Three-phase UPS system

Abstract

A three-phase UPS system (1) comprises a rectifier (100) and a battery (200). The rectifier (100) has an input side (101) being connectable to an AC power system (2) to provide first input power and to the battery (200) to provide second input power to the rectifier (100). The rectifier (100) has an output side (102) to provide a DC output power in response to a power share of the first input power and the second input power. The rectifier (100) is configured to be controlled such that the power share is adjustable.

Description

[0001] P2024 , 0923 WO N / P24- 1404W001 October 30 , 2025

[0002] 1

[0003] Description

[0004] THREE-PHASE UPS SYSTEM

[0005] Technical Field

[0006] The disclosure relates to a three-phase UPS (Uninterruptible Power Supply) system .

[0007] Background

[0008] A UPS system is often used as a power supply for the stable supply of power to essential loads in applications that require continuity of power, such as in hospitals , data centers , or in other critical processes for protecting the equipment from power failure when input power from a utility fails .

[0009] A typical UPS system comprises a recti fier which is coupled at its input side to an AC power system / a utility to receive AC input . After recti fying to DC, the DC power is supplied to an inverter which inverts the input DC power to an output AC power supply to continuously power a load . A battery is connected between the output side of the recti fier and the input side of the inverter .

[0010] In normal operation, the load is supplied from the AC power system of the utility by recti fying the AC power to DC, and then inverting DC back to AC for powering the load . The battery is charged simultaneously from the DC provided at the output side of the recti fier . I f the input power provided from the AC power system of the utility fails , the battery P2024 , 0923 WO N / P24- 1404W001 October 30 , 2025

[0011] 2 provides DC power to the inverter so that power is continuously provided to the load .

[0012] Battery boost converters are used in a UPS system to produce a stable , higher output voltage from a lower input voltage of the battery . Traditionally, UPS battery boost function has been achieved by either separate battery converter or by reusing the recti fier as a battery boost converter . Using a separate converter adds more cost to the design and increases its footprint . When reusing the recti fier as a battery boost converter, the battery cannot be discharged when the recti fier is running . In conclusion, a conventional UPS system can only be operated in a full utility operation mode in which the output power is completely provided by an AC power system of the utility, or in a full battery operation mode in which the output power is completely provided by the battery .

[0013] It would be welcome in the art to provide a three-phase UPS system which allows flexible adj ustment of the power share between an AC input power system and the battery .

[0014] Summary

[0015] An embodiment of a three-phase UPS system which allows power to be supplied to a load by adj usting the power share between the battery and an AC power system provided from the utility is speci fied in claim 1 .

[0016] According to the proposed approach, the three-phase UPS system comprises a recti fier and a battery . The recti fier has an input side which is connectable to an AC power system to provide first input power and to the battery to provide P2024 , 0923 WO N / P24- 1404W001 October 30 , 2025 second input power to the recti fier . The recti fier has an output side to provide a DC output power in response to a power share of the first input power and the second input power . The recti fier is configured to be controlled such that the power share is adj ustable .

[0017] The proposed approach of a three-phase UPS system thus achieves the important feature of operating the UPS in energy-aware applications , allowing battery discharge in parallel with providing input power from the AC power system of a utility, while maintaining the low cost and small footprint of the UPS which is reusing the recti fier as a battery converter .

[0018] According to a possible embodiment of the three-phase UPS system, the recti fier is configured to be controlled such that the power share between the first input power provided from the AC power system of the utility and the second input power provided from the battery is linearly adj ustable . The proposed configuration of the three-phase UPS system thus aims to resolve the shortcomings in both of the above- mentioned traditional methods , allowing a cost-optimi zed product that can linearly adj ust the power share between battery and utility .

[0019] Additional features and advantages of the proposed configuration of a three-phase UPS system are set forth in the detailed description that follows . It is to be understood that both the foregoing general description and the following detailed description are merely exemplary, and are intended to provide an overview or framework for understanding the nature and character of the claims . P2024 , 0923 WO N / P24- 1404W001 October 30 , 2025

[0020] Brief Description of the Drawings

[0021] The accompanying drawings are included to provide further understanding, and are incorporated in, and constitute a part of , the speci fication . As such, the disclosure will be more fully understood from the following detailed description, taken in conj unction with the accompanying figures in which :

[0022] Figure 1 shows an embodiment of a three-phase UPS system being configured to adj ust a power share between a battery and an AC power system of a utility;

