Power supply device and power supply system

Abstract

The embodiment of the present application provides a power supply device, comprising a first PSU and a second PSU, the first PSU comprises a first interface circuit, the first interface circuit comprises a first input side and a first output side, a second input side of a second interface circuit of the second PSU is used for being connected in parallel with the first input side of the first interface circuit; the first interface circuit further comprises a first fuse, a first on-off component and a first capacitor, the first input side comprises a first positive input end and a first negative input end, the first output side comprises a first positive output end and a first negative output end, the first fuse and the first on-off component are connected in series between the first positive input end and the first positive output end, and the two ends of the first capacitor are connected with the first positive output end and the first negative output end respectively. The power supply device provided by the embodiment of the present application ensures the normal work of the electric equipment, and the power supply reliability of the power supply device is high.

Description

Technical Field

[0001] This invention relates to the field of power supply technology, and in particular to power supply devices and power supply systems. Background Technology

[0002] With the rapid growth of high-performance computing applications such as artificial intelligence, machine learning, and big data mining, the performance of servers in data centers is constantly improving. High-power servers generally require power supplies with redundant designs.

[0003] In the prior art, redundant power supply systems include multiple parallel power supply units (PSUs) used to power the server, and the inputs of the multiple parallel power supply units share a single bus.

[0004] However, when a transformer module in one of the power supply units experiences a short circuit, the input of that power supply unit will be directly disconnected without time to be cut off, causing multiple power supply units sharing a busbar to lose power, which in turn leads to the server power failure and paralysis, indicating low power supply reliability. Summary of the Invention

[0005] The purpose of this invention is to provide a power supply device to solve the technical problem of low power supply reliability of multiple parallel power supply units in the prior art. The specific technical solution is as follows:

[0006] In a first aspect, embodiments of the present invention provide a power supply device, including a first PSU and a second PSU for supplying power to electrical equipment. The structure of the second PSU is the same as that of the first PSU. The first PSU includes a first interface circuit, which includes a first input side and a first output side. The second input side of the second interface circuit of the second PSU is connected in parallel with the first input side of the first interface circuit.

[0007] The first interface circuit further includes a first fuse, a first switching component, and a first capacitor. The first input side includes a first positive input terminal and a first negative input terminal, and the first output side includes a first positive output terminal and a first negative output terminal. The first fuse and the first switching component are connected in series between the first positive input terminal and the first positive output terminal. The two ends of the first capacitor are respectively connected to the first positive output terminal and the first negative output terminal. The first switching component is used to conduct when the first PSU is powered on and to cut off when the voltage on the first input side is less than the voltage on the first output side.

[0008] Optionally, the first switching component is a first unidirectional thyristor, the anode of the first unidirectional thyristor is connected to the first positive input terminal through the first fuse, and the cathode of the first unidirectional thyristor is connected to the first positive output terminal.

[0009] Optionally, the first PSU further includes a third interface circuit with the same structure as the first interface circuit. The first input side of the first interface circuit is used to connect to the first power supply, the third input side of the third interface circuit is used to connect to the second power supply, and the first output side of the first interface circuit is connected in parallel with the third output side of the third interface circuit.

[0010] Optionally, the first interface circuit further includes a first diode, the positive terminal of which is connected to the first negative input terminal, the negative terminal of which is connected to the cathode of the first unidirectional thyristor, and the first diode is connected in parallel with the first capacitor.

[0011] Optionally, the first diode is a transient voltage suppressor diode.

[0012] Optionally, the first interface circuit further includes a first branch, which includes a first switching component and a first resistor connected in series. The first branch is connected in parallel with the first unidirectional thyristor. The first switching component is used to turn on the first branch and is also used to turn off the first branch when the first unidirectional thyristor is turned on.

[0013] Optionally, the first interface circuit further includes a first varistor, the first end of which is connected to the anode of the first unidirectional thyristor and the first negative input terminal, respectively. The first end of the first varistor is also connected to the negative terminal of the first diode through the first switching component and the first resistor, and the second end of the first varistor is also connected to the positive terminal of the first diode.

