Circuit board and server

Abstract

The invention provides a circuit board and a server, and relates to the technical field of electronic equipment.The circuit board comprises a substrate, a converter and an inductor, the substrate is provided with a first surface and a second surface, and the area of the substrate is smaller than or equal to a preset threshold value. The converter is arranged on the first surface of the substrate, the inductor is arranged on the second surface of the substrate, and the converter is connected with the inductor; the converter is used for processing the received first current signal to obtain a second current signal and sending the second current signal to the inductor, and the current of the second current signal is smaller than that of the first current signal. According to the circuit board provided by the invention, under the condition that the space is limited, the converter and the inductor are arranged on different surfaces of the circuit board substrate; the utilization rate of the circuit board can be improved, the area of the circuit board is reduced, signal interference among components is reduced, and the signal transmission efficiency is improved.

Description

Technical Field

[0001] The present application relates to the field of electronic equipment, and in particular to a circuit board and a server. Background Art

[0002] With the development of information technology, servers have gradually become an important carrier for building smart cities and smart life due to their powerful data processing capabilities. As a result, all walks of life have higher and higher requirements for server computing power, capacity, volume, space utilization and other aspects.

[0003] The circuit boards (PCB) in existing servers have certain spatial layout problems, which lead to serious signal interference between components and devices, thus affecting the data processing capability of the server to a certain extent.

[0004] Based on this, how to design the positions of various components on the circuit board in the server and improve the utilization rate of the circuit board in the server has become an urgent problem to be solved. Summary of the invention

[0005] The present application provides a circuit board and a server, which are used to solve the technical problem that the space utilization rate of the circuit board in the server is low, resulting in large signal interference.

[0006] In a first aspect, the present application provides a circuit board, comprising a substrate, a converter and an inductor, wherein:

[0007] The substrate has a first surface and a second surface, and an area of ​​the substrate is less than or equal to a preset threshold;

[0008] The converter is arranged on the first surface of the substrate, the inductor is arranged on the second surface of the substrate, and the converter is connected to the inductor;

[0009] The converter is used to process the received first current signal to obtain a second current signal, and send the second current signal to the inductor, wherein the current of the second current signal is smaller than the current of the first current signal.

[0010] By placing the converter and the inductor on different surfaces of the substrate, the structure is simple and reliable, which improves the flexibility of the layout of components on the circuit board. It can also reduce the signal interference of the inductor signal on the converter, reduce the area of ​​the substrate, and thus reduce the cost of the circuit board.

[0011] Optionally, a first through hole is provided on the circuit board, and the converter includes a first switch pin, and the first switch pin passes through the first through hole and is connected to one end of the inductor.

[0012] The first switch pin of the converter is passed through the first through hole and connected to one end of the inductor disposed on the second surface. The SW signal can be transmitted to the inductor through the first switch pin and the first through hole.

[0013] Optionally, the circuit board further includes a first feedback resistor, a second feedback resistor, a second through hole and a third through hole, and the first feedback resistor and the second feedback resistor are both on the second surface of the substrate;

[0014] One end of the first feedback resistor is connected to the inductor, and the other end of the first feedback resistor is passed through the second through hole and connected to the converter;

[0015] One end of the second feedback resistor is connected to the inductor, and the other end of the second feedback resistor is passed through the second through hole and connected to one end of the converter;

[0016] The first feedback resistor and the second feedback resistor are used to process the received first voltage signal to obtain a second voltage signal, and send the second voltage signal to the inductor, wherein the voltage of the second voltage signal is less than the voltage of the first voltage signal, or the voltage of the second voltage signal is greater than the voltage of the first voltage signal.

[0017] The first voltage signal received from the converter is processed by the first feedback resistor R1 and the second feedback resistor R2 to obtain a second voltage signal, and the second voltage signal is sent to the inductor.

[0018] Optionally, the circuit board further includes a thermistor, an input capacitor, a feedforward capacitor, a bootstrap capacitor, a third through hole and a fourth through hole; the thermistor, the input capacitor, the feedforward capacitor and the bootstrap capacitor are all arranged on the first surface of the substrate;

[0019] The positive end of the input capacitor is connected to the converter, and the negative end of the input capacitor is connected to the power ground;

[0020] The positive end of the bootstrap capacitor is connected to the converter, and the positive end of the bootstrap capacitor is passed through the third through hole and connected to the inductor;

[0021] The negative end of the feedforward capacitor is connected to the converter, the negative end of the feedforward capacitor is also passed through the second through hole and connected to the other end of the first feedback resistor, and the positive end of the feedforward capacitor is connected to the negative end of the output capacitor;

[0022] One end of the thermistor is connected to the converter, and the other end of the thermistor is passed through the fourth through hole and connected to the inductor.

[0023] By designing a plurality of through holes to realize the connection between the components on the first surface and the components on the second surface, the signal interference of the parasitic inductance can be reduced.

[0024] Optionally, the circuit board further includes a first remote resistor, a second remote resistor and a fifth through hole;

[0025] One end of the first remote resistor is connected to the inductor, and the other end of the first remote resistor is passed through the second through hole and connected to the converter;

[0026] One end of the second remote resistor is connected to the inductor, and the other end of the second remote resistor is passed through the fifth through hole and connected to the converter.

[0027] Optionally, the circuit board further includes a buffer resistor, a buffer capacitor and a sixth through hole;

[0028] The buffer resistor and the buffer capacitor are both arranged on the second surface of the substrate, one end of the buffer resistor is connected to the inductor, and the other end of the buffer resistor is passed through the sixth through hole and connected to the converter;

[0029] The negative end of the buffer capacitor is connected to the inductor, and the positive end of the buffer capacitor is passed through the sixth through hole and connected to the converter;

[0030] The buffer resistor and the buffer capacitor are used to filter out peak voltage.

