Control method and device of AC / DC converter, equipment, medium and product

Abstract

The embodiment of the invention provides a control method and device of an alternating current / direct current converter, equipment, a medium and a product. The alternating current / direct current converter comprises a primary side matrix conversion unit and a secondary side full-bridge conversion unit; the primary side matrix conversion unit and the secondary side full-bridge conversion unit are connected through a high-frequency transformer; the alternating current / direct current converter further comprises a control device, the control device is connected with the primary side matrix conversion unit and the secondary side full-bridge conversion unit, and the method comprises the following steps executed by adopting the control device: obtaining a polarity signal of power grid voltage; configuring a lead or lag state of a first bridge arm and a second bridge arm in the secondary side full-bridge conversion unit according to the polarity signal of the power grid voltage; and based on the lead or lag state of the first bridge arm and the second bridge arm, synchronously executing an expansion phase shift modulation strategy on the primary side matrix conversion unit and the secondary side full-bridge conversion unit. The method is used for achieving the effect of improving the uniformity of the loss distribution of the secondary side switching tube of the single-phase single-stage alternating current / direct current converter.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, and in particular to a control method, apparatus, equipment, medium, and product for an AC / DC converter. Background Technology

[0002] With the rapid development of new energy vehicles, the bidirectional interaction between new energy vehicles and the power grid is becoming more frequent. In scenarios involving bidirectional interaction between new energy vehicles and the power grid, the AC / DC converter, as the core energy conversion interface, undertakes the bidirectional and efficient conversion function between AC power from the power grid and DC energy storage systems in electric vehicles.

[0003] Traditional two-stage isolated AC / DC converters are difficult to meet practical needs due to their large size, heavy weight, and low efficiency.

[0004] The topology of a single-phase, single-stage AC / DC converter eliminates the need for an intermediate voltage regulator, significantly reducing the converter's size and weight. However, in the secondary-side full-bridge converter unit of a single-phase, single-stage AC / DC converter, the switching losses of each switch are unevenly distributed, leading to problems such as localized high temperatures, thermal stress imbalance, and accelerated device aging, thus reducing the converter's operational stability and safety. Summary of the Invention

[0005] This application provides a control method, apparatus, device, medium, and product for an AC / DC converter, which aims to improve the uniformity of the secondary-side switching transistor loss distribution in a single-phase, single-stage AC / DC converter.

[0006] In a first aspect, embodiments of this application provide a control method for an AC / DC converter. The AC / DC converter includes a primary-side matrix converter unit and a secondary-side full-bridge converter unit. The primary-side matrix converter unit and the secondary-side full-bridge converter unit are connected via a high-frequency transformer. The AC / DC converter also includes a control device connected to the primary-side matrix converter unit and the secondary-side full-bridge converter unit. The method includes performing the following steps using the control device:

[0007] Obtain the polarity signal of the mains voltage;

[0008] Based on the polarity signal of the grid voltage, configure the leading or lagging state of the first and second bridge arms in the secondary full-bridge converter unit;

[0009] Based on the leading or lagging states of the first and second bridge arms, the extended phase-shift modulation strategy is synchronously executed on the primary-side matrix transformation unit and the secondary-side full-bridge transformation unit.

[0010] Optionally, configuring the leading or lagging state of the first and second arms in the secondary-side full-bridge converter unit according to the polarity signal of the grid voltage specifically includes:

[0011] When the polarity signal represents the positive half-cycle of the grid voltage, the second bridge arm is set as the leading bridge arm, and the first bridge arm is set as the lagging bridge arm.

[0012] When the polarity signal represents the negative half-cycle of the grid voltage, the first bridge arm is set as the leading bridge arm, and the second bridge arm is set as the lagging bridge arm.

[0013] Optionally, the switching control strategy of the upper tube of the first bridge arm is a first wave transmission strategy; the switching control strategy of the lower tube of the first bridge arm is a second wave transmission strategy; the switching control strategy of the upper tube of the second bridge arm is a third wave transmission strategy; and the switching control strategy of the lower tube of the second bridge arm is a fourth wave transmission strategy.

[0014] The first wave transmission strategy is complementary to the second wave transmission strategy, the third wave transmission strategy is complementary to the fourth wave transmission strategy, and the duty cycle of each wave transmission strategy is 50%.

[0015] Optionally, setting the second bridge arm as the leading bridge arm and the first bridge arm as the lagging bridge arm specifically includes:

[0016] The activation triggering timing of the fourth wave transmission strategy is ahead of the activation triggering timing of the first wave transmission strategy.

[0017] Optionally, setting the first bridge arm as the leading bridge arm and the second bridge arm as the lagging bridge arm specifically includes:

[0018] The activation timing of the first wave transmission strategy is controlled to be ahead of the activation timing of the fourth wave transmission strategy.

[0019] Optionally, configuring the leading or lagging state of the first and second arms in the secondary-side full-bridge converter unit according to the polarity signal of the grid voltage includes:

[0020] Configure the leading or lagging state of the first and second bridge arms within a preset time range before the grid voltage crosses zero.

[0021] Optionally, the step of synchronously executing an extended phase-shift modulation strategy on the primary-side matrix transformation unit and the secondary-side full-bridge transformation unit based on the leading or lagging states of the first and second bridge arms specifically includes:

[0022] Obtain the magnitudes of the inter-bridge phase shift angle and the intra-bridge phase shift angle;

[0023] When the first bridge arm is a leading bridge arm and the second bridge arm is a lagging bridge arm, the conduction triggering timing of the wave transmission strategy corresponding to the first bridge arm is determined according to the dominant transmission timing of the original side matrix transformation unit and the inter-bridge phase shift angle; the conduction triggering timing of the wave transmission strategy corresponding to the second bridge arm is determined according to the conduction triggering timing of the first bridge arm and the intra-bridge phase shift angle.

[0024] When the second bridge arm is a leading bridge arm and the first bridge arm is a lagging bridge arm, the conduction triggering timing of the wave transmission strategy corresponding to the second bridge arm is determined according to the dominant transmission timing of the original side matrix transformation unit and the inter-bridge phase shift angle; the conduction triggering timing of the wave transmission strategy corresponding to the first bridge arm is determined according to the conduction triggering timing of the second bridge arm and the intra-bridge phase shift angle.

