Power supply circuit and power supply system

Abstract

The invention relates to the technical field of power supplies, and discloses a power supply circuit and a power supply system, the power supply circuit comprises a voltage conversion circuit and a hot plug and slow start control module, a first input end of the voltage conversion circuit is connected to a positive pole direct current voltage through the hot plug and slow start control module, and a second input end of the voltage conversion circuit is connected to a negative pole direct current voltage; the first output end and the second output end of the voltage conversion circuit are connected with a golden finger connector of the mainboard through golden fingers; the voltage conversion circuit is used for converting the direct current into power supply voltage of the golden finger; the hot plug and slow start control module is located on the mainboard; when the voltage conversion circuit is pulled out or inserted, the hot plug and slow start control module is disconnected; and when the voltage conversion circuit is inserted, the hot plug and slow start control module is closed, so that safe and reliable electrified hot plug and slow start control of the power supply circuit is realized, the maintainability of the power supply circuit is realized, normal work of the system is not influenced, and the safety of operators is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of power supplies, and in particular to a power supply and a power supply system. Background Art

[0002] With the development of server technology, the power module, as the most critical power supply unit of the server system, has higher and higher requirements for online maintainability. As a key indicator, uninterruptible power supply and online hot plugging have become an inevitable trend.

[0003] High-voltage DC power supply architecture is one of the important trends in the development of data center power supply structure. The DC bus of the high-voltage DC power supply architecture is directly connected to the power supply circuit. When the main circuit is energized, direct plugging and unplugging is very dangerous, which may cause PSU ignition, damage, electric shock to operators, and other risks. Summary of the invention

[0004] In view of this, the present invention provides a power supply circuit and a power supply system to solve the problem of how to improve the safety during hot plugging of power supplies.

[0005] In the first aspect, the present invention provides a power supply circuit, including: a voltage conversion circuit, a hot plug and soft start control module, wherein the first input end of the voltage conversion circuit is connected to a positive DC voltage through the hot plug and soft start control module, the second input end of the voltage conversion circuit is connected to a negative DC voltage, and the first output end and the second output end of the voltage conversion circuit are connected to a gold finger connector of a mainboard through a gold finger; the voltage conversion circuit is used to convert DC power into a power supply voltage of the gold finger; the hot plug and soft start control module is located on the mainboard; when the voltage conversion circuit is unplugged or inserted, the hot plug and soft start control module is disconnected; when the voltage conversion circuit is inserted, the hot plug and soft start control module is closed.

[0006] When the voltage conversion circuit is unplugged or inserted, the hot plug and slow start control module is disconnected; when the voltage conversion circuit is inserted, the hot plug and slow start control module is closed, thereby realizing safe and reliable live hot plug and slow start control of the power supply circuit, realizing the maintainability of the power supply circuit without affecting the normal operation of the system, and ensuring the safety of the operator.

[0007] In an optional embodiment, the hot plug and soft start control module includes: a first power switch device and a first diode, wherein the first end of the first power switch device is connected to the first input end of the voltage conversion circuit, and the second end of the first power switch device is connected to the positive DC voltage; the first diode is reversely connected in parallel with the first power switch device.

[0008] In an optional embodiment, the voltage conversion circuit includes: a full-bridge circuit, a transformer, a rectifier circuit, a filter circuit, a sampling resistor and an anti-reverse circuit, wherein the first DC end of the full-bridge circuit is connected to the positive DC voltage through a hot plug and soft start control module, the second DC end of the full-bridge circuit is connected to the negative DC voltage, the first AC end and the second AC end of the full-bridge circuit are connected to the primary side of the transformer; the first AC end and the second AC end of the rectifier circuit are connected to the secondary side of the transformer, the first DC end of the rectifier circuit is connected to the first end of the filter circuit and the first end of the sampling resistor, the second DC end of the rectifier circuit is connected to the second end of the filter circuit and then grounded; the first end of the anti-reverse circuit is connected to the second end of the sampling resistor, the second end of the anti-reverse circuit is connected to the gold finger; the second end of the filter circuit is connected to the gold finger.

