A driving circuit, a power supply circuit and a server

Abstract

The embodiment of the application discloses a driving circuit, a power supply circuit and a server, and relates to the technical field of power supply. The driving circuit comprises a plurality of amplification channels, and circuit structures and component parameters in the plurality of amplification channels are the same. Each amplification channel comprises a series-coupled amplification circuit and a current-limiting device, the input ends of the amplification circuits of the amplification channels are coupled, the output end of the amplification circuit is coupled with one end of the current-limiting device, and the other end of the current-limiting device of each amplification channel is coupled. Wherein, the output voltage of the driving circuit is less than or equal to 20V.

Description

Technical Field

[0001] This application relates to the field of power supply technology, and in particular to a drive circuit, a power supply circuit, and a server. Background Technology

[0002] In switching power supply circuits, to provide sufficient drive signals to the switching circuit, a multi-path parallel drive mode can be set up. Specifically, multiple amplification paths are set in the drive circuit, and the multiple paths are combined during drive output. However, when multiple amplification paths in the drive circuit are connected in parallel, due to manufacturing processes and other reasons, the device parameters in each amplification path may differ, resulting in inconsistent output times for the multiple amplification paths and affecting the reliability of the drive circuit. Summary of the Invention

[0003] This application provides a driving circuit, a power supply circuit, and a server, which can improve the reliability of the driving circuit.

[0004] The first aspect of this application provides a driving circuit including multiple amplification paths. These multiple amplification paths have identical circuit structures and component parameters. Each amplification path includes a series-coupled amplifier circuit and a current-limiting device. The input terminals of the amplifier circuit in each amplification path are coupled, the output terminals of the amplifier circuit are coupled to one end of the current-limiting device, and the other end of the current-limiting device in each amplification path is coupled. The output voltage of the driving circuit is less than or equal to 20V.

[0005] Based on this scheme, by setting multiple amplification paths in the drive circuit, each amplifies a portion of the control signal to generate multiple drive signals. The outputs of these multiple amplification paths are then combined into a single drive signal, thus increasing the current of the drive signal. Secondly, by incorporating current-limiting devices in each amplification path, when the output times of the drive signals from different amplification paths are inconsistent, the current-limiting devices can limit the reverse input drive signals to each amplification path, preventing breakdown of the amplification paths by the reverse input drive signals and improving the reliability of the drive circuit. Furthermore, by setting the multiple amplification paths to have the same circuit structure and component parameters, the drive signals output by each amplification path can have the same amplitude, allowing for better fusion of the multiple drive signals.

[0006] In conjunction with the first aspect, in one possible implementation, the aforementioned current-limiting device is a current-limiting resistor, which is less than 100Ω.

[0007] Based on this scheme, by setting current-limiting resistors in each amplification path, when the output time of the drive signals of each amplification path is inconsistent, the current-limiting resistors can limit the reverse input drive signals of each amplification path, thereby preventing each amplification path from being broken down by the reverse input drive signals and improving the reliability of the drive circuit.

[0008] In conjunction with the first aspect, in one possible implementation, the aforementioned driving circuit includes two amplification paths: a first amplification path and a second amplification path. The first and second amplification circuits have the same structure and corresponding component parameters. The first amplification path includes a first amplification circuit and a first current-limiting resistor coupled in series, and the second amplification path includes a second amplification circuit and a second current-limiting resistor coupled in series. The input terminals of the first and second amplification circuits are coupled, and the output terminal of the first amplification circuit is coupled to one end of the first current-limiting resistor. The output terminal of the second amplification circuit is coupled to one end of the second current-limiting resistor, and the other end of the first current-limiting resistor is coupled to the other end of the second current-limiting resistor.