[0025] According to the dominant transmission timing of the primary side matrix transformation unit and the conduction triggering timing of each transmission strategy of the first bridge arm and the second bridge arm, the switching transistors of the primary side matrix transformation unit and the secondary side full bridge transformation unit are synchronously controlled.

[0026] Optionally, acquiring the polarity signal of the grid voltage specifically includes:

[0027] Polarity detection is performed on the input grid voltage;

[0028] When the mains voltage is detected to be positive, a polarity signal of the first level state is output; when the mains voltage is detected to be negative, a polarity signal of the second level state is output.

[0029] Secondly, embodiments of this application provide a control device for an AC / DC converter, the AC / DC converter including a primary-side matrix converter unit and a secondary-side full-bridge converter unit; the primary-side matrix converter unit and the secondary-side full-bridge converter unit are connected via a high-frequency transformer; including:

[0030] The acquisition module is used to acquire the polarity signal of the mains voltage;

[0031] The configuration module is used to configure the leading or lagging state of the first and second bridge arms in the secondary full-bridge converter unit according to the polarity signal of the grid voltage.

[0032] The modulation module is used to synchronously execute an extended phase-shift modulation strategy on the primary-side matrix transformation unit and the secondary-side full-bridge transformation unit based on the leading or lagging states of the first and second bridge arms.

[0033] Thirdly, this application provides an electronic device, including: a processor, and a memory communicatively connected to the processor;

[0034] The memory stores computer-executed instructions;

[0035] The processor executes computer execution instructions stored in the memory to implement the method as described in any of the first aspects.

[0036] Fourthly, this application provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, are used to implement the method as described in any of the first aspects.

[0037] Fifthly, this application provides a computer program product, including a computer program that, when executed by a processor, implements the method described in any of the first aspects.

[0038] The control method, apparatus, device, medium, and product for AC / DC converters provided in this application, based on the periodic characteristics of the grid voltage, acquires the polarity signal of the AC voltage and alternately switches the leading or lagging state of the first and second bridge arms in the secondary-side full-bridge converter unit during the positive and negative half-cycles of the grid voltage. This symmetrical design effectively offsets the loss differences between the bridge arms, making the current stress distribution of the switching transistors in the secondary-side full-bridge converter unit more balanced, thereby significantly reducing the temperature gradient of the switching transistors and avoiding thermal stress imbalance caused by local overheating. By dynamically adjusting the leading / lagging state of the bridge arms, the problem of asymmetrical switching losses caused by the alternation of positive and negative half-cycles of the grid voltage in traditional extended phase-shift modulation strategies is solved. At the same time, loss balancing can extend the service life of the switching transistors under high-temperature conditions, reduce the risk of device failure due to thermal aging, and significantly improve the long-term stability and reliability of the system. This method does not require the introduction of additional hardware; loss balancing can be achieved solely through modulation strategy optimization, while retaining the original power regulation capability of extended phase-shift modulation. Attached Figure Description

[0039] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0040] Figure 1 A schematic diagram of a single-phase, single-stage AC / DC converter provided in this application;

[0041] Figure 2 A flowchart illustrating a control method for an AC / DC converter provided in an embodiment of this application;

[0042] Figure 3 A timing diagram of a single-phase, single-stage AC / DC converter provided in this application embodiment;

[0043] Figure 4 A timing diagram of another single-phase single-stage AC / DC converter provided in an embodiment of this application;

[0044] Figure 5 A schematic diagram of the structure of a control device for an AC / DC converter provided in an embodiment of this application;

[0045] Figure 6 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application.

[0046] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0047] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0048] Figure 1 A schematic diagram of a single-phase, single-stage AC / DC converter provided in this application is shown below. Figure 1 As shown,

[0049] The single-phase, single-stage AC / DC converter topology includes: a primary-side matrix converter unit, a high-frequency transformer, and a secondary-side full-bridge converter unit. The primary-side matrix converter unit consists of four bidirectional switches, each formed by two two-quadrant switches connected with a common emitter. The first bidirectional bridge arm of the primary-side matrix converter unit includes: a positive group of switches (switches S11 and S41) and a negative group of switches (switches S12 and S42); the second bidirectional bridge arm of the primary-side matrix converter unit includes: a positive group of switches (switches S21 and S31) and a negative group of switches (switches S22 and S32).

[0050] One side of the primary-side matrix converter unit is connected to the power grid (AC source), and the other side is connected to a high-frequency transformer. The high-frequency transformer has a turns ratio of 1:n, and its equivalent leakage inductance is denoted as Lt. The other side of the high-frequency transformer is connected to the secondary-side full-bridge converter unit. The secondary-side full-bridge converter unit includes four two-quadrant switches S5, S6, S7, and S8. Switch S5 is the upper switch of the first bridge arm, switch S6 is the lower switch of the first bridge arm, switch S7 is the upper switch of the second bridge arm, and switch S8 is the lower switch of the second bridge arm. The other side of the secondary-side full-bridge converter unit is connected in parallel with the energy storage (DC source) of the new energy vehicle.

[0051] When the AC source voltage is considered in terms of positive and negative half-cycles, the primary-side matrix transformation unit is equivalent to two inverse full-bridge converters connected in parallel. Therefore, it can form a dual active bridge converter with the DC-side full-bridge structure and the high-frequency isolation transformer.

[0052] During power regulation, the traditional Extended Phase Shift (EPS) strategy achieves bidirectional control of energy flow by introducing the phase shift angle between the primary and secondary bridges and the phase shift angle between the bridge arms within the secondary full-bridge converter unit.

[0053] However, this strategy, during the alternation of positive and negative half-cycles of the grid voltage, introduces a phase shift angle within the bridge, leading to an imbalance in the current stress distribution of the switching transistors in the secondary-side full-bridge converter unit. This results in significant loss differences between the switching transistors in different bridge arms. For example, during the positive half-cycle, the switching losses of the leading bridge arms (such as S7 and S8) are significantly lower than those of the lagging bridge arms (such as S5 and S6), while this loss difference reverses during the negative half-cycle. Since switching losses are proportional to the instantaneous switching current, this asymmetry causes a significant temperature gradient in the power semiconductor devices at different locations within the secondary-side full-bridge converter unit. Under continuous operation, this disrupts the system's thermal equilibrium. The thermal stress imbalance between devices accelerates the material aging process of the high-temperature switching transistors, causing some devices in the secondary-side full-bridge converter unit to prematurely enter failure modes, ultimately affecting system reliability.

