Drive control method, drive control circuit and electronic equipment

Abstract

The present application discloses a drive control method, a drive control circuit, and an electronic device, the drive control method comprising: detecting whether a three-phase resonant conversion circuit is currently in a light-load state; if the three-phase resonant conversion circuit is currently in a light-load state, adjusting one of a first control signal, a second control signal, and a third control signal to a set level state; adjusting the phase difference between the other two of the first control signal, the second control signal, and the third control signal to within a set threshold range; and using the first control signal, the second control signal, and the third control signal to respectively adjust the switching states of the first phase switch subcircuit, the second phase switch subcircuit, and the third phase switch subcircuit in the three-phase resonant conversion circuit. In the above manner, the drive control method of the present application can ensure that the three-phase resonant conversion circuit has a higher gain when the three-phase resonant conversion circuit is in a light-load state, thereby having a wider range of load capacity and better performance.

Description

Technical Field

[0001] The present application relates to the field of circuit control technology, and in particular to a drive control method, a drive control circuit, and an electronic device. Background Art

[0002] The three-phase LLC (containing an additional inductance (L) in series with two other components, the inductor L and the capacitor (C)) resonant converter is a high-efficiency, high-power density power electronic converter widely used in industrial power supplies, uninterruptible power supplies, electric vehicle charging stations, renewable energy systems and other fields.

[0003] In a three-phase interleaved parallel LLC topology, the classic wave generation method uses three drive carriers with a 120° phase shift. The upper and lower transistors in each phase drive in complementary phases, meaning the upper transistor is on when the lower transistor is off. However, the three-phase operating range is limited by the maximum frequency, preventing optimal performance at light loads. Summary of the Invention

[0004] The main technical problem solved by the present application is to provide a drive control method, a drive control circuit and an electronic device, which can solve the problem of low gain of the control of the three-phase resonant conversion circuit under light load in the prior art.

[0005] To solve the above technical problems, a technical solution adopted in the present application is: providing a drive control method, which is applied to the drive control of a three-phase resonant conversion circuit, the three-phase resonant conversion circuit including a three-phase switching circuit and a three-phase resonant output circuit, the three-phase switching circuit including a first-phase switching sub-circuit, a second-phase switching sub-circuit and a third-phase switching sub-circuit coupled to each other, the first-phase switching sub-circuit, the second-phase switching sub-circuit and the third-phase switching sub-circuit being coupled to the three-phase resonant output circuit, wherein the drive control method includes: detecting whether the three-phase resonant conversion circuit is currently in a light-load state; if the three-phase resonant conversion circuit is currently in a light-load state, adjusting one of the first control signal, the second control signal and the third control signal to a set level state; adjusting the phase difference between the other two of the first control signal, the second control signal and the third control signal to within a set threshold range; and using the first control signal, the second control signal and the third control signal to adjust the switching states of the first-phase switching sub-circuit, the second-phase switching sub-circuit and the third-phase switching sub-circuit respectively.

[0006] The step of detecting whether the three-phase resonant conversion circuit is currently in a light-load state includes: obtaining a state feedback signal in the three-phase resonant conversion circuit; and using the state feedback signal to detect whether the three-phase resonant conversion circuit is currently in a light-load state.

[0007] Among them, the step of adjusting the phase difference between the other two of the first control signal, the second control signal and the third control signal to within the set threshold range includes: obtaining the output voltage of the three-phase resonant output circuit; and using the difference between the output voltage and the target output voltage to adjust the phase difference between the other two control signals of the first control signal, the second control signal and the third control signal.

[0008] Among them, the step of using the difference between the output voltage and the target output voltage to adjust the phase difference between the other two control signals of the first control signal, the second control signal and the third control signal includes: within a set threshold range, using the difference between the output voltage and the target output voltage to dynamically adjust the phase of any one of the other two control signals of the first control signal, the second control signal and the third control signal.

[0009] Among them, the step of adjusting the phase difference between the other two control signals among the first control signal, the second control signal and the third control signal to within the set threshold range includes: within the set threshold range, using a set monotonic function to adjust the phase of any one of the other two control signals among the first control signal, the second control signal and the third control signal; wherein the set threshold range is 0 to 180 degrees.

[0010] The first phase switch subcircuit includes a first switch tube and a second switch tube, the second phase switch subcircuit includes a third switch tube and a fourth switch tube, and the third phase switch subcircuit includes a fifth switch tube and a sixth switch tube. The first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube, and the sixth switch tube are coupled to each other and to the three-phase resonant output circuit. The first control signal includes a first drive signal and a second drive signal, the second control signal includes a third drive signal and a fourth drive signal, and the third control signal includes a fifth drive signal and a sixth drive signal. The first drive signal and the second drive signal are complementary and symmetrical in phase, the third drive signal and the fourth drive signal are complementary and symmetrical in phase, and the fifth drive signal and the sixth drive signal are complementary and symmetrical in phase. The step of adjusting one of the first control signal, the second control signal, and the third control signal to a set level state includes: adjusting the first drive signal to a predetermined level. the step of adjusting one of the first control signal, the second control signal, and the third control signal to a first level state or a second level state; the step of adjusting the phase difference between the other two control signals among the first control signal, the second control signal, and the third control signal to within a set threshold range includes: adjusting the phase difference between the other two drive signals among the first drive signal, the third drive signal, and the fifth drive signal to within a set threshold range; the step of using the first control signal, the second control signal, and the third control signal to respectively adjust the switching states of the first phase switch sub-circuit, the second phase switch sub-circuit, and the third phase switch sub-circuit includes: using the first drive signal, the second drive signal, the third drive signal, the fourth drive signal, the fifth drive signal, and the sixth drive signal to respectively adjust the switching states of the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube, and the sixth switch tube.

[0011] Among them, the step of adjusting one of the first control signal, the second control signal and the third control signal to a set level state includes: adjusting one of the second drive signal, the fourth drive signal and the sixth drive signal to a first level state or a second level state; the step of adjusting the phase difference between the other two control signals among the first control signal, the second control signal and the third control signal to within a set threshold range includes: adjusting the phase difference between the other two drive signals among the second drive signal, the fourth drive signal and the sixth drive signal to within a set threshold range.

