Control method of power conversion system, controller, storage medium and program product

Abstract

The invention relates to a control method of a power conversion system, a controller, a storage medium and a program product. The power conversion system comprises a plurality of first-stage channels and a shared second-stage channel, the input end of each first-stage channel is connected with a direct current source, at least two first-stage channels are connected with different direct current sources, and the output ends of the first-stage channels are connected in parallel and connected with the second-stage channel; the control method comprises the following steps: acquiring operation data of a plurality of primary channels; in response to a trigger signal, determining control information of each first-level channel according to the operation data of the plurality of first-level channels; and controlling at least two primary channels to operate in a hiccup mode according to the control information of each primary channel, and enabling the secondary channels to continuously output target alternating current. According to the invention, the alternating current can be continuously output, and the power conversion rate of the power conversion system is improved.

Description

Technical Field

[0001] This application relates to the field of power conversion technology, and in particular to a control method, controller, storage medium and program product for a power conversion system. Background Technology

[0002] In related technologies, power converters can be composed of single-channel converters, which employ a hiccup mode to improve conversion efficiency during low-power operation. However, when a single-channel converter is hiccup-operated, it cannot continuously output AC power. Summary of the Invention

[0003] Therefore, it is necessary to provide a control method, controller, storage medium, and program product for a power conversion system capable of continuously outputting alternating current, addressing the aforementioned technical problems.

[0004] In a first aspect, this application provides a control method for a power conversion system, the power conversion system comprising: multiple primary channels and a shared secondary channel, wherein the input terminal of each primary channel is connected to a DC source, and at least two primary channels are connected to different DC sources, and the output terminals of the multiple primary channels are connected in parallel and connected to the secondary channel; the control method includes:

[0005] Obtain operational data from multiple primary channels;

[0006] In response to the trigger signal, the control information of each primary channel is determined based on the operating data of multiple primary channels;

[0007] Based on the control information of each primary channel, control at least two primary channels to operate in hiccup mode, and enable the secondary channel to continuously output the target AC current.

[0008] Secondly, this application also provides a controller, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0009] Obtain operational data from multiple primary channels;

[0010] In response to the trigger signal, the control information of each primary channel is determined based on the operating data of multiple primary channels;

[0011] Based on the control information of each primary channel, control at least two primary channels to operate in hiccup mode, and enable the secondary channel to continuously output the target AC current.

[0012] Thirdly, this application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, performs the following steps:

[0013] Obtain operational data from multiple primary channels;

[0014] In response to the trigger signal, the control information of each primary channel is determined based on the operating data of multiple primary channels;

[0015] Based on the control information of each primary channel, control at least two primary channels to operate in hiccup mode, and enable the secondary channel to continuously output the target AC current.

[0016] Fourthly, this application also provides a computer program product, including a computer program that, when executed by a processor, performs the following steps:

[0017] Obtain operational data from multiple primary channels;

[0018] In response to the trigger signal, the control information of each primary channel is determined based on the operating data of multiple primary channels;

[0019] Based on the control information of each primary channel, control at least two primary channels to operate in hiccup mode, and enable the secondary channel to continuously output the target AC current.

[0020] The aforementioned power conversion system control method, controller, storage medium, and program product include a power conversion system comprising multiple primary channels and a shared secondary channel. Each primary channel's input terminal is connected to a DC source, and at least two primary channels are connected to different DC sources. The output terminals of the multiple primary channels are connected in parallel and connected to the secondary channel. The control method includes: acquiring operating data of the multiple primary channels; determining control information for each primary channel based on the operating data in response to a trigger signal; and controlling at least two primary channels to operate in a hiccup mode based on the control information of each primary channel, while ensuring the secondary channel continuously outputs a target AC current. This application embodiment, based on the operating data of the primary channels, can control one or more primary channels to operate in a hiccup mode, which not only reduces the power consumption of the power conversion system and improves its conversion efficiency, but also allows the power conversion system to continuously output AC current even in hiccup mode. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies 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.

[0022] Figure 1 This is one of the structural schematic diagrams of a power conversion system in one embodiment;

[0023] Figure 2This is one of the structural schematic diagrams of the prior art in one embodiment;

[0024] Figure 3 This is one of the structural schematic diagrams of the primary channel in one embodiment;

[0025] Figure 4 This is the second schematic diagram of the structure of the primary channel in one embodiment;

[0026] Figure 5a This is the third schematic diagram of the structure of the primary channel in one embodiment;

[0027] Figure 5b This is the fourth schematic diagram of the structure of the primary channel in one embodiment;

[0028] Figure 5c This is the fifth schematic diagram of the structure of the primary channel in one embodiment;

[0029] Figure 5d This is the sixth schematic diagram of the structure of the primary channel in one embodiment;

[0030] Figure 5e This is the seventh schematic diagram of the structure of the primary channel in one embodiment;

[0031] Figure 5f This is the eighth schematic diagram of the structure of the primary channel in one embodiment;

[0032] Figure 5g This is the ninth schematic diagram of the structure of the primary channel in one embodiment;

[0033] Figure 5h This is the ninth schematic diagram of the structure of the primary channel in one embodiment;

[0034] Figure 6 This is a second schematic diagram of the power conversion system in one embodiment;

[0035] Figure 7 This is a flowchart illustrating the control method of a power conversion system in one embodiment;

[0036] Figure 8 This is a flowchart illustrating the steps for determining control information for each primary channel in one embodiment.

[0037] Figure 9 This is a flowchart illustrating the steps for determining control information for each primary channel in another embodiment;

[0038] Figure 10a This is a schematic diagram of one embodiment of the current waveform;

[0039] Figure 10b This is a second schematic diagram of the current waveform in one embodiment;

[0040] Figure 10c This is the third schematic diagram of the current waveform in one embodiment;

[0041] Figure 10d This is a fourth schematic diagram of the current waveform in one embodiment;

[0042] Figure 10e This is the fifth schematic diagram of the current waveform in one embodiment;

[0043] Figure 10f This is a schematic diagram of the current waveform in one embodiment;

[0044] Figure 10g This is the seventh schematic diagram of the current waveform in one embodiment;

[0045] Figure 10h This is the eighth schematic diagram of the current waveform in one embodiment;

[0046] Figure 10i This is the ninth schematic diagram of a current waveform in one embodiment;

[0047] Figure 10j This is the tenth schematic diagram of the current waveform in one embodiment;

[0048] Figure 11 This is a diagram of the internal structure of the controller in one embodiment. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0050] It is understood that the terms "first," "second," etc., used in this application may be used to describe various elements herein, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor. It is understood that the term "connection" used in this application refers to one circuit / module / unit being directly or indirectly connected to another circuit / module / unit (or communicating directly or indirectly with another circuit / module / unit). If the connected circuits, modules, units, etc., transmit electrical signals or data to each other, it should be understood as "electrical connection," "communication connection," etc. It is understood that the term "based on" used in this application is used to describe one or more factors affecting the determination, and does not exclude other factors that may affect the determination. For example, the phrase "determine A based on B" means that the determination of A can be based entirely or at least partially on factor B, that is, B is a factor affecting the determination of A, but does not exclude the determination of A being based on C.

