Control method and device of energy storage power supply, computer equipment, readable storage medium and program product

Abstract

The invention relates to a control method and device of an energy storage power supply, computer equipment, a readable storage medium and a program product, and is applied to a controller of the energy storage power supply, the energy storage power supply comprises an alternating current output circuit, the alternating current output circuit is connected with the controller, the method comprises the following steps: determining a load state of the energy storage power supply according to an output power signal of the energy storage power supply, when the load state is a no-load state or a light-load state, a normal mode circuit in the AC output circuit is controlled to stop working, and an energy-saving mode circuit in the AC output circuit is controlled to work; the switching loss ratio of the energy-saving mode circuit is smaller than the switching loss ratio of the normal mode circuit. By adopting the method, the switching loss proportion can be reduced under the no-load or light-load condition.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a control method, device, computer equipment, readable storage medium and program product for an energy storage power supply. Background Art

[0002] With the rapid development of economy and industry, energy storage power sources have played an important role on the power generation side, grid side and user side.

[0003] Energy storage power supplies (also called energy storage devices) usually use "DC-AC" multi-stage conversion to power connected electrical equipment. The switching devices of the multi-stage converter are always in working state, and the switching loss corresponding to the switching devices is certain, which is independent of the load of the connected electrical equipment. Therefore, when the load of the energy storage power supply is no-load or light-loaded, the switching loss corresponding to the switching devices accounts for a large proportion, resulting in a decrease in the operating efficiency of the energy storage power supply when it is no-load or light-loaded. Summary of the invention

[0004] Based on this, it is necessary to provide a control method, device, computer equipment, readable storage medium and program product for an energy storage power supply that can reduce the proportion of switching losses under no-load or light-load conditions in order to address the above technical problems.

[0005] In a first aspect, the present application provides a control method for an energy storage power supply, which is applied to a controller of the energy storage power supply, wherein the energy storage power supply includes an AC output circuit, and the AC output circuit is connected to the controller, and the method includes:

[0006] Determine the load state of the energy storage power supply according to the output power signal of the energy storage power supply;

[0007] When the load state is a no-load state or a light-load state, the normal mode circuit in the AC output circuit is controlled to stop working, and the energy-saving mode circuit in the AC output circuit is controlled to work; the switching loss ratio of the energy-saving mode circuit is less than the switching loss ratio of the normal mode circuit.

[0008] In one embodiment, determining the load state of the energy storage power supply according to the output power signal of the energy storage power supply includes:

[0009] Obtaining a signal amplitude of an output power signal;

[0010] If the signal amplitude is within the preset amplitude range, it is determined that the load state of the energy storage power supply is a no-load state or a light-load state.

[0011] In one embodiment, the energy storage power supply further includes a switch unit, which is respectively connected to the normal mode circuit and the energy-saving mode circuit; controlling the normal mode circuit in the AC output circuit to stop working and controlling the energy-saving mode circuit in the AC output circuit to work includes:

[0012] The control switch unit is disconnected from the normal mode circuit, and the control switch unit is connected to the energy-saving mode circuit, so as to control the normal mode circuit to stop working and control the energy-saving mode circuit in the AC output circuit to work.

[0013] In one embodiment, the switch unit includes a first switch and a second switch, the first switch is connected to the input end of the AC output circuit, and the second switch is connected to the output end of the AC output circuit; controlling the switch unit to be disconnected from the normal mode circuit and controlling the switch unit to be connected to the energy-saving mode circuit includes:

[0014] The first switch and the second switch are controlled to be disconnected from the normal mode circuit, and the first switch and the second switch are controlled to be connected to the energy-saving mode circuit.

[0015] In one embodiment, the energy storage power supply further includes a detection circuit, which is connected to the output end of the AC output circuit and the controller respectively; before determining the load state of the energy storage power supply, the method further includes:

[0016] Acquiring a power signal at an output end of an AC output circuit detected by a detection circuit;

[0017] The power signal is determined to be the output power signal of the energy storage power supply.

[0018] In one of the embodiments, the detection circuit includes a detection resistor, a sampling unit, an amplification unit, a comparison unit and a peak holding unit connected in sequence, the detection resistor is connected to the output end of the AC output circuit, and the peak holding unit is connected to the controller;

[0019] A sampling unit, used for obtaining a resistance voltage of a detection resistor;

[0020] an amplifying unit, used for amplifying the resistor voltage to obtain an amplified voltage;

[0021] A comparison unit, used to obtain a peak signal in a preset range in the amplified voltage;

[0022] The peak holding unit is used to maintain the peak value in the peak signal to obtain an output power signal.

[0023] In one embodiment, the method further comprises:

[0024] When the load state is neither a no-load state nor a light-load state, the energy-saving mode circuit is controlled to stop working, and the normal mode circuit is controlled to work.

[0025] In one embodiment, the energy-saving mode circuit includes a first inverter module and a first transformer module connected to each other; the first inverter module is used to invert a first DC signal received at an input end of the AC output circuit into a first AC signal, and the first transformer module is used to boost the first AC signal to obtain an output power signal at an output end of the AC output circuit;

[0026] The normal mode circuit includes a second transformer module and a second inverter module connected to each other; the second transformer module is used to boost the first DC signal received at the input end of the AC output circuit to obtain a second DC signal, and the second inverter module is used to invert the second DC signal to obtain an output power signal at the output end of the AC output circuit.