[0012] The drive control method includes: if the three-phase resonant conversion circuit is not currently in a light-load state, adjusting the phase difference between every two control signals among the first control signal, the second control signal and the third control signal to 120 degrees.

[0013] In order to solve the above technical problems, another technical solution adopted in this application is: providing a drive control circuit, wherein the drive control circuit is used to couple with the three-phase resonant conversion circuit; wherein the drive control circuit is used to control the three-phase resonant conversion circuit using the drive control method described in any one of the above items.

[0014] In order to solve the above technical problems, another technical solution adopted in this application is: to provide an electronic device, wherein the electronic device includes a shell and a drive control circuit connected to the shell; wherein the drive control circuit is the drive control circuit described above.

[0015] The beneficial effect of the present application is that, different from the prior art, the driving control method provided by the present application, when detecting that the three-phase resonant conversion circuit is currently in a light-load state, adjusts one of the first control signal, the second control signal, and the third control signal to a set level state, and adjusts the phase difference between the other two of the first control signal, the second control signal, and the third control signal to within a set threshold range, so as to use the first control signal, the second control signal, and the third control signal to respectively adjust the switching states of the first phase switching sub-circuit, the second phase switching sub-circuit, and the third phase switching sub-circuit in the three-phase resonant conversion circuit, thereby effectively ensuring that the three-phase resonant conversion circuit still has a high gain when the three-phase resonant conversion circuit is in a light-load state, so as to have a wider range of load capacity and better performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive work, among which:

[0017] Figure 1 This is a flow chart of the first embodiment of the drive control method of the present application;

[0018] Figure 2 This is a schematic structural diagram of a first embodiment of the drive control circuit of the present application;

[0019] Figure 3 1 is a waveform diagram of the phase and gain curve of the driving control signal of the three-phase resonant conversion circuit;

[0020] Figure 4 yes Figure 1 A schematic diagram of a flow chart of an embodiment of S13;

[0021] Figure 5 This is a flow chart of the second embodiment of the drive control method of the present application;

[0022] Figure 6 It is a structural diagram of a specific implementation of a three-phase resonant conversion circuit;

[0023] Figure 7 It is a structural diagram of another specific implementation of the three-phase resonant conversion circuit;

[0024] Figure 8 Schematic diagram of the waveform of the phase shift of the driving control signal of the three-phase resonant conversion circuit;

[0025] Figure 9 Schematic diagram of the waveforms of two driving control signals and resonant cavity current with a phase difference of 90 degrees corresponding to the three-phase resonant conversion circuit;

[0026] Figure 10 Schematic diagram of waveforms of two driving control signals and resonant cavity current with a phase difference of 180 degrees corresponding to the three-phase resonant conversion circuit;

[0027] Figure 11 Schematic diagram of the waveforms of two driving control signals and resonant cavity current with a phase difference of 270 degrees corresponding to the three-phase resonant conversion circuit;

[0028] Figure 12 It is a structural diagram of an embodiment of the electronic device of the present application. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0030] 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 identified. Therefore, features specified as "first," "second," or "third" may explicitly or implicitly include at least one of such features. In the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined. All directional designations (such as up, down, left, right, front, back, etc.) in the embodiments of this application are intended only to illustrate the relative positional relationships and movement of components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional designations will also change accordingly. Furthermore, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements but may optionally include steps or elements not listed, or may optionally include other steps or elements inherent to such process, method, product, or apparatus.

[0031] Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it refer to independent or alternative embodiments that are mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0032] The present application is described in detail below with reference to the accompanying drawings and implementation methods.

[0033] Please refer to Figure 1 and Figure 2 ,in, Figure 1 This is a flow chart of the first embodiment of the drive control method of the present application. Figure 2 This is a schematic diagram of the structure of the first embodiment of the drive control circuit of the present application. Specifically, it can include the following steps:

[0034] S11: Detect whether the three-phase resonant conversion circuit is currently in a light-load state.

[0035] It is understood that the drive control method in this embodiment is specifically applied to Figure 2The drive control of the first three-phase resonant conversion circuit 30 shown in the figure, the first three-phase resonant conversion circuit 30 includes a first three-phase switching circuit 31 and a first three-phase resonant output circuit 32, the first three-phase switching circuit 31 includes a first first-phase switching sub-circuit 311, a first second-phase switching sub-circuit 312 and a first third-phase switching sub-circuit 313 coupled to each other, the first first-phase switching sub-circuit 311, the first second-phase switching sub-circuit 312 and the first third-phase switching sub-circuit 313 are coupled to the first three-phase resonant output circuit 32, and are used to couple with the first drive control circuit 20; wherein, the first drive control circuit 20 adopts any drive control method of this document to control the first three-phase resonant conversion circuit 30.

[0036] It is worth noting that the term "coupled" as used herein encompasses both direct and indirect connection methods. Therefore, if a first circuit is described as being coupled to a second circuit, this means that the first circuit may be directly connected to the second circuit via electrical connection, wireless transmission, optical transmission, or other signal connection methods, or may be indirectly connected to the second circuit via other circuits or connection methods.

[0037] In some embodiments, the first drive control circuit 20 may specifically include a control chip, a DSP (Digital Signal Processing) chip, an MCU (Micro Controller Unit) circuit, a CPU (Central Processing Unit), a single-chip microcomputer, a field programmable gate array, a programmable logic device, a discrete gate or transistor logic device, discrete hardware, and any other reasonable circuit unit with signal processing function, and this application does not limit this.

[0038] Specifically, the first drive control circuit 20 is used to sample and obtain parameters such as voltage, current, amplitude change amplitude, etc. that reflect the current working state of the first three-phase resonant conversion circuit 30 from the first three-phase resonant conversion circuit 30, such as the resonant current on the primary side or the output voltage on the secondary side of an LLC resonant converter, and one or more of any reasonable electrical parameters, so as to use one or more of the currently obtained electrical parameters to determine whether the first three-phase resonant conversion circuit 30 is in a light-load state. This application does not limit this.

