Current-type resonant conversion circuit, control method thereof, and electronic equipment

Abstract

This application discloses a current-type resonant converter circuit and its control method and electronic device. The control method of the current-type resonant converter circuit includes: acquiring a resonant electrical signal and an output current; obtaining proportional-integral control parameters, an upper limit value for integral output, and a lower limit value for integral output using the comparison result between a preset reference voltage and a rated output voltage and the output current; obtaining a control output signal using the proportional-integral control parameters, the upper limit value for integral output, and the lower limit value for integral output; performing slope compensation on the control output signal using a set slope compensation slope to obtain a feedback adjustment signal; generating a drive control signal using the feedback adjustment signal and the resonant electrical signal; and adjusting the switching state of the switching circuit using the drive control signal to regulate the output current and / or output voltage. Through the above methods, the control method of the current-type resonant converter circuit of this application can obtain a more stable voltage output and a faster dynamic response.

Description

Technical Field

[0001] This application relates to the field of circuit control technology, and in particular to current-mode resonant converter circuits and their control methods, and electronic equipment. Background Technology

[0002] With the rapid development of science and technology, switching power supply technology is being used more and more widely in various fields. Especially in high-power, high-efficiency, and small-size applications, LLC (containing an additional inductor L, i.e., inductance, along with two other components, inductor L and capacitor C, i.e., capacitor) resonant converters have attracted much attention due to their unique advantages.

[0003] However, with the diversified needs of modern power electronic devices, higher requirements are being placed on the voltage output range of switching power supplies. Especially in high-power applications, such as on-board chargers and laser power supplies, resonant converters in related technologies have certain limitations in terms of wide voltage output and control details. Different output voltages have different loop characteristics under different loads, making loop compensation very difficult. Summary of the Invention

[0004] The main technical problem addressed by this application is to provide a current-type resonant converter circuit and its control method and electronic equipment, which can solve the limitations of existing resonant converters in terms of wide voltage output and control details, as well as the difficulty of loop compensation.

[0005] To solve the above-mentioned technical problems, one technical solution adopted in this application is: providing a control method for a current-type resonant converter circuit. The current-type resonant converter circuit includes a switching adjustment circuit, a resonant circuit, and an adjustment output circuit. The switching adjustment circuit is coupled to the resonant circuit and is used for coupling with a power supply circuit. The resonant circuit is coupled to the adjustment output circuit. The control method for the current-type resonant converter circuit includes: acquiring the resonant electrical signal of the resonant circuit and the output current of the adjustment output circuit; obtaining proportional-integral control parameters, an upper limit value of integral output, and a lower limit value of integral output using the comparison result between a preset reference voltage and the rated output voltage of the current-type resonant converter circuit and the output current; obtaining a control output signal using the proportional-integral control parameters, the upper limit value of integral output, and the lower limit value of integral output; performing slope compensation on the control output signal using a set slope compensation slope to obtain a feedback adjustment signal; generating a drive control signal using the feedback adjustment signal and the resonant electrical signal; and sending the drive control signal to the switching adjustment circuit to adjust the switching state of the switching adjustment circuit and regulate the output current and / or the output voltage of the adjustment output circuit.

[0006] The steps of obtaining proportional-integral control parameters, integral output upper limit, and integral output lower limit using the comparison result between the preset reference voltage and the rated output voltage of the current-type resonant converter circuit and the output current include: when the comparison result is that the preset reference voltage is equal to the rated output voltage, obtaining the first proportional-integral control parameter, the first integral output upper limit, and the first integral output lower limit using the output current; and obtaining the control output signal using the proportional-integral control parameter, the integral output upper limit, and the integral output lower limit includes: obtaining the control output signal using the first proportional-integral control parameter, the first integral output upper limit, and the first integral output lower limit.

[0007] The first proportional-integral control parameter includes a first proportional parameter and a first integral parameter. The steps to obtain the first proportional-integral control parameter using the output current include: multiplying the output current by the product of the first proportional conversion factor and adding the proportional bias parameter to obtain the first proportional parameter; and multiplying the output current by the product of the first integral conversion factor and adding the integral bias parameter to obtain the first integral parameter.

[0008] The steps of obtaining proportional-integral control parameters, an upper limit for integral output, and a lower limit for integral output using the comparison result between the preset reference voltage and the rated output voltage of the current-type resonant converter circuit and the output current include: when the comparison result is that the preset reference voltage is less than the rated output voltage, obtaining the second proportional-integral control parameter using the output current; acquiring the output voltage, the first upper limit for integral output, the first lower limit for integral output, the first upper limit fitting parameter, and the first lower limit fitting parameter; obtaining the second upper limit for integral output and the second lower limit for integral output using the first difference between the preset reference voltage and the rated output voltage, the first upper limit for integral output, the first lower limit for integral output, the first upper limit fitting parameter, and the first lower limit fitting parameter; and obtaining the control output signal using the proportional-integral control parameters, the upper limit for integral output, and the lower limit for integral output includes: detecting whether the output voltage is greater than the second difference between the preset reference voltage and the first voltage value of one step; if the output voltage is greater than the second difference, obtaining the control output signal using the second proportional-integral control parameters, the second upper limit for integral output, and the second lower limit for integral output.

[0009] The steps of obtaining the second integral output upper limit and the second integral output lower limit by subtracting the rated output voltage from the preset reference voltage, the first integral output upper limit, the first integral output lower limit, the first upper limit fitting parameter, and the first lower limit fitting parameter include: obtaining the second integral output upper limit by subtracting the first upper limit fitting parameter multiplied by the first difference from the first integral output upper limit; and obtaining the second integral output lower limit by subtracting the first lower limit fitting parameter multiplied by the first difference from the first integral output lower limit.

[0010] The control method for the current-mode resonant converter circuit further includes: if the output voltage is less than or equal to the second difference, returning to the step of obtaining the second proportional-integral control parameter using the output current.

[0011] Among them, the first upper limit fitting parameter and the first lower limit fitting parameter are positively correlated with the control interruption frequency.

[0012] The steps for obtaining proportional-integral (PI) control parameters, an upper limit for integral output, and a lower limit for integral output using the comparison result between the preset reference voltage and the rated output voltage of the current-type resonant converter circuit, and the output current, include: when the comparison result shows that the preset reference voltage is greater than the rated output voltage, obtaining a third PI control parameter using the output current; acquiring the output voltage, a first upper limit for integral output, a first lower limit for integral output, a second upper limit fitting parameter, and a second lower limit fitting parameter; obtaining a third upper limit for integral output and a third lower limit for integral output using a first difference between the preset reference voltage and the rated output voltage, a first upper limit for integral output, a first lower limit for integral output, a second upper limit fitting parameter, and a second lower limit fitting parameter; and obtaining a control output signal using the PI control parameters, the upper limit for integral output, and the lower limit for integral output, including: detecting whether the output voltage is greater than a third difference between the preset reference voltage and a second voltage value; if the output voltage is greater than the third difference, obtaining a control output signal using the third PI control parameters, the third upper limit for integral output, and the third lower limit for integral output.

[0013] The steps of obtaining the third integral output upper limit and the third integral output lower limit by subtracting the rated output voltage from the preset reference voltage, the first integral output upper limit, the first integral output lower limit, the second upper limit fitting parameter, and the second lower limit fitting parameter include: obtaining the third integral output upper limit by subtracting the first integral output upper limit from the product of the second upper limit fitting parameter and the first difference; and obtaining the third integral output lower limit by subtracting the first integral output lower limit from the product of the second lower limit fitting parameter and the first difference.

[0014] If the output voltage is less than or equal to the third difference, return to the step of obtaining the third proportional-integral control parameter using the output current.

[0015] The switching adjustment circuit includes a first switching sub-circuit and a second switching sub-circuit. The drive control signal includes a first drive signal and a second drive signal. The step of obtaining a feedback adjustment signal by slope compensation of the control output signal using a set slope compensation slope includes: in the first half-signal cycle of each drive control signal, in response to the second drive signal adjusting from a first level to a second level, delaying for a set time to adjust the first drive signal from a second level to a first level; delaying for a set time or simultaneously using a set slope compensation slope to slope compensation of the control output signal to obtain a feedback adjustment signal; the step of generating a drive control signal using the feedback adjustment signal and the resonant electrical signal includes: in the feedback adjustment... When the amplitude of the signal is less than or equal to the resonant electrical signal, the first driving signal is adjusted from the first level to the second level; in the second half of the signal cycle of each driving control signal, the first driving signal of each first half of the signal cycle is copied to obtain the second driving signal; the driving control signal is sent to the switching adjustment circuit to adjust the switching state of the switching adjustment circuit, and the steps of adjusting the output current and / or adjusting the output voltage of the output circuit include: sending the first driving signal and the second driving signal to the first switching sub-circuit and the second switching sub-circuit respectively to adjust the switching state of the first switching sub-circuit and the second switching sub-circuit respectively, and adjusting the output current and / or adjusting the output voltage of the output circuit.

