Uninterruptible power supply

Abstract

The application provides an uninterrupted power supply system, which comprises three power supply modules, each of which is composed of a switching module, a power factor correction module, an energy storage module and an inverter module. The first input ends of the three switching modules are respectively connected to three-phase signals of an alternating current power supply, and the second input ends are connected to the same direct current power supply signal. In any power supply module, the switching module is connected to the power factor correction module, the power factor correction module is connected to the energy storage module, and the energy storage module is connected to the inverter module to supply power to a load. The power factor correction module is composed of a first inductor, a second inductor, a first rectifier bridge, a second rectifier bridge, a first transistor and a second transistor. The first inductor is connected to the switching module and the first rectifier bridge, and the second inductor is connected to the switching module and the second rectifier bridge. The outputs of the rectifier bridges are connected to the transistors and the energy storage module, and finally connected to the neutral end of the alternating current power supply. The scheme of the application realizes efficient and reliable power supply without additional hardware.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, and in particular to an uninterruptible power supply. Background Technology

[0002] With the rapid development of society and economy, various industries have increasingly stringent requirements for the continuity and stability of power supply. Uninterruptible power supplies (UPS) are being used more and more widely, and the market demand for their high reliability, multi-scenario compatibility and low cost is becoming increasingly prominent. How to balance performance and cost has become the focus of the industry.

[0003] Currently, there are two main options for three-phase UPS battery power supply solutions: one is to use a three-wire battery pack for direct power supply; the other is to use a two-wire battery pack in conjunction with an independent DC / DC boost module for power supply.

[0004] However, the three-wire battery solution increases the customer's cost in battery placement and lacks flexibility; while the solution using a two-wire battery plus a separate DC / DC module requires additional hardware and balancing circuitry, which not only increases hardware costs but also design complexity. None of these solutions can simultaneously achieve low cost and high flexibility. Utility Model Content

[0005] This application provides an uninterruptible power supply (UPS) designed to address the problem that existing UPS systems struggle to simultaneously achieve low cost and high flexibility, enabling efficient and reliable power supply without the need for additional hardware.

[0006] On one hand, this application provides an uninterruptible power supply, including: three power supply modules; each of the power supply modules includes: a switching module, a power factor correction module, an energy storage module and an inverter module; wherein, the first input terminals of the three switching modules are respectively connected to the three-phase AC power signal of the AC power supply, and the second input terminals of the three switching modules are all connected to the same DC power signal;

[0007] In any power supply module, the switching module is connected to the power factor correction module; the switching module is used to provide the power signal connected to the first input terminal or the second input terminal to the power factor correction module;

[0008] The power factor correction module is connected to the energy storage module; the power factor correction module is used to store energy in the energy storage module according to the power signal provided by the switching module.

[0009] The energy storage module is connected to the inverter module, and the inverter module is connected to the load; the inverter module is used to supply power to the load according to the electrical energy provided by the energy storage module.

[0010] in,

[0011] The power factor correction module includes: a first inductor, a second inductor, a first rectifier bridge, a second rectifier bridge, a first transistor, and a second transistor; wherein,

[0012] The first end of the first inductor is connected to the first output end of the switching module, and the second end of the first inductor is connected to the first end of the first rectifier bridge and the third end of the first rectifier bridge, respectively.

[0013] The first end of the second inductor is connected to the second output end of the switching module, and the second end of the second inductor is connected to the first end and the third end of the second rectifier bridge, respectively.

[0014] The second end of the first rectifier bridge is connected to the second end of the second rectifier bridge, and the fourth end of the first rectifier bridge is connected to the fourth end of the second rectifier bridge.

[0015] The second end of the first rectifier bridge is also connected to the first end of the first transistor and the first connection end of the energy storage module;

[0016] The second end of the second rectifier bridge is also connected to the second end of the second transistor and the second connection end of the energy storage module;

[0017] The second terminal of the first transistor and the first terminal of the second transistor are both connected to the third connection terminal of the energy storage module, and the third connection terminal of the energy storage module is also connected to the neutral terminal of the AC power supply.

[0018] In one optional embodiment, the energy storage module includes a first energy storage unit and a second energy storage unit; the power factor correction module further includes a first diode and a second diode; wherein,

[0019] The first diode is connected in series between the first terminal of the first transistor and the first connection terminal of the first energy storage unit;

[0020] The second diode is connected in series between the second connection terminal of the second energy storage unit and the second terminal of the second transistor;

[0021] The second terminal of the first transistor, the first terminal of the second transistor, the second connection terminal of the first energy storage unit, and the first connection terminal of the second energy storage unit are all connected to point N, which serves as the third connection terminal of the energy storage module.

[0022] In one optional embodiment, the power supply module further includes: a control module, respectively connected to the switching module, the power factor correction module, and the inverter module; wherein,

[0023] The control module is used to control the uninterruptible power supply to be in a first power supply state when the AC power supply fails; the first power supply state is that all three switching modules provide DC power to the connected power factor correction module;

[0024] The control module is used to control the uninterruptible power supply to be in a second power supply state when the AC power supply is normal; the second power supply state is that the three switching modules respectively provide the three-phase AC power supply signals of the AC power supply to the connected power factor correction module.

[0025] In one alternative embodiment, when the uninterruptible power supply is in a first power supply state:

[0026] When the inverter module is operating in the positive half-cycle, the first transistor is turned on at a preset frequency, and the second transistor remains turned on.

[0027] When the inverter module operates in the negative half-cycle, the second transistor is turned on at a preset frequency, while the first transistor remains on.

[0028] In one optional embodiment, when the uninterruptible power supply is in the second power supply state, for any power supply module, when the input power signal is in the positive half-cycle, the first transistor is turned on at a preset frequency and the second transistor remains off; when the input power signal is in the negative half-cycle, the second transistor is turned on at a preset frequency and the first transistor remains off; the input power signal is a phase power signal of the AC power supply connected to the corresponding power supply module.

