Load power supply device and centralized power supply system

Abstract

The invention discloses a load power supply device and a centralized power supply system, the power supply device comprises a power supply, a transformer and a primary side soft switch module, and the primary side soft switch module comprises a soft switch unit and a resonance unit; the power supply is connected with the soft switch unit, the soft switch unit is connected with the resonance unit, the resonance unit is connected with a primary winding of the transformer, and a secondary winding of the transformer is connected with the load; the resonance unit is used for reducing the switching voltage of a preset switching tube in the soft switching unit under the condition of a preset quasi-resonance state, and conducting the soft switching unit with zero voltage. The technical problem of low voltage conversion efficiency is solved.

Description

Technical Field

[0001] The present application relates to the field of power supply technology, and in particular to a power supply device for a load and a centralized power supply system. Background Art

[0002] The input voltage supported by the server is almost all 12V, so the 12V centralized power supply can directly power the server motherboard. The general power supply is 48V. When powering the server, the 48V voltage needs to be converted into 12V before the server can be powered.

[0003] However, the current 48V to 12V circuit usually uses hard switches for conversion, but the efficiency of voltage conversion using hard switches is low. For example, during the conduction process of hard switches (such as MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor), IGBT (Insulated Gate Bipolar Transistor), etc.), there is a period when the voltage and current are not zero at the same time. During this period, the hard switch will bear the voltage and the current flowing through at the same time, resulting in losses during the conduction process, thereby reducing the efficiency of voltage conversion.

[0004] The above contents are only used to assist in understanding the technical solution of the present application and do not constitute an admission that the above contents are prior art. Summary of the invention

[0005] The main purpose of the present application is to provide a load power supply device and a centralized power supply system, aiming to solve the technical problem of low voltage conversion efficiency.

[0006] To achieve the above object, the present application provides a power supply device, the power supply device comprising a power supply, a transformer and a primary soft switch module, the primary soft switch module comprising a soft switch unit and a resonance unit;

[0007] The power supply is connected to the soft switch unit, the soft switch unit is connected to the resonance unit, the resonance unit is connected to the primary winding of the transformer, and the secondary winding of the transformer is connected to the load;

[0008] The resonance unit is used to reduce the switching voltage of a preset switch tube in the soft switching unit in a preset quasi-resonance state, and turn on the soft switching unit with zero voltage.

[0009] In one embodiment, the soft switch unit includes a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a first body diode, a second body diode, a third body diode, a fourth body diode, a first parasitic capacitor, a second parasitic capacitor, a third parasitic capacitor, and a fourth parasitic capacitor;

[0010] The first body diode and the first parasitic capacitor are connected in parallel at the first end and the second end of the first switch tube, the second body diode and the second parasitic capacitor are connected in parallel at the first end and the second end of the second switch tube, the third body diode and the third parasitic capacitor are connected in parallel at the first end and the second end of the third switch tube, and the fourth body diode and the fourth parasitic capacitor are connected in parallel at the first end and the second end of the fourth switch tube;

[0011] The first end of the first switch tube and the second end of the second switch tube are connected to the power supply, the first end of the first switch tube is connected to the first end of the third switch tube, and the second end of the second switch tube is connected to the second end of the fourth switch tube.

[0012] In one embodiment, the resonance unit includes a resonance capacitor, a resonance inductor and an excitation inductor;

[0013] The first end of the resonant capacitor is connected to the first end of the excitation inductor, the second end of the resonant capacitor is connected to the first end of the fourth switch tube, the first end of the excitation inductor is connected to the first end of the primary winding, the second end of the excitation inductor is connected to the second end of the primary winding and the first end of the resonant inductor, and the second end of the resonant inductor is connected to the second end of the first switch tube;

[0014] When the excitation current of the excitation inductor is equal to the resonant current of the resonant inductor, determining that the resonant unit is in a preset quasi-resonant state;

[0015] When the direction of the resonant current of the resonance unit in the preset quasi-resonant state is a preset positive direction, the preset switch tubes in the soft switching unit are the second switch tube and the third switch tube; when the direction of the resonant current of the resonance unit in the preset quasi-resonant state is a preset negative direction, the preset switch tubes in the soft switching unit are the first switch tube and the fourth switch tube.

[0016] In one embodiment, the power supply device further includes: a secondary side rectifier module disposed between the secondary side winding and the load, the secondary side rectifier module including: a first secondary side switch unit, a second secondary side switch unit and a secondary side capacitor;

[0017] The first end of the first secondary switch unit is connected to the first end of the secondary winding, the first end of the second secondary switch unit is connected to the second end of the secondary winding, the first end of the secondary capacitor is connected to the third end of the secondary winding, and the second end of the first secondary switch unit, the second end of the second secondary switch and the second end of the secondary capacitor are grounded.

[0018] In one embodiment, the power supply device further comprises a control module, wherein the control module comprises a control unit, a microcontroller power supply and a drive circuit;

[0019] The microcontroller power supply is connected to the control unit and the drive circuit, the control unit is connected to the drive circuit, and the drive circuit is connected to the third end of the first secondary switch unit and the third end of the second secondary switch unit;

[0020] The control unit is used to control the on and / or off of the first secondary switch unit through the drive circuit, and is also used to control the on and / or off of the second secondary switch unit through the drive circuit.

[0021] In one embodiment, the control unit is further used to collect the output voltage and output current output by the secondary side rectifier module, and the control unit is further used to control the on-duty cycle of the soft switch unit based on the output voltage and the output current;

[0022] The control unit is also used to collect the first temperature of the primary soft switch module and the second temperature of the secondary rectifier module, and is also used to control the soft switch unit to disconnect when the first temperature is greater than a preset temperature threshold, and to control the first secondary switch unit and the second secondary switch unit in the secondary rectifier module to disconnect when the second temperature is greater than a preset temperature threshold.

[0023] In one embodiment, the power supply device further includes: a secondary side rectifier module disposed between the secondary side winding and the load, the secondary side rectifier module including: a first secondary side switch unit, a second secondary side switch unit and a secondary side capacitor;

[0024] The first end of the first secondary switch unit is connected to the first end of the secondary winding, the first end of the second secondary switch unit is connected to the second end of the secondary winding, and the first end of the secondary capacitor is connected to the third end of the secondary winding;

[0025] The second end of the first secondary switch unit, the second end of the second secondary switch unit and the second end of the secondary capacitor are grounded, or the second end of the first secondary switch unit and the second end of the second secondary switch unit are connected to the second end of the secondary capacitor.

[0026] In one embodiment, when the second end of the first secondary switch unit, the second end of the second secondary switch, and the second end of the secondary capacitor are grounded, the power supply device further includes a control module, and the control module includes a control unit, a microcontroller power supply, and a drive circuit;

[0027] The microcontroller power supply is connected to the control unit and the drive circuit, the control unit is connected to the drive circuit, and the drive circuit is connected to the third end of the first secondary switch unit and the third end of the second secondary switch unit;

[0028] The control unit is used to control the on and / or off of the first secondary switch unit through the drive circuit, and is also used to control the on and / or off of the second secondary switch unit through the drive circuit.