[0051] First, before introducing the technical solutions of the embodiments of this application in detail, we will first introduce the technical background or technical evolution on which the embodiments of this application are based. With the development of new energy technologies, the application of power converters is becoming more and more widespread. A power converter is a power conversion device used to convert electrical energy from one form to another to realize energy transmission and control under different power requirements. Power converters can be microinverters, energy storage converters, etc. For example, a microinverter can convert DC direct current to AC alternating current. The DC input of the microinverter is connected to a DC source (photovoltaic module), and the AC output can be connected to the AC power grid and AC equipment.

[0052] In related technologies, power converters can be composed of single-channel converters, which employ a hiccup mode to improve conversion efficiency during low-power operation. However, when a single-channel converter is hiccup-operated, it cannot continuously output AC power.

[0053] To address the aforementioned problems, this application provides a control method for a power conversion system. The power conversion system includes multiple primary channels and a shared secondary channel. Each primary channel's input is connected to a DC source, and at least two primary channels are connected to different DC sources. For example, the power conversion system may include three primary channels, with two connected to a first DC source and the other connected to a second DC source; or, the three primary channels may be connected to a first, second, and third DC source, respectively. Furthermore, the outputs of the multiple primary channels are connected in parallel and to the secondary channel. The method includes acquiring operating data of the multiple primary channels; determining control information for each primary channel based on the operating data in response to a trigger signal; and controlling at least two primary channels to operate in a hiccup mode based on the control information, while ensuring the secondary channel continuously outputs a target AC current. The technical solution provided by this application allows the power conversion system to operate in a corresponding hiccup mode based on the operating data of the primary channels. This not only reduces power loss and improves conversion efficiency but also allows for continuous output of AC current through superposition and rectification by the secondary channel of the currents output from multiple primary channels. Furthermore, at least two primary channels are connected to different DC sources. Depending on the output power of the different DC sources, different control methods can be used to control the power conversion system, enabling the power conversion system to have multiple power conversion modes, such as a hiccup mode, which is suitable for more application scenarios.

[0054] The following section provides a detailed introduction to power conversion systems and their control methods.

[0055] In one exemplary embodiment, such as Figure 1 As shown, the power conversion system includes multiple primary channels 11 and a shared secondary channel 12. The input terminal of each primary channel 11 is connected to a DC source, and at least two primary channels 11 are connected to different DC sources. The output terminals of the multiple primary channels 11 are connected in parallel and connected to the secondary channel 12.

[0056] For example, the power conversion system includes two primary channels 11 and a shared secondary channel. The two primary channels 11 are respectively connected to DC source DC1 and DC source DC2; the output terminals of the two primary channels 11 are connected in parallel and connected to the secondary channel 12.

[0057] In this embodiment, the power conversion system includes a controller, multiple primary channels 11, and one secondary channel 12. The controller is connected to each primary channel 11 and each secondary channel 12 (the controller and its connection relationships are not detailed in the provided text). Figure 1(As shown in the diagram). The input terminals of each primary channel 11 are connected to a DC power source. The output terminals of multiple primary channels 11 are connected in parallel and are all connected to secondary channels 12. Each primary channel 11 converts the DC current output from the DC power source into AC current. The secondary channel 12 rectifies the superimposed output current from multiple primary channels to obtain the target AC current. The secondary channel 12 outputs AC current, which can be supplied to the AC power grid or an AC load.

[0058] At least two of the multiple primary channels 11 are connected to different DC sources (DCs). These different DC sources have different output capabilities (maximum output power). Therefore, the active power setpoints of the primary channels 11 connected to different DC sources need to be different. For example, the output power of DC source DC1 is greater than the output power of DC source DC2, meaning the output capability of DC source DC1 is higher than that of DC source DC2. Therefore, the active power setpoint of the primary channel connected to DC source DC1 can be higher than that connected to DC source DC2.

[0059] In some embodiments, the DC source may be a solar panel, a battery, or a combination of a solar panel and a battery.

[0060] In the above embodiments, at least two primary channels are connected to different DC sources. Depending on the output power of the different DC sources, different control methods can be used to control the power conversion system, enabling the power conversion system to have multiple power conversion modes and be applicable to more application scenarios.

[0061] Existing technologies primarily target single-input systems, where the input source is a single DC source. The system contains n primary channels, all connected to the same DC source, and each channel carries a power of 1 / n. Figure 2 As shown, when the system includes two primary channels, each primary channel carries half the power of the DC source. The blocking and generating phases of each primary channel operate alternately, thus easily achieving symmetrical hiccup mode control, which can be accomplished by performing simple interleaving operation on each primary channel.

[0062] This invention addresses systems with multiple independent voltage source inputs, where different modules are not simply connected in parallel. The operation of each primary channel is limited by its corresponding input power, significantly increasing the difficulty of control. Existing technologies employ fixed, symmetrical hiccup patterns primarily suitable for single-input, single-output scenarios; however, this invention dynamically adjusts the hiccup pattern control strategy based on the operating data of each primary channel, optimizing the overall system performance and efficiency.

[0063] In an exemplary embodiment of the present invention, there is no energy buffer capacitor at the connection point of each primary channel 11 and secondary channel 12.

[0064] In existing technologies, a large energy buffer is needed to reduce output fluctuations caused by hiccups; therefore, an energy buffer capacitor is typically used. For example... Figure 2 As shown, in existing technologies, multiple primary channels are connected to the same DC source, and energy buffer capacitors are set between the multiple primary channels and the secondary channels. However, the selection and size of the energy buffer capacitors increase the design complexity of the circuit, and the energy buffer capacitors also increase the cost and power loss of the inverter.

[0065] The power conversion system and control method provided in this application embodiment have relatively low output fluctuations even when one or more primary channels 11 operate in hiccup mode. Therefore, in this application embodiment, no energy buffer capacitor is provided at the connection between each primary channel 11 and the secondary channel 12.

[0066] In the above embodiments, there are no energy buffer capacitors at the connection points of each primary channel and secondary channel, which can achieve the effect of smoothing ripple. Furthermore, the absence of energy buffer capacitors can reduce the design difficulty of the circuit and reduce the cost and power loss of the power conversion system.

