Direct current power supply system and integrated power supply device

Abstract

The application provides a direct current power supply system and an integrated power supply device. The direct current power supply system is used for converting alternating current of a power grid into direct current and supplying power to a direct current bus. The direct current power supply system comprises a rectification module and a battery module. An output end of the rectification module and an output end of the battery module are connected with the direct current bus. When a voltage of the battery module is within a preset voltage range, an output voltage of the rectification module follows the voltage output of the battery module, and the output voltage of the rectification module is greater than the voltage of the battery module. When the voltage of the battery module is lower than the preset voltage range, the output voltage of the rectification module is a preset voltage, and the preset voltage is within the preset voltage range. The application can improve the power supply stability of the direct current power supply system.

Description

Technical Field

[0001] This application relates to the field of power grid supply technology, and in particular to a DC power supply system and an integrated power supply device. Background Technology

[0002] The power grid uses a DC power supply system to supply power to various loads on the DC bus. The stability of the DC power supply system directly determines whether the loads on the DC bus can operate stably. The higher the stability of the DC power supply system, the higher the reliability of the loads operating stably on the DC bus. Therefore, the stability of the DC power supply system is particularly important.

[0003] DC power supply systems typically use lithium batteries as backup power. In practical applications, the voltage of lithium batteries may suddenly rise at the end of charging. The lithium battery may supply power to the DC bus because its voltage is higher than the output voltage of the DC system, resulting in frequent charging and discharging of the lithium battery. This affects the lifespan of the lithium battery and causes it to fail to provide backup when the DC system output is abnormal, thus reducing the reliability of the DC power supply system. Summary of the Invention

[0004] This application provides a DC power supply system and an integrated power supply device to avoid frequent charging and discharging of lithium batteries, which would affect the battery's capacity and reduce the reliability of the DC power supply system.

[0005] In a first aspect, embodiments of this application provide a DC power supply system for converting AC power from the power grid into DC power and supplying power to a DC bus. The DC power supply system includes a rectifier module and a battery module.

[0006] Both the output terminals of the rectifier module and the battery module are connected to the DC bus. The rectifier module is used to connect between the power grid and the DC bus, and the battery module is used to connect between the power grid and the DC bus.

[0007] Specifically, when the battery module voltage is within the preset voltage range, the rectifier module output voltage follows the battery module voltage output, and the rectifier module output voltage is greater than the battery module voltage; when the battery module voltage is lower than the preset voltage range, the rectifier module output voltage is the preset voltage, and the preset voltage is within the preset voltage range.

[0008] In one possible implementation, the rectifier module includes a rectifier unit and a first controller, the first controller being connected to the rectifier unit and the battery module respectively;

[0009] The rectifier unit is used to perform rectification and conversion to convert the AC voltage of the power grid into DC voltage and supply power to the DC bus;

[0010] The first controller is used to acquire the voltage of the battery module and control the output voltage of the rectifier unit to follow the voltage of the battery module within a preset voltage range.

[0011] In one possible implementation, the battery module includes a charging unit, a battery, and a second controller;

[0012] The charging unit is connected to the power grid and the battery respectively, and the battery is connected to the DC bus;

[0013] The second controller is connected to the charging unit and the battery respectively. It is used to control the charging unit to charge the battery when the remaining capacity of the battery is lower than the preset capacity, and to control the battery to enter a sleep state when the remaining capacity of the battery is greater than or equal to the preset capacity.

[0014] In one possible implementation, the battery module also includes a first switch connected between the charging unit and the battery;

[0015] The first switch is controlled by the second controller. Specifically, the second controller is used to control the first switch to close when the remaining capacity of the battery is lower than the preset capacity, and to control the first switch to open when the remaining capacity of the battery is greater than or equal to the preset capacity.

[0016] In one possible implementation, the DC power supply system also includes a discharge load and a second switch;

[0017] The second switch has its first end connected to the battery's output terminal and its second end connected to the discharge load.

[0018] In one possible implementation, the DC power supply system also includes a first reverse connection protection module;

[0019] The first reverse connection protection module is connected between the second switch and the output terminal of the battery to prevent reverse discharge of the load voltage.