[0029] In one optional implementation, the switching module includes a first switching unit and a second switching unit;

[0030] Both the first input terminal of the first switching unit and the first input terminal of the second switching unit are connected to the control module;

[0031] The second input terminal of the first switching unit is connected to the DC power supply, the first input terminal of the first switching unit is connected to the first terminal of the first inductor, and the second output terminal of the first switching unit is connected to the first terminal of the second inductor.

[0032] The second input terminal of the second switching unit is connected to the AC power supply, the first input terminal of the second switching unit is connected to the first terminal of the first inductor, and the second output terminal of the second switching unit is connected to the first terminal of the second inductor.

[0033] in,

[0034] When the first switching unit is turned on and the second switching unit is turned off, the uninterruptible power supply is in the first power supply state;

[0035] When the second switching unit is turned on and the first switching unit is turned off, the uninterruptible power supply is in the second power supply state.

[0036] In one optional embodiment, the DC power supply includes a positive terminal and a negative terminal; the first switching unit includes a first switch and a second switch, and the second switching unit includes a third switch and a fourth switch; wherein...

[0037] The first switch is connected in series between the positive terminal of the power supply and the first terminal of the first inductor; the second switch is connected in series between the negative terminal of the power supply and the first terminal of the second inductor.

[0038] Both the third switch and the fourth switch are connected to the output terminal of the AC power supply; the output terminal of the third switch is connected to the first terminal of the first inductor; and the output terminal of the fourth switch is connected to the first terminal of the second inductor.

[0039] In one optional implementation, when the uninterruptible power supply is in the first power supply state, the three power factor correction modules operate synchronously with the same timing sequence.

[0040] In one alternative implementation, when the uninterruptible power supply is operating in a first power supply state, the inverter modules of each power supply module operate synchronously with the same power frequency cycle.

[0041] On the other hand, this application provides a power supply system, including: a load and an uninterruptible power supply as described in any one of the first aspects;

[0042] The load is connected to the output terminal of the inverter module in the uninterruptible power supply.

[0043] The uninterruptible power supply (UPS) provided in this application utilizes three independent power supply modules, each with a switching module, to connect to a three-phase AC power source while sharing a common DC power source. This enables switching between two power supply modes, enhancing power supply adaptability. Furthermore, during DC power supply, the three power factor correction modules operate synchronously with the same timing sequence, achieving efficient conversion without additional hardware, simplifying the circuit structure and reducing hardware costs. Through this scheme, under normal mains power conditions, each module independently connects to the three-phase AC signal, accurately adapting to phase sequence and phase difference to provide continuous and stable power to three-phase loads. When mains power is interrupted, it can seamlessly switch to an emergency mode relying on DC energy storage. In this mode, the three power factor correction modules work collaboratively through synchronous control, efficiently completing the three-phase AC to DC conversion without additional hardware. This ensures both the stability of conventional power supply and the reliability of emergency power supply, achieving a balance between power supply scenario flexibility and system operational stability. Attached Figure Description

[0044] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0045] Figure 1 This is a schematic diagram of the structure of an uninterruptible power supply provided in an embodiment of this application;

[0046] Figure 2 This is a schematic diagram of another power supply module provided in an embodiment of this application;

[0047] Figure 3 This is a schematic diagram of another power supply module provided in an embodiment of this application;

[0048] Figure 4 This is a schematic diagram of another power supply module provided in an embodiment of this application;

[0049] Figure 5 This is a schematic diagram of another power supply module provided in an embodiment of this application;

[0050] Figure 6 This is a schematic diagram of another power supply module provided in an embodiment of this application;

[0051] Figure 7 This is a schematic diagram of a power supply system provided in an embodiment of this application.

[0052] Explanation of reference numerals in the attached figures:

[0053] 100 - Uninterruptible power supply; 1 - Power supply module; 10 - Switching module; 20 - Power factor correction module; 30 - Energy storage module; 40 - Inverter module; L1 - First inductor; L2 - Second inductor; REC1 - First rectifier bridge; REC2 - Second rectifier bridge; Q1 - First transistor; Q2 - Second transistor; C1 - First energy storage unit; C2 - Second energy storage unit; D1 - First diode; D2 - Second diode; 50 - Control module; 11 - First switching unit; 12 - Second switching unit; S1 - First switch; S2 - Second switch; S3 - Third switch; S4 - Fourth switch; A - Power supply system; 200 - Load.

[0054] The accompanying drawings have illustrated specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to specific embodiments. Detailed Implementation

[0055] 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 numbers 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 and methods consistent with some aspects of this application as detailed in the appended claims.

[0056] A three-phase uninterruptible power supply, also known as a three-phase UPS, is a power supply protection device designed for three-phase electrical equipment. It is mainly used to ensure a stable power supply for three-phase AC loads in scenarios such as industrial equipment, data centers, and large server rooms.

[0057] As described in the background section, there are currently two main options for three-phase UPS battery power supply solutions: one is to use a three-wire battery pack for direct power supply; the other is to use a two-wire battery pack in conjunction with an independent DC / DC boost module for power supply.

[0058] However, the three-wire battery solution increases the customer's cost in battery placement and lacks flexibility; while the solution using a two-wire battery plus a separate DC / DC module requires additional hardware and balancing circuitry, which not only increases hardware costs but also design complexity. None of these solutions can simultaneously achieve low cost and high flexibility.

[0059] To address the aforementioned technical issues, this application provides an uninterruptible power supply (UPS) that uses three independent power supply modules, each containing a switching module, to connect to a three-phase AC power source while sharing a common DC power source. This enables switching between two power supply modes, improving the flexibility of power supply adaptation. Furthermore, when powered by DC, the three power factor correction modules operate synchronously with the same timing sequence, allowing for efficient conversion without additional hardware, simplifying the circuit structure and reducing hardware costs.