[0067] In an exemplary embodiment, the primary channel 11 includes a primary-side bridge arm circuit 111, a high-frequency transformer T, a resonant circuit 112, and a secondary-side bridge arm circuit 113.

[0068] In this embodiment, the primary channel 11 is used to convert the DC current input from the DC source into a half-sine wave. Based on this, the primary channel 11 may include a primary side bridge arm circuit 111, a high-frequency transformer T, a resonant circuit 112, and a secondary side bridge arm circuit 113.

[0069] The resonant circuit 112 can be set on the primary side of the high-frequency transformer T or on the secondary side of the high-frequency transformer. Figure 3 An embodiment is shown where the resonant circuit 112 is located on the secondary side of a high-frequency transformer. For example... Figure 3 As shown, the input terminal of the primary side bridge arm circuit 111 is connected to the DC source DC, and the output terminal is connected to the primary side of the high-frequency transformer T; the secondary side of the high-frequency transformer T is connected to the input terminal of the resonant circuit 112, and the output terminal of the resonant circuit 112 is connected to the input terminal of the secondary side bridge arm circuit 113; the output terminal of the secondary side bridge arm circuit 113 is connected to the input terminal of the secondary channel 12.

[0070] In practical operation, the primary side bridge arm circuit 111 can convert the DC voltage output by the DC source into an AC voltage and transmit it to the high-frequency transformer T. The AC voltage is then transformed and transmitted to the secondary side bridge arm circuit 113. The secondary side bridge arm circuit 113 shapes the transformed voltage and transmits the shaped voltage to the secondary channel 12.

[0071] It should be noted that when the primary channel 11 is running in hiccup mode, the controller can control the primary side bridge arm circuit 111 and / or the secondary side bridge arm circuit 113 to shut down during a preset period, thereby achieving the shutdown of the entire primary channel 11 during the preset period.

[0072] In some embodiments, the primary-side bridge arm circuit 111 may include an H-bridge circuit or a half-bridge circuit, and the secondary-side bridge arm circuit 113 may include an H-bridge circuit or a half-bridge circuit. For example, the primary-side bridge arm circuit 111 of the first-stage channel 11 is an H-bridge circuit, and the secondary-side bridge arm circuit 113 is a half-bridge circuit; or, the primary-side bridge arm circuit 111 of the first-stage channel 11 is a half-bridge circuit, and the secondary-side bridge arm circuit 113 is an H-bridge circuit.

[0073] It should be noted that in scenarios involving high-power conversion, the secondary bridge arm circuit 113 can be an H-bridge circuit.

[0074] In the above embodiments, the primary channel includes a primary-side bridge arm circuit, a high-frequency transformer, a resonant circuit, and a secondary-side bridge arm circuit. The primary channel structure provided in this application embodiment can realize current conversion and current shaping functions, providing a foundation for the secondary channel to output the target AC current.

[0075] In an exemplary embodiment of the present invention, both the primary channel and the secondary channel are capable of bidirectional power transmission.

[0076] In one exemplary embodiment, such as Figure 4As shown, the primary-side bridge arm circuit 111 includes an H-bridge circuit, comprising a first switch M1, a second switch M2, a third switch M3, and a fourth switch M4. The control terminal of the first switch M1 is connected to the controller of the power conversion system, and its first terminal is connected to the positive terminal of the DC source. The second terminal of the first switch M1 is connected to the first terminal of the second switch M2 and the first end of the primary side of the high-frequency transformer T. The control terminal of the second switch M2 is connected to the controller, and its second terminal is connected to the negative terminal of the DC source. The control terminal of the third switch M3 is connected to the controller, and its first terminal is connected to the positive terminal of the DC source. The second terminal of the third switch M3 is connected to the first terminal of the fourth switch M4 and the second end of the primary side of the high-frequency transformer T. The control terminal of the fourth switch M4 is connected to the controller, and its second terminal is connected to the negative terminal of the DC source. It should be noted that the controller and its connections to the switches are not shown in the figure.

[0077] In this embodiment, the first switch M1, the second switch M2, the third switch M3, and the fourth switch M4 can operate at high frequency. The controller can control the direction of the current in the primary winding of the input high-frequency transformer T by controlling the switching on and off of the first switch M1, the second switch M2, the third switch M3, and the fourth switch M4.

[0078] For example, if the first switch M1 and the fourth switch M4 are turned on, and the second switch M2 and the third switch M3 are turned off, the DC current output from the positive terminal of the DC source flows from the first switch M1 into the first terminal of the primary winding of the high-frequency transformer T, flows out from the second terminal of the primary winding of the high-frequency transformer T, and then flows through the fourth switch M4 back to the negative terminal of the DC source. If the first switch M1 and the fourth switch M4 are turned off, and the second switch M2 and the third switch M3 are turned on, the DC current output from the positive terminal of the DC source flows from the third switch M3 into the second terminal of the primary winding of the high-frequency transformer T, flows out from the first terminal of the primary winding of the high-frequency transformer T, and then flows through the second switch M2 back to the negative terminal of the DC source.

[0079] It should be noted that when the primary channel 11 is running in hiccup mode, if the primary side bridge arm circuit 111 is turned off during a preset period, the controller will control the first switch M1, the second switch M2, the third switch M3 and the fourth switch M4 to be turned off during the preset period.

[0080] In the above embodiments, the primary side bridge arm circuit consists of four switching transistors. By controlling the switching transistors to turn on and off, the direction of the current flowing into the high-frequency transformer can be controlled, and the primary channel can be turned off during a preset period of time. This allows the primary channel to operate in a hiccup mode, thereby reducing the power loss of the power conversion system and improving the power conversion efficiency of the power conversion system.

[0081] In one exemplary embodiment, such as Figure 5a As shown, the resonant circuit 112 includes a resonant inductor L and a resonant capacitor C1. The secondary bridge arm circuit 113 includes a fifth switch M5, a sixth switch M6, and a filter capacitor C2. The resonant inductor L can be an independent inductor or the leakage inductance of the secondary side of the high-frequency transformer T. The first end of the resonant inductor L is connected to the first end of the secondary side of the high-frequency transformer T, and the second end of the resonant inductor L is connected to the common terminal of the fifth switch M5 and the sixth switch M6. The first end of the resonant capacitor C1 is connected to the second end of the secondary side of the high-frequency transformer T, and the second end of the resonant capacitor C1 is connected to the second terminal of the sixth switch M6. The control terminal of the fifth switch M5 is connected to the controller, the first terminal of the fifth switch M5 is connected to the first input terminal of the secondary channel 12, and the second terminal of the fifth switch M5 is connected to the first terminal of the sixth switch M6. The control terminal of the sixth switch M6 is connected to the controller, and the second terminal of the sixth switch M6 is also connected to the second input terminal of the secondary channel 12. The first end of the filter capacitor C2 is connected to the first input terminal of the secondary channel 12, and the second end of the filter capacitor C2 is connected to the second input terminal of the secondary channel 12. It should be noted that the controller and its connection to each switching transistor are not shown in the diagram.