[0027] In a second aspect, the present application further provides a control device, which is applied to an energy storage power supply, wherein the energy storage power supply includes an AC output circuit; the control device includes:

[0028] A first determination module, used to determine the load state of the energy storage power supply according to the output power signal of the energy storage power supply;

[0029] The first control module is used to control the normal mode circuit in the AC output circuit to stop working and control the energy-saving mode circuit in the AC output circuit to work when the load state is a no-load state or a light-load state; the switching loss ratio of the energy-saving mode circuit is less than the switching loss ratio of the normal mode circuit.

[0030] In a third aspect, the present application further provides a computer device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of any of the above methods when executing the computer program.

[0031] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program implements the steps of any of the above methods when executed by a processor.

[0032] In a fifth aspect, the present application also provides a computer program product, including a computer program, which implements the steps of any of the above methods when executed by a processor.

[0033] The control method, device, computer equipment, readable storage medium and program product of the above-mentioned energy storage power supply can determine the load state of the energy storage power supply according to the output power signal of the energy storage power supply, and when the load state is a no-load state or a light-load state, control the normal mode circuit in the AC output circuit to stop working, and control the energy-saving mode circuit in the AC output circuit to work, and the switching loss ratio of the energy-saving mode circuit is less than the switching loss ratio of the normal mode circuit. Therefore, in the no-load state or the light-load state, the energy-saving mode circuit can reduce the switching loss ratio and improve the operating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the drawings required for use in the embodiments of the present application or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0035] FIG1 is a schematic diagram of the structure of an energy storage power supply in one embodiment;

[0036] Figure 2 A schematic flow chart of a method for controlling an energy storage power supply in one embodiment;

[0037] Figure 3 A schematic diagram of a flow chart for determining a load state of an energy storage power supply in one embodiment;

[0038] Figure 4 It is a structural schematic diagram of yet another energy storage power supply in an embodiment;

[0039] Figure 5 It is a structural schematic diagram of yet another energy storage power supply in an embodiment;

[0040] Figure 6 A schematic diagram of a process for determining an output power signal in one embodiment;

[0041] Figure 7 It is a structural schematic diagram of yet another energy storage power supply in an embodiment;

[0042] Figure 8 is a schematic diagram of the structure of a detection circuit in one embodiment;

[0043] Fig. 9 is a schematic diagram of signals in one embodiment;

[0044] Fig.10 A schematic diagram of a process of a method for controlling an energy storage power supply in one embodiment;

[0045] Fig.11is a structural block diagram of a control device in one embodiment;

[0046] FIG. 12 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0048] Energy storage power supplies, such as outdoor solar storage power supplies, need to drive mainly household appliances during operation, such as large appliances with medium and large loads such as water heaters, air conditioners, refrigerators, and small load electrical equipment such as mobile phones and LED lights. The power required to power medium and large loads is quite different from that of small loads, so the power supply of energy storage power supplies will fluctuate with the different loads connected.

[0049] Furthermore, when the energy storage power supply is unloaded or lightly loaded, the switching loss corresponding to the switching device accounts for a large proportion. On the one hand, this will cause the energy storage power supply to have a reduced operating efficiency and low energy utilization when it is unloaded or lightly loaded. On the other hand, the heat generated by the switching device reduces the reliability of the energy storage power supply and increases the heat dissipation cost. Based on this, it is necessary to provide a control method for the energy storage power supply, which will be introduced below.

[0050] FIG1 is a schematic diagram of the structure of an energy storage power supply in an embodiment. The control method of the energy storage power supply provided in the embodiment of the present application can be applied in the application environment shown in FIG1. ​​As shown in FIG1, the energy storage power supply 100 may include a controller 101 and an AC output circuit 102. The controller 101 is connected to the AC output circuit 102.

[0051] The controller 101 includes but is not limited to a central processing unit (CPU), a digital signal processor (DSP), a field programmable gate array (FPGA) or other programmable logic devices.

[0052] The AC output circuit 102 is used to convert the input current into the required AC for output. The input end of the AC output circuit 102 can be connected to an energy storage battery, which can be placed inside the energy storage power supply 100 or externally connected to the outside of the energy storage power supply 100. This embodiment is not limited.

[0053] Figure 2FIG. 1 is a flow chart of a method for controlling an energy storage power supply in an embodiment. In an exemplary embodiment, Figure 2 As shown, a control method for an energy storage power supply is provided, which is described by taking the method applied to the controller in FIG. 1 as an example, and includes the following S201 to S202.

[0054] S201, determining a load state of the energy storage power supply according to an output power signal of the energy storage power supply.

[0055] In this embodiment, the controller 101 can obtain the output power signal of the energy storage power supply 100. Optionally, the controller 101 can obtain the output power signal of the energy storage power supply 100 through a detection device, or after obtaining the output signal of the energy storage power supply 100 through a detection device, perform spectrum analysis and other processing on the output signal to obtain the output power signal of the energy storage power supply 100.

[0056] The output power signal can represent the output power of the energy storage power supply 100. For example, the amplitude of the power output signal can be positively correlated with the output power of the energy storage power supply 100, and for another example, the frequency of the power output signal can be positively correlated with the output power of the energy storage power supply 100, but this embodiment is not limited thereto.

[0057] Furthermore, the controller 101 can determine the load state of the energy storage power supply 100 according to the output power signal of the energy storage power supply 100. The load state of the energy storage power supply 100 may be a no-load state, a light-load state, a full-load state, or an overload state. In some embodiments, the load state of the energy storage power supply 100 may also be divided into two categories, one indicating that the load state of the energy storage power supply 100 is a no-load state or a light-load state, and the other indicating that the load state of the energy storage power supply 100 is a non-no-load state and a non-light-load state.

