Switching power supply, control method of switching power supply and power distribution system

Abstract

The invention provides a switching power supply, a control method thereof and a power distribution system. The switching power supply comprises a first power conversion circuit, a second power conversion circuit and a controller, the first power conversion circuit is used for converting electric energy provided by a power grid into first current and outputting the first current to an output bus, and the second power conversion circuit is used for converting electric energy provided by an energy storage device into second current and outputting the second current to the output bus. The controller is coupled to the first power conversion circuit and the second power conversion circuit, and the controller is used for controlling a first current output by the first power conversion circuit and a second current output by the second power conversion circuit according to a target current, the target current is an expected current for suppressing the power fluctuation of the input bus caused by the power fluctuation of the load. The switching power supply can restrain power fluctuation of a power grid side caused by power fluctuation of a load side so as to protect power supply and distribution facilities and improve the utilization rate of electric energy.

Description

Technical Field

[0001] This application relates to the field of power electronics, and more particularly to a switching power supply, a control method for the switching power supply, and a power distribution system. Background Technology

[0002] Power distribution systems typically integrate switching power supplies between the power grid and the load. These supplies convert the AC or DC voltage from the grid to the required AC or DC voltage for the load and distribute it to meet its operational needs. The actual power output of the load during operation often fluctuates dynamically. For example, when power switching occurs on the load side, the current demand may surge or plummet. When this sudden change in current demand is fed back to the grid, it causes power fluctuations on the grid side. In other words, load-side power fluctuations can lead to fluctuations in the input power of the switching power supply. These fluctuating power outputs not only degrade power quality but also reduce the performance and lifespan of power supply and distribution facilities.

[0003] To avoid damage to power distribution facilities caused by overload due to power fluctuations, existing technologies typically distribute power according to peak power levels to suppress these fluctuations. However, derating power distribution based on peak power levels leads to a waste of power distribution infrastructure and capacity, failing to maximize the utilization of electrical energy. Summary of the Invention

[0004] This application provides a switching power supply that synchronously controls a first power conversion circuit to provide a first current to the output bus based on a target current, and a second current to the output bus provided by an energy storage device through a second power conversion circuit. This satisfies the current demand during power fluctuations on the load side, thereby suppressing power fluctuations on the input bus. This application also provides a control method and power distribution system for the switching power supply. Specifically, this application includes the following technical solutions:

[0005] In a first aspect, this application provides a switching power supply, including a first power conversion circuit, a second power conversion circuit, and a controller. The first power conversion circuit is coupled to the power grid via an input bus and to a load via an output bus. The first power conversion circuit is used to convert electrical energy provided by the power grid into a first current and output it to the output bus. The second power conversion circuit is coupled to an energy storage device and to the load via an output bus. The second power conversion circuit is used to convert electrical energy provided by the energy storage device into a second current and output it to the output bus. The controller is coupled to the first power conversion circuit and the second power conversion circuit. The controller is used to control the first current output by the first power conversion circuit and the second current output by the second power conversion circuit according to a target current, wherein the target current is a desired current used to suppress power fluctuations on the input bus caused by power fluctuations of the load.

[0006] The controller of the switching power supply in this application is electrically connected to both a first power conversion circuit and a second power conversion circuit, enabling it to control the first current input from the first power conversion circuit to the output bus and the second current input from the second power conversion circuit to the output bus, respectively. The controller controls the first and second currents based on a target current. The target current is used to suppress power fluctuations on the input bus caused by load-side power fluctuations; the target current can be understood as the desired current that can suppress power fluctuations on the input bus. The controller synchronously controls the magnitude of the first current provided by the first power conversion circuit and the magnitude of the second current flowing through the energy storage device to the second power conversion circuit, based on the magnitude of the target current, thus achieving a coordinated control effect and meeting the target current demand during input bus power fluctuations. This application suppresses power fluctuations in the input bus caused by load-side power fluctuations by controlling the first and second currents based on the target current. This improves the efficiency, response rate, and accuracy of the switching power supply in suppressing input bus fluctuations. While effectively suppressing power fluctuations in the input bus, it also avoids energy waste, improves energy utilization efficiency, and consequently enhances the performance and lifespan of power distribution facilities. It prevents damage to power distribution facilities due to overload caused by power fluctuations in the input or output bus. Furthermore, compared to methods like derating or using redundant switching power supplies to prevent overload, this application's switching power supply stores energy in an energy storage device. When power fluctuations occur in the input or output bus, a second current is input to the output bus via a second power conversion circuit to charge it. The coordination between the first and second currents ensures that the output bus current meets the target current requirement, thus suppressing input bus power fluctuations. This prevents waste of power distribution facilities and power capacity, and reduces power distribution costs. In addition, by controlling the first and second currents based on the target current to suppress power fluctuations, the internal structure design of the switching power supply can be simplified, the overall structural volume of the switching power supply can be reduced, the power supply and distribution interface can be simplified, and material costs can be saved.

[0007] In one implementation, a controller is configured to control a first current output by a first power conversion circuit based on a first reference current value, and to control a second current based on a second reference current value, wherein the sum of the first and second reference current values ​​is equal to a target current value.

[0008] In this implementation, the controller determines the first reference current value that the first power conversion circuit needs to provide and the second reference current value that the energy storage device needs to provide to the output bus through the second power conversion current based on the target current. The sum of the first reference current value and the second reference current value is equal to the target current value. This allows the controller to allocate the magnitude of the first reference current value and the second reference current value according to the target current. As a result, when the controller controls the first current based on the first reference current value and controls the second current based on the second reference current value, it achieves the effect of allocating the first current and the second current, thereby improving the accuracy of current change regulation.

[0009] In one implementation, the first reference current value is less than or equal to the current value of the maximum rated current of the first power conversion circuit.

[0010] In this implementation, a portion of the target current is provided by the first power conversion circuit, and another portion is provided by the energy storage device. This ensures that if the current provided by the first power conversion circuit is insufficient to meet the target current, the remaining current is compensated by the energy storage device, thereby guaranteeing that the target current can suppress power fluctuations at the input bus. Simultaneously, by setting the first reference current value to be less than or equal to the maximum rated current value of the first power conversion circuit, protection can be provided to the first power conversion circuit, preventing overload and damage to its internal components, thus improving the circuit's performance and lifespan.

[0011] In one implementation, a first power conversion circuit includes a first power switch, a second power conversion circuit includes a second power switch, and a controller is used to control the current value of a first current to be equal to a first reference current value by adjusting the duty cycle of the first power switch, and to control the current value of a second current to be equal to a second reference current value by adjusting the duty cycle of the second power switch.

[0012] In this implementation, the duty cycle of the first power switch is controlled so that the value of the first current is equal to the value of the first reference current, and the duty cycle of the second power switch is controlled so that the value of the second current is equal to the value of the second reference current. This brings the values ​​of the first and second currents close to the target current, satisfying the current requirements and accuracy needed to suppress power fluctuations at the input bus. Furthermore, adjusting the current magnitude by controlling the duty cycle of the power switches reduces the difficulty of adjusting the current and improves accuracy and response speed.

[0013] In one implementation, the switching power supply further includes a current detection unit for acquiring a detected current value of a first current and a detected current value of a second current and providing them to a controller. The controller is used to adjust the duty cycle of a first power switch based on the detected current value of the first current and to adjust the duty cycle of a second power switch based on the detected current value of the second current.

[0014] In this implementation, a first current is detected and provided to the controller. Based on this detected value, the controller continuously adjusts the duty cycle of the first power switch, gradually bringing the first current value closer to a first reference current value. Simultaneously, a second current is detected and provided to the controller. Based on this second current, the controller continuously adjusts the duty cycle of the second power switch, gradually bringing the second current value closer to a second reference current value. It is understandable that by acquiring the current detection values ​​of the first and second currents in real time and continuously adjusting the duty cycle of the power switch so that the sum of the first and second currents gradually approaches the target current, power fluctuations in the input bus are gradually suppressed, thus stabilizing the power of the input bus and improving the protection of power supply and distribution facilities.

