Switching power supply and adjustable inductance assembly

Abstract

The application provides a switching power supply and an adjustable inductance component. The switching power supply comprises a control circuit, a DC voltage transformation unit, an inverter unit and at least one adjustable inductance component. The first end of the at least one adjustable inductance component is coupled with the output end of a DC power supply or the AC end of the inverter unit. The second end of the at least one adjustable inductance component is coupled with the first DC end of the DC voltage transformation unit or an AC power grid. The second DC end of the DC voltage transformation unit is coupled with the DC end of the inverter unit. The adjustable inductance component comprises a plurality of inductances and at least one controllable switch. The control circuit is used to control the controllable switch in any adjustable inductance component to be on or off, so as to control the equivalent inductance of any adjustable inductance component. By using the application, the inductance attenuation of the power inductance in the switching power supply can be avoided in the transient overcurrent, and the stability and safety of the switching power supply in the overcurrent condition are enhanced.

Description

Technical Field

[0001] This application relates to the field of electronic power, and more particularly to a switching power supply and an adjustable inductor assembly. Background Technology

[0002] A switching power supply is a high-frequency power conversion device, a type of power supply. Widely used, its main function is to convert a voltage at a given level into the voltage or current required by the user through various architectures. Typically, the components of a switching power supply (such as semiconductor devices and power inductors) are designed according to rated operating conditions with a certain margin. However, in certain scenarios (such as transient overcurrent scenarios), the inductance of the power inductor, limited by the bias characteristics of the magnetic material, decreases with increasing current. Since the rate of current increase is inversely proportional to the basic definition of inductance, this inductance decay accelerates the current increase in the switching power supply (such as the current in the chopper bridge arm). This increased current further leads to inductance decay in the power inductor, ultimately resulting in a vicious cycle of overcurrent effects, causing significant device overheating and overstress problems. Therefore, solving the problem of rapid inductance decay caused by the bias characteristics of power inductors in transient overcurrent scenarios is one of the urgent technical challenges to be addressed. Summary of the Invention

[0003] This application provides a switching power supply and an adjustable inductor assembly, which can prevent the inductance of the power inductor in the switching power supply from decreasing during transient overcurrent, thereby enhancing the stability and safety of the switching power supply under overcurrent conditions.

[0004] In a first aspect, this application provides a switching power supply, which includes a control circuit, a DC transformer unit, an inverter unit, and at least one adjustable inductor component. A first terminal of the at least one adjustable inductor component is coupled to the output terminal of the DC power supply or the AC terminal of the inverter unit. A second terminal of the at least one adjustable inductor component is coupled to the first DC terminal of the DC transformer unit or the AC mains. The second DC terminal of the DC transformer unit is coupled to the DC terminal of the inverter unit. Here, the adjustable inductor component includes multiple inductors and at least one controllable switch. The control circuit can be used to control the controllable switch in any adjustable inductor component to turn on or off, thereby controlling the equivalent inductance value of any adjustable inductor component.

[0005] In this application, the switching power supply can control the controllable switches in each adjustable inductor component to increase the equivalent inductance value of the adjustable inductor component when overcurrent or overvoltage conditions are detected by the control circuit. This avoids the problem of inductance decay of the power inductor in the switching power supply during transient overcurrent, prevents the vicious cycle of current increase and inductance decay, and can stabilize the inductance of each power inductor under transient overcurrent conditions. This enhances the stability and safety of the switching power supply under overcurrent conditions and has strong applicability.

[0006] In conjunction with the first aspect, in a first possible implementation, the at least one adjustable inductor component includes a first adjustable inductor component. The first end of the first adjustable inductor component is coupled to the output terminal of the DC power supply, and the second end of the first adjustable inductor component is coupled to the first DC terminal of the DC transformer unit. Here, the first adjustable inductor component includes multiple inductors and a controllable switch. When the control circuit detects overcurrent or overvoltage conditions in the DC transformer unit, it controls the controllable switch in the first adjustable inductor component to increase the equivalent inductance value of the first adjustable inductor component. This avoids inductance attenuation of the power inductor in the switching power supply under transient overcurrent conditions, thereby enhancing the stability and safety of the switching power supply operation under overcurrent conditions.

[0007] In conjunction with the first aspect, in a second possible implementation, the inverter unit includes at least one DC / AC conversion circuit, and the at least one adjustable inductor component includes at least one second adjustable inductor component. One of the at least one DC / AC conversion circuits is coupled to the AC power grid through one of the at least one second adjustable inductor component. Here, the second adjustable inductor component includes multiple inductors and a controllable switch. When the inverter unit detects overcurrent or overvoltage conditions, the switching power supply can control the controllable switch in the second adjustable inductor component to increase the equivalent inductance value of the second adjustable inductor component. This avoids the inductance attenuation of the power inductor in the switching power supply under transient overcurrent conditions, thereby enhancing the stability and safety of the switching power supply operation under overcurrent conditions.

[0008] In conjunction with the first aspect, in a third possible implementation, the inverter unit includes at least one DC / AC conversion circuit, the at least one adjustable inductor component includes a first adjustable inductor component and at least one second adjustable inductor component, the first end of the first adjustable inductor component is coupled to the output end of the DC power supply, the second end of the first adjustable inductor component is coupled to the first DC end of the DC transformer unit, and one of the at least one DC / AC conversion circuits is coupled to the AC power grid through one of the at least one second adjustable inductor component. Here, the first and second adjustable inductor components include multiple inductors and controllable switches. When the control circuit detects overcurrent or overvoltage conditions in the DC transformer unit and inverter unit, the switching power supply can control the controllable switches in the first and second adjustable inductor components to increase the equivalent inductance of the first and second adjustable inductor components. This avoids the inductance of the power inductor in the switching power supply attenuation under transient overcurrent conditions, thereby enhancing the stability and safety of the switching power supply under overcurrent conditions.

[0009] In a fourth possible implementation, in conjunction with the first or third possible implementation of the first aspect, the control circuit is used to control the equivalent inductance of the first adjustable inductor component to increase when the inductance attenuation parameter of the inductor in the first adjustable inductor component or the inductance attenuation parameter of any switch in the DC transformer unit exceeds a preset threshold. The switching power supply detects the inductance attenuation parameter of the inductor in the first adjustable inductor component or any switch in the DC transformer unit through the control circuit to determine whether inductance attenuation has occurred, and controls the controllable switch in the first adjustable inductor component when inductance attenuation occurs, thereby preventing inductance attenuation of the power inductor in the switching power supply under transient overcurrent conditions.

[0010] In a fifth possible implementation, in conjunction with the second or third possible implementation of the first aspect, the control circuit is used to control the equivalent inductance of the second adjustable inductor component to increase when the inductance attenuation parameter of the inductor in the second adjustable inductor component or the inductance attenuation parameter of any switch in the inverter unit exceeds a preset threshold. The switching power supply detects the inductance attenuation parameter of the inductor in the second adjustable inductor component or any switch in the inverter unit through the control circuit to determine whether inductance attenuation has occurred, and controls the controllable switch in the second adjustable inductor component when inductance attenuation occurs, thereby preventing inductance attenuation of the power inductor in the switching power supply under transient overcurrent conditions.

[0011] In conjunction with the fourth or fifth possible implementation of the first aspect, in the sixth possible implementation, the first adjustable inductor assembly or the second adjustable inductor assembly includes a first inductor and at least one second inductor, the first inductor and the second inductor are connected in series, the first inductor is connected in parallel with a first controllable switch, and one of the second inductors is connected in parallel with one second controllable switch. The control circuit is used to control the first controllable switch to turn off and control at least one of the second controllable switches to turn on, thereby increasing the equivalent inductance value of the first adjustable inductor assembly or the second adjustable inductor assembly. The switching power supply detects the inductance decay parameter of the first inductor or any switching transistor through the control circuit to determine whether the inductance of the first inductor has decayed. When the inductance of the first inductor decays, it controls the controllable switches connected in parallel with each inductor to connect the second inductor to the current carrying circuit of the switching power supply. This improves the equivalent inductance of the first or second adjustable inductor component, avoids the inductance decay of the power inductor in the switching power supply under transient overcurrent conditions, and enhances the stability and safety of the switching power supply under overcurrent conditions.

[0012] In a seventh possible implementation, combining the fourth or fifth possible implementation of the first aspect, the first adjustable inductor component or the second adjustable inductor component includes a first inductor and at least one second inductor, the first inductor and the second inductor being connected in series, and one second inductor being connected in parallel with a controllable switch. The control circuit controls the conduction of one or more of the controllable switches connected in parallel with each of the second inductors, thereby increasing the equivalent inductance of the first adjustable inductor component or the second adjustable inductor component. The switching power supply detects the inductance decay parameter of the first inductor or any switching transistor through the control circuit to determine whether the first inductor has experienced inductance decay, and controls the controllable switches connected in parallel with each inductor when the inductance of the first inductor decays, so as to connect the second inductor to the current-carrying circuit of the switching power supply, thereby increasing the equivalent inductance of the first adjustable inductor component or the second adjustable inductor component, avoiding inductance decay of the power inductor in the switching power supply under transient overcurrent conditions, and enhancing the stability and safety of the switching power supply operation under overcurrent conditions.

