A power supply device applied to a server mainboard and a server

Abstract

The application discloses a power supply device applied to a server mainboard, and belongs to the technical field of servers. The power supply device comprises a multistage output filter circuit which is built by resistors, capacitors, inductors and voltage stabilizing devices, is used for supplying power to the server mainboard, and is used for performing multistage filter processing on the output voltage of a target power supply in the principle of reducing the ripple of the output voltage of the target power supply to the maximum extent, so as to obtain a filter voltage. A feedback circuit is connected with the multistage output filter circuit and is used for transmitting the filter voltage to a control circuit. The control circuit is connected with the feedback circuit and is used for regulating and controlling the filter voltage by using a PWM wave, so that the ripple of the filter voltage satisfies a preset condition. By the power supply device, the design cost of the power supply of the server mainboard can be reduced, and the space volume occupied by the server mainboard can also be reduced. Correspondingly, a server provided by the application also has the beneficial effects.

Description

Technical Field

[0001] This invention relates to the field of server technology, and in particular to a power supply device for a server motherboard and a server. Background Technology

[0002] With the development of integrated circuits, technologies such as dual-CPU (Central Processing Unit) motherboards, GPU (Graphics Processing Unit) cards, and multiple PCIe (peripheral component interconnect express) cards are widely used on server motherboards.

[0003] Because components such as CPUs and GPUs have high requirements for power supply output ripple, current technologies typically employ relatively expensive PFC (Power Factor Correction) circuits, buck converter circuits, and LC filter circuits (filter circuits composed of inductors and capacitors) to reduce the power supply output ripple. However, the output voltage ripple of these filter circuits is usually above 100mV, which cannot meet the power supply requirements of electronic components such as CPUs and GPUs on server motherboards. Therefore, additional complex filter circuits are needed on the server motherboard to reduce the power supply output ripple to the requirements of the CPU, GPU, and other components on the server motherboard. This not only leads to high design costs for server motherboard power supplies, but also the filter circuits occupy a significant amount of space on the server motherboard, further increasing the motherboard's footprint. Currently, there is no effective solution to this technical problem.

[0004] Therefore, it is evident that how to reduce the design cost of server motherboard power supplies while also reducing the space occupied by the server motherboard is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of this invention is to provide a power supply device for a server motherboard and a server, so as to reduce the design cost of the server motherboard power supply and also reduce the space occupied by the server motherboard. The specific solution is as follows:

[0006] A power supply device for use on a server motherboard, comprising:

[0007] A multi-stage output filter circuit, constructed from resistors, capacitors, inductors, and voltage regulators, is used to supply power to the server motherboard. Based on the principle of minimizing the ripple of the target power supply's output voltage, it performs multi-stage filtering on the target power supply's output voltage to obtain a filtered voltage.

[0008] A feedback circuit, connected to the multi-stage output filter circuit, is used to transmit the filtered voltage to the control circuit;

[0009] The control circuit is connected to the feedback circuit and uses a PWM wave to regulate the filter voltage so that the ripple of the filter voltage meets a preset condition.

[0010] Preferred options also include:

[0011] An energy transfer circuit, connected to the multi-stage output filter circuit and the control circuit, is used to transfer the output voltage of the target power supply to the multi-stage output filter circuit.

[0012] Preferably, the energy transfer circuit includes: a first transformer, a second transformer, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first NMOS transistor, and a second NMOS transistor;

[0013] In this configuration, the first terminal of the secondary winding of the first transformer is connected to the first terminal of the first resistor; the second terminal of the first resistor is connected to the gate of the first NMOS transistor; the source of the first NMOS transistor is connected to the second terminal of the secondary winding of the first transformer; the drain of the first NMOS transistor is connected to the second terminal of the primary winding of the second transformer; the first terminal of the primary winding of the second transformer is connected to the first terminal of the first capacitor; the second terminal of the first capacitor is grounded; the first terminal of the first capacitor is connected to the target power supply; and the first terminal of the first winding of the secondary side of the second transformer is connected to the first terminal of the second resistor, the first terminal of the second winding of the secondary side of the second transformer, and the third... The first end of the resistor is connected to the drain of the second NMOS transistor. The second end of the first winding of the secondary side of the second transformer is grounded. The second end of the second resistor is connected to the first end of the second capacitor. The second end of the second capacitor is connected to the source of the second NMOS transistor and the first end of the fourth capacitor. The second end of the fourth capacitor is connected to the first end of the fifth resistor. The second end of the fifth resistor is grounded. The second end of the second winding of the secondary side of the second transformer is connected to the first end of the third capacitor. The second end of the third capacitor is connected to the first end of the fourth resistor. The second end of the fourth resistor is connected to the second end of the third resistor and the gate of the second NMOS transistor.

[0014] Preferably, the multi-stage output filter circuit includes: a first inductor, a second inductor, a first Zener diode, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a sixth resistor, a seventh resistor, an eighth resistor, and a sampling circuit for sampling the voltage value of the first inductor.

[0015] Wherein, the second terminal of the sixth resistor is connected to the negative terminal of the first Zener diode, the first terminal of the sixth capacitor, and the first terminal of the first inductor, respectively; the positive terminal of the first Zener diode is connected to the first terminal of the fifth capacitor; the second terminal of the first inductor is connected to the first terminal of the second inductor and the first terminal of the seventh capacitor, respectively; the second terminal of the second inductor is connected to the first terminal of the seventh resistor and the first terminal of the eighth capacitor, respectively; the second terminal of the seventh resistor is connected to the first terminal of the eighth resistor; and the second terminals of the fifth capacitor, the sixth capacitor, the seventh capacitor, the eighth resistor, and the eighth capacitor are all grounded.

