Phase-shift modulation method, module, system and storage medium

Abstract

The present invention discloses a phase-shift modulation method, module, system, and storage medium, relating to the technical field of DC converters. The method comprises: obtaining the phase-shift angle of the current calculation cycle and the phase-shift angle of the previous calculation cycle, and calculating the phase-shift angle difference; obtaining the initial carrier count value peak value and the initial modulation wave count value of the first chopping unit when the first chopping unit is used as the reference chopping unit; adjusting the initial carrier count value peak value and the initial modulation wave count value according to the phase-shift angle difference, respectively, to obtain the target carrier count value and the target modulation wave count value of the second chopping unit in the current calculation cycle; and determining the target drive signal of the second chopping unit based on the target carrier count value and the target modulation wave count value. The present invention solves the problems of slow dynamic response speed and large DC offset of inductor current in the dynamic process of DC converters in the prior art, and achieves the technical effect of improving the dynamic response speed of the DC converter.

Description

Technical Field

[0001] The present invention relates to the technical field of direct current converters, and in particular to a phase-shift modulation method, module, system and storage medium. Background Art

[0002] A DC-DC converter is a power electronic device that converts one DC voltage into another with different output characteristics. Dual-active full-bridge converters (DAB converters), commonly used in applications such as AC / DC microgrids, solid-state transformers, electric vehicles, and energy storage, have garnered increasing attention and research due to their advantages, including bidirectional power transmission, electrical isolation, high-side-ratio buck-boost capability, and ease of soft-switching control.

[0003] In related technologies, DAB converters using traditional phase-shift modulation methods experience a DC offset in the inductor current when a disturbance occurs and the phase-shift angle suddenly changes, resulting in large spikes in the transient process. This can easily increase the transient regulation time and affect the dynamic response speed of the DAB converter. Summary of the Invention

[0004] The main purpose of the present invention is to provide a phase shift modulation method, module, system and storage medium, aiming to solve the technical problem of slow dynamic response speed of DC converters in the prior art.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] In a first aspect, the present invention provides a phase shift modulation method applied to a converter, wherein the converter includes a first chopping unit and a second chopping unit, and the method includes:

[0007] Obtain the phase shift angle of the current calculation cycle and the phase shift angle of the previous calculation cycle;

[0008] Obtaining a phase shift angle difference according to the phase shift angle of the current calculation cycle and the phase shift angle of the previous calculation cycle;

[0009] In the case where the first chopping unit is used as a reference chopping unit, obtaining an initial carrier count value peak value and an initial modulation wave count value of the first chopping unit;

[0010] Adjusting the peak value of the initial carrier count value according to the phase shift angle difference to obtain a target carrier count value of the second chopping unit in the current calculation cycle;

[0011] Obtaining a preset drive signal duty cycle of the converter;

[0012] Adjusting the initial modulation wave count value according to the phase shift angle difference and the preset drive signal duty cycle to obtain a target modulation wave count value of the second chopping unit in the current calculation cycle;

[0013] Based on the target carrier count value and the target modulation wave count value, a target driving signal of the second chopping unit in the current calculation cycle is determined; wherein the driving signal of the first chopping unit remains unchanged.

[0014] Optionally, in the above phase shift modulation method, the step of obtaining the phase shift angle of the current calculation cycle and the phase shift angle of the previous calculation cycle includes:

[0015] obtaining an output voltage of the converter;

[0016] Obtaining a voltage difference according to the output voltage and a preset reference voltage;

[0017] Performing PI regulation on the voltage difference to obtain a phase shift angle of the current calculation cycle;

[0018] Obtaining the phase shift angle of the previous calculation cycle from a preset register;

[0019] The phase shift angle stored in the preset register is updated to the phase shift angle of the current calculation cycle.

[0020] Optionally, in the above phase-shift modulation method, after the step of obtaining the peak value of the initial carrier count value and the initial modulation wave count value of the first chopping unit, the method further includes:

[0021] The phase shift angle difference is calibrated according to the peak value of the initial carrier count value to obtain a calibrated count value; wherein the calibrated count value is used to represent the count value of the phase shift angle difference when the peak value of the initial carrier count value is used as a reference value.

[0022] Optionally, in the above-mentioned phase shift modulation method, the step of adjusting the peak value of the initial carrier count value according to the phase shift angle difference to obtain the target carrier count value of the second chopping unit in the current calculation cycle includes:

[0023] Adjusting the peak value of the initial carrier count value according to the calibration count value to obtain an adjusted peak value of the carrier count value;

[0024] A target carrier count value of the second chopping unit in the current calculation cycle is generated according to the adjusted carrier count value peak value.

[0025] Optionally, in the above-mentioned phase-shift modulation method, the step of adjusting the initial modulation wave count value according to the phase-shift angle difference and the preset drive signal duty cycle to obtain the target modulation wave count value of the second chopping unit in the current calculation period includes:

[0026] The initial modulation wave count value is adjusted according to the calibration count value and the preset driving signal duty cycle to obtain a target modulation wave count value of the second chopping unit in the current calculation cycle.

[0027] Optionally, in the above phase-shift modulation method, the step of determining the target driving signal of the second chopping unit in the current calculation cycle based on the target carrier count value and the target modulation wave count value includes:

[0028] Comparing the target carrier count value and the target modulation wave count value to obtain a first drive signal; wherein the portion of the target carrier count value that is greater than the target modulation wave count value corresponds to a high level in the first drive signal, and the portion of the target carrier count value that is less than the target modulation wave count value corresponds to a low level in the first drive signal;

[0029] Adding a dead zone to the first driving signal to obtain a second driving signal;

[0030] The second driving signal is used as the target driving signal.

[0031] Optionally, in the above phase-shift modulation method, the first chopping unit includes the primary side of the converter or the secondary side of the converter;

[0032] After the step of determining the target drive signal of the second chopping unit in the current calculation cycle based on the target carrier count value and the target modulation wave count value, the method further includes:

[0033] sending the target drive signal to the second chopping unit;

[0034] The initial driving signal of the first chopping unit is sent to the first chopping unit as the driving signal of the first chopping unit in the current calculation cycle.

[0035] In a second aspect, the present invention provides a phase-shift modulation module applied to a converter, wherein the converter includes a first chopping unit and a second chopping unit, and the module includes:

[0036] An adjustment unit, used to determine the phase shift angle of the current calculation cycle and store the phase shift angle of the previous calculation cycle;

[0037] a processing unit connected to the adjustment unit, configured to output a phase shift angle difference according to the phase shift angle of the current calculation cycle and the phase shift angle of the previous calculation cycle;

[0038] a carrier frequency conversion phase shift controller connected to the processing unit, configured to obtain, with the first chopping unit as a reference chopping unit, an initial carrier count value peak of the first chopping unit, and adjust the initial carrier count value peak according to the phase shift angle difference to obtain a target carrier count value of the second chopping unit in the current calculation cycle;

[0039] a modulation wave controller connected to the processing unit, configured to obtain an initial modulation wave count value of the first chopping unit and a preset drive signal duty cycle of the converter when the first chopping unit is used as a reference chopping unit, and adjust the initial modulation wave count value according to the phase shift angle difference and the preset drive signal duty cycle to obtain a target modulation wave count value of the second chopping unit in the current calculation cycle; and

[0040] A driving signal modulation unit is connected to the carrier frequency conversion phase shift controller and the modulation wave controller, respectively, and is used to determine the target driving signal of the second chopping unit in the current calculation cycle based on the target carrier count value and the target modulation wave count value; and use the initial driving signal of the first chopping unit as the driving signal of the first chopping unit in the current calculation cycle.

