Inverter output control method, inverter and energy storage power supply

Abstract

The application provides an inverter output control method, an inverter and an energy storage power supply. The method comprises the following steps: an inverter master control module determines a target response mode, and determines a target control module from a power control module; when the target response mode is a fast response mode, a current conversion module of the inverter is in a power output opening state, and the target control module controls a power output state of an inverter module according to a load detection result, so as to control the output of the inverter; when the target response mode is a low idle response mode, the target control module controls the power output state of the current conversion module and the inverter module of the inverter according to the load detection result, so as to control the output of the inverter. According to the preset target response mode, at least part of the power module can be closed and the external output can be closed when there is no external load, so as to reduce the idle loss and prolong the standby endurance. Meanwhile, the electric shock and the electric shock caused by the output end when the load is connected can be avoided, and the electric safety can be improved.

Description

Technical Field

[0001] This application relates to the field of inverter technology, specifically to an inverter output control method, an inverter, and an energy storage power supply. Background Technology

[0002] An inverter is a power electronic device that converts direct current (DC) power into alternating current (AC) power, and it is widely used in portable energy storage power supplies and emergency power supply equipment. In practical applications, inverters often remain in an idle standby state for extended periods without any load connected and without any external power output.

[0003] However, many inverters currently remain in standby mode even when there is no load connected and no power output is being output. This will continue to consume power, resulting in high no-load losses and affecting the equipment's endurance. In addition, when the inverter is connected to electrical equipment that is in a conducting state, it is very easy to generate an electric arc at the moment of connection, which poses a safety risk of sparking and electric shock. Summary of the Invention

[0004] This application provides an inverter output control method, an inverter, and an energy storage power supply, which can achieve both fast response and reduced no-load standby power consumption, thereby at least partially solving the above-mentioned technical problems.

[0005] In a first aspect, an inverter output control method is provided, wherein the inverter includes a main control module, a power control module, a converter module, and an inverter module, and the method includes: The main control module determines the target response mode and target control module of the inverter; wherein, the target control module is a control module determined from the power control module; When the target response mode is fast response mode, the converter module is in the power output on state, and the target control module controls the power output state of the inverter module according to the load detection result, so as to control the output of the inverter. When the target response mode is the low no-load response mode, the target control module controls the power output state of the converter module and the inverter module according to the load detection result, so as to control the output of the inverter; wherein, the power output state includes the power output on state and the power output off state.

[0006] Secondly, an inverter is also provided for performing the inverter output control method described above.

[0007] Thirdly, an energy storage power source is also provided, including a battery and an inverter as described above, wherein the inverter is connected to the battery.

[0008] The inverter output control method provided in this application embodiment can at least partially shut down the inverter's power module and turn off the inverter's external output when there is no external load, according to a preset target response mode. This significantly reduces the no-load loss of the whole machine, reduces the energy consumption of energy storage, and effectively extends the standby life of the equipment. At the same time, it avoids the arcing and electric shock problems caused by the inverter output being energized for a long time when a live load is connected, thus improving the electrical safety of the inverter. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is a schematic flowchart of the first inverter output control method provided in an exemplary embodiment of this disclosure; Figure 2 This is a second flowchart illustrating the inverter output control method provided in an exemplary embodiment of this disclosure; Figure 3 This is a third flowchart illustrating the inverter output control method provided in an exemplary embodiment of this disclosure; Figure 4 This is a schematic block diagram of the load detection module provided in an exemplary embodiment of this disclosure; Figure 5 This is a first schematic diagram of the load detection module provided in an exemplary embodiment of this disclosure; Figure 6 This is a second schematic diagram of the load detection module provided in an exemplary embodiment of this disclosure; Figure 7 This is a third schematic diagram of the load detection module provided in the exemplary embodiments of this disclosure; Figure 8 This is a fourth schematic diagram of the load detection module provided in the exemplary embodiments of this disclosure; Figure 9 This is a fifth schematic diagram of the load detection module provided in the exemplary embodiments of this disclosure; Figure 10 This is a sixth schematic diagram of the load detection module provided in the exemplary embodiments of this disclosure; Figure 11 This is the seventh schematic diagram of the load detection module provided in the exemplary embodiments of this disclosure; Figure 12 This is a schematic block diagram of an inverter provided by an exemplary embodiment of this disclosure; Figure 13 This is a circuit diagram of an inverter provided in an exemplary embodiment of this disclosure; Figure 14 This is a schematic diagram of the structure of an energy storage power source provided by an exemplary embodiment of this disclosure. Detailed Implementation

[0011] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0012] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0013] "A and / or B" includes the following three combinations: A only, B only, and a combination of A and B.

[0014] The use of "applies to" or "configured to" in this application implies open and inclusive language, which does not exclude the applicability to or configuration to devices performing additional tasks or steps. Additionally, the use of "based on" implies openness and inclusivity, because processes, steps, calculations, or other actions "based on" one or more of the stated conditions or values ​​may in practice be based on additional conditions or values ​​beyond those stated.

[0015] In this application, the term "exemplary" is used to mean "used as an example, illustration, or description." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use this application. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that this application can be made without using these specific details. In other instances, well-known structures and processes are not described in detail to avoid obscuring the description of this application with unnecessary detail. Therefore, this application is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0016] Please refer to Figure 1This application provides an inverter output control method, wherein the inverter includes a main control module, a converter module, an inverter module, and a power control module. The inverter output control method includes at least the following steps: Step S101: The main control module determines the target response mode and target control module of the inverter.

[0017] The target response mode and the target control module are both pre-configured information that the inverter has set before leaving the factory. The target response mode is either a fast response mode or a low no-load response mode; the target control module is a control module determined from the power control module.

[0018] Specifically, the main control module can determine the target response mode and target control module for each inverter by querying the inverter's preset configuration information.

[0019] In step S102, when the target response mode is fast response mode, the converter module is in the power output on state, and the target control module controls the power output state of the inverter module according to the load detection result, so as to control the output of the inverter.

[0020] Step S103: When the target response mode is the low no-load response mode, the target control module controls the power output state of the converter module and the inverter module according to the load detection result, so as to control the output of the inverter.

[0021] The power output status includes power output on state and power output off state. The converter module and inverter module are the power modules in the inverter.

[0022] In this embodiment, the converter module is connected to the power control module and is used to convert the DC input voltage into a DC bus voltage in response to the control of the power control module. Exemplarily, the converter module may include a DC H-bridge and a transformer. By receiving the PWM drive signal output by the power control module, the switching transistors of the DC H-bridge are controlled to alternately conduct, converting the battery voltage into a DC bus voltage via the transformer. The converter module may also be implemented using other DC-DC conversion circuits; this embodiment does not limit this. It is understood that, depending on the type of inverter, the converter module may be a boost converter module or a buck converter module; this application does not limit this.