[0016] Correspondingly, the first end of the sixth resistor is connected to the source of the second NMOS transistor, and the second end of the second inductor is used to output the voltage that supplies power to the server motherboard.

[0017] Preferably, the sampling circuit includes: a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a ninth capacitor, a tenth capacitor, and a voltage regulator chip;

[0018] Wherein, the first end of the ninth resistor is connected to the first end of the first inductor, the second end of the ninth resistor is connected to the first end of the tenth resistor, the second end of the tenth resistor is connected to the first end of the ninth capacitor, the first end of the twelfth resistor and the third end of the voltage regulator chip, the second end of the first inductor is connected to the first end of the eleventh resistor, the second end of the eleventh resistor is connected to the second end of the ninth capacitor, the first end of the tenth capacitor, the first end of the thirteenth resistor and the first end of the voltage regulator chip, the second end of the tenth capacitor is connected to the second end of the twelfth resistor, and the second ends of the tenth resistor, the voltage regulator chip and the thirteenth resistor are all grounded.

[0019] Preferably, the second inductor is a rod-shaped inductor.

[0020] Preferably, the feedback circuit includes: a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eleventh capacitor, a twelfth capacitor, and an operational amplifier;

[0021] Wherein, the second end of the fifteenth resistor is connected to the output end of the operational amplifier and the first end of the twelfth capacitor, the positive input end of the operational amplifier is connected to the first end of the eleventh capacitor and the first end of the sixteenth resistor, the negative input end of the operational amplifier is connected to the first end of the seventeenth resistor, the second end of the eleventh capacitor and the first end of the fourteenth resistor, the second end of the sixteenth resistor is used to receive the reference voltage, the second end of the fourteenth resistor is connected to the first end of the twelfth capacitor, and the second end of the twelfth capacitor is connected to the second end of the fifteenth resistor;

[0022] Accordingly, the first end of the fifteenth resistor is the output end of the feedback circuit, and the second end of the seventeenth resistor is used to receive the sampling voltage of the sampling circuit.

[0023] Preferably, the expression for the output voltage of the operational amplifier is:

[0024] U = 1 / C 12 R 14 ∫Vrefdt;

[0025] In the formula, U is the output voltage of the operational amplifier, and C 12 R is the capacitance value of the twelfth capacitor. 14 t is the resistance value of the fourteenth resistor, t is time, and Vref is the reference voltage.

[0026] Preferably, the control circuit includes: a PWM chip, a second Zener diode, an NPN transistor, a PNP transistor, a thirteenth capacitor, a fourteenth capacitor, a fifteenth capacitor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, and a twenty-third resistor.

[0027] In this configuration, the FB terminal of the PWM chip is connected to the negative terminal of the second Zener diode, the first terminal of the thirteenth capacitor, and the first terminal of the fifteenth resistor, respectively. The IS terminal of the PWM chip is connected to the first terminal of the twentieth resistor. The second terminal of the twentieth resistor, the second terminal of the thirteenth capacitor, and the positive terminal of the second Zener diode are all grounded. The OB terminal of the PWM chip is connected to the first terminal of the eighteenth resistor. The second terminal of the eighteenth resistor is connected to the first terminal of the nineteenth resistor. The second terminal of the nineteenth resistor is connected to VCC. The OC terminals of the PWM chip are all connected to the first terminal of the eleventh resistor. The second terminal of the eleventh resistor... The terminals are respectively connected to the base of the NPN transistor and the base of the PNP transistor. The collector of the NPN transistor is connected to the first terminal of the 23rd resistor. The second terminal of the 23rd resistor and the first terminal of the 14th capacitor are both connected to the target power supply. The second terminal of the 14th capacitor is grounded. The emitter of the NPN transistor is respectively connected to the first terminal of the 15th capacitor and the emitter of the PNP transistor. The collector of the PNP transistor is grounded. The second terminal of the 15th capacitor is connected to the first terminal of the 22nd resistor. The second terminal of the 22nd resistor is connected to the first terminal of the primary winding of the first transformer.

[0028] Accordingly, the present invention also discloses a server, including a power supply device for a server motherboard as disclosed above.

[0029] As can be seen, the power supply device provided by this invention includes a multi-stage output filtering circuit, a feedback circuit, and a control circuit. The multi-stage output filtering circuit supplies power to the server motherboard. It filters the output voltage of the target power supply to minimize ripple, obtaining a filtered voltage. After the multi-stage filtering circuit obtains the filtered voltage, the feedback circuit transmits the filtered voltage to the control circuit. Upon receiving the filtered voltage from the feedback circuit, the control circuit uses a PWM wave to regulate the filtered voltage, ensuring that the filtered voltage output by the multi-stage filtering circuit meets preset conditions and supplies power to the server motherboard. Compared to existing technologies, since the filtering circuit for the target power supply in this power supply device is constructed using resistors, capacitors, inductors, and voltage regulators with lower design costs, the design cost of the server motherboard power supply can be significantly reduced. Furthermore, the filtered voltage output by this power supply device can directly power the server motherboard, eliminating the need for additional complex filtering circuits on the motherboard. Therefore, this power supply device also significantly reduces the space occupied by the server motherboard. Correspondingly, the server provided by this invention also possesses the aforementioned beneficial effects. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0031] Figure 1 This is a structural diagram of a power supply device applied to a server motherboard, provided in an embodiment of the present invention.