[0060] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0061] Figure 1 This is a schematic diagram of an uninterruptible power supply provided in an embodiment of this application. See also... Figure 1 The uninterruptible power supply 100 provided in this embodiment includes: three power supply modules 1; each of the power supply modules 1 includes: a switching module 10, a power factor correction module 20, an energy storage module 30, and an inverter module 40; wherein, the first input terminals of the three switching modules 10 are respectively connected to the three-phase AC power signal of the AC power supply, and the second input terminals of the three switching modules 10 are all connected to the same DC power signal.

[0062] In any power supply module 1, the switching module 10 is connected to the power factor correction module 20; the switching module 10 is used to provide the power signal connected to the first input terminal or the second input terminal to the power factor correction module 20; the power factor correction module 20 is connected to the energy storage module 30; the power factor correction module 20 is used to store energy in the energy storage module 30 according to the power signal provided by the switching module 10; the energy storage module 30 is connected to the inverter module 40, and the inverter module 40 is connected to the load; the inverter module 40 is used to supply power to the load according to the power provided by the energy storage module 30.

[0063] The uninterruptible power supply provided in this embodiment uses three independent power supply modules to correspond to three-phase AC power and share the same DC power. Combined with the switching module 10 equipped in each module, it realizes flexible adaptation to dual scenarios of AC power supply and DC power supply.

[0064] Optionally, when powered by an AC power source, the three power supply modules 1 are connected to the A, B, and C phase AC power signals of the three-phase AC power source through their respective switching modules 10. In this case, each power supply module 1 operates independently. Specifically, in each power supply module 1, the switching module 10 transmits the corresponding phase's AC signal to the power factor correction module 20. The power factor correction module 20 rectifies and corrects the AC signal, then charges its own energy storage module 30. The electrical energy stored in the energy storage module 30 is converted into AC power suitable for the load by the inverter module 40. Finally, the three-phase inverter modules work together to output three-phase AC power to supply power to the load.

[0065] Figure 2 A schematic diagram of another power supply module provided in an embodiment of this application. See also... Figure 2 Based on the above implementation, the power factor correction module 20 in any power supply module 1 includes: a first inductor L1, a second inductor L2, a first rectifier bridge REC1, a second rectifier bridge REC2, a first transistor Q1, and a second transistor Q2.

[0066] Wherein, the first end of the first inductor L1 is connected to the first output terminal of the switching module 10, and the second end of the first inductor L1 is connected to the first end and the third end of the first rectifier bridge REC1, respectively; the first end of the second inductor L2 is connected to the second output terminal of the switching module 10, and the second end of the second inductor L2 is connected to the first end and the third end of the second rectifier bridge REC2, respectively; the second end of the first rectifier bridge REC1 is connected to the second end of the second rectifier bridge REC2, and the first rectifier bridge REC1... The fourth terminal of the first rectifier bridge REC1 is connected to the fourth terminal of the second rectifier bridge REC2; the second terminal of the first rectifier bridge REC1 is also connected to the first terminal of the first transistor Q1 and the first connection terminal of the energy storage module 30; the second terminal of the second rectifier bridge REC2 is also connected to the second terminal of the second transistor Q2 and the second connection terminal of the energy storage module 30; the second terminal of the first transistor Q1 and the first terminal of the second transistor Q2 are both connected to the third connection terminal of the energy storage module 30, and the third connection terminal of the energy storage module 30 is also connected to the neutral terminal of the AC power supply.

[0067] In this embodiment, the power factor correction module 20, through a symmetrical circuit topology design, can achieve efficient processing of the input power signal and optimization of the power factor.

[0068] Specifically, the first inductor L1 and the second inductor L2 in the power factor correction module 20 serve as energy storage and filtering elements, respectively connected to the two output terminals of the switching module 10. They can receive AC or DC power signals transmitted by the switching module 10 under different power supply states, and use the energy storage characteristics of the inductors to smooth and filter the current to reduce the ripple component in the signal. This achieves preliminary normalization of the input power signal, laying a stable signal foundation for the efficient rectification of the rectifier bridge and the precise control of the transistors. In this way, the power factor correction module 20 can output low-ripple power to the energy storage module 30 under both AC and DC input scenarios.

[0069] Based on this, the first rectifier bridge REC1 and the second rectifier bridge REC2 are connected in a completely symmetrical manner. The first and third ends of the first rectifier bridge REC1 are connected to the second end of the first inductor L1, and the first and third ends of the second rectifier bridge REC2 are connected to the second end of the second inductor L2. This allows the rectifier bridges to perform full-wave rectification on the signal transmitted through the inductor, converting the AC signal into a pulsating DC signal, while ensuring the effective utilization of positive and negative half-cycle energy.

[0070] In addition, the second and fourth terminals of the first rectifier bridge REC1 and the second rectifier bridge REC2 are connected to each other to form a symmetrical output node. Then, through the switching control of the first transistor Q1 and the second transistor Q2, the electrical energy output to the energy storage module 30 can be precisely regulated.

[0071] Meanwhile, the three connection terminals of the energy storage module are connected to the output terminal of the rectifier bridge, the transistor, and the neutral terminal of the AC power supply, respectively. This not only achieves stable energy storage, but also maintains the potential balance of the three-phase system through the connection with the neutral terminal, ensuring that the power factor correction module can work efficiently in both AC and DC input modes, and providing a stable DC bus voltage for the subsequent inverter module.

