Direct-current protection device, electric equipment and direct-current power supply system

Abstract

The utility model relates to a direct current protection device, electric equipment and a direct current power supply system. The direct current protection device comprises a shunt, a current transmitter, a direct current contactor and a controller, the input end of the shunt is connected with the power supply main loop, the first output end of the shunt is connected with the input end of the current transmitter, and the output end of the current transmitter is connected with the controller; the second output end of the shunt is connected with the first end of the direct current contactor, the second end of the direct current contactor is connected with each load branch of the electric equipment, and the third end of the direct current contactor is connected with the controller. By adopting the device, the current abnormity detection of the power supply main loop can be realized, and the direct current contactor is timely and effectively controlled to execute the opening operation or the closing operation according to the current condition of the power supply main loop, so that the protection action and the power supply recovery action of the current abnormity are realized. Compared with a traditional direct current protection scheme, normal power supply can be recovered without replacing the protection device after the protection device acts, and the power supply recovery efficiency can be improved.

Description

Technical Field

[0001] This application relates to the technical field of DC power distribution, and particularly to a DC protection device, an electrical equipment, and a DC power supply system. Background Art

[0002] With the rapid development of DC power related technologies, the power supply mode of data centers has gradually changed from AC power supply to DC power supply. Taking DC power supply as an example, for instance, a 10 kV power source can be processed through a distribution transformer (such as 10 kV to 400 V), a low-voltage power distribution cabinet, a high-voltage DC power source, etc., and finally a 380 V DC power source provided for the servers in the data center can be obtained.

[0003] In traditional technologies, in order to ensure the power supply safety of servers, protection devices such as air switches (also known as circuit breakers), fuses, etc. are usually connected in series between the high-voltage DC power source and the main power supply circuit of the servers; when the current in the main power supply circuit exceeds the current threshold of the protection device, the protection device will automatically disconnect, thereby cutting off the power supply connection between the high-voltage DC power source and the servers, so as to achieve overcurrent protection for the servers.

[0004] However, after the protection device in the traditional power supply protection technology automatically disconnects under overcurrent conditions, it is necessary to replace the protection device again to restore normal power supply, otherwise normal power supply cannot be restored. Summary of the Utility Model

[0005] Based on this, in view of the above technical problems, it is necessary to provide a DC protection device, an electrical equipment, and a DC power supply system that can achieve overcurrent protection for servers and can automatically restore normal power supply after protection.

[0006] In a first aspect, this application provides a DC protection device, including: a shunt, a current transmitter, a DC contactor, and a controller; the input end of the shunt is connected to the main power supply circuit, the first output end of the shunt is connected to the input end of the current transmitter, and the output end of the current transmitter is connected to the controller; the second output end of the shunt is connected to the first end of the DC contactor, the second end of the DC contactor is connected to each load branch of the electrical equipment, and the third end of the DC contactor is connected to the controller;

[0007] The shunt is used to collect the initial current information of the main power supply circuit and transmit the initial current information to the current transmitter;

[0008] The current transmitter is used to determine the first current information based on the initial current information and then transmit the first current information to the controller;

[0009] A controller for controlling a DC contactor to perform a target operation according to first current information and a preset overcurrent protection strategy; the target operation includes opening or closing, and the overcurrent protection strategy includes at least a reverse current protection strategy.

[0010] In one embodiment, a shunt, specifically configured to convert initial current information into first voltage information according to a first conversion rate and transmit the first voltage information to a current transmitter;

[0011] The current transmitter is specifically configured to convert the first voltage information into first current information according to a second conversion rate and transmit the first current information to the controller.

[0012] In one embodiment, the controller is specifically configured to convert the first current information according to the first conversion rate and the second conversion rate to recover the initial current information, and control the DC contactor to perform the target operation based on the initial current information and the overcurrent protection strategy.

[0013] In one embodiment, the overcurrent protection strategy includes a current threshold condition;

[0014] The controller is specifically configured to determine whether the initial current information meets the current threshold condition, and if it meets the current threshold condition, control the DC contactor to perform an opening operation.

[0015] In one embodiment, the initial current information includes an initial current value and a current direction corresponding to the initial current value, and the current threshold condition includes a first current threshold;

[0016] The controller is further configured to control the DC contactor to perform an opening operation when the current direction is reverse and the initial current value is greater than the first current threshold; reverse is the direction in which the current flows into the power supply main circuit.

[0017] In one embodiment, the initial current information includes an initial current value, and the current threshold condition includes a second current threshold and a change rate threshold;

[0018] The controller is further configured to control the DC contactor to perform an opening operation when the initial current value is greater than the second current threshold and the current change rate corresponding to the initial current value is greater than the change rate threshold.

[0019] In one embodiment, the initial current information includes an initial current value, and the current threshold condition includes a third current threshold;

[0020] The controller is further configured to control the DC contactor to perform an opening operation when the initial current value is greater than the third current threshold.

