Multi-purpose power supply circuit and access control system

Abstract

The present application provides a multi-purpose power supply circuit and an access control system. The multi-purpose power supply circuit outputs the first electric energy when the Ethernet power receiving module receives the first electric energy provided by the POE power supply device. The Ethernet power supply module is used to receive and output the first electric energy. If the bidirectional power transmission module receives the second electric energy provided by the DC power supply device, it outputs the second electric energy. The power transmission module is used to receive the second electric energy. The detection and control module is used to control the bidirectional power transmission module to receive and output the first electric energy if only the Ethernet power receiving module is detected to receive the first electric energy; if only the bidirectional power transmission module is detected to receive the second electric energy, it controls the power transmission module to transmit the second electric energy to the Ethernet power supply module so that the Ethernet power supply module outputs the second electric energy. In this way, through the Ethernet power receiving module and the bidirectional power transmission module, various external power supply devices can be adapted for power transmission, eliminating the need for users to install additional matching power supply devices, thus reducing the power supply construction cost.

Description

Technical Field

[0001] The present application relates to the technical field of power supply, and particularly to a multi-purpose power supply circuit and an access control system. Background Art

[0002] The Internet of Things technology has occupied an important position in social life. For some Internet of Things systems, such as an access control system including a system controller, a terminal controller, a card reader, a face recognition module, and various electric locks, the mainstream power supply solution is mainly AC-DC power supply that converts 220V AC mains into 12V DC power. With the maturity of Power over Ethernet (POE) technology, the POE method can also be used to supply power to the entire system.

[0003] However, for large-scale systems, using AC-DC power supply to supply power to the entire system requires special wiring for power lines, which is complex and has a high construction cost; while for small and medium-scale systems, using the POE method to supply power requires bearing the cost of adding a POE switch. Summary of the Invention

[0004] The present application provides a multi-purpose power supply circuit and an access control system that can reduce the power supply construction cost.

[0005] A multi-purpose power supply circuit includes:

[0006] An Ethernet power receiving module, configured to connect to a POE power supply device and output the first electric energy if the first electric energy provided by the POE power supply device is received;

[0007] An Ethernet power supply module, connected to the Ethernet power receiving module, configured to receive and output the first electric energy;

[0008] A bidirectional power transmission module, configured to connect to a DC power supply device and connect to the Ethernet power receiving module, and output the second electric energy if the second electric energy provided by the DC power supply device is received;

[0009] A power transmission module, connected to the Ethernet power supply module and at least connected to the bidirectional power transmission module, configured to receive the second electric energy;

[0010] A detection and control module, respectively connected to the Ethernet power receiving module, the bidirectional power transmission module, and the power transmission module, and configured to: if only the first electric energy received by the Ethernet power receiving module is detected, control the bidirectional power transmission module to receive and output the first electric energy; if only the second electric energy received by the bidirectional power transmission module is detected, control the power transmission module to transmit the second electric energy to the Ethernet power supply module for the Ethernet power supply module to output the second electric energy.

[0011] In one embodiment, the detection and control module includes:

[0012] A detection unit, which is respectively connected to the Ethernet power receiving module and the bidirectional power transmission module, and is used for detecting the first electric energy and the second electric energy;

[0013] A control unit, which is respectively connected to the bidirectional power transmission module, the power transmission module and the detection unit, and is used for controlling the bidirectional power transmission module to receive and output the first electric energy if only the first electric energy is detected; if only the second electric energy is detected, controlling the power transmission module to transmit the second electric energy to the Ethernet power supply module.

[0014] In one embodiment, the power transmission module includes:

[0015] A power transmission unit, which is connected to the bidirectional power transmission module and is used for receiving the second electric energy;

[0016] A boosting unit, which is respectively connected to the power transmission unit, the Ethernet power supply module and the control unit;

[0017] The control unit is further used for controlling the boosting unit to perform boosting processing on the second electric energy and transmitting it to the Ethernet power supply module.

[0018] In one embodiment, the power transmission unit is also respectively connected to the Ethernet power receiving module and the control unit, and is used for receiving the first electric energy and transmitting at least one of the first electric energy and the second electric energy to the control unit to supply power to the control unit.

[0019] In one embodiment, the power transmission module further includes:

[0020] A bucking unit, which is respectively connected to the power transmission unit and the control unit, and is used for performing bucking processing on the first electric energy and the second electric energy and then transmitting them to the control unit.

[0021] In one embodiment, the power transmission unit includes a diode D11 and a diode D12. The anode of the diode D11 is connected to the bidirectional power transmission module, the anode of the diode D12 is connected to the Ethernet power receiving module, the cathodes of the diode D11 and the diode D12 are commonly connected and are respectively connected to the boosting unit and the bucking unit.

[0022] In one embodiment, the Ethernet power supply module is provided with a plurality of Ethernet ports to provide multi-terminal output of the first electric energy or the second electric energy.

[0023] In one embodiment, the bidirectional power transmission module includes a resistor R21, a resistor R22, a resistor R23, a resistor R24, a resistor R25, a first overcurrent protection element, a switching transistor Q1, a switching transistor Q2, a switching transistor Q3, a switching transistor Q4, a diode D21, and a bidirectional connection terminal J1;

[0024] A first end of the resistor R21 is connected to the control unit, and a second end of the resistor R21, a first end of the resistor R22, and a control end of the switching transistor Q1 are commonly connected; a second end of the resistor R22, a first connection end of the switching transistor Q1, and a ground terminal are commonly connected; a second connection end of the switching transistor Q1 is connected to a first end of the resistor R23, and a second end of the resistor R23 is commonly connected to a control end of the switching transistor Q2, a first end of the resistor R24, and a control end of the switching transistor Q3; a first connection end of the switching transistor Q3 is connected to the Ethernet power receiving module, and a second connection end of the switching transistor Q3 is commonly connected to a second end of the resistor R24 and a first connection end of the switching transistor Q2; a second connection end of the switching transistor Q2, a first connection end of the bidirectional connection terminal J1, and a first end of the first overcurrent protection element are commonly connected; a second connection end of the bidirectional connection terminal J1 is connected to the ground terminal; a second end of the first overcurrent protection element, a cathode of the diode D21, and a first connection end of the switching transistor Q4 are commonly connected, and a control end of the switching transistor Q4 is connected to a first end of the resistor R25; a second end of the resistor R25 and an anode of the diode D21 are commonly connected to the ground terminal; a second connection end of the switching transistor Q4 is respectively connected to the detection unit and the power transmission module.

[0025] In one embodiment, the bidirectional power transmission module further includes:

[0026] A second overcurrent protection element, a first end of the second overcurrent protection element is connected to a second connection end of the switching transistor Q2, and a second end of the second overcurrent protection element is connected to a first connection end of the bidirectional connection terminal J1 and a first end of the first overcurrent protection element.