[0082] In this embodiment, the resonant inductor L, the resonant capacitor C1, and the secondary side of the high-frequency transformer T are connected, and the resonant inductor L, the resonant capacitor C1, and the leakage inductance of the high-frequency transformer T can form a series resonance.

[0083] The fifth switch M5 and the sixth switch M6 form a half-bridge circuit. The controller can control the current output by controlling the on and off of the fifth switch M5 and the sixth switch M6.

[0084] It should be noted that when the primary channel 11 is running in hiccup mode, if the control secondary bridge arm circuit 113 is turned off during a preset period, the controller will control the fifth switch M5 and the sixth switch M6 to be turned off during the preset period.

[0085] The filter capacitor C2 can act as a filter to filter the current ripple at the switching frequency.

[0086] In some embodiments, such as Figure 5b As shown, the resonant circuit 112 includes a resonant inductor L and a resonant capacitor C1. The secondary bridge arm circuit 113 includes a fifth switch M5, a sixth switch M6, and filter capacitors C2, C3, and C4. Among them, filter capacitors C3 and C4 are connected in series, and their common terminal is connected to the second terminal of the resonant capacitor C1.

[0087] In some embodiments, such as Figure 5cAs shown, the resonant circuit 112 includes a resonant inductor L, and the secondary bridge arm circuit 113 includes a fifth switch M5, a sixth switch M6, and filter capacitors C2, C3, and C4.

[0088] The resonant inductor L is connected to the secondary side of the high-frequency transformer T, and the leakage inductance of the resonant inductor L and the high-frequency transformer T can form a series resonance.

[0089] In some embodiments, such as Figure 5d As shown, the resonant circuit 112 includes a resonant inductor L and a resonant capacitor C1, and the secondary bridge arm circuit 113 includes a fifth switch M5, a sixth switch M6, and filter capacitors C2, C3, and C4.

[0090] The first terminal of the resonant inductor L is connected to the secondary side of the high-frequency transformer T, and the second terminal of the resonant inductor L is connected to the first terminal of the resonant capacitor C1. The second terminal of the resonant capacitor C1 is connected to the common terminal of the fifth switch M5 and the sixth switch M6 in the secondary bridge arm circuit 113. The resonant inductor L, the resonant capacitor C1, and the leakage inductance of the high-frequency transformer T can form a series resonance.

[0091] In some embodiments, such as Figure 5e As shown, the resonant circuit 112 includes a resonant inductor L and a resonant capacitor C1, and the secondary bridge arm circuit 113 includes a fifth switch M5, a sixth switch M6, a ninth switch M9, a tenth switch M10, and a filter capacitor C2.

[0092] The first terminal of the resonant inductor L is connected to the first terminal of the secondary side of the high-frequency transformer T. The second terminal of the resonant inductor L is connected to the first terminal of the resonant capacitor C1. The second terminal of the resonant capacitor C1 is connected to the common terminal of the fifth switch M5 and the sixth switch M6 in the secondary bridge arm circuit 113. The second terminal of the secondary side of the high-frequency transformer T is connected to the common terminal of the ninth switch M9 and the tenth switch M10. The resonant inductor L, the resonant capacitor C1, and the leakage inductance of the high-frequency transformer T can form a series resonance.

[0093] In some embodiments, such as Figure 5f As shown, the resonant circuit 112 includes a resonant inductor L and a resonant capacitor C1, and the secondary bridge arm circuit 113 includes a fifth switch M5, a sixth switch M6, and filter capacitors C2, C3, and C4.

[0094] The resonant circuit 112 is located on the primary side of the high-frequency transformer T. The first terminal of the resonant inductor L is connected to the primary side bridge arm circuit 111, and the second terminal of the resonant inductor L is connected to the first terminal of the resonant capacitor C1. The second terminal of the resonant capacitor C1 is connected to the primary side of the high-frequency transformer T. The first terminal of the secondary side of the high-frequency transformer T is connected to the common terminal of the fifth switch M5 and the sixth switch M6 in the secondary side bridge arm circuit 113, and the second terminal of the secondary side of the high-frequency transformer T is connected to the common terminal of the filter capacitors C3 and C4 in the secondary side bridge arm circuit 113.

[0095] In some embodiments, such as Figure 5g As shown, the primary side bridge arm circuit 111 includes a half-bridge circuit, which includes a first switch M1 and a second switch M2. The resonant circuit 112 includes a resonant inductor L and a resonant capacitor C1. The secondary side bridge arm circuit 113 includes a fifth switch M5, a sixth switch M6, and filter capacitors C2, C3, and C4.

[0096] In some embodiments, such as Figure 5h As shown, the primary side bridge arm circuit 111 includes a half-bridge circuit, which includes a first switch M1 and a second switch M2. The resonant circuit 112 includes a resonant inductor L and resonant capacitors C0 and C1. The secondary side bridge arm circuit 113 includes a fifth switch M5, a sixth switch M6, and filter capacitors C2, C3, and C4.

[0097] The above embodiments provide various structures for primary-side bridge arm circuits, resonant circuits, and secondary-side bridge arm circuits. The resonant inductor and / or resonant capacitor in the resonant circuit form a series resonance with the high-frequency transformer, which enables the power conversion system to operate at high frequencies. Furthermore, the fifth and sixth switching transistors in the secondary-side bridge arm circuit cooperate with the primary-side bridge arm circuit to initially shape the output current of the high-frequency transformer so that the preset current waveform can be achieved after superposition in the secondary channels.

[0098] In one exemplary embodiment, such as Figure 6As shown, the secondary channel 12 includes a waveform expansion circuit, which includes a ninth switch M9, a tenth switch M10, an eleventh switch M11, and a twelfth switch M12. The control terminal of the ninth switch M9 is connected to the controller, the first terminal of the ninth switch M9 is connected to the first terminal of the filter capacitor C2, and the second terminal of the ninth switch M9 is connected to the first terminal of the tenth switch M10. The control terminal of the tenth switch M10 is connected to the controller, and the second terminal of the tenth switch M10 is connected to the second terminal of the filter capacitor C2. The control terminal of the eleventh switch M11 is connected to the controller, the first terminal of the eleventh switch M11 is connected to the first terminal of the filter capacitor C2, and the second terminal of the eleventh switch M11 is connected to the first terminal of the twelfth switch M12. The control terminal of the twelfth switch M12 is connected to the controller, and the second terminal of the twelfth switch M12 is connected to the second terminal of the filter capacitor C2. The common terminal of the ninth switch M9 and the tenth switch M10 is used to output AC power. The common terminal of the eleventh switch M11 and the twelfth switch M12 is used to output AC power. It should be noted that the controller and its connection to each switching transistor are not shown in the diagram.