[0009] Based on this scheme, by setting a first amplification path and a second amplification path in the driving circuit, and setting a first current-limiting resistor in the first amplification path to limit the current of the output signal of the first amplification circuit to generate a first driving signal, and by setting a second current-limiting resistor in the second amplification path to limit the current of the output signal of the second amplification circuit to generate a second driving signal, when the output times of the first driving signal and the second driving signal are inconsistent, the current of the second driving signal input in reverse to the first amplification path can be limited by the first current-limiting resistor, or the current of the first driving signal input in reverse to the second amplification path can be limited by the second current-limiting resistor. Therefore, it is possible to avoid the amplification path with a later output driving signal in the first amplification path and the second amplification path being reverse-broken down by the earlier output driving signal, thereby improving the reliability of the driving circuit.

[0010] In conjunction with the first aspect, in one possible implementation, the aforementioned current-limiting device is a diode, wherein the output terminal of the amplifier circuit is connected to the positive terminal of the diode, and the negative terminals of the diodes in each amplification path are coupled.

[0011] Based on this scheme, by setting diodes in each amplification path, when the output time of the drive signals of each amplification path is inconsistent, the diodes can limit the reverse input drive signals of each amplification path, thereby preventing each amplification path from being broken down by the reverse input drive signals and improving the reliability of the drive circuit.

[0012] In conjunction with the first aspect, in one possible implementation, the aforementioned driving circuit is implemented as a driving chip.

[0013] Based on this solution, by integrating the aforementioned driving circuit into the driving chip, the area of ​​the driving circuit can be reduced, and the power consumption of the driving circuit can also be reduced.

[0014] In conjunction with the first aspect, in one possible implementation, the various amplifier circuits in the aforementioned driving circuit are integrated into a driving chip.

[0015] Based on this solution, by integrating each amplifier circuit in the above-mentioned driving circuit into the driving chip, the area of ​​the driving circuit can be reduced, and the power consumption of the driving circuit can also be reduced.

[0016] The second aspect of this application provides a power supply circuit, which includes a driving circuit and a switching circuit. The output terminal of the driving circuit is coupled to the input terminal of the switching circuit. The structure of the driving circuit can be the structure of the driving circuit described in the first aspect or any possible implementation of the first aspect.

[0017] In conjunction with the second aspect, in one possible implementation, the power supply circuit also includes an input resistor coupled to the input terminal of the drive circuit.

[0018] Based on this scheme, by setting the input resistor, the current of the control signal can be limited, the rise time of the output voltage of the amplification path in the drive circuit can be reduced, and the output settling speed of the amplification path can be improved.

[0019] In conjunction with the second aspect, in one possible implementation, the aforementioned input resistance is less than 20Ω.

[0020] A third aspect of this application provides a server, which includes a power supply circuit and electronic components coupled to the power supply circuit. The power supply circuit is used to supply power to the electronic components, and the structure of the power supply circuit can be the structure of the power supply circuit described in the second aspect or any possible implementation of the second aspect.

[0021] The descriptions of the second and third aspects in this application can be referenced to the detailed description of the first aspect; and the beneficial effects of the second and third aspects can be referenced to the analysis of the beneficial effects of the first aspect, which will not be repeated here. Attached Figure Description

[0022] Figure 1 This is a schematic diagram illustrating an application scenario of a driving circuit provided in an embodiment of this application;

[0023] Figure 2 A schematic diagram of a voltage-time curve provided in an embodiment of this application;

[0024] Figure 3 This is a schematic diagram illustrating another application scenario of the driving circuit provided in the embodiments of this application;

[0025] Figure 4 This is a schematic diagram illustrating another application scenario of the driving circuit provided in the embodiments of this application;

[0026] Figure 5 This is a schematic diagram of a driving circuit provided in an embodiment of this application;

[0027] Figure 6 This is a schematic diagram of the structure of a driver chip provided in an embodiment of this application;

[0028] Figure 7 A schematic diagram of a power supply circuit provided in an embodiment of this application;

[0029] Figure 8 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0030] The following sections will discuss the fabrication and use of various embodiments in detail. However, it should be understood that many applicable inventive concepts provided in this application can be implemented in a variety of specific environments. The specific embodiments discussed are merely illustrative of specific ways of implementing and using this description and technology, and do not limit the scope of this application.