[0054] Therefore, how to achieve uniformity of switching losses in the secondary-side full-bridge converter unit has become an urgent technical problem to be solved in order to reduce the risk of thermal imbalance and improve system reliability.

[0055] In view of this, this application provides a control method for an AC / DC converter. By alternately selecting the leading or lagging arm of the secondary full-bridge converter unit in each power frequency cycle, a symmetrical distribution of switching losses is achieved under the alternating positive and negative half-cycles of the grid voltage, thereby eliminating the loss difference between the switching transistors and reducing the risk of thermal imbalance. This strategy does not require additional hardware costs; loss balancing can be achieved solely through modulation strategy optimization, while maintaining the original power regulation capability of EPS modulation. It solves the thermal management problem caused by uneven loss distribution in existing technologies and provides technical assurance for the long-term stable operation of single-phase single-stage AC / DC converters in high-power applications.

[0056] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0057] The execution subject of this application embodiment can be, for example, a control device, or an electronic device equipped with a control device. This application embodiment uses a control device as an example for illustrative explanation.

[0058] Figure 2 This application provides a flowchart illustrating a control method for an AC / DC converter. The AC / DC converter includes a primary-side matrix converter unit and a secondary-side full-bridge converter unit. The primary-side matrix converter unit and the secondary-side full-bridge converter unit are connected via a high-frequency transformer. The AC / DC converter also includes a control device connected to the primary-side matrix converter unit and the secondary-side full-bridge converter unit. Figure 2 As shown, the method includes performing the following steps using a control device:

[0059] S201. Obtain the polarity signal of the mains voltage;

[0060] The polarity signal of the grid voltage indicates the positive and negative half-cycle states of the AC voltage. The positive half-cycle corresponds to a voltage above zero, and the negative half-cycle corresponds to a voltage below zero.

[0061] In one example, obtaining the polarity signal of the mains voltage specifically includes:

[0062] Polarity detection is performed on the input grid voltage;

[0063] When the mains voltage is detected to be positive, a polarity signal of the first level state is output; when the mains voltage is detected to be negative, a polarity signal of the second level state is output.

[0064] For example, the polarity of the AC voltage can be detected in real time by a voltage sampling circuit, and a polarity signal representing the positive and negative half-cycles can be output; the first level state can be, for example, a high-level signal, and the second level state can be a low-level signal; or, the first level state can be, for example, a low-level signal, and the second level state can be a high-level signal. This application does not limit this specific to the embodiments described herein.

[0065] The alternating characteristics of the analog grid voltage are converted into digital control signals, enabling the controller to quickly identify the grid operating phase. This provides phase synchronization assurance for the subsequent accurate triggering of the switching of the bridge arm in the advanced or lagging state, avoiding bridge arm switching delays or false triggering caused by phase judgment deviations.

[0066] S202. Configure the leading or lagging state of the first and second bridge arms in the secondary full-bridge converter unit according to the polarity signal of the grid voltage.

[0067] The leading or lagging state of the bridge arm indicates the switching order of the two bridge arms in the secondary full-bridge conversion unit. The leading bridge arm performs the switching operation first, and the lagging bridge arm performs the switching operation later.

[0068] For example, during the positive half-cycle, one set of bridge arms is selected as the leading bridge arm, and the other set as the lagging bridge arm; during the negative half-cycle, the bridge arm states are reversed. For example, during the positive half-cycle, the first bridge arm is selected as the leading bridge arm, and the second bridge arm as the lagging bridge arm; during the negative half-cycle, the second bridge arm is selected as the leading bridge arm, and the first bridge arm as the lagging bridge arm; conversely, during the positive half-cycle, the second bridge arm is selected as the leading bridge arm, and the first bridge arm as the lagging bridge arm; during the negative half-cycle, the first bridge arm is selected as the leading bridge arm, and the second bridge arm as the lagging bridge arm; the embodiments of this application do not limit this.

[0069] The entire process involves periodically alternating the states of the bridge arms. For example, during the positive half-cycle, one set of bridge arms (such as switches S7 and S8) acts as the leading bridge arm with lower switching losses; during the negative half-cycle, another set of bridge arms (such as switches S5 and S6) acts as the leading bridge arm, also with lower losses. This ensures that the switching loss distribution is symmetrical under both positive and negative half-cycle conditions, thereby eliminating loss differences.

[0070] S203. Based on the leading or lagging states of the first and second bridge arms, the extended phase-shifting modulation strategy is synchronously executed on the primary side matrix transformation unit and the secondary side full-bridge transformation unit.

[0071] Extended phase-shift modulation strategy is a modulation method that introduces inter-bridge phase shift angle and intra-bridge phase shift angle to adjust power transmission. It achieves bidirectional control of energy flow by controlling the on / off timing of the switching transistors.

[0072] For example, when the first bridge arm is a leading bridge arm, the conduction triggering timing of the corresponding wave transmission strategy for the first bridge arm can be determined based on the dominant transmission timing of the primary side matrix transformation unit and the inter-bridge phase shift angle. Then, based on the conduction triggering timing of the first bridge arm and the intra-bridge phase shift angle, the conduction triggering timing of the corresponding wave transmission strategy for the second bridge arm can be determined. When the second bridge arm is a delayed bridge arm, the conduction triggering timing of the corresponding wave transmission strategy for the second bridge arm can be determined based on the dominant transmission timing of the primary side matrix transformation unit and the inter-bridge phase shift angle. Then, based on the conduction triggering timing of the second bridge arm and the intra-bridge phase shift angle, the conduction triggering timing of the corresponding wave transmission strategy for the first bridge arm can be determined.

[0073] Based on the dominant transmission timing of the matrix converter and the corresponding transmission strategies of the first and second bridge arms, the switching transistors of the primary-side matrix converter unit and the secondary-side full-bridge converter unit are controlled to turn on or off, thereby achieving coordinated modulation between the primary-side matrix converter unit and the secondary-side full-bridge converter unit and completing the converter's power transmission regulation. This method does not affect the secondary-side output voltage and power transmission.