[0016] The step of obtaining proportional-integral control parameters, integral output upper limit, and integral output lower limit by comparing the preset reference voltage with the rated output voltage of the current-type resonant converter circuit and the output current includes, before: receiving program control instructions input by the host computer or user; and setting or adjusting the preset reference voltage based on the program control instructions.

[0017] To solve the above-mentioned technical problems, another technical solution adopted in this application is: to provide a current-type resonant converter circuit, wherein the current-type resonant converter circuit includes a switching adjustment circuit, a resonant circuit, an adjustment output circuit, and a main control circuit, wherein the switching adjustment circuit is coupled to the resonant circuit and is used to be coupled to the power supply circuit, and the resonant circuit is coupled to the adjustment output circuit; wherein the main control circuit is coupled to the switching adjustment circuit, the resonant circuit, and the adjustment output circuit, so as to control the switching adjustment circuit using the control method of the current-type resonant converter circuit as described in any of the above claims.

[0018] To solve the above-mentioned technical problems, another technical solution adopted in this application is: to provide an electronic device, wherein the electronic device includes a housing and a current-mode resonant converter circuit connected to the housing; wherein the current-mode resonant converter circuit is the current-mode resonant converter circuit as described above.

[0019] The beneficial effects of this application are as follows: Unlike the prior art, the control method of the current-type resonant converter circuit provided in this application obtains the resonant electrical signal and the output current, and uses the comparison result between the preset reference voltage and the rated output voltage and the output current to obtain proportional-integral control parameters, the upper limit value of the integral output, and the lower limit value of the integral output. Then, the control output signal is obtained using the proportional-integral control parameters, the upper limit value of the integral output, and the lower limit value of the integral output. The control output signal is slope-compensated by setting a slope compensation slope to obtain a feedback adjustment signal. The feedback adjustment signal and the resonant electrical signal are used to generate a drive control signal, which is used to adjust the switching state of the switching circuit to regulate the output current and / or output voltage. This allows for different drive control signals to be obtained in response to different comparison results between the preset reference voltage and the rated output voltage, i.e., the preset reference voltage is equal to the rated output voltage, the preset reference voltage is greater than the rated output voltage, and the preset reference voltage is less than the rated output voltage. This allows for the adjustment of the output voltage, thereby meeting the power supply requirements of different voltage ranges. Especially when the current-type resonant converter circuit needs to operate at a non-rated output voltage, it can still ensure a more stable voltage output, and the dynamic response is faster, with a wider range of applications. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0021] Figure 1 This is a flowchart illustrating the first embodiment of the control method for the current-mode resonant converter circuit of this application;

[0022] Figure 2 This is a schematic diagram of the structure of the first embodiment of the current-mode resonant converter circuit of this application;

[0023] Figure 3 This is a flowchart illustrating the second embodiment of the control method for the current-mode resonant converter circuit of this application;

[0024] Figure 4 This is a schematic diagram of a specific embodiment of the current-mode resonant converter circuit of this application;

[0025] Figure 5 yes Figure 4 Schematic diagrams of the waveforms of various signals in a medium-current resonant converter circuit;

[0026] Figure 6 This is a flowchart illustrating the third embodiment of the control method for the current-mode resonant converter circuit of this application;

[0027] Figure 7 yes Figure 6 A flowchart illustrating an embodiment of S52;

[0028] Figure 8 This is a flowchart illustrating the fourth embodiment of the control method for the current-mode resonant converter circuit of this application;

[0029] Figure 9 yes Figure 8 A flowchart illustrating an embodiment of S64;

[0030] Figure 10 This is a flowchart illustrating the fifth embodiment of the control method for the current-mode resonant converter circuit of this application;

[0031] Figure 11 yes Figure 10 A flowchart illustrating an embodiment of S74;

[0032] Figure 12 This is a schematic diagram of one embodiment of the electronic device of this application. Detailed Implementation

[0033] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] The terms "first," "second," and "third" in this application are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movements between components in a specific orientation (as shown in the figures). If the specific orientation changes, the directional indications also change accordingly. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0035] In this document, the term "implementation" means that a specific feature, structure, or characteristic described in connection with an implementation may be included in at least one implementation of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same implementation, nor is it a separate or alternative implementation mutually exclusive with other implementations. It will be explicitly and implicitly understood by those skilled in the art that the implementations described herein can be combined with other implementations.

[0036] The present application will now be described in detail with reference to the accompanying drawings and embodiments.

[0037] Please refer to Figure 1 and Figure 2 ,in, Figure 1 This is a flowchart illustrating the first embodiment of the control method for the current-mode resonant converter circuit of this application. Figure 2 This is a schematic diagram of the structure of a first embodiment of the current-mode resonant converter circuit of this application. Specifically, it may include the following steps:

[0038] S11: Obtain the resonant electrical signal of the resonant circuit and adjust the output current of the output circuit.

[0039] It is understandable that the control method of the first current-mode resonant converter circuit 20 in this embodiment is specifically applied to, for example... Figure 2 The first current-mode resonant converter circuit 20 shown includes a first switching adjustment circuit 21, a first resonant circuit 22, a first adjustment output circuit 23, and a first main control circuit 24. The first switching adjustment circuit 21 is coupled to the first resonant circuit 22 and is used to couple with the power supply circuit 101. The first resonant circuit 22 is coupled to the first adjustment output circuit 23. The first main control circuit 24 is coupled to the first switching adjustment circuit 21, the first resonant circuit 22, and the first adjustment output circuit 23 to control the first switching adjustment circuit 21 using the control method of the first current-mode resonant converter circuit 20 described herein.

[0040] It is worth noting that the power supply circuit 101 can specifically be any reasonable DC or AC power source such as a battery, DC regulator, photovoltaic power supply, energy storage power supply, grid power supply, photovoltaic power supply, or independent generator, or it can be a power regulation circuit that receives and converts and regulates the power source of the battery, DC regulator, photovoltaic power supply, energy storage power supply, grid power supply, photovoltaic power supply, independent generator, or other reasonable upstream power source to obtain DC or AC power output. This embodiment does not limit this.

[0041] Furthermore, the term "coupled" in this document refers to any direct or indirect connection. Therefore, if the document describes a first circuit coupled to a second circuit, it means that the first circuit can be directly connected to the second circuit via electrical connection or signal connection methods such as wireless transmission or optical transmission, or indirectly connected to the second circuit via other circuits or connection methods via electrical connection or signal connection.

[0042] Specifically, the first main control circuit 24 is used to sample and obtain the resonant electrical signal from the first resonant circuit 22, and to sample and obtain the output current of the first regulating output circuit 23 that is output to the back-end signal function circuit.

[0043] It is worth noting that the signal function circuit is coupled to the first regulating output circuit 23. It can be understood as a load circuit that operates using the power supply output of the first current-type resonant converter circuit 20, or as the back-end function circuit of the first current-type resonant converter circuit 20, in order to further realize one or more of any reasonable signal functions such as voltage conversion, analog-to-digital conversion or power amplification. This application does not limit it in this regard.

[0044] S12: The proportional-integral control parameters, the upper limit of integral output, and the lower limit of integral output are obtained by comparing the preset reference voltage with the rated output voltage of the current-type resonant converter circuit and the output current.

[0045] The first main control circuit 24 is also used to compare the preset reference voltage with the rated output voltage of the first current-type resonant converter circuit 20 to obtain the comparison result of the voltage amplitude between the preset reference voltage and the rated output voltage, that is, to determine whether the current preset reference voltage is equal to, greater than or less than the rated output voltage.

[0046] It is worth noting that the rated output voltage refers to the apparent power value of the secondary circuit supplied by the discharge coil under the rated secondary voltage and with the rated secondary load or the specified power factor. It can also be understood as the optimal output voltage of the first current-type resonant converter circuit 20 during long-term normal operation. The rated voltage is also called the nominal voltage.

[0047] In addition, the preset reference voltage can be understood as the target power supply output voltage value set according to the current power supply demand. That is, the output voltage of the first regulating output circuit 23 needs to be stabilized at the target power supply output voltage value or within the error threshold range based on the target power supply output voltage value through the control method of the first current-type resonant converter circuit 20 in this article, so as to ensure a better power supply effect.