[0023] Figure 2 shows a first operation mode of the three-phase UPS system in which the power share between the battery and the AC power system is adj usted to provide the complete output power from the AC power system;

[0024] Figure 3 shows a second operation mode of the three-phase UPS system in which the power share between the battery and the AC power system is adj usted to provide the complete output power from the battery;

[0025] Figure 4 shows an operation mode of the three-phase UPS system in which the power share between the battery and the AC power system is adj usted to provide the output power partly by the battery and partly by the AC power system of the utility; and

[0026] Figure 5 illustrates a linear power ramp of output power provided with the proposed configuration of a three- phase UPS system by a linearly adj usting the power share between a battery and an AC power system of a utility . P2024 , 0923 WO N / P24- 1404W001 October 30 , 2025

[0027] 5

[0028] Detailed Description

[0029] Figure 1 shows a schematic of a three-phase UPS system which allows power to be flexibly shared between a battery and an AC power system provided from a utility . The three-phase UPS system 1 comprises a recti fier 100 and a battery 200 . The recti fier 100 has an input side 101 which is connectable to an AC power system 2 to provide a first input power from the AC power system to the recti fier . The input side 101 of the recti fier 100 is further connectable to the battery 200 to provide a second input power from the battery to the recti fier 100 .

[0030] The recti fier 100 has an output side 102 to provide a DC output power in response to a power share of the first input power provided from the AC power system 2 , and the second input power provided from the battery 200 . The recti fier 100 is configured to be controlled such that the power share is adj ustable . For this purpose , the three-phase UPS system may comprise a controller 500 which is configured to control the recti fier 100 to adj ust the power share of the first input power from the AC power system 2 and the second input power from the battery 200 .

[0031] In particular, the recti fier 100 is configured to be controlled such that the power share between the first input power provided from the AC power system 2 and the second input power provided from the battery 200 is linearly adj ustable . For the purpose , the controller 500 is configured to control the recti fier 100 to linearly adj ust the power share between the first input power from the AC power system 2 and the second input power from the battery 200 . P2024,0923 WO N / P24-1404W001 October 30, 2025

[0032] Referring to Figure 1, the three-phase UPS system 1 comprises an inverter 300 which has an input side 301 and an output side 302 to provide an AC output power to a load connected to the output side 302 of the inverter 300. The input side 301 of the inverter 300 is connected to the output side 102 of the rectifier 100.

[0033] As shown in Figure 1, the three-phase UPS system 1 further comprises a battery converter 400. The battery converter 400 is configured as a battery boost converter or as a buck converter for charging the battery 200 from the DC output of the rectifier provided by the AC power system. The battery 200 is connected to the input side 301 of the inverter 300 via the battery converter 400. The three-phase UPS system 1 thus comprises, with the converter 400, a separate battery converter which may be sized, for example, for 50% UPS power, and a rectifier 100 which may be sized, for example, for 120% UPS power.

[0034] Referring to Figure 1, the rectifier 100 comprises a rectifier portion 110, a rectifier portion 120 and a rectifier portion 130. By Rectifier portion 130, it is enabled that one phase of the rectifier may or may not be used as a balancer circuit to balance the voltage of the Delink positive and negative sides.

[0035] The rectifier portion 110 is connectable at an input side 111 to the battery 200 and to a phase 31 of the AC power system 2. The rectifier portion 120 is connectable at an input side 121 to the battery 200 and to a phase 32 of the AC power system 2. Each of the rectifier portion 110 and the rectifier portion 120 has a first leg 10 and a second leg 20. P2024,0923 WO N / P24-1404W001 October 30, 2025

[0036] The respective first leg 10 of each of the rectifier portion 110 and 120 comprises a controllable semiconductor switch 11 and a controllable semiconductor switch 12. The respective second leg 20 of each of the first rectifier portion 110 and 120 comprises a controllable semiconductor switch 21 and a controllable semiconductor switch 22. The controllable semiconductor switches 11, 12, 21, 22 may be configured as IGBTs, for example. For reasons of simplicity, only the controllable semiconductor switches of the rectifier portion 110 are labelled with reference signs in Figure 1. These reference signs also apply to rectifier portion 120.

[0037] In conclusion, each phase of the rectifier comprises two parallel legs, i.e. first leg 10 and second leg 20. Both legs may be sized, for example, for 60% UPS power.