[0031] Unless otherwise defined, all technical terms used herein have the same meaning as commonly known to one of ordinary skill in the art.

[0032] Each circuit or other component may be described or referred to as "for" performing one or more tasks. In this context, "for" is used to imply a structure by indicating that the circuit / component includes a structure (e.g., a circuit system) that performs one or more tasks during operation. Therefore, even when the specified circuit / component is currently inoperable (e.g., not turned on), it can still be referred to as "for performing that task." Circuits / components used with the term "for" include hardware, such as circuits that perform operations.

[0033] The technical solutions in the embodiments of this application will be described below with reference to the accompanying drawings. In this application, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, or B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the related objects before and after are in an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can mean: a, b, c, a and b, a and c, b and c, or a, b, and c, where a, b, and c can be single or multiple. In addition, in the embodiments of this application, the words "first," "second," etc., do not limit the quantity or order.

[0034] It should be noted that, in this application, the terms "exemplary" or "for example" are used to indicate that something is being described as an example, illustration, or illustration. Any embodiment or design described as "exemplary" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or design solutions. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0035] Before introducing the embodiments of this application, the background technology involved in this application will be described first.

[0036] A switching power supply circuit includes a series-coupled control circuit, a drive circuit, and a switching circuit. The drive circuit amplifies the control signal generated by the control circuit to generate a drive signal, thereby controlling the rapid switching on and off of the switching circuit. The drive circuit includes multiple parallel amplification paths to improve its current amplification capability, meeting the drive signal requirements of the switching circuit.

[0037] like Figure 1The diagram illustrates an application scenario of a driving circuit 100 provided in an embodiment of this application. The driving circuit 100 is series-coupled with a switching circuit 200. The driving circuit 100 includes parallel-coupled amplification paths 110 and 120. The input terminals of amplification paths 110 and 120 are coupled to the output terminal of a control circuit, and the output terminals of amplification paths 110 and 120 are coupled to the input terminal of the switching circuit 200. Amplification path 110 includes an amplifier circuit A1, and amplification path 120 includes an amplifier circuit A2. Amplifier circuits A1 and A2 have the same circuit structure and device parameters, and both include amplifiers. Amplifier circuits A1 and A2 are coupled to a ground terminal. The driving circuit 100 receives a control signal through its input terminal and amplifies the control signal. Specifically, the driving circuit 100 amplifies half of the control signal through amplifier circuit A1 in amplification path 110 to generate a first driving signal. The drive circuit 100 amplifies the other half of the control signal through the amplifier circuit A2 in the amplification path 120 to generate a second drive signal. The first drive signal and the second drive signal are combined to form a third drive signal, which is used to control the switching circuit 200 to turn on or off. It can be understood that the current of the third drive signal is the sum of the current of the first drive signal and the current of the second drive signal.

[0038] The aforementioned drive circuit 100 amplifies half of the control signal through amplification paths 110 and 120 respectively to generate a first drive signal and a second drive signal. These two drive signals are combined to generate a third drive signal, which provides a large current drive to the switching circuit 200. The current of the third drive signal is greater than the current of either the first or second drive signal. It is understood that amplifying half of the control signal through amplification paths 110 and 120 respectively improves the current amplification capability of the drive circuit 100, thereby improving the conduction and switching characteristics of the switching transistor in the switching circuit 200.

[0039] However, the inventors discovered that in the aforementioned drive circuit 100, differences in manufacturing processes and input threshold turn-on voltages can increase the output delay time of the amplification path. For example, there may be parameter differences in the internal circuitry of amplification paths 110 and 120, such as manufacturing errors in the parameters of resistors, capacitors, inductors, or amplifiers. These parameter differences cause the output drive signals of amplification paths 110 and 120 to be out of sync. This results in a potential difference between the amplification path with the earlier output drive signal and the amplification path with the later output drive signal. Current flows in reverse from the amplification path with the earlier output drive signal to the amplification path with the later output drive signal, causing reverse breakdown of the amplification circuit in that path. At this point, a path to ground is formed at the output of drive circuit 100, leading to drive circuit 100 failure and reduced reliability.