[0015] In one implementation, the switching power supply further includes a voltage detection unit, which is used to acquire the detection voltage of the input bus and provide it to the controller. The controller is used to determine the current value of the target current based on the voltage value of the detection voltage of the input bus and the voltage value of the reference voltage of the input bus.

[0016] In this implementation, the input bus voltage is detected by a voltage detection unit, and the difference between the detected input bus voltage and the reference voltage is fed into a voltage closed-loop controller for calculation, such as a PID (proportion integration differentiation) controller, to obtain the target current value, thus ensuring the suppression of power fluctuations on the input bus. Simultaneously, obtaining the target current value using the difference between the detected input bus voltage and the reference voltage improves the efficiency of obtaining the target current value and enhances the suppression of power fluctuations on the input bus.

[0017] In one implementation, when the voltage value of the detected voltage of the input bus is less than or equal to the maximum rated voltage value of the first power conversion circuit, the controller controls the first current to be the target current and controls the output bus to input current to the energy storage device coupled to the second power converter through the second power conversion circuit for charging.

[0018] In this implementation, when the first current input to the output bus from the first power conversion circuit is sufficient to meet the target current requirement, the excess electrical energy in the output bus can be converted by the second power conversion circuit and input to the energy storage device for charging. It is understood that when the first current input to the output bus from the first power conversion circuit is sufficient to meet the target current requirement, charging and storing the energy in the energy storage device through the output bus ensures that the stored energy meets the next power supply demand, thereby improving the energy utilization rate of the switching power supply.

[0019] In one implementation, the switching power supply includes a power limiting circuit, which limits the maximum power of the input bus to be less than or equal to the sum of the maximum rated power of the first power conversion circuit and the maximum rated power of the second power conversion circuit.

[0020] In this implementation, by setting a power limiting circuit, the functional devices in the first power conversion circuit and the second power conversion circuit can be protected, avoiding device damage caused by overload, thereby improving the working performance and lifespan of the first power conversion circuit and the second power conversion circuit.

[0021] Secondly, this application provides a power distribution system including a switching power supply provided by any of the above implementations, wherein the switching power supply is used to receive electrical energy from the power grid and to provide electrical energy to the load.

[0022] The power distribution system of this application, by incorporating a switching power supply provided by any of the above-described implementations, can ensure a stable power output of the switching power supply when power fluctuations occur on the load side, thus protecting the power distribution facilities in the power distribution system and preventing damage to functional components due to overload caused by power fluctuations. This, in turn, improves the operating performance and lifespan of the power distribution system. Because the power distribution system of this application uses a switching power supply provided by any of the above-described implementations, it possesses all the beneficial effects that a switching power supply provided by any of the above-described implementations may have.

[0023] Thirdly, this application provides a control method for a switching power supply, including:

[0024] The detection voltage of the input bus is obtained through a voltage detection unit. The input bus is used to couple the power grid and the first power conversion circuit. The first power conversion circuit is used to output the first current to the output bus. The first power conversion circuit is coupled to the load through the output bus.

[0025] The target current is determined based on the detected voltage of the input bus and the reference voltage of the input bus. The target current is the desired current used to suppress the power fluctuations of the input bus caused by the power fluctuations of the load.

[0026] The first current output by the first power conversion circuit and the second current output by the energy storage device through the second power conversion circuit are controlled based on the target current. The energy storage device is used to store electrical energy and is coupled to the output bus through the second power conversion circuit.

[0027] In this implementation, a first current and a second current are controlled based on a target current. The target current is used to suppress power fluctuations in the input bus caused by power fluctuations on the load side. Specifically, the magnitude of the first current provided by the first power conversion circuit and the magnitude of the second current from the energy storage device through the second power conversion circuit are controlled synchronously based on the magnitude of the target current, creating a coordinated control effect between them. This ensures that the target current demand is met when the input bus power fluctuates. The switching power supply control method of this application controls the first and second currents based on the target current, suppressing power fluctuations in the input bus caused by power fluctuations on the load side by controlling the current. This improves the suppression efficiency, response rate, and accuracy of input bus power fluctuations. While suppressing power fluctuations in the input bus, it also avoids energy waste, improves energy utilization efficiency, and thus enhances the performance and lifespan of power supply and distribution facilities. It also prevents damage to power supply and distribution facilities due to overload caused by power fluctuations in the input and output buses. Meanwhile, compared to preventing power supply and distribution facilities from overload by derating configurations or using redundant switching power supplies, the switching power supply control method of this application controls the coordination between the first current and the second current to make the current of the output bus reach the target current, which can suppress the power fluctuation of the input bus, thereby avoiding the waste of power supply and distribution facilities and power capacity, and reducing power supply and distribution costs.

[0028] One implementation further includes, after determining the target current based on the detected voltage of the input bus and the reference voltage of the input bus:

[0029] Determine if the energy storage device is enabled:

[0030] If so, then the first current and the second current are controlled based on the target current respectively;

[0031] If not, the current value of the first current is equal to the current value of the target current.

[0032] In this implementation, whether the energy storage device is enabled can be understood as whether it is operational. After determining the target current based on the detected voltage and reference voltage of the input bus, it is further determined whether the energy storage device needs to operate. If the energy storage device needs to operate, the first power conversion circuit and the energy storage device work together to supply current to the output bus to meet the current requirement of the target current and thus suppress power fluctuations on the input bus. If it is determined that the energy storage device does not need to operate, that is, it does not need to charge the output bus, the first power conversion circuit provides current to the output bus independently to meet the current requirement of the target current, and the energy storage device continues to store electrical energy to provide power during the next power fluctuation. By determining whether the energy storage device is enabled in advance, the response speed and adjustment efficiency of the adjustment current in the output bus can be improved, thereby improving the power fluctuation suppression efficiency.

[0033] One implementation method includes determining whether the energy storage device is enabled, comprising:

[0034] The deep filter voltage value and shallow filter voltage value of the input bus are obtained through the sampling module. The average sampling time of the deep filter voltage value is greater than the average sampling time of the shallow filter voltage value.

[0035] Determining whether the energy storage device is enabled based on the shallow filtered voltage value:

[0036] If the shallow filter voltage value is outside the expected voltage range of the input bus, the energy storage device is enabled and outputs a second current through the second power conversion circuit. The expected voltage range of the input bus is the voltage fluctuation range when the input bus power is stable.

[0037] In this implementation, when the power of the input bus is smooth or stable, the fluctuation range of the input bus voltage can be understood as the expected voltage range of the input bus. Specifically, when the shallow-filtered voltage value of the input bus is outside the expected voltage range, it can be understood that the power fluctuation of the input bus is large, and the power fluctuation needs to be quickly suppressed. At this time, by enabling the energy storage device, the energy storage device and the first power conversion circuit work together to input current to the output bus to quickly meet the current demand of the target current, thus achieving the effect of rapidly suppressing power fluctuations and improving the power fluctuation suppression efficiency.

[0038] One implementation method includes determining whether the energy storage device is enabled, comprising:

[0039] Determining whether the energy storage device is enabled based on the deep-filtered voltage value:

[0040] If the deep filter voltage value is within the expected voltage range of the input bus, and the energy storage voltage of the energy storage device is less than the rated voltage of the energy storage device, then the energy storage device is enabled and receives the current input to the output bus through the second power conversion circuit for charging.

[0041] In this implementation, when the obtained deep-filtered voltage value is within the expected voltage range of the input bus, it can be understood that the power output of the input bus is stable at this time. Furthermore, the energy storage voltage of the energy storage device may be lower than its rated voltage, meaning that the energy stored in the energy storage device may not be saturated. Therefore, current can be input to the energy storage device through the output bus to charge it, allowing the energy storage device to store sufficient energy.

[0042] One implementation method includes determining whether the energy storage device is enabled, comprising:

[0043] Determining whether the energy storage device is enabled based on the deep-filtered voltage value:

[0044] If the deep filter voltage value is within the expected voltage range of the input bus and the first reference current value is greater than the target current value, the energy storage device is enabled and receives the current input to the output bus through the second power conversion circuit for charging.