[0058] Optionally, the controller 101 may determine the load state of the energy storage power supply 100 based on the signal parameters of the output power signal of the energy storage power supply 100 and a preset threshold value. The signal parameters include, but are not limited to, the amplitude or frequency of the output power signal. The preset threshold value may be set according to actual needs. Exemplarily, if the frequency of the output power signal is greater than the preset threshold value, the controller 101 determines that the load state of the energy storage power supply 100 is a non-no-load state and a non-light-load state. Conversely, if the frequency of the output power signal is not greater than the preset threshold value, the controller 101 determines that the load state of the energy storage power supply 100 is a no-load state or a light-load state.

[0059] S202, when the load state is a no-load state or a light-load state, the normal mode circuit in the AC output circuit is controlled to stop working, and the energy-saving mode circuit in the AC output circuit is controlled to work; the switching loss ratio of the energy-saving mode circuit is less than the switching loss ratio of the normal mode circuit.

[0060] In this embodiment, please continue to refer to FIG. 1 , the AC output circuit 102 includes a normal mode circuit 1021 and an energy-saving mode circuit 1022. The normal mode circuit 1021 and the energy-saving mode circuit 1022 do not work at the same time. In other words, when the AC output circuit 102 is working, only one of the normal mode circuit 1021 and the energy-saving mode circuit 1022 is working at the same time.

[0061] Among them, the proportion of switching loss in the energy-saving mode circuit 1022 is less than the proportion of switching loss in the normal mode circuit 1021. The proportion of switching loss refers to the proportion of the loss of the switching device to the total loss. The switching device includes but is not limited to an insulated gate bipolar transistor (IGBT) and a metal-oxide-semiconductor field-effect transistor (MOSFET). In other words, the proportion of the loss of the switching device in the energy-saving mode circuit 1022 to the total loss is less than the proportion of the loss of the switching device in the normal mode circuit 1021 to the total loss.

[0062] The proportion of switching loss in the energy-saving mode circuit 1022 can be reduced by lowering the switching frequency of the switching device, using soft switching technology, using a switching device with low loss characteristics, or improving the driving circuit, but this embodiment is not limited thereto.

[0063] Under normal working conditions, the normal mode circuit 1021 in the AC output circuit 102 works. If the controller 101 determines that the load state of the energy storage power supply 100 is a no-load state or a light-load state, the controller 101 controls the normal mode circuit 1021 in the AC output circuit 102 to stop working, and controls the energy-saving mode circuit 1022 in the AC output circuit 102 to work. In other words, the controller 101 switches the AC output circuit 102 from working in the normal mode circuit 1021 to working in the energy-saving mode circuit 1022.

[0064] Optionally, the controller 101 can control the normal mode circuit 1021 or the energy-saving mode circuit 1022 in the AC output circuit 102 to work through a control signal. For example, when the controller 101 sends a control signal A to the AC output circuit 102, the energy-saving mode circuit 1022 works and the normal mode circuit 1021 stops working; when the controller 101 sends a control signal B to the AC output circuit 102, the energy-saving mode circuit 1022 stops working and the normal mode circuit 1021 works.

[0065] In the control method of the above energy storage power supply, since the load state of the energy storage power supply can be determined according to the output power signal of the energy storage power supply, and when the load state is a no-load state or a light-load state, the normal mode circuit in the AC output circuit is controlled to stop working, and the energy-saving mode circuit in the AC output circuit is controlled to work, and the switching loss ratio of the energy-saving mode circuit is less than the switching loss ratio of the normal mode circuit, therefore, in the no-load state or the light-load state, the energy-saving mode circuit can reduce the switching loss ratio and improve the operating efficiency.

[0066] In an exemplary embodiment, optionally, the above control method may further include the following steps:

[0067] When the load state is neither a no-load state nor a light-load state, the energy-saving mode circuit is controlled to stop working, and the normal mode circuit is controlled to work.

[0068] In this embodiment, if the load state of the energy storage power supply is neither in the no-load state nor in the light-load state, the controller 100 controls the energy-saving mode circuit 1022 to stop working, and controls the normal mode circuit 1021 to work. In other words, the controller 101 switches the AC output circuit 102 from working in the energy-saving mode circuit 1022 to working in the normal mode circuit 1021.

[0069] In the above embodiment, since the energy-saving mode circuit can be controlled to stop working and the normal mode circuit can be controlled to work when the load state is neither no-load nor light-load, the normal operation of the energy storage power supply will not be affected, and the flexibility is high.

[0070] Figure 3 FIG. 1 is a flow chart of determining the load state of an energy storage power supply in an embodiment. In an exemplary embodiment, as shown in FIG. Figure 3 As shown, S201 includes S301 to S302.

[0071] S301, obtaining a signal amplitude of an output power signal.

[0072] In this embodiment, the controller 101 may obtain the signal amplitude of the output power signal through a spectrum sensing device such as an oscilloscope. It should be noted that the signal amplitudes corresponding to different time points may be different.

[0073] S302: If the signal amplitude is within a preset amplitude range, it is determined that the load state of the energy storage power supply is a no-load state or a light-load state.

[0074] In this embodiment, the controller 101 determines whether the load state of the energy storage power supply is a no-load state or a light-load state by whether the signal amplitude falls within a preset amplitude range. The preset amplitude range can be set according to demand, for example, the preset amplitude range can be a range close to 0.

[0075] Furthermore, when the signal amplitude of the output power signal is within the preset amplitude range, the controller 101 determines that the load state of the energy storage power supply 100 is a no-load state or a light-load state. It is understandable that when the signal amplitude of the output power signal is not within the preset amplitude range, the controller 101 can determine that the load state of the energy storage power supply is a non-no-load state and a non-light-load state.