[0048] It should be noted that, in most cases, i.e., under normal operating conditions, the first current-type resonant converter circuit 20 operates at its rated output voltage, and the preset reference voltage is the rated output voltage. However, under certain special operating conditions, or when the state of the downstream load circuit or signal function circuit changes, other power supply requirements may exist. That is, the preset reference voltage may be greater than or less than the rated output voltage, and the output voltage may not be the rated output voltage, while maintaining output voltage stability. Therefore, to better meet different power supply requirements, different control strategies need to be adopted for different comparison results between the preset reference voltage and the rated output voltage.

[0049] Specifically, the first main control circuit 24 is also used to obtain proportional-integral control parameters, an upper limit value for integral output, and a lower limit value for integral output based on the comparison result between the current preset reference voltage and the rated output voltage, using the output current.

[0050] Different comparison results between the preset reference voltage and the rated output voltage will correspond to different proportional-integral control parameters, upper limit of integral output, and lower limit of integral output.

[0051] It's worth noting that the proportional-integral (PI) controller parameters consist of a proportional gain (Kp) and an integral time (Ti). The proportional gain (Kp) is the coefficient used by the controller to correct errors, while the integral time (Ti) is the time constant of the controller's integral component, also known as the integral saturation time. A larger proportional gain (Kp) results in a stronger corrective effect from the controller, but it can also lead to instability. Conversely, a larger integral time (Ti) increases the stability of the control system, but excessively large integral times can also cause instability.

[0052] Proportional (P) control: A proportional controller is essentially an amplifier with adjustable gain, and its output is proportional to the input error signal. A larger proportional gain (Kp) results in stronger amplification and a faster system response, but may cause system oscillations. A drawback of proportional control is the presence of steady-state error, meaning that an error persists even after the system reaches steady state.

[0053] Integral (I) control: Integral action is designed to eliminate steady-state error in an automatic control system. It adjusts the controller output by accumulating the error signal. Over time, the integral action gradually eliminates the error, thus achieving zero steady-state error control. The longer the integral time, the weaker the integral action; conversely, the shorter the integral time, the stronger the integral action.

[0054] Methods for tuning PI control parameters:

[0055] Trial and error method: This is a commonly used tuning method. By gradually adjusting the proportional and integral parameters and observing the system response, a satisfactory control effect is found. The trial and error method is simple and easy to implement, but it requires a certain amount of experience and patience.

[0056] Model-based approach: By analyzing the mathematical model of the system and using methods such as Laplace transform, suitable PI parameters are designed. This method requires in-depth knowledge of control system theory, but it can more accurately meet the system's performance requirements.

[0057] Furthermore, the upper limit of integral output usually refers to the upper limit of the integral variable in an integral operation. In mathematical and engineering calculations, the upper limit function of integral is an important concept. Suppose that the function y=f(x) is integrable on the interval [a,b], and for any x∈[a,b], y=f(x) is also continuous and integrable on [a,x], then Φ(x)=∫(a,x)f(t)dt is called a definite integral function with a variable upper limit, or simply the upper limit function of integral.12 The lower limit of integral output refers to the function value corresponding to the lower limit of integration in an integral operation. In this paper, the upper and lower limits of integral output can actually be understood as the upper and lower limits of the proportional parameter in the proportional-integral control parameters.

[0058] S13: The control output signal is obtained by using the proportional-integral control parameters, the upper limit of the integral output, and the lower limit of the integral output.

[0059] After obtaining the proportional-integral control parameters, the upper limit of the integral output, and the lower limit of the integral output, the first main control circuit 24 can use a PI controller or a set calculation rule to calculate the control output signal.

[0060] It's worth noting that the proportional-integral (PI) controller is one of the commonly used control algorithms in automatic control systems. It reduces the steady-state error and improves the response speed by combining proportional and integral actions. To implement a PI controller, it's necessary to set the proportional gain (Kp) and integral gain (Ki), and determine the upper and lower limits of the integral output to prevent integral saturation. The following are the basic steps for calculating the control output signal using these parameters:

[0061] Working principle of a PI controller:

[0062] 1. Measurement error: First, calculate the error at the current time e(t)=r(t)-y(t), where r(t) is the reference input (set value) and y(t) is the actual output (feedback value).

[0063] 2. Proportional part: Calculate the proportional term P=Kp*e(t) based on the current error.

[0064] 3. Integral part: Accumulate past errors and calculate the integral term I(t).

[0065] That is, I(t) = I(t - 1) + Ki * e(t) * Δt, where Δt:

[0066] If I(t) > I_max, then set I(t) = I_max.

[0067] If I(t) < I_min, then set I(t) = I_min.

[0068] 4. Control output: The final control output u(t) is the sum of the proportional term and the integral term,

[0069] That is, u(t) = P + I(t).

[0070] 5. Apply the control output: Apply the obtained control output u(t) to the controlled object, such as adjusting the valve opening, motor speed, etc.

[0071] S14: Use the set ramp compensation slope to perform ramp compensation on the control output signal to obtain a feedback adjustment signal.

[0072] Furthermore, the first main control circuit 24 performs ramp compensation on the control output signal by using the set ramp compensation slope to generate a feedback adjustment signal.

[0073] It should be noted that this ramp compensation is a control technique used to improve the stability of the system and reduce the steady-state error. By superimposing a ramp signal with a controllable slope on the set voltage signal, the dynamic response characteristics of the system can be changed. Among them, the first ramp compensation slope refers to the slope parameter used for ramp compensation. This slope can be adjusted according to the needs of the system to achieve the optimal compensation effect.

[0074] S15: Generate a drive control signal by using the feedback adjustment signal and the resonant electrical signal.

[0075] Specifically, the first main control circuit 24 compares the feedback adjustment signal with the resonant electrical signal to generate a drive control signal based on the difference between the two.

[0076] S16: Send the drive control signal to the switch adjustment circuit to adjust the switch state of the switch adjustment circuit and regulate the output current and / or the output voltage of the adjustment output circuit.

[0077] The first main control circuit 24 is also used to send a drive control signal to the first switch adjustment circuit 21, so that the first switch adjustment circuit 21 triggers the internal switch tube to turn on or off under the action of the first switch adjustment circuit 21, so as to change the switching state and thereby adjust the output current and / or the output voltage of the first adjustment output circuit 23, so that the output current and / or output voltage are as close as possible to the desired set value, i.e. the preset reference voltage, and stabilized within the preset reference voltage, or within the error threshold range based on the preset reference voltage, so as to meet the current power supply requirements.

[0078] The above solution obtains different drive control signals in response to different comparison results between the preset reference voltage and the rated output voltage, namely, the preset reference voltage is equal to the rated output voltage, the preset reference voltage is greater than the rated output voltage, and the preset reference voltage is less than the rated output voltage, so as to adjust the output voltage and meet the power supply requirements of different voltage ranges. In particular, when the first current-type resonant converter circuit 20 needs to operate at a non-rated output voltage, it can still ensure a more stable voltage output, and the dynamic response is faster and the application range is wider.

[0079] In some embodiments, the drive control signal may be one or more of any reasonable control signal such as PWM (Pulse Width Modulation) signal or PFM (Pulse Frequency Modulation) signal, and this application does not limit it.

[0080] In some embodiments, the first main control circuit 24 may specifically include any reasonable circuit unit with signal processing function, such as a control chip, an MCU (Micro Controller Unit) circuit, a CPU (Central Processing Unit), a microcontroller, a field-programmable gate array, a programmable logic device, a discrete gate or transistor logic device, or discrete hardware. This application does not limit this.

[0081] Furthermore, in one embodiment, the first main control circuit 24 is specifically used for communication connection with a host computer, or includes a program programming sub-circuit, and may further include, before the above S12: receiving program control instructions input by the host computer or user; setting or adjusting a preset reference voltage based on the program control instructions.

[0082] Understandably, the first main control circuit 24 can also receive program control commands sent by the host computer according to the current power supply requirements, or program control commands input by the user through the program programming sub-circuit, so as to set a preset reference voltage or adjust the preset reference voltage according to the program control commands, thereby effectively meeting the power supply requirements under different working conditions or different load states using the preset reference voltage.

[0083] Please see Figure 3 and Figure 4 ,in, Figure 3 This is a flowchart illustrating the second embodiment of the control method for the current-mode resonant converter circuit of this application. Figure 4 This is a schematic diagram of a specific embodiment of the current-mode resonant converter circuit of this application. The control method of the current-mode resonant converter circuit in this embodiment is... Figure 1 A detailed implementation flowchart of the control method for the current-mode resonant converter circuit is shown, which specifically includes the following steps:

[0084] S31: Obtain the resonant electrical signal of the resonant circuit and adjust the output current of the output circuit.

