AC / DC switching power supply circuit

Abstract

The utility model provides a kind of AC-DC switching power supply circuit, comprising: first switching unit, with the output end of alternating current power supply is connected, at least for in alternating current power supply to server power supply;First conversion module, the input end of first conversion module is connected with first switching unit, output end is electrically connected with server, output end is used to power supply for server;Second conversion module, the input end of second conversion module is connected with first switching unit, output end is electrically connected with power supply module;Second switching unit, the first end of second switching unit is connected with first switching unit and first conversion module respectively, the second end of second switching unit is electrically connected with power supply module, second switching unit is used to make power supply module to server power supply when alternating current power supply failure, solve the inconvenient maintenance of the power supply system of data center in prior art.

Description

Technical Field

[0001] This utility model relates to the field of power electronics technology, and more specifically, to an AC / DC switching power supply circuit. Background Technology

[0002] The current power supply architecture of data centers mainly connects batteries to the output busbar. During normal operation, the system uses an AC-DC (Alternating Current to Direct Current) modular switching power supply to power the Internet Data Center (IDC) (which is equivalent to the load) and the batteries. When AC power fails, the batteries can take over the power supply to ensure the reliable operation of IDC equipment. However, this architecture is not conducive to fine-grained maintenance due to the large capacity of the busbar batteries. Furthermore, in practical application scenarios, there is a risk of burning out the equipment when a single power supply device fails, resulting in poor reliability.

[0003] The information disclosed above in the background section is only intended to enhance the understanding of the background art of the art described herein. Therefore, the background art may contain certain information that does not constitute prior art known to those skilled in the art in this country. Utility Model Content

[0004] The main objective of this invention is to provide an AC / DC switching power supply circuit to at least solve the problem of inconvenient maintenance of power supply systems in data centers in the prior art.

[0005] To achieve the above objectives, according to one aspect of the present invention, an AC / DC switching power supply circuit is provided, comprising: a first switching unit connected to the output terminal of an AC power source, at least for supplying power to a server from the AC power source; a first conversion module, the input terminal of the first conversion module being connected to the first switching unit, and the output terminal being electrically connected to the server, the output terminal being used to supply power to the server; a second conversion module, the input terminal of the second conversion module being connected to the first switching unit, and the output terminal being electrically connected to a power supply module; and a second switching unit, the first terminal of the second switching unit being connected to both the first switching unit and the first conversion module, and the second terminal of the second switching unit being electrically connected to the power supply module, the second switching unit being used to enable the power supply module to supply power to the server when the AC power source fails.

[0006] Optionally, the first conversion module includes multiple first boost power factor correction circuits and multiple first resonant circuits, wherein the multiple first boost power factor correction circuits are connected in parallel, the multiple first resonant circuits are connected in parallel, and the parallel branches of the multiple first boost power factor correction circuits and the parallel branches of the multiple first resonant circuits are connected in series.

[0007] Optionally, the second conversion module includes a second boost power factor correction circuit and a second resonant circuit, wherein the input terminal of the second boost power factor correction circuit is connected to the first switching unit, the output terminal is electrically connected to the input terminal of the second resonant circuit, and the output terminal of the second resonant circuit is electrically connected to the power supply module.

[0008] Optionally, the AC / DC switching power supply circuit further includes an auxiliary module. The first end of the auxiliary module is electrically connected to the AC power source, and the second end of the auxiliary module is electrically connected to the power supply module. The auxiliary module is used to enable the power supply module to supply power to the server when the AC power source fails.

[0009] Optionally, the boost power factor correction circuit is a three-phase AC input circuit, which includes a first inductor, a second inductor, and a third inductor. The input terminals of the first inductor, the second inductor, and the third inductor are all connected to the AC power supply through the first switching unit. The output terminals of the first inductor, the second inductor, and the third inductor are all connected to a first switch, a first capacitor, and a second switch in sequence.

[0010] Optionally, the resonant circuit includes: a switching network module, a resonant network module, and a rectifier-filter network module, wherein the switching network module is connected in parallel across the capacitor, the resonant network module is electrically connected to the switching network module, and the rectifier-filter network module is electrically connected to the resonant network module.