[0076] In the above embodiment, since the signal amplitude of the output power signal can be obtained, and when the signal amplitude is within the preset amplitude range, the load state of the energy storage power supply is determined to be a no-load state or a light-load state. Therefore, it is possible to efficiently and accurately determine whether the load state is in a no-load state or a light-load state.

[0077] Figure 4 FIG. 1 is a schematic diagram of a structure of another energy storage power supply in an embodiment. Figure 4 As shown, in an exemplary embodiment, optionally, the energy storage power supply 100 further includes a switch unit 400, and the switch unit 400 is respectively connected to the normal mode circuit 1021 and the energy-saving mode circuit 1022. Further, the above S202 can be implemented in the following manner:

[0078] The control switch unit is disconnected from the normal mode circuit, and the control switch unit is connected to the energy-saving mode circuit, so as to control the normal mode circuit to stop working and control the energy-saving mode circuit in the AC output circuit to work.

[0079] In this embodiment, if the load state is a no-load state or a light-load state, the controller 101 controls the switch unit 400 to be disconnected from the normal mode circuit 1021, and controls the switch unit 400 to be connected to the energy-saving mode circuit 1022. In other words, the controller 101 disconnects the path between the control switch unit 400 and the normal mode circuit 1021, and conducts the path between the control switch unit 400 and the energy-saving mode circuit 1022, so that the normal mode circuit 1021 can be controlled to stop working, and the energy-saving mode circuit 1022 can be controlled to work.

[0080] It can be understood that if the load state is neither in the no-load state nor in the light-load state, the controller 101 controls the switch unit 400 to be connected to the normal mode circuit 1021, and controls the switch unit 400 to be disconnected from the energy-saving mode circuit 1022. In other words, the controller 101 turns on the path between the control switch unit 400 and the normal mode circuit 1021, and disconnects the path between the control switch unit 400 and the energy-saving mode circuit 1022, so that the normal mode circuit 1021 can be controlled to work, and the energy-saving mode circuit 1022 can be controlled to stop working.

[0081] In the above embodiment, the energy storage power supply also includes a switch unit, and the switch unit is respectively connected to the normal mode circuit and the energy-saving mode circuit. Since the switch unit can be controlled to be disconnected from the normal mode circuit and connected to the energy-saving mode circuit, the normal mode circuit can be efficiently controlled to stop working and the energy-saving mode circuit in the AC output circuit can be controlled to work through the switch unit.

[0082] Please continue to refer to Figure 4 In one embodiment, optionally, the switch unit 400 includes a first switch 401 and a second switch 402. The first switch 401 is connected to the input end of the AC output circuit 102, and the second switch 402 is connected to the output end of the AC output circuit 102. In one embodiment, optionally, the input end of the AC output circuit 102 is used to receive a DC, and the output end of the AC output circuit 102 is used to output an AC, that is, the first switch 401 is a switch on the DC side, and the second switch 402 is a switch on the AC side.

[0083] Furthermore, the above-mentioned “controlling the switch unit to be disconnected from the normal mode circuit, and controlling the switch unit to be connected to the energy-saving mode circuit” can be achieved by:

[0084] The first switch and the second switch are controlled to be disconnected from the normal mode circuit, and the first switch and the second switch are controlled to be connected to the energy-saving mode circuit.

[0085] In this embodiment, if the load state is a no-load state or a light-load state, the controller 101 controls the first switch 401 and the second switch 402 to be disconnected from the normal mode circuit 1021, and controls the first switch 401 and the second switch 402 to be connected to the energy-saving mode circuit 1022. In this way, the energy-saving mode circuit 1022 in the AC output circuit 102 is connected, and the normal mode circuit 1021 is cut out, thereby controlling the normal mode circuit 1021 to stop working, and controlling the energy-saving mode circuit 1022 to work.

[0086] It can be understood that if the load state is neither in a no-load state nor in a light-load state, the controller 101 controls the first switch 401 and the second switch 402 to be disconnected from the energy-saving mode circuit 1022, and controls the first switch 401 and the second switch 402 to be connected to the normal mode circuit 1021. In this way, the energy-saving mode circuit 1022 in the AC output circuit 102 is cut out, and the normal mode circuit 1021 is connected, thereby controlling the normal mode circuit 1021 to work, and controlling the energy-saving mode circuit 1022 to stop working.

[0087] In the above embodiment, since the switch unit includes a first switch and a second switch, the first switch is connected to the input end of the AC output circuit, and the second switch is connected to the output end of the AC output circuit. In this way, after controlling the first switch and the second switch to be disconnected from the normal mode circuit, and controlling the first switch and the second switch to be connected to the energy-saving mode circuit, the normal mode circuit can be efficiently and accurately controlled to stop working and the energy-saving mode circuit can be controlled to work, thereby reducing the proportion of switching losses in no-load or light-load states.

[0088] Figure 5 FIG. 1 is a schematic diagram of a structure of another energy storage power supply in an embodiment. Figure 5 As shown, in an exemplary embodiment, optionally, the energy storage power supply 100 further includes a detection circuit 501, which is connected to the output end of the AC output circuit 102 and the controller 101 respectively. The detection circuit 501 is used to obtain a power signal at the output end of the AC output circuit 102.

[0089] Figure 6 This is a schematic diagram of a flow chart of determining an output power signal in an embodiment. Before S201, the control method further includes S601 to S602.

[0090] S601, obtaining a power signal of an output end of an AC output circuit detected by a detection circuit.

[0091] In this embodiment, after acquiring the power signal at the output end of the AC output circuit 102 , the detection circuit 501 sends the power signal to the controller 101 , so that the controller 101 acquires the power signal.