[0038] As shown in Figure 1, the controllable semiconductor switch 11 and the controllable semiconductor switch 21 are arranged in parallel between the respective input side 111 / 121 of the rectifier portion 110 / 120 and an output terminal 103 of the rectifier 100. The controllable semiconductor switch 12 and the controllable semiconductor switch 22 are arranged in parallel between the respective input side 111 / 121 of the rectifier portion 110 / 120 and an output terminal 104 of the rectifier 100.

[0039] Referring to Figure 1, the three-phase UPS system 1 comprises a switching network 600 which has an input side 601 to be connected to the AC power system 2 and an output side 602. The input side 601 of the switching network 600 is further connected to the battery 200. The switching network 600 is configured to selectively connect at least one of the AC power system 2 and the battery 200 to the rectifier 100. P2024 , 0923 WO N / P24- 1404W001 October 30 , 2025

[0040] The switching network 600 comprises a switching network portion 610 and a switching network portion 620 . The switching network portion 610 is configured to selectively connect at least one of the phase 31 of the AC power system 2 and the battery 200 to the input side 111 of the recti fier portion 110 . The switching network portion 620 is configured to selectively connect at least one of the phase 32 of the AC power system 2 and the battery 200 to the input side 121 of the recti fier portion 120 .

[0041] Each of the switching network portion 610 and 620 comprise controllable switches 631 , 632 , 633 and 634 . The controllable switches 631 , 632 , 633 and 634 may be configured as relays . For reasons of simplicity, only the controllable switches of the switching network portion 610 are labelled with reference signs in Figure 1 . These reference signs also apply to switching network portion 120 .

[0042] Referring to Figure 1 , controllable switch 631 of the switching network portion 610 is configured to connect the phase 31 of the AC power system 2 to the leg 10 of the recti fier portion 110 . Controllable switch 632 of the switching network portion 610 is configured to connect a potential 201 , for example a positive potential , of the battery 200 to the leg 10 of the recti fier portion 110 . Controllable switch 633 of the switching network portion 610 is configured to connect the phase 31 of the AC power system 2 to the leg 20 of the recti fier portion 110 . Controllable switch 634 of the switching network portion 610 is configured to connect a potential 202 , for example a negative potential , of the battery 200 to the leg 20 of the recti fier portion 110 . P2024 , 0923 WO N / P24- 1404W001 October 30 , 2025

[0043] 9

[0044] The switching network portion 620 comprises a controllable switch 631 which is configured to connect the phase 32 of the AC power system 2 to the leg 10 of the recti fier portion 120 . The switching network portion 620 comprises a controllable switch 632 which is configured to connect the potential 202 , for example a negative potential , of the battery 200 to the leg 10 of the recti fier portion 120 . The switching network portion 620 further comprises a controllable switch 633 which is configured to connect the phase 32 of the AC power system 2 to the leg 20 of the recti fier portion 120 . The switching network portion 620 comprises a controllable switch 634 which is configured to connect the potential 201 , for example a positive potential , of the battery 200 to the leg 20 of the recti fier portion 120 .

[0045] In conclusion, the three-phase UPS system 1 comprises separate controllable switches between utility phases 31 , 32 and both legs 10 and 20 of recti fier 100 . There are also controllable switches between battery potential 201 and legs 10 , 20 of recti fier 100 as well as controllable switches between battery potential 202 and legs 10 , 20 of recti fier 100 . According to the proposed approach for sharing power between AC power system 2 of the utility and battery 200 , the switching network 600 is operated in di f ferent switching modes according to the power requirement .

[0046] Figure 2 illustrates a first operation mode of the switching network 600 in which the power share between the first input power provided from the AC power system 2 and the second input power provided from the battery 200 may be adj usted such that the output power is completely provided by the AC power system 2 , or partly by the AC power system 2 and partly by the battery 200 via the battery converter 400 . P2024 , 0923 WO N / P24- 1404W001 October 30 , 2025

[0047] - 10 -

[0048] As illustrated in Figure 2 , the switching network portion 610 is configured to be controlled by the controller 500 in the first operation mode , i . e . a full utility operation mode , of the switching network 600 such that the phase 31 of the AC power system is connected to the leg 10 and the leg 20 of the recti fier portion 110 . The switching network portion 620 is configured to be controlled by the controller 600 in the first operation mode / full utility operation mode of the switching network 600 such that the phase 32 of the AC power system 2 is connected to the leg 10 and the leg 20 of the recti fier portion 120 . In conclusion, in the first / full utility operation mode of the switching network 600 , both legs of recti fier 100 are connected to the utility input .