[0009] In an optional embodiment, the full-bridge circuit includes: a first capacitor, a second power switch device, a third power switch device, a fourth power switch device, and a fifth power switch device, wherein the first end of the second power switch device is connected to the first end of the fourth power switch device and the first end of the first capacitor, and the first end of the second power switch device is also connected to the positive DC voltage through the hot plug and soft start control module, the second end of the second power switch device is connected to the first end of the third power switch device and the first end of the primary side of the transformer; the second end of the third power switch device is connected to the second end of the first capacitor and the second end of the fifth power switch device and then grounded, and the second end of the third power switch device inputs a negative DC voltage; the second end of the fourth power switch device is connected to the first end of the fifth power switch device and the second end of the primary side of the transformer.

[0010] In an optional embodiment, the rectifier circuit includes: a sixth power switch device, a seventh power switch device, an eighth power switch device and a ninth power switch device, wherein the first end of the sixth power switch device is connected to the first end of the eighth power switch device, the first end of the filter circuit, and the first end of the sampling resistor, and the second end of the sixth power switch device is connected to the first end of the secondary side of the transformer and the first end of the seventh power switch device; the second end of the seventh power switch device is connected to the second end of the filter circuit and the second end of the ninth power switch device and then grounded; the second end of the eighth power switch device is connected to the first end of the ninth power switch device and the second end of the secondary side of the transformer.

[0011] In an optional implementation, the filter circuit includes: a plurality of filter capacitors connected in parallel.

[0012] In an optional embodiment, the anti-reverse circuit includes: a tenth power switch device and a second diode, wherein the first end of the tenth power switch device is connected to the second end of the sampling resistor, and the second end of the tenth power switch device is connected to the gold finger; the second diode is connected in reverse parallel to the tenth power switch device.

[0013] In an optional implementation, the power supply circuit further includes: a fuse, wherein the first input end of the voltage conversion circuit is connected to the positive DC voltage through the fuse, the hot plug and the soft start control module in sequence.

[0014] In an optional embodiment, the voltage conversion circuit includes: a feedback pin, which is the shortest pin of the voltage conversion circuit, and the feedback pin is grounded, and the power supply circuit also includes: an in-place detection circuit, wherein when the voltage conversion circuit is inserted, that is, the feedback pin is connected to the access point of the in-place detection circuit, the in-place detection circuit outputs an insertion signal, and the insertion signal is used to control the hot plug and soft start control module to close; when the voltage conversion circuit is unplugged, that is, the feedback pin is cut out of the access point of the in-place detection circuit, the in-place detection circuit outputs a pull-out signal, and the pull-out signal is used to control the hot plug and soft start control module to disconnect.

[0015] In order to realize safe hot-swap operation of the power supply circuit, the present invention designs a DC-DC circuit containing a hot-swap and soft-start control module. A MOSFET or a relay is used as a main switch, and a DSP in-place detection circuit is used to realize the on-off control of the 400Vdc bus and the module power supply. Under normal working conditions of the PSU, the safe unplugging and safe plugging operations of the module power supply can be realized respectively.

[0016] In a second aspect, the present invention provides a power supply system, comprising: a plurality of power supply circuits according to the first aspect and any optional implementation manner thereof. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 is a composition diagram of a power supply circuit according to an embodiment of the present invention;

[0019] Figure 2 is a composition diagram of another power supply circuit according to an embodiment of the present invention;

[0020] Figure 3 is a composition diagram of another power supply circuit according to an embodiment of the present invention;

[0021] Figure 4 is a specific circuit structure diagram of a power supply circuit according to an embodiment of the present invention;

[0022] Figure 5is a composition diagram of another power supply circuit according to an embodiment of the present invention;

[0023] Figure 6 is a specific circuit structure diagram of a bit detection circuit according to an embodiment of the present invention;

[0024] Figure 7 is a composition diagram of a power supply system according to an embodiment of the present invention;

[0025] Figure 8 is an exemplary diagram of a power supply system according to an embodiment of the present invention;

[0026] Fig. 9 is a specific circuit structure diagram of a power supply system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution 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 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 those skilled in the art without creative work are within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can also be the internal connection of two components, it can be a wireless connection, or it can be a wired connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0031] The high-voltage DC power supply architecture only supports high-voltage DC (HVDC) input, with a typical value of 400Vdc. The main power part is only a single-stage DC-DC conversion with high conversion efficiency, up to 98.5%. At the same time, under the standard width of 2*73.5mm CRPS, the N+1 module redundant power supply structure is adopted to further improve the power level and power density of the PSU power supply. How to achieve safe and reliable hot-swap and soft-start control of the module power supply under 400Vdc input conditions, achieve the maintainability of the module power supply without affecting the normal operation of the system, and ensure the safety of operators is an important design goal under the Powershelf power supply structure.

