Power supply circuit and electronic equipment

Abstract

The embodiment of the present invention discloses a power supply circuit and an electronic device. The power supply circuit includes an input connector, an output connector, a first step-down branch, a second step-down branch and a control branch; the first step-down branch is hot-pluggably connected to the input connector, and the first step-down branch is used to step down the first power supply voltage into a first output voltage, a first power supply voltage and a second power supply voltage; the second step-down branch is hot-pluggably connected to the input connector, the second step-down branch is connected to the first step-down branch, and the first power supply voltage and the second power supply voltage are used to supply power to the second step-down branch; the control branch is connected to the second step-down branch, and the control branch is used to control the second step-down branch to step down the second power supply voltage into a second output voltage; the output connector is used to output the first output voltage and the second output voltage; the first output voltage is less than the second output voltage. The technical solution provided in this embodiment reduces the line loss of the power supply circuit and improves the safety of the power supply circuit.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of power supply technology, and in particular to a power supply circuit and an electronic device. Background Art

[0002] With the development of data center technology and the continuous improvement of IT equipment computing power, the power density of a single cabinet in a data center has increased from a few kilowatts in the past to nearly ten kilowatts now, and cabinets with more than ten kilowatts have already appeared. As the power density of a single cabinet increases, if the entire cabinet continues to use a low-voltage DC busbar, the current will be as high as two or three thousand amperes, which will bring great challenges to the voltage drop, loss, structure, heat dissipation and price of the copper busbar.

[0003] If the bus current reaches two to three thousand amperes in a low-voltage DC architecture, the bus loss can reach more than kilowatts even with a contact resistance or line impedance as small as 1 milliohm. Existing power circuits use multiple power supply frames or multiple busbars to share current and reduce losses, which has the problem of large line losses.

[0004] The existing low-voltage power supply circuit has the problem of excessive current line loss when the power is high. Summary of the invention

[0005] The embodiments of the present invention provide a power supply circuit and an electronic device to solve the problem of excessive high current line loss in the existing low-voltage power supply circuit under high power conditions.

[0006] In order to achieve the above technical problems, the present invention adopts the following technical solutions:

[0007] An embodiment of the present invention provides a power supply circuit, including:

[0008] An input connector, an output connector, a first step-down branch, a second step-down branch, and a control branch;

[0009] The input connector is used to input a first power supply voltage and a second power supply voltage; the first power supply voltage is lower than the second power supply voltage;

[0010] The first step-down branch is hot-pluggably connected to the input connector, and the first step-down branch is used to step down the first power supply voltage into a first output voltage, a first supply voltage, and a second supply voltage;

[0011] The second step-down branch is hot-pluggably connected to the input connector, the second step-down branch is connected to the first step-down branch, and the first supply voltage and the second supply voltage are used to supply power to the second step-down branch;

[0012] The control branch is connected to the second step-down branch, and the control branch is used to control the second step-down branch to step down the second power supply voltage into a second output voltage;

[0013] The output connector is used to output the first output voltage and the second output voltage; the first output voltage is lower than the second output voltage.

[0014] Optionally, the input connector includes a first pin and a second pin;

[0015] The length of the first pin is greater than the length of the second pin;

[0016] The first pin is used for hot-plugging connection with the input end of the first step-down branch, and the second pin is used for hot-plugging connection with the input end of the second step-down branch;

[0017] The input connector is used to hot-plug the second step-down branch to the second pin after the first step-down branch is hot-plugged to the first pin.

[0018] Optionally, the first voltage reduction branch includes:

[0019] a first surge suppressor, the first surge suppressor being connected to the input connector, and the first surge suppressor being used to suppress a surge signal of the first step-down branch;

[0020] an isolation step-down module, the isolation step-down module being connected to the first surge suppressor and the output connector respectively, the isolation step-down module being used to step down the first power supply voltage into a first output voltage, and output the first output voltage to the output connector;

[0021] A step-down conversion module, wherein the step-down conversion module is connected to the isolation step-down module; the step-down conversion module is used to step down the first output voltage into the first supply voltage and the second supply voltage respectively.