[0049] I f output power is also to be provided in the first operation mode of the switching network from the battery 200 , input power from the battery 200 is provided via the battery converter 400 to the input side 301 of the inverter 300 according to the rating of the battery converter, e . g . 50% .

[0050] Figure 3 illustrates the configuration of the three-phase UPS system 1 in a second operation mode of the switching network 600 in which the power share between the first input power provided by the AC power system 2 and the second input power provided by the battery 200 is adj usted such that the output power is completely provided by the battery 200 .

[0051] As illustrated in Figure 3 , the switching network portion 610 is configured to be controlled by the controller 500 in the second operation mode , i . e . the full battery operation mode , of the switching network 600 such that the potential 201 , for example the positive potential , of the battery 200 is connected to the leg 10 of the recti fier portion 110 and the P2024 , 0923 WO N / P24- 1404W001 October 30 , 2025 potential 202 , for example the negative potential , of the battery 200 is connected to the leg 20 of the recti fier portion 110 . The switching network portion 620 is configured to be controlled by the controller 500 in the second operation mode / full battery operation mode of the switching network 600 such that the potential 201 , for example the positive potential , of the battery 200 is connected to the leg 20 of the recti fier portion 120 , and the potential 202 , for example the negative potential , of the battery 200 is connected to the leg 10 of the recti fier portion 120 . In conclusion, in the second / full battery operation mode of the switching network 600 , both legs of recti fier 100 are connected to the battery input .

[0052] Figure 4 shows a configuration of the three-phase UPS system 1 in which the power share between the first input power provided from the AC power system 2 and the second input power provided from the battery 200 is adj usted so that the output power is provided partly by the battery 200 and the remaining power is provided partly by the AC power system 2 . For this purpose , the switching network 600 is operated in a third operation mode , i . e . a power share operation mode .

[0053] Referring to Figure 4 , the switching network portion 610 is configured to be controlled by the controller 500 in the third operation mode / the power share operation mode of the switching network such that the phase 31 of the AC power system 2 is connected to the leg 10 of the recti fier portion 110 and the potential 202 , for example the negative potential , of the battery 200 is connected to the leg 20 of the recti fier portion 110 . The switching network portion 620 is configured to be controlled by the controller 500 in the third operation mode / power share operation mode of the P2024 , 0923 WO N / P24- 1404W001 October 30 , 2025

[0054] - 12 - switching network 600 such that the phase 32 of the AC power system 2 is connected to the leg 10 of the recti fier portion 120 and the potential 201 , for example the positive potential , of the battery 200 is connected to the leg 20 of the recti fier portion 120 .

[0055] As illustrated in Figure 4 , in the third operation mode / power share operation mode of the switching network 600 , the respective leg 10 of the recti fier portion 110 and the recti fier portion 120 is configured to provide a first power share from the AC power system 2 to the output side 102 of the recti fier 100 . Furthermore , in the third operation mode / power share operation mode of the switching network, the respective leg 20 of the recti fier portion 110 and the recti fier portion 120 is configured to provide a second power share from the battery 200 to the output side 102 of the recti fier 100 . In conclusion, in the power share operation mode of the switching network 600 , one leg of the recti fier 100 is used as recti fier or for recti fying the AC input power, and the other one as battery converter .

[0056] In the first and third operation mode of the switching network 600 , the battery converter 400 is configured to provide a third power share of the battery 2 to the input side 301 of the inverter 300 so that input power of the battery may also be provided in the first and third operation mode of the switching network 600 via the battery converter 400 to the input side 301 of inverter 300 .

[0057] The power share between the input power provided from the AC power system 2 and the input power provided from the battery 200 can be adj usted by controlling the converter currents . For this purpose , as shown in Figures 1 - 4 , the three-phase P2024,0923 WO N / P24-1404W001 October 30, 2025

[0058] UPS system 1 comprises a current sensor 700 being arranged between the rectifier 100 and the switching network 600 for measuring the currents in the leg 10 and the leg 20 of the rectifier 100. A respective current sensor 700 is provided between switching network portion 610 and each leg 10, 20 of rectifier portion 110, and a respective current senor 700 is provided between switching network portion 620 and each leg 10, 20 of rectifier portion 120.

