Voltage conversion circuit control method, electronic device, and storage medium

Abstract

The embodiment of the present disclosure provides a voltage conversion circuit control method, an electronic device and a storage medium, which comprises: a first isolation transformer module outputs a first voltage signal in a first half cycle based on a first control signal of a control module; a first isolation switch module turns on a first connection between the first isolation transformer module and a first filter module in the first half cycle and turns off the first connection in a second half cycle based on the control of the control module; a second isolation transformer module outputs a second voltage signal in the second half cycle based on a second control signal of the control module; a second isolation switch module turns on a second connection between the second isolation transformer module and a second filter module in the second half cycle based on the control of the control module; and the filter module is used for filtering the voltage signal to obtain an alternating voltage signal.

Description

Technical Field

[0001] This invention relates to the field of power transformation, and in particular to a voltage conversion circuit control method, electronic device, and storage medium. Background Technology

[0002] Existing photovoltaic grid-connected inverters typically boost the DC output from photovoltaic modules into high-voltage DC, then chop it into a 50Hz sine wave via an H-bridge, and finally transmit it to the grid through an inductor-capacitor-inductor (LCL) filter circuit. The high-voltage side inverter H-bridge has the risk of shoot-through and short circuit of the metal-oxide-semiconductor field-effect transistor (MOSFET) in the same bridge arm. When there are four MOSFETs in the H-bridge hard switching, it will cause high-frequency switching losses and high-frequency electromagnetic radiation. Summary of the Invention

[0003] This disclosure provides a voltage conversion circuit control method, an electronic device, and a storage medium.

[0004] According to a first aspect of the present disclosure, a voltage conversion circuit is provided, characterized in that the voltage conversion circuit includes:

[0005] A detection module is used to detect circuit parameters, wherein the circuit parameters include at least one of the following: a first half-cycle and a second half-cycle of alternating current, wherein the first half-cycle is different from the second half-cycle;

[0006] The control module is used to control at least one of the first isolation transformer module, the first isolation switch module, the second isolation transformer module, and the second isolation switch module according to the circuit parameters.

[0007] The first isolation transformer module is used to output a first voltage signal in the first half-cycle based on the first control signal of the control module and the input DC voltage signal.

[0008] The first isolating switch module is used to, based on the control of the control module, conduct the first connection between the first isolating transformer module and the first filter module in the first half-cycle, and disconnect the first connection in the second half-cycle.

[0009] The first filtering module is used to input a first voltage signal through the first connection during the first half-cycle, filter the first voltage signal to obtain a first AC voltage signal, and output the first AC voltage signal to the AC power grid.

[0010] The second isolation transformer module is used to output a second voltage signal in the second half-cycle based on the second control signal of the control module and the input DC voltage signal.

[0011] The second isolating switch module is used to, based on the control of the control module, conduct a second connection between the second isolating transformer module and the second filter module in the second half-cycle, and to disconnect the second connection in the first half-cycle.

[0012] The second filtering module is used to input a second voltage signal through the second connection during the second half-cycle, filter the second voltage signal to obtain a second AC voltage signal, and output the second AC voltage signal to the AC power grid.

[0013] In some embodiments, the first isolation transformer module includes: a first full-bridge circuit, a first transformer, and a first full-wave rectifier circuit;

[0014] The first full-bridge circuit is used to convert the DC voltage signal into a first square wave voltage signal in the first half-cycle based on the first sinusoidal pulse width modulation signal of the control module, and input the first square wave voltage signal to the first primary winding of the first transformer. The first control signal includes the first sinusoidal pulse width modulation signal.

[0015] The first full-wave rectifier circuit is used to perform full-wave rectification on the first induced voltage signal output by the first secondary winding of the first transformer inducing the first square wave voltage, so as to obtain the first voltage signal.

[0016] The second isolation transformer module includes: a second full-bridge circuit, a second transformer, and a second full-wave rectifier circuit;

[0017] The second full-bridge circuit is used to convert the DC voltage signal into a second square wave voltage signal in the second half-cycle based on the second sinusoidal pulse width modulation signal of the control module, and input the second square wave voltage signal to the second primary winding of the second transformer; the first control signal includes the second sinusoidal pulse width modulation signal;

[0018] The second full-wave rectifier circuit is used to perform full-wave rectification on the second induced voltage signal output by the second square wave voltage induced by the second secondary winding of the second transformer to obtain the second voltage signal.

[0019] In some embodiments, the first transformer and the second transformer are the same transformer, the first primary winding and the second primary winding are the same primary winding, and the first full-bridge circuit and the second full-bridge circuit are the same full-bridge circuit; the first transformer includes a first secondary winding and a second secondary winding.

[0020] The first full-bridge circuit is configured to convert the DC voltage signal into a first square wave voltage signal in the first half-cycle based on the first sinusoidal pulse width modulation signal, and input the first square wave voltage signal into the first primary winding; and to convert the DC voltage signal into a second square wave voltage signal in the second half-cycle based on the second sinusoidal pulse width modulation signal, and input the second square wave voltage signal into the first primary winding.

[0021] The first full-wave rectifier circuit is used to perform full-wave rectification on the first induced voltage signal output by the first secondary winding induced by the first square wave voltage to obtain the first voltage signal.

[0022] The second full-wave rectifier circuit is used to perform full-wave rectification on the second induced voltage signal output by the second secondary winding inducing the second square wave voltage, so as to obtain the second voltage signal.

[0023] In some embodiments, the first isolation transformer module includes: a first flyback isolation circuit consisting of a first switching transistor, a third transformer, and a first rectifier diode, wherein the first switching transistor is connected to a first end of the third primary winding of the third transformer, the second end of the third primary winding receives the DC voltage signal, and the first rectifier diode is connected to the third secondary winding of the third transformer; the first flyback isolation circuit converts the DC voltage signal into the first voltage signal in the first half-cycle based on the third sinusoidal pulse width modulation signal input by the control module to the first switching transistor;

[0024] The second isolation transformer module includes: a second flyback isolation circuit consisting of a second switching transistor, a fourth transformer, and a second rectifier diode, wherein the second switching transistor is connected to the first end of the fourth primary winding of the fourth transformer, the second end of the fourth primary winding is input with the DC voltage signal, the second rectifier diode is connected to the fourth secondary winding of the fourth transformer, and the second flyback isolation circuit converts the DC voltage signal into the second voltage signal in the second half-cycle based on the fourth sinusoidal pulse width modulation signal input by the control module to the second switching transistor;

[0025] The first control signal includes the third sinusoidal pulse width modulation signal and the fourth sinusoidal pulse width modulation signal.

[0026] In some embodiments, the first disconnecting switch module includes: a third flyback isolation circuit consisting of a third switching transistor, a fifth transformer, and a third rectifier diode, and a fourth switching transistor, wherein the third switching transistor is connected to a first end of the fifth primary winding of the fifth transformer, the second end of the fifth primary winding is input with the DC voltage signal, the third rectifier diode is connected to the fifth secondary winding of the fifth transformer, and the third flyback isolation circuit outputs a first disconnecting switch signal to the fourth switching transistor based on a first switching signal input to the third switching transistor by the control module, so as to turn on or off the first connection;

[0027] The second disconnecting switch module includes: a fourth flyback isolation circuit consisting of a fifth switching transistor, a sixth transformer, and a fourth rectifier diode, and a sixth switching transistor. The fifth switching transistor is connected to the first end of the sixth primary winding of the sixth transformer, and the second end of the sixth primary winding is input with the DC voltage signal. The fourth rectifier diode is connected to the sixth secondary winding of the sixth transformer. The fourth flyback isolation circuit outputs a second disconnecting switch signal to the sixth switching transistor based on the second switching signal input to the fifth switching transistor by the control module, so as to turn on or off the second connection.

[0028] In some embodiments, the voltage conversion circuit further includes: a first voltage regulator module, used to regulate the DC voltage signal input to the second terminal of the fifth primary winding and the second terminal of the sixth primary winding.

[0029] In some embodiments, the voltage conversion circuit further includes at least one of the following: a second voltage regulator module and a third voltage regulator module;

[0030] The second voltage regulator module is connected between the third rectifier diode and the fourth switch transistor, and is used to regulate the voltage of the first isolation switch signal;

[0031] The third voltage regulator module is connected between the fourth rectifier diode and the sixth switch transistor, and is used to regulate the voltage of the second isolation switch signal.

[0032] In some embodiments, the first filtering module includes a first inductor-capacitor LC filter circuit;

[0033] The second filtering module includes a second inductor-capacitor LC filter circuit.

[0034] In some embodiments, the first inductor of the first inductor-capacitor LC filter circuit and the second inductor of the second inductor-capacitor LC filter circuit are the same inductor.

[0035] In some embodiments, the circuit parameters further include at least one: the current value corresponding to the first AC voltage signal, and the current value corresponding to the second AC voltage signal;

[0036] The control module is used for at least one of the following:

[0037] Based on the current value corresponding to the first AC voltage signal, the duty cycle of the first control signal is adjusted to adjust the first voltage signal;

[0038] Based on the current value corresponding to the second AC voltage signal, the duty cycle of the second control signal is adjusted to adjust the second voltage signal.

[0039] According to a second aspect of the present disclosure, a photovoltaic junction box is provided, including the voltage conversion circuit described in the first aspect.

[0040] According to a third aspect of the present disclosure, a photovoltaic module is provided, including the voltage conversion circuit described in the first aspect, or the photovoltaic junction box described in the second aspect.

[0041] According to a fourth aspect of the present disclosure, a voltage conversion circuit control method is applied to a control module in a voltage conversion circuit, wherein the voltage conversion circuit further includes: a first isolation transformer module, a first isolation switch module, a first filter module, a second isolation transformer module, a second isolation switch module, and a second filter module; the method includes:

[0042] Obtain circuit parameters, wherein the circuit parameters include one of the following: the first half-cycle and the second half-cycle of the alternating current, wherein the first half-cycle is different from the second half-cycle;

[0043] The circuit parameters are determined to be the first half-cycle;

[0044] Sending a first control signal controls the first isolation transformer module of the voltage conversion circuit to output a first voltage signal according to the input DC voltage signal during the first half-cycle;

[0045] The first isolating switch module is controlled to connect the first connection between the first isolating transformer module and the first filter module. The first filter module is used to input a first voltage signal through the first connection and filter the first voltage signal to obtain a first AC voltage signal during the first half-cycle, and output the first AC voltage signal to the AC power grid.

[0046] The control second isolating switch module disconnects the second connection between the second isolating transformer module and the second filtering module. The second filtering module is used to input a second voltage signal through the second connection during the second half-cycle, filter the second voltage signal to obtain a second AC voltage signal, and output the second AC voltage signal to the AC power grid.

[0047] In some embodiments, the method further includes:

[0048] The circuit parameters are determined to be the second half-cycle.

[0049] Send a second control signal to control the second isolation transformer module to output a second voltage signal according to the input DC voltage signal during the second half-cycle;

[0050] Control the first isolating switch module to shut off the first connection;

[0051] Control the second isolating switch module to connect the second connection.