[0031] Optionally, the circuit board further includes at least two output capacitors and a seventh through hole, and the at least two output capacitors are arranged on the second surface of the substrate;

[0032] The at least two output capacitors include an output filter capacitor and at least one first capacitor;

[0033] The positive terminal of the first capacitor is connected to the inductor, and the negative terminal of the first capacitor is connected to the power ground;

[0034] The negative end of the output filter capacitor is connected to the inductor, and the positive end of the output filter capacitor is passed through the seventh through hole and connected to the converter.

[0035] The output capacitors are all arranged on the second surface of the substrate, adjacent to the inductor, so as to reduce noise interference and electromagnetic radiation on the loop.

[0036] Optionally, the circuit board further includes an analog signal ground, a resistor divider circuit and an eighth through hole;

[0037] The analog signal ground and the resistor divider circuit are both arranged on the second surface of the substrate;

[0038] One end of the resistor divider circuit is connected to the other end of the inductor, the other end of the resistor divider circuit is passed through the eighth through hole and connected to the power ground, and the analog signal ground is passed through the eighth through hole and connected to the other end of the second feedback resistor.

[0039] The analog signal ground and the resistor divider circuit are connected to the isolated power ground on the first side through the through hole on the substrate, which can reduce loss and shield noise.

[0040] Optionally, the circuit board further includes a load resistor and a ninth through hole, and the load resistor is arranged on the first surface of the substrate;

[0041] One end of the load resistor is connected to the converter, and the other end of the load resistor is passed through the ninth through hole and connected to the inductor.

[0042] The load resistor is arranged on the first surface of the substrate, so that the voltage is further processed according to the load resistor by the converter, the magnitude of the voltage is adjusted, and the voltage is sent to the inductor.

[0043] In a second aspect, the present application provides a server, comprising a processor, a memory communicatively connected to the processor, and the circuit board as described in the first aspect.

[0044] The present application provides a circuit board and a server, wherein the area of ​​the substrate is less than or equal to a preset threshold. The converter is arranged on the first surface of the substrate, the inductor is arranged on the second surface of the substrate, and the converter and the inductor are connected; the converter is used to process the received first current signal to obtain a second current signal, and send the second current signal to the inductor, the current of the second current signal is less than the current of the first current signal, so that when the space of the circuit board is limited, the converter and the inductor are arranged on different surfaces of the circuit board substrate, which can improve the utilization rate of the circuit board while reducing the area of ​​the circuit board and the signal interference between components, thereby improving the signal transmission efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0046] Figure 1 It is a structural schematic diagram of a step-down circuit in the prior art;

[0047] Figure 2 A schematic diagram of the structure of a substrate in a circuit board provided in an embodiment of the present application;

[0048] Figure 3 It is a structural schematic diagram of a circuit board in the prior art;

[0049] Figure 4 A schematic diagram of the layout of the second surface of a substrate in a circuit board provided in an embodiment of the present application;

[0050] Figure 5 A schematic diagram of the layout of a first surface of a substrate in a circuit board provided in an embodiment of the present application;

[0051] Figure 6 A schematic diagram of the layout of the second surface of a substrate in a circuit board provided in an embodiment of the present application;

[0052] Figure 7 A schematic diagram of the structure of a server provided in an embodiment of the present application.

[0053] Description of reference numerals:

[0054] R1: first feedback resistor; R2: second feedback resistor; R3: thermistor;

[0055] R4: first remote resistor; R5: second remote resistor; R6: buffer resistor;

[0056] C1: input capacitor; C2: buffer capacitor; C3: output filter capacitor; C4: first capacitor;

[0057] CFF: feedforward capacitor; CSS: bootstrap capacitor; GND: analog signal ground; L: inductor; IC: converter.

[0058] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0059] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0060] Terminology explanation:

[0061] The buck circuit (BUCK) refers to a DC-DC (direct current-direct current) buck converter, which includes at least one power switch tube, an inductor, a load resistor and at least two capacitors.

[0062] The buck circuit can reduce the received voltage by controlling the periodic switching of an inductor and a power switch tube, thereby completing the conversion process from high voltage to low voltage.

[0063] The power switch tube (MOSFET), also known as the field effect tube, is used to charge energy (voltage X current) from the input end to components such as loads and inductors when it is in the on state.

[0064] Inductance (L): The inductance in the server can be used to shield signals, filter noise, stabilize current, suppress electromagnetic interference, etc.

[0065] With the development of information technology, servers have gradually become an important carrier for building smart cities and smart life due to their powerful data processing capabilities. As a result, all walks of life have higher and higher requirements for server computing power, capacity, volume, space utilization, etc. The step-down circuit in the server can provide a stable power supply for the server to ensure the stable operation of the server.

[0066] Figure 1 It is a structural schematic diagram of a step-down circuit in the prior art.

[0067] See also Figure 1 The step-down circuit includes two power switch tubes (specifically, power switch tube 1 and power switch tube 2), an inductor (L), a load resistor RLoad and two capacitors (specifically, an input capacitor and an output capacitor).

[0068] The positive end of the input capacitor is connected to one end of the power switch tube 1 , and the other end of the power switch tube 1 is connected to one end of the inductor L1 through a switch (Switch, SW) pin at one end of the power switch tube 2 .