[0021] In one embodiment, the device further includes: a voltage transmitter; an input end of the voltage transmitter is connected to a second output end of the shunt, and an output end of the voltage transmitter is connected to the controller;

[0022] The shunt is further configured to collect initial voltage information of the main power supply circuit and transmit the initial voltage information to the voltage transmitter;

[0023] The voltage transmitter is configured to determine second current information based on the initial voltage information and then transmit the second current information to the controller;

[0024] The controller is further configured to control the DC contactor to perform a target operation according to the second current information and a preset overvoltage protection strategy; the target operation includes opening or closing.

[0025] In one embodiment, the voltage transmitter is specifically configured to convert the initial voltage information into second current information according to a third conversion rate and transmit the second current information to the controller;

[0026] The controller is further configured to convert the second current information according to the third conversion rate, recover the initial voltage information, and control the DC contactor to perform a target operation based on the initial voltage information and the overvoltage protection strategy.

[0027] In one embodiment, the overcurrent protection strategy includes a current threshold condition, and the overvoltage protection strategy includes a voltage threshold condition;

[0028] The controller is further configured to control the DC contactor to perform a closing operation when the first current information does not meet the current threshold condition and the second current information does not meet the voltage threshold condition.

[0029] In a second aspect, the present application further provides an electrical equipment, including: a main power supply circuit, a DC protection device as in the first aspect, and a load branch, and the main power supply circuit is connected to the load branch through the DC protection device;

[0030] The main power supply circuit is configured to supply power to the load branch when the DC contactor of the DC protection device is in a closed state.

[0031] In a third aspect, the present application further provides a DC power supply system, including a power supply device and the electrical equipment as in the second aspect; the power supply device is connected to the main power supply circuit of the electrical equipment;

[0032] The power supply device is configured to supply power to the load branch of the electrical equipment through the main power supply circuit when the DC contactor of the DC protection device in the electrical equipment is in a closed state.

[0033] The above-mentioned DC protection device, electrical equipment, and DC power supply system. The DC protection device includes a shunt, a current transmitter, a DC contactor, and a controller. Among them, the input end of the shunt is connected to the main power supply circuit, the first output end of the shunt is connected to the input end of the current transmitter, and the output end of the current transmitter is connected to the controller. The second output end of the shunt is connected to the first end of the DC contactor, the second end of the DC contactor is connected to each load branch of the electrical equipment, and the third end of the DC contactor is connected to the controller. The shunt is used to collect the initial current information of the main power supply circuit and transmit the initial current information to the current transmitter. The current transmitter is used to determine the first current information based on the initial current information and then transmit the first current information to the controller. The controller is used to control the DC contactor to perform a target operation according to the first current information and a preset overcurrent protection strategy. The target operation includes opening or closing, and the overcurrent protection strategy at least includes a reverse current protection strategy. That is to say, the DC protection device proposed in this application realizes DC power supply protection through a controller and a controllable switch, collects the current information of the main power supply circuit through a shunt and a current transmitter, and converts the collected current information of the main power supply circuit into current information that the controller can accept, so that the controller can perform abnormal detection on the current of the main power supply circuit based on the received current information, and can timely control the DC contactor to open to cut off the power supply circuit when it is determined that a current abnormality occurs. At the same time, when it is determined that the current returns to normal, it can also timely control the DC contactor to close to restore normal power supply. By using this DC protection device, there is no need to replace the protection device after it is disconnected to restore normal power supply, which can not only improve the efficiency of power supply restoration, but also reduce the manpower consumption and waste of the protection device caused by replacing the protection device, reduce manpower, material resources and financial resources, and improve the reliability and intelligence of power supply. In addition, using a controller to achieve current protection can also achieve precise operation of DC power supply protection, quickly isolate faults, and improve the timeliness and efficiency of protection actions. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments or related technologies. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0035] Figure 1 It is a schematic structural diagram of the DC protection device provided by the embodiment of the present application;

[0036] Figure 2 It is another schematic structural diagram of the DC protection device provided by the embodiment of the present application;

[0037] Figure 3 Structural schematic diagram of the electrical equipment provided by the embodiment of the present application;

[0038] Figure 4 Another structural schematic diagram of the electrical equipment provided by the embodiment of the present application;

[0039] Figure 5 Structural schematic diagram of the DC power supply system provided by the embodiment of the present application.

[0040] Explanation of reference numerals:

[0041] 100: DC protection device; 101: shunt; 102: current transmitter; 103: DC contactor;

[0042] 104: controller; 105: voltage transmitter; 200: electrical equipment; 201: main power supply circuit;

[0043] 202: load branch; 203: fast fuse; 300: DC power supply system; 301: power supply device. Detailed implementation manners

[0044] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. 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.

[0045] The DC protection device provided by the embodiment of the present application is applicable to the technical field of DC power supply protection, such as overcurrent and / or overvoltage protection for the main power supply circuit of DC power supply to servers in the data center, so as to ensure the power supply reliability and power supply safety of the DC power supply to the servers.