[0085] S32: The proportional-integral control parameters, the upper limit of integral output, and the lower limit of integral output are obtained by comparing the preset reference voltage with the rated output voltage of the current-type resonant converter circuit and the output current.

[0086] S33: The control output signal is obtained by using the proportional-integral control parameters, the upper limit of the integral output, and the lower limit of the integral output.

[0087] Among them, S31, S32 and S33 are respectively with Figure 1 S11, S12 and S13 are the same. Please refer to the textual descriptions of S11, S12 and S13 and their related information for details. They will not be repeated here.

[0088] S34: In the first half of the signal cycle of each drive control signal, in response to the second drive signal being adjusted from the first level to the second level, the first drive signal is adjusted from the second level to the first level after a delay of a set duration.

[0089] It is understood that, in one embodiment, the second switch adjustment circuit 41 further includes a first switch sub-circuit 411 and a second switch sub-circuit 412, and the drive control signal further includes a first drive signal PWMA and a second drive signal PWMB.

[0090] For ease of understanding, such as Figure 4As shown, in a specific embodiment, taking the second current-type resonant converter circuit 40 as an example of an LLC resonant converter topology, the second current-type resonant converter circuit 40 specifically includes a second switching adjustment circuit 41, a second resonant circuit 42, a second adjustment output circuit 43, a second main control circuit 44, a resonant current integration circuit 45, a power factor correction circuit 46, and a switching freewheeling circuit 47; the second switching adjustment circuit 41 includes a first switching sub-circuit 411 and a second switching sub-circuit 412, the second adjustment output circuit 43 includes an isolation transformer 431, a rectifier circuit 432, and a regulated output circuit 433, and the second main control circuit 44 includes a first proportional filter correction sub-circuit 441, a second proportional filter correction sub-circuit 442, a third proportional filter correction sub-circuit 443, and a control sub-circuit 444; the first switching sub-circuit... Circuit 411 includes a first switching transistor Q1, and the second switching sub-circuit 412 includes a second switching transistor Q2; the switching freewheeling circuit 47 includes a first freewheeling resistor Rc1, a second freewheeling resistor Rc2, a first freewheeling capacitor C1, a second freewheeling capacitor C2, a first diode D1, and a second diode D2; the second resonant circuit 42 includes a first resonant capacitor Cr1, a second resonant capacitor Cr2, and a resonant inductor Lr; the resonant current integrating circuit 45 includes a current transformer CT and an integrating sampling capacitor CJ; the isolation transformer 431 includes a primary winding 4311 and a secondary winding 4312, and the secondary winding 4312 further includes a first sub-secondary winding 43121 and a second sub-secondary winding 43122; the rectifier circuit 432 includes a third diode D3 and a fourth diode D4; and the regulated output circuit 433 includes a regulated resistor Ro and a regulated capacitor Co.

[0091] The power factor correction circuit 46 is coupled to the power supply circuit 101 to receive the AC input signal Vac from the power supply circuit 101 and convert the input AC input signal into a smooth and highly stable power input signal through electronic control technology.

[0092] The second switching adjustment circuit 41 is used to receive the power input signal and convert it into a first AC signal; the second resonant circuit 42 receives the first AC signal sent by the second switching adjustment circuit 41 and adjusts the first AC signal into a resonant electrical signal Vcs; the second adjustment output circuit 43 is used to couple with the back-end signal function circuit 102 to receive the resonant electrical signal Vcs sent by the second resonant circuit 42 and convert the resonant electrical signal Vcs into a power supply output signal to provide to the back-end signal function circuit 102.

[0093] In some embodiments, the output current Iout and output voltage Vo of the second regulating output circuit 43 in this document are the current and voltage of the power supply output signal; or, the first filtered signal and the third filtered signal are obtained by filtering and correcting the current and voltage of the power supply output signal sequentially through the first proportional filter correction sub-circuit 441 and the third proportional filter correction sub-circuit 443, respectively. The specific application scenario is determined by the actual application scenario, and this application does not limit it.

[0094] In some embodiments, the resonant electrical signal Vcs is the resonant capacitor voltage in the second resonant circuit 42; or, it is the second filtered signal obtained by sequentially filtering and correcting the resonant capacitor voltage through the second proportional filter correction sub-circuit 442; or, it is the integrated voltage signal obtained by integrating and adjusting the resonant current signal in the second resonant circuit 42 through the resonant current integrator circuit 45; or, it is the fourth filtered signal obtained by sequentially filtering and correcting the resonant capacitor voltage through the integrated voltage signal through the second proportional filter correction sub-circuit 442. The specific application scenario is determined, and this application does not limit it.

[0095] In some embodiments, the first driving signal PWMA and the second driving signal PWMB are obtained by the control sub-circuit 444 performing corresponding data fitting and function calculations on the current and voltage of the power supply output signal and the resonant capacitor voltage; or, they are obtained by the control sub-circuit 444 performing corresponding data fitting and function calculations on the first filter signal, the second filter signal and the third filter signal; or, they are obtained by the control sub-circuit 444 performing corresponding data fitting and function calculations on the first filter signal, the fourth filter signal and the third filter signal. The specific method is determined by the actual application scenario, and this application does not limit it.

[0096] The first end of the first freewheeling resistor Rc1 is coupled to the first end of the first switch Q1, the second end of the first diode D1, and the first end of the power factor correction circuit 46. The second end of the first freewheeling resistor Rc1 is coupled to the first end of the first freewheeling capacitor C1. The second end of the first freewheeling capacitor C1 is coupled to the first end of the first diode D1, the second end of the first switch Q1, the first end of the second switch Q2, the first end of the second freewheeling resistor Rc2, and the second end of the second diode D2. The second end of the second freewheeling resistor Rc2 is coupled to the first end of the second freewheeling capacitor C2. The second end of the second freewheeling capacitor C2 is coupled to the second end of the second switch Q2, the first end of the second diode D2, and the second end of the power factor correction circuit 46. The third ends of the first switch Q1 and the second switch Q2 are coupled to the control sub-circuit 444.

[0097] The first terminal of the first resonant capacitor Cr1 is coupled to the first terminal of the first switch Q1. The second terminal of the first resonant capacitor Cr1 is coupled to the first terminal of the second resonant capacitor Cr2 and the first terminal of the current transformer CT. The second terminal of the second resonant capacitor Cr2 is coupled to the second terminal of the second switch Q2. The second terminal of the current transformer CT is coupled to the second terminal of the primary winding 4311. The first terminal of the resonant inductor Lr is coupled to the second terminal of the first switch Q1 and the first terminal of the second switch Q2. The second terminal of the resonant inductor Lr is coupled to the first terminal of the primary winding 4311. The third terminal of the current transformer CT is coupled to the first terminal of the integrating sampling capacitor CJ and the first terminal of the third proportional filter correction circuit 443. The fourth terminal of the current transformer CT is coupled to the second terminal of the integrating sampling capacitor CJ and the second terminal of the third proportional filter correction circuit 443.

[0098] The first end of the third diode D3 is coupled to the first end of the first sub-secondary winding 43121. The second end of the third diode D3 is coupled to the second end of the fourth diode D4, the first end of the voltage regulator Ro, the first end of the first proportional filter correction sub-circuit 441, the first end of the second proportional filter correction sub-circuit 442, and the first end of the signal function circuit 102. The first end of the fourth diode D4 is coupled to the second end of the second sub-secondary winding 43122. The second end of the voltage regulator Ro is coupled to the first end of the voltage regulator Co. The second end of the voltage regulator Co is coupled to the second end of the first sub-secondary winding 43121, the first end of the second sub-secondary winding 43122, the second end of the second proportional filter correction sub-circuit 442, and the second end of the signal function circuit 102. The control sub-circuit 444 is coupled to the first proportional filter correction sub-circuit 441, the second proportional filter correction sub-circuit 442, and the third proportional filter correction sub-circuit 443.

[0099] In other embodiments, the second switching adjustment circuit 41 can be any reasonable circuit form for realizing DC to AC conversion, such as a full-bridge circuit, a symmetrical half-bridge circuit, or an asymmetrical half-bridge circuit; the rectifier circuit 432 can be any reasonable circuit form for realizing AC to DC conversion, such as a full-bridge rectifier circuit 432 or a half-bridge rectifier circuit 432 composed of various switching transistors; the first sub-secondary winding 43121 and the second sub-secondary winding 43122 can be replaced by the same winding; and the second current-type resonant converter circuit 40 can adopt other reasonable topologies, which are determined by the actual application scenario, and this application does not limit them.

[0100] In some embodiments, the first switch Q1 and the second switch Q2 may be a MOSFET, a transistor, a thin-film transistor, a field-effect transistor, or any other reasonable switch, and this application does not limit this.

