A power supply topology and method of controlling the same, medium

Abstract

This invention discloses a power supply topology and its control method and medium. The power supply topology includes: an LLC resonant circuit, comprising a chopper circuit, three resonant inductors, three resonant capacitors, a transformer circuit, a three-phase bridge, and an output resistor; a detection device for detecting the primary current of the transformer circuit, the output current of the rectifier circuit, and the output voltage; a feedback control circuit for performing constant current control or constant power control through frequency modulation control within the normal operating frequency range, and for performing constant current control or constant power control through pulse width modulation control when the output current or output power still exceeds a preset output range after the operating frequency reaches the maximum operating frequency; the minimum operating frequency is obtained based on a preset output voltage ripple coefficient, and the maximum operating frequency is obtained based on the minimum operating frequency and the gain curve of the LLC resonant circuit. This invention can reduce residual energy, reduce output ripple, improve power supply response speed, and improve power supply efficiency.

Description

Technical Field

[0001] This invention relates to the field of power supply technology, and in particular to a power supply topology and its control method and medium. Background Technology

[0002] Coating power supplies are widely used in solar photovoltaic panel manufacturing, semiconductor manufacturing, and plasma implantation. However, traditional coating power supplies require large-value output inductors and capacitors for filtering to reduce output voltage and current ripple. This results in a large amount of residual energy inside the power supply, limiting the response speed and preventing the power supply from adjusting in real time according to load changes. Consequently, the coating process accuracy is reduced, the yield of coated parts is low, and production costs are increased. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a control method for a power supply topology that can reduce residual energy, reduce output ripple, improve power supply response speed, and improve power supply efficiency.

[0004] The present invention also provides a power supply topology control method, a control device for performing the power supply topology control method, and a computer-readable storage medium.

[0005] According to a first aspect of the present invention, a power supply topology includes:

[0006] An LLC resonant circuit includes a chopper circuit, three resonant inductors, three resonant capacitors, a transformer circuit, and a rectifier circuit. The chopper circuit has a first DC voltage input terminal and a second DC voltage input terminal, which share a common DC voltage input, as well as a first DC voltage output terminal, a second DC voltage output terminal, and a third DC voltage output terminal. One end of each of the three resonant inductors is connected to the first DC voltage output terminal, the second DC voltage output terminal, and the third DC voltage output terminal, respectively. One end of each of the three resonant capacitors is connected to the other end of each of the three resonant inductors. The transformer circuit has separate... The transformer circuit includes a first transformer input terminal, a second transformer input terminal, and a third transformer input terminal, which are connected to the other ends of the three resonant capacitors, as well as a first transformer output terminal, a second transformer output terminal, and a third transformer output terminal. The rectifier circuit includes a three-phase bridge and an output resistor. The three-phase bridge has a first rectifier output terminal, a second rectifier output terminal, a first rectifier input terminal connected to the first transformer output terminal, a second rectifier input terminal connected to the second transformer output terminal, and a third rectifier input terminal connected to the third transformer output terminal. The two ends of the output resistor are respectively connected to the first rectifier output terminal and the second rectifier output terminal.

[0007] The detection device is used to detect the primary current on the transformer input side of the transformer circuit, as well as the output current and output voltage of the rectifier circuit.

[0008] A feedback control circuit is connected to the switching transistors of the detection device and the chopper circuit, respectively. The feedback control circuit is used to perform constant current control or constant power control through frequency modulation control based on the primary current, the output current, and the output voltage within the normal operating frequency range of the switching transistor. It is also used to perform constant current control or constant power control through pulse width modulation control when the output current or output power is still greater than the maximum value of the corresponding preset output range after the operating frequency of the switching transistor reaches the highest operating frequency within the normal operating frequency range. The lowest operating frequency within the normal operating frequency range is obtained based on a preset output voltage ripple coefficient, and the highest operating frequency is obtained based on the lowest operating frequency and the gain curve of the LLC resonant circuit.

[0009] The power supply topology according to embodiments of the present invention has at least the following beneficial effects:

[0010] The power supply topology of this embodiment employs an LLC resonant circuit, which improves power supply efficiency. Furthermore, the LLC resonant circuit eliminates the need for output inductors and capacitors for filtering; instead, it sets the minimum operating frequency of the switching transistor by pre-setting the output voltage ripple coefficient. The maximum operating frequency is determined based on the minimum operating frequency and the gain curve of the LLC resonant circuit, ensuring the switching transistor operates within its normal operating frequency range. This guarantees the coating accuracy after removing the output inductor and capacitor, thereby reducing residual energy within the power supply and improving its response speed. Due to the soft-switching characteristics of the LLC resonant circuit, its minimum resonant frequency (i.e., minimum operating frequency) is higher than the maximum operating frequency of the IGBT in traditional coating power supplies. The high-frequency operation of the switching transistor in this embodiment reduces output ripple, further enhancing the power supply response speed. The power supply topology of this invention performs constant current control or constant power control through frequency modulation control within the normal operating frequency range of the switching transistor; when the output current or output power is still greater than the maximum value of the corresponding preset output range after the operating frequency of the switching transistor reaches the highest operating frequency range, constant current control or constant power control is performed through pulse width modulation control. The hybrid control of frequency modulation control and pulse width modulation control ensures normal output control while the switching transistor operates within the normal operating frequency range, and also improves power supply control efficiency.

[0011] According to some embodiments of the present invention, the detection device includes:

[0012] A first current sensor is used to detect the primary current;

[0013] A second current sensor is used to detect the output current;

[0014] A voltage sampling circuit is used to detect the output voltage.

[0015] According to some embodiments of the present invention, the constraint formula for the minimum operating frequency is:

[0016]

[0017] Where f1 is the minimum operating frequency, α is the preset output voltage ripple coefficient, and L r C is the inductance value of the resonant inductor. r The capacitance value of the resonant capacitor;

[0018] The constraint formula for the highest operating frequency is: f2 = 3f1, where f2 is the highest operating frequency and f1 is the lowest operating frequency. The highest operating frequency is obtained based on the lowest operating frequency and the gain curve of the LLC resonant circuit.