[0011] Optionally, the switch network module includes multiple parallel first branches, each first branch including two series-connected switch modules. Each switch module includes a switch device, a first unidirectional conducting device, and a second capacitor. The switch device is connected in parallel with the first unidirectional conducting device and the second capacitor, respectively.

[0012] Optionally, the resonant network module includes multiple second branches, each of which is electrically connected to the first branch in a corresponding manner. The connection point between the second branch and the first branch is located between the two switching modules. Each second branch includes a third capacitor and a fourth inductor connected in series.

[0013] Optionally, the rectifier filter network module includes multiple third branches and multiple transformers. Each third branch includes two second unidirectional conducting devices connected in series. The multiple third branches are connected in parallel with a fourth capacitor. The first terminals of the multiple transformers are electrically connected to the third branches one by one, and the connection points are located between the two second unidirectional conducting devices. The second terminals of the multiple transformers are interconnected. The third terminals of the multiple transformers are interconnected. The fourth terminals of the multiple transformers are electrically connected to the multiple fourth inductors one by one.

[0014] Optionally, the first switching unit and the second switching unit include at least one of the following: a relay, a MOSFET, a thyristor, and a transistor.

[0015] The AC / DC switching power supply circuit of this utility model includes: a first switching unit, a second switching unit, a first conversion module, and a second conversion module. Under normal AC power conditions, the first switching unit connects the AC power supply to the first conversion module to power the server, and simultaneously connects the AC power supply to the second conversion module to power the power supply module, which stores electrical energy. In the event of an AC power failure, the first switching unit disconnects the AC power supply from both the first and second switching units, and the second switching unit connects the power supply module to the first conversion module to replace the AC power supply and continue powering the server. In the event of an AC power failure, the power supply module can quickly take over the server's power supply, avoiding the risk of server data interruption and hardware damage. Furthermore, because the charging and discharging paths of the power supply module are independent, the power efficiency and reliability of the data center during normal operation are improved, facilitating future maintenance and management. By separating the power supply module from the server and applying it as a separate module in the power supply circuit, the structure is simplified, and the power supply module is easy to inspect and replace, thus solving the problem of inconvenient maintenance in existing data center power supply systems. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0017] Figure 1 A schematic diagram of the structure of a first AC / DC switching power supply circuit according to an embodiment of the present invention is shown;

[0018] Figure 2 A schematic diagram of a second AC / DC switching power supply circuit according to an embodiment of the present invention is shown;

[0019] Figure 3A schematic diagram of a third AC / DC switching power supply circuit according to an embodiment of the present invention is shown;

[0020] Figure 4 A schematic diagram of the structure of an auxiliary module according to an embodiment of the present invention is shown;

[0021] Figure 5 A schematic diagram of the structure of a power conversion unit of an auxiliary module according to an embodiment of the present invention is shown;

[0022] Figure 6 A schematic diagram of a boost power factor correction circuit according to an embodiment of the present invention is shown;

[0023] Figure 7 A schematic diagram of another boost-type power factor correction circuit structure according to an embodiment of the present invention is shown;

[0024] Figure 8 A schematic diagram of a resonant circuit structure according to an embodiment of the present invention is shown.

[0025] The above figures include the following reference numerals:

[0026] 10. First switching unit; 20. AC power supply; 30. Server; 40. First conversion module; 41. First boost power factor correction circuit; 42. First resonant circuit; 50. Second conversion module; 51. Second boost power factor correction circuit; 52. Second resonant circuit; 60. Power supply module; 70. Second switching unit; 80. Auxiliary module; 91. First inductor; 92. Second inductor; 93. Third inductor; 94. First switch; 95. First capacitor; 96. Second switch; 101. Switch network module; 102. Resonant network module; 103. Rectifier and filter network module; 104. Switch module. Detailed Implementation

[0027] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0028] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0029] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of the utility model described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0030] As described in the background section, the current power supply architecture of existing data centers mainly connects the battery to the output busbar. During normal operation, the IDC load and battery are powered by the AC-DC modular switching power supply on the system. When AC power fails, the battery can take over the power supply to ensure the reliable operation of the IDC equipment. However, this architecture is not convenient for fine-grained maintenance due to the large capacity of the busbar battery. In practical application scenarios, there is a risk of burning out the equipment when a single power supply device fails, resulting in poor reliability. To solve the problem of inconvenient maintenance of the power supply system of existing data centers, the embodiments of this application provide an AC-DC switching power supply circuit.