[0059] By controlling the converter currents between the rectifier 100 and the switching network 600, the power share can be adjusted, for example, linearly between 0% from utility / 100% from battery and 100% from utility / 0% from battery. The power share of the input power or the input currents provided from the AC power system 2 and the battery 200 via switching network 600 and rectifier 100 can be controlled by controlling the controllable semiconductor switches 11, 12, 21, 22 of the rectifier portions 110 and 120, for example by controlling a duty cycle of control signals for controlling the controllable semiconductor switches 11, 12, 21, 22.

[0060] A linear share of input power provided from rectifier leg 10, rectifier leg 20, and battery converter 400, is illustrated in Figure 5. In particular, Figure 5 illustrates a linear power ramp of the output power of the three-phase UPS system 1 for providing power from 0% to 100% by the utility / AC power system 2 and from 0% to 100% by the battery 200.

[0061] If, for example, 25% of the output power is to be provided by the battery 200 and 75% of the output power is to be provided by the utility / AC power system 2, the rectifier 100, particularly the controllable semiconductor switches 11, 12, 21, 22 of the rectifier portions 110 and 120, is / are P2024,0923 WO N / P24-1404W001 October 30, 2025 controlled such that the first input power of the AC power system 2 / utility is provided from leg 10 and leg 20 of the rectifier 100, and the second input power of the battery 200 is provided from battery converter 400. On the other hand, if, for example, 75% of the output power of the three-phase UPS system 1 is to be provided by the battery 200 and 25% of the output power is to be provided by the utility / AC power system 2, about 50% of the power of the battery 200 is provided by battery converter 400, about 25% of the power of the battery 200 is provided via rectifier leg 20, and about

[0062] 25% of the power from the utility / AC power system 2 is provided via rectifier leg 10.

[0063] P2024,0923 WO N / P24-1404W001 October 30, 2025

[0064] - 15 -

[0065] List of reference signs

[0066] 1 three-phase UPS system

[0067] 2 AC power system / utility

[0068] 10 leg of rectifier

[0069] 11, 12 controllable semiconductor switches of leg 10

[0070] 20 leg of rectifier

[0071] 21, 22 controllable semiconductor switches of leg 20

[0072] 31, 32, 33 phases of AC power system

[0073] 100 rectifier

[0074] 110, 120, 130 rectifier portion

[0075] 101 input side of rectifier

[0076] 102 output side of rectifier

[0077] 200 battery

[0078] 201, 202 potential of battery

[0079] 300 inverter

[0080] 301 input side

[0081] 302 output side

[0082] 400 battery converter

[0083] 500 controller

[0084] 600 switching network

[0085] 601 input side of switching network

[0086] 602 output side of switching network

[0087] 610, 620 switching network portion

[0088] 631, 632, 633, 634 controllable switches

[0089] 700 current sensor

Claims

P2024,0923 WO N / P24-1404W001 October 30, 2025- 16 -Claims1. A three-phase UPS system, comprising:- a rectifier (100) ,- a battery (200) ,- wherein the rectifier (100) has an input side (101) being connectable to an AC power system (2) to provide first input power and to the battery (200) to provide second input power to the rectifier (100) ,- wherein the rectifier (100) has an output side (102) to provide a DC output power in response to a power share of the first input power and the second input power,- wherein the rectifier (100) is configured to be controlled such that the power share is adjustable.

2. The three-phase UPS system of claim 1, wherein the rectifier (100) is configured to be controlled such that the power share between the first input power and the second input power is linearly adjustable.

3. The three-phase UPS system of claim 1 or 2, comprising:- an inverter (300) having an input side (301) and an output side (302) to provide an AC output power,- wherein the input side (301) of the inverter (300) is connected to the output side (102) of the rectifier (100) .

4. The three-phase UPS system of claim 3, comprising:- a battery converter (400) ,- wherein the battery (200) is connected to the input side (301) of the inverter (300) via the battery converter (400) .

5. The three-phase UPS system of any of the claims 1 to 4,P2024,0923 WO N / P24-1404W001 October 30, 2025- 17 -- wherein the rectifier (100) comprises a first rectifier portion (110) and a second rectifier portion (120) ,- wherein the first rectifier portion (110) is connectable to the battery (200) and to a first phase (31) of the AC power system ( 2 ) ,- wherein the second rectifier portion (120) is connectable at to the battery (200) and to a second phase (32) of the AC power system (2) .