[0101] It is worth noting that, to distinguish the two ends of each switching transistor except for the control terminal, one terminal is referred to as the first terminal and the other as the second terminal. When each switching transistor is a bipolar junction transistor (BJT), the control terminal, i.e., the third terminal, can specifically be the base, the first terminal as the collector, and the second terminal as the emitter; or, the third terminal can specifically be the base, the first terminal as the emitter, and the second terminal as the collector.

[0102] When the switching transistors mentioned above are MOSFETs, thin-film transistors, or field-effect transistors, the third terminal can be the gate, the first terminal can be the drain, and the second terminal can be the source; or, the third terminal can also be the gate, the first terminal can be the source, and the second terminal can be the drain.

[0103] In particular, when each switching transistor is a MOSFET, a thin-film transistor, or a field-effect transistor, it can also be a composite transistor or a single transistor, which is not limited in this application.

[0104] In other embodiments, the second switch adjustment circuit 41 can be any reasonable circuit form for realizing DC to AC conversion, such as a full-bridge circuit, a symmetrical half-bridge circuit, or an asymmetrical half-bridge circuit. This application does not limit this.

[0105] Specifically, if Figure 5 As shown, Figure 5 yes Figure 4 A schematic diagram of the waveforms of each signal in the medium-current resonant converter circuit. The second main control circuit 44 is used to adjust the first drive signal PWMA from the second level to the first level during the first half signal period TQ of each drive control signal, in response to the moment when each second drive signal PWMB adjusts from the first level to the second level, with a delay of a set time ty.

[0106] The set duration ty can be understood as the on / off dead time of each switch in the second switch adjustment circuit 41, or it can be any specific duration reasonably set according to the on / off dead time, which is determined by the actual application scenario. This application does not limit it.

[0107] The first level can be a high level, and the second level can be a low level or a 0 level; or, the first level can be a low level or a 0 level, and the second level can be a high level. The specific level can be determined by the physical characteristics of each switch in the second switch adjustment circuit 41, and this application does not limit it.

[0108] S35: Delay for a set duration or simultaneously use a set slope compensation rate to perform slope compensation on the control output signal to obtain a feedback adjustment signal.

[0109] The second main control circuit 44 is also used to perform slope compensation on the control output signal using a set slope compensation slope to obtain a feedback adjustment signal when the second drive signal PWMB is adjusted from the first level to the second level; or, when the second drive signal PWMB is adjusted from the first level to the second level, after a delay of a set time ty, i.e. at the moment when the first drive signal PWMA is adjusted from the second level to the first level, to perform slope compensation on the control output signal using a set slope compensation slope to obtain a feedback adjustment signal Kt.

[0110] It is worth noting that the set slope compensation slope used by the second main control circuit 44 to perform slope compensation on the control output signal at the moment when the second drive signal PWMB is adjusted from the first level to the second level is different from the set slope compensation slope used to perform slope compensation on the control output signal at the moment when the first drive signal PWMA is adjusted from the second level to the first level. Both are negative values, with the former being greater than the latter. The specific value is determined by the actual application scenario, and this application does not limit it.

[0111] S36: When the amplitude of the feedback adjustment signal is less than or equal to the resonant electrical signal, the first drive signal is adjusted from the first level to the second level.

[0112] Furthermore, when the second main control circuit 44 detects that the amplitude of the currently acquired feedback adjustment signal Kt is less than or equal to the resonant electrical signal Vcs, it adjusts the first drive signal PWMA from the first level to the second level.

[0113] It is worth noting that the resonant electrical signal Vcs can be the resonant capacitor voltage, the resonant current, or an electrical signal after setting signal processing or function processing of the resonant current. When the resonant electrical signal Vcs is different, the corresponding set slope compensation slope is also different, and the feedback adjustment signal Kt obtained therefrom is also different. The specific determination depends on the actual application scenario, and this application does not limit it.

[0114] S37: In the second half of each drive control signal cycle, the first drive signal of each first half of the signal cycle is copied to obtain the second drive signal.

[0115] In the second half of the signal cycle TH of each drive control signal, the second main control circuit 44 can directly copy the level change of the first drive signal PWMA in the first half of the signal cycle TQ to obtain the second drive signal PWMB.

[0116] Understandably, such as Figure 5As shown, in the first half-cycle TQ of each drive control signal, the first drive signal PWMA has a first level state, that is, after a delay of a set time ty, it is adjusted from the second level state to the first level state. In the second half-cycle of each drive control signal, the first drive signal PWMA remains in the second level state. The second drive signal PWMB remains in the second level state in the first half-cycle TQ of each drive control signal. In the second half-cycle of each drive control signal, the level change state of the second drive signal PWMB is adjusted and copied to correspond to the level change state of the first drive signal PWMA in the first half-cycle TQ of each second signal cycle.

[0117] S38: Send the first driving signal and the second driving signal to the first switch sub-circuit and the second switch sub-circuit respectively, so as to adjust the switching state of the first switch sub-circuit and the second switch sub-circuit respectively, and adjust the output current and / or the output voltage of the adjustment output circuit.

[0118] Furthermore, the second main control circuit 44 sends the first driving signal PWMA and the second driving signal PWMB to the first switching sub-circuit 411 and the second switching sub-circuit 412 respectively, so that the first switching sub-circuit 411 and the second switching sub-circuit 412 change their switching states under the action of the first driving signal PWMA and the second driving signal PWMB respectively. Specifically, it can trigger the first switching transistor Q1 and the second switching transistor Q2 to turn on or off, so as to adjust the resonant electrical signal Vcs, thereby adjusting the output current Iout and / or the output voltage Vo of the second regulating output circuit 43.

[0119] Please see Figure 6 , Figure 6 This is a flowchart illustrating the third embodiment of the control method for the current-mode resonant converter circuit of this application. The control method for the current-mode resonant converter circuit in this embodiment... Figure 1 A detailed implementation flowchart of the control method for the current-mode resonant converter circuit is shown, which specifically includes the following steps:

[0120] S51: Obtain the resonant electrical signal of the resonant circuit and adjust the output current of the output circuit.

[0121] S52: When the preset reference voltage is equal to the rated output voltage, the first proportional-integral control parameter, the first integral output upper limit value, and the first integral output lower limit value are obtained by using the output current.

[0122] Specifically, when the second main control circuit 44 compares the preset reference voltage Vref with the rated output voltage Vn of the second current-type resonant converter circuit 40 and determines that the preset reference voltage Vref equals the rated output voltage Vn, it detects the value of the output current Iout and obtains the first proportional-integral control parameters through specific data fitting and function calculation based on the open-loop operation data. Furthermore, based on the open-loop operation data, it determines the first integral output upper limit value Vout_UpLim and the first integral output lower limit value Vout_DnLim of the PI controller in the second main control circuit 44.

[0123] It's worth noting that open-loop control refers to a system control method without feedback information. Once the operator starts the system and puts it into operation, the system sends the operator's commands to the controlled object all at once. Afterward, the operator cannot further control changes to the controlled object.

[0124] Data fitting refers to using an appropriate mathematical model to describe the relationships between data and minimize the error between predicted and actual values. This process typically includes steps such as data collection, data preprocessing, model selection, model training, and model validation. Data fitting has wide applications in scientific research, engineering, finance, and market analysis. The goal of data fitting is to find a function that accurately describes the trends and patterns in the data by selecting a suitable mathematical model. Common models include linear and nonlinear models. Linear models are suitable for data with linear relationships, such as linear regression, while nonlinear models are suitable for data with nonlinear relationships, such as multinomial regression and exponential regression.

[0125] S53: The control output signal is obtained by using the first proportional-integral control parameter, the first integral output upper limit value, and the first integral output lower limit value.

[0126] Furthermore, the control output signal is obtained by using a PI controller or a set calculation rule to perform corresponding calculations on the first proportional-integral control parameter, the first integral output upper limit value Vout_UpLim, and the first integral output lower limit value Vout_DnLim.

[0127] S54: The control output signal is slope compensated by setting the slope compensation rate to obtain the feedback adjustment signal.

[0128] S55: Generates drive control signals using feedback adjustment signals and resonant electrical signals.

[0129] S56: Sends the drive control signal to the switching regulation circuit to adjust the switching state of the switching regulation circuit and regulate the output current and / or the output voltage of the regulating output circuit.

[0130] Among them, S54, S55 and S56 are respectively with Figure 1 S14, S15 and S16 are the same. Please refer to S14, S15 and S16 and their related textual descriptions for details. They will not be repeated here.