[0069] The other end of the inductor L1 is connected to the positive end of the output capacitor and one end of the load circuit RLoad.

[0070] The other end of the load circuit RLoad is connected to the negative end of the output capacitor, and the negative end of the output capacitor is grounded.

[0071] The other end of the power switch tube 2 is connected to the negative end of the output capacitor and the negative end of the input capacitor respectively.

[0072] When the buck circuit is in the on state, the power switches 1 and 2 are in the on state, the current passes through the inductor L and the load resistor RLoad, the inductor L stores energy (voltage × current) and supplies power to the load resistor RLoad, at this time, the output voltage is within a stable range.

[0073] When the buck circuit is disconnected, the power switches 1 and 2 are in the off state, and the inductor L releases the stored energy to keep the output voltage within a stable range. Based on this, the buck circuit can adjust the output voltage by adjusting the on time and off time of the power switch tube.

[0074] Furthermore, the buck circuit can also adjust the output voltage through an external feedback circuit, for example, by adjusting the parameters of components in the external feedback circuit.

[0075] Based on this, the buck circuit, as a step-down switching power supply circuit, is very important in the position on the circuit board inside the server.

[0076] However, existing circuit boards in servers usually have signal interference problems. For example, the noise of the input voltage and output voltage of each capacitor interferes with other components, or the noise of the SW signal of the inductor interferes with other components. The interference source will be centered on the inductor and radiate the entire PCB space from strong to weak. Severe interference sources may even affect the normal operation of the central processing unit (CPU), graphics processing unit (GPU), complex programmable logic device (CPLD), baseboard management controller (BMC), open computing project accelerator module (OAM), and integrated circuit bus (I2C) in the server, thereby affecting the data processing capability of the server.

[0077] In view of the above technical problems, the embodiments of the present application provide a circuit board and a server. In which, when the area of ​​the circuit board is less than or equal to a preset threshold, the converter and the inductor are arranged on different surfaces of the circuit board substrate, which can improve the utilization rate of the circuit board while reducing the area of ​​the circuit board and the signal interference between components, thereby improving the data processing capability of the server.

[0078] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0079] The circuit board provided in the embodiment of the present application includes a substrate, a converter and an inductor, wherein the substrate has a first surface and a second surface, and the area of ​​the substrate is less than or equal to a preset threshold;

[0080] Specifically, the substrate has a first surface and a second surface, and the areas of the first surface and the second surface are the same. In this way, the area of ​​the substrate = the area of ​​the first surface = the area of ​​the second surface. If the area of ​​the substrate is less than or equal to the preset threshold, it is determined that the circuit board space is limited, indicating that the area of ​​the substrate is smaller than the space occupied by each component in the circuit board under the condition of no signal interference. The preset threshold can be specifically set according to the size of the space occupied by each component on the circuit board under the condition of no signal interference.

[0081] The converter is arranged on the first surface of the substrate, the inductor is arranged on the second surface of the substrate, and the converter is connected to the inductor;

[0082] The converter is used to process the received first current signal to obtain a second current signal, and send the second current signal to the inductor, wherein the current of the second current signal is smaller than the current of the first current signal.

[0083] Specifically, the area of ​​the substrate is less than or equal to a preset threshold, the converter is arranged on the first surface of the substrate, the inductor is arranged on the second surface of the substrate, and the converter and the inductor are connected to reduce the area occupied by the converter and the inductor in the substrate and improve the utilization rate of the area in the substrate. The converter can also be called a conversion chip.

[0084] Optionally, when the area of ​​the substrate is smaller than the second area, it is determined that the space of the circuit board is limited, the sum of the areas of the general inductor and other components is larger than the area of ​​the substrate, and the inductor is set to be a customized shielded inductor, and the area of ​​the customized shielded inductor is smaller than the area of ​​the general inductor. The second area can be set according to the area size of the general inductor.

[0085] Specifically, the converter can charge the inductor when its power switch tube is in the on state, that is, the converter is used to process the received first current signal to obtain a second current signal, and send the second current signal to the inductor. The current of the second current signal is less than the current of the first current signal to provide current to the inductor so that the inductor has sufficient power to work normally.

[0086] It can be understood that the converter generally includes two power switching tubes (MOSFET), wherein the first power switching tube (also referred to as the upper MOS) receives energy (voltage X current) from the input end in the on state, charges the load resistor, and charges the output capacitor and inductor.

[0087] When the energy of the inductor is sufficient (it can also be called that the output capacitor connected to the inductor and closest to the inductor has sufficient power to support the action of the inductor), the second power switch tube (also called the lower MOS) is turned on. When the voltage is lower than the first threshold, it means that the voltage flowing through the components on the circuit board is too low, the second power switch tube (also the lower MOS) is turned off, and the first power switch tube (also the upper MOS) is turned on to continue charging the load resistance, output capacitor, and inductor.

[0088] Optionally, the inductor disposed on the second surface may also rotate clockwise to reduce the loop area, reduce electromagnetic interference (EMI), and improve signal processing efficiency.

[0089] Figure 2 A schematic diagram of the structure of a substrate in a circuit board provided in an embodiment of the present application.

[0090] See also Figure 2 The substrate in the circuit board is a non-conductive rectangular plate with a certain thickness. The plane formed by the dotted line indicates the first surface of the substrate in the circuit board, and the plane formed by the solid line with an arrow indicates the second surface of the substrate in the circuit board.

[0091] according to Figure 2 It can be seen that when the substrate area is fixed, if the components are closely arranged on the substrate surface, the noise of some components will interfere with other signals. When the distance between components on the substrate is large to avoid signal interference, the substrate area will be too large.