[0032] The current Servershelf power supply architecture cannot realize hot-swap of N+1 module power supply, and it is not easy to maintain. Because the 400Vdc DC bus is directly connected to the module power supply, it is very dangerous to directly plug and unplug when the main circuit is energized, which may cause the PSU to ignite, damage, electric shock to operators, etc.

[0033] In this embodiment, a power supply circuit is provided. Figure 1 As shown, it includes: a voltage conversion circuit 1, a hot plug and soft start control module 2.

[0034] like Figure 1 As shown, the first input end of the voltage conversion circuit 1 is connected to the positive DC voltage VBUS+ through the hot plug and soft start control module 2, the second input end of the voltage conversion circuit 1 is connected to the negative DC voltage VBUS-, and the first output end and the second output end of the voltage conversion circuit 1 are connected to the gold finger connector of the mainboard through the gold finger; the voltage conversion circuit 1 is used to convert DC power into the power supply voltage of the gold finger; the hot plug and soft start control module 2 is located on the mainboard.

[0035] Specifically, the voltage conversion circuit 1 can convert the input DC voltage into a power supply voltage of corresponding amplitude, and supply power to the mainboard through the gold finger.

[0036] Specifically, during power supply, in order to stabilize the output power supply voltage, adaptive adjustment of the voltage conversion circuit 1 can be implemented based on a closed-loop control method, wherein the closed-loop control method is not limited to feedback control methods such as DC voltage and DC current.

[0037] Optionally, the voltage conversion circuit 1 may be an AC-DC circuit or a DC-DC circuit, wherein the DC-DC circuit may be a BUCK circuit or a BOOST circuit, and the voltage conversion circuit 1 may be composed of AC-DC and DC-DC circuits, such as a switching power supply, etc., which is not limited here.

[0038] Specifically, the hot plug and slow start control module 2 is located on the main board. It can be understood that the first end of the hot plug and slow start control module 2 is fixedly input with a positive DC voltage, and the negative DC voltage is also fixedly input. The second end of the hot plug and slow start control module 2 is fixed to the main board and an interface is led out at the same time.

[0039] To implement safe hot swapping, the following operations are required:

[0040] (1) When the voltage conversion circuit 1 is unplugged or plugged in, the hot plug and soft start control module 2 is disconnected.

[0041] Specifically, when the DC voltage is working normally, if it is necessary to unplug the voltage conversion circuit 1, the hot plug and soft start control module 2 is disconnected to disconnect the power supply circuit from the DC voltage, so that the power supply circuit can be unplugged safely without power on; if it is necessary to insert the voltage conversion circuit 1, the hot plug and soft start control module 2 is disconnected to disconnect the power supply circuit from the DC voltage, so that the power supply circuit can be unplugged safely without power on.

[0042] (2) After the voltage conversion circuit 1 is inserted, the hot plug and soft start control module 2 is closed.

[0043] Specifically, if the voltage conversion circuit 1 needs to be inserted, the hot-swap and soft-start control module 2 is disconnected to disconnect the power supply circuit from the DC voltage, so that the power supply circuit can be inserted safely without power. Afterwards, the hot-swap and soft-start control module 2 is closed, the DC voltage is connected, and normal startup is achieved.

[0044] In some optional embodiments, such as Figure 2 As shown, the hot-swap and soft-start control module 2 includes: a first power switch device Q1 and a first diode D1.

[0045] like Figure 2 As shown, the first end of the first power switch device Q1 is connected to the first input end of the voltage conversion circuit 1, and the second end of the first power switch device Q1 is connected to the positive DC voltage; the first diode D1 is connected in reverse parallel to the first power switch device Q1.

[0046] Optionally, Figure 2 The first power switch device Q1 is a MOS tube, the source of which is connected to the first input end of the voltage conversion circuit 1, the drain of which is connected to the positive DC voltage, and the gate of which is input with a control signal.

[0047] Specifically, when the voltage conversion circuit 1 is unplugged or plugged in, the first power switch device Q1 is disconnected; when the voltage conversion circuit 1 is plugged in, the first power switch device Q1 is closed.

[0048] In some optional embodiments, such as Figure 3 As shown, the voltage conversion circuit 1 includes: a full-bridge circuit 11, a transformer 12, a rectifier circuit 13, a filter circuit 14, a sampling resistor R1 and an anti-reverse circuit 15.

