Power supply system

Abstract

The invention discloses a power supply system, and relates to the field of power supply systems, a DC cabinet comprises a plurality of AC-DC modules, the AC ends of the AC-DC modules are connected in parallel to an AC bus through a plurality of AC standard interfaces, and the DC ends of the AC-DC modules are connected in parallel to a DC bus through a plurality of DC standard interfaces. The direct current bus is further connected with the battery through the DC-DC modules and the switch array in sequence, and in addition, the number of the DC-DC modules is smaller than that of the charging interfaces. Visibly, according to the scheme of the application, the AC-DC modules are integrated according to a certain number by arranging the AC standard interface and the DC standard interface in the DC cabinet, and the DC-DC modules are uniformly supplied with power through the DC bus, so that the DC cabinet comprising the plurality of AC-DC modules can be integrated through the arrangement mode; the number of AC-DC modules in the power supply system is expanded through the integratable DC cabinet, reasonable utilization of electric energy resources is realized, and the cost and the operation and maintenance cost are reduced.

Description

Technical Field

[0001] The present invention relates to the field of power supply systems, and in particular to a power supply system. Background Art

[0002] Electric bicycles, such as two-wheeled electric bicycles, are usually powered by batteries. When the battery needs to be charged, the battery is replaced and placed in a battery exchange cabinet, and the power terminal of the battery is electrically connected to the charging port of the battery exchange cabinet. The battery exchange cabinet is provided with a power system for converting the AC power output by the distribution cabinet into DC power to charge the battery.

[0003] Specifically, the power supply system is usually equipped with multiple charging submodules and charging interfaces. The input end of each charging submodule is connected to the AC power of the power distribution cabinet, and the output end is connected to the charging interface. In addition, the charging submodule and the charging interface are one-to-one. This power supply design method cannot make effective and reasonable use of electric energy resources, and the total cost is high, and the operation and maintenance costs are also high. Summary of the invention

[0004] The purpose of the present invention is to provide a power supply system, which can continue to charge the battery if individual or part of the AC-DC modules fail during the battery charging process, thereby achieving rational utilization of electric energy resources and reducing costs and operation and maintenance expenses.

[0005] In order to solve the above technical problems, the present invention provides a power supply system, comprising:

[0006] Multiple AC-DC modules are arranged in the DC cabinet to convert the AC power of the distribution network into DC power;

[0007] The DC cabinet is also provided with a plurality of AC standard interfaces and a plurality of DC standard interfaces, wherein the plurality of AC standard interfaces are used to be connected one-to-one with the AC ends of the AC-DC modules, and the plurality of DC standard interfaces are used to be connected one-to-one with the DC ends of the AC-DC modules;

[0008] The first end of the AC bus is connected to the output end of the distribution network, and the second end is connected to all the AC standard interfaces of the DC cabinet respectively;

[0009] The first end of the DC bus is respectively connected to all DC standard interfaces of the DC cabinet, and the second end is respectively connected to the first end of all DC-DC modules;

[0010] The second end of the DC-DC module is connected to the input end of the switch array, and is used to convert the direct current into direct current compatible with the battery;

[0011] The output end of the switch array is connected to a plurality of charging interfaces for realizing the connection between the DC-DC module and the battery based on control;

[0012] The number of DC-DC modules is less than the number of charging ports.

[0013] Optionally, it also includes:

[0014] The current balancing submodule corresponds to the AC-DC module one by one, the input end of the current balancing submodule is connected to the output end of the AC-DC module, and the output end is connected to the control end of the AC-DC module, so as to balance the output current of the AC-DC module.

[0015] Optionally, the current balancing submodule includes:

[0016] A first current sensor, whose input end is connected to the output end of the AC-DC module and is used to collect the output current of the AC-DC module;

[0017] A current adjustment module, the output end of which is connected to the control end of the AC-DC module;

[0018] The first controller has an input end connected to the first current sensor and an output end connected to the input end of the driving module, and is used to control the AC-DC module based on the output current and through the current adjustment module so that the output current of the AC-DC module reaches a preset current value.

