Driving control method, driving control circuit and electronic equipment

Abstract

The invention discloses a driving control method, a driving control circuit and electronic equipment. The driving control method comprises the following steps: detecting whether a three-phase resonant conversion circuit is in a light load state currently; if the three-phase resonant conversion circuit is in the light load state currently, one of the first control signal, the second control signal and the third control signal is adjusted to be in 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 be within a set threshold range; and the first control signal, the second control signal and the third control signal are used for respectively adjusting the switching states of a first phase switching sub-circuit, a second phase switching sub-circuit and a third phase switching sub-circuit in the three-phase resonant conversion circuit. Through the above mode, according to the driving control method, when the three-phase resonant conversion circuit is in the light load state, it can still be guaranteed that the three-phase resonant conversion circuit has high gain, and therefore the three-phase resonant conversion circuit has wide-range load capacity and good 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 the other two 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 the three-phase interleaved parallel LLC topology, the classic wave generation method is that the three-way drive carrier is 120° apart, and the upper and lower tubes of each phase are driven in phase complementarity, that is, when the upper tube is turned on, the lower tube is turned off. However, the working range of the three phases is limited by the maximum frequency, and it cannot have good performance at a lighter load. 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] In order to solve the above technical problems, a technical solution adopted in the present application is: to provide a driving control method, which is applied to the driving control of a three-phase resonant conversion circuit, the three-phase resonant conversion circuit includes a three-phase switching circuit and a three-phase resonant output circuit, the three-phase switching circuit includes a first-phase switching subcircuit, a second-phase switching subcircuit and a third-phase switching subcircuit coupled to each other, the first-phase switching subcircuit, the second-phase switching subcircuit and the third-phase switching subcircuit are coupled to the three-phase resonant output circuit, wherein the driving 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 subcircuit, the second-phase switching subcircuit and the third-phase switching subcircuit 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 any two of the first control signal, the second control signal, and the third control signal to within a set threshold range includes: obtaining the output voltage of the three-phase resonant output circuit; using the difference between the output voltage and the target output voltage to adjust the phase difference between any two 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 any two of the first control signal, the second control signal, and the third control signal includes: within the 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 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 any two of 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, using a set monotonic function to adjust the phase of any one of the other two of the first control signal, the second control signal, and the third control signal; where the set threshold range is 0 to 180 degrees.

[0010] Among them, the first-phase switching sub-circuit includes a first switching transistor and a second switching transistor, the second-phase switching sub-circuit includes a third switching transistor and a fourth switching transistor, and the third-phase switching sub-circuit includes a fifth switching transistor and a sixth switching transistor. The first switching transistor, the second switching transistor, the third switching transistor, the fourth switching transistor, the fifth switching transistor, and the sixth switching transistor are mutually coupled and coupled to a three-phase resonant output circuit. The first control signal includes a first driving signal and a second driving signal, the second control signal includes a third driving signal and a fourth driving signal, and the third control signal includes a fifth driving signal and a sixth driving signal. The first driving signal and the second driving signal are complementary symmetric in phase, the third driving signal and the fourth driving signal are complementary symmetric in phase, and the fifth driving signal and the sixth driving signal are complementary symmetric 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 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; 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 driving signals among the first driving signal, the third driving signal, and the fifth driving 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 switching sub-circuit, the second-phase switching sub-circuit, and the third-phase switching sub-circuit includes: using the first driving signal, the second driving signal, the third driving signal, the fourth driving signal, the fifth driving signal, and the sixth driving signal to respectively adjust the switching states of the first switching transistor, the second switching transistor, the third switching transistor, the fourth switching transistor, the fifth switching transistor, and the sixth switching transistor.

[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 driving signal, the fourth driving signal, and the sixth driving 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 driving signals among the second driving signal, the fourth driving signal, and the sixth driving signal to within a set threshold range.

[0012] Among them, the driving control method includes: if the three-phase resonant conversion circuit is not in a light load state currently, adjusting the phase difference between every two of 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 the present application is: to provide 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 as described in any of the above items.