[0029] In one embodiment, the control unit is further used to collect the output voltage and output current output by the secondary side rectifier module, and the control unit is further used to control the on-duty cycle of the soft switch unit based on the output voltage and the output current;

[0030] The control unit is also used to collect the first temperature of the primary soft switch module and the second temperature of the secondary rectifier module, and is also used to control the soft switch unit to disconnect when the first temperature is greater than a preset temperature threshold, and to control the first secondary switch unit and the second secondary switch unit in the secondary rectifier module to disconnect when the second temperature is greater than a preset temperature threshold.

[0031] In one embodiment, when the second end of the first secondary switch unit and the second end of the second secondary switch are connected to the second end of the secondary capacitor, the power supply device further includes a control module, and the control module includes a control unit, a microcontroller power supply, an isolation power supply, and an isolation chip;

[0032] The microcontroller power supply is connected to the control unit, the control unit is connected to the isolation chip, the isolation chip is connected to the third end of the first secondary switch unit and the third end of the second secondary switch unit, and the isolation power supply is connected to the isolation chip;

[0033] The control unit is used to control the conduction and / or disconnection of the first secondary switch unit through the isolation chip, and is also used to control the conduction and / or disconnection of the second secondary switch unit through the isolation chip.

[0034] In one embodiment, the first secondary side switch unit is a switch tube unit or a plurality of switch tube units connected in parallel or a gallium nitride device;

[0035] The second secondary side switch unit is a switch tube unit or a plurality of switch tube units connected in parallel or a gallium nitride device.

[0036] In one embodiment, the power supply device further includes: a power supply connector arranged at the input end of the primary soft switch module, and a gold finger arranged at the output end of the secondary rectifier module connected to the secondary winding of the transformer.

[0037] In one embodiment, the transformer, primary side soft switch module, secondary side rectifier module, control module, gold finger and power supply connector are integrated into a pluggable voltage conversion component, the pluggable voltage conversion component is connected to the power supply through the power supply connector, and the pluggable voltage conversion component is connected to the load through the gold finger.

[0038] In addition, to achieve the above-mentioned purpose, the present application also provides a centralized power supply system, which includes a power supply device for the load as described above.

[0039] One or more technical solutions proposed in the present application have at least the following technical effects: the power supply device of the present application includes a power supply, a transformer and a primary soft switch module connected to the primary winding of the transformer, the primary soft switch module includes a soft switch unit and a resonance unit, wherein the power supply can be connected to the soft switch unit, the soft switch unit can be connected to the resonance unit, the resonance unit can be connected to the primary winding, and the secondary winding of the transformer can be connected to the load, so that the power supply can supply power to the load through the soft switch unit, the resonance unit and the transformer, and because the resonance unit is in a preset quasi-resonant state, the switching voltage of the preset switch tube in the soft switch unit can be reduced, so that the soft switch unit can be turned on with zero voltage, so that there will be no loss in the soft switch unit during the conduction process, and thus when the power supply in the power supply device supplies power to the load through the soft switch unit, the resonance unit and the transformer, the switch loss is reduced, thereby improving the voltage conversion efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the description, are used to explain the principles of the present application.

[0041] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0042] Figure 1 This is a schematic diagram of a module in an embodiment of the power supply device of the present application;

[0043] Figure 2 This is a circuit connection diagram of the soft switch unit in the power supply device of the present application;

[0044] Figure 3 A schematic diagram of the circuit connection of the soft switch unit and the resonance unit in the power supply device of the present application;

[0045] Figure 4 This is a schematic diagram of a module of another embodiment of the power supply device of the present application;

[0046] Figure 5 This is a schematic diagram of an example module of a secondary rectifier module in the power supply device of the present application;

[0047] Figure 6 This is a schematic diagram of an exemplary circuit connection of a secondary rectifier module in the power supply device of the present application;

[0048] Figure 7 This is a circuit connection diagram of another embodiment of the power supply device of the present application;

[0049] Figure 8 A module schematic diagram of another example of a secondary rectifier module in the power supply device of the present application;

[0050] Fig. 9 This is a circuit connection diagram of another example of a secondary rectifier module in the power supply device of the present application;

[0051] Fig.10 This is a circuit connection diagram of an embodiment of the power supply device of the present application;

[0052] Fig.11 This is a physical diagram of a waveform change in an example of a power supply device of the present application;

[0053] Fig.12 This is a schematic diagram of the structure of a pluggable voltage conversion component in the power supply device of the present application;

[0054] Fig.13 This is a schematic diagram of the structure of the pluggable voltage conversion component and the server in the power supply device of this application;

[0055] Fig.14 This is a schematic diagram of a parallel operation of an example of a power supply device of the present application;

[0056] Fig.15 This is a schematic diagram of another example of parallel operation involved in the present application.

[0057] Description of Figure Numbers:

[0058] 100, power supply; 200, primary soft switch module; 300, transformer; 400, load; 210, soft switch unit; 220, resonant unit; 310, primary winding; 320, secondary winding; S1~S4: first switch tube~fourth switch tube; D1~D6, first body diode~sixth body diode; C1~C6, first parasitic capacitor~sixth parasitic capacitor; Lr, resonant inductor; Cr, resonant capacitor; Lm, excitation inductor; T, magnetic core; 500, secondary rectifier module; 510, first secondary switch unit ; 520, second secondary side switch unit; Cc, secondary side capacitor; SQ1~SQ2, first secondary side switch tube~second secondary side switch tube; 600, control module; 610, control unit; 620, microcontroller power supply; 630, drive circuit; 631, first drive circuit; 632, second drive circuit; X1, first isolation chip; X2, second isolation chip; X3, isolated power supply; 700, power supply connector; 800, gold finger; M1, carrier; 1000, pluggable voltage conversion component; 2000, server machine.

[0059] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0060] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0061] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0062] Currently, 48V to 12V circuits usually use hard switches for conversion. For example, non-isolated DC / DC (DC / DC Converter) or flyback voltage conversion circuits inevitably use hard switches for voltage conversion, but the efficiency of voltage conversion using hard switches is low. For example, during the conduction process of a hard switch (such as MOSFET, IGBT, etc.), there is a period when the voltage and current are not zero at the same time. During this period, the hard switch will bear the voltage and the current flowing through at the same time, resulting in losses during the conduction process, thereby reducing the efficiency of voltage conversion.

[0063] The voltage conversion rate of a non-isolated DC / DC circuit can only reach about 92%, resulting in high power loss and greatly increasing the operating cost of the server. In addition, due to the non-isolated characteristics of the non-isolated DC / DC circuit, the interference generated by the front-stage power supply is easily transmitted to the back-stage, affecting the normal operation of the server components. When the front-stage power supply fails, it is easy to cause damage to the back-stage server components. To this end, the present application provides a power supply device, which includes a transformer, so that the power supply and the server can be isolated by the transformer to avoid damage to the server when the power supply fails. The power supply device also includes a soft switch unit and a resonance unit. The soft switch unit can be turned on at zero voltage when the resonance unit is in a preset quasi-resonant state, so that when the power supply is used to supply power to the server through the primary side soft switch module and the transformer, the switch loss can be reduced and the voltage conversion efficiency can be improved.