[0019] Optionally, it also includes:

[0020] A fault detection and alarm module corresponds to each DC standard interface one by one. The input end of the fault detection and alarm module is connected to the corresponding AC-DC module, and is used to detect the fault condition of the AC-DC module and issue an alarm when a fault occurs in the AC-DC module.

[0021] Optionally, the fault detection alarm module includes:

[0022] A second current sensor is provided at the output end of the AC-DC module and is used to collect the output current of the AC-DC module;

[0023] and / or, a voltage sensor, disposed at an output end of the AC-DC module, for collecting an output voltage of the AC-DC module;

[0024] and / or, a temperature sensor connected to the AC-DC module for collecting the temperature of the AC-DC module;

[0025] Alarm;

[0026] The second controller is used to control the alarm to sound an alarm when the output current is greater than a current threshold, the output voltage is greater than a voltage threshold, or the temperature is greater than a temperature threshold.

[0027] Optionally, the temperature sensor includes a resistor and a thermistor;

[0028] A first end of the resistor is connected to a DC power supply, a second end is connected to a first end of the thermistor, and a common end of the connections is connected to a second controller;

[0029] A second end of the thermistor is grounded, wherein the thermistor is adhered to the AC-DC module through thermal conductive silicone.

[0030] Optionally, it also includes:

[0031] A charging cabinet is provided with a plurality of bus input standard interfaces, a plurality of DC-DC modules, and a switch array is arranged in the charging cabinet, and the input ends of the plurality of DC-DC modules are connected one by one with the plurality of bus input standard interfaces.

[0032] Optionally, the number of DC-DC modules is n, and the number of charging interfaces is t;

[0033] The switch array includes n first switches and n groups of second switches, each group of second switches includes t second switches, and the n first switches correspond one-to-one to the n DC-DC modules and one-to-one to the n groups of second switches;

[0034] For any first switch, the first end of the first switch is connected to the second end of the DC-DC module corresponding to the first switch, and the second end is connected to the first ends of t second switches corresponding to the first switch;

[0035] For any group of second switches, the second ends of the t second switches are respectively connected to the t charging interfaces in a one-to-one correspondence.

[0036] Optionally, the DC cabinet is also provided with a connector for connecting the DC cabinet with other DC cabinets.

[0037] Optionally, when the number of the DC cabinets is greater than 1, multiple DC cabinets are connected through the connecting piece, and the AC busbars corresponding to the multiple DC cabinets are merged into one line, and the DC busbars corresponding to the multiple DC cabinets are merged into one line.

[0038] The present invention provides a power supply system, wherein a DC cabinet includes a plurality of AC-DC modules, wherein the AC end of the AC-DC module is connected to the AC bus through a plurality of AC standard interfaces, and the DC end is connected to the DC bus through a plurality of DC standard interfaces, and the DC bus is connected to the battery through the DC-DC module and the switch array in turn, and the number of DC-DC modules is less than the number of charging interfaces. It can be seen that the scheme of the present application integrates the AC-DC modules according to a certain number by setting the AC standard interface and the DC standard interface in the DC cabinet, and supplies power to the plurality of DC-DC modules uniformly through the DC bus. This setting method can integrate the DC cabinet including the plurality of AC-DC modules, and expand the number of AC-DC modules in the power supply system through the integrated DC cabinet. Furthermore, based on this setting, in the process of charging the battery, if individual or part of the AC-DC modules fail, the battery can still be charged continuously, thereby realizing the rational use of electric energy resources and reducing the cost and operation and maintenance expenses. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the prior art and the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 A schematic diagram of the structure of a power supply system provided by the present invention;

[0041] Figure 2 A schematic diagram of the structure of a power supply system provided by the present invention;

[0042] Figure 3 A schematic diagram of a specific structure of a power supply system provided by the present invention;

