Access control power supply method and system

Abstract

The present invention discloses a method for supplying a power supply for access control, which is applied to a power supply system for access control, wherein the power supply system for access control includes at least a power supply for access control and an emergency power supply, and the method includes: monitoring feedback information of an AC voltage supply circuit of the access control power supply; generating a first control signal / a second control signal based on the feedback information; if the AC power input from the access control power supply exceeds a preset first voltage stability threshold within a preset time, executing the first control signal to switch the power supply of the access control power supply from the access control power supply to the emergency power supply; if the AC power input from the emergency power supply exceeds a preset second voltage stability threshold within a preset time, executing the second control signal to switch the power supply of the access control power supply from the emergency power supply to the access control power supply. Thus, the method and system provided by the present invention can cope with access control power failures in an emergency state, and improve the safety and stability of access control use.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply, and in particular to a door access control power supply method and system. Background Art

[0002] At present, access control plays an extremely important role in many intelligent building fields. It integrates microcomputer automatic identification technology and modern security management measures, involving many new technologies such as electronics, machinery, optics, computer technology, communication technology and biotechnology. It is an effective measure to solve the security management of the entrances and exits of important departments. It is suitable for various confidential departments, especially in areas such as banks, hotels, parking lot management, computer rooms, armories, confidential rooms, offices, intelligent communities and factories that need to pay attention to security control. Access control has surpassed simple doorway and key management. It has gradually developed into a complete set of security control systems to protect the use field.

[0003] However, with the technical iteration and update of access control, access control has changed from a simple battery-based power supply to a network-controlled power supply, so that the power supply of access control can be controlled intelligently through the network. However, there may be dangerous situations due to network failure, for example, network failure during emergency use of a certain access control scene, power failure due to power outage at the site, resulting in the inability to unlock, thus endangering personal safety or property safety. Therefore, how to safely and stably supply power to the access control power supply in the event of power network failure has become an urgent problem to be solved. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a door access control power supply method and system, which can prevent in advance the failure of door access control in an emergency state caused by poor network power supply, power outage, overload, etc.

[0005] A first aspect of the present invention discloses a method for supplying a access control power supply, which is applied to a access control power supply system, wherein the access control power supply system includes at least an access control power supply and an emergency power supply, and the method includes: monitoring feedback information of an AC voltage supply circuit of the access control power supply; generating a first control signal / a second control signal based on the feedback information; if the AC power input from the access control power supply exceeds a preset first voltage stability threshold within a preset time, executing the first control signal to switch the power supply of the access control power supply from the access control power supply to the emergency power supply; if the AC power input from the emergency power supply exceeds a preset second voltage stability threshold within a preset time, executing the second control signal to switch the power supply of the access control power supply from the emergency power supply to the access control power supply.

[0006] In some embodiments, the monitoring of feedback information of the AC voltage supply circuit of the access control power supply further includes: generating a third control signal based on the feedback information; if the AC power input from the access control power supply exceeds a preset voltage safety threshold, executing the third control signal to connect the charging thread of the access control power supply.

[0007] In some embodiments, the method further includes: when executing the first control signal, the second control signal, and the third control signal, supplying the access control power supply with an instantaneous AC power supply for suppressing voltage drops, which is generated by an AC voltage supply circuit of the access control power supply isolated by a diode.

[0008] In some embodiments, the method further includes: connecting an AC voltage supply circuit of the access control power supply to the emergency power supply via an additional TVS diode.

[0009] In some implementations, the method further includes: when executing the first control signal, the second control signal, and the third control signal, generating current power state information and saving it to a power control database.

[0010] The second aspect of the present invention discloses a door access control power supply system, the system comprising: a door access control power supply; an emergency power supply; a monitoring module for monitoring feedback information of an AC voltage supply circuit of the door access control power supply;

[0011] A control module is used to generate a first control signal / a second control signal based on the feedback information; a judgment module is used to execute the first control signal to switch the power supply of the access control power supply from the access control power supply to the emergency power supply when the AC power input of the access control power supply exceeds a preset first voltage stability threshold within a preset time; and execute the second control signal to switch the power supply of the access control power supply from the emergency power supply to the access control power supply when the AC power input of the emergency power supply exceeds a preset second voltage stability threshold within a preset time.

[0012] In some embodiments, the control module is further used to generate a third control signal based on the feedback information; the judgment module is further used to execute the third control signal to connect the charging thread of the access control power supply when the AC power input of the access control power supply exceeds a preset voltage safety threshold.