[0027] In one embodiment, the bidirectional power transmission module further includes a resistor R26 and a capacitor C21;

[0028] A first end of the resistor R26 is respectively connected to a second end of the first overcurrent protection element, a cathode of the diode D21, and a first connection end of the switching transistor Q4, a second end of the resistor R26 is connected to a first end of the capacitor C21, and a second end of the capacitor C21 is connected to the ground terminal.

[0029] In one embodiment, the bidirectional power transmission module includes a resistor R31, a resistor R32, a switching transistor Q5, a diode D31, a capacitor C31, a relay, a third overcurrent protection component, and a bidirectional connection terminal J2;

[0030] A first end of the resistor R31 is connected to the control unit, and a second end of the resistor R31 and a first end of the resistor R32 are commonly connected and connected to a control end of the switching transistor Q5; a first connection end of the switching transistor Q5 and a second end of the resistor R32 are commonly connected and connected to the ground end; a second connection end of the switching transistor Q5 and an anode of the diode D31 are commonly connected and connected to a first coil end of the relay, and a cathode of the diode D31, a second coil end of the relay, and a first end of the capacitor C31 are commonly connected and receive a first power supply voltage; a second end of the capacitor C31 is connected to the ground end; a common end of the relay is connected to a first connection end of the bidirectional connection terminal J2, a normally closed end of the relay is connected to a first end of the third overcurrent protection component, and a normally open end of the relay is connected to the Ethernet powered module; a second connection end of the bidirectional connection terminal J2 is connected to the ground end; a second end of the third overcurrent protection component is connected to the power transmission module.

[0031] In one embodiment, the bidirectional power transmission module further includes:

[0032] A fourth overcurrent protection component, a first end of the fourth overcurrent protection component is connected to the Ethernet powered module, and a second end of the fourth overcurrent protection component is connected to a normally open end of the relay.

[0033] In one embodiment, the bidirectional power transmission module further includes a diode D32, a resistor R33, and a capacitor C32;

[0034] A first end of the resistor R33 is respectively connected to a second end of the third overcurrent protection component, a cathode of the diode D32, and the power transmission module, a second end of the resistor R33 is connected to a first end of the capacitor C32, a second end of the capacitor C32 is connected to the ground end; an anode of the diode D32 is connected to the ground end.

[0035] An access control system includes:

[0036] Access control devices;

[0037] And the multi-purpose power supply circuit according to any one of the above embodiments;

[0038] Wherein the multi-purpose power supply circuit is connected to the access control device for supplying power to the access control device.

[0039] In one embodiment, when the multi-purpose power supply circuit includes the control unit, the control unit is the same unit as the access control unit of the access control device.

[0040] When the Ethernet power receiving module receives the first electric energy provided by the POE power supply device, the above-mentioned multi-purpose power supply circuit outputs the first electric energy. The Ethernet power supply module is used to receive and output the first electric energy. If the bidirectional power transmission module receives the second electric energy provided by the DC power supply device, it outputs the second electric energy. The power transmission module is used to receive the second electric energy. The detection and control module is used to control the bidirectional power transmission module to receive and output the first electric energy if only the Ethernet power receiving module is detected to receive the first electric energy; if only the bidirectional power transmission module is detected to receive the second electric energy, it controls the power transmission module to transmit the second electric energy to the Ethernet power supply module for the Ethernet power supply module to output the second electric energy. In this way, through the Ethernet power receiving module and the bidirectional power transmission module, various external power supply devices can be adapted for power transmission without the user having to install a matching power supply device additionally, reducing the power supply setup cost. Brief Description of the Drawings

[0041] Figure 1 Structural block diagram of the multi-purpose power supply circuit according to an embodiment of the present application;

[0042] Figure 2 Structural block diagram of the multi-purpose power supply circuit according to another embodiment of the present application;

[0043] Figure 3 Structural block diagram of the multi-purpose power supply circuit according to another embodiment of the present application;

[0044] Figure 4 Structural block diagram of the multi-purpose power supply circuit according to another embodiment of the present application;

[0045] Figure 5 Structural block diagram of the multi-purpose power supply circuit according to another embodiment of the present application;

[0046] Figure 6 Structural block diagram of the multi-purpose power supply circuit according to another embodiment of the present application;

[0047] Figure 7 Circuit structure diagram of the bidirectional power transmission module according to an embodiment of the present application;

[0048] Figure 8 Circuit structure diagram of the bidirectional power transmission module according to another embodiment of the present application;

[0049] Figure 9 Circuit structure diagram of the detection unit according to an embodiment of the present application;

[0050] Figure 10 Circuit structure diagram of the bidirectional power transmission module according to another embodiment of the present application;

[0051] Figure 11 The circuit structure diagram of the bidirectional power transmission module according to another embodiment of the present application;

[0052] Figure 12 The circuit structure diagram of the detection unit according to another embodiment of the present application. Specific embodiments

[0053] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0054] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0055] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present application are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly. The described connection can be a direct connection or an indirect connection.

[0056] In addition, the descriptions such as "first" and "second" in the present application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions appears to be contradictory or unable to be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present application.

[0057] Figure 1 The structural block diagram of the multi-purpose power supply circuit for an embodiment is as Figure 1As shown in the figure, the multi-purpose power supply circuit includes an Ethernet power receiving module 110, an Ethernet power supply module 120, a bidirectional power transmission module 130, a power transmission module 140, and a detection and control module 150. The Ethernet power supply module 120 is used to connect to the POE power supply device 100 and output the first electric energy if it receives the first electric energy provided by the POE power supply device 100. The Ethernet power supply module 120 is connected to the Ethernet power receiving module 110 and is used to receive and output the first electric energy. The bidirectional power transmission module 130 is used to connect to the DC power supply device 200 and is connected to the Ethernet power receiving module 110, and is used to output the second electric energy if it receives the second electric energy provided by the DC power supply device 200. The power transmission module 140 is connected to the Ethernet power supply module 120 and is at least connected to the bidirectional power transmission module 130, and is used to receive the second electric energy. The detection and control module 150 is respectively connected to the Ethernet power receiving module 110, the bidirectional power transmission module 130, and the power transmission module 140, and is used to: if only the Ethernet power receiving module 110 is detected to receive the first electric energy, control the bidirectional power transmission module 130 to receive and output the first electric energy; if only the bidirectional power transmission module 130 is detected to receive the second electric energy, control the power transmission module 140 to transmit the second electric energy to the Ethernet power supply module 120, so that the Ethernet power supply module 120 outputs the second electric energy.

[0058] It can be understood that the Ethernet power receiving module 110 and the bidirectional power transmission module 130 in this embodiment can both be used as power input ends. Among them, the Ethernet power receiving module 110 can be connected to the POE power supply device 100 through a twisted pair to transmit both Ethernet signals and electric energy at the same time. Therefore, when there is an external POE power supply device 100, after protocol handshake, detection, and power allocation confirmation, the Ethernet power receiving module 110 can receive the first electric energy provided by the POE power supply device 100 and then output it. The bidirectional power transmission module 130 is used to connect to the external DC power supply device 200 to receive the second electric energy provided by the DC power supply device 200. Among them, the POE power supply device 100 can be a router or a switch with POE power supply function.

