock power supply circuit according to claim 1, characterized in that, The power supply circuit also includes: A multi-channel indicator circuit is connected to the output terminal of the voltage regulator circuit, and is used to issue an indicator signal when there is voltage at the output terminal of the voltage regulator circuit.

3. The access control electric lock power supply circuit according to claim 2, characterized in that, The indicator circuit includes a first diode and a first resistor. The anode of the first diode is connected to the output terminal of the voltage regulator circuit, and the cathode is grounded through the first resistor. The first diode is a light-emitting diode.

4. The access control electric lock power supply circuit according to claim 1, characterized in that, The voltage regulator circuit includes an RC circuit, a rectifier bridge, and a first capacitor. The input terminal of the rectifier bridge is connected to an AC power supply through the RC circuit, the positive output terminal is connected to one end of the first capacitor, and the negative output terminal is grounded to the other end of the first capacitor.

5. The access control electric lock power supply circuit according to claim 4, characterized in that, The voltage regulator circuit further includes a second resistor, a second diode, and a first switching transistor. The control terminal of the first switching transistor is connected to the cathode of the second diode and one end of the second resistor. The first terminal is connected to the positive output terminal of the rectifier bridge and the other end of the second resistor. The second terminal is the DC output terminal. The anode of the second diode is grounded. The second diode is a Zener diode.

6. The access control electric lock power supply circuit according to claim 5, characterized in that, The RC circuit includes a second capacitor and a third resistor, with the third resistor connected in parallel with the second capacitor.

7. The access control electric lock power supply circuit according to claim 1, characterized in that, The isolation circuit also includes a third capacitor, one end of which is connected to the control terminal of the second switching transistor, and the other end is grounded.

8. An access control system, characterized in that, Includes the access control electric lock power supply circuit as described in any one of claims 1 to 7.

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