Backup power device, water chiller and data center

Abstract

The application provides a standby power device, a water chilling unit and a data center. The standby power device comprises a switching power supply, a direct current uninterrupted power supply and a lithium battery. The switching power supply has a first direct current output end. The direct current uninterrupted power supply has a direct current input end and a second direct current output end. The first direct current output end of the switching power supply is electrically connected with the direct current input end of the direct current uninterrupted power supply. The switching power supply is used for converting high-voltage alternating current into low-voltage direct current and providing the low-voltage direct current to the direct current uninterrupted power supply. The direct current uninterrupted power supply is electrically connected with the lithium battery to form a battery charging and discharging loop. The second direct current output end of the direct current uninterrupted power supply is used for providing low-voltage direct current to the water chilling unit. The application can uninterruptedly supply power to the controller and meet the requirement of quickly restarting the water chilling unit after power failure.

Description

Technical Field

[0001] This application relates to the field of power supply technology for refrigeration systems, and in particular to a backup power device, a chiller unit, and a data center. Background Technology

[0002] In data center chiller applications, there is an increasing demand for rapid restart after power outages. This is typically achieved by configuring a UPS (Uninterruptible Power Supply) to ensure uninterrupted power supply, avoid controller restarts and resets, and reduce restart time, thus meeting the requirement for rapid restart after a power outage.

[0003] Air-cooled chiller units need to meet a wide operating temperature range of -20°C to 52°C, which is beyond the capabilities of conventional UPS systems and lead-acid batteries (0°C to 40°C). Therefore, cabinet air conditioning and electric heating structures are required. However, this makes the UPS cabinet design increasingly complex and costly; moreover, the refrigerant used in the cabinet air conditioning may not meet the requirements for environmentally friendly refrigerants. Utility Model Content

[0004] The purpose of this application is to provide a backup power device, a chiller unit, and a data center that can solve at least one technical problem mentioned in the prior art.

[0005] One aspect of this application provides a backup power device for enabling rapid startup of a chiller unit after a power outage. The backup power device includes a switching power supply, a DC uninterruptible power supply (UPS), and a lithium battery. The switching power supply has a first DC output terminal, and the UPS has a DC input terminal and a second DC output terminal. The first DC output terminal of the switching power supply is electrically connected to the DC input terminal of the UPS. The switching power supply converts high-voltage AC power into low-voltage DC power and supplies it to the UPS. The UPS is electrically connected to the lithium battery to form a battery charging and discharging circuit. The second DC output terminal of the UPS provides low-voltage DC power to the chiller unit.

[0006] Furthermore, the DC uninterruptible power supply and the lithium battery are installed in the electrical control cabinet of the chiller unit.

[0007] Furthermore, the DC uninterruptible power supply and the lithium battery are installed in a cabinet, which is independent of the electrical control cabinet of the chiller unit.

[0008] Furthermore, the backup power device has a first state and a second state. Under normal power supply, the backup power device is in the first state, and the low-voltage DC power converted by the switching power supply supplies power to the chiller unit through the DC uninterruptible power supply. Under abnormal power supply, the backup power device switches from the first state to the second state, and the low-voltage DC power output by the lithium battery supplies power to the chiller unit through the DC uninterruptible power supply.

[0009] Furthermore, the backup power device also includes a control transformer, which has an input terminal and a first output terminal. The input terminal of the control transformer is used to connect to a first AC power source. The switching power supply has an AC input terminal. The first output terminal of the control transformer is electrically connected to the AC input terminal of the switching power supply. The control transformer is used to convert the first AC power source into a second AC power source and provide it to the switching power supply through the first output terminal.

[0010] Furthermore, the control transformer also has a second output terminal, which is used to supply the second AC power to the load through the second output terminal.

[0011] Furthermore, the backup power device also includes a power module, which has a low-voltage DC input port and multiple low-voltage DC output ports. The low-voltage DC input port of the power module is electrically connected to the second DC output terminal of the DC uninterruptible power supply, and the multiple low-voltage DC output ports of the power module are respectively used to connect to the controller of the chiller unit and low-voltage electrical equipment.

[0012] Furthermore, the high-voltage AC power includes 110V AC power, and the low-voltage DC power includes 24V DC power.

[0013] Another aspect of this application provides a chiller unit. The chiller unit includes the backup power device described above.

[0014] Another aspect of this application provides a data center. The data center includes a chiller unit as described above, the chiller unit being used to provide cooling water to the heat-generating equipment of the data center.