[0013] In conjunction with the fourth or fifth possible implementation of the first aspect, in the eighth possible implementation, the aforementioned first adjustable inductor component or the aforementioned second adjustable inductor component includes a first inductor, a second inductor, and a single-pole double-throw controllable switch. The first end of the first inductor and the first end of the second inductor are connected in parallel to serve as one end of the aforementioned first adjustable inductor component or the aforementioned second adjustable inductor component. The second ends of the first inductor and the second end of the second inductor are respectively connected to the first moving contact and the second moving contact of the aforementioned single-pole double-throw controllable switch. The stationary contact of the aforementioned single-pole double-throw controllable switch serves as the other end of the aforementioned first adjustable inductor component or the aforementioned second adjustable inductor component. The aforementioned control circuit is used to control the stationary contact and the second moving contact of the aforementioned single-pole double-throw controllable switch to conduct, thereby controlling the increase of the equivalent inductance value of the aforementioned first adjustable inductor component or the aforementioned second adjustable inductor component. The switching power supply detects the inductance decay parameter of the first inductor or any switching transistor through the control circuit to determine whether the inductance of the first inductor has decayed. When the inductance of the first inductor decays, it controls a single-pole double-throw controllable switch to connect the second inductor to the current carrying circuit of the switching power supply. This improves the equivalent inductance of the first or second adjustable inductor component, avoids the inductance decay of the power inductor in the switching power supply under transient overcurrent conditions, and enhances the stability and safety of the switching power supply under overcurrent conditions.

[0014] In a ninth possible implementation, in conjunction with the fourth or fifth possible implementation of the first aspect, the aforementioned first or second adjustable inductor assembly includes a first inductor, a second inductor, and a single-pole double-throw (SPDT) controllable switch. The first and second inductors are connected in series. The first end of the first inductor is connected to the first moving contact of the SPDT controllable switch, the second end of the first inductor is connected to the first end of the second inductor, and the second end of the second inductor is connected to the second moving contact of the SPDT controllable switch. The connection end of the first and second inductors is connected to the stationary contact of the SPDT controllable switch. The control circuit is used to control the stationary contact of the SPDT controllable switch to conduct with the first moving contact, thereby increasing the equivalent inductance of the first or second adjustable inductor assembly. The switching power supply detects the inductance decay parameter of the first inductor or any switching transistor through the control circuit to determine whether the inductance of the first inductor has decayed. When the inductance of the first inductor decays, it controls a single-pole double-throw controllable switch to connect the second inductor to the current carrying circuit of the switching power supply. This improves the equivalent inductance of the first or second adjustable inductor component, avoids the inductance decay of the power inductor in the switching power supply under transient overcurrent conditions, and enhances the stability and safety of the switching power supply under overcurrent conditions.

[0015] In a tenth possible embodiment, combining any one of the sixth to ninth possible embodiments of the first aspect, the aforementioned inductance attenuation parameter includes one of voltage value, current value, voltage change rate, current change rate, instantaneous power, and average power. The switching power supply determines whether inductance attenuation occurs based on the voltage value, current value, voltage change rate, current change rate, instantaneous power, or average power of the inductor or any switching transistor through a control circuit. Inductance attenuation detection methods are diverse and highly applicable.

[0016] In conjunction with any of the possible embodiments of the first aspect to the ninth possible embodiment, in the eleventh possible embodiment, the DC transformer unit includes two switching transistors connected in series, and the connection terminal of the two switching transistors serves as the first DC terminal of the DC transformer unit. The inverter unit includes three DC / AC conversion circuits connected in parallel, each DC / AC conversion circuit including a first and a second switching transistor connected in series, and a third and a fourth switching transistor connected in series. The second switching transistor is connected to the third switching transistor, and the connection terminals of the first and second switching transistors, and the connection terminals of the third and fourth switching transistors, are respectively connected to the output terminal of any of the DC / AC conversion circuits through a switching transistor. The switching power supply can, through the control circuit, control the controllable switches in the first and second adjustable inductor components to increase the equivalent inductance value of the first and second adjustable inductor components when overcurrent or overvoltage conditions are detected in the DC transformer unit and the inverter unit, thereby avoiding the inductance attenuation of the power inductor in the switching power supply under transient overcurrent conditions and enhancing the stability and safety of the switching power supply operation under overcurrent conditions.

[0017] Secondly, this application provides an adjustable inductor component for use in a switching power supply, the switching power supply including a DC transformer unit and an inverter unit. The first end of the adjustable inductor component is coupled to the output terminal of the DC power supply or the AC terminal of the inverter unit, the second end of the adjustable inductor component is coupled to the first DC terminal of the DC transformer unit or the AC power grid, and the second DC terminal of the DC transformer unit is coupled to the DC terminal of the inverter unit. The adjustable inductor component includes multiple inductors and at least one controllable switch, the adjustable inductor component being used to control the equivalent inductance value of the adjustable inductor component by turning it on or off through the at least one controllable switch.

[0018] In this application, the adjustable inductor components in the switching power supply can increase the equivalent inductance value of the adjustable inductor components by turning on or off the controllable switches in each adjustable inductor component when overcurrent or overvoltage occurs. This avoids the problem of inductance decay of the power inductor in the switching power supply during transient overcurrent, prevents the vicious cycle of current increase and inductance decay, and can stabilize the inductance of each power inductor under transient overcurrent conditions. This enhances the stability and safety of the switching power supply under overcurrent conditions and has strong applicability.

[0019] In conjunction with the second aspect, in a first possible implementation, the adjustable inductor assembly includes a first inductor and at least one second inductor, the first inductor and the second inductor being connected in series, the first inductor being connected in parallel with a first controllable switch, and each of the second inductors being connected in parallel with a second controllable switch. The adjustable inductor assembly is used to control the increase of the equivalent inductance value of the adjustable inductor assembly when the inductance attenuation parameter of the inductor in the adjustable inductor assembly, or the inductance attenuation parameter of any switch in the inverter unit and the DC transformer unit, exceeds a preset threshold. This is achieved by turning off the first controllable switch and turning on at least one of the second controllable switches. When the inductance of the first inductor attenuates, the adjustable inductor assembly connects the second inductor to the current-carrying circuit of the switching power supply by turning on or off the controllable switches connected in parallel with each inductor, thereby increasing the equivalent inductance value of the adjustable inductor assembly, avoiding inductance attenuation of the power inductor in the switching power supply under transient overcurrent conditions, and enhancing the stability and safety of the switching power supply operation under overcurrent conditions.

[0020] In conjunction with the second aspect, in a second possible implementation, the adjustable inductor assembly includes a first inductor and at least one second inductor, the first and second inductors being connected in series, and each second inductor being connected in parallel with a controllable switch. When the inductance attenuation parameter of the inductor in the adjustable inductor assembly, or the inductance attenuation parameter of any switch in the inverter unit and the DC transformer unit, exceeds a preset threshold, the effective inductance of the adjustable inductor assembly is increased by turning on one or more of the controllable switches connected in parallel with the second inductors. When the inductance of the first inductor attenuates, the controllable switches connected in parallel with the inductors are turned on or off to connect the second inductor to the current-carrying circuit of the switching power supply, thereby increasing the effective inductance of the adjustable inductor assembly, avoiding inductance attenuation of the power inductor in the switching power supply under transient overcurrent conditions, and enhancing the stability and safety of the switching power supply operation under overcurrent conditions.

[0021] In conjunction with the second aspect, in a third possible implementation, the aforementioned adjustable inductor assembly includes a first inductor, a second inductor, and a single-pole double-throw (SPDT) controllable switch. The first terminals of the first and second inductors are connected in parallel to serve as one end of either the first or second adjustable inductor assembly. The second terminals of the first and second inductors are respectively connected to the first and second moving contacts of the SPDT controllable switch. The stationary contact of the SPDT controllable switch serves as the other end of either the first or second adjustable inductor assembly. The adjustable inductor assembly is used to control the increase of the equivalent inductance value of the adjustable inductor assembly by connecting the stationary contact and the second moving contact of the SPDT controllable switch when the inductance attenuation parameter of the inductor in the adjustable inductor assembly, or the inductance attenuation parameter of any switching transistor in the inverter unit and the DC transformer unit, exceeds a preset threshold. When the inductance of the first inductor decays, the aforementioned adjustable inductor component connects the second inductor to the current-carrying circuit of the switching power supply by turning on or off the single-pole double-throw controllable switch. This improves the equivalent inductance of the adjustable inductor component, avoids the inductance decay of the power inductor in the switching power supply under transient overcurrent conditions, and enhances the stability and safety of the switching power supply under overcurrent conditions.