[0064] Based on this, the present application embodiment provides a power supply device, referring to Figure 1 The power supply device includes a power supply 100, a transformer 300 and a primary soft switch module 200, and the primary soft switch module 200 includes a soft switch unit 210 and a resonance unit 220;

[0065] The power supply 100 is connected to the soft switch unit 210, the soft switch unit 210 is connected to the resonance unit 220, the resonance unit 220 is connected to the primary winding 310 of the transformer 300, and the secondary winding 320 of the transformer 300 is connected to the load;

[0066] The resonance unit 220 is used to reduce the switching voltage of the preset switch tube in the soft switch unit 210 in the case of a preset quasi-resonance state, and turn on the soft switch unit 210 with zero voltage.

[0067] It should be noted that the power supply 100 is used to provide electric energy, and the power supply 100 can be a 48V power supply, etc., which is not specifically limited in this embodiment. When the resonance unit 220 is in a preset quasi-resonance state, the soft switch unit 210 can be triggered to conduct at zero voltage. The preset quasi-resonance state means that the working frequency of the resonance unit 220 works near the resonance frequency, and the resonance frequency is equal to the switching frequency of the soft switch unit 210. For example, when the working frequency is equal to the resonance frequency, or the absolute value of the difference between the resonance frequency and the working frequency is less than or equal to the preset frequency difference, it is determined that the resonance unit 220 is in a preset quasi-resonance state, and the soft switch unit 210 can be turned on at zero voltage. Thereby, the voltage loss caused by the switch can be reduced and the efficiency of voltage conversion can be improved. Among them, the soft switch unit 210 can include multiple switch tubes, and the soft switch unit 210 is turned on at zero voltage, which can be part of the switch tubes in the soft switch unit 210. The switching frequency can be the frequency of switching the switch tubes in the soft switch unit 210, and the switching frequency of the soft switch unit 210 can be set based on actual conditions. The switch voltage is the voltage across the switch of the preset switch tube. The load can be a server machine, etc.

[0068] The transformer 300 includes a primary winding 310 and a secondary winding 320 wound on the magnetic core of the transformer 300 . The primary winding 310 can provide energy to the secondary winding 320 through the magnetic core of the transformer 300 , and can provide electrical energy to the load through the secondary winding 320 . Figure 1 The T in the middle is the magnetic core.

[0069] The power supply device of the embodiment of the present application includes a power supply 100, a transformer 300, and a primary soft switch module 200 connected to the primary winding 310 of the transformer 300, wherein the primary soft switch module 200 includes a soft switch unit 210 and a resonance unit 220, wherein the power supply 100 can be connected to the soft switch unit 210, the soft switch unit 210 can be connected to the resonance unit 220, the resonance unit 220 can be connected to the primary winding 310, and the secondary winding 320 of the transformer 300 can be connected to the load, so that the power supply 100 can be connected to the primary winding 310 through the soft switch unit 210. The switch unit 210, the resonance unit 220 and the transformer 300 supply power to the load. Since the resonance unit 220 is in a preset quasi-resonant state, the switching voltage of the preset switch tube in the soft switch unit 210 can be reduced, so that the soft switch unit 210 can be turned on with zero voltage, so that there will be no loss in the soft switch unit 210 during the conduction process, and then when the power supply 100 in the power supply device supplies power to the load through the soft switch unit 210, the resonance unit 220 and the transformer 300, the switch loss is reduced, thereby improving the voltage conversion efficiency.

[0070] For further information, please refer to Figure 2 , Figure 2The circuit connection diagram of the soft switch unit 210 is shown. In a feasible embodiment, the soft switch unit 210 includes a first switch tube S1, a second switch tube S2, a third switch tube S3, a fourth switch tube S4, a first body diode D1, a second body diode D2, a third body diode D3, a fourth body diode D4, a first parasitic capacitor C1, a second parasitic capacitor C2, a third parasitic capacitor C3, and a fourth parasitic capacitor C4;

[0071] A first body diode D1 and a first parasitic capacitor C1 are connected in parallel at a first end and a second end of the first switch tube S1, a second body diode D2 and a second parasitic capacitor C2 are connected in parallel at a first end and a second end of the second switch tube S2, a third body diode D3 and a third parasitic capacitor C3 are connected in parallel at a first end and a second end of the third switch tube S3, and a fourth body diode D4 and a fourth parasitic capacitor C4 are connected in parallel at a first end and a second end of the fourth switch tube S3;

[0072] The first end of the first switch tube S1 and the second end of the second switch tube S2 are connected to the power supply 100 , the first end of the first switch tube S1 is connected to the first end of the third switch tube S3 , and the second end of the second switch tube S2 is connected to the second end of the fourth switch tube S4 .

[0073] It should be noted that the multiple switch tubes included in the soft switch unit 210 are respectively a first switch tube S1, a second switch tube S2, a third switch tube S3 and a fourth switch tube S4. The multiple switch tubes of the soft switch unit 210 can all be MOS tubes. The first end and the second end of each switch tube are connected in parallel with a body diode and a capacitor. The first end of each switch tube is the source of the switch tube, the second end of each switch tube is the drain of the switch tube, and the third end of each switch tube is the gate of the switch tube.

[0074] In this embodiment, by connecting a body diode and a parasitic capacitor in parallel at the first and second ends of each switch tube in the soft switching unit 210, the loss of the switch tube during switching can be reduced through the body diode and the parasitic capacitor, so that when the resonance unit 220 is in a preset quasi-resonant state, the voltage across the switch tube can be quickly reduced to 0, so that the switch tube can be turned on with zero voltage.

[0075] Further, see Figure 3 , Figure 3 , a circuit connection diagram of the soft switch unit 210 and the resonance unit 220 is shown. In a feasible embodiment, the resonance unit 220 includes a resonance capacitor Cr, a resonance inductor Lr and an excitation inductor Lm;

[0076] A first end of the resonant capacitor Cr is connected to a first end of the excitation inductor Lm, a second end of the resonant capacitor Cr is connected to a first end of the fourth switch tube S4, a first end of the excitation inductor Lm is connected to a first end of the primary winding 310, a second end of the excitation inductor Lm is connected to a second end of the primary winding 310 and a first end of the resonant inductor Lr, and a second end of the resonant inductor Lr is connected to a second end of the first switch tube S1;

[0077] When the excitation current of the excitation inductor Lm is equal to the resonant current of the resonant inductor Lr, it is determined that the resonant unit 220 is in a preset quasi-resonant state;

[0078] When the direction of the resonant current of the resonance unit 220 in the preset quasi-resonant state is a preset positive direction, the preset switch tubes in the soft switch unit 210 are the second switch tube S2 and the third switch tube S3. When the direction of the resonant current of the resonance unit 220 in the preset quasi-resonant state is a preset negative direction, the preset switch tubes in the soft switch unit 210 are the first switch tube S1 and the fourth switch tube S4.