[0023] In this embodiment, the inverter module is connected to the converter module and the power control module. It responds to the control of the power control module by converting the DC bus voltage output by the converter module into an AC output voltage, which is then supplied to an external load via the AC output terminal. Exemplarily, the inverter module may include an INV H-bridge, which controls the switching transistors of the inverter bridge by receiving a PWM drive signal from the power control module to convert the DC bus voltage into AC output. The inverter module can also be implemented using other DC-AC conversion circuits; this embodiment does not limit its implementation.

[0024] In this embodiment, the power control module is connected to the main control module. The target control module in the power control module is used to control the power output state of the converter module and the inverter module according to the load detection results and the target response mode and target control module determined by the main control module, thereby controlling the output of the inverter.

[0025] Specifically, after the inverter is powered on and initialized, the main control module first determines the target response mode and target control module corresponding to the inverter. When the target response mode is fast response mode, the main control module first sends an isolation communication signal to the power control module to control the converter module to enter the power output on state and convert the battery voltage to the DC bus voltage. Then, the target control module determines the load detection result and controls the power output state of the inverter module according to the load detection result, thereby controlling the output of the inverter. When the target response mode is low no-load response mode, the target control module first determines the load detection result, and then controls the power output state of the converter module and the inverter module according to the load detection result, thereby controlling the output of the inverter.

[0026] Understandably, the inverter needs to complete the above steps once during each power-on initialization. Then, before shutting down the inverter, it only needs to repeat the steps of determining the load detection result and subsequent steps based on the inverter's load connection status. Specifically, when the target response mode is fast response mode, the target control module repeatedly controls the power output state of the inverter module based on the load detection result to control the inverter's output; when the target response mode is low no-load response mode, the target control module repeatedly controls the power output state of the converter module and inverter module based on the load detection result to control the inverter's output.

[0027] Specifically, when the load detection result changes, the system switches between power output on and power output off states; when the load detection result remains unchanged, the current power output state is maintained. When it is necessary to control a power module to enter the power output on state, a PWM signal is sent to that power module; when it is necessary to control a power module to enter the power output off state, the sending of PWM signals to that power module is stopped.

[0028] This application embodiment uses a preset target response mode and a target control module. The target control module then coordinates the inverter's output based on the target response mode and load detection results. In fast response mode, the converter module continuously maintains its power output on, and the target control module only needs to control the power output state of the inverter module to control the inverter's output based on the load detection results. In low no-load response mode, the target control module simultaneously controls the power output states of both the converter module and the inverter module based on the load detection results, thereby controlling the inverter's output. Therefore, when there is no external load, the converter module and the inverter module can be at least partially shut down, and the inverter's external output can be turned off. This significantly reduces the overall no-load loss, reduces energy storage power consumption, and effectively extends the equipment's standby time. Simultaneously, it avoids arcing and electric shock problems caused by the inverter output being constantly energized when a conductive load is connected, improving the inverter's electrical safety.

[0029] In some embodiments, the power control module includes a converter control module and an inverter control module. The converter control module controls the power output state of the converter module, and the inverter control module controls the power output state of the inverter module. Bidirectional signal transmission can be performed between the converter control module and the inverter control module, as well as between the converter control module and the main control module, via an isolated communication interface. Transmitting communication signals through the isolated communication interface achieves electrical isolation and signal sharing, improving the safety and reliability of the control.

[0030] In some embodiments, step S102 may include steps S1021 to S1025, specifically: Step S1021: When the target response mode is fast response mode, the converter control module controls the converter module to be in the power output on state.

[0031] Specifically, when the target response mode is fast response mode and the target control module is a converter control module, the converter control module first sends a PWM signal to the converter module to control the converter module to be in the power output on state, and establishes and maintains the DC bus voltage.

[0032] Step S1022: If the target control module is a converter control module, the converter control module determines the load detection result.

[0033] In step S1023, the converter control module sends a communication signal to the inverter control module based on the load detection result to control the power output state of the inverter module, thereby controlling the output of the inverter.

[0034] Specifically, if the target control module is a converter control module, the converter control module acquires the load detection signal and determines the load detection result based on the acquired load detection signal. Then, it transmits the communication signal representing the load detection result to the inverter control module through an isolated communication interface, so that the inverter control module sends / stops sending PWM signals to the inverter module according to the received communication signal, thereby controlling the power output state of the inverter module and thus controlling the output of the inverter.

[0035] Furthermore, the communication signals may include a first communication signal representing a connected load and a second communication signal representing a non-connected load. The inverter control module then controls the power output state of the inverter module based on the received first or second communication signal, thereby controlling the inverter's output. If the converter control module detects a connected load, it sends the first communication signal to the inverter control module. The inverter control module, based on the received first communication signal, controls the inverter module to be in a power output on state, enabling the inverter to output power. If the converter control module detects a non-connected load, it sends the second communication signal to the inverter control module. The inverter control module, based on the received second communication signal, controls the inverter module to be in a power output off state, disabling the inverter's external output.

[0036] Specifically, if the target response mode is fast response mode, the converter control module will first drive the converter module to start power output. If the target control module is the converter control module, when the converter control module detects a connected load, it sends a first communication signal to the inverter control module through the isolated communication interface. The inverter control module then sends a PWM signal to the inverter module based on the received first communication signal to control the inverter module to start power output, enabling the inverter to output electrical energy. When the converter control module detects no connected load, it sends a second communication signal to the inverter control module through the isolated communication interface. The inverter control module then stops sending PWM signals to the inverter module based on the second communication signal to control the inverter module to shut down power output, thereby cutting off the inverter's external power output.

[0037] Step S1024: If the target control module is an inverter control module, the inverter control module determines the load detection result.

[0038] In step S1025, the inverter control module controls the power output state of the inverter module according to the load detection result, thereby controlling the output of the inverter.

[0039] Specifically, if the target control module is an inverter control module, then the inverter control module collects load detection signals, determines the load detection result based on the collected load detection signals, and controls the power output state of the inverter module according to the load detection result, thereby controlling the output of the inverter. If the inverter control module detects a connected load, it controls the inverter module to be in the power output on state, enabling the inverter to output externally; if the inverter control module detects no connected load, it controls the inverter module to be in the power output off state, disabling the inverter's external output.

[0040] In other words, if the target response mode is fast response mode, the target control module is the inverter control module, and the converter control module has already driven the converter module to start power output, when the inverter control module detects a connected load, the inverter control module sends a PWM signal to the inverter module to control the inverter module to start power output, so that the inverter outputs electrical energy to the outside; when the inverter control module detects no connected load, the inverter control module stops sending PWM signals to the inverter module to control the inverter module to turn off power output, thereby cutting off the inverter's external power output.

[0041] In this configuration, the inverter control module acts as the target control module, responsible for both acquiring load detection results and directly controlling the inverter module. The detection and control entities are integrated, eliminating the need to send communication signals to other control modules through isolated communication interfaces, thus minimizing the signal processing path.

[0042] In this embodiment, the inverter output control method corresponding to the inverter adopting fast response mode is described in the following example. Figure 2 It is understood that, in the embodiments of this application, the "first communication signal" corresponds to the communication signal representing the connected load, and the "second communication signal" corresponds to the communication signal representing the unconnected load. The communication signals are transmitted through the isolated communication interface between the converter control module and the inverter control module.