[0049] like Figure 3 As shown, the first DC end of the full-bridge circuit 11 is connected to the positive DC voltage through the hot plug and soft start control module 2, the second DC end of the full-bridge circuit 11 is connected to the negative DC voltage, and the first AC end and the second AC end of the full-bridge circuit 11 are connected to the primary side of the transformer 12.

[0050] Specifically, the full-bridge circuit 11 is actually an inverter circuit, which is used to convert direct current into alternating current, and the alternating current is input into the transformer 12 .

[0051] like Figure 3 As shown, the first AC end and the second AC end of the rectifier circuit 13 are connected to the secondary side of the transformer 12, the first DC end of the rectifier circuit 13 is connected to the first end of the filter circuit 14 and the first end of the sampling resistor R1, and the second DC end of the rectifier circuit 13 is connected to the second end of the filter circuit 14 and then grounded. The rectifier circuit 13 is used to convert AC power into DC power.

[0052] Specifically, Figure 3 In the figure, the transformer 12 is actually a resonant circuit, and the equivalent circuit of the resonant circuit can be an LLC circuit, but this is only an example and is not intended to be limiting.

[0053] like Figure 3 As shown, the first end of the anti-reverse circuit 15 is connected to the second end of the sampling resistor R1, and the second end of the anti-reverse circuit 15 is connected to the gold finger.

[0054] Specifically, Figure 3 In the figure, the electric energy flows from left to right, that is, from the voltage conversion circuit 1 to the gold finger. Therefore, in order to prevent the current from flowing in the opposite direction or backflowing, a unidirectional conductive anti-reverse circuit 15 is provided.

[0055] like Figure 3 As shown, the second end of the filter circuit 14 is connected to the gold finger.

[0056] Specifically, Figure 3 The filter circuit 14 can be an LC filter circuit, an RLC filter circuit, etc. The filter circuit 14 is used to filter out noise in the power supply voltage to achieve stable power supply.

[0057] Optionally, in Figure 3 A variety of protection circuits may also be provided in the voltage conversion circuit 1, for example, overvoltage, overcurrent, overtemperature, short circuit, open circuit, etc., to further improve the safety and reliability of power supply.

[0058] Optionally, in Figure 3 In the voltage conversion circuit 1, a voltage stabilization circuit can be connected in the later stage to further improve the power supply stability.

[0059] In some optional embodiments, such as Figure 4 As shown, the full-bridge circuit 11 includes: a first capacitor C1, a second power switch device Q2, a third power switch device Q3, a fourth power switch device Q4, and a fifth power switch device Q5.

[0060] like Figure 4 As shown, the first end of the second power switch device Q2 is connected to the first end of the fourth power switch device Q4 and the first end of the first capacitor C1, and the first end of the second power switch device Q2 is also connected to the positive DC voltage through the hot plug and soft start control module 2 (i.e., Q1), and the second end of the second power switch device Q2 is connected to the first end of the third power switch device Q3 and the first end of the primary side of the transformer 12 (i.e., Lr).

[0061] like Figure 4 As shown, the second end of the third power switch device Q3 is connected to the second end of the first capacitor C1 and the second end of the fifth power switch device Q5 and then grounded, and the second end of the third power switch device Q3 is input with a negative DC voltage.

[0062] like Figure 4 As shown, the second end of the fourth power switch device Q4 is connected to the first end of the fifth power switch device Q5 and the second end (ie, Cr) of the primary side of the transformer 12 .

[0063] Optionally, Figure 4 The second power switch device Q2 , the third power switch device Q3 , the fourth power switch device Q4 , and the fifth power switch device Q5 are MOS tubes as examples, but this is only an example and is not intended to be limiting.

[0064] In some optional embodiments, such as Figure 4 As shown, the transformer 12 includes: inductors Lr, Lp and capacitors Cr, Figure 4 Under the transformer 12 structure shown, the voltage conversion circuit 1 is an LLC resonant conversion circuit. The LLC resonant conversion circuit has the advantages of high efficiency, wide range of input voltage, low noise interference, high stability, etc.

[0065] In some optional embodiments, such as Figure 4 As shown, the rectifier circuit 13 includes: a sixth power switch device Q6, a seventh power switch device Q7, an eighth power switch device Q8 and a ninth power switch device Q9.