[0099] In this embodiment, the output currents of multiple primary channels 11 are superimposed and input into the secondary channel 12. Furthermore, by controlling the switching on and off of the ninth switch M9, tenth switch M10, eleventh switch M11, and twelfth switch M12, the superimposed current can be shaped so that the output current is a sine wave throughout its entire cycle. The common terminal of the ninth switch M9 and the tenth switch M10, and the common terminal of the eleventh switch M11 and the twelfth switch M12 in the secondary channel 12 can be connected to the AC power grid or an AC load.

[0100] In the above embodiment, the secondary channel is composed of four switching transistors. By controlling the on and off of the switching transistors, the superimposed current of multiple primary channels can be shaped. When one or more primary channels are running in hiccup mode, the secondary channel can reduce output fluctuations and can continuously output a target AC current with a sine wave waveform throughout the entire cycle.

[0101] In one exemplary embodiment, such as Figure 7 As shown, a control method for a power conversion system is provided. Taking the application of this method to the controller of a power conversion system as an example, the method may include the following steps:

[0102] Step 201: Obtain the operating data of multiple primary channels.

[0103] The operating data of the primary channel includes at least one of the following: input voltage, input current, input power, output voltage, output current, output power, and operating power.

[0104] A power conversion system can be equipped with multiple sensors, each collecting different operating data. For example, a voltage sensor located at the input of a primary channel can collect the input voltage of that channel; a current sensor located at the input of a primary channel can collect the input current of that channel; a voltage sensor located at the output of a primary channel can collect the output voltage of that channel; and a current sensor located at the output of a primary channel can collect the output current of that channel.

[0105] The controller can acquire operating data such as input voltage, input current, output voltage, and output current from different sensors. It can also calculate the operating power of the first-level channel based on the input voltage, input current, output voltage, output current, and the output power of the DC source.

[0106] It should be noted that the methods for obtaining runtime data are not limited to the examples above. In practical applications, the controller can also use other methods to obtain runtime data.

[0107] Step 202: In response to the trigger signal, determine the control information of each primary channel based on the operating data of multiple primary channels.

[0108] The trigger signal is the signal that triggers the power conversion system to operate in hiccup mode.

[0109] When no trigger signal is received, the power conversion system operates in non-hiccup mode. Upon receiving a trigger signal, it analyzes the operating data of multiple primary channels in response to the signal. Based on the analysis results, it determines the operating state and duration of the primary channels operating in hiccup mode, and the operating mode of the primary channels not operating in hiccup mode. The control information for each primary channel is then obtained by summarizing this information.

[0110] Step 203: Based on the control information of each primary channel, control at least two primary channels to operate in hiccup mode, and make the secondary channel continuously output the target AC current.

[0111] After determining the control information for each primary channel, control commands are output to each primary channel according to the control information, so that at least two primary channels operate in hiccup mode. Furthermore, the superimposed current of multiple primary channels can be shaped by the secondary channel to form the target alternating current.

[0112] In the above embodiments, operating data of multiple primary channels are acquired; in response to a trigger signal, control information for each primary channel is determined based on the operating data of the multiple primary channels; based on the control information of each primary channel, at least two primary channels are controlled to operate in a hiccup mode, and the secondary channels continuously output the target AC current. The technical solution provided in this application embodiment can control the power conversion system to operate in a corresponding hiccup mode based on the operating data of the primary channels. This not only reduces the power loss of the power conversion system and improves its conversion efficiency, but also allows for continuous output of AC current through the superposition of currents from multiple primary channels and rectification by the secondary channels.

[0113] In an exemplary embodiment, "controlling at least two primary channels to operate in hiccup mode" in the above embodiment may include: controlling at least one primary channel to be turned off or to operate in a low-power state during a first preset time period.

[0114] The first preset time period can be of any length; or, the first preset time period can be one or more half-AC cycles, and the preset time period for each primary channel can be different. Optionally, the first preset time periods for some primary channels can overlap.

[0115] by Figure 6 Taking a power conversion system as an example, controlling at least one primary channel to be shut down or operate in a low-power state during a first preset time period can include: controlling the primary channel with output current Io1 to shut down every half AC cycle; controlling the primary channels with output current Io2 and Io3 to operate at low power throughout the entire cycle. Alternatively, controlling the primary channel with output current Io1 to shut down in half an AC cycle t1 and operate at low power in half AC cycles t2 and t3; controlling the primary channel with output current Io2 to shut down in half an AC cycle t2 and operate at low power in half AC cycles t1 and t3; and controlling the primary channel with output current Io3 to shut down in half an AC cycle t3 and operate at low power in half AC cycles t1 and t2. Alternatively, the primary channel controlling the output current Io1 is shut off during half-AC cycles t1 and t2, and operates at low power during half-AC cycle t3; the primary channel controlling the output current Io2 is shut off during half-AC cycles t2 and t3, and operates at low power during half-AC cycle t1; and the primary channel controlling the output current Io3 is shut off during half-AC cycles t1 and t3, and operates at low power during half-AC cycle t2.

[0116] It should be noted that the hiccup operation mode of each primary channel is not limited to the above example and can be set according to the actual situation.

[0117] In the above embodiments, at least one primary channel is preferably directly shut down during a preset time period. This is because switching losses and conduction losses exist during the switching process of the switching transistor. By controlling at least one primary channel to be shut down during the first preset time period, these losses can be reduced, allowing the system to operate in a higher efficiency range.

[0118] In an exemplary embodiment, the method further includes: determining the duration of a first preset time period based on the operating data of each primary channel; and increasing the duration of the first preset time period when the operating data of the primary channel decreases.

[0119] The duration of each primary channel's shutdown or low-power operation is determined based on its operating data. Understandably, the controller can detect the output power of the DC source connected to each primary channel, or detect the operating power of each primary channel, to determine the operating data of the primary channel; if it is determined that the operating data of a primary channel is decreasing, the duration of the primary channel's shutdown or low-power operation can be increased.

[0120] Increasing the time for the first-level channel to be off or to operate at low power can be achieved by increasing the off time of the switching transistor in the first-level channel.