[0131] Please see Figure 7 , Figure 7 yes Figure 6 A flowchart illustrating an embodiment of S52 is shown. In one embodiment, the third embodiment of the control method for the current-type resonant converter circuit of this application, in addition to including S51-S56 as described above, further includes some more specific steps. Specifically, S52 may further include the following steps:

[0132] S521: Multiply the output current by the first proportional conversion factor and add the proportional bias parameter to obtain the first proportional parameter.

[0133] Specifically, the second main control circuit 44 detects the value of the output current Iout, determines the data based on open-loop operation, and obtains the first proportional conversion coefficient Kp0 and the proportional bias parameter P0 of the PI controller through specific data fitting. Then, the first proportional parameter P1 is obtained by performing a function calculation on the output current Iout, the first proportional conversion coefficient Kp0, and the proportional bias parameter P0 using the following formula:

[0134] P1 = Iout * Kp0 + P0.

[0135] S522: Multiply the output current by the product of the first integral conversion factor and add the integral bias parameter to obtain the first integral parameter.

[0136] The second main control circuit 44 is also used to obtain the first integral conversion coefficient Ki0 and integral bias parameter I0 of the PI controller through specific data fitting, and to obtain the first integral parameter I1 by performing a function calculation on the output current Iout, the first integral conversion coefficient Ki0, and the integral bias parameter I0 using the following formula:

[0137] I1 = Iout * Ki0 + I0.

[0138] Please see Figure 8 , Figure 8 This is a flowchart illustrating the fourth embodiment of the control method for the current-mode resonant converter circuit of this application. The control method for the current-mode resonant converter circuit in this embodiment... Figure 1 A detailed implementation flowchart of the control method for the current-mode resonant converter circuit is shown, which specifically includes the following steps:

[0139] S61: Obtain the resonant electrical signal of the resonant circuit and adjust the output current of the output circuit.

[0140] Among them, S61 and Figure 1 The same applies to S11. Please refer to S11 and its related textual descriptions for details, which will not be repeated here.

[0141] S62: When the preset reference voltage is less than the rated output voltage, the second proportional-integral control parameter is obtained by using the output current.

[0142] Specifically, when the second main control circuit 44 compares the preset reference voltage Vref with the rated output voltage Vn of the second current-type resonant converter circuit 40 and determines that the preset reference voltage Vref is less than the rated output voltage Vn, it detects the value of the output current Iout and obtains the second proportional-integral control parameter by fitting specific data and calculating functions based on the data determined by open-loop operation.

[0143] Specifically, the second proportional-integral control parameter includes the second proportional parameter P2 and the second integral parameter I2. The second main control circuit 44 processes the output current Iout through specific data fitting to obtain the second proportional conversion coefficient KpUnder, the proportional bias parameter P0, the second integral conversion coefficient KiUnder, and the integral bias parameter I0 of the PI controller, which are then calculated using the following formula:

[0144] P2 = Iout * KpUnder + P0;

[0145] I2 = Iout * KiUnder + I0.

[0146] S63: Obtain the output voltage, the first integral output upper limit value, the first integral output lower limit value, the first upper limit fitting parameter, and the first lower limit fitting parameter.

[0147] The second main control circuit 44 is also used to sample and obtain the output voltage Vo of the second adjustment output circuit 43 and output it to the back-end signal function circuit 102, and determine the first integral output upper limit value Vout_UpLim, the first integral output lower limit value Vout_DnLim, the first upper limit fitting parameter Kup1 and the first lower limit fitting parameter Kdn1 of the PI controller in the second main control circuit 44 based on the open-loop operation determination data.

[0148] The first upper limit fitting parameter Kup1 and the first lower limit fitting parameter Kdn1 are obtained by fitting open-loop data and are positively correlated with the control interruption frequency.

[0149] It is worth noting that the control interruption frequency can be understood as the frequency at which the second main control circuit 44 performs corresponding data fitting, that is, the calculation frequency corresponding to calculating the first upper limit fitting parameter Kup1 and the first lower limit fitting parameter Kdn1 once at a specific time interval. Furthermore, the larger the control interruption frequency, the larger the first upper limit fitting parameter Kup1 and the first lower limit fitting parameter Kdn1; the smaller the control interruption frequency, the smaller the first upper limit fitting parameter Kup1 and the first lower limit fitting parameter Kdn1.

[0150] S64: The second integral output upper limit and the second integral output lower limit are obtained by subtracting the rated output voltage from the preset reference voltage, the first integral output upper limit, the first integral output lower limit, the first upper limit fitting parameter, and the first lower limit fitting parameter.

[0151] The second main control circuit 44 subtracts the rated output voltage Vn from the preset reference voltage Vref to obtain the first difference (Vref-Vn), and uses a specific mathematical model and calculation function to calculate the first difference (Vref-Vn), the first integral output upper limit value Vout_UpLim, the first integral output lower limit value Vout_DnLim, the first upper limit fitting parameter Kup1, and the first lower limit fitting parameter Kdn1 to obtain the second integral output upper limit value Intg_UpLim and the second integral output lower limit value Intg_DnLim.

[0152] S65: Detect whether the output voltage is greater than the second difference between the preset reference voltage and the first voltage value of one beat.

[0153] Furthermore, the second main control circuit 44 detects whether the currently acquired output voltage Vo is greater than the second difference between the preset reference voltage Vref and the first voltage value of one beat.

[0154] It is worth noting that the second main control circuit 44 actually samples and acquires the output voltage Vo of the second adjustment output circuit 43 once every specific time interval, that is, once per beat. The first voltage value of this beat is the difference between the currently acquired output voltage Vo and the output voltage Vo acquired at the previous moment, which is used to characterize the amplitude change of the output voltage Vo acquired in each beat.

[0155] If the output voltage Vo is greater than the second difference between the preset reference voltage Vref and the first voltage value of one step, then S66 is executed; if the output voltage Vo is less than or equal to the second difference between the preset reference voltage Vref and the first voltage value of one step, then S62 is executed.

[0156] S66: The control output signal is obtained by using the second proportional-integral control parameter, the upper limit of the second integral output, and the lower limit of the second integral output.

[0157] Furthermore, the control output signal is obtained by using a PI controller or a set calculation rule to perform corresponding calculations on the currently obtained second proportional-integral control parameters, the upper limit value of the second integral output Intg_UpLim, and the lower limit value of the second integral output Intg_DnLim.

[0158] S67: The control output signal is slope compensated by setting the slope compensation rate to obtain the feedback adjustment signal.

[0159] S68: Generates drive control signals using feedback adjustment signals and resonant electrical signals.

[0160] S69: Send the drive control signal to the switching regulation circuit to adjust the switching state of the switching regulation circuit and regulate the output current and / or the output voltage of the regulating output circuit.

[0161] Among them, S67, S68 and S69 are respectively with Figure 1 S14, S15 and S16 are the same. Please refer to S14, S15 and S16 and their related textual descriptions for details. They will not be repeated here.

[0162] Please see Figure 9 , Figure 9 yes Figure 8 A flowchart illustrating an embodiment of S64 is shown. In one embodiment, the fourth embodiment of the control method for the current-mode resonant converter circuit of this application, in addition to the above-described S61-S69, further includes some more specific steps. Specifically, the above-described S64 may further include the following steps:

[0163] S641: The second integral output upper limit value is obtained by subtracting the first upper limit fitting parameter multiplied by the first difference from the first integral output upper limit value.

[0164] Specifically, the second main control circuit 44 uses the following calculation formula to perform function calculations on the first integral output upper limit value Vout_UpLim, the first upper limit fitting parameter Kup1, and the first difference (Vref-Vn) to obtain the second integral output upper limit value Intg_UpLim:

[0165] Intg_UpLim=Vout_UpLim-∑(Kup1(Vref-Vn)).

[0166] S642: The second integral output lower limit value is obtained by subtracting the first lower limit fitting parameter multiplied by the first difference from the first integral output lower limit value.

[0167] The second main control circuit 44 is also used to perform function calculations on the first integral output lower limit value Vout_DnLim, the first lower limit fitting parameter Kdn1, and the first difference (Vref-Vn) using the following calculation formula to obtain the second integral output lower limit value Intg_DnLim:

[0168] Intg_DnLim = Vout_DnLim - ∑(Kdn1(Vref-Vn)).

[0169] Please see Figure 10 , Figure 10 This is a flowchart illustrating the fifth embodiment of the control method for the current-mode resonant converter circuit of this application. The control method for the current-mode resonant converter circuit in this embodiment... Figure 1 A detailed implementation flowchart of the control method for the current-mode resonant converter circuit is shown, which specifically includes the following steps:

[0170] S71: Obtain the resonant electrical signal of the resonant circuit and adjust the output current of the output circuit.