[0014] Optionally, the first switching component includes any one of a diode, a thyristor, and a MOSFET.

[0015] Optionally, the first fuse includes a fusible link.

[0016] Secondly, embodiments of the present invention provide a power supply system, including any of the power supply devices described above.

[0017] In the power supply device provided in this embodiment of the invention, when both the first PSU and the second PSU are powered, the first switching component in the first PSU and the second switching component in the second PSU are both conducting. If a short circuit fault occurs on the second output side of the second interface circuit in the second PSU, before the second fuse in the second interface circuit blows, the second PSU will pull down the voltage on the second input side of the second interface circuit and the voltage on the first input side of the first interface circuit. At this time, because the voltage on the first input side of the first interface circuit is pulled down, the voltage on the first input side will be lower than the voltage on the first output side. Then the first switching component in the first interface circuit will be cut off. At this time, energy is released through the first capacitor to provide voltage to the first output side, so that the first PSU can continue to supply power to the electrical equipment, so as to ensure that the first PSU can work normally until the second fuse in the second interface circuit blows and the voltage on the first input side returns to normal. The power supply device provided in this embodiment of the invention ensures that even if a short circuit fault occurs on the second output side of the second PSU, the first PSU can still work normally to supply power to the electrical equipment, thereby ensuring the normal operation of the electrical equipment. In other words, the power supply device has high power supply reliability. Furthermore, when a short circuit fault occurs on the second output side of the second PSU, the first switching component in the first PSU will immediately cut off and release energy through the first capacitor to provide voltage to the first output side, thus avoiding power loss of the electrical equipment due to the second fuse not blowing in time. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0019] Figure 1 This is a schematic diagram of the interface circuit in a current PSU.

[0020] Figure 2 This is a schematic diagram of the structure of the first interface circuit in the first PSU of the power supply device provided in this embodiment of the invention. Figure 1 ;

[0021] Figure 3 This is a schematic diagram of the structure of the first interface circuit in the first PSU of the power supply device provided in this embodiment of the invention. Figure 2 ;

[0022] Figure 4 This is a schematic diagram of the structure of the first interface circuit and the second interface circuit in the power supply device provided in the embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of the structure of the first interface circuit and the third interface circuit in the power supply device provided in the embodiment of the present invention.

[0024] Figure label:

[0025] 10-First interface circuit, 11-First input side, 12-First output side, 13-First fuse, 14-First unidirectional thyristor, 15-First capacitor, 16-First diode, 17-First switching component, 18-First resistor, 19-First varistor, 20-Second interface circuit, 30-Third interface circuit. Detailed Implementation

[0026] The technical solutions of the present invention will now be described with reference to the accompanying drawings in the embodiments of the present invention.

[0027] The embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention. The invention is described more specifically in the following paragraphs by way of example with reference to the accompanying drawings. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the invention.

[0028] With the rapid growth of high-performance computing applications such as artificial intelligence, machine learning, and big data mining, centralized computing and storage in data centers are booming. To meet these ever-increasing demands, a large number of large data centers have been built for data computing, processing, and storage, making data centers a critical infrastructure supporting the normal operation of modern society. The power supply backup systems in large data centers employ multiple backup and complex redundancy architectures. For example, the power supply to communication equipment uses dual or multiple buses, and the PSUs (Power Supply Units) for communication equipment use 1+1 redundancy, N+1 redundancy, N+N redundancy, or even 2*(N+1) redundancy.

[0029] Reference Figure 1 Currently, the interface circuit in a PSU includes a fuse F1, switching transistors Q1 and Q2, a resistor R1, a diode D1, and a capacitor C1. The input voltage of the interface circuit is denoted by Vin, and the output voltage is denoted by Vo. The main power supply circuit consists of fuse F1, switching transistors Q1 and Q2, while the charging branch consists of resistor R1 and diode D1. The conduction states of switching transistors Q1 and Q2 in the interface circuit are controlled by a control circuit. The PSU also includes a transformer module for voltage conversion. In PSU parallel redundancy and PSU multi-source redundancy applications, if a transformer module of a PSU fails, such as in the event of a short circuit, there is a risk of pulling the bus low and causing a system power outage. This is unacceptable in high-reliability, high-data-security systems such as servers with parallel or multi-source redundant power supplies.