[0043] Figure 4 A circuit diagram of a charging cabinet of a power supply system provided by the present invention;

[0044] Figure 5 A schematic diagram of a switching sequence of a power supply system provided by the present invention;

[0045] Figure 6 A circuit diagram of a DC cabinet of a power supply system provided by the present invention. DETAILED DESCRIPTION

[0046] The core of the present invention is to provide a power supply system. During the process of charging the battery, if individual or part of the AC-DC modules fail, the battery can still be charged, thereby achieving the rational use of electric energy resources and reducing costs and operation and maintenance expenses.

[0047] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] Please refer to Figure 1 and Figure 2 , Figure 1 A schematic diagram of the structure of a power supply system provided by the present invention, Figure 2 A schematic structural diagram of a power supply system provided by the present invention.

[0049] The power supply system comprises:

[0050] A plurality of AC-DC modules 11 are arranged in the DC cabinet 1 and are used to convert the AC power of the distribution network into DC power;

[0051] The DC cabinet 1 is also provided with a plurality of AC standard interfaces and a plurality of DC standard interfaces, wherein the plurality of AC standard interfaces are used to be connected one-to-one with the AC ends of the AC-DC modules 11, and the plurality of DC standard interfaces are used to be connected one-to-one with the DC ends of the AC-DC modules 11;

[0052] The first end of the AC bus A is connected to the output end of the distribution network, and the second end is connected to all the AC standard interfaces of the DC cabinet 1;

[0053] The first end of the DC bus B is respectively connected to all DC standard interfaces of the DC cabinet 1, and the second end is respectively connected to the first ends of all DC-DC modules 2;

[0054] The second end of the DC-DC module 2 is connected to the input end of the switch array 3, and is used to convert the direct current into direct current compatible with the battery;

[0055] The output end of the switch array 3 is connected to a plurality of charging interfaces 4, and is used to realize the connection between the DC-DC module 2 and the battery based on the control;

[0056] The number of DC-DC modules 2 is less than the number of charging interfaces 4 .

[0057] It can be understood that the DC cabinet 1 is connected to the distribution network through the AC bus A. When charging the battery of the electric vehicle, the AC-DC module 11 arranged inside the DC cabinet 1 converts the AC power provided by the distribution network into DC power. The DC cabinet 1 provides DC power to the DC-DC module 2 through the DC bus B. The DC-DC module 2 converts the DC power into DC power compatible with the battery. The output end of the switch array 3 is connected to multiple charging interfaces 4. When charging the battery, the battery is connected to the charging interface 4 to charge the battery.

[0058] In addition, the DC cabinet 1 includes multiple pairs of standard interfaces. The AC standard interface and the DC standard interface in the DC cabinet 1 form a pair of standard interfaces, such as A1 and B1 form a pair of standard interfaces, A2 and B2 form a pair of standard interfaces, ..., A5 and B5 form a pair of standard interfaces. The position and distance of each pair of standard interfaces match the size of the AC-DC module 11 to ensure that when the AC-DC module 11 is installed, the AC-DC module 11 can be directly snapped into a pair of standard interfaces to achieve electrical connection between the AC-DC module 11 and each pair of standard interfaces.

[0059] It should be noted that each charging interface can charge one battery. By setting the number of DC-DC modules 2 to be smaller than the number of charging interfaces 4 , different DC-DC modules 2 can be selected through the switch array 3 to charge different batteries.

[0060] It should also be noted that the AC-DC module 11 is detachably arranged inside the DC cabinet 1 , and the number of the AC-DC modules 11 can be expanded, so as to facilitate adjustment of the number of the AC-DC modules 11 inside the DC cabinet 1 .