[0052] In some embodiments, the first isolation transformer module includes: a first full-bridge circuit, a first transformer, and a first full-wave rectifier circuit;

[0053] The method of sending a first control signal to control the first isolation transformer module of the voltage conversion circuit to output a first voltage signal according to the input DC voltage signal in the first half-cycle includes: sending a first sinusoidal pulse width modulation signal, wherein the first sinusoidal pulse width modulation signal is used by the first full-bridge circuit to convert the DC voltage signal into a first square wave voltage signal in the first half-cycle, and inputting the first square wave voltage signal into the first primary winding of the first transformer, wherein the first control signal includes the first sinusoidal pulse width modulation signal;

[0054] The first induced voltage signal, which is output by the first secondary winding of the first transformer in response to the first square wave voltage, is rectified by the first full-wave rectifier circuit to obtain the first voltage signal.

[0055] The second isolation transformer module includes: a second full-bridge circuit, a second transformer, and a second full-wave rectifier circuit;

[0056] The step of sending a second control signal to control the second isolation transformer module to output a second voltage signal according to the input DC voltage signal in the second half-cycle includes: sending a second sinusoidal pulse width modulation signal, wherein the second sinusoidal pulse width modulation signal is used by the second full-bridge circuit to convert the DC voltage signal into a second square wave voltage signal in the second half-cycle, and inputting the second square wave voltage signal to the second primary winding of the second transformer; the first control signal includes the second sinusoidal pulse width modulation signal;

[0057] The second induced voltage signal, which is output by the second secondary winding of the second transformer in response to the second square wave voltage, is then rectified by the first full-wave rectifier circuit to obtain the second voltage signal.

[0058] In some embodiments, the first transformer and the second transformer are the same transformer, the first primary winding and the second primary winding are the same primary winding, and the first full-bridge circuit and the second full-bridge circuit are the same full-bridge circuit; the first transformer includes a first secondary winding and a second secondary winding.

[0059] Wherein, the first sinusoidal pulse width modulation signal is used by the first full-bridge circuit to convert the DC voltage signal into a first square wave voltage signal in the first half-cycle, and input the first square wave voltage signal into the first primary winding;

[0060] The first sinusoidal pulse width modulation signal is used by the first full-bridge circuit to convert the DC voltage signal into a second square wave voltage signal in the second half-cycle, and input the second square wave voltage signal into the first primary winding;

[0061] The first induced voltage signal, which is output by the first square wave voltage induced by the first secondary winding, is rectified by the first full-wave rectifier circuit to obtain the first voltage signal.

[0062] The second induced voltage signal, which is output by the second square wave voltage induced by the second secondary winding, is rectified by the second full-wave rectifier circuit to obtain the second voltage signal.

[0063] In some embodiments, the first isolation transformer module includes: a first flyback isolation circuit consisting of a first switching transistor, a third transformer, and a first rectifier diode, wherein the first switching transistor is connected to a first end of the third primary winding of the third transformer, the second end of the third primary winding is input with the DC voltage signal, and the first rectifier diode is connected to the third secondary winding of the third transformer.

[0064] The method of sending a first control signal to control the first isolation transformer module of the voltage conversion circuit to output a first voltage signal according to the input DC voltage signal in the first half-cycle includes: inputting a third sinusoidal pulse width modulation signal to the first switch, wherein the third sinusoidal pulse width modulation signal is used by the first flyback isolation circuit to convert the DC voltage signal into the first voltage signal in the first half-cycle.

[0065] The second isolation transformer module includes: a second flyback isolation circuit consisting of a second switching transistor, a fourth transformer, and a second rectifier diode, wherein the second switching transistor is connected to the first end of the fourth primary winding of the fourth transformer, the second end of the fourth primary winding is input with the DC voltage signal, and the second rectifier diode is connected to the fourth secondary winding of the fourth transformer.

[0066] The step of sending a second control signal to control the second isolation transformer module to output a second voltage signal according to the input DC voltage signal in the second half-cycle includes: inputting a fourth sinusoidal pulse width modulation signal to the second switch, and the third sinusoidal pulse width modulation signal is used by the second flyback isolation circuit to convert the DC voltage signal into the second voltage signal in the second half-cycle.

[0067] The first control signal includes the third sinusoidal pulse width modulation signal and the fourth sinusoidal pulse width modulation signal.

[0068] In some embodiments, the first disconnecting switch module includes: a third flyback isolation circuit composed of a third switching transistor, a fifth transformer, and a third rectifier diode, and a fourth switching transistor, wherein the third switching transistor is connected to the first end of the fifth primary winding of the fifth transformer, the second end of the fifth primary winding is input with the DC voltage signal, and the third rectifier diode is connected to the fifth secondary winding of the fifth transformer.

[0069] The control of the first isolating switch module to turn on or off the first connection includes: inputting a first switching signal to the third switching transistor, wherein the first switching signal is used by the third flyback isolation circuit to output a first isolating switch signal to the fourth switching transistor to turn on or off the first connection;

[0070] The second disconnecting switch module includes: a fourth flyback isolation circuit consisting of a fifth switching transistor, a sixth transformer, and a fourth rectifier diode, and a sixth switching transistor, wherein the fifth switching transistor is connected to the first end of the sixth primary winding of the sixth transformer, the second end of the sixth primary winding is input with the DC voltage signal, and the fourth rectifier diode is connected to the sixth secondary winding of the sixth transformer.

[0071] The control of the second disconnecting switch module to turn on or off the second connection includes: inputting a second switching signal to the fifth switching transistor, the second switching signal being used by the fourth flyback isolation circuit to output a second disconnecting switch signal to the sixth switching transistor to turn on or off the second connection.

[0072] In some embodiments, the voltage conversion circuit further includes: a first voltage regulator module, used to regulate the DC voltage signal input to the second terminal of the fifth primary winding and the second terminal of the sixth primary winding.

[0073] In some embodiments, the voltage conversion circuit further includes at least one of the following: a second voltage regulator module and a third voltage regulator module;

[0074] The second voltage regulator module is connected between the third rectifier diode and the fourth switch transistor, and is used to regulate the voltage of the first isolation switch signal;

[0075] The third voltage regulator module is connected between the fourth rectifier diode and the sixth switch transistor, and is used to regulate the voltage of the second isolation switch signal.

[0076] In some embodiments, the first filtering module includes a first inductor-capacitor LC filter circuit;

[0077] The second filtering module includes a second inductor-capacitor LC filter circuit.

[0078] In some embodiments, the first inductor of the first inductor-capacitor LC filter circuit and the second inductor of the second inductor-capacitor LC filter circuit are the same inductor.

[0079] In some embodiments, the circuit parameters further include at least one: the current value corresponding to the first AC voltage signal, and the current value corresponding to the second AC voltage signal;

[0080] The method further includes at least one of the following:

[0081] Based on the current value corresponding to the first AC voltage signal, the duty cycle of the first control signal is adjusted to adjust the first voltage signal;

[0082] Based on the current value corresponding to the second AC voltage signal, the duty cycle of the second control signal is adjusted to adjust the second voltage signal.

[0083] In some embodiments, the voltage conversion circuit further includes a detection module.

[0084] The acquisition of circuit parameters includes: acquiring the circuit parameters detected by the detection module.

[0085] According to a fifth aspect of the embodiments of this disclosure, an electronic device is provided, wherein the electronic device:

[0086] One or more processors;

[0087] The processor is used to invoke instructions to cause the electronic device to execute the voltage conversion circuit control method described in the fourth aspect.

[0088] According to a sixth aspect of the present disclosure, a storage medium is provided, wherein the storage medium stores instructions that, when executed on an electronic device, cause the electronic device to perform the voltage conversion circuit control method described in the fourth aspect.

[0089] The voltage conversion circuit control method provided in this embodiment includes a control module acquiring the first and second half-cycles of the AC current detected by the detection module. A first isolation transformer module outputs a first voltage signal during the first half-cycle based on a first control signal from the control module. A first disconnecting switch module, controlled by the control module, connects a first connection between the first isolation transformer module and the first filter module during the first half-cycle and disconnects the first connection during the second half-cycle. A second isolation transformer module outputs a second voltage signal during the second half-cycle based on a second control signal from the control module. A second disconnecting switch module, controlled by the control module, connects a second connection between the second isolation transformer module and the second filter module during the second half-cycle. A filter module filters the voltage signals to obtain an AC voltage signal. On one hand, the voltage conversion circuit can synchronize voltage conversion with the AC grid based on the monitoring of the AC current cycle by the detection module, meeting the requirements of grid-connected power generation. On the other hand, the first and second isolation transformer modules only need to transform half the amplitude of the AC current, improving transformation efficiency and reducing energy waste. Furthermore, the isolation transformer module isolates the AC grid when it is not outputting, reducing the probability of damage to the isolation transformer module from AC backflow and improving circuit safety. Attached Figure Description

[0090] Figure 1 This is a schematic diagram of a voltage conversion circuit according to an exemplary embodiment;

[0091] Figure 2 This is a schematic diagram of a voltage conversion circuit according to an exemplary embodiment;

[0092] Figure 3 This is a schematic diagram of a voltage conversion circuit according to an exemplary embodiment;

[0093] Figure 4 This is a schematic diagram of a voltage conversion circuit according to an exemplary embodiment;

[0094] Figure 5 This is a schematic diagram of a voltage conversion circuit according to an exemplary embodiment;

[0095] Figure 6This is a schematic diagram of a voltage conversion circuit according to an exemplary embodiment;

[0096] Figure 7 This is a schematic diagram of a voltage conversion circuit according to an exemplary embodiment;

[0097] Figure 8 This is a schematic diagram of a voltage conversion circuit according to an exemplary embodiment;

[0098] Figure 9 This is a schematic diagram of a voltage conversion circuit according to an exemplary embodiment;

[0099] Figure 10 This is a schematic diagram of a voltage conversion circuit according to an exemplary embodiment;

[0100] Figure 11 This is a schematic diagram of a voltage conversion circuit according to an exemplary embodiment;

[0101] Figure 12 This is a schematic diagram of a voltage conversion circuit according to an exemplary embodiment;

[0102] Figure 13 This is a schematic diagram of a voltage conversion circuit according to an exemplary embodiment;

[0103] Figure 14 This is a schematic flowchart illustrating a voltage conversion circuit control method according to an exemplary embodiment;

[0104] Figure 15 This is a schematic flowchart illustrating a voltage conversion circuit control method according to an exemplary embodiment;

[0105] Figure 16 This is a schematic flowchart illustrating a voltage conversion circuit control method according to an exemplary embodiment;

[0106] Figure 17 This is a schematic diagram of a voltage conversion circuit according to an exemplary embodiment;

[0107] Figure 18 This is a schematic diagram of a voltage conversion circuit according to an exemplary embodiment;

[0108] Figure 19 This is a schematic flowchart illustrating a voltage conversion circuit control method according to an exemplary embodiment;

[0109] Figure 20 This is a schematic diagram of the structure of an electronic device according to an exemplary embodiment. Detailed Implementation

[0110] To make the technical solution and beneficial effects of the present invention more apparent and understandable, a detailed description is provided below by listing specific embodiments. The accompanying drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show the details of the local features; unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this application pertains.