[0030] For example, when the interface circuits of multiple PSUs are connected in parallel, meaning the input sides of multiple interface circuits are connected in parallel, and the inputs of multiple PSUs share a single bus, if the transformer module of one of the PSUs experiences a short circuit fault during normal operation, the fuse F1 takes time to blow (i.e., there is a reaction delay). This will directly disconnect the power to the input of that PSU, preventing it from being disconnected in time. Consequently, all PSUs sharing the same bus will lose power, leading to a power outage and server paralysis. This indicates low power supply reliability and will also affect the data security of the server.

[0031] To address the aforementioned problems, embodiments of the present invention provide a power supply device and a power supply system, which are described in detail below.

[0032] Firstly, referring to Figures 2 to 5 The power supply device provided in this embodiment of the invention includes a first PSU and a second PSU for supplying power to electrical equipment. The structure of the second PSU is the same as that of the first PSU. The first PSU includes a first interface circuit 10, which includes a first input side 11 and a first output side 12. The second input side of the second interface circuit 20 of the second PSU is connected in parallel with the first input side 11 of the first interface circuit 10. The first interface circuit 10 also includes a first fuse 13, a first switching component, and a first capacitor 15. The first input side 11 includes a first positive input terminal and a first negative input terminal. The first output side includes a first positive output terminal and a first negative output terminal. The first fuse 13 and the first switching component are connected in series between the first positive input terminal and the first positive output terminal. The two ends of the first capacitor 15 are respectively connected to the first positive output terminal and the first negative output terminal. The first switching component is used to conduct when the first PSU is powered and to cut off when the voltage on the first input side is less than the voltage on the first output side.

[0033] Specifically, the power supply unit includes multiple PSUs with identical structures, including a first PSU and a second PSU. It should be noted that the multiple PSUs of the power supply unit may include other PSUs with the same structure as the first PSU, in addition to the first and second PSUs. For example, when the power supply unit includes four PSUs, it includes two additional PSUs with the same structure as the first PSU, and the connection and power connection methods of these two additional PSUs are the same as those of the first and second PSUs.

[0034] The second PSU has the same structure as the first PSU. The first PSU includes a first interface circuit 10, and the second PSU includes a second interface circuit 20 with the same structure as the first interface circuit 10. That is, the second interface circuit 20 includes a second input side, a second output side, a second fuse, a second switching component, and a second capacitor. (Refer to...) Figure 4The first capacitor 15 is represented by C1, and the second capacitor is represented by C2.

[0035] Both the first PSU and the second PSU can be used to convert high-voltage direct current (HVDC) to low-voltage direct current (DC), or to convert high-voltage alternating current (AC) to low-voltage DC. The first PSU receives a first input voltage and converts it into a first supply voltage. The first PSU uses this first supply voltage to supply power to the electrical device. The electrical device can be a server or a transformer, etc., and the first and second PSUs can be installed within the electrical device. The first PSU also includes a first main power circuit for power conversion. The first main power circuit is connected to the first output side 12 of the first interface circuit 10. The first main power circuit outputs the first supply voltage and supplies power to the electrical device.

[0036] The first input side 11 in the first interface circuit 10 can be plugged into the first power distribution unit (PDU), which provides a first input voltage to the first input side. Similarly, the second input side in the second interface circuit 20 can be plugged into the first power distribution unit. The first power distribution unit is electrically connected to a first power supply, which can be AC ​​mains power, a first HVDC (High Voltage Direct Current) transmission device, etc. When both the first input side 11 and the second input side are plugged into the first power distribution unit, the second input side is connected in parallel with the first input side 11.