[0019] A power topology control method according to a second aspect of the present invention is applied to a power topology as described in the first aspect embodiment above. The power topology control method includes the following steps:

[0020] Obtain the primary current, the output current, and the operating frequency of the switching transistor in the chopper circuit;

[0021] If the operating frequency is within the normal operating frequency range, a first frequency modulation control signal is generated based on the primary current, the output current, and the preset current output threshold and sent to the switching transistor to adjust the operating frequency of the switching transistor within the normal operating frequency range, so that the output current is within the preset current output range, where the current output range characterizes the error range of the current output threshold.

[0022] If the output current is still greater than the maximum value of the preset current output range after the operating frequency reaches the maximum operating frequency, a first pulse width modulation control signal is generated based on the primary current, the output current, and the preset current output threshold and sent to the switching transistor, so as to reduce the duty cycle so that the output current is within the preset current output range.

[0023] The power supply topology control method according to embodiments of the present invention has at least the following beneficial effects:

[0024] The power supply topology of this embodiment employs an LLC resonant circuit, which improves power supply efficiency. Furthermore, the LLC resonant circuit eliminates the need for output inductors and capacitors for filtering; instead, it sets the minimum operating frequency of the switching transistor by pre-setting the output voltage ripple coefficient. The maximum operating frequency is determined based on the minimum operating frequency and the gain curve of the LLC resonant circuit, ensuring the switching transistor operates within its normal operating frequency range. This guarantees the coating accuracy after removing the output inductor and capacitor, thereby reducing residual energy within the power supply and improving its response speed. Due to the soft-switching characteristics of the LLC resonant circuit, its minimum resonant frequency (i.e., minimum operating frequency) is higher than the maximum operating frequency of the IGBT in traditional coating power supplies. The high-frequency operation of the switching transistor in this embodiment reduces output ripple, further enhancing the power supply response speed. The power supply topology control method of this invention performs constant current control through frequency modulation control within the normal operating frequency range of the switching transistor; when the output current is still greater than the maximum value of the preset current output range after the operating frequency of the switching transistor reaches the highest operating frequency range, constant current control is performed through pulse width modulation control. The hybrid control of frequency modulation control and pulse width modulation control ensures normal output control under the premise that the switching transistor operates within the normal operating frequency range, while also improving power supply control efficiency.

[0025] According to some embodiments of the present invention, the step of generating a first frequency modulation control signal based on the primary current, the output current, and a preset current output threshold and sending it to the switching transistor includes the following steps:

[0026] The current difference is obtained by subtracting the output current from the preset current output threshold.

[0027] The target primary current setting value is obtained by subtracting the primary current and the current difference.

[0028] Based on the target primary current setting value, as well as the preset proportional coefficient, integral coefficient, and maximum adjustment limit current, PI control is performed to obtain the current adjustment amount;

[0029] The first frequency modulation control signal is generated based on the current adjustment amount and sent to the switching transistor.

[0030] According to some embodiments of the present invention, the step of generating a first pulse width modulation control signal based on the primary current, the output current, and a preset current output threshold, and sending it to the switching transistor, includes the following steps:

[0031] The current difference is obtained by subtracting the output current from the preset current output threshold.

[0032] The target primary current setting value is obtained by subtracting the primary current and the current difference.

[0033] Based on the target primary current setting value, as well as the preset proportional coefficient, integral coefficient, and maximum adjustment limit current, PI control is performed to obtain the current adjustment amount;

[0034] The first pulse width modulation control signal is generated based on the current regulation amount and sent to the switching transistor.

[0035] A power topology control method according to a third aspect embodiment of the present invention is applied to a power topology as described in the first aspect embodiment above, the power topology control method comprising the following steps:

[0036] Obtain the primary current, the output current, the output voltage, and the operating frequency of the switching transistor in the chopper circuit;

[0037] If the operating frequency is within the normal operating frequency range, a second frequency modulation control signal is generated based on the primary current, the output current, the output voltage, and the preset power output threshold and sent to the switching transistor to adjust the operating frequency of the switching transistor within the normal operating frequency range, so that the output power of the rectifier circuit is within the preset power output range, wherein the power output range characterizes the error range of the power output threshold.

[0038] If the output power is still greater than the maximum value of the preset power output range after the operating frequency reaches the maximum operating frequency, a second pulse width modulation control signal is generated based on the primary current, the output current, the output voltage, and the preset power output threshold and sent to the switching transistor, so as to reduce the duty cycle so that the output power is within the preset power output range.

[0039] The power supply topology control method according to embodiments of the present invention has at least the following beneficial effects:

[0040] The power supply topology of this embodiment employs an LLC resonant circuit, which improves power supply efficiency. Furthermore, the LLC resonant circuit eliminates the need for output inductors and capacitors for filtering; instead, it sets the minimum operating frequency of the switching transistor by pre-setting the output voltage ripple coefficient. The maximum operating frequency is determined based on the minimum operating frequency and the gain curve of the LLC resonant circuit, ensuring the switching transistor operates within its normal operating frequency range. This guarantees the coating accuracy after removing the output inductor and capacitor, thereby reducing residual energy within the power supply and improving its response speed. Due to the soft-switching characteristics of the LLC resonant circuit, its minimum resonant frequency (i.e., minimum operating frequency) is higher than the maximum operating frequency of the IGBT in traditional coating power supplies. The high-frequency operation of the switching transistor in this embodiment reduces output ripple, further enhancing the power supply response speed. The power supply topology control method of this invention performs constant power control through frequency modulation control within the normal operating frequency range of the switching transistor; when the output power is still greater than the maximum value of the preset power output range after the operating frequency of the switching transistor reaches the highest operating frequency within the normal operating frequency range, constant power control is performed through pulse width modulation control. The hybrid control of frequency modulation control and pulse width modulation control ensures normal output control while the switching transistor operates within the normal operating frequency range, and also improves power supply control efficiency.

[0041] According to some embodiments of the present invention, the step of generating a second frequency modulation control signal based on the primary current, the output current, the output voltage, and a preset power output threshold, and sending it to the switching transistor, includes the following steps:

[0042] The output power is calculated based on the output current and the output voltage.