[0013] In some embodiments, the system further includes: a transient control module for supplying a transient AC power supply for suppressing voltage drops to the access control power supply when executing the first control signal, the second control signal, and the third control signal. The AC power supply circuit of the access control power supply is isolated by a diode.

[0014] In some implementations, the AC voltage supply circuit of the access control power supply is connected to the emergency power supply via an additional TVS diode.

[0015] In some implementations, the system further includes: a power control database, configured to obtain and store current power state information when executing the first control signal, the second control signal, and the third control signal.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The implementation of the present invention can monitor the AC voltage supply circuit of the access control power supply, accurately locate the voltage stability of the access control power supply, and then judge and switch to the corresponding power connection based on the provided emergency power supply and the set voltage stability threshold, so that the access control power supply can be connected to the safety power supply in time without being affected by the external network, power outage, etc., and can also be switched back to the access control power supply from the emergency power supply in time when the power supply is restored, thereby improving the voltage stability of the access control power supply. In addition, by monitoring the AC voltage supply circuit of the access control power supply, it is determined whether it exceeds the set voltage safety threshold, thereby preventing the access control voltage from being too high or too low, resulting in damage to the circuit board or other electronic components of the access control device, causing the entire access control to fail to work properly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic flow chart of a method for supplying access control power disclosed in an embodiment of the present invention;

[0019] Figure 2 A schematic diagram of a access control power supply circuit disclosed in an embodiment of the present invention;

[0020] Figure 3 A schematic flow chart of another access control power supply method disclosed in an embodiment of the present invention;

[0021] Figure 4 A schematic diagram of a door access control power supply system framework disclosed in an embodiment of the present invention;

[0022] Figure 5 The present invention is a schematic diagram of the structure of a door access control power supply device disclosed in an embodiment of the present invention. DETAILED DESCRIPTION

[0023] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] The terms "including" and "having" and any variations thereof in the embodiments of the present invention are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or modules is not necessarily limited to those steps or modules explicitly listed, but may include other steps or modules not explicitly listed or inherent to these processes, methods, products or apparatus.

[0025] The embodiment of the present invention discloses a method and system for supplying access control power, which can accurately locate the voltage stability of the access control power by monitoring the AC voltage supply circuit of the access control power, and then judge and switch to the corresponding power connection according to the provided emergency power and the set voltage stability threshold, so that the access control power can be connected to the safety power in time without being affected by the external network, power failure, etc., and can also be switched back to the access control power from the emergency power in time when the power is restored, thereby improving the voltage stability of the access control power. In addition, by monitoring the AC voltage supply circuit of the access control power, it is judged whether it exceeds the set voltage safety threshold, so as to prevent the access control voltage from being too high or too low, resulting in damage to the circuit board or other electronic components of the access control device, causing the entire access control to fail to work normally.

[0026] Embodiment 1

[0027] See also Figure 1 , Figure 1 The present invention discloses a method for supplying power to a door access control system. The present invention discloses a method for supplying power to a door access control system. The present invention discloses a method for supplying power to a door access control system. The present invention discloses a method for supplying power to a door access control system. The present invention discloses a method for supplying power to a door access control system. The present invention discloses a method for supplying power to a door access control system. Figure 1 As shown, the access control power supply method may include the following operations:

[0028] Step 101: monitoring feedback information of an AC voltage supply circuit of a door access power supply.

[0029] This embodiment is mainly aimed at the access control power supply method with an additional emergency power supply in the case of network power failure, that is, the entire access control power supply system includes an access control power supply and an emergency power supply. The supply of the access control power supply is mainly obtained based on the AC voltage supply circuit connected to the external power supply, which can use the relay to turn on / off the AC circuit input by the external source. When using the external network control, it is mainly to control the on / off state of its relay. In order to obtain the implementation voltage state information of the access control power supply, it can be realized as detecting and monitoring the voltage between the AC voltage supply circuit and the relay. The DC voltage supply circuit is not monitored because, in the access control power supply, the 220V AC power supply supplied to the access control power supply needs to be converted into a 12V / 100A DC power supply. In this conversion process, it is easy to cause mismonitoring and cause the actual state to be inconsistent, and it has a delay. The feedback information of monitoring the AC voltage supply circuit can specifically include the voltage value and current value of the access control power supply.