[0059] Specifically, if the Ethernet power receiving module 110 receives the first electric energy from the POE power supply device 100, and the bidirectional power transmission module 130 does not receive the second electric energy from the DC power supply device 200, after outputting the first electric energy, on the one hand, the Ethernet power supply module 120 receives the first electric energy and further outputs it externally, thus realizing Ethernet power supply; on the other hand, the bidirectional power transmission module 130 can also be used to connect to external electrical devices. When the detection and control module 150 detects that the Ethernet power receiving module 110 receives the first electric energy, it controls the bidirectional power transmission module 130 to be in the output state, receives and outputs the first electric energy output by the Ethernet power receiving module 110, thus realizing the DC power supply of external electrical devices; among them, the port of the bidirectional power transmission module 130 for outputting the first electric energy is the same port as the port of the bidirectional power transmission module 130 for connecting to the DC power supply device 200. Therefore, when the user only has the POE power supply device 100, the multi-purpose power supply circuit of this embodiment can receive the electric energy from the POE power supply device 100, and thus can perform Ethernet power supply to external devices while also performing ordinary DC power supply. Among them, the Ethernet power receiving module 110 can have a voltage regulation function. The voltage of the first electric energy received from the POE power supply device 100 by it is usually 48V, while the voltage of the electric energy received and output by the bidirectional power transmission module 130 is 12V. Therefore, before transmitting the first electric energy to the bidirectional power transmission module 130, the Ethernet power receiving module 110 also performs a step-down process on the voltage of the first electric energy to reach the voltage that the bidirectional power transmission module 130 can receive.

[0060] If the bidirectional power transmission module 130 receives the second electric energy from the DC power supply device 200, and the Ethernet power receiving module 110 does not receive the first electric energy from the POE power supply device 100, then the bidirectional power transmission module 130 directly outputs the second electric energy. The power transmission module 140 is connected to the bidirectional power transmission module 130, so that it can receive the second electric energy. At the same time, when the detection and control module 150 detects that the bidirectional power transmission module 130 receives the second electric energy provided by the DC power supply device 200, it controls the power transmission module 140 to transmit the second electric energy to the Ethernet power supply module 120, so that the Ethernet power supply module 120 outputs the second electric energy. Therefore, when the user only has the DC power supply device 200, the multi-purpose power supply circuit of this embodiment can receive the electric energy from the DC power supply device 200, and then perform Ethernet power supply to external electrical devices through the Ethernet power supply module. Among them, the voltage of the second electric energy received by the bidirectional power transmission module 130 can be 12V. The detection and control module 150 can be connected to the Ethernet power receiving module 110 by connecting to the connection end of the bidirectional power transmission module 130 and the Ethernet power receiving module 110 to detect whether the Ethernet power receiving module 110 receives the first electric energy.

[0061] Among them, detecting whether the Ethernet power receiving module 110 receives the first electric energy can be detecting whether there is the first electric energy at the receiving end of the Ethernet power receiving module 110 or within the Ethernet power receiving module 110; similarly, detecting whether the bidirectional power transmission module 130 receives the second electric energy can be detecting whether there is the second electric energy at the receiving end of the bidirectional power transmission module 130 or within the bidirectional power transmission module 130.

[0062] The power transmission module 140 is at least connected to the bidirectional power transmission module 130 to receive the second electric energy. In addition, it can also be connected to other power supply modules to obtain electric energy, such as the Ethernet power receiving module 110.

[0063] Since the bidirectional power transmission module 130 can transmit power outward when powered by the POE power supply device 100 and receive electric energy from the outside when powered by the DC power supply device 200, the overall function of the circuit can be enriched without increasing the circuit complexity, and its application range can be expanded. Among them, the bidirectional power transmission module 130 can be connected to a power adapter to process the voltage of the first electric energy and then supply power to external electrical devices.

[0064] In one embodiment, the Ethernet power supply module 120 can have multiple output ports to achieve multi-terminal output of the first electric energy or the second electric energy to supply power to multiple electrical devices respectively. In one embodiment, the multi-purpose power supply circuit of this embodiment can be used in an access control system including a system controller, a terminal controller, a card reader, a face recognition module, and various electric locks to supply power to each part of the circuit in the access control system.

[0065] Since the Ethernet power receiving module 110 and the bidirectional power transmission module 130 are both provided in this embodiment, it can be applicable to the scenario where there is only one of the DC power supply device 200 and the POE power supply device 100 on site at the same time. Compared with the existing power supply circuit with only one power supply method, the multi-purpose power supply circuit of this embodiment can adapt to a variety of external electrical devices, eliminating the need for users to install additional matching power supply devices, avoiding dedicated wiring of power supply devices, improving power supply flexibility, and reducing power supply construction costs.

[0066] In the case where the multi - purpose power supply circuit according to an embodiment of the present invention receives the first electric energy provided by the power - over - Ethernet (POE) power supply device 100 through the Ethernet power - receiving module 110, it outputs the first electric energy. The Ethernet power - supply module 120 is used to receive and output the first electric energy. If the bidirectional power - transmission module 130 receives the second electric energy provided by the DC power - supply device 200, it outputs the second electric energy. The power - transmission module 140 is used to receive the second electric energy. The detection and control module 150 is used to control the bidirectional power - transmission module 130 to receive and output the first electric energy if only the Ethernet power - receiving module 110 is detected to receive the first electric energy; if only the bidirectional power - transmission module 130 is detected to receive the second electric energy, it controls the power - transmission module 140 to transmit the second electric energy to the Ethernet power - supply module 120, so that the Ethernet power - supply module 120 outputs the second electric energy. In this way, through the Ethernet power - receiving module 110 and the bidirectional power - transmission module 130, it is possible to adapt to a variety of external power - supply devices for power transmission, without the user having to install a matching power - supply device additionally, and also avoiding the dedicated wiring of the power - supply device, improving the power - supply flexibility, and reducing the power - supply construction cost.

[0067] In one embodiment, if the detection and control module 150 simultaneously detects that the Ethernet power - receiving module 110 receives the first electric energy and the bidirectional power - transmission module 130 receives the second electric energy, it does not perform the actions of controlling the bidirectional power - transmission module 130 and the power - transmission module 140. It can be understood that in this case, on the one hand, the Ethernet power - receiving module 110 receives and outputs the first electric energy to the Ethernet power - supply module 120 to supply power externally through the Ethernet power - supply module 120, and on the other hand, the bidirectional power - transmission module 130 outputs the second electric energy to the power - transmission module 140.

[0068] Therefore, the multi - purpose power supply circuit adopting the above - mentioned embodiment can not only be applicable to a variety of power - supply devices, improve the power - supply flexibility, but also reasonably select one of the electric energies for output when receiving power from a variety of power - supply devices simultaneously, with high safety.