[0079] It should be noted that the specific values ​​of the resonant capacitor Cr and the resonant inductor Lr can be determined based on the switching frequency of the soft switch unit 210. For example, when the switching frequency of the soft switch unit 210 is set to 50 kHz, the resonant frequency can also be set to 50 kHz. Based on the relationship between the resonant frequency and the resonant capacitor Cr and the resonant inductor Lr, the values ​​of the resonant capacitor Cr and the resonant inductor Lr are determined. For example, the relationship between the resonant frequency and the resonant capacitor Cr and the resonant inductor Lr can be:

[0080]

[0081] Among them, f r is the resonant frequency, L r is the resonant inductor Lr, is the resonant capacitor Cr, when the resonant frequency is 50kHZ, the resonant inductor LrL r The value of can be 10uH, the resonant capacitor Cr value C r The resonant inductor Lr and the resonant capacitor Cr may also be other values ​​that satisfy the relationship. In this embodiment, the resonant frequency of the resonant unit 220 is set based on the switching frequency of the soft switch unit 210, so as to provide a zero voltage turn-on condition for the soft switch unit 210, that is, when the resonant unit 220 is in a preset quasi-resonant state, the voltage of the preset switch tube in the soft switch unit 210 can be reduced, so as to facilitate zero voltage turn-on of the soft switch unit 210.

[0082] The excitation inductance Lm is used to store energy. When current flows through the excitation inductance Lm, a magnetic field can be generated at the excitation inductance Lm, and the magnetic field can store energy. The excitation inductance Lm can be connected in parallel at both ends of the primary winding 310, that is, the first end of the excitation inductance Lm is connected to the first end of the primary winding 310, and the second end of the excitation inductance Lm is connected to the second end of the primary winding 310.

[0083] The resonant current is the current generated by the resonant inductor Lr, and the excitation current is the current generated by the excitation inductor Lm. When the excitation current and the resonant current are equal, the operating frequency of the resonant unit 220 will be close to the resonant frequency, and the resonant unit 220 can be considered to be in a preset quasi-resonant state.

[0084] The preset positive direction refers to the direction in which the resonant current flows from the resonant inductor Lr to the excitation inductor Lm, and the preset negative direction refers to the direction in which the resonant current flows from the excitation inductor Lm to the resonant inductor Lr. Figure 3 It can be seen that when the direction of the resonant current is the preset forward direction, under the action of the preset forward resonant current, the second parasitic capacitor C2 connected in parallel with the second switch tube S2 and the third parasitic capacitor C3 connected in parallel with the third switch tube S3 are discharged. After the second parasitic capacitor C2 and the third parasitic capacitor C3 are discharged, the second body diode D2 connected in parallel with the second switch tube S2 and the third body diode D3 connected in parallel with the third switch tube continue to flow, so that the second switch tube S2 and the third switch tube S3 are turned on at zero voltage, so that the soft switch unit 210 is turned on at zero voltage.

[0085] When the direction of the resonant current is a preset negative direction, under the action of the preset negative resonant current, the first parasitic capacitor C1 connected in parallel with the first switch tube S1 and the fourth parasitic capacitor C4 connected in parallel with the fourth switch tube S4 are discharged. After the first parasitic capacitor C1 and the fourth parasitic capacitor C4 are discharged, the first body-diode connected in parallel with the first switch tube S1 and the fourth body-diode connected in parallel with the fourth switch tube continue to flow, thereby making the first switch tube S1 and the fourth switch tube S4 turned on at zero voltage, and making the soft switch unit 210 turned on at zero voltage.

[0086] In this embodiment, a resonance unit 220 is set in the power supply device, thereby providing a zero-voltage turn-on condition for the soft switch unit 210, so that the soft switch unit 210 can turn on the preset switch tube in the soft switch unit 210 based on the zero-voltage of the resonant current, thereby reducing the loss in the voltage conversion process and improving the efficiency of the voltage conversion.

[0087] Further, in a feasible embodiment, please refer to Figure 4 and Figure 5 , Figure 4 is a schematic structural diagram of a power supply device including a secondary rectifier module 500, Figure 5is a structural diagram of a secondary rectifier module 500, the power supply device further includes: a secondary rectifier module 500 arranged between the secondary winding 320 and the load, the secondary rectifier module 500 includes: a first secondary switch unit 510, a second secondary switch unit 520 and a secondary capacitor Cc;

[0088] A first end of the first secondary switch unit 510 is connected to a first end of the secondary winding 320, a first end of the second secondary switch unit 520 is connected to a second end of the secondary winding 320, and a first end of the secondary capacitor Cc is connected to a third end of the secondary winding 320;

[0089] The second end of the first secondary switch unit 510, the second end of the second secondary switch and the second end of the secondary capacitor Cc are grounded, or the second end of the first secondary switch unit 510 and the second end of the second secondary switch unit are connected to the second end of the secondary capacitor.

[0090] It should be noted that a secondary rectifier module 500 is also provided between the secondary winding 320 and the load, and the secondary rectifier module 500 includes a first secondary switch unit 510 and a second secondary switch unit 520, and the first secondary switch unit 510 and the second secondary switch unit 520 can be used for rectification to improve power supply stability. The first secondary switch unit 510 can be a switch tube unit or a plurality of switch tube units connected in parallel or a gallium nitride device; the second secondary switch unit 520 can also be a switch tube unit or a plurality of switch tube units connected in parallel or a gallium nitride device.

[0091] In this embodiment, refer to Figures 5 to 7 ,exist Figure 5 , Figure 6 and Figure 7 The second end of the first secondary switch unit 510, the second end of the second secondary switch and the second end of the secondary capacitor Cc are grounded.

[0092] Reference Figure 8 The second end of the first secondary switch unit 510 and the second end of the second secondary switch unit 520 may not be grounded, and the second end of the first secondary switch unit 510 and the second end of the second secondary switch unit 520 are connected to the second end of the secondary capacitor Cc.

[0093] Reference Fig. 9The first secondary switch unit may include a first secondary switch tube SQ1, a fifth body diode D5 and a fifth parasitic capacitor C5, which are connected in parallel to the drain and source of the first secondary switch tube SQ1, and the second secondary switch unit may include a second secondary switch tube SQ2, a sixth body diode D6 and a sixth parasitic capacitor C6, which are connected in parallel to the drain and source of the first secondary switch tube SQ1. The drain of the first secondary switch unit 510 is connected to the first end of the secondary winding 320, the source of the first secondary switch unit is connected to the first end of the secondary capacitor Cc, the first end and the second end of the secondary capacitor Cc are connected to the load, the second end of the secondary capacitor Cc is connected to the third end of the secondary winding 320, the second end of the secondary winding 320 is connected to the drain of the second secondary switch unit 520, and the source of the second secondary switch unit 520 is connected to the source of the first secondary switch unit 510.