[0092] Figure 3 It is a schematic diagram of the structure of a circuit board in the prior art.

[0093] See also Figure 3In the prior art, the converter, inductor and other components on the circuit board are all arranged on the same surface of the substrate. A plurality of through holes are arranged on the substrate, and one end of the first remote resistor, the second remote resistor, the thermistor, the first feedback resistor and the second feedback resistor on the circuit board are all connected to the converter, and the first remote resistor and the second remote resistor bypass the substrate surface and are connected to the inductor on the other side of the substrate surface. The other end of the thermistor is passed through the through hole 1 on the substrate and connected to the inductor, the other end of the first feedback resistor is passed through the through hole 2 on the substrate and connected to the inductor, and the other end of the second feedback resistor is passed through the through hole 3 on the substrate and connected to the inductor. The switch SW pin of the converter is connected to one end of the inductor, and the other end of the inductor is connected to the positive end of the output capacitor. The other end of the first feedback resistor of the converter pin is also connected to the negative end of the feedforward CFF capacitor, and the negative end of the output capacitor is connected to the positive end of the feedforward capacitor. The pin of the converter is connected to the positive end of the input capacitor, and the negative end of the input capacitor is passed through the through hole 4 in the substrate and connected to the power ground. The pin pin of the converter is also connected to the positive end of a bootstrap capacitor (CSS, or BST), and the negative end of the bootstrap capacitor passes through a through hole 5 in the substrate and is connected to the inductor.

[0094] The inductor is arranged on the side of the input capacitor Cin and the output capacitor Cout to prevent the SW signal noise of the inductor from interfering with the converter U1. At the same time, the distance between the output signal of the inductor and the feedback resistor is relatively close, shortening the path of the feedback signal.

[0095] In addition, the bootstrap capacitor CSS is arranged at the side of the converter U1, so that the signal interference of the converter U1 is small, and the stability of the converter U1 is improved.

[0096] However, since the input capacitor, the output capacitor and the converter U1 are arranged close to each other, the noise of the input voltage Vin and the output voltage Vout after passing through the filter chip in the capacitor is relatively large, which may cause signal interference to the converter U1.

[0097] That is to say, when the space of the substrate is limited, the components are closely arranged, which may cause signal interference. Setting up the layout of each component separately to avoid signal interference will result in a larger substrate area and increase the cost of the circuit board.

[0098] The embodiment of the present application arranges the converter and the inductor on different surfaces of the substrate, so that the structure is simple and reliable, and the flexibility of the layout of components on the circuit board is improved. It can also reduce the signal interference of the inductor signal on the converter, reduce the area of ​​the substrate, and thus reduce the cost of the circuit board. In addition, on the basis of reducing the signal interference in the circuit board, it can also improve the data processing capacity of the server.

[0099] In some embodiments, a first through hole is provided on the circuit board, and the converter includes a first switch pin, and the first switch pin passes through the first through hole and is connected to one end of the inductor.

[0100] Specifically, a first through hole is provided on the circuit board, and the converter includes a first switch SW pin, and the first switch pin of the converter is passed through the first through hole and connected to one end of the inductor provided on the second surface. Based on this, the SW signal can be transmitted to the inductor through the first switch pin and the first through hole.

[0101] Optionally, the noise of the SW switch connection node of the inductor is relatively large, and the area of ​​the SW switch connection node should be reduced and set at a position far away from other sensitive components that are susceptible to noise interference, such as a ferrite bead (FB).

[0102] In some embodiments, the circuit board further includes a first feedback resistor, a second feedback resistor, a second through hole, and a third through hole, and the first feedback resistor and the second feedback resistor are both disposed on the second surface of the substrate;

[0103] One end of the first feedback resistor is connected to the inductor, and the other end of the first feedback resistor is passed through the second through hole and connected to the converter;

[0104] One end of the second feedback resistor is connected to the inductor, and the other end of the second feedback resistor is passed through the second through hole and connected to one end of the converter;

[0105] The first feedback resistor and the second feedback resistor are used to process the received first voltage signal to obtain a second voltage signal, and send the second voltage signal to the inductor, wherein the voltage of the second voltage signal is less than the voltage of the first voltage signal, or the voltage of the second voltage signal is greater than the voltage of the first voltage signal.

[0106] Specifically, the circuit board further includes a first feedback resistor R1, a second feedback resistor R2, a second through hole and a third through hole. The first feedback resistor and the second feedback resistor are both arranged on the second surface of the substrate, adjacent to the inductor.

[0107] Specifically, one end of the first feedback resistor R1 is connected to the inductor, and one end of the second feedback resistor R2 is connected to the inductor. The other end of the first feedback resistor R1 and the other end of the second feedback resistor R2 are both inserted into the second through hole and connected to the converter disposed on the first surface. The above feedback resistors are used to adjust the voltage.

[0108] In this way, the first feedback resistor R1 and the second feedback resistor R2 are used to process the first voltage signal received from the converter to obtain a second voltage signal, and send the second voltage signal to the inductor. The above processing method includes step-down processing or step-up processing, and correspondingly, the voltage of the second voltage signal is less than the voltage of the first voltage signal, or the voltage of the second voltage signal is greater than the voltage of the first voltage signal.

