Power supply input circuit and power supply system

Abstract

The application provides a power input circuit and a power supply system. The power input circuit comprises: a first power supply branch and a second power supply branch, the first power supply branch is used for connecting a first input end of a power supply device, and the second power supply branch is used for connecting a second input end of the power supply device; an energy storage unit, one end of the energy storage unit is coupled to the first power supply branch, and the other end of the energy storage unit is coupled to the second power supply branch; and a current control circuit, an input end of the current control circuit is connected with the second power supply branch, an output end of the current control circuit is connected with the energy storage unit, and the current control circuit is used for controlling the charging current size of the energy storage unit. The application can control the charging current of the energy storage unit to be appropriately increased to quickly complete the power-on process, and can also adjust the increasing speed of the charging current according to the size of the charging current, so that the phenomenon of sharp peak current in the power-on process of the power supply device is finally avoided.

Description

Technical Field

[0001] This application relates to the field of power supply system technology, specifically to a power input circuit and a power supply system. Background Technology

[0002] Currently, low-voltage direct current (LVDC) power supplies may generate peak current flowing into electrical equipment at the moment of power-on. Since this peak current is much larger than the steady-state input current, failure to suppress the surge current phenomenon will lead to damage to the electrical equipment.

[0003] In related technologies, negative temperature coefficient (NTC) thermistors are typically used to slow down the charging speed of the downstream capacitor. Once the capacitor is fully charged, the bypass output power is switched on to reduce power system conduction losses. However, although NTC thermistors have low initial temperature and high resistance, as surge current passes through, the thermistor's temperature rises, causing its resistance to decrease. This leads to an increase in the capacitor's charging current. If this increase in charging current is not suppressed, peak current may eventually occur, potentially damaging electrical equipment. Summary of the Invention

[0004] This application provides a power input circuit and a power system, which aims to solve the technical problem of peak current that may occur when thermistors suppress surge current.

[0005] In a first aspect, this application provides a power input circuit, comprising:

[0006] A first power supply branch and a second power supply branch, wherein the first power supply branch is used to connect to the first input terminal of the power supply device, and the second power supply branch is used to connect to the second input terminal of the power supply device.

[0007] An energy storage unit, one end of which is coupled to a first power supply branch and the other end of which is coupled to a second power supply branch;

[0008] The current control circuit has its input terminal connected to the second power supply branch and its output terminal connected to the energy storage unit. The current control circuit is used to control the charging current of the energy storage unit.

[0009] During the power supply process, the current control circuit controls the charging current to gradually increase, and the magnitude of the charging current is inversely proportional to the rate of increase of the charging current.

[0010] In some embodiments, the current control circuit includes a switching module and a switching suppression module;

[0011] The first terminal of the switch suppression module is connected to the first terminal of the switch module, the second terminal of the switch suppression module is connected to the control terminal of the switch module, and the second terminal of the switch module is electrically connected to the second power supply branch.

[0012] The switching module is used to control the charging current of the energy storage unit, and the switching suppression module is used to suppress the rate of increase of the charging current based on the magnitude of the charging current.

[0013] In some embodiments, at the initial moment of power-on of the power supply device, the switching module is disconnected and the switching suppression module accumulates charge;

[0014] At the midpoint of the power supply device's power-on, the switching module is turned on, the energy storage unit is charged, and the switching suppression module releases charge to the control terminal of the switching module to suppress the rate of increase of the charging current flowing through the switching module.

[0015] In some embodiments, the switching module includes a first MOSFET, and the switching suppression module includes a first capacitor;

[0016] The gate of the first MOSFET is connected to the first power supply branch, the source of the first MOSFET is connected to the second power supply branch, and the drain of the first MOSFET is connected to one end of the energy storage unit.

[0017] The first plate of the first capacitor is connected to the gate of the first MOSFET, and the second plate of the first capacitor is connected to the first node between the first MOSFET and the energy storage unit.

[0018] At the initial moment when the power supply device is powered on, the first MOSFET is turned off and the first plate of the first capacitor accumulates negative charge;

[0019] At the midpoint of the power supply device being powered on, the first MOSFET is linearly turned on, the energy storage unit is charged, and the first plate of the first capacitor releases negative charge to the gate of the first MOSFET to suppress the rise rate of the gate voltage of the first MOSFET.