[0094] In a possible embodiment, please refer to Figure 7 , when the second end of the first secondary switch unit, the second end of the second secondary switch, and the second end of the secondary capacitor are grounded, the power supply device further includes a control module, the control module includes a control unit 610, a microcontroller power supply 620, and a drive circuit;

[0095] The microcontroller power supply 620 is connected to the control unit 610 and the driving circuit, the control unit 610 is connected to the driving circuit, and the driving circuit is connected to the third end of the first secondary side switch unit 510 and the third end of the second secondary side switch unit 520;

[0096] The control unit 610 is used to control the on and / or off of the first secondary switch unit 510 through the driving circuit, and is also used to control the on and / or off of the second secondary switch unit 520 through the driving circuit.

[0097] It should be noted that the control unit 610 may be a microcontroller, the microcontroller power supply 620 is used to power the control unit 610, the drive circuit is used to amplify the small signal output to the microcontroller, and improve the drive voltage and drive current to achieve the ability to drive the MOS tube. The drive circuit can be divided into a first drive circuit 631 and a second drive circuit 632. The first drive circuit 631 is connected to the third end of the first secondary switch unit 510. For example, the first drive circuit 631 can be connected to the gate of the switch tube in the first secondary switch unit 510. The second drive circuit 632 is connected to the third end of the second secondary switch unit 520. For example, the second drive circuit 632 can be connected to the gate of the second secondary switch unit 520. The microcontroller power supply 620 can also be connected to the first drive circuit 631 and the second drive circuit 632, and the microcontroller power supply 620 can also power the first drive circuit 631 and the second drive circuit 632.

[0098] The control unit 610 can be connected to the first drive circuit 631 and the second drive circuit 632. The control unit 610 can control the conduction and / or disconnection of the first secondary side switch unit 510 through the first drive circuit 631, and can also control the conduction and / or disconnection of the second secondary side switch unit 520 through the second drive circuit 632.

[0099] Since in the present embodiment, the second end of the first secondary switch unit 510, the second end of the second secondary switch and the second end of the secondary capacitor Cc are grounded, the first secondary switch unit 510, the second secondary switch unit 520 and the secondary capacitor Cc can be grounded together, so that the first drive circuit 631 does not need to be additionally connected to a drive power supply to drive the first secondary switch unit 510, and the second drive circuit 632 does not need to be additionally connected to a drive power supply to drive the second secondary switch unit 520.

[0100] Further, see Fig. 9 , when the second end of the first secondary switch unit and the second end of the second secondary switch are connected to the second end of the secondary capacitor, the power supply device further includes a control module, and the control module includes a control unit 610, a microcontroller power supply 620, an isolation power supply X3, and an isolation chip;

[0101] The microcontroller power supply 620 is connected to the control unit 610, the control unit 610 is connected to the isolation chip, the isolation chip is connected to the third end of the first secondary switch unit 510 and the third end of the second secondary switch unit 520, and the isolation power supply X3 is connected to the isolation chip;

[0102] The control unit 610 is used to control the on and / or off of the first secondary switch unit 510 through the isolation chip, and is also used to control the on and / or off of the second secondary switch unit 520 through the isolation chip.

[0103] It should be noted that the isolation chip includes a first isolation chip X1 and a second isolation chip X2. The first isolation chip X1 is used to drive the first secondary switch unit 510 to be turned on or off, and the second isolation chip X2 is used to drive the second secondary switch unit 520 to be turned on or off.

[0104] For a better understanding of this embodiment, please refer to Figure 7 and Fig. 9 , Figure 7 The circuit connection diagram of the secondary rectifier module 500 and the control module is shown when the first secondary switch unit 510, the second secondary switch unit 520 and the secondary capacitor Cc are connected to the same ground. Fig. 9The circuit connection diagram of the secondary rectifier module 500 and the control module is shown when the first secondary switch unit 510, the second secondary switch unit 520 and the secondary capacitor Cc are not grounded together; Figure 7 and Fig. 9 For comparison and explanation. Figure 7 and Fig. 9 In the description, the first secondary switch unit 510 and the second secondary switch unit 520 are both a switch tube unit. Since the first secondary switch unit 510, the second secondary switch unit 520 and the secondary capacitor Cc are not grounded together, it is necessary to use the first isolation chip X1 to realize the driving of the first secondary switch unit 510, and the second isolation chip X2 to realize the driving of the second secondary switch unit 520. The first isolation chip X1 and the second isolation chip X2 are both connected to the microcontroller. The first isolation chip X1 and the second isolation chip X2 cannot share the same power supply with the microcontroller. It is necessary to add an additional isolation power supply X3 to power the isolation chip through the isolation power supply, so as to drive the first secondary switch unit through the first isolation chip and drive the second secondary switch unit through the second isolation chip.

[0105] exist Fig. 9 The circuit connection diagram shown in FIG. 1 shows a microcontroller power supply 620 and an isolated power supply. Figure 7 The circuit connection diagram shown, Fig. 9 The corresponding circuit increases the circuit cost, and due to the characteristics of the optical coupling isolation in the first isolation chip and the second isolation chip, the cost of the first isolation chip and the second isolation chip is higher than that of the non-isolated driving circuit. Figure 7 In the circuit connection diagram shown, the second end of the first secondary switch unit 510, the second end of the second secondary switch, and the second end of the secondary capacitor Cc are all grounded (see Figure 7 ), so that the drive circuit can share a power supply with the microcontroller, reducing costs. Figure 7 In FIG. 1 , an arrow drawn from the first driving circuit indicates driving the first secondary switch unit, and an arrow drawn from the second driving circuit indicates driving the second secondary switch unit. Fig. 9 In the figure, the arrow drawn from the first isolation chip indicates driving the first secondary side switch unit, and the arrow drawn from the second isolation chip indicates driving the second secondary side switch unit.

[0106] The first secondary side switch unit 510 is a switch tube unit or a plurality of switch tube units connected in parallel or a gallium nitride device; the second secondary side switch unit 520 is a switch tube unit or a plurality of switch tube units connected in parallel or a gallium nitride device.

[0107] It should be noted that the switch tube unit includes a switch tube, and a body diode and a capacitor connected in parallel to the source and drain of the switch tube. Since the on-resistance of the switch tube and the gallium nitride device is small, the on-loss of the switch tube and the gallium nitride device is small. When the first secondary switch unit 510 is a switch tube unit, or a plurality of switch tube units connected in parallel, or a gallium nitride device, and the second secondary switch unit 520 is a switch tube unit, or a plurality of switch tube units connected in parallel, or a gallium nitride device, the energy output by the secondary winding 320 can be reduced in the first secondary switch unit 510 and the second secondary switch unit 520. Losses can be reduced to improve the efficiency of powering the entire server. The switch tube can be a MOS tube. For example, you can refer to Figure 6 , Figure 6 The diagram shows a circuit connection diagram of the secondary rectifier module 500 when both the first secondary switch unit 510 and the second secondary switch unit 520 are one switch tube unit.