[0069] In one embodiment, as Figure 2 shown, the detection and control module 150 may include a detection unit 151 and a control unit 152. The detection unit 151 is respectively connected to the Ethernet power - receiving module 110 and the bidirectional power - transmission module 130, and is used to detect the first electric energy and the second electric energy; the control unit 152 is respectively connected to the bidirectional power - transmission module 130, the power - transmission module 140 and the detection unit 151, and is used to control the bidirectional power - transmission module 130 to receive and output the first electric energy if only the first electric energy is detected; if only the second electric energy is detected, it controls the power - transmission module 140 to transmit the second electric energy to the Ethernet power - supply module 120.

[0070] It can be understood that when the first electric energy is detected, the detection unit 151 can generate information indicating the detection of the first electric energy, and then send it to the control unit 152. The control unit 152 controls the bidirectional power transmission module 130 to receive and output the first electric energy to achieve external DC power supply. Similarly, when the second electric energy is detected, the detection unit 151 can generate information indicating the detection of the second electric energy, and then send it to the control unit 152. Since the bidirectional power transmission module 130 directly outputs the second electric energy to the power transmission module 140 when receiving the second electric energy, the control unit 152 controls the power transmission module 140 to transmit the second electric energy to the Ethernet power supply module 120, thereby achieving external Ethernet power supply.

[0071] In one embodiment, as Figure 3 shown, the power transmission module 140 may include a power transmission unit 141 and a boost unit 142. The power transmission unit 141 is connected to the bidirectional power transmission module 130 and is used to receive the second electric energy. The boost unit 142 is respectively connected to the power transmission unit 141, the Ethernet power supply module 120, and the control unit 152. The control unit 152 is further used to control the boost unit 142 to perform boost processing on the second electric energy and transmit it to the Ethernet power supply module 120.

[0072] It can be understood that if the bidirectional power transmission module 130 receives the second electric energy provided by the DC power supply device 200, after outputting the second electric energy, the power transmission unit 141 will receive the second electric energy and then transmit it to the boost unit 142 to boost the voltage of the second electric energy to the voltage expected by the Ethernet power supply module 120, and then output it externally through the Ethernet power supply module 120.

[0073] Specifically, under normal circumstances, the voltage of the first electric energy output by the POE power supply device 100 is 48V, and the voltage of the electric energy provided by the Ethernet power supply module 120 to the outside is also 48V. Therefore, the Ethernet powered device 110 can directly transmit the first electric energy to the Ethernet power supply module 120 so that the Ethernet power supply module 120 can directly output to the outside. The second electric energy received by the bidirectional power transmission module 130 is usually 12V. To reach the required 48V voltage of the Ethernet power supply module 120, the boost unit 142 can be set to perform boosting.

[0074] In one embodiment, as Figure 4 shown, the power transmission unit 141 is also respectively connected to the Ethernet powered device 110 and the control unit 152, and is used to receive the first electric energy and transmit at least one of the first electric energy and the second electric energy to the control unit 152 to supply power to the control unit 152.

[0075] It can be understood that in addition to being connected to the bidirectional power transmission module 130 to receive the second electric energy, the power transmission unit 141 can also be connected to the Ethernet power receiving module 110 to receive the first electric energy when the Ethernet power receiving module 110 outputs the first electric energy. Specifically, when only the POE power supply device 100 supplies power, the power transmission unit 141 will receive the first electric energy output by the Ethernet power receiving module 110, and then transmit the second electric energy to the control unit 152 for power supply; when only the DC power supply device 200 supplies power, the power transmission unit 141 will receive the second electric energy from the bidirectional power transmission module 130, and then transmit the second electric energy to the control unit 152 for power supply; when both the POE power supply device 100 and the DC power supply device 200 supply power, on the one hand, the Ethernet power receiving module 110 will supply the first electric energy outward through the Ethernet power supply module 120, and on the other hand, transmit the first electric energy to the power transmission unit 141. The power transmission unit 141 receives the first electric energy and the second electric energy at the same time, and transmits the first electric energy and the second electric energy to the control unit 152 for power supply. In this way, it can be ensured that as long as there is any one of the DC power supply device 200 and the POE power supply device 100, the control unit 152 can receive electric energy to work normally, making full use of the existing electric energy resources; and since the control unit 152 is powered by the DC power supply device 200 and the POE power supply device 100, the control unit 152 only enters the working state when there are the DC power supply device 200 and the POE power supply device 100 externally, controlling the external power supply process. Compared with keeping the control unit 152 in the working state all the time to control the external power supply when external power supply appears, the power consumption is lower.

[0076] Among them, the voltage of the first electric energy received by the power transmission unit 141 is equal to the voltage of the second electric energy received by the bidirectional power transmission module 130. For example, both of them can be 12V. The first electric energy of the Ethernet power receiving module 110 received by the power transmission unit 141 and the first electric energy of the Ethernet power receiving module 110 received by the bidirectional power transmission module 130 have the same voltage value. Therefore, they can be output from the same output port of the Ethernet power receiving module 110.

[0077] In one embodiment, as Figure 5 shown, the power transmission module 140 further includes a buck unit 143, which is respectively connected to the power transmission unit 141 and the control unit 152, and is used to step down the first electric energy and the second electric energy and then transmit them to the control unit 152.

[0078] It can be understood that the voltage of the operating electric energy of the control unit 152 may be less than the first electric energy and the second electric energy. Therefore, a step-down unit 143 can be provided to step down the first electric energy and the second electric energy output by the power transmission unit 141 to obtain the voltage of the operating electric energy required by the control unit 152. The control unit 152 can step down both the first electric energy and the second electric energy. Among them, if the power transmission unit 141 only receives and outputs the first electric energy, the step-down unit 143 steps down the first electric energy; if the power transmission unit 141 only receives and outputs the second electric energy, the step-down unit 143 steps down the second electric energy; if the power transmission unit 141 receives and outputs the first electric energy and the second electric energy, the step-down unit 143 steps down the first electric energy and the second electric energy.

[0079] In one embodiment, as Figure 6 shown, the power transmission unit 141 includes a diode D11 and a diode D12. The anode of the diode D11 is connected to the Ethernet power receiving module 110, and the anode of the diode D12 is connected to the bidirectional power transmission module 130. The cathodes of the diode D11 and the diode D12 are commonly connected and are connected to the boost unit 142 and the step-down unit 143.

[0080] It can be understood that the Ethernet power receiving module 110 and the diode D11, and the bidirectional power transmission module 130 and the diode D12 respectively form two parallel transmission paths, which can enable when one of the first electric energy and the second electric energy is output, the electric energy is output to the step-down unit 143, and when the first electric energy and the second electric energy are output together, the first electric energy and the second electric energy are combined and output. Since the voltages of the first electric energy and the second electric energy are equal, the voltage of the electric energy output to the step-down unit 143 is still equal to the voltages of the first electric energy and the second electric energy.

[0081] In one embodiment, the Ethernet power supply module 120 is provided with a plurality of Ethernet ports to provide multi-terminal output of the first electric energy or the second electric energy.