[0109] In some embodiments, the circuit board further includes a thermistor, an input capacitor, a feedforward capacitor, a bootstrap capacitor, a third through hole, and a fourth through hole; the thermistor, the input capacitor, the feedforward capacitor, and the bootstrap capacitor are all disposed on the first surface of the substrate;

[0110] The positive end of the input capacitor is connected to the converter, and the negative end of the input capacitor is connected to the power ground;

[0111] The positive end of the bootstrap capacitor is connected to the converter, and the positive end of the bootstrap capacitor is passed through the third through hole and connected to the inductor;

[0112] The negative end of the feedforward capacitor is connected to the converter, the negative end of the feedforward capacitor is also passed through the second through hole and connected to the other end of the first feedback resistor, and the positive end of the feedforward capacitor is connected to the negative end of the output capacitor;

[0113] One end of the thermistor is connected to the converter, and the other end of the thermistor is passed through the fourth through hole and connected to the inductor.

[0114] Specifically, the circuit board also includes a thermistor R3, an input capacitor C1, a feedforward capacitor CFF, a bootstrap capacitor CSS, a third through hole, and a fourth through hole. The input voltage and output voltage in the above capacitors have little interference on the signal of the converter. Based on this, the thermistor R3, the input capacitor C1, the feedforward capacitor CFF, and the bootstrap capacitor CSS are all arranged on the first surface of the substrate, adjacent to the converter arranged on the first surface.

[0115] Specifically, the positive end of the input capacitor C1 is connected to the converter, and the negative end of the input capacitor C1 is connected to the power ground. The positive end of the bootstrap capacitor CSS is connected to the converter, and the positive end of the bootstrap capacitor CSS is passed through the third through hole and connected to the inductor disposed on the second surface. The negative end of the feedforward capacitor CFF is connected to the converter, and the negative end of the feedforward capacitor CFF is also passed through the second through hole and connected to the other end of the first feedback resistor R1 disposed on the second surface, and the positive end of the feedforward capacitor CFF is connected to the negative end of the output capacitor.

[0116] Specifically, one end of the thermistor R3 is connected to the converter, and the other end of the thermistor R3 is passed through the fourth through hole and connected to the inductor.

[0117] Optionally, the converter further includes a freewheeling diode, which should be as close to the inside of the converter as possible to reduce the signal interference of parasitic inductance thereon. The input capacitor also includes an input filter capacitor and a bypass capacitor (Cbypass), and the wiring of the input filter capacitor and the bypass capacitor (Cbypass) is set to be shorter, for example, the wiring of the input filter capacitor and the bypass capacitor (Cbypass) is 1MM.

[0118] Optionally, the distance between the input capacitor and the ground wire of the input capacitor should be greater than a preset ground wire distance, for example, the preset ground wire distance is 1 cm, or the preset ground wire distance is twice, to reduce signal interference of high-frequency noise of the voltage passing through the capacitor.

[0119] Optionally, a custom shielded inductor can be co-located with the converter on a different surface of the substrate.

[0120] Optionally, a copper wire may be laid under the inductor so that eddy currents in the ground layer do not reduce the inductance.

[0121] Optionally, the wiring between the components on the first surface of the substrate should avoid being located under the inductor to reduce the loop area and reduce electromagnetic interference.

[0122] Optionally, the wiring can be routed at a 45-degree angle or an arc angle, and the power loop can be set shorter and the wiring thicker to reduce signal reflection and distortion.

[0123] Optionally, the bootstrap capacitor may be arranged near the inductor, using a routing path with a width greater than a preset width threshold, for example, the preset width threshold is 20 mil or 25 mil.

[0124] Optionally, the circuit board further includes a power capacitor, which is disposed on the first surface of the substrate and is located on the same surface as the converter.

[0125] Exemplarily, the power capacitor is adjacent to the power supply VCC pin of the converter.

[0126] In the embodiment of the present application, a plurality of through holes are designed to realize the connection between the components on the first surface and the components on the second surface, thereby reducing the signal interference caused by parasitic inductance.

[0127] Furthermore, by providing copper wires to connect various components, parasitic inductance impedance can be reduced, thereby improving the performance and stability of the circuit on the circuit board.

[0128] In some embodiments, the circuit board further includes a first remote resistor, a second remote resistor, and a fifth through hole;

[0129] One end of the first remote resistor is connected to the inductor, and the other end of the first remote resistor is passed through the second through hole and connected to the converter;

[0130] One end of the second remote resistor is connected to the inductor, and the other end of the second remote resistor is passed through the fifth through hole and connected to the converter.

[0131] Specifically, the circuit board further includes a first remote resistor R4, a second remote resistor R5 and a fifth through hole, and the first remote resistor R4 and the second remote resistor R5 are adjacent to the inductor arranged on the same surface. One end of the first remote resistor R4 is connected to the inductor, one end of the second remote resistor R5 is connected to the inductor, and the other end of the first remote resistor R4 and the other end of the second remote resistor R5 are both passed through the fifth through hole and connected to the converter.

[0132] In some embodiments, the circuit board further includes a buffer resistor, a buffer capacitor, and a sixth through hole;

[0133] The buffer resistor and the buffer capacitor are both arranged on the second surface of the substrate, one end of the buffer resistor is connected to the inductor, and the other end of the buffer resistor is passed through the sixth through hole and connected to the converter;

[0134] The negative end of the buffer capacitor is connected to the inductor, and the positive end of the buffer capacitor is passed through the sixth through hole and connected to the converter;

[0135] The buffer resistor and the buffer capacitor are used to filter out peak voltage.