[0020] In one possible implementation, the DC power supply system also includes a second reverse connection protection module;

[0021] The second reverse connection protection module is connected between the battery module and the DC bus to prevent reverse voltage from flowing back into the DC bus.

[0022] In one possible implementation, the DC power supply system also includes a third switch connected between the battery module and the DC bus, the third switch being normally closed.

[0023] In one possible implementation, the DC power supply system also includes a third reverse connection protection module and a fourth switch;

[0024] The third reverse connection protection module is connected between the fourth switch and the DC bus to prevent reverse voltage from flowing back into the DC bus; the fourth switch is also connected to the rectifier module and is normally closed.

[0025] Secondly, embodiments of this application provide a power supply device, including a DC power supply system as described in any of the first aspects above.

[0026] This application provides a DC power supply system and integrated power device. When the DC power supply system is operating normally and during battery charging, the rectifier module in the DC power supply system always prioritizes output to power the load bus. The battery module only supplies power to the load bus when the DC system malfunctions, thereby avoiding frequent charging and discharging of the battery module, which could affect battery life, and improving the stability and reliability of the DC power supply system. Furthermore, the output of the rectifier module is more stable than that of the battery module; prioritizing its power supply also ensures the stability and reliability of the DC power supply system. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of a DC power supply system provided in an embodiment of this application;

[0029] Figure 2 This is a schematic diagram of a second structure of the DC power supply system provided in the embodiments of this application;

[0030] Figure 3 This is a schematic diagram of a third structure of the DC power supply system provided in the embodiments of this application;

[0031] Figure 4 This is a schematic diagram of the fourth structure of the DC power supply system provided in the embodiments of this application;

[0032] Figure 5 This is a schematic diagram of the fifth structure of the DC power supply system provided in the embodiments of this application;

[0033] Figure 6 This is a schematic diagram of the sixth structure of the DC power supply system provided in the embodiments of this application;

[0034] Figure 7 This is a schematic diagram of the seventh structure of the DC power supply system provided in the embodiments of this application;

[0035] Figure 8This is a schematic diagram of the eighth structure of the DC power supply system provided in the embodiments of this application;

[0036] Figure 9 This is a schematic diagram of the ninth structure of the DC power supply system provided in the embodiments of this application;

[0037] Figure 10 This is a schematic diagram of the tenth structure of the DC power supply system provided in the embodiments of this application. Detailed Implementation

[0038] To enable those skilled in the art to better understand this solution, the technical solutions in the embodiments of this solution will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this solution, not all of them. Based on the embodiments of this solution, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this solution.

[0039] The term "comprising" and any other variations thereof in the specification, claims, and accompanying drawings of this invention mean "including but not limited to," and are intended to cover a non-exclusive inclusion, not limited to the examples listed herein. Furthermore, the terms "first" and "second," etc., are used to distinguish different objects, not to describe a specific order.

[0040] The implementation of this application will be described in detail below with reference to the specific accompanying drawings:

[0041] Figure 1 This is a schematic diagram of a DC power supply system provided in an embodiment of this application, such as... Figure 1 As shown, a DC power supply system 10 is used to convert AC power from the power grid 20 into DC power and supply power to the DC bus BUS. The DC power supply system 10 includes a rectifier module 11 and a battery module 12.

[0042] The output terminals of the rectifier module 11 and the battery module 12 are both connected to the DC bus BUS. The rectifier module 11 is used to connect between the power grid 20 and the DC bus BUS, and the battery module 12 is used to connect between the power grid 20 and the DC bus BUS.

[0043] Specifically, when the voltage of the battery module 12 is within a preset voltage range, the output voltage of the rectifier module 11 follows the voltage output of the battery module 12, and the output voltage of the rectifier module 11 is greater than the voltage of the battery module 12; when the voltage of the battery module 12 is lower than the preset voltage range, the output voltage of the rectifier module 11 is the preset voltage, and the preset voltage is within the preset voltage range.

[0044] like Figure 1 As shown, the DC power supply system 10 can have two power supply lines:

[0045] Power supply line 1: Power grid 20 → Rectifier module 11 → DC bus BUS.