[0046] With the rapid development of industry technologies such as cloud computing, Internet of Things, big data and artificial intelligence, the demand for timely and efficient processing of massive data is constantly increasing. As the most basic infrastructure for data processing and processing, the data center can realize the efficient processing of massive data; therefore, the power supply reliability of the data center is related to the data processing security of the entire data center.

[0047] For a data center, the traditional power supply method is AC power supply, and uninterruptible power supply (UPS) is used to achieve uninterrupted power supply. The power supply method is usually that a 10 kV power source passes through a 10 kV / 400 V distribution transformer, a low-voltage distribution cabinet, and a UPS in sequence, and finally provides 380 V AC power for the servers in the data center. Since computer devices (including servers) are usually DC power-consuming devices, a switching power supply is also required to rectify the 380 V AC power and perform DC / DC conversion before it can be used by various components on the server motherboard.

[0048] In recent years, DC-related technologies have developed rapidly in the fields of power (DC power transmission), communication (240 V, 336 V high-voltage DC power supply), electric vehicles (DC charging), etc. With the development of power electronics technology and the increasing proportion of DC devices in end-use equipment, the technical advantages of DC power supply and distribution have gradually emerged. The power supply method of data centers has gradually changed from AC power supply to DC power supply.

[0049] For a data center adopting high-voltage DC power supply, the power supply method can be that a 10 kV power source passes through a 10 kV / 400 V distribution transformer, a low-voltage distribution cabinet, and the processing of a high-voltage DC power source in sequence, and finally provides 380 V DC power for the servers; the output of the high-voltage DC power source, that is, the DC bus, can be directly connected to the battery of the server to achieve uninterrupted power supply similar to that of an AC UPS.

[0050] To ensure the reliability and safety of DC power supply, DC power supply protection is usually carried out. Traditionally, when performing DC power supply protection, a protection device is usually connected in series in the main power supply circuit. This protection device can automatically disconnect when an overcurrent occurs in the main power supply circuit, thereby disconnecting the power supply connection between external devices (such as high-voltage DC power sources) and the server to protect the server from the impact of overcurrent. Among them, the main power supply circuit is the connection circuit between external devices and the server, and external devices provide the required DC power for the server through this main power supply circuit.

[0051] However, due to traditional protection devices, they all perform self-disconnection actions based on their own characteristics in the event of overcurrent; after disconnection, the protection device needs to be replaced before normal power supply can be restored, otherwise normal power supply cannot be restored, resulting in continuous disconnection of the server power supply.

[0052] Based on this, in the embodiments of the present application, a DC protection device is proposed, which realizes overcurrent / overvoltage protection for the server through a programmable logic controller and a controllable switch. It can automatically control the controllable switch to disconnect in the case of overcurrent / overvoltage of the server to cut off the main power supply circuit of the server; it can also automatically control the controllable switch to close after the current and voltage return to normal to restore the normal power supply of the server. It can solve the limitation that only by replacing the protection device can the power supply be restored after the traditional protection device is disconnected, and realize full-automatic power supply protection.

[0053] The technical solution of the present application and how the technical solution of the present application solves the above technical problems will be described in detail below with specific embodiments. These specific embodiments below can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below with reference to the accompanying drawings.

[0054] Figure 1 It is a schematic structural diagram of the DC protection device provided by the embodiment of the present application. As Figure 1 shown, the DC protection device 100 includes: a shunt 101, a current transmitter 102, a DC contactor 103, and a controller 104; the input end of the shunt 101 is connected to the main power supply circuit, the first output end of the shunt 101 is connected to the input end of the current transmitter 102, and the output end of the current transmitter 102 is connected to the controller 104; the second output end of the shunt 101 is connected to the first end of the DC contactor 103, the second end of the DC contactor 103 is connected to each load branch of the electrical equipment, and the third end of the DC contactor 103 is connected to the controller 104.

[0055] Among them, the shunt 101 is used to collect the initial current information of the main power supply circuit and transmit the initial current information to the current transmitter 102; the current transmitter 102 is used to determine the first current information according to the initial current information and then transmit the first current information to the controller 104; the controller 104 is used to control the DC contactor 103 to perform a target operation according to the first current information and a preset overcurrent protection strategy; the target operation includes disconnecting or closing, and the overcurrent protection strategy at least includes a reverse current protection strategy.

[0056] Exemplarily, the initial current information of the main power supply circuit may include the actual current value of the main power supply circuit. The shunt 101 can detect and collect the current on the main power supply circuit to obtain the actual current value of the main power supply circuit; then, the shunt 101 can transmit the actual current value of the main power supply circuit to the current transmitter 102 in real time.

[0057] Exemplarily, the initial current information of the main power supply circuit may also include the current signal of the main power supply circuit. The shunt 101 can transmit the collected current signal on the main power supply circuit to the current transmitter 102 in real time.