[0108] For example, when the current output by the secondary winding 320 is 10A, a MOS tube with an internal resistance of 10mΩ can be selected in the first secondary switch unit 510 and the second secondary switch unit 520, and its conduction voltage drop is only 0.1V. When the current output by the secondary winding 320 is 20A, a MOS tube with an internal resistance of 5mΩ can be selected in the first secondary switch unit 510 and the second secondary switch unit 520, and its conduction voltage drop is also 0.1V. Compared with the use of Schott diodes (the conduction voltage drop of Schott diodes is 0.3V) for rectification in the prior art, the present embodiment uses switch tubes for rectification, which can reduce conduction losses.

[0109] Since the cost of a switch tube with a smaller internal resistance is higher, when a switch tube with a smaller internal resistance is needed, the first secondary switch unit 510 and the second secondary switch unit 520 can be a plurality of switch tube units connected in parallel to reduce the internal resistance of the first secondary switch unit 510 and the second secondary switch unit 520, thereby reducing the conduction loss of the first secondary switch unit 510 and the second secondary switch unit 520. Compared with the prior art in which a diode is connected to the secondary winding 320 to achieve rectification, in this embodiment, the first secondary switch unit 510 and the second secondary switch unit 520 are set as a switch tube, a plurality of switch tubes connected in parallel or a gallium nitride device, thereby reducing the conduction loss.

[0110] Based on the above embodiments, refer to Fig.10 and Fig.11 , the zero voltage conduction process of the soft switch unit 210 is briefly described: Fig.10 This is the overall circuit connection diagram of the power supply device. Fig.11, the conduction curve of the soft switch unit 210, the variation curve of the excitation current, the variation curve of the resonant current, the curve of the voltage across the first secondary switch unit 510, and the current curve of the first secondary switch unit 510 are shown, wherein the voltage curve across the first secondary switch unit 510 may refer to the voltage between the source and the drain of the first secondary switch unit 510. Fig.11 , U1 is the voltage across the first secondary switch unit 510 , and I1 is the current of the first secondary switch unit 510 . Fig.11 The horizontal axis represents time, and the vertical axis represents level. During the period from t0 to t4, S1 and S4 are turned on, and S2 and S3 are turned off. After the resonant inductor Lr is demagnetized at time t1, the direction of the resonant current Ir changes from negative to positive, that is, the resonant current changes from a preset positive direction to a preset negative direction. The excitation current Im changes from negative to positive at time t2, that is, from a preset positive direction to a preset negative direction. During the period from t0 to t2, energy is provided to the load 400 through the primary winding 310 of the transformer 300. During the period from t2 to t3, the primary winding 310 of the transformer 300 is excited through the power supply 100. During t3 to t4, neither the power supply 100 nor the primary winding 310 of the transformer 300 provides energy to the load 400. During t4 to t5, S1, S2, S3, and S4 are all turned off, and the resonant current Ir maintains the current direction at t4, which is the preset positive direction. At this time, the switching voltages of S2 and S3 can be reduced, and S2 and S3 can be turned on with zero voltage to realize the zero-voltage turn-on soft switching unit 210. exist Fig.11 In the figure, S1ON means S1 is on, S2ON means S2 is on, S3ON means S3 is on, and S4ON means S4 is on.

[0111] Specifically, during the period from t0 to t1: at time t0, S1 and S4 begin to conduct (when the switch tube in the soft switch unit 210 is turned on, Figure 7 At this time, the first body diode D1 of S1 and the fourth body diode D4 of S4 are in the freewheeling conduction state, S1 and S4 are turned on with zero voltage, and in the period t0-t1, the excitation current Im is the preset negative direction, and can provide energy to the load 400 through the excitation inductor Lm, the first secondary side switch unit 510 is turned on, and the second secondary side switch unit 520 is turned off.

[0112] During the period t1 to t2: S1 and S4 continue to remain in the on state. At time t1, the resonant current Ir changes to the preset positive direction, and the excitation current Im continues to decrease in the preset negative direction. The power supply 100 and the excitation inductor Lm jointly provide energy for the load 400. The first secondary switch unit 510 is turned on, and the second secondary switch unit 520 is turned off.

[0113] Time period t2-t3: At time t2, the excitation current Im becomes a preset positive direction, which is the same as the resonant current Ir. At this time, the power supply 100 can increase the energy to the excitation inductance Lm, and the power supply 100 can also provide energy to the load 400. The first secondary side switch unit 510 is turned on, and the second secondary side switch unit 520 is turned off.

[0114] During the period t3 to t4, the resonant current Ir and the excitation current Im remain equal, the resonant inductance Lr, the excitation inductance Lm, and the resonant capacitor Cr form a resonance, so that the resonant circuit is in a preset quasi-resonant state, the current of the primary winding 310 of the transformer 300 drops to 0, and no energy is transferred to the load 400, the first secondary switch unit 510 and the second secondary switch unit 520 are both cut off, and the energy output to the load 400 is provided by the secondary capacitor Cc.

[0115] t4~t5 period: t4~t5 is the dead time, S1~S4 are all turned off (refer to Figure 7 During the time periods t4 and t5, S1~S4 are all at a low level), and the resonant current is in a preset forward direction. Under the action of the preset forward resonant current, the power supply 100 charges the first parasitic capacitor C1 of S1 and the fourth parasitic capacitor of S4, and discharges the second parasitic capacitor of S2 and the third parasitic capacitor of S3. At this time, the second secondary side switch unit 520 is turned on. After the second parasitic capacitor and the third parasitic capacitor are discharged, the second body diode D2 of S2 and the third body diode D3 of S3 continue to flow, so that S2 and S3 are turned on with zero voltage at time t5.

[0116] In a feasible embodiment, the control unit 610 is further used to collect the output voltage and output current output by the secondary rectifier module 500, and the control unit 610 is further used to control the conduction duty cycle of the soft switch unit 210 based on the output voltage and output current;

[0117] The control unit 610 is also used to collect the first temperature of the primary soft switch module 200 and the second temperature of the secondary rectifier module 500, and is also used to control the soft switch unit 210 to disconnect when the first temperature is greater than a preset temperature threshold, and to control the first secondary switch unit 510 and the second secondary switch unit 520 in the secondary rectifier module 500 to disconnect when the second temperature is greater than a preset temperature threshold.