[0121] In the above embodiments, when the operating data of the first-level channel is low, increasing the duration of the first-level channel's shutdown or low-power operation allows for more efficient storage of energy from the input source. By extending the preset time period, the switching transistors in the power conversion system can switch on and off less frequently, reducing switching losses. Simultaneously, reducing losses from frequent switching helps decrease device heat generation and improve system durability. Appropriately extending the energy storage time can reduce fluctuations in output voltage and current, resulting in a smoother output. During energy release, since the energy has been effectively pre-stored, the output efficiency of the power conversion system is improved, thereby reducing overall energy loss. By dynamically adjusting the length of the preset time period, system efficiency can be further improved.

[0122] In an exemplary embodiment, "controlling at least two primary channels to operate in hiccup mode" in the above embodiment includes controlling at least two primary channels to turn off in turn during the zero-crossing period.

[0123] The zero-crossing period includes the zero-crossing point of the output AC voltage of the power conversion system. Optionally, the zero-crossing period may include a zero-crossing phase of ±10°.

[0124] Still with Figure 6 Taking a power conversion system as an example, controlling at least two primary channels to alternately shut down during the zero-crossing period can include: controlling the primary channel with output current Io1 to shut down during the zero-crossing period, and controlling the primary channels with output current Io2 and Io3 to operate at low power throughout the entire cycle. Alternatively, as... Figure 10c As shown, the primary channel controlling the output current Io1 is turned off during the zero-crossing period t0 and operates at low power during the non-zero-crossing period. The primary channel controlling the output current Io2 is turned off during the zero-crossing period t0' and operates at low power during the non-zero-crossing period. Alternatively, the primary channel controlling the output current Io1 is turned off during the zero-crossing period t0, and the primary channel controlling the output current Io2 is turned off during the zero-crossing period t0'.

[0125] It should be noted that the hiccup operation mode of each primary channel is not limited to the above example and can be set according to the actual situation.

[0126] In the above embodiments, at least two primary channels are turned off alternately during the zero-crossing period. Compared to a scheme where only one primary channel is turned off during the zero-crossing period, the alternating shutdown of the two primary channels can effectively distribute the losses of the switching transistors, thereby extending their service life. Furthermore, this design also helps to achieve a more uniform load distribution, optimize system performance, and improve overall reliability.

[0127] In one exemplary embodiment, the working status and corresponding working duration of each primary channel can be determined based on the operating data of multiple primary channels.

[0128] In an exemplary embodiment, the states of the primary channel include high-power operation, low-power operation, and off; the duration of each state is N half-AC cycles, where N is a positive integer and can be variable.

[0129] Based on the above principles, it is possible to determine whether each primary channel is operating at high power, low power, or off, as well as the duration of high power operation, low power operation, and off operation.

[0130] The operating status of each primary channel corresponds to its operating data. In one embodiment, if the operating power of a primary channel is low, the high-power operation time of that primary channel is short, and the low-power operation or shutdown time is long. If the operating data of a primary channel is high, the high-power operation time of that primary channel is long, and the low-power operation or shutdown time is short.

[0131] In the above embodiments, the working status and working time of each primary channel are determined based on the operating data of each primary channel. The hiccup control method can be dynamically adjusted in a timely manner according to the actual operating power of the primary channel or the output of the DC source connected to the primary channel, so as to ensure stable system operation, improve conversion efficiency, and reduce system losses.

[0132] In one exemplary embodiment, such as Figure 8 As shown, in the above embodiment, "determining the control information of each primary channel based on the operating data of multiple primary channels" may include the following steps:

[0133] Step 301: Determine the power allocation of each primary channel within the second preset time period based on the operating data of multiple primary channels.

[0134] Within the second preset time period, the sum of the distributed power of all primary channels reaches the target power of the power conversion system. The second preset time period can be each half-AC cycle of the target AC current, or it can be multiple half-AC cycles of the target AC current, such as... Figure 10a As shown, the second preset time period can be each t1 time period or each t2 time period, or it can be two t1 time periods and two t2 time periods. The distributed power is positively correlated with the current magnitude. Within each half-AC cycle, the sum of the distributed power of all primary channels reaches the target power of the power conversion system, and the trend of the sum of the distributed power is the same as that of the superimposed current.

[0135] After acquiring the operating data of each primary channel, the controller analyzes and calculates the operating data of multiple primary channels. For example, it substitutes the operating data into a preset formula for calculation and interpolates the calculation results according to the parameters of the pre-set working point of the primary channel. This allows the real-time processing power of multiple primary channels to be redistributed when at least one primary channel is running in hiccup mode. The redistributed power enables the secondary channel to continuously provide the required output without being affected by hiccup mode.

[0136] Step 302: Determine the control information of each primary channel based on the power distribution of each primary channel within a preset time period.

[0137] After determining the power allocation, based on the power allocation of each primary channel in the preset time period, it is determined whether each primary channel is turned off during the preset time period, as well as the current and power magnitude during the preset time period, thus obtaining the control information of the primary channel.

[0138] like Figure 10a As shown, the output current is I. o1 The primary channel operates throughout each half-AC cycle, and reduces its output current every half-AC cycle. The output current is I. o2 The primary channel is shut down once every one and a half AC cycles.

[0139] In the above embodiments, the power allocation of each primary channel within a preset time period is determined based on the operating data of multiple primary channels; and the control information of each primary channel is determined based on the power allocation of each primary channel within the preset time period. In the technical solution of this application embodiment, the power redistribution of each primary channel is based on the target power required by the power conversion system. This allows the total power of the power conversion system to meet the demand. Furthermore, during hiccup mode operation, the shut-down primary channels do not generate power loss, or their power loss is reduced. Therefore, the overall power loss of the power conversion system can be reduced. With the total power meeting the demand and power loss reduced, the power conversion efficiency of the power conversion system can be improved.

[0140] In one exemplary embodiment, such as Figure 9 As shown, the second preset time period includes multiple half-AC cycles. In the above embodiment, "determining the control information of each primary channel based on the power distribution of each primary channel within the preset time period" may include the following steps:

[0141] Step 401: Divide the primary channels according to the power distribution of each primary channel in each half-AC cycle to obtain at least two types of primary channels.

[0142] After determining the power allocation for each primary channel in each half-AC cycle, multiple primary channels can be assigned to primary channels of different control types based on the magnitude of the allocated power, thereby allowing different control methods to be used for different types of primary channels.

[0143] For example, primary channels operating in hiccup mode are classified as Category I primary channels, and primary channels not operating in hiccup mode are classified as Category II primary channels. Alternatively, primary channels operating in hiccup mode during the first half of the AC cycle are classified as Category I primary channels, and primary channels operating in hiccup mode during the second half of the AC cycle are classified as Category II primary channels.