[0058] Next, when the current transmitter 102 obtains the initial current information of the main power supply circuit, it can perform a first conversion process on the initial current information to obtain the first current information, and transmit the converted first current information to the controller 104. Exemplarily, this first conversion process operation may include reducing the initial current information; in one implementation, the current magnitude that the controller 104 can withstand may be much smaller than the current magnitude of the main power supply circuit. Therefore, when the current transmitter obtains the actual initial current information on the main power supply circuit, it can perform a reduction process on the initial current information to obtain the first current information within the current range that the controller 104 can accept.

[0059] In another implementation, when the shunt 101 collects the initial current information of the main power supply circuit, it can also perform a pre-conversion process on the initial current information first, and transmit the information after the pre-conversion process to the current transmitter 102; furthermore, the current transmitter 102 can perform a first conversion process on the information after the pre-conversion process to obtain the above-mentioned first current information. Exemplarily, when the shunt 101 performs a pre-conversion process on the initial current information, the information obtained after the pre-conversion process can be intermediate voltage information or intermediate current information; that is to say, the shunt 101 can convert the initial current information into intermediate voltage information or convert the initial current information into intermediate current information.

[0060] In an optional implementation, the shunt 101 can convert the initial current information into small voltage information in millivolts, and this small voltage information in millivolts is the intermediate voltage information; then, the shunt 101 transmits the small voltage information in millivolts to the current transmitter 102, and the current transmitter 102 can convert the small voltage information in millivolts into small current information in milliamperes, that is, obtain the above-mentioned first current information. Furthermore, the current transmitter 102 can transmit the small current information in milliamperes to the controller 104 so that the controller 104 can perform current anomaly detection on the main power supply circuit based on the small current information in milliamperes.

[0061] Exemplarily, when the first current information is small current information in milliamperes, the controller 104 can directly determine whether a current anomaly event occurs in the main power supply loop based on the small current information in milliamperes and a preset overcurrent protection strategy; and, when it is determined that a current anomaly event occurs in the main power supply loop, the controller 104 can control the DC contactor 103 to perform a disconnection operation to cut off the power supply connection between the external power supply and each load branch of the electrical equipment, thereby realizing current anomaly protection. Conversely, when it is determined that no current anomaly event occurs in the main power supply loop, the controller 104 can control the DC contactor 103 to perform a closing operation to keep the DC contactor 103 in a closed state, which is conducive to the external power supply providing power support to each load branch of the electrical equipment.

[0062] It should be noted that the DC circuit breaker 103 can be a type of controllable switch. In other implementation solutions, other types of controllable switches other than the DC circuit breaker 103 can also be selected. The embodiments of the present application do not specifically limit the type of the controllable switch in the DC protection device.

[0063] Exemplarily, the preset overcurrent protection strategy in the controller 104 can include a reverse current protection strategy, and the reverse current protection strategy is used to implement a protection action when a reverse current appears and the reverse current is relatively high; wherein, the reverse current can be the current flowing from the load branch of the electrical equipment to the external power supply. Exemplarily, the initial current information collected by the shunt 101 can also include current direction information. Then, correspondingly, the first current information after the current transducer 102 converts the initial current information can also include current direction information, so that the controller 104 can judge reverse current protection based on the current direction information and current magnitude (such as current value) in the first current information, and control the DC contactor 103 to perform a disconnection operation when it is determined that a reverse current protection event occurs.

[0064] The above-mentioned DC protection device includes a shunt, a current transmitter, a DC contactor, and a controller. Among them, the input end of the shunt is connected to the main power supply circuit, the first output end of the shunt is connected to the input end of the current transmitter, and the output end of the current transmitter is connected to the controller. The second output end of the shunt is connected to the first end of the DC contactor, the second end of the DC contactor is connected to each load branch of the electrical equipment, and the third end of the DC contactor is connected to the controller. The shunt is used to collect the initial current information of the main power supply circuit and transmit the initial current information to the current transmitter. The current transmitter is used to determine the first current information based on the initial current information and then transmit the first current information to the controller. The controller is used to control the DC contactor to perform a target operation according to the first current information and a preset overcurrent protection strategy. The target operation includes opening or closing, and the overcurrent protection strategy at least includes a reverse current protection strategy. That is to say, the DC protection device proposed in this application realizes DC power supply protection through a controller and a controllable switch, collects the current information of the main power supply circuit through a shunt and a current transmitter, and converts the collected current information of the main power supply circuit into current information that the controller can accept, so that the controller can detect abnormalities in the current of the main power supply circuit based on the received current information, and can timely control the DC contactor to open to cut off the power supply circuit when it is determined that a current abnormality occurs. At the same time, when it is determined that the current returns to normal, it can also timely control the DC contactor to close to restore normal power supply. By using this DC protection device, there is no need to replace the protection device after it is disconnected to restore normal power supply, which can not only improve the efficiency of power supply restoration, but also reduce the manpower consumption and waste of protection devices caused by replacing protection devices, reduce manpower, material resources and financial resources, and improve the reliability and intelligence of power supply. In addition, using a controller to implement current protection can also achieve precise operation of DC power supply protection, quickly isolate faults, and improve the timeliness and efficiency of protection actions.