[0043] Figure 2 The process shown corresponds to steps S1021 to S1025 above. Specifically, after the inverter is powered on and initialized, the main control module determines that the target response mode of the inverter is fast response mode and determines the target control module. Then, the converter control module controls the converter module to be in the power output on state so that the converter module continuously builds up and maintains the DC bus voltage. After that, the specific inverter output control method is determined based on the target control module.

[0044] If the target control module is a converter control module ( Figure 2(For the left branch), the load detection result is determined by the converter control module. When the converter control module detects an connected load, it sends a first communication signal to the inverter control module; the inverter control module, based on the received first communication signal, controls the inverter module to be in the power output on state, enabling the inverter to output power externally. When the converter control module detects no connected load, it sends a second communication signal to the inverter control module; the inverter control module, based on the received second communication signal, controls the inverter module to be in the power output off state, disabling the inverter's external output.

[0045] If the target control module is an inverter control module ( Figure 2 (On the right branch), the load detection result is determined by the inverter control module. When the inverter control module detects a connected load, it controls the inverter to be in the power output on state, enabling the inverter to output power to the outside. When the inverter control module detects no connected load, it controls the inverter to be in the power output off state, disabling the inverter's external output.

[0046] Understandably, this solution detects whether the inverter is connected to a load in real time and controls the inverter's output accordingly. When the load detection result changes, the inverter switches between enabling and disabling external output through the aforementioned steps; when the load detection result remains unchanged, the inverter maintains its current external output state.

[0047] In this embodiment, when the inverter adopts a fast response mode, the converter module remains in the power output on state. When a load is detected, simply controlling the inverter module to be in the power output on state is sufficient to start the inverter's external output, eliminating the waiting time for re-establishing the DC bus voltage each time, resulting in a fast response speed. When no load is detected, the inverter module is in the power output off state. By partially shutting down the power modules in the inverter, the inverter's no-load power consumption is reduced. Simultaneously, the inverter module is in the power output off state before a load is connected, ensuring that the inverter output is not energized before the load is connected, thus avoiding the risk of arcing and electric shock when connected to a energized load.

[0048] In some embodiments, step S103 may include steps S1031 to S1034, specifically: Step S1031: When the target response mode is low no-load response mode and the target control module is a converter control module, the converter control module determines the load detection result.

[0049] In step S1032, the converter control module controls the power output state of the converter module and the inverter module according to the load detection result, so as to control the output of the inverter.

[0050] Specifically, when the target response mode is the low no-load response mode and the target control module is the converter control module, the converter control module collects the load detection signal in real time and determines the load detection result based on the collected load detection signal. Then, the converter control module can directly control the converter module according to the load detection result, and indirectly control the inverter module by transmitting the communication signal representing the load detection result to the inverter control module through the isolated communication interface.

[0051] Furthermore, the communication signals include a first communication signal representing a connected load and a second communication signal representing a non-connected load. The inverter control module can then control the power output state of the inverter module based on the received first or second communication signal, thereby controlling the inverter's output. If the converter control module detects a connected load, it controls the converter module to be in the power output on state and sends the first communication signal to the inverter control module. The inverter control module, based on the received first communication signal, controls the inverter module to be in the power output on state, enabling the inverter to output power externally. If the converter control module detects a non-connected load, it sends the second communication signal to the inverter control module. The inverter control module, based on the received second communication signal, controls the inverter module to be in the power output off state, disabling the inverter's external output.

[0052] Specifically, if the target response mode is a low no-load response mode and the target control module is a converter control module, when the converter control module detects a connected load, it sends a PWM signal to the converter module to control the converter module to start power output and obtain DC bus voltage. At the same time, it sends a first communication signal to the inverter control module. The inverter control module outputs a PWM signal to the inverter module based on the received first communication signal to control the inverter module to start power output, thereby enabling the inverter to output power externally. If the converter control module detects no connected load, it first sends a second communication signal to the inverter control module. Based on the second communication signal, the inverter control module stops sending PWM signals to the inverter module to control the inverter module to shut down power output, thereby cutting off the inverter's external power output. After that, the converter control module stops sending PWM signals to the converter module to control the converter module to shut down power output.

[0053] In this configuration, when the load detection result indicates that a load is connected, the converter control module first starts the converter module, and then notifies the inverter control module to start the inverter module through the first communication signal so that the inverter can output to the outside; when the load detection result indicates that no load is connected, the converter control module first notifies the inverter control module to shut down the inverter module through the second communication signal to shut down the inverter's output to the outside, and then shuts down the converter module.

[0054] Step S1033: When the target response mode is low no-load response mode and the target control module is inverter control module, the inverter control module determines the load detection result.

[0055] In step S1034, the inverter control module controls the power output state of the converter module and the inverter module according to the load detection result, so as to control the output of the inverter.

[0056] Specifically, when the target response mode is a low-load response mode and the target control module is an inverter control module, the inverter control module acquires the load detection signal and determines the load detection result based on the acquired load detection signal. Then, the inverter control module can directly control the inverter module according to the load detection result, and indirectly control the converter module by transmitting the communication signal representing the load detection result to the converter control module through an isolated communication interface.

[0057] Furthermore, the communication signals include a first communication signal representing a connected load and a second communication signal representing a non-connected load. The converter control module can then control the power output state of the converter module based on the received first or second communication signal, thereby controlling the inverter's output. If the inverter control module detects a connected load, it sends the first communication signal to the converter control module, which then controls the converter module to be in a power output on state, enabling the inverter to output power externally. Conversely, if the inverter control module detects a non-connected load, it controls the inverter module to be in a power output off state, disabling the inverter's external output. The inverter control module then sends the second communication signal to the converter control module, which then controls the converter module to be in a power output off state.

[0058] Specifically, if the target response mode is a low no-load response mode and the target control module is an inverter control module, when the inverter control module detects a connected load, it first sends a first communication signal to the converter control module through the isolated communication interface. The converter control module then outputs a PWM signal to the converter module based on the received first communication signal to control the converter module to start power output and obtain DC bus voltage. Then, the inverter control module sends a PWM signal to the inverter module to control the inverter module to start power output, thereby enabling the inverter to output power externally. If the inverter control module detects no connected load, it first stops sending PWM signals to the inverter module to control the inverter module to shut down power output, thereby cutting off the inverter's external power output. Afterward, the inverter control module sends a second communication signal to the converter control module through the isolated communication interface, causing the converter control module to stop sending PWM signals to the converter module based on the received second communication signal to control the converter module to shut down power output.

[0059] In this configuration, when the load detection result indicates that a load is connected, the inverter control module first notifies the converter control module to start the converter module through the first communication signal, and then starts the inverter module to enable the inverter to output to the outside; when the load detection result indicates that no load is connected, the inverter control module first shuts down the inverter module to shut down the inverter's external output, and then notifies the converter control module to shut down the converter module through the second communication signal.