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0032] According to one embodiment of the present invention, an AC / DC switching power supply circuit is provided, such as... Figure 1 and Figure 2 As shown, it includes: a first switching unit 10, connected to the output terminal of AC power supply 20, for at least supplying power from AC power supply 20 to server 30; a first conversion module 40, the input terminal of the first conversion module 40 is connected to the first switching unit 10, and the output terminal is electrically connected to server 30, the output terminal being used to supply power to server 30; a second conversion module 50, the input terminal of the second conversion module 50 is connected to the first switching unit 10, and the output terminal is electrically connected to power supply module 60; a second switching unit 70, the first terminal of the second switching unit 70 is connected to both the first switching unit 10 and the first conversion module 40, and the second terminal of the second switching unit 70 is electrically connected to power supply module 60, the second switching unit 70 being used to enable power supply module 60 to supply power to server 30 when AC power supply 20 fails.

[0033] The AC / DC switching power supply circuit includes a first switching unit, a second switching unit, a first conversion module, and a second conversion module. Under normal AC power conditions, the first switching unit connects the AC power supply to the first conversion module to power the server, and simultaneously connects the AC power supply to the second conversion module to power the power supply module, which stores electrical energy. In the event of an AC power failure, the first switching unit disconnects the AC power supply from both itself and the second switching unit, and the second switching unit connects the power supply module to the first conversion module to continue powering the server. In the event of an AC power failure, the power supply module can quickly take over the server's power supply, avoiding the risk of data interruption and hardware damage. Furthermore, because the power supply module has independent charging and discharging paths and is not directly connected to the system busbar, it is easier to maintain and manage in the future compared to having the power supply module attached to the server, solving the problem of inconvenient maintenance in existing data center power supply systems.

[0034] In the above embodiments, the first switching unit can be a switching device based on a DC relay or a MOSFET, and its function is to monitor the status of the AC power supply. When the AC power supply is normal, the first switching unit will engage, allowing the AC power supply to be converted into stable DC power through the boost PFC (Boost Power Factor Correction) module, thereby powering the server. This design ensures that the server can obtain a stable power supply when the AC power supply is operating normally, while reducing the impact of current fluctuations that may be caused by direct connection to the AC power supply on the server.

[0035] In the above embodiments, the first conversion module can convert AC power to DC power, and then convert the DC power to stable DC power suitable for server use, thereby improving power efficiency and reducing grid losses. This not only improves circuit efficiency but also increases the flexibility and maintainability of the AC / DC switching power supply circuit in the data center.

[0036] In the above embodiment, the second conversion module can convert AC power to DC power to charge the power supply module (which can be a battery) when the AC power supply is normal. This independent charging path design ensures that the power supply module is fully charged when the AC power is normal, while avoiding interference with the server power supply path, thus improving the safety and stability of the entire circuit.

[0037] In the above embodiments, the second switching unit can connect the power supply module (such as a battery) to the server's power supply path in the event of an AC power failure. When an AC power failure occurs, the second switching unit is triggered, disconnecting the connection between the first conversion module and the AC power source, and simultaneously closing the power supply path between the power supply module and the server, ensuring that the server still receives uninterrupted power supply when AC power is lost. This not only ensures the reliability of the server in the face of sudden power failures, but also facilitates the maintenance of the power supply module and reduces the risk of data loss and hardware damage.