[0022] In conjunction with the second aspect, in a fourth possible implementation, the adjustable inductor assembly includes a first inductor, a second inductor, and a single-pole double-throw (SPDT) controllable switch. The first inductor and the second inductor are connected in series. The first end of the first inductor is connected to the first moving contact of the SPDT controllable switch, the second end of the first inductor is connected to the first end of the second inductor, and the second end of the second inductor is connected to the second moving contact of the SPDT controllable switch. The connection end of the first and second inductors is connected to the stationary contact of the SPDT controllable switch. The adjustable inductor assembly is used to control the increase of the equivalent inductance of the adjustable inductor assembly when the inductance attenuation parameter of the inductor in the adjustable inductor assembly, or the inductance attenuation parameter of any switching transistor in the inverter unit and the DC transformer unit, exceeds a preset threshold. This is achieved by connecting the stationary contact of the SPDT controllable switch to the first moving contact. When the inductance of the first inductor decays, the aforementioned adjustable inductor component connects the second inductor to the current-carrying circuit of the switching power supply by turning on or off the single-pole double-throw controllable switch. This improves the equivalent inductance of the adjustable inductor component, avoids the inductance decay of the power inductor in the switching power supply under transient overcurrent conditions, and enhances the stability and safety of the switching power supply under overcurrent conditions.

[0023] In a fifth possible implementation, combining any of the first to fourth possible implementations of the second aspect, the aforementioned inductance attenuation parameter includes one of voltage value, current value, voltage change rate, current change rate, instantaneous power, and average power. The switching power supply determines whether inductance attenuation occurs based on the voltage value, current value, voltage change rate, current change rate, instantaneous power, or average power of the inductor or any switching transistor through a control circuit. Inductance attenuation detection methods are diverse and highly applicable.

[0024] Thirdly, this application provides a grid power supply system, which includes a DC power supply and a switching power supply provided in the first aspect and any possible implementation thereof. The DC power supply is used to provide DC input to the switching power supply, and the switching power supply is used to perform converter conversion based on the DC input provided by the DC power supply and output AC power to the AC grid. The DC power supply includes at least one of a solar panel or an energy storage battery.

[0025] In this application, the power grid power supply system based on the switching power supply provided in the first aspect above can control the controllable switches in each adjustable inductor component of the switching power supply to increase the equivalent inductance value of the adjustable inductor component when overcurrent or overvoltage conditions are detected. This avoids the problem of inductance decay of the power inductor in the switching power supply during transient overcurrent, prevents the vicious cycle of current increase and inductance decay, and can stabilize the inductance of each power inductor under transient overcurrent conditions. This enhances the stability and safety of the switching power supply under overcurrent conditions and has strong applicability. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the application scenario of the power grid supply system provided in this application;

[0028] Figure 2 This is a structural schematic diagram of the power grid supply system provided in this application;

[0029] Figure 3 This is another structural schematic diagram of the power grid supply system provided in this application;

[0030] Figure 4 This is another structural schematic diagram of the power grid supply system provided in this application;

[0031] Figure 5 This is a schematic diagram of the structure of the switching power supply provided in this application;

[0032] Figure 6 This is another structural schematic diagram of the switching power supply provided in this application;

[0033] Figure 7 This is another structural schematic diagram of the switching power supply provided in this application;

[0034] Figure 8 This is another structural schematic diagram of the switching power supply provided in this application;

[0035] Figure 9 This is another structural schematic diagram of the switching power supply provided in this application;

[0036] Figure 10 This is another structural schematic diagram of the switching power supply provided in this application;

[0037] Figure 11 This is another structural schematic diagram of the switching power supply provided in this application;

[0038] Figure 12 This is another structural schematic diagram of the switching power supply provided in this application;

[0039] Figure 13 This is another structural schematic diagram of the switching power supply provided in this application;

[0040] Figure 14 This is another structural schematic diagram of the switching power supply provided in this application;

[0041] Figure 15a This is a schematic diagram of the structure of the controllable switch provided in this application;

[0042] Figure 15b This is another structural schematic diagram of the controllable switch provided in this application;

[0043] Figure 15c This is another structural schematic diagram of the controllable switch provided in this application. Detailed Implementation

[0044] 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 this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0045] See Figure 1 , Figure 1This is a schematic diagram illustrating an application scenario of the power grid supply system provided in this application. The power grid supply system provided in this application may include a DC power supply and a switching power supply. The DC power supply may consist of a photovoltaic array, the output terminal of which can be connected to the first terminal of the switching power supply, and the second terminal of the switching power supply can be connected to the AC power grid. Figure 1 In the DC power conversion system shown, the photovoltaic array can be composed of one or more photovoltaic strings connected in parallel, and a photovoltaic string can be obtained by connecting one or more photovoltaic modules in series. The switching power supply can change (either by boosting or bucking) the DC power provided by the photovoltaic array, and then perform voltage inversion conversion on the transformed DC power to supply power to electrical equipment such as batteries, communication base stations, or household appliances in the AC power grid.

[0046] For some feasible implementations, please refer again. Figure 1 The DC power supply may also include an energy storage battery. The output terminal of the energy storage battery can be connected to the first terminal of the switching power supply, and the second terminal of the switching power supply can be connected to the AC power grid. The switching power supply can change (either by boosting or bucking) the DC power provided by the energy storage battery, and then perform voltage inversion conversion on the transformed DC power to supply power to batteries, communication base stations, or household appliances in the AC power grid.

[0047] In some feasible implementations, Figure 1 The switching power supply in the system can rectify and convert the AC voltage of the AC grid, and then convert the rectified DC voltage to DC voltage to output DC voltage or DC current to the energy storage battery. The energy storage battery is charged based on the voltage or current output by the switching power supply.

[0048] exist Figure 1 In the application scenario shown, the switching power supply includes a power inductor. During the AC grid power supply process, when the switching power supply experiences a transient overcurrent (e.g., a transient overcurrent flowing through any switch or bridge arm), the inductance of the power inductor decreases as the current increases due to the bias characteristics of the magnetic material. Based on the fundamental definition of inductance, where the rate of current increase is inversely proportional to the inductance, the decrease in inductance accelerates the rate of current increase in the switching power supply. This increase in current further leads to a decrease in the inductance of the power inductor, ultimately resulting in a vicious cycle of overcurrent effects. This leads to severe device overheating and overstress problems in the switching power supply, making the devices prone to damage, reducing reliability, and limiting applicability.

[0049] The power grid supply system provided in this application includes a switching power supply with a control circuit and at least one adjustable inductor component. Each adjustable inductor component includes multiple inductors and a controllable switch. When overcurrent or overvoltage conditions are detected, the switching power supply can control the controllable switch in each adjustable inductor component to increase the equivalent inductance value of the adjustable inductor component. This avoids the problem of inductance decay of the power inductor in the switching power supply during transient overcurrent, preventing a vicious cycle of current increase and inductance decay. It can also stabilize the inductance of each power inductor under transient overcurrent conditions, enhancing the stability and safety of the switching power supply under overcurrent conditions, and has strong applicability.

[0050] See Figure 2 , Figure 2 This is a structural schematic diagram of the power grid supply system provided in this application. Figure 2 The grid power supply system shown includes a DC power supply and a switching power supply. The power supply can be a solar panel, energy storage battery, etc. The input terminal of the switching power supply is coupled to the DC power supply in this grid power supply system, and the output terminal of the switching power supply is coupled to the AC grid. Figure 2 In the power grid system shown, the power supply provides energy input or power input to the switching power supply. The switching power supply performs inverter conversion based on the energy input or power input provided by the DC power supply (which can be DC power conversion of the DC power provided by the DC power supply followed by inverter conversion), and outputs the AC power obtained after inverter conversion to the AC power grid to supply power to the AC power grid.

[0051] In some feasible implementations, Figure 2 In the grid power supply system shown, the aforementioned switching power supply includes a control circuit ( Figure 2 The system comprises a DC transformer unit, an inverter unit, and an adjustable inductor assembly (which may be a first adjustable inductor assembly). The first terminal of the first adjustable inductor assembly is coupled to the output terminal of the DC power supply. The second terminal of the first adjustable inductor assembly is coupled to the first DC terminal of the DC transformer unit. The second DC terminal of the DC transformer unit is coupled to the DC terminal of the inverter unit. The AC terminal of the inverter unit is coupled to the AC power grid. The first adjustable inductor assembly includes multiple inductors and a controllable switch. When the control circuit detects overcurrent or overvoltage conditions in the DC transformer unit, it controls the controllable switch in the first adjustable inductor assembly to increase the equivalent inductance value of the first adjustable inductor assembly. This prevents the inductance of the power inductor in the switching power supply from decreasing under transient overcurrent conditions, thus enhancing the stability and safety of the switching power supply under overcurrent conditions.