[0082] It can be understood that expanding a plurality of Ethernet ports can meet the power consumption requirements of multiple devices and can prevent the situation where power cannot be supplied externally due to a single port failure.

[0083] In one embodiment, as Figure 7As shown, the bidirectional power transmission module 130 includes a resistor R21, a resistor R22, a resistor R23, a resistor R24, a resistor R25, a first overcurrent protection element 131, a switching transistor Q1, a switching transistor Q2, a switching transistor Q3, a switching transistor Q4, a diode D21, and a bidirectional connection terminal J1; the first end of the resistor R21 (denoted as d11 in the figure) is connected to the control unit 152, and the second end of the resistor R21, the first end of the resistor R22, and the control end of the switching transistor Q1 are commonly connected; the second end of the resistor R22, the first connection end of the switching transistor Q1 are commonly connected to the ground terminal; the second connection end of the switching transistor Q1 is connected to the first end of the resistor R23, and the second end of the resistor R23 is commonly connected to the control end of the switching transistor Q2, the first end of the resistor R24, and the control end of the switching transistor Q3; the first connection end of the switching transistor Q3 (denoted as d12 in the figure) is connected to the Ethernet power receiving module 110, and the second connection end of the switching transistor Q3 is commonly connected to the second end of the resistor R24 and the first connection end of the switching transistor Q2; the second connection end of the switching transistor Q2, the first connection end of the bidirectional connection terminal J1, and the first end of the first overcurrent protection element 131 are commonly connected; the second connection end of the bidirectional connection terminal J1 is connected to the ground terminal; the second end of the first overcurrent protection element 131, the cathode of the diode D21, and the first connection end of the switching transistor Q4 are commonly connected, and the control end of the switching transistor Q4 is connected to the first end of the resistor R25; the second end of the resistor R25, the anode of the diode D21 are commonly connected to the ground terminal; the second connection end of the switching transistor Q4 (denoted as d13 in the figure) is respectively connected to the detection unit 151 and the power transmission module 140.

[0084] It can be understood that the control unit 152 is indirectly connected to the control end of the switching transistor Q1 through the resistor R21 to control the conduction and disconnection of the switching transistor Q1. By default, the switching transistor Q1 is in the off state. At this time, the switching transistors Q2 and Q3 are off, and neither the bidirectional connection terminal J1 nor the switching transistor Q4 has an output. If only the Ethernet power receiving module 110 receives the first electric energy and the detection unit 151 detects the first electric energy, the control unit 152 controls the switching transistor Q1 to conduct, and the switching transistors Q2 and Q3 also conduct successively, so that the first electric energy received by the Ethernet power receiving module 110 can be transmitted to the bidirectional connection terminal J1, and then externally powered (where the first connection end of the bidirectional connection terminal J1 is used to connect to the input end of the external electrical device, and the second connection end is used to connect to the output end of the external electrical device). In addition, the first electric energy will also be transmitted to the switching transistor Q4 and then to the power transmission unit 141 of the power transmission module 140. When the power transmission unit 141 is connected to the control unit 152, the control unit 152 can be powered by the first electric energy. If only the bidirectional power transmission module 130 receives the second electric energy, since the switching transistor Q1 is off, the switching transistors Q2 and Q3 also remain off. The first connection end and the second connection end of the bidirectional connection terminal J1 are respectively connected to the positive and negative poles of the DC power supply device 200. The second electric energy can be input from the bidirectional connection terminal J1 and transmitted to the power transmission module 140 through the switching transistor Q4. When the Ethernet power receiving module 110 receives the first electric energy and the bidirectional power transmission module 130 receives the second electric energy, the control unit 152 does not perform the actions of controlling the bidirectional power transmission module 130 and the power transmission module 140. At this time, the switching transistors Q1, Q2, and Q3 remain off, the first electric energy does not flow in, and the second electric energy flows in from the bidirectional connection terminal J1 and is transmitted to the power transmission module 140 through the switching transistor Q4.

[0085] Among them, the first overcurrent protection element 131, the diode D21, and the switching transistor Q4 form an anti-reverse connection circuit. Specifically, when the bidirectional connection terminal J1 is reversely connected to the DC power supply device 200, that is, the first connection end of the bidirectional connection terminal J1 is connected to the negative end of the DC power supply device 200, the switching transistor Q4 does not conduct. At this time, the diode D21, the first overcurrent protection element 131, and the first connection end of the bidirectional connection terminal J1 form a conductive path. This conductive path has no protection resistor and the current is large. Therefore, the first overcurrent protection element 131 will disconnect the conductive path between the switching transistor Q4 and the first connection end of the bidirectional connection terminal J1. The first overcurrent protection element 131 can be a fuse, and the resistor R25 is the protection resistor for the control end of the switching transistor Q4. The diode D21 can be a Schottky diode.

[0086] In addition, as an optional implementation manner, the switching transistor Q1 can be an N-type field effect transistor, and the switching transistors Q2, Q3, and Q4 can all be P-type field effect transistors.

[0087] In one embodiment, the bidirectional power transmission module 130 may further include a second overcurrent protection element 132, such as Figure 8 As shown, the first end of the second overcurrent protection element 132 is connected to the second connection end of the switching transistor Q2, and the second end of the second overcurrent protection element 132 is connected to the first connection end of the bidirectional connection terminal J1 and the first end of the first overcurrent protection element 131.

[0088] It can be understood that the second overcurrent protection element 132 can prevent the current of the first electric energy output outward through the bidirectional connection terminal J1 from exceeding the current threshold, thereby ensuring power supply safety, where the current threshold can be set artificially.

[0089] In one embodiment, the bidirectional power transmission module 130 further includes a resistor R26 and a capacitor C21, as shown in Figure 8 As shown; the first end of the resistor R26 is respectively connected to the second end of the first overcurrent protection element 131, the cathode of the diode D21, and the first connection end of the switching transistor Q4. The second end of the resistor R26 is connected to the first end of the capacitor C21, and the second end of the capacitor C21 is connected to the ground terminal.

[0090] It can be understood that the resistor R26, the capacitor C21, and the diode D21 constitute a surge protection circuit, thereby preventing voltage and current spikes and protecting the safety of components.

[0091] In one embodiment, as shown in Figure 9 As shown, the detection unit 151 includes a resistor R41, a resistor R42, a resistor R43, a resistor R51, a resistor R52, a resistor R53, diodes D41, D42, D51, D52, and an ADC sampling unit 151a; wherein the first end of the resistor R41 (denoted as d21 in the figure) is connected to the Ethernet power receiving module 110, and the second end of the resistor R41 is respectively connected to the first end of the resistor R42, the anode of the diode D41, the cathode of the diode D42, and the first end of the resistor R43; the second end of the resistor R42 and the anode of the diode D42 are respectively connected to the ground terminal; the cathode of the diode D41 is used to receive the first protection voltage U1; the second end of the resistor R43 is connected to the first input terminal of the ADC sampling unit 151a; the first end of the resistor R51 (denoted as d22 in the figure) is connected to the bidirectional control module, and the second end of the resistor R51 is respectively connected to the first end of the resistor R52, the anode of the diode D51, the cathode of the diode D52, and the first end of the resistor R53; the second end of the resistor R52 and the anode of the diode D52 are respectively connected to the ground terminal; the cathode of the diode D51 is used to receive the second protection voltage U2; the second end of the resistor R53 is connected to the second input terminal of the ADC sampling unit 151a, and the output terminal of the ADC sampling unit 151a (denoted as d23 in the figure) is connected to the control unit 152.