[0046] Power supply line 2: Battery module 12 → DC bus BUS.

[0047] In the embodiments of this application, the power grid 20 is connected to the battery module 12, and the power grid 20 can charge the battery module 12, wherein the battery module may include a lithium battery.

[0048] To ensure the priority of the power grid 20 supplying power to the DC bus BUS through the rectifier module 11, the rectifier module 11 can output voltage within a preset voltage range following the voltage of the battery module 12, and the output voltage of the rectifier module 11 is greater than the voltage of the battery module 12.

[0049] Specifically, the rectifier module 11 is connected to the battery module 12. The rectifier module 12 can detect the voltage of the battery module 12 and output voltage following the voltage of the battery module 12 within a preset voltage range, while ensuring that the output voltage of the rectifier module 12 is higher than the voltage of the battery module 12, so that the rectifier module 11 can preferentially supply power to the DC bus BUS. The preset voltage range can be the normal voltage range of the DC bus, for example, the preset voltage range can be 220V±10%, that is, 198V~242V.

[0050] When the rectifier module 12 detects that the voltage of the battery module 12 is lower than the preset voltage range, in order to avoid insufficient power supply to the DC bus BUS due to continuing to follow the voltage output of the battery module 12, the output voltage of the rectifier module 12 needs to be fixed to the preset voltage. The preset voltage is a voltage within the preset voltage range, which can be set according to the actual situation.

[0051] Optionally, when the voltage of the battery module 12 is within a preset voltage range, the rectifier module 12 can control the output voltage to always be greater than the preset voltage value of the battery module 12 for output. For example, the preset value can be 2V, 3V or 5V, which can be set according to the actual situation.

[0052] For example, the preset voltage range is 198V to 242V, and the preset value is 2V.

[0053] The rectifier module 11 monitors the voltage of the battery module 12 in real time. During the charging process of the battery module 12, the voltage of the battery module 12 gradually increases. If the voltage of the battery module 12 is detected to be lower than 198V, the output voltage of the rectifier module 11 can be controlled at 220V. At this time, the power grid 20 provides a power supply voltage of 381V to the DC bus BUS through the rectifier module 11.

[0054] As charging time increases, the voltage of battery module 12 gradually rises. When the voltage of battery module 12 reaches a preset voltage range, rectifier module 12 controls its output voltage to follow the voltage of battery module 12, and always maintains a voltage 2V higher than the battery voltage. For example, if the voltage of battery module 12 is 200V, the output voltage of rectifier module 11 is controlled at 202V. Or, if the voltage of battery module 12 is 210V, the output voltage of rectifier module 11 is controlled at 212V. The voltage of rectifier module 11 is always higher than that of battery module 12, ensuring that the power grid 20 can preferentially supply power to the DC bus BUS through rectifier module 11, while battery module 12 remains in a charging state and does not need to discharge.

[0055] Generally, the maximum voltage of battery module 12 will not exceed the preset voltage range. However, to improve the reliability of the DC power supply system, the following following strategy is set:

[0056] When the voltage of the battery module 12 is higher than the preset voltage range and the duration does not exceed the preset duration, the output voltage of the rectifier module 11 continues to follow the voltage output of the battery module 12, and the output voltage of the rectifier module 11 remains greater than the voltage of the battery module 12.

[0057] When the voltage of the battery module 12 is higher than the preset voltage range and the duration exceeds the preset duration, the output voltage of the rectifier module 11 does not follow the voltage output of the battery module 12, and an alarm signal is output, and the battery module 12 is controlled to stop outputting. The alarm signal is used to indicate that the voltage of the battery module 12 is abnormal.

[0058] By detecting the voltage of the battery module 12 and setting the corresponding output voltage following strategy and alarm strategy of the rectifier module 11, it can be ensured that the power grid 20 prioritizes power supply to the DC bus BUS through the rectifier module 11, avoid frequent triggering and waking up of the battery module 12, ensure the power of the battery module 12, and improve the power supply reliability of the DC power supply system.

[0059] This application embodiment ensures the stability of DC bus load operation by setting up two power supplies, while prioritizing the power supply to the rectifier module can guarantee the battery module's power and avoid consuming battery power, further improving the reliability of power supply.