6. The three-phase UPS system of claim 5,- wherein each of the first and second rectifier portion (110, 120) has a first leg (10) comprising a first controllable semiconductor switch (11) and a second controllable semiconductor switch (12) ,- wherein each of the first and second rectifier portion (110, 120) has a second leg (20) comprising a third controllable semiconductor switch (21) and a fourth controllable semiconductor switch (22) .

7. The three-phase UPS system of claim 6,- wherein the first controllable semiconductor switch (11) and the third controllable semiconductor switch (21) are arranged in parallel between the respective input side (111, 121) of the first and second rectifier portion (110, 120) and a first output terminal (103) of the rectifier (100) ,- wherein the second controllable semiconductor switch (12) and the fourth controllable semiconductor switch (22) are arranged in parallel between the respective input side (111, 121) of the first and second rectifier portion (110, 120) and a second output terminal (104) of the rectifier (100) .

8. The three-phase UPS system of any of the claims 5 to 7, comprising :P2024,0923 WO N / P24-1404W001 October 30, 2025- a switching network (600) having an input side (601) to be connected to the AC power system (2) and an output side (602) ,- wherein the input side (601) of the switching network (600) is connected to the battery (200) ,- wherein the switching network (600) is configured to selectively connect at least one of the AC power system (2) and the battery (200) to the rectifier (100) .

9. The three-phase UPS system of claim 8,- wherein the switching network (600) comprises a first switching network portion (610) and a second switching network portion (620) ,- wherein the first switching network portion (610) is configured to selectively connect at least one of the first phase (31) of the AC power system (2) and the battery (200) to the input side (111) of the first rectifier portion (110) ,- wherein the second switching network portion (120) is configured to selectively connect at least one of the second phase (32) of the AC power system (2) and the battery (200) to the input side (121) of the second rectifier portion (120) .

10. The three-phase UPS system of claim 9,- wherein the first switching network portion (610) is configured to be controlled in a first operation mode of the switching network (600) such that the first phase (31) of the AC power system (2) is connected to the first and second leg(10, 20) of the first rectifier portion (110) ,- wherein the second switching network portion (620) is configured to be controlled in the first operation mode of the switching network (600) such that the second phase (32)P2024,0923 WO N / P24-1404W001 October 30, 2025 of the AC power system (2) is connected to the first and second leg (10, 20) of the second rectifier portion (120) .

11. The three-phase UPS system of claim 9 or 10,- wherein the first switching network portion (610) is configured to be controlled in a second operation mode of the switching network (600) such that the first potential (201) of the battery (200) is connected to the first leg (10) of the first rectifier portion (110) and the second potential (202) of the battery (200) is connected to the second leg (20) of the first rectifier portion (110) ,- wherein the second switching network portion (620) is configured to be controlled in the second operation mode of the switching network (600) such that the first potential (201) of the battery (200) is connected to the second leg (20) of the second rectifier portion (120) and the second potential (202) of the battery (200) is connected to the first leg (10) of the second rectifier portion (120) .

12. The three-phase UPS system of any of the claims 9 to 11,- wherein the first switching network portion (610) is configured to be controlled in a third operation mode of the switching network (600) such that the first phase (31) of the AC power system (2) is connected to the first leg (10) of the first rectifier portion (110) and the second potential (202) of the battery (200) is connected to the second leg (20) of the first rectifier portion (110) ,- wherein the second switching network portion (620) is configured to be controlled in the third operation mode of the switching network (600) such that the second phase (32) of the AC power system (2) is connected to the first leg (10) of the second rectifier portion (120) and the first potentialP2024,0923 WO N / P24-1404W001 October 30, 2025(201) of the battery (200) is connected to the second leg(20) of the second rectifier portion (120) .

13. The three-phase UPS system of claim 12, wherein, in the third operation mode of the switching network (600) , the respective first leg (10) of the first and second rectifier portion (110, 120) is configured to provide a first power share from the AC power system (2) to the output side (102) of the rectifier (100) .

14. The three-phase UPS system of claim 13, wherein, in the third operation mode of the switching network (600) , the respective second leg (20) of the first and second rectifier portion (110, 120) is configured to provide a second power share from the battery (200) to the output side (102) of the rectifier (100) .

15. The three-phase UPS system of claim 14, wherein, in the first and third operation mode of the switching network (600) , the battery converter (400) is configured to provide a third power share of the battery (2) to the input side (301) of the inverter (300) .

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