[0052] See Figure 3 , Figure 3 This is another structural schematic diagram of the power grid supply system provided in this application. Figure 3The grid power supply system shown includes a DC power supply and a switching power supply. The power supply can be a solar panel, energy storage battery, etc. The input terminal of the switching power supply is coupled to the DC power supply in this grid power supply system, and the output terminal of the switching power supply is coupled to the AC grid. Figure 3 In the grid power supply system shown, the aforementioned switching power supply includes a control circuit ( Figure 3 The system comprises a DC transformer unit, an inverter unit, and an adjustable inductor assembly (which may be a second adjustable inductor assembly). The first terminal of the second adjustable inductor assembly is coupled to the AC terminal of the inverter unit, and the second terminal of the second adjustable inductor assembly is coupled to the AC mains. The first DC terminal of the DC transformer unit is coupled to the output terminal of the DC power supply, and the second DC terminal of the DC transformer unit is coupled to the DC terminal of the inverter unit. The second adjustable inductor assembly includes multiple inductors and a controllable switch. When the inverter unit detects overcurrent or overvoltage conditions, the switching power supply can control the controllable switch in the second adjustable inductor assembly to increase the equivalent inductance value of the second adjustable inductor assembly. This prevents the inductance of the power inductor in the switching power supply from decreasing under transient overcurrent conditions, thereby enhancing the stability and safety of the switching power supply under overcurrent conditions.

[0053] See Figure 4 , Figure 4 This is another structural schematic diagram of the power grid supply system provided in this application. Figure 4 The grid power supply system shown includes a DC power supply and a switching power supply. The power supply can be a solar panel, energy storage battery, etc. The input terminal of the switching power supply is coupled to the DC power supply in this grid power supply system, and the output terminal of the switching power supply is coupled to the AC grid. Figure 4 In the grid power supply system shown, the aforementioned switching power supply includes a control circuit ( Figure 3 The system comprises a DC transformer unit, an inverter unit, and two adjustable inductor components (which may be a first adjustable inductor component and a second adjustable inductor component). The first and second terminals of the first adjustable inductor component are coupled to the output terminal of the DC power supply and the first DC terminal of the DC transformer unit, respectively. The second DC terminal of the DC transformer unit is coupled to the DC terminal of the inverter unit. The first and second terminals of the second adjustable inductor component are coupled to the AC terminal of the inverter unit and the AC mains, respectively. The first and second adjustable inductor components include multiple inductors and controllable switches. When overcurrent or overvoltage conditions are detected in the DC transformer unit or the inverter unit, the switching power supply can control the controllable switches in the first and second adjustable inductor components to increase their equivalent inductance value. This prevents the inductance of the power inductor in the switching power supply from decreasing under transient overcurrent conditions, thus enhancing the stability and safety of the switching power supply under overcurrent conditions.

[0054] The following will combine Figures 5 to 14 The switching power supply provided in the embodiments of this application is illustrated by example. In some feasible implementations, the first adjustable inductor assembly may include a first inductor and at least one second inductor, and the first and second inductors are connected in series between the DC power supply and the DC transformer unit. Please refer to [reference needed]. Figure 5 , Figure 5 This is a schematic diagram of the switching power supply provided in this application. Figure 5 As shown, Figure 5 The first adjustable inductor component of the switching power supply includes a first inductor (referred to as inductor L11 for convenience) and two second inductors (referred to as inductors L12 and L13 for convenience). Inductors L11, L12, and L13 are connected in series and each is connected in parallel with a controllable switch. The control circuit in the switching power supply ( Figure 5(Not shown in the diagram) When the inductance attenuation parameter of inductor L11 exceeds a preset threshold, the control circuit can determine that the switching power supply has experienced overcurrent or overvoltage, i.e., inductance attenuation of inductor L11. Here, the inductance attenuation parameter of inductor L11 can include one of the following: voltage value, current value, voltage change rate, current change rate, instantaneous power, and average power of inductor L11. For example, the inductance attenuation parameter of inductor L11 can be the current value of inductor L11. The control circuit can determine that the switching power supply has experienced overcurrent or overvoltage when it detects that the current value of inductor L11 exceeds the preset threshold. Optionally, the control circuit can also determine that the switching power supply has experienced overcurrent or overvoltage when the inductance attenuation parameter corresponding to any switching transistor in the DC transformer unit exceeds the preset threshold. The inductance attenuation parameter corresponding to any switching transistor can include one of the following: voltage value, current value, voltage change rate, current change rate, instantaneous power, and average power of any switching transistor in the DC transformer unit. The aforementioned control circuit can, when the inductance attenuation parameter of any switch in the inductor L11 or the DC transformer unit exceeds a preset threshold, control the first controllable switch to turn off and control at least one second controllable switch to turn on to increase the equivalent inductance of the first adjustable inductor component. For example, the control circuit can control the first controllable switch to turn off and control one of the second controllable switches to turn on, so that the inductor L11, whose inductance has attenuated due to overcurrent or overvoltage, is bypassed by the first controllable switch, and the inductor L12 or inductor L13 is connected to the current carrying circuit of the switching power supply. Alternatively, the control circuit can control the first controllable switch to turn off and control all the second controllable switches to turn on, so that the inductor L11, whose inductance has attenuated due to overcurrent or overvoltage, is bypassed by the first controllable switch, and the inductors L12 and L13 are connected to the current carrying circuit of the switching power supply. Optionally, the control circuit can also control the first controllable switch to turn on and all the second controllable switches to turn off when the inductance attenuation parameter of any switch in inductor L11 or DC transformer unit recovers to below a preset threshold. The switching power supply detects the inductance attenuation parameter of inductor L11 or any switch in DC transformer unit through the control circuit to determine whether inductor L11 has experienced inductance attenuation. When the inductance of inductor L11 attenuates, it controls the controllable switches connected in parallel with each inductor to connect inductor L12 or inductor L13 to the current-carrying circuit of the switching power supply. This improves the equivalent inductance of the first adjustable inductor component, avoids inductance attenuation of the power inductor in the switching power supply under transient overcurrent conditions, and enhances the stability and safety of the switching power supply under overcurrent conditions.

[0055] In some feasible implementations, the first adjustable inductor assembly may include a first inductor and at least one second inductor, with the first and second inductors connected in series between the DC power supply and the DC transformer unit. (See also...) Figure 6 , Figure 6This is another structural schematic diagram of the switching power supply provided in this application. For example... Figure 6 As shown, Figure 6 The first adjustable inductor component of the switching power supply includes a first inductor (referred to as inductor L11 for convenience) and two second inductors (referred to as inductors L12 and L13 for convenience). Inductors L11, L12, and L13 are connected in series, and inductors L12 and L13 are each connected in parallel with a controllable switch. The control circuit in the switching power supply ( Figure 6 (Not shown in the diagram) When the inductance attenuation parameter of inductor L11 exceeds a preset threshold, the control circuit can determine that the switching power supply has experienced overcurrent or overvoltage, i.e., the inductance of inductor L11 has attenuated. Here, the inductance attenuation parameter of inductor L11 can include one of the following: voltage value, current value, voltage change rate, current change rate, instantaneous power, and average power of inductor L11. For example, the inductance attenuation parameter of inductor L11 can be the current value of inductor L11. The control circuit can determine that the switching power supply has experienced overcurrent or overvoltage when it detects that the current value of inductor L11 exceeds the preset threshold. Optionally, the control circuit can also determine that the switching power supply has experienced overcurrent or overvoltage when the inductance attenuation parameter corresponding to any switching transistor in the DC transformer unit exceeds the preset threshold. The inductance attenuation parameter corresponding to any switching transistor can include one of the following: voltage value, current value, voltage change rate, current change rate, instantaneous power, and average power of any switching transistor in the DC transformer unit. The control circuit described above can control at least one controllable switch to turn on to increase the equivalent inductance of the first adjustable inductor component when the inductance attenuation parameter of any switch in inductor L11 or the DC transformer unit exceeds a preset threshold. For example, the control circuit can control one of the controllable switches to turn on, allowing inductor L12 or inductor L13 to receive current in the switching power supply carrying circuit. Alternatively, the control circuit can control all controllable switches to turn on, allowing inductors L12 and L13 to receive current in the switching power supply carrying circuit. Optionally, the control circuit can also control all controllable switches to turn off when the inductance attenuation parameter of any switch in inductor L11 or the DC transformer unit returns to below a preset threshold. The switching power supply detects the inductance decay parameter of inductor L11 or any of the switching transistors in the aforementioned DC transformer unit through the control circuit to determine whether inductor L11 has experienced inductance decay. When the inductance of inductor L11 decays, inductor L12 or inductor L13 is connected to the current carrying circuit of the switching power supply, thereby improving the equivalent inductance of the first adjustable inductor component, avoiding inductance decay of the power inductor in the switching power supply under transient overcurrent conditions, and enhancing the stability and safety of the switching power supply under overcurrent conditions.