[0066] like Figure 4As shown, the first end of the sixth power switch device Q6 is connected to the first end of the eighth power switch device Q8, the first end of the filter circuit 14 (i.e., C2~C4), and the first end of the sampling resistor R1, and the second end of the sixth power switch device Q6 is connected to the first end of the secondary side of the transformer 12 (i.e., Lp) and the first end of the seventh power switch device Q7.

[0067] like Figure 4 As shown, the second end of the seventh power switch device Q7 is connected to the second end of the filter circuit 14 and the second end of the ninth power switch device Q9 and then grounded.

[0068] like Figure 4 As shown, the second end of the eighth power switch device Q8 is connected to the first end of the ninth power switch device Q9 and the second end of the secondary side of the transformer 12 .

[0069] Optionally, Figure 4 The sixth power switch device Q6 , the seventh power switch device Q7 , the eighth power switch device Q8 and the ninth power switch device Q9 are MOS tubes as examples, but this is only an example and is not intended to be limiting.

[0070] In some optional implementations, the filter circuit 14 includes: a plurality of filter capacitors connected in parallel.

[0071] Specifically, the structure of the filter circuit 14 is as follows: Figure 4 As shown, Figure 4 In the figure, the filter circuit 14 is composed of three capacitors C2 to C4 connected in parallel, but other filter circuit structures, such as LC, RLC, etc., can also be used, which is not limited here.

[0072] In some optional embodiments, Figure 4 In the embodiment, the anti-reverse circuit 15 includes: a tenth power switch device Q10 and a second diode D2, wherein the first end of the tenth power switch device Q10 is connected to the second end of the sampling resistor R1, and the second end of the tenth power switch device Q10 is connected to the gold finger; the second diode D2 is connected to the tenth power switch device Q10 in reverse parallel.

[0073] Specifically, the tenth power switch device Q10 is a MOS tube. Within the working range of the MOS tube, the current is conducted unidirectionally, thereby preventing the current from being reversed.

[0074] In some optional embodiments, such as Figure 5 As shown, the power supply circuit further includes: a fuse FUSE, wherein the first input end of the voltage conversion circuit 1 is connected to the positive DC voltage through the fuse, the hot plug and soft start control module 2 in sequence.

[0075] Specifically, when the voltage conversion circuit 1 works normally, when the input voltage is too high, the fuse FUSE is disconnected to isolate the faulty power supply.

[0076] In some optional implementations, the voltage conversion circuit 1 includes: a feedback pin, which is the shortest pin of the voltage conversion circuit 1 and is grounded, and the power supply circuit further includes: an in-place detection circuit.

[0077] Specifically, when the voltage conversion circuit 1 is inserted, that is, the feedback pin is connected to the access point of the in-place detection circuit, the in-place detection circuit outputs an insertion signal, and the insertion signal is used to control the hot plug and soft start control module 2 to close.

[0078] Specifically, when the voltage conversion circuit 1 is unplugged, that is, the feedback pin is disconnected from the access point of the in-place detection circuit, the in-place detection circuit outputs an unplug signal, which is used to control the hot plug and soft start control module 2 to disconnect.

[0079] Optionally, the specific circuit structure of the in-place detection circuit is as follows: Figure 6 As shown in the figure, the power supply circuit is connected to the connector on the motherboard through the gold finger to complete the plug-in and unplug operation. There is a PRESENT signal pin on the power supply circuit, which is the shortest pin and is connected to the primary signal ground through a 0 ohm resistor. There is a 10k pull-up resistor connected to 3.3V on the motherboard, and the PRESENT pin level is monitored by the DSP to determine whether the module power supply has been plugged in.

[0080] When the power supply circuit is inserted into the mainboard, because PRESENT is the shortest pin, the PRESENT level will be pulled to GND only when the module is plugged in. When the DSP detects that PRESENT is at a low level, it can be considered that the module is plugged in, and the hot-swap and slow-start control module 2 is turned on to safely connect the 400Vdc bus to the module. Similarly, when the power supply circuit is unplugged, because PRESENT is the shortest pin, it will be disconnected from the connector before other pins, and PRESENT will change from a low level to a high level. As long as the DSP detects the rising edge level of PRESENT, it will immediately turn off the hot-swap and slow-start control module 2, disconnect the 400Vdc bus from the power supply circuit, and realize the safe unplugging of the power supply circuit without power.