[0074] This method leverages the periodic characteristics of the grid voltage. By acquiring the polarity signal of the AC voltage, it alternates the lead or lag state of the first and second bridge arms in the secondary-side full-bridge converter unit during the positive and negative half-cycles of the grid voltage. This symmetrical design effectively offsets the loss differences between the bridge arms, making the current stress distribution of the switching transistors in the secondary-side full-bridge converter unit more balanced, thereby significantly reducing the temperature gradient of the switching transistors and avoiding thermal stress imbalance caused by local overheating. By dynamically adjusting the lead / lag state of the bridge arms, it solves the problem of asymmetrical switching losses caused by the alternation of positive and negative half-cycles of the grid voltage in traditional extended phase-shift modulation strategies. Simultaneously, loss balancing extends the lifespan of the switching transistors under high-temperature conditions, reduces the risk of device failure due to thermal aging, and significantly improves the long-term stability and reliability of the system. This method requires no additional hardware; loss balancing can be achieved solely through modulation strategy optimization, while retaining the power regulation capability of the original extended phase-shift modulation.

[0075] Furthermore, when the polarity signal characterizes the grid voltage in the positive half-cycle, the second bridge arm is set as the leading bridge arm, and the first bridge arm is set as the lagging bridge arm.

[0076] When the polarity signal represents the negative half-cycle of the grid voltage, the first bridge arm is set as the leading bridge arm, and the second bridge arm is set as the lagging bridge arm.

[0077] In the secondary-side full-bridge transform unit, the two sets of mutually symmetrical bridge arms are called the first bridge arm and the second bridge arm, as referenced. Figure 1 For example, switching transistors S5 and S6 form the first bridge arm; switching transistors S7 and S8 form the second bridge arm.

[0078] During the positive half-cycle of the AC voltage, the controller sets the second bridge arm as the leading bridge arm based on the polarity signal, giving it priority in switching operations. During the negative half-cycle, the controller sets the first bridge arm as the leading bridge arm, achieving symmetrical switching of the bridge arm states. This process ensures symmetrical distribution of switching losses under both positive and negative half-cycle conditions through the periodic alternation of bridge arm states. For example, during the positive half-cycle, the bridge arm composed of switching transistors S7 and S8 is the leading bridge arm with lower switching losses; during the negative half-cycle, the bridge arm composed of switching transistors S5 and S6 is also the leading bridge arm with similarly low losses.

[0079] By periodically alternating the bridge arm states, a symmetrical distribution of switching losses under positive and negative half-cycle conditions is achieved. This technique directly eliminates the loss differences caused by changes in grid voltage polarity, significantly reduces the temperature gradient of the secondary-side full-bridge switches, and avoids thermal stress imbalance caused by local overheating. Furthermore, the symmetrical design extends the lifespan of high-temperature switches, reduces the risk of device failure due to thermal aging, and improves the system's stability during long-term operation.

[0080] The following explains how to configure the lead or lag state of the first and second bridge arms in the secondary full-bridge converter unit.

[0081] For example, by configuring a suitable switching control strategy for the switching transistors of the secondary full-bridge converter, the first and second bridge arms can be configured to lead or lag states.

[0082] For example, the switching control strategy of the upper tube of the first bridge arm is the first wave transmission strategy; the switching control strategy of the lower tube of the first bridge arm is the second wave transmission strategy; the switching control strategy of the upper tube of the second bridge arm is the third wave transmission strategy; and the switching control strategy of the lower tube of the second bridge arm is the fourth wave transmission strategy.

[0083] Among them, the first wave-launching strategy and the second wave-launching strategy are complementary in state, the third wave-launching strategy and the fourth wave-launching strategy are complementary in state, and the duty cycle of each wave-launching strategy is 50%.

[0084] In this embodiment, state complementarity means that when the upper tube of the first bridge arm is on, the lower tube of the first bridge arm is off; when the upper tube of the second bridge arm is on, the lower tube of the second bridge arm is off. Conversely, when the upper tube of the first bridge arm is off, the lower tube of the first bridge arm is on; when the upper tube of the second bridge arm is off, the lower tube of the second bridge arm is on.

[0085] The first and second wave generation strategies are complementary in state, as are the third and fourth wave generation strategies, achieving mutually exclusive conduction of the upper and lower transistors within the same bridge arm and preventing short circuits. Each strategy has a 50% duty cycle, ensuring complete coverage of the switching cycle for each bridge arm, guaranteeing continuous energy transfer, and preventing increased output voltage ripple or current surges caused by current interruptions.

[0086] By binding the upper and lower pipes of the bridge arm with the wave generation strategy, clarifying the complementary relationship of the strategies within the bridge arm and the 50% duty cycle constraint, the risk of bridge arm short circuit and current interruption can be effectively avoided, ensuring continuous and reliable energy transmission.

[0087] In one example, the activation timing of the fourth wave transmission strategy can be controlled to be ahead of the activation timing of the first wave transmission strategy, the second bridge arm can be set as the leading bridge arm, and the first bridge arm can be set as the lagging bridge arm.

[0088] The conduction triggering timing of the fourth wave transmission strategy is ahead of the conduction triggering timing of the first wave transmission strategy. This can control the conduction time of the lower tube (S8) of the second bridge arm to be ahead of the conduction time of the upper tube (S5) of the first bridge arm, thereby configuring the second bridge arm composed of switching tubes S7 and S8 as the leading bridge arm, and configuring the first bridge arm composed of switching tubes S5 and S6 as the lagging bridge arm.

[0089] By defining the lead relationship between the fourth wave generation strategy and the first wave generation strategy, the state configuration of the second bridge arm as the leading arm and the first bridge arm as the lagging arm is realized, providing a core timing reference for the state switching and loss balancing of the positive and negative half-cycle bridge arms.

[0090] In another example, the first bridge arm can be set as the leading bridge arm and the second bridge arm as the lagging bridge arm by controlling the conduction triggering timing of the first wave transmission strategy to be ahead of the conduction triggering timing of the fourth wave transmission strategy.

[0091] The conduction triggering timing of the first wave transmission strategy is ahead of the conduction triggering timing of the fourth wave transmission strategy. This can control the conduction time of the upper tube (S5) of the first bridge arm to be ahead of the conduction time of the lower tube (S8) of the second bridge arm, thereby configuring the first bridge arm composed of switch tube S5 and switch tube S6 as a lagging bridge arm, and configuring the second bridge arm composed of switch tube S7 and switch tube S8 as a leading bridge arm.