[0061] It can be seen that the solution of the present application integrates a certain number of AC-DC modules by setting an AC standard interface and a DC standard interface in the DC cabinet, and supplies power to multiple DC-DC modules uniformly through the DC bus. This setting method can integrate the DC cabinet containing multiple AC-DC modules, and expand the number of AC-DC modules in the power supply system through the integrable DC cabinet. Furthermore, based on this setting, during the process of charging the battery, if individual or part of the AC-DC modules 11 fail, the battery can still be charged, realizing the rational use of electric energy resources and reducing costs and operation and maintenance expenses.

[0062] Based on the above embodiments:

[0063] Please refer to Figure 3 , Figure 3 A schematic structural diagram of a power supply system provided by the present invention.

[0064] As an optional embodiment, it also includes:

[0065] The current balancing submodule corresponds one-to-one with the AC-DC module 11 , the input end of the current balancing submodule is connected to the output end of the AC-DC module 11 , and the output end is connected to the control end of the AC-DC module 11 , for balancing the output current of the AC-DC module 11 .

[0066] It can be understood that in order to ensure that the output DC power of multiple AC-DC modules 11 is balanced and stable when they are in operation, a current balancing submodule is set in each AC-DC module 11, and each current balancing submodule corresponds to an AC-DC module 11 one by one. The current balancing submodule is used to detect the output current of the AC-DC module 11 connected thereto, and compare it with a preset current value to generate a control signal, and control the output current of the AC-DC module 11 until the output current reaches the preset current value, thereby improving the stability and reliability of the power supply system.

[0067] As an optional embodiment, the current balancing submodule includes:

[0068] A first current sensor, whose input end is connected to the output end of the AC-DC module 11 and is used to collect the output current of the AC-DC module 11;

[0069] A current adjustment module, the output end of which is connected to the control end of the AC-DC module 11;

[0070] The first controller has an input end connected to the first current sensor and an output end connected to the input end of the driving module, and is used to control the AC-DC module 11 based on the output current and through the current adjustment module so that the output current of the AC-DC module 11 reaches a preset current value.

[0071] It can be understood that the first current sensor collects the direct current output by the AC-DC module 11, the first controller compares the output current of the AC-DC module 11 with the preset current value, generates a control signal based on the comparison result, and sends the control signal to the current adjustment module, so that the current adjustment module adjusts the output current of the AC-DC module 11 based on the control signal until the current output by the AC-DC module 11 reaches the preset current value.

[0072] It should be noted that a corresponding current balancing submodule is provided on each AC-DC module 11 to collect and adjust the current output by each AC-DC module 11 .

[0073] It can be seen that the current balancing submodule can collect the current based on the output of the AC-DC module 11, and control and adjust it through the current adjustment module, thereby achieving balanced distribution of the current output by each AC-DC module 11 and improving the stability and reliability of the power supply system.

[0074] As an optional embodiment, it also includes:

[0075] A fault detection alarm module corresponds to each DC standard interface one by one, and the input end of the fault detection alarm module is connected to the corresponding AC-DC module 11, which is used to detect the fault condition of the AC-DC module 11 and issue an alarm when the AC-DC module 11 fails.

[0076] Taking into account that the AC-DC module 11 may have overvoltage, overcurrent or overtemperature when the power supply system is charging the battery, the present application sets up a fault detection alarm module, and the input end of the fault detection alarm module is connected to the corresponding AC-DC module 11, so that the fault condition of the AC-DC module 11 can be detected in real time.

[0077] It is understandable that by setting a fault detection and alarm module corresponding to each DC standard interface in the AC-DC module 11, it is possible to monitor in real time whether the voltage, current and temperature at the output end of the AC-DC module 11 are within the normal range. Once it is detected that the voltage, current and temperature exceed the preset safety range, the fault detection and alarm module will immediately issue an alarm. In addition, the AC-DC module 11 may encounter short circuit and overload during operation, which may cause damage to the AC-DC module 11. Setting a fault detection and alarm module can detect and handle these problems in a timely manner, thereby protecting the AC-DC module 11 to a certain extent.