[0072] The uninterruptible power supply 100 provided in this embodiment uses three independent power supply modules 1, each containing a switching module 10, to connect to a three-phase AC power source while sharing a common DC power source. This enables switching between two power supply modes, improving power supply adaptability flexibility. Furthermore, during DC power supply, the three power factor correction modules 20 operate synchronously with the same timing sequence, achieving efficient conversion without additional hardware, simplifying the circuit structure and reducing hardware costs. Through this scheme, under normal mains power conditions, each module independently connects to the three-phase AC signal, accurately adapting to phase sequence and phase difference to provide continuous and stable power to the three-phase load. When mains power is interrupted, it can seamlessly switch to an emergency mode relying on DC energy storage. In this mode, the three power factor correction modules 20 work collaboratively through synchronous control, efficiently completing the DC to three-phase AC conversion without additional hardware. This ensures both the stability of conventional power supply and the reliability of emergency power supply, achieving a balance between power supply scenario flexibility and system operational stability.

[0073] Figure 3 A schematic diagram of another power supply module provided in an embodiment of this application. See also... Figure 3 Based on the above embodiments, the energy storage module 30 in any power supply module 1 includes a first energy storage unit C1 and a second energy storage unit C2; the power factor correction module 20 also includes a first diode D1 and a second diode D2.

[0074] Wherein, the first diode D1 is connected in series between the first terminal of the first transistor Q1 and the first connection terminal of the first energy storage unit C1; the second diode D2 is connected in series between the second connection terminal of the first energy storage unit C1 and the second terminal of the second transistor Q2; the second terminal of the first transistor Q1, the first terminal of the second transistor Q2, the second connection terminal of the first energy storage unit C1 and the first connection terminal of the second energy storage unit C2 are all connected to point N, and point N serves as the third connection terminal of the energy storage module 30.

[0075] In this embodiment, the first energy storage unit C1 and the second energy storage unit C2 are connected in series, and both contain at least one capacitor to achieve the function of energy storage. It should be noted that when the first energy storage unit C1 or the second energy storage unit C2 contains multiple capacitors, the multiple capacitors can be flexibly connected in series or in parallel. The specific connection form can be adapted according to the actual energy storage capacity and voltage level requirements, and this embodiment does not limit this.

[0076] It should be further explained that the first diode D1 is connected in series between the first terminal of the first transistor Q1 and the first connection terminal of the first energy storage unit C1, and the second diode D2 is connected in series between the second connection terminal of the second energy storage unit C2 and the second terminal of the second transistor Q2. Based on the unidirectional conductivity of these two diodes, reverse current flow can be effectively prevented. Thus, when the transistor is switching or when voltage / current fluctuations occur in the load, the stored energy in the energy storage unit is prevented from being discharged back into the front-end circuit of the power factor correction module. This ensures the unidirectional transfer of energy from the power factor correction module 20 to the energy storage module 30, while preventing reverse current from impacting the front-end components, thereby improving the stability of the energy conversion process.

[0077] Based on the above, the second terminal of the first transistor Q1, the first terminal of the second transistor Q2, the second connection terminal of the first energy storage unit C1, and the first connection terminal of the second energy storage unit C2 all converge at point N. Point N also serves as the third connection terminal of the energy storage module 30, continuing the connection to the neutral terminal of the AC power supply. This allows the two energy storage units to independently store electrical energy while also achieving potential correlation through point N. Combined with the coordinated operation of the diodes and transistors, this results in more comprehensive energy buffering and regulation.

[0078] Specifically, when the power factor correction module 20 outputs electrical energy, the first diode D1 and the second diode D2 can selectively conduct according to the voltage direction to ensure that electrical energy is efficiently injected into the first energy storage unit C1; while the second energy storage unit C2, through its connection with point N, can achieve potential balance with the neutral terminal of the AC power supply, and further improve the adaptability of the energy storage module 30 in AC and DC power supply modes, so as to continuously provide a stable power input to the inverter module 40.

[0079] In summary, the energy storage module 30, through the combined design of the first energy storage unit C1 and the second energy storage unit C2, combined with the newly added first diode D1 and second diode D2 in the power factor correction module 20, can form a more reliable energy storage and transmission path, further optimizing the reliability of the power factor correction module 20 in energy conversion, and providing a more solid guarantee for the stable operation of the entire power supply module 1.

[0080] Figure 4A schematic diagram of another power supply module provided in an embodiment of this application. See also... Figure 4 Based on the above embodiments, any power supply module 1 further includes a control module 50, which is connected to the switching module 10, the power factor correction module 20 and the inverter module 40 respectively.

[0081] The control module 50 is used to control the uninterruptible power supply 100 to be in a first power supply state when the AC power supply fails.

[0082] The control module 50 is used to control the uninterruptible power supply 100 to be in a second power supply state when the AC power supply is normal; the second power supply state is that the three switching modules 10 respectively provide the three-phase AC power supply signals of the AC power supply to the connected power factor correction module 20.

[0083] In this embodiment, the newly added control module 50 of the power supply module 1 is connected to the switching module 10, the power factor correction module 20 and the inverter module 40 respectively, and can monitor the operating status of the AC power supply in real time, and automatically switch the working mode of the uninterruptible power supply 100 according to whether the power supply is normal.

[0084] Specifically, the control module 50 may be composed of switching devices such as half-controlled switches and full-controlled switches, and the operating states of the power factor correction module 20, the inverter module 40 and the switching module 10 can all be achieved by adjusting the operating states of these devices (such as half-controlled switches and full-controlled switches).

[0085] Specifically, when an AC power failure (such as power outage, abnormal voltage, etc.) is detected, the control module 50 will quickly issue a control command to drive all switching modules 10 to switch to the DC power input channel, so that the uninterruptible power supply 100 enters the first power supply state. At this time, the power factor correction module 20 works in a synchronous sequence to ensure that DC power is efficiently converted and supplied to the load, ensuring uninterrupted power supply.