[0060] Figure 2 This is a schematic diagram of a second structure of the DC power supply system provided in the embodiments of this application, as shown below. Figure 2 As shown, in some embodiments of this application, the rectifier module 11 includes a rectifier unit 111 and a first controller 112, which is connected to the rectifier unit 111 and the battery module 12 respectively.

[0061] The rectifier unit 111 is connected between the power grid 20 and the DC bus BUS. The rectifier unit 111 is used to perform rectification and conversion to convert the AC voltage of the power grid 20 into DC voltage and supply power to the DC bus BUS.

[0062] The first controller 112 is used to collect the voltage of the battery module 12 and control the output voltage of the rectifier unit 111 to follow the voltage of the battery module 12 within a preset voltage range. The output voltage of the rectifier unit 111 is the same as the output voltage of the rectifier module 12; that is, within the preset voltage range, the output voltage of the rectifier unit 111 is greater than the voltage of the battery module 12.

[0063] The first controller 112 is also used to control the output voltage of the rectifier unit 111 to a preset voltage when the voltage of the battery module 12 is lower than a preset voltage range, and the preset voltage is within a preset voltage range.

[0064] The first controller 112 includes a voltage acquisition circuit that can acquire the voltage of the battery module 12. The rectifier unit 111 can be a rectifier circuit composed entirely of switching transistors. The first controller 112 controls the output voltage of the rectifier unit 111 by adjusting the duty cycle of each switching transistor.

[0065] Furthermore, when the voltage of the battery module 12 is higher than the preset voltage range and the duration does not exceed the preset duration, the first controller 112 controls the output voltage of the rectifier unit 112 to continue to follow the voltage output of the battery module 12, and keeps the output voltage of the rectifier unit 111 greater than the voltage of the battery module 12.

[0066] When the voltage of the battery module 12 is higher than the preset voltage range and the duration exceeds the preset duration, the first controller 112 controls the output voltage of the rectifier unit 112 to not follow the voltage output of the battery module 12, outputs an alarm signal, and controls the battery module 12 to stop outputting. The alarm signal is used to indicate that the voltage of the battery module 12 is abnormal.

[0067] Optionally, the first controller 112 includes a communication circuit for communication with external systems, allowing alarm information to be sent to external sources, such as a detection platform. Alternatively, the DC power supply system 10 may also include an indicator light module, whereby the first controller 112 can output alarm signals to the indicator light module to illuminate the corresponding indicator light, facilitating timely identification of the cause and location of the fault by staff.

[0068] In the embodiments of this application, the first controller 112 can be a monitoring card.

[0069] This embodiment of the application uses a first controller 112 to detect the voltage of the battery module 12 and control the output voltage of the rectifier unit 111. This ensures the priority of the power grid 20 supplying power to the DC bus BUS through the rectifier unit 111, preventing the battery module 12 from being frequently woken up. Furthermore, by using the first controller 112 to monitor the battery module 12 in real time, voltage tracking can be more accurate and reliable, ensuring the output reliability of the rectifier unit 111 and improving the operational reliability of the DC power supply system.

[0070] Figure 3 This is a schematic diagram of a third structure of the DC power supply system provided in the embodiments of this application, as shown below. Figure 3 As shown, in some embodiments of this application, the battery module 12 includes a charging unit 121, a battery 122, and a second controller 123.

[0071] The charging unit 121 is connected to the power grid 20 and the battery 122 respectively, and the battery 122 is connected to the DC bus BUS.

[0072] The second controller 123 is connected to the charging unit 121 and the battery 122 respectively. It is used to control the charging unit 121 to charge the battery 122 when the remaining capacity of the battery 122 is lower than the preset capacity, and to control the battery 122 to enter a sleep state when the remaining capacity of the battery 122 is greater than or equal to the preset capacity.

[0073] In the embodiments of this application, the charging unit 121 can be an AC / DC conversion unit used to convert the alternating current of the power grid 20 into direct current to charge the battery 122.

[0074] The second controller 123 can be a battery management chip, used to detect the remaining capacity of the battery 122, control the working status of the charging unit 121, and determine whether to charge the battery 122.