[0081] Optionally, after the power supply circuit is plugged in, shaking may occur, causing the feedback pin to output a pull-out signal. The DSP of the mainboard can detect whether the pull-out signal is continuously received for a period of time. If the pull-out signal is continuously received, the hot plug and soft start control module 2 is turned off. If the pull-out signal is always intermittent, the DSP can send a fault signal.

[0082] In this embodiment, a power supply system is provided. Figure 7As shown, it includes: a power supply circuit of multiple above embodiments and any optional implementation manner thereof.

[0083] In an optional embodiment, if Figure 8 As shown, the input of the high-voltage DC power supply architecture is a high-voltage DC of 400Vdc, followed by a main relay and an over-temperature protection circuit to achieve normal power-on and over-temperature protection control of the power supply circuit. Behind the main relay and the over-temperature protection circuit is a Bulk capacitor, namely C1. C1 is used to store energy and power the system in the event of a power outage, while completing the backup power supply switch. Behind the Bulk capacitor is an N+1 module power supply (i.e., power supply circuit). Each module power supply is a first-level DC-DC conversion with an output of 12Vdc. The N+1 modules are connected together inside the power supply system. The power supply system is externally compatible with standard CRPS sizes and gold finger connectors, and is connected to the gold finger connector on the motherboard through gold fingers to power the server motherboard.

[0084] The specific circuit structure of the power supply system is as follows: Fig. 9 As shown, the main relay and over-temperature protection circuit include a relay, a PTC resistor, an NTC resistor and an IGBT.

[0085] like Fig. 9 As shown, a MOSFET or relay is added between the 400Vdc busbar and the N+1 module power supply to control the on and off of each module. The MOSFET is located on the main board, and each module is vertically plugged into the main board through a connector. When the MOSFET is turned off, the 400Vdc busbar and the module power supply are disconnected, and the module power supply can be safely unplugged or plugged in. When the module power supply is plugged in, turn on the MOSFET to connect the main 400Vdc busbar to the module power supply.

[0086] based on Fig. 9 The process of implementing online hot swapping in this embodiment is as follows:

[0087] (1) The current high-voltage DC power supply architecture cannot realize hot plugging of N+1 module power supplies while powered on, and is not easy to maintain. Because the 400Vdc DC bus is directly connected to the module power supply, direct plugging and unplugging when the main circuit is powered on is very dangerous.

[0088] (2) The improved high-voltage DC power supply architecture adds a MOSFET or relay between the 400Vdc bus and the N+1 module power supply to control the on and off of the main circuit. The MOSFET is located on the main board. The module power supply is connected to the main board connector through a gold finger to complete the plug-in and unplug operation.

[0089] (3) When the PSU is working normally, when the module power supply is unplugged from the motherboard connector, first disconnect the main MOSFET and disconnect the module's 400Vdc busbar, so that the module can be safely unplugged without power; when the module power supply is plugged into the motherboard connector, in order to insert it without power, first ensure that the module power supply is plugged in place, then turn on the MOSFET and connect to the 400Vdc busbar.

[0090] (4) There is a PRESENT signal pin on the module power supply, which is the shortest pin and is connected to the primary signal ground through a 0 ohm resistor. There is a 10k pull-up resistor connected to 3.3V on the mainboard. The DSP monitors the PRESENT pin level to determine whether the module power supply is plugged in.

[0091] (5) When the module power supply is inserted into the mainboard, because PRESENT is the shortest pin, the PRESENT level will be pulled to GND only when the module is plugged in. When the DSP detects that PRESENT is low, it can be considered that the module is plugged in, turn on the hot-swap & slow-start MOSFET, and safely connect the 400Vdc bus to the module.

[0092] (6) Similarly, when the module power supply is unplugged from the motherboard connector, because PRESENT is the shortest pin, it will be disconnected from the connector before other pins. PRESENT changes from a low level to a high level. As long as the DSP detects the rising edge level, it immediately turns off the main MOSFET and disconnects the 400Vdc bus from the module, thereby achieving safe unplugging of the module.

[0093] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A power supply circuit, characterized in that: include: Voltage conversion circuit, hot plug and slow start control module, among which, The first input end of the voltage conversion circuit is connected to the positive DC voltage through the hot plug and slow start control module, the second input end of the voltage conversion circuit is connected to the negative DC voltage, and the first output end and the second output end of the voltage conversion circuit are connected to the gold finger connector of the mainboard through the gold finger; the voltage conversion circuit is used to convert the DC power into the power supply voltage of the gold finger; The hot-swap and slow-start control module is located on the main board; When the voltage conversion circuit is unplugged or plugged in, disconnecting the hot plug and soft start control module; After the voltage conversion circuit is inserted, the hot plug and soft start control module is closed.