[0039] It's worth noting that light load refers to a load factor below the rated load, with the specific threshold varying depending on the application scenario. In circuits or mechanical systems, a load factor below 30%-50% is generally considered light load. Its manifestation depends on the load type: a constant current source with a small resistance value is considered light load, while a constant voltage source with a large resistance value is considered light load.

[0040] If the first three-phase resonant conversion circuit 30 is currently in a light-load state, S12 is executed; if the first three-phase resonant conversion circuit 30 is currently not in a light-load state, S15 is executed.

[0041] S12: adjusting one of the first control signal, the second control signal, and the third control signal to a set level state.

[0042] Specifically, when the first three-phase resonant conversion circuit 30 is currently in a light-load state, the first drive control circuit 20 adjusts any one of the first control signal, the second control signal and the third control signal corresponding to the first first-phase switch sub-circuit 311, the first second-phase switch sub-circuit 312 and the first third-phase switch sub-circuit 313 to a set level state.

[0043] In some embodiments, the first control signal, the second control signal, and the third control signal may specifically be one or more of any reasonable control signals such as a PWM (Pulse Width Modulation) signal or a PFM (Pulse Frequency Modulation) signal, and this application does not limit this.

[0044] Among them, the set level state can be understood as setting the corresponding control signal to a constant high level or low level in the light load stage of the first three-phase resonant conversion circuit 30, so that the corresponding switch sub-circuit is in a normally open or normally closed state, thereby reducing unnecessary switching actions and reducing power consumption and loss.

[0045] S13: adjusting the phase difference between the other two of the first control signal, the second control signal, and the third control signal to be within a set threshold range.

[0046] Furthermore, the first drive control circuit 20 adjusts the phase difference between the remaining two control signals to within a specific set threshold range to maintain a balanced three-phase system and prevent overload or inefficiency in any one phase. By precisely adjusting the phase difference, energy transfer efficiency and gain can be optimized, particularly under light load conditions, ensuring efficient system operation and optimal gain.

[0047] For ease of understanding, when it is determined that the first three-phase resonant conversion circuit 30 is in a light-load state, the first drive control circuit 20 can specifically adjust the third control signal to a set level state, and adjust the phase of the first control signal and / or the second control signal to adjust the phase difference between the first control signal and the second control signal, and keep the phase difference within the set threshold range.

[0048] Please continue reading Figure 3 , Figure 3It is a waveform diagram of the phase and gain curve of the driving control signal of the three-phase resonant conversion circuit.

[0049] It can be understood that while the switching frequencies of the first, second, and third control signals remain constant, the output gain is varied by changing the phase difference between the first and second control signals. As this phase difference increases, the gain also increases. When the phase difference is 50%, meaning the first or second control signal has shifted 180 degrees, the gain is maximum. However, when the phase difference exceeds 180 degrees, the gain decreases as the phase continues to increase. Therefore, when actually controlling the phase difference between the first and second control signals, it is necessary to control the phase difference within a certain range to ensure monotonic gain.

[0050] Among them, the set threshold range is reasonably set to ensure the monotonicity of the gain of the first three-phase resonant conversion circuit 30, such as any reasonable phase threshold range of 0-180 degrees, or 10-150 degrees, or 20-160 degrees, etc., and this application does not limit this.

[0051] In other embodiments, when it is determined that the first three-phase resonant conversion circuit 30 is in a light-load state, the first drive control circuit 20 can specifically further adjust the first control signal to a set level state and adjust the phase difference between the second control signal and the third control signal; or, adjust the second control signal to a set level state and adjust the phase difference between the first control signal and the third control signal, which will not be repeated here.

[0052] S14: Utilizing the first control signal, the second control signal, and the third control signal, respectively adjust the switching states of the first phase switch sub-circuit, the second phase switch sub-circuit, and the third phase switch sub-circuit.

[0053] Furthermore, the first drive control circuit 20 uses the adjusted control signal to actually regulate the state of each phase switch sub-circuit, that is, sends the first control signal, the second control signal, and the third control signal to the first-phase switch sub-circuit 311, the first-second-phase switch sub-circuit 312, and the first-third-phase switch sub-circuit 313, respectively, to trigger the first-phase switch sub-circuit 311, the first-second-phase switch sub-circuit 312, and the first-third-phase switch sub-circuit 313 to turn on or off, respectively. That is, the corresponding switching elements are turned on or off according to the changes in the corresponding control signals, thereby achieving effective management of the entire first three-phase resonant conversion circuit 30 to maintain a stable output voltage, efficient energy conversion, and good gain under different load conditions.

[0054] S15: Adjust the phase difference between every two control signals among the first control signal, the second control signal, and the third control signal to 120 degrees.

[0055] It is understandable that when the first drive control circuit 20 determines that the first three-phase resonant conversion circuit 30 is not currently in a light-load state, it adjusts the phase difference between each two control signals in the first control signal, the second control signal, and the third control signal to 120 degrees, and controls the working states of the first first-phase switch sub-circuit 311, the first second-phase switch sub-circuit 312, and the first third-phase switch sub-circuit 313 according to the adjusted first control signal, the second control signal, and the third control signal, respectively, to ensure the symmetry and balance of the three-phase system, especially under heavy load or normal load conditions, to achieve optimal energy transmission efficiency and stability.

[0056] The above solution adjusts one of the first, second, and third control signals to a set level and adjusts the phase difference between the other two to within a set threshold range. The first, second, and third control signals are then used to adjust the switching states of the first first-phase switching sub-circuit 311, the first second-phase switching sub-circuit 312, and the first third-phase switching sub-circuit 313 in the first three-phase resonant conversion circuit 30, respectively. This effectively ensures that the first three-phase resonant conversion circuit 30 maintains a high gain even when the first three-phase resonant conversion circuit 30 is lightly loaded, resulting in a wide range of load capacity and excellent performance. Furthermore, by managing and optimizing the operation of the first three-phase resonant conversion circuit 30 in a flexible and efficient manner, especially under light-load conditions, this not only helps reduce energy consumption and extend equipment life, but also improves the overall stability and reliability of the system. Furthermore, by dynamically adjusting the control signals and their phase differences, the system's adaptability to load changes is enhanced, ensuring optimal performance even under fluctuating load conditions.