[0136] Specifically, the circuit board further includes a buffer resistor R6, a buffer capacitor C2 and a sixth through hole, wherein the buffer resistor R6 and the buffer capacitor C2 can be used to filter out the peak voltage, thereby buffering the noise of the switch SW signal. Based on this, the buffer resistor R6 and the buffer capacitor C2 are both arranged on the second surface of the substrate, adjacent to the inductor arranged on the same surface.

[0137] Specifically, one end of the buffer resistor R6 is connected to the inductor, the negative end of the buffer capacitor C2 is connected to the inductor, the other end of the buffer resistor R6 and the positive end of the buffer capacitor C2 are both passed through the sixth through hole and connected to the converter disposed on the first surface.

[0138] In some embodiments, the circuit board further includes at least two output capacitors and a seventh through hole, and the at least two output capacitors are disposed on the second surface of the substrate;

[0139] The at least two output capacitors include an output filter capacitor and at least one first capacitor;

[0140] The positive terminal of the first capacitor is connected to the inductor, and the negative terminal of the first capacitor is connected to the power ground;

[0141] The negative end of the output filter capacitor is connected to the inductor, and the positive end of the output filter capacitor is passed through the seventh through hole and connected to the converter.

[0142] Specifically, the circuit board also includes at least two output capacitors and a seventh through hole. The noise of the voltage in the output capacitor has a greater impact on the signal interference of the converter. Based on this, the above two output capacitors are both arranged on the second surface of the substrate, adjacent to the inductor, to reduce noise interference and electromagnetic radiation in the loop.

[0143] Specifically, the at least two input capacitors include an output filter capacitor C3 and at least one first capacitor C4, wherein the output filter capacitor stores a large amount of electricity to charge the inductor.

[0144] Specifically, the positive end of the first capacitor C4 is connected to the inductor, and the negative end of the first capacitor C4 is connected to the power ground. The negative end of the output filter capacitor C3 is connected to the inductor, and the positive end of the output filter capacitor C3 is inserted into the seventh through hole and connected to the converter.

[0145] In some embodiments, the circuit board further includes an analog signal ground, a resistor divider circuit, and an eighth through hole;

[0146] The analog signal ground and the resistor divider circuit are both arranged on the second surface of the substrate;

[0147] One end of the resistor divider circuit is connected to the other end of the inductor, the other end of the resistor divider circuit is passed through the eighth through hole and connected to the power ground, and the analog signal ground is passed through the eighth through hole and connected to the other end of the second feedback resistor.

[0148] Specifically, the circuit board also includes an analog signal ground GND, a resistor divider circuit and an eighth through hole. The resistor divider circuit can be used to adjust the voltage, specifically to process the received third voltage to obtain a fourth voltage, and send the fourth voltage to the inductor, wherein the fourth voltage is less than the third voltage. The analog signal ground and the resistor divider circuit are both arranged on the second surface of the substrate, adjacent to the inductor. The resistor divider circuit is connected to the inductor, and the analog signal ground is arranged in the eighth through hole and connected to the other end of the second feedback resistor.

[0149] As an example but not a limitation, the analog signal ground is used to indicate the zero potential of the analog signal, which can be specifically an analog small signal ground. The analog small signal ground and the power ground are not adjacent or connected. The distance between the analog small signal ground and the power ground is greater than the first preset distance, and the two are connected to the isolated power ground on the first side through a through hole on the substrate to reduce loss and shield noise. Among them, the first preset distance can be specifically set according to the noise data of the analog small signal ground and the power ground.

[0150] Optionally, the resistor divider circuit may be adjacent to the parallel capacitor to improve noise resistance. At the same time, the wiring of the resistor divider circuit may be greater than a preset wiring distance from the switch node of the inductor and the switch node of the diode. For example, the preset wiring distance is 2 cm, or the preset wiring distance is 1.5 cm.

[0151] In some embodiments, the circuit board further includes a load resistor and a ninth through hole, and the load resistor is disposed on the first surface of the substrate;

[0152] One end of the load resistor is connected to the converter, and the other end of the load resistor is passed through the ninth through hole and connected to the inductor.

[0153] Specifically, the circuit board further includes a load resistor R7 and a ninth through hole, wherein the load resistor R7 is disposed on the first surface of the substrate and adjacent to the converter. The converter can further process the voltage according to the load resistor, adjust the voltage, and send it to the inductor.

[0154] Specifically, one end of the load resistor R7 is connected to the converter, and the other end of the load resistor R7 is passed through the ninth through hole and connected to the inductor.

[0155] It can be understood that the above-mentioned components disposed on the second surface and connected to the inductor can be indirectly connected to the inductor by being connected with other components (including in parallel or in parallel).

[0156] Exemplarily, one end of the buffer resistor is connected to the inductor, the other end of the buffer resistor is arranged through the sixth through hole and connected to the converter, one end of the buffer resistor is also connected to the negative end of the buffer capacitor, and the positive end of the buffer capacitor is arranged through the sixth through hole and connected to the converter. Based on this, the buffer capacitor can indirectly achieve connection with the inductor by connecting to the buffer resistor.

[0157] Figure 4 A schematic diagram of the layout of the second surface of a substrate in a circuit board proposed in an embodiment of the present application.

[0158] like Figure 4 As shown, the second surface of the substrate includes an inductor, a buffer resistor, a buffer capacitor, a first feedback resistor, a second feedback resistor, a first remote resistor, a second remote, three first capacitors (specifically, a first capacitor 1, a second capacitor 2, and a third capacitor 3) and an output filter capacitor. The positive end of the output filter capacitor is connected to the converter through the through hole 1, and the negative end of the output filter capacitor is connected to the inductor. Figure 4 In the figure, each through hole is represented by a hollow circle.