[0022] Optionally, the second voltage reduction branch includes:

[0023] a second surge suppressor, wherein the second surge suppressor is connected to the input connector, the second surge suppressor is connected to the buck conversion module, the first power supply voltage and the second power supply voltage output by the buck conversion module are used to supply power to the second surge suppressor; the input connector is used to transmit the second power supply voltage to the second surge suppressor; the second surge suppressor is used to suppress the surge signal of the second buck branch;

[0024] N sub-step-down branches, the N sub-step-down branches are connected in parallel between the second surge suppressor and the output connector, N is a positive integer greater than or equal to 1; the sub-step-down branches are used to step down the second power supply voltage into a second output voltage.

[0025] Optionally, each of the sub-step-down branches includes:

[0026] a fixed ratio converter, the fixed ratio converter being connected to the second surge suppressor; the fixed ratio converter being used to step down and isolate the second power supply voltage and output a first intermediate voltage; the amplitude of the first intermediate voltage being equal to the amplitude of the second output voltage;

[0027] An output monitor is connected between the fixed ratio converter and the output connector, and is used to detect the current, voltage and power of the output connector and support 10V to 80V hot-swap control of the PM Bus interface.

[0028] Optionally, each of the sub-step-down branches further includes:

[0029] An ideal diode controller is connected to the output monitor, and includes a load-side switch for providing reverse input protection and reverse current shutdown.

[0030] Optionally, the control branch includes:

[0031] A controller, the controller is connected to the fixed ratio converter, and the controller is used to control an enable terminal of the fixed ratio converter;

[0032] The controller is connected to the output monitor, and is used to receive current, voltage and power signals detected by the output monitor, and control the PM BUS interface of the output monitor to conduct and output the first intermediate voltage according to the current, voltage and power signals.

[0033] Optionally, the controller is connected to the ideal diode controller, and the controller is used to control the load-side switch controlled by the ideal diode to turn off, and after the output voltage of the fixed ratio converter is stabilized, control the load-side switch of the ideal diode controller to be forward-conducted;

[0034] The controller is connected to the output connector, and is used to control the ideal diode controller to be reversely turned off according to the reverse current of the output connector.

[0035] Optionally, the fixed ratio converter comprises an 8:1 power brick, and the 8:1 power brick is used to convert the second power supply voltage into a third power supply voltage;

[0036] The output connector includes a power connector and a signal connector, the power connector is respectively connected to the isolation buck module of the first buck branch and the ideal diode controller of the second buck branch, and the power connector is used to supply power to the load and the controller; the signal connector is connected to the controller, and the signal connector is used to communicate with the controller;

[0037] The first power supply voltage of the input connector is 48V;

[0038] The second power supply voltage of the input connector is 380V;

[0039] The first output voltage of the output connector is 12V;

[0040] The second output voltage of the output connector is 48V.

[0041] According to another aspect of the present invention, this embodiment provides an electronic device, including: the power supply circuit provided by any item of the first aspect.

[0042] The power supply circuit provided by the embodiment of the present invention inputs the first power supply voltage and the second power supply voltage through the input connector; the first step-down branch is hot-pluggably connected to the input connector, the second step-down branch is hot-pluggably connected to the input connector, and the second step-down branch is connected to the first step-down branch. The first step-down branch steps down the first power supply voltage into a first output voltage, a first supply voltage, and a second supply voltage. The first supply voltage and the second supply voltage are used to supply power to the second step-down branch. The second step-down branch is controlled by the control branch to step down the second power supply voltage into a second output voltage. The output connector is used to output a first output voltage with a lower voltage and a second output voltage with a higher voltage. By combining the two-way power supply input of low voltage and high voltage, the power supply circuit is reduced, which not only avoids the line loss of the low-voltage busbar architecture with a single first step-down branch under high current, but also avoids the risk of hot-plugging instantaneous ignition of the high-voltage busbar architecture with a single second step-down branch. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0044] Figure 1 is a schematic diagram of the structure of a power supply circuit provided by an embodiment of the present invention;