[0056] In some feasible implementations, the aforementioned first adjustable inductor assembly may include a first inductor and a second inductor, and the aforementioned controllable switch is a single-pole double-throw controllable switch; please refer to [the relevant documentation]. Figure 7 , Figure 7 This is another structural schematic diagram of the switching power supply provided in this application. For example... Figure 7 As shown, Figure 7 The first adjustable inductor component of the switching power supply includes a first inductor (referred to as inductor L11 for convenience) and a second inductor (referred to as inductor L12 for convenience). The first ends of inductors L11 and L12 are connected in parallel to form one end of the first adjustable inductor component (which may be the end connected to the DC power supply output). The second ends of inductors L11 and L12 are respectively connected to the first moving contact and the second moving contact of a single-pole double-throw controllable switch. The stationary contact of the single-pole double-throw controllable switch serves as the other end of the first adjustable inductor component (which may be the end coupled to the first DC terminal of the DC transformer unit). The control circuit in the switching power supply (…) Figure 7 (Not shown in the image) When the inductance attenuation parameter of the aforementioned inductor L11 exceeds a preset threshold, the control circuit can determine that the switching power supply has experienced overcurrent or overvoltage, i.e., the inductance of the current inductor L11 has decreased. Here, the inductance attenuation parameter of the aforementioned inductor L11 may include one of the following: voltage value, current value, voltage change rate, current change rate, instantaneous power, and average power of the aforementioned inductor L11. Optionally, the control circuit can also determine that the switching power supply has experienced overcurrent or overvoltage when the inductance attenuation parameter corresponding to any switch in the aforementioned DC transformer unit exceeds a preset threshold. The inductance attenuation parameter corresponding to any switch in the aforementioned DC transformer unit may include one of the following: voltage value, current value, voltage change rate, current change rate, instantaneous power, and average power of the aforementioned switch in the DC transformer unit. When the inductance attenuation parameter of the aforementioned inductor L11 or any switch in the aforementioned DC transformer unit exceeds a preset threshold, the control circuit can control the stationary contact of the aforementioned single-pole double-throw controllable switch to conduct with the second moving contact to increase the equivalent inductance of the aforementioned first adjustable inductor component. Optionally, the control circuit can also control the stationary contact of the single-pole double-throw controllable switch to conduct with the first moving contact when the inductance attenuation parameter of either inductor L11 or any switching transistor in the DC transformer unit recovers to below a preset threshold. The switching power supply detects the inductance attenuation parameter of either inductor L11 or any switching transistor in the DC transformer unit through the control circuit to determine whether inductor L11 has experienced inductance attenuation. When the inductance of inductor L11 attenuates, inductor L12 replaces inductor L11 in the current-carrying circuit of the switching power supply, thereby improving the equivalent inductance of the first adjustable inductor component, avoiding inductance attenuation of the power inductor in the switching power supply under transient overcurrent conditions, and enhancing the stability and safety of the switching power supply operation under overcurrent conditions.

[0057] In some feasible implementations, the first adjustable inductor assembly may include a first inductor and a second inductor, and the first and second inductors are connected in series between the DC power supply and the DC transformer unit. The controllable switch is a single-pole double-throw controllable switch. Please refer to [link to relevant documentation]. Figure 8 , Figure 8 This is another structural schematic diagram of the switching power supply provided in this application. For example... Figure 8 As shown, Figure 8 The first adjustable inductor assembly of the switching power supply includes a first inductor (referred to as inductor L11 for convenience) and a second inductor (referred to as inductor L12 for convenience). Inductors L11 and L12 are connected in series. The first end of inductor L11 is connected to the first moving contact of a single-pole double-throw controllable switch, and the second end of inductor L11 is connected to the first end of inductor L12. The second end of inductor L12 is connected to the second moving contact of the single-pole double-throw controllable switch, and the connection end of inductors L11 and L12 is connected to the stationary contact of the single-pole double-throw controllable switch. The control circuit in the switching power supply (…) Figure 7 (Not shown in the diagram) When the inductance attenuation parameter of the aforementioned inductor L11 exceeds a preset threshold, the control circuit can determine that the switching power supply has experienced overcurrent or overvoltage, i.e., the inductance of the current inductor L11 has decreased. Here, the inductance attenuation parameter of the aforementioned inductor L11 may include one of the following: voltage value, current value, voltage change rate, current change rate, instantaneous power, and average power of the aforementioned inductor L11. Optionally, the control circuit can also determine that the switching power supply has experienced overcurrent or overvoltage when the inductance attenuation parameter corresponding to any switch in the aforementioned DC transformer unit exceeds a preset threshold. The inductance attenuation parameter corresponding to any switch in the aforementioned DC transformer unit may include one of the following: voltage value, current value, voltage change rate, current change rate, instantaneous power, and average power of the aforementioned switch in the DC transformer unit. When the inductance attenuation parameter of the aforementioned inductor L11 or any switch in the aforementioned DC transformer unit exceeds a preset threshold, the control circuit can control the stationary contact of the single-pole double-throw controllable switch to conduct with the first moving contact to increase the equivalent inductance of the aforementioned first adjustable inductor component. Optionally, the control circuit can also control the stationary contact of the single-pole double-throw controllable switch to conduct with the second moving contact when the inductance attenuation parameter of either inductor L11 or any switching transistor in the DC transformer unit recovers to below a preset threshold. The switching power supply detects the inductance attenuation parameter of either inductor L11 or any switching transistor in the DC transformer unit through the control circuit to determine whether inductor L11 has experienced inductance attenuation. When the inductance of inductor L11 attenuates, inductor L12 replaces inductor L11 in the current-carrying circuit of the switching power supply, thereby improving the equivalent inductance of the first adjustable inductor component, avoiding inductance attenuation of the power inductor in the switching power supply under transient overcurrent conditions, and enhancing the stability and safety of the switching power supply operation under overcurrent conditions.

[0058] In some feasible implementations, the inverter unit may include at least one DC / AC conversion circuit. Each DC / AC conversion circuit is coupled to the AC power grid via a second adjustable inductor assembly, and the AC output phase of each DC / AC conversion circuit to the AC power grid is different. The second adjustable inductor assembly may include at least one first inductor and at least one second inductor, and the AC terminal of any DC / AC conversion circuit is coupled to a first inductor and a second inductor connected in series. Please also refer to... Figure 9 , Figure 9 This is another structural schematic diagram of the switching power supply provided in this application. For example... Figure 9 As shown, Figure 9 The inverter unit may include DC / AC conversion circuit A, DC / AC conversion circuit B, and DC / AC conversion circuit C. Taking DC / AC conversion circuit A as an example, the second adjustable inductor component coupled to the AC terminal of DC / AC conversion circuit A includes a first inductor (referred to as inductor L21 for convenience) and a second inductor (referred to as inductor L22 for convenience) connected in series. A controllable switch is connected in parallel to each of inductors L21 and L22. The control circuit in the switching power supply (…) Figure 9(Not shown in the diagram) When the inductance attenuation parameter of the aforementioned DC / AC converter circuit A exceeds a preset threshold, the control circuit can determine that the switching power supply has experienced overcurrent or overvoltage, i.e., the inductance of the current inductor L21 has decreased. Here, the inductance attenuation parameter of the aforementioned DC / AC converter circuit A may include the inductance attenuation parameter of inductor L21 or the inductance attenuation parameter corresponding to any switching transistor in the DC / AC converter circuit A. The inductance attenuation parameter of inductor L21 may include one of the following: voltage value, current value, voltage change rate, current change rate, instantaneous power, and average power of inductor L21. For example, the inductance attenuation parameter of inductor L21 may be the current value of inductor L21. The control circuit can determine that the switching power supply has experienced overcurrent or overvoltage when it detects that the current value of inductor L21 exceeds the preset threshold. Optionally, the control circuit can also determine that the switching power supply has experienced overcurrent or overvoltage when the inductance attenuation parameter corresponding to any switch in the DC / AC converter circuit A exceeds a preset threshold. The inductance attenuation parameter corresponding to any switch in the DC / AC converter circuit A can include one of the following: voltage value, current value, voltage change rate, current change rate, instantaneous power, and average power. When the inductance attenuation parameter of inductor L21 or any switch in the DC / AC converter circuit A exceeds the preset threshold, the control circuit can control the controllable switch connected in parallel with inductor L21 to turn off and control the controllable switch connected in parallel with inductor L22 to turn on, thereby increasing the equivalent inductance of the second adjustable inductor component. Optionally, the control circuit can also control the controllable switch connected in parallel with inductor L21 to turn on and control the controllable switch connected in parallel with inductor L22 to turn off when the inductance attenuation parameter of inductor L21 or any switch in the DC / AC converter circuit A recovers to below the preset threshold. The switching power supply uses a control circuit to detect the inductance decay parameter of inductor L21 or any of the switching transistors in the aforementioned inverter transformer unit to determine whether inductor L21 has experienced inductance decay. When the inductance of inductor L21 decays, the controllable switch connecting inductors L21 and L22 in parallel is controlled to connect inductor L22 to the current-carrying circuit of the switching power supply. This improves the equivalent inductance of the second adjustable inductor component, avoids inductance decay of the power inductor in the switching power supply under transient overcurrent conditions, and enhances the stability and safety of the switching power supply under overcurrent conditions.