[0065] In an exemplary embodiment, the shunt 101 can also convert the initial current information into first voltage information according to a first conversion rate and transmit the first voltage information to the current transmitter 102. At the same time, the current transmitter 102 can convert the first voltage information into first current information according to a second conversion rate and transmit the first current information to the controller 104.

[0066] Exemplarily, the first conversion rate can be a conversion rate with an increasing effect or a conversion rate with a decreasing effect. That is to say, the shunt 101 can convert the initial current information into larger first voltage information or convert the initial current information into smaller first voltage information. For example, the shunt 101 can convert the initial current information with a large range into the first voltage information with a small range and transmit the first voltage information with the small range to the current transmitter 102. Of course, the shunt 101 can also convert the initial current information with a small range into the first voltage information with a large range and transmit the first voltage information with the large range to the current transmitter 102. It should be noted that in the actual application process, the magnitude of the first conversion rate can be adaptively set according to the capabilities of the current transmitter 102.

[0067] Similarly, for the second conversion rate, it can also be a conversion rate with an increasing effect or a conversion rate with a decreasing effect. For example, the current transmitter 102 can convert the first voltage information with a large range into the first current information with a small range or convert the first voltage information with a small range into the first current information with a large range. In the actual use process, the magnitude of the second conversion rate can be adaptively set according to the capabilities of the controller 104.

[0068] Exemplarily, for the methods of voltage-to-current conversion and current-to-voltage conversion, they can be implemented based on the conversion relationships among current, voltage, and resistance. This is not described in detail in this embodiment.

[0069] Exemplarily, on this basis, the controller 104 can also convert the first current information according to the above-mentioned first conversion rate and the second conversion rate, restore the initial current information, and control the DC contactor to perform the target operation based on the initial current information and the overcurrent protection strategy.

[0070] That is to say, the controller 104 can not only directly control the DC contactor based on the first current information and the overcurrent protection strategy to achieve current anomaly protection, but also control the DC contactor based on the initial current information and the overcurrent protection strategy to achieve current anomaly protection. It should be noted that since the magnitudes of the first current information and the initial current information may be different, the magnitude of the current threshold used in the overcurrent protection strategy will also be different. When setting the current threshold, it can be adaptively adjusted according to the actual situation to meet the overcurrent protection of the power supply main circuit.

[0071] In this embodiment, the shunt can convert the initial current information on the main power supply loop into first voltage information at a first conversion rate. At the same time, the current transmitter can convert the first voltage information into first current information at a second conversion rate. This enables the controller to not only directly perform current anomaly protection based on the first current information, but also restore the first current information to the initial current information based on the first conversion rate and the second conversion rate, and perform current anomaly protection based on the initial current information. That is, the DC protection device in this embodiment has a more diverse and comprehensive structure and implementation strategy to adapt to the circuit protection of different electrical equipment and different scenarios.

[0072] In an exemplary embodiment, the above overcurrent protection strategy may include a current threshold condition. The controller is specifically configured to determine whether the initial current information meets the current threshold condition. If the current threshold condition is met, the controller controls the DC contactor to perform a disconnection operation. For the above overcurrent protection strategy, it may not only include a reverse current protection strategy, but also include other types of current anomaly protection strategies, which will be described in detail below.

[0073] In a first alternative implementation, the above overcurrent protection strategy may include a reverse current protection strategy. The current threshold condition may include a first current threshold. When the initial current information includes the initial current value and the current direction of the main power supply loop, the reverse current protection strategy may include a reverse current determination condition, and the reverse current determination condition may be that the current direction of the main power supply loop is reverse and the initial current value of the main power supply loop is greater than or equal to the first current threshold.

[0074] That is to say, the controller is further configured to determine that a reverse current event occurs in the main power supply loop when it is determined that the current direction of the main power supply loop is reverse and the initial current value of the main power supply loop is greater than or equal to the first current threshold. The controller sends a disconnection signal to the DC contactor to control the DC contactor to perform a disconnection operation. Here, the reverse direction is the direction in which the current flows into the main power supply loop, that is, the direction in which the current flows from the load branch of the electrical equipment to the external power supply.

[0075] In a second alternative implementation, the above overcurrent protection strategy may further include a current rising rate protection strategy, which is used to perform a protection action when the current is high and the current change rate is also high. Exemplarily, for the current rising rate protection strategy, the above current threshold condition may include a second current threshold and a change rate threshold, and the second current threshold here may be smaller than the above first current threshold. For the current rising rate protection strategy, it may include a current rising condition, and the current rising condition may be that the initial current value of the main power supply loop is greater than or equal to the second current threshold and the current change rate of the main power supply loop is greater than or equal to the change rate threshold.