[0038] In some alternative implementations, such as Figure 2 As shown, the first conversion module includes multiple first boost power factor correction circuits 41 and multiple first resonant circuits 42. The multiple first boost power factor correction circuits 41 are connected in parallel, the multiple first resonant circuits 42 are connected in parallel, and the parallel branches of the multiple first boost power factor correction circuits 41 and the multiple first resonant circuits 42 are connected in series. This parallel design of the multiple first boost power factor correction circuits 41 (boost PFC) in the first conversion module 40 enhances the overall power handling capacity of the circuit, improving the system's load adaptability and power supply efficiency. The first boost power factor correction circuits 41 are used to factor-correct the AC power output from the AC power supply 20 and output DC power. The multiple first resonant circuits 42 connected in parallel and then in series with the PFC circuit effectively reduce the losses of switching elements during the conversion process using the resonance effect, improving the circuit's conversion efficiency and extending the system's lifespan. This parallel-series circuit layout structure makes the circuit more stable when handling high power density, while reducing circuit complexity and facilitating production and maintenance. Furthermore, the number of parallel first boost power factor correction circuits and multiple parallel first resonant circuits can be reasonably adjusted according to the power requirements of the server, and is not limited to... Figure 2 The quantity in.

[0039] In some alternative implementations, such as Figure 2 As shown, the second conversion module includes a second boost power factor correction circuit 51 and a second resonant circuit 52. The input of the second boost power factor correction circuit 51 is connected to the first switching unit 10, and its output is electrically connected to the input of the second resonant circuit 52. The output of the second resonant circuit 52 is electrically connected to the power supply module 60. The second boost power factor correction circuit 51 (boost PFC) in the second conversion module is connected to the first switching unit 10 and is used to charge the power supply module 60 when the AC power supply 20 is normal. The second resonant circuit 52 is designed to optimize the energy conversion process, especially the energy conversion efficiency during battery charging. This ensures that the battery charging path is independent and efficient, reduces charging time, and also avoids interference with the server power supply path.

[0040] In some alternative implementations, such as Figure 3 As shown, the AC / DC switching power supply circuit also includes an auxiliary module 80. The first terminal of the auxiliary module 80 is electrically connected to the AC power supply 20, and the second terminal is electrically connected to the power supply module 60. The auxiliary module 80 is used to enable the power supply module 60 to supply power to the server 30 when the AC power supply 20 fails. The auxiliary module 80 may include a sampling circuit (AC sampling circuit or BAT sampling circuit) and a driving device. The sampling circuit is used to detect whether the AC power supply 20 is outputting AC power normally. When the AC power supply 20 fails and the sampling circuit does not receive AC power, the driving device drives the power supply module to output current, triggering the second switching module to close, and the first switching unit closes to supply power to the server. The auxiliary module 80 may be a circuit module including a sampling circuit and a driving circuit, or a combination module of circuit and chip; this application does not specifically limit it. Figure 3 Other circuit structure references Figure 1 and Figure 2 .in, Figure 3 The diagram illustrates a complete system, and when the system capacity is large, it can consist of multiple identical [systems / modules]. Figure 3 This allows the system to be quickly expanded to meet higher load demands.

[0041] like Figure 4 As shown, the auxiliary module described above can solve the power supply problem when the AC power supply fails. The auxiliary module includes units for signal power supply and voltage sampling. One end of the auxiliary module is connected to the AC power supply (AC input), and the other end is connected to the power supply module (BAT input). It generates a signal power supply voltage Vs (see diagram) through a power conversion unit (such as a flyback circuit, forward circuit, or other isolation circuit). Figure 5 The signal power supply unit provides power to the control unit, isolation sampling unit, and switching unit drive. The circuitry of the isolation sampling unit collects AC and BAT input voltages and isolates the sampled signals. The control unit (which can be a control chip) determines the AC / BAT input status based on the sampled AC and BAT voltages and closes / opens the switching unit accordingly. When the AC input is abnormal and the BAT input is normal, the first switching unit is opened and the second switching unit is closed. When both the AC and BAT inputs are normal, or the AC input is normal but the BAT input is abnormal, the second switching unit is opened and the first switching unit is closed. In the event of an AC power failure, the auxiliary module can be activated immediately, opening the first switching unit to disconnect the AC power supply from the first power supply module and closing the second switching module to supply DC power to the server from the power supply module (such as a battery), thus ensuring continuous power supply and preventing data loss or hardware damage due to power outages. This application also allows manual switching of the states of the first and second switching modules.