[0037] The first fuse can be a fusible linker, denoted as F1. This fusible linker provides protection for the first interface circuit 10. When a short circuit occurs in the first main power circuit connected to the first output side 12, the fusible linker melts after accumulating a certain amount of heat, thus isolating the first interface circuit 10. In other words, the first interface circuit 10 has the function of fuse protection. The first switching component can be a first unidirectional thyristor 14, or a MOS switch plus a diode structure, or an electromagnetic switch plus a diode structure. The first positive input terminal is... Figure 2 The first input side 11, represented by the "+" sign, is the first negative input terminal. Figure 2 The terminal indicated by the "-" sign in the first input side 11. The first positive output terminal is... Figure 2 The terminal indicated by the "+" sign on the first output side 12 is the first negative output terminal. Figure 2The first output side 12 is indicated by the "-" sign. The first positive input terminal and the first positive output terminal are connected through a first main circuit, and the first fuse 13 and the first switching component are connected in series on the first main circuit. The first negative input terminal and the first negative output terminal are connected through a second main circuit. The first interface circuit 10 also includes a second branch, and the first capacitor 15 is disposed on the second branch. The second branch is connected to the first main circuit and the second main circuit.

[0038] The voltage on the first input side is denoted by Vin1, and the voltage on the first output side is denoted by Vo1. The first switching component is used to turn on when the first PSU is powered on. This means the first main circuit is on, the first output side 12 is connected to the first main power circuit, current flows through the first main circuit, and the first PSU is powered on, supplying power to the electrical equipment. The first switching component is also used to turn off when the voltage Vin1 on the first input side is less than the voltage Vo1 on the first output side, at which point the first main circuit is off. It should be noted that the first input side 11 is specifically connected to DC power, and it is positively charged. That is, if the voltage Vin1 on the first input side is greater than 0, then the voltage Vo1 on the first output side is also greater than 0. When the first switching component is on, i.e., when the first main circuit is on, the voltage Vin1 on the first input side is slightly greater than the voltage Vo1 on the first output side. The voltage Vin1 on the first input side minus the voltage drop across the first switching component equals the voltage Vo1 on the first output side.

[0039] In the power supply device provided in this embodiment of the invention, when both the first PSU and the second PSU are powered, the first switching component in the first PSU and the second switching component in the second PSU are both conducting. If a short circuit fault occurs on the second output side of the second interface circuit 20 in the second PSU, before the second fuse in the second interface circuit blows, the second PSU will pull down the voltage of the second input side of the second interface circuit 20 and the voltage of the first input side 11 of the first interface circuit 10. At this time, because the voltage of the first input side 11 of the first interface circuit 10 is pulled down, the voltage of the first input side 11 will be lower than the voltage of the first output side 12. Then the first switching component in the first interface circuit 10 will be cut off. At this time, the energy is released through the first capacitor 15 to provide voltage to the first output side 12 so that the first PSU can continue to supply power to the electrical equipment, so as to ensure that the first PSU can operate until the second fuse in the second interface circuit 20 blows and the voltage of the first input side 11 returns to normal. At this time, the first PSU continues to work normally. It should be noted that the above description is based on the example of a short circuit fault occurring on the second output side of the second interface circuit 20. Similarly, when a short circuit fault occurs on the first output side of the first interface circuit 10 in the first PSU, the second PSU can still work normally. That is, the fault-free PSU in this embodiment of the invention has a self-disconnection function.

[0040] The power supply device provided in this embodiment of the invention ensures that even if a short circuit fault occurs on the second output side of the second PSU, the first PSU can still operate normally to supply power to the electrical equipment, thereby ensuring the normal operation of the electrical equipment, i.e., the power supply device has high power supply reliability; and when a short circuit fault occurs on the second output side of the second PSU, the first switching component in the first PSU will immediately disconnect and release energy through the first capacitor 15 to provide voltage to the first output side 12, avoiding power loss of the electrical equipment due to the second fuse not blowing in time; furthermore, when the electrical equipment is a server, it can also ensure the security of the data stored on the server.

[0041] The first switching component is a first unidirectional thyristor 14. The anode of the first unidirectional thyristor 14 is connected to the first positive input terminal through the first fuse 13, and the cathode of the first unidirectional thyristor 14 is connected to the first positive output terminal.