[0076] Exemplarily, the controller can also be used to determine that a current rise event has occurred in the main power supply circuit when it is determined that the initial current value of the main power supply circuit is greater than or equal to the second current threshold and the current change rate corresponding to the initial current value of the main power supply circuit is greater than or equal to the change rate threshold, and then send a disconnection signal to the DC contactor to control the DC contactor to perform a disconnection operation.

[0077] Exemplarily, the controller can calculate the current change rate based on the initial current value in the initial current information and determine whether the current change rate is greater than or equal to the change rate threshold; if the current change rate is greater than or equal to the change rate threshold, it further determines whether the initial current value is greater than or equal to the second current threshold; if the initial current value is greater than or equal to the second current threshold, it indicates that a short - circuit fault has occurred in the main power supply circuit, and the current on the main power supply circuit at this time is the short - circuit current. The controller needs to send a disconnection signal to the DC contactor to control the DC contactor to perform a disconnection operation; if the initial current value is less than the second current threshold, it indicates that the current on the main power supply circuit at this time is the load current. In this case, the protection action may not be performed, that is, the controller does not need to send a disconnection signal to the DC contactor, and the DC contactor remains closed.

[0078] In a third alternative implementation, the above over - current protection strategy may further include a current quick - break protection strategy, which is used to implement a protection action when the current is relatively high. Exemplarily, for the current quick - break protection strategy, the above current threshold condition may include a third current threshold; the third current threshold here may be the same as or different from the above first current threshold; of course, the third current threshold may also be the same as or different from the above second current threshold.

[0079] For the current quick - break protection strategy, it may include a current quick - break condition. When the initial current information includes the initial current value of the main power supply circuit, the current quick - break condition may be that the initial current value of the main power supply circuit is greater than or equal to the third current threshold. That is to say, the controller is also used to determine that a current quick - break event has occurred in the main power supply circuit when it judges that the initial current value of the main power supply circuit is greater than or equal to the third current threshold, and then send a disconnection signal to the DC contactor to control the DC contactor to perform a disconnection operation.

[0080] The above content describes three over - current protection strategies, namely the reverse - current protection strategy, the current - rise - rate protection strategy, and the current quick - break protection strategy. Through the three different current protection strategies, it is possible to achieve protection actions for different current abnormal events in the main power supply circuit, thereby improving the power supply safety of the main power supply circuit.

[0081] In an exemplary embodiment, for the above DC protection device 100, refer to Figure 2As shown, the DC protection device 100 may further include a voltage transmitter 105; the input end of the voltage transmitter 105 is connected to the second output end of the shunt 101, and the output end of the voltage transmitter 105 is connected to the controller 104.

[0082] Based on this, the above-mentioned shunt 101 is further configured to collect the initial voltage information of the power supply main circuit and transmit the initial voltage information to the voltage transmitter 105; the voltage transmitter 105 is configured to determine the second current information according to the initial voltage information and then transmit the second current information to the controller 104; the controller 104 is further configured to control the DC contactor 103 to perform a target operation according to the second current information and a preset overvoltage protection strategy; wherein, the target operation includes a disconnection operation or a closing operation.

[0083] Exemplarily, the voltage transmitter 105 may convert the initial voltage information into the second current information according to a third conversion rate and transmit the second current information to the controller 104; the controller 104 may convert the second current information according to the third conversion rate, restore the initial voltage information, and control the DC contactor 103 to perform a target operation based on the initial voltage information and the overvoltage protection strategy.

[0084] For example: the voltage transmitter 105 may convert the initial voltage of the power supply main circuit collected by the shunt 101 into a small current in milliamperes and input the converted small current in milliamperes to the controller 104; then, the controller 104 may perform an amplification process on the received small current based on the scaling ratio of the voltage transmitter 105, that is, the third conversion rate, so as to obtain the real voltage on the power supply main circuit, so as to realize the real-time acquisition of the voltage on the power supply main circuit.

[0085] Exemplarily, the above-mentioned overvoltage protection strategy may include a voltage threshold condition, and the controller 104 may further determine whether the initial voltage information meets the voltage threshold condition. If the voltage threshold condition is met, the controller 104 controls the DC contactor 103 to perform a disconnection operation.

[0086] In an optional implementation manner, the voltage threshold condition may include a preset voltage threshold, and the voltage threshold condition may be whether the initial voltage value of the power supply main circuit is greater than or equal to the voltage threshold. That is to say, when the controller 104 obtains the initial voltage value on the power supply main circuit, it may determine whether the initial voltage value is greater than or equal to the voltage threshold, and when it is determined that the initial voltage value is greater than or equal to the voltage threshold, it is determined that an overvoltage event has occurred in the power supply main circuit. At this time, the controller 104 needs to send a disconnection signal to the DC contactor 103 to control the DC contactor 103 to perform a disconnection operation, so as to cut off the power input provided by the power supply main circuit to each load branch of the electrical equipment, and avoid failures of each load branch of the electrical equipment due to too high input voltage.