[0057] Furthermore, in one embodiment, the above S13 may specifically include: adjusting the phase of any other two of the first control signal, the second control signal, and the third control signal by using a set monotonic function within a set threshold range.

[0058] It is understandable that the first drive control circuit 20 adjusts the other two of the first control signal, the second control signal and the third control signal, such as the phase difference between the first control signal and the second control signal, within a set threshold range.

[0059] Specifically, the first drive control circuit 20 can employ a predetermined monotonic function, such as a linearly increasing function, an arithmetic function, an exponential function, or any other suitable monotonic function, to calculate the specific adjustment amount for the phase difference between the control signals, thereby performing phase shift adjustment on the first control signal or the second control signal. This predetermined monotonic function ensures that as the input (e.g., the error between the output voltage and the target voltage) changes, the output (i.e., the phase difference) changes in the same direction, but the rate of change may vary.

[0060] Furthermore, the first drive control circuit 20 must ensure that the adjusted phase difference remains within a set threshold range, such as 0 to 180 degrees, to ensure that the first three-phase resonant converter circuit 30 maintains a high gain even when the first three-phase resonant converter circuit 30 is lightly loaded, thereby achieving a wide load capacity and good performance. If the calculated phase difference exceeds this range, measures must be taken to limit it to a valid range (for example, the excess can be handled through a modulo operation).

[0061] In some embodiments, the set threshold range can specifically be any reasonable phase threshold range such as 0-180 degrees, or 10-150 degrees, or 20-160 degrees, and this application does not limit this.

[0062] Please continue reading Figure 4 , Figure 4 yes Figure 1 In one embodiment, the drive control method of the present application includes, in addition to the above steps S11-S14, further including some more specific steps. Specifically, the above step S13 may further include the following steps:

[0063] S131: Obtain the output voltage of the three-phase resonant output circuit.

[0064] Specifically, the first drive control circuit 20 obtains the output voltage of each phase from the first three-phase resonant output circuit 32, for example, through any reasonable circuit sampling unit such as a voltage sensor or a voltage divider network, to convert the physical voltage into a processable electrical signal, which is not limited in this application.

[0065] S132: Using the difference between the output voltage and the target output voltage, adjust the phase difference between the other two control signals among the first control signal, the second control signal, and the third control signal.

[0066] Furthermore, the first drive control circuit 20 dynamically adjusts the phase of the control signal based on actual needs to maintain or restore the desired output voltage level. For example, this can be done by calculating the difference (i.e., error) between the actual output voltage of each phase and a preset target output voltage. This error reflects the deviation between the current output and the desired output. Based on this difference, the phase difference between the first control signal, the second control signal, and the other two control signals among the third control signal can be dynamically adjusted to ensure that the phase difference is within a set threshold range.

[0067] For example, the phase difference may specifically be the phase difference between the first control signal and the second control signal. The first drive control circuit 20 adjusts the phase difference between the first and second control signals based on the currently calculated difference. If the output voltage is lower than the target value, the phase difference may need to be reduced to increase energy transfer; conversely, if the output voltage is higher than the target value, the phase difference may need to be increased to reduce energy transfer. The first drive control circuit 20 may also input the difference into its internal PI (proportional integral) controller, which can then dynamically adjust the phase of the first control signal and / or the second control signal using the PI controller. For example, the phase of the second control signal remains unchanged while the phase of the first control signal is dynamically adjusted; alternatively, the phase of the first control signal remains unchanged while the phase of the second control signal is adjusted; or alternatively, the phases of both the first and second control signals are adjusted, with different adjustment amplitudes.

[0068] Furthermore, in one embodiment, the above S132 may specifically include: dynamically adjusting the phase of any other two of the first control signal, the second control signal and the third control signal by using the difference between the output voltage and the target output voltage within a set threshold range.

[0069] It is understood that the first drive control circuit 20 may first define a suitable threshold range for determining whether the output voltage is close to the target value. This range may be determined according to specific application requirements, such as ±5% of the target output voltage.

[0070] Furthermore, the current actual output voltage is obtained from the first three-phase resonant output circuit 32, and the actual output voltage is compared with the target output voltage to calculate the difference between the two (i.e., the error). In a light-load state, if the output voltage is detected to deviate from the target value, one of the other two of the first control signal, the second control signal, and the third control signal, such as the first control signal or the second control signal, is selected as the object for phase adjustment. If the output voltage is lower than the target value, it may be necessary to reduce the phase difference between the selected control signal and the other signals to increase energy transmission efficiency. If the output voltage is higher than the target value, it may be necessary to increase the phase difference between the selected control signal and the other signals to reduce energy input.

[0071] To more precisely adjust the phase difference, a PI controller or other advanced control algorithm can be used to process the error signal and generate an appropriate adjustment. These algorithms can provide smoother and more stable regulation based on the system's dynamic response characteristics. Based on the above analysis results, the phase setting of the corresponding control signal is updated, which in turn affects the operating state of the corresponding switching sub-circuit. Because load conditions may change over time, it is necessary to continuously monitor the output voltage and adjust the phase of the first or second control signal as needed to ensure that the output voltage remains within the set threshold range.

[0072] See also Figure 5 and Figure 6 ,in, Figure 5 This is a flow chart of the second embodiment of the drive control method of the present application. Figure 6 This is a schematic diagram of a three-phase resonant conversion circuit in a specific embodiment. The drive control method of this embodiment is Figure 1 A flowchart of a detailed implementation of the drive control method in FIG. 1 specifically includes the following steps:

[0073] S41: Obtaining a state feedback signal in the three-phase resonant conversion circuit.