[0111] This disclosure is not exhaustive, but merely illustrative of some embodiments, and is not intended to limit the scope of protection of this disclosure. Unless otherwise specified, each step in a particular embodiment can be implemented as an independent embodiment, and the steps can be arbitrarily combined. For example, a solution after removing some steps in a particular embodiment can also be implemented as an independent embodiment, and the order of the steps in a particular embodiment can be arbitrarily interchanged. Furthermore, the optional implementation methods in a particular embodiment can be arbitrarily combined; moreover, the embodiments can be arbitrarily combined, for example, some or all steps of different embodiments can be arbitrarily combined, and a particular embodiment can be arbitrarily combined with the optional implementation methods of other embodiments.

[0112] In each of the disclosed embodiments, unless otherwise specified or in case of logical conflict, the terminology and / or descriptions of the embodiments are consistent and can be referenced by each other. Technical features in different embodiments can be combined to form new embodiments based on their inherent logical relationships.

[0113] The terminology used in the embodiments of this disclosure is for the purpose of describing particular embodiments only and is not intended to limit the scope of this disclosure.

[0114] In this embodiment of the disclosure, unless otherwise stated, elements expressed in the singular form, such as "a," "an," "the," "the," "the," "the," "the," "the," "this," etc., can mean "one and only one," or "one or more," "at least one," etc. For example, when using articles such as "a," "an," "the," etc. in translation, the noun following the article can be understood as either a singular expression or a plural expression.

[0115] In the embodiments disclosed herein, "multiple" refers to two or more.

[0116] In some embodiments, the terms “at least one of”, “one or more”, “a plurality of”, “multiple”, etc., may be used interchangeably.

[0117] In some embodiments, the notation "at least one of A and B", "A and / or B", "A in one case, B in another", "A in one case, B in another", etc., may include the following technical solutions depending on the situation: in some embodiments, A (A is executed regardless of B); in some embodiments, B (B is executed regardless of A); in some embodiments, execution is selected from A and B (A and B are selectively executed); in some embodiments, A and B (both A and B are executed). The same applies when there are more branches such as A, B, C, etc.

[0118] In some embodiments, the notation "A or B" may include the following technical solutions, depending on the situation: in some embodiments, A (execution of A regardless of B); in some embodiments, B (execution of B regardless of A); in some embodiments, execution is selected from A and B (A and B are selectively executed). The same applies when there are more branches such as A, B, C, etc.

[0119] The prefixes "first," "second," etc., used in the embodiments of this disclosure are merely for distinguishing different descriptive objects and do not impose restrictions on the position, order, priority, value, or content of the descriptive objects. The description of the descriptive objects should be found in the claims or the context of the embodiments, and the use of prefixes should not constitute unnecessary restrictions. For example, if the descriptive object is a "field," the ordinal numbers preceding "field" in "first field" and "second field" do not restrict the position or order of the "fields." "First" and "second" do not restrict whether the "fields" they modify are in the same message, nor do they restrict the order of "first field" and "second field." Similarly, if the descriptive object is a "level," the ordinal numbers preceding "level" in "first level" and "second level" do not restrict the priority between "levels." Furthermore, the value of the descriptive object is not limited by ordinal numbers and can be one or more. For example, in "first device," the value of "device" can be one or more. Furthermore, the objects modified by different prefixes can be the same or different. For example, if the object being described is "device", then "first device" and "second device" can be the same device or different devices, and their types can be the same or different. Similarly, if the object being described is "information", then "first information" and "second information" can be the same information or different information, and their content can be the same or different.

[0120] In some embodiments, “including A,” “containing A,” “for indicating A,” and “carrying A” can be interpreted as directly carrying A or indirectly indicating A.

[0121] In some embodiments, terms such as “…”, “determine…”, “in the case of…”, “when…”, “when…”, “if…”, etc. can be used interchangeably.

[0122] In some embodiments, the terms “greater than”, “greater than or equal to”, “not less than”, “more than”, “more than or equal to”, “not less than”, “higher than”, “higher than or equal to”, “not lower than”, and “above” can be used interchangeably, as can the terms “less than”, “less than or equal to”, “not greater than”, “less than”, “less than or equal to”, “not more than”, “lower than”, “lower than or equal to”, “not higher than”, and “below”.

[0123] In some embodiments, devices, etc., can be interpreted as physical or virtual, and their names are not limited to the names recorded in the embodiments. Terms such as “device”, “equipment”, “circuit”, “network element”, “node”, “function”, “unit”, “section”, “system”, “network”, “chip”, “chip system”, “entity”, and “subject” can be used interchangeably.

[0124] Furthermore, each element, each row, or each column in the table of this disclosure can be implemented as an independent embodiment, and any combination of any element, any row, or any column can also be implemented as an independent embodiment.

[0125] The switching of the four MOSFETs in an inverter H-bridge generates high-frequency switching losses and high-frequency electromagnetic radiation. Especially during the low-voltage and low-current phases of each AC sinusoidal cycle, the input voltage is first boosted to a high voltage and then converted back to a low voltage, resulting in significant energy waste.

[0126] An inverter H-bridge consists of two arms, left and right. Each arm is composed of upper and lower MOSFETs. The lower MOSFET controls the negative terminal of the high voltage, and the upper MOSFET controls the positive terminal. This means that the upper and lower MOSFETs are not at the same potential. Especially when driving the upper MOSFET, a voltage pump is needed to boost the driving voltage to exceed the DC bus voltage, which increases the driving cost. In addition, the upper and lower MOSFETs are connected to the positive and negative terminals of the DC high voltage respectively, which poses a risk of shoot-through short circuit. Furthermore, the high-voltage side H-bridge controls at least one pair of MOSFETs on the left and right sides to operate simultaneously, making the control complex.

[0127] Figure 1 This is a voltage conversion circuit 100 shown according to an embodiment of the present disclosure. For example... Figure 1 As shown, the voltage conversion circuit 100 includes:

[0128] The detection module 110 is used to detect circuit parameters, wherein the circuit parameters include at least one of the following: the first half-cycle and the second half-cycle of the alternating current, wherein the first half-cycle is different from the second half-cycle;

[0129] The control module 120 is used to control at least one of the first isolation transformer module 130, the first isolation switch module 140, the second isolation transformer module 160, and the second isolation switch module 170 according to the circuit parameters.

[0130] The first isolation transformer module 130 is used to output a first voltage signal in the first half-cycle based on the first control signal of the control module 120 and the input DC voltage signal.

[0131] The first isolating switch module 140 is used to, based on the control of the control module 120, conduct the first connection between the first isolating transformer module 130 and the first filter module 150 in the first half-cycle, and disconnect the first connection in the second half-cycle.

[0132] The first filtering module 150 is used to input a first voltage signal through the first connection during the first half-cycle, filter the first voltage signal to obtain a first AC voltage signal, and output the first AC voltage signal to the AC power grid.

[0133] The second isolation transformer module 160 is used to output a second voltage signal in the second half-cycle based on the second control signal of the control module 120 and the input DC voltage signal.

[0134] The second isolating switch module 170 is used to, based on the control of the control module 120, conduct the second connection between the second isolating transformer module 160 and the second filter module 180 in the second half-cycle, and to disconnect the second connection in the first half-cycle.

[0135] The second filtering module 180 is used to input a second voltage signal through the second connection during the second half-cycle, filter the second voltage signal to obtain a second AC voltage signal, and output the second AC voltage signal to the AC power grid.

[0136] Here, the voltage conversion circuit 100 can be used for grid-connected photovoltaic power generation. The voltage conversion circuit 100 can convert the DC voltage signal generated by photovoltaic power generation into the AC voltage signal of the AC power grid. Here, the AC power can be industrial frequency AC power, which can include 220V / 50Hz AC power, but is not limited to this.

[0137] In one possible implementation, the first half-cycle can be the positive half-cycle of the alternating current, and the second half-cycle can be the negative half-cycle of the alternating current.

[0138] In one possible implementation, the first half-cycle can be the negative half-cycle of the alternating current (AC), and the second half-cycle can be the positive half-cycle of the AC. The detection module 110 can be used to detect the zero-crossing point of the AC. For example, the detection module 110 may include a rectifier diode and a current-limiting resistor connected in series with the rectifier diode, and the zero-crossing point of the AC is determined by the current flowing through the current-limiting resistor. The detection module 110 determines whether the AC is in the positive or negative half-cycle by half-wave rectification of the AC, i.e., determines the first half-cycle and / or the second half-cycle.

[0139] In one possible implementation, the detection module 110 detects the first half-cycle and the second half-cycle by including at least one of the following:

[0140] The detection module 110 detects the start and end positions of the first half-cycle;

[0141] The detection module 110 detects the start and end positions of the second half-cycle.

[0142] In one possible implementation, the control module 120 can determine the second half-cycle based on the determined first half-cycle. For example, the end position and start position of the second half-cycle can be determined based on the start and end positions of the first half-cycle, respectively.

[0143] In one possible implementation, the control module 120 can determine the first half-cycle based on the determined second half-cycle. For example, the end position and start position of the first half-cycle can be determined based on the start and end positions of the second half-cycle, respectively.

[0144] In one possible implementation, different circuit parameters can be indicated by different electrical signals. For example, the control module 120 can indicate the start position of the first half-cycle by a rising edge, the end position of the first half-cycle by a falling edge, and the start position of the second half-cycle, and so on.

[0145] In one possible implementation, the detection module 110 is connected to the control module 120, and the detection module 110 sends circuit parameters to the control module 120 through the connection with the control module 120.

[0146] The control module 120 can enable at least one of the first isolation transformer module 130, the first disconnect switch module 140, the second isolation transformer module 160, and the second disconnect switch module 170 based on a first half-cycle and / or a second half-cycle. For example, the control module 120 can send a first control signal to enable the first isolation transformer module 130 and control the first disconnect switch module 140 to output a first voltage signal in the first half-cycle, and send a second control signal to enable the second isolation transformer module 160 and control the second disconnect switch module 170 to output a second voltage signal in the second half-cycle.

[0147] In one possible implementation, the first voltage signal can be a DC voltage signal, and the second voltage signal can be a DC voltage signal.

[0148] In one possible implementation, the first AC voltage signal can be a voltage signal within an AC half-cycle, the first AC voltage signal can be a DC voltage signal, and the second voltage signal can be a DC voltage signal.

[0149] In one possible implementation, the first control signal can be an enable signal used to switch the output of the first isolation transformer module 130.

[0150] In one possible implementation, the first control signal may be used to adjust the output voltage value of the first isolation transformer module 130. In another possible implementation, the second control signal may be an enable signal used to switch the output of the second isolation transformer module 160 on or off.

[0151] In one possible implementation, the second control signal can be used to adjust the output voltage value of the second isolation transformer module 160.