[0042] like Figure 5 As shown, the power conversion unit circuit includes an AC input, first diodes D1-D4, capacitors C1 and Co, transistors Q1 and Q2, transformers T1 and T2, second diodes DR1-DR2, and a BAT input. The AC input and BAT input are converted into an output voltage acting on capacitor Co by transformers T1 and T2, respectively. The output voltage is output through pin Vs to... Figure 4 The signal power supply module in the middle supplies power to the control chip.

[0043] In addition to the auxiliary modules mentioned above, in some optional embodiments, the first and second switching units may include at least one of the following: a relay, a MOSFET, a thyristor, and a transistor. Selecting these switching devices enables fast and reliable control of the circuit's on / off state, while also providing low on-resistance and good switching performance. In practical applications, appropriate switching devices can be selected based on the required current and switching speed of the circuit. For example, for scenarios requiring rapid switching, a MOSFET can be chosen due to its faster switching speed.

[0044] In some alternative implementations, such as Figure 6As shown, the boost-type power factor correction circuit is a three-phase AC input circuit, which includes a first inductor 91, a second inductor 92, and a third inductor 93. The input terminals of all three inductors are connected to the AC power supply 20 via a first switching unit 10. The output terminals of all three inductors are sequentially connected to a first switch 94, a first capacitor 95, and a second switch 96. The boost PFC circuit can improve the power factor of the AC power supply. In traditional power systems, the power factor is the ratio of actual power to apparent power. Ideally, the power factor should be 1, meaning there is no reactive power loss in the power system. However, in practical applications, due to the presence of inductive or capacitive loads, the power factor is usually lower than 1, leading to decreased power system efficiency and increased grid load. The boost PFC circuit, employing inductors (first inductor 91, second inductor 92, and third inductor 93), a first capacitor 95, and switching elements (first switch 94 and second switch 96), dynamically compensates for reactive power in the circuit, thereby improving the power factor and boosting the converted DC voltage. The inductors (first inductor 91, second inductor 92, and third inductor 93) act as energy storage elements, smoothing the current in the circuit and reducing current fluctuations, thus reducing the phase difference between current and voltage. The first capacitor 95 provides instantaneous energy to compensate for inductive reactive power in the circuit. The switching elements (first switch 94 and second switch 96, such as MOSFETs or IGBTs) regulate the charging and discharging processes of the inductors and capacitors through high-speed switching operations, achieving reactive power compensation in the circuit. Specifically, Figure 6 The middle is a three-phase AC input, such as Figure 7 The single-phase AC input circuit shown is a boost-type power factor correction circuit, which is also applicable to this application. The single-phase AC input circuit includes an AC input terminal ( Figures 1 to 3 The AC power input terminal is connected to the circuit, with switching devices Q1 to Q4. Q1 and Q2 are connected in parallel, and Q3 and Q4 are connected in parallel. The two ends of capacitor C1 are connected in parallel to one end of Q1 and Q3 and one end of Q2 and Q4. The working principle of the boost PFC circuit is to control the conduction and cutoff of the switching elements so that the waveform of the input current is as close as possible to a sine wave and in phase with the input voltage, thereby reducing current distortion and phase difference and improving the power factor of the circuit. This circuit structure not only reduces energy loss in the power system but also reduces harmonic pollution of the power grid, playing an important role in improving the overall operating efficiency and stability of the power system.

[0045] In some alternative implementations, such as Figure 8As shown, the resonant circuit includes a switching network module 101, a resonant network module 102, and a rectifier-filter network module 103. The switching network module 101 is connected in parallel across the first capacitor 95. The resonant network module 102 is electrically connected to the switching network module 101, and the rectifier-filter network module 103 is electrically connected to the resonant network module 102. The switching network module 101, upon receiving a DC current, converts the input voltage into a series of pulse voltage signals through the rapid switching on and off of a switching element (such as a MOSFET), thereby achieving energy transmission and regulation. The resonant network module 102, through the principle of resonance, optimizes the operation of the switching network module, reduces energy loss during the switching process, and improves conversion efficiency. The rectifier-filter network module 103 converts the pulsed DC voltage output from the switching network module 101 and the resonant network module 102 into a smooth DC voltage and provides it to the server. Figure 7 The leftmost DC is Figure 6 The rightmost DC power source.