[0045] One implementation, wherein controlling the first current and the second current based on the target current, includes:

[0046] A first reference current value and a second reference current value are determined based on the target current, wherein the sum of the first reference current value and the second reference current value is equal to the target current value;

[0047] Determine whether the first reference current value is greater than or equal to the target current value:

[0048] If so, control the first reference current value to be equal to the target current value, and control the output bus to input current to the energy storage device through the second power conversion circuit to charge it;

[0049] If not, control the value of the first current to be equal to the value of the first reference current, and control the value of the second current to be equal to the value of the second reference current.

[0050] In this implementation, if the first reference current value is greater than or equal to the target current value, it can be understood that the target current requirement can be met by the first power conversion circuit. In this case, current can be supplied to the output bus solely through the first power conversion circuit to suppress power fluctuations in the input bus. If the first reference current value is less than the target current value, it can be understood that the target current requirement cannot be met by the first power conversion circuit alone. In this case, the energy storage device needs to be enabled to input a second current to the output bus for power compensation to meet the target current requirement. Attached Figure Description

[0051] To more clearly illustrate the technical solution 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 from these drawings without creative effort.

[0052] Figure 1 This is a schematic diagram of the working scenario of the power distribution system provided in the embodiments of this application;

[0053] Figure 2 This is a schematic diagram of the planar structure of the power distribution system provided in the embodiments of this application;

[0054] Figure 3 This is a schematic diagram of the planar structure of the switching power supply for the power distribution system provided in the embodiments of this application;

[0055] Figure 4 A waveform diagram of the energy storage voltage of the energy storage device in the switching power supply provided in the embodiments of this application;

[0056] Figure 5 This is a schematic diagram of the planar structure of the switching power supply provided in an embodiment of this application;

[0057] Figure 6 This is a schematic diagram of the planar structure of the switching power supply provided in an embodiment of this application;

[0058] Figure 7 This is a schematic diagram of the planar structure of the switching power supply provided in an embodiment of this application;

[0059] Figure 8 This is a schematic diagram of the planar structure of the switching power supply provided in an embodiment of this application;

[0060] Figure 9 This is a schematic diagram of the planar structure of the switching power supply provided in an embodiment of this application;

[0061] Figure 10 This is a schematic diagram illustrating the workflow of the control method for the switching power supply provided in the embodiments of this application;

[0062] Figure 11 This is a control block diagram of a switching power supply provided in an embodiment of this application;

[0063] Figure 12 This is a schematic diagram illustrating the workflow of the control method for the switching power supply provided in the embodiments of this application;

[0064] Figure 13 This is a schematic diagram illustrating the workflow of controlling the first current and the second current based on the target current in the control method of the switching power supply provided in the embodiments of this application. Detailed Implementation

[0065] The technical solutions of the embodiments of this application will now be described with reference to the accompanying drawings. Obviously, the described embodiments are merely some, and not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection claimed in this application.

[0066] This application provides a switching power supply, including a first power conversion circuit, a second power conversion circuit, and a controller. The first power conversion circuit is coupled to the power grid via an input bus and to a load via an output bus. The first power conversion circuit converts electrical energy supplied by the power grid into a first current and outputs it to the output bus. The second power conversion circuit is coupled to an energy storage device and to the load via the output bus. The second power conversion circuit converts electrical energy supplied by the energy storage device into a second current and outputs it to the output bus. The controller is coupled to both the first and second power conversion circuits and controls the first current output by the first power conversion circuit and the second current output by the second power conversion circuit according to a target current. The target current is a desired current used to suppress power fluctuations on the input bus caused by power fluctuations on the load side. This switching power supply can suppress power fluctuations on the power grid side caused by power fluctuations on the load side, thereby protecting power distribution facilities and improving energy utilization.

[0067] This application provides a power distribution system including a switching power supply as described above. The switching power supply receives electrical energy from the power grid and supplies the electrical energy to the load. Because the power distribution system of this application incorporates the switching power supply provided above, its operating performance and lifespan can be improved.

[0068] This application provides a control method for a switching power supply, comprising: acquiring a detected voltage of an input bus via a voltage detection unit, wherein the input bus is used to couple to a power grid and a first power conversion circuit, the first power conversion circuit is used to output a first current to an output bus, and the first power conversion circuit is coupled to a load through the output bus; determining a target current based on the detected voltage of the input bus and a reference voltage of the input bus, the target current being a desired current used to suppress power fluctuations in the input bus caused by power fluctuations in the load; and controlling the first current output by the first power conversion circuit and the second current output by an energy storage device through a second power conversion circuit based on the target current, wherein the energy storage device is used to store electrical energy and is coupled to the output bus through the second power conversion circuit. The control method of this application for a switching power supply, by controlling the coordination between the first and second currents, enables the current in the output bus to reach the target current, thereby suppressing power fluctuations in the input bus, thus avoiding waste of power distribution facilities and power capacity, and reducing power distribution costs.

[0069] Please see Figure 1 , Figure 1 This is a schematic diagram illustrating the working scenario of the power distribution system 1000 provided in an embodiment of this application. Figure 1 As shown, the power distribution system 1000 of this application includes a switching power supply 100. The switching power supply 100 can be coupled to a power grid 1001 via a bus 1003. The power grid 1001 provides AC or DC power to the switching power supply 100, which rectifies the received AC power into DC power or inverts the received DC power into AC power to supply to the load 1002, thereby meeting the power requirements for the normal operation of the load 1002. The switching power supply 100 and the load 1002 can also be coupled via the bus 1003. The power grid 1001 can be understood as the relevant functional facilities or equipment in the power distribution system 1000 that enable power transmission and distribution, such as transmission lines and distribution lines.

[0070] For example, the power grid 1001 is used to supply alternating current (AC) to the switching power supply 100 via bus 1003. The switching power supply 100 is used to rectify the AC to the direct current (DC) required by the load 1002 and provide it to the load 1002 via bus 1003. The power grid 1001 and the switching power supply 100 can be coupled via the alternating current (AC) bus 1003, and the switching power supply 100 and the load 1002 can be coupled via the direct current (DC) bus 1003.

[0071] For example, load 1002 can be a single board, fan, chip, electric vehicle, or other device or component.

[0072] Please see Figure 2 , Figure 2 This is a schematic plan view of the power distribution system 1000 provided in an embodiment of this application. Figure 2 In the illustrated embodiment, the switching power supply 100 may be, but is not limited to, a power supply unit (PSU) for supplying power to the processor 1004 within the cluster server, such as a neural network processing unit (NPU). For example, the PSU may be used to convert standard 220V AC power into 48V low-voltage DC power required for the processor 1004 to operate. The processor 1004 is the load 1002.

[0073] For example, the power distribution system 1000 also includes a transformer 1005, to which AC power from the power grid 1001 is transmitted via bus 1003. The transformer 1005 is used to convert the AC power voltage and transmit the converted AC power directly or indirectly to the switching power supply 100 via bus 1003. For example, the power grid 1001 can transmit 110kV AC power to the transformer 1005. The transformer 1005 can step down the high-voltage AC power transmitted from the power grid 1001, such as reducing the 110kV AC power to 10kV AC power.

[0074] For example, the power distribution system 1000 also includes a distribution cabinet 1006, which is coupled between the transformer 1005 and the switching power supply 100. The transformer 1005 can input 10kV AC power to the distribution cabinet 1006, and the distribution cabinet 1006 receives the AC power input from the transformer 1005 and uses it for AC power distribution, that is, the distribution cabinet 1006 is used for AC power distribution and transmission to the switching power supply 100.

[0075] For example, the power distribution system 1000 also includes a plurality of air circuit breakers 1007, which can be used to cut off the current in the circuit when an overload or short circuit occurs in the circuit, so as to protect the functional devices or devices in the power distribution system 1000.

