Switching circuit and power supply system

Abstract

The utility model discloses a switching circuit and a power supply system, and relates to the technical field of power supplies, the switching circuit comprises a first charging circuit, a first battery circuit, a second charging circuit and a second battery circuit; the input end of the first switching circuit is electrically connected with the output end of the first battery circuit, the first output end of the first switching circuit is electrically connected with the input end of the PFC module of the first power supply circuit, and the second output end of the first switching circuit is electrically connected with the input end of the PFC module of the second power supply circuit; the input end of the second switching circuit is electrically connected with the output end of the second battery circuit, the first output end of the second switching circuit is electrically connected with the input end of the PFC module of the first power supply circuit, and the second output end of the second switching circuit is electrically connected with the input end of the PFC module of the second power supply circuit; the utility model aims to improve the reliability of the system and reduce the cost and occupied area of the standby battery of the power supply system.

Description

TECHNICAL FIELD

[0001] The utility model relates to power supply technical field especially relates to a switching circuit and power supply system. BACKGROUND

[0002] The existing UPS power supply circuit includes rectifier, PFC module and inverter in series, first, the AC power of power grid is converted into DC through rectifier, then the DC is corrected through PFC module, and then is converted into AC load available AC power through inverter, thereby providing stable and reliable AC power supply for various application scenarios. The existing UPS power supply circuit also includes a backup battery for supplying power to the load through PFC module and inverter in sequence when the power grid is powered off.

[0003] But when the backup battery is damaged, if the power grid is powered off, the UPS power supply circuit will stop supplying power to the load, when the load is a server, server downtime means business interruption, which will have a serious impact on the operation of the enterprise and customer experience. In order to solve the above problems, the existing solution is to install multiple backup batteries to switch another backup battery when one of them is damaged, but this will lead to the increase of the cost of UPS power supply circuit and the increase of the space occupation area. SUMMARY

[0004] The main purpose of the utility model is to provide a switching circuit and power supply system, which aims to switch the battery to the second power supply system or the first power supply system when the output of the first power supply system or the second power supply system fails, to maximize the utilization of the battery module of the two sets of power supply system by multiplexing the output circuit of the second power supply system or the first power supply system, to improve the system reliability and reduce the cost and occupation area of the backup battery of the power supply system.

[0005] In order to achieve the above purpose, the utility model provides a switching circuit applied to a power supply system, the power supply system includes a first power supply circuit and a second power supply circuit, the first power supply circuit and the second power supply circuit are both in communication connection with a control unit, and the switching circuit includes:

[0006] A first charging circuit and a first battery circuit, the input end of the first charging circuit is electrically connected with the input end of the rectifier circuit of the first power supply circuit, the output end of the first charging circuit is electrically connected with the power access end of the first battery circuit, and the power output end of the first battery circuit is electrically connected with the input end of the first switch circuit;

[0007] a second charging circuit, an input end of the second charging circuit being electrically connected with an input end of a rectifier circuit of the first power supply circuit, an output end of the second charging circuit being electrically connected with a power input end of the second battery circuit, and a power output end of the second battery circuit being electrically connected with an input end of the second switch circuit;

[0008] a controlled end of the first battery circuit and a controlled end of the second battery circuit are electrically connected with a control end of the control unit;

[0009] a first switch circuit, an input end of the first switch circuit being electrically connected with an output end of the first battery circuit, a first output end of the first switch circuit being electrically connected with an input end of a PFC module of the first power supply circuit, a second output end of the first switch circuit being electrically connected with an input end of a PFC module of the second power supply circuit, and a controlled end of the first switch circuit being electrically connected with a control end of the control unit;

[0010] a second switch circuit, an input end of the second switch circuit being electrically connected with an output end of the second battery circuit, a first output end of the second switch circuit being electrically connected with an input end of a PFC module of the first power supply circuit, a second output end of the second switch circuit being electrically connected with an input end of a PFC module of the second power supply circuit, and a controlled end of the second switch circuit being electrically connected with a control end of the control unit.