[0042] Specifically, refer to Figure 3 The first unidirectional thyristor 14, represented by SCR1, has an anode 1, a cathode 2, and a control pin 3. When a drive signal is applied to the control pin 3, and a positive voltage is applied to the first unidirectional thyristor 14, the first unidirectional thyristor 14 conducts, and when conducting, it is equivalent to a diode. When a negative voltage is applied to the first unidirectional thyristor 14, the first unidirectional thyristor 14 is cut off. The anode 1 of the first unidirectional thyristor 14 is connected to the first positive input terminal through the first fuse 13, and the cathode 2 of the first unidirectional thyristor 14 is connected to the first positive output terminal.

[0043] When the first input side 11 is connected to DC power, and the voltage Vin1 on the first input side changes from being slightly greater than the voltage Vo1 on the first output side to being less than the voltage Vo1 on the first output side, the current in the first branch reverses, meaning that a negative voltage is applied to the first unidirectional thyristor 14, and the first unidirectional thyristor 14 is cut off. In this embodiment of the invention, the function of the first switching component can be realized by setting the first unidirectional thyristor 14, and the first unidirectional thyristor 14 can only conduct when it is connected to a positive voltage and is subject to a driving signal, meaning that the first unidirectional thyristor 14 has controllable performance. It should be noted that when the first input side 11 is connected to AC power, the first switching component can be a bidirectional thyristor or two unidirectional thyristors.

[0044] Reference Figure 5 The first PSU also includes a third interface circuit 30 with the same structure as the first interface circuit 10. The first input side 12 of the first interface circuit 10 is used to connect to the first power supply, the third input side of the third interface circuit 30 is used to connect to the second power supply, and the first output side 12 of the first interface circuit 10 and the third output side of the third interface circuit 30 are connected in parallel.

[0045] Specifically, the third interface circuit 30 has the same structure as the first interface circuit 10. The third interface circuit 30 includes a third input side, a third output side, a third fuse, a third switching component, and a third capacitor. The first power supply can be AC ​​mains power, a first HVDC device, etc.; the second power supply can be AC ​​mains power, a second HVDC device, etc. The third input side of the third interface circuit 30 can be plugged into the second power distribution unit. The second power distribution unit is electrically connected to the second power supply, and the second power supply supplies power to the third input side through the second power distribution unit. The first output side 12 and the third output side can be connected in parallel to the first main power circuit.

[0046] It should be noted that the first PSU may include more than just the first interface circuit 10 and the third interface circuit 30. It may also include other interface circuits that are the same as the first interface circuit 10. That is, the first PSU may be equipped with two or more interfaces, and the same applies to the second PSU.

[0047] The structure of the second PSU is the same as that of the first PSU, that is, the second PSU also includes a fourth interface circuit. The fourth input side of the fourth interface circuit is connected to the second power supply through the second power distribution unit, and the second output side of the second interface circuit 20 is connected in parallel with the fourth output side of the fourth interface circuit. When the first power supply is the first HVDC device and the second power supply is the second HVDC device, both the first PSU and the second PSU are dual HVDC bus inputs, that is, the first PSU and the second PSU are dual HVDC bus, 1+1 redundant PSUs.

[0048] When the second power supply fails to supply power, causing the third input side of the third interface circuit 30 to be disconnected, the equipment can be powered by the first power supply, the first interface circuit 10 in the first PSU and the first main power circuit. This avoids the situation where the equipment loses power if only one power supply fails to supply power.

[0049] Even though the current PSU uses dual-input buses, that is, two... Figure 1 The interface circuits in the system, with the output sides of the two interface circuits connected in parallel, can avoid the situation where the equipment loses power if the power supply fails due to a single power supply failure. However, if a short circuit occurs on one of the input buses, it will pull down or de-energize the output side of the interface circuit connected to that input bus, which in turn will pull down or de-energize the output side of the other interface circuit, resulting in a power outage on all input buses and ultimately causing the server to shut down.