[0171] Among them, S71 and Figure 1 The same applies to S11. Please refer to S11 and its related textual descriptions for details, which will not be repeated here.

[0172] S72: When the preset reference voltage is greater than the rated output voltage, the third proportional-integral control parameter is obtained by using the output current.

[0173] Specifically, when the second main control circuit 44 compares the preset reference voltage Vref with the rated output voltage Vn of the second current-type resonant converter circuit 40 and determines that the preset reference voltage Vref is greater than the rated output voltage Vn, it detects the value of the output current Iout and obtains the third proportional-integral control parameter by fitting specific data and calculating functions based on the data determined by open-loop operation.

[0174] Specifically, the third proportional-integral control parameter includes the third proportional parameter P3 and the third integral parameter I3. The second main control circuit 44 processes the output current Iout through specific data fitting to obtain the PI controller's third proportional conversion coefficient KpOver, proportional bias parameter P0, third integral conversion coefficient KiOver, and integral bias parameter I0, which are then calculated using the following formula:

[0175] P = Iout * KpOver + P0;

[0176] I = Iout * KiOver + I0.

[0177] S73: Obtain the output voltage, the first integral output upper limit value, the first integral output lower limit value, the second upper limit fitting parameter, and the second lower limit fitting parameter.

[0178] The second main control circuit 44 is also used to sample and obtain the output voltage Vo from the second regulating output circuit 43, and determine the first integral output upper limit value Vout_UpLim, the first integral output lower limit value Vout_DnLim, the second upper limit fitting parameter Kup2, and the second lower limit fitting parameter Kdn2 of the PI controller in the second main control circuit 44 based on the open-loop operation determination data.

[0179] The second upper limit fitting parameter Kup2 and the second lower limit fitting parameter Kdn2 are obtained by fitting open-loop data and are positively correlated with the control interruption frequency.

[0180] It is worth noting that the control interruption frequency can be understood as the frequency at which the second main control circuit 44 performs corresponding data fitting, that is, the calculation frequency corresponding to calculating the second upper limit fitting parameter Kup2 and the second lower limit fitting parameter Kdn2 once at a specific time interval. Furthermore, the larger the control interruption frequency, the larger the second upper limit fitting parameter Kup2 and the second lower limit fitting parameter Kdn2; conversely, the smaller the control interruption frequency, the smaller the second upper limit fitting parameter Kup2 and the second lower limit fitting parameter Kdn2.

[0181] S74: The third integral output upper limit and the third integral output lower limit are obtained by subtracting the rated output voltage from the preset reference voltage, the first integral output upper limit, the first integral output lower limit, the second upper limit fitting parameter, and the second lower limit fitting parameter.

[0182] The second main control circuit 44 subtracts the rated output voltage Vn from the preset reference voltage Vref to obtain the first difference (Vref-Vn), and uses a specific mathematical model and calculation function to calculate the first difference (Vref-Vn), the first integral output upper limit value Vout_UpLim, the first integral output lower limit value Vout_DnLim, the second upper limit fitting parameter Kup2, and the second lower limit fitting parameter Kdn2 to obtain the third integral output upper limit value Intg_UpLim and the third integral output lower limit value Intg_DnLim.

[0183] S75: Detect whether the output voltage is greater than the third difference between the preset reference voltage and the second voltage value of one beat.

[0184] Furthermore, the second main control circuit 44 detects whether the currently acquired output voltage Vo is greater than the third difference between the preset reference voltage Vref and the second voltage value of one beat.

[0185] It is worth noting that the second main control circuit 44 actually samples and acquires the output voltage Vo of the second adjustment output circuit 43 once every specific time interval, that is, once per beat. The second voltage value of each beat is the difference between the currently acquired output voltage Vo and the output voltage Vo acquired at the previous moment, which is used to characterize the amplitude change of the output voltage Vo acquired in each beat.

[0186] If the output voltage Vo is greater than the third difference between the preset reference voltage Vref and the second voltage value of one step, then S76 is executed; if the output voltage Vo is less than or equal to the third difference between the preset reference voltage Vref and the second voltage value of one step, then S72 is executed.

[0187] S76: The control output signal is obtained by using the third proportional-integral control parameter, the upper limit of the third integral output, and the lower limit of the third integral output.

[0188] Furthermore, the control output signal is obtained by using a PI controller or the set calculation rules to perform corresponding calculations on the currently obtained third proportional-integral control parameters, the upper limit value of the third integral output Intg_UpLim, and the lower limit value of the third integral output Intg_DnLim.

[0189] S77: The control output signal is slope compensated by setting the slope compensation rate to obtain the feedback adjustment signal.

[0190] S78: Generates drive control signals using feedback adjustment signals and resonant electrical signals.

[0191] S79: Sends the drive control signal to the switching regulation circuit to adjust the switching state of the switching regulation circuit and regulate the output current and / or the output voltage of the regulating output circuit.

[0192] Among them, S77, S78 and S79 are respectively with Figure 1 S14, S15 and S16 are the same. Please refer to S14, S15 and S16 and their related textual descriptions for details. They will not be repeated here.

[0193] Please see Figure 11 , Figure 11 yes Figure 10 A flowchart illustrating an embodiment of S74 is shown. In one embodiment, the fourth embodiment of the control method for the current-type resonant converter circuit of this application, in addition to including S71-S79 as described above, further includes some more specific steps. Specifically, S74 may further include the following steps:

[0194] S741: The third integral output upper limit value is obtained by subtracting the product of the second upper limit fitting parameter and the first difference from the first integral output upper limit value.

[0195] Specifically, the second main control circuit 44 uses the following calculation formula to perform function calculations on the first integral output upper limit value Vout_UpLim, the second upper limit fitting parameter Kup2, and the first difference (Vref-Vn) to obtain the third integral output upper limit value Intg_UpLim:

[0196] Intg_UpLim=Vout_UpLim-(Kup2(Vref-Vn)).

[0197] S742: The third integral output lower limit is obtained by subtracting the product of the second lower limit fitting parameter and the first difference from the first integral output lower limit value.

[0198] The second main control circuit 44 is also used to perform a function calculation on the first integral output lower limit value Vout_DnLim, the second lower limit fitting parameter Kdn2, and the first difference (Vref-Vn) using the following calculation formula to obtain the third integral output lower limit value Intg_DnLim:

[0199] Intg_DnLim=Vout_DnLim-∑(Kdn2(Vref-Vn)).

[0200] This application also provides an electronic device, please refer to... Figure 12 , Figure 12 This is a schematic diagram of one embodiment of the electronic device of this application. In this embodiment, the electronic device 80 includes a housing 81 and a third current-mode resonant converter circuit 82 connected to the housing 81.

[0201] It should be noted that the third current-mode resonant converter circuit 82 described in this embodiment is either the first current-mode resonant converter circuit 20 or the second current-mode resonant converter circuit 40 described in any of the above embodiments. Please refer to [link / reference] for details. Figures 1-11 The relevant textual content will not be elaborated upon here.

[0202] The beneficial effects of this application are as follows: Unlike the prior art, the control method of the current-type resonant converter circuit provided in this application obtains the resonant electrical signal and the output current, and uses the comparison result between the preset reference voltage and the rated output voltage and the output current to obtain proportional-integral control parameters, the upper limit value of the integral output, and the lower limit value of the integral output. Then, the control output signal is obtained using the proportional-integral control parameters, the upper limit value of the integral output, and the lower limit value of the integral output. The control output signal is slope-compensated by setting a slope compensation slope to obtain a feedback adjustment signal. The feedback adjustment signal and the resonant electrical signal are used to generate a drive control signal, which is used to adjust the switching state of the switching circuit to regulate the output current and / or output voltage. This allows for different drive control signals to be obtained in response to different comparison results between the preset reference voltage and the rated output voltage, i.e., the preset reference voltage is equal to the rated output voltage, the preset reference voltage is greater than the rated output voltage, and the preset reference voltage is less than the rated output voltage. This allows for the adjustment of the output voltage, thereby meeting the power supply requirements of different voltage ranges. Especially when the current-type resonant converter circuit needs to operate at a non-rated output voltage, it can still ensure a more stable voltage output, and the dynamic response is faster, with a wider range of applications.