[0092] S602: Determine that the power signal is an output power signal of an energy storage power supply.

[0093] Furthermore, the controller 101 uses the power signal as an output power signal of the energy storage power supply 100 , and determines the load state of the energy storage power supply 100 according to the output power signal of the energy storage power supply 100 .

[0094] In the above embodiment, since the energy storage power supply also includes a detection circuit, the detection circuit is connected to the output end of the AC output circuit and the controller respectively. In this way, the power signal of the output end of the AC output circuit detected by the detection circuit can be efficiently acquired, and the power signal can be determined to be the output power signal of the energy storage power supply.

[0095] Figure 7 FIG. 1 is a schematic diagram of a structure of another energy storage power supply in an embodiment. Figure 7 As shown, in an exemplary embodiment, the energy-saving mode circuit 1022 includes a first inverter module 1022a and a first transformer module 1022b connected to each other.

[0096] The first inverter module 1022a is used to invert the first DC signal received at the input end of the AC output circuit 102 into a first AC signal, and the first transformer module 1022b is used to boost the first AC signal to obtain an output power signal at the output end of the AC output circuit 102. In other words, the energy-saving mode circuit 1022 inverts the DC input to the AC output circuit 102 into AC, and then outputs it after boosting it on the AC side.

[0097] Exemplarily, the first inverter module 1022a may include but is not limited to an inverter, and the first transformer module 1022b may include but is not limited to a transformer.

[0098] The normal mode circuit 1021 includes a second transformer module 1021a and a second inverter module 1021b connected to each other. The second transformer module 1021a is used to boost the first DC signal received at the input end of the AC output circuit 102 to obtain a second DC signal, and the second inverter module 1021b is used to invert the second DC signal to an output power signal at the output end of the AC output circuit 102. In other words, the normal mode circuit 1021 first inverts the DC input to the AC output circuit 102 into AC, and then outputs it after boosting it on the AC side.

[0099] Exemplarily, the second transformer module 1021a includes but is not limited to a bidirectional buck-boost converter, and the second inverter module 1021b includes but is not limited to an inverter. In some embodiments, the normal mode circuit 1021 may also include other devices, for example, the normal mode circuit 1021 may also include an LLC resonant converter disposed between the input end of the AC output circuit 102 and the second transformer module 1021a.

[0100] In the above embodiment, since the normal mode circuit boosts the voltage on the AC side, and the AC side boost is usually achieved by turning on and off the switch device, more switching losses will be generated, and the switching losses are independent of the load size. Therefore, when the load is small, that is, in the no-load state or light-load state, the energy storage power supply has low energy transmission efficiency and reduced operating efficiency. The energy-saving mode circuit does not need to boost the voltage on the AC side, but on the DC side. The required switching devices are less than those required for the AC side boost, so the operating loss can be reduced, and the energy-saving function under no-load or light-load conditions can be achieved.

[0101] In one embodiment, please continue to refer to Figure 7 The energy storage power supply 100 may further include an energy storage battery 701, and the first switch 401 is disposed between the energy storage battery 701 and the AC output circuit 102. The energy storage battery 701 is used to provide the AC output circuit 102 with a first DC signal.

[0102] In one embodiment, the output end of the AC output circuit 102 can output the rated AC voltage of the power grid to connect to the load outside the energy storage power supply 100. The load may include but is not limited to electrical appliances such as refrigerators, televisions, desk lamps, and laptop computers.

[0103] In one embodiment, please continue to refer to Figure 7 The energy storage power supply 100 may further include a drive circuit 702. The drive circuit 702 is connected to the controller 101, the AC output circuit 102, the first switch 401 and the second switch 402 respectively. The drive circuit 702 is used to control the AC output circuit 102, the first switch 401 and the second switch 402 according to the load state determined by the controller 101, so that when the load state is a no-load state or a light-load state, the normal mode circuit in the AC output circuit stops working, and the energy-saving mode circuit in the AC output circuit is controlled to work, and when the load state is a non-no-load state and a non-light-load state, the energy-saving mode circuit is controlled to stop working, and the normal mode circuit is controlled to work.

[0104] At present, the AC current output by the energy storage power supply in the no-load state or light-load state is small, usually at the milliampere level. On the one hand, it is difficult for the current transformer or the Hall sensor to accurately measure the AC current. On the other hand, the waveform of the AC current is not a sine wave, but a pulse signal similar to an impact type, which cannot meet the requirements of analog-to-digital conversion. Based on this, this embodiment also provides a detection circuit that is conducive to obtaining the output power signal.

[0105] Figure 8 FIG. 1 is a schematic diagram of a detection circuit in an embodiment. Figure 8As shown, in an exemplary embodiment, optionally, the detection circuit 501 includes a detection resistor 801, a sampling unit 802, an amplification unit 803, a comparison unit 804 and a peak holding unit 805 connected in sequence. Wherein, V1 represents the output of the AC output circuit 102, the detection resistor 801 is connected to the output end of the AC output circuit 102, and the peak holding unit 805 is connected to the controller 101.

[0106] The sampling unit 803 is used to obtain the resistance voltage of the detection resistor 801. The sampling unit 803 can periodically obtain the resistance voltage across the detection resistor 801.

[0107] In this embodiment, in the case of no-load state or light-load state, the load of the energy storage power supply 100 is small, and the AC current output by the energy storage power supply 100 is difficult to measure accurately and the error is large. Therefore, the sampling unit 803 will obtain the resistance voltage of the detection resistor 801. The resistance voltage is the product of the resistance value of the detection resistor 801 and the AC current of the energy storage power supply 100. In this way, the AC current signal output by the energy storage power supply 100 when light-loaded or no-loaded is converted into an AC voltage signal, which is conducive to accurately measuring the AC load current.