[0074] It is understandable that the driving control method in this embodiment can specifically be that the first driving control circuit 20 Figure 6The second three-phase resonant conversion circuit 50 shown implements drive control. The second three-phase resonant conversion circuit 50 includes a second three-phase switching circuit 51 and a second three-phase resonant output circuit 52. The second three-phase switching circuit 51 includes a second first-phase switching sub-circuit 511, a second second-phase switching sub-circuit 512, and a second third-phase switching sub-circuit 513 coupled to each other. The second first-phase switching sub-circuit 511 includes a first switching transistor Q1 and a second switching transistor Q2. The second second-phase switching sub-circuit 512 includes a third switching transistor Q3 and a fourth switching transistor Q4. The second third-phase switching sub-circuit 513 includes a fifth switching transistor Q5 and a sixth switching transistor Q6. The first switching transistor Q1, the second switching transistor Q2, the third switching transistor Q3, the fourth switching transistor Q4, the fifth switching transistor Q5, and the sixth switching transistor Q6 are coupled to each other and to the second three-phase resonant output circuit 52 and the first drive control circuit 20.

[0075] Among them, the "three-phase" in this article can be understood as the second-first phase switch sub-circuit 511, the second-second phase switch sub-circuit 512 and the second-third phase switch sub-circuit 513, and the "two-phase" corresponds to any two phases of the second-first phase switch sub-circuit 511, the second-second phase switch sub-circuit 512 and the second-third phase switch sub-circuit 513.

[0076] The second three-phase resonant output circuit 52 may further include a second three-phase resonant sub-circuit 521, a second three-phase isolation transformer sub-circuit 522, and a second three-phase rectifier sub-circuit 523. The second three-phase resonant sub-circuit 521 includes a first resonant inductor Lr1, a first resonant capacitor Cr1, a second resonant inductor Lr2, a second resonant capacitor Cr2, a third resonant inductor Lr3, and a third resonant capacitor Cr3. The second three-phase isolation transformer sub-circuit 522 includes a first primary winding Lm1, a second primary winding Lm2, a third primary winding Lm3, a first secondary winding Ln1, a second secondary winding Ln2, and a third secondary winding Ln3. The second three-phase rectifier sub-circuit 523 includes a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, and a sixth diode D6.

[0077] The second end of the first switch Q1 is coupled to the second end of the third switch Q3 and the second end of the fifth switch Q5, and is coupled to the first end of the power circuit 101 to obtain the power input vin. The third end of the first switch Q1 is coupled to the second end of the second switch Q2 and the first end of the first resonant inductor Lr1. The third end of the third switch Q3 is coupled to the second end of the fourth switch Q4 and the first end of the second resonant inductor Lr2. The third end of the fifth switch Q5 is coupled to the second end of the sixth switch Q6 and the first end of the third resonant inductor Lr3. The third end of the second switch Q2 is coupled to the third end of the fourth switch Q4 and the third end of the sixth switch Q6, and is coupled to the second end of the power circuit 101. The first end of each of the first, second, third, fourth, fifth, and sixth switches Q1, Q2, Q3, Q4, Q5, and Q6 is coupled to the first drive control circuit 20, and each has a freewheeling diode and a parasitic capacitor therein.

[0078] The second end of the first resonant inductor Lr1 is coupled to the first end of the first resonant capacitor Cr1, the second end of the second resonant inductor Lr2 is coupled to the first end of the second resonant capacitor Cr2, the second end of the third resonant inductor Lr3 is coupled to the first end of the third resonant capacitor Cr3, the second end of the first resonant capacitor Cr1 is coupled to the first end of the first primary winding Lm1, the second end of the second resonant capacitor Cr2 is coupled to the first end of the second primary winding Lm2, the second end of the third resonant capacitor Cr3 is coupled to the first end of the third primary winding Lm3, the second end of the first primary winding Lm1 is coupled to the second end of the second primary winding Lm2 and the second end of the third primary winding Lm3, the first primary winding Lm1 is coupled to the first secondary winding Ln1, the second primary winding Lm2 is coupled to the second secondary winding Ln2, the third primary winding Lm3 is coupled to the third secondary winding Ln3, and the first end of the first secondary winding Ln1 is coupled to the first secondary winding Ln1. The first end of the first diode D1 and the second end of the second diode D2 are coupled, the first end of the second secondary winding Ln2 is coupled to the first end of the third diode D3 and the second end of the fourth diode D4, the first end of the third secondary winding Ln3 is coupled to the first end of the fifth diode D5 and the second end of the sixth diode D6, the second end of the first secondary winding Ln1 is coupled to the second end of the second secondary winding Ln2 and the second end of the second secondary winding Ln2, the second end of the first diode D1 is coupled to the second end of the third diode D3 and the second end of the fifth diode D5, and is used to couple to the load circuit 102, such as the first end of the load resistor Ro, and is used to couple to the first end of the signal function circuit, the second end of the first end of the second diode D2 is coupled to the first end of the fourth diode D4 and the first end of the sixth diode D6, and is used to couple to the load circuit 102, such as the second end of the load stabilizing resistor Ro.

[0079] In other embodiments, the second three-phase resonant output circuit 52 may further include a larger number of inductors, and / or resistors, and / or capacitors; each secondary winding in the second three-phase isolation transformer sub-circuit 522 may further have at least two sub-windings; each diode in the second three-phase rectifier sub-circuit 523 may further be replaced by a switching tube; the second voltage-stabilized output circuit 524 may further include a voltage-stabilizing capacitor, and may also be integrated into the back-end signal function circuit, that is, the second three-phase resonant conversion circuit 50 may further be any other reasonable three-phase LLC resonant topology circuit topology form, which is specifically determined by the actual application scenario and is not limited in this application.

[0080] In some embodiments, the first switch tube Q1, the second switch tube Q2, the third switch tube Q3, the fourth switch tube Q4, the fifth switch tube Q5 and the sixth switch tube Q6 can specifically be MOS (Metal Oxide Semiconductor Field Effect Transistor) tubes, triodes, thin film transistors or field effect transistors or any other reasonable switch tubes, and this application does not limit this.

[0081] It is worth noting that, to distinguish the two ends of each switching transistor other than the control terminal, one of the two ends is referred to as the second terminal, and the other is referred to as the third terminal. When each switching transistor is a triode, the control terminal, i.e., the first end, can be specifically the base, the second end the collector, and the third end the emitter; alternatively, the first end can be specifically the base, the second end the emitter, and the third end the collector.