[0092] By defining the lead relationship between the first and fourth wave transmission strategies and the conduction timing, the state configuration of the first bridge arm as the leading arm and the second bridge arm as the lagging arm is realized, providing a core timing reference for the state switching and loss balancing of the positive and negative half-cycle bridge arms.

[0093] Furthermore, based on the polarity signal of the grid voltage, the leading or lagging states of the first and second arms in the secondary-side full-bridge converter unit are configured, specifically including:

[0094] Configure the leading or lagging state of the first and second bridge arms within a preset time range before the grid voltage crosses zero.

[0095] The zero-crossing point of AC voltage refers to the moment when the voltage value in the AC voltage waveform is zero. The preset time range can be a preset time window before the zero-crossing point, for example, 100µs.

[0096] Within a preset time range (e.g., 100μs) before the AC voltage crosses zero, the controller completes the switching of the bridge arm state to avoid switching operations during voltage transient changes. For example, the bridge arm state is switched from the positive half-cycle to the negative half-cycle 100μs before the zero-crossing point to ensure that the switching operation is performed when the voltage is close to zero.

[0097] By adjusting the bridge arm state before the voltage zero-crossing point, the instantaneous current surge during switching is reduced, thereby decreasing switching losses and electromagnetic interference (EMI). This technique improves the system's stability under voltage surge conditions and further optimizes thermal management capabilities.

[0098] The following explains how to synchronously execute the extended phase-shift modulation strategy on the primary-side matrix transformation unit and the secondary-side full-bridge transformation unit based on the leading or lagging states of the first and second bridge arms.

[0099] In one example, (1) obtain the magnitudes of the inter-bridge phase shift angle and the intra-bridge phase shift angle;

[0100] The inter-bridge phase shift angle is an angle that can characterize the phase shift ratio between the primary and secondary sides of the entire bridge. By adjusting the size of the inter-bridge phase shift angle, the effective duration of the voltage difference between the primary and secondary sides can be changed, thereby adjusting the energy transfer power between the primary and secondary sides.

[0101] The phase shift angle inside the bridge is the angle that characterizes the phase shift ratio between the two arms of the secondary full-bridge converter unit. By adjusting the size of the phase shift angle inside the bridge, the voltage pulse width of the secondary side can be adjusted.

[0102] For example, the magnitudes of the inter-bridge phase shift angle and the intra-bridge phase shift angle can be obtained based on the converter's transmission power adjustment requirements and the secondary arm loss equalization target. The calculation methods for the inter-bridge phase shift angle and the intra-bridge phase shift angle can be referred to the description of the prior art, and will not be repeated here.

[0103] (2) When the first bridge arm is a leading bridge arm and the second bridge arm is a lagging bridge arm, the conduction triggering timing of the wave generation strategy corresponding to the first bridge arm is determined according to the dominant wave generation timing of the original side matrix transformation unit and the inter-bridge phase shift angle; the conduction triggering timing of the wave generation strategy corresponding to the second bridge arm is determined according to the conduction triggering timing of the first bridge arm and the inter-bridge phase shift angle.

[0104] When the second bridge arm is a leading bridge arm and the first bridge arm is a lagging bridge arm, the conduction triggering timing of the wave transmission strategy corresponding to the second bridge arm is determined based on the dominant transmission timing of the original side matrix transformation unit and the inter-bridge phase shift angle; the conduction triggering timing of the wave transmission strategy corresponding to the first bridge arm is determined based on the conduction triggering timing of the second bridge arm and the intra-bridge phase shift angle.

[0105] (3) According to the dominant transmission timing of the primary side matrix transformation unit and the conduction triggering timing of each transmission strategy of the first and second bridge arms, the switching transistors of the primary side matrix transformation unit and the secondary side full bridge transformation unit are synchronously controlled.

[0106] The primary-side matrix converter's dominant transmission timing can serve as a global reference for initiating energy transfer. The secondary-side switching timing is derived based on this reference signal, combined with the inter-bridge and intra-bridge phase shift angles, ultimately achieving synchronous modulation between the primary-side matrix converter and the secondary-side full-bridge converter.

[0107] Reference Figure 1 Taking the example of switch S5 as the upper tube of the first bridge arm, switch S6 as the lower tube of the first bridge arm, switch S7 as the upper tube of the second bridge arm, and switch S8 as the lower tube of the second bridge arm.

[0108] For example, during the negative half-cycle of the grid voltage, if the first bridge arm is a leading bridge arm and the second bridge arm is a lagging bridge arm, the dominant transmission timing of the primary side matrix transformation unit can be set to the conduction time of S11. Combined with the inter-bridge phase shift angle, the conduction trigger timing of the upper tube (S5) of the first bridge arm corresponding to the transmission strategy can be determined. Based on the conduction trigger timing of the upper tube (S5) of the first bridge arm, and combined with the intra-bridge phase shift angle, the conduction trigger timing of the lower tube (S8) of the second bridge arm corresponding to the transmission strategy can be determined. The conduction trigger timing of the lower tube (S6) of the first bridge arm is complementary to the conduction trigger timing of the upper tube (S5) of the first bridge arm. The conduction trigger timing of the upper tube (S7) of the second bridge arm is complementary to the conduction trigger timing of the lower tube (S8) of the second bridge arm.

[0109] Similarly, if the second bridge arm is a leading bridge arm and the first bridge arm is a lagging bridge arm, the dominant transmission timing of the primary side matrix transformation unit can be set to the conduction time of S12. Combined with the inter-bridge phase shift angle, the conduction trigger timing of the lower tube (S8) of the second bridge arm corresponding to the transmission strategy can be determined. Based on the conduction trigger timing of the lower tube (S8) of the second bridge arm, and combined with the intra-bridge phase shift angle, the conduction trigger timing of the upper tube (S5) of the first bridge arm corresponding to the transmission strategy can be determined. The conduction trigger timing of the lower tube (S6) of the first bridge arm is complementary to the conduction trigger timing of the upper tube (S5) of the first bridge arm. The conduction trigger timing of the upper tube (S7) of the second bridge arm is complementary to the conduction trigger timing of the lower tube (S8) of the second bridge arm.