[0050] In this embodiment of the invention, when a short circuit fault occurs in the second power supply, causing a short circuit on the third input side of the third interface circuit 30, SCR3 is reverse-biased and cut off. At this time, the third interface circuit 30 will not affect the operation of the first interface circuit 10, that is, the first interface circuit 10 operates normally, SCR1 is turned on, and power can be supplied to the electrical equipment through the first power supply, the first interface circuit 10, and the first main power circuit. When a short circuit fault occurs in the first power supply, causing a short circuit on the first input side of the first interface circuit 10, SCR1 is reverse-biased and cut off. At this time, the first interface circuit 10 will not affect the operation of the third interface circuit 30, that is, the third interface circuit 30 operates normally, SCR3 is turned on. That is, in this embodiment of the invention, when one of the first power supply and the second power supply experiences a short circuit fault, one interface circuit in the first PSU can still operate normally, ensuring the normal operation of the electrical equipment. The power supply reliability of the power supply device is high, and it avoids the faulty interface circuit pulling down or de-energizing the output terminals of other interface circuits.

[0051] The first interface circuit 10 also includes a first diode 16, the positive terminal of which is connected to the first negative input terminal, the negative terminal of which is connected to the cathode of the first unidirectional thyristor 14, and the first diode 16 is connected in parallel with the first capacitor 15.

[0052] Specifically, the first interface circuit 10 also includes a third branch, which is connected to the first main circuit and the second main circuit. The connection point between the third branch and the first main circuit is located between the first unidirectional thyristor 14 and the connection point between the second branch and the first main circuit. The third branch is connected in parallel with the second branch, and the first diode 16 is disposed on the third branch, as shown in the reference. Figure 3 The positive terminal 2 of the first diode 16 is connected to the first negative input terminal, and the negative terminal 1 of the first diode 16 is connected to the cathode 2 of the first unidirectional thyristor 14.

[0053] If a reverse voltage is applied to the first input side, the positive voltage will pass through the first negative input terminal, the first diode 16, and the cathode of the first unidirectional thyristor 14, while the negative voltage will pass through the first positive input terminal, the first fuse, and the anode of the first unidirectional thyristor 14. In other words, the first unidirectional thyristor 14 is connected to a negative voltage, and thus it is cut off, and the first main circuit is blocked. In this embodiment of the invention, the first diode 16 enables the function of preventing reverse connection on the first input side. Furthermore, when the first interface circuit 10 implements the reverse connection prevention function, the circuit is in an open circuit state, and the large input current will not cause the first fuse to overheat and blow. Therefore, the reverse connection prevention function does not require frequent fuse replacements, thus avoiding the risk of burning out the fuse.

[0054] The first diode 16 is a transient voltage suppressor diode. Specifically, when the first diode 16 is a transient voltage suppressor diode, it can be represented by TVS1. When the first PSU is working normally to supply power to the equipment, TVS1 plays a role in surge suppression; in addition, when an abnormal fault condition inside the first PSU causes a short circuit, TVS1 can provide a discharge circuit.

[0055] The first interface circuit 10 also includes a first branch, which includes a first switching component 17 and a first resistor 18 connected in series. The first branch is connected in parallel with the first unidirectional thyristor 14. The first switching component 17 is used to turn on the first branch. The first switching component 17 is also used to turn off the first branch when the first unidirectional thyristor 14 is turned on.

[0056] Specifically, the first switching component 17 includes any one of a first diode, a second thyristor, a MOSFET, an electromagnetic switch, and a mechanical switch. (Refer to...) Figure 3 The first switching component 17 is represented by Q1, and the first resistor 18 is represented by R1. The first resistor 18 can be a resistor with a fixed resistance value or a resistor with a variable resistance value, such as a positive temperature coefficient thermistor, a negative temperature coefficient thermistor, etc.

[0057] When the first interface circuit 10 is hot-plugged and powered on, a drive signal is not initially applied to the control pin 3 of the first unidirectional thyristor 14, meaning the first unidirectional thyristor 14 is not initially turned on, i.e., the first main circuit is not open. Instead, the first switching component 17 is first turned on to open the first branch. At this time, the surge generated at the moment of hot-plugging and power-on can be current-limited by the first switching component 17 and the first resistor 18 to charge the first capacitor 15, and then discharged through the TVS1. After the hot-plugging surge is suppressed, the first unidirectional thyristor 14 is turned on after a certain delay, and the first switching component 17 is turned off simultaneously, entering the normal power supply state. When the first interface circuit 10 is in the normal power supply state, the first branch is open, i.e., no current flows through the first branch. In this embodiment of the invention, the first interface circuit 10 has a hot-plugging function. It should be noted that in other methods, the first branch may only include the first resistor 18.