[0082] When the above switching tubes are MOS tubes, thin film transistors or field effect transistors, the first end can be a gate, the second end can be a drain, and the third end can be a source; or, the first end can be a gate, the second end can be a source, and the third end can be a drain.

[0083] When each switch tube is a MOS tube, 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.

[0084] Please continue to participate Figure 7 , Figure 7 It is a structural diagram of another specific implementation of the three-phase resonant conversion circuit.

[0085] It is understandable that the third three-phase resonant conversion circuit 60 in this embodiment is Figure 6The only difference between the second three-phase resonant conversion circuit 50 and the second three-phase resonant conversion circuit 50 is that the secondary side of the third three-phase isolation transformer sub-circuit 622 in the third three-phase resonant conversion circuit 60 adopts a D (delta) connection, that is, the first primary winding Lm1, the second primary winding Lm2, and the third primary winding Lm3 in the third three-phase isolation transformer sub-circuit 622 adopt a Y (star) connection, and the first secondary winding Ln1, the second secondary winding Ln2, and the third secondary winding Ln3 adopt a D (delta) connection.

[0086] The third three-phase switch circuit 61, the third first-phase switch sub-circuit 611, the third second-phase switch sub-circuit 612, the third third-phase switch sub-circuit 613, the third three-phase resonant output circuit 62, the third three-phase resonant sub-circuit 621 and the third three-phase rectifier sub-circuit 623 are respectively the same as Figure 6 The second three-phase switching circuit 51, the second first-phase switching sub-circuit 511, the second second-phase switching sub-circuit 512, the second third-phase switching sub-circuit 513, the second three-phase resonant output circuit 52, the second three-phase resonant sub-circuit 521, and the second three-phase rectifier sub-circuit 523 are shown in FIG. Figure 6 And the related text content will not be repeated here.

[0087] In some other embodiments, the third three-phase resonant conversion circuit 60 can specifically correspond to a three-phase isolation transformer sub-circuit in which both the primary and secondary sides are connected in a Y (star) type, or the primary side is a D (triangle) type connection and the secondary side is a D (triangle) type connection; the primary side is a D (triangle) type connection and the secondary side is a Y (star) type connection, and this application does not limit this.

[0088] Specifically, the first drive control circuit 20 is used to sample and obtain state feedback signals such as voltage, current, amplitude change amplitude, etc. that reflect the current working state of the second three-phase resonant conversion circuit 50 from the second three-phase resonant conversion circuit 50, such as one or more of any reasonable electrical parameters such as the resonant current on the primary side or the output voltage Vo on the secondary side in the second three-phase resonant conversion circuit 50. This application does not limit this.

[0089] S42: Detect whether the three-phase resonant conversion circuit is currently in a light-load state using the state feedback signal.

[0090] Furthermore, the first drive control circuit 20 can determine the current load status by processing and analyzing the collected state feedback signal. For example, if the output voltage Vo is lower than the expected value, it may indicate an increase in the load; conversely, if the output voltage Vo is higher than expected, it may indicate a decrease in the load. Based on this information, it can also determine in real time whether the load is lightly loaded, heavily loaded, or unloaded, and specifically determine whether the second three-phase resonant conversion circuit 50 is currently lightly loaded.

[0091] In other embodiments, the first drive control circuit 20 can also specifically determine the light load state by detecting whether the DC gain (the ratio of the output voltage Vo to the input voltage) deviates from the design value; or, monitoring whether the switching frequency is significantly higher than the rated resonant frequency can assist in determining the light load state; or, indirectly identifying the light load by measuring the resonant cavity impedance or calculating the change in energy transfer efficiency; or, using an oscilloscope to observe whether the resonant current waveform is close to a sine wave or exhibits discontinuous characteristics, and determining the light load state by measuring the current and voltage phase difference; or, using a digital controller to collect parameters such as input voltage, output current, switching frequency in real time, and combining a preset algorithm (such as a nonlinear multivariable model) to determine the light load state, or any other reasonable detection method to determine whether the second three-phase resonant conversion circuit 50 is currently in a light load state, which is not limited in this application.

[0092] If the second three-phase resonant conversion circuit 50 is currently in a light-load state, S43 is executed; if the second three-phase resonant conversion circuit 50 is currently not in a light-load state, S46 is executed.

[0093] S43: adjusting one of the first driving signal, the third driving signal, and the fifth driving signal to a first level state or a second level state.

[0094] It can be understood that the first control signal includes the first drive signal PWM1 and the second drive signal PWM2, the second control signal includes the third drive signal PWM3 and the fourth drive signal PWM4, the third control signal includes the fifth drive signal PWM5 and the sixth drive signal PWM6, the first drive signal PWM1 and the second drive signal PWM2 are complementary and symmetrical in phase, the third drive signal PWM3 and the fourth drive signal PWM4 are complementary and symmetrical in phase, and the fifth drive signal PWM5 and the sixth drive signal PWM6 are complementary and symmetrical in phase.

[0095] Specifically, the first driving control circuit 20 can adjust one of the first driving signal PWM1 , the third driving signal PWM3 and the fifth driving signal PWM5 , for example, the fifth driving signal PWM5 , to a first level state or a second level state.

[0096] It can be understood that the first level state can be specifically a low level, and the second level state corresponds to a high level; or, the first level state can be specifically a high level, and the second level state corresponds to a low level, so that when it is detected that the second three-phase resonant conversion circuit 50 is currently in a light-load state, the fifth drive signal PWM5 can be specifically adjusted to a low level state or a high level state. At this time, the sixth drive signal PWM6 will correspond to a high level state or a low level state, thereby being able to trigger one of the corresponding fifth switch tube Q5 and the sixth switch tube Q6 to be normally open and the other to be normally closed.

[0097] S44: adjusting the phase difference between the other two driving signals among the first driving signal, the third driving signal and the fifth driving signal to be within a set threshold range.

[0098] Please continue reading Figure 8 , Figure 8 It is a waveform diagram of the phase shift of the driving control signal of the three-phase resonant conversion circuit.