[0040] like Figure 2 The diagram shows the voltage-time curves of the two amplification paths in the drive circuit. The first curve represents the input voltage of amplification paths 110 and 120 changing with time; the second curve represents the output voltage of amplification path 110 changing with time; and the third curve represents the output voltage of amplification path 120 changing with time. In the amplification paths, when the input or output voltage changes, the voltage change curve corresponding to 10%-90% of the difference between the maximum and minimum voltages, based on the minimum voltage, is relatively stable. Generally, the turn-on time and rise time are calculated based on the moment corresponding to 10%-90% of the difference between the maximum and minimum voltages.

[0041] Taking the maximum input voltage of amplification paths 110 and 120 as V2 and the minimum as V1, and the maximum output voltage of amplification paths 110 and 120 as V4 and the minimum as V3 as an example: The turn-on time TD1 of amplification path 110 is from t1 to t2, and the rise time Tr1 is from t2 to t3; the turn-on time TD2 of amplification path 120 is from t1 to t4, and the rise time Tr2 is from t4 to t5. Here, t1 corresponds to 10% (V2-V1) of the input voltage V1; t2 and t4 correspond to 10% (V4-V3) of the output voltage V3; and t3 and t5 correspond to 90% (V4-V3) of the output voltage V3.

[0042] Understandably, the turn-on time TD1 of amplification path 110 is earlier than the turn-on time TD2 of amplification path 120. When amplification path 110 outputs the first driving signal, amplification path 120 has not yet output the second driving signal. The first driving signal will flow in reverse through the output terminal of amplification path 120 into amplification circuit A2, breaking down amplification circuit A2 in amplification path 120. This causes the output terminal of amplification circuit A2 to short-circuit with the ground terminal. Amplification path 110 and amplification path 120 form a path to the ground terminal, and drive circuit 100 will be unable to output the driving signal normally.

[0043] To address the low reliability issue caused by the inconsistent output times of amplification paths 110 and 120 in the aforementioned drive circuit 100, this application provides a drive circuit that improves the amplification capability of the drive circuit by connecting multiple amplification paths in parallel, provides a drive signal that meets the requirements of the switching circuit, and prevents the inconsistent output times of multiple paths from reducing the reliability of the drive circuit.

[0044] like Figure 3 The diagram illustrates an application scenario of a driving circuit 300 provided in this application embodiment. The driving circuit 300 includes multiple amplification paths, all with identical circuit structures and component parameters. Each amplification path includes a series-coupled amplifier circuit and a current-limiting device. The input terminals of the amplifier circuits in each amplification path are coupled, and the output terminals of the amplifier circuits are coupled to one end of the current-limiting device. The other end of the current-limiting device in each amplification path is also coupled. The output voltage of the driving circuit is less than or equal to 20V.

[0045] It should be noted that the embodiments of this application use the driving circuit 300, including the first amplification path 310 and the second amplification path 320, as an example for illustrative purposes. Figure 3 The specific structure of the driving circuit 300 is illustrative and does not constitute a limitation on the embodiments of this application.

[0046] In one possible implementation, such as Figure 3 As shown, the current-limiting device is a current-limiting resistor. The first amplification path 310 includes a first amplification circuit A1 and a first current-limiting resistor R1 coupled in series, and the second amplification path 320 includes a second amplification circuit A2 and a second current-limiting resistor R2 coupled in series. The input terminals of the first amplification circuit A1 and the second amplification circuit A2 are coupled to a first node 330 as the input terminals of the driving circuit 300, which is used to receive control signals. The output terminal of the first amplification circuit A1 is coupled to one end of the first current-limiting resistor R1, the output terminal of the second amplification circuit A2 is coupled to one end of the second current-limiting resistor R2, and the other ends of the first current-limiting resistor R1 and the second current-limiting resistor R2 are coupled to a second node 340 as the output terminals of the driving circuit 300.