[0075] In the embodiments of this application, the DC power supply system 10 may further include a charging line, specifically: power grid 20 → charging unit 121 → battery 122.

[0076] The charging process of battery module 12 can be as follows:

[0077] The second controller 123 detects the remaining capacity of the battery 122 in real time. When the remaining capacity of the battery 122 is detected to be lower than the preset capacity, it controls the charging unit 121 to start working so that the power grid 20 can charge the battery 122 through the charging unit 121.

[0078] As the charging time increases, when the second controller 123 detects that the remaining capacity of the battery 122 has reached the preset capacity, it controls the charging unit 121 to stop working and controls the battery 122 to enter a sleep state.

[0079] During charging, the rectifier module 11 monitors the voltage of the battery 122 in real time. When the voltage of the battery 122 is lower than a preset voltage range, the output voltage of the rectifier module 11 is the preset voltage. When the voltage of the battery 122 is within the preset voltage range, the output voltage of the rectifier module 11 follows the voltage of the battery 122, and the output voltage of the rectifier module 11 is always greater than the voltage of the battery 122. This ensures the power supply priority of the rectifier module 11, prevents the battery 122 from stopping charging and supplying power to the DC bus, and ensures the reliability of the DC power supply system.

[0080] The embodiments of this application realize battery charging and sleep mode through a second controller, which helps to ensure battery power and improve the power supply reliability of the DC power supply system.

[0081] Figure 4 This is a schematic diagram of the fourth structure of the DC power supply system provided in the embodiments of this application, as shown below. Figure 4 As shown, in some embodiments of this application, the battery module 12 further includes a first switch S1 connected between the charging unit 121 and the battery 122.

[0082] The first switch S1 is controlled by the second controller 123. Specifically, the second controller 123 controls the first switch S1 to close when the remaining capacity of the battery 122 is lower than a preset capacity, and controls the first switch S1 to open when the remaining capacity of the battery 122 is greater than or equal to the preset capacity. The first switch S1 can be a relay, a contactor, or a circuit breaker.

[0083] Specifically, when the second controller 123 detects that the remaining capacity of the battery 122 is lower than the preset capacity, it controls the first switch S1 to close and controls the charging unit 121 to start working so that the power grid 20 charges the battery 122 through the charging unit 121.

[0084] After detecting that the remaining capacity of the battery 122 has reached the preset capacity, the second controller 123 controls the first switch S1 to open and controls the charging unit 121 to stop working, so as to control the battery 122 to enter the dormant state and ensure the battery power.

[0085] In this embodiment, the second controller 123 controls the first switch S1 to be turned on or off, thereby connecting or disconnecting the battery 122 from the power grid. In some cases, such as during battery failure or maintenance, disconnecting the first switch S1 can isolate the battery 122, enabling independent maintenance of the battery 122.

[0086] Figure 5 This is a schematic diagram of the fifth structure of the DC power supply system provided in the embodiments of this application, as shown below. Figure 5As shown, in some embodiments of this application, the DC power supply system 10 further includes a discharge load 13 and a second switch S2.

[0087] The second switch S2 has its first end connected to the output terminal of battery 122 and its second end connected to the discharge load 13. The second switch S2 can be controlled by the second controller 123, and can be a relay, contactor, or circuit breaker.

[0088] The second controller 123 can also control the second switch to close when it receives an external discharge test command, so as to control the battery 122 to perform a discharge test as a discharge load 13 through the second switch S2, so as to verify whether the battery 122 is working properly.

[0089] Optionally, the discharge load 13 can be a load resistor or a discharge trolley.

[0090] In the embodiments of this application, under the premise of ensuring that the rectifier module 11 prioritizes power supply to the DC bus BUS, in order to test whether the battery 122 can work properly, the second switch S2 can be closed to perform a discharge test to verify whether the battery 122 is working properly, so as to maintain the battery activity and not affect the power supply reliability of the DC bus BUS.

[0091] Figure 6 This is a schematic diagram of the sixth structure of the DC power supply system provided in the embodiments of this application, as shown below. Figure 6 As shown, in some embodiments of this application, the DC power supply system 10 further includes a first reverse connection protection module 14.