[0058] The first interface circuit 10 also includes a first varistor 19. The first end and the second end of the first varistor 19 are respectively connected to the anode and the first negative input terminal of the first unidirectional thyristor 14. The first end of the first varistor 19 is also connected to the negative terminal of the first diode 16 through the first switching component 17 and the first resistor 18. The second end of the first varistor 19 is also connected to the positive terminal of the first diode 16.

[0059] Specifically, refer to Figure 3The first varistor 19 can be represented by MOV1. The first interface circuit 10 also includes a fourth branch. The first varistor 19 is connected to the fourth branch. The fourth branch is connected to the first main branch and the second main branch. The first branch is connected to the third branch and the fourth branch.

[0060] When the first interface circuit 10 is hot-plugged and powered on, the surge generated at the moment of hot-plugging and power-on is discharged by the MOV1 limiting clamp. The residual surge is current-limited by the first switching component 17 and the first resistor 18 to charge the first capacitor 15, and is discharged again by the TVS1. After the hot-plugging surge suppression is completed, the first unidirectional thyristor 14 is turned on after a certain delay and the first switching component 17 is turned off at the same time, and the circuit enters the normal power supply state.

[0061] During normal power supply to the first PSU, a surge couples to the first input side 11, passes through the first fuse 13 to the MOV1 for clamping and discharge, and the residual surge then passes through the SCR1 to the TVS1 for clamping and discharge. The clamping voltage of the MOV1 is greater than or equal to the clamping voltage of the TVS1, and both the clamping voltages of the MOV1 and the TVS1 are greater than the maximum value of the voltage on the first input side 11. The first resistor 18 is used to limit the surge current, and its power derating and power magnitude are related to the capacitance of the first capacitor 15 and the voltage magnitude on the first input side 11. In this embodiment of the invention, the first interface circuit 10 has a surge suppression clamping and discharge function, which can effectively discharge both lightning surges and transient surges inside the first PSU.

[0062] The first switching component 17 includes any one of a diode, a thyristor, and a MOSFET. Specifically, refer to... Figure 2 and Figure 3 The first switching component 17 can be a MOSFET, or it can be a mechanical switch, relay, or other electromagnetic switch. MOSFETs, mechanical switches, and electromagnetic switches can all be controlled to turn on and off. In this embodiment of the invention, when the first switching component 17 is a MOSFET, its controllability is strong; when the first switching component 17 is a diode or thyristor, the first branch is blocked when reverse current is applied to the first input side 11, thereby achieving reverse connection protection.

[0063] The first fuse 11 includes a fuse, see reference Figure 3 The fuse can be represented by F1. The fuse has a simple structure and low cost. In this embodiment of the invention, F1 and SCR1 provide mutual protection or dual protection. When a short circuit occurs on the first output side 12, causing a large current, the large current passes through F1 and SCR1. F1 heats up rapidly and may melt quickly to protect SCR1. The SCR1 drive signal is pulled low to quickly disconnect the fuse F1.

[0064] In summary, the first interface circuit 10 in the first PSU of the power supply device provided in this embodiment of the invention has fuse protection, surge suppression, hot-plugging, reverse connection protection, and self-disconnection functions. Furthermore, the first interface circuit 10 includes fewer components, meaning that more functions can be achieved with fewer components. It should be noted that the above description only describes the structure of the first interface circuit 10 in the first PSU. The structure of the second interface circuit 20 and the interface circuits in other PSUs can refer to the structure of the first interface circuit 10 and also possess the functions of the first interface circuit 10.

[0065] Secondly, embodiments of the present invention provide a power supply system that includes any of the power supply devices described in the first aspect above. Since the power supply system includes the aforementioned power supply devices, it also possesses the beneficial effects of those devices.