[0043] The power difference is obtained by subtracting the output power from the preset power output threshold.

[0044] The target primary current setting value is obtained by subtracting the primary current and the power difference.

[0045] Based on the target primary current setting value, as well as the preset proportional coefficient, integral coefficient, and maximum adjustment limit power, PI control is performed to obtain the power adjustment amount;

[0046] The second frequency modulation control signal is generated based on the power adjustment amount and sent to the switching transistor.

[0047] According to some embodiments of the present invention, the step of generating a second pulse width modulation control signal based on the primary current, the output current, the output voltage, and the preset power output threshold, and sending it to the switching transistor, includes the following steps:

[0048] The output power is calculated based on the output current and the output voltage.

[0049] The power difference is obtained by subtracting the output power from the preset power output threshold.

[0050] The target primary current setting value is obtained by subtracting the primary current and the power difference.

[0051] Based on the target primary current setting value, as well as the preset proportional coefficient, integral coefficient, and maximum adjustment limit power, PI control is performed to obtain the power adjustment amount;

[0052] The second pulse width modulation control signal is generated based on the power adjustment amount and sent to the switching transistor.

[0053] A control device according to a fourth aspect embodiment of the present invention includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the power topology control method as described in the second and third aspect embodiments above. Since the control device employs all the technical solutions of the power topology control method of the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments.

[0054] According to a fifth aspect embodiment of the present invention, a computer-readable storage medium stores computer-executable instructions for performing a power topology control method as described in the second and third aspect embodiments above. Since the computer-readable storage medium employs all the technical solutions of the power topology control method of the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments.

[0055] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. Attached Figure Description

[0056] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0057] Figure 1 This is an electrical schematic diagram of a power supply topology according to an embodiment of the present invention;

[0058] Figure 2 This is a schematic diagram of constant current control according to an embodiment of the present invention;

[0059] Figure 3 This is a schematic diagram of constant power control according to an embodiment of the present invention;

[0060] Figure 4 This is a flowchart of a power supply topology control method according to an embodiment of the present invention;

[0061] Figure 5 This is a flowchart of a control method for a power supply topology according to another embodiment of the present invention;

[0062] Figure 6 This is an output waveform diagram of a power supply topology according to an embodiment of the present invention;

[0063] Figure 7 This is a waveform diagram of the output voltage when the operating frequency of the switching transistor is 100KHz, according to an embodiment of the present invention.

[0064] Figure 8 This is a waveform diagram of the output voltage when the operating frequency of the switching transistor is 200KHz, according to an embodiment of the present invention.

[0065] Figure label:

[0066] Chopper circuit 110, resonant inductor 120, resonant capacitor 130, transformer circuit 140, three-phase bridge 150;

[0067] First current sensor 210, second current sensor 220, voltage sampling circuit 230;

[0068] Feedback control circuit 300. Detailed Implementation

[0069] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0070] In the description of this invention, the use of terms such as "first," "second," etc., is for the purpose of distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features indicated, or implicitly indicating the order of the technical features indicated.

[0071] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0072] In the description of this invention, it should be noted that, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0073] The following will combine Figures 1 to 8 The power supply topology of the embodiments of the present invention will be clearly and completely described. Obviously, the embodiments described below are some embodiments of the present invention, not all embodiments.

[0074] According to a first aspect of the present invention, a power supply topology includes an LLC resonant circuit, a detection device, and a feedback control circuit 300.

[0075] The LLC resonant circuit includes a chopper circuit 110, three resonant inductors 120, three resonant capacitors 130, a transformer circuit 140, and a rectifier circuit. The chopper circuit 110 has a first DC voltage input terminal and a second DC voltage input terminal, all for inputting DC power, as well as a first DC voltage output terminal, a second DC voltage output terminal, and a third DC voltage output terminal. One end of each of the three resonant inductors 120 is connected to the first, second, and third DC voltage output terminals, respectively. One end of each of the three resonant capacitors 130 is connected to the other end of each of the three resonant inductors 120. The transformer circuit 140 has a first transformer input terminal, a second transformer input terminal, and a third transformer input terminal, which are respectively connected to the other ends of three resonant capacitors 130, as well as a first transformer output terminal, a second transformer output terminal, and a third transformer output terminal; the rectifier circuit includes a three-phase bridge 150 and an output resistor. The three-phase bridge 150 has a first rectifier output terminal, a second rectifier output terminal, a first rectifier input terminal connected to the first transformer output terminal, a second rectifier input terminal connected to the second transformer output terminal, and a third rectifier input terminal connected to the third transformer output terminal. The two ends of the output resistor are respectively connected to the first rectifier output terminal and the second rectifier output terminal.

[0076] The detection device is used to detect the primary current on the transformer input side of the transformer circuit 140, as well as the output current and output voltage of the rectifier circuit.

[0077] The feedback control circuit 300 is connected to the switching transistors of the detection device and the chopper circuit 110, respectively. The feedback control circuit 300 is used to perform constant current control or constant power control by frequency modulation control within the normal operating frequency range of the switching transistor based on the primary current, output current, and output voltage. It is also used to perform constant current control or constant power control by pulse width modulation control when the output current or output power is still greater than the maximum value of the corresponding preset output range after the operating frequency of the switching transistor reaches the highest operating frequency of the normal operating frequency range. The lowest operating frequency of the normal operating frequency range is obtained based on the preset output voltage ripple coefficient, and the highest operating frequency is obtained based on the lowest operating frequency and the gain curve of the LLC resonant circuit.

[0078] like Figure 1 As shown, the chopper circuit 110 includes six switching transistors (S1, S2, S3, S4, S5, S6), all of which are SiC MOSFETs with soft-switching characteristics. Their lowest resonant frequency is:

[0079]

[0080] Among them, L r For the inductance of the resonant inductor 120, C r This is the capacitance value of the resonant capacitor 130.

[0081] The transformer circuit 140 adopts a Y-type connection (i.e., a star connection for three-phase electricity), and the resonant inductor 120 utilizes the primary leakage inductance of the transformer and is integrated into the transformer, which can improve the power density of the power supply.