[0078] In practical applications, the AC standard interface in the DC cabinet 1 corresponds one-to-one to the DC standard interface, which can be used as a group of standard interfaces, and each group of standard interfaces is on the same plane. Multiple groups of such standard interfaces can be set in the DC cabinet 1, and the DC standard interfaces in each group are set with fault detection and alarm modules one-to-one.

[0079] It can be seen that the AC-DC module 11 is provided with a fault detection alarm module corresponding to each DC standard interface, which can effectively monitor the output status of the power supply system and the cause of the failure of the AC-DC module 11, and improve the safety and reliability of the system. At the same time, it is also convenient for fault detection and processing.

[0080] As an optional embodiment, the fault detection alarm module includes:

[0081] A second current sensor is provided at the output end of the AC-DC module 11 and is used to collect the output current of the AC-DC module 11;

[0082] and / or, a voltage sensor, provided at the output end of the AC-DC module 11, for collecting the output voltage of the AC-DC module 11;

[0083] and / or, a temperature sensor connected to the AC-DC module 11 and used to collect the temperature of the AC-DC module 11;

[0084] Alarm;

[0085] The second controller is used to control the alarm to sound an alarm when the output current is greater than a current threshold, the output voltage is greater than a voltage threshold, or the temperature is greater than a temperature threshold.

[0086] It is understandable that, considering the possible faults that may occur during the operation of the AC-DC module 11 , for example, overcurrent, overvoltage or overtemperature may cause damage to the AC-DC module 11 .

[0087] The present application sets a second current sensor at the output end of the AC-DC module 11 to collect the current output by the AC-DC module 11, sets a voltage sensor to collect the output voltage of the AC-DC module 11, and sets a temperature sensor to collect the temperature of the AC-DC module 11 in real time. If the output current is greater than a preset current threshold and / or the output voltage is greater than a preset voltage threshold, and / or the temperature is greater than a preset temperature threshold, the alarm will sound an alarm, so as to adjust or shut down the AC-DC module 11 in time, thereby reducing the probability of damage to the AC-DC module 11.

[0088] It can be seen that by setting a second current sensor and / or voltage sensor, and / or temperature sensor at the output end of the AC-DC module 11, in addition to being able to monitor the voltage, current and temperature of the output end of the AC-DC module 11 in real time, it is also possible to perform an alarm process when a fault occurs, thereby improving the efficiency of charging the battery.

[0089] As an optional embodiment, the temperature sensor includes a resistor and a thermistor;

[0090] A first end of the resistor is connected to a DC power supply, a second end is connected to a first end of the thermistor, and a common end of the connections is connected to a second controller;

[0091] A second end of the thermistor is grounded, wherein the thermistor is adhered to the AC-DC module 11 through thermally conductive silicone.

[0092] In order to facilitate the collection of temperature, a resistor and a thermistor are set in the temperature sensor, and the resistor and the thermistor are connected in series to form a voltage divider, so as to collect the temperature of the AC-DC module 11. When the power supply system is not working, the thermistor is at room temperature, and the resistance value of the thermistor is the corresponding resistance value at room temperature. When the power supply system is working, when the thermistor detects that the temperature of the AC-DC module 11 rises, the resistance value at both ends of the thermistor will change, while the resistance value of the resistor is fixed, which causes the voltage value at both ends of the thermistor to change. It can be seen that the resistance value of the thermistor can more accurately represent the temperature of the AC-DC module 11, that is, the voltage value at both ends of the thermistor can more accurately represent the temperature of the AC-DC module 11.

[0093] In addition, the thermistor is glued to the AC-DC module 11 through thermally conductive silicone. On the one hand, the temperature can be quickly transferred to the thermistor through the AC-DC module 11. On the other hand, since the thickness of the thermally conductive silicone can be adjusted in a relatively large range, it can fill the gap. Generally, multiple AC-DC modules 11 are constructed in the DC cabinet 1 at a relatively close distance. Due to the adjustability of the thermally conductive silicone, the thermistor can be accurately glued to the corresponding AC-DC module 11 without accidentally covering the adjacent AC-DC module 11. In addition, the thermally conductive silicone has the functions of insulation, shock absorption, and sealing, which improves the efficiency of heat transfer and the safety of charging.