[0203] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A control method for a current-mode resonant converter circuit, the current-mode resonant converter circuit comprising a switching adjustment circuit, a resonant circuit, and an adjustment output circuit, wherein the switching adjustment circuit is coupled to the resonant circuit and is used for coupling with a power supply circuit, and the resonant circuit is coupled to the adjustment output circuit, characterized in that, The control method for the current-mode resonant converter circuit includes: Obtain the resonant electrical signal of the resonant circuit and the output current of the adjustable output circuit; The proportional-integral control parameters, the upper limit of integral output, and the lower limit of integral output are obtained by comparing the preset reference voltage with the rated output voltage of the current-type resonant converter circuit and the output current. A control output signal is obtained using the proportional-integral control parameters, the upper limit of the integral output, and the lower limit of the integral output; wherein, the step of obtaining the proportional-integral control parameters, the upper limit of the integral output, and the lower limit of the integral output using the comparison result between the preset reference voltage and the rated output voltage of the current-type resonant converter circuit and the output current includes: when the comparison result is that the preset reference voltage is equal to the rated output voltage, obtaining a first proportional-integral control parameter, a first upper limit of the integral output, and a first lower limit of the integral output using the output current; the step of obtaining the control output signal using the proportional-integral control parameters, the upper limit of the integral output, and the lower limit of the integral output includes: obtaining the control output signal using the first proportional-integral control parameter, the first upper limit of the integral output, and the first lower limit of the integral output. A feedback adjustment signal is obtained by slope compensation of the control output signal using a set slope compensation slope. The drive control signal is generated using the feedback adjustment signal and the resonant electrical signal; The drive control signal is sent to the switch adjustment circuit to adjust the switching state of the switch adjustment circuit and to regulate the output current and / or the output voltage of the adjustment output circuit.

2. The control method for the current-mode resonant converter circuit according to claim 1, characterized in that, The first proportional-integral control parameter includes a first proportional parameter and a first integral parameter. The step of obtaining the first proportional-integral control parameter using the output current includes: The first proportional parameter is obtained by multiplying the output current by the first proportional conversion factor and adding the proportional bias parameter. The first integral parameter is obtained by multiplying the output current by the first integral conversion factor and adding the integral bias parameter.

3. The control method for the current-mode resonant converter circuit according to claim 1, characterized in that, The step of obtaining the proportional-integral control parameters, the upper limit of the integral output, and the lower limit of the integral output using the comparison result between the preset reference voltage and the rated output voltage of the current-type resonant converter circuit and the output current further includes: When the comparison result indicates that the preset reference voltage is less than the rated output voltage, the second proportional-integral control parameter is obtained using the output current. Obtain the output voltage, the first integral output upper limit value, the first integral output lower limit value, the first upper limit fitting parameter, and the first lower limit fitting parameter; The second integral output upper limit and the second integral output lower limit are obtained by subtracting the first difference of the rated output voltage from the preset reference voltage, the first integral output upper limit, the first integral output lower limit, the first upper limit fitting parameter, and the first lower limit fitting parameter. The step of obtaining the control output signal using the proportional-integral control parameters, the upper limit of the integral output, and the lower limit of the integral output includes: Detect whether the output voltage is greater than the second difference between the preset reference voltage and the first voltage value at one time step; wherein, the first voltage value at one time step is the difference between the currently acquired output voltage and the output voltage acquired at the previous time step; If the output voltage is greater than the second difference, the control output signal is obtained using the second proportional-integral control parameter, the second integral output upper limit, and the second integral output lower limit.

4. The control method for the current-mode resonant converter circuit according to claim 3, characterized in that, The step of obtaining the second integral output upper limit and the second integral output lower limit by subtracting the rated output voltage from the preset reference voltage, the first integral output upper limit, the first integral output lower limit, the first upper limit fitting parameter, and the first lower limit fitting parameter includes: The second integral output upper limit value is obtained by subtracting the first upper limit fitting parameter multiplied by the first difference from the first integral output upper limit value. The second integral output lower limit value is obtained by subtracting the first lower limit fitting parameter multiplied by the first difference from the first integral output lower limit value.

5. The control method for the current-mode resonant converter circuit according to claim 3, characterized in that, The control method for the current-mode resonant converter circuit further includes: If the output voltage is less than or equal to the second difference, return to the step of obtaining the second proportional-integral control parameter using the output current.

6. The control method for the current-mode resonant converter circuit according to claim 3, characterized in that, The first upper limit fitting parameter and the first lower limit fitting parameter are positively correlated with the control interruption frequency.

7. The control method for the current-mode resonant converter circuit according to claim 1, characterized in that, The steps of obtaining proportional-integral control parameters, an upper limit for integral output, and a lower limit for integral output using the comparison result between the preset reference voltage and the rated output voltage of the current-type resonant converter circuit, and the output current, include: When the comparison result indicates that the preset reference voltage is greater than the rated output voltage, the third proportional-integral control parameter is obtained using the output current. Obtain the output voltage, the first integral output upper limit value, the first integral output lower limit value, the second upper limit fitting parameter, and the second lower limit fitting parameter; The third integral output upper limit and the third integral output lower limit are obtained by subtracting the first difference of the rated output voltage from the preset reference voltage, the first integral output upper limit value, the first integral output lower limit value, the second upper limit fitting parameter, and the second lower limit fitting parameter; The step of obtaining the control output signal using the proportional-integral control parameters, the upper limit of the integral output, and the lower limit of the integral output includes: Detect whether the output voltage is greater than the third difference between the preset reference voltage and the second voltage value at one time step; wherein, the second voltage value at one time step is the difference between the currently acquired output voltage and the output voltage acquired at the previous time step; If the output voltage is greater than the third difference, the control output signal is obtained using the third proportional-integral control parameter, the third integral output upper limit, and the third integral output lower limit.

8. The control method for the current-mode resonant converter circuit according to claim 7, characterized in that, The step of obtaining the third integral output upper limit and the third integral output lower limit by subtracting the rated output voltage from the preset reference voltage, the first integral output upper limit, the first integral output lower limit, the second upper limit fitting parameter, and the second lower limit fitting parameter includes: The third integral output upper limit value is obtained by subtracting the product of the second upper limit fitting parameter and the first difference from the first integral output upper limit value. The third integral output lower limit value is obtained by subtracting the second lower limit fitting parameter multiplied by the first difference from the first integral output lower limit value.

9. The control method for the current-mode resonant converter circuit according to claim 7, characterized in that, The control method for the current-mode resonant converter circuit further includes: If the output voltage is less than or equal to the third difference, return to the step of obtaining the third proportional-integral control parameter using the output current.

10. The control method for the current-mode resonant converter circuit according to any one of claims 1-9, characterized in that, The switching adjustment circuit includes a first switching sub-circuit and a second switching sub-circuit, the drive control signal includes a first drive signal and a second drive signal, and the step of obtaining a feedback adjustment signal by slope compensation of the control output signal using a set slope compensation slope includes: In the first half of the signal cycle of each drive control signal, in response to the second drive signal being adjusted from the first level to the second level, the first drive signal is adjusted from the second level to the first level after a set delay. Delay the set duration or simultaneously use the set slope compensation rate to perform slope compensation on the control output signal to obtain a feedback adjustment signal; The step of generating a drive control signal using the feedback adjustment signal and the resonant electrical signal includes: When the amplitude of the feedback adjustment signal is less than or equal to the resonant electrical signal, the first driving signal is adjusted from the first level to the second level; In the second half of each driving control signal cycle, the first driving signal of the first half of each driving control signal cycle is copied to obtain the second driving signal; The step of sending the drive control signal to the switch adjustment circuit to adjust the switching state of the switch adjustment circuit and to adjust the output current and / or the output voltage of the adjustment output circuit includes: The first driving signal and the second driving signal are respectively sent to the first switch sub-circuit and the second switch sub-circuit to adjust the switching state of the first switch sub-circuit and the second switch sub-circuit, thereby adjusting the output current and / or the output voltage of the regulating output circuit.

11. The control method for the current-mode resonant converter circuit according to any one of claims 1-9, characterized in that, Before the step of obtaining the proportional-integral control parameters, the upper limit of the integral output, and the lower limit of the integral output using the comparison result between the preset reference voltage and the rated output voltage of the current-type resonant converter circuit and the output current, the following steps are included: Receive program control commands from the host computer or user input; The preset reference voltage is set or adjusted based on the program control instructions.

12. A current-mode resonant converter circuit, characterized in that, The current-mode resonant converter circuit includes a switching adjustment circuit, a resonant circuit, an adjustment output circuit, and a main control circuit. The switching adjustment circuit is coupled to the resonant circuit and is used to couple with the power supply circuit. The resonant circuit is coupled to the adjustment output circuit. The main control circuit is coupled to the switch adjustment circuit, the resonant circuit, and the adjustment output circuit to control the switch adjustment circuit using the control method of the current-type resonant converter circuit as described in any one of claims 1-11.

13. An electronic device, characterized in that, The electronic device includes a housing and a current-mode resonant converter circuit connected to the housing; The current-mode resonant converter circuit is the current-mode resonant converter circuit as described in claim 12.

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