[0082] The output of the rectifier circuit is directly connected to the load, eliminating the need for output inductors and capacitors for filtering. This reduces residual energy within the power supply, allowing for rapid adjustment based on real-time load changes. Furthermore, it enables rapid arc extinguishing during power outages, improving coating accuracy and power supply response speed. To ensure coating accuracy after removing the output inductor and capacitor, the six switching transistors in this embodiment must operate within their normal operating frequency range. The minimum operating frequency within this range is determined based on a preset output voltage ripple coefficient. This minimum operating frequency f1 can be obtained by fitting empirical values ​​from testing.

[0083]

[0084] Where f1 is the minimum operating frequency, α is the preset output voltage ripple coefficient, and L r For the inductance of the resonant inductor 120, C r This is the capacitance value of the resonant capacitor 130. The standard output voltage ripple factor is generally no more than 5%, but this should not be considered a limitation of the present invention; a specific output voltage ripple factor can be set according to actual conditions.

[0085] Based on the constraint formulas for the minimum operating frequency and the minimum resonant frequency of the LLC resonant circuit, it can be seen that the minimum operating frequency is very close to the minimum resonant frequency of the LLC resonant circuit. From the gain curve of the LLC resonant circuit, it can be seen that when the operating frequency is greater than 3f1, its actual adjustable range is very small. Therefore, the constraint formula for the highest operating frequency f2 in the normal operating frequency range is: f2 = 3f1.

[0086] The power supply topology of this invention has two control processes: constant current control and constant power control.

[0087] During constant current control, since the switching transistor must operate within its normal operating frequency range, when the operating frequency f of the switching transistor... s When f1≤f s When the current is less than or equal to f2, constant current control is achieved using frequency modulation (PFM). When the output current is less than the preset current output threshold, PFM control will decrease the operating frequency of the switching transistor; conversely, it will increase the operating frequency. During this process, when the operating frequency f of the switching transistor... s If reaching f2 still fails to meet the feedback control requirements (i.e., the output current is still greater than the maximum value of the preset current output range), pulse width modulation (PWM) control is used for constant current control. This is achieved by reducing the duty cycle to keep the output current within the preset current output range. It should be noted that the output current will reach its maximum when the switching transistor operates at its lowest operating frequency f1, and the preset current output threshold will not exceed this maximum value. The current output range characterizes the error interval of the current output threshold.

[0088] During constant power control, since the switching transistor must operate within its normal operating frequency range, when the operating frequency f of the switching transistor... s When f1≤f s When the output power is less than or equal to f2, constant power control is performed using frequency modulation (PFM). The output power is the product of the output current and the output voltage. When the output power is less than the preset power output threshold, PFM control will reduce the operating frequency of the switching transistor, and vice versa. During this process, when the operating frequency f of the switching transistor is... s If reaching f2 still fails to meet the feedback control requirements (i.e., the output power is still greater than the maximum value of the preset power output range), pulse width modulation (PWM) control is used for constant power control. This is achieved by reducing the duty cycle to keep the output power within the preset power output range. It should be noted that the output power will reach its maximum when the switching transistor operates at its lowest operating frequency f1, and the preset power output threshold will not exceed this maximum value. The power output range characterizes the error interval of the power output threshold.

[0089] In constant current control and constant power control, the primary current is used for overall circuit protection control to prevent excessive primary current from damaging the switching transistor.

[0090] Specifically, the feedback control circuit 300 includes a constant current control circuit and a constant power control circuit. For example... Figure 2 As shown, the constant current control circuit includes a first subtractor, a second subtractor, a first PI circuit, and a first control circuit. Figure 3 As shown, the constant power control circuit includes a multiplier, a third subtractor, a fourth subtractor, a second PI circuit, and a second control circuit.

[0091] (1) The constant current control process includes the following steps:

[0092] Obtain the primary current I pr Output current I sec The operating frequency f of the switching transistor of the chopper circuit 110 s ;

[0093] If the operating frequency f s Within the normal operating frequency range (i.e., f1≤f) s ≤f2), the output current I is reduced by the first subtractor. sec and the preset current output threshold I sec_set The difference is obtained by subtracting the values ​​of the currents, ΔI. sec ;

[0094] The primary current I is reduced by the second subtractor. pr and current difference ΔI sec The target primary current setpoint I is obtained by subtraction. pr_set_i (primary current I) pr The primary current of transformer circuit 140 during the current adjustment cycle, and the target primary current setpoint I. pr_set_i (The primary current setting value for the transformer circuit 140 in the next adjustment cycle);

[0095] Set the target primary current setting value I pr_set_i and the preset proportional coefficient K p Integral coefficient K i and maximum regulating limit current δI max Input the first PI circuit for PI control to obtain the current adjustment amount δI;

[0096] The current regulation value δI is input to the first control circuit to generate a first pulse width modulation control signal and sent to the switching transistor to adjust the operating frequency of the switching transistor within the normal operating frequency range, so that the output current I... sec Within the preset current output range;

[0097] If the operating frequency f sAfter reaching the highest operating frequency f2, the output current I sec If the current is still greater than the maximum value of the preset current output range, the current adjustment amount δI is input to the first control circuit to generate the first pulse width adjustment control signal and sent to the switching transistor, so as to reduce the duty cycle to make the output current I... sec Within the preset current output range.