[0110] By synchronously outputting the drive signals of each switch in both the primary-side matrix converter and the secondary-side full-bridge converter according to the dominant transmission timing of the primary-side matrix converter and the conduction triggering timing of each transmission strategy in the secondary-side matrix converter, coordinated modulation of the primary-side matrix converter and the secondary-side full-bridge converter can be achieved, thus completing the power transmission regulation of the converter. This method does not affect the output voltage and power transmission of the secondary side.

[0111] Figure 3 A timing diagram of a single-phase, single-stage AC / DC converter provided in this application embodiment is shown below. Figure 3 As shown, this corresponds to the case where the grid voltage is in the positive half-cycle.

[0112] Figure 4 A timing diagram of another single-phase, single-stage AC / DC converter provided in this application embodiment is shown below. Figure 4 As shown, this corresponds to the case where the grid voltage is in the negative half-cycle.

[0113] The primary-side matrix transformation unit is used to convert the grid voltage into a high-frequency AC square wave voltage Vab output, providing a high-frequency carrier for subsequent high-frequency transformer energy transmission.

[0114] The primary-side output voltage Vab is the voltage waveform at the output terminals (nodes a and b) of the primary-side matrix transformation unit.

[0115] The secondary-side output voltage Vcd is the voltage waveform at the output terminals (nodes c and d) of the full-bridge secondary side. When switches S8 and S5 are turned on, a current loop is formed connecting the transformer secondary side, switch S5, node c, the load, node d, switch S8, and the transformer secondary side. The potential at point c is higher than that at point d, and Vcd outputs a positive voltage. When switches S7 and S6 are turned on, a current loop is formed connecting the transformer secondary side, switch S6, node d, the load, node c, switch S7, and the transformer secondary side. The potential at point d is higher than that at point c, and Vcd outputs a negative voltage.

[0116] V L The voltage across the equivalent leakage inductance Lt of the high-frequency transformer is determined by the voltage difference between the primary output voltage Vab and the secondary output voltage Vcd. L This indicates the current flowing through the inductor.

[0117] like Figure 3 As shown, when the grid voltage is in the positive half-cycle, the positive group switch in the primary side matrix converter unit is kept on; the fifth wave transmission strategy is used to control the reverse group switch of the first bidirectional bridge arm in the primary side matrix converter unit; the sixth wave transmission strategy is used to control the reverse group switch of the second bidirectional bridge arm in the primary side matrix converter unit; the fifth wave transmission strategy and the sixth wave transmission strategy are complementary and have a duty cycle of 50%.

[0118] In this embodiment, switches S11, S21, S31, and S41 in the primary side matrix transformation unit remain on; switches S12 and S42 in the primary side matrix transformation unit are simultaneously on and off; switches S22 and S32 in the primary side matrix transformation unit are simultaneously on and off; when switches S12 and S42 are on, switches S22 and S32 are off, and vice versa.

[0119] The second bridge arm, composed of switches S8 and S7, is designated as the leading bridge arm, while the first bridge arm, composed of switches S5 and S6, is designated as the lagging bridge arm. The turn-on time of switch S8 precedes that of switch S5.

[0120] Extended phase-shift modulation takes the starting moment of the positive square wave of the output voltage Vab of the primary side matrix transformation unit, i.e. the conduction moment of the reverse group switches S12 and S42 of the first bidirectional bridge arm, as the reference. Based on the magnitude of the inter-bridge phase shift angle, the fourth wave generation strategy corresponding to the lower tube (S8) of the second bridge arm can be determined. Based on the intra-bridge phase shift angle, the first wave generation strategy corresponding to the upper tube (S5) of the first bridge arm can be obtained. Based on the complementarity of the first and second wave generation strategies, and the complementarity of the third and fourth wave generation strategies, the second wave generation strategy corresponding to the lower tube (S6) of the first bridge arm and the third wave generation strategy corresponding to the upper tube (S7) of the second bridge arm can be obtained.

[0121] By synchronously outputting the drive signals of each switch in the primary-side matrix converter and the secondary-side full-bridge converter according to the waveform generation strategies of the primary-side matrix converter and the secondary-side full-bridge converter, the coordinated modulation of the primary-side matrix converter and the secondary-side full-bridge converter can be realized, thereby completing the power transmission regulation of the converter.

[0122] Continue as Figure 3 As shown, S7 turns off and S8 turns on at time t0, and then S6 turns off and S5 turns on at time t1. However, the inductor current at time t1 is significantly greater than the inductor current at time t0. This is because the magnitude of switching losses is related to the magnitude of the instantaneous current flowing through the switching transistor. Consequently, the turn-off loss at S6 will be much greater than the turn-off loss at S7. Similarly, because the current at time t3 is greater than the current at time t2, the turn-off loss at S5 will be greater than the turn-off loss at S8. Due to the symmetry of the inductor current, the turn-off current of the same bridge arm is the same. In summary, the switching losses of S5 and S6 are almost identical, but greater than the switching losses of S7 and S8.

[0123] like Figure 4 As shown, when the grid voltage is in the negative half-cycle, the negative group switch in the primary side matrix converter unit is kept on; the positive group switch of the first bidirectional bridge arm in the primary side matrix converter unit is controlled by the seventh wave transmission strategy; the positive group switch of the second bidirectional bridge arm in the primary side matrix converter unit is controlled by the eighth wave transmission strategy; the seventh wave transmission strategy and the eighth wave transmission strategy are complementary and have a duty cycle of 50%.

[0124] In this embodiment, switches S12, S22, S32, and S42 in the primary side matrix transformation unit remain on; switches S11 and S41 in the primary side matrix transformation unit are simultaneously on and off; switches S21 and S31 in the primary side matrix transformation unit are simultaneously on and off; when switches S11 and S41 are on, switches S21 and S31 are off, and vice versa.

[0125] The first bridge arm, composed of switches S5 and S6, is designated as the overdue bridge arm, while the second bridge arm, composed of switches S8 and S7, is designated as the lagging bridge arm. The turn-on time of switch S5 precedes that of switch S8.

[0126] Extended phase-shift modulation takes the starting moment of the positive square wave of the output voltage Vab of the primary side matrix transformation unit, i.e. the conduction moment of the reverse group switches S12 and S42 of the first bidirectional bridge arm, as the reference. Based on the magnitude of the inter-bridge phase shift angle, the first wave generation strategy corresponding to the upper tube (S5) of the first bridge arm can be determined. Based on the intra-bridge phase shift angle, the fourth wave generation strategy corresponding to the lower tube (S8) of the second bridge arm can be obtained. Based on the complementarity of the first and second wave generation strategies, and the complementarity of the third and fourth wave generation strategies, the second wave generation strategy corresponding to the lower tube (S6) of the first bridge arm and the third wave generation strategy corresponding to the upper tube (S7) of the second bridge arm can be obtained.