[0108] The amplifying unit 803 is used to amplify the resistance voltage acquired by the sampling unit 803 to obtain an amplified voltage. The amplification factor of the resistance voltage can be set according to actual needs, and this embodiment does not limit it.

[0109] The comparison unit 804 is used to obtain the peak signal of the amplified voltage within a preset range. In this embodiment, in the light load state or no-load state, the energy storage power supply 100 outputs a small-amplitude impulse pulse signal, and the amplified voltage is also an impulse pulse signal. Fig. 9 is a schematic diagram of a signal in an embodiment. The impulse signal of the impact type can refer to Fig. 9 Figure (a) in .

[0110] Since the amplitude of the pulse signal changes periodically, but the effective value of the amplitude is a fixed value, it is necessary to obtain a peak signal in the amplified voltage within a preset range through the comparison unit 804. The preset range can be set according to requirements.

[0111] Optionally, the comparison unit 804 compares the amplified voltage with a preset value, and if the amplitude of the voltage signal is less than the preset value, the amplitude is kept unchanged, and if the amplitude of the voltage signal is not less than the preset value, 0 is output. In some embodiments, when the amplitude of the voltage signal is greater than the preset value, the amplitude is kept unchanged, and when the amplitude of the voltage signal is not greater than the preset value, 0 is output. The preset voltage may be 0.

[0112] Exemplarily, the comparison unit 804 outputs 0 when the amplitude of the amplified signal having both positive and negative values ​​is greater than 0, and outputs the original value when it is less than 0. In this way, the comparison unit 804 outputs a peak signal containing only negative values.

[0113] The peak holding unit 805 is used to maintain the peak value in the peak signal to obtain an output power signal. In other words, the peak holding unit 805 can capture and maintain the highest amplitude of the peak signal until the next new amplitude is obtained. The output power signal obtained by the peak holding unit 805 can be referred to Fig. 9 Figure (b) in the figure.

[0114] In the above embodiment, since the detection circuit includes a detection resistor, a sampling unit, an amplifying unit, a comparing unit and a peak holding unit connected in sequence, the detection resistor is connected to the output end of the AC output circuit, and the peak holding unit is connected to the controller. Therefore, the resistance voltage of the detection resistor can be obtained through the sampling unit, and the resistance voltage is amplified by the amplifying unit to obtain an amplified voltage, and then the peak signal in the amplified voltage within a preset range is obtained through the comparing unit, and finally the peak value in the peak signal is maintained by the peak holding unit, so that an output power signal that can be detected for a long time can be obtained.

[0115] In one embodiment, optionally, since the power of the detection resistor 801 is proportional to the resistance value of the detection resistor 801, if the resistance value of the detection resistor 801 is large, the loss of the energy storage power supply 100 will increase and the energy conversion efficiency will be reduced. Therefore, the resistance value of the detection resistor 801 is less than or equal to a preset resistance threshold value, and the preset resistance threshold value can be a value close to 0, for example, the preset resistance threshold value can be 0.1 ohms.

[0116] Please continue to refer to Figure 8 In one embodiment, optionally, the amplification unit 803 includes a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C2, a DC power supply V2 and a transistor Q1. The negative electrode of the sampling unit 802 is grounded, and the positive electrode of the sampling unit 802 is connected to the first end of the capacitor C2. The second end of the capacitor C2, the first end of the resistor R2, and the first end of the resistor R3 are all connected to the base of the transistor Q1, the second end of the resistor R2 is connected to the DC power supply V2, the DC power supply V2 is grounded, the second end of the resistor R3 is grounded, the first end of the resistor R4 is connected to the collector of the transistor Q3, the second end of the resistor R4 is connected to the DC power supply V2, the first end of the resistor R5 is connected to the emitter of the transistor Q3, and the second end of the resistor R5 is grounded.

[0117] Optionally, the comparison unit 804 includes a resistor R6, a capacitor C3, a DC power supply V3 and a differential comparator U1A. The first end of the capacitor C3 is connected to the transistor Q1 and the resistor R4 respectively, the second end of the capacitor C3 is connected to the negative input end of the differential comparator U1A, the first end of the DC power supply V3 is connected to the positive power supply electrode of the differential comparator U1A, and the second end of the DC power supply V3 is grounded. The negative power supply electrode of the differential comparator U1A is grounded, and the output end of the differential comparator U1A is connected to the resistor R6.

[0118] Optionally, the peak holding unit 805 includes a resistor R7, a resistor R8, a capacitor C4, a capacitor C5, a DC power supply V4 and an operational amplifier U2A. The negative input terminal of the operational amplifier U2A is connected to the resistor R6, the positive input terminal of the operational amplifier U2A is grounded, the resistor R7 is connected in parallel with the capacitor C4, the first end of the resistor R7 and the first end of the capacitor C4 are both connected to the negative input terminal of the operational amplifier U2A and the resistor R6, the second end of the resistor R7 and the second end of the capacitor C4 are both connected to the output terminal of the operational amplifier U2A, the output terminal of the operational amplifier U2A is also connected to the resistor R8, the first end of the capacitor C5 is connected to the resistor R8, and the second end of the capacitor C5 is grounded.

[0119] In one embodiment, the output end of the AC output circuit 102 is connected to the load through a diode D1 , a diode D2 , a capacitor C1 , and a resistor R1 .