[0014] In order to solve the above technical problems, another technical solution adopted in the present 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 as 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 switch sub-circuit, the second phase switch sub-circuit and the third phase switch sub-circuit in the three-phase resonant conversion circuit, thereby effectively ensuring that the three-phase resonant conversion circuit still has a higher 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 drawings required for use in the description of the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work, among which: Figure 1 It is a flowchart of the first implementation method of the drive control method of the present application; Figure 2 It is a structural schematic diagram of a first embodiment of the drive control circuit of the present application; Figure 3 It is a waveform diagram of the phase and gain curve of the driving control signal of the three-phase resonant conversion circuit; Figure 4 yes Figure 1 A schematic diagram of the process of an embodiment of S13; Figure 5 It is a flow chart of the second implementation mode of the driving control method of the present application; Figure 6 It is a structural schematic diagram of a specific implementation method of a three-phase resonant conversion circuit; Figure 7It is a structural schematic diagram of another specific implementation of a three-phase resonant conversion circuit; Figure 8 It is a waveform diagram of the phase shift of the driving control signal of the three-phase resonant conversion circuit; Fig. 9 It is a waveform diagram of two driving control signals and resonant cavity current with a phase difference of 90 degrees corresponding to the three-phase resonant conversion circuit; Fig.10 It is a waveform diagram of two driving control signals and a resonant cavity current with a phase difference of 180 degrees corresponding to a three-phase resonant conversion circuit; Fig.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; Fig.12 It is a schematic structural diagram of an embodiment of an electronic device of the present application. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0018] The terms "first", "second" and "third" in this application are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first", "second" and "third" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. All directional indications (such as up, down, left, right, front, back...) in the implementation mode of this application are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. 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 optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

[0019] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0020] The present application is described in detail below with reference to the accompanying drawings and implementation methods.

[0021] Please refer to Figure 1 and Figure 2 ,in, Figure 1 is a flow chart of the first implementation mode of the driving 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 may include the following steps: S11: Detect whether the three-phase resonant conversion circuit is currently in a light load state.

[0022] It is understandable that the drive control method in this embodiment is specifically applied to Figure 2 The 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 article to control the first three-phase resonant conversion circuit 30.

[0023] It is worth noting that the term "coupled" in this article refers to any direct and indirect connection means. Therefore, if the first circuit is described as being coupled to the second circuit, it means that the first circuit can be directly connected to the second circuit through electrical connection or signal connection methods such as wireless transmission, optical transmission, etc., or can be indirectly connected to the second circuit through other circuits or connection means.

[0024] 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 a signal processing function, and the present application does not limit this.

[0025] 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. The present application does not limit this.

[0026] It is worth noting that light load refers to a state where the load rate is lower than the rated load, and the specific threshold value varies depending on the application scenario. In circuits or mechanical systems, a load rate lower than 30%-50% is usually considered light load. Its manifestation is related to the load type: in a constant current source, the load is light when the resistance value is small, and in a constant voltage source, the load is light when the resistance value is large.

[0027] 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.

[0028] S12: adjusting one of the first control signal, the second control signal and the third control signal to a set level state.

[0029] 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.

[0030] In some embodiments, the first control signal, the second control signal and the third control signal can specifically be one or more of any reasonable control signals such as PWM (Pulse Width Modulation) signals or PFM (Pulse Frequency Modulation) signals, and the present application does not limit this.

[0031] 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 losses.

[0032] S13: adjusting the phase difference between the first control signal, the second control signal and the other two of the third control signal to within a set threshold range.

[0033] Furthermore, the first drive control circuit 20 adjusts the phase difference between the remaining two control signals to a specific set threshold range to maintain the balance of the three-phase system and avoid overload or low efficiency of one phase. By accurately adjusting the phase difference, the energy transmission efficiency and gain can be optimized, especially under light load conditions, ensuring that the system can still operate efficiently and obtain better gain.

[0034] 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 difference between the first control signal and the second control signal by adjusting the phase of the first control signal and / or the second control signal, and keep the phase difference within a set threshold range.

[0035] Please continue reading Figure 3 , Figure 3 It is a waveform diagram of the phase and gain curve of the driving control signal of the three-phase resonant conversion circuit.

[0036] It is understandable that the output gain is changed by changing the phase difference between the first control signal and the second control signal while the switching frequencies of the first control signal, the second control signal and the third control signal remain unchanged. As the phase difference increases, the gain also increases. When the phase difference is 50%, that is, when the first control signal or the second control signal phase shifts 180 degrees, the gain is maximum. However, when the phase difference exceeds 180 degrees, as the phase continues to increase, the gain decreases. Therefore, when actually controlling the phase difference between the first control signal and the second control signal, it is necessary to control the phase difference to change within a certain range to ensure the monotonicity of the gain.

[0037] 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.

[0038] 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.

[0039] S14: using the first control signal, the second control signal and the third control signal to adjust the switch states of the first phase switch subcircuit, the second phase switch subcircuit and the third phase switch subcircuit respectively.

[0040] Furthermore, the first drive control circuit 20 uses the adjusted control signal to actually regulate the state of each phase switch subcircuit, that is, the first control signal, the second control signal and the third control signal are respectively sent to