[0059] For some feasible implementation methods, please refer to Figure 10 , Figure 10 This is another structural schematic diagram of the switching power supply provided in this application. For example... Figure 10 As shown, Figure 10The inverter unit may include DC / AC conversion circuit A, DC / AC conversion circuit B, and DC / AC conversion circuit C. Taking DC / AC conversion circuit A as an example, the second adjustable inductor component coupled to the AC terminal of DC / AC conversion circuit A includes a first inductor (which can be represented as inductor L21 for convenience) and a second inductor (which can be represented as inductor L22 for convenience) connected in series, and a controllable switch is connected in parallel with inductor L22. The control circuit in the switching power supply ( Figure 10 (Not shown in the diagram) When the inductance attenuation parameter of inductor L21 exceeds a preset threshold, the control circuit can determine that the switching power supply has experienced overcurrent or overvoltage, i.e., the inductance of inductor L21 has decreased. Here, the inductance attenuation parameter of inductor L21 can include one of the following: voltage value, current value, voltage change rate, current change rate, instantaneous power, and average power of inductor L21. Optionally, the control circuit can also determine that the switching power supply has experienced overcurrent or overvoltage when the inductance attenuation parameter corresponding to any switch in the DC / AC converter circuit A exceeds a preset threshold. The inductance attenuation parameter corresponding to any switch in the DC / AC converter circuit A can include one of the following: voltage value, current value, voltage change rate, current change rate, instantaneous power, and average power of any switch in the DC / AC converter circuit A. When the inductance attenuation parameter of inductor L21 or any switch in the DC / AC converter circuit A exceeds a preset threshold, the control circuit can control the controllable switch connected in parallel with inductor L22 to conduct, thereby increasing the equivalent inductance of the second adjustable inductor component. Optionally, the control circuit can also control the controllable switch connected in parallel with inductor L22 to turn off when the inductance attenuation parameter of either inductor L21 or any switching transistor in the DC / AC conversion circuit A recovers to below a preset threshold. The switching power supply detects the inductance attenuation parameter of either inductor L21 or any switching transistor in the inverter transformer unit through the control circuit to determine whether inductor L21 has experienced inductance attenuation. When the inductance of inductor L21 attenuates, the controllable switch connected in parallel with inductor L22 is controlled to connect inductor L22 to the current-carrying circuit of the switching power supply. This improves the equivalent inductance of the second adjustable inductor component, avoids inductance attenuation of the power inductor in the switching power supply under transient overcurrent conditions, and enhances the stability and safety of the switching power supply operation under overcurrent conditions.

[0060] For some feasible implementation methods, please refer to Figure 11 , Figure 11 This is another structural schematic diagram of the switching power supply provided in this application. For example... Figure 11 As shown, Figure 11The inverter unit may include DC / AC conversion circuit A, DC / AC conversion circuit B, and DC / AC conversion circuit C. Taking DC / AC conversion circuit A as an example, the second adjustable inductor component coupled to the AC terminal of DC / AC conversion circuit A includes the first ends of inductor L21 (which can be referred to as inductor L21 for convenience) and inductor L22 (which can be referred to as inductor L22 for convenience) connected in parallel as one end of the second adjustable inductor component (which may be the end connected to the AC terminal of DC / AC conversion circuit A). The second ends of inductor L21 and inductor L22 are respectively connected to the first moving contact and the second moving contact of a single-pole double-throw controllable switch. The stationary contact of the single-pole double-throw controllable switch serves as the other end of the second adjustable inductor component (which may be the end coupled to the AC mains). The control circuit in the switching power supply ( Figure 11 (Not shown in the diagram) When the inductance attenuation parameter of the aforementioned inductor L21 exceeds a preset threshold, the control circuit can determine that the switching power supply has experienced overcurrent or overvoltage, i.e., the inductance of the current inductor L21 has decreased. Here, the inductance attenuation parameter of the aforementioned inductor L21 can include one of the following: voltage value, current value, voltage change rate, current change rate, instantaneous power, and average power of the aforementioned inductor L21. Optionally, the control circuit can also determine that the switching power supply has experienced overcurrent or overvoltage when the inductance attenuation parameter corresponding to any switch transistor in the aforementioned DC / AC converter circuit A exceeds a preset threshold. The inductance attenuation parameter corresponding to any switch transistor can include one of the following: voltage value, current value, voltage change rate, current change rate, instantaneous power, and average power of any switch transistor in the DC / AC converter circuit A. When the inductance attenuation parameter of the aforementioned inductor L21 or any switch transistor in the aforementioned DC / AC converter circuit A exceeds a preset threshold, the control circuit can control the stationary contact of the single-pole double-throw controllable switch to conduct with the second moving contact, thereby increasing the equivalent inductance of the second adjustable inductor component. The switching power supply detects the inductance decay parameter of inductor L21 or any of the switching transistors in the inverter transformer unit through the control circuit to determine whether inductor L21 has experienced inductance decay. When the inductance of inductor L21 decays, inductor L22 replaces inductor L21 in the current-carrying circuit of the switching power supply, thereby improving the equivalent inductance of the second adjustable inductor component, avoiding inductance decay of the power inductor in the switching power supply under transient overcurrent conditions, and enhancing the stability and safety of the switching power supply under overcurrent conditions.

[0061] For some feasible implementation methods, please refer to Figure 12 , Figure 12 This is another structural schematic diagram of the switching power supply provided in this application. For example... Figure 12 As shown, Figure 12The inverter unit may include DC / AC conversion circuit A, DC / AC conversion circuit B, and DC / AC conversion circuit C. Taking DC / AC conversion circuit A as an example, the second adjustable inductor component coupled to the AC terminal of DC / AC conversion circuit A includes a first inductor (referred to as inductor L21 for convenience) and a second inductor (referred to as inductor L22 for convenience) connected in series. The first end of inductor L21 is connected to the first moving contact of a single-pole double-throw controllable switch, the second end of inductor L21 is connected to the first end of inductor L22, the second end of inductor L22 is connected to the second moving contact of the single-pole double-throw controllable switch, and the connection end of inductors L21 and L22 is connected to the stationary contact of the aforementioned single-pole double-throw controllable switch. The control circuit in the switching power supply ( Figure 12 (Not shown in the diagram) When the inductance attenuation parameter of the aforementioned inductor L21 exceeds a preset threshold, the control circuit can determine that the switching power supply has experienced overcurrent or overvoltage, i.e., the inductance of the current inductor L21 has decreased. Here, the inductance attenuation parameter of the aforementioned inductor L21 may include one of the following: voltage value, current value, voltage change rate, current change rate, instantaneous power, and average power of the aforementioned inductor L21. Optionally, the control circuit can also determine that the switching power supply has experienced overcurrent or overvoltage when the inductance attenuation parameter corresponding to any switch transistor in the aforementioned DC / AC converter circuit A exceeds a preset threshold. The inductance attenuation parameter corresponding to any switch transistor may include one of the following: voltage value, current value, voltage change rate, current change rate, instantaneous power, and average power of any switch transistor in the DC / AC converter circuit A. When the inductance attenuation parameter of the aforementioned inductor L21 or any switch transistor in the aforementioned DC / AC converter circuit A exceeds a preset threshold, the control circuit can control the stationary contact of the single-pole double-throw controllable switch associated with the DC / AC converter circuit A to conduct with the first moving contact, thereby increasing the equivalent inductance of the aforementioned second adjustable inductor component. The switching power supply detects the inductance decay parameter of inductor L21 or any of the switching transistors in the inverter transformer unit through the control circuit to determine whether inductor L21 has experienced inductance decay. When the inductance of inductor L21 decays, inductor L22 replaces inductor L21 in the current-carrying circuit of the switching power supply, thereby improving the equivalent inductance of the second adjustable inductor component, avoiding inductance decay of the power inductor in the switching power supply under transient overcurrent conditions, and enhancing the stability and safety of the switching power supply under overcurrent conditions.