[0092] It can be understood that the resistors R41 and R42 can divide the voltage of the first electric energy output by the Ethernet powered module 110, thereby reducing the voltage of the first electric energy. Further, the diode D41 can limit the voltage of the first electric energy within the first protection voltage U1 to further protect the circuit. Finally, the voltage is further reduced through the resistor R43 to achieve the purpose of ensuring the circuit safety. In addition, when the voltage of the first electric energy is negative, the diode D42 can limit the voltage of the cathode of the diode D42 to 0V, thereby realizing the negative voltage protection of the ADC sampling unit 151a.

[0093] Similarly, the resistors R51 and R52 can divide the voltage of the second electric energy output by the bidirectional control module, thereby reducing the voltage of the second electric energy. Further, the diode D51 can limit the voltage of the second electric energy within the second protection voltage U2 to further protect the circuit. Finally, the voltage is further reduced through the resistor R53 to achieve the purpose of ensuring the circuit safety. In addition, when the voltage of the second electric energy is negative, the diode D52 can limit the voltage of the cathode of the diode D52 to 0V, thereby realizing the negative voltage protection of the ADC sampling unit 151a.

[0094] Among them, the ADC sampling unit 151a can sample and obtain a digital signal for characterizing the second electric energy, which may include an ADC chip. The ADC chip has the characteristics of high precision, high conversion efficiency, and low power consumption.

[0095] In one embodiment, the ADC sampling unit 151a can be arranged in the control unit 152. In one embodiment, as Figure 10 shown, the bidirectional power transmission module 130 may include a resistor R31, a resistor R32, a switching transistor Q5, a diode D31, a capacitor C31, a relay 133, a third overcurrent protection element 134, and a bidirectional connection terminal J2. The first end of the resistor R31 (denoted as d31 in the figure) is connected to the control unit 152. The second end of the resistor R31 and the first end of the resistor R32 are commonly connected and connected to the control end of the switching transistor Q5. The first connection end of the switching transistor Q5 and the second end of the resistor R32 are commonly connected and connected to the ground terminal. The second connection end of the switching transistor Q5 and the anode of the diode D31 are commonly connected and connected to the first coil end (pin 8) of the relay 133. The cathode of the diode D31, the second coil end (pin 1) of the relay 133, and the first end of the capacitor C31 are commonly connected and receive the first power supply voltage E1. The second end of the capacitor C31 is connected to the ground terminal. The common end (pin 6) of the relay 133 is connected to the first connection end of the bidirectional connection terminal J2. The normally closed end (pin 7) of the relay 133 is connected to the first end of the third overcurrent protection element 134. The normally open end (pin 5) of the relay 133 is connected to the Ethernet powered module 110. The second connection end of the bidirectional connection terminal J2 is connected to the ground terminal. The second end of the third overcurrent protection element 134 (denoted as d31 in the figure) is connected to the power transmission module 140.

[0096] It can be understood that the control unit 152 is indirectly connected to the control end of the switch tube Q5 through the resistor R32 to control the on and off of the switch tube Q5. By default, the switch tube Q5 is in the off state, at which time the two terminal potentials RELAY- and RELAY+ are both high level, that is, the first coil end (pin 8) and the second coil end (pin 1) of the relay 133 are both high level, and the common end (pin 6) of the relay 133 is connected to the normally closed end (pin 7), so that the bidirectional power transmission module 130 is in the input state to receive the second electric energy provided by the DC power supply device 200 through the bidirectional connection terminal J2. If only the Ethernet power receiving module 110 receives the first power, when the detection unit 151 detects the first power, the control unit 152 controls the switch tube Q5 to turn on. At this time, the terminal potential RELAY- becomes low level, and RELAY+ is still high level, so that the common end (pin 6) of the relay 133 is switched to be connected to the normally open end (pin 5), so that the first power received by the Ethernet power receiving module 110 can be transmitted through the relay 133 and output to the outside through the bidirectional connection terminal J2 for power supply; if only the bidirectional transmission module 130 receives the second power, the switch tube Q5 remains in the default state In the disconnected state, the first connection end and the second connection end of the bidirectional connection terminal J2 are respectively connected to the DC power supply device 200, and the second electric energy can be input through the bidirectional connection terminal J2 and transmitted to the electric energy transmission module 140 through the third overcurrent protection element 134; when the Ethernet power receiving module 110 receives the first electric energy and the bidirectional power transmission module 130 receives the second electric energy, the control unit 152 does not perform the action of controlling the bidirectional power transmission module 130 and the electric energy transmission module 140. At this time, the second electric energy is transmitted to the electric energy transmission module 140 through the third overcurrent protection element 134, which is the same as the default situation.

[0097] The third overcurrent protection element 134 can prevent the current in the conductive path from being too large, thereby damaging the circuit, and the first overcurrent protection element 131 can be a fuse. The first connection end of the bidirectional connection terminal J2 is used to connect to the positive pole of the DC power supply device 200 or the positive pole of an external power device, and the second connection end of the bidirectional connection terminal J2 is used to connect to the negative pole of the DC power supply device 200 or the negative pole of an external power device. In addition, the relay 133 can be a 5-contact relay 133 or an 8-contact relay 133, Figure 11 The relay 133 is only exemplarily shown as an 8-contact relay 133 , in which another set of common terminals (pin 3 ), normally closed terminals (pin 2 ) and normally open terminals (pin 4 ) are suspended.

[0098] In addition, as an optional implementation, the switch tube Q5 can be an N-type field effect tube.

[0099] In one embodiment, Figure 11As shown, the bidirectional power transmission module 130 further includes a fourth overcurrent protection component 135. The first end of the fourth overcurrent protection component 135 is connected to the Ethernet power receiving module 110, and the second end of the fourth overcurrent protection component 135 is connected to the normally open end of the relay 133.

[0100] It can be understood that the fourth overcurrent protection component 135 can prevent the current of the second electric energy output outward through the bidirectional connection terminal J2 from exceeding the current threshold, thereby ensuring power supply safety, where the current threshold can be set artificially.

[0101] In one embodiment, as Figure 11 shown, the bidirectional power transmission module 130 further includes a diode D32, a resistor R33, and a capacitor C32; the first end of the resistor R33 is respectively connected to the second end of the third overcurrent protection component 134, the cathode of the diode D32, and the power transmission module 140, the second end of the resistor R33 is connected to the first end of the capacitor C32, and the second end of the capacitor C32 is connected to the ground terminal; the anode of the diode D32 is connected to the ground terminal.

