Energy storage power supply control method, device, computer equipment, readable storage medium and program product

Abstract

The present application relates to a control method, apparatus, computer device, readable storage medium, and program product for an energy storage power supply, which is applied to a controller of the energy storage power supply. The energy storage power supply includes an AC output circuit connected to the controller. The method includes: determining the load state of the energy storage power supply based on an output power signal of the energy storage power supply, and when the load state is no-load or light-load, controlling the normal mode circuit in the AC output circuit to stop operating and controlling the energy-saving mode circuit in the AC output circuit to operate; the switching loss ratio of the energy-saving mode circuit is less than the switching loss ratio of the normal mode circuit. This method can reduce the switching loss ratio under no-load or light-load conditions.

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 known as energy storage devices) typically use multi-stage DC-AC conversion to power connected electrical devices. The switching devices in the multi-stage converter are always in operation, and the corresponding switching losses are constant, regardless of the load of the connected electrical device. Therefore, when the energy storage power supply is no-load or lightly loaded, the switching losses of the switching devices account for a large proportion, resulting in reduced operating efficiency of the energy storage power supply under no-load or light-load conditions. 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 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 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 no-load state or 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 the signal amplitude of the 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, wherein the switch unit is connected to the normal mode circuit and the energy-saving mode circuit respectively; 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 switch unit is controlled to be disconnected from the normal mode circuit and 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 embodiment, 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;

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

[0020] an amplifying unit, configured to amplify the resistor voltage to obtain an amplified voltage;

[0021] A comparison unit, configured to obtain a peak signal of the amplified voltage within a preset range;

[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 for use with an energy storage power supply, the energy storage power supply including an AC output circuit; the control device includes:

[0028] A first determining module 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;

[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, which 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, comprising a computer program, which implements the steps of any of the above methods when executed by a processor.

[0033] The above-mentioned energy storage power supply control method, device, computer equipment, readable storage medium and program product can determine the load state of the energy storage power supply based on the output power signal of the energy storage power supply, and when the load state is no-load or light-load, control the normal mode circuit in the AC output circuit to stop operating and control the energy-saving mode circuit in the AC output circuit to operate. 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 or light-load state, the energy-saving mode circuit can reduce the switching loss ratio and improve 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 following briefly introduces the drawings required for use in the embodiments of the present application or related technical descriptions. 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 any creative work.

[0035] Figure 1 A schematic diagram of the structure of an energy storage power supply in one embodiment;

[0036] Figure 2 1 is a 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 Schematic diagram of the structure of another energy storage power supply in one embodiment;

[0039] Figure 5 Schematic diagram of the structure of another energy storage power supply in one embodiment;

[0040] Figure 6 FIG1 is a schematic diagram of a process for determining an output power signal in one embodiment;

[0041] Figure 7 Schematic diagram of the structure of another energy storage power supply in one embodiment;

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

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

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

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

[0046] Figure 12 FIG. 1 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0048] Energy storage power supplies, such as outdoor solar-powered power supplies, primarily power household appliances. These range from medium- to heavy-load appliances like water heaters, air conditioners, and refrigerators to smaller, less-powerful devices like mobile phones and LED lights. The power requirements for these loads vary significantly, so the power supplied by energy storage power supplies fluctuates depending on the connected load.

[0049] Furthermore, when the energy storage power supply is no-load or lightly loaded, the switching losses of the switching devices account for a large proportion. On the one hand, this leads to a decrease in the operating efficiency of the energy storage power supply under no-load or light-load conditions, resulting in low energy utilization. On the other hand, the heat generated by the switching devices 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 described in detail below.

[0050] Figure 1 The structure diagram of the energy storage power supply in one embodiment is shown. The control method of the energy storage power supply provided in the embodiment of the present application can be applied to the following examples: Figure 1 In the application environment shown. Figure 1 As shown, 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] AC output circuit 102 is used to convert input current into the desired AC output. The input end of AC output circuit 102 can be connected to an energy storage battery. This energy storage battery can be placed inside energy storage power supply 100 or externally connected to energy storage power supply 100. This embodiment is not limited thereto.

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

[0054] S201: Determine the load state of the energy storage power supply according to the 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 or 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. 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. This embodiment is not limited to this.