[0011] In an embodiment, the first battery circuit comprises:

[0012] a first battery module, a first diode and a second diode, an anode of the first diode being electrically connected with an output end of the first charging circuit, a cathode of the first diode being electrically connected with a power input end of the first battery module, an anode of the second diode being electrically connected with an output end of the first battery module and a first end of the first switch circuit respectively, and a cathode of the second diode being electrically connected with an input end of the first switch circuit;

[0013] the second battery circuit comprises:

[0014] a second battery module, a third diode and a fourth diode, an anode of the third diode being electrically connected with an output end of the second charging circuit, a cathode of the third diode being electrically connected with a power input end of the second battery module, an anode of the fourth diode being electrically connected with an output end of the second battery module and a first end of the second switch circuit respectively, and a cathode of the fourth diode being electrically connected with an input end of the second switch circuit.

[0015] In an embodiment, the first switch circuit comprises:

[0016] A first switch assembly and a second switch assembly, wherein the first end of the first switch assembly and the first end of the second switch assembly are both electrically connected to the output end of the first battery circuit, the second end of the first switch assembly is electrically connected to the input end of the PFC module of the first power supply circuit, the second end of the second switch assembly is electrically connected to the input end of the PFC module of the second power supply circuit, and the controlled end of the first switch assembly and the controlled end of the second switch assembly are both electrically connected to the control end of the control unit.

[0017] The second switching circuit includes:

[0018] The third and fourth switch assemblies are respectively connected to the output terminal of the second battery circuit, the second terminal of the third switch assembly is electrically connected to the input terminal of the PFC module of the first power supply circuit, the second terminal of the fourth switch assembly is electrically connected to the input terminal of the PFC module of the second power supply circuit, and the controlled terminals of the third and fourth switch assemblies are respectively electrically connected to the control terminal of the control unit.

[0019] In one embodiment, the first switching circuit further includes:

[0020] The first fuse and the second fuse are electrically connected to the output terminal of the first battery circuit, the second terminal of the first fuse is electrically connected to the first terminal of the third switch assembly, and the second terminal of the second fuse is electrically connected to the first terminal of the fourth switch assembly.

[0021] The second switching circuit also includes:

[0022] The third and fourth fuse devices are respectively connected to the output terminal of the second battery circuit. The second terminal of the third fuse device is connected to the first terminal of the third switch assembly, and the second terminal of the fourth fuse device is connected to the first terminal of the fourth switch assembly.

[0023] In one embodiment, the switching circuit further includes:

[0024] The parallel controller has its signal receiving end electrically connected to the control end of the control unit, and its control end is electrically connected to the controlled end of the first switching circuit and the controlled end of the second switching circuit, respectively.

[0025] This utility model also proposes a power supply system, including a first power supply circuit, a second power supply circuit, and a switching circuit as described in any one of the above; both the first power supply circuit and the second power supply circuit are electrically connected to the switching circuit.

[0026] In one embodiment, the first power supply circuit further includes:

[0027] The fifth switch assembly has a first terminal connected to the first mains power supply, a second terminal connected to the load, and a controlled terminal electrically connected to the control terminal of the control unit.

[0028] The second power supply circuit also includes:

[0029] The sixth switch assembly has a first terminal connected to a second mains power supply, a second terminal connected to a load, and a controlled terminal electrically connected to the control terminal of the control unit.

[0030] In one embodiment, both the fifth and sixth switching components are static changeover switches.

[0031] In one embodiment, the first power supply circuit further includes:

[0032] The first single-pole double-throw switch has its first terminal connected to the first mains power supply, its second terminal connected to the second mains power supply, its third terminal electrically connected to the input terminal of the rectifier circuit of the first power supply circuit, and its controlled terminal electrically connected to the control terminal of the control unit.

[0033] The second power supply circuit also includes:

[0034] The second single-pole double-throw switch has its first terminal connected to the first mains power supply, its second terminal connected to the second mains power supply, its third terminal electrically connected to the input terminal of the rectifier circuit of the second power supply circuit, and its controlled terminal electrically connected to the control terminal of the control unit.