[0041] In a third aspect, the present invention provides a phase shift modulation system, the system comprising:

[0042] a converter, configured to perform voltage conversion on a received input voltage, the converter comprising a first chopping unit and a second chopping unit; and

[0043] The phase-shift modulation module is used to perform phase-shift control on the converter using the phase-shift modulation method as described above.

[0044] In a fourth aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by one or more processors, the phase-shift modulation method as described above is implemented.

[0045] The above one or more technical solutions provided by the present invention may have the following advantages or at least achieve the following technical effects:

[0046] The present invention proposes a phase-shift modulation method, module, system, and storage medium. The method is applied to a converter including a first chopping unit and a second chopping unit. By calculating the phase-shift angle difference, when the first chopping unit is used as the reference chopping unit, the peak value of the initial carrier count value of the first chopping unit is adjusted according to the phase-shift angle difference to obtain the target carrier count value of the second chopping unit. The initial modulation wave count value of the first chopping unit is adjusted according to the phase-shift angle difference and the preset drive signal duty cycle of the converter to obtain the target modulation wave count value of the second chopping unit. Then, based on the target carrier count value and the target modulation wave count value, the target carrier count value of the second chopping unit is determined. The target driving signal of the first chopping unit is maintained unchanged, thereby realizing phase-shift modulation control between the first chopping unit and the second chopping unit. When a disturbance occurs to the converter and the phase-shift angle suddenly changes, the present invention performs phase-shift modulation according to the calculated phase-shift angle difference, compared with a method of directly performing phase-shift modulation according to the phase-shift angle of the current calculation cycle. This modulation strategy does not require adding an additional load, thereby reducing the DC offset of the inductor current. Moreover, under the premise of ensuring that the duty cycle of the driving signal remains unchanged, the carrier count value and the modulation wave count value are adjusted, thereby reducing the transient inductor current stress, thereby improving the dynamic response speed of the converter. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these provided drawings without paying any creative work.

[0048] Figure 1 Schematic diagram of the flow of the first embodiment of the phase shift modulation method of the present invention;

[0049] Figure 2 A connection diagram of a phase shift modulation system according to the present invention;

[0050] Figure 3 for Figure 2 Schematic diagram of the connection of the converter;

[0051] Figure 4 This is a hardware topology diagram of the converter in the first embodiment of the phase-shift modulation method of the present invention;

[0052] Figure 5 for Figure 2 Connection diagram of the phase shift modulation module;

[0053] Figure 6 This is a hardware topology diagram of the phase-shift modulation module in the first embodiment of the phase-shift modulation method of the present invention;

[0054] Figure 7 This is a phase shift example diagram of comparative example 1 in the first embodiment of the phase shift modulation method of the present invention;

[0055] Figure 8 This is a phase shift example diagram of comparative example 2 in the first embodiment of the phase shift modulation method of the present invention;

[0056] Figure 9 This is a flowchart of the first embodiment of the phase shift modulation module of the present invention;

[0057] Figure 10 FIG. 1 is a connection diagram of the first embodiment of the phase-shift modulation system of the present invention.

[0058] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0059] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0060] It should be noted that, in the present invention, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "include..." does not exclude the existence of other identical elements in the process, method, article or system including the element. In addition, in the present invention, unless otherwise clearly specified and defined, the terms "connect", "fixed" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements.

[0061] In the present invention, if there are descriptions involving "first," "second," etc., such descriptions are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the present invention, the use of suffixes such as "module," "component," or "unit" to indicate elements is merely to facilitate the description of the present invention and does not have any specific meaning in itself. Therefore, "module," "component," or "unit" may be used interchangeably.

[0062] Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances. Furthermore, the technical solutions of the various embodiments may be combined with each other, but this must be based on the fact that they can be implemented by those skilled in the art. If the combination of technical solutions is mutually inconsistent or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0063] An analysis of existing technologies reveals that numerous control methods exist for achieving phase-shift control and efficiency optimization in DC-DC converters. However, DAB converters also require high dynamic response performance in practical applications. Currently, strategies for improving the dynamic response of DAB converters primarily include model prediction, feedforward control, and direct power control. However, few innovative dynamic response improvement strategies specifically address the implementation of phase-shift modulation have been developed.

[0064] DAB converters using traditional phase-shift modulation have poor dynamic response performance. Taking a single-phase-shift (SPS) DAB converter as an example, the specific implementation of phase-shift modulation is as follows: In a digital microprocessor, the triangular carrier wave of one bridge arm is fixed as a reference. The phase of the triangular carrier wave of the other bridge arms is shifted according to the current phase-shift angle. The modulated wave of each bridge arm is then compared with the triangular carrier wave. After adding a dead zone, a complementary PWM (Pulse Width Modulation) wave is generated. When a disturbance occurs in this DAB converter and the phase-shift angle changes suddenly, the inductor current will generate a DC offset, resulting in a large transient spike. Due to the line impedance R, although the DC offset gradually decreases to zero after a certain period of time, the smaller the line impedance R, the longer the transient adjustment time. Therefore, the DC offset affects the dynamic response speed of the DAB converter.

[0065] In view of the technical problems of slow dynamic response speed and large DC offset of inductor current in the dynamic process in the existing DC converter, the present invention provides a phase shift modulation method applied to a converter including a first chopping unit and a second chopping unit. The overall concept is as follows:

[0066] Obtain the phase shift angle of the current calculation cycle and the phase shift angle of the previous calculation cycle; obtain the phase shift angle difference according to the phase shift angle of the current calculation cycle and the phase shift angle of the previous calculation cycle; when the first chopping unit is used as the reference chopping unit, obtain the initial carrier count value peak value and the initial modulation wave count value of the first chopping unit; adjust the initial carrier count value peak value according to the phase shift angle difference to obtain the target carrier count value of the second chopping unit in the current calculation cycle; obtain the preset drive signal duty cycle of the converter; adjust the initial modulation wave count value according to the phase shift angle difference and the preset drive signal duty cycle to obtain the target modulation wave count value of the second chopping unit in the current calculation cycle; determine the target drive signal of the second chopping unit in the current calculation cycle based on the target carrier count value and the target modulation wave count value; wherein the drive signal of the first chopping unit remains unchanged.

[0067] Through the above technical solution, phase-shift modulation control between the first chopping unit and the second chopping unit is realized. When a disturbance occurs in the converter and the phase-shift angle suddenly changes, compared with a method of directly performing phase-shift modulation according to the phase-shift angle of the current calculation cycle, performing phase-shift modulation according to the calculated phase-shift angle difference does not require adding an additional load modulation strategy, thereby reducing the DC offset of the inductor current. Moreover, under the premise of ensuring that the duty cycle of the drive signal remains unchanged, the carrier count value and the modulation wave count value are adjusted to reduce the transient inductor current stress, thereby improving the dynamic response speed of the converter.