[0030] Step 102: Generate a first control signal / a second control signal based on feedback information.

[0031] Two control signals are generated by the feedback information obtained. The generated rules can be set according to step 103. The two signals can control the different power supply switching objects of the access control power supply to timely avoid the access control out of control phenomenon in the case of network disconnection.

[0032] Step 103: If the AC power input from the access control power supply exceeds a preset first voltage stability threshold within a preset time, execute a first control signal to switch the power supply of the access control power supply from the access control power supply to the emergency power supply.

[0033] Among them, the preset voltage stability threshold is set according to the access control working scenario. For example, in scenarios such as banks and government agencies with high security requirements, the voltage stability threshold is set between 12v and 16v. For scenarios such as schools and communities where the security requirements are not too high, the voltage stability threshold is set between 14v and 18v.

[0034] When it is detected that the voltage of the AC power input of the access control power supply exceeds the voltage stability threshold within a preset time, such as within 20ms, it is determined that the line controlled by its external network power supply has a tendency to disconnect, that is, it is an unstable AC power supply. At this time, the power supply of the access control power supply is switched from the access control power supply to the emergency power supply according to the first control signal, and the source of the AC voltage supply circuit of the access control power supply is further controlled to be connected to the emergency power supply according to the first control signal.

[0035] In a preferred embodiment, the emergency power supply can be set to one or more. When connecting to the emergency power supply, the proximal emergency power supply can be preferentially selected, or one of the multiple emergency power supplies can be switched arbitrarily.

[0036] Step 104: If the AC power input from the emergency power supply exceeds a preset second voltage stability threshold within a preset time, execute a second control signal to switch the power supply of the access control power supply from the emergency power supply to the access control power supply.

[0037] Since the configuration of emergency power supplies is generally high voltage and high power, if a power supply with low voltage requirements such as the access control power supply is connected to the emergency power supply for a long time, it is easy to cause power overload and burn out of components. Therefore, it is necessary to judge the AC power supply status connected to the emergency power supply. Specifically, when it is detected that the voltage of the AC power input of the emergency power supply exceeds the voltage stability threshold within a preset time, such as within 30ms, it is determined that the line controlled by the emergency power supply to which it is connected has an overload tendency, that is, it is an unstable AC power supply. At this time, the power supply of the access control power supply is switched from the emergency power supply to the access control power supply according to the second control signal, and the source of the AC voltage supply circuit of the access control power supply is further controlled to be connected to the access control power supply according to the second control signal.

[0038] It should be noted that step 103 and step 104 can be implemented in a parallel relationship, that is, the corresponding power switching operation can be performed only according to the first control signal or the second control signal, or they can be a succession relationship, that is, after switching to the emergency power supply according to the first control signal, it can also be further switched according to the second control signal.

[0039] As a preferred embodiment, Figure 2 In the circuit diagram shown, the AC voltage supply circuit of the access control power supply (not shown in the figure) is connected to the emergency power supply through an additional TVS diode. Considering that when the above-mentioned emergency power supply is connected to the AC voltage supply circuit of the access control power supply, the intermediate circuit will present a variable voltage, so the voltage supplied by the emergency power supply may become much higher than the voltage required by the access control power supply. In order to avoid the biological voltage overshoot provided by this emergency power supply, a TVS diode (Transient Voltage Suppression Diode) is added therein. The TVS diode can suppress transient voltage peaks and provide better voltage protection. That is, in an emergency, the emergency power supply to the AC circuit can be supplied under the suppression of the TVS diode. In other embodiments, power diodes can also be used instead.

[0040] Embodiment 2

[0041] See also Figure 3 , Figure 3The present invention discloses another method for supplying power to a door access control system. The present invention discloses another method for supplying power to a door access control system. The present invention discloses another method for supplying power to a door access control system. The present invention discloses another method for supplying power to a door access control system. The present invention discloses another method for supplying power to a door access control system. The present invention discloses another method for supplying power to a door access control system. The present invention discloses another method for supplying power to a door access control system. The present invention discloses another method for supplying power to a door access control system. Figure 3 As shown, the access control power supply method may include the following operations:

[0042] Step 201: monitoring feedback information of an AC voltage supply circuit of a door access power supply.

[0043] Step 202: Generate a third control signal based on the feedback information.

[0044] The implementation of step 201 and step 202 is substantially the same as that of step 101 and step 102 described above, and will not be described in detail herein.