[0035] The technical solution of this utility model includes a first charging circuit, a first battery circuit, a second charging circuit, a second battery circuit, a first switching circuit, and a second switching circuit. The control unit is used to control the second switching circuit to conduct when the mains power supply to the first power circuit fails and the first battery circuit malfunctions, so that the second battery circuit supplies power to the load sequentially through the second switching circuit and the first power circuit. Similarly, the control unit is also used to control the first switching circuit to conduct when the mains power supply to the second power circuit fails and the second battery circuit malfunctions, so that the first battery circuit charges the load sequentially through the first switching circuit and the second power circuit. With this configuration, in practical applications, the first battery circuit and the second battery circuit can serve as backup batteries for the first and second power circuits, respectively. Compared to existing power systems, the power system using this utility model's switching circuit does not need to configure multiple backup batteries for each power circuit. When the backup battery of one power circuit in the power system fails, if the backup battery equipped in the power circuit also fails, this utility model's switching circuit can switch to the backup battery of another power circuit in the power system to provide power, thereby reducing the cost and space occupied by the power system. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of a module according to an embodiment of the present invention;

[0038] Figure 2 This is a schematic diagram of the circuit structure of an embodiment of the present invention;

[0039] Figure 3 This is a schematic diagram of the circuit structure of another embodiment of the present utility model;

[0040] Figure 4 This is a schematic diagram of the circuit structure of another embodiment of the present invention.

[0041] Explanation of icon numbers:

[0042] 11. First charging circuit; 12. First battery circuit; 21. Second charging circuit; 22. Second battery circuit; 30. First switching circuit; 40. Second switching circuit; 50. Parallel controller; 60. Fifth switching assembly; 70. Sixth switching assembly.

[0043] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0044] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0045] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0046] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0047] Existing UPS power supply circuits consist of a rectifier, a PFC module, and an inverter connected in series. First, the AC power from the grid is converted to DC power by the rectifier. Then, the DC power undergoes power correction by the PFC module, and finally, the inverter converts it into AC power usable by the AC load, thus providing a stable and reliable AC power supply for various application scenarios. Existing UPS power supply circuits also include a backup battery, used to supply power to the load via the PFC module and inverter in the event of a grid power outage.

[0048] However, when the backup battery fails, the UPS power supply circuit will stop supplying power to the load if the power grid fails. When the load is a server, the server shutdown means business interruption, which will have a serious impact on the company's operations and customer experience. To solve the above problems, the existing solution is to install multiple backup batteries to switch to another backup battery when one of the backup batteries fails. However, this will lead to an increase in the cost of the UPS power supply circuit and an increase in the space occupied.

[0049] Therefore, this utility model proposes a switching circuit and power supply system, which aims to switch the battery to the second power supply system or the first power supply system when the output of the first power supply system or the second power supply system fails. By reusing the output circuit of the second power supply system or the first power supply system, the battery modules of the two power supply systems are fully utilized to maximize the system reliability and reduce the cost and area occupied by the backup battery of the power supply system.

[0050] refer to Figure 1 In one embodiment of this utility model, a switching circuit is applied to a power supply system, the power supply system including a first power supply circuit and a second power supply circuit, both the first power supply circuit and the second power supply circuit establishing a communication connection with a control unit, the switching circuit including:

[0051] The first charging circuit 11 and the first battery circuit 12 are connected. The input terminal of the first charging circuit 11 is electrically connected to the input terminal of the rectifier circuit of the first power supply circuit. The output terminal of the first charging circuit 11 is electrically connected to the power input terminal of the first battery circuit 12. The power output terminal of the first battery circuit 12 is electrically connected to the input terminal of the first switch circuit 30.

[0052] The second charging circuit 21 and the second battery circuit 22 are connected. The input terminal of the second charging circuit 21 is electrically connected to the input terminal of the rectifier circuit of the first power supply circuit. The output terminal of the second charging circuit 21 is electrically connected to the power input terminal of the second battery circuit 22. The power output terminal of the second battery circuit 22 is electrically connected to the input terminal of the second switch circuit 40.

[0053] The controlled terminals of the first battery circuit 12 and the second battery circuit 22 are both electrically connected to the control terminal of the control unit.

[0054] The first switching circuit 30 has its input terminal electrically connected to the output terminal of the first battery circuit 12, its first output terminal electrically connected to the input terminal of the PFC module of the first power supply circuit, its second output terminal electrically connected to the input terminal of the PFC module of the second power supply circuit, and its controlled terminal electrically connected to the control terminal of the control unit.