[0047] Optionally, the control signal mentioned above can be a pulse width modulation (PWM) signal. This application does not limit the specific type of control signal in its embodiments.

[0048] The aforementioned driving circuit 300 is used to amplify the control signal. Specifically, the driving circuit 300 amplifies half of the control signal through the first amplification circuit A1 in the first amplification path 310 to generate a first driving signal. The driving circuit 300 amplifies the other half of the control signal through the second amplification circuit A2 in the second amplification path 320 to generate a second driving signal. Then, the first driving signal and the second driving signal are combined to form a third driving signal.

[0049] Understandably, both the first amplifier circuit A1 and the second amplifier circuit A2 mentioned above include corresponding amplifiers, which are used to amplify the control signal. The current of the third drive signal is the sum of the current of the first drive signal and the current of the second drive signal. The current of the third drive signal is greater than the current of the first drive signal and also greater than the current of the second drive signal.

[0050] In this embodiment, current-limiting resistors are provided in each of the multiple amplification paths of the driving circuit 300. For example, in the driving circuit 300, a first current-limiting resistor R1 is added to the first amplification path 310, and a second current-limiting resistor R2 is added to the second amplification path 320. When the first amplification path 310 and the second amplification path 320 output the first driving signal at different times due to differences in internal device parameters, if the first amplification path 310 outputs the first driving signal first, then when the first driving signal flows in reverse to the second amplification path 320, the current-limiting resistors R1 and R2 will limit the current flowing through the amplifier in the second amplification circuit A2. This effectively prevents the amplifier in the amplification path that outputs the driving signal later in the first amplification path 310 and the second amplification path 320 from being reverse-broken down by the first driving signal output earlier, thereby improving the reliability of the driving circuit.

[0051] For example, combining Figure 2Taking the input voltage curves of the first amplification path 310 and the second amplification path 320 as the first curve, the output voltage curve as the second curve, and the output voltage curve of the second amplification path 320 as the third curve, with the first amplification path 310 outputting a first drive signal at time t2 and the second amplification path 320 outputting a second drive signal at time t4, and the output current value of the first amplification circuit A1 and the second amplification circuit A2 being 7A, and the reverse breakdown current of the amplifier in the second amplification circuit A2 in the second amplification path 320 being 5A as an example. Assuming that the first amplification circuit first outputs a drive voltage, this drive signal limits the current flowing to the second amplification circuit A2 through the first current-limiting resistor R1 and the second current-limiting resistor R2, generating an inflow signal with a current value of 4A. The current value of this signal is less than the reverse breakdown current of the amplifier in the second amplification circuit A2, and will not reverse break down the amplifier in the second amplification circuit A2.

[0052] In one possible implementation, the current-limiting resistor is less than 100Ω. For example, both the first current-limiting resistor R1 and the second current-limiting resistor R2 are less than 20Ω. In this implementation, by setting a smaller resistor as the current-limiting device, a significant impact on the drive current is prevented, thereby reducing the impact of increasing the current-limiting resistor on the driving capability of the switching circuit. This allows for improved reliability of the drive circuit while ensuring high-current driving capability.

[0053] The amplification paths of the aforementioned driving circuit 300 have the same circuit structure and corresponding component parameters. Specifically, the circuit structure and component parameters of the first amplification circuit A1 and the second amplification circuit A2 are identical. The resistance values ​​of the first current-limiting resistor R1 and the second current-limiting resistor R2 are equal.

[0054] Optionally, the driving circuit 300 further includes a first enable terminal for enabling the first amplifier circuit A1 and a second enable terminal for enabling the second amplifier circuit A2.