[0062] For some feasible implementation methods, please refer to Figure 13 , Figure 13 This is another structural schematic diagram of the switching power supply provided in this application. For example... Figure 13 As shown, Figure 13The switching power supply includes a first adjustable inductor assembly, which includes inductors L11 and L12. The first ends of inductors L11 and L12 are connected in parallel to form one end of the first adjustable inductor assembly (which may be the end connected to the DC power supply output). The second ends of inductors L11 and L12 are respectively connected to the first moving contact and the second moving contact of a single-pole double-throw controllable switch. The stationary contact of the single-pole double-throw controllable switch serves as the other end of the first adjustable inductor assembly (which may be the end coupled to the first DC terminal of the DC transformer unit). The inverter unit includes DC / AC conversion circuit A, DC / AC conversion circuit B, and DC / AC conversion circuit C. Each DC / AC conversion circuit is coupled to a second adjustable inductor assembly. Taking DC / AC conversion circuit A as an example, the second adjustable inductor assembly associated with DC / AC conversion circuit A includes inductors L21 and L22. Inductors L21 and L22 are each connected in parallel to a controllable switch. The control circuit in the switching power supply ( Figure 13 (Not shown) When the inductance attenuation parameter of inductor L11 in the first adjustable inductor assembly or any switch in the DC-DC transformer unit exceeds a preset threshold, the controllable switch in the first adjustable inductor assembly can be controlled to increase the equivalent inductance of the first adjustable inductor assembly. The control circuit can also control the controllable switch of the second adjustable inductor assembly associated with any DC / AC conversion circuit in the inverter unit when the inductance attenuation parameter of any switch in any DC / AC conversion circuit exceeds a preset threshold, thereby increasing the equivalent inductance of the corresponding second adjustable inductor assembly. This avoids inductance attenuation of the power inductor in the switching power supply under transient overcurrent conditions, enhancing the stability and safety of the switching power supply under overcurrent conditions. Here, the process of the control circuit controlling the controllable switch in the first adjustable inductor assembly and controlling the controllable switch in the second adjustable inductor assembly can be referred to the above... Figures 5 to 12 The description of the switching power supply shown is omitted here.

[0063] For some feasible implementation methods, please refer to Figure 14 , Figure 14 This is another structural schematic diagram of the switching power supply provided in this application. For example... Figure 14As shown, the DC-DC converter unit of the switching power supply consists of switching transistors Q1 and Q2 (each switching transistor can be a metal-oxide-semiconductor field-effect transistor (MOSFET)). The second terminal of Q1 is connected to the first terminal of Q2. The inverter unit of the switching power supply includes three DC / AC conversion circuits connected in parallel. Each DC / AC conversion circuit includes a first and a second switching transistor connected in series, as well as a third and a fourth switching transistor connected in series. The second switching transistor is connected to the third switching transistor. The connection terminals of the first and second switching transistors, and the connection terminals of the third and fourth switching transistors, are each connected to the output terminal of the DC / AC conversion circuit through a separate switching transistor. Here, in DC / AC converter circuit A, the first to sixth switching transistors can be switching transistors Qa1, Qa2, Qa3, Qa4, Qa5, and Qa6; in DC / AC converter circuit B, the first to sixth switching transistors can be Qb1, Qb2, Qb3, Qb4, Qb5, and Qb6; DC / AC converter circuit B also includes capacitor C3; and in DC / AC converter circuit C, the first to sixth switching transistors can be Qc1, Qc2, Qc3, Qc4, Qc5, and Qc6. The second connection terminal of Qa1 is connected to the first connection terminal of Qa2, the second connection terminal of Qa3 is connected to the first connection terminal of Qa4, and the second connection terminal of Qa5 is connected to the first connection terminal of Qa6. The connection terminals of Qa1 and Qa2 are connected through the connection terminals of Qa5, Qa6, and Qa3 to Qa4. The second terminal of Qb1 is connected to the first terminal of Qb2, the second terminal of Qb3 is connected to the first terminal of Qb4, and the second terminal of Qb5 is connected to the first terminal of Qb6. The terminals of Qb1 and Qb2 are connected to the terminals of Qb4 through Qb5, Qb6, and Qb3. Capacitor C3 is connected in parallel with Qb6. The second terminal of Qc1 is connected to the first terminal of Qc2, the second terminal of Qc3 is connected to the first terminal of Qc4, and the second terminal of Qc5 ​​is connected to the first terminal of Qc6. The terminals of Qc1 and Qc2 are connected to the terminals of Qc4 through Qc5, Qc6, and Qc3. The switching power supply also includes capacitors C1 and C2. The second terminal of capacitor C1 is connected to the first terminal of capacitor C2, and this connection terminal is also connected to the connection terminals of Qa2 and Qa3, Qb2 and Qb3, and Qc1 and Qc2. The first terminal of capacitor C1 is connected to the first terminals of switching transistors Q1, Qa1, Qb1, and Qc1. The second terminal of capacitor C2 is connected to the second terminals of switching transistors Q2, Qa4, Qb4, and Qc4. Optionally, the aforementioned switching transistors can also be insulated-gate bipolar transistors (IGBTs).Understandably, if each switching transistor is a metal-oxide-semiconductor field-effect transistor (MOSFET), then the first connection terminal of each switching transistor can be the drain, and the second connection terminal can be the source. If each switching transistor is an insulated-gate bipolar transistor (IGBT), then the first connection terminal of each switching transistor can be the emitter, and the second connection terminal can be the collector. In other words, the first and second connection terminals of each switching transistor can be determined according to the specific device type, and are not limited here. The connection terminals of Qa1 and Qa2 are connected to the first adjustable inductor assembly, and the connection terminals of Qa5 and Qa6, Qb5 and Qb6, and Qc5 and Qc6 are respectively connected to the second adjustable inductor assembly.

[0064] In some feasible implementations, in the above Figure 14 In the switching power supply shown, the first adjustable inductor component in the switching power supply can be composed of the above-mentioned... Figure 5 , Figure 6 , Figure 7 or Figure 8 The first adjustable inductor component in the switching power supply provided herein, and the second adjustable inductor component in the switching power supply may be one of the above-mentioned components. Figure 9 , Figure 10 , Figure 11 or Figure 12 One type of second adjustable inductor component in the switching power supply provided herein. The control circuit in the switching power supply ( Figure 14 (Not shown) When the inductance attenuation parameter of the first inductor in the first adjustable inductor assembly or any switch (e.g., switch Q1, switch Q2) in the DC-DC transformer unit exceeds a preset threshold, the controllable switch in the first adjustable inductor assembly can be controlled to increase the equivalent inductance of the first adjustable inductor assembly. The control circuit can also control the controllable switch of the second adjustable inductor assembly associated with any DC / AC conversion circuit in the inverter unit, or any switch (e.g., switches Qa1, Qa2, Qa3, Qa4, Qa5, and Qa6 in DC / AC conversion circuit A) when the inductance attenuation parameter exceeds a preset threshold, to increase the equivalent inductance of the corresponding second adjustable inductor assembly. This avoids inductance attenuation of the power inductor in the switching power supply under transient overcurrent conditions, enhancing the stability and safety of the switching power supply operation under overcurrent conditions. Here, the process by which the control circuit controls the controllable switch in the first adjustable inductor assembly and the controllable switch in the second adjustable inductor assembly can be referred to the above description. Figures 5 to 12 The description of the switching power supply shown is omitted here.

[0065] For some feasible implementation methods, please refer to Figure 15a , Figure 15a This is a schematic diagram of the controllable switch provided in this application. Figure 15aAs shown, the controllable switch includes a single-gate switch S0, a thyristor J0, a variable resistor R0, a capacitor C0, and switching transistors K1 and K2. Thyristor J0 and variable resistor R0 are connected in series, capacitor C0 and variable resistor R0 are connected in parallel, and the drains of switching transistors K1 and K2 are connected together. The single-gate switch S0 is connected in parallel with the series-connected thyristor J0 and variable resistor R0, and the series-connected switching transistors K1 and K2. Please refer to [further details omitted]. Figure 15b , Figure 15b This is another structural schematic diagram of the controllable switch provided in this application. For example... Figure 15b As shown, the controllable switch includes a single-gate switch S1, a thyristor J1, a variable resistor R1, a switching transistor K1, and a switching transistor K2. Thyristor J1 and variable resistor R1 are connected in series, and the drains of switching transistor K3 and K4 are connected together. The single-gate switch S1 is connected in parallel with the series-connected thyristor J1 and variable resistor R1, and the series-connected switching transistors K3 and K4. Please refer to [further details omitted]. Figure 15c , Figure 15c This is another structural schematic diagram of the controllable switch provided in this application. For example... Figure 15c As shown, the controllable switch includes switching transistors K5, K6, and K7, wherein the source of switching transistor K6 is connected to the source of switching transistor K5 and the source of switching transistor K7, respectively.

Claims

1. A switching power supply, characterized in that, The switching power supply includes a control circuit, a DC transformer unit, an inverter unit, and at least one adjustable inductor component. The first terminal of the at least one adjustable inductor component is coupled to the output terminal of the DC power supply or the AC terminal of the inverter unit. The second terminal of the at least one adjustable inductor component is coupled to the first DC terminal of the DC transformer unit or the AC mains. The second DC terminal of the DC transformer unit is coupled to the DC terminal of the inverter unit. The adjustable inductor component includes multiple inductors and at least one controllable switch. The control circuit is used to control the controllable switch in any of the adjustable inductor components to turn on or off, so as to control the equivalent inductance value of any of the adjustable inductor components. The control circuit is used to control the equivalent inductance of the adjustable inductor component to increase when the inductance attenuation parameter of the inductor in the adjustable inductor component is greater than a preset threshold.