[0152] In one possible implementation, the control module 120 may include a controller and peripheral circuitry. The control module 120 can provide control logic signals, and the peripheral circuitry can provide level adaptation. For example, the control module 120 can provide control logic signals for a switching transistor, and the peripheral circuitry can perform level conversion (such as boost conversion) on the logic signals to control the switching transistor.

[0153] The isolation transformer modules (first isolation transformer module 130 and second isolation transformer module 160) can isolate the DC voltage signal and the voltage signal (first voltage signal and second voltage signal) through isolation circuits, such as transformers. The isolation transformer modules can regulate the voltage through transformers, for example, by boosting or bucking the DC voltage signal to obtain the voltage signal (first voltage signal and second voltage signal).

[0154] In one possible implementation, the isolation transformer module may include a chopper circuit to chop the DC voltage signal, and then pass it through a transformer for isolation and rectification to obtain a voltage signal (a first voltage signal and a second voltage signal).

[0155] The voltage value of the first voltage signal can meet the requirements of the first AC voltage signal in the first half-cycle of AC power, and the voltage value of the second voltage signal can meet the requirements of the second AC voltage signal in the second half-cycle of AC power. For example, the DC voltage signal can be chopped using an SPWM signal to obtain the first voltage signal or the second voltage signal. The first voltage signal or the second voltage signal is then filtered by the first filter module 150 and the second filter module 180, respectively, to obtain the first AC voltage signal and the second AC voltage signal that meet the requirements of AC power.

[0156] In one possible implementation, the voltage polarities of the first AC voltage signal and the second AC voltage signal are opposite.

[0157] The first isolation transformer module 130 and the second isolation transformer module 160 are each responsible for half a cycle of AC voltage output. Compared to an isolation transformer module that is responsible for the entire cycle of AC voltage output, the output voltage difference between the first isolation transformer module 130 and the second isolation transformer module 160 is smaller, which reduces the risk of voltage breakdown caused by a large output voltage difference.

[0158] The first isolating switch module 140 can be used to switch the first AC voltage input to the first filter module 150; the second isolating switch module 170 can be used to switch the second AC voltage input to the second filter module 180. In the first half-cycle, the first isolating switch module 140 conducts the first connection, allowing the first voltage signal to be input to the first filter module 150 for filtering to obtain a first AC voltage signal input to the AC power grid; simultaneously, the second isolating switch module 170 disconnects the second connection, reducing the possibility of AC power grid signals flowing back into the second isolation transformer module 160, thus reducing the risk of the second isolation transformer module 160 being damaged by AC power grid signals. In the second half-cycle, the second isolating switch module 170 conducts the second connection, allowing the second voltage signal to be input to the second filter module 180 for filtering to obtain a second AC voltage signal input to the AC power grid; simultaneously, the first isolating switch module 140 disconnects the first connection, reducing the possibility of AC power grid signals flowing back into the first isolation transformer module 130, thus reducing the risk of the first isolation transformer module 130 being damaged by AC power grid signals.

[0159] Thus, the first isolation transformer module 130 and the second isolation transformer module 160 are used to output the voltage for half a cycle of AC power, respectively, and the first isolation switch module 140 and the second isolation switch module 170 are used to switch the first voltage signal and the second voltage signal, respectively. The voltage conversion circuit 100 provided in this embodiment is controlled by the control module 120 and the detection module 110 to detect the first half cycle and the second half cycle of AC power. The first isolation transformer module 130 outputs the first voltage signal in the first half cycle based on the first control signal of the control module 120; the first isolation switch module 140, based on the control of the control module 120, conducts the first connection between the first isolation transformer module 130 and the first filter module 150 in the first half cycle and disconnects the first connection in the second half cycle; the second isolation transformer module 160 outputs the second voltage signal in the second half cycle based on the second control signal of the control module 120; the second isolation switch module 170, based on the control of the control module 120, conducts the second connection between the second isolation transformer module 160 and the second filter module 180 in the second half cycle; the filter module is used to filter the voltage signal to obtain the AC voltage signal. On the one hand, the voltage conversion circuit 100 can synchronize voltage conversion with the AC grid based on the monitoring of the AC power cycle by the detection module 110, thus meeting the requirements of grid-connected power generation. On the other hand, the first isolation transformer module 130 and the second isolation transformer module 160 only need to transform half of the AC voltage amplitude, which can improve transformation efficiency and reduce energy waste. Furthermore, the isolation transformer module isolates the AC grid when it is not outputting, reducing the probability of damage to the isolation transformer module from AC backflow and improving circuit safety.

[0160] In one embodiment, such as Figure 2 As shown, the first isolation transformer module 130 includes: a first full-bridge circuit 131, a first transformer 132, and a first full-wave rectifier circuit 133;

[0161] The first full-bridge circuit 131 is used to convert the DC voltage signal into a first square wave voltage signal in the first half-cycle based on the first sinusoidal pulse width modulation signal of the control module 120, and input the first square wave voltage signal to the first primary winding of the first transformer 132. The first control signal includes the first sinusoidal pulse width modulation signal.

[0162] The first full-wave rectifier circuit 133 is used to perform full-wave rectification on the first induced voltage signal output by the first secondary winding of the first transformer 132 inducing the first square wave voltage, so as to obtain the first voltage signal.

[0163] like Figure 3As shown, the second isolation transformer module 160 includes: a second full-bridge circuit 161, a second transformer 162, and a second full-wave rectifier circuit 163;

[0164] The second full-bridge circuit 161 is used to convert the DC voltage signal into a second square wave voltage signal in the second half-cycle based on the second sinusoidal pulse width modulation signal of the control module 120, and input the second square wave voltage signal to the second primary winding of the second transformer 162; the first control signal includes the second sinusoidal pulse width modulation signal;

[0165] The second full-wave rectifier circuit 163 is used to perform full-wave rectification on the second induced voltage signal output by the second secondary winding of the second transformer 162, which is induced by the second square wave voltage, to obtain the second voltage signal.

[0166] Specifically, such as Figure 4 As shown, the first full-bridge circuit 131 may include an H-bridge composed of four switching transistors Q1, Q2, Q3, and Q4. Q1 and Q4 form one current path, and Q3 and Q2 form another. The first transformer 132 may include a transformer T1. The first full-wave rectifier circuit 133 includes four rectifier diodes D1, D2, D3, and D4, where D1 and D3 form one current path, and D2 and D4 form another.

[0167] In the first half-cycle, control module 120 controls Q1, Q2, Q3, and Q4 to input a first square wave voltage signal to the first primary winding of the first transformer 132 via a first sinusoidal pulse width modulation signal. This first square wave voltage signal can generate a current in one or two directions in the first primary winding of the first transformer 132, thereby inducing a first induced voltage signal in the first secondary winding of the first transformer 132. The induced current in the first secondary winding of the first transformer 132 can be in one direction or in two directions. The first sinusoidal pulse width modulation signals applied by control module 120 to Q1, Q2, Q3, and Q4 are different.

[0168] The first full-wave rectifier circuit 133 rectifies the induced current in the first secondary winding of the first transformer 132. For example... Figure 4 As shown, a positive first voltage signal is generated at the N terminal of D1 and D4.

[0169] In the first half-cycle, the first disconnecting switch module 140 conducts the first connection, and the first filtering module 150 filters the first voltage signal to obtain the first AC voltage signal.

[0170] The second full-bridge circuit 161 may include an H-bridge composed of four switching transistors Q5, Q6, Q7, and Q8. Q5 and Q8 form one current path, and Q7 and Q6 form another. The second transformer 162 may include transformer T2. The second full-wave rectifier circuit 163 includes four rectifier diodes D5, D6, D7, and D8, where D5 and D7 form one current path, and D6 and D8 form another.

[0171] In the second half-cycle, control module 120 controls Q5, Q6, Q7, and Q8 to input a second square wave voltage signal into the first primary winding of the second transformer 162 via a second sinusoidal pulse width modulation signal. This second square wave voltage signal can generate a current in one or two directions in the first primary winding of the second transformer 162, thereby inducing a second induced voltage signal in the first secondary winding of the second transformer 162. The induced current in the first secondary winding of the second transformer 162 can be in one direction or in two directions. The first sinusoidal pulse width modulation signals applied by control module 120 to Q5, Q6, Q7, and Q8 are different.

[0172] The second full-wave rectifier circuit 163 rectifies the induced current in the first secondary winding of the second transformer 162. For example... Figure 4 As shown, a positive second voltage signal is generated at the N terminal of D5 and D7.

[0173] In the second half-cycle, the second disconnecting switch module 170 connects the second connection, and the second filtering module 180 filters the two voltage signals to obtain the second AC voltage signal.

[0174] In one possible implementation, the first transformer 132 and the second transformer 162 can be used for either step-up or step-down.

[0175] In one possible implementation, during the first half-cycle, the control module 120 can shut down the second full-bridge circuit 161Q5, Q6, Q7 and Q8, so that no induced electromotive force is generated on the second transformer 162, that is, during the first half-cycle, the second isolation transformer module 160 does not generate the second voltage signal.

[0176] In one possible implementation, during the second half-cycle, the control module 120 can shut down the first full-bridge circuit 131Q1, Q2, Q3 and Q4, so that no induced electromotive force is generated on the first transformer 132, that is, during the first half-cycle, the first isolation transformer module 130 does not generate the first voltage signal.

[0177] In this way, by generating a square wave voltage signal through a full-bridge circuit and rectifying it through a full-bridge circuit, the conversion efficiency of converting the DC voltage signal into a voltage signal (the first voltage signal and the second voltage signal) can be improved, reducing energy waste.

[0178] In some embodiments, the first transformer 132 and the second transformer 162 are the same transformer, the first primary winding and the second primary winding are the same primary winding, and the first full-bridge circuit 131 and the second full-bridge circuit 161 are the same full-bridge circuit; the first transformer 132 includes a first secondary winding and a second secondary winding.

[0179] The first full-bridge circuit 131 is configured to convert the DC voltage signal into a first square wave voltage signal in the first half-cycle based on the first sinusoidal pulse width modulation signal, and input the first square wave voltage signal into the first primary winding; and to convert the DC voltage signal into a second square wave voltage signal in the second half-cycle based on the second sinusoidal pulse width modulation signal, and input the second square wave voltage signal into the first primary winding.

[0180] The first full-wave rectifier circuit 133 is used to perform full-wave rectification on the first induced voltage signal output by the first secondary winding induced by the first square wave voltage to obtain the first voltage signal.

[0181] The second full-wave rectifier circuit 163 is used to perform full-wave rectification on the second induced voltage signal output by the second secondary winding inducing the second square wave voltage, so as to obtain the second voltage signal.

[0182] Specifically, the first full-bridge circuit 131 and the second full-bridge circuit 161 can operate only in the first half-cycle and the second half-cycle, respectively. Therefore, only one full-bridge circuit needs to operate in the first and second half-cycles. The first transformer 132 can have two secondary windings, which are used to output the first voltage signal and the second voltage signal in the first and second half-cycles, respectively. The first connection and the second connection are connected through the first disconnect switch module 140 and the second disconnect switch module 170.