[0045] Figure 2 is a structural schematic diagram of another power supply circuit provided by an embodiment of the present invention;

[0046] Figure 3 is a structural schematic diagram of another power supply circuit provided by an embodiment of the present invention;

[0047] Figure 4 is a structural schematic diagram of another power supply circuit provided by an embodiment of the present invention;

[0048] Figure 5 It is a structural schematic diagram of another power supply circuit provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0049] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0050] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0051] Based on the above technical problems, this embodiment proposes the following solutions:

[0052] Figure 1 is a schematic diagram of a power supply circuit provided by an embodiment of the present invention. Figure 1The power supply circuit provided by the embodiment of the present invention includes: an input connector 1, an output connector 2, a first step-down branch 3, a second step-down branch 4 and a control branch 5; the input connector 1 is used to input a first power supply voltage and a second power supply voltage; the first power supply voltage is less than the second power supply voltage; the first step-down branch 3 is hot-pluggably connected to the input connector 1, and the first step-down branch 3 is used to step down the first power supply voltage into a first output voltage, a first power supply voltage and a second power supply voltage; the second step-down branch 4 is hot-pluggably connected to the input connector 1, the second step-down branch 4 is connected to the first step-down branch 3, and the first power supply voltage and the second power supply voltage are used to supply power to the second step-down branch 4; the control branch 5 is connected to the second step-down branch 4, and the control branch 5 is used to control the second step-down branch 4 to step down the second power supply voltage into a second output voltage; the output connector 2 is used to output the first output voltage and the second output voltage; the first output voltage is less than the second output voltage.

[0053] Specifically, the input connector 1 supports dual power input. The input connector 1 can support the common input of the first power supply voltage and the second power supply voltage. The first power supply voltage can be set, for example, 48V, and the second power supply voltage can be set, for example, 380V. The first power supply voltage with a lower voltage can be used as a low-power auxiliary power supply. The second power supply voltage with a higher voltage can be used as a high-power working power supply.

[0054] The first step-down branch 3 is a low-voltage power supply branch. The first step-down branch 3 steps down the first power supply voltage, thereby stepping down the first power supply voltage into a first output voltage. The first output voltage is then further stepped down to generate a first supply voltage and a second supply voltage. The first supply voltage and the second supply voltage are used to power the second step-down branch 4. The first output voltage is output through the output connector 2.

[0055] The second step-down branch 4 is a high-voltage power supply branch. The second step-down branch 4 steps down the second power supply voltage to generate a second output voltage. The control branch 5 can control the second step-down branch 4 to enable. The second step-down branch 4 is turned on according to the control signal of the control branch 5, which improves the safety and reliability of the second step-down branch 4.

[0056] By setting the first step-down branch 3 to supply power to the second step-down branch 4, the second step-down branch 4 works after the first step-down branch 3, so that the second step-down branch 4 can be hot-plugged and then powered on by the first step-down branch 3. Therefore, through the low-voltage and high-voltage power inputs and the combination of two hot-plug input connectors 1, the line loss of a single low-voltage busbar architecture under high current and the risk of instantaneous ignition of a single high-voltage busbar architecture during hot plugging can be avoided.

[0057] The power supply circuit provided in this embodiment inputs the first power supply voltage and the second power supply voltage through the input connector 1; the first step-down branch 3 is hot-pluggably connected to the input connector 1, the second step-down branch 4 is hot-pluggably connected to the input connector 1, and the second step-down branch 4 is connected to the first step-down branch 3. The first step-down branch 3 steps down the first power supply voltage into a first output voltage, a first power supply voltage, and a second power supply voltage. The first power supply voltage and the second power supply voltage are used to supply power to the second step-down branch 4. The second step-down branch 4 is controlled by the control branch 5 to step down the second power supply voltage into a second output voltage. The output connector 2 is used to output a first output voltage with a lower voltage and a second output voltage with a higher voltage. Through the combination of low-voltage and high-voltage power inputs and two hot-pluggable input connectors 1, the power supply circuit is reduced, which not only avoids the line loss of a single low-voltage bus architecture under high current, but also avoids the risk of hot-plugging and instantaneous ignition of a single high-voltage bus architecture.