[0020] In some embodiments, the switching module further includes a second capacitor;

[0021] The first plate of the second capacitor is connected to the gate of the first MOSFET, and the second plate of the second capacitor is connected to the second power supply branch.

[0022] In some embodiments, the switching module further includes a first Zener diode;

[0023] The first terminal of the first Zener diode is connected to the second power supply branch, and the second terminal of the first Zener diode is connected to the first plate of the second capacitor.

[0024] In some embodiments, the switching module further includes a second Zener diode;

[0025] The first terminal of the second Zener diode is connected to the first power supply branch, and the second terminal of the second Zener diode is connected to the first plate of the second capacitor.

[0026] In some embodiments, the power input circuit further includes a transient diode;

[0027] The first terminal of the transient diode is connected to the source of the first MOSFET, and the second terminal of the transient diode is connected to the drain of the first MOSFET.

[0028] In some embodiments, the power input circuit further includes a filtering module, which includes a third capacitor, a fourth capacitor, and a common-mode inductor, wherein the common-mode inductor has a first inductor coil and a second inductor coil.

[0029] The first inductor is connected in series in the first power supply branch, the first plate of the third capacitor is connected to one end of the first inductor, and the first plate of the fourth capacitor is connected to the other end of the first inductor.

[0030] The second inductor is connected in series in the second power supply branch, the second plate of the third capacitor is connected to one end of the second inductor, and the second plate of the fourth capacitor is connected to the other end of the second inductor.

[0031] Secondly, this application provides a power supply system including the power input circuit as described in the first aspect.

[0032] In this application, during the power-on process of the power supply device, the current control circuit can change the rate of increase of the charging current according to the magnitude of the charging current. For example, when the charging current of the energy storage unit is too large, the current control circuit can reduce the rate of increase of the charging current of the energy storage unit, thereby avoiding the phenomenon of peak current during the power-on process of the power supply device; conversely, when the charging current of the energy storage unit increases slowly, the current control circuit can increase the rate of increase of the charging current of the energy storage unit, so that the charging current of the energy storage unit is appropriately increased to ensure the charging speed of the energy storage unit, so that the power input circuit can quickly complete the power-on process.

[0033] In other words, the current control circuit in this application can not only control the charging current of the energy storage unit to increase appropriately to quickly complete the power-on process, but also adjust the rate of increase of the charging current according to the magnitude of the charging current, so as to avoid the phenomenon of peak current during the power-on process of the power supply device. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of a power input circuit provided in an embodiment of this application;

[0036] Figure 2 This is another schematic diagram of the power input circuit provided in the embodiments of this application;

[0037] Figure 3 This is a circuit diagram of a power input circuit provided in an embodiment of this application;

[0038] Figure 4 This is another circuit diagram of the power input circuit provided in the embodiments of this application.

[0039] Among them, there is a first power supply branch 10, a second power supply branch 20, an energy storage unit 30, a current control circuit 40, a switching module 41, a switching suppression module 42, and a filtering module 50.

[0040] First MOSFET Q1, first capacitor C6, second capacitor C4, first Zener diode ZD2, second Zener diode ZD1, transient diode TVS1, energy storage capacitor C1, third capacitor C2, fourth capacitor C3.

[0041] Power input circuit 100, power supply device 200. Detailed Implementation

[0042] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0044] In this application, the term "exemplary" is used to mean "serving as an example, illustration, or description." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use the invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that the invention can be made without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of the invention with unnecessary detail. Therefore, the invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0045] This application provides a power input circuit and a power system, which will be described in detail below.

[0046] First, refer to Figure 1 , Figure 1 This paper shows a schematic diagram of a power input circuit 100 according to an embodiment of the present application, wherein the power input circuit 100 includes:

[0047] The first power supply branch 10 and the second power supply branch 20 are used to connect to the first input terminal of the power supply device 200, and the second power supply branch 20 is used to connect to the second input terminal of the power supply device 200.