[0068] The phase shift modulation method, module, system and storage medium provided by the present invention are described in detail below with reference to specific embodiments and implementation modes in conjunction with the accompanying drawings.

[0069] Example 1

[0070] Reference Figure 1 A flow chart of the present invention is provided, which proposes a first embodiment of the phase-shift modulation method of the present invention, and the phase-shift modulation method is applied to a phase-shift modulation system.

[0071] like Figure 2 FIG. 1 is a connection diagram of a phase shift modulation system, which may include:

[0072] The converter 1000 is configured to convert the received input voltage into an output voltage; and

[0073] The phase-shift modulation module 2000 is configured to perform phase-shift control on the converter 1000 using a phase-shift modulation method according to the output voltage.

[0074] The converter 1000 may be a transformer device capable of realizing voltage transmission and voltage conversion. The transformer device may be an integrated module, integrated chip, etc. connected to the phase-shift modulation module 2000, or an independent terminal device, embedded device, etc.; similarly, the phase-shift modulation module 2000 may be a control device capable of realizing signal transmission and signal processing. The control device may be an integrated module, integrated chip, etc. connected to the converter 1000, or an independent terminal device, embedded device, etc.

[0075] like Figure 3 FIG. 1 is a connection diagram of a converter 1000 . The converter 1000 may be any converter using a PWM phase-shift modulation strategy. The converter 1000 may include:

[0076] The input unit 1001 , the first chopping unit 1002 , the voltage transformation unit 1003 , the second chopping unit 1004 and the output unit 1005 are connected in sequence; wherein the first chopping unit 1002 , the second chopping unit 1004 and the output unit 1005 are all connected to the phase shift modulation module 2000 .

[0077] An external power supply or other external device sends direct current to the converter 1000. The input unit 1001 of the converter 1000 receives the input voltage in the form of direct current and sends it to the first chopping unit 1002. The first chopping unit 1002 chops the input voltage into a square wave according to the drive signal (PWM signal) output by the phase-shift modulation module 2000 and sends it to the transformer unit 1003. The transformer unit 1003 transfers energy to the second chopping unit 1004 through the windings on both sides. The second chopping unit 1004 rectifies the received energy into an output voltage in the form of direct current according to the drive signal (PWM signal) output by the phase-shift modulation module 2000, and outputs it to the load or other electrical equipment through the output unit 1005.

[0078] In this embodiment, the converter 1000 specifically adopts a dual active full bridge converter (DAB converter), such as Figure 4, which is a hardware topology diagram of the converter 1000 in this embodiment. The input unit 1001 receives the input voltage V1, and the first chopping unit 1002 can be an H-bridge chopping circuit, including four switch tubes Q1, Q2, Q3, and Q4. The drain of Q1 and the drain of Q3 are both connected to the positive output terminal of the input unit 1001, the source of Q1 is respectively connected to the drain of Q2 and the positive input terminal of the transformer unit 1003, the source of Q3 is respectively connected to the drain of Q4 and the negative input terminal of the transformer unit 1003, and the drain of Q2 is respectively connected to the negative input terminal of the transformer unit 1003. The source of Q1 and the source of Q4 are connected to the negative output terminal of the input unit 1001, and the gates of Q1, Q2, Q3 and Q4 are connected to the phase-shift modulation module 2000, that is, the control terminals of Q1 to Q4 are connected to the phase-shift modulation module 2000; the voltage transformation unit 1003 includes an inductor L and a transformer T1, one end of the inductor L is connected to the common point A of the source of Q1 and the drain of Q2, and the other end of the inductor L is connected to the common point A of the source of Q1 and the drain of Q2, and the other end of the inductor L is connected to the common point A of the transformer T1. The first end of the transformer T1 is connected to the first end of the transformer T1, the second end of the transformer T1 is connected to the common point B of the source of Q3 and the drain of Q4, and the third and fourth ends of the transformer T1 are both connected to the second chopping unit 1004; the second chopping unit 1004 includes four switching tubes Q5, Q6, Q7 and Q8, the drain of Q5 and the drain of Q7 are both connected to the output unit 1005, the common point C of the source of Q5 and the drain of Q6 are connected to the third end of the transformer T1, the common point D of the source of Q7 and the drain of Q8 are connected to the fourth end of the transformer T1, the source of Q6 and the source of Q8 are both connected to the output unit 1005, and the gates of Q5, Q6, Q7 and Q8 are all connected to the phase-shift modulation module 2000, that is, the control ends of Q5 to Q8 are all connected to the phase-shift modulation module 2000; the output unit 1005 outputs the output voltage V2 to the load and also outputs it to the phase-shift modulation module 2000. The switch tubes Q1 to Q8 may be IGBTs (Insulated Gate Bipolar Transistors) or MOSFETs (Metallic Oxide Semiconductor Field Effect Transistors).

[0079] Phase-shift modulation module 2000 performs phase-shift control on converter 1000, specifically by controlling first chopping unit 1002 and second chopping unit 1004 of converter 1000. Phase-shift modulation module 2000 can be a control device including a processor and a memory, or a modular device comprising multiple units connected to implement the phase-shift modulation method.

[0080] like Figure 5 FIG. 2 is a connection diagram of a phase-shift modulation module 2000. The phase-shift modulation module 2000 may include:

[0081] An adjusting unit 2001, a processing unit 2002, a carrier frequency conversion phase shift controller 2003, a modulation wave controller 2004 and a driving signal modulation unit 2005; wherein, the input end of the adjusting unit 2001 is connected to the output unit 1005 of the converter 1000, the input end of the processing unit 2002 is connected to the output end of the adjusting unit 2001, the input end of the carrier frequency conversion phase shift controller 2003 is connected to the output end of the processing unit 2002, the input end of the modulation wave controller 2004 is connected to the output end of the processing unit 2002, the input end of the driving signal modulation unit 2005 is respectively connected to the output end of the carrier frequency conversion phase shift controller 2003 and the output end of the modulation wave controller 2004, and the output end of the driving signal modulation unit 2005 is connected to the first chopping unit 1002 and the second chopping unit 1004 of the converter 1000.

[0082] In this embodiment, based on Figure 4 The hardware topology diagram of the converter 1000 shown in FIG. Figure 6 The hardware topology diagram of the phase shift modulation module 2000 in this embodiment is shown.

[0083] Based on the above phase shift modulation system, the following Figures 1 to 6 , the phase shift modulation method of this embodiment is described in detail. The method may include the following steps:

[0084] Step S100: obtaining the phase shift angle of the current calculation cycle and the phase shift angle of the previous calculation cycle.

[0085] Specifically, the calculation period can be set according to the voltage loop calculation period Ts, for example, different calculation periods can be set according to different beats of the voltage loop calculation period Ts. When it is necessary to perform phase shift modulation on the drive signal received by the first chopper unit and the drive signal received by the second chopper unit of the converter, the current beat of the voltage loop calculation period Ts is the current calculation period.