[0076] For example, the switching power supply 100 can also be used as an external power source to charge devices such as electric vehicles. Specifically, the switching power supply 100 can be applied in DC charging piles, which can receive AC power from a transformer and process or convert it into DC power required by the electric vehicle's battery for charging. The switching power supply 100 can also be applied in devices such as AC charging piles, on-board chargers, high-power charging piles, ultra-high-power charging piles, and portable charging piles.

[0077] It should be noted that, in Figure 2 The embodiments shown are merely illustrative examples of one possible embodiment of the switching power supply 100 of the power distribution system 1000 of this application, and do not limit the types and functions of functional devices or apparatuses in the power distribution system 1000, nor the application scenarios of the switching power supply 100 to this. In other embodiments of this application, the types and functions of functional devices or apparatuses in the power distribution system 1000 may be adjusted according to the actual application scenario of the power distribution system 1000, and this application embodiment does not specifically limit them. Furthermore, the switching power supply 100 can also be applied in different scenarios to achieve power conversion.

[0078] Typically, when a load undergoes a power shift, meaning its power demand surges or decreases abruptly, this sudden change in load demand is fed back to the grid, causing power fluctuations on the grid side. To prevent power fluctuations from overloading and damaging power distribution facilities, related technologies generally distribute power according to peak power to suppress these fluctuations. This means that when selecting power distribution equipment, such as circuit breakers and power capacity, the highest peak power of the fluctuating load is used for distribution. However, the load's power demand is not always at its peak. Therefore, using derating to suppress grid power fluctuations will result in a waste of power distribution infrastructure and capacity, failing to achieve maximum energy utilization.

[0079] This application provides a switching power supply that synchronously controls a first current supplied to the output bus by a first power conversion circuit based on a target current, and a second current supplied to the output bus by an energy storage device through a second power conversion circuit. This satisfies the current demand during power fluctuations on the load side, thereby suppressing power fluctuations on the input bus. The following description, in conjunction with specific embodiments and accompanying drawings, will further illustrate this switching power supply.

[0080] Please see Figure 3 , Figure 3 This is a schematic planar structure diagram of the switching power supply 100 of the power distribution system 1000 provided in an embodiment of this application. Figure 3 In the embodiment shown, the switching power supply 100 of this application includes a first power conversion circuit 10, a second power conversion circuit 20, and a controller 40. The first power conversion circuit 10 is used to couple to the power grid 1001 through the input bus Bus_in, and to output a first current i_duty_1 to the output bus Bus_out. The output bus Bus_out is coupled to the load 1002.

[0081] For example, the first power conversion circuit 10 can be a power factor correction (PFC) circuit or a DC-DC (Direct Current) circuit. Figure 3 In the illustrated embodiment, the first power conversion circuit 10 is a PFC circuit as an example for illustrative description.

[0082] Specifically, the input side of the first power conversion circuit 10 is coupled to the power grid 1001 via the input bus Bus_in. The AC or DC power supplied by the power grid 1001 is transmitted to the first power conversion circuit 10 via the input bus Bus_in. The output side of the first power conversion circuit 10 is coupled to the load 1002 via the output bus Bus_out. The first power conversion circuit 10 is used to convert AC or DC voltage into the AC or DC voltage required by the load side and transmit it to the load 1002 via the output bus Bus_out to ensure that the load 1002 can operate normally.

[0083] The second power conversion circuit 20 is coupled between the energy storage device 30 and the output bus Bus_out. The energy storage device 30 is used to store electrical energy and to output a second current i_duty_2 to the output bus Bus_out through the second power conversion circuit 20.

[0084] like Figure 3 As shown, the energy storage device 30 is coupled to the output bus Bus_out through the second power conversion circuit 20. That is, the energy storage device 30 is coupled to the output side of the first power conversion circuit 10 through the second power conversion circuit 20, so that the energy storage device 30 can provide electrical energy to the output bus Bus_out through the second power conversion circuit 20, or the output bus Bus_out can provide electrical energy to the energy storage device 30 through the second power conversion circuit 20 for storage.

[0085] For example, the second power conversion circuit 20 can be a bidirectional power conversion circuit, used to realize bidirectional conversion between the voltage on the energy storage device 30 side and the voltage on the output bus Bus_out side. For example, the second power conversion circuit 20 can be, but is not limited to, a DC-DC (Direct Current) circuit. The energy storage device 30 can be a battery, capacitor, or other functional device or structural device capable of storing electrical energy.

[0086] It should be noted that, in Figure 3 In the illustrated embodiment, the first power conversion circuit 10 and the power grid 1001 are coupled via the input bus Bus_in, and the first power conversion circuit 10 and the load 1002 are coupled via the output bus Bus_out. This is used as an example for illustration, but it does not limit the differences in structure or function between the input bus Bus_in and the output bus Bus_out; the difference is only illustrated by the different positions of the input bus Bus_in and the output bus Bus_out. That is, both the input bus Bus_in and the output bus Bus_out can be buses 1003 used for transmitting voltage or current. They can be, but are not limited to, AC buses for transmitting AC power, or they can be, but are not limited to, DC buses for transmitting DC power.

[0087] The controller 40 is electrically connected to the first power conversion circuit 10 and the second power conversion circuit 20, respectively, and is used to control the first current i_duty_1 and the second current i_duty_2 according to the target current i_ref, so as to suppress the power fluctuation of the input bus Bus_in through the target current i_ref. The target current i_ref is used to suppress the power fluctuation of the input bus Bus_in caused by the power fluctuation on the load side. The target current i_ref can be understood as the desired current that can suppress the power fluctuation of the input bus Bus_in caused by the power fluctuation on the load side.

[0088] Understandably, the controller 40 is used to control the first current i_duty_1 input to the output bus Bus_out from the first power conversion circuit 10 and the second current i_duty_2 input to the output bus Bus_out from the second power conversion circuit 20, so that the current in the output bus Bus_out can meet the requirements of the target current i_ref, thereby achieving the effect of suppressing the power fluctuation of the input bus Bus_in.

[0089] Understandably, the controller 40 controls the magnitude of the first current i_duty_1 provided by the first power conversion circuit 10 and the magnitude of the second current i_duty_2 provided by the energy storage device 30 to the output bus Bus_out through the second power conversion circuit 20 based on the magnitude of the target current i_ref, so that the two form a joint control and regulation effect, thereby meeting the current demand of the target current i_ref when the power of the input bus Bus_in fluctuates.

[0090] Please see Figure 4 As shown, Figure 4 This is a waveform diagram of the energy storage voltage of the energy storage device 30 in the switching power supply 100 provided in this embodiment of the application. Figure 4 As shown, when the current demand on the load side fluctuates slightly but the overall trend is linear, and then suddenly changes to a rectangular waveform within a short period of time, it can be understood as a surge in the current demand on the load side. At this time, the energy storage device 30 can be controlled to provide a second current i_duty_2 to the output bus Bus_out through the second power conversion circuit 20, that is, the energy storage device 30 releases electrical energy to the output bus Bus_out for charging. It can be understood that when the energy storage device 30 releases electrical energy to the output bus Bus_out for charging through the second power conversion circuit 20, such as... Figure 4As shown, in order to compensate for the current demand on the load side, when the current waveform on the corresponding load side suddenly becomes rectangular, the energy storage voltage waveform of the energy storage device 30 drops significantly, that is, the energy storage device 30 is in a discharge state to charge the output bus Bus_out. When both the voltage on the load side and the voltage on the input side remain stable, the power output can be kept stable, thereby suppressing the power fluctuation on the input bus side caused by the power fluctuation on the load side.

[0091] That is, the energy storage device 30 provides a second current i_duty_2 to the output bus Bus_out through the second power conversion circuit 20, and together with the first current i_duty_1 provided by the first power conversion circuit 10, it can meet the current demand of the load side. When fed back to the grid side, it can ensure the smooth power output of the input bus Bus_in on the grid side, and achieve the effect of suppressing the power fluctuation of the input bus Bus_in.