[0118] It should be noted that the control unit 610 can be used to collect the output voltage and output current output by the secondary rectifier module 500, and can adjust the on-duty ratio of the soft switch unit 210 in the voltage conversion unit based on the output current and the output voltage, so as to feedback and adjust the output voltage of the secondary rectifier module 500. For example, the control unit 610 can adjust the on-duty ratio of the soft switch unit 210 based on the voltage difference between the output voltage and the preset voltage threshold. The preset voltage threshold can be set based on actual conditions, and the preset voltage threshold can be the voltage required by the load 400. The mapping relationship between each voltage difference and the corresponding on-duty ratio can be stored in the control unit 610, so as to facilitate the control unit 610 to determine the corresponding on-duty ratio based on the voltage difference corresponding to the collected output voltage, so as to adjust the on-duty ratio of the soft switch unit 210. The higher the on-duty ratio, the longer the on-time of the soft switch unit 210. For another example, when the output current collected by the control unit 610 exceeds a preset current threshold, the on-duty cycle of the switch unit can be controlled to be zero to avoid burning the load 400 when the output current exceeds the preset current threshold.

[0119] The control unit 610 may also collect the first temperature of the primary soft switch module 200. The first temperature of the primary soft switch module 200 may be detected by a temperature sensor, or may be collected by a thermistor, etc., which is not specifically limited in this embodiment. The temperatures of multiple components in the primary soft switch module 200 may be collected, and the highest temperature collected in the primary soft switch module 200 may be used as the first temperature. For example, the temperatures of the first switch tube S1, the second switch tube S2, the third switch tube S3, the fourth switch tube S4, the resonant capacitor Cr, the excitation inductance Lm and / or the resonant inductance Lr in the primary soft switch module 200 may be collected. When the first temperature is greater than the preset temperature threshold, the soft switch unit 210 is controlled to be disconnected to prevent the soft switch unit 210 from being burned out.

[0120] The control unit 610 can also collect the second temperature of the secondary rectifier module 500, and can detect the second temperature of the secondary rectifier module 500 through a temperature sensor, and can collect the temperatures of multiple components in the secondary rectifier module 500, and use the highest temperature collected in the secondary rectifier module 500 as the second temperature. For example, the temperature of the first secondary switch unit 510, the second secondary switch unit 520, and / or the secondary capacitor Cc in the secondary rectifier module 500 can be collected. When the second temperature is greater than the preset temperature threshold, the first secondary switch unit 510 and the second secondary switch unit 520 are controlled to be disconnected to avoid the secondary rectifier module 500 from being burned, etc., so as to facilitate the safety of the circuit. For example, in this embodiment, the control unit 610 can be a microcontroller of Taiwei TAE32F5800.

[0121] In a possible embodiment, please refer to Fig.12, Fig.12 This is a structural diagram of a pluggable voltage conversion component 1000. The power supply device also includes: a power supply connector 700 arranged at the input end of the primary soft switch module 200, and a gold finger 800 arranged at the output end of the secondary rectifier module 500 connected to the secondary winding 320 of the transformer 300.

[0122] The transformer 300, the primary soft switch module 200, the secondary rectifier module 500, the control module, the gold finger 800 and the power supply connector 700 are integrated into a pluggable voltage conversion component 1000. The pluggable voltage conversion component 1000 is connected to the power supply 100 through the power supply connector 700, and the pluggable voltage conversion component 1000 is connected to the load through the gold finger 800.

[0123] It should be noted that the gold finger 800 can be connected to the server, the power supply connector 700 can be connected to the power supply 100, the transformer 300, the primary side soft switch module 200, the secondary side rectifier module 500, the control unit 610, the gold finger 800 and the power supply connector 700 can be integrated into a pluggable voltage conversion component 1000, and the pluggable voltage conversion component 1000 can be directly connected to the server, thereby improving the configuration convenience of the pluggable voltage conversion component 1000. Among them, the power supply 100 includes a power frame copper bus, and a power bus can be led out from the power frame copper bus, and the power bus can be connected to the power supply connector 700. Among them, the transformer 300, the primary side soft switch module 200, the secondary side rectifier module 500, and the control module can all be integrated on the carrier referred to by M1, and the carrier referred to by M1 can be a PCB (Printed Circuit Board) or the like. The gold finger 800 is Fig.12 The structure referred to by 800.

[0124] Since the power supply connector 700 is arranged at the input end of the pluggable voltage conversion component 1000 and the gold finger 800 is arranged at the output end of the pluggable voltage conversion component 1000, the pluggable voltage conversion component 1000 can be directly connected to the server through the gold finger 800, and the pluggable voltage conversion component 1000 can be directly connected to the power supply 100 through the power supply connector 700, so that the power supply 100 is directly connected to the server through the pluggable voltage module, and there is no need to add extra wires between the power supply 100 and the server, thereby reducing the loss of the transmission path between the power supply 100 and the server. In addition, since the voltage conversion unit in the pluggable voltage conversion component 1000 can convert the power supply voltage of the power supply 100 into the service voltage required by the server, the pluggable voltage conversion component 1000 can convert the power supply voltage of the power supply 100 into a service voltage that is more in line with the operation requirements of the server, thereby achieving the reduction of the loss of the transmission path between the power supply 100 and the server while supporting the operation of the server, and reducing the complexity of wiring, so that the pluggable voltage conversion component 1000 is easy to install on the server and easy to remove from the server. Among them, since the pluggable voltage conversion component 1000 includes a transformer 300, a primary side soft switch module 200, a secondary side rectifier module 500 and a control unit 610, the pluggable voltage conversion component 1000 can convert the power supply voltage of the power supply 100 into the voltage required by the server. For example, the 48V power supply 100 can be converted into 12V to power the server.

[0125] You can refer to Fig.13 The pluggable voltage conversion component can be integrated into the server machine 2000. The 12V power required by the components in the server machine 2000 can be directly drawn from the server frame busbar, thereby increasing the power input of the server machine 2000 from 12V to 48V, and the pluggable voltage conversion component 1000 can be directly connected to the power busbar led out from the power frame copper bus of the power supply 100, thereby eliminating the power cable and reducing the energy loss on the cable. It also has a load balancing function, so that each module works at a better efficiency point.

[0126] Furthermore, the 48V DC voltage of the power supply 100 forms an AC voltage after passing through the primary soft switch module 200. According to the magnetic effect of the current, the alternating current on the primary winding 310 of the transformer 300 generates a magnetic field, which is transmitted to the secondary winding 320 in the form of magnetic flux on the magnetic core. According to the Faraday principle, the secondary winding 320 generates an induced electromotive force and forms an induced current. That is, the primary winding 310 and the secondary winding 320 transfer energy through electromagnetic coupling, and there is no direct electrical connection, so as to achieve the purpose of protecting the circuit connected to the secondary winding 320, for example, the load 400 and the secondary rectifier module 500 can be protected. Therefore, even if the power supply 100 fails, or high voltage is accidentally introduced to damage the power supply 100, it will not be transmitted to the secondary winding 320 of the transformer 300, and the secondary rectifier module 500 connected to the secondary winding 320 and other components in the server machine 2000, which can protect the components in the server machine 2000 from being affected, thereby improving the safety and stability of the server system. The output voltage output by the secondary rectifier module 500 can power the components in the server machine 2000.