[0144] It should be noted that, based on the power allocation of multiple primary channels, more control types of primary channels can be defined, not limited to the first type and the second type of primary channels mentioned above.

[0145] Step 402: Determine the control information for each type of primary channel based on the power distribution of each type of primary channel in each half-AC cycle.

[0146] Taking at least two types of primary channels, including a first-type primary channel and a second-type primary channel, as an example, after determining the power allocation of the first-type primary channel in each half-AC cycle, the control information for the first-type primary channel can be obtained based on this power allocation, determining whether the first-type primary channel is turned off in each half-AC cycle, as well as the current and power magnitudes in each half-AC cycle. Similarly, after determining the power allocation of the second-type primary channel in each half-AC cycle, the control information for the second-type primary channel can be obtained based on this power allocation, determining whether the second-type primary channel is turned off in each half-AC cycle, as well as the current and power magnitudes in each half-AC cycle.

[0147] Taking at least two types of primary channels, including the first type, the second type, and the third type, as an example, after determining the power distribution of each type of primary channel in each half-AC cycle, the control information of the first type, the second type, and the third type of primary channels can be determined based on the power distribution, such as whether the first type, the second type, and the third type of primary channels are turned off in each half-AC cycle, as well as the current and power in each half-AC cycle.

[0148] In some embodiments, at least one of the at least two types of primary channels operates during each half-AC cycle. Understandably, if at least one type of primary channel operates during each half-AC cycle, the sum of the output currents of the multiple primary channels will remain greater than zero, meaning there is always current input to the secondary channels, thus ensuring that the secondary channels can output continuous current.

[0149] In the above embodiments, at least two types of primary channels are obtained by dividing them according to the power allocation of each primary channel in each half-AC cycle; control information for each type of primary channel is determined based on the power allocation of each type of primary channel in each half-AC cycle. In the technical solution of this application embodiment, the control type is divided according to the redistributed power, which can accurately control each primary channel, thereby greatly improving the power conversion efficiency of the power conversion system.

[0150] by Figure 6 Taking a power conversion system as an example, the control method provided by this invention can control the currents (Io1, Io2, Io3) on the first-stage channel to be... Figure 10a — Figure 10j The current waveform shown is shown.

[0151] like Figure 10a As shown, the primary channel of output current Io1 operates at high power in half AC cycle t1 and at low power in half AC cycle t2, while the primary channel of output current Io2 is turned off in half AC cycle t1 and operates at low power in half AC cycle t2.

[0152] like Figure 10bAs shown, the primary channel of output current Io1 is turned off in half AC cycle t1 and operates at high power in half AC cycle t2; the primary channel of output current Io2 operates at high power in half AC cycle t1 and is turned off in half AC cycle t2.

[0153] like Figure 10c As shown, the primary channel of output current Io1 is closed during the zero-crossing period t0, operates at the first power during the zero-crossing period t0', and operates at the second power during the non-zero-crossing period; the primary channel of output current Io2 operates at the third power during the zero-crossing period t0, is closed during the zero-crossing period t0', and operates at the fourth power during the non-zero-crossing period.

[0154] like Figure 10d As shown, the primary channel of output current Io1 is turned off in half AC cycle t1 and operates in half AC cycles t2 and t3, while the primary channel of output current Io2 operates in half AC cycle t1 and is turned off in half AC cycles t2 and t3.

[0155] like Figure 10e As shown, the primary channel of output current Io1 operates at low power during half-AC cycles t1 and t4, and at high power during half-AC cycles t2, t3, and t5. The primary channel of output current Io2 operates at low power during half-AC cycles t1 and t4, and is turned off during half-AC cycles t2, t3, and t5.

[0156] like Figure 10f As shown, the primary channel of output current Io1 operates at low power throughout the entire cycle t1, the primary channel of output current Io2 operates at low power during half of the AC cycle t1 and is turned off during half of the AC cycle t2, and the primary channel of output current Io3 is turned off during half of the AC cycle t1 and operates at low power during half of the AC cycle t2.

[0157] like Figure 10g As shown, the primary channel of output current Io1 operates at low power during the entire cycle t1, the primary channel of output current Io2 operates at low power during half AC cycles t1 and t2 and is turned off during half AC cycle t3, and the primary channel of output current Io3 is turned off during half AC cycles t1 and t2 and operates at low power during half AC cycle t3.

[0158] like Figure 10h As shown, the primary channel of output current Io1 is shut off during half-AC cycles t1 and t3, and operates at low power during half-AC cycle t2. The primary channel of output current Io2 operates at low power during half-AC cycle t1, and is shut off during half-AC cycles t2 and t3. The primary channel of output current Io3 is shut off during half-AC cycles t1 and t2, and operates at low power during half-AC cycle t3.

[0159] like Figure 10iAs shown, the primary channel of output current Io1 operates at low power during half-AC cycles t1 and t2, and is turned off during half-AC cycle t3. The primary channel of output current Io2 operates at low power during half-AC cycles t1 and t3, and is turned off during half-AC cycle t2. The primary channel of output current Io3 is turned off during half-AC cycle t1, and operates at low power during half-AC cycles t2 and t3.

[0160] like Figure 10j As shown, the primary channel of output current Io1 operates at low power during half-AC cycles t1-t5 and is turned off during half-AC cycle t6. The primary channel of output current Io2 is turned off during half-AC cycles t1 and t2 and operates at low power during half-AC cycles t3-t6. The primary channel of output current Io3 operates at low power during half-AC cycles t1, t2, and t6 and is turned off during half-AC cycles t3-t5.

[0161] The above embodiments provide a variety of hiccup operation modes, which enable the power conversion system to achieve a variety of conversion functions and adapt to a variety of application scenarios.

[0162] In some embodiments, the waveform of the output current of each primary channel 11 is a wavy wave during operation; the waveform of the superimposed current of multiple primary channels 11 is a wavy wave throughout the entire cycle, and the peak value of each wavy wave is the same; the output current of the secondary channel 12 is a sine wave throughout the entire cycle.

[0163] like Figure 10a As shown, the output current I of channel 11 is... o1 The waveform in each cycle is a steampuff wave, and the output current I of channel 11 is... o2 During the operating period, the waveform is a flat wave, and during the off period, the current and voltage values ​​are constant at 0. The waveform of the superimposed current Ii from multiple primary channels 11 is a flat wave throughout the entire cycle, and the peak value of each flat wave is the same. The secondary channel 12 shapes the superimposed current Ii, and the resulting output current is a sine wave throughout the entire cycle.

[0164] In an exemplary embodiment, the conditions for generating the trigger signal include at least one of the following: the operating data of one or more primary channels is lower than a preset data threshold; the power conversion rate of one or more primary channels is lower than a preset conversion rate threshold; and the output power of the secondary channel is lower than a preset power threshold.