[0127] By synchronously outputting the drive signals of each switch in the primary-side matrix converter and the secondary-side full-bridge converter according to the waveform generation strategies of the primary-side matrix converter and the secondary-side full-bridge converter, the coordinated modulation of the primary-side matrix converter and the secondary-side full-bridge converter can be realized, thereby completing the power transmission regulation of the converter.

[0128] Continue as Figure 4 As shown, S6 turns off and S5 turns on at time t0, and then S7 turns off and S8 turns on at time t1. However, the inductor current at time t1 is significantly greater than the inductor current at time t0. This results in the turn-off loss of S7 being much greater than that of S6. Similarly, because the current at time t3 is greater than the current at time t2, the turn-off loss of S8 will be greater than that of S5. Due to the symmetry of the inductor current, the turn-off current of the same bridge arm is the same. In summary, the switching losses of S7 and S8 are almost identical, but greater than those of S5 and S6.

[0129] Under stable operating conditions, the alternating selection of the lead and lag bridge arms can satisfy the loss balance target of the secondary-side switching transistors.

[0130] Figure 5 This is a schematic diagram of the structure of a control device for an AC / DC converter provided in an embodiment of this application. The AC / DC converter includes a primary-side matrix converter unit and a secondary-side full-bridge converter unit; the primary-side matrix converter unit and the secondary-side full-bridge converter unit are connected through a high-frequency transformer; as shown... Figure 5 As shown, the control device provided in this embodiment includes: an acquisition module 501, a configuration module 502, and a modulation module 503.

[0131] Acquisition module 501 is used to acquire the polarity signal of the power grid voltage;

[0132] Configuration module 502 is used to configure the leading or lagging state of the first and second bridge arms in the secondary full-bridge converter unit according to the polarity signal of the grid voltage.

[0133] The modulation module 503 is used to synchronously execute an extended phase-shift modulation strategy on the primary side matrix transformation unit and the secondary side full-bridge transformation unit based on the leading or lagging states of the first and second bridge arms.

[0134] One possible implementation is that the configuration module 502 is specifically used to set the second bridge arm as the leading bridge arm and the first bridge arm as the lagging bridge arm when the polarity signal characterizes the grid voltage as the positive half-cycle.

[0135] When the polarity signal represents the negative half-cycle of the grid voltage, the first bridge arm is set as the leading bridge arm, and the second bridge arm is set as the lagging bridge arm.

[0136] One possible implementation is that the switching control strategy of the upper tube of the first bridge arm is a first wave transmission strategy; the switching control strategy of the lower tube of the first bridge arm is a second wave transmission strategy; the switching control strategy of the upper tube of the second bridge arm is a third wave transmission strategy; and the switching control strategy of the lower tube of the second bridge arm is a fourth wave transmission strategy.

[0137] Among them, the first wave-launching strategy and the second wave-launching strategy are complementary in state, the third wave-launching strategy and the fourth wave-launching strategy are complementary in state, and the duty cycle of each wave-launching strategy is 50%.

[0138] One possible implementation is a configuration module 502, used to set the second bridge arm as the leading bridge arm and the first bridge arm as the lagging bridge arm, specifically including:

[0139] The activation timing of the fourth wave transmission strategy is ahead of the activation timing of the first wave transmission strategy.

[0140] One possible implementation is a configuration module 502, used to set the first bridge arm as the leading bridge arm and the second bridge arm as the lagging bridge arm, specifically including:

[0141] The activation timing of the first wave transmission strategy is ahead of the activation timing of the fourth wave transmission strategy.

[0142] One possible implementation is a configuration module 502, which is used to configure the advanced or lagging state of the first bridge arm and the second bridge arm within a preset time range before the grid voltage crosses zero.

[0143] One possible implementation is that the modulation module 503 is specifically used to obtain the magnitudes of the inter-bridge phase shift angle and the intra-bridge phase shift angle;

[0144] When the first bridge arm is a leading bridge arm and the second bridge arm is a lagging bridge arm, the conduction triggering timing of the wave transmission strategy corresponding to the first bridge arm is determined based on the dominant transmission timing of the original side matrix transformation unit and the inter-bridge phase shift angle; the conduction triggering timing of the wave transmission strategy corresponding to the second bridge arm is determined based on the conduction triggering timing of the first bridge arm and the intra-bridge phase shift angle.

[0145] When the second bridge arm is a leading bridge arm and the first bridge arm is a lagging bridge arm, the conduction triggering timing of the wave transmission strategy corresponding to the second bridge arm is determined based on the dominant transmission timing of the original side matrix transformation unit and the inter-bridge phase shift angle; the conduction triggering timing of the wave transmission strategy corresponding to the first bridge arm is determined based on the conduction triggering timing of the second bridge arm and the intra-bridge phase shift angle.

[0146] According to the dominant transmission timing of the primary side matrix transformation unit and the conduction triggering timing of each transmission strategy of the first and second bridge arms, the switching transistors of the primary side matrix transformation unit and the secondary side full-bridge transformation unit are synchronously controlled.

[0147] One possible implementation is that the acquisition module 501 is specifically used to detect the polarity of the input grid voltage;

[0148] When the mains voltage is detected to be positive, a polarity signal of the first level state is output; when the mains voltage is detected to be negative, a polarity signal of the second level state is output.

[0149] The control device for the AC / DC converter provided in this embodiment can execute the method provided in the above method embodiment. Its implementation principle and technical effect are similar, and will not be described in detail here.

[0150] Figure 6 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Figure 6 As shown, the electronic device may include at least one processor 601 and a memory 602.

[0151] The memory 602 is used to store programs. Specifically, the program may include program code, which includes computer operation instructions.

[0152] The memory 602 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0153] The processor 601 is used to execute computer execution instructions stored in the memory 602 to implement the actions in the foregoing method embodiments. The processor 601 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application.

[0154] Optionally, the electronic device may also include a communication interface 603 for communication and interaction with external devices. In specific implementations, if the communication interface 603, memory 602, and processor 601 are implemented independently, the communication interface 603, memory 602, and processor 601 can be interconnected via a bus to complete communication between them.