[0060] In this embodiment, the inverter output control method corresponding to the low no-load response mode of the inverter is referred to. Figure 3 It is understood that, in the embodiments of this application, the "first communication signal" corresponds to the communication signal representing the connected load, and the "second communication signal" corresponds to the communication signal representing the unconnected load. The communication signals are transmitted through the isolated communication interface between the converter control module and the inverter control module.

[0061] Figure 3 The process shown corresponds to steps S1031 to S1034 above. Specifically, after the inverter is powered on and initialized, the main control module determines that the target response mode of the inverter is the low no-load response mode and determines the target control module.

[0062] If the target control module is a converter control module ( Figure 3 (Left branch) The load detection result is determined by the converter control module. When the converter control module detects a connected load, it controls the converter module to be in the power output on state and sends a first communication signal to the inverter control module; the inverter control module, based on the received first communication signal, controls the inverter module to be in the power output on state, enabling the inverter to output externally. When the converter control module detects no connected load, it sends a second communication signal to the inverter control module; the inverter control module, based on the received second communication signal, controls the inverter module to be in the power output off state, disabling the inverter's external output; the converter control module controls the converter module to be in the power output off state.

[0063] If the target control module is an inverter control module ( Figure 3 (On the right branch), the load detection result is determined by the inverter control module. When the inverter control module detects a connected load, it sends a first communication signal to the converter control module; the converter control module controls the converter module to be in the power output on state based on the received first communication signal; the inverter control module controls the inverter module to be in the power output on state, enabling the inverter to output externally. When the inverter control module detects no connected load, it controls the inverter module to be in the power output off state, disabling the inverter's external output; the inverter control module sends a second communication signal to the converter control module; the converter control module controls the converter module to be in the power output off state based on the received second communication signal.

[0064] Understandably, this solution detects whether the inverter is connected to a load in real time and controls the inverter's output accordingly. When the load detection result changes, the inverter switches between enabling and disabling external output through the aforementioned steps; when the load detection result remains unchanged, the inverter maintains its current external output state.

[0065] In this embodiment, under low no-load response mode, both the inverter module and the converter module are in a power output off state when no load is connected, meaning the inverter's power module is completely shut down, significantly reducing the inverter's no-load power consumption. Furthermore, shutting down the inverter module first when no load is connected prevents the inverter from outputting power, and then shutting down the converter module shortens the inverter's response time for shutting off external output. In addition, the inverter module is in a power output off state before the inverter connects to a load, ensuring the inverter output is not energized before the load is connected, thus avoiding the risk of arcing and electric shock when connected to a energized load.

[0066] In some embodiments, the inverter further includes a load detection module, which is connected to the target control module in the power control module and is used to detect the load connection status at the AC output terminal of the inverter. The target control module can determine the load detection result through the load detection module.

[0067] Furthermore, in order to better control the inverter output, such as... Figure 4 As shown, the load detection module 20 may include a load detection unit 21 and a switching unit 22. The switching unit 22 includes a main output switch 221 and a sampling control switch 222.

[0068] The switching unit 22 has a control terminal for receiving control signals. In response to the received control signals, the switching unit 22 switches the main output switch 221 and the sampling control switch 222 in phase or inversely in complementary manner to control the on / off state of the power output path and the sampling path. The power output path is the path from the AC bus to the AC output terminal of the inverter, and the sampling path is the path from the load detection unit 21 via the sampling control switch 222 and the AC bus to the AC output terminal. The control signal is sent by the target control module. The load detection unit 21 has a detection port and is connected to the AC output terminal through the switching unit 22. When the sampling path is on and an external load is connected to the AC output terminal, the load detection unit 21 outputs a load detection signal indicating the load connection to the target control module through the detection port, so that the target control module can determine the load detection result.

[0069] Furthermore, the load detection module 20 can be independently powered by the auxiliary winding provided by the drive power supply. Since the auxiliary winding is electrically isolated from the main power circuit, the power supply of the load detection module 20 is not affected by the operating state of the main power circuit. It can maintain normal power supply capability even when both the converter module and the inverter module are in the power output off state, thereby ensuring the continuity and reliability of load detection.

[0070] In some embodiments, after the target control module determines the load detection result, it can first control the power output state of the converter module and the inverter module, and then control the switching unit in the load detection module to turn on or off; alternatively, it can first control the switching unit in the load detection module to turn on or off, and then control the converter module and the inverter module to switch to the corresponding power output state. The specific execution order can be set according to actual application requirements, and this embodiment does not impose any restrictions on it.

[0071] As an optional implementation, the load detection unit 21 can output a load detection signal based on the AC sampled value. When the AC sampled value is greater than a preset threshold, the load detection unit 21 outputs a first signal, indicating that an external load is connected; when the AC sampled value is less than or equal to the preset threshold, the load detection unit 21 does not output a first signal, indicating that no external load is connected. By setting a preset threshold, false judgments caused by minor leakage current or interference can be avoided, thus improving the accuracy of detection.

[0072] As an alternative implementation, the load detection signal can be a level signal, and the target control module can determine whether a load is connected by detecting the received level signal. For example, when an external load is connected, the load detection unit 21 outputs a low-level signal; when no external load is connected, the load detection unit 21 outputs a high-level signal. In this mode, regardless of whether the load is connected or removed, the load detection unit 21 outputs a corresponding level signal, and the target control module can continuously obtain the current load status.

[0073] It is understood that the load detection unit 21 can be implemented by any circuit structure capable of sensing the load connection status, and this embodiment does not impose any restrictions on this.

[0074] As a preferred example, when the target response mode is fast response mode, since the converter module is already in the power output on state, the target control module can first control the sampling control switch 222 to turn on to confirm the load connection, and then control the main output switch 221 to turn on and start the inverter module to output externally. When the target response mode is low no-load response mode, the target control module can first control the sampling control switch 222 to turn on to confirm the load connection, and then sequentially control the converter module to establish the DC bus voltage, control the main output switch 221 to turn on, and control the inverter module to start output. Through the cooperation of the above control logic and circuit structure, both extremely low no-load standby power consumption and stable, shock-free output when the load is connected are achieved.

[0075] The specific circuit structure of the load detection module 20 is described in detail below.

[0076] like Figure 4 As shown in this embodiment, the main output switch 221 is connected between the AC bus and the AC output terminal, and the sampling control switch 222 is connected between the load detection unit 21 and the AC bus. The main output switch 221 and the sampling control switch 222 can be relays or MOSFETs; this embodiment does not impose any limitations on this.

[0077] like Figure 5 As shown, in some embodiments, the sampling control switch 222 includes a first sampling control switch S1 and a second sampling control switch S2. The first sampling control switch S1 is connected between the load detection unit 21 and the first AC bus. The second sampling control switch S2 is connected between the load detection unit 21 and the second AC bus.

[0078] The first AC bus and the second AC bus correspond to the lines where the AC live wire (ACL) and AC neutral wire (ACN) are located, respectively. The AC output terminals include a first output terminal A and a second output terminal B, which are used to connect to an external load (LOAD). The first output terminal A is located on the first AC bus, and the second output terminal B is located on the second AC bus.