[0058] In addition, by adopting the busbar structure of high-voltage direct current, the power expansion capacity is expected to be upgraded to a single cabinet density of 30-40KW, which can be realized in the long-term planning. Therefore, the high-voltage direct current busbar structure has great potential in increasing the power density of a single cabinet. By adopting the busbar structure of high-voltage direct current, if the voltage is increased by N times and the current is reduced to 1 / N of the original, the busbar loss is reduced to 1 / N of the original. 2 , which can greatly reduce busbar loss and heating risks.

[0059] Optionally, the input connector 1 includes a first pin and a second pin; the length of the first pin is greater than the length of the second pin; the first pin is used for hot-plug connection with the input end of the first step-down branch 3, and the second pin is used for hot-plug connection with the input end of the second step-down branch 4; the input connector 1 is used to hot-plug connection the second step-down branch 4 with the second pin after the first step-down branch 3 is hot-plug connected to the first pin.

[0060] Specifically, input connector 1, select or customize a connector with a long and short pin design, the long pin is low voltage input, 48V is selected in this example, and the short pin is high voltage input, 380V is selected in this example. The 48V low voltage power supply hot plug and surge suppressor circuit is relatively mature, used as a low power auxiliary power supply, to power the MCU / CPLD, and to provide auxiliary power for the high voltage hot plug controller, and the 380V high voltage power supply is inserted later as a high power working power supply. Through the combination of low voltage and high voltage power input and two hot plug controllers, the line loss under high current of a single low voltage bus architecture and the risk of instantaneous sparking during hot plugging of a single high voltage bus architecture are avoided.

[0061] It should be noted that the separate low-voltage busbar architecture refers to a situation where the power supply circuit does not include the second step-down branch, and the separate high-voltage busbar architecture refers to a situation where the power supply circuit does not include the first step-down branch.

[0062] Optionally, based on the above embodiments, Figure 2 is a schematic diagram of the structure of another power supply circuit provided by an embodiment of the present invention. Figure 2 The first step-down branch 3 may include: a first surge suppressor 31, which is connected to the input connector 1 and is used to suppress the surge signal of the first step-down branch 3; an isolation step-down module 32, which is respectively connected to the first surge suppressor 31 and the output connector 2, and is used to step down the first power supply voltage into a first output voltage, and output the first output voltage to the output connector 2; a step-down conversion module 33, which is connected to the isolation step-down module 32; the step-down conversion module 33 is used to step down the first output voltage into the first power supply voltage and the second power supply voltage respectively.

[0063] Specifically, the first surge suppressor 31 can adopt a 48V surge suppressor. The isolation buck module 32 plays the role of isolation and voltage reduction. The isolation buck module 32 steps down the first power supply voltage to a first output voltage, such as 12V. The buck conversion module 33 may include a DC-DC module to step down the first output voltage to a first power supply voltage, such as 5V. The buck conversion module 33 may also include an LDO (low-dropout regulator) module to step down the first output voltage to a second power supply voltage, such as 3.3V.