[0015] The backup power device, chiller unit, and data center of this application, according to one or more embodiments, have at least one of the following beneficial technical effects: (1) Only DC 24V backup power is provided, which meets the requirements of fast restart while greatly reducing the UPS and battery capacity; (2) Compared with AC UPS, DC UPS does not have intermediate voltage conversion, which reduces the number of rectifier and inverter circuits, reduces the number of transformers, and has a simpler structure and greatly reduces the installation size. (3) The use of lithium batteries can withstand the high and low temperature operating range required by the chiller unit, reducing the configuration of cabinet air conditioners and electric heating, and greatly improving reliability; (4) It satisfies the quick start function and greatly reduces costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a backup power device in related technologies.

[0017] Figure 2 This is a schematic diagram of a backup power device according to an embodiment of this application.

[0018] Figure 3 for Figure 2 The diagram shows the backup power device during normal power supply.

[0019] Figure 4 for Figure 2 The diagram shows the backup power device in case of abnormal power supply. Detailed Implementation

[0020] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses consistent with some aspects of this application as detailed in the appended claims.

[0021] Figure 1 A schematic diagram of a backup power device 100 in the related art is shown. For example... Figure 1 As shown, the backup power device 100 is an AC backup power device 100, which includes a first control transformer 110, a second control transformer 120, an AC uninterruptible power supply (AC UPS, Alternating Current Uninterruptible Power Supply) 130, a lead-acid battery 140, and a power module 150.

[0022] The input terminal of the first control transformer 110 is used to connect to a 380V AC mains power supply, and the output terminal of the first control transformer 110 is connected to the input terminal of the AC UPS 130. The first control transformer 110 is used to convert the 380V AC mains power supply to a 220V power supply and provide it to the AC UPS 130.

[0023] The output of AC UPS 130 is connected to the input of the second control transformer 120. AC UPS 130 provides a stable 220V AC power supply to the first control transformer 110. AC UPS 130 is also electrically connected to a lead-acid battery 140. AC UPS 130 includes a rectifier, an inverter, and a battery charging and discharging circuit. The rectifier converts the 220V AC power supply into high-voltage DC power, and the inverter converts the high-voltage DC power output from the rectifier into low-voltage DC power.

[0024] The second control transformer 120 is used to convert 220V AC power into 110V AC power and 27V AC power respectively. The 110V AC power is supplied to the load, and the 27V AC power is supplied to the low-voltage AC input port 151 of the power module 150.

[0025] The power module 150 has multiple low-voltage DC output ports 152. The power module 150 is used to convert 27V AC power from the low-voltage AC input port 151 into 24V DC power and supply it to the controller of the chiller unit and low-voltage electrical equipment through the multiple low-voltage DC output ports 152.

[0026] The AC UPS 130 in the backup power device 100 has a 220V AC input and a 220V AC output, and can provide backup power to the control power supply of the chiller unit (including 110V AC power supply and controller and other low voltage).

[0027] However, the backup power device 100 uses an AC UPS 130 plus a lead-acid battery 140 configuration, which results in a large UPS capacity, large structural size, and high cost. In addition, the AC UPS 130 plus lead-acid battery 140 configuration cannot meet the high and low temperature operation requirements of the chiller unit, and air conditioning and electric heating structures need to be added, which makes the UPS cabinet design more complicated and further increases the cost.

[0028] In view of this, this application provides an improved backup power device that can effectively solve at least one technical problem existing in the above-mentioned related technologies.

[0029] The backup power device, chiller unit, and data center of this application will now be described in detail with reference to the accompanying drawings. Unless otherwise specified, the features of the following embodiments and implementations can be combined with each other.

[0030] Figure 2 A schematic diagram of a backup power device 200 according to one embodiment of this application is shown. This backup power device 200 is a DC backup power device that can be used to achieve rapid start-up of a chiller unit after a power outage. Figure 2 As shown, a backup power device 200 in one embodiment of this application may include a switching power supply 220, a DC uninterruptible power supply (DC UPS) 230, and a lithium battery 240.

[0031] The switching power supply 220 has a first DC output terminal and is used to convert high-voltage AC power into low-voltage DC power and provide it to the DC uninterruptible power supply 230.

[0032] Optionally, the high-voltage AC power may include, for example, 110V AC power, and the low-voltage DC power may include 24V DC power.

[0033] The uninterruptible power supply 230 has a DC input terminal and a second DC output terminal. The first DC output terminal of the switching power supply 220 is electrically connected to the DC input terminal of the uninterruptible power supply 230. The second DC output terminal of the uninterruptible power supply 230 is used to provide a stable low-voltage DC power to the chiller unit. The uninterruptible power supply 230 is electrically connected to the lithium battery 240 to form a battery charging and discharging circuit.