[0079] When performing load detection, the first sampling control switch S1 and the second sampling control switch S2 are turned on in conjunction to connect the sampling path and ensure that the detection port can output the load detection signal normally according to the load detection result.

[0080] In this embodiment, the main output switch 221 is located on the output side of the AC bus, and the main output switch 221 and the sampling control switch 222 are turned on or off in phase. Specifically, the main output switch 221 includes a first sub-switch S31 and a second sub-switch S32 that are linked for on / off. The first sub-switch S31 is connected between the first output terminal A and the first sampling control switch S1, and the second sub-switch S32 is connected between the second output terminal B and the second sampling control switch S2. The main output switch 221 can be implemented using a single double-pole switch or two single-pole switches; this embodiment does not impose any restrictions on this. In this configuration, the main output switch 221 is turned on or off in phase with the first sampling control switch S1 and the second sampling control switch S2. When load detection is performed, the switching unit 22 responds to the control signal, causing the main output switch 221, the first sampling control switch S1, and the second sampling control switch S2 to turn on simultaneously. At this time, the sampling path is open, and the power output path is also open. With this configuration, real-time monitoring of the load connection status can be achieved during the inverter's external power supply process.

[0081] like Figure 6 As shown, in some other embodiments, the main output switch 221 can be set on the input side of the AC bus in the load detection module 20, and the main output switch 221 and the sampling control switch 222 are mutually complementary in that they can be turned on or off.

[0082] Specifically, the input side of the AC bus includes a first input terminal C and a second input terminal D, which are used to connect to the front-end circuit of the inverter. The first output terminal A is connected to the first sampling control switch S1, and the second output terminal B is connected to the second sampling control switch S2. A first sub-switch S31 is connected between the first sampling control switch S1 and the first input terminal C, and a second sub-switch S32 is connected between the second sampling control switch S2 and the second input terminal D. In this configuration, the main output switch 221 is mutually complementary to the first sampling control switch S1 and the second sampling control switch S2, either turning on or off. That is, during load detection, the main output switch 221 is off, and the first sampling control switch S1 and the second sampling control switch S2 are on; when a load is detected connected to the inverter, the main output switch 221 is on, and the first sampling control switch S1 and the second sampling control switch S2 are off.

[0083] When there is no load, the switching unit 22 responds to the control signal, turning on the sampling path and disconnecting the power output path. At this time, the main output switch 221 is off, and the first sampling control switch S1 and the second sampling control switch S2 are on. The load detection unit 21 detects the load connection status through the sampling path. When a load connection is detected, the switching unit 22 switches, turning off the sampling path and connecting the power output path. At this time, the main output switch 221 is on, and the first sampling control switch S1 and the second sampling control switch S2 are off. The inverter supplies power to the load LOAD through the power output path via the first output terminal A and the second output terminal B. In this configuration, only load detection is performed without output when there is no load, and only output is performed without detection when there is a load. This not only effectively reduces the power consumption of the inverter but also eliminates the influence of the load detection unit 21 on the main power circuit when the inverter outputs power.

[0084] It should be noted that the main output switch 221 can be configured using only one of the two methods described above, or the switches from both methods can be configured simultaneously in the circuit. When the switches from both methods are configured simultaneously, one set of switches remains normally closed, while the other set is controlled to open and close as needed; that is, the actual control function is still performed by one set of switches. For example, the first sub-switch S31 and the second sub-switch S32 can be configured on the input side of the AC bus, while the other set of sub-switches can be configured on the output side of the AC bus. The sub-switches configured on the input side of the AC bus remain normally closed. In this case, the main output switch 221 configured on the output side of the AC bus is actually controlled in phase with the first sampling control switch S1 and the second sampling control switch S2. The reverse is also true. It can be understood that regardless of the specific switch configuration method used, the function of in-phase linkage switching or anti-complementary linkage switching of the switch units in this embodiment can be achieved.

[0085] The specific circuit implementation of the load detection unit 21 will be described in detail below.

[0086] In some embodiments, the load detection unit 21 includes a first resistor R1, the first end of which is connected to the detection port LOAD_CHECK, and the second end of which is connected to the AC output terminal through the switching unit 22.

[0087] Furthermore, the switching unit 22 also includes a first power supply terminal VCC1, which provides the operating voltage for the sampling path. During load detection, the sampling path is activated. When the first output terminal A and the second output terminal B are connected to an external load LOAD, the operating voltage of the first power supply terminal VCC1 forms a detection path through the switching unit 22, the load LOAD, and the load detection unit 21. Then, a corresponding load detection signal is output to the target control module through the detection port LOAD_CHECK. The target control module obtains this load detection signal through the detection port LOAD_CHECK and determines whether the load LOAD is connected based on the load detection signal, thereby controlling the power output state of the inverter. Figure 5 and Figure 6 As shown, a single resistor can achieve basic load connection detection, which is low in cost.

[0088] Furthermore, the load detection unit 21 can also be implemented in other ways. In the following embodiments, the specific implementation of the load detection unit 21 is illustrated by taking the configuration of the main output switch 221 being set on the output side of the AC bus in the load detection module, and the main output switch 221 and the sampling control switch 222 being turned on or off in the same phase as the configuration.

[0089] It is understandable that when the main output switch 221 is set on the input side of the AC bus, and the main output switch 221 and the sampling control switch 222 are mutually complementary in being turned on or off, the load detection unit 21 has the same function, which will not be described in detail here.

[0090] In some embodiments, such as Figure 7 As shown, the load detection unit 21 also includes a first capacitor C1 and a first diode D1. The first end of the first capacitor C1 is connected to the first resistor R1, and the second end of the first capacitor C1 is grounded. The first end of the first diode D1 is connected to the power supply end, and the second end of the first diode D1 is connected to the detection port.

[0091] Specifically, the first capacitor C1 and the first resistor R1 form an RC filter circuit to filter out noise signals in the sampling path, making the load detection signal output to the detection port LOAD_CHECK more stable and avoiding false detections caused by interference. The cathode of the first diode D1 is connected to the second power supply terminal MCU_VCC, and the anode is connected to the detection port LOAD_CHECK. When an abnormally high voltage occurs in the sampling path, the first diode D1 conducts, clamping the voltage at the detection port near MCU_VCC, preventing excessive voltage from damaging the I / O port of the target control module connected to the detection port, thus protecting the target control module.

[0092] This embodiment is in Figure 5Based on the corresponding circuit, by adding a first capacitor C1 and a first diode D1 to the load detection unit 21, not only can the basic load detection function be realized, but the stability of the signal and the safety of the circuit are also improved.

[0093] Furthermore, in some embodiments, such as Figure 8 As shown, the load detection unit 21 also includes a second resistor R2, the first end of the second resistor R2 is connected to the first end of the first resistor R1, and the second end of the second resistor R2 is grounded.