[0064] Optionally, based on the above embodiments, Figure 3 is a schematic diagram of the structure of another power supply circuit provided by an embodiment of the present invention. Figure 3 The second step-down branch 4 may include: a second surge suppressor 41, the second surge suppressor 41 is connected to the input connector 1, the second surge suppressor 41 is connected to the step-down conversion module 33, the first power supply voltage and the second power supply voltage output by the step-down conversion module 33 are used to supply power to the second surge suppressor 41; the input connector 1 is used to transmit the second power supply voltage to the second surge suppressor 41; the second surge suppressor 41 is used to suppress the surge signal of the second step-down branch 4; N sub-step-down branches 42, the N sub-step-down branches 42 are connected in parallel between the second surge suppressor 41 and the output connector 2, N is a positive integer greater than or equal to 1; the sub-step-down branch 42 is used to step down the second power supply voltage into a second output voltage.

[0065] Specifically, the second surge suppressor 41 can be a high-voltage surge suppressor for high-voltage direct current (HVDC). The second surge suppressor 41 is powered by the first power supply voltage and the second power supply voltage output by the first step-down branch 3. The second surge suppressor 41 is used to suppress the surge signal in the second step-down branch 4 where the second power supply voltage is located. The first surge suppressor 31 can be a 380V surge suppressor.

[0066] The N sub-step-down branches 42 are mutually redundant. The N sub-step-down branches 42 are used to step down the second power supply voltage passing through the second surge suppressor 41 according to the control signal of the control branch 5, generate a second output voltage, and transmit it to the output connector 2. The second output voltage is, for example, 48 V. The output connector 2 can support the output of the first output voltage and the second output voltage.

[0067] Optionally, based on the above embodiments, Figure 4 is a schematic diagram of the structure of another power supply circuit provided by an embodiment of the present invention. Figure 4 Each of the sub-step-down branches 42 includes: a fixed ratio converter 321, which is connected to the second surge suppressor 41; the fixed ratio converter 321 is used to step down and isolate the second power supply voltage, and output a first intermediate voltage; the amplitude of the first intermediate voltage is equal to the amplitude of the second output voltage; an output monitor 322, which is connected between the fixed ratio converter 321 and the output connector 2, and is used to detect the current, voltage and power of the output connector 2, and supports 10V to 80V hot-swap control of the PM BUS bus interface.

[0068] Specifically, PM Bus (Power Management Bus) is an open standard digital power management protocol. Communication with power converters or other devices can be facilitated by defining transmission and physical interfaces and command languages. Fixed ratio converter 321 can provide higher efficiency than voltage regulator converter in a smaller size. Output monitor 322 has the function of collecting current, voltage and power of the load connected to output connector 2, and supports PM BUS bus interface 10V to 80V hot plug control, which is convenient for supporting PM BUS bus and convenient for input and output power monitoring and other functions.

[0069] Optionally, based on the above embodiments, Figure 5 is a schematic diagram of the structure of another power supply circuit provided by an embodiment of the present invention. Figure 5Each of the sub-buckling branches 42 also includes: an ideal diode controller 323, wherein the ideal diode controller 323 is connected to the output monitor 322, and the ideal diode controller 323 includes a load-side switch for providing reverse input protection and reverse current shutdown.

[0070] Specifically, the ideal diode controller 323 is used for input undervoltage or overvoltage protection. When the output of the fixed ratio converter 321 is stable, the control branch 5 outputs a conduction control signal to the ideal diode controller 323. The ideal diode controller 323 is turned on, and the conduction voltage drop is very small. When there is a reverse current input to the output connector 2, the ideal diode controller 323 can be reversely turned off quickly.

[0071] Optionally, based on the above embodiments, continue to refer to Figure 5 The control branch 5 includes: a controller 51, which is connected to the fixed ratio converter 321 and is used to control the enable terminal of the fixed ratio converter 321; the controller is connected to the output monitor 322 and is used to receive the current, voltage and power signals detected by the output monitor 322, and control the PM Bus interface of the output monitor 322 to conduct and output the first intermediate voltage according to the current, voltage and power signals.

[0072] Specifically, the controller may be an MCU (microcontroller unit) or a CPLD (complex programmable logic device). The controller is used to control the enable terminal of the fixed ratio converter 321. When the fixed ratio converter 321 receives the enable signal of the controller, the fixed ratio converter 321 steps down the second power supply voltage to generate the first intermediate voltage. Exemplarily, the first intermediate voltage may be 48V.