[0159] The switch pin SW of the converter is provided through the through hole 2 and connected to the inductor. One end of the buffer resistor and the positive end of the buffer capacitor are provided through the through hole 3 and connected to the converter.

[0160] The other end of the first feedback resistor is passed through the through hole 4 and connected to the converter, one end of the first feedback resistor is connected to the other end of the inductor, and one end of the first feedback resistor is also connected to one end of the second feedback resistor.

[0161] The other end of the second feedback resistor is also connected to the other end of the first remote resistor. The other end of the first remote resistor is passed through the through hole 5 and connected to the converter, thereby realizing the connection between the second feedback resistor and the converter.

[0162] One end of the second remote resistor is connected to the inductor, and the other end of the second remote resistor is passed through the through hole 6 and connected to the converter.

[0163] By connecting some components, such as connecting the first feedback resistor to the second feedback resistor, connecting the second feedback resistor to the first remote resistor, or connecting the buffer resistor to the buffer capacitor, it is possible to indirectly connect the above components to the inductor while reducing the number of through holes on the circuit board.

[0164] Figure 5 A schematic diagram of the layout of the first surface of a substrate in a circuit board provided in an embodiment of the present application.

[0165] like Figure 5 As shown, the first surface of the substrate includes an input capacitor, a feedforward capacitor, a thermistor and a bootstrap capacitor. Among them, one end of the first remote resistor and one end of the second remote resistor are both arranged in through hole 7 and connected to the inductor, one end of the first remote resistor is connected to one end of the second remote resistor, and the other end of the second remote resistor is connected to the converter. One end of the thermistor is connected to the converter, and the other end is arranged in through hole 2 and connected to the inductor.

[0166] One end of the first feedback resistor is connected to the negative end of the feedforward capacitor, one end of the second feedback resistor is connected to the other end of the first feedback resistor, and the other end of the second feedback resistor is connected to the converter. The feedforward capacitor is inserted through the through hole 9 and connected to the inductor. One end of the first feedback resistor is also inserted through the through hole 10 and connected to the negative end of the output capacitor.

[0167] The pin 1 of the converter is connected to the positive end of the input capacitor. The pin 2 of the converter is connected to the negative end of the bootstrap capacitor, and the positive end of the bootstrap capacitor is connected to the inductor through the through hole 11. The SW pin of the converter is connected to the inductor through the through hole 12. The pin 3 of the converter is connected to one end of the load resistor, and the other end of the load resistor is connected to the inductor through the through hole 13.

[0168] exist Figure 4 On the basis of Figure 6 The schematic diagram of the layout of the second surface of a substrate in another circuit board is exemplarily shown.

[0169] exist Figure 4 The second surface of the middle substrate includes an inductor, a buffer resistor, a buffer capacitor, a first feedback resistor, a second feedback resistor, a first remote resistor, a second remote resistor, three first capacitors (specifically, a first capacitor 1, a second capacitor 2, and a third capacitor 3) and an output filter capacitor. Figure 6 The second surface of the substrate in the middle circuit board also includes an analog signal ground and a resistor voltage divider circuit.

[0170] Figure 6 In the embodiment, one end of the analog signal ground is connected to the inductor, the other end of the analog signal ground is passed through the through hole 14 and connected to the converter, and the other end of the analog signal ground is also connected to the resistor divider circuit.

[0171] Figure 7 A schematic diagram of the structure of a server provided in an embodiment of the present application.

[0172] See also Figure 7 , Figure 7 This is a schematic diagram of the structure of the server provided in the embodiment of the present application. Figure 7 As shown, the server may include: a circuit board 701, a processor 702, and a memory 703. The circuit board 701 includes a substrate 7011, a converter 7012, and an inductor 7013.

[0173] The area of ​​the substrate 7011 includes a first surface and a second surface ( Figure 7 The converter 7012 is disposed on the first surface of the substrate 7011, the inductor 7013 is disposed on the second surface of the substrate 7011, and the converter 7012 is connected to the inductor 7013. The circuit board 701 can be connected to the processor 702 and the memory 703 through a system bus.

[0174] The processor 702 executes the computer execution instructions stored in the memory, so that the processor 702 executes the scheme in the above embodiment. The processor 702 can be a general-purpose processor, including a central processing unit CPU, a network processor (network processor, NP), etc.; it can also be a digital signal processor DSP, an application-specific integrated circuit ASIC, a field programmable gate array FPGA or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components.

[0175] The memory 703 is connected to the processor 702 via a system bus and completes communication between them. The memory 703 is used to store computer program instructions.

[0176] The transceiver 701 may be used to obtain a start signal, etc.

[0177] The system bus can be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus, etc. The system bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, only one thick line is used in the figure, but it does not mean that there is only one bus or one type of bus. The transceiver is used to realize the communication between the database access device and other computers (such as clients, read-write libraries, and read-only libraries). The memory may include random access memory (RAM) and may also include non-volatile memory.

[0178] The various embodiments or implementation methods in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referenced to each other.

[0179] It should be noted that the phrases "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments", etc. mentioned in the specification indicate that the described embodiments may include certain features, structures or characteristics, but not every embodiment may include the certain features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing certain features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments, whether explicitly or not explicitly described.

[0180] In general, terms should be understood, at least in part, by the context in which they are used. For example, the term "one or more" as used herein may be used to describe any feature, structure, or characteristic in a singular sense, or may be used to describe a combination of features, structures, or characteristics in a plural sense, depending, at least in part, on the context. Similarly, terms such as "a," "an," or "the" may also be understood to convey singular usage or to convey plural usage, depending, at least in part, on the context.