[0034] The DC UPS 230 in the backup power device 200 of this application, for example, has a 24V DC input and a 24V DC output. The backup power device 200 of this application can provide backup power only to the DC 24V power supply of the controller in the chiller unit, which can ensure that the controller and all low-voltage power modules in the chiller unit are uninterrupted, thereby avoiding controller restart and reset, reducing restart time, and achieving the requirement of fast start after power failure in conjunction with fast start control logic.

[0035] The backup power device 200 of this application does not provide backup power for AC 110V, mainly because the AC 110V control power does not affect the restart of the controller. Reducing the AC 110V load capacity can reduce the capacity of the backup power device 200, thereby reducing the required capacity of the lithium battery 240.

[0036] The backup power device 200 of this application uses a lithium battery 240, which can directly meet the operating temperature of the air-cooled chiller unit, greatly improving reliability and eliminating the need for auxiliary design of cabinet air conditioning.

[0037] The DC UPS 230 in the backup power device 200 of this application only has a battery charging and discharging circuit, and does not require a rectifier and inverter. Therefore, relative to Figure 1 Compared to the backup power device 100, the backup power device 200 of this application has a simple structure and a greatly reduced size.

[0038] The backup power device 200 of this application adopts a configuration of DC UPS 230 plus lithium battery 240, which can reduce the UPS capacity, reduce the structural size, and reduce the cost. Moreover, the configuration of DC UPS 230 plus lithium battery 240 can meet the high and low temperature operation requirements of the chiller unit.

[0039] In one embodiment, the DC uninterruptible power supply 230 and the lithium battery 240 can be installed nearby in the electrical control cabinet of the chiller unit.

[0040] In another embodiment, the DC uninterruptible power supply 230 and the lithium battery 240 can also be installed separately in a cabinet, which is independent of the electrical control cabinet of the chiller unit.

[0041] Continue to refer to Figure 2 The backup power device 200 of this application also includes a control transformer 210.

[0042] The control transformer 210 has an input terminal and a first output terminal. The input terminal of the control transformer 210 is used to connect to a first AC power source (e.g., 380V AC mains power). The switching power supply 220 has an AC input terminal. The first output terminal of the control transformer 210 is electrically connected to the AC input terminal of the switching power supply 220. The control transformer 210 is used to convert the first AC power source into a second AC power source and provide it to the switching power supply 220 through the first output terminal.

[0043] For example, control transformer 210 can convert 380V AC power to 110V AC power and supply it to switching power supply 220. Switching power supply 220 can convert 110V AC power to 24V DC power and supply it to DC UPS 230. DC UPS 230 has 24V DC input and 24V DC output.

[0044] In some embodiments, the control transformer 210 of this application further has a second output terminal. The control transformer 210 is also used to supply a second AC power supply to the load through the second output terminal. For example, the control transformer 210 can supply a 110V AC power supply to the load.

[0045] In some embodiments, the backup power device 200 of this application further includes a power module 250.

[0046] The power module 250 has a low-voltage DC input port 251 and multiple low-voltage DC output ports 252. The low-voltage DC input port 251 of the power module 250 is electrically connected to the second DC output terminal of the DC uninterruptible power supply 230. The multiple low-voltage DC output ports 252 of the power module 250 are respectively used to connect to the controller of the chiller unit and various low-voltage power modules. For example, the 24V DC power output from the DC UPS 230 is supplied to the low-voltage DC input port 251 of the power module 250. Then, 24V DC power can be provided to the controller of the chiller unit and various low-voltage power modules through the multiple low-voltage DC output ports 252 of the power module 250. The power module 250 of this application actually functions as a power relay station.

[0047] The DC uninterruptible power supply 230 of this application has a first state and a second state.

[0048] Figure 3 Revealed Figure 2 This is a schematic diagram of the backup power device 200 during normal power supply. Figure 3 As shown, under normal power supply conditions, the backup power device 200 of this application is in the first state. The 380V mains power supply is transmitted through the control transformer 210, which outputs 110V AC power to the control load. Another path is converted to 24V low-voltage DC power through the switching power supply 220. The 24V low-voltage DC current is transmitted through the DC uninterruptible power supply 230, which outputs 24V low-voltage DC power to supply power to the power module 250, and then supplies power to the controller of the chiller unit and all low-voltage power modules.