[0057] Furthermore, the controller 101 can determine the load state of the energy storage power supply 100 based on the output power signal of the energy storage power supply 100. The load state of the energy storage power supply 100 can 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 can also be divided into two categories: one category indicates that the load state of the energy storage power supply 100 is a no-load state or a light-load state, and the other category indicates that the load state of the energy storage power supply 100 is neither a no-load state nor a 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. For example, 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 neither a no-load state nor a 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, 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; 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 Figure 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 operate at the same time. In other words, when the AC output circuit 102 is operating, only one of the normal mode circuit 1021 and the energy-saving mode circuit 1022 is operating at the same time.

[0061] The switching loss ratio of energy-saving mode circuit 1022 is smaller than that of normal mode circuit 1021. The switching loss ratio refers to the ratio of switching device losses to total losses. Switching devices include, but are not limited to, insulated gate bipolar transistors (IGBTs) and metal-oxide-semiconductor field-effect transistors (MOSFETs). In other words, the ratio of switching device losses to total losses in energy-saving mode circuit 1022 is smaller than that in normal mode circuit 1021.

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

[0064] Optionally, the controller 101 can control the operation of the normal mode circuit 1021 or the energy-saving mode circuit 1022 in the AC output circuit 102 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 operates and the normal mode circuit 1021 stops operating; when the controller 101 sends a control signal B to the AC output circuit 102, the energy-saving mode circuit 1022 stops operating and the normal mode circuit 1021 operates.

[0065] In the above-mentioned control method of the energy storage power supply, since the load state of the energy storage power supply can be determined based on 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 operating, and the energy-saving mode circuit in the AC output circuit is controlled to operate, 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 a no-load state nor in a light-load state, the controller 100 controls the energy-saving mode circuit 1022 to stop operating and controls the normal mode circuit 1021 to operate. In other words, the controller 101 switches the AC output circuit 102 from operating in the energy-saving mode circuit 1022 to operating 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 one embodiment. In an exemplary embodiment, as shown in FIG. Figure 3 As shown, S201 includes S301 to S302.

[0071] S301: Acquire the signal amplitude of the 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 amplitude corresponding to different time points may be different.

[0073] S302: 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.

[0074] In this embodiment, the controller 101 determines whether the load state of the energy storage power supply is no-load or light-load by whether the signal amplitude falls within a preset amplitude range. The preset amplitude range can be set as required, 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 will be understood that when the signal amplitude of the output power signal is not within the preset amplitude range, the controller 101 may determine that the load state of the energy storage power supply is neither a no-load state nor a 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, 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 structural diagram of another energy storage power supply in an embodiment, such as 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 as follows:

[0078] The switch unit is controlled to be disconnected from the normal mode circuit and 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 disconnect from the normal mode circuit 1021 and controls the switch unit 400 to connect 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 connects the path between the control switch unit 400 and the energy-saving mode circuit 1022. In this way, the normal mode circuit 1021 can be controlled to stop operating and the energy-saving mode circuit 1022 can be controlled to operate.

[0080] It is understood that if the load state is neither a no-load state nor a light-load state, the controller 101 controls the switch unit 400 to connect to the normal mode circuit 1021 and controls the switch unit 400 to disconnect from the energy-saving mode circuit 1022. In other words, the controller 101 controls the path between the switch unit 400 and the normal mode circuit 1021 to be turned on and the path between the switch unit 400 and the energy-saving mode circuit 1022 to be turned off. In this way, the normal mode circuit 1021 can be controlled to operate and the energy-saving mode circuit 1022 can be controlled to stop operating.

[0081] In the above 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. 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 operate 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 DC, and the output end of the AC output circuit 102 is used to output AC. That is, the first switch 401 is a DC-side switch, and the second switch 402 is an AC-side switch.

[0083] Furthermore, the above-mentioned “controlling the switch unit to disconnect from the normal mode circuit and controlling the switch unit to connect 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 disconnected, thereby controlling the normal mode circuit 1021 to stop working and controlling the energy-saving mode circuit 1022 to operate.

[0086] It can be understood that if the load state is neither a no-load state nor 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 operate and controlling the energy-saving mode circuit 1022 to stop operating.

[0087] In the above embodiment, since the switching 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 structural diagram of another energy storage power supply in an embodiment, such as Figure 5 As shown, in an exemplary embodiment, the energy storage power supply 100 optionally 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 from the output end of the AC output circuit 102.

[0089] Figure 6 2 is a flow chart of determining an output power signal in an embodiment. Before S201 , the control method further includes S601 to S602 .

[0090] S601: Acquire a power signal at an output end of an AC output circuit detected by a detection circuit.