[0087] In this embodiment, the DC protection device includes not only a current transmitter but also a voltage transmitter, enabling the DC protection device to not only detect abnormal current but also detect abnormal voltage. Thus, when any abnormality occurs in the power supply main circuit, the DC contactor can be timely and effectively controlled to disconnect, cutting off the power supply connection between the external power supply and the electrical equipment, and preventing damage to the components on the load branch of the electrical equipment due to excessive current or voltage. Additionally, the DC protection device can perform precise protection actions for overcurrent and overvoltage, thereby achieving rapid isolation of faults and ensuring the timeliness and efficiency of fault isolation to the greatest extent.

[0088] In an exemplary embodiment, the above overcurrent protection strategy may include a current threshold condition, and the overvoltage protection strategy may include a voltage threshold condition; the controller 104 may also be configured to control the DC contactor to perform a closing operation when the first current information does not meet the current threshold condition and the second current information does not meet the voltage threshold condition.

[0089] That is to say, in the DC protection device of the embodiment of the present application, since the current transmitter and the voltage transmitter are connected to one end of the DC contactor close to the power supply main circuit, after the DC contactor 103 disconnects, the current transmitter and the voltage transmitter can still collect the voltage information and current information on the power supply main circuit; thus, the voltage detection and current detection of the power supply main circuit can continue to be realized, so that when the controller determines that both the current and voltage of the power supply main circuit return to normal, the controller can automatically control the DC contactor to perform a closing operation to ensure that the power supply main circuit is conducting; thereby enabling the external power supply to continue to provide power input to each load branch of the electrical equipment and restoring normal power supply.

[0090] In an exemplary embodiment, as Figure 3 shown, there is also provided an electrical equipment 200, including: a power supply main circuit 201, the DC protection device 100 in any of the above embodiments, and a load branch 202. The power supply main circuit 201 is connected to the load branch 202 through the DC protection device 100; the power supply main circuit 201 is configured to be power supply-connected to the load branch 202 when the DC contactor 103 of the DC protection device 100 is in a closed state.

[0091] Among them, the load branch 202 in the electrical equipment 200 may include one or more. The power supply main circuit 201 is respectively connected to each load branch 202 through the DC protection device 100 to provide power input to each load branch 202 respectively when the DC contactor 103 of the DC protection device 100 is in a closed state, ensuring that each load branch 202 can operate normally.

[0092] In addition, the main power supply circuit 201 is also used to be in a power supply disconnected state from each load branch 202 when the DC contactor 103 of the DC protection device 100 is in an open state; at this time, each load branch 202 cannot obtain power input from the main power supply circuit 201 and may not be able to work.

[0093] In addition, for the electrical equipment 200, it includes but is not limited to various servers in the data center, as well as other types of computer equipment and the like.

[0094] For the DC protection device, its specific implementation manner can refer to the relevant content descriptions of the DC protection device in the above embodiments, and will not be repeated here.

[0095] In an alternative implementation, as Figure 4 shown, another electrical equipment 200 is provided. This electrical equipment 200 also includes the same number of fast fuses 203 as the load branches 202; that is, for each load branch 202, at least one fast fuse 203 is connected in series between the DC protection device 100 and the load branch 202; that is, for each load branch 202, the main power supply circuit 201 is first connected to the fast fuse 203 through the DC protection device 100, and then connected to the load branch 202 through the fast fuse 203.

[0096] Based on this, the fast fuse 203 can automatically disconnect based on its own characteristics when the current on the corresponding load branch 202 is too high, so as to cut off the power supply connection between the main power supply circuit 201 and the load branch 202; that is, in the case of a failure of the DC protection device 100, the fast fuses 203 connected in series with each load branch 202 can also be used to perform protection actions on each load branch 202, realizing double power supply protection for the electrical equipment. Among them, the failure of the DC protection device 100 includes but is not limited to the failure of the DC contactor 103 in the DC protection device 100, the failure of the controller 104 in the DC protection device 100, etc.

[0097] In addition, for the electrical equipment using the fast fuses 203, since the fast fuses 203 are used as a backup protection method, when a short - circuit fault occurs, the fuses will not blow during the process of controlling the DC contactor to cut off the power supply circuit by the controller in the DC protection device. Therefore, the situation of having to replace the fuse after a short - circuit can be avoided.

[0098] In an exemplary embodiment, as Figure 5As shown in the figure, a DC power supply system 300 is further provided, which includes a power supply device 301 and the above-mentioned electrical equipment 200; the power supply device 301 is connected to the main power supply circuit 201 of the electrical equipment 200; the power supply device 301 is configured to supply power to the load branch 202 of the electrical equipment 200 through the main power supply circuit 201 when the DC contactor 103 of the DC protection device 100 in the electrical equipment 200 is in a closed state.

[0099] Among them, the load branch 202 of the electrical equipment 200 may include one or more. In addition, the power supply device 301 is further configured to prohibit supplying power to each load branch 202 of the electrical equipment 200 through the main power supply circuit 201 when the DC contactor 103 of the DC protection device 100 in the electrical equipment 200 is in an open state.