[0094] Specifically, the second resistor R2 and the first resistor R1 form a voltage divider circuit, which is used to proportionally reduce or adjust the operating voltage in the sampling path before outputting it to the detection port LOAD_CHECK. This adapts to target control modules with different withstand voltage values, preventing the target control module from malfunctioning due to excessively high or low voltage. When the sampling path is on and an external load LOAD is connected between the first output terminal A and the second output terminal B, the operating voltage of the first power supply terminal VCC1 is proportionally distributed by the voltage divider circuit composed of the first resistor R1 and the second resistor R2 before being output to the detection port LOAD_CHECK. By adjusting the resistance ratio of the first resistor R1 and the second resistor R2, the voltage signal received by the detection port LOAD_CHECK can be adapted to target control modules with different operating voltage levels. For example, when the operating voltage of the target control module is 3.3V, the high level of the load detection signal can be adjusted to ensure that it does not exceed 3.3V, preventing the target control module from failing to recognize or being damaged due to excessively high signal voltage.

[0095] This embodiment improves the compatibility of the load detection circuit with different types of target control modules by adding a second resistor R2.

[0096] In some embodiments, such as Figure 9 As shown, the load detection unit 21 includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a second capacitor C2, a third capacitor C3, a second diode D2, and a first transistor Q1. The control terminal of the first transistor Q1 is connected to the AC bus via the third resistor R3 and the switching unit 22. The sixth resistor R6, the third capacitor C3, and the second diode D2 are connected in parallel, with one end connected to the control terminal of the first transistor Q1 and the other end grounded to GND2. The first terminal of the first transistor Q1 is connected to the detection port LOAD_CHECK via the fifth resistor R5, and the first terminal of the first transistor Q1 is also connected to the second power supply terminal MCU_VCC via the fourth resistor R4. The second terminal of the first transistor Q1 is grounded to GND2. One end of the second capacitor C2 is connected to the control terminal of the first transistor Q1, and the other end of the second capacitor C2 is grounded to GND2.

[0097] In one specific embodiment, the first transistor Q1 can be a MOS transistor, with its control terminal being the gate, its first terminal being the drain, and its second terminal being the source; or, the first transistor Q1 can also be a bipolar transistor, with its control terminal being the base, its first terminal being the collector, and its second terminal being the emitter.

[0098] In this embodiment, the switching on or off of the first transistor Q1 generates a load detection signal at the detection port LOAD_CHECK, indicating high or low levels. This allows the target control module to determine whether a load is connected to the inverter based on the load detection signal. When the sampling path is on, if an external load is connected to the AC output terminal, the first power supply terminal VCC1, through the switching unit 22, the third resistor R3, the sixth resistor R6, the third capacitor C3, and the second diode D2, provides a conduction voltage to the control terminal of the first transistor Q1. The first transistor Q1 is turned on, and the detection port LOAD_CHECK is grounded to GND2 through the fifth resistor R5 and the first transistor Q1. At this time, the voltage at the detection port LOAD_CHECK is at the GND2 level, i.e., a low level. If no load is connected to the AC output terminal, the control terminal of the first transistor Q1 is grounded to GND2 via the sixth resistor R6, the third capacitor C3, and the second diode D2, resulting in a turn-off voltage. The first transistor Q1 is turned off, and the detection port LOAD_CHECK is connected to the second power supply terminal MCU_VCC via the fourth resistor R4 and the fifth resistor R5. At this time, the voltage at the detection port LOAD_CHECK is the MCU_VCC voltage, i.e., a high level. Therefore, the target control module can determine whether a load is connected to the inverter based on the level signal corresponding to the load detection signal. Since the first transistor Q1 has a defined voltage threshold for conduction, it can only reach the conduction condition when the sampling path is open and an external load is connected. This avoids misjudgments of load detection caused by slight fluctuations in line voltage, improving the accuracy and reliability of the detection.

[0099] In some embodiments, such as Figure 10 As shown, the load detection unit 21 includes a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a fourth capacitor C4, and a first optocoupler U1. The input terminal of the first optocoupler U1 is connected to the AC bus via the seventh resistor R7 and the switching unit 22, and is also grounded to GND3. The output terminal of the first optocoupler U1 is connected to the detection port LOAD_CHECK via the ninth resistor R9, and is also connected to signal ground SGND. The output terminal of the first optocoupler U1 is also connected to the second power supply terminal MCU_VCC via the eighth resistor R8. One end of the fourth capacitor C4 is connected to the detection port LOAD_CHECK, and the other end is connected to signal ground SGND.

[0100] The first optocoupler U1 transmits electrical signals via optical signals, achieving electrical isolation between its input and output terminals. For example... Figure 10As shown, the first optocoupler U1 includes an input terminal and an output terminal. The input terminal is a light-emitting diode terminal, and the output terminal is a phototransistor terminal. Electrical signals are transmitted through optical signals, and the high and low voltage sides are completely electrically isolated. The first input terminal of the first optocoupler U1 is connected to the AC bus via the seventh resistor R7 and the switching unit 22, and the second input terminal is grounded to GND3. The second output terminal of the first optocoupler U1 is connected to signal ground SGND, and the first output terminal is connected to the detection port LOAD_CHECK via the ninth resistor R9. When the sampling path is active, if an external load is connected to the AC output terminal, the first power supply terminal VCC1 is connected in series with the input terminal of the first optocoupler U1 via the switching unit 22, the seventh resistor R7, and the switching unit 22. The LED emits light, triggering the phototransistor at the output terminal to conduct. The detection port LOAD_CHECK is connected to signal ground SGND via the ninth resistor R9 and the conducting phototransistor, and the detection port LOAD_CHECK outputs a low level. If no external load is connected to the AC output terminal, there is no voltage at the input terminal of the first optocoupler U1, the LED does not emit light, the phototransistor at the output terminal is disconnected, and the detection port LOAD_CHECK is pulled up to the second power supply terminal MCU_VCC via the ninth resistor R9 and the eighth resistor R8. The voltage at the detection port LOAD_CHECK is then the same as the MCU_VCC voltage, i.e., a high level. Therefore, the target control module can determine whether the inverter is connected to a load based on the level signal corresponding to the load detection signal. Since the first optocoupler U1 transmits electrical signals through optical signals, electrical isolation is achieved between the input and output terminals, which completely isolates the high-voltage side where the AC output terminal is located from the low-voltage side where the detection port is located, thus preventing high voltage from entering the low-voltage side and damaging the target control module, thereby improving the safety of the circuit.

[0101] Furthermore, in some embodiments, such as Figure 11 As shown, the inverter load detection module 20 also includes a current detection unit 23. The input terminal of the current detection unit 23 is electrically connected to the AC bus to collect the AC bus current. The output terminal of the current detection unit 23 is connected to the inverter's target control module and outputs a current detection signal to the target control module. The current detection unit 23 can use a resistance sampling detection method, in which case the current detection unit 23 is connected in series with the AC bus; it can also use a current transformer detection method, in which case the current detection unit 23 is connected to the AC bus through a current transformer; or it can use a Hall current detection method, in which case the current detection unit 23 senses the current in the AC bus through a Hall current sensor. This embodiment does not limit the specific implementation of the current detection unit 23. The target control module can simultaneously acquire the load detection signal and the current detection signal from the detection port LOAD_CHECK, determine whether the load is connected by combining the two signals, and further determine the load condition based on the current detection signal to adjust the inverter's power output.