[0183] like Figure 5 As shown, the first full-bridge circuit 131 may include an H-bridge composed of four switching transistors Q1, Q2, Q3, and Q4. Q1 and Q4 form one current path, and Q3 and Q2 form another. The first transformer 132 may include a transformer T1. The first transformer 132 includes a first secondary winding T1-A and a second secondary winding T1-B. The first full-wave rectifier circuit 133 includes four rectifier diodes D1, D2, D3, and D4, where D1 and D3 form one current path, and D2 and D4 form another. The second full-wave rectifier circuit 163 includes four rectifier diodes (D5, D6, D7, and D8), where D5 and D7 form one current path, and D6 and D8 form another.

[0184] In the first half-cycle, control module 120 controls Q1, Q2, Q3, and Q4 to input a first square wave voltage signal to the first primary winding of the first transformer 132 via a first sinusoidal pulse width modulation signal. This first square wave voltage signal can generate a current in one or two directions in the first primary winding of the first transformer 132, thereby inducing a first induced voltage signal in the first secondary winding T1-A of the first transformer 132. The induced current in the first secondary winding T1-A of the first transformer 132 can be in one direction or in two directions. The first sinusoidal pulse width modulation signals applied by control module 120 to Q1, Q2, Q3, and Q4 are different. First full-wave rectifier circuit 133 rectifies the induced current in the first secondary winding T1-A of the first transformer 132, generating a positive first voltage signal at the N-terminus of D1 and D4. First disconnecting switch module 140 connects the first connection, and first filter module 150 filters the first voltage signal to obtain a first AC voltage signal.

[0185] In the second half-cycle, control module 120 controls Q1, Q2, Q3, and Q4 to input a second square wave voltage signal to the first primary winding of the first transformer 132 via a second sinusoidal pulse width modulation signal. This second square wave voltage signal can generate a current in one or two directions in the first primary winding of the first transformer 132, thereby inducing a second induced voltage signal in the second secondary winding T1-B of the first transformer 132. The induced current in the second secondary winding T1-B of the first transformer 132 can be in one direction or two directions. The second sinusoidal pulse width modulation signals applied by control module 120 to Q1, Q2, Q3, and Q4 are different. Second full-wave rectifier circuit 163 rectifies the induced current in the second secondary winding T1-B of the first transformer 132, generating a positive second voltage signal at the N pole of D5 and D7. Second isolating switch module 170 connects the second connection, and second filter module 180 filters the second voltage signal to obtain a second AC voltage signal.

[0186] This reduces the number of full-bridge circuits and transformers, lowers circuit complexity, and reduces costs.

[0187] In some embodiments, such as Figure 6As shown, the first isolation transformer module 130 includes a first flyback isolation circuit composed of a first switching transistor 134, a third transformer 135, and a first rectifier diode 136. The first switching transistor 134 is connected to the first end of the third primary winding of the third transformer 135, and the second end of the third primary winding receives the DC voltage signal. The first rectifier diode 136 is connected to the third secondary winding of the third transformer 135. The first flyback isolation circuit converts the DC voltage signal into the first voltage signal during the first half-cycle based on the third sinusoidal pulse width modulation signal input by the control module 120 to the first switching transistor 134.

[0188] like Figure 7 As shown, the second isolation transformer module 160 includes a second flyback isolation circuit composed of a second switching transistor 164, a fourth transformer 165, and a second rectifier diode 166. The second switching transistor 164 is connected to the first end of the fourth primary winding of the fourth transformer 165, and the second end of the fourth primary winding is input with the DC voltage signal. The second rectifier diode 166 is connected to the fourth secondary winding of the fourth transformer 165. The second flyback isolation circuit converts the DC voltage signal into the second voltage signal in the second half-cycle based on the fourth sinusoidal pulse width modulation signal input to the second switching transistor 164 by the control module 120.

[0189] The first control signal includes the third sinusoidal pulse width modulation signal and the fourth sinusoidal pulse width modulation signal.

[0190] Here, the first switching transistor 134 and the first rectifier diode 136 can be connected to the opposite-name terminal of the third transformer 135. The first switching transistor 134 switches the current flowing out of the third primary winding of the third transformer 135 according to the third sinusoidal pulse width modulation signal, thereby generating an induced electromotive force in the third secondary winding of the third transformer 135, which is rectified by the first rectifier diode 136 to obtain the first voltage signal.

[0191] Specifically, such as Figure 8 As shown, the first switching transistor 134Q1 and the first rectifier diode 136D1 can be connected to the opposite-name terminal of the third transformer 135T1. In the first half-cycle, Q1 switches the current flowing out of the third primary winding of T1 according to the third sinusoidal pulse width modulation signal, thereby generating an induced electromotive force in the third secondary winding of T1, which is rectified by the first rectifier diode 136D1 to obtain the first voltage signal.

[0192] In the first half-cycle, the first disconnecting switch module 140 conducts the first connection, and the first filtering module 150 filters the first voltage signal to obtain the first AC voltage signal.

[0193] Here, the second switching transistor 164 and the second rectifier diode 166 can be connected to the opposite-name terminal of the fourth transformer 165. The second switching transistor 164 switches the current flowing out of the fourth primary winding of the fourth transformer 165 according to the fourth sinusoidal pulse width modulation signal, thereby generating an induced electromotive force in the fourth secondary winding of the fourth transformer 165, which is rectified by the second rectifier diode 166 to obtain the second voltage signal.

[0194] Specifically, such as Figure 8 As shown, the second switching transistor 164Q5 and the second rectifier diode 166D5 can be connected to the opposite terminals of the fourth transformer 165T2. During the second half-cycle, Q5 switches the current flowing out of the fourth primary winding of T2 according to the fourth sinusoidal pulse width modulation signal, thereby generating an induced electromotive force in the fourth secondary winding of T2. This induced electromotive force is then rectified by D5 to obtain the second voltage signal.

[0195] In the second half-cycle, the second disconnecting switch module 170 connects the second connection, and the second filtering module 180 filters the second voltage signal to obtain the second AC voltage signal.

[0196] Flyback circuits have high conversion efficiency when the input voltage (i.e., DC voltage signal) is low, which can reduce energy waste.

[0197] In some embodiments, such as Figure 9 As shown, the first disconnecting switch module 140 includes: a third flyback isolation circuit composed of a third switch 141, a fifth transformer 142, and a third rectifier diode 143, and a fourth switch 144. The third switch 141 is connected to the first end of the fifth primary winding of the fifth transformer 142, and the second end of the fifth primary winding is input with the DC voltage signal. The third rectifier diode 143 is connected to the fifth secondary winding of the fifth transformer 142. The third flyback isolation circuit outputs a first disconnecting switch signal to the fourth switch 144 based on the first switching signal input to the third switch 141 by the control module 120, so as to turn on or off the first connection.

[0198] like Figure 10As shown, the second disconnecting switch module 170 includes: a fourth flyback isolation circuit composed of a fifth switch 171, a sixth transformer 172, and a fourth rectifier diode 173, and a sixth switch 174. The fifth switch 171 is connected to the first end of the sixth primary winding of the sixth transformer 172, and the second end of the sixth primary winding is input with the DC voltage signal. The fourth rectifier diode 173 is connected to the sixth secondary winding of the sixth transformer 172. The fourth flyback isolation circuit outputs a second disconnecting switch signal to the sixth switch 174 based on the second switching signal input to the fifth switch 171 by the control module 120, so as to turn on or off the second connection.

[0199] Specifically, such as Figure 4 As shown, the third switch transistor 141Q12 and the third rectifier diode 143D9 can be connected to the fifth primary winding and the fifth secondary winding of the fifth transformer 142T3, respectively. Q12 switches the current flowing out of the fifth primary winding of T3 according to the first switch signal, thereby generating an induced electromotive force in the fifth secondary winding of T3, which in turn generates a first isolating switch signal. This first isolating switch signal is used to control the conduction or closure of the fourth switch transistor 144Q9, thereby connecting or disconnecting the first connection. Because the first switch signal and the first isolating switch signal are isolated by the fifth transformer 142T3, the possibility of AC backflow from the AC power grid damaging the control module 120 is reduced. In the first half-cycle, the first isolating switch signal is used to control the fourth switch transistor 144Q9 to conduct, i.e., to connect the first connection. In the second half-cycle, the first isolating switch signal is used to control the fourth switch transistor 144Q9 to close, i.e., to disconnect the first connection.

[0200] The fifth switch transistor 171Q11 and the fourth rectifier diode 173D10 can be connected to the sixth primary winding and the sixth secondary winding of the sixth transformer 172T4, respectively. Q11 switches the current flowing out of the fifth primary winding of T4 according to the second switch signal, thereby generating an induced electromotive force in the sixth secondary winding of T4, which in turn generates a second isolating switch signal. This second isolating switch signal is used to control the conduction or closure of the sixth switch transistor 174Q10, thereby connecting or disconnecting the second connection. Since the second switch signal and the second isolating switch signal are isolated by the sixth transformer 172T4, the possibility of AC backflow from the AC power grid damaging the control module 120 is reduced. In the second half-cycle, the second isolating switch signal is used to control the conduction of the sixth switch transistor 174Q10, i.e., to connect the second connection. In the second half-cycle, the second isolating switch signal is used to control the closure of the sixth switch transistor 174Q10, i.e., to disconnect the first connection.

[0201] like Figure 4As shown, the negative output terminal of the first isolation transformer module 130 is connected to the positive output terminal of the second isolation transformer module 160 via the first isolation switch module 140 (controlled by the second isolation switch module). The output is then fed to the first terminal of the AC power grid via a filter module. The positive output terminal of the first isolation transformer module 130 is connected to the AC power grid, and the negative output terminal of the second isolation transformer module is connected to the second terminal of the AC power grid. This achieves power supply to the AC power grid.

[0202] In some embodiments, the voltage conversion circuit 100 further includes: a first voltage regulator module, used to regulate the DC voltage signal input to the second terminal of the fifth primary winding and the second terminal of the sixth primary winding.

[0203] In one possible implementation, the first voltage regulator module may include: a first resistor connected in series with the first input terminal of the DC voltage signal of the fifth primary winding, a Zener diode connected in parallel with the first input terminal, and a first capacitor connected in parallel with the first input terminal. The first resistor is used to limit the current flowing into the Zener diode.

[0204] In one possible implementation, the first voltage regulator module may include: a second resistor connected in series with the second input terminal of the DC voltage signal of the sixth primary winding, a Zener diode connected in parallel with the second input terminal, and a second capacitor connected in parallel with the second input terminal. The second resistor is used to limit the current flowing into the Zener diode.

[0205] In one possible implementation, the first input terminal of the DC voltage signal of the fifth primary winding is connected to the second input terminal of the DC voltage signal of the sixth primary winding, and the first input terminal and the second input terminal can share the first voltage regulator module.

[0206] In one possible implementation, the Zener diode can be used as the voltage regulator diode.