[0032] Figure 2 This is a structural diagram of another power supply device applied to a server motherboard provided in an embodiment of the present invention;

[0033] Figure 3 This is a structural diagram of another power supply device applied to a server motherboard provided in an embodiment of the present invention;

[0034] Figure 4 To Figure 3 The Bode plot shown is from a MATLAB simulation of the power supply unit used on a server motherboard. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Please see Figure 1 , Figure 1 This is a structural diagram of a power supply device applied to a server motherboard provided in an embodiment of the present invention. The power supply device includes:

[0037] The multi-stage output filter circuit 11 is constructed from resistors, capacitors, inductors and voltage regulators. It is used to supply power to the server motherboard and performs multi-stage filtering on the output voltage of the target power supply to obtain the filtered voltage, based on the principle of minimizing the ripple of the output voltage of the target power supply.

[0038] Feedback circuit 12 is connected to multi-stage output filter circuit 11 and is used to transmit the filtered voltage to control circuit 13;

[0039] The control circuit 13 is connected to the feedback circuit 12 and uses PWM waves to regulate the filter voltage so that the ripple of the filter voltage meets the preset conditions.

[0040] In this embodiment, a power supply device for a server motherboard is provided. This power supply device can not only reduce the design cost of the server motherboard power supply, but also reduce the space occupied by the server motherboard.

[0041] This power supply device includes a multi-stage output filter circuit 11, a feedback circuit 12, and a control circuit 13. The multi-stage output filter circuit 11 is constructed from resistors, capacitors, inductors, and voltage regulators. It supplies power to the server motherboard and performs multi-stage filtering on the target power supply's output voltage to minimize its ripple. In other words, the multi-stage output filter circuit 11 contains multiple filter circuits that perform multi-stage filtering on the target power supply's output voltage, thereby minimizing its ripple.

[0042] It is conceivable that since the multi-stage output filter circuit 11 is the most important component of the server motherboard power supply, and the multi-stage output filter circuit 11 is composed of resistors, capacitors, inductors and voltage regulators, and resistors, capacitors, inductors and voltage regulators are all common electronic components in practical applications and have relatively low manufacturing costs, the design cost required for the server motherboard power supply can be significantly reduced by using resistors, capacitors, inductors and voltage regulators to build the multi-stage output filter circuit 11.

[0043] After the multi-stage output filter circuit 11 performs multi-stage filtering on the output voltage of the target power supply to obtain the filtered voltage, the feedback circuit 12 transmits the filtered voltage output by the multi-stage output filter circuit 11 to the control circuit 13. When the control circuit 13 receives the filtered voltage fed back from the feedback circuit 12, the control circuit 13 uses PWM (Pulse Width Modulation) waves to regulate the filtered voltage output by the multi-stage output filter circuit 11, and ensures that the ripple of the filtered voltage output by the multi-stage output filter circuit 11 meets the preset conditions, so as to meet the power supply requirements for powering the server motherboard.

[0044] It should be noted that the preset conditions are set based on the requirements of the components on the server motherboard that have relevant requirements for the ripple of the power supply voltage. During the process of regulating the filter voltage output by the multi-stage output filter circuit 11 using the PWM wave, the control circuit 13 adjusts the duty cycle of the PWM wave in real time according to the filter voltage output by the multi-stage output filter circuit 11, so that the ripple of the filter voltage output by the multi-stage output filter circuit 11 can meet the preset conditions, thereby enabling the filter voltage output by the multi-stage output filter circuit 11 to supply power to the server motherboard.

[0045] It is conceivable that in this power supply device, since the ripple of the filtered voltage output by the multi-stage output filter circuit 11 meets the preset conditions, the server motherboard only needs to perform a simple voltage reduction process on the filtered voltage output by the multi-stage output filter circuit 11 to power the CPU, GPU, and other devices on the server motherboard. Compared with existing technologies, this setup eliminates the cumbersome process of adding complex filtering circuits to the server motherboard to power it, thus significantly reducing the space occupied by the server motherboard.

[0046] As can be seen, the power supply device provided in this embodiment includes a multi-stage output filtering circuit, a feedback circuit, and a control circuit. The multi-stage output filtering circuit supplies power to the server motherboard. It filters the output voltage of the target power supply to minimize ripple, obtaining a filtered voltage. After the multi-stage filtering circuit obtains the filtered voltage, the feedback circuit transmits the filtered voltage to the control circuit. Upon receiving the filtered voltage from the feedback circuit, the control circuit uses a PWM wave to regulate the filtered voltage, ensuring that the filtered voltage output by the multi-stage filtering circuit meets preset conditions and supplies power to the server motherboard. Compared to existing technologies, since the filtering circuit for the target power supply in this power supply device is constructed using resistors, capacitors, inductors, and voltage regulators with lower design costs, the design cost of the server motherboard power supply can be significantly reduced. Furthermore, the filtered voltage output by this power supply device can directly power the server motherboard, thus eliminating the need for an additional complex filtering circuit on the server motherboard to power it. Therefore, using this power supply device can also significantly reduce the space occupied by the server motherboard.