[0055] Optionally, when the first enable terminal and the second enable terminal receive a high level, the first amplifier circuit A1 and the second amplifier circuit A2 are in a conducting state; or, when the first enable terminal and the second enable terminal receive a low level, the first amplifier circuit A1 and the second amplifier circuit A2 are in a conducting state. This application embodiment does not limit what type of level the first enable terminal and the second enable terminal receive to conduct the first amplifier circuit A1 and the second amplifier circuit A2.

[0056] For example, the first enable terminal and the second enable terminal can receive a high level to turn on the first amplifier circuit A1 and the second amplifier circuit A2, so that the first amplifier path 310 outputs the first drive signal and the second amplifier path 320 outputs the second drive signal. The two drive signals are combined into a third drive signal at the second node 340.

[0057] Optionally, the output voltage of the aforementioned drive circuit 300 is less than or equal to 20V. For example, the drive output voltage can be 12V, thereby improving the compatibility of the drive circuit with the server power supply.

[0058] In one possible implementation, the current-limiting device is a diode, with the output terminals of multiple amplifier circuits coupled to the positive terminals of the diodes, and the negative terminals of the diodes in each amplification path coupled to the negative terminals. For example, as... Figure 4 As shown, the output terminal of the first amplifier circuit A1 is connected to the positive terminal of the first diode D1, the output terminal of the second amplifier circuit A2 is connected to the positive terminal of the second diode D2, and the negative terminals of the first diode D1 and the second diode D2 are coupled to the second node 340.

[0059] Combination Figure 3 or Figure 4 The output terminal of the aforementioned driving circuit 300 is coupled to the input terminal of the switching circuit 400.

[0060] Optionally, the switching circuit 400 described above includes a switching transistor, which can be a transistor, such as a metal-oxide-semiconductor field-effect transistor (MOSFET) or an insulated gate bipolar transistor (IGBT). The specific type of switching transistor is not limited in the embodiments of this application.

[0061] Optionally, the aforementioned switching circuit 400 may include a first switching transistor 411 and a second switching transistor 412 coupled in parallel. The first switching transistor 411 is coupled to the second node 340 through a third resistor R3, and the second switching transistor 412 is coupled to the second node 340 through a fourth resistor R4. The aforementioned driving circuit 300 is used to control the on or off state of the first switching transistor 411 and the second switching transistor 412. The third resistor R3 is used to reduce the instantaneous voltage stress on the first switching transistor 411 during switching, thereby protecting the first switching transistor 411. The fourth resistor R4 is used to reduce the instantaneous voltage stress on the second switching transistor 412 during switching, thereby protecting the second switching transistor 412 and preventing both switches from being burned out by large current. The embodiments of this application do not limit the specific number of switching transistors included in the switching circuit 400.

[0062] The driving circuit 300 provided in this application embodiment amplifies multiple control signals through multiple amplification paths to generate multiple driving signals. These multiple amplification paths are then combined into a single driving signal at their outputs, thus increasing the current of the driving signal. Secondly, by incorporating current-limiting devices in each amplification path, when the output times of the driving signals in each amplification path are inconsistent, the current-limiting devices can limit the reverse input driving signals of each amplification path, preventing breakdown of each amplification path by the reverse input driving signal and improving the reliability of the driving circuit. Furthermore, by setting the multiple amplification paths to have the same circuit structure and component parameters, the driving signals output by each amplification path can have the same amplitude, allowing for better fusion of the multiple driving signals.

[0063] In one feasible approach, some or all of the components in the aforementioned driving circuit 300 can be integrated into a driving chip. For example, in the driving circuit 300, except for the current-limiting resistor, all other components in the amplification paths can be integrated into a single driving chip; or, the amplification circuits and corresponding current-limiting resistors in all the amplification paths of the aforementioned driving circuit 300 can be integrated into a single driving chip. This integrated circuit approach reduces the area and power consumption of the driving circuit 300.