[0048] Energy storage unit 30, one end of which is coupled to the first power supply branch 10, and the other end of which is coupled to the second power supply branch 20;

[0049] The current control circuit 40 has its input terminal connected to the second power supply branch 20 and its output terminal connected to the energy storage unit 30. The current control circuit 40 is used to control the charging current of the energy storage unit 30.

[0050] During the power supply process of the power supply device 200, the current control circuit 40 controls the charging current to gradually increase, and the magnitude of the charging current is inversely proportional to the rate of increase of the charging current.

[0051] Specifically, the first input terminal of the power supply device 200 can refer to the positive terminal of the power supply device 200, and the second input terminal of the power supply device 200 can refer to the negative terminal of the power supply device 200. In some embodiments of this application, the power supply device 200 can provide DC power to the power input circuit 100. After the power input circuit 100 is connected to the power supply device 200 and the load device (e.g., a rechargeable battery pack or a charging vehicle), the power supply device 200 can charge the load device through the first power branch 10 and the second power branch 20 of the power input circuit 100. In some embodiments of this application, the power supply device 200 can provide AC power to the power input circuit 100. The power input circuit 100 may include a rectifier circuit to convert the AC power into DC power and charge the load device.

[0052] As an example, the power supply device 200 may include a transformer, a rectifier circuit, and a filter circuit. The transformer converts the high-voltage AC power input from the power grid into low-voltage AC power, and the rectifier circuit and filter circuit obtain low-voltage DC power so as to provide the converted low-voltage DC power to the power input circuit 100.

[0053] Understandably, the power supply device 200 can also refer to any circuit or electrical device that provides AC or DC power to the power input circuit 100; the first power branch 10 and the second power branch 20 can use any conductive line, such as conductive lines formed of copper, iron or other alloys, without specific limitations.

[0054] The energy storage unit 30 connects the first power supply branch 10 and the second power supply branch 20. When the energy storage unit 30 is fully charged, if there are current fluctuations in the current provided by the power supply device 200 or the current in the power input circuit 100, the energy storage unit 30 can ensure the stability of the output current of the first power supply branch 10 and the second power supply branch 20 when the current of the power supply device 200 or the power input circuit 100 fluctuates. In some embodiments of this application, the energy storage unit 30 may include a capacitor, with one end plate connected to the first power supply branch 10 and the other end plate connected to the second power supply branch 20. When the capacitor is fully charged, it stores charge to suppress DC power supply voltage fluctuations.

[0055] Understandably, the energy storage unit 30 may also include an electrical element with a capacitor structure, such as a MOSFET, using the capacitor structure formed by the gate metal plate and the substrate metal plate of the MOSFET as the energy storage unit 30 for storing charge.

[0056] It should be noted that in the embodiments of this application, "connection" can be understood as electrical connection. The connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, the connection between A and B can be a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components.

[0057] The current control circuit 40 can control the charging current of the energy storage unit 30 to prevent damage caused by peak charging current during the power supply device 200's power-on process. In some embodiments of this application, the current control circuit 40 may include a MOSFET, which operates in the linear region to change the charging current of the energy storage unit 30. In some embodiments of this application, the current control circuit 40 may also include a variable resistor, changing the resistance of the variable resistor to change the charging current of the energy storage unit 30.

[0058] In this embodiment, during the power-on process of the power supply device 200, the current control circuit 40 can change the rate of increase of the charging current according to the magnitude of the charging current. For example, when the charging current of the energy storage unit 30 is too large, the current control circuit 40 can reduce the rate of increase of the charging current of the energy storage unit 30, thereby avoiding the phenomenon of peak current during the power-on process of the power supply device 200. Conversely, when the rate of increase of the charging current of the energy storage unit 30 is slow, the current control circuit 40 can increase the rate of increase of the charging current of the energy storage unit 30, so that the charging current of the energy storage unit 30 is appropriately increased to ensure the charging speed of the energy storage unit 30, so that the power input circuit 100 can quickly complete the power-on process.

[0059] In other words, the current control circuit 40 in this application can not only control the charging current of the energy storage unit 30 to increase appropriately to quickly complete the power-on process, but also adjust the rate of increase of the charging current according to the magnitude of the charging current, so as to ultimately avoid the phenomenon of peak current during the power-on process of the power supply device 200.