[0047] Based on the above embodiments, this embodiment further explains and optimizes the technical solution. Please refer to [link / reference]. Figure 2 , Figure 2 This is a structural diagram of another power supply device applied to a server motherboard provided in an embodiment of the present invention. In a preferred embodiment, the power supply device further includes:

[0048] The energy transfer circuit 14 is connected to the multi-stage output filter circuit 11 and the control circuit 13, and is used to transfer the output voltage of the target power supply to the multi-stage output filter circuit 11.

[0049] Understandably, in practical applications, in order to maintain the balance of energy transfer, the voltage output by the target power supply is usually not directly input into the multi-stage output filter circuit 11. Instead, it is transferred to the multi-stage output filter circuit 11 through relevant circuit modules.

[0050] Therefore, in this embodiment, an energy transfer circuit 14 is also provided in the power supply device, which can transfer the output voltage of the target power supply to the multi-stage output filter circuit 11, so that the multi-stage output filter circuit 11 can better filter the output voltage of the target power supply.

[0051] Please see Figure 3 , Figure 3 This is a structural diagram of another power supply device applied to a server motherboard provided by an embodiment of the present invention. In a preferred embodiment, the energy transfer circuit 14 includes: a first transformer T1, a second transformer T2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a first NMOS transistor Q1, and a second NMOS transistor Q2;

[0052] In this configuration, the first terminal of the secondary winding of the first transformer T1 is connected to the first terminal of the first resistor R1. The second terminal of the first resistor R1 is connected to the gate of the first NMOS transistor Q1. The source of the first NMOS transistor Q1 is connected to the second terminal of the secondary winding of the first transformer T1. The drain of the first NMOS transistor Q1 is connected to the second terminal of the primary winding of the second transformer T2. The first terminal of the primary winding of the second transformer T2 is connected to the first terminal of the first capacitor C1. The second terminal of the first capacitor C1 is grounded. The first terminal of the first capacitor C1 is connected to the target power supply. The first terminal of the first winding of the secondary side of the second transformer T2 is connected to the first terminal of the second resistor R2, the first terminal of the second winding of the secondary side of the second transformer T2, and the third resistor R... The first terminal of capacitor C2 is connected to the drain of the second NMOS transistor Q2. The second terminal of the first winding of the secondary side of the second transformer T2 is grounded. The second terminal of the second resistor R2 is connected to the first terminal of the second capacitor C2. The second terminal of the second capacitor C2 is connected to the source of the second NMOS transistor Q2 and the first terminal of the fourth capacitor C4. The second terminal of the fourth capacitor C4 is connected to the first terminal of the fifth resistor R5. The second terminal of the fifth resistor R5 is grounded. The second terminal of the second winding of the secondary side of the second transformer T2 is connected to the first terminal of the third capacitor C3. The second terminal of the third capacitor C3 is connected to the first terminal of the fourth resistor R4. The second terminal of the fourth resistor R4 is connected to the second terminal of the third resistor R3 and the gate of the second NMOS transistor Q2.

[0053] This embodiment provides a structural diagram of an energy transfer circuit 14. Figure 3 The energy transfer circuit 14 shown includes an NMOS transistor (N-Metal-Oxide-Semiconductor), a transformer, a resistor, and a capacitor. The output voltage U of the target power supply can be transferred to the secondary side of the second transformer T2 in the energy transfer circuit 14, and then transferred from the secondary side of the second transformer T2 to the multi-stage output filter circuit 11 connected to the energy transfer circuit 14.

[0054] It is worth noting that in the energy transfer circuit 14 provided in this embodiment, the second resistor R2 and the second capacitor C2 can form an RC circuit (Resistor Capacitance Circuit). Furthermore, the RC circuit formed by the second resistor R2 and the second capacitor C2 can easily filter the output voltage of the target power supply, thus relatively reducing the ripple of the target power supply U's output voltage. When using... Figure 3 After the energy transfer circuit 14 performs a simple filter on the output voltage of the target power supply, it will transfer the voltage output by the target power supply U to the multi-stage output filter circuit 11, and the multi-stage output filter circuit 11 will perform a deeper level of filtering on the output voltage of the target power supply U.

[0055] Furthermore, the fourth capacitor C4 and the fifth resistor R5 are connected in series between the positive and negative terminals of the output of the energy transfer circuit. Together with the RC circuit composed of the second resistor R2 and the second capacitor C2, they can fully absorb the overshoot voltage on the secondary side of the second transformer T2. This can significantly reduce the voltage spikes and current spikes generated by the second NMOS transistor Q2 during operation, thereby enabling better filtering of the output voltage of the target supply voltage U.

[0056] Please see Figure 3 , Figure 3 This is a structural diagram of another power supply device applied to a server motherboard provided by an embodiment of the present invention. In a preferred embodiment, the multi-stage output filter circuit 11 includes: a first inductor L1, a second inductor L2, a first Zener diode D1, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, and a sampling circuit for sampling the voltage value of the first inductor L1.

[0057] Specifically, the second terminal of the sixth resistor R6 is connected to the negative terminal of the first Zener diode D1, the first terminal of the sixth capacitor C6, and the first terminal of the first inductor L1. The positive terminal of the first Zener diode D1 is connected to the first terminal of the fifth capacitor C5. The second terminal of the first inductor L1 is connected to the first terminal of the second inductor L2 and the first terminal of the seventh capacitor C7. The second terminal of the second inductor L2 is connected to the first terminal of the seventh resistor R7 and the first terminal of the eighth capacitor C8. The second terminal of the seventh resistor R7 is connected to the first terminal of the eighth resistor R8. The second terminals of the fifth capacitor C5, the sixth capacitor C6, the seventh capacitor C7, the eighth resistor R8, and the eighth capacitor C8 are all grounded.