[0094] It can be seen that in the power supply system provided by the present invention, the resistance value of the resistor remains unchanged, and the resistance value of the thermistor changes with temperature. The resistance value of the thermistor represents the temperature of the AC-DC module 11, that is, the voltage value across the thermistor represents the temperature of the AC-DC module 11. In this way, the temperature of the AC-DC module 11 can be obtained more accurately according to the change in the resistance value of the thermistor. The thermistor is adhered to the AC-DC module 11 by using thermally conductive silicone, which reduces the possibility of damage to the AC-DC module 11 and improves safety and reliability when charging the battery.

[0095] Please refer to Figure 4 , Figure 4 A circuit diagram of a charging cabinet of a power supply system provided by the present invention.

[0096] As an optional embodiment, it also includes:

[0097] A charging cabinet is provided with a plurality of bus input standard interfaces, a plurality of DC-DC modules 2, and a switch array 3 are all arranged in the charging cabinet, and the input ends of the plurality of DC-DC modules 2 are connected one-to-one with the plurality of bus input standard interfaces.

[0098] Considering that multiple DC-DC modules 2 and switch arrays 3 are connected, dust may fall or management may be inconvenient, a charging cabinet is also provided in the present application, and multiple DC-DC modules 2 and switch arrays 3 are all provided in the charging cabinet, and the charging of the battery will not be affected, and the appearance is also relatively neat. If the power supply system is exposed outdoors to charge the battery of the electric vehicle, considering the factors of the external environment, such as bad weather such as rain or snow, multiple DC-DC modules 2 and switch arrays 3 are all provided in the charging cabinet, which can better protect the DC-DC modules 2 and switch arrays 3.

[0099] It is understandable that a plurality of bus input standard interfaces are provided on the charging cabinet, which are connected one-to-one with the input terminals of a plurality of DC-DC modules 2, the charging cabinet is connected to the DC cabinet 1 via the DC bus B, and a charging interface 4 is provided on the charging cabinet to charge the battery. As an optional embodiment, the charging interface 4 can be provided outside the charging cabinet.

[0100] It can be seen that placing multiple DC-DC modules 2 and switch arrays 3 in a charging cabinet can protect the DC-DC modules 2 and switch arrays 3 and reduce damage.

[0101] Please refer to Figure 5 , Figure 5 A schematic diagram of a switching sequence of a power supply system provided by the present invention.

[0102] As an optional embodiment, the number of DC-DC modules 2 is n, and the number of charging interfaces 4 is t;

[0103] The switch array 3 includes n first switches and n groups of second switches, each group of second switches includes t second switches, and the n first switches correspond one-to-one to the n DC-DC modules 2 and one-to-one to the n groups of second switches;

[0104] For any first switch, the first end of the first switch is connected to the second end of the DC-DC module 2 corresponding to the first switch, and the second end is respectively connected to the first ends of t second switches corresponding to the first switch;

[0105] For any group of second switches, the second ends of the t second switches are respectively connected to the t charging interfaces 4 in a one-to-one correspondence.

[0106] It can be understood that there are t second switches in each group, and there are n groups in total. Among them, k=n*t, and there are k second switches in total. The second end of the second switch in each group is connected to the t charging interfaces 4 in a one-to-one correspondence, so different batteries can be charged by controlling the first switch and the second switch. For example, three first switches are set, namely SW1, SW2, and SW3, and there are 5 second switches in each group. Taking the first group as an example, they are SW11, SW12, SW13, SW14, and SW15, so there are 3*5=15 second switches in total, and there are 15 second switches in total.