[0060] In some embodiments of this application, see further reference. Figure 2 , Figure 2A schematic diagram of a power input circuit 100 in an embodiment of this application is shown, wherein the current control circuit 40 includes a switching module 41 and a switching suppression module 42; the first end of the switching suppression module 42 is connected to the first end of the switching module 41, the second end of the switching suppression module 42 is connected to the control end of the switching module 41, and the second end of the switching module 41 is electrically connected to the second power branch 20; the switching module 41 is used to control the magnitude of the charging current of the energy storage unit 30, and the switching suppression module 42 is used to suppress the rate of increase of the charging current according to the magnitude of the charging current.

[0061] It should be noted that during the power-on process of the power supply device 200, the switch suppression module 42 can control the switch module 41 according to the magnitude of the charging current, thereby suppressing the rate of increase of the charging current. For example, see... Figure 2 At the initial moment when the power supply device 200 is powered on (i.e., the instant the power supply device 200 is powered on), the switch module 41 is disconnected and the switch suppression module 42 accumulates charge. At the intermediate moment when the power supply device 200 is powered on (at any moment during the power supply device 200 power-on process), the switch module 41 is turned on, the energy storage unit 30 is charged, and at the same time, the switch suppression module 42 releases charge to the control terminal of the switch module 41. After receiving the charge, the control terminal of the switch module 41 suppresses the rate of increase of the charging current flowing through the switch module 41.

[0062] As an example, see Figure 3 , Figure 3 A schematic diagram of a power input circuit 100 in an embodiment of this application is shown, wherein the switching module 41 includes a first MOSFET Q1, and the switching suppression module 42 includes a first capacitor C6; the gate of the first MOSFET Q1 is connected to the first power supply branch 10, the source of the first MOSFET Q1 is connected to the second power supply branch 20, and the drain of the first MOSFET Q1 is connected to one end of the energy storage unit 30; the first plate of the first capacitor C6 is connected to the gate of the first MOSFET Q1, and the second plate of the first capacitor C6 is connected to the first node M1 between the first MOSFET Q1 and the energy storage unit 30.

[0063] Specifically, at the initial moment of power-on of the power supply device 200, the first MOSFET Q1 is turned off. Since the energy storage capacitor C1 corresponding to the energy storage unit 30 is directly connected to the first power supply branch 10, the first power supply branch 10 charges one side plate of the energy storage capacitor C1, accumulating a small amount of positive charge, while the other side plate of the energy storage capacitor C1 accumulates some negative charge and transfers positive charge to the second plate of the first capacitor C6, thereby causing the first plate of the first capacitor C6 to accumulate negative charge. Subsequently, at the intermediate moment of power-on of the power supply device 200, the first power supply branch 10 slowly charges the gate metal plate of the first MOSFET Q1, accumulating positive charge. The charge causes the first MOSFET Q1 to conduct linearly, and the energy storage capacitor C1 to charge. As the energy storage capacitor C1 charges, the voltage at the first node M1 between the first MOSFET Q1 and the energy storage unit 30 decreases. Therefore, the first capacitor C6 will discharge, and the first plate of the first capacitor C6 will release negative charge to the gate of the first MOSFET Q1. This suppresses the rise rate of the gate voltage of the first MOSFET Q1 during the power-on process, and ultimately keeps the first MOSFET Q1 in the linear region for a short time, thus avoiding the peak current phenomenon that occurs during the power supply device 200 power-on process.

[0064] It should be noted that the larger the charging current of the energy storage capacitor C1, the more charge the energy storage capacitor C1 accumulates, and the faster the voltage drop rate of the first node M1 between the first MOSFET Q1 and the energy storage unit 30 is. Therefore, the more negative charge is released from the first plate of the first capacitor C6 to the gate of the first MOSFET Q1, thus suppressing the rise rate of the gate voltage of the first MOSFET Q1 (i.e., suppressing the increase rate of the charging current) when the charging current is large. Conversely, when the charging current of the energy storage capacitor C1 is small, the voltage drop rate of the first node M1 between the first MOSFET Q1 and the energy storage unit 30 is small. Therefore, the amount of negative charge released from the first plate of the first capacitor C6 to the gate of the first MOSFET Q1 is small, thus appropriately increasing the rise rate of the gate voltage of the first MOSFET Q1 (i.e., increasing the increase rate of the charging current) when the charging current is small.