[0058] Correspondingly, the first end of the sixth resistor R6 is connected to the source of the second NMOS transistor, and the second end of the second inductor L2 is used to output the voltage that supplies power to the server motherboard.

[0059] This embodiment provides a structural diagram of a multi-stage output filter circuit 11, which is composed of relatively inexpensive resistors, capacitors, inductors, and voltage regulators. Figure 3 The multi-stage output filter circuit 11 shown contains three stages of filtering. Specifically, the first-stage output filter circuit consists of a sixth resistor R6 and a sixth capacitor C6. The transfer function of the first-stage output filter circuit is expressed as:

[0060] g1 = 1 / (R6*SC6+1);

[0061] In the formula, g1 is the transfer function of the first-stage output filter circuit, R6 is the resistance value of the sixth resistor R6, C6 is the capacitance value of the sixth capacitor, and S is the transformation factor.

[0062] The second-stage output filter circuit consists of the first inductor L1, the seventh capacitor C7, and the eighth capacitor C8. The transfer function of the second-stage output filter circuit is expressed as follows:

[0063] g2=R / [S 2 L1(C7+C8)R+SL1+R];

[0064] In the formula, g2 is the transfer function of the second-stage output filter circuit, R is the maximum load value of the multi-stage output filter circuit at full power output, L1 is the inductance value of the first inductor L1, C7 is the capacitance value of the seventh capacitor C7, C8 is the capacitance value of the eighth capacitor C8, and S is the transformation factor.

[0065] The third-stage output filter circuit consists of the second inductor L2 and the eighth capacitor C8. The transfer function of the third-stage output filter circuit is expressed as follows:

[0066] g3=R / (S 2 L2C8R+SL2+R);

[0067] In the formula, g3 is the transfer function of the third-stage output filter circuit, R is the maximum load value of the multi-stage output filter circuit at full power output, L2 is the inductance value of the second inductor L2, C8 is the capacitance value of the eighth capacitor C8, and S is the transformation factor.

[0068] Therefore, the expression for the overall transfer function of the multi-stage output filter circuit is:

[0069] g = 1 / (R6*SC6+1)*R / [S 2L1(C7+C8)R+SL1+R]*R / (S 2 L2C8R+SL2+R);

[0070] In the formula, g is the total transfer function of the multi-stage output filter circuit, R6 is the resistance value of the sixth resistor R6, C6 is the capacitance value of the sixth capacitor, S is the transformation factor, R is the maximum load value of the multi-stage output filter circuit at full power output, L1 is the inductance value of the first inductor L1, C7 is the capacitance value of the seventh capacitor C7, C8 is the capacitance value of the eighth capacitor C8, and L2 is the inductance value of the second inductor L2.

[0071] pass Figure 3 The multi-stage output filter circuit 11 shown can perform three-stage filtering on the voltage output by the target power supply U. This can filter out interference signals, high-frequency ripple, etc. in the output voltage of the target power supply U. Under these conditions, the multi-stage output filter circuit 11 can output a voltage with lower ripple.

[0072] It should be noted that in practical applications, both the seventh capacitor C7 and the eighth capacitor C8 can be set as aluminum electrolytic capacitors. This is because aluminum electrolytic capacitors have ideal high-frequency and low-impedance characteristics compared to other types of capacitors, especially with excellent high-frequency filtering effect and strong anti-ripple current capability. Therefore, when the seventh capacitor C7 and the eighth capacitor C8 are set as aluminum electrolytic capacitors, the filtering effect of the multi-stage output filter circuit 11 on the target power supply output voltage can be further improved.

[0073] In addition, the second inductor L2 can be set as a rod-shaped inductor. This is because rod-shaped inductors not only have good energy storage effect, but also have the advantages of low loss and good heat resistance. Therefore, when the second inductor L2 is set as a rod-shaped inductor, the temperature rise of the multi-stage output filter circuit 11 during operation can be greatly reduced, thereby reducing the energy loss of the multi-stage output filter circuit 11.

[0074] Please see Figure 3 , Figure 3 This is a structural diagram of another power supply device applied to a server motherboard provided by an embodiment of the present invention. In a preferred embodiment, the sampling circuit includes: a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a ninth capacitor C9, a tenth capacitor C10, and a voltage regulator chip IC1;

[0075] Specifically, the first end of the ninth resistor R9 is connected to the first end of the first inductor L1, the second end of the ninth resistor R9 is connected to the first end of the tenth resistor R10, the second end of the tenth resistor R10 is connected to the first end of the ninth capacitor C9, the first end of the twelfth resistor R12, and the third end of the voltage regulator chip IC1, the second end of the first inductor L1 is connected to the first end of the eleventh resistor R11, the second end of the eleventh resistor R11 is connected to the second end of the ninth capacitor C9, the first end of the tenth capacitor C10, the first end of the thirteenth resistor R13, and the first end of the voltage regulator chip IC1, the second end of the tenth capacitor C10 is connected to the second end of the twelfth resistor R12, and the second ends of the tenth resistor R10, the voltage regulator chip IC1, and the thirteenth resistor R13 are all grounded.