[0091] In this embodiment, after acquiring the power signal from 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 the 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 further 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 at 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 structural diagram of another energy storage power supply in an embodiment, such as 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 configured to invert a first DC signal received at the input of the AC output circuit 102 into a first AC signal, and the first transformer module 1022b is configured to boost the first AC signal to obtain an output power signal at the output of the AC output circuit 102. In other words, the energy-saving mode circuit 1022 inverts the DC input of the AC output circuit 102 into AC, and then boosts the AC voltage for output.

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

[0098] Normal mode circuit 1021 includes a second transformer module 1021a and a second inverter module 1021b, which are interconnected. Second transformer module 1021a is used to boost the first DC signal received at the input of AC output circuit 102 to generate a second DC signal, while second inverter module 1021b is used to invert the second DC signal into an output power signal at the output of AC output circuit 102. In other words, normal mode circuit 1021 first inverts the DC input of AC output circuit 102 into AC, then boosts the AC voltage for output.

[0099] Exemplarily, the second voltage transformation 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 further include other devices. For example, the normal mode circuit 1021 may further include an LLC resonant converter disposed between the input of the AC output circuit 102 and the second voltage transformation module 1021a.

[0100] In the above-mentioned embodiment, since the normal mode circuit boosts the voltage on the AC side, and AC-side boosting is typically achieved by turning switching devices on and off, significant switching losses are generated. These switching losses are independent of load size. Therefore, under low load conditions, i.e., no-load or light-load conditions, the energy storage power supply's energy transfer efficiency is low, and operating efficiency decreases. The energy-saving mode circuit, on the other hand, does not boost the voltage on the AC side, but rather on the DC side. This requires fewer switching devices than AC-side boosting, thus reducing operating losses and achieving energy savings under no-load or light-load conditions.

[0101] In one embodiment, please 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 configured 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 grid to connect to a 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 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 configured 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 operating and controls the energy-saving mode circuit in the AC output circuit to operate; and when the load state is neither a no-load state nor a light-load state, controls the energy-saving mode circuit to stop operating and controls the normal mode circuit to operate.

[0104] Currently, energy storage power supplies output relatively low AC currents in no-load or light-load states, typically in the milliampere range. This makes it difficult for current transformers or Hall sensors to accurately measure this AC current. Furthermore, the AC current waveform is not a sinusoidal wave, but rather a pulse-like signal, which cannot meet the requirements of analog-to-digital conversion. Therefore, this embodiment provides a detection circuit that facilitates obtaining an output power signal.

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

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

[0107] In this embodiment, when in a no-load or light-load state, the load of the energy storage power supply 100 is relatively small, and the AC current output by the energy storage power supply 100 is difficult to accurately measure, resulting in a large error. Therefore, the sampling unit 803 obtains 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 lightly 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 configured to amplify the resistor voltage obtained by the sampling unit 803 to obtain an amplified voltage. The amplification factor of the resistor voltage can be set according to actual needs and is not limited in this embodiment.

[0109] The comparison unit 804 is used to obtain a peak signal of the amplified voltage within a preset range. In this embodiment, under light load or no-load conditions, the energy storage power supply 100 outputs a small-amplitude impulse-type pulse signal, and thus the amplified voltage is also an impulse-type pulse signal. Figure 9 This is a schematic diagram of a signal in an embodiment. The impact type pulse signal can refer to Figure 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 of 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. If the amplitude of the voltage signal is less than the preset value, the amplitude is maintained unchanged. If the amplitude of the voltage signal is not less than the preset value, the comparison unit 804 outputs 0. In some embodiments, if the amplitude of the voltage signal is greater than the preset value, the amplitude is maintained unchanged. If the amplitude of the voltage signal is not greater than the preset value, the comparison unit 804 outputs 0. The preset voltage may be 0.

[0112] Exemplarily, the comparison unit 804 outputs 0 when the amplitude of the amplified signal with 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 and obtain the 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 Figure 9 Figure (b) in .

[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. Finally, the peak value in the peak signal is maintained by the peak holding unit, and 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 of the detection resistor 801, if the resistance 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 of the detection resistor 801 is less than or equal to a preset resistance threshold. The preset resistance threshold can be a value close to 0, for example, the preset resistance threshold can be 0.1 ohms.

[0116] Please continue to refer to Figure 8In 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, which 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 terminal of the differential comparator U1A; the first end of the DC power supply V3 is connected to the positive power supply terminal of the differential comparator U1A; and the second end of the DC power supply V3 is grounded. The negative power supply terminal of the differential comparator U1A is grounded, and the output terminal of the differential comparator U1A is connected to the resistor R6.