[0098] (2) The constant power control process includes the following steps:

[0099] Obtain the primary current I pr Output current I sec The output voltage U0 and the operating frequency f of the switching transistor of the chopper circuit 110 s ;

[0100] If the operating frequency f s Within the normal operating frequency range (i.e., f1≤f) s ≤f2), the output current I sec The output power P is calculated by inputting the output voltage U0 into the multiplier. sec ;

[0101] The output power P is adjusted using the third subtractor. sec and the preset power output threshold P sec_set The power difference ΔP is obtained by subtraction. sec ;

[0102] The primary current I is reduced by the fourth subtractor. pr and power difference ΔP sec The target primary current setpoint I is obtained by subtraction. pr_set_i ;

[0103] Set the target primary current setting value I pr_set_i and the preset proportional coefficient K p Integral coefficient K i and maximum regulation limit power δP max Input the second PI circuit for PI control to obtain the power regulation amount δP;

[0104] The power regulation value δP is input to the second control circuit to generate a second frequency modulation control signal, which is then sent to the switching transistor to adjust the operating frequency of the switching transistor within the normal operating frequency range, thereby increasing the output power P. sec Within the preset power output range;

[0105] If the operating frequency f s After reaching the highest operating frequency f2, the output power P secIf the output power is still greater than the maximum value of the preset power output range, the power adjustment amount δP is input to the second control circuit to generate a second pulse width adjustment control signal and sent to the switching transistor, so as to reduce the duty cycle and increase the output power P. sec Within the preset power output range.

[0106] The power supply topology of this invention uses a hybrid control method of frequency modulation control and pulse width modulation control to ensure normal output control while the switching transistor operates within its normal operating frequency range, and at the same time improves power supply control efficiency.

[0107] The power supply topology of this invention employs an LLC resonant circuit, which can improve power supply efficiency. The specific working principle of the LLC resonant circuit is prior art known to those skilled in the art and will not be described in detail here.

[0108] In some embodiments of the present invention, the switching transistor operates within the normal operating frequency range, and the lowest resonant frequency point (i.e., the lowest operating frequency) of the LLC resonant circuit is generally around 100kHz. However, traditional coated power supplies, in order to meet the requirements of high power output and low ripple, and to reduce costs, use IGBTs as switching transistors, and their maximum operating frequency cannot exceed 40kHz. For example... Figure 6 As shown, the output voltage ripple is the envelope of the three-phase voltage. Figure 7 and Figure 8 As shown, Figure 7 This is the output voltage at an operating frequency of 100kHz. Figure 8 The figure shows the output voltage at an operating frequency of 200kHz. As can be seen from the figure, the output voltage ripple is approximately 342V at an operating frequency of 100kHz, while it is approximately 310V at an operating frequency of 200kHz. This demonstrates that higher frequency operation reduces the power supply's output ripple, and the output ripple corresponding to higher frequency operation is superior to that corresponding to lower frequency operation. The operating frequency of the switching transistor in the power supply topology of this embodiment is higher than that of the switching transistor in a traditional coated power supply. Therefore, compared to a traditional coated power supply, the power supply topology of this embodiment has lower output ripple and faster power response speed.

[0109] According to the power supply topology of this embodiment, an LLC resonant circuit is used to improve power supply efficiency. Furthermore, the LLC resonant circuit eliminates the need for output inductors and capacitors for filtering; instead, the minimum operating frequency of the switching transistor is set by pre-setting the output voltage ripple coefficient. The maximum operating frequency is determined based on the minimum operating frequency and the gain curve of the LLC resonant circuit, ensuring the switching transistor operates within its normal operating frequency range. This guarantees the coating accuracy after removing the output inductor and capacitor, thereby reducing residual energy within the power supply and improving its response speed. Due to the soft-switching characteristics of the LLC resonant circuit, its minimum resonant frequency (i.e., minimum operating frequency) is higher than the maximum operating frequency of the IGBT in traditional coating power supplies. The high-frequency operation of the switching transistor in this embodiment reduces output ripple, further improving power supply response speed. The power supply topology of this invention performs constant current control or constant power control through frequency modulation control within the normal operating frequency range of the switching transistor; when the output current or output power is still greater than the maximum value of the corresponding preset output range after the operating frequency of the switching transistor reaches the highest operating frequency range, constant current control or constant power control is performed through pulse width modulation control. The hybrid control of frequency modulation control and pulse width modulation control ensures normal output control while the switching transistor operates within the normal operating frequency range, and also improves power supply control efficiency.

[0110] In some embodiments of the present invention, reference is made to Figure 1 The detection device includes a first current sensor 210, a second current sensor 220, and a voltage sampling circuit 230.

[0111] The first current sensor 210 is used to detect the primary current;

[0112] The second current sensor 220 is used to detect the output current;

[0113] The voltage sampling circuit 230 is used to detect the output voltage.

[0114] It should be noted that the working principles of the current sensor and voltage sampling circuit 230 are existing technologies known to those skilled in the art, and will not be elaborated upon here. Furthermore, the specific model of the current sensor and the specific circuit structure of the voltage sampling circuit 230 can be selected according to actual needs, and are not specifically limited here.

[0115] The following will combine Figures 1 to 8 The control method of the power supply topology of the present invention will be clearly and completely described. Obviously, the embodiments described below are some embodiments of the present invention, not all embodiments.

[0116] According to a second aspect embodiment of the present invention, a power topology control method is applied to a power topology as described in the first aspect embodiment above. The power topology control method includes the following steps:

[0117] Obtain the primary current I pr Output current I sec The operating frequency f of the switching transistor of the chopper circuit 110 s ;

[0118] If the operating frequency f s Within the normal operating frequency range (i.e., f1≤f) s ≤f2), according to the primary current I pr Output current I sec Preset current output threshold I sec_set A first frequency modulation control signal is generated and sent to the switching transistor to adjust the operating frequency f of the switching transistor within the normal operating frequency range. s This causes the output current I to be... sec Within the preset current output range, the current output range characterizes the current output threshold I. sec_set The error range;

[0119] If the operating frequency f s After reaching the highest operating frequency (i.e., f2), the output current I sec It is still greater than the maximum value of the preset current output range, according to the primary current I. pr Output current I sec Preset current output threshold I sec_set A first pulse width modulation control signal is generated and sent to the switching transistor to reduce the output current I by decreasing the duty cycle. sec Within the preset current output range.