[0076] This embodiment provides a structural diagram of a sampling circuit. This sampling circuit includes a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a ninth capacitor C9, a tenth capacitor C10, and a voltage regulator chip IC1. Figure 3 The sampling circuit shown can acquire the voltage across the first inductor L1.

[0077] It is worth noting that the sampling circuit provided in this embodiment directly samples the voltage across the first inductor L1 in the multi-stage output filter circuit 11 and feeds the voltage across the first inductor L1 directly back to the feedback circuit 12. It is conceivable that, compared to sampling the voltage from the back end of the multi-stage output filter circuit, this voltage sampling method can detect changes in the target power supply U more accurately and quickly, thereby further improving the stability and reliability of the power supply device when supplying power to the server motherboard.

[0078] Please see Figure 3 , Figure 3 This is a structural diagram of another power supply device applied to a server motherboard provided by an embodiment of the present invention. In a preferred embodiment, the feedback circuit 12 includes: a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eleventh capacitor C11, a twelfth capacitor C12, and an operational amplifier U;

[0079] Specifically, the second terminal of the fifteenth resistor R15 is connected to the output terminal of the operational amplifier U and the first terminal of the twelfth capacitor C12. The positive input terminal of the operational amplifier U is connected to the first terminal of the eleventh capacitor C11 and the first terminal of the sixteenth resistor R16. The negative input terminal of the operational amplifier U is connected to the first terminal of the seventeenth resistor R17, the second terminal of the eleventh capacitor C11, and the first terminal of the fourteenth resistor R14. The second terminal of the sixteenth resistor R16 is used to receive the reference voltage. The second terminal of the fourteenth resistor R14 is connected to the first terminal of the twelfth capacitor C12. The second terminal of the twelfth capacitor C12 is connected to the second terminal of the fifteenth resistor R15.

[0080] Correspondingly, the first terminal of the fifteenth resistor R15 is the output terminal of the feedback circuit, and the second terminal of the seventeenth resistor R17 is used to receive the sampling voltage of the sampling circuit.

[0081] Because integrator circuits have advantages such as high sensitivity and short delay time, they can greatly improve the dynamic response performance of the circuit. Therefore, in this embodiment, an integrator circuit is used to build the feedback circuit 12. Figure 3 In the feedback circuit shown, the integrating circuit consists of operational amplifier U, twelfth capacitor C12, fourteenth resistor R14, and eleventh capacitor C11. When Figure 3 When the circuit structure shown is working, the sampling circuit can feed back the sampled voltage across the first inductor L1 to the negative input terminal of the operational amplifier U, and smoothly transmit the voltage signal across the first inductor L1 to the control circuit 13 through the integrating circuit composed of the operational amplifier U, the twelfth capacitor C12, the fourteenth resistor R14, and the eleventh capacitor C11.

[0082] In a preferred embodiment, the expression for the output voltage of the operational amplifier is:

[0083] U = 1 / C 12 R 14 ∫Vrefdt;

[0084] In the formula, U is the output voltage of the operational amplifier, and C... 12 R is the capacitance value of the twelfth capacitor. 14 t represents the resistance value of the fourteenth resistor, t represents time, and Vref represents the reference voltage.

[0085] It is understandable that when the sampling circuit feeds back the sampled voltage across the first inductor L1 to the negative input terminal of operational amplifier U, the voltage value at the negative input terminal of operational amplifier U is U. L1 U L1Let Vref be the voltage across the first inductor L1. The positive input terminal of operational amplifier U receives a reference voltage Vref. Therefore, the voltage at the positive input terminal of operational amplifier U is the reference voltage Vref. After integration, the voltage at the output terminal of operational amplifier U is U = 1 / C. 12 R 14 ∫Vrefdt.

[0086] Please see Figure 3 , Figure 3 This is a structural diagram of another power supply device applied to a server motherboard provided by an embodiment of the present invention. In a preferred embodiment, the control circuit 13 includes: a PWM chip IC2, a second Zener diode D2, an NPN transistor Q3, a PNP transistor Q4, a thirteenth capacitor C13, a fourteenth capacitor C14, a fifteenth capacitor C15, an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, a twenty-second resistor R22, and a twenty-third resistor R23.

[0087] Specifically, the FB terminal of PWM chip IC2 is connected to the negative terminal of the second Zener diode D2, the first terminal of the thirteenth capacitor C13, and the first terminal of the fifteenth resistor. The IS terminal of PWM chip IC2 is connected to the first terminal of the twentieth resistor R20. The second terminals of the twentieth resistor R20, the second terminal of the thirteenth capacitor C13, and the positive terminal of the second Zener diode D2 are all grounded. The OB terminal of PWM chip IC2 is connected to the first terminal of the eighteenth resistor R18. The second terminal of the eighteenth resistor R18 is connected to the first terminal of the nineteenth resistor R19. The second terminal of the nineteenth resistor R19 is connected to VCC. The OC terminals of PWM chip IC2 are all connected to the first terminal of the twenty-first resistor R21. The twenty-first resistor R21... The second terminal is connected to the base of NPN transistor Q3 and the base of PNP transistor Q4, respectively. The collector of NPN transistor Q3 is connected to the first terminal of the twenty-third resistor R23. The second terminal of the twenty-third resistor R23 and the first terminal of the fourteenth capacitor C14 are both connected to the target power supply. The second terminal of the fourteenth capacitor C14 is grounded. The emitter of NPN transistor Q3 is connected to the first terminal of the fifteenth capacitor C15 and the emitter of PNP transistor Q4, respectively. The collector of PNP transistor Q4 is grounded. The second terminal of the fifteenth capacitor C15 is connected to the first terminal of the twenty-second resistor R22. The second terminal of the twenty-second resistor R22 is connected to the first terminal of the primary winding of the first transformer T1.