[0055] The second switch circuit 40 has its input terminal electrically connected to the output terminal of the second battery circuit 22, its first output terminal electrically connected to the input terminal of the PFC module of the first power supply circuit, its second output terminal electrically connected to the input terminal of the PFC module of the second power supply circuit, and its controlled terminal electrically connected to the control terminal of the control unit.

[0056] In this embodiment, the first battery circuit 12 and the second battery circuit 22 are used to receive power from the mains when the battery is low, so as to provide power to the first power supply circuit / second power supply circuit when the mains power fails.

[0057] In this embodiment, the first charging circuit 11 and the second charging circuit 21 are devices or circuits used to convert external power (such as mains power) into voltage and current suitable for charging the first battery circuit 12 and the second battery circuit 22. They typically include a rectifier (to convert AC power to DC power), a filter (to smooth the DC power output), and possibly a voltage regulator (to ensure stable output voltage).

[0058] In this embodiment, the switching circuit further includes a parallel controller 50. It should be noted that the control unit includes a first monitoring system and a second monitoring system. The first monitoring system monitors the operating status of the first power supply circuit, and the second monitoring system monitors the operating status of the second power supply circuit. The first and second monitoring systems are also used to output corresponding status signals based on the operating status of the first and second power supply circuits. The parallel controller 50 is used to control the first switching circuit 30 or the second switching circuit 40 to turn on / off based on the received status signals. It is understood that the parallel controller function can also be performed by the control unit.

[0059] Specifically, the technical solution of this utility model includes a first charging circuit 11, a first battery circuit 12, a second charging circuit 12, a second battery circuit 22, a first switch circuit 30, and a second switch circuit 40. The control unit is used to control the second switch circuit 40 to conduct when the mains power connected to the first power circuit fails and the first battery circuit 12 malfunctions, so that the second battery circuit 22 supplies power to the load in sequence through the second switch circuit 40 and the first power circuit. Similarly, the control unit is also used to control the first switch circuit 30 to conduct when the mains power connected to the second power circuit fails and the second battery circuit 22 malfunctions, so that the first battery circuit 12 charges the load in sequence through the first switch circuit 30 and the second power circuit. With this configuration, in practical applications, the first battery circuit 12 and the second battery circuit 22 can serve as backup batteries for the first power circuit and the second power circuit, respectively. Compared with existing power systems, the power system using the switching circuit of this utility model does not need to be equipped with multiple backup batteries for each power circuit. When the backup battery of one of the power circuits of the power system fails, if the backup battery equipped in the power circuit fails, the switching circuit of this utility model can switch the backup battery of the other power circuit of the power system to provide power, thereby reducing the cost of the power system and reducing the space occupied by the power system.

[0060] It should be noted that when both the first and second power supply circuits simultaneously supply power to the load to improve power supply efficiency, if the inverter circuit of either power supply circuit fails, the corresponding power supply circuit cannot supply power to the load. In this case, only a single power supply circuit supplies power to the load, but the power supply efficiency of a single power supply circuit may not meet the power supply requirements of the entire load. To address this, the control unit is also used to control the first switching circuit 30 to open the path between the first battery circuit 12 and the second power supply circuit when the inverter circuit of the first power supply circuit fails, and to control the first battery circuit 12 to operate, so that the second power supply circuit can simultaneously receive power from the mains and the power provided by the first battery circuit 12. The control unit is also used to control the second switching circuit 40 to open the path between the second battery circuit 22 and the first power supply circuit when the inverter circuit of the second power supply circuit fails, and to control the second battery circuit 22 to operate, so that the second power supply circuit can simultaneously receive power from the mains and the power provided by the first battery circuit 12, thereby improving the power supply efficiency of a single power supply circuit and meeting the power supply requirements of the load.

[0061] It is understandable that the first power supply circuit and the second power supply circuit can also serve as backup power supply circuits for each other. For example, when the first power supply circuit fails and cannot work, the control unit controls the second power supply circuit to work to ensure continuous power supply to the load.