[0092] The switching power supply 100 of this application controls the first current i_duty_1 and the second current i_duty_2 based on the target current i_ref. That is, when power fluctuations occur on the input bus Bus_in, the energy storage device 30 provides compensation current to the output bus Bus_out through the second power conversion circuit 20 to meet the current demand when the load 1002 switches power, thereby enabling smooth power output on the input bus side and achieving the effect of suppressing power fluctuations. By controlling the current to suppress the power fluctuations on the input bus Bus_in caused by power fluctuations on the load side, the efficiency, response rate, and accuracy of the switching power supply 100 in suppressing input bus Bus_in fluctuations can be improved. While suppressing the power fluctuations on the input bus Bus_in, it can also avoid energy waste, improve energy utilization efficiency, and thus improve the working performance and lifespan of the power supply and distribution facilities, avoiding the adverse situation of damage to the power supply and distribution facilities due to overload caused by power fluctuations on the input bus Bus_in or the output bus Bus_out.

[0093] Meanwhile, compared to preventing power supply and distribution facilities from overload by derating configurations or using redundant switching power supplies, the switching power supply 100 of this application stores electrical energy by incorporating an energy storage device. When the power of the input bus Bus_in or the output bus Bus_out fluctuates, the second power conversion circuit 20 inputs a second current i_duty_2 to the output bus Bus_out to charge it. Through the coordination between the first current i_duty_1 and the second current i_duty_2, the current of the output bus Bus_out reaches the current requirement of the target current i_ref. This can suppress the power fluctuation of the input bus Bus_in, thereby avoiding the waste of power supply and distribution facilities and power capacity, and reducing power supply and distribution costs.

[0094] In addition, by controlling the first current i_duty_1 and the second current i_duty_2 based on the target current i_ref through the controller 40 to suppress power fluctuations, the internal structure design of the switching power supply 100 can be simplified, the overall structural volume of the switching power supply 100 can be reduced, the power supply and distribution interface can be simplified, and material costs can be saved.

[0095] Furthermore, since the power distribution system 1000 of this application uses the switching power supply 100 provided by any of the above implementation methods, the power distribution system 1000 of this application possesses all the possible beneficial effects of the switching power supply 100 provided by any of the above implementation methods.

[0096] Please see Figure 5 , Figure 5 This is a schematic diagram of the planar structure of the switching power supply 100 provided in an embodiment of this application. Figure 5 As shown, the switching power supply 100 also includes a voltage detection unit 50, which is used to acquire the detection voltage V_Bus of the input bus Bus_in and provide it to the controller 40. Specifically, the controller 40 calculates the current value of the target current i_ref based on the difference between the voltage value of the detection voltage V_Bus of the input bus Bus_in and the voltage value of the reference voltage of the input bus Bus_in.

[0097] The reference voltage of the input bus (Bus_in) can be understood as the desired voltage of the input bus (Bus_in), or the voltage at which the input bus (Bus_in) outputs power smoothly. The reference voltage value of the input bus (Bus_in) can change with at least one of the input voltage, output voltage, and output current of the switching power supply 100. That is, the reference voltage of the input bus (Bus_in) differs under different power scenarios.

[0098] The voltage detection unit 50 acquires the detected voltage V_Bus of the input bus Bus_in, and sends the difference between the detected voltage V_Bus and the reference voltage of the input bus Bus_in to the voltage closed-loop controller 80 for calculation. For example, the voltage closed-loop controller 80 can be as follows: Figure 5 The PID (proportion integration differentiation) controller shown is shown.

[0099] Understandably, the voltage closed-loop controller 80 can calculate the target current i_ref based on the difference between the detected voltage V_Bus of the input bus Bus_in and the reference voltage of the input bus Bus_in. The voltage closed-loop controller 80 provides the calculated target current i_ref to the controller 40, and the controller 40 controls the first current i_duty_1 and the second current i_duty_2 based on the target current i_ref, which can ensure the suppression effect on the power fluctuation of the input bus Bus_in.

[0100] Meanwhile, by obtaining the current value of the target current i_ref by the difference between the detection voltage of the input bus Bus_in and the reference voltage value of the input bus Bus_in, the efficiency of obtaining the current value of the target current i_ref can be improved and the suppression effect on the power fluctuation of the input bus Bus_in can be enhanced.

[0101] It should be noted that in this application Figure 5 In the illustrated embodiment, the example of obtaining the target current i_ref value by means of the difference between the detection voltage value of the input bus Bus_in and the reference voltage value of the input bus Bus_in is provided for illustrative purposes only. However, this does not limit the method of obtaining the target current i_ref value provided in this embodiment to this specific method. In other embodiments of this application, the target current i_ref value can be obtained in other ways, and this embodiment does not specifically limit these methods.

[0102] At the same time, Figure 5 In the illustrated embodiment, only one possible layout position of the voltage closed-loop controller 80 is described as an example, but the layout position of the voltage closed-loop controller 80 is not limited to this. In other embodiments of this application, the layout position of the voltage closed-loop controller 80 and the connection method with other functional devices can be adjusted according to the actual design and application scenario, and the embodiments of this application do not specifically limit this.

[0103] For example, such as Figure 5 As shown, the controller 40 determines the first reference current value i_ref_1 of the first power conversion circuit 10 and the second reference current value i_ref_2 of the second power conversion circuit 20 based on the current value of the target current i_ref.

[0104] Specifically, the sum of the first reference current value i_ref_1 and the second reference current value i_ref_2 is equal to the target current i_ref. That is, the target current i_ref and the first reference current value i_ref_1 and the second reference current value i_ref_2 satisfy the relationship: i_ref = i_ref_1 + i_ref_2.

[0105] The controller 40 can control the first current i_duty_1 output by the first power conversion circuit 10 based on the first reference current value i_ref_1, and control the second current i_duty_2 output by the second power conversion circuit 20 based on the second reference current value i_ref_2.

[0106] Understandably, the controller 40 determines the first reference current value i_ref_1 that the first power conversion circuit 10 needs to provide, and the second reference current value i_ref_2 that the energy storage device 30 needs to provide to the output bus Bus_out through the second power conversion current, based on the target current i_ref. The sum of the first reference current value i_ref_1 and the second reference current value i_ref_2 is equal to the current value of the target current i_ref. This allows the controller 40 to allocate the magnitude of the first reference current value i_ref_1 and the second reference current value i_ref_2 according to the target current i_ref. As a result, when the controller 40 controls the first current i_duty_1 based on the first reference current value i_ref_1 and the second current i_duty_2 based on the second reference current value i_ref_2, it achieves the effect of allocating the first current i_duty_1 and the second current i_duty_2, thereby improving the accuracy of the current change regulation.

[0107] For example, the first reference current value i_ref_1 is less than or equal to the maximum rated current value of the first power conversion circuit 10. The maximum rated current value of the first power conversion circuit 10 can be understood as the expected input current value of the first power conversion circuit 10 when its output power is 100%.

[0108] Understandably, part of the target current i_ref is provided by the first power conversion circuit 10 and another part is provided by the energy storage device 30. When the current provided by the first power conversion cannot meet the target current i_ref, the remaining current is provided by the energy storage device 30 to compensate, thereby ensuring that the target current i_ref can suppress the power fluctuation of the input bus Bus_in.

[0109] Meanwhile, by setting the first reference current value i_ref_1 to be less than or equal to the maximum rated current value of the first power conversion circuit 10, the first power conversion circuit 10 can be protected, preventing overload and damage to the internal functional components of the first power conversion circuit 10, thereby improving the working performance and lifespan of the first power conversion circuit 10.

[0110] For example, the first reference current value i_ref_1 is determined based on the current value of the maximum rated current of the first power conversion circuit 10. At this time, the second reference current value i_ref_2 satisfies the condition: i_ref_2 = i_ref - i_ref_1.

[0111] For example, the controller 40 can also control the current or voltage output by the first power conversion circuit 10, and control the current and voltage output by the second power conversion circuit 20. For example, but not limited to, the controller 40 can output pulse width modulation (PWM) signals to the first power conversion circuit 10 and the second power conversion circuit 20 to control the duty cycle of the power devices in the first power conversion circuit 10 and the second power conversion circuit 20 respectively, thereby achieving the effect of controlling the voltage or current output by the first power conversion circuit 10 and the second power conversion circuit 20.