[0073] Optionally, based on the above embodiments, continue to refer to Figure 5 The controller is connected to the ideal diode controller 323, and the controller is used to control the load-side switch controlled by the ideal diode to be turned off. After the output voltage of the fixed ratio converter 321 is stabilized, the load-side switch of the ideal diode controller 323 is controlled to be forward-conducted; the controller is connected to the output connector 2, and the controller is used to control the reverse shutdown of the ideal diode controller 323 according to the reverse current of the output connector 2.

[0074] Specifically, the output connector 2 is used to connect the load. The ideal diode controller 323 includes a load-side switch connected between the monitor and the output connector 2. In the initial state, the controller controls the load-side switch controlled by the ideal diode to turn off. After the first step-down branch 3 outputs a stable first power supply voltage and a second power supply voltage, the output voltage of the fixed ratio converter 321 of the second step-down branch 4 is also stable. The controller controls the load-side switch of the ideal diode controller 323 to be forward-conducted. This arrangement avoids the risk of ignition at the moment of hot plugging of the second step-down branch 4 with a higher voltage, and enables the second step-down branch 4 to be connected to the output connector 2 through the turned-on ideal diode controller 323, thereby reducing line losses.

[0075] On the other hand, the controller is connected to the output connector 2 , and can receive a reverse current signal from the load side of the output connector 2 , and control the ideal diode controller 323 to quickly reversely shut down according to the reverse current of the output connector 2 .

[0076] Optionally, based on the above embodiments, continue to refer to Figure 5 The fixed ratio converter 321 includes an 8:1 power brick, and the 8:1 power brick is used to convert the second power supply voltage into a third power supply voltage; the output connector 2 includes a power connector and a signal connector, and the power connector is respectively connected to the isolation buck module 32 of the first buck branch 3 and the ideal diode controller 323 of the second buck branch 4, and the power connector is used to supply power to the load and the controller; the signal connector is connected to the controller, and the signal connector is used to communicate with the controller.

[0077] Specifically, the fixed ratio converter 321 uses an 8:1 power brick to step down the second power supply voltage 380V to a second output voltage of 48V. The 8:1 power brick can provide higher efficiency than the voltage regulator converter in a smaller size. The output connector 2 may include a power connector and a signal connector, which is connected to the first step-down branch 3 and the second step-down branch 4 through the power connector and supplies power to the load. The signal connector can be connected to a controller, or to a remote control unit to realize functions such as remote power control and remote power on / off.

[0078] Exemplarily, the first power supply voltage of the input connector 1 may be 48V. The second power supply voltage of the input connector 1 may be 380V. The first output voltage of the output connector 2 may be 12V. The second output voltage of the output connector 2 may be 48V.

[0079] This embodiment provides an electronic device. The electronic device provided by this embodiment includes the power supply circuit provided by any of the above embodiments, and has the beneficial effects of the power supply circuit provided by any of the above embodiments, which will not be described in detail here.

[0080] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A power supply circuit, characterized in that: include: An input connector, an output connector, a first step-down branch, a second step-down branch, and a control branch; The input connector is used to input a first power supply voltage and a second power supply voltage; the first power supply voltage is lower than the second power supply voltage; The first step-down branch is hot-pluggably connected to the input connector, and the first step-down branch is used to step down the first power supply voltage into a first output voltage, a first supply voltage, and a second supply voltage; The second step-down branch is hot-pluggably connected to the input connector, the second step-down branch is connected to the first step-down branch, and the first supply voltage and the second supply voltage are used to supply power to the second step-down branch; The control branch is connected to the second step-down branch, and the control branch is used to control the second step-down branch to step down the second power supply voltage into a second output voltage; The output connector is used to output the first output voltage and the second output voltage; the first output voltage is lower than the second output voltage.