[0046] In some alternative implementations, such as Figure 8 As shown, the switch network module 101 includes multiple parallel first branches, each first branch including two series-connected switch modules 104. Each switch module 104 includes switching devices Q1-Q6, first unidirectional conducting devices D1-D6, and second capacitors C1-C6. Switching devices Q1-Q6 are connected in parallel with the first unidirectional conducting devices D1-D6 and the second capacitors C1-C6, respectively. These switching devices operate at specific frequencies and duty cycles. By controlling the conduction time of these switching devices, the output voltage is adjusted to achieve boost or buck conversion. In some circuits, the switch network module 101 employs zero-voltage or zero-current switching technology to reduce switching losses and improve conversion efficiency.

[0047] In some alternative implementations, such as Figure 8 As shown, the resonant network module 102 includes multiple second branches, each electrically connected to a first branch. The connection point between the second and first branches is located between the two switching modules 104. Each second branch includes a series-connected third capacitor Cr1-Cr3 and a fourth inductor Lr1-Lr3. During the switching instant of the switching network module 101, the first inductor and third capacitor in the resonant network module 102 resonate with the primary winding of the transformer, smoothing voltage and current changes during the switching process, reducing stress on the switching devices, thereby reducing switching losses and improving circuit conversion efficiency. In specific circuits, the resonant network module 102 can also achieve soft-switching operation, further improving efficiency.

[0048] In some alternative implementations, such as Figure 8As shown, the rectifier-filter network module 103 includes multiple third branches and multiple transformers T1 to T3. Each third branch includes two series-connected second unidirectional conducting devices DR1 to DR6. The multiple third branches are connected in parallel with a fourth capacitor Co. The first terminals of the multiple transformers T1 to T3 are electrically connected to the third branches one-to-one, with the connection points located between the two second unidirectional conducting devices (between DR1 and DR2, DR3 and DR4, and DR5 and DR6). The second terminals of the multiple transformers T1 to T3 are interconnected, and the third terminals of the multiple transformers T1 to T3 are interconnected. The fourth terminals of the multiple transformers are electrically connected to multiple fourth inductors Lr1 to Lr3 one-to-one. The second unidirectional conducting devices can be rectifier diodes, which convert pulsating DC voltage into unidirectional pulsating voltage. The fourth capacitor Co is a filter capacitor, used to eliminate high-frequency noise in the rectified voltage, smooth the voltage waveform, ensure the stability and purity of the output voltage, and provide high-quality DC power to the load (server).

[0049] In the above embodiments, such as Figure 8 As shown, resistor Ro is the protection resistor of the resonant circuit. It can protect the circuit from overload damage when the current in the resonant circuit exceeds a predetermined current.

[0050] The AC / DC switching power supply circuit proposed in the above embodiments of this application can achieve the following technical effects:

[0051] 1) Under normal AC power supply conditions, the AC / DC switching power supply circuit of this application connects the AC power supply to the first conversion module to supply power to the server, and simultaneously connects the AC power supply to the second conversion module to supply power to the power supply module. The power supply module stores electrical energy. In the event of an AC power failure, the first switching unit disconnects the AC power supply from both the first and second switching units, and the second switching unit connects the power supply module to the first conversion module to replace the AC power supply and continue supplying power to the server. In the event of an AC power failure, the power supply module can quickly take over the server's power supply, avoiding the risk of server data interruption and hardware damage. Furthermore, because the charging and discharging paths of the power supply module are independent, it is easier to maintain and manage in the future compared to having the power supply module attached to the server, solving the problem of inconvenient maintenance in existing data center power supply systems.

[0052] 2) The battery in the AC / DC switching power supply circuit of this application is not directly connected to the system bus, but is separated to facilitate the refined processing of the AC center system.