[0086] The adjustment unit 2001 obtains the phase shift angle of the current calculation cycle, specifically by sampling the output voltage V2 and comparing it with the preset reference voltage to calculate the current beat of the voltage loop calculation cycle Ts. 0 The phase shift angle of the current calculation cycle is obtained. The adjustment unit 2001 obtains the phase shift angle of the previous calculation cycle, which can be specifically obtained by calling the previous beat z of the voltage loop calculation cycle Ts stored. -1 The phase shift angle of the previous calculation cycle is obtained.

[0087] In one embodiment, step S100 may include:

[0088] Step S110: obtaining the output voltage of the converter;

[0089] Step S120: obtaining a voltage difference according to the output voltage and a preset reference voltage;

[0090] Step S130: performing PI regulation on the voltage difference to obtain a phase shift angle of a current calculation cycle.

[0091] In this embodiment, Figure 3 and Figure 4 As shown, the converter 1000 converts the input voltage V1, and the output unit 1005 outputs the converted voltage, that is, the output voltage V2; Figure 6 As shown, the regulating unit 2001 includes a digital PI regulator. The regulating unit 2001 first obtains the output voltage V2. Specifically, the voltage value can be collected through an AD sampling circuit or an AD sampling chip, which is not shown in the figure; then, the difference between the output voltage V2 and the preset reference voltage Vref is calculated through an operator or a subtractor to obtain a voltage difference; then, the voltage difference is input into the digital PI regulator, and the digital PI regulator performs PI regulation on the voltage difference to obtain the current beat of the voltage loop operation period Ts. 0 The phase shift angle of the current calculation cycle is obtained.

[0092] Step S140: Obtain the phase shift angle of the previous calculation cycle from a preset register.

[0093] In this embodiment, the adjustment unit 2001 further includes at least one register, which can be set in advance to store phase shift angle data of a calculation cycle duration or a set storage duration by setting a certain register, namely, a preset register. The amount of phase shift angle data that can be stored in the register can also be set. For example, in this embodiment, it can be set to store only one phase shift angle data, which can avoid storing too much phase shift angle data and failing to obtain the required phase shift angle of the previous calculation cycle in a timely manner.

[0094] like Figure 6 As shown, when the adjustment unit 2001 calculates the phase shift angle θ(n) of the current calculation cycle, it can also call the previous beat z of the voltage loop calculation cycle Ts stored in the preset register. -1 The phase shift angle of the previous calculation cycle is obtained.

[0095] Step S150: updating the phase shift angle stored in the preset register to the phase shift angle of the current calculation cycle.

[0096] In this embodiment, after the phase shift angle θ(n-1) of the previous calculation cycle is obtained in step S140, the phase shift angle data stored in the register may be updated based on the phase shift angle θ(n) of the current calculation cycle calculated in step S130. Because the preset register in this embodiment stores only one phase shift angle data, the phase shift angle stored in the preset register is directly updated to the phase shift angle θ(n) of the current calculation cycle, so that it can be used as the phase shift angle of the previous calculation cycle when needed in the next calculation cycle.

[0097] Step S200: Obtaining a phase shift angle difference according to the phase shift angle of the current calculation cycle and the phase shift angle of the previous calculation cycle.

[0098] Specifically, the phase shift angle of the current calculation cycle can be subtracted from the phase shift angle of the previous calculation cycle to obtain the phase shift angle difference, which represents the change in the phase shift angle. Figure 6 As shown, in the processing unit 2002, the phase shift angle difference can be calculated by a subtractor or an operator.

[0099] In this embodiment, the phase shift angle θ(n) of the current calculation cycle is subtracted from the phase shift angle θ(n-1) of the previous calculation cycle to obtain the phase shift angle difference Δθ=θ(n)-θ(n-1); then the obtained phase shift angle difference Δθ can be sent to the carrier frequency conversion phase shift controller 2003 and the modulation wave controller 2004 respectively.

[0100] Step S300: When the first chopping unit is used as a reference chopping unit, an initial carrier count value peak value and an initial modulation wave count value of the first chopping unit are obtained.

[0101] When the first chopping unit 1002 of the converter 1000 is used as a reference chopping unit and the driving signal received by the second chopping unit 1004 needs to be phase-shifted and modulated, the initial carrier count value peak of the first chopping unit 1002 can be obtained through the carrier frequency conversion phase shift controller 2003, and the initial modulation wave count value of the first chopping unit 1002 can be obtained through the modulation wave controller 2004 for subsequent use.

[0102] It should be noted that the first chopping unit in step S300 can be the chopping unit on the primary side of the transformer unit 1003, and the second chopping unit can be the chopping unit on the secondary side of the transformer unit 1003; or it can be the chopping unit on the secondary side of the transformer unit 1003, and the second chopping unit can be the chopping unit on the primary side of the transformer unit 1003. Figure 3 As shown, this embodiment is described by taking the first chopping unit 1002 as the chopping unit on the primary side of the transformer unit 1003 and the second chopping unit 1004 as the chopping unit on the secondary side of the transformer unit 1003 as an example.

[0103] In one embodiment, step S300 may further include:

[0104] Step S310: Calibrate the phase shift angle difference according to the peak value of the initial carrier count value to obtain a calibrated count value; wherein the calibrated count value is used to represent the count value of the phase shift angle difference when the peak value of the initial carrier count value is used as a reference value.

[0105] Specifically, since signal modulation will be performed based on the carrier count value or the modulation wave count value in the future, in order to facilitate subsequent calculations, the phase shift angle difference can be calibrated according to the triangular carrier count value.

[0106] In this embodiment, the phase shift angle difference Δθ is calibrated according to the peak value of the initial carrier count value of the first chopping unit 1002 and converted into a count value associated with the peak value of the initial carrier count value to obtain a calibrated count value.

[0107] Step S400: adjusting the peak value of the initial carrier count value according to the phase shift angle difference to obtain the target carrier count value of the second chopping unit in the current calculation cycle.

[0108] Specifically, the triangular carrier has a peak value in each voltage loop operation cycle. When the second chopping unit 1004 is phase-shift modulated, the first chopping unit 1002 does not need phase-shift modulation. The triangular carrier of the first chopping unit has an initial carrier count value peak value F1. In this embodiment, Figure 6 As shown, the phase shift modulation module 2000 can specifically adjust the initial carrier count value peak F1 according to the phase shift angle difference Δθ to obtain the adjusted carrier count value peak and generate the corresponding carrier count value, that is, the target carrier count value.

[0109] In this embodiment, Figure 6 As shown, the initial carrier count value peak value F1 can be adjusted according to the phase shift angle difference Δθ by the carrier frequency conversion phase shift controller 2003. For the DAB converter of this embodiment, the triangular carrier of the second chopping unit 1004 is adjusted at a fixed position of the triangular carrier, taking the triangular carrier of the first chopping unit 1002 as a reference. Therefore, after the adjustment, the target carrier count value of the second chopping unit in the current calculation cycle can be obtained.

[0110] In one embodiment, step 400 may include:

[0111] Step 410: adjusting the peak value of the initial carrier count value according to the calibration count value to obtain an adjusted peak value of the carrier count value;

[0112] Step 420: Generate a target carrier count value of the second chopping unit in the current calculation cycle according to the adjusted carrier count value peak value.

[0113] Specifically, in step S310, the count value of the calibrated phase shift angle difference is obtained, that is, after the calibrated count value, the peak value of the initial carrier count value is adjusted according to the phase shift angle difference. Specifically, the peak value of the initial carrier count value is adjusted according to the calibrated count value. When adjusting, the adjustment can be made according to a preset adjustment ratio, a preset adjustment relationship or a preset relationship table, etc. For example, according to the positive and negative relationship and the specific value of the calibrated count value, the peak value of the initial carrier count value is correspondingly increased or decreased by a corresponding value.

[0114] In this embodiment, when adjusting the peak value of the initial carrier count value, half of the calibration count value is added to the peak value of the initial carrier count value to obtain the adjusted peak value of the carrier count value; when the calibration count value is a positive number, the adjusted peak value of the carrier count value will be larger than the peak value of the initial carrier count value, specifically, larger by half of the absolute value of the calibration count value; when the calibration count value is a negative number, the adjusted peak value of the carrier count value will be smaller than the peak value of the initial carrier count value, specifically, smaller by half of the absolute value of the calibration count value. For example, assuming that the initial carrier count value peak F1 is 500 and the obtained calibration count value Δθ is +200, then the adjusted carrier count value peak F2 = 500 + 200 / 2 = 600 can be obtained. For another example, assuming that the initial carrier count value peak F1 is 500 and the obtained calibration count value Δθ is -200, then the adjusted carrier count value peak F2 = 500 - 200 / 2 = 400 can be obtained; then, according to the adjusted carrier count value peak F2, the corresponding target carrier count value of the second chopping unit in the current calculation cycle is generated and sent to the operator for subsequent calculation.

[0115] Step S500: obtaining a preset duty cycle of a driving signal of the converter.

[0116] Specifically, when the first chopping unit is used as the reference chopping unit, when obtaining the initial modulation wave count value of the first chopping unit, the preset drive signal duty cycle of the converter can also be obtained to adjust the initial modulation wave count value while ensuring that the duty cycle remains unchanged.

[0117] In this embodiment, the preset duty cycle of the driving signal of the converter 1000 is obtained by the modulation wave controller 2004 for subsequent use.

[0118] Step S600: adjusting the initial modulation wave count value according to the phase shift angle difference and the preset driving signal duty cycle to obtain a target modulation wave count value of the second chopping unit in the current calculation period.

[0119] Specifically, while adjusting the peak value of the initial carrier count based on the phase-shift angle difference, the initial modulation wave count is also adjusted based on the phase-shift angle difference, while ensuring that the preset duty cycle of the converter's drive signal remains unchanged, to obtain the target modulation wave count. Compared to the related art method of performing phase-shift modulation by changing the duty cycle, this method avoids the problem of large transient spikes caused by changing the duty cycle.

[0120] In this embodiment, Figure 6 As shown, the initial modulation wave count value can be adjusted according to the phase shift angle difference Δθ by the modulation wave controller 2004. For the DAB converter of this embodiment, the modulation wave size of the second chopping unit 1004 is adjusted based on the modulation wave size of the first chopping unit 1002. Therefore, after the adjustment, the target modulation wave count value of the second chopping unit in the current calculation cycle can be obtained.

[0121] In one embodiment, step S600 may include:

[0122] Step S610: adjusting the initial modulation wave count value according to the calibration count value and the preset driving signal duty cycle to obtain a target modulation wave count value of the second chopping unit in the current calculation cycle.

[0123] Specifically, after obtaining the count value of the calibrated phase shift angle difference in step S310, that is, the calibrated count value, the initial modulation wave count value can also be adjusted according to the calibrated count value and the preset drive signal duty cycle. The adjustment can be made according to a preset adjustment ratio, a preset adjustment relationship or a preset relationship table, etc. For example, according to the positive and negative relationship and the specific value of the calibrated count value, the initial modulation wave count value can be increased or decreased by a corresponding value.

[0124] In this embodiment, when the initial modulation wave count value is adjusted, the product of half of the calibration count value and the preset drive signal duty cycle is obtained, and then the product is added to the initial modulation wave count value to obtain the adjusted modulation wave count value, that is, the target modulation wave count value; when the calibration count value is a positive number, the target modulation wave count value will be larger than the initial modulation wave count value, specifically the product of the larger calibration count value and the preset value, and the preset value can be set according to the preset drive signal duty cycle; when the calibration count value is a negative number, the target modulation wave count value will be smaller than the initial modulation wave count value, specifically the product of the smaller calibration count value and the preset value. For example, assuming that the initial modulation wave count value H1 is 250, the preset drive signal duty cycle D is 50%, the preset value is set to 0.25, and the obtained calibration count value Δθ is +200, then the target modulation wave count value H2 = 250 + 200 * 0.25 = 300 can be obtained. For another example, assuming that the initial modulation wave count value H1 is 300, the preset drive signal duty cycle D is 50%, the preset value is set to 0.25, and the obtained calibration count value Δθ is -200, then the target modulation wave count value H2 = 250 - 200 * 0.25 = 200 can be obtained. Afterwards, the obtained target modulation wave count value H2 can be directly sent to the operator for subsequent calculations.

[0125] Step S700: determining a target driving signal of the second chopping unit in the current calculation cycle based on the target carrier count value and the target modulation wave count value; wherein the driving signal of the first chopping unit remains unchanged.

[0126] Specifically, after obtaining the target carrier count value and the target modulation wave count value according to the phase shift angle difference, the target carrier count value and the target modulation wave count value can be compared, and after adding the dead zone, the PWM signal can be obtained.

[0127] In this embodiment, Figure 6 As shown, the PWM signal can be obtained by comparison through the driving signal modulation unit 2005. For the DAB converter of this embodiment, the triangular carrier of the first chopping unit 1002 is used as a reference, and the triangular carrier of the second chopping unit 1004 is adjusted in real time to obtain the target carrier count value, and the modulation wave size of the first chopping unit 1002 is used as a reference to synchronously adjust the modulation wave size of the second chopping unit 1004 to obtain the target modulation wave count value. The target carrier count value of the second chopping unit 1004 is compared with the target modulation wave count value, and a dead zone is added to obtain the PWM signal of the DAB converter. The PWM signal is the control signal for controlling the second chopping unit 1004 to perform phase shift modulation, that is, the target driving signal. It should be noted that for the DAB converter of this embodiment, Figure 4 and Figure 6In the hardware topology shown, the first chopping unit 1002 is used as the reference chopping unit to perform phase-shift modulation on the second chopping unit 1004, and specifically, the obtained PWM2 signal is sent to the control ends of the switches Q5 to Q8 in the second chopping unit 1004. In actual applications, the second chopping unit 1004 can also be used as the reference chopping unit to perform phase-shift modulation on the first chopping unit 1002, and specifically, the obtained PWM1 signal is sent to the control ends of the switches Q1 to Q4 in the first chopping unit 1002, thereby achieving the purpose of phase-shift modulation control of the converter 1000 by the phase-shift modulation module 2000, and realizing phase-shift modulation of transient frequency conversion.

[0128] In one embodiment, step S700 may include:

[0129] Step S710: Compare the target carrier count value and the target modulation wave count value to obtain a first driving signal.

[0130] The portion where the target carrier count value is greater than the target modulation wave count value corresponds to a high level in the first drive signal, and the portion where the target carrier count value is less than the target modulation wave count value corresponds to a low level in the first drive signal.

[0131] Step S720: adding a dead zone to the first driving signal to obtain a second driving signal;

[0132] Step S730: using the second driving signal as the target driving signal.

[0133] Specifically, after obtaining the target carrier count value and the target modulation wave count value, the first drive signal and the size of the dead zone to be added are compared, the dead zone is added to the first drive signal accordingly, and a second drive signal in the form of a PWM signal is generated. The second drive signal can be used as the target drive signal.

[0134] In another embodiment, the first chopping unit includes a primary side of the converter or a secondary side of the converter; and the method may further include:

[0135] Step S800: sending the target drive signal to the second chopping unit;

[0136] Step S900: sending the initial driving signal of the first chopping unit as the driving signal of the first chopping unit in the current calculation cycle to the first chopping unit.

[0137] Specifically, in the converter 1000, the first chopping unit can be a chopping unit on the primary side of the transformer unit 1003, or a chopping unit on the secondary side. After obtaining the target drive signal, the target drive signal can be sent to the chopping unit on the corresponding opposite side, i.e., the second chopping unit. The specific setting is based on the actual situation, for example, Figure 3 As shown, when the secondary side is phase-shifted and modulated according to the signal on the primary side of the transformer unit 1003, the PWM signal is sent to the second chopping unit 1004; when the primary side is phase-shifted and modulated according to the signal on the secondary side of the transformer unit 1003, the PWM signal is sent to the first chopping unit 1002.

[0138] The phase-shift modulation method of this embodiment realizes phase-shift modulation by means of transient frequency conversion. The implementation method is simple and the frequency conversion phase shift can be completed in one switching cycle. It can also reduce the DC offset and current stress of the inductor current caused by the sudden change of the phase shift angle, thereby effectively improving the dynamic response speed of the converter.

[0139] To further illustrate the effect of the phase-shift modulation method of this embodiment, phase-shift modulation is performed on a DAB converter using a conventional phase-shift modulation method in the prior art and the phase-shift modulation method of this embodiment, and the effects are compared.

[0140] Comparative Example 1: Traditional phase shift modulation method Figure 4 The DAB converter shown in FIG. 1 performs phase shift modulation, specifically, the first chopping unit 1002 in the primary side of the transformer unit 1003 performs phase shift modulation on the second chopping unit 1004 in the secondary side, and the following is obtained: Figure 7 The phase shift example diagram shown is Figure 7 From top to bottom, the triangle carrier signal of the first chopping unit 1002, the triangle carrier signal of the second chopping unit 1004, the PWM signal received by the first chopping unit 1002 from the phase-shift modulation module 2000, the PWM signal received by the second chopping unit 1004 from the phase-shift modulation module 2000, and the current I of the inductor L are respectively represented. L The change curve diagram of Figure 7 It can be seen that the driving signal of the first chopping unit 1002 is directly phase-shifted on the driving signal of the second chopping unit 1004. The initial value of the carrier count value at the phase-shift moment is consistent with the triangular carrier signal of the first chopping unit 1002 at the same moment, but in the opposite direction. During the phase shift, the PWM2 signal sent by the phase-shift modulation module 2000 to the switch tubes Q5 and Q8 is high, and the PWM2 signal of the switch tubes Q6 and Q7 is low, and lasts for one and a half cycles T+DT. After the phase shift is completed, the inductor current I L The corresponding changes occur.

[0141] Comparative Example 2: The method of this embodiment is Figure 4The DAB converter shown in FIG. 1 performs phase shift modulation, specifically, the first chopping unit 1002 in the primary side of the transformer unit 1003 performs phase shift modulation on the second chopping unit 1004 in the secondary side, and the following is obtained: Figure 8 The phase shift example diagram shown is Figure 8 From top to bottom, the first chopping unit 1002 receives the triangular carrier signal of the phase-shift modulation module 2000, the second chopping unit 1004 receives the triangular carrier signal of the phase-shift modulation module 2000, the PWM signal of the first chopping unit 1002, the PWM signal of the second chopping unit 1004, and the current I of the inductor L. L The change curve diagram of Figure 8 It can be seen that the driving signal of the first chopping unit 1002 does not change. After the phase shift angle difference Δθ is calculated based on the output voltage V2 output by the output unit 1005, the carrier count value is adjusted. By changing the peak value of the carrier count value within a switching cycle, the frequency conversion phase shift is completed to obtain the target carrier count value. At the same time, the modulation wave count value is also adjusted to obtain the target modulation wave count value. The target driving signal of the second chopping unit in the current calculation cycle can be determined to achieve transient frequency conversion of the second chopping unit 1004, ensuring that the preset driving signal duty cycle is always maintained at 50% during the transient frequency conversion process. After the phase shift is completed, the inductor current I L There are also corresponding changes.

[0142] When a disturbance occurs in the DAB converter, the phase shift angle θ changes suddenly, and the inductor current generates a DC offset. At this time, the transient analysis of the DAB converter can be obtained:

[0143]

[0144] Among them, I Ldc Indicates the inductor current I L The DC offset, Δθ represents the phase shift angle mutation, which is the phase shift angle difference in this embodiment, V2 represents the output voltage, f s Represents the switching frequency, and L represents the leakage inductance of the inductor L. It can be seen from this formula that the larger Δθ is, the greater the DC offset I Ldc When the phase shift angle suddenly changes to 90°, the inductor current I L The generated DC offset I Ldc A large change occurs, and a large peak I Lmax , due to the existence of line impedance R, after a certain period of time, the DC offset I Ldc It will gradually adjust to zero, but the adjustment time is related to the impedance. When the line impedance R is constant, in the comparative example 1, combined with Figure 7 You know, I Lmax and I LdcLarger, correspondingly, the DC offset adjustment time is longer, and the dynamic response speed of the DAB converter will be slower; in comparative example 2, combined with Figure 8 You know, I Lmax and I Ldc Average ratio Figure 7 Correspondingly, the DC offset adjustment time is shortened and the dynamic response speed of the DAB converter is faster.

[0145] The phase-shift modulation method provided in this embodiment is applied to a converter including a first chopping unit and a second chopping unit. By calculating the phase-shift angle difference, when the first chopping unit is used as the reference chopping unit, the peak value of the initial carrier count value of the first chopping unit is adjusted according to the phase-shift angle difference to obtain the target carrier count value of the second chopping unit. The initial modulation wave count value of the first chopping unit is adjusted according to the phase-shift angle difference and the preset drive signal duty cycle of the converter to obtain the target modulation wave count value of the second chopping unit. Then, based on the target carrier count value and the target modulation wave count value, the target drive signal of the second chopping unit is determined. , wherein the driving signal of the first chopping unit remains unchanged, realizing phase-shift modulation control between the first chopping unit and the second chopping unit; when the converter is disturbed and the phase-shift angle suddenly changes, the present invention performs phase-shift modulation according to the calculated phase-shift angle difference, compared with a method of directly performing phase-shift modulation according to the phase-shift angle of the current calculation cycle. This modulation strategy does not require adding an additional load, and can reduce the DC offset of the inductor current; and, under the premise of ensuring that the duty cycle of the driving signal remains unchanged, the carrier count value and the modulation wave count value are adjusted to reduce the transient inductor current stress, thereby improving the dynamic response speed of the converter.

[0146] Example 2

[0147] Based on the same invention concept, Figure 5 and Figure 9 , a first embodiment of the phase-shift modulation module of the present invention is proposed. The phase-shift modulation module can be a virtual device, applied to the control module of the converter, or it can be a hardware device composed of specific hardware connections, applied to the phase-shift modulation system to perform phase-shift modulation on the converter.

[0148] The following combination Figure 5 The connection diagram shown in FIG. 1 is used to describe in detail the phase shift modulation module provided in this embodiment. The device may include:

[0149] An adjustment unit, used to determine the phase shift angle of the current calculation cycle and store the phase shift angle of the previous calculation cycle;

[0150] a processing unit connected to the adjustment unit, configured to output a phase shift angle difference according to the phase shift angle of the current calculation cycle and the phase shift angle of the previous calculation cycle;

[0151] a carrier frequency conversion phase shift controller connected to the processing unit, configured to obtain, with the first chopping unit as a reference chopping unit, an initial carrier count value peak of the first chopping unit, and adjust the initial carrier count value peak according to the phase shift angle difference to obtain a target carrier count value of the second chopping unit in the current calculation cycle;

[0152] a modulation wave controller connected to the processing unit, configured to obtain an initial modulation wave count value of the first chopping unit and a preset drive signal duty cycle of the converter when the first chopping unit is used as a reference chopping unit, and adjust the initial modulation wave count value according to the phase shift angle difference and the preset drive signal duty cycle to obtain a target modulation wave count value of the second chopping unit in the current calculation cycle; and

[0153] A driving signal modulation unit is connected to the carrier frequency conversion phase shift controller and the modulation wave controller, respectively, and is used to determine the target driving signal of the second chopping unit in the current calculation cycle based on the target carrier count value and the target modulation wave count value; and use the initial driving signal of the first chopping unit as the driving signal of the first chopping unit in the current calculation cycle.

[0154] Specifically, the adjustment unit may include:

[0155] A voltage collector, used to obtain the output voltage of the converter;

[0156] a difference operator, configured to obtain a voltage difference based on the output voltage and a preset reference voltage;

[0157] A PI regulator, configured to perform PI regulation on the voltage difference to obtain a phase shift angle of the current calculation cycle;

[0158] A preset register is used to obtain the phase shift angle of the previous calculation cycle; and update the phase shift angle stored in the preset register to the phase shift angle of the current calculation cycle.

[0159] Furthermore, if Figure 9 As shown in the workflow diagram, the module may also include:

[0160] The calibration unit is used to calibrate the phase shift angle difference according to the peak value of the initial carrier count value to obtain a calibrated count value; wherein the calibrated count value is used to represent the count value of the phase shift angle difference when the peak value of the initial carrier count value is used as a reference value.

[0161] Furthermore, the carrier frequency conversion phase shift controller may include:

[0162] a carrier count value peak value operator, configured to adjust the initial carrier count value peak value according to the calibration count value to obtain an adjusted carrier count value peak value;

[0163] The carrier count value generator is used to generate a target carrier count value of the second chopping unit in the current calculation cycle according to the adjusted carrier count value peak value.

[0164] Specifically, the modulation wave controller may include:

[0165] The modulation wave count value operator is used to adjust the initial modulation wave count value according to the calibration count value and the preset drive signal duty cycle to obtain the target modulation wave count value of the second chopping unit in the current calculation cycle.

[0166] Specifically, the driving signal modulation unit may include:

[0167] A PWM signal generator is configured to compare the target carrier count value with the target modulation wave count value to obtain a first drive signal; wherein the portion of the target carrier count value that is greater than the target modulation wave count value corresponds to a high level in the first drive signal, and the portion of the target carrier count value that is less than the target modulation wave count value corresponds to a low level in the first drive signal; add a dead zone to the first drive signal to obtain a second drive signal; and use the second drive signal as the target drive signal.

[0168] Specifically, the first chopping unit includes the primary side of the converter or the secondary side of the converter; correspondingly, the module may further include:

[0169] The signal sending unit is configured to send the target driving signal to the second chopping unit; and send the initial driving signal of the first chopping unit as the driving signal of the first chopping unit in the current calculation cycle to the first chopping unit.

[0170] It should be noted that the functions achievable by each device in the phase-shift modulation module provided in this embodiment and the corresponding technical effects achieved can be referred to the description of the specific implementation methods in each embodiment of the phase-shift modulation method of the present invention. For the sake of brevity of the description, they will not be repeated here.

[0171] Example 3

[0172] Based on the same invention concept, Figure 2 and Figure 10 , the first embodiment of the phase shift modulation system of the present invention is proposed. Figure 2 As shown in the connection diagram, the system may include:

[0173] A converter 1000, configured to perform voltage conversion on a received input voltage, the converter comprising a first chopping unit and a second chopping unit; and

[0174] The phase-shift modulation module 2000 is configured to perform phase-shift control on the converter using the phase-shift modulation method described above.

[0175] Specifically, the converter 1000 performs voltage conversion on the received input voltage to obtain an output voltage; and the phase-shift modulation module 2000 performs phase-shift control on the converter 1000 according to the output voltage using the above-mentioned phase-shift modulation method.

[0176] Among them, the converter 1000 can be a transformer device capable of realizing voltage transmission and voltage conversion. The transformer device can be an integrated module, integrated chip, etc. connected to the phase-shift modulation module 2000, or it can be an independent terminal device, embedded device, etc.; similarly, the phase-shift modulation module 2000 can be a control device capable of realizing signal transmission and signal processing. The control device can be an integrated module, integrated chip, etc. connected to the converter 1000, or it can be an independent terminal device, embedded device, etc.

[0177] Specifically, such as Figure 10 As shown in the connection diagram, the converter 1000 may include:

[0178] The input unit 1001 , the first chopping unit 1002 , the voltage transformation unit 1003 , the second chopping unit 1004 and the output unit 1005 are connected in sequence; wherein the first chopping unit 1002 , the second chopping unit 1004 and the output unit 1005 are all connected to the phase shift modulation module 2000 .

[0179] An external power supply or other external device sends direct current to the converter 1000. The input unit 1001 of the converter 1000 receives the input voltage in the form of direct current and sends it to the first chopping unit 1002. The first chopping unit 1002 chops the input voltage into a square wave according to the drive signal (PWM signal) output by the phase-shift modulation module 2000 and sends it to the transformer unit 1003. The transformer unit 1003 transfers energy to the second chopping unit 1004 through the windings on both sides. The second chopping unit 1004 rectifies the received energy into an output voltage in the form of direct current according to the drive signal (PWM signal) output by the phase-shift modulation module 2000, and outputs it to the load or other electrical equipment through the output unit 1005.

[0180] Phase-shift modulation module 2000 performs phase-shift control on converter 1000, specifically by controlling first chopping unit 1002 and second chopping unit 1004 of converter 1000. Phase-shift modulation module 2000 may be a control device including a processor and a memory, or may be a modular device comprising multiple connected units, configured to execute all or part of the steps of the various embodiments of the above-described phase-shift modulation method.

[0181] Specifically, such as Figure 10 As shown in the connection diagram, the phase shift modulation module 2000 may include:

[0182] An adjusting unit 2001, a processing unit 2002, a carrier frequency conversion phase shift controller 2003, a modulation wave controller 2004 and a driving signal modulation unit 2005; wherein, the input end of the adjusting unit 2001 is connected to the output unit 1005 of the converter 1000, the input end of the processing unit 2002 is connected to the output end of the adjusting unit 2001, the input end of the carrier frequency conversion phase shift controller 2003 is connected to the output end of the processing unit 2002, the input end of the modulation wave controller 2004 is connected to the output end of the processing unit 2002, the input end of the driving signal modulation unit 2005 is respectively connected to the output end of the carrier frequency conversion phase shift controller 2003 and the output end of the modulation wave controller 2004, and the output end of the driving signal modulation unit 2005 is connected to the first chopping unit 1002 and the second chopping unit 1004 of the converter 1000.

[0183] Example 4

[0184] Based on the same inventive concept, this embodiment provides a computer-readable storage medium, such as a flash memory, a hard disk, a multimedia card, a card-type memory (e.g., an SD or DX memory), a random access memory (RAM), a static random access memory (SRAM), a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a magnetic memory, a magnetic disk, an optical disk, a server, etc. The storage medium stores a computer program that can be executed by one or more processors. When executed by the processors, the computer program can implement all or part of the steps of each embodiment of the phase-shift modulation method of the present invention.

[0185] It should be noted that the serial numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments. The above are only optional embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present description and drawings under the inventive concept of the present invention, or directly or indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A phase shift modulation method, applied to a converter, wherein the converter comprises a first chopping unit and a second chopping unit, characterized in that: The method comprises: Obtain the phase shift angle of the current calculation cycle and the phase shift angle of the previous calculation cycle; Obtaining a phase shift angle difference according to the phase shift angle of the current calculation cycle and the phase shift angle of the previous calculation cycle; In the case where the first chopping unit is used as a reference chopping unit, obtaining an initial carrier count value peak value and an initial modulation wave count value of the first chopping unit; Adjusting the peak value of the initial carrier count value according to the phase shift angle difference to obtain a target carrier count value of the second chopping unit in the current calculation cycle; Obtaining a preset drive signal duty cycle of the converter; Adjusting the initial modulation wave count value according to the phase shift angle difference and the preset drive signal duty cycle to obtain a target modulation wave count value of the second chopping unit in the current calculation cycle; Based on the target carrier count value and the target modulation wave count value, a target driving signal of the second chopping unit in the current calculation cycle is determined; wherein the driving signal of the first chopping unit remains unchanged.

2. The phase shift modulation method according to claim 1, wherein: The step of obtaining the phase shift angle of the current calculation cycle and the phase shift angle of the previous calculation cycle includes: obtaining an output voltage of the converter; Obtaining a voltage difference according to the output voltage and a preset reference voltage; Performing PI regulation on the voltage difference to obtain a phase shift angle of the current calculation cycle; Obtaining the phase shift angle of the previous calculation cycle from a preset register; The phase shift angle stored in the preset register is updated to the phase shift angle of the current calculation cycle.

3. The phase shift modulation method according to claim 1, wherein: After the step of obtaining the peak value of the initial carrier count value and the initial modulation wave count value of the first chopping unit, the method further includes: The phase shift angle difference is calibrated according to the peak value of the initial carrier count value to obtain a calibrated count value; wherein the calibrated count value is used to represent the count value of the phase shift angle difference when the peak value of the initial carrier count value is used as a reference value.

4. The phase shift modulation method according to claim 3, wherein: The step of adjusting the peak value of the initial carrier count value according to the phase shift angle difference to obtain the target carrier count value of the second chopping unit in the current calculation cycle includes: Adjusting the peak value of the initial carrier count value according to the calibration count value to obtain an adjusted peak value of the carrier count value; A target carrier count value of the second chopping unit in the current calculation cycle is generated according to the adjusted carrier count value peak value.

5. The phase shift modulation method according to claim 3, wherein: The step of adjusting the initial modulation wave count value according to the phase shift angle difference and the preset drive signal duty cycle to obtain the target modulation wave count value of the second chopping unit in the current calculation cycle includes: The initial modulation wave count value is adjusted according to the calibration count value and the preset driving signal duty cycle to obtain a target modulation wave count value of the second chopping unit in the current calculation cycle.

6. The phase shift modulation method according to claim 1, wherein: The step of determining the target driving signal of the second chopping unit in the current calculation cycle based on the target carrier count value and the target modulation wave count value includes: Comparing the target carrier count value and the target modulation wave count value to obtain a first drive signal; wherein the portion of the target carrier count value that is greater than the target modulation wave count value corresponds to a high level in the first drive signal, and the portion of the target carrier count value that is less than the target modulation wave count value corresponds to a low level in the first drive signal; Adding a dead zone to the first driving signal to obtain a second driving signal; The second driving signal is used as the target driving signal.

7. The phase shift modulation method according to claim 1, wherein: The first chopping unit includes a primary side of the converter or a secondary side of the converter; After the step of determining the target drive signal of the second chopping unit in the current calculation cycle based on the target carrier count value and the target modulation wave count value, the method further includes: sending the target drive signal to the second chopping unit; The initial driving signal of the first chopping unit is sent to the first chopping unit as the driving signal of the first chopping unit in the current calculation cycle.

8. A phase shift modulation module, applied to a converter, the converter comprising a first chopping unit and a second chopping unit, characterized in that: include: An adjustment unit, used to determine the phase shift angle of the current calculation cycle and store the phase shift angle of the previous calculation cycle; a processing unit connected to the adjustment unit, configured to output a phase shift angle difference according to the phase shift angle of the current calculation cycle and the phase shift angle of the previous calculation cycle; a carrier frequency conversion phase shift controller connected to the processing unit, configured to obtain, with the first chopping unit as a reference chopping unit, an initial carrier count value peak of the first chopping unit, and adjust the initial carrier count value peak according to the phase shift angle difference to obtain a target carrier count value of the second chopping unit in the current calculation cycle; a modulation wave controller connected to the processing unit, configured to obtain an initial modulation wave count value of the first chopping unit and a preset drive signal duty cycle of the converter when the first chopping unit is used as a reference chopping unit, and adjust the initial modulation wave count value according to the phase shift angle difference and the preset drive signal duty cycle to obtain a target modulation wave count value of the second chopping unit in the current calculation cycle; as well as a driving signal modulation unit, connected to the carrier frequency conversion phase shift controller and the modulation wave controller respectively, for determining a target driving signal of the second chopping unit in the current calculation cycle based on the target carrier count value and the target modulation wave count value; The initial driving signal of the first chopping unit is used as the driving signal of the first chopping unit in the current calculation cycle.

9. A phase shift modulation system, characterized in that: include: a converter, configured to perform voltage conversion on a received input voltage, the converter comprising a first chopping unit and a second chopping unit; as well as A phase-shift modulation module, configured to perform phase-shift control on the converter using the phase-shift modulation method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that The storage medium stores a computer program, and when the computer program is executed by one or more processors, the phase shift modulation method according to any one of claims 1 to 7 is implemented.

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