[0062] It is understandable that the second output terminal of the first switching circuit 30 can also be connected to the input terminal of the inverter circuit of the second power supply circuit, and the first output terminal of the first switching circuit 30 can also be connected to the input terminal of the inverter circuit of the first power supply circuit; similarly, the first output terminal of the second switching circuit 40 can also be connected to the input terminal of the inverter circuit of the first power supply circuit, and the second output terminal of the second switching circuit 40 can also be connected to the input terminal of the inverter circuit of the second power supply circuit. When the DC power parameters output by the battery circuit meet the actual requirements, there is no need to process them using a PFC module; they can be directly input to the inverter circuit.

[0063] It should be noted that in existing power systems, the backup battery is directly electrically connected to the inverter circuit. When the inverter circuit of the first power circuit / second power circuit fails, the backup battery will stop working due to its own protection strategy. When the power grid fails, the backup battery cannot provide power to the corresponding power circuit because it is not working. To address this, when the power grid is not interrupted, the control unit controls the first switch circuit 30 to shut off the path between the first power circuit and the first battery circuit 12, and also controls the second switch circuit 40 to shut off the path between the second power circuit and the second battery circuit 22, to prevent a failure in the inverter circuit of the power circuit from affecting the battery circuit. The control unit only controls the first switch circuit 30 / second switch circuit 40 to connect the first battery circuit 12 / second battery circuit 22 and the first / second power circuit when the mains power fails.

[0064] It is understandable that, since the first battery circuit 12 is used to charge the load sequentially through the first switch circuit 40 and the first power supply circuit / second power supply circuit, and the second battery circuit 22 is used to supply power to the load sequentially through the second switch circuit 30 and the second power supply circuit / first power supply circuit, the first battery circuit 12 and the second battery circuit 22 are independent of each other and will not interfere with each other.

[0065] refer to Figure 2 In one embodiment of this utility model, the first battery circuit 12 includes:

[0066] The first battery module, the first diode D1, and the second diode D2 are described. The anode of the first diode D1 is electrically connected to the output terminal of the first charging circuit 11, and the cathode of the first diode D1 is electrically connected to the power input terminal of the first battery module. The anode of the second diode D2 is electrically connected to the output terminal of the first battery module and the first terminal of the first switching circuit 30, respectively. The cathode of the second diode D2 is electrically connected to the input terminal of the PFC module of the first power circuit.

[0067] The second battery circuit 22 includes:

[0068] The second battery module, the third diode D3, and the fourth diode D4 are described. The anode of the third diode D3 is electrically connected to the output terminal of the second charging circuit 21, and the cathode of the third diode D3 is electrically connected to the power input terminal of the second battery module. The anode of the fourth diode D4 is electrically connected to the output terminal of the second battery module and the first terminal of the second switching circuit 40, respectively, and the cathode of the fourth diode D4 is electrically connected to the input terminal of the PFC module of the second power supply circuit.

[0069] In this embodiment, the first diode D1 and the third diode D3 are used to prevent the current from the first battery module and the second battery module from flowing back into the first charging circuit 11 and the second charging circuit 21, respectively. The second diode D2 and the fourth diode D4 are used to prevent the DC current after rectification by the rectifier circuit from flowing back into the first battery module and the second battery module, thereby protecting the safety of the charging circuit and the battery module.

[0070] refer to Figure 3 In one embodiment of this utility model, the first switching circuit 30 includes:

[0071] A first switch assembly K1 and a second switch assembly K2, wherein the first end of the first switch assembly K1 and the first end of the second switch assembly K2 are both electrically connected to the output end of the first battery circuit 12, the second end of the first switch assembly K1 is electrically connected to the input end of the PFC module of the first power supply circuit, the second end of the second switch assembly K2 is electrically connected to the input end of the PFC module of the second power supply circuit, and the controlled end of the first switch assembly K1 and the controlled end of the second switch assembly K2 are both electrically connected to the control end of the control unit.

[0072] The second switching circuit 40 includes:

[0073] The third switch assembly K3 and the fourth switch assembly K4 are respectively connected to the output terminal of the second battery circuit 22. The second terminal of the third switch assembly K3 is connected to the input terminal of the PFC module of the first power supply circuit. The second terminal of the fourth switch assembly K4 is connected to the input terminal of the PFC module of the second power supply circuit. The controlled terminals of the third switch assembly K3 and the fourth switch assembly K4 are both connected to the control terminal of the control unit.