[0065] Understandably, the first MOSFET can be a PMOS, NMOS, or IGBT. The first capacitor C6 can also be replaced by a device with a capacitor structure, such as a MOSFET, which connects the source and drain of the MOSFET so that the gate metal plate of the MOSFET and the substrate metal plate form a capacitor structure and accumulate charge at the initial moment when the power supply device 200 is powered on.

[0066] In some embodiments of this application, see further reference. Figure 3The switching module 41 further includes a second capacitor C4. The first plate of the second capacitor C4 is connected to the gate of the first MOSFET Q1, and the second plate of the second capacitor C4 is connected to the second power supply branch 20. Specifically, during the power-on process of the power supply device 200, the first power supply branch 10 needs to charge both the gate metal plate of the first MOSFET Q1 and the first plate of the second capacitor C4 simultaneously. This slows down the rate at which charge accumulates on the gate metal plate of the first MOSFET Q1, ultimately preventing the gate voltage of the first MOSFET Q1 from rising rapidly during the power-on process of the power supply device 200.

[0067] Understandably, the width-to-length ratio of the first MOSFET Q1 can also be changed to increase the area of ​​the gate metal plate of the first MOSFET Q1, thereby slowing down the rise rate of the gate voltage of the first MOSFET Q1.

[0068] In some embodiments of this application, see further reference. Figure 3 The switching module 41 further includes a first Zener diode ZD2. The first terminal of the first Zener diode ZD2 is connected to the second power supply branch 20, and the second terminal of the first Zener diode ZD2 is connected to the second plate of the second capacitor C4. Specifically, since the first plate of the second capacitor C4 is connected to the gate of the first MOSFET Q1, the second terminal of the first Zener diode ZD2 is also connected to the gate of the first MOSFET Q1. Because the Zener diode has voltage regulation characteristics, it can stabilize the gate of the first MOSFET Q1 at a preset voltage (e.g., 12V) when the second capacitor C4 is fully charged. This ensures that the first MOSFET Q1 operates in the saturation region after the power supply device 200 is powered on, and avoids damage to the first MOSFET Q1 due to excessively high gate voltage.

[0069] Furthermore, in some embodiments of this application, see further reference. Figure 3 The switching module 41 further includes a second Zener diode ZD1. The first terminal of the second Zener diode ZD1 is connected to the first power supply branch 10, and the second terminal of the second Zener diode ZD1 is connected to the first plate of the second capacitor C4. That is, the second terminal of the second Zener diode ZD1 is also connected to the gate of the first MOSFET Q1. Since the first Zener diode ZD2 is connected to the first power supply branch 10, and the second Zener diode ZD1 is connected to the second power supply branch 20, for the gate of the first MOSFET Q1, the first Zener diode ZD2 and the second Zener diode ZD1 can stabilize the gate voltage of the first MOSFET Q1 from both the ground terminal and the power supply terminal, preventing the gate voltage of the first MOSFET Q1 from being directly pulled down to the ground terminal voltage or directly pulled up to the power supply voltage.

[0070] In some embodiments of this application, see Figure 4 , Figure 4 The diagram illustrates another circuit diagram of the power input circuit 100 in an embodiment of this application. The power input circuit 100 further includes a transient diode TVS1. The first terminal of the transient diode TVS1 is connected to the source of the first MOSFET Q1, and the second terminal of the transient diode TVS1 is connected to the drain of the first MOSFET Q1. Specifically, when the voltage between the source and drain of the first MOSFET Q1 exceeds the specified operating range (e.g., a lightning strike), the transient diode TVS1 will break down and conduct momentarily, allowing it to bypass the lightning current of the first MOSFET Q1, thereby ensuring the safety of the first MOSFET Q1.