[0086] Optionally, during normal AC power supply operation, the control module 50 controls the uninterruptible power supply 100 to be in a second power supply state, that is, instructs the three switching modules 10 to connect the three-phase AC signals of the AC power supply to the corresponding power factor correction modules 20. In this state, the control module 50 can coordinate the independent operation of each power factor correction module 20 according to parameters such as the phase and frequency of the three-phase AC signals, accurately adapting to the AC input of the corresponding phase, and simultaneously regulating the output of the inverter module 40 to ensure that the three-phase voltage is balanced and meets the load requirements.

[0087] In the uninterruptible power supply 100, the control module 50 controls the state switching, which not only achieves a seamless transition between normal and fault states, but also further improves the reliability of the uninterruptible power supply 100.

[0088] It should be noted that when the control module 50 controls the uninterruptible power supply 100 to switch power supply states, whether switching from the first power supply state to the second power supply state or from the second power supply state to the first power supply state, the two transistors in the uninterruptible power supply 100 can be turned off before the switch, that is, the power factor correction module 20 is controlled to be in a waveform blocking state; after the control module 50 completes the power supply state switch, the two transistors are turned on / off controlled according to the operating requirements of the corresponding power supply state, that is, the power factor correction module 20 is controlled to generate waveforms.

[0089] This control logic of first blocking the wave, then switching, and finally transmitting the wave can effectively avoid the current surge caused by the instantaneous switching of transistors during the switching process, ensuring the smoothness of the state switching and further improving the safety and reliability of the system operation.

[0090] Figure 5 A schematic diagram of another power supply module provided in an embodiment of this application. See also... Figure 5 Based on the above embodiments, the switching module 10 in any power supply module 1 includes a first switching unit 11 and a second switching unit 12; the first input terminal of the first switching unit 11 and the first input terminal of the second switching unit 12 are both connected to the control module 50; the second input terminal of the first switching unit 11 is connected to the DC power supply, the first input terminal of the first switching unit 11 is connected to the first terminal of the first inductor L1, and the second output terminal of the first switching unit 11 is connected to the first terminal of the second inductor L2; the second input terminal of the second switching unit 12 is connected to the AC power supply, the first input terminal of the second switching unit 12 is connected to the first terminal of the first inductor L1, and the second output terminal of the second switching unit 12 is connected to the first terminal of the second inductor L2.

[0091] When the first switching unit 11 is turned on and the second switching unit 12 is turned off, the uninterruptible power supply 100 is in the first power supply state; when the second switching unit 12 is turned on and the first switching unit 11 is turned off, the uninterruptible power supply 100 is in the second power supply state.

[0092] In this embodiment, by setting up independent first switching unit 11 and second switching unit 12, the switching control between AC power supply and DC power supply can be realized.

[0093] Specifically, the first input terminals of both the first switching unit 11 and the second switching unit 12 are connected to the control module 50, enabling them to receive commands from the control module 50 in real time and precisely switch their on or off states, providing a direct control basis for power supply state switching. Furthermore, their first output terminals are connected to the first terminal of the first inductor L1, and their second output terminals are connected to the first terminal of the second inductor L2. This ensures that regardless of whether the first switching unit 11 or the second switching unit 12 is in the on state, the DC or AC power signal input to it can be stably transmitted to the first inductor L1 and the second inductor L2 through their respective output terminals, thus providing a continuous and stable input signal for the subsequent processing of the power factor correction module 20.

[0094] Based on the above implementation, when the control module 50 detects an AC power failure, it controls the first switching unit 11 to turn on and the second switching unit 12 to turn off. At this time, DC power is connected through the second input terminal of the first switching unit 11 and transmitted to the first inductor L1 and the second inductor L2 through its output terminal, driving the uninterruptible power supply 100 into the first power supply state. When the control module 50 detects that the AC power is normal, it controls the second switching unit 12 to turn on and the first switching unit 11 to turn off. At this time, AC power is connected through the second input terminal of the second switching unit 12 and transmitted to the inductors, causing the system to switch to the second power supply state.

[0095] The aforementioned mutually exclusive switching control logic avoids cross-interference between the two power supply signals, thereby ensuring the reliability and stability of power supply state switching. Simultaneously, the independent switching unit simplifies the drive logic of the control module 50, enabling rapid response through hardware circuitry and providing a reliable circuit foundation for seamless transition between the two power supply modes.

[0096] Figure 6 A schematic diagram of another power supply module provided in an embodiment of this application. See also... Figure 6 Based on the above embodiments, the DC power supply includes a positive power supply terminal and a negative power supply terminal; the first switching unit 11 in any switching module 10 includes a first switch S1 and a second switch S2, and the second switching unit 12 includes a third switch S3 and a fourth switch S4.

[0097] Wherein, the first switch S1 is connected in series between the positive terminal of the power supply and the first terminal of the first inductor L1; the second switch S2 is connected in series between the negative terminal of the power supply and the first terminal of the second inductor L2; the third switch S3 and the fourth switch S4 are both connected to the output terminal of the AC power supply; the output terminal of the third switch S3 is connected to the first terminal of the first inductor L1; and the output terminal of the fourth switch S4 is connected to the first terminal of the second inductor.

[0098] In this embodiment, the first switching unit and the second switching unit achieve precise control of the power input through specific switching devices, further refining the circuit logic of the switching module.

[0099] Specifically, the first switch S1 and the second switch S2 of the first switching unit 11 are connected in series between the positive terminal of the DC power supply and the first end of the first inductor L1, and between the negative terminal of the DC power supply and the first end of the second inductor L2, respectively, forming a current path for the DC power supply. The third switch S3 and the fourth switch S4 of the second switching unit 12 are both connected to the output terminal of the AC power supply, and their output terminals are respectively connected to the first end of the first inductor L1 and the first end of the second inductor L2, forming a current path for the AC power supply input.