[0074] In this embodiment, the first switch assembly K1, the second switch assembly K2, the third switch assembly K3, and the fourth switch assembly K4 can all be any type of bidirectional switch such as a relay or a single-pole single-throw switch.

[0075] In this embodiment, under normal circumstances, the first switch assembly K1 is turned off to prevent the first battery circuit 12 from being affected when the inverter circuit of the first power circuit fails. When the mains power connected to the first power circuit fails, the control unit controls the first switch assembly K1 to turn on so that the first battery circuit 12 can provide power to the first power circuit. When the inverter circuit of the first power circuit fails, the control unit controls the second switch assembly K2 to turn on the path between the first battery circuit 12 and the second power circuit to improve the power supply efficiency of the second power circuit and thus meet the power supply requirements of the load. When the mains power connected to the second power circuit fails and the second battery circuit 22 fails and stops working, the control unit controls the second switch assembly K2 to turn on so that the first battery circuit 12 can provide power to the second power circuit. Similarly, under normal circumstances, the third switch assembly K3 is turned off to prevent the second battery circuit 22 from being affected when the inverter circuit of the second power supply circuit fails. When the mains power connected to the second power supply circuit fails, the control unit controls the third switch assembly K3 to turn on so that the second battery circuit 22 can provide power to the second power supply circuit. When the inverter circuit of the second power supply circuit fails, the control unit controls the fourth switch assembly K4 to turn on the path between the second battery circuit 22 and the first power supply circuit to improve the power supply efficiency of the first power supply circuit and thus meet the power supply requirements of the load. When the mains power connected to the first power supply circuit fails and the first battery circuit 12 fails and stops working, the control unit controls the fourth switch assembly K4 to turn on so that the second battery circuit 22 can provide power to the first power supply circuit.

[0076] Furthermore, in one embodiment of this application, the first switching circuit 30 further includes:

[0077] First fuse F1 and second fuse F2, the first end of the first fuse F1 and the first end of the second fuse F2 are both electrically connected to the output end of the first battery circuit 12, the second end of the first fuse F1 is electrically connected to the first end of the third switch assembly K3, and the second end of the second fuse F2 is electrically connected to the first end of the fourth switch assembly K4.

[0078] The second switching circuit 40 further includes:

[0079] The third fuse device F3 and the fourth fuse device F4 are electrically connected to the output terminal of the second battery circuit 22, the second terminal of the third fuse device F3 is electrically connected to the first terminal of the third switch assembly K3, and the second terminal of the fourth fuse device F4 is electrically connected to the first terminal of the fourth switch assembly K4.

[0080] In this embodiment, optionally, the fuse can be implemented using a current-limiting fuse. When the current output by the battery circuit is too high and reaches the threshold set by the fuse, the current-limiting fuse will melt, thereby cutting off the path between the battery circuit and the power supply circuit, protecting other components in the power system from the impact and damage of high current. Alternatively, the fuse can be implemented using a temperature fuse. When the operating temperature of the battery circuit is too high, the temperature fuse will melt due to the high temperature. This allows for a rapid disconnection of the path between the battery circuit and the power supply circuit in the event of an overheating fault, preventing further escalation of the fault.

[0081] This utility model also proposes a power supply system, including a first power supply circuit, a second power supply circuit, and a switching circuit as described above; both the first power supply circuit and the second power supply circuit are electrically connected to the switching circuit.

[0082] It is worth noting that since the power supply system of this utility model is based on the switching circuit described above, the embodiments of the power supply system of this utility model include all the technical solutions of all the embodiments of the switching circuit described above, and the technical effects achieved are exactly the same, so they will not be repeated here.

[0083] refer to Figure 4 In one embodiment of this utility model, the first power supply circuit further includes:

[0084] The fifth switch assembly 60 has a first terminal connected to the mains power supply, a second terminal connected to the load, and a controlled terminal connected to the control terminal of the control unit.