[0100] In addition, for the power supply device, it includes but is not limited to any type of DC power supply, such as a high-voltage DC power supply, etc.

[0101] For the DC protection device, the specific implementation manner can refer to the relevant content description of the DC protection device in the above-mentioned embodiments, and will not be repeated here.

[0102] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0103] The above-described embodiments merely represent several implementation manners of the present application. Their descriptions are relatively specific and detailed, but should not be construed as a limitation on the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A DC protection device, characterized in that: include: Shunts, current transmitters, DC contactors and controllers; The input end of the shunt is connected to the main power supply circuit, the first output end of the shunt is connected to the input end of the current transmitter, and the output end of the current transmitter is connected to the controller; the second output end of the shunt is connected to the first end of the DC contactor, the second end of the DC contactor is connected to each load branch of the electrical equipment, and the third end of the DC contactor is connected to the controller; The current divider is used to collect initial current information of the main power supply circuit and transmit the initial current information to the current transmitter; The current transmitter is used to determine the first current information according to the initial current information and transmit the first current information to the controller; The controller is used to control the DC contactor to perform a target operation according to the first current information and a preset overcurrent protection strategy; the target operation includes opening or closing, and the overcurrent protection strategy includes at least a reverse current protection strategy.

2. The device according to claim 1, characterized in that The current divider is specifically used to convert the initial current information into first voltage information according to a first conversion rate, and transmit the first voltage information to the current transmitter; The current transmitter is specifically used to convert the first voltage information into the first current information according to a second conversion rate, and transmit the first current information to the controller.

3. The device according to claim 2, characterized in that The controller is specifically configured to convert the first current information according to the first conversion rate and the second conversion rate, restore the initial current information, and control the DC contactor to perform a target operation based on the initial current information and the overcurrent protection strategy.

4. The device according to claim 3, characterized in that The overcurrent protection strategy includes a current threshold condition; The controller is specifically used to determine whether the initial current information meets the current threshold condition, and if the current threshold condition is met, control the DC contactor to perform a disconnection operation.

5. The device according to claim 4, characterized in that The initial current information includes an initial current value and a current direction corresponding to the initial current value, and the current threshold condition includes a first current threshold; The controller is further used to control the DC contactor to perform a disconnection operation when the current direction is reverse and the initial current value is greater than the first current threshold; the reverse direction is the direction in which the current flows into the main power supply circuit.

6. The device according to claim 4, characterized in that The initial current information includes an initial current value, and the current threshold condition includes a second current threshold and a change rate threshold; The controller is further configured to control the DC contactor to perform a disconnection operation when the initial current value is greater than the second current threshold and the current change rate corresponding to the initial current value is greater than the change rate threshold.

7. The device according to claim 4, characterized in that The initial current information includes an initial current value, and the current threshold condition includes a third current threshold; The controller is further configured to control the DC contactor to perform a disconnection operation when the initial current value is greater than the third current threshold.

8. The device according to any one of claims 1 to 7, characterized in that: The device further comprises: a voltage transmitter; an input end of the voltage transmitter is connected to the second output end of the shunt, and an output end of the voltage transmitter is connected to the controller; The shunt is also used to collect initial voltage information of the main power supply circuit and transmit the initial voltage information to the voltage transmitter; The voltage transmitter is used to determine the second current information according to the initial voltage information and transmit the second current information to the controller; The controller is further used to control the DC contactor to perform a target operation according to the second current information and a preset overvoltage protection strategy; the target operation includes opening or closing.

9. The device according to claim 8, characterized in that The voltage transmitter is specifically used to convert the initial voltage information into second current information according to a third conversion rate, and transmit the second current information to the controller; The controller is further configured to convert the second current information according to the third conversion rate to restore the initial voltage information, and control the DC contactor to perform a target operation based on the initial voltage information and the overvoltage protection strategy.

10. The device according to claim 8, characterized in that The overcurrent protection strategy includes a current threshold condition, and the overvoltage protection strategy includes a voltage threshold condition; The controller is further configured to control the DC contactor to perform a closing operation when the first current information does not satisfy the current threshold condition and the second current information does not satisfy the voltage threshold condition.

11. An electrical device, characterized in that: include: A power supply main circuit, a DC protection device and a load branch according to any one of claims 1 to 10, wherein the power supply main circuit is connected to the load branch through the DC protection device; The main power supply circuit is used to connect to the load branch circuit for power supply when the DC contactor of the DC protection device is in a closed state.

12. A DC power supply system, characterized in that: It comprises a power supply device and the power-consuming device as claimed in claim 11; the power supply device is connected to the power supply main circuit of the power-consuming device; The power supply device is used to supply power to the load branch of the electrical equipment through the main power supply circuit and when the DC contactor of the DC protection device in the electrical equipment is in a closed state.

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