[0099] It is understandable that in order to ensure that the second three-phase resonant conversion circuit 50 has a good gain in the light load stage, the first drive control circuit 20 can specifically adjust the phase difference between the other two drive signals of the first drive signal PWM1, the third drive signal PWM3 and the fifth drive signal PWM5 to within the set threshold range, or in other words, on the premise of ensuring that the phase difference between the other two drive signals, such as the first drive signal PWM1 and the third drive signal PWM3, is within the set threshold range, the first drive signal PWM1 and / or the third drive signal PWM3 are phase-shifted.

[0100] Please continue reading Figures 9-11 ,in, Figure 9 This is a waveform diagram of two drive control signals and resonant cavity current with a phase difference of 90 degrees corresponding to the three-phase resonant conversion circuit. Figure 10 This is a waveform diagram of two drive control signals and resonant cavity current with a phase difference of 180 degrees corresponding to the three-phase resonant conversion circuit. Figure 11 It is a waveform diagram of two driving control signals and resonant cavity current with a phase difference of 270 degrees corresponding to the three-phase resonant conversion circuit.

[0101] It can be seen that when the second three-phase resonant conversion circuit 50 is in a light-load state, after adjusting the fifth drive signal PWM5 to a low-level state or a high-level state, different resonant cavity currents and gains can be obtained by adjusting the phase difference between the first drive signal PWM1 and the third drive signal PWM3, without phase loss. It can also effectively ensure three-phase balance, thereby reducing unnecessary energy loss and harmonic interference, and improving the overall stability and reliability of the system.

[0102] S45: Utilizing the first drive signal, the second drive signal, the third drive signal, the fourth drive signal, the fifth drive signal and the sixth drive signal to adjust the switching states of the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube respectively.

[0103] Furthermore, the first drive control circuit 20 sends the first drive signal PWM1, the second drive signal PWM2, the third drive signal PWM3, the fourth drive signal PWM4, the fifth drive signal PWM5, and the sixth drive signal PWM6 to the first switch transistor Q1, the second switch transistor Q2, the third switch transistor Q3, the fourth switch transistor Q4, the fifth switch transistor Q5, and the sixth switch transistor Q6, respectively, to trigger the first switch transistor Q1, the second switch transistor Q2, the third switch transistor Q3, the fourth switch transistor Q4, the fifth switch transistor Q5, and the sixth switch transistor Q6 to be turned on or off, respectively. That is, the corresponding switching elements are turned on or off according to the changes of the corresponding control signals, thereby achieving effective management of the entire second three-phase resonant conversion circuit 50, so as to maintain a stable output voltage Vo, efficient energy conversion, and good gain under different load conditions.

[0104] S46: Adjust the phase difference between every two driving signals among the first driving signal, the third driving signal and the fifth driving signal to 120 degrees.

[0105] It can be understood that when the first drive control circuit 20 determines that the second three-phase resonant conversion circuit 50 is not currently in a light-load state, the phase difference between each two control signals of the first drive signal PWM1, the third drive signal PWM3 and the fifth drive signal PWM5 is adjusted to 120 degrees. Since the first drive signal PWM1 and the second drive signal PWM2 are complementary and symmetrical in phase, the third drive signal PWM3 and the fourth drive signal PWM4 are complementary and symmetrical in phase, and the fifth drive signal PWM5 and the sixth drive signal PWM6 are complementary and symmetrical in phase, the second drive signal PWM2, the fourth drive signal PWM4 and the sixth drive signal PWM5 are complementary and symmetrical in phase. The phase difference between every two drive signals in the drive signal PWM6 will also be 120 degrees, so that the conduction states of the first switch Q1, the second switch Q2, the third switch Q3, the fourth switch Q4, the fifth switch Q5, and the sixth switch Q6 can be controlled respectively according to the adjusted first drive signal PWM1, the third drive signal PWM3, the fifth drive signal PWM5, the second drive signal PWM2, the fourth drive signal PWM4, and the sixth drive signal PWM6, thereby ensuring the symmetry and balance of the three-phase system, and achieving optimal energy transmission efficiency and stability under heavy load or normal load conditions.

[0106] In some embodiments, the above S43 may be specifically replaced by: adjusting one of the second driving signal PWM2, the fourth driving signal PWM4, and the sixth driving signal PWM6 to the first level state or the second level state.

[0107] It can be understood that since the first drive signal PWM1 and the second drive signal PWM2 are complementary and symmetrical in phase, the third drive signal PWM3 and the fourth drive signal PWM4 are complementary and symmetrical in phase, and the fifth drive signal PWM5 and the sixth drive signal PWM6 are complementary and symmetrical in phase, adjusting any one or more of the second drive signal PWM2, the fourth drive signal PWM4 and the sixth drive signal PWM6 actually corresponds to adjusting the first drive signal PWM1, the third drive signal PWM3 and the fifth drive signal PWM5, and will not be repeated here.

[0108] Furthermore, the above S44 may specifically include: adjusting the phase difference between the other two driving signals among the second driving signal PWM2, the fourth driving signal PWM4 and the sixth driving signal PWM6 to be within a set threshold range.

[0109] It can be understood that since the first drive signal PWM1 and the second drive signal PWM2 are complementary and symmetrical in phase, the third drive signal PWM3 and the fourth drive signal PWM4 are complementary and symmetrical in phase, and the fifth drive signal PWM5 and the sixth drive signal PWM6 are complementary and symmetrical in phase, adjusting any one or more of the second drive signal PWM2, the fourth drive signal PWM4 and the sixth drive signal PWM6 actually corresponds to adjusting the first drive signal PWM1, the third drive signal PWM3 and the fifth drive signal PWM5, and will not be repeated here.

[0110] This application also provides an electronic device, see Figure 12 , Figure 12 FIG. 2 is a schematic diagram of the structure of an electronic device according to an embodiment of the present invention. In this embodiment, the electronic device 70 includes a housing 71 and a second drive control circuit 72 connected to the housing 71 .