[0107] It should be noted that when the power supply system is working and charging at least one battery, at least one of the first switches is turned on, and at least one of the n groups of second switches connected to the first switch is turned on, so that at least one battery can be charged. Even if some of the first switches are damaged, the other first switches and the corresponding second switches in each group can cooperate with each other to power different batteries.

[0108] It can be seen that, through the cooperation between the first switch and the second switch, different batteries can be powered, thereby improving the reliability of battery charging.

[0109] As an optional embodiment, the first switch and the second switch are both relays and / or bidirectional MOS tubes.

[0110] It is understandable that the first switch and the second switch are set as relays and / or bidirectional MOS tubes. The relays have the advantages of ultra-long life and low power consumption, which can improve the reliability of the first switch and the second switch. In addition, the relays can safely support high-voltage power supplies and can withstand frequent switching operations. Bidirectional MOS tubes can prevent current from flowing in both directions when a fault occurs. For example, when overvoltage or overcurrent occurs in the power supply system, the bidirectional current can flow in time. In addition, the bidirectional MOS tube can also enhance the safety of the circuit and prevent the battery from being damaged under abnormal conditions.

[0111] It can be seen that setting the first switch and the second switch as relays and / or bidirectional MOS tubes in the switch sequence can improve the safety and reliability of the power supply system.

[0112] Please refer to Figure 6 , Figure 6 A circuit diagram of a DC cabinet 1 of a power supply system provided by the present invention.

[0113] As an optional embodiment, the DC cabinet 1 is further provided with a connector for connecting the DC cabinet 1 with other DC cabinets 1 .

[0114] As an optional embodiment, when the number of DC cabinets is greater than 1, multiple DC cabinets are connected through connectors, and the AC busbars corresponding to the multiple DC cabinets are merged into one line, and the DC busbars corresponding to the multiple DC cabinets are merged into one line.

[0115] It can be understood that a connector is provided on each DC cabinet 1, and multiple DC cabinets 1 can be connected, wherein the connector can be a clip and a slot or a bolt and a thread, and can be detachably provided on each DC cabinet 1, and the number of DC cabinets 1 can be adjusted by the mutual cooperation of the clip and the slot or the bolt and the thread.

[0116] It should be noted that all AC busses A between multiple DC cabinets 1 can be combined into one DC bus B to connect to the distribution network, and all DC busses B between multiple DC cabinets 1 can be combined into one DC bus B and connected to the DC-DC module 2, thereby achieving capacity expansion of the AC-DC module 11.

[0117] In addition, a heat dissipation system is also provided in each DC cabinet 1 to ensure heat dissipation for each internal operating component when the DC cabinet 1 is working, which can extend the service life of the DC cabinet 1 to ensure stable operation and performance of the DC cabinet 1.

[0118] It should also be noted that a power distribution cabinet is also provided in the DC cabinet 1, which can effectively transmit the electric energy in the distribution network to the DC cabinet 1 to meet different power demands.

[0119] It can be seen that by adjusting the number of DC cabinets 1 including AC-DC modules 11, the integration of the DC cabinets 1 can be achieved. In this way, even if individual or part of the DC cabinets 1 fail, the battery can still be charged uninterruptedly.

[0120] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0121] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

Claims

1. A power supply system, characterized in that: It includes: a DC cabinet, multiple AC-DC modules, multiple DC-DC modules, a switch array, an AC bus, a DC bus, and multiple charging interfaces; The plurality of AC-DC modules are arranged in the DC cabinet and are used to convert the AC power of the distribution network into DC power; The DC cabinet is also provided with a plurality of AC standard interfaces and a plurality of DC standard interfaces, wherein the plurality of AC standard interfaces are used to be connected to the AC ends of the AC-DC modules in a one-to-one correspondence, and the plurality of DC standard interfaces are used to be connected to the DC ends of the AC-DC modules in a one-to-one correspondence; The first end of the AC bus is connected to the output end of the power distribution network, and the second end is respectively connected to all the AC standard interfaces of the DC cabinet; The first end of the DC bus is respectively connected to all the DC standard interfaces of the DC cabinet, and the second end is respectively connected to the first ends of all the DC-DC modules; The second end of the DC-DC module is connected to the input end of the switch array, and is used to convert the direct current into direct current compatible with the battery; The output end of the switch array is connected to the plurality of charging interfaces, and is used to realize the connection between the DC-DC module and the battery based on control; The number of the DC-DC modules is less than the number of charging interfaces.