2. The power supply circuit according to claim 1, characterized in that: The hot-swap and slow-start control module includes: a first power switch device and a first diode, wherein: The first end of the first power switch device is connected to the first input end of the voltage conversion circuit, and the second end of the first power switch device is connected to the positive DC voltage; The first diode is connected in anti-parallel to the first power switch device.

3. The power supply circuit according to claim 1, characterized in that: The voltage conversion circuit includes: a full-bridge circuit, a transformer, a rectifier circuit, a filter circuit, a sampling resistor and an anti-reverse circuit, wherein: The first DC end of the full-bridge circuit is connected to a positive DC voltage through the hot-swap and soft-start control module, the second DC end of the full-bridge circuit is connected to a negative DC voltage, and the first AC end and the second AC end of the full-bridge circuit are connected to the primary side of the transformer; The first AC end and the second AC end of the rectifier circuit are connected to the secondary side of the transformer, the first DC end of the rectifier circuit is connected to the first end of the filter circuit and the first end of the sampling resistor, and the second DC end of the rectifier circuit is connected to the second end of the filter circuit and then grounded; The first end of the anti-reverse circuit is connected to the second end of the sampling resistor, and the second end of the anti-reverse circuit is connected to the gold finger; The second end of the filter circuit is connected to the gold finger.

4. The power supply circuit according to claim 3, characterized in that: The full-bridge circuit includes: a first capacitor, a second power switch device, a third power switch device, a fourth power switch device, and a fifth power switch device, wherein: The first end of the second power switch device is connected to the first end of the fourth power switch device and the first end of the first capacitor, the first end of the second power switch device is also connected to the positive DC voltage through the hot plug and slow start control module, and the second end of the second power switch device is connected to the first end of the third power switch device and the first end of the primary side of the transformer; The second end of the third power switch device is connected to the second end of the first capacitor and the second end of the fifth power switch device and then grounded, and the negative DC voltage is input to the second end of the third power switch device; The second end of the fourth power switch device is connected to the first end of the fifth power switch device and the second end of the primary side of the transformer.

5. The power supply circuit according to claim 3, characterized in that: The rectifier circuit includes: a sixth power switch device, a seventh power switch device, an eighth power switch device and a ninth power switch device, wherein: The first end of the sixth power switch device is connected to the first end of the eighth power switch device, the first end of the filter circuit, and the first end of the sampling resistor, and the second end of the sixth power switch device is connected to the first end of the secondary side of the transformer and the first end of the seventh power switch device; The second end of the seventh power switch device is connected to the second end of the filter circuit and the second end of the ninth power switch device and then grounded; The second end of the eighth power switch device is connected to the first end of the ninth power switch device and the second end of the secondary side of the transformer.

6. The power supply circuit according to claim 3, characterized in that: The filter circuit includes: a plurality of filter capacitors connected in parallel.

7. The power supply circuit according to claim 3, characterized in that: The anti-reverse circuit includes: a tenth power switch device and a second diode, wherein: The first end of the tenth power switch device is connected to the second end of the sampling resistor, and the second end of the tenth power switch device is connected to the gold finger; The second diode is connected in anti-parallel to the tenth power switch device.

8. The power supply circuit according to claim 1, characterized in that: Also includes: Fuses, where The first input end of the voltage conversion circuit is connected to the positive DC voltage through the fuse, hot plug and soft start control module in sequence.

9. The power supply circuit according to claim 1, characterized in that: The voltage conversion circuit includes: a feedback pin, the feedback pin is the shortest pin of the voltage conversion circuit, and the feedback pin is grounded. The power supply circuit also includes: a presence detection circuit, wherein: When the voltage conversion circuit is inserted, that is, when the feedback pin is connected to the access point of the in-place detection circuit, the in-place detection circuit outputs an insertion signal, and the insertion signal is used to control the hot-swap and soft-start control module to close; When the voltage conversion circuit is unplugged, that is, when the feedback pin is disconnected from the access point of the presence detection circuit, the presence detection circuit outputs a pull-out signal, and the pull-out signal is used to control the hot-plug and soft-start control module to disconnect.

10. A power supply system, characterized in that: include: A power supply circuit as described in any one of claims 1 to 9.

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