2. The power supply circuit according to claim 1, characterized in that: The input connector includes a first pin and a second pin; The length of the first pin is greater than the length of the second pin; The first pin is used for hot-plugging connection with the input end of the first step-down branch, and the second pin is used for hot-plugging connection with the input end of the second step-down branch; The input connector is used to hot-plug the second step-down branch to the second pin after the first step-down branch is hot-plugged to the first pin.

3. The power supply circuit according to claim 1, characterized in that: The first step-down branch comprises: a first surge suppressor, the first surge suppressor being connected to the input connector, and the first surge suppressor being used to suppress a surge signal of the first step-down branch; an isolation step-down module, the isolation step-down module being connected to the first surge suppressor and the output connector respectively, the isolation step-down module being used to step down the first power supply voltage into a first output voltage, and output the first output voltage to the output connector; A step-down conversion module, wherein the step-down conversion module is connected to the isolation step-down module; the step-down conversion module is used to step down the first output voltage into the first supply voltage and the second supply voltage respectively.

4. The power supply circuit according to claim 3, characterized in that: The second step-down branch comprises: a second surge suppressor, wherein the second surge suppressor is connected to the input connector, the second surge suppressor is connected to the buck conversion module, the first power supply voltage and the second power supply voltage output by the buck conversion module are used to supply power to the second surge suppressor; the input connector is used to transmit the second power supply voltage to the second surge suppressor; the second surge suppressor is used to suppress the surge signal of the second buck branch; N sub-step-down branches, the N sub-step-down branches are connected in parallel between the second surge suppressor and the output connector, N is a positive integer greater than or equal to 1; the sub-step-down branches are used to step down the second power supply voltage into a second output voltage.

5. The power supply circuit according to claim 4, characterized in that: Each of the sub-step-down branches comprises: a fixed ratio converter, the fixed ratio converter being connected to the second surge suppressor; the fixed ratio converter being used to step down and isolate the second power supply voltage and output a first intermediate voltage; the amplitude of the first intermediate voltage being equal to the amplitude of the second output voltage; An output monitor is connected between the fixed ratio converter and the output connector, and is used to detect the current, voltage and power of the output connector and support 10V to 80V hot-swap control of the PM Bus interface.

6. The power supply circuit according to claim 5, characterized in that: Each of the sub-step-down branches further includes: An ideal diode controller is connected to the output monitor, and includes a load-side switch for providing reverse input protection and reverse current shutdown.

7. The power supply circuit according to claim 6, characterized in that: The control branch comprises: A controller, the controller is connected to the fixed ratio converter, and the controller is used to control an enable terminal of the fixed ratio converter; The controller is connected to the output monitor, and is used to receive current, voltage and power signals detected by the output monitor, and control the PM BUS interface of the output monitor to conduct and output the first intermediate voltage according to the current, voltage and power signals.

8. The power supply circuit according to claim 7, characterized in that: The controller is connected to the ideal diode controller, and the controller is used to control the load-side switch controlled by the ideal diode to turn off, and after the output voltage of the fixed ratio converter is stabilized, control the load-side switch of the ideal diode controller to conduct forward; The controller is connected to the output connector, and is used to control the ideal diode controller to be reversely turned off according to the reverse current of the output connector.

9. The power supply circuit according to claim 6, characterized in that: The fixed ratio converter includes an 8:1 power brick, the 8:1 power brick is used to convert the second power supply voltage to a third supply voltage; The output connector includes a power connector and a signal connector, the power connector is respectively connected to the isolation buck module of the first buck branch and the ideal diode controller of the second buck branch, and the power connector is used to supply power to the load and the controller; the signal connector is connected to the controller, and the signal connector is used to communicate with the controller; The first power supply voltage of the input connector is 48V; The second power supply voltage of the input connector is 380V; The first output voltage of the output connector is 12V; The second output voltage of the output connector is 48V.

10. An electronic device, characterized in that: include: A power supply circuit as claimed in any one of claims 1 to 9.

Images