[0102] It can be understood that the diode D32, the resistor R33, and the capacitor C32 constitute a surge protection circuit, thereby preventing voltage and current spikes and protecting the safety of components. The diode D32 can be a Schottky diode.

[0103] In one embodiment, as Figure 12 shown, the detection unit 151 may include a resistor R61, a resistor R62, a resistor R71, a resistor R72, an optocoupler L1, an optocoupler L2, and an IO sampling unit 151b; the first end of the resistor R61 (denoted as d41 in the figure) is connected to the Ethernet power receiving module 110, the second end of the resistor R61 is connected to the input end of the optocoupler L1, the output end of the optocoupler L1 is connected to the first end of the resistor R62 (denoted as d42 in the figure) and the first input end of the IO sampling unit 151b, and the second end of the resistor R62 is used to receive the second power supply voltage E2; the first end of the resistor R71 is connected to the bidirectional control module, the second end of the resistor R71 is connected to the input end of the optocoupler L2, the output end of the optocoupler L2 is connected to the first end of the resistor R72 and the second input end of the IO sampling unit 151b, the second end of the resistor R72 is used to receive the third power supply voltage E3, and the output end of the IO sampling unit 151b (denoted as d24 in the figure) is connected to the control unit 152.

[0104] In one embodiment, the IO sampling unit 151b can be disposed in the control unit 152.

[0105] Among them, both the optocoupler L1 and the optocoupler L2 can be composed of a light-emitting diode and a photosensitive triode. The anode of the light-emitting diode serves as the input end of the optocoupler, the cathode of the light-emitting diode and the emitter of the photosensitive triode are connected to the ground terminal, and the collector of the photosensitive triode serves as the output end of the optocoupler. The IO sampling unit 151b may include an IO chip to implement signal sampling.

[0106] An embodiment of the present invention further provides a multi-purpose power supply circuit, including an Ethernet power receiving module 110, an Ethernet power supply module 120, a bidirectional power transmission module 130, a power transmission module 140, and a detection and control module 150.

[0107] Among them, the bidirectional power transmission module 130 may include a resistor R21, a resistor R22, a resistor R23, a resistor R24, a resistor R25, a resistor R26, a first overcurrent protection element 131, a second overcurrent protection element 132, a capacitor C21, a switching transistor Q1, a switching transistor Q2, a switching transistor Q3, a switching transistor Q4, a diode D21, and a bidirectional connection terminal J1, as Figure 6 shown; or the bidirectional power transmission module 130 may include a resistor R31, a resistor R32, a switching transistor Q5, a diode D31, a capacitor C31, a relay 133, a third overcurrent protection element 134, a fourth overcurrent protection element 135, a bidirectional connection terminal J2, a diode D32, a resistor R33, and a capacitor C32, as Figure 8 shown.

[0108] The power transmission module 140 may include a power transmission unit 141, a boost unit 142, and a buck unit 143, and its specific connection relationship can refer to Figure 5 the embodiment.

[0109] The detection and control module 150 may include a detection unit 151 and a control unit 152.

[0110] The detection unit 151 includes a resistor R41, a resistor R42, a resistor R43, a resistor R51, a resistor R52, a resistor R53, diodes D41, D42, D51, D52, and an ADC sampling unit 151a. One end of the resistor R41 is connected to the Ethernet power receiving module 110, and the other end of the resistor R41 is respectively connected to one end of the resistor R42, the anode of the diode D41, the cathode of the diode D42, and one end of the resistor R43. The other end of the resistor R42 and the anode of the diode D42 are respectively connected to the ground terminal. The cathode of the diode D41 is used to receive the first protection voltage U1. The other end of the resistor R43 is connected to the first input terminal of the ADC sampling unit 151a. One end of the resistor R51 is connected to the bidirectional control module, and the other end of the resistor R51 is respectively connected to one end of the resistor R52, the anode of the diode D51, the cathode of the diode D52, and one end of the resistor R53. The other end of the resistor R52 and the anode of the diode D52 are respectively connected to the ground terminal. The cathode of the diode D51 is used to receive the second protection voltage U2. The other end of the resistor R53 is connected to the second input terminal of the ADC sampling unit 151a, and the output terminal of the ADC sampling unit 151a is connected to the control unit 152.

[0111] In another embodiment, the detection unit 151 may also include a resistor R61, a resistor R62, resistors R71, R72, optocouplers L1, L2, and an IO sampling unit 151b. One end of the resistor R61 is connected to the Ethernet power receiving module 110, and the other end of the resistor R61 is connected to the input terminal of the optocoupler L1. The output terminal of the optocoupler L1 is connected to one end of the resistor R62 and the first input terminal of the IO sampling unit 151b. The other end of the resistor R62 is used to receive the second power supply voltage E2. One end of the resistor R71 is connected to the bidirectional control module, and the other end of the resistor R71 is connected to the input terminal of the optocoupler L2. The output terminal of the optocoupler L2 is connected to one end of the resistor R72 and the second input terminal of the IO sampling unit 151b. The other end of the resistor R72 is used to receive the third power supply voltage E2, and the output terminal of the IO sampling unit 151b is connected to the control unit 152.

[0112] The embodiment of the present invention also provides an access control system, including access control devices, and the multi-purpose power supply circuit of any one of the above embodiments. The multi-purpose power supply circuit is connected to the access control devices and is used to supply power to the access control devices.

[0113] It can be understood that the access control device may include power-consuming devices such as an access control unit, a terminal controller, a card reader, a face recognition module, and various electric locks. When at least one of the POE power supply device 100 and the DC power supply device 200 exists, the Ethernet power supply module 120 of the multi-power supply circuit can supply Ethernet power to the access control device; when only the POE power supply device 100 exists, the multi-power supply circuit can also output direct current to supply power to DC power-consuming devices.

[0114] For the principle and beneficial effects of the access control system in this embodiment, reference can be made to the principle and beneficial effects of the multi-power supply circuit in the above embodiment, which will not be elaborated here.

[0115] In one embodiment, when the multi-power supply circuit includes the control unit 152, the control unit 152 and the access control unit are the same unit.

[0116] It can be understood that the multi-power supply circuit in this embodiment can supply power to the access control unit, terminal controller, card reader, face recognition module, and various electric locks in the access control device. Among them, the control unit 152 can be replaced by the access control unit in the access control device, thereby reducing the overall volume of the access control system.

[0117] The above are only the preferred embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present application.

Claims

1. A multi-purpose power supply circuit, characterized in that, Including: An Ethernet power receiving module, configured to connect to a POE power supply device and output the first electric energy if the first electric energy provided by the POE power supply device is received; An Ethernet power supply module, connected to the Ethernet power receiving module, configured to receive and output the first electric energy; A bidirectional power transmission module, configured to connect to a DC power supply device and the Ethernet power receiving module, and output the second electric energy if the second electric energy provided by the DC power supply device is received; A power transmission module, connected to the Ethernet power supply module and at least connected to the bidirectional power transmission module, configured to receive the second electric energy; A detection and control module, respectively connected to the Ethernet power receiving module, the bidirectional power transmission module and the power transmission module, and configured to: if only the first electric energy received by the Ethernet power receiving module is detected, control the bidirectional power transmission module to receive and output the first electric energy; if only the second electric energy received by the bidirectional power transmission module is detected, control the power transmission module to transmit the second electric energy to the Ethernet power supply module for the Ethernet power supply module to output the second electric energy.