[0088] In this embodiment, a structural diagram of a control circuit is provided. The control circuit includes a PWM chip IC2, a Zener diode, a resistor, a capacitor, an NPN type transistor, and a PNP type transistor.

[0089] exist Figure 3 In the circuit shown, the voltage at the output of operational amplifier U in feedback circuit 12 is fed back to the PWM chip IC2 of the control circuit through the fifteenth resistor R15. When PWM chip IC2 receives the voltage U = 1 / C fed back by operational amplifier U, 12 R 14 When ∫Vrefdt, the PWM chip IC2 will adjust the output PWM signal pulse by pulse and reduce the ripple in the voltage and current signals in the multi-stage output filter circuit 11.

[0090] The control circuit 13 can adjust the output voltage of the multi-stage output filter circuit 11 by adjusting the duty cycle of the PWM signal output by the PWM chip. At the same time, after the multi-stage output filter circuit 11 performs multi-stage filtering on the output voltage of the target power supply, it can quickly reduce the ripple of the output voltage of the target power supply U.

[0091] Please see Figure 4 , Figure 4 To Figure 3 The Bode plot shown is from a MATLAB simulation of the power supply unit used on a server motherboard. Figure 4 The upper part of the Bode plot shown represents... Figure 3 The diagram shows the amplitude-frequency response of the supply voltage when the circuit supplies power to the server motherboard during operation; the lower half of the diagram shows... Figure 3 The diagram shows the phase-frequency characteristic change of the supply voltage when the circuit supplies power to the server motherboard during operation. In practical applications, the low-frequency signal output by the target power supply is the 12V supply voltage, while the high-frequency and mid-frequency signals output by the target power supply are interference signals and high-frequency ripple, etc. Figure 4 As can be seen from the variation graphs of the amplitude-frequency response curve and the phase-frequency response curve shown, using Figure 3 The power supply device shown performs multi-stage filtering on the output voltage of the target power supply, ensuring that the voltage signal output by the target power supply maintains good performance in the low-frequency range, while rapidly attenuating in the mid-frequency and high-frequency ranges. Therefore, the power supply device provided in this application enables the multi-stage output filtering circuit to output a stable and reliable low-ripple power supply voltage.

[0092] It is conceivable that when a multi-stage output filtering circuit can output a stable and reliable low-ripple power supply voltage to the server motherboard, the motherboard can simply step down the voltage to power its CPU, GPU, and other components. This eliminates the need for adding complex filtering circuits to the motherboard, thus significantly reducing the space occupied by the server motherboard. Furthermore, in the power supply device provided in this application, since the multi-stage output filtering circuit is constructed from resistors, capacitors, inductors, and voltage regulators with lower design costs, the design cost of the server motherboard power supply can be significantly reduced.

[0093] In summary, the power supply device for server motherboards provided in this application can not only reduce the design cost of the server motherboard power supply, but also reduce the space occupied by the server motherboard.

[0094] Accordingly, the present invention also discloses a server, including a power supply device for a server motherboard as disclosed above.

[0095] The server provided in this embodiment of the invention has the beneficial effects of the power supply device for a server motherboard disclosed above.

[0096] The various embodiments described in this specification are presented in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. Finally, it should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0097] The above provides a detailed description of a power supply device for a server motherboard and a server provided by the present invention. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A power supply device for use on a server motherboard, characterized in that, include: The multi-stage output filter circuit, constructed from resistors, capacitors, inductors, and voltage regulators, is used to supply power to the server motherboard. Based on the principle of reducing the ripple of the target power supply's output voltage, it performs multi-stage filtering on the target power supply's output voltage to obtain a filtered voltage. A feedback circuit, connected to the multi-stage output filter circuit, is used to transmit the filtered voltage to the control circuit; The control circuit is connected to the feedback circuit and uses a PWM wave to regulate the filter voltage so that the ripple of the filter voltage meets a preset condition. Also includes: An energy transfer circuit, connected to the multi-stage output filter circuit and the control circuit, is used to transfer the output voltage of the target power supply to the multi-stage output filter circuit. The energy transfer circuit includes: a first transformer, a second transformer, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first NMOS transistor, and a second NMOS transistor; In this configuration, the first terminal of the secondary winding of the first transformer is connected to the first terminal of the first resistor; the second terminal of the first resistor is connected to the gate of the first NMOS transistor; the source of the first NMOS transistor is connected to the second terminal of the secondary winding of the first transformer; the drain of the first NMOS transistor is connected to the second terminal of the primary winding of the second transformer; the first terminal of the primary winding of the second transformer is connected to the first terminal of the first capacitor; the second terminal of the first capacitor is grounded; the first terminal of the first capacitor is connected to the target power supply; and the first terminal of the first winding of the secondary side of the second transformer is connected to the first terminal of the second resistor, the first terminal of the second winding of the secondary side of the second transformer, and the first... The first terminal of the three resistors is connected to the drain of the second NMOS transistor. The second terminal of the first winding of the second secondary side of the transformer is grounded. The second terminal of the second resistor is connected to the first terminal of the second capacitor. The second terminal of the second capacitor is connected to the source of the second NMOS transistor and the first terminal of the fourth capacitor. The second terminal of the fourth capacitor is connected to the first terminal of the fifth resistor. The second terminal of the fifth resistor is grounded. The second terminal of the second winding of the second secondary side of the transformer is connected to the first terminal of the third capacitor. The second terminal of the third capacitor is connected to the first terminal of the fourth resistor. The second terminal of the fourth resistor is connected to the second terminal of the third resistor and the gate of the second NMOS transistor. The multi-stage output filter circuit includes: a first inductor, a second inductor, a first Zener diode, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a sixth resistor, a seventh resistor, an eighth resistor, and a sampling circuit for sampling the voltage value of the first inductor. Wherein, the second terminal of the sixth resistor is connected to the negative terminal of the first Zener diode, the first terminal of the sixth capacitor, and the first terminal of the first inductor, respectively; the positive terminal of the first Zener diode is connected to the first terminal of the fifth capacitor; the second terminal of the first inductor is connected to the first terminal of the second inductor and the first terminal of the seventh capacitor, respectively; the second terminal of the second inductor is connected to the first terminal of the seventh resistor and the first terminal of the eighth capacitor, respectively; the second terminal of the seventh resistor is connected to the first terminal of the eighth resistor; and the second terminals of the fifth capacitor, the sixth capacitor, the seventh capacitor, the eighth resistor, and the eighth capacitor are all grounded. Correspondingly, the first end of the sixth resistor is connected to the source of the second NMOS transistor, and the second end of the second inductor is used to output the voltage that supplies power to the server motherboard.