[0127] For further information, please refer to Fig.14 and Fig.15 , Fig.14 This is a simplified schematic diagram of the components in the server 2000 working in parallel when the transformer 300 is provided in the power supply device of this embodiment. Fig.15 This is a simplified schematic diagram of the parallel operation of the components in the server machine 2000 corresponding to the non-isolated circuit. Fig.14 and Fig.15 The 48V bus shown in the figure can be considered as the bus of the power supply 100, through which the power supply 100 can provide power, and the 12V bus can be considered as the bus corresponding to the server cabinet, which can include a server machine 2000, and each server machine 2000 can be configured with a pluggable voltage conversion component 1000. Fig.14 It can be seen that, since the power supply device in this embodiment is provided with a transformer 300, even if the servers 2000 work in parallel, no loop is formed between the servers 2000, thereby ensuring the stable operation of the servers 2000. Fig.15 It can be seen that when the server machines 2000 corresponding to the non-isolated circuit work in parallel, a loop will be formed between the two server machines 2000, which is similar to a short circuit, so that a circuit loop is generated between the two server machines 2000, affecting the operation of the server machines 2000.

[0128] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent processing scope of the present application.

Claims

1. A power supply device for a load, characterized in that: The power supply device includes a power supply, a transformer and a primary soft switch module, and the primary soft switch module includes a soft switch unit and a resonance unit; The power supply is connected to the soft switch unit, the soft switch unit is connected to the resonance unit, the resonance unit is connected to the primary winding of the transformer, and the secondary winding of the transformer is connected to the load; The resonance unit is used to reduce the switching voltage of a preset switch tube in the soft switching unit in a preset quasi-resonance state, and turn on the soft switching unit with zero voltage.

2. The load power supply device according to claim 1, characterized in that: The soft switch unit includes a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a first body diode, a second body diode, a third body diode, a fourth body diode, a first parasitic capacitor, a second parasitic capacitor, a third parasitic capacitor, and a fourth parasitic capacitor; The first body diode and the first parasitic capacitor are connected in parallel at the first end and the second end of the first switch tube, the second body diode and the second parasitic capacitor are connected in parallel at the first end and the second end of the second switch tube, the third body diode and the third parasitic capacitor are connected in parallel at the first end and the second end of the third switch tube, and the fourth body diode and the fourth parasitic capacitor are connected in parallel at the first end and the second end of the fourth switch tube; The first end of the first switch tube and the second end of the second switch tube are connected to the power supply, the first end of the first switch tube is connected to the first end of the third switch tube, and the second end of the second switch tube is connected to the second end of the fourth switch tube.

3. The load power supply device according to claim 2, characterized in that: The resonant unit includes a resonant capacitor, a resonant inductor and an excitation inductor; The first end of the resonant capacitor is connected to the first end of the excitation inductor, the second end of the resonant capacitor is connected to the first end of the fourth switch tube, the first end of the excitation inductor is connected to the first end of the primary winding, the second end of the excitation inductor is connected to the second end of the primary winding and the first end of the resonant inductor, and the second end of the resonant inductor is connected to the second end of the first switch tube; When the excitation current of the excitation inductor is equal to the resonant current of the resonant inductor, determining that the resonant unit is in a preset quasi-resonant state; When the direction of the resonant current of the resonance unit in the preset quasi-resonant state is a preset positive direction, the preset switch tubes in the soft switching unit are the second switch tube and the third switch tube; when the direction of the resonant current of the resonance unit in the preset quasi-resonant state is a preset negative direction, the preset switch tubes in the soft switching unit are the first switch tube and the fourth switch tube.

4. The load power supply device according to claim 1, characterized in that: The power supply device further includes: a secondary side rectifier module arranged between the secondary side winding and the load, the secondary side rectifier module including: a first secondary side switch unit, a second secondary side switch unit and a secondary side capacitor; The first end of the first secondary switch unit is connected to the first end of the secondary winding, the first end of the second secondary switch unit is connected to the second end of the secondary winding, and the first end of the secondary capacitor is connected to the third end of the secondary winding; The second end of the first secondary switch unit, the second end of the second secondary switch unit and the second end of the secondary capacitor are grounded, or the second end of the first secondary switch unit and the second end of the second secondary switch unit are connected to the second end of the secondary capacitor.

5. The load power supply device according to claim 4, characterized in that: When the second end of the first secondary switch unit, the second end of the second secondary switch, and the second end of the secondary capacitor are grounded, the power supply device further includes a control module, and the control module includes a control unit, a microcontroller power supply, and a drive circuit; The microcontroller power supply is connected to the control unit and the drive circuit, the control unit is connected to the drive circuit, and the drive circuit is connected to the third end of the first secondary switch unit and the third end of the second secondary switch unit; The control unit is used to control the on and / or off of the first secondary switch unit through the drive circuit, and is also used to control the on and / or off of the second secondary switch unit through the drive circuit.

6. The load power supply device according to claim 5, characterized in that: The control unit is further used to collect the output voltage and output current output by the secondary side rectifier module, and the control unit is further used to control the conduction duty cycle of the soft switch unit based on the output voltage and the output current; The control unit is also used to collect the first temperature of the primary soft switch module and the second temperature of the secondary rectifier module, and is also used to control the soft switch unit to disconnect when the first temperature is greater than a preset temperature threshold, and to control the first secondary switch unit and the second secondary switch unit in the secondary rectifier module to disconnect when the second temperature is greater than a preset temperature threshold.

7. The load power supply device according to claim 4, characterized in that: In a case where the second end of the first secondary switch unit and the second end of the second secondary switch are connected to the second end of the secondary capacitor, the power supply device further includes a control module, and the control module includes a control unit, a microcontroller power supply, an isolation power supply, and an isolation chip; The microcontroller power supply is connected to the control unit, the control unit is connected to the isolation chip, the isolation chip is connected to the third end of the first secondary switch unit and the third end of the second secondary switch unit, and the isolation power supply is connected to the isolation chip; The control unit is used to control the conduction and / or disconnection of the first secondary switch unit through the isolation chip, and is also used to control the conduction and / or disconnection of the second secondary switch unit through the isolation chip.

8. The load power supply device according to any one of claims 4 to 7, characterized in that: The first secondary side switch unit is a switch tube unit or a plurality of switch tube units connected in parallel or a gallium nitride device; The second secondary side switch unit is a switch tube unit or a plurality of switch tube units connected in parallel or a gallium nitride device.

9. The load power supply device according to claim 1, characterized in that: The power supply device further comprises: a power supply connector arranged at the input end of the primary soft switch module, and a gold finger arranged at the output end of the secondary rectifier module connected to the secondary winding of the transformer.

10. The load power supply device according to claim 9, characterized in that: The transformer, the primary side soft switch module, the secondary side rectifier module, the control module, the gold finger and the power supply connector are integrated into a pluggable voltage conversion component. The pluggable voltage conversion component is connected to the power supply through the power supply connector, and the pluggable voltage conversion component is connected to the load through the gold finger.

11. A centralized power supply system, characterized in that: The centralized power supply system comprises a power supply device for a load as described in any one of claims 1-10.

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