[0071] In some embodiments of this application, see further reference. Figure 4 The power input circuit 100 further includes a filter module 50, which includes a third capacitor C2, a fourth capacitor C3, and a common-mode inductor. The common-mode inductor has a first inductor coil CLF1 and a second inductor coil SQ2118. The first inductor coil CLF1 is connected in series with the first power supply branch 10. The first plate of the third capacitor C2 is connected to one end of the first inductor coil CLF1, and the first plate of the fourth capacitor C3 is connected to the other end of the first inductor coil CLF1. The second inductor coil SQ2118 is connected in series with the second power supply branch 20. The second plate of the third capacitor C2 is connected to one end of the second inductor coil SQ2118, and the second plate of the fourth capacitor C3 is connected to the other end of the second inductor coil SQ2118.

[0072] Specifically, the third capacitor C2, the fourth capacitor C3, and the common-mode inductor form an EMI filter module. Since the third capacitor C2 and the fourth capacitor C3 have the characteristic of passing high frequencies and blocking low frequencies, the high-frequency current of the first power supply branch 10 can be input into the second power supply branch 20 through the third capacitor C2 and the fourth capacitor C3 to return, thereby avoiding the phenomenon of the first power supply branch 10 and the second power supply branch 20 outputting high-frequency AC current signals. At the same time, since the first inductor coil CLF1 and the second inductor coil SQ2118 of the common-mode inductor have high impedance characteristics, the common-mode inductor can reflect the high-frequency interference current back to the interference source (such as the AC power line), thereby avoiding the phenomenon of the DC current of the first power supply branch 10 and the second power supply branch 20 being subject to electromagnetic interference.

[0073] It is worth noting that the above description of the power input circuit 100 is intended to clearly illustrate the implementation and verification process of this application. Those skilled in the art can also make equivalent modifications under the guidance of this application, for example, such as... Figure 3 or Figure 4As shown, a current-limiting resistor R5 can also be connected in series between the first capacitor C6 and the gate of the first MOS transistor Q1; for example, a current-limiting resistor R1 can also be connected in series between the second Zener diode ZD1 and the first power supply branch 10; for another example, a current-limiting resistor R2 can also be connected in parallel across the two ends of the second capacitor C4.

[0074] Furthermore, to better implement the power input circuit 100 in the embodiments of this application, based on the power input circuit 100, this application also provides a power system, which includes the power input circuit 100 as described in any of the above embodiments. Since the power system in the embodiments of this application has all the beneficial effects of the power input circuit 100 described above due to the inclusion of the power input circuit 100, it will not be described again here.

[0075] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the detailed descriptions of other embodiments above, which will not be repeated here.

[0076] The basic concepts have been described above. Obviously, for those skilled in the art, the detailed disclosure above is merely illustrative and does not constitute a limitation of this application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are suggested in this application, and therefore remain within the spirit and scope of the exemplary embodiments of this application.

[0077] Furthermore, this application uses specific terms to describe embodiments of the application. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of the application. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0078] Similarly, it should be noted that, in order to simplify the description of the present application and thus aid in the understanding of one or more embodiments of the invention, the foregoing description of the embodiments of the present application sometimes combines multiple features into a single embodiment, drawing, or description thereof. However, this disclosure method does not imply that the subject matter of the application requires more features than those mentioned in the claims. In fact, the embodiments contain fewer features than all the features of the single embodiments disclosed above.

[0079] In some embodiments, numbers describing the quantity of components and attributes are used. It should be understood that such numbers used in the description of embodiments are modified in some examples with the terms "approximately," "approximately," or "generally." Unless otherwise stated, "approximately," "approximately," or "generally" indicates that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may be changed depending on the characteristics required by individual embodiments. In some embodiments, numerical parameters should take into account specified significant digits and employ a general method of digit reservation. Although the numerical ranges and parameters used to confirm their breadth of scope in some embodiments of this application are approximate values, in specific embodiments, such values ​​are set as precisely as feasible.

[0080] For each patent, patent application, patent application publication, and other material such as articles, books, specifications, publications, and documents referenced in this application, the entire contents of that patent application are incorporated herein by reference, except for historical application documents that are inconsistent with or conflict with the content of this application, and documents that limit the broadest scope of the claims of this application (currently or subsequently appended to this application). It should be noted that if there are any inconsistencies or conflicts between the descriptions, definitions, and / or terminology used in the supplementary materials of this application and the content of this application, the descriptions, definitions, and / or terminology used in this application shall prevail.