2. The power supply device according to claim 1, characterized in that, The sampling circuit includes: a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a ninth capacitor, a tenth capacitor, and a voltage regulator chip; Wherein, the first end of the ninth resistor is connected to the first end of the first inductor, the second end of the ninth resistor is connected to the first end of the tenth resistor, the second end of the tenth resistor is connected to the first end of the ninth capacitor, the first end of the twelfth resistor and the third end of the voltage regulator chip, the second end of the first inductor is connected to the first end of the eleventh resistor, the second end of the eleventh resistor is connected to the second end of the ninth capacitor, the first end of the tenth capacitor, the first end of the thirteenth resistor and the first end of the voltage regulator chip, the second end of the tenth capacitor is connected to the second end of the twelfth resistor, and the second ends of the tenth resistor, the voltage regulator chip and the thirteenth resistor are all grounded.

3. The power supply device according to claim 1, characterized in that, The second inductor is specifically a rod-shaped inductor.

4. The power supply device according to claim 1, characterized in that, The feedback circuit includes: a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eleventh capacitor, a twelfth capacitor, and an operational amplifier; Wherein, the second end of the fifteenth resistor is connected to the output end of the operational amplifier and the first end of the twelfth capacitor, the positive input end of the operational amplifier is connected to the first end of the eleventh capacitor and the first end of the sixteenth resistor, the negative input end of the operational amplifier is connected to the first end of the seventeenth resistor, the second end of the eleventh capacitor and the first end of the fourteenth resistor, the second end of the sixteenth resistor is used to receive the reference voltage, the second end of the fourteenth resistor is connected to the first end of the twelfth capacitor, and the second end of the twelfth capacitor is connected to the second end of the fifteenth resistor; Accordingly, the first end of the fifteenth resistor is the output end of the feedback circuit, and the second end of the seventeenth resistor is used to receive the sampling voltage of the sampling circuit.

5. The power supply device according to claim 4, characterized in that, The expression for the output voltage of the operational amplifier is: ； In the formula, The output voltage of the operational amplifier is... Let be the capacitance value of the twelfth capacitor. The resistance value of the fourteenth resistor. For time, The reference voltage is denoted as .

6. The power supply device according to claim 4, characterized in that, The control circuit includes: a PWM chip, a second Zener diode, an NPN transistor, a PNP transistor, a thirteenth capacitor, a fourteenth capacitor, a fifteenth capacitor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, and a twenty-third resistor; In this configuration, the FB terminal of the PWM chip is connected to the negative terminal of the second Zener diode, the first terminal of the thirteenth capacitor, and the first terminal of the fifteenth resistor, respectively. The IS terminal of the PWM chip is connected to the first terminal of the twentieth resistor. The second terminal of the twentieth resistor, the second terminal of the thirteenth capacitor, and the positive terminal of the second Zener diode are all grounded. The OB terminal of the PWM chip is connected to the first terminal of the eighteenth resistor. The second terminal of the eighteenth resistor is connected to the first terminal of the nineteenth resistor. The second terminal of the nineteenth resistor is connected to VCC. The OC terminals of the PWM chip are all connected to the first terminal of the eleventh resistor. The second terminal of the eleventh resistor... The terminals are respectively connected to the base of the NPN transistor and the base of the PNP transistor. The collector of the NPN transistor is connected to the first terminal of the 23rd resistor. The second terminal of the 23rd resistor and the first terminal of the 14th capacitor are both connected to the target power supply. The second terminal of the 14th capacitor is grounded. The emitter of the NPN transistor is respectively connected to the first terminal of the 15th capacitor and the emitter of the PNP transistor. The collector of the PNP transistor is grounded. The second terminal of the 15th capacitor is connected to the first terminal of the 22nd resistor. The second terminal of the 22nd resistor is connected to the first terminal of the primary winding of the first transformer.

7. A server, characterized in that, Includes a power supply device for use on a server motherboard as described in any one of claims 1 to 6.

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