[0207] Specifically, such as Figure 4 As shown, the first input terminal of the DC voltage signal of the fifth primary winding T3 of the fifth transformer 142T3 is connected to the second input terminal of the DC voltage signal of the sixth primary winding of the sixth transformer 172T4. The first voltage regulator module may include: a first resistor R3 connected in series with the first input terminal (i.e., connected in series with the second input terminal), a Zener diode ZD3 connected in parallel with the first input terminal (i.e., connected in parallel with the second input terminal), and a first capacitor C5 connected in parallel with the first input terminal (i.e., connected in parallel with the second input terminal).

[0208] The first voltage regulator module can reduce fluctuations in the DC voltage signal and improve the stability of the output first and second isolation switch signals.

[0209] In some embodiments, the voltage conversion circuit 100 further includes at least one of the following: a second voltage regulator module and a third voltage regulator module;

[0210] The second voltage regulator module is connected between the third rectifier diode 143 and the fourth switch 144, and is used to regulate the voltage of the first isolation switch signal;

[0211] The third voltage regulator module is connected between the fourth rectifier diode 173 and the sixth switch transistor 174, and is used to regulate the voltage of the second isolation switch signal.

[0212] Here, the second voltage regulator module is connected in parallel with the first disconnect switch signal input terminal of the fourth switch tube 144 to regulate the voltage of the first disconnect switch signal.

[0213] The third voltage regulator module is connected in parallel to the second disconnect switch signal input terminal of the sixth switch transistor 174 to regulate the voltage of the second disconnect switch signal.

[0214] Specifically, such as Figure 4 As shown, the second voltage regulator module includes: a resistor R1, a capacitor C3, and a Zener diode ZD1 connected in parallel with the first isolation switch signal input terminal of the fourth switch 144. The third voltage regulator module includes: a resistor R2, a capacitor C4, and a Zener diode ZD2 connected in parallel with the third isolation switch signal input terminal of the sixth switch 174.

[0215] In some embodiments, the first filtering module 150 includes a first inductor-capacitor LC filtering circuit;

[0216] The second filtering module 180 includes a second inductor-capacitor LC filter circuit.

[0217] Here, an LC filter circuit can be used to filter the first voltage signal and the second voltage signal respectively.

[0218] In some embodiments, the first inductor of the first inductor-capacitor LC filter circuit and the second inductor of the second inductor-capacitor LC filter circuit are the same inductor.

[0219] Since the first isolation transformer module 130 outputs a first voltage signal in the first half-cycle and the second isolation transformer module 160 outputs a second voltage signal in the second half-cycle, the first voltage signal and the second voltage signal output by the first isolation transformer module 130 and the second isolation transformer module 160 will not exist simultaneously. Therefore, they can share a single inductor for filtering, reducing circuit cost.

[0220] like Figure 4As shown, the negative output terminal of the first isolation transformer module 130 is connected to one end of the inductor L1 via the first isolation switch module 140 and the positive output terminal of the second isolation transformer module 160 (controlled by the second isolation switch module). The other end of L1 is provided with capacitors C2 and C3. L1 and C2 filter the first voltage signal, and L1 and C3 filter the second voltage signal.

[0221] In some embodiments, the circuit parameters further include at least one: the current value corresponding to the first AC voltage signal, and the current value corresponding to the second AC voltage signal;

[0222] Control module 120 is used for at least one of the following:

[0223] Based on the current value corresponding to the first AC voltage signal, the duty cycle of the first control signal is adjusted to adjust the first voltage signal;

[0224] Based on the current value corresponding to the second AC voltage signal, the duty cycle of the second control signal is adjusted to adjust the second voltage signal.

[0225] Depending on the load of the AC power grid, the current values ​​of the first AC voltage signal and the second AC voltage signal will vary, thus affecting the voltage values ​​of both signals.

[0226] The first control signal may include a sinusoidal pulse width modulation signal. The detection module 110 can detect the current value of the first AC voltage signal by means of a detection resistor connected in series at the output terminal of the first AC voltage signal. The control module 120 can adjust the first AC voltage signal by adjusting the duty cycle of the sinusoidal pulse width modulation signal.

[0227] The second control signal may include a sinusoidal pulse width modulation signal. The detection module 110 can detect the current value of the second AC voltage signal by means of a detection resistor connected in series at the output terminal of the second AC voltage signal. The control module 120 can adjust the second AC voltage signal by adjusting the duty cycle of the sinusoidal pulse width modulation signal.

[0228] By adjusting the duty cycle of the sinusoidal pulse width modulation signal, the output energy of the first isolation transformer module 130 and the second isolation transformer module 160 can be adjusted to meet different load requirements.

[0229] Figure 11 This is a photovoltaic junction box shown according to an embodiment of the present disclosure. For example... Figure 11 As shown, the voltage conversion circuit 100 includes:

[0230] Figures 1 to 10 The voltage conversion circuit 100 disclosed in any embodiment. The voltage conversion circuit 100 is as follows: Figures 1 to 10As shown in any embodiment, it will not be described again here.

[0231] Figure 12 This is a photovoltaic module shown according to an embodiment of the present disclosure, such as... Figure 12 As shown, photovoltaic modules include: photovoltaic cell arrays and Figures 1 to 10 The voltage conversion circuit 100 disclosed in any embodiment. The battery pack is used to supply power to the voltage conversion circuit 100, which is as follows: Figures 1 to 10 As shown in any embodiment, it will not be described again here.

[0232] Figure 13 This is a photovoltaic module shown according to an embodiment of the present disclosure, such as... Figure 13 As shown, photovoltaic modules include: photovoltaic cell arrays and Figure 11 A photovoltaic junction box disclosed in any embodiment. The photovoltaic junction box includes: Figures 1 to 10 The voltage conversion circuit 100 disclosed in any embodiment. The battery pack is used to supply power to the voltage conversion circuit 100, which is as follows: Figures 1 to 10 As shown in any embodiment, it will not be described again here.

[0233] Figure 14 This is a voltage conversion circuit control method shown in the embodiments of this disclosure, applied to... Figure 1 and Figure 13 The voltage conversion circuit 100 disclosed in any embodiment, such as Figure 14 As shown, the voltage conversion circuit control method includes:

[0234] Step 1401: Obtain circuit parameters, wherein the circuit parameters include the following: the first half-cycle and the second half-cycle of the alternating current, wherein the first half-cycle is different from the second half-cycle;

[0235] Step 1402: Determine the circuit parameters as the first half-cycle;

[0236] Step 1403: Send a first control signal to control the voltage conversion circuit 100 and the first isolation transformer module 130 to output a first voltage signal according to the input DC voltage signal in the first half-cycle;

[0237] Step 1404: Control the first isolating switch module 140 to connect the first connection between the first isolation transformer module 130 and the first filter module 150, wherein the first filter module 150 is used to input a first voltage signal through the first connection in the first half-cycle, filter the first voltage signal to obtain a first AC voltage signal, and output the first AC voltage signal to the AC power grid.

[0238] Step 1405: Control the second isolating switch module 170 to shut off the second connection between the second isolating transformer module 160 and the second filter module 180, wherein the second filter module 180 is used to input a second voltage signal through the second connection during the second half-cycle, filter the second voltage signal to obtain a second AC voltage signal, and output the second AC voltage signal to the AC power grid.

[0239] In some embodiments, the method of this embodiment may be executed by the control module 120 in the voltage conversion circuit 100.

[0240] In some embodiments, the method of this embodiment may be executed by a controller included in the control module 120 of the voltage conversion circuit 100.

[0241] The implementation method of the detection circuit parameters of the detection module 110 is as follows: Figures 1 to 10 As described in any of the embodiments, it will not be repeated here.

[0242] The control module 120 can first be initialized and begin acquiring circuit parameters.

[0243] Here, determining the first half-cycle may include determining the positive zero-crossing point of the alternating current; determining the second half-cycle may include determining the negative zero-crossing point of the alternating current. Alternatively, determining the first half-cycle may include determining the negative zero-crossing point of the alternating current; determining the second half-cycle may include determining the positive zero-crossing point of the alternating current.

[0244] Once the control module 120 determines that the first half-cycle has begun, it can control the first isolation transformer module 130 to output a first voltage signal via a first control signal. The first isolation transformer module 130 outputs the first voltage signal as follows: Figures 1 to 10 As described in any of the embodiments, it will not be repeated here.

[0245] Once the control module 120 determines that the first half-cycle has begun, it can control the first disconnecting switch module 140 to connect the first connection. The first filtering module 150 then filters the first voltage signal to obtain the first AC voltage signal output to the AC power grid.

[0246] Once the control module 120 determines that the first half-cycle has begun, it can control the second disconnecting switch module 170 to disconnect the second connection, thereby reducing the risk of AC power backflow from the AC grid into the second isolation transformer module 160, which could cause the second isolation transformer module 160 to break down.

[0247] The execution order of steps 1403 to 1405 is not important. For example, steps 1404 and 1405 can be executed first, followed by step 1403; or steps 1405 can be executed first, followed by step 1403, and finally step 1404, but this is not the only option.

[0248] Figure 15 This is a voltage conversion circuit control method shown in the embodiments of this disclosure, applied to... Figure 1 and Figure 13 The voltage conversion circuit 100 disclosed in any embodiment, such as Figure 15 As shown, the voltage conversion circuit control method includes:

[0249] Step 1501: Determine the circuit parameters as the second half-cycle.

[0250] Step 1502: Send a second control signal to control the second isolation transformer module 160 to output a second voltage signal according to the input DC voltage signal in the second half-cycle;

[0251] Step 1503: Control the first isolating switch module 140 to disconnect the first connection;

[0252] Step 1503: Control the second disconnect switch module 170 to connect the second connection.

[0253] In one possible implementation, the voltage conversion circuit 100 further includes a detection module 110, wherein acquiring the circuit parameters includes acquiring the circuit parameters detected by the detection module 110.

[0254] Once the control module 120 determines that the second half-cycle has begun, it can control the second isolation transformer module 160 to output a second voltage signal via a second control signal. The second isolation transformer module 160 outputs the second voltage signal as follows: Figures 1 to 10 As described in any of the embodiments, it will not be repeated here.

[0255] Once the control module 120 determines that the second half-cycle has begun, it can control the second disconnect switch module 170 to connect the second connection. The second filter module 180 then filters the second voltage signal to obtain the second AC voltage signal output to the AC power grid.

[0256] Once the control module 120 determines that the second half-cycle has begun, it can control the first isolating switch module 140 to disconnect the first connection, thereby reducing the risk of AC power backflow from the AC grid into the first isolating transformer module 130, which could cause the first isolating transformer module 130 to break down.

[0257] The execution of steps 1502 to 1504 is not in any particular order. For example, steps 1503 and 1504 can be executed first, followed by step 1502; or steps 1504 can be executed first, followed by step 1503, and finally step 1502, but this is not the only option.