[0081] The power input circuit 100 and power system provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A power input circuit, characterized in that, The power input circuit includes: A first power supply branch and a second power supply branch, wherein the first power supply branch is used to connect to the first input terminal of the power supply device, and the second power supply branch is used to connect to the second input terminal of the power supply device. An energy storage unit, one end of which is coupled to the first power supply branch and the other end of which is coupled to the second power supply branch; A current control circuit is provided, wherein the input terminal of the current control circuit is connected to the second power supply branch, and the output terminal of the current control circuit is connected to the energy storage unit. The current control circuit is used to control the charging current of the energy storage unit. During the power-on process of the power supply device, the current control circuit controls the charging current to gradually increase, and the magnitude of the charging current is inversely proportional to the rate of increase of the charging current. The current control circuit includes a switching module and a switching suppression module; the first terminal of the switching suppression module is connected to the first terminal of the switching module, the second terminal of the switching suppression module is connected to the control terminal of the switching module, and the second terminal of the switching module is electrically connected to the second power supply branch. The switching module is used to control the magnitude of the charging current of the energy storage unit, and the switching suppression module is used to suppress the rate of increase of the charging current according to the magnitude of the charging current. At the initial moment when the power supply device is powered on, the switching module is disconnected and the switching suppression module accumulates charge; At the midpoint of the power supply device being powered on, the switch module is turned on and the switch suppression module releases charge to the control terminal of the switch module to suppress the rate of increase of the charging current flowing through the switch module.

2. The power input circuit as described in claim 1, characterized in that, The switching module includes a first MOSFET, and the switching suppression module includes a first capacitor; The gate of the first MOS transistor is connected to the first power supply branch, the source of the first MOS transistor is connected to the second power supply branch, and the drain of the first MOS transistor is connected to one end of the energy storage unit. The first plate of the first capacitor is connected to the gate of the first MOS transistor, and the second plate of the first capacitor is connected to the first node between the first MOS transistor and the energy storage unit. At the initial moment when the power supply device is powered on, the first MOS transistor is turned off and the first plate of the first capacitor accumulates negative charge; At the midpoint of the power supply device being powered on, the first MOSFET is linearly turned on, the energy storage unit is charged, and the first plate of the first capacitor releases negative charge to the gate of the first MOSFET to suppress the rise rate of the gate voltage of the first MOSFET.

3. The power input circuit as described in claim 2, characterized in that, The switching module also includes a second capacitor; The first plate of the second capacitor is connected to the gate of the first MOSFET, and the second plate of the second capacitor is connected to the second power supply branch.

4. The power input circuit as described in claim 3, characterized in that, The switching module also includes a first Zener diode; The first end of the first Zener diode is connected to the second power supply branch, and the second end of the first Zener diode is connected to the first plate of the second capacitor.

5. The power input circuit as described in claim 4, characterized in that, The switching module also includes a second Zener diode; The first end of the second Zener diode is connected to the first power supply branch, and the second end of the second Zener diode is connected to the first plate of the second capacitor.

6. The power input circuit as described in claim 2, characterized in that, The power input circuit also includes a transient diode; The first terminal of the transient diode is connected to the source of the first MOS transistor, and the second terminal of the transient diode is connected to the drain of the first MOS transistor.

7. The power input circuit as described in claim 1, characterized in that, The power input circuit also includes a filtering module, which includes a third capacitor, a fourth capacitor, and a common-mode inductor. The common-mode inductor has a first inductor coil and a second inductor coil. The first inductor is connected in series in the first power supply branch, the first plate of the third capacitor is connected to one end of the first inductor, and the first plate of the fourth capacitor is connected to the other end of the first inductor. The second inductor is connected in series in the second power supply branch, the second plate of the third capacitor is connected to one end of the second inductor, and the second plate of the fourth capacitor is connected to the other end of the second inductor.

8. A power supply system, characterized in that, The power supply system includes the power input circuit as described in any one of claims 1 to 7.

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