[0066] The power supply system may further include a first power distribution unit, a second power distribution unit, a first power supply, and a second power supply. The first power supply is electrically connected to the first power distribution unit, which is used to electrically connect to the first interface circuit in the first PSU and the second interface circuit in the second PSU. The second power supply is electrically connected to the second power distribution unit, which is used to electrically connect to the third interface circuit in the first PSU and the fourth interface circuit in the second PSU. The first power supply can be AC ​​mains power, a first HVDC device, etc., and the second power supply can be AC ​​mains power, a second HVDC device, etc. It should be noted that the first and second power distribution units can be ordinary power distribution units without circuit breakers to reduce the cost and space occupied by the first and second power distribution units.

[0067] The power supply system provided in this embodiment includes the various structures of the power supply device in any of the above embodiments. To avoid repetition, these will not be described again here.

[0068] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0069] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0070] The various embodiments in this specification are described in a related manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0071] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

[0072] The power supply device and power supply system provided by the present invention have been described in detail above. Specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only for the purpose of helping to understand the structure and core idea of ​​the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A power supply device, characterized in that, The device includes a first PSU and a second PSU for supplying power to electrical equipment. The structure of the second PSU is the same as that of the first PSU. The first PSU includes a first interface circuit, which includes a first input side and a first output side. The second input side of the second interface circuit of the second PSU is connected in parallel with the first input side of the first interface circuit. The first interface circuit further includes a first fuse, a first switching component, and a first capacitor. The first input side includes a first positive input terminal and a first negative input terminal, and the first output side includes a first positive output terminal and a first negative output terminal. The first fuse and the first switching component are connected in series between the first positive input terminal and the first positive output terminal. The two ends of the first capacitor are respectively connected to the first positive output terminal and the first negative output terminal. The first switching component is used to conduct when the first PSU is powered on and to cut off when the voltage on the first input side is less than the voltage on the first output side. Both the first PSU and the second PSU are powered and operated. When a short circuit fault occurs on the second output side of the second interface circuit in the second PSU, causing the voltage on the first input side to be lower than the voltage on the first output side, the first switching component is cut off, and the first capacitor releases energy to provide voltage to the first output side, so that the first PSU continues to supply power to the electrical equipment until the second fuse in the second interface circuit blows.

2. The power supply device according to claim 1, characterized in that, The first switching component is a first unidirectional thyristor. The anode of the first unidirectional thyristor is connected to the first positive input terminal through the first fuse, and the cathode of the first unidirectional thyristor is connected to the first positive output terminal.

3. The power supply device according to claim 2, characterized in that, The first PSU also includes a third interface circuit with the same structure as the first interface circuit. The first input side of the first interface circuit is used to connect to the first power supply, the third input side of the third interface circuit is used to connect to the second power supply, and the first output side of the first interface circuit is connected in parallel with the third output side of the third interface circuit.

4. The power supply device according to claim 2 or 3, characterized in that, The first interface circuit also includes a first diode, the positive terminal of which is connected to the first negative input terminal, the negative terminal of which is connected to the cathode of the first unidirectional thyristor, and the first diode is connected in parallel with the first capacitor.

5. The power supply device according to claim 4, characterized in that, The first diode is a transient voltage suppressor diode.

6. The power supply device according to claim 5, characterized in that, The first interface circuit further includes a first branch, which includes a first switching component and a first resistor connected in series. The first branch is connected in parallel with the first unidirectional thyristor. The first switching component is used to turn on the first branch and is also used to turn off the first branch when the first unidirectional thyristor is turned on.

7. The power supply device according to claim 6, characterized in that, The first interface circuit further includes a first varistor, the first end of which is connected to the anode of the first unidirectional thyristor and the first negative input terminal, respectively. The first end of the first varistor is also connected to the negative terminal of the first diode through the first switching component and the first resistor. The second end of the first varistor is also connected to the positive terminal of the first diode.

8. The power supply device according to claim 7, characterized in that, The first switching component includes any one of a diode, a thyristor, and a MOSFET.

9. The power supply device according to any one of claims 1 to 3, characterized in that, The first fuse includes a fuse wire.

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

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