[0181] It should be easily understood that “on,” “above,” and “over” in the present disclosure should be interpreted in the broadest manner, so that “on” not only means “directly on something,” but also includes the meaning of “on something” with intervening features or layers therebetween, and “above” or “over” not only includes the meaning of “above” or “over,” but also may include the meaning of “above” or “over something” with no intervening features or layers therebetween (i.e., directly on something).

[0182] In addition, spatially relative terms, such as "below," "below," "beneath," "above," "above," etc., may be used herein for ease of description to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation shown in the figures. The device may have other orientations (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein may likewise be interpreted accordingly.

[0183] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A circuit board, characterized in that: It includes substrate, converter and inductor, among which, The substrate has a first surface and a second surface, and an area of ​​the substrate is less than or equal to a preset threshold; The converter is arranged on the first surface of the substrate, the inductor is arranged on the second surface of the substrate, and the converter is connected to the inductor; The converter is used to process the received first current signal to obtain a second current signal, and send the second current signal to the inductor, wherein the current of the second current signal is smaller than the current of the first current signal.

2. The circuit board according to claim 1, characterized in that: A first through hole is provided on the circuit board, and the converter includes a first switch pin, which passes through the first through hole and is connected to one end of the inductor.

3. The circuit board according to claim 1 or 2, characterized in that: The circuit board further includes a first feedback resistor, a second feedback resistor, a second through hole and a third through hole, and the first feedback resistor and the second feedback resistor are both on the second surface of the substrate; One end of the first feedback resistor is connected to the inductor, and the other end of the first feedback resistor is passed through the second through hole and connected to the converter; One end of the second feedback resistor is connected to the inductor, and the other end of the second feedback resistor is passed through the second through hole and connected to one end of the converter; The first feedback resistor and the second feedback resistor are used to process the received first voltage signal to obtain a second voltage signal, and send the second voltage signal to the inductor, wherein the voltage of the second voltage signal is less than the voltage of the first voltage signal, or the voltage of the second voltage signal is greater than the voltage of the first voltage signal.

4. The circuit board according to any one of claims 1 to 3, characterized in that: The circuit board further includes a thermistor, an input capacitor, a feedforward capacitor, a bootstrap capacitor, a third through hole and a fourth through hole; the thermistor, the input capacitor, the feedforward capacitor and the bootstrap capacitor are all arranged on the first surface of the substrate; The positive end of the input capacitor is connected to the converter, and the negative end of the input capacitor is connected to the power ground; The positive end of the bootstrap capacitor is connected to the converter, and the positive end of the bootstrap capacitor is passed through the third through hole and connected to the inductor; The negative end of the feedforward capacitor is connected to the converter, the negative end of the feedforward capacitor is also passed through the second through hole and connected to the other end of the first feedback resistor, and the positive end of the feedforward capacitor is connected to the negative end of the output capacitor; One end of the thermistor is connected to the converter, and the other end of the thermistor is passed through the fourth through hole and connected to the inductor.

5. The circuit board according to any one of claims 1 to 4, characterized in that: The circuit board also includes a first remote resistor, a second remote resistor and a fifth through hole; One end of the first remote resistor is connected to the inductor, and the other end of the first remote resistor is passed through the second through hole and connected to the converter; One end of the second remote resistor is connected to the inductor, and the other end of the second remote resistor is passed through the fifth through hole and connected to the converter.

6. The circuit board according to any one of claims 1 to 5, characterized in that: The circuit board also includes a buffer resistor, a buffer capacitor and a sixth through hole; The buffer resistor and the buffer capacitor are both arranged on the second surface of the substrate, one end of the buffer resistor is connected to the inductor, and the other end of the buffer resistor is passed through the sixth through hole and connected to the converter; The negative end of the buffer capacitor is connected to the inductor, and the positive end of the buffer capacitor is passed through the sixth through hole and connected to the converter; The buffer resistor and the buffer capacitor are used to filter out peak voltage.

7. The circuit board according to any one of claims 1 to 6, characterized in that: The circuit board further comprises at least two output capacitors and a seventh through hole, wherein the at least two output capacitors are arranged on the second surface of the substrate; The at least two output capacitors include an output filter capacitor and at least one first capacitor; The positive terminal of the first capacitor is connected to the inductor, and the negative terminal of the first capacitor is connected to the power ground; The negative end of the output filter capacitor is connected to the inductor, and the positive end of the output filter capacitor is passed through the seventh through hole and connected to the converter.

8. The circuit board according to any one of claims 1 to 7, characterized in that: The circuit board also includes an analog signal ground, a resistor divider circuit, and an eighth through hole; The analog signal ground and the resistor divider circuit are both arranged on the second surface of the substrate; One end of the resistor divider circuit is connected to the other end of the inductor, the other end of the resistor divider circuit is passed through the eighth through hole and connected to the power ground, and the analog signal ground is passed through the eighth through hole and connected to the other end of the second feedback resistor.

9. The circuit board according to any one of claims 1 to 8, characterized in that: The circuit board further comprises a load resistor and a ninth through hole, wherein the load resistor is arranged on the first surface of the substrate; One end of the load resistor is connected to the converter, and the other end of the load resistor is passed through the ninth through hole and connected to the inductor.

10. A server, characterized in that: The server comprises a processor, a memory communicatively connected to the processor, and a circuit board as claimed in any one of claims 1 to 9.

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