[0085] The second power supply circuit also includes:

[0086] The sixth switch assembly 70 has a first terminal connected to mains power, a second terminal connected to a load, and a controlled terminal connected to the control terminal of the control unit.

[0087] In this embodiment, both the fifth switch assembly 60 and the sixth switch assembly 70 are static changeover switches.

[0088] In this embodiment, both the input terminal of the rectifier circuit of the first power supply circuit and the first terminal of the fifth switching component 60 are connected to the mains power. Under normal circumstances, the fifth switching component 60 is turned on, and the mains power directly supplies power to the load through the fifth switching component 60. When the voltage quality of the mains power decreases (such as voltage fluctuations, low voltage, voltage distortion, etc.), the mains power cannot continue to provide a stable and reliable power supply to the load. In response, when the control unit detects a decrease in the voltage quality of the mains power, it controls the fifth switching component 60 to turn off and controls the first power supply circuit to operate. The mains power is then processed sequentially by the rectifier circuit, PFC module, and inverter circuit of the first power supply circuit, and can be converted into stable and reliable AC power to meet the power supply requirements of the load. It should be noted that the sixth switching component 70 has the same function as the fifth switching component 60, and will not be described in detail here. With this configuration, the power supply system of this utility model has voltage quality monitoring and protection functions, which can promptly detect and respond to voltage quality problems and prevent damage to the load.

[0089] refer to Figure 4 In one embodiment of this utility model, the first power supply circuit further includes:

[0090] The first single-pole double-throw switch Q1 has its first terminal connected to the first mains power supply, its second terminal connected to the second mains power supply, its third terminal electrically connected to the input terminal of the rectifier circuit of the first power supply circuit, and its controlled terminal electrically connected to the control terminal of the control unit.

[0091] The second power supply circuit also includes:

[0092] The second single-pole double-throw switch Q2 has its first terminal connected to the first mains power supply, its second terminal connected to the second mains power supply, its third terminal electrically connected to the input terminal of the rectifier circuit of the second power supply circuit, and its controlled terminal electrically connected to the control terminal of the control unit.

[0093] In this embodiment, the first power supply circuit and the second power supply circuit are connected to the first mains power and the second mains power by default, respectively. When the control unit detects a power outage in the first mains power, it controls the first single-pole double-throw switch Q1 to open the path between the second mains power and the first power supply circuit; when the control unit detects a power outage in the second mains power, it controls the second single-pole double-throw switch Q2 to open the path between the first mains power and the second power supply circuit. With this configuration, in practical applications, in the event of a power outage in either the first or second mains power, the power system can quickly switch to the second or first mains power, ensuring continuous power supply to the load and enhancing the emergency response capability of the power system of this utility model.

[0094] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A switching circuit applied to a power supply system, the power supply system comprising a first power supply circuit and a second power supply circuit, both the first power supply circuit and the second power supply circuit establishing a communication connection with a control unit, characterized in that, The switching circuit includes: A first charging circuit and a first battery circuit, wherein the input terminal of the first charging circuit is electrically connected to the input terminal of the rectifier circuit of the first power supply circuit, and the output terminal of the first charging circuit is electrically connected to the power input terminal of the first battery circuit. The second charging circuit and the second battery circuit have their input terminals electrically connected to the input terminals of the rectifier circuit of the first power supply circuit, and their output terminals electrically connected to the power input terminals of the second battery circuit. Both the controlled terminal of the first battery circuit and the controlled terminal of the second battery circuit are electrically connected to the control terminal of the control unit. A first switching circuit, wherein the input terminal of the first switching circuit is electrically connected to the power output terminal of the first battery circuit, the first output terminal of the first switching circuit is electrically connected to the input terminal of the PFC module of the first power circuit, the second output terminal of the first switching circuit is electrically connected to the input terminal of the PFC module of the second power circuit, and the controlled terminal of the first switching circuit is electrically connected to the control terminal of the control unit. The second switching circuit has its input terminal electrically connected to the power output terminal of the second battery circuit, its first output terminal electrically connected to the input terminal of the PFC module of the first power circuit, its second output terminal electrically connected to the input terminal of the PFC module of the second power circuit, and its controlled terminal electrically connected to the control terminal of the control unit.