2. The multi-purpose power supply circuit according to claim 1, wherein The detection and control module includes: A detection unit, respectively connected to the Ethernet power receiving module and the bidirectional power transmission module, configured to detect the first electric energy and the second electric energy; A control unit, respectively connected to the bidirectional power transmission module, the power transmission module and the detection unit, and configured to control the bidirectional power transmission module to receive and output the first electric energy if only the first electric energy is detected; control the power transmission module to transmit the second electric energy to the Ethernet power supply module if only the second electric energy is detected.

3. The multi-purpose power supply circuit according to claim 2, wherein The power transmission module includes: A power transmission unit, connected to the bidirectional power transmission module, configured to receive the second electric energy; A boosting unit, respectively connected to the power transmission unit, the Ethernet power supply module and the control unit; The control unit is further configured to control the boosting unit to perform boosting processing on the second electric energy and transmit it to the Ethernet power supply module.

4. The multi-purpose power supply circuit according to claim 3, wherein The power transmission unit is also respectively connected to the Ethernet power receiving module and the control unit, configured to receive the first electric energy and transmit at least one of the first electric energy and the second electric energy to the control unit to supply power to the control unit.

5. The multi-purpose power supply circuit according to claim 4, characterized in that, The power transmission module further includes: A bucking unit, respectively connected to the power transmission unit and the control unit, configured to perform bucking processing on the first electric energy and the second electric energy and then transmit them to the control unit.

6. The multi-purpose power supply circuit according to claim 5, characterized in that, The power transmission unit includes a diode D11 and a diode D12. The anode of the diode D11 is connected to the bidirectional power transmission module, the anode of the diode D12 is connected to the Ethernet power receiving module, the cathodes of the diode D11 and the diode D12 are commonly connected and respectively connected to the boosting unit and the bucking unit.

7. The multi-purpose power supply circuit according to claim 1, characterized in that, The Ethernet power supply module is provided with a plurality of Ethernet ports to provide multi-terminal output of the first electric energy or the second electric energy.

8. The multi-purpose power supply circuit according to claim 2, wherein The bidirectional power transmission module includes resistor R21, resistor R22, resistor R23, resistor R24, resistor R25, a first overcurrent protection element, switch Q1, switch Q2, switch Q3, switch Q4, diode D21, and a bidirectional connection terminal J1; The first end of resistor R21 is connected to the control unit, and the second end of resistor R21, the first end of resistor R22, and the control end of switch Q1 are commonly connected; the second end of resistor R22, the first connection end of switch Q1 are commonly connected to the ground terminal; the second connection end of switch Q1 is connected to the first end of resistor R23, and the second end of resistor R23 is commonly connected to the control end of switch Q2, the first end of resistor R24, and the control end of switch Q3; the first connection end of switch Q3 is connected to the Ethernet power receiving module, and the second connection end of switch Q3 is commonly connected to the second end of resistor R24 and the first connection end of switch Q2; the second connection end of switch Q2, the first connection end of bidirectional connection terminal J1, and the first end of the first overcurrent protection element are commonly connected; the second connection end of bidirectional connection terminal J1 is connected to the ground terminal; the second end of the first overcurrent protection element, the cathode of diode D21, and the first connection end of switch Q4 are commonly connected, and the control end of switch Q4 is connected to the first end of resistor R25; the second end of resistor R25, the anode of diode D21 are commonly connected to the ground terminal; the second connection end of switch Q4 is connected to the detection unit and the power transmission module respectively.

9. The multi-purpose power supply circuit according to claim 8, characterized in that, The bidirectional power transmission module further includes: A second overcurrent protection element, the first end of the second overcurrent protection element is connected to the second connection end of switch Q2, and the second end of the second overcurrent protection element is connected to the first connection end of bidirectional connection terminal J1 and the first end of the first overcurrent protection element.

10. The multi-purpose power supply circuit according to claim 8, characterized in that, The bidirectional power transmission module further includes resistor R26 and capacitor C21; The first end of resistor R26 is connected to the second end of the first overcurrent protection element, the cathode of diode D21, and the first connection end of switch Q4 respectively, the second end of resistor R26 is connected to the first end of capacitor C21, and the second end of capacitor C21 is connected to the ground terminal.

11. The multi-purpose power supply circuit according to claim 2, characterized in that, The bidirectional power transmission module includes resistor R31, resistor R32, switch Q5, diode D31, capacitor C31, a relay, a third overcurrent protection element, and a bidirectional connection terminal J2; The first end of the resistor R31 is connected to the control unit, the second end of the resistor R31 and the first end of the resistor R32 are commonly connected and connected to the control end of the switching transistor Q5; the first connection end of the switching transistor Q5 and the second end of the resistor R32 are commonly connected and connected to the ground terminal; the second connection end of the switching transistor Q5 and the anode of the diode D31 are commonly connected and connected to the first coil terminal of the relay, the cathode of the diode D31, the second coil terminal of the relay and the first end of the capacitor C31 are commonly connected and receive the first power supply voltage; the second end of the capacitor C31 is connected to the ground terminal; the common terminal of the relay is connected to the first connection end of the bidirectional connection terminal J2, the normally closed terminal of the relay is connected to the first end of the third overcurrent protection element, the normally open terminal of the relay is connected to the Ethernet power receiving module; the second connection end of the bidirectional connection terminal J2 is connected to the ground terminal; the second end of the third overcurrent protection element is connected to the power transmission module.

12. The multi-purpose power supply circuit according to claim 11, characterized in that, The bidirectional power transmission module further includes: A fourth overcurrent protection element, the first end of the fourth overcurrent protection element is connected to the Ethernet power receiving module, and the second end of the fourth overcurrent protection element is connected to the normally open terminal of the relay.

13. The multi-power supply circuit according to claim 11, characterized in that The bidirectional power transmission module further includes a diode D32, a resistor R33 and a capacitor C32; The first end of the resistor R33 is respectively connected to the second end of the third overcurrent protection element, the cathode of the diode D32 and the power transmission module, the second end of the resistor R33 is connected to the first end of the capacitor C32, the second end of the capacitor C32 is connected to the ground terminal; the anode of the diode D32 is connected to the ground terminal.

14. An access control system, characterized in that, Including: An access control device; And the multi-purpose power supply circuit according to any one of claims 1 to 13; Wherein the multi-purpose power supply circuit is connected to the access control device for supplying power to the access control device.

15. The access control system according to claim 14, wherein, When the multi-purpose power supply circuit includes a control unit, the control unit and the access control unit of the access control device are the same unit.

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