[0112] For example, the first power conversion circuit 10 includes a first power switch (not shown in the figure), the second power conversion circuit 20 includes a second power switch (not shown in the figure), and the controller 40 controls the current value of the first current i_duty_1 to be equal to the first reference current value i_ref_1 by adjusting the duty cycle of the first power switch, and controls the current value of the second current i_duty_2 to be equal to the second reference current value i_ref_2 by adjusting the duty cycle of the second power switch.

[0113] For example, the first power switch and the second power switch can be MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors), IGBTs (Insulated-Gate Bipolar Transistors), or other power transistor devices. The first power switch and the second power switch can be of the same type or different types.

[0114] Understandably, by controlling the duty cycle of the first power switch, the current value of the first current i_duty_1 is made equal to the first reference current value i_ref_1. Similarly, by controlling the duty cycle of the second power switch, the current value of the second current i_duty_2 is made equal to the second reference current value i_ref_2. This ensures that the current values ​​of the first and second currents i_duty_1 are close to the target current i_ref, thus meeting the current requirements and accuracy needed to suppress power fluctuations at the input bus Bus_in. Furthermore, adjusting the current magnitude by controlling the duty cycle of the power switches reduces the difficulty of adjusting the current and improves accuracy and response speed.

[0115] Please see Figure 6 , Figure 6This is a schematic planar structure diagram of the switching power supply 100 provided in an embodiment of this application. Figure 6 In the embodiment shown, the switching power supply 100 further includes a current detection unit 60, which is used to acquire the detection current value IL_1 of the first current i_duty_1 and the detection current value IL_2 of the second current i_duty_2 and provide it to the controller 40.

[0116] The controller 40 adjusts the duty cycle of the first power switch based on the detected current value IL_1 of the first current i_duty_1, and adjusts the duty cycle of the second power switch based on the detected current value IL_2 of the second current i_duty_2.

[0117] Specifically, the detection current value IL_1 of the first current i_duty_1 is acquired and provided to the controller 40. Based on the acquired detection value of the first current i_duty_1, the controller 40 continuously adjusts the duty cycle of the first power switch, enabling the current value of the first current i_duty_1 to gradually approach the first reference current value i_ref_1. Simultaneously, the detection current value IL_2 of the second current i_duty_2 is acquired and provided to the controller 40. Based on the acquired detection value of the second current i_duty_2, the controller 40 continuously adjusts the duty cycle of the second power switch, enabling the current value of the second current i_duty_2 to gradually approach the second reference current value i_ref_2.

[0118] Understandably, by acquiring the current detection values ​​of the first current i_duty_1 and the second current i_duty_2 in real time, and continuously adjusting the duty cycle of the power switch to make the sum of the first current i_duty_1 and the second current i_duty_2 gradually approach the target current i_ref, the power fluctuation of the input bus Bus_in is gradually suppressed, thus stabilizing the power of the input bus Bus_in and improving the protection of power supply and distribution facilities.

[0119] Please see Figure 7 , Figure 7 This is a schematic planar structure diagram of the switching power supply 100 provided in an embodiment of this application. Figure 7 In the embodiment shown, when the voltage value of the detection voltage V_Bus of the input bus Bus_in is less than or equal to the maximum rated voltage value of the first power conversion circuit 10, the controller 40 controls the first current i_duty_1 to the target current i_ref, and controls the output bus Bus_out to input current to the energy storage device 30 through the second power conversion circuit 20 for charging.

[0120] Specifically, when the first current i_duty_1 input to the output bus Bus_out by the first power conversion circuit 10 can meet the requirements for the target current i_ref, the excess electrical energy in the output bus Bus_out can be converted by the second power conversion circuit 20 and input to the energy storage device 30 through the second power conversion circuit 20 to charge the energy storage device 30.

[0121] Understandably, when the first current i_duty_1 input to the output bus Bus_out can meet the requirements of the target current i_ref, the energy storage device 30 is charged and stored through the output bus Bus_out. This ensures that the energy stored in the energy storage device 30 meets the power supply requirements for the next power supply, thereby improving the energy utilization rate of the switching power supply 100.

[0122] Please see Figure 8 , Figure 8 This is a schematic planar structure diagram of the switching power supply 100 provided in an embodiment of this application. Figure 8 In the illustrated embodiment, the switching power supply includes a power limiting circuit 70. The power limiting circuit 70 limits the maximum power P_Max of the input bus Bus_in to be less than or equal to the sum of the maximum rated power value P_Max_1 of the first power conversion circuit 10 and the maximum rated power value P_Max_2 of the second power conversion circuit 20. That is, the maximum power P_Max of the input bus Bus_in satisfies the condition: P_Max ≤ P_Max_1 + P_Max_2.

[0123] Understandably, by setting the power limiting circuit 70, the functional components in the first power conversion circuit 10 and the second power conversion circuit 20 can be protected, preventing damage caused by overload, thereby improving the performance and lifespan of the first power conversion circuit 10 and the second power conversion circuit 20. In other words, by adding the power limiting circuit 70 before the first power conversion circuit 10, the power distribution between the first power conversion circuit 10 and the second power conversion circuit 20 is kept within the maximum rated power value, preventing overload of the first power conversion circuit 10 and the second power conversion circuit 20.

[0124] It should be noted that, in this embodiment, only one possible arrangement and positional relationship of the functional devices or structures of the switching power supply 100 is described as an example. The types, functions, arrangements, and positional relationships of the functional devices or structures within the switching power supply 100 provided in this embodiment are limited to this. In other embodiments of this application, the types, functions, arrangements, and positional relationships of the functional devices or structures within the switching power supply 100 can be adjusted according to the actual application scenario and design requirements of the switching power supply 100, and this embodiment does not impose specific limitations on these aspects.

[0125] In this embodiment, only one controller 40 in the switching power supply 100 is used as an example for illustrative purposes. It is understood that the switching power supply 100 can simultaneously control the first current i_duty_1 output by the first power conversion circuit 10 and the second current i_duty_2 output by the second power conversion circuit 20 through a single controller 40. That is, the currents of the two power conversion circuits are uniformly managed by a single control module. This ensures that the power output of the energy storage device 30 is met, while the charging and discharging current between the second power converter 20 and the output bus Bus_out can automatically match the current required by the load 1002, thereby suppressing power fluctuations at the input bus Bus_in and improving suppression efficiency to ensure smooth power output. For illustrative purposes, this application does not limit the number of controllers 40 in the switching power supply 100 to this. In other embodiments of this application, two or more controllers 40 may be provided.

[0126] Please see Figure 9 , Figure 9 This is a schematic planar structure diagram of the switching power supply 100 provided in an embodiment of this application. Figure 9 In the illustrated embodiment, the switching power supply 100 includes multiple controllers 40. That is, the switching power supply 100 can also control the first current i_duty_1 output by the first power conversion circuit 10 and the second current i_duty_2 output by the second power conversion circuit 20 through two controllers 40 respectively.

[0127] Specifically, there are two controllers 40, which are electrically connected to each other to enable signal transmission between them. The two controllers 40... Figure 9 The diagram shows a first controller 40a and a second controller 40b. The first controller 40a is electrically connected to the first power conversion circuit 10 to control the first current i_duty_1 output by the first power conversion circuit 10. The second controller 40b is electrically connected to the second power conversion circuit 20 to control the second current i_duty_2 output by the second power conversion circuit 20.

[0128] It is understandable that two controllers 40 are set in the switching power supply 100 to ensure that the first current i_duty_1 and the second current i_duty_2 cooperate to meet the current requirement of the target current i_ref, so as to suppress the power fluctuation of the input bus Bus_in and reduce the manufacturing cost of the switching power supply 100 of this application.