[0045] Step 203: If the AC power input from the access control power supply exceeds a preset voltage safety threshold, a third control signal is executed to connect the charging thread of the access control power supply.

[0046] Among them, the preset voltage safety threshold is a threshold value that is selected according to the scene setting of the access control work and is conducive to the safety of the access control voltage supply. Unlike the above-mentioned voltage stability threshold, the range of the voltage safety threshold is more flexible. Because the third control signal in this step is based on the charging thread of the access control power supply, the priority is lower than the above-mentioned emergency state scenario, that is, when the access control power supply is stabilized on the basis of the above, the third control signal is selected to execute, then the setting of the voltage safety threshold is higher than the setting of the voltage stability threshold. Generally, the upper limit of the voltage stability threshold +5V is selected in practical applications. In this way, the charging operation can be performed on the basis of keeping the access control power supply uninterrupted and stable.

[0047] In other preferred embodiments, when executing the first control signal, the second control signal, and the third control signal, the access control power supply is supplied with an instantaneous AC power supply for suppressing voltage drops generated by the AC voltage supply circuit of the access control power supply using a diode isolation. Due to the special requirements of the access control power supply relative to the traditional power supply, its voltage conversion converts 220V AC into 12V DC, so when the access control power supply is connected to the emergency power supply or charged, a large current will be generated when it is connected or disconnected instantaneously. Therefore, the diode set in the above steps is also used to isolate the AC voltage supply circuit of the access control power supply, and the instantaneous AC power supply for suppressing voltage drops is generated, that is, when switching, it can supply a current that instantly offsets this change. In addition, the diode can also be replaced by a capacitor element as an isolated application device.

[0048] In other preferred embodiments, when executing the first control signal, the second control signal, and the third control signal, the current power supply status information is generated and saved in the power supply control database. Due to the overload, power outage, etc., which may cause the unstable power supply to the access control power supply, the data recorded in the access control system is lost or disordered. In order to prevent this situation, the AC power input or adjusted when executing the first control signal, the second control signal, and the third control signal is saved and recorded in real time to prevent data loss during the execution process.

[0049] Embodiment 3

[0050] See also Figure 4 , Figure 4 The schematic diagram of the framework of a power supply system for access control disclosed in an embodiment of the present invention. The power supply system for access control can be applied to access control systems of banks, hotels, parking lot management, computer rooms, armories, confidential rooms, offices, intelligent communities and factories. The present invention does not limit the application scenarios of the power supply system for access control. Figure 4 As shown, the access control power supply system may include:

[0051] Access control power supply 31, emergency power supply 32, monitoring module 33, control module 34 and judgment module 35. Access control power supply 31 is an independent power supply system built into the access control system and can be connected to an external network for control, and emergency power supply 32 is an independent storage battery built into the access control system and can operate independently offline.

[0052] Specifically, the monitoring module 33 is used to monitor the feedback information of the AC voltage supply circuit of the access control power supply. When using the external network control, it is mainly to control the on / off state of its relay. In order to obtain the voltage state information of the access control power supply, it can be implemented as detecting and monitoring the voltage between the AC voltage supply circuit and the relay. The DC voltage supply circuit is not monitored because, in the access control power supply, the 220V AC power supply supplied to the access control power supply needs to be converted into a 12V / 100A DC power supply. In this conversion process, it is easy to cause mismonitoring and cause the actual state to be inconsistent, and it has a delay. The feedback information of the monitoring AC voltage supply circuit can specifically include the voltage value, current value, etc. of the access control power supply.

[0053] Specifically, the control module 34 is used to generate a first control signal / a second control signal based on feedback information; the judgment module is used to execute a first control signal to switch the power supply of the access control power supply from the access control power supply to the emergency power supply when the AC power input of the access control power supply exceeds a preset first voltage stability threshold within a preset time; and execute a second control signal to switch the power supply of the access control power supply from the emergency power supply to the access control power supply when the AC power input of the emergency power supply exceeds a preset second voltage stability threshold within a preset time. The preset voltage stability threshold is set according to the scene of the access control work, such as setting the voltage stability threshold between 12v and 16V in scenes with high security requirements such as banks and government offices, and setting the voltage stability threshold between 14v and 18V for scenes with not too high security requirements such as schools and communities.