[0120] During constant current control, since the switching transistor must operate within its normal operating frequency range, when the operating frequency f of the switching transistor... s When f1≤f s When the current is ≤f2, constant current control is performed using frequency modulation control (PFM). When the output current I... sec Less than the preset current output threshold I sec_set At this time, PFM control will reduce the operating frequency f of the switching transistor. s Conversely, increase the operating frequency f s During this process, when the operating frequency f of the switching transistor... s Even reaching f2 still cannot meet the feedback control requirements (i.e., output current I). sec If the current output is still greater than the maximum value of the preset current output range, pulse width modulation (PWM) control is used for constant current control. By reducing the duty cycle, the output current I is reduced. secWithin the preset current output range, a hybrid control method combining frequency modulation control and pulse width modulation control can ensure normal output control while keeping the switching transistor operating within its normal operating frequency range, and also improve power supply control efficiency.

[0121] It should be noted that the output current I is when the switching transistor is operating at its lowest operating frequency f1. sec It will reach the maximum, preset current output threshold I sec_set It will not exceed the maximum value.

[0122] During constant current control, the primary current I pr Used for overall circuit protection and control to prevent primary current I pr Excessive voltage can damage the switching transistor.

[0123] In some embodiments of the present invention, reference is made to Figure 2 According to the primary current I pr Output current I sec Preset current output threshold I sec_set Generating the first frequency modulation control signal and sending it to the switching transistor includes the following steps:

[0124] For output current I sec and the preset current output threshold I sec_set The difference is obtained by subtracting the values ​​of the currents, ΔI. sec ;

[0125] For the primary current I pr and current difference ΔI sec The target primary current setpoint I is obtained by subtraction. pr_set_i (primary current I) pr The primary current of transformer circuit 140 during the current adjustment cycle, and the target primary current setpoint I. pr_set_i (The primary current setting value for the transformer circuit 140 in the next adjustment cycle);

[0126] Based on the target primary current setting value I pr_set_i and the preset proportional coefficient K p Integral coefficient K i and maximum regulating limit current δI max By performing PI control, the current regulation value δI is obtained;

[0127] The first frequency modulation control signal is generated based on the current adjustment amount δI and sent to the switching transistor.

[0128] In some embodiments of the present invention, reference is made to Figure 2 According to the primary current I pr Output current I sec Preset current output threshold I sec_setGenerating the first pulse width modulation control signal and sending it to the switching transistor includes the following steps:

[0129] For output current I sec and the preset current output threshold I sec_set The difference is obtained by subtracting the values ​​of the currents, ΔI. sec ;

[0130] For the primary current I pr and current difference ΔI sec The target primary current setpoint I is obtained by subtraction. pr_set_i ;

[0131] Based on the target primary current setting value I pr_set_i and the preset proportional coefficient K p Integral coefficient K i and maximum regulating limit current δI max By performing PI control, the current regulation value δI is obtained;

[0132] The first pulse width modulation control signal is generated based on the current regulation amount δI and sent to the switching transistor.

[0133] Since the power supply topology control method of the second aspect embodiment of the present invention adopts all the technical solutions of the power supply topology of the first aspect embodiment described above, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments.

[0134] According to the power supply topology control method of this embodiment, the power supply topology adopts an LLC resonant circuit, which can improve power supply efficiency. Furthermore, the LLC resonant circuit eliminates the need for output inductors and capacitors for filtering; instead, it sets the minimum operating frequency of the switching transistor by presetting the output voltage ripple coefficient. The maximum operating frequency is determined based on the minimum operating frequency and the gain curve of the LLC resonant circuit, ensuring the switching transistor operates within its normal operating frequency range. This guarantees the coating accuracy after removing the output inductor and capacitor, thereby reducing residual energy within the power supply and improving its response speed. Due to the soft-switching characteristics of the LLC resonant circuit, its minimum resonant frequency (i.e., minimum operating frequency) is higher than the maximum operating frequency of the IGBT in traditional coating power supplies. The high-frequency operation of the switching transistor in the power supply topology of this embodiment reduces the output ripple of the power supply, further improving the power supply response speed. The power supply topology control method of this invention performs constant current control through frequency modulation control within the normal operating frequency range of the switching transistor; when the output current is still greater than the maximum value of the preset current output range after the operating frequency of the switching transistor reaches the highest operating frequency range, constant current control is performed through pulse width modulation control. The hybrid control of frequency modulation control and pulse width modulation control ensures normal output control under the premise that the switching transistor operates within the normal operating frequency range, while also improving power supply control efficiency.

[0135] The following will combine Figures 1 to 8 The control method of the power supply topology of the present invention will be clearly and completely described. Obviously, the embodiments described below are some embodiments of the present invention, not all embodiments.

[0136] According to a third aspect embodiment of the present invention, a power topology control method is applied to a power topology as described in the first aspect embodiment above. The power topology control method includes the following steps:

[0137] Obtain the primary current I pr Output current I sec The output voltage U0 and the operating frequency f of the switching transistor of the chopper circuit 110 s ;

[0138] If the operating frequency f s Within the normal operating frequency range (i.e., f1≤f) s ≤f2), according to the primary current I pr Output current I sec Output voltage U0, preset power output threshold P sec_set A second frequency modulation control signal is generated and sent to the switching transistor to adjust the operating frequency f of the switching transistor within the normal operating frequency range. sThis makes the output power P of the rectifier circuit... sec Within the preset power output range, the power output range characterizes the power output threshold P. sec_set The error range;

[0139] If the operating frequency f s After reaching the highest operating frequency (i.e., f2), the output power P sec Still greater than the maximum value of the preset power output range, according to the primary current I pr Output current I sec Output voltage U0, preset power output threshold P sec_set A second pulse width modulation control signal is generated and sent to the switching transistor to reduce the output power P by decreasing the duty cycle. sec Within the preset power output range.

[0140] During constant power control, since the switching transistor must operate within its normal operating frequency range, when the operating frequency f of the switching transistor... s When f1≤f s When the power is ≤f2, constant power control is performed using frequency modulation control (PFM). Output power P sec For the output current I sec The product of the output voltage U0 and the output power P sec Less than the preset power output threshold P sec_set At this time, PFM control will reduce the operating frequency f of the switching transistor. s Conversely, increase the operating frequency f s During this process, when the operating frequency f of the switching transistor... s Even reaching f2 still cannot meet the feedback control requirements (i.e., output power P). sec If the output power is still greater than the maximum value of the preset power output range, constant power control is performed using pulse width modulation (PWM). This is achieved by reducing the duty cycle to increase the output power P. sec Within the preset power output range, a hybrid control method combining frequency modulation control and pulse width modulation control can ensure normal output control while keeping the switching transistor operating within its normal operating frequency range, and also improve power supply control efficiency.