[0129] Please see Figure 10 and Figure 11 , Figure 10 This is a schematic diagram illustrating the workflow of the control method for the switching power supply provided in the embodiments of this application. Figure 11 This is a control block diagram of a switching power supply provided in an embodiment of this application. Figures 3-9 as well as Figure 10 In the illustrated embodiment, this application provides a control method for a switching power supply, used to control a switching power supply 100. Specifically, the control method for the switching power supply includes the following steps:

[0130] S100. The voltage detection unit 50 obtains the detection voltage V_Bus of the input bus Bus_in, wherein the input bus Bus_in is used to couple the power grid 1001 and the first power conversion circuit 10, the first power conversion circuit 10 is used to output the first current i_duty_1 to the output bus Bus_out, and the first power conversion circuit 10 is coupled to the load 1002 through the output bus Bus_out.

[0131] S200. Determine the target current i_ref based on the detection voltage V_Bus of the input bus Bus_in and the reference voltage of the input bus Bus_in. The target current i_ref is the desired current used to suppress the power fluctuation of the input bus Bus_in caused by the power fluctuation of the load.

[0132] For example, such as Figures 5-7 and Figure 10 and Figure 11 As shown, the detection voltage V_Bus of the input bus Bus_in can be obtained through the voltage detection unit 50 in the switching power supply 100. The difference between the detection voltage V_Bus of the input bus Bus_in and the reference voltage of the input bus Bus_in is sent to the voltage closed-loop controller to obtain the target current i_ref.

[0133] S300 controls the first current i_duty_1 output by the first power conversion circuit 10 and the second current i_duty_2 output by the energy storage device 30 through the second power conversion circuit 20 based on the target current i_ref. The energy storage device 30 is used to store electrical energy and is coupled to the output bus Bus_out through the second power conversion circuit 20.

[0134] Understandably, the control method of the switching power supply in this application controls the first current i_duty_1 and the second current i_duty_2 based on the target current i_ref. The target current i_ref is used to suppress the power fluctuation of the input bus Bus_in caused by the power fluctuation on the load side. Specifically, the magnitude of the first current i_duty_1 provided by the first power conversion circuit 10 and the magnitude of the second current i_duty_2 from the energy storage device 30 through the second power conversion circuit 20 are controlled synchronously based on the magnitude of the target current i_ref, creating a coordinated control effect between the two, thereby meeting the current demand of the target current i_ref when the power of the input bus Bus_in fluctuates.

[0135] In other words, the control method of the switching power supply in this application controls the first current i_duty_1 and the second current i_duty_2 based on the target current i_ref. This suppresses power fluctuations in the input bus Bus_in caused by power fluctuations on the load side by controlling the current, thereby improving the suppression efficiency, response rate, and accuracy of power fluctuations in the input bus Bus_in. While suppressing power fluctuations in the input bus Bus_in, it also avoids energy waste, improves energy utilization efficiency, and thus enhances the performance and lifespan of the power supply and distribution facilities. This prevents damage to the power supply and distribution facilities due to overload caused by power fluctuations in the input bus Bus_in and output bus Bus_out.

[0136] Meanwhile, compared to preventing overload of power supply and distribution facilities by derating the configuration or by equipping redundant switching power supplies 100, the control method of the switching power supply in this application controls the coordination between the first current i_duty_1 and the second current i_duty_2 to make the current of the output bus Bus_out reach the target current i_ref, which can suppress the power fluctuation of the input bus Bus_in, thereby avoiding the waste of power supply and distribution facilities and power capacity, and reducing power supply and distribution costs.

[0137] Please see Figure 12 , Figure 12 This is a schematic diagram illustrating the workflow of the control method for a switching power supply provided in an embodiment of this application. Figure 12 In the illustrated embodiment, after step S200, "determine the target current i_ref based on the detection voltage V_Bus of the input bus Bus_in and the reference voltage of the input bus Bus_in, the target current i_ref being used to suppress power fluctuations of the input bus Bus_in", the following step is also included:

[0138] S400, Determine whether the energy storage device 30 is enabled:

[0139] If so, then execute step S300 "Control the first current i_duty_1 and the second current i_duty_2 respectively based on the target current i_ref";

[0140] If not, then execute step S500 "control the current value of the first current i_duty_1 to be equal to the current value of the target current i_ref".

[0141] exist Figure 12 In the illustrated embodiment, whether the energy storage device 30 is enabled can be understood as whether the energy storage device 30 is working. After determining the target current i_ref based on the detection voltage V_Bus of the input bus Bus_in, it is further determined whether the energy storage device 30 needs to work.

[0142] Specifically, if the energy storage device 30 needs to work, then step S300 is executed: "Based on the target current i_ref, the first current i_duty_1 and the second current i_duty_2 input by the energy storage device 30 to the output bus Bus_out through the second power conversion circuit 20 are controlled respectively." That is, if it is determined that the energy storage device 30 needs to work, then the first power conversion circuit 10 and the energy storage device 30 work together to input current to the output bus Bus_out in order to meet the current requirement of the target current i_ref and thus suppress the power fluctuation of the input bus Bus_in.

[0143] If it is determined that the energy storage device 30 does not need to operate, then step S500 is executed to "control the current value of the first current i_duty_1 to be equal to the current value of the target current i_ref", meaning that the energy storage device 30 does not need to charge the output bus Bus_out. The first power conversion circuit 10 then provides current solely to the output bus Bus_out, and controls the magnitude of the second current i_duty_2 output by the energy storage device 30 to the output bus Bus_out through the second power conversion circuit 10 to be 0. This satisfies the current requirement of the target current i_ref, and the energy storage device 30 continues to store energy to provide power during the next power fluctuation. By first determining whether the energy storage device 30 is enabled, the response speed and adjustment efficiency of the current adjustment within the output bus Bus_out can be improved, thereby enhancing the power fluctuation suppression efficiency.

[0144] For example, determining whether the energy storage device 30 is enabled includes:

[0145] The deep filter voltage value and shallow filter voltage value of the input bus Bus_in are obtained through the sampling module. The average sampling time of the deep filter voltage value is greater than the average sampling time of the shallow filter voltage value.

[0146] Whether the energy storage device 30 is enabled is determined based on the shallow filtered voltage value:

[0147] If the shallow filter voltage value is outside the expected voltage range of the input bus Bus_in, the energy storage device 30 is enabled and outputs the second current i_duty_2 through the second power conversion circuit 20, wherein the expected voltage range of the input bus Bus_in is the voltage fluctuation range when the power of the input bus Bus_in is stable.

[0148] Understandably, when the power of the input bus Bus_in is smooth or stable, the fluctuation range of the input bus Bus_in voltage can be considered as the expected voltage range of the input bus Bus_in. When the shallow-filtered voltage value of the input bus Bus_in is outside the expected voltage range, it can be understood that the power fluctuation of the input bus Bus_in is large, and this power fluctuation needs to be quickly suppressed. At this time, the energy storage device 30 is enabled and discharges through the second power conversion circuit 30. That is, the energy storage device 30 and the first power conversion circuit 10 work together to input current to the output bus Bus_out to quickly meet the current demand of the target current i_ref, achieving the effect of quickly suppressing power fluctuations and improving the power fluctuation suppression efficiency.

[0149] For example, determining whether the energy storage device 30 is enabled includes:

[0150] Whether the energy storage device 30 is enabled is determined based on the deep-filtered voltage value:

[0151] If the deep filter voltage value is within the expected voltage range of the input bus Bus_in, and the energy storage voltage of the energy storage device 30 is less than the rated voltage of the energy storage device 30, then the energy storage device 30 is enabled and receives the current input to the output bus Bus_out through the second power conversion circuit 20 for charging.

[0152] Understandably, when the obtained deep-filtered voltage value is within the expected voltage range of the input bus Bus_in, it can be understood that the power output of the input bus Bus_in is stable at this time. Furthermore, when the energy storage voltage of the energy storage device 30 may be lower than its rated voltage, meaning the energy stored in the energy storage device 30 may not be saturated, current can be input to the energy storage device 30 through the output bus Bus_out to charge it, allowing the energy storage device 30 to store sufficient energy.