[0102] Please refer to Figure 12This application provides an inverter 300, which includes at least a main control module 31, a converter module 32, an inverter module 33, a power control module 34, and a load detection module 20. The power control module 34 includes a converter control module 341 and an inverter control module 342. This inverter 300 can be used to execute all the steps in the aforementioned inverter output control method.

[0103] Specifically, the main control module 31 is used to determine the target response mode and target control module of the inverter 300; wherein, the target control module is either the converter control module 341 or the inverter control module 342; when the target response mode is a fast response mode, the converter control module 341 is used to control the converter module 32 to be in the power output on state, and the target control module is used to determine the load detection result through the load detection module 20, and to control the power output state of the inverter module 33 according to the load detection result, so as to control the output of the inverter 300; when the target response mode is a low no-load response mode, the target control module is used to control the power output state of the converter module 32 and the inverter module 33 according to the load detection result, so as to control the output of the inverter 300; wherein, the power output state includes the power output on state and the power output off state.

[0104] For ease of understanding, please refer to the example provided. Figure 13 This application provides a circuit diagram of an inverter 300, which is a boost inverter, and the target control module is a converter control module 341. Specifically: The converter module 32 includes a low-voltage side DC-DC H-bridge, a high-voltage side DC-DC H-bridge, and a high-frequency transformer T1. The inverter module 33 includes an inverter H-bridge (INV H-bridge). The power control module 34 also includes an isolated communication interface 343, which includes a first isolated communication interface RX1 and a second isolated communication interface TX1, connected between the converter control module 341 and the inverter control module 342, for bidirectional signal transmission between the high-voltage and low-voltage side control modules.

[0105] The inverter 300 also includes an auxiliary power supply circuit 35 and a drive circuit 36. The auxiliary power supply circuit 35 includes a first auxiliary power supply DC-DC1, a second auxiliary power supply DC-DC2, and a third auxiliary power supply DC-DC3. The first auxiliary power supply DC-DC1 is powered by the battery voltage VBAT and is used to output a first operating voltage. The second auxiliary power supply DC-DC2 is connected to the output terminal of the first auxiliary power supply DC-DC1 and is used to step down the first operating voltage to convert it into a second operating voltage. The third auxiliary power supply DC-DC3 is used to provide auxiliary power under specific conditions.

[0106] The driving circuit 36 ​​includes multiple driving chips, exemplarily including driving chips DA1, DB1, DC1, DD1, DE1, and DF1. Each driving chip is connected to a corresponding power switch and power control module 34 to amplify the PWM driving signal output by the power control module 34 to drive the power switch.

[0107] The drive power supply 37 includes a first drive power supply Z1 or a second drive power supply Z2, used to provide multiple isolated drive voltages. For example, the drive power supply 37 can provide five isolated drive voltages V1-V5, each powering a different drive chip. The first drive power supply Z1 and the second drive power supply Z2 can be selected for use depending on the readiness state of the converter module 32.

[0108] The inverter 300 also includes a third isolated communication interface RX2 and a fourth isolated communication interface TX2 for communication between the microcontrollers inside the main control module 31.

[0109] The main control module 31 sends an enable signal to the first auxiliary power supply DC-DC1 based on the received power-on command. The power-on command can be a user button command, a Battery Management System (BMS) command, or a host computer command.

[0110] The first auxiliary power supply DC-DC1 is powered on and starts up according to the enable signal, outputting a first operating voltage. For example, the first operating voltage is +12V. The first operating voltage supplies power to the driver chip DA1, driver chip DE1, first driving power supply Z1, and second auxiliary power supply DC-DC2 in the driver circuit 36.

[0111] The second auxiliary power supply DC-DC2 steps down the first operating voltage to a second operating voltage, exemplarily +3.3V. This second operating voltage powers the converter control module 341 and the low-voltage side control circuit.

[0112] The first drive power supply Z1 provides isolated power to the drive chips DB1, DC1, and DD1 in the drive circuit 36. If the DC-DC H-bridges on both sides of the converter module 32 are ready (i.e., the boost is complete), the second drive power supply Z2 can be used to replace the first drive power supply Z1, and the third auxiliary power supply DC-DC3 and the drive chip DF1 in the drive circuit 36 ​​provide multiple isolated drive voltages for the second drive power supply Z2.

[0113] After the auxiliary power supply circuit 35 is powered on, the converter control module 341 and the inverter control module 342 are powered and start up normally.

[0114] The main control module 31 performs initialization checks on each functional module of the inverter 300 through the converter control module 341 and the inverter control module 342. The initialization checks may include, but are not limited to, the following: The detection of whether the output voltage of the auxiliary power supply circuit 35 is normal includes detecting whether the first working voltage output by the first auxiliary power supply DC-DC1, the second working voltage output by the second auxiliary power supply DC-DC2, and the output voltage of the third auxiliary power supply DC-DC3 are within their respective preset normal ranges; the detection of the status of each driver chip in the driver circuit 36 ​​includes detecting whether driver chips DA1, DB1, DC1, DD1, DE1, and DF1 are in a normal working state; the detection of whether each isolated drive voltage in the driver power supply 37 is ready includes detecting whether the multiple isolated drive voltages V1-V5 provided by the first drive power supply Z1 or the second drive power supply Z2 are ready. The system achieves the preset voltage value; detects the status of the power bridge circuit, which includes the low-voltage side DC-DC H-bridge and the high-voltage side DC-DC H-bridge in the converter module 32, the inverter H-bridge in the inverter module 33, and the DC bus voltage VBUS; detects the status of the load detection module 20, including whether the power supply to the load detection module 20 is normal and whether the detection path is connected; and detects the status of the communication interface, which includes the first isolated communication interface RX1 and the second isolated communication interface TX1 between the converter control module 341 and the inverter control module 342, as well as the third isolated communication interface RX2 and the fourth isolated communication interface TX2 used for internal communication of the main control module 31.

[0115] Based on the results of the initialization tests described above, the main control module 31 confirms whether each functional module of the inverter 300 is in a ready state. If any module is not ready, the main control module 31 can output a corresponding fault indication signal.

[0116] After initialization detection is completed and the system is confirmed to be ready, the main control module 31 obtains the preset target response mode of the inverter 300, as well as the target control module in the converter control module 341 and the inverter control module 342 used to obtain the load detection results.

[0117] The target response mode includes a fast response mode and a low idle load response mode. The choice of response mode and which control module acquires the load detection results can be set before the product leaves the factory according to actual needs. For example, a fast response mode can be used in conjunction with the inverter control module 342 acquiring the load detection results; this configuration has lower hardware costs and faster response speed. Alternatively, both the converter control module 341 and the inverter control module 342 can be specified to acquire the load detection results simultaneously. This configuration provides the most accurate load detection results, but the hardware cost is relatively higher. The specific configuration method can be flexibly selected based on the product's target application scenario and cost requirements.