[0120] In order to more clearly introduce the control method of the energy storage power supply in this application, Figure 7~Figure 10 Please refer to Figure 7~Figure 9 , by connecting a detection resistor 801 in series on the AC output side V1 of the energy storage power supply 100, collecting the voltage of the detection resistor 801, and using the sampling unit 802, the amplifying unit 803, the comparing unit 804 and the peak holding unit 805, the small-amplitude impact pulse signal accurately measured by the energy storage power supply 100 in a no-load state or a light-load state is converted into a power output signal that can be detected for a long time. In this way, it is beneficial to determine the load state of the energy storage power supply through the power output signal, and when the load state is a no-load state or a light-load state, the energy-saving mode circuit is switched in time to work, and it can also be suitable for portable outdoor and household energy storage power supplies based on a photovoltaic combined system.

[0121] Fig.10 FIG. 1 is a process diagram of a method for controlling an energy storage power supply in one embodiment. Fig.10 As shown, the processor can execute the control method according to the following process.

[0122] S1001, obtaining a power signal at an output end of an AC output circuit detected by a detection circuit.

[0123] S1002, determining that the power signal is an output power signal of an energy storage power supply.

[0124] S1003: Obtain a signal amplitude of an output power signal.

[0125] S1004: If the signal amplitude is within the preset amplitude range, it is determined that the load state of the energy storage power supply is a no-load state or a light-load state.

[0126] S1005, when the load state is a no-load state or a light-load state, control the first switch and the second switch to be disconnected from the normal mode circuit, and control the first switch and the second switch to be connected to the energy-saving mode circuit.

[0127] S1006: If the signal amplitude is not within the preset amplitude range, it is determined that the load state of the energy storage power supply is neither a no-load state nor a light-load state.

[0128] S1007, when the load state is neither in the no-load state nor in the light-load state, control the first switch and the second switch to be connected to the normal mode circuit, and control the first switch and the second switch to be disconnected from the energy-saving mode circuit.

[0129] The processes of S1001 to S1007 may refer to the above-mentioned embodiment and will not be described in detail here.

[0130] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0131] Based on the same inventive concept, the embodiment of the present application also provides a control device for implementing the above-mentioned energy storage power supply control method. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above-mentioned method, so the specific limitations in one or more control device embodiments provided below can refer to the above-mentioned limitations on the energy storage power supply control method, and will not be repeated here.

[0132] Fig.11 is a structural block diagram of a control device in an embodiment, which is applied to any of the above energy storage power supplies 110. In an exemplary embodiment, Fig.11 As shown, a control device 1100 is provided, comprising: a first determination module 1101 and a first control module 1102, wherein:

[0133] The first determination module 1101 is used to determine the load state of the energy storage power supply according to the output power signal of the energy storage power supply.

[0134] The first control module 1102 is used to control the normal mode circuit in the AC output circuit to stop working and control the energy-saving mode circuit in the AC output circuit to work when the load state is a no-load state or a light-load state; the switching loss ratio of the energy-saving mode circuit is less than the switching loss ratio of the normal mode circuit.

[0135] In the above-mentioned control device, since it is possible to determine the load state of the energy storage power supply according to the output power signal of the energy storage power supply, and when the load state is a no-load state or a light-load state, control the normal mode circuit in the AC output circuit to stop working, and control the energy-saving mode circuit in the AC output circuit to work, and the switching loss ratio of the energy-saving mode circuit is less than the switching loss ratio of the normal mode circuit, therefore, in the no-load state or the light-load state, the energy-saving mode circuit can reduce the switching loss ratio and improve the operating efficiency.

[0136] Optionally, the first determining module 1101 includes:

[0137] The acquisition unit is used to acquire the signal amplitude of the output power signal.

[0138] The determination unit is used to determine whether the load state of the energy storage power supply is a no-load state or a light-load state if the signal amplitude is within a preset amplitude range.

[0139] Optionally, the energy storage power supply also includes a switch unit, which is respectively connected to the normal mode circuit and the energy-saving mode circuit; the first control module 1102 is used to control the switch unit to be disconnected from the normal mode circuit, and to control the switch unit to be connected to the energy-saving mode circuit, so as to control the normal mode circuit to stop working, and control the energy-saving mode circuit in the AC output circuit to work.

[0140] Optionally, the switch unit includes a first switch and a second switch, the first switch is connected to the input end of the AC output circuit, and the second switch is connected to the output end of the AC output circuit; the first control module 1102 is used to control the first switch and the second switch to be disconnected from the normal mode circuit, and to control the first switch and the second switch to be connected to the energy-saving mode circuit.

[0141] Optionally, the energy storage power supply further includes a detection circuit, which is connected to the output end of the AC output circuit and the controller respectively; the control device 1100 includes:

[0142] The acquisition module is used to acquire the power signal of the output end of the AC output circuit detected by the detection circuit.

[0143] The second determination module is used to determine that the power signal is an output power signal of the energy storage power supply.

[0144] Optionally, the detection circuit includes a detection resistor, a sampling unit, an amplification unit, a comparison unit and a peak holding unit connected in sequence, the detection resistor is connected to the output end of the AC output circuit, and the peak holding unit is connected to the controller;

[0145] A sampling unit, used for obtaining a resistance voltage of a detection resistor;

[0146] an amplifying unit, used for amplifying the resistor voltage to obtain an amplified voltage;

[0147] A comparison unit, used to obtain a peak signal in a preset range in the amplified voltage;

[0148] The peak holding unit is used to maintain the peak value in the peak signal to obtain an output power signal.

[0149] Optionally, the control device 1100 further includes:

[0150] The second control module is used for controlling the energy-saving mode circuit to stop working and controlling the normal mode circuit to work when the load state is neither in the no-load state nor in the light-load state.