[0064] In one possible implementation, the amplifier circuit in the driver circuit 300 can be implemented as a driver chip. For example... Figure 5 As shown, the first amplifier circuit A1 and the second amplifier circuit A2 can be disposed in the driver chip 350. The driver chip 350 includes a first input terminal, a second input terminal, a first output terminal, and a second output terminal. The first amplifier circuit A1 is disposed between the first input terminal and the first output terminal, and the second amplifier circuit A2 is disposed between the second input terminal and the second output terminal. The first input terminal serves as the input terminal of the first amplification path 310, and the second input terminal serves as the input terminal of the second amplification path 320. The first input terminal and the second input terminal are coupled to a first node 330, which serves as the input terminal of the driver circuit 300. The first output terminal is coupled to one end of the first current-limiting resistor R1, and the second output terminal is coupled to one end of the second current-limiting resistor R2. The other ends of the first current-limiting resistor R1 and the second current-limiting resistor R2 are coupled to a second node 340, which serves as the output terminal of the driver circuit 300.

[0065] Optionally, the driver chip 350 may also include an enable terminal for controlling the operation of each amplifier circuit, as well as a voltage terminal VDD and a ground terminal GND for supplying power to the driver chip 350. For example, a first enable terminal for controlling the first amplifier circuit A1 and a second enable terminal for controlling the second amplifier circuit A2 may be provided.

[0066] The driving circuit 300 provided in this application embodiment reduces power consumption by incorporating the amplification circuits in the at least two amplification paths into the driving chip 350, compared to using discrete amplification circuits.

[0067] In one possible implementation, the driving circuit 300 can be implemented as a driving chip, such as... Figure 6 As shown in the illustration, this application also provides a driver chip 600, which includes a first input terminal and a second input terminal, as well as a first output terminal and a second output terminal. A first amplification path 610 is provided between the first input terminal and the first output terminal, and a second amplification path 620 is provided between the second input terminal and the second output terminal. The first amplification path 610 includes a first amplifier circuit A1 and a first current-limiting resistor R1 coupled in series, and the second amplification path 620 includes a second amplifier circuit A2 and a second current-limiting resistor R2 coupled in series.

[0068] Optionally, the driver chip 600 further includes a first enable terminal for enabling the first amplifier circuit A1, a second enable terminal for enabling the second amplifier circuit A2, and a voltage terminal VDD and a ground terminal GND for supplying power to the driver chip 600.

[0069] Optionally, the driver chip 600 may also include other amplification paths. When the driver chip 600 includes more amplification paths, these more amplification paths may include corresponding amplification circuits and current-limiting resistors, thereby enabling the driver chip 600 to output a drive signal with a larger current. The embodiments of this application do not limit the specific number of amplification paths included in the driver chip 600. Figure 6 The following explanation uses only two amplification paths as examples.

[0070] The driver chip 600 provided in this application embodiment provides a larger drive signal by setting a series-coupled amplifier circuit and a current-limiting resistor in each amplification path, coupling the input terminals of multiple amplification paths, coupling the output terminals of multiple amplification paths, and combining the drive signals output by multiple amplification paths. Moreover, when the output drive signals of multiple amplification paths are not in sync, the current-limiting resistor set in each amplification path can prevent the amplification path with a later output drive signal from being reverse-broken by the earlier output drive signal, thereby improving the reliability of the driver chip 600.

[0071] Based on this, such as Figure 7 As shown in the figure, this application embodiment also provides a power supply circuit 700, which includes a series-coupled input resistor 710, a drive circuit 720, and a switching circuit 730. The structure of the drive circuit 720 can be as described above. Figure 3 , Figure 4 , Figure 5and Figure 6 The structure of the driving circuit 300 is not described in detail in this embodiment.

[0072] The aforementioned input resistor 710 is used to receive control signals and limit the current of the control signals, thereby reducing the rise time of the amplification path in the drive circuit 720 and improving the output setup speed of the amplification path.

[0073] For example, combining Figure 2 Taking the driving circuit 720 as an example, which includes a first amplification path 721 and a second amplification path 722, and the output voltage curves of the first amplification path 721 and the second amplification path 722 are the second curves, the rise time Tr1 of the first amplification path 721 and the second amplification path 722 is from t3 to t4. By setting the input resistor 710, the rise time Tr1 can be reduced, the slope dv / dt of the second curve when it rises can be increased, and thus the output set-up speed of the amplification path can be improved.