[0054] When the judgment module 35 detects that the voltage of the AC power input of the access control power supply exceeds the voltage stability threshold within a preset time, such as within 20ms, it is determined that the line controlled by its external network power supply has a tendency to disconnect, that is, it is an unstable AC power supply. At this time, the power supply of the access control power supply is switched from the access control power supply to the emergency power supply according to the first control signal, and the source of the AC voltage supply circuit of the access control power supply is further controlled to be connected to the emergency power supply according to the first control signal.

[0055] In a preferred embodiment, the emergency power supply can be set to one or more. When connected to the emergency power supply, the proximal emergency power supply can be preferentially selected, or one of the multiple emergency power supplies can be switched arbitrarily. Since the configuration of the emergency power supply is generally high voltage and high power, if a power supply with low voltage requirements such as the access control power supply is connected to the emergency power supply for a long time, it is easy to cause power overload and burn out of components. Therefore, it is necessary to judge the AC power supply connected to the emergency power supply. Specifically, when it is detected that the voltage of the AC power input of the emergency power supply exceeds the voltage stability threshold within a preset time, such as within 30ms, it is determined that the line controlled by the emergency power supply to which it is connected has an overload tendency, that is, it is an unstable AC power supply. At this time, the power supply of the access control power supply is switched from the emergency power supply to the access control power supply according to the second control signal, and the source of the AC voltage supply circuit of the access control power supply is further controlled to be connected to the access control power supply according to the second control signal.

[0056] In addition, the control module 34 is also used to generate a third control signal based on the feedback information; the judgment module 35 is also used to execute the third control signal to connect the charging thread of the access control power supply when the AC power input by the access control power supply exceeds the preset voltage safety threshold. Among them, the preset voltage safety threshold is a threshold value that is selected according to the scene setting of the access control work and is conducive to the safety of the access control voltage supply. Unlike the above-mentioned voltage stability threshold, the object anchored by the range of the voltage safety threshold is more flexible. Because the third control signal in this step is based on the charging thread of the access control power supply, the priority is lower than the above-mentioned emergency state scenario, that is, when the access control power supply is stabilized on the basis of the above, the third control signal is selected to be executed, then the setting of the voltage safety threshold is higher than the setting of the voltage stability threshold. Generally, the upper limit of the voltage stability threshold +5V is selected in practical applications. In this way, the charging operation can be performed on the basis of keeping the access control power supply uninterrupted and stable.

[0057] In a preferred embodiment, the system also includes a transient control module 36. The transient control module 36 is used to supply the access control power supply with a transient AC power supply for suppressing voltage drops generated by the AC voltage supply circuit of the access control power supply isolated by a diode when executing the first control signal, the second control signal, and the third control signal. Due to the special requirements of the access control power supply relative to the traditional power supply, its voltage conversion converts 220V AC power into 12V DC power. Then, when the access control power supply is connected to the emergency power supply or charged, a large current will be generated when it is connected or disconnected instantaneously. Therefore, the diode set in the above steps is also used to isolate the AC voltage supply circuit of the access control power supply to generate a transient AC power supply for suppressing voltage drops, that is, when switching, it can supply a current that instantly offsets this change. In addition, the diode can also be replaced by a capacitor element as an isolated application device.

[0058] In a preferred embodiment, considering that when the above-mentioned emergency power supply is connected to the AC voltage supply circuit of the access control power supply, the intermediate circuit thereof will present a variable voltage, so the voltage supplied by the emergency power supply may become much higher than the voltage required by the access control power supply. In order to avoid the biological voltage overshoot provided by the emergency power supply, a TVS diode (Transient Voltage Suppression Diode) is added therein. The TVS diode can suppress the transient voltage peak and provide better voltage protection. That is, in an emergency, the emergency power supply to the AC circuit can be supplied under the suppression of the TVS diode. In other embodiments, a power diode can also be used instead.

[0059] In addition, the system also includes a power control database. When executing the first control signal, the second control signal, and the third control signal, the current power state information is generated and saved in the power control database. Due to the unstable power supply to the access control power supply due to overload, power outage, etc., the data recorded in the access control system is lost or disordered. In order to prevent this situation, the AC power input or adjusted when executing the first control signal, the second control signal, and the third control signal is saved and recorded in real time to prevent data loss during the execution process.