[0258] In one possible implementation, the control module 120 can be configured with a timing set by a first half-cycle duration and / or a second half-cycle duration. The control module 120 can also set a first control signal and / or a second control signal based on the first half-cycle duration and / or the second half-cycle duration. For example, the first and second control signals may include a sinusoidal pulse width modulation (PWM) signal. The control module 120 can set the duty cycle of the PWM signal based on the first half-cycle duration and / or the second half-cycle duration to adjust the outputs of the first isolation transformer module 130 and the second isolation transformer module 160.

[0259] Figure 16 This is a voltage conversion circuit control method shown in the embodiments of this disclosure, applied to... Figure 1 and Figure 13 The voltage conversion circuit 100 disclosed in any embodiment, such as Figure 16 As shown,

[0260] The circuit parameters also include at least one: the current value corresponding to the first AC voltage signal, and the current value corresponding to the second AC voltage signal;

[0261] The voltage conversion circuit control method includes at least one of the following:

[0262] Step 1601: Based on the current value corresponding to the first AC voltage signal, adjust the duty cycle of the first control signal to adjust the first voltage signal;

[0263] Step 1602: Based on the current value corresponding to the second AC voltage signal, adjust the duty cycle of the second control signal to adjust the second voltage signal.

[0264] The implementation method of the detection circuit parameters of the detection module 110 is as follows: Figures 1 to 10 As described in any of the embodiments, it will not be repeated here.

[0265] Depending on the load of the AC power grid, the current values ​​of the first AC voltage signal and the second AC voltage signal will vary, thus affecting the voltage values ​​of both signals.

[0266] The first control signal may include a sinusoidal pulse width modulation signal. The detection module 110 can detect the current value of the first AC voltage signal by means of a detection resistor connected in series at the output terminal of the first AC voltage signal. The control module 120 can adjust the first AC voltage signal by adjusting the duty cycle of the sinusoidal pulse width modulation signal.

[0267] The second control signal may include a sinusoidal pulse width modulation signal. The detection module 110 can detect the current value of the second AC voltage signal by means of a detection resistor connected in series at the output terminal of the second AC voltage signal. The control module 120 can adjust the second AC voltage signal by adjusting the duty cycle of the sinusoidal pulse width modulation signal.

[0268] By adjusting the duty cycle of the sinusoidal pulse width modulation signal, the output energy of the first isolation transformer module 130 and the second isolation transformer module 160 can be adjusted to meet different load requirements.

[0269] The following provides several specific examples in conjunction with any of the above embodiments:

[0270] like Figure 17 As shown, this embodiment provides a flexible grid-connected inverter. During the positive half-cycle of the grid, the positive half-cycle enable module is turned on, and the boost / buck circuit module 1 is controlled to output a 50Hz sine wave positive half-cycle. During the negative half-cycle of the grid, the negative half-cycle enable module is turned on, and the boost / buck circuit module 2 is controlled to output a 50Hz sine wave negative half-cycle. At the filter inductor position, i.e., the LC filter module synthesizes a complete sine wave and then sends it to the grid. After the MCU synchronously crosses zero, it sets the constant current value of the 50Hz sine wave at each moment, and outputs and feeds back the constant current value of the sine wave at each moment on the secondary side of the high-frequency transformer.

[0271] like Figure 18 As shown, this embodiment provides a flexible grid-connected inverter, comprising a buck-boost module 1 (i.e., the first isolation transformer module), a sine wave positive half-cycle enable module (i.e., the first isolating switch module), an LC filter module (i.e., the first filter module and the second filter module), an MCU module (i.e., the control module), a current and zero-crossing detection module (i.e., the detection module), a buck-boost module 2 (i.e., the second isolation transformer module), and a sine wave negative half-cycle enable module (i.e., the second filter module and the second filter module); wherein, the current and zero-crossing detection module is used to feed back the grid zero-crossing signal and the inverter output current to the MCU module; wherein, the buck-boost module 1 is used to convert the grid zero-crossing signal and the inverter output current to the grid zero-crossing signal and the inverter output current. The solar module's power boost output is isolated during the positive half-cycle of a sine wave. The sine wave positive half-cycle enable module is used to control the power output of the buck-boost module 1 to be delivered to the grid during the positive half-cycle of the grid and to prevent grid power from flowing back into the secondary coil of the buck-boost module 1 during the negative half-cycle of the grid. The LC filter module is used to smooth the synthesized sine wave waveform. The buck-boost module 2 is used to isolate the negative half-cycle of the solar module's power boost output during the negative half-cycle of the sine wave. The sine wave negative half-cycle enable module is used to control the power output of the buck-boost module 2 to be delivered to the grid during the negative half-cycle of the grid and to prevent grid power from flowing back into the secondary coil of the buck-boost module 2 during the positive half-cycle of the grid.

[0272] like Figure 19As shown, the flexible inverter program workflow includes: The MCU module first reads the grid zero-crossing signal through the current and zero-crossing detection modules. After confirming normal grid connection by reading the zero-crossing signal cycle, it waits for the positive half-cycle zero-crossing. Upon arrival of the positive half-cycle zero-crossing, the MCU module enables the positive half-cycle enable module and calculates the required sinusoidal current value I+ in real time. It then outputs PWM to control the buck-boost module 1 to output the I+ current (adjusting the PWM duty cycle in real time based on the read current and the current feedback from the zero-crossing detection module). This process of calculating, setting, reading, and adjusting the current and PWM continues until the positive half-cycle of the sinusoidal wave is completed. The MCU module then disables the positive half-cycle enable module and waits for the negative half-cycle zero-crossing. Upon arrival of the negative half-cycle zero-crossing, the MCU module enables the negative half-cycle enable module and calculates the required sinusoidal current value I- in real time. It then outputs PWM to control the buck-boost module 2 to output the I- current (adjusting the PWM duty cycle in real time based on the read current and the current feedback from the zero-crossing detection module). The process of calculating, setting, reading, and adjusting the PWM current continues until the negative half-cycle of the sine wave is completed. The MCU module then disables the negative half-cycle enable module; thus, one cycle of the sine wave output is completed.

[0273] like Figure 4 As shown, this embodiment provides a dual full-bridge flexible inverter circuit, wherein:

[0274] The sine wave positive half-cycle enable module consists of Q9, D9, T3, Q12, R1, C3, ZD1, R3, C5, and ZD3. Q9 is the enable MOS, and D9, T3, and Q12 form a flyback isolation power supply to provide the drive signal to the control electrode of Q9. R1, C3, ZD1, R3, C5, and ZD3 are protection devices for the MOS control electrode (to prevent the MOS drive electrode voltage from exceeding 20V).

[0275] The step-up / step-down module 1 consists of T1, Q1, Q2, Q3, Q4, D1, D2, D3, and D4. T1 is a DC / AC transformer, Q1, Q2, Q3, and Q4 form a full-bridge drive MOSFET to drive T1, and D1, D2, D3, and D4 form a bridge rectifier.

[0276] The LC filter module consists of L1, C2, and C3.

[0277] The sine wave negative half-cycle enable module consists of Q10, D10, T4, Q11, R2, C4, ZD2, R3, C5, and ZD3. Q10 is the enable MOS, and D10, T4, and Q11 form a flyback isolation power supply to provide the drive signal to the control electrode of Q10. R2, C4, ZD2, R3, C5, and ZD3 are protection devices for the MOS control electrode (to prevent the MOS drive electrode voltage from exceeding 20V).

[0278] The step-up / step-down module 2 consists of T2, Q5, Q6, Q7, Q8, D5, D6, D7, and D8. T2 is a DC / AC transformer, Q5, Q6, Q7, and Q8 form a full-bridge drive MOSFET to drive T2, and D5, D6, D7, and D8 form a bridge rectifier.

[0279] like Figure 5 As shown, this embodiment provides a dual-output winding full-bridge flexible inverter circuit, wherein:

[0280] Transformer T1 has two output windings: the T1 coil outputs during the positive half-cycle, and the T1-B coil outputs during the negative half-cycle. The remaining circuitry is the same as the attached... Figure 4 The implementation examples are similar and will not be repeated here.

[0281] like Figure 8 As shown, this embodiment provides a power section of a dual flyback flexible inverter circuit, wherein:

[0282] T1 and T2 use flyback drives; the remaining circuitry is the same as the attached... Figure 4 The embodiments are similar and will not be described again here. The circuits using embodiments of this disclosure are described below.

[0283] The circuit and control method provided in any of the above embodiments are as follows:

[0284] First, a sine wave is directly synthesized using two buck-boost circuits, eliminating the need for H-bridge chopping and polarity switching, thus saving on the hardware cost of the inverter H-bridge and avoiding switching losses and electromagnetic radiation during H-bridge inverter operation.

[0285] Second, a sine wave is directly synthesized using two buck-boost circuits, eliminating the need for high-power LCL sine wave filter components;

[0286] Third, this embodiment uses a single-stage boost, isolation, inverter, and grid connection, requiring only one stage of energy conversion, reducing energy conversion steps and improving conversion efficiency;

[0287] Fourth, this embodiment uses two buck-boost circuits to directly synthesize a sine wave, without the need for H-bridge chopper and polarity switching, and without the need for high-power LCL sine wave filter components;

[0288] Fifth, this embodiment directly reads the current supplied by the inverter to the grid and controls the PWM of the buck-boost circuit, realizing sine wave generation and grid connection in one stage;

[0289] Figure 20 This is a schematic diagram of the structure of the electronic device 9100 provided in this embodiment. The electronic device 9100 can be a network device, a terminal (e.g., a user equipment), a chip, chip system, or processor that supports the network device in implementing any of the above methods, or a chip, chip system, or processor that supports the terminal in implementing any of the above information transmission methods. The electronic device 9100 can be used to implement the voltage conversion circuit control method described in the above method embodiments; please refer to the description in the above method embodiments for details.

[0290] like Figure 20 As shown, the electronic device 9100 includes one or more processors 9101. The processor 9101 can be a general-purpose processor or a dedicated processor, such as a baseband processor or a central processing unit (CPU). The baseband processor can be used to process communication protocols and communication data, while the CPU can be used to control communication devices (e.g., base stations, baseband chips, terminal devices, terminal device chips, DUs or CUs, etc.), execute programs, and process program data. The processor 9101 is used to invoke instructions to cause the electronic device 9100 to execute any of the voltage conversion circuit control methods described above.

[0291] In some embodiments, the electronic device 9100 further includes one or more memories 9102 for storing instructions. Optionally, all or part of the memories 9102 may also be located outside the electronic device 9100.

[0292] In some embodiments, the electronic device 9100 further includes one or more transceivers 9103. When the electronic device 9100 includes one or more transceivers 9103, the steps of sending, receiving and / or acquiring in the above method are performed by the transceivers 9103, and the other steps are performed by the processor 9101.

[0293] In some embodiments, the acquisition steps in the above method can also be executed by the processor 9101, for example, acquiring information from the memory 9102.

[0294] In some embodiments, a transceiver may include a receiver and a transmitter, which may be separate or integrated. Optionally, the terms transceiver, transceiver unit, transceiver, transceiver circuit, etc., may be used interchangeably; the terms transmitter, transmitting unit, transmitter, transmitting circuit, etc., may be used interchangeably; and the terms receiver, receiving unit, receiver, receiving circuit, etc., may be used interchangeably.