[0155] Optionally, in a specific implementation, if the communication interface 603, memory 602, and processor 601 are integrated on a single chip, then the communication interface 603, memory 602, and processor 601 can communicate through an internal interface.

[0156] This application also provides a computer-readable storage medium, which may include various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), and a random access memory (RAM). Specifically, the computer-readable storage medium stores program instructions, which are used to implement the actions of the above-described method implementation.

[0157] This application also provides a computer program product including executable instructions stored in a readable storage medium. At least one processor of an electronic device can read the executable instructions from the readable storage medium, and the at least one processor executes the executable instructions to cause the electronic device to perform the actions described in the method embodiments.

[0158] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A control method for an AC / DC converter, characterized in that, The AC / DC converter includes a primary-side matrix converter unit and a secondary-side full-bridge converter unit; the primary-side matrix converter unit and the secondary-side full-bridge converter unit are connected via a high-frequency transformer; the AC / DC converter also includes a control device connected to the primary-side matrix converter unit and the secondary-side full-bridge converter unit, and the method includes performing the following steps using the control device: Obtain the polarity signal of the mains voltage; Based on the polarity signal of the grid voltage, configure the leading or lagging state of the first and second bridge arms in the secondary full-bridge converter unit; Based on the leading or lagging states of the first and second bridge arms, the extended phase-shift modulation strategy is synchronously executed on the primary-side matrix transformation unit and the secondary-side full-bridge transformation unit.

2. The method according to claim 1, characterized in that, The step of configuring the leading or lagging state of the first and second arms in the secondary-side full-bridge converter unit according to the polarity signal of the grid voltage specifically includes: When the polarity signal represents the positive half-cycle of the grid voltage, the second bridge arm is set as the leading bridge arm, and the first bridge arm is set as the lagging bridge arm. When the polarity signal represents the negative half-cycle of the grid voltage, the first bridge arm is set as the leading bridge arm, and the second bridge arm is set as the lagging bridge arm.

3. The method according to claim 2, characterized in that, The switching control strategy for the upper tube of the first bridge arm is the first wave transmission strategy; the switching control strategy for the lower tube of the first bridge arm is the second wave transmission strategy; the switching control strategy for the upper tube of the second bridge arm is the third wave transmission strategy; and the switching control strategy for the lower tube of the second bridge arm is the fourth wave transmission strategy. The first wave transmission strategy is complementary to the second wave transmission strategy, the third wave transmission strategy is complementary to the fourth wave transmission strategy, and the duty cycle of each wave transmission strategy is 50%.

4. The method according to claim 3, characterized in that, The specific details of setting the second bridge arm as the leading bridge arm and the first bridge arm as the lagging bridge arm include: The activation triggering timing of the fourth wave transmission strategy is ahead of the activation triggering timing of the first wave transmission strategy.

5. The method according to claim 3, characterized in that, The specific details of setting the first bridge arm as the leading bridge arm and the second bridge arm as the lagging bridge arm include: The activation timing of the first wave transmission strategy is controlled to be ahead of the activation timing of the fourth wave transmission strategy.

6. The method according to claim 1, characterized in that, The step of configuring the leading or lagging state of the first and second bridge arms in the secondary-side full-bridge converter unit according to the polarity signal of the grid voltage includes: Configure the leading or lagging state of the first and second bridge arms within a preset time range before the grid voltage crosses zero.

7. The method according to claim 1, characterized in that, The step of synchronously executing an extended phase-shift modulation strategy on the primary-side matrix transformation unit and the secondary-side full-bridge transformation unit based on the leading or lagging states of the first and second bridge arms specifically includes: Obtain the magnitudes of the inter-bridge phase shift angle and the intra-bridge phase shift angle; When the first bridge arm is a leading bridge arm and the second bridge arm is a lagging bridge arm, the conduction triggering timing of the wave transmission strategy corresponding to the first bridge arm is determined according to the dominant transmission timing of the original side matrix transformation unit and the inter-bridge phase shift angle; the conduction triggering timing of the wave transmission strategy corresponding to the second bridge arm is determined according to the conduction triggering timing of the first bridge arm and the intra-bridge phase shift angle. When the second bridge arm is a leading bridge arm and the first bridge arm is a lagging bridge arm, the conduction triggering timing of the wave transmission strategy corresponding to the second bridge arm is determined according to the dominant transmission timing of the original side matrix transformation unit and the inter-bridge phase shift angle; the conduction triggering timing of the wave transmission strategy corresponding to the first bridge arm is determined according to the conduction triggering timing of the second bridge arm and the intra-bridge phase shift angle. According to the dominant transmission timing of the primary side matrix transformation unit and the conduction triggering timing of each transmission strategy of the first bridge arm and the second bridge arm, the switching transistors of the primary side matrix transformation unit and the secondary side full bridge transformation unit are synchronously controlled.

8. The method according to any one of claims 1 to 7, characterized in that, The acquisition of the polarity signal of the grid voltage specifically includes: Polarity detection is performed on the input grid voltage; When the mains voltage is detected to be positive, a polarity signal of the first level state is output; when the mains voltage is detected to be negative, a polarity signal of the second level state is output.

9. A control device for an AC / DC converter, characterized in that, The AC / DC converter includes a primary-side matrix converter unit and a secondary-side full-bridge converter unit; the primary-side matrix converter unit and the secondary-side full-bridge converter unit are connected through a high-frequency transformer; it includes: The acquisition module is used to acquire the polarity signal of the mains voltage; The configuration module is used to configure the leading or lagging state of the first and second bridge arms in the secondary full-bridge converter unit according to the polarity signal of the grid voltage. The modulation module is used to synchronously execute an extended phase-shift modulation strategy on the primary-side matrix transformation unit and the secondary-side full-bridge transformation unit based on the leading or lagging states of the first and second bridge arms.

10. An electronic device, characterized in that, include: Memory, processor; The memory stores computer-executed instructions; The processor executes computer execution instructions stored in the memory, causing the processor to perform the method as described in any one of claims 1-8.

11. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, are used to implement the method as described in any one of claims 1-8.

12. A computer program product, characterized in that, Includes a computer program that, when executed by a processor, implements the method described in any one of claims 1-8.

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