[0092] The first reverse connection protection module 14 is connected between the second switch S2 and the output terminal of the battery 122 to prevent reverse voltage from flowing back into the discharge load 14.

[0093] Optionally, the first reverse connection protection module 14 can be a diode reverse connection protection module, wherein the anode of the diode reverse connection protection module is connected to the output terminal of the battery 122, and the cathode is connected to the second switch S2.

[0094] The embodiments of this application can effectively prevent voltage backflow from the discharge load and damage to the battery by setting a first reverse connection protection module, thereby ensuring the working reliability of the battery and the power supply reliability of the DC power supply system.

[0095] Figure 7 This is a schematic diagram of the seventh structure of the DC power supply system provided in the embodiments of this application, as shown below. Figure 7 As shown, in some embodiments of this application, the DC power supply system further includes a second reverse connection protection module 15.

[0096] The second reverse connection protection module 15 is connected between the battery module 12 and the DC bus BUS to prevent reverse voltage from flowing back into the DC bus BUS.

[0097] This application embodiment can effectively prevent DC bus voltage from flowing back into the battery (the DC bus voltage will be slightly higher than the battery voltage when the DC bus is working normally) by setting a first reverse connection protection module, thus avoiding battery damage.

[0098] Figure 8 This is a schematic diagram of the eighth structure of the DC power supply system provided in the embodiments of this application, as shown below. Figure 8 As shown, in some embodiments of this application, the DC power supply system 10 further includes a third switch S3 connected between the battery module 12 and the DC bus BUS, and the third switch S3 is normally closed.

[0099] Optionally, the third switch S3 can be controlled by a controller in the battery module 12, such as the second controller, or by the main controller of the DC power supply system 10. The third switch S3 is closed by default, enabling direct connection between the battery module 12 and the DC bus BUS.

[0100] This embodiment of the application, by setting a normally closed third switch S3, can disconnect the third switch S3 when the DC bus voltage is too high or the battery fails, thereby cutting off the connection between the battery module 12 and the DC bus BUS, reducing the probability of device damage, and improving the power supply reliability of the DC power supply system.

[0101] Figure 9 This is a schematic diagram of the ninth structure of the DC power supply system provided in the embodiments of this application, as shown below. Figure 9 As shown, in some embodiments of this application, the DC power supply system 10 further includes a third reverse connection protection module 16 and a fourth switch S4.

[0102] The third reverse connection protection module 16 is connected between the fourth switch S4 and the DC bus BUS to prevent reverse voltage from flowing back into the DC bus BUS; the fourth switch S4 is also connected to the rectifier module 11 and is normally closed.

[0103] The third reverse connection protection module 16 is used to prevent the DC bus voltage from backflowing into the rectifier module 11.

[0104] Optionally, the fourth switch S4 can be a relay, contactor, or circuit breaker. The fourth switch S4 can be controlled by the controller of the rectifier module 11, such as the first controller 112, or by the controller of the DC power supply system.

[0105] This application embodiment, by setting a normally closed fourth switch S4, can disconnect the fourth switch S4 when the DC bus voltage is too high or the battery fails, thereby cutting off the connection between the rectifier module 11 and the DC bus BUS, reducing the probability of device damage, and improving the power supply reliability of the DC power supply system.

[0106] Figure 10 This is a schematic diagram of the tenth structure of the DC power supply system provided in the embodiments of this application, as shown below. Figure 10 As shown, the battery can be discharged through the discharge test circuit via the discharge trolley, the charging unit can charge the battery through the charging circuit, and the battery can discharge to the DC bus through the discharge circuit.

[0107] like Figure 10 As shown, QF3 is the battery switch, which allows the battery to be charged and discharged when closed, and also enables individual battery isolation and independent maintenance. QF4 is the battery output switch, which is normally closed.