[0049] Figure 4 Revealed Figure 2 This is a schematic diagram of the backup power device 200 in case of abnormal power supply. Figure 4 As shown, in the event of an abnormal power supply, the backup power device 200 of this application automatically switches from the first state to the second state, powered by the lithium battery 240. The lithium battery 240 switches to operation, directly outputting 24V low-voltage DC power and supplying power to the power module 250 through the DC uninterruptible power supply 230, ensuring uninterrupted power supply to the chiller unit's controller and all low-voltage electrical modules, thereby avoiding controller restart and reset and reducing restart time. Once the chiller unit's power supply is restored within a short time, the controller can execute a rapid compressor restart, achieving the requirement of rapid start-up after a power outage. If the power outage exceeds 15 minutes, the lithium battery 240's power supply is interrupted.

[0050] The backup power device 200 of this application can have at least the following beneficial technical effects: (1) Only DC 24V backup power is provided, which meets the requirements of fast restart while greatly reducing the UPS and battery capacity; (2) Compared with AC UPS, DC UPS 230 has no intermediate voltage conversion, which reduces the number of rectifier and inverter circuits, reduces the number of transformers, simplifies the structure, and greatly reduces the installation size; (3) The use of lithium battery 240 can withstand the high and low temperature operating range required by the chiller unit, reducing the configuration of cabinet air conditioner and electric heating, and greatly improving reliability; (4) It satisfies the quick start function and greatly reduces costs.

[0051] This application also provides a chiller unit. The chiller unit includes the backup power unit 200 as described above.

[0052] This application also provides a data center. The data center includes a chiller unit as described above, which can provide cooling water for the data center's heat-generating equipment.

[0053] The chiller unit and data center of this application have beneficial technical effects that are substantially similar to the backup power device 200 described above, so they will not be described again here.

[0054] The backup power device, chiller unit, and data center provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the backup power device, chiller unit, and data center of this application. The descriptions of the embodiments above are only for helping to understand the core ideas of this application and are not intended to limit this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the spirit and principles of this application, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A backup power device, characterized in that, The system includes a switching power supply, a DC uninterruptible power supply (UPS), and a lithium battery. The switching power supply has a first DC output terminal, and the UPS has a DC input terminal and a second DC output terminal. The first DC output terminal of the switching power supply is electrically connected to the DC input terminal of the UPS. The switching power supply is used to convert high-voltage AC power into low-voltage DC power and supply it to the UPS. The UPS is electrically connected to the lithium battery to form a battery charging and discharging circuit. The second DC output terminal of the UPS is used to supply low-voltage DC power to a chiller unit.

2. The backup power device as described in claim 1, characterized in that, The DC uninterruptible power supply and the lithium battery are installed in the electrical control cabinet of the chiller unit.

3. The backup power device as described in claim 1, characterized in that, The DC uninterruptible power supply and the lithium battery are installed in a cabinet, which is independent of the electrical control cabinet of the chiller unit.

4. The backup power device as described in claim 1, characterized in that, The backup power device has a first state and a second state. During normal power supply, the backup power device is in the first state, and the low-voltage DC power converted by the switching power supply supplies power to the chiller unit through the DC uninterruptible power supply. In the event of an abnormal power supply, the backup power device switches from the first state to the second state, and the lithium battery outputs low-voltage DC power to supply power to the chiller unit through the DC uninterruptible power supply.

5. The backup power device as described in claim 2, characterized in that, It also includes a control transformer having an input terminal and a first output terminal. The input terminal of the control transformer is used to connect to a first AC power source. The switching power supply has an AC input terminal. The first output terminal of the control transformer is electrically connected to the AC input terminal of the switching power supply. The control transformer is used to convert the first AC power source into a second AC power source and provide it to the switching power supply through the first output terminal.

6. The backup power device as described in claim 5, characterized in that, The control transformer also has a second output terminal, which is used to supply the second AC power to the load through the second output terminal.

7. The backup power device as described in claim 1, characterized in that, It also includes a power module, which has a low-voltage DC input port and multiple low-voltage DC output ports. The low-voltage DC input port of the power module is electrically connected to the second DC output terminal of the DC uninterruptible power supply. The multiple low-voltage DC output ports of the power module are respectively used to connect to the controller of the chiller unit and low-voltage electrical equipment.

8. The backup power device as described in any one of claims 1 to 7, characterized in that, The high-voltage AC power includes 110V AC power, and the low-voltage DC power includes 24V DC power.

9. A water chiller unit, characterized in that, Includes the backup power device as described in any one of claims 1 to 8.

10. A data center, characterized in that, Includes the chiller unit as described in claim 9, the chiller unit being used to provide cooling water for the heat-generating equipment in the data center.

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