[0060] Embodiment 4

[0061] See also Figure 5 , Figure 5 : is a schematic diagram of the structure of a door access control power supply device disclosed in an embodiment of the present invention. Figure 5 The described device can be used in access control systems of banks, hotels, parking lot management, computer rooms, armories, confidential rooms, offices, intelligent communities and factories. The embodiment of the present invention does not limit the application scenarios of the access control power supply system. Figure 5 As shown, the device may include:

[0062] A memory 401 storing executable program codes;

[0063] a processor 402 coupled to a memory 4401;

[0064] The processor 402 calls the executable program code stored in the memory 401 to execute the described access control power supply method.

[0065] Embodiment 5

[0066] An embodiment of the present invention discloses a computer-readable storage medium storing a computer program for electronic data exchange, wherein the computer program enables a computer to execute the described access control power supply method.

[0067] Embodiment 6

[0068] An embodiment of the present invention discloses a computer program product, which includes a non-transitory computer-readable storage medium storing a computer program, and the computer program is operable to enable a computer to execute the described access control power supply method.

[0069] The embodiments described above are only illustrative, wherein the modules described as separate components may or may not be physically separated, and the components displayed as modules may or may not be physical modules, i.e., they may be located in one place, or they may be distributed on multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Those of ordinary skill in the art may understand and implement it without paying creative labor.

[0070] Through the specific description of the above embodiments, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on such an understanding, the above technical solution can be essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, and the storage medium includes a read-only memory (ROM), a random access memory (RAM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), a one-time programmable read-only memory (OTPROM), an electronically erasable rewritable read-only memory (EEPROM), a compact disc (CD-ROM) or other optical disc storage, magnetic disk storage, magnetic tape storage, or any other computer-readable medium that can be used to carry or store data.

[0071] Finally, it should be noted that the access control power supply method and system disclosed in the embodiment of the present invention discloses only the preferred embodiments of the present invention, which are only used to illustrate the technical solution of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for supplying access control power, characterized in that: The method is applied to a door access control power supply system, the door access control power supply system at least comprising a door access control power supply and an emergency power supply, and the method comprises: Monitor the feedback information of the AC voltage supply circuit of the access control power supply; Generate a first control signal / a second control signal / a third control signal based on the feedback information, and execute the following thread: If the AC power input from the access control power supply exceeds a preset first voltage stability threshold within a preset time, executing the first control signal to switch the current power supply of the access control supply system from the access control power supply to the emergency power supply; If the DC power input from the emergency power supply exceeds the preset second voltage stability threshold within the preset time, the second control signal is executed to switch the current power supply of the access control supply system from the emergency power supply to the access control power supply; if the AC power input from the access control power supply exceeds the preset voltage safety threshold, the third control signal is executed to turn on the charging thread of the access control power supply; Among them, when executing the first control signal, the second control signal, and the third control signal, the access control power supply is supplied with an instantaneous AC power supply for suppressing voltage drops, which is generated by the AC voltage supply circuit of the access control power supply isolated by a diode; the AC voltage supply circuit of the access control power supply is connected to the emergency power supply through an additional TVS diode.

2. The access control power supply method according to claim 1, characterized in that: The method further comprises: When the first control signal, the second control signal, and the third control signal are executed, current power state information is generated and saved in a power control database.

3. A door access power supply system, characterized in that: The system comprises: Access control power supply; Emergency power supply; A monitoring module, used to monitor feedback information of the AC voltage supply circuit of the access control power supply; A control module, configured to generate a first control signal / a second control signal / a third control signal based on the feedback information; The judgment module is used to execute the first control signal to switch the current power supply of the access control supply system from the access control power supply to the emergency power supply when the AC power supply input of the access control power supply exceeds the preset first voltage stability threshold within a preset time; execute the second control signal to switch the current power supply of the access control supply system from the emergency power supply to the access control power supply when the DC power supply input of the emergency power supply exceeds the preset second voltage stability threshold within a preset time; execute the third control signal to connect the charging thread of the access control power supply when the AC power supply input of the access control power supply exceeds the preset voltage safety threshold; wherein the system also includes: The instantaneous control module is used to supply the access control power supply with an instantaneous AC power supply for suppressing voltage drops, which is generated by the AC voltage supply circuit of the access control power supply isolated by a diode when executing the first control signal, the second control signal, and the third control signal; the AC voltage supply circuit of the access control power supply is connected to the emergency power supply through an additional TVS diode.

4. The access control power supply system according to claim 3, characterized in that: The system further comprises: The power control database is used to obtain and store current power status information when executing the first control signal, the second control signal, and the third control signal.

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