2. The power supply system according to claim 1, characterized in that: Also includes: A current balancing submodule corresponding one to one with the AC-DC module, wherein the input end of the current balancing submodule is connected to the output end of the AC-DC module, and the output end is connected to the control end of the AC-DC module, for balancing the output current of the AC-DC module.

3. The power supply system according to claim 2, characterized in that: The current balancing submodule comprises: A first current sensor, whose input end is connected to the output end of the AC-DC module and is used to collect the output current of the AC-DC module; A current adjustment module, the output end of which is connected to the control end of the AC-DC module; A first controller, whose input end is connected to the first current sensor and whose output end is connected to the input end of the driving module, is used for controlling the AC-DC module based on the output current and through the current adjustment module so that the output current of the AC-DC module reaches a preset current value.

4. The power supply system according to claim 1, characterized in that: Also includes: A fault detection and alarm module corresponding to each of the DC standard interfaces, wherein the input end of the fault detection and alarm module is connected to the corresponding AC-DC module, is used to detect the fault condition of the AC-DC module and issue an alarm when a fault occurs in the AC-DC module.

5. The power supply system according to claim 4, characterized in that: The fault detection alarm module comprises: A second current sensor is provided at the output end of the AC-DC module and is used to collect the output current of the AC-DC module; and / or, a voltage sensor, arranged at an output end of the AC-DC module, for collecting an output voltage of the AC-DC module; and / or, a temperature sensor connected to the AC-DC module, for collecting the temperature of the AC-DC module; Alarm; The second controller is used to control the alarm to sound an alarm when the output current is greater than a current threshold, the output voltage is greater than a voltage threshold, or the temperature is greater than a temperature threshold.

6. The power supply system according to claim 5, characterized in that: The temperature sensor includes a resistor and a thermistor; The first end of the resistor is connected to a DC power supply, the second end is connected to the first end of the thermistor and the common end of the connections is connected to the second controller; The second end of the thermistor is grounded, wherein the thermistor is adhered to the AC-DC module through thermal conductive silica gel.

7. The power supply system according to claim 1, characterized in that: Also includes: A charging cabinet, wherein a plurality of bus input standard interfaces are provided in the charging cabinet, a plurality of the DC-DC modules, and a switch array are all provided in the charging cabinet, and the input ends of the plurality of the DC-DC modules are connected one-to-one with the plurality of bus input standard interfaces.

8. The power supply system according to claim 1, characterized in that: The number of the DC-DC modules is n, and the number of the charging ports is t; The switch array includes n first switches and n groups of second switches, each group of the second switches includes t second switches, and the n first switches correspond one-to-one to the n DC-DC modules and one-to-one to the n groups of second switches; For any one of the first switches, the first end of the first switch is connected to the second end of the DC-DC module corresponding to the first switch, and the second end of the first switch is respectively connected to the first ends of t second switches corresponding to the first switch; For any group of the second switches, the second ends of the t second switches are respectively connected to the t charging interfaces in a one-to-one correspondence.

9. The power supply system according to any one of claims 1 to 8, characterized in that: The DC cabinet is also provided with a connector for connecting the DC cabinet with other DC cabinets.

10. The power supply system according to claim 9, characterized in that: When the number of the DC cabinets is greater than 1, the plurality of DC cabinets are connected via the connector, and the AC busbars corresponding to the plurality of DC cabinets are merged into one line, and the DC busbars corresponding to the plurality of DC cabinets are merged into one line.

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