[0141] It should be noted that the output power P is [not specified] when the switching transistor operates at its lowest operating frequency f1. sec It will reach the maximum, preset power output threshold P sec_set It will not exceed the maximum value.

[0142] During constant power control, the primary current I pr Used for overall circuit protection and control to prevent primary current I pr Excessive voltage can damage the switching transistor.

[0143] In some embodiments of the present invention, reference is made to Figure 3 According to the primary current I pr Output current I sec Output voltage U0, preset power output threshold P sec_set Generating a second frequency modulation control signal and sending it to the switching transistor includes the following steps:

[0144] Based on the output current I sec The output power P is calculated from the output voltage U0. sec ;

[0145] For output power P sec and the preset power output threshold P sec_set The power difference ΔP is obtained by subtraction. sec ;

[0146] For the primary current I pr and power difference ΔP sec The target primary current setpoint I is obtained by subtraction. pr_set_i (primary current I) pr The primary current of transformer circuit 140 during the current adjustment cycle, and the target primary current setpoint I. pr_set_i (The primary current setting value for the transformer circuit 140 in the next adjustment cycle);

[0147] Based on the target primary current setting value I pr_set_i and the preset proportional coefficient K p Integral coefficient K i and maximum regulation limit power δP max PI control is performed to obtain the power regulation amount δP;

[0148] A second frequency modulation control signal is generated based on the power adjustment amount δP and sent to the switching transistor.

[0149] In some embodiments of the present invention, reference is made to Figure 3 According to the primary current I pr Output current I sec Output voltage U0, preset power output threshold P sec_set Generating a second pulse width modulation control signal and sending it to the switching transistor includes the following steps:

[0150] Based on the output current I sec The output power P is calculated from the output voltage U0. sec ;

[0151] For output power P sec and the preset power output threshold P sec_set The power difference ΔP is obtained by subtraction. sec ;

[0152] For the primary current I pr and power difference ΔP sec The target primary current setpoint I is obtained by subtraction. pr_set_i ;

[0153] Based on the target primary current setting value I pr_set_i and the preset proportional coefficient K p Integral coefficient K i and maximum regulation limit power δP max PI control is performed to obtain the power regulation amount δP;

[0154] A second pulse width modulation control signal is generated based on the power regulation amount δP and sent to the switching transistor.

[0155] Since the power supply topology control method of the third aspect embodiment of the present invention adopts all the technical solutions of the power supply topology of the first aspect embodiment described above, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments.

[0156] According to the power supply topology control method of this embodiment, the power supply topology adopts an LLC resonant circuit, which can improve power supply efficiency. Furthermore, the LLC resonant circuit eliminates the need for output inductors and capacitors for filtering; instead, it sets the minimum operating frequency of the switching transistor by presetting the output voltage ripple coefficient. The maximum operating frequency is determined based on the minimum operating frequency and the gain curve of the LLC resonant circuit, ensuring the switching transistor operates within its normal operating frequency range. This guarantees the coating accuracy after removing the output inductor and capacitor, thereby reducing residual energy within the power supply and improving its response speed. Due to the soft-switching characteristics of the LLC resonant circuit, its minimum resonant frequency (i.e., minimum operating frequency) is higher than the maximum operating frequency of the IGBT in traditional coating power supplies. The high-frequency operation of the switching transistor in the power supply topology of this embodiment reduces the output ripple of the power supply, further improving the power supply response speed. The power supply topology control method of this invention performs constant power control through frequency modulation control within the normal operating frequency range of the switching transistor; when the output power is still greater than the maximum value of the preset power output range after the operating frequency of the switching transistor reaches the highest operating frequency within the normal operating frequency range, constant power control is performed through pulse width modulation control. The hybrid control of frequency modulation control and pulse width modulation control ensures normal output control while the switching transistor operates within the normal operating frequency range, and also improves power supply control efficiency.

[0157] Furthermore, a fourth aspect of the present invention provides a control device comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor. The processor and the memory may be connected via a bus or other means.

[0158] Memory, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. Furthermore, memory may include high-speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, memory may optionally include memory remotely located relative to the processor, and these remote memories can be connected to the processor via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0159] The non-transient software program and instructions required to implement the power topology control method of the above embodiments are stored in memory. When executed by the processor, the power topology control method of the above embodiments is executed.

[0160] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0161] Furthermore, a fifth aspect embodiment of the present invention provides a computer-readable storage medium storing computer-executable instructions that are executed by a processor or controller, for example, by a processor of the aforementioned control device, such that the processor performs the power topology control method described in the above embodiments.

[0162] It will be understood by those skilled in the art that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include computer storage media (or non-transitory media) and communication media (or transient media). As is known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, as is known to those skilled in the art, communication media typically contain computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0163] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A power supply topology, characterized in that, include: An LLC resonant circuit includes a chopper circuit, three resonant inductors, three resonant capacitors, a transformer circuit, and a rectifier circuit. The chopper circuit has a first DC voltage input terminal and a second DC voltage input terminal, which share a common DC voltage input, as well as a first DC voltage output terminal, a second DC voltage output terminal, and a third DC voltage output terminal. One end of each of the three resonant inductors is connected to the first DC voltage output terminal, the second DC voltage output terminal, and the third DC voltage output terminal, respectively. One end of each of the three resonant capacitors is connected to the other end of each of the three resonant inductors. The transformer circuit has separate... The transformer circuit includes a first transformer input terminal, a second transformer input terminal, and a third transformer input terminal, which are connected to the other ends of the three resonant capacitors, as well as a first transformer output terminal, a second transformer output terminal, and a third transformer output terminal. The rectifier circuit includes a three-phase bridge and an output resistor. The three-phase bridge has a first rectifier output terminal, a second rectifier output terminal, a first rectifier input terminal connected to the first transformer output terminal, a second rectifier input terminal connected to the second transformer output terminal, and a third rectifier input terminal connected to the third transformer output terminal. The two ends of the output resistor are respectively connected to the first rectifier output terminal and the second rectifier output terminal. The detection device is used to detect the primary current on the transformer input side of the transformer circuit, as well as the output current and output voltage of the rectifier circuit. A feedback control circuit is connected to the switching transistors of the detection device and the chopper circuit, respectively. The feedback control circuit is used to perform constant current control or constant power control through frequency modulation control based on the primary current, the output current, and the output voltage within the normal operating frequency range of the switching transistor. It is also used to perform constant current control or constant power control through pulse width modulation control when the output current or output power is still greater than the maximum value of the corresponding preset output range after the operating frequency of the switching transistor reaches the highest operating frequency within the normal operating frequency range. The lowest operating frequency within the normal operating frequency range is obtained based on a preset output voltage ripple coefficient, and the highest operating frequency is obtained based on the lowest operating frequency and the gain curve of the LLC resonant circuit.