[0111] It should be noted that the second drive control circuit 72 described in this embodiment is the first drive control circuit 20 described in any of the above embodiments. Figures 1-11 And the related text content will not be repeated here.

[0112] The beneficial effect of the present application is that, different from the prior art, the driving control method provided by the present application, when detecting that the three-phase resonant conversion circuit is currently in a light-load state, adjusts one of the first control signal, the second control signal, and the third control signal to a set level state, and adjusts the phase difference between the other two of the first control signal, the second control signal, and the third control signal to within a set threshold range, so as to use the first control signal, the second control signal, and the third control signal to respectively adjust the switching states of the first phase switching sub-circuit, the second phase switching sub-circuit, and the third phase switching sub-circuit in the three-phase resonant conversion circuit, thereby effectively ensuring that the three-phase resonant conversion circuit still has a high gain when the three-phase resonant conversion circuit is in a light-load state, so as to have a wider range of load capacity and better performance.

[0113] The above description is only an implementation method of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of this application, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A drive control method, applied to the drive control of a three-phase resonant conversion circuit, wherein the three-phase resonant conversion circuit includes a three-phase switching circuit and a three-phase resonant output circuit, wherein the three-phase switching circuit includes a first-phase switching sub-circuit, a second-phase switching sub-circuit, and a third-phase switching sub-circuit coupled to each other, wherein the first-phase switching sub-circuit, the second-phase switching sub-circuit, and the third-phase switching sub-circuit are coupled to the three-phase resonant output circuit, wherein: The drive control method includes: Detecting whether the three-phase resonant conversion circuit is currently in a light-load state; If the three-phase resonant conversion circuit is currently in a light-load state, one of the first control signal, the second control signal, and the third control signal is adjusted to a set level state; wherein the first phase switch subcircuit includes a first switch transistor and a second switch transistor, the second phase switch subcircuit includes a third switch transistor and a fourth switch transistor, and the third phase switch subcircuit includes a fifth switch transistor and a sixth switch transistor, the first switch transistor, the second switch transistor, the third switch transistor, the fourth switch transistor, the fifth switch transistor, and the sixth switch transistor are coupled to each other and to the three-phase resonant output circuit, the first control signal includes a first drive signal and a second drive signal, the second control signal includes a third drive signal and a fourth drive signal, and the third control signal includes a fifth drive signal and a sixth drive signal, the first drive signal and the second drive signal are complementary and symmetrical in phase, the third drive signal and the fourth drive signal are complementary and symmetrical in phase, and the fifth drive signal and the sixth drive signal are complementary and symmetrical in phase, and the step of adjusting one of the first control signal, the second control signal, and the third control signal to the set level state includes: adjusting one of the first drive signal, the third drive signal, and the fifth drive signal to the first level state or the second level state; adjusting the phase difference between the other two of the first control signal, the second control signal, and the third control signal to within a set threshold range; wherein the step of adjusting the phase difference between the other two of the first control signal, the second control signal, and the third control signal to within the set threshold range comprises: adjusting the phase difference between the other two of the first drive signal, the third drive signal, and the fifth drive signal to within the set threshold range; The first control signal, the second control signal, and the third control signal are used to respectively adjust the switching states of the first phase switch subcircuit, the second phase switch subcircuit, and the third phase switch subcircuit; wherein the steps of respectively adjusting the switching states of the first phase switch subcircuit, the second phase switch subcircuit, and the third phase switch subcircuit by using the first control signal, the second control signal, and the third control signal include: respectively adjusting the switching states of the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube, and the sixth switch tube by using the first drive signal, the second drive signal, the third drive signal, the fourth drive signal, the fifth drive signal, and the sixth drive signal.

2. The driving control method according to claim 1, characterized in that: The step of detecting whether the three-phase resonant conversion circuit is currently in a light-load state includes: Obtaining a state feedback signal in the three-phase resonant conversion circuit; The state feedback signal is used to detect whether the three-phase resonant conversion circuit is currently in a light-load state.

3. The driving control method according to claim 1, wherein: The step of adjusting the phase difference between the other two of the first control signal, the second control signal, and the third control signal to within a set threshold range includes: Obtaining an output voltage of the three-phase resonant output circuit; The phase difference between the other two control signals among the first control signal, the second control signal and the third control signal is adjusted using the difference between the output voltage and the target output voltage.

4. The driving control method according to claim 3, characterized in that: The step of adjusting the phase difference between the other two control signals among the first control signal, the second control signal, and the third control signal by using the difference between the output voltage and the target output voltage comprises: Within the set threshold range, the phase of any other two of the first control signal, the second control signal, and the third control signal is dynamically adjusted using the difference between the output voltage and the target output voltage.

5. The driving control method according to claim 1, characterized in that: The step of adjusting the phase difference between the other two control signals among the first control signal, the second control signal, and the third control signal to within a set threshold range includes: Within the set threshold range, a set monotonic function is used to adjust the phase of any other two of the first control signal, the second control signal and the third control signal; wherein the set threshold range is 0 to 180 degrees.

6. The driving control method according to claim 1, characterized in that: The step of adjusting one of the first control signal, the second control signal, and the third control signal to a set level state comprises: adjusting one of the second drive signal, the fourth drive signal, and the sixth drive signal to the first level state or the second level state; The step of adjusting the phase difference between the other two control signals among the first control signal, the second control signal, and the third control signal to within a set threshold range includes: The phase difference between the other two drive signals among the second drive signal, the fourth drive signal and the sixth drive signal is adjusted to be within the set threshold range.

7. The driving control method according to any one of claims 1 to 6, characterized in that: The drive control method includes: If the three-phase resonant conversion circuit is not currently in a light-load state, the phase difference between each two control signals among the first control signal, the second control signal, and the third control signal is adjusted to 120 degrees.

8. A drive control circuit, characterized in that: The drive control circuit is used to couple with the three-phase resonant conversion circuit; The drive control circuit controls the three-phase resonant conversion circuit using the drive control method according to any one of claims 1 to 7.

9. An electronic device, characterized in that: The electronic device includes a housing and a drive control circuit connected to the housing; Wherein, the drive control circuit is the drive control circuit as claimed in claim 8.

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