[0165] In this embodiment, after acquiring the operating data of multiple primary channels, the controller compares the operating data of each primary channel with a preset data threshold. If the operating data of one or more primary channels is lower than the preset data threshold, it is determined that the power conversion system can operate in hiccup mode. For example, if the output current of one primary channel is lower than a preset current threshold, then that primary channel can operate in hiccup mode.

[0166] Alternatively, the controller calculates the power conversion efficiency of each primary channel based on the operating data. If the power conversion efficiency of one or more primary channels is lower than the preset conversion efficiency threshold, it indicates that the power conversion system is operating in a low-efficiency range. At this time, the conversion efficiency is low and the energy consumption is high. Therefore, it is determined that the power conversion system can be operated in hiccup mode.

[0167] Alternatively, the controller calculates the output power of the secondary channel. If the output power of the secondary channel is lower than the preset power threshold, it indicates that the power conversion of the power conversion system has not met the requirements, and the power conversion system can be operated in hiccup mode.

[0168] It should be noted that the conditions for generating the trigger signal are not limited to the examples above. In practical applications, other conditions can also be used to generate the trigger signal.

[0169] In the above embodiments, the conditions for generating the trigger signal include at least one of the following: the operating data of one or more primary channels is lower than a preset data threshold; the power conversion efficiency of one or more primary channels is lower than a preset conversion efficiency threshold; and the output power of the secondary channel is lower than a preset power threshold. This application provides various trigger signal generation conditions, enabling the power conversion system to operate in a hiccup mode under various conditions, thereby improving the power conversion efficiency of the power conversion system.

[0170] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0171] In one exemplary embodiment, a controller is provided, the internal structure of which can be shown in the following diagram. Figure 11As shown, the controller includes a processor, memory, input / output (I / O) interfaces, and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the I / O interfaces. The processor provides computational and control capabilities. The controller's memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and a database. The internal memory provides the environment for the operating system and computer programs stored in the non-volatile storage media. The controller's database stores control data for the power conversion system. The controller's I / O interfaces are used for exchanging information between the processor and external devices. The controller's communication interface is used for communication with external terminals via a network connection. When the computer program is executed by the processor, it implements a control method for the power conversion system.

[0172] Those skilled in the art will understand that Figure 11 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0173] In one exemplary embodiment, a non-transitory computer-readable storage medium including instructions is also provided, such as a memory including instructions that can be executed by a processor of an electronic device to perform the above-described method. For example, the non-transitory computer-readable storage medium may be a ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, and optical data storage device, etc.

[0174] In one exemplary embodiment, a computer program product is also provided, which, when executed by a processor, can implement the above-described methods. The computer program product includes one or more computer instructions. When these computer instructions are loaded and executed on a computer, some or all of the above-described methods can be implemented, wholly or partially, according to the processes or functions described in the embodiments of this application.

[0175] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments described above. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile 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 many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0176] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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 specification.

[0177] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A control method for a power conversion system, characterized in that, The power conversion system includes: Multiple primary channels and a shared secondary channel, wherein the input terminal of each primary channel is connected to a DC source, and at least two primary channels are connected to different DC sources, and the output terminals of the multiple primary channels are connected in parallel and connected to the secondary channel; The control method includes: Obtain operational data from multiple primary channels; In response to a trigger signal, control information for each of the primary channels is determined based on the operating data of the multiple primary channels; Based on the control information of each primary channel, at least two of the primary channels are controlled to operate in hiccup mode, and the secondary channel is made to continuously output the target AC current.

2. The method according to claim 1, characterized in that, The control of at least two of the primary channels to operate in hiccup mode includes: Control at least one of the primary channels to be shut down or operated in a low-power state during a first preset time period.

3. The method according to claim 2, characterized in that, Further includes: The duration of the first preset time period is determined based on the operating data of each of the primary channels; When the operating data of the primary channel decreases, the duration of the first preset time period is increased.

4. The method according to claim 1, characterized in that, The control of at least two of the primary channels to operate in hiccup mode includes: Control at least two of the primary channels to turn off alternately during the zero-crossing period, which includes the zero-crossing point of the output AC voltage of the power conversion system.

5. The method according to claim 1, characterized in that, The step of determining the control information for each primary channel based on the operating data of multiple primary channels includes: The working status and corresponding working duration of each primary channel are determined based on the operating data of multiple primary channels.

6. The method according to claim 5, characterized in that, The status of the primary channel includes high-power operation, low-power operation, and off; The operating duration of each state is N half-AC cycles, where N is a positive integer and can vary.

7. The method according to claim 1, characterized in that, The step of determining the control information for each primary channel based on the operating data of multiple primary channels includes: Based on the operating data of multiple primary channels, the power allocation of each primary channel within a second preset time period is determined; wherein, the sum of the power allocation of all primary channels within the second preset time period reaches the target power of the power conversion system; The control information of each primary channel is determined based on the power allocation of each primary channel during the second preset time period.

8. The method according to claim 7, characterized in that, The second preset time period includes multiple half-AC cycles. Determining the control information of each primary channel based on its allocated power within the second preset time period includes: Based on the power distribution of each primary channel in each half-AC cycle, at least two types of primary channels are obtained; Based on the power distribution of each primary channel in each half-AC cycle, the control information for each primary channel is determined. Among them, at least one of the at least two types of primary channels operates in each half-AC cycle.

9. The method according to any one of claims 1-8, characterized in that, The waveform of the output current of each primary channel is a steaming wave during operation; The waveform of the superimposed current of multiple primary channels is a bun wave throughout the entire cycle, and the peak value of each bun wave is the same. The output current of the secondary channel is a sine wave throughout the entire cycle.

10. The method according to any one of claims 1-8, characterized in that, The conditions for generating the trigger signal include at least one of the following: The operating data of one or more of the primary channels is lower than a preset data threshold; The power conversion efficiency of one or more of the primary channels is lower than a preset conversion efficiency threshold; The output power of the secondary channel is lower than a preset power threshold.

11. The method according to any one of claims 1-8, characterized in that, The operating data of the primary channel includes at least one of the following: input voltage, input current, input power, output voltage, output current, output power, and operating power.

12. The method according to any one of claims 1-8, characterized in that, There are no energy buffer capacitors at the connection points of the primary channels and the secondary channels.

13. The method according to any one of claims 1-8, characterized in that, The primary channel includes the primary side bridge arm circuit, the high-frequency transformer, the resonant circuit, and the secondary side bridge arm circuit.

14. A controller comprising a memory and a processor, the memory storing a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 13.

15. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 13.

16. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 13.

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