[0074] Optionally, the resistance of the input resistor 710 is less than 20Ω. The specific value of the input resistor 710 is not limited in this embodiment.

[0075] The power supply circuit 700 provided in this application embodiment, by setting an input resistor 710, allows the control signal to pass through the input resistor 710 before being input into the drive circuit 720. This can limit the current of the control signal, reduce the rise time of the control signal in the amplification path, improve the output setup speed of the amplification path, improve the output delay of each amplification circuit, and thus improve the reliability of the drive circuit 720.

[0076] On the other hand, such as Figure 8 As shown, this application embodiment provides an electronic device 800, which includes a power supply circuit 810 and an electronic component 820. The power supply circuit 810 supplies power to the electronic component 820. The structure of the power supply circuit 810 can be as described above. Figure 7 The structure of the 700 power supply circuit.

[0077] Optionally, the electronic device 800 can be a server, and the electronic components 820 include: motherboard, processor, memory, baseboard management controller (BMC), fan, etc.

[0078] It should be noted that the relevant descriptions of the driving circuit 300 provided above can all be applied to the electronic device 800, and will not be repeated here in the embodiments of this application.

[0079] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A drive circuit characterized by comprising: The driving circuit includes multiple amplification paths; the multiple amplification paths have the same circuit structure and component parameters; each amplification path includes a series-coupled amplification circuit and a current-limiting device; the input terminals of the amplification circuits in each amplification path are coupled; the output terminal of the amplification circuit is coupled to one end of the current-limiting device; and the other end of the current-limiting device in each amplification path is coupled. The output voltage of the driving circuit is less than or equal to 20V; the current limiting device includes a current limiting resistor or a diode.

2. The drive circuit according to claim 1, characterized in that, The current-limiting device is a current-limiting resistor; the current-limiting resistor is less than 100Ω.

3. The drive circuit according to claim 2, characterized in that, The driving circuit includes two amplification paths, namely a first amplification path and a second amplification path; wherein the first amplification path and the second amplification path have the same structure and component parameters. The first amplification path includes a first amplification circuit and a first current-limiting resistor coupled in series; The second amplification path includes a second amplifier circuit coupled in series and a second current-limiting resistor; The input terminal of the first amplifier circuit is coupled to the input terminal of the second amplifier circuit; The output terminal of the first amplifier circuit is coupled to one end of the first current-limiting resistor; The output terminal of the second amplifier circuit is coupled to one end of the second current-limiting resistor; The other end of the first current-limiting resistor is coupled to the other end of the second current-limiting resistor.

4. The drive circuit according to claim 1, characterized by The current limiting device is a diode; wherein, the output terminal of the amplifier circuit of each amplification path is connected to the positive terminal of the diode; the negative terminal of the diode in each amplification path is coupled.

5. The drive circuit according to any one of claims 1 to 4, characterized by The driving circuit is implemented as a driving chip.

6. The drive circuit according to any one of claims 1 to 4, characterized by The amplifier circuits in the driving circuit are integrated into a driving chip.

7. A power supply circuit, characterized by comprising: The power supply circuit includes a switching circuit and a driving circuit as described in any one of claims 1-6; the output terminal of the driving circuit is coupled to the input terminal of the switching circuit; the driving circuit is used to provide a driving current signal to the switching circuit.

8. The power supply circuit according to claim 7, characterized in that, The power supply circuit also includes an input resistor, which is coupled to the input terminal of the drive circuit.

9. The power supply circuit according to claim 8, characterized in that, The input resistance is less than 20Ω.

10. A server, characterized in that, The server includes electronic components and a power supply circuit as described in any one of claims 7-9; the power supply circuit is coupled to the electronic components; the power supply circuit is used to supply power to the electronic components.

Images