2. The switching circuit as described in claim 1, characterized in that, The first battery circuit includes: A first battery module, a first diode, and a second diode. The anode of the first diode is electrically connected to the output terminal of the first charging circuit, and the cathode of the first diode is electrically connected to the power input terminal of the first battery module. The anode of the second diode is electrically connected to the output terminal of the first battery module and the first terminal of the first switching circuit, respectively, and the cathode of the second diode is electrically connected to the input terminal of the first switching circuit. The second battery circuit includes: The second battery module, the third diode, and the fourth diode are described. The anode of the third diode is electrically connected to the output terminal of the second charging circuit, and the cathode of the third diode is electrically connected to the power input terminal of the second battery module. The anode of the fourth diode is electrically connected to the output terminal of the second battery module and the first terminal of the second switching circuit, respectively, and the cathode of the fourth diode is electrically connected to the input terminal of the second switching circuit.

3. The switching circuit as described in claim 1, characterized in that, The first switching circuit includes: A first switch assembly and a second switch assembly, wherein the first end of the first switch assembly and the first end of the second switch assembly are both electrically connected to the output end of the first battery circuit, the second end of the first switch assembly is electrically connected to the input end of the PFC module of the first power supply circuit, the second end of the second switch assembly is electrically connected to the input end of the PFC module of the second power supply circuit, and the controlled end of the first switch assembly and the controlled end of the second switch assembly are both electrically connected to the control end of the control unit. The second switching circuit includes: The third and fourth switch assemblies are respectively connected to the output terminal of the second battery circuit, the second terminal of the third switch assembly is electrically connected to the input terminal of the PFC module of the first power supply circuit, the second terminal of the fourth switch assembly is electrically connected to the input terminal of the PFC module of the second power supply circuit, and the controlled terminals of the third and fourth switch assemblies are respectively electrically connected to the control terminal of the control unit.

4. The switching circuit as described in claim 3, characterized in that, The first switching circuit also includes: The first fuse and the second fuse are electrically connected to the output terminal of the first battery circuit, the second terminal of the first fuse is electrically connected to the first terminal of the third switch assembly, and the second terminal of the second fuse is electrically connected to the first terminal of the fourth switch assembly. The second switching circuit also includes: The third and fourth fuse devices are respectively connected to the output terminal of the second battery circuit. The second terminal of the third fuse device is connected to the first terminal of the third switch assembly, and the second terminal of the fourth fuse device is connected to the first terminal of the fourth switch assembly.

5. The switching circuit as described in any one of claims 1 to 4, characterized in that, The switching circuit further includes: The parallel controller has its signal receiving end electrically connected to the control end of the control unit, and its control end is electrically connected to the controlled end of the first switching circuit and the controlled end of the second switching circuit, respectively.

6. A power supply system, characterized in that, It includes a first power supply circuit, a second power supply circuit, and a switching circuit as described in any one of claims 1 to 5; both the first power supply circuit and the second power supply circuit are electrically connected to the switching circuit.

7. The power supply system as described in claim 6, characterized in that, The first power supply circuit also includes: The fifth switch assembly has a first terminal connected to the first mains power supply, a second terminal connected to the load, and a controlled terminal electrically connected to the control terminal of the control unit. The second power supply circuit also includes: The sixth switch assembly has a first terminal connected to a second mains power supply, a second terminal connected to a load, and a controlled terminal electrically connected to the control terminal of the control unit.

8. The power supply system as described in claim 7, characterized in that, Both the fifth and sixth switching components are static changeover switches.

9. The power supply system as described in claim 6, characterized in that, The first power supply circuit also includes: The first single-pole double-throw switch has its first terminal connected to the first mains power supply, its second terminal connected to the second mains power supply, its third terminal electrically connected to the input terminal of the rectifier circuit of the first power supply circuit, and its controlled terminal electrically connected to the control terminal of the control unit. The second power supply circuit also includes: The second single-pole double-throw switch has its first terminal connected to the first mains power supply, its second terminal connected to the second mains power supply, its third terminal electrically connected to the input terminal of the rectifier circuit of the second power supply circuit, and its controlled terminal electrically connected to the control terminal of the control unit.

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