[0295] Optionally, the electronic device 9100 further includes one or more interface circuits 9104 connected to the memory 9102. The interface circuits 9104 can be used to receive signals from the memory 9102 or other devices, and can be used to send signals to the memory 9102 or other devices. For example, the interface circuits 9104 can read instructions stored in the memory 9102 and send the instructions to the processor 9101.

[0296] The electronic device 9100 described in the above embodiments may be a network device or a terminal, but the scope of the electronic device 9100 described in this disclosure is not limited thereto, and the structure of the electronic device 9100 may vary. Figure 20 The limitations. Electronic devices can be standalone devices or part of a larger device. For example, the electronic devices can be: (1) standalone integrated circuits (ICs), or chips, or chip systems or subsystems; (2) a collection of one or more ICs, optionally including storage components for storing data or programs; (3) ASICs, such as modems; (4) modules that can be embedded in other devices; (5) receivers, terminal devices, smart terminal devices, cellular phones, wireless devices, handheld devices, mobile units, vehicle-mounted devices, network devices, cloud devices, artificial intelligence devices, etc.; (6) others, etc.

[0297] Those skilled in the art will understand that all or part of the steps of the above method embodiments can be implemented by hardware related to program commands. The aforementioned program can be stored in a storage medium, including various media capable of storing program code such as mobile storage devices, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0298] Alternatively, if the integrated units described above are implemented as software functional modules and sold or used as independent products, they can also be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the embodiments of this application, or the parts that contribute to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several commands to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as mobile storage devices, ROM, RAM, magnetic disks, or optical disks.

[0299] It should be understood that the above embodiments are exemplary and are not intended to encompass all possible implementations included in the claims. Various modifications and changes can be made to the above embodiments without departing from the scope of this disclosure. Similarly, the various technical features of the above embodiments can be arbitrarily combined to form other embodiments of the present invention that may not be explicitly described. Therefore, the above embodiments only illustrate several implementations of the present invention and do not limit the scope of protection of this patent.

Claims

1. A voltage conversion circuit control method, characterized in that, A control module applied in a voltage conversion circuit, the voltage conversion circuit further comprising: a first isolation transformer module, a first isolation switch module, a first filter module, a second isolation transformer module, a second isolation switch module, and a second filter module; the method includes: Obtain circuit parameters, wherein the circuit parameters include one of the following: the first half-cycle and the second half-cycle of the alternating current, wherein the first half-cycle is different from the second half-cycle; The circuit parameters are determined to be the first half-cycle; Sending a first control signal controls the first isolation transformer module of the voltage conversion circuit to output a first voltage signal according to the input DC voltage signal during the first half-cycle; The first isolating switch module is controlled to connect the first isolation transformer module and the first filter module. The first filter module is used to input a first voltage signal through the first connection and filter the first voltage signal to obtain a first AC voltage signal during the first half-cycle, and output the first AC voltage signal to the AC power grid. The control second isolating switch module disconnects the second connection between the second isolating transformer module and the second filtering module. The second filtering module is used to input a second voltage signal through the second connection during the second half-cycle, filter the second voltage signal to obtain a second AC voltage signal, and output the second AC voltage signal to the AC power grid.

2. The method according to claim 1, characterized in that, The method further includes: The circuit parameters are determined to be the second half-cycle. Send a second control signal to control the second isolation transformer module to output a second voltage signal according to the input DC voltage signal during the second half-cycle; Control the first isolating switch module to shut off the first connection; Control the second isolating switch module to connect the second connection.

3. The method according to claim 2, characterized in that, The first isolation transformer module includes: a first full-bridge circuit, a first transformer, and a first full-wave rectifier circuit; The method of sending a first control signal to control the first isolation transformer module of the voltage conversion circuit to output a first voltage signal according to the input DC voltage signal in the first half-cycle includes: sending a first sinusoidal pulse width modulation signal, wherein the first sinusoidal pulse width modulation signal is used by the first full-bridge circuit to convert the DC voltage signal into a first square wave voltage signal in the first half-cycle, and inputting the first square wave voltage signal to the first primary winding of the first transformer, wherein the first control signal includes the first sinusoidal pulse width modulation signal; The first induced voltage signal, which is output by the first secondary winding of the first transformer in response to the first square wave voltage, is rectified by the first full-wave rectifier circuit to obtain the first voltage signal. The second isolation transformer module includes: a second full-bridge circuit, a second transformer, and a second full-wave rectifier circuit; The step of sending a second control signal to control the second isolation transformer module to output a second voltage signal according to the input DC voltage signal in the second half-cycle includes: sending a second sinusoidal pulse width modulation signal, wherein the second sinusoidal pulse width modulation signal is used by the second full-bridge circuit to convert the DC voltage signal into a second square wave voltage signal in the second half-cycle, and inputting the second square wave voltage signal to the second primary winding of the second transformer; the first control signal includes the second sinusoidal pulse width modulation signal; The second induced voltage signal, which is output by the second secondary winding of the second transformer in response to the second square wave voltage, is rectified by the first full-wave rectifier circuit to obtain the second voltage signal.

4. The method according to claim 3, characterized in that, The first transformer and the second transformer are the same transformer; the first primary winding and the second primary winding are the same primary winding; the first full-bridge circuit and the second full-bridge circuit are the same full-bridge circuit; the first transformer includes a first secondary winding and a second secondary winding. Wherein, the first sinusoidal pulse width modulation signal is used by the first full-bridge circuit to convert the DC voltage signal into a first square wave voltage signal in the first half-cycle, and input the first square wave voltage signal into the first primary winding. The first sinusoidal pulse width modulation signal is used by the first full-bridge circuit to convert the DC voltage signal into a second square wave voltage signal in the second half-cycle, and input the second square wave voltage signal into the first primary winding; The first induced voltage signal, which is output by the first square wave voltage induced by the first secondary winding, is rectified by the first full-wave rectifier circuit to obtain the first voltage signal. The second induced voltage signal, which is output by the second square wave voltage induced by the second secondary winding, is rectified by the second full-wave rectifier circuit to obtain the second voltage signal.

5. The method according to claim 2, characterized in that, The first isolation transformer module includes: a first flyback isolation circuit consisting of a first switching transistor, a third transformer, and a first rectifier diode, wherein the first switching transistor is connected to the first end of the third primary winding of the third transformer, the second end of the third primary winding is input with the DC voltage signal, and the first rectifier diode is connected to the third secondary winding of the third transformer. The method of sending a first control signal to control the first isolation transformer module of the voltage conversion circuit to output a first voltage signal according to the input DC voltage signal in the first half-cycle includes: inputting a third sinusoidal pulse width modulation signal to the first switch, wherein the third sinusoidal pulse width modulation signal is used by the first flyback isolation circuit to convert the DC voltage signal into the first voltage signal in the first half-cycle. The second isolation transformer module includes: a second flyback isolation circuit consisting of a second switching transistor, a fourth transformer, and a second rectifier diode, wherein the second switching transistor is connected to the first end of the fourth primary winding of the fourth transformer, the second end of the fourth primary winding is input with the DC voltage signal, and the second rectifier diode is connected to the fourth secondary winding of the fourth transformer. The step of sending a second control signal to control the second isolation transformer module to output a second voltage signal according to the input DC voltage signal in the second half-cycle includes: inputting a fourth sinusoidal pulse width modulation signal to the second switch, and the third sinusoidal pulse width modulation signal is used by the second flyback isolation circuit to convert the DC voltage signal into the second voltage signal in the second half-cycle. The first control signal includes the third sinusoidal pulse width modulation signal and the fourth sinusoidal pulse width modulation signal.

6. The method according to claim 2, characterized in that, The first disconnecting switch module includes: a third flyback isolation circuit consisting of a third switching transistor, a fifth transformer, and a third rectifier diode, and a fourth switching transistor, wherein the third switching transistor is connected to the first end of the fifth primary winding of the fifth transformer, the second end of the fifth primary winding is input with the DC voltage signal, and the third rectifier diode is connected to the fifth secondary winding of the fifth transformer. The control of the first isolating switch module to turn on or off the first connection includes: inputting a first switching signal to the third switching transistor, wherein the first switching signal is used by the third flyback isolation circuit to output a first isolating switch signal to the fourth switching transistor to turn on or off the first connection; The second disconnecting switch module includes: a fourth flyback isolation circuit consisting of a fifth switching transistor, a sixth transformer, and a fourth rectifier diode, and a sixth switching transistor, wherein the fifth switching transistor is connected to the first end of the sixth primary winding of the sixth transformer, the second end of the sixth primary winding is input with the DC voltage signal, and the fourth rectifier diode is connected to the sixth secondary winding of the sixth transformer. The control of the second disconnecting switch module to turn on or off the second connection includes: inputting a second switching signal to the fifth switching transistor, the second switching signal being used by the fourth flyback isolation circuit to output a second disconnecting switch signal to the sixth switching transistor to turn on or off the second connection.

7. The method according to claim 6, characterized in that, The voltage conversion circuit further includes a first voltage regulator module, used to regulate the DC voltage signal input to the second terminal of the fifth primary winding and the second terminal of the sixth primary winding.

8. The method according to claim 6, characterized in that, The voltage conversion circuit further includes at least one of the following: a second voltage regulator module and a third voltage regulator module; The second voltage regulator module is connected between the third rectifier diode and the fourth switch transistor, and is used to regulate the voltage of the first isolation switch signal; The third voltage regulator module is connected between the fourth rectifier diode and the sixth switch transistor, and is used to regulate the voltage of the second isolation switch signal.

9. The method according to claim 2, characterized in that, The first filtering module includes a first inductor-capacitor LC filter circuit; The second filtering module includes a second inductor-capacitor LC filter circuit.

10. The method according to claim 9, characterized in that, The first inductor of the first inductor-capacitor LC filter circuit and the second inductor of the second inductor-capacitor LC filter circuit are the same inductor.

11. The method according to claim 2, characterized in that, The circuit parameters also include at least one: the current value corresponding to the first AC voltage signal, and the current value corresponding to the second AC voltage signal; The method further includes at least one of the following: Based on the current value corresponding to the first AC voltage signal, the duty cycle of the first control signal is adjusted to adjust the first voltage signal; Based on the current value corresponding to the second AC voltage signal, the duty cycle of the second control signal is adjusted to adjust the second voltage signal.

12. The method according to any one of claims 1 to 11, characterized in that, The voltage conversion circuit also includes a detection module. The acquisition of circuit parameters includes: acquiring the circuit parameters detected by the detection module.

13. An electronic device, characterized in that, The electronic device: One or more processors; The processor is used to invoke instructions to cause the electronic device to execute the voltage conversion circuit control method according to any one of claims 1 to 12.

14. A storage medium, characterized in that, The storage medium stores instructions that, when executed on an electronic device, cause the electronic device to perform the voltage conversion circuit control method according to any one of claims 1 to 12.

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