[0053] 3) The AC / DC switching power supply circuit of this application can select an appropriate number of parallel first boost power factor correction circuits and parallel first resonant circuits according to the current required by the server to provide a sufficiently large current to the server.

[0054] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An AC / DC switching power supply circuit, characterized in that, include: The first switching unit is connected to the output terminal of the AC power supply and is used at least to supply power to the server from the AC power supply. A first conversion module, wherein the input terminal of the first conversion module is connected to the first switching unit, and the output terminal is electrically connected to the server, and the output terminal is used to supply power to the server; The second conversion module has its input end connected to the first switching unit and its output end electrically connected to the power supply module. The second switching unit has a first end connected to the first switching unit and the first conversion module, and a second end electrically connected to the power supply module. The second switching unit is used to enable the power supply module to supply power to the server when the AC power supply fails.

2. The AC / DC switching power supply circuit according to claim 1, characterized in that, The first conversion module includes multiple first boost power factor correction circuits and multiple first resonant circuits, wherein the multiple first boost power factor correction circuits are connected in parallel, the multiple first resonant circuits are connected in parallel, and the parallel branches of the multiple first boost power factor correction circuits and the parallel branches of the multiple first resonant circuits are connected in series.

3. The AC / DC switching power supply circuit according to claim 1, characterized in that, The second conversion module includes a second boost power factor correction circuit and a second resonant circuit. The input terminal of the second boost power factor correction circuit is connected to the first switching unit, and the output terminal is electrically connected to the input terminal of the second resonant circuit. The output terminal of the second resonant circuit is electrically connected to the power supply module.

4. The AC / DC switching power supply circuit according to claim 1, characterized in that, The AC / DC switching power supply circuit also includes an auxiliary module. The first end of the auxiliary module is electrically connected to the AC power source, and the second end of the auxiliary module is electrically connected to the power supply module. The auxiliary module is used to enable the power supply module to supply power to the server when the AC power source fails.

5. The AC / DC switching power supply circuit according to claim 2 or 3, characterized in that, The boost-type power factor correction circuit is a three-phase AC input circuit, which includes a first inductor, a second inductor, and a third inductor. The input terminals of the first inductor, the second inductor, and the third inductor are all connected to the AC power supply through the first switching unit. The output terminals of the first inductor, the second inductor, and the third inductor are all connected to a first switch, a first capacitor, and a second switch in sequence.

6. The AC / DC switching power supply circuit according to claim 5, characterized in that, The resonant circuit includes a switching network module, a resonant network module, and a rectifier-filter network module. The switching network module is connected in parallel across the capacitor, the resonant network module is electrically connected to the switching network module, and the rectifier-filter network module is electrically connected to the resonant network module.

7. The AC / DC switching power supply circuit according to claim 6, characterized in that, The switch network module includes multiple parallel first branches, each first branch including two series-connected switch modules. Each switch module includes a switch device, a first unidirectional conducting device, and a second capacitor. The switch device is connected in parallel with the first unidirectional conducting device and the second capacitor, respectively.

8. The AC / DC switching power supply circuit according to claim 7, characterized in that, The resonant network module includes multiple second branches, each of which is electrically connected to the first branch. The connection point between the second branch and the first branch is located between the two switching modules. Each second branch includes a third capacitor and a fourth inductor connected in series.

9. The AC / DC switching power supply circuit according to claim 8, characterized in that, The rectifier-filter network module includes multiple third branches and multiple transformers. Each third branch includes two second unidirectional conducting devices connected in series. The multiple third branches are connected in parallel with a fourth capacitor. The first terminals of the multiple transformers are electrically connected to the third branches one by one, and the connection points are located between the two second unidirectional conducting devices. The second terminals of the multiple transformers are interconnected. The third terminals of the multiple transformers are interconnected. The fourth terminals of the multiple transformers are electrically connected to the multiple fourth inductors one by one.

10. The AC / DC switching power supply circuit according to claim 1, characterized in that, The first switching unit and the second switching unit include at least one of the following: a relay, a MOSFET, a thyristor, and a transistor.

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