[0108] Figure 10 The working process of the DC power supply system shown is as follows:

[0109] The power grid charges the battery through the charging unit. Once fully charged, the battery enters a dormant state and can be activated by a discharge circuit or a discharge test circuit. The output voltage of the rectifier unit is controlled to always follow the battery voltage within a preset voltage range, and the rectifier unit's output voltage is always greater than the battery voltage. This ensures that the power grid prioritizes supplying power to the DC bus through the rectifier unit, providing a long-term stable output to the DC bus. Simultaneously, frequent battery waking for discharge is avoided. Furthermore, by incorporating reverse-bias diodes, the rectifier unit is physically isolated from charging the battery, ensuring the power supply efficiency of the DC power supply system.

[0110] This application also provides an integrated power supply device, including the DC power supply system of any of the above embodiments.

[0111] In the embodiments of this application, the DC power supply system in the above embodiments can be installed in a DC cabinet. The integrated power supply equipment may also include an AC cabinet, a DC feeder cabinet, a communication power supply cabinet, a charging cabinet, a battery cabinet, and an integrated cabinet, wherein the integrated cabinet can replace a combination of a DC cabinet and a charging cabinet.

[0112] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A DC power supply system, characterized in that, The DC power supply system is used to convert AC power from the power grid into DC power and supply power to the DC bus. The DC power supply system includes a rectifier module and a battery module. The output terminals of the rectifier module and the battery module are both connected to the DC bus. The rectifier module is used to connect between the power grid and the DC bus, and the battery module is used to connect between the power grid and the DC bus. Specifically, when the voltage of the battery module is within a preset voltage range, the output voltage of the rectifier module follows the voltage output of the battery module, and the output voltage of the rectifier module is greater than the voltage of the battery module; when the voltage of the battery module is lower than the preset voltage range, the output voltage of the rectifier module is the preset voltage, and the preset voltage is within the preset voltage range.

2. The DC power supply system as described in claim 1, characterized in that, The rectifier module includes a rectifier unit and a first controller, the first controller being connected to the rectifier unit and the battery module respectively; The rectifier unit is used to perform rectification and conversion to convert the AC voltage of the power grid into DC voltage and supply power to the DC bus; The first controller is used to acquire the voltage of the battery module and control the output voltage of the rectifier unit to follow the voltage of the battery module within a preset voltage range.

3. The DC power supply system as described in claim 1, characterized in that, The battery module includes a charging unit, a battery, and a second controller; The charging unit is connected to the power grid and the battery respectively, and the battery is connected to the DC bus; The second controller is connected to the charging unit and the battery respectively, and is used to control the charging unit to charge the battery when the remaining capacity of the battery is lower than a preset capacity, and to control the battery to enter a sleep state when the remaining capacity of the battery is greater than or equal to the preset capacity.

4. The DC power supply system as described in claim 3, characterized in that, The battery module also includes a first switch connected between the charging unit and the battery; The first switch is controlled by the second controller, which controls the first switch to close when the remaining capacity of the battery is lower than a preset capacity, and controls the first switch to open when the remaining capacity of the battery is greater than or equal to the preset capacity.

5. The DC power supply system as described in claim 3, characterized in that, The DC power supply system also includes a discharge load and a second switch; The second switch has a first end connected to the output end of the battery and a second end connected to the discharge load.

6. The DC power supply system as described in claim 5, characterized in that, The DC power supply system also includes a first reverse connection protection module; The first reverse connection protection module is connected between the second switch and the output terminal of the battery to prevent reverse discharge of the load voltage.

7. The DC power supply system as described in claim 1, characterized in that, The DC power supply system also includes a second reverse connection protection module; The second reverse connection protection module is connected between the battery module and the DC bus to prevent DC bus voltage from flowing back into the battery.

8. The DC power supply system as described in claim 1, characterized in that, The DC power supply system also includes a third switch connected between the battery module and the DC bus, the third switch being normally closed.

9. The DC power supply system according to any one of claims 1 to 8, characterized in that, The DC power supply system also includes a third reverse connection protection module and a fourth switch; The third reverse connection protection module is connected between the fourth switch and the DC bus to prevent DC bus voltage from flowing back in; the fourth switch is also connected to the rectifier module and is normally closed.

10. An integrated power supply device, characterized in that, Includes the DC power supply system as described in any one of claims 1 to 9 above.

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