[0100] Based on this, when the uninterruptible power supply 100 needs to be in the first power supply state, the control module 50 will control the first switch S1 and the second switch S2 to be turned on, while simultaneously turning off the third switch S3 and the fourth switch S4. At this time, the positive terminal of the DC power supply is connected to the first inductor L1 via the first switch S1, and the negative terminal is connected to the second inductor L2 via the second switch S2, so that the DC power can be stably transmitted to the power factor correction module 20. In the second power supply state, the control module 50 instructs the third switch S3 and the fourth switch S4 to be turned on, and the first switch S1 and the second switch S2 to be turned off. The AC power supply is connected to the first inductor L1 and the second inductor L2 via the third switch S3 and the fourth switch S4, respectively, to ensure that the AC power signal is stably transmitted to the power factor correction module 20.

[0101] Based on the above implementation, the inverter module 40 of each power supply module 1 in this embodiment has a high degree of flexibility in circuit design. It can use the same inverter circuit, such as uniformly using a three-phase full-bridge inverter topology, or it can select different types of inverter circuits according to load characteristics, power level and control accuracy requirements. For example, the topology types that can be used include, but are not limited to, the three-phase bridge inverter circuit and the half-bridge inverter circuit in the three-type inverter circuit.

[0102] Specifically, when using the same circuit, standardized design can simplify R&D and production, reduce costs, and ensure the consistency of three-phase output to adapt to scenarios with high power supply symmetry requirements. When using different circuits, different configurations can be made for the load requirements of each phase. For example, a bridge topology with freewheeling diodes can be configured for high-power impulse loads, and a multi-level topology can be selected for loads with high waveform quality requirements. This maximizes energy conversion efficiency and reduces costs while ensuring system stability.

[0103] Based on the above embodiments, the uninterruptible power supply 100 provided in this application may also include a charging circuit. The input terminal of the charging circuit is connected to the first energy storage unit C1 and the second energy storage unit C2 respectively, and the output terminal is connected to a DC power supply (such as a battery pack). This allows the electrical energy stored in the first energy storage unit C1 and the second energy storage unit C2 to be converted into a voltage level suitable for the DC power supply when the AC power supply is normal, thereby replenishing the energy of the DC power supply and ensuring that the DC power supply is always in a fully charged standby state, thus improving the reliability of the uninterruptible power supply 100 during emergency switching.

[0104] In some scenarios, the charging circuit may include: a buck chopper unit, a filter unit, and a voltage detection and control unit.

[0105] Specifically, the buck chopper unit, as the core conversion component, can reduce the high-voltage DC output from the first energy storage unit C1 and the second energy storage unit C2 to the charging voltage required by the DC power supply by turning on and off the switching transistor (such as MOSFET); the filter unit, composed of inductors and capacitors, is used to filter out the ripple generated during the bucking process, making the output voltage smoother and more stable; the voltage detection and control unit monitors the current voltage of the DC power supply and the output voltage of the first energy storage unit C1 and the second energy storage unit C2 in real time, and precisely controls the charging current and voltage by adjusting the duty cycle of the high-frequency switching transistor through feedback, avoiding overcharging or undercharging, and ensuring the safety and efficiency of the charging process.

[0106] The circuit structure described above not only makes full use of the surplus electrical energy during normal AC operation to charge the DC power supply, but also achieves precise control of charging parameters through the coordinated operation of multiple units, further optimizing the energy management effect of the uninterruptible power supply 100.

[0107] Next, based on the circuit structure of each module, we will introduce the power supply modes of the uninterruptible power supply in detail from two aspects: the second power supply state with normal AC operation and the first power supply state with AC failure, and explain the working situation of each module in different modes.

[0108] Optionally, when the uninterruptible power supply 100 is in the first power supply state: when the inverter module 40 is operating in the positive half-cycle, the first transistor Q1 is turned on at a preset frequency, and the second transistor Q2 remains on; when the inverter module 40 is operating in the negative half-cycle, the second transistor Q2 is turned on at a preset frequency, and the first transistor Q1 remains on.

[0109] This can be explained by the fact that, regardless of whether it's the first transistor Q1 or the second transistor Q2, a high-level state indicates that the transistor is turned on. Similarly, a low-level state indicates that the transistor is turned off.

[0110] Since DC power supply itself does not distinguish between positive and negative half cycles, in order to avoid imbalance in the power signal output to the load, the working cycle of the power factor correction module 20 can be precisely matched with the positive and negative half cycle operating status of the inverter module 40 by monitoring it.

[0111] Specifically, when the uninterruptible power supply 100 is in the first power supply state and the inverter module 40 is operating in the positive half-cycle, the first transistor Q1 alternately turns on and off at a preset frequency (such as a high-frequency switching frequency), while the second transistor Q2 remains continuously on. At this time, after the DC power supply is connected through the first switch S1 and the second switch S2, the energy input to the energy storage module 30 can be precisely adjusted by the high-frequency switching of the first transistor Q1 in conjunction with components such as the first inductor L1 and the first rectifier bridge REC1. At the same time, the continuous conduction of the second transistor Q2 provides a stable current path for the inverter output in the positive half-cycle, ensuring that the electrical energy delivered by the energy storage module 30 to the inverter module 40 is adapted to the voltage requirements of the positive half-cycle.

[0112] Optionally, when the inverter module 40 switches to the negative half-cycle operation, the control logic is adjusted accordingly so that the second transistor Q2 is turned on at a preset frequency, while the first transistor Q1 remains continuously turned on. This allows the second transistor Q2 to perform energy regulation during high-frequency switching, working with the second inductor L2 and the second rectifier bridge REC2 to complete the power factor correction during the negative half-cycle, while the continuous conduction of the first transistor Q1 provides a path for current transmission during the negative half-cycle, ensuring that the electrical energy output by the energy storage module 30 matches the voltage characteristics of the inverter module 40 during the negative half-cycle.