[0118] The main control module 31 will synchronize the acquired target response mode and target control module to the converter control module 341 and the inverter control module 342.

[0119] After completing the power-on initialization and mode configuration described above, the inverter 300 enters the ready state and controls the inverter output according to the preset target response mode and target control module. The specific steps of the control method are as described in the previous method embodiments.

[0120] Please refer to Figure 14 This application also provides an energy storage power supply 400, including a battery 401 and an inverter 300 as described in any of the foregoing embodiments. The inverter 300 is connected to the battery 401 and is used to convert the direct current output from the battery 401 into alternating current output.

[0121] The energy storage power supply 400 of this embodiment includes the inverter 300 of any of the above embodiments and has all the beneficial effects of the inverter 300, which will not be repeated here.

[0122] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0123] The above provides a detailed description of an inverter output control method, inverter, and energy storage power supply provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. An inverter output control method, characterized in that, The inverter includes a main control module, a power control module, a converter module, and an inverter module; the method includes: The main control module determines the target response mode and target control module of the inverter; wherein, the target control module is a control module determined from the power control module; When the target response mode is fast response mode, the converter module is in the power output on state, and the target control module controls the power output state of the inverter module according to the load detection result, so as to control the output of the inverter. When the target response mode is the low no-load response mode, the target control module controls the power output state of the converter module and the inverter module according to the load detection result, so as to control the output of the inverter; wherein, the power output state includes the power output on state and the power output off state.

2. The method according to claim 1, characterized in that, The power control module includes a converter control module and an inverter control module; When the target response mode is fast response mode, the converter module is in the power output on state, and the target control module controls the power output state of the inverter module according to the load detection result, so as to control the output of the inverter, including: When the target response mode is fast response mode, the converter control module controls the converter module to be in the power output on state; If the target control module is a converter control module, the converter control module determines the load detection result; The converter control module sends a communication signal to the inverter control module based on the load detection result to control the power output state of the inverter module, thereby controlling the output of the inverter. If the target control module is an inverter control module, the inverter control module determines the load detection result; The inverter control module controls the power output state of the inverter module based on the load detection result, thereby controlling the output of the inverter.

3. The method according to claim 2, characterized in that, The converter control module sends a communication signal to the inverter control module based on the load detection result to control the power output state of the inverter module, thereby controlling the output of the inverter, including: If the converter control module detects an access load, the converter control module sends a first communication signal to the inverter control module; The inverter control module controls the inverter module to be in the power output on state according to the received first communication signal, and turns on the inverter to output to the outside. If the converter control module detects that no load is connected, the converter control module sends a second communication signal to the inverter control module; The inverter control module controls the inverter module to be in a power output off state according to the received second communication signal, thereby shutting off the external output of the inverter.

4. The method according to claim 2, characterized in that, The inverter control module controls the power output state of the inverter module based on the load detection result, thereby controlling the output of the inverter, including: If the inverter control module detects an access load, the inverter control module controls the inverter module to be in the power output on state, and turns on the inverter to output to the outside. If the inverter control module detects that no load is connected, the inverter control module controls the inverter module to be in a power output off state, thus shutting down the inverter's external output.

5. The method according to claim 1, characterized in that, The power control module includes a converter control module and an inverter control module; When the target response mode is a low-load response mode, the target control module controls the power output state of the converter module and the inverter module according to the load detection result, so as to control the output of the inverter, including: When the target response mode is a low no-load response mode and the target control module is a converter control module, the converter control module determines the load detection result; The converter control module controls the power output state of the converter module and the inverter module according to the load detection result, so as to control the output of the inverter; When the target response mode is a low no-load response mode and the target control module is an inverter control module, the inverter control module determines the load detection result; The inverter control module controls the power output state of the converter module and the inverter module according to the load detection result, so as to control the output of the inverter.

6. The method according to claim 5, characterized in that, The converter control module controls the power output state of the converter module and the inverter module based on the load detection result, thereby controlling the output of the inverter, including: If the converter control module detects an access load, the converter control module controls the converter module to be in the power output on state and sends a first communication signal to the inverter control module; The inverter control module controls the inverter module to be in the power output on state according to the received first communication signal, and turns on the inverter to output to the outside. If the converter control module detects that no load is connected, the converter control module sends a second communication signal to the inverter control module; The inverter control module controls the inverter module to be in the power output off state according to the received second communication signal, thereby turning off the inverter's external output; The converter control module controls the converter module to be in the power output off state.

7. The method according to claim 5, characterized in that, The inverter control module controls the power output state of the converter module and the inverter module based on the load detection result, thereby controlling the output of the inverter, including: If the inverter control module detects an access load, the inverter control module sends a first communication signal to the converter control module; The converter control module controls the converter module to be in the power output on state according to the received first communication signal; The inverter control module controls the inverter module to be in the power output on state, thus enabling the inverter to output power to the outside. If the inverter control module detects that no load is connected, the inverter control module controls the inverter module to be in a power output off state, thus shutting down the inverter's external output; The inverter control module sends a second communication signal to the converter control module; The converter control module controls the converter module to be in the power output off state according to the received second communication signal.

8. The method according to any one of claims 1 to 7, characterized in that, The inverter also includes a load detection module, which includes a load detection unit and a switching unit. The switching unit includes a main output switch and a sampling control switch. The switching unit has a control terminal for receiving control signals. In response to the received control signals, the switching unit switches the main output switch and the sampling control switch in phase or inversely in complementary manner to control the on / off state of the power output path and the sampling path. The power output path is the path from the AC bus to the AC output terminal of the inverter, and the sampling path is the path from the load detection unit through the sampling control switch and the AC bus to the AC output terminal. The control signals are sent by the target control module. The load detection unit has a detection port and is connected to the AC output terminal through the switch unit. When the sampling path is turned on and an external load is connected to the AC output terminal, the load detection unit is used to output a load detection signal representing the load connection to the target control module through the detection port, so that the target control module can determine the load detection result.

9. The method according to claim 8, characterized in that, The main output switch is connected between the AC bus and the AC output terminal, and the sampling control switch is connected between the load detection unit and the AC bus.

10. The method according to claim 9, characterized in that, The sampling control switch includes a first sampling control switch and a second sampling control switch; the first sampling control switch is connected between the load detection unit and the first AC bus, and the second sampling control switch is connected between the load detection unit and the second AC bus.

11. The method according to claim 10, characterized in that, The main output switch is located on the input side of the AC bus in the load detection module, and the main output switch and the sampling control switch are mutually complementary in that they can be turned on or off.

12. The method according to claim 10, characterized in that, The main output switch is located on the output side of the AC bus, and the main output switch and the sampling control switch are in phase and can be turned on or off.

13. An inverter, characterized in that, The inverter is used to perform the inverter output control method as described in any one of claims 1 to 12.

14. An energy storage power source, characterized in that, It includes a battery and an inverter as described in claim 13, the inverter being connected to the battery.

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