2. The switching power supply according to claim 1, characterized in that, The at least one adjustable inductor component includes a first adjustable inductor component, the first end of the first adjustable inductor component is coupled to the output terminal of the DC power supply, and the second end of the first adjustable inductor component is coupled to the first DC terminal of the DC transformer unit.

3. The switching power supply according to claim 2, characterized in that, The inverter unit includes at least one DC / AC conversion circuit, and the at least one adjustable inductor component includes at least one second adjustable inductor component. One of the at least one DC / AC conversion circuits is coupled to the AC power grid through one of the at least one second adjustable inductor component.

4. The switching power supply according to claim 1, characterized in that, The inverter unit includes at least one DC / AC conversion circuit. The at least one adjustable inductor component includes a first adjustable inductor component and at least one second adjustable inductor component. The first end of the first adjustable inductor component is coupled to the output end of the DC power supply, and the second end of the first adjustable inductor component is coupled to the first DC end of the DC transformer unit. One of the at least one DC / AC conversion circuits is coupled to the AC power grid through one of the at least one second adjustable inductor component.

5. The switching power supply according to claim 2 or 4, characterized in that, The control circuit is also used to control the equivalent inductance of the first adjustable inductor component to increase when the inductance attenuation parameter of any switching transistor in the DC transformer unit is greater than a preset threshold.

6. The switching power supply according to claim 3 or 4, characterized in that, The control circuit is also used to control the equivalent inductance of the second adjustable inductor component to increase when the inductance attenuation parameter of any switch in the inverter unit is greater than a preset threshold.

7. The switching power supply according to claim 3 or 4, characterized in that, The first adjustable inductor assembly or the second adjustable inductor assembly includes a first inductor and at least one second inductor, the first inductor and the second inductor are connected in series, the first inductor is connected in parallel with a first controllable switch, and one second inductor is connected in parallel with one second controllable switch; The control circuit is used to control the first controllable switch to turn off and control at least one of the second controllable switches to turn on, so as to control the equivalent inductance of the first adjustable inductor component or the second adjustable inductor component to increase.

8. The switching power supply according to claim 3 or 4, characterized in that, The first adjustable inductor assembly or the second adjustable inductor assembly includes a first inductor and at least one second inductor, wherein the first inductor and the second inductor are connected in series, and one second inductor is connected in parallel with a controllable switch; The control circuit is used to control the conduction of one or more of the controllable switches connected in parallel with each of the second inductors, so as to control the equivalent inductance value of the first adjustable inductor component or the second adjustable inductor component to increase.

9. The switching power supply according to claim 3 or 4, characterized in that, The first adjustable inductor assembly or the second adjustable inductor assembly includes a first inductor, a second inductor, and a single-pole double-throw controllable switch. The first end of the first inductor and the first end of the second inductor are connected in parallel to serve as one end of the first adjustable inductor assembly or the second adjustable inductor assembly. The second ends of the first inductor and the second inductor are respectively connected to the first moving contact and the second moving contact of the single-pole double-throw controllable switch. The stationary contact of the single-pole double-throw controllable switch serves as the other end of the first adjustable inductor assembly or the second adjustable inductor assembly. The control circuit is used to control the stationary contact of the single-pole double-throw controllable switch to conduct with the second moving contact in order to increase the equivalent inductance of the first adjustable inductor component or the second adjustable inductor component.

10. The switching power supply according to claim 3 or 4, characterized in that, The first adjustable inductor assembly or the second adjustable inductor assembly includes a first inductor, a second inductor, and a single-pole double-throw controllable switch. The first inductor and the second inductor are connected in series. The first end of the first inductor is connected to the first moving contact of the single-pole double-throw controllable switch. The second end of the first inductor is connected to the first end of the second inductor. The second end of the second inductor is connected to the second moving contact of the single-pole double-throw controllable switch. The connection end of the first inductor and the second inductor is connected to the stationary contact of the single-pole double-throw controllable switch. The control circuit is used to control the stationary contact of the single-pole double-throw controllable switch to conduct with the first moving contact in order to increase the equivalent inductance of the first adjustable inductor component or the second adjustable inductor component.

11. The switching power supply according to any one of claims 1-4, characterized in that, The inductance attenuation parameter includes one of the following: voltage value, current value, voltage change rate, current change rate, instantaneous power, and average power.

12. The switching power supply according to any one of claims 1-4, characterized in that, The DC transformer unit includes two switching transistors connected in series, and the connection terminal of the two switching transistors serves as the first DC terminal of the DC transformer unit. The inverter unit includes three DC / AC conversion circuits connected in parallel. Each DC / AC conversion circuit includes a first switch and a second switch connected in series, as well as a third switch and a fourth switch connected in series. The second switch is connected to the third switch. The connection terminals of the first switch and the second switch, and the connection terminals of the third switch and the fourth switch are respectively connected to the output terminal of the DC / AC conversion circuit through a switch.

13. An adjustable inductor assembly, characterized in that, The adjustable inductor assembly is used in a switching power supply, which includes a DC transformer unit and an inverter unit. The first end of the adjustable inductor assembly is coupled to the output terminal of the DC power supply or the AC terminal of the inverter unit. The second end of the adjustable inductor assembly is coupled to the first DC terminal of the DC transformer unit or the AC mains. The second DC terminal of the DC transformer unit is coupled to the DC terminal of the inverter unit. The adjustable inductor assembly includes multiple inductors and at least one controllable switch. The adjustable inductor component is used to control the equivalent inductance value of the adjustable inductor component by turning it on or off through the at least one controllable switch. The adjustable inductor component is used to control the equivalent inductance of the adjustable inductor component to increase when the inductance attenuation parameter of the inductor in the adjustable inductor component is greater than a preset threshold.

14. The adjustable inductor assembly according to claim 13, characterized in that, The adjustable inductor assembly includes a first inductor and at least one second inductor, the first inductor and the second inductor are connected in series, the first inductor is connected in parallel with a first controllable switch, and one second inductor is connected in parallel with one second controllable switch; The adjustable inductor component is used to control the equivalent inductance of the adjustable inductor component to increase when the inductance attenuation parameter of the inductor in the adjustable inductor component, or the inductance attenuation parameter of any switch in the inverter unit and the DC transformer unit, is greater than a preset threshold by turning off the first controllable switch and turning on at least one second controllable switch.

15. The adjustable inductor assembly according to claim 13, characterized in that, The adjustable inductor assembly includes a first inductor and at least one second inductor, wherein the first inductor and the second inductor are connected in series, and one second inductor is connected in parallel with a controllable switch. The adjustable inductor assembly is used to control the increase of the equivalent inductance of the adjustable inductor assembly when the inductance attenuation parameter of the inductor in the adjustable inductor assembly, or the inductance attenuation parameter of any switch in the inverter unit and the DC transformer unit, is greater than a preset threshold by turning on one or more of the controllable switches connected in parallel with each of the second inductors.

16. The adjustable inductor assembly according to claim 13, characterized in that, The adjustable inductor assembly includes a first inductor, a second inductor, and a single-pole double-throw controllable switch. The first end of the first inductor and the first end of the second inductor are connected in parallel to form one end of the adjustable inductor assembly. The second ends of the first inductor and the second inductor are respectively connected to the first moving contact and the second moving contact of the single-pole double-throw controllable switch. The stationary contact of the single-pole double-throw controllable switch forms the other end of the adjustable inductor assembly. The adjustable inductor assembly is used to control the increase of the equivalent inductance of the adjustable inductor assembly when the inductance attenuation parameter of the inductor in the adjustable inductor assembly, or the inductance attenuation parameter of any switching tube in the inverter unit and the DC transformer unit, is greater than a preset threshold. This is achieved by connecting the stationary contact and the second moving contact of the single-pole double-throw controllable switch.

17. The adjustable inductor assembly according to claim 13, characterized in that, The adjustable inductor assembly includes a first inductor, a second inductor, and a single-pole double-throw controllable switch. The first inductor and the second inductor are connected in series. The first end of the first inductor is connected to the first moving contact of the single-pole double-throw controllable switch. The second end of the first inductor is connected to the first end of the second inductor. The second end of the second inductor is connected to the second moving contact of the single-pole double-throw controllable switch. The connection end of the first inductor and the second inductor is connected to the stationary contact of the single-pole double-throw controllable switch. The adjustable inductor component is used to control the increase of the equivalent inductance of the adjustable inductor component when the inductance attenuation parameter of the inductor in the adjustable inductor component, or the inductance attenuation parameter of any switch in the inverter unit and the DC transformer unit, is greater than a preset threshold. This is achieved by connecting the stationary contact of the single-pole double-throw controllable switch with the first moving contact.

18. The adjustable inductor assembly according to any one of claims 14-17, characterized in that, The inductance attenuation parameter includes one of the following: voltage value, current value, voltage change rate, current change rate, instantaneous power, and average power.

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