[0151] Optionally, the energy-saving mode circuit includes a first inverter module and a first transformer module connected to each other; the first inverter module is used to invert a first DC signal received at the input end of the AC output circuit into a first AC signal, and the first transformer module is used to boost the first AC signal to obtain an output power signal at the output end of the AC output circuit;

[0152] The normal mode circuit includes a second transformer module and a second inverter module connected to each other; the second transformer module is used to boost the first DC signal received at the input end of the AC output circuit to obtain a second DC signal, and the second inverter module is used to invert the second DC signal to obtain an output power signal at the output end of the AC output circuit.

[0153] Each module in the above control device can be implemented in whole or in part by software, hardware or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute operations corresponding to each module.

[0154] FIG12 is an internal structure diagram of a computer device in an embodiment. In an exemplary embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be shown in FIG12. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. Among them, the processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store relevant data. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a control method of an energy storage power supply is implemented.

[0155] Those skilled in the art will understand that the structure shown in FIG. 12 is merely a block diagram of a partial structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different arrangement of components.

[0156] In one embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above-mentioned method embodiments when executing the computer program.

[0157] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0158] In one embodiment, a computer program product is provided, including a computer program, which implements the steps in the above method embodiments when executed by a processor.

[0159] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, an artificial intelligence (AI) processor, etc., but are not limited to this.

[0160] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0161] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A method for controlling an energy storage power supply, characterized in that: A controller applied to the energy storage power supply, wherein the energy storage power supply comprises an AC output circuit, wherein the AC output circuit is connected to the controller, and the method comprises: Determining a load state of the energy storage power supply according to an output power signal of the energy storage power supply; When the load state is a no-load state or a light-load state, the normal mode circuit in the AC output circuit is controlled to stop working, and the energy-saving mode circuit in the AC output circuit is controlled to work; the switching loss ratio of the energy-saving mode circuit is less than the switching loss ratio of the normal mode circuit.

2. The control method according to claim 1, characterized in that: Determining the load state of the energy storage power supply according to the output power signal of the energy storage power supply includes: Acquiring a signal amplitude of the output power signal; If the signal amplitude is within the preset amplitude range, it is determined that the load state of the energy storage power supply is a no-load state or a light-load state.

3. The control method according to claim 1 or 2, characterized in that: The energy storage power supply further comprises a switch unit, wherein the switch unit is respectively connected to the normal mode circuit and the energy-saving mode circuit; The controlling the normal mode circuit in the AC output circuit to stop working and controlling the energy-saving mode circuit in the AC output circuit to work includes: The switch unit is controlled to be disconnected from the normal mode circuit, and the switch unit is controlled to be connected to the energy-saving mode circuit, so as to control the normal mode circuit to stop working and control the energy-saving mode circuit in the AC output circuit to work.

4. The control method according to claim 3, characterized in that: The switch unit includes a first switch and a second switch, the first switch is connected to the input end of the AC output circuit, and the second switch is connected to the output end of the AC output circuit; the control of disconnecting the switch unit from the normal mode circuit and controlling the switch unit to connect to the energy-saving mode circuit includes: The first switch and the second switch are controlled to be disconnected from the normal mode circuit, and the first switch and the second switch are controlled to be connected to the energy-saving mode circuit.

5. The control method according to claim 1 or 2, characterized in that: The energy storage power supply further comprises a detection circuit, which is connected to the output end of the AC output circuit and the controller respectively; Before determining the load state of the energy storage power supply, the method further includes: Acquiring a power signal of an output end of the AC output circuit detected by the detection circuit; Determine that the power signal is an output power signal of the energy storage power supply.

6. The control method according to claim 5, characterized in that: The detection circuit comprises a detection resistor, a sampling unit, an amplification unit, a comparison unit and a peak holding unit connected in sequence, the detection resistor is connected to the output end of the AC output circuit, and the peak holding unit is connected to the controller; The sampling unit is used to obtain the resistance voltage of the detection resistor; The amplifying unit is used to amplify the resistor voltage to obtain an amplified voltage; The comparison unit is used to obtain a peak signal of the amplified voltage that is within a preset range; The peak holding unit is used to maintain the peak value in the peak signal to obtain the output power signal.

7. The control method according to claim 1 or 2, characterized in that: The method further comprises: When the load state is neither a no-load state nor a light-load state, the energy-saving mode circuit is controlled to stop working, and the normal mode circuit is controlled to work.

8. The control method according to claim 1 or 2, characterized in that: The energy-saving mode circuit comprises a first inverter module and a first transformer module connected to each other; the first inverter module is used to invert a first DC signal received at the input end of the AC output circuit into a first AC signal, and the first transformer module is used to boost the first AC signal to obtain an output power signal at the output end of the AC output circuit; The normal mode circuit includes a second transformer module and a second inverter module connected to each other; the second transformer module is used to boost the first DC signal received at the input end of the AC output circuit to obtain a second DC signal, and the second inverter module is used to invert the second DC signal to obtain an output power signal at the output end of the AC output circuit.

9. A control device, characterized in that: Applied to an energy storage power supply, the energy storage power supply includes an AC output circuit; the control device includes: A first determining module, used to determine the load state of the energy storage power supply according to the output power signal of the energy storage power supply; The first control module is used to control the normal mode circuit in the AC output circuit to stop working and control the energy-saving mode circuit in the AC output circuit to work when the load state is a no-load state or a light-load state; the switching loss ratio of the energy-saving mode circuit is less than the switching loss ratio of the normal mode circuit.

10. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 8 are implemented.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 8 are implemented.

12. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 8 are implemented.

Images