[0113] The above implementation method, through a transistor control strategy synchronized with the inverter cycle, can not only efficiently complete the DC to AC conversion in the first power supply state, but also optimize energy transmission efficiency and reduce conversion losses through the combination of high-frequency switching and continuous conduction, thereby further improving the stability and energy efficiency of the uninterruptible power supply in emergency power supply mode.

[0114] Optionally, when the uninterruptible power supply 100 is in the second power supply state, for any power supply module 1, when the input power signal is in the positive half-cycle, the first transistor Q1 is turned on at a preset frequency and the second transistor Q2 remains off; when the input power signal is in the negative half-cycle, the second transistor Q2 is turned on at a preset frequency and the first transistor Q1 remains off; the input power signal is a phase power signal of the AC power supply connected to the corresponding power supply module 1.

[0115] In this embodiment, the uninterruptible power supply 100 of this application includes three control modules 50, and each control module 50 is connected to an AC power signal of a different phase. Based on this, when AC power is used, for any power supply module 1, when the corresponding phase AC power signal is in the positive half-cycle, the first transistor Q1 alternately turns on and off at a preset frequency (such as a high-frequency switching frequency), while the second transistor Q2 remains off. At this time, the positive half-cycle AC signal is transmitted to the first inductor L1 via the third switch S3. Through the high-frequency switching of the first transistor Q1 in conjunction with the first rectifier bridge REC1, efficient power factor correction of the positive half-cycle energy is achieved, and the electrical energy is accurately stored in the energy storage module 30. Simultaneously, the off of the second transistor Q2 avoids interference from the negative half-cycle circuit, ensuring the independence and stability of the positive half-cycle energy conversion.

[0116] Optionally, when the input AC power signal is in the negative half-cycle, the control logic switches to the second transistor Q2 being turned on at a preset high frequency, while the first transistor Q1 remains off. At this time, the negative half-cycle AC signal is connected to the second inductor L2 via the fourth switch S4. Through the high-frequency switching action of the second transistor Q2 in conjunction with the second rectifier bridge REC2, the power factor correction and storage of the negative half-cycle energy are completed. The turn-off of the first transistor Q1 isolates the influence of the positive half-cycle circuit, ensuring the independence and stability of the positive and negative half-cycle energy conversion.

[0117] The control method described above, which uses alternating switches synchronized with the half-cycle of the AC signal, enables the power factor correction module 20 to specifically handle the positive and negative half-cycles of electrical energy. This not only adapts to the periodic characteristics of the AC power supply but also reduces mutual interference between components through the time-sharing operation of the transistors. As a result, the efficiency and accuracy of power factor correction under the second power supply state can be improved, providing a more stable AC input for three-phase loads.

[0118] Based on the above implementation method, when the uninterruptible power supply 100 is in the first power supply state, the three power factor correction modules 20 work synchronously in the same timing sequence.

[0119] Optionally, when powered by a DC power supply, i.e., continuously in the first power supply state, the switching modules 10 in the three power supply modules 1 all switch to DC power input. At this time, the power factor correction modules 20 in the three power supply modules 1 operate synchronously with completely consistent timing. In this way, after the DC power signal enters each power factor correction module 20 through each switching module 10, the power factor correction module 20 performs boost conversion according to the same high-frequency switching logic, synchronously charging its respective energy storage module 30. When the electrical energy of the energy storage module 30 is inverted into AC power by the inverter module 40, the synchronous control of the preceding power factor correction module 20 ensures the phase consistency and voltage stability of the three-phase output, ultimately achieving a reliable three-phase AC power supply for the load.

[0120] Based on the above implementation method, when the uninterruptible power supply 100 is operating in the first power supply state, the inverter modules 40 of each power supply module 1 operate synchronously with the same power frequency cycle.

[0121] In this embodiment, when the uninterruptible power supply 100 is in its first power supply state, i.e., all switching modules 10 are connected to DC power, the inverter modules 40 of each power supply module 1 will operate synchronously according to a completely consistent power frequency cycle. For example, the power frequency cycle is typically 50Hz or 60Hz. Thus, when the three inverter modules 40 convert the DC power output from the energy storage module 30 into AC power, not only are the frequency and phase of the output voltage completely consistent, but the waveform changes (such as zero-crossing points and peak points) within each cycle are also precisely synchronized. This ensures that the phase difference of the three-phase AC power ultimately output by the three power supply modules 1 is strictly maintained at 120°, meeting the phase requirements of a three-phase load and avoiding three-phase voltage imbalance caused by asynchronous operation of the inverter modules 40, thereby ensuring stable operation of the load even in DC power supply mode.

[0122] Figure 7 This is a schematic diagram of a power supply system provided in an embodiment of this application. See also... Figure 7 This application also provides a power supply system A, including a load 200 and an uninterruptible power supply 100 provided in any embodiment of this application.

[0123] In this embodiment, the power supply system A is connected to the uninterruptible power supply 100 provided in any embodiment of this application through the load 200, forming a complete closed loop from electrical energy conversion to terminal power supply. Among them, the uninterruptible power supply 100 is the core power supply equipment, and the inverter modules 40 of its three power supply modules 1 are respectively connected to the three-phase input terminals of the load 200, which can dynamically adjust the output electrical energy according to the power consumption characteristics of the load 200.

[0124] Specifically, when the load 200 is in normal operation and the AC power supply is normal, the uninterruptible power supply 100 operates in the second power supply state. The three power supply modules 1 respectively process the corresponding phase signals of the three-phase AC power supply. After power factor correction, energy storage and inversion, they output stable and phase-balanced three-phase AC power to the load 200 to meet the normal power demand of the load 200.

[0125] Optionally, if the AC power supply fails, the uninterruptible power supply 100 quickly switches to the first power supply state and continues to supply power to the load 200 by relying on the DC power supply. At this time, the three inverter modules 40 work synchronously, and the output three-phase AC power still maintains a 120° phase difference, ensuring that the load 200 can also operate stably in emergency situations.