[0118] Optionally, the peak hold 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 further 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 a load via 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, Figures 7 to 10 Please refer to Figures 7 to 9By connecting a detection resistor 801 in series to the AC output side V1 of the energy storage power supply 100, the voltage of the detection resistor 801 is collected, and 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 through a sampling unit 802, an amplification unit 803, a comparison unit 804 and a peak holding unit 805. This is conducive to determining the load state of the energy storage power supply through the power output signal, and when the load state is no-load or light-load, the energy-saving mode circuit operation is switched in time. It is also suitable for portable outdoor and household energy storage power supplies based on a photovoltaic energy storage combined system.

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

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

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

[0124] S1003: Acquire the signal amplitude of the output power signal.

[0125] S1004: If the signal amplitude is within the preset amplitude range, determine 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, 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.

[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 a no-load state nor a light-load state, controlling the first switch and the second switch to be connected to the normal mode circuit, and controlling 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 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 various embodiments described above are displayed in sequence according to the instructions of the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the flowcharts involved in the various embodiments described above can include multiple steps or multiple stages, and these steps or stages are not necessarily executed and completed 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 portion of steps or stages in other steps.

[0131] Based on the same inventive concept, embodiments of the present application further provide a control device for implementing the aforementioned method for controlling an energy storage power supply. The solution provided by this device is similar to the solution described in the aforementioned method. Therefore, the specific limitations of one or more control device embodiments provided below can be found in the aforementioned definition of the method for controlling an energy storage power supply, and will not be further elaborated here.

[0132] Figure 11 FIG. 1 is a 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, as shown in FIG. Figure 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 determining module 1101 is configured to determine a load state of the energy storage power supply according to an 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 based on 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 operating, and the energy-saving mode circuit in the AC output circuit is controlled to operate, 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 switching loss ratio can be reduced by the energy-saving mode circuit, thereby improving operating efficiency.

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

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

[0138] The determining unit is configured 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 switching 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 switching unit to be disconnected from the normal mode circuit, and to control the switching 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 switching 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 determining 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 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;

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

[0146] an amplifying unit, configured to amplify the resistor voltage to obtain an amplified voltage;

[0147] A comparison unit, configured to obtain a peak signal of the amplified voltage within a preset range;

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

[0154] Figure 12 This is an internal structure diagram of a computer device in an embodiment. In an exemplary embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as follows: Figure 12 As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, abbreviated as I / O) and a communication interface. The processor, memory and input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. 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 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 for an energy storage power supply is implemented.

[0155] Those skilled in the art will understand that Figure 12The structure shown in the figure is only a block diagram of a part of the 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 component arrangement.

[0156] In one embodiment, a computer device is provided, including a memory and a processor. The memory stores a computer program, and the processor implements the steps in the above 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] Those skilled in the art will understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. 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. In particular, any reference to memory, database, or other media used in the embodiments provided in this 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. By way of illustration and not limitation, RAM can take various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The databases involved in the various embodiments provided herein may include at least one of a relational database and a non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the various embodiments provided herein may be, but are not limited to, general-purpose processors, central processing units (CPUs), graphics processing units (GPUs), digital signal processors (DSPs), programmable logic devices (PLDs), quantum computing-based data processing logic devices, artificial intelligence (AI) processors, and the like.

[0160] The technical features of the above embodiments can be combined arbitrarily. In order 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 merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended 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 includes an AC output circuit, and the AC output circuit is connected to the controller, and the method includes: 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; 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; 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 into an output power signal at the output end of the AC output 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 includes 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 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 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: Acquiring a power signal at the output end of the AC output circuit detected by the detection circuit; Determine that the power signal is the output power signal of the energy storage power supply.

6. The control method according to claim 5, characterized in that: 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; 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 configured 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. A control device, characterized in that: Applicable to an energy storage power supply, the energy storage power supply includes an AC output circuit; the control device includes: A first determining module is configured to determine a load state of the energy storage power supply according to an output power signal of the energy storage power supply; a first control module, configured to control a normal mode circuit in the AC output circuit to stop operating and control an energy-saving mode circuit in the AC output circuit to operate when the load state is a no-load state or a light-load state; a switching loss ratio of the energy-saving mode circuit is less than a switching loss ratio of the normal mode circuit; 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; 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 into an output power signal at the output end of the AC output circuit.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

10. 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 7 are implemented.

11. 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 7 are implemented.

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