[0153] For example, determining whether the energy storage device 30 is enabled includes:

[0154] Whether the energy storage device 30 is enabled is determined based on the deep-filtered voltage value:

[0155] If the deep filter voltage value is within the expected voltage range of the input bus Bus_in and the current value of the first current i_duty_1 is greater than the current value of the target current i_ref, then the energy storage device 30 is enabled and receives the current input to the output bus Bus_out through the second power conversion circuit 20 for charging.

[0156] Understandably, when the deep-filtered voltage value obtained through sampling is within the expected voltage range of the input bus Bus_in, and the current value of the first current i_duty_1 is greater than the current value of the target current i_ref, that is, the power of the input bus Bus_in is stable, and the output bus Bus_out has excess electrical energy, the output bus Bus_out can input current to the energy storage device 30 through the second power converter 20 to charge it, thereby ensuring that the energy storage device 30 can store enough electrical energy to suppress the next power fluctuation.

[0157] Please see Figure 13 , Figure 13 This is a schematic diagram illustrating the workflow of the switching power supply control method provided in this application, which controls the first current i_duty_1 and the second current i_duty_2 based on the target current i_ref. Figure 13 In the illustrated embodiment, step S300, "based on the target current i_ref, controls the first current i_duty_1 and the second current i_duty_2 input to the output bus Bus_out through the second power conversion circuit 20 respectively", includes the following steps:

[0158] S301. Determine a first reference current value i_ref_1 and a second reference current value i_ref_2 based on the target current i_ref, wherein the sum of the first reference current value i_ref_1 and the second reference current value i_ref_2 is equal to the current value of the target current i_ref;

[0159] S302. Determine whether the first reference current value i_ref_1 is greater than or equal to the target current i_ref:

[0160] If so, control the first reference current value i_ref_1 to be equal to the target current i_ref, and control the output bus Bus_out to input current to the energy storage device 30 through the second power conversion circuit 20 to charge it;

[0161] If not, control the current value of the first current i_duty_1 to be equal to the first reference current value i_ref_1, and control the current value of the second current i_duty_2 to be equal to the second reference current value i_ref_2.

[0162] Understandably, if the first reference current value i_ref_1 is greater than or equal to the target current value i_ref, then the first power conversion circuit 10 can be used to meet the current requirement of the target current i_ref. In this case, current can be supplied to the output bus Bus_out solely through the first power conversion circuit 10 to suppress power fluctuations at the input bus Bus_in.

[0163] If the first reference current value i_ref_1 is less than the target current value i_ref, it can be understood that the first power conversion circuit 10 alone cannot meet the current requirement of the target current i_ref. In this case, the energy storage device 30 needs to be enabled to input a second current i_duty_2 to the output bus Bus_out for power compensation in order to meet the current requirement of the target current i_ref.

[0164] Of course, the above-described embodiments can be applied individually or in combination. The above description is the preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications are also considered to be within the scope of protection of this application.

Claims

1. A switching power supply, characterized in that, include: The first power conversion circuit is coupled to the power grid through an input bus and to the load through an output bus. The first power conversion circuit is used to convert the electrical energy provided by the power grid into a first current and output it to the output bus. The second power conversion circuit is coupled to the energy storage device and coupled to the load through the output bus. The second power conversion circuit is used to convert the electrical energy provided by the energy storage device into a second current and output it to the output bus. A controller, coupled to the first power conversion circuit and the second power conversion circuit, is used to control the first current output by the first power conversion circuit and the second current output by the second power conversion circuit according to a target current, wherein the target current is a desired current for suppressing power fluctuations of the input bus caused by power fluctuations of the load.

2. The switching power supply according to claim 1, characterized in that, The controller is configured to control the first current output by the first power conversion circuit according to a first reference current value, and to control the second current according to a second reference current value, wherein the sum of the first reference current value and the second reference current value is equal to the target current value.

3. The switching power supply according to claim 2, characterized in that, The first reference current value is less than or equal to the current value of the maximum rated current of the first power conversion circuit.

4. The switching power supply according to claim 2 or 3, characterized in that, The first power conversion circuit includes a first power switch, and the second power conversion circuit includes a second power switch; The controller is configured to control the current value of the first current to be equal to the first reference current value by adjusting the duty cycle of the first power switch, and to control the current value of the second current to be equal to the second reference current value by adjusting the duty cycle of the second power switch.

5. The switching power supply according to claim 4, characterized in that, The switching power supply further includes a current detection unit, used to acquire the detected current value of the first current and the detected current value of the second current and provide them to the controller; The controller is used to adjust the duty cycle of the first power switch based on the detected current value of the first current. The controller is used to adjust the duty cycle of the second power switch based on the detected current value of the second current.

6. The switching power supply according to any one of claims 1-5, characterized in that, The switching power supply further includes a voltage detection unit for acquiring the detection voltage of the input bus and providing it to the controller; The controller is configured to determine the target current value based on the voltage value of the detected voltage of the input bus and the voltage value of the reference voltage of the input bus.

7. The switching power supply according to claim 6, characterized in that, When the detected voltage value of the input bus is less than or equal to the maximum rated voltage value of the first power conversion circuit, The controller is configured to control the first current to be the target current, and to control the output bus to input current to the energy storage device coupled to the second power converter through the second power conversion circuit for charging.

8. The switching power supply according to any one of claims 1-7, characterized in that, The switching power supply also includes a power limiting circuit, used to limit the maximum power of the input bus to be less than or equal to the sum of the maximum rated power of the first power conversion circuit and the maximum rated power of the second power conversion circuit.

9. A power distribution system, characterized in that, The power supply includes the switching power supply according to any one of claims 1-8, wherein the switching power supply is used to receive electrical energy from the power grid and to provide electrical energy to a load.

10. A control method for a switching power supply, characterized in that, include: The voltage of the input bus is obtained through a voltage detection unit. The input bus is used to couple the power grid and the first power conversion circuit. The first power conversion circuit is used to output a first current to the output bus. The first power conversion circuit is coupled to the load through the output bus. The target current is determined based on the detected voltage of the input bus and the reference voltage of the input bus, wherein the target current is the desired current used to suppress the power fluctuation of the input bus caused by the power fluctuation of the load; Based on the target current, the first current output by the first power conversion circuit and the second current output by the energy storage device through the second power conversion circuit are controlled respectively, wherein the energy storage device is used to store electrical energy and is coupled to the output bus through the second power conversion circuit.

11. The control method for a switching power supply according to claim 10, characterized in that, After determining the target current based on the detected voltage of the input bus and the reference voltage of the input bus, the method further includes: Determine whether the energy storage device is enabled: If so, then the first current and the second current are controlled respectively based on the target current; If not, then the current value of the first current is controlled to be equal to the current value of the target current.

12. The control method for a switching power supply according to claim 11, characterized in that, The determination of whether the energy storage device is enabled includes: The deep filter voltage value and shallow filter voltage value of the input bus are obtained through the sampling module, wherein the average sampling time of the deep filter voltage value is greater than the average sampling time of the shallow filter voltage value. Whether the energy storage device is enabled is determined based on the deep filter voltage value or the shallow filter voltage value: If the shallow filter voltage value is outside the expected voltage value range of the input bus, the energy storage device is enabled and outputs the second current through the second power conversion circuit, wherein the expected voltage range of the input bus is the voltage fluctuation range when the power of the input bus is stable; or, If the deep filter voltage value is within the range of the desired voltage value of the input bus, and the energy storage voltage of the energy storage device is less than the rated voltage of the energy storage device, then the energy storage device is enabled and receives the current input to the output bus through the second power conversion circuit for charging.

13. The control method for a switching power supply according to claim 11, characterized in that, The step of controlling the first current and the second current based on the target current includes: A first reference current value and a second reference current value are determined based on the target current, wherein the sum of the first reference current value and the second reference current value is equal to the current value of the target current; Determine whether the first reference current value is greater than or equal to the target current value: If so, control the first reference current value to be equal to the target current value, and control the output bus to input current to the energy storage device through the second power conversion circuit to charge it; If not, control the value of the first current to be equal to the value of the first reference current, and control the value of the second current to be equal to the value of the second reference current.

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