[0126] The above-described implementation method, through the direct connection between the uninterruptible power supply 100 and the load 200, can fully utilize the dual power supply capability of the uninterruptible power supply 100, so as to not only adapt to the conventional three-phase power demand of the load, but also ensure uninterrupted power supply to the load when the power supply is abnormal, thus significantly improving the reliability of the entire power supply system A.

[0127] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0128] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. An uninterruptible power supply, characterized in that, include: Three power supply modules; Any of the power supply modules includes: a switching module, a power factor correction module, an energy storage module, and an inverter module; wherein, the first input terminals of the three switching modules are respectively connected to the three-phase AC power signal of the AC power supply, and the second input terminals of the three switching modules are all connected to the same DC power signal; In any power supply module, the switching module is connected to the power factor correction module; the power factor correction module is connected to the energy storage module. The energy storage module is connected to the inverter module, and the inverter module is connected to the load; in, The power factor correction module includes: a first inductor, a second inductor, a first rectifier bridge, a second rectifier bridge, a first transistor, and a second transistor; wherein, The first end of the first inductor is connected to the first output end of the switching module, and the second end of the first inductor is connected to the first end of the first rectifier bridge and the third end of the first rectifier bridge, respectively. The first end of the second inductor is connected to the second output end of the switching module, and the second end of the second inductor is connected to the first end and the third end of the second rectifier bridge, respectively. The second end of the first rectifier bridge is connected to the second end of the second rectifier bridge, and the fourth end of the first rectifier bridge is connected to the fourth end of the second rectifier bridge. The second end of the first rectifier bridge is also connected to the first end of the first transistor and the first connection end of the energy storage module; The second end of the second rectifier bridge is also connected to the second end of the second transistor and the second connection end of the energy storage module; The second terminal of the first transistor and the first terminal of the second transistor are both connected to the third connection terminal of the energy storage module, and the third connection terminal of the energy storage module is also connected to the neutral terminal of the AC power supply.

2. The uninterruptible power supply according to claim 1, characterized in that, The energy storage module includes a first energy storage unit and a second energy storage unit; the power factor correction module further includes a first diode and a second diode; wherein... The first diode is connected in series between the first terminal of the first transistor and the first connection terminal of the first energy storage unit; The second diode is connected in series between the second connection terminal of the second energy storage unit and the second terminal of the second transistor; The second terminal of the first transistor, the first terminal of the second transistor, the second connection terminal of the first energy storage unit, and the first connection terminal of the second energy storage unit are all connected to point N, which serves as the third connection terminal of the energy storage module.

3. The uninterruptible power supply according to claim 1 or 2, characterized in that, The power supply module further includes: a control module, which is connected to the switching module, the power factor correction module, and the inverter module, respectively; wherein... The control module is used to control the uninterruptible power supply to be in a first power supply state when the AC power supply fails; the first power supply state is that all three switching modules provide DC power to the connected power factor correction module; The control module is used to control the uninterruptible power supply to be in a second power supply state when the AC power supply is normal; the second power supply state is that the three switching modules respectively provide the three-phase AC power supply signals of the AC power supply to the connected power factor correction module.

4. The uninterruptible power supply according to claim 3, characterized in that, When the uninterruptible power supply is in the first power supply state: When the inverter module is operating in the positive half-cycle, the first transistor is turned on at a preset frequency, and the second transistor remains turned on. When the inverter module operates in the negative half-cycle, the second transistor is turned on at a preset frequency, while the first transistor remains on.

5. The uninterruptible power supply according to claim 4, characterized in that, When the uninterruptible power supply is in the second power supply state For any power supply module, when the input power signal is in the positive half-cycle, the first transistor is turned on at a preset frequency and the second transistor remains off; when the input power signal is in the negative half-cycle, the second transistor is turned on at a preset frequency and the first transistor remains off; the input power signal is one phase of the AC power supply connected to the corresponding power supply module.

6. The uninterruptible power supply according to claim 1, characterized in that, The switching module includes a first switching unit and a second switching unit; Both the first input terminal of the first switching unit and the first input terminal of the second switching unit are connected to the control module; The second input terminal of the first switching unit is connected to the DC power supply, the first input terminal of the first switching unit is connected to the first terminal of the first inductor, and the second output terminal of the first switching unit is connected to the first terminal of the second inductor. The second input terminal of the second switching unit is connected to the AC power supply, the first input terminal of the second switching unit is connected to the first terminal of the first inductor, and the second output terminal of the second switching unit is connected to the first terminal of the second inductor. in, When the first switching unit is turned on and the second switching unit is turned off, the uninterruptible power supply is in the first power supply state. When the second switching unit is turned on and the first switching unit is turned off, the uninterruptible power supply is in the second power supply state.

7. The uninterruptible power supply according to claim 6, characterized in that, The DC power supply includes a positive terminal and a negative terminal; the first switching unit includes a first switch and a second switch, and the second switching unit includes a third switch and a fourth switch; wherein... The first switch is connected in series between the positive terminal of the power supply and the first terminal of the first inductor; the second switch is connected in series between the negative terminal of the power supply and the first terminal of the second inductor. Both the third switch and the fourth switch are connected to the output terminal of the AC power supply; the output terminal of the third switch is connected to the first terminal of the first inductor; and the output terminal of the fourth switch is connected to the first terminal of the second inductor.

8. The uninterruptible power supply according to claim 1, characterized in that, When the uninterruptible power supply is in the first power supply state, the three power factor correction modules operate synchronously with the same timing sequence.

9. The uninterruptible power supply according to claim 1, characterized in that, When the uninterruptible power supply is operating in the first power supply state, the inverter modules of each power supply module operate synchronously with the same power frequency cycle.

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