2. The power supply topology according to claim 1, characterized in that, The detection device includes: A first current sensor is used to detect the primary current; A second current sensor is used to detect the output current; A voltage sampling circuit is used to detect the output voltage.

3. The power supply topology according to claim 1, characterized in that, The constraint formula for the minimum operating frequency is: Wherein, f1 is the lowest operating frequency, a is the preset output voltage ripple coefficient, L r L is the inductance of the resonant inductor r C is the capacitance of the resonant capacitor The constraint formula for the highest operating frequency is: f2 = 3f1, where f2 is the highest operating frequency and f1 is the lowest operating frequency. The highest operating frequency is obtained based on the lowest operating frequency and the gain curve of the LLC resonant circuit.

4. A control method for a power supply topology, characterized in that, Applied to the power topology as described in any one of claims 1 to 3, the control method for the power topology includes the following steps: Obtain the primary current, the output current, and the operating frequency of the switching transistor in the chopper circuit; If the operating frequency is within the normal operating frequency range, a first frequency modulation control signal is generated based on the primary current, the output current, and the preset current output threshold and sent to the switching transistor to adjust the operating frequency of the switching transistor within the normal operating frequency range, so that the output current is within the preset current output range, where the current output range characterizes the error range of the current output threshold. If the output current is still greater than the maximum value of the preset current output range after the operating frequency reaches the maximum operating frequency, a first pulse width modulation control signal is generated based on the primary current, the output current, and the preset current output threshold and sent to the switching transistor, so as to reduce the duty cycle so that the output current is within the preset current output range.

5. The control method for the power supply topology according to claim 4, characterized in that, The step of generating a first frequency modulation control signal based on the primary current, the output current, and a preset current output threshold, and sending it to the switching transistor, includes the following steps: The current difference is obtained by subtracting the output current from the preset current output threshold. The target primary current setting value is obtained by subtracting the primary current and the current difference. Based on the target primary current setting value, as well as the preset proportional coefficient, integral coefficient, and maximum adjustment limit current, PI control is performed to obtain the current adjustment amount; The first frequency modulation control signal is generated based on the current adjustment amount and sent to the switching transistor.

6. The control method for the power supply topology according to claim 4, characterized in that, The step of generating a first pulse width modulation control signal based on the primary current, the output current, and the preset current output threshold, and sending it to the switching transistor, includes the following steps: The current difference is obtained by subtracting the output current from the preset current output threshold. The target primary current setting value is obtained by subtracting the primary current and the current difference. Based on the target primary current setting value, as well as the preset proportional coefficient, integral coefficient, and maximum adjustment limit current, PI control is performed to obtain the current adjustment amount; The first pulse width modulation control signal is generated based on the current regulation amount and sent to the switching transistor.

7. A control method for a power supply topology, characterized in that, Applied to the power topology as described in any one of claims 1 to 3, the control method for the power topology includes the following steps: Obtain the primary current, the output current, the output voltage, and the operating frequency of the switching transistor in the chopper circuit; If the operating frequency is within the normal operating frequency range, a second frequency modulation control signal is generated based on the primary current, the output current, the output voltage, and the preset power output threshold and sent to the switching transistor to adjust the operating frequency of the switching transistor within the normal operating frequency range, so that the output power of the rectifier circuit is within the preset power output range, wherein the power output range characterizes the error range of the power output threshold. If the output power is still greater than the maximum value of the preset power output range after the operating frequency reaches the maximum operating frequency, a second pulse width modulation control signal is generated based on the primary current, the output current, the output voltage, and the preset power output threshold and sent to the switching transistor, so as to reduce the duty cycle so that the output power is within the preset power output range.

8. The control method for the power supply topology according to claim 7, characterized in that, The step of generating a second frequency modulation control signal based on the primary current, the output current, the output voltage, and a preset power output threshold, and sending it to the switching transistor, includes the following steps: The output power is calculated based on the output current and the output voltage. The power difference is obtained by subtracting the output power from the preset power output threshold. The target primary current setting value is obtained by subtracting the primary current and the power difference. Based on the target primary current setting value, as well as the preset proportional coefficient, integral coefficient, and maximum adjustment limit power, PI control is performed to obtain the power adjustment amount; The second frequency modulation control signal is generated based on the power adjustment amount and sent to the switching transistor.

9. The control method for the power supply topology according to claim 7, characterized in that, The step of generating a second pulse width modulation control signal based on the primary current, the output current, the output voltage, and the preset power output threshold, and sending it to the switching transistor, includes the following steps: The output power is calculated based on the output current and the output voltage. The power difference is obtained by subtracting the output power from the preset power output threshold. The target primary current setting value is obtained by subtracting the primary current and the power difference. Based on the target primary current setting value, as well as the preset proportional coefficient, integral coefficient, and maximum adjustment limit power, PI control is performed to obtain the power adjustment amount; The second pulse width modulation control signal is generated based on the power adjustment amount and sent to the switching transistor.

10. A computer-readable storage medium storing computer-executable instructions, characterized in that, The computer-executable instructions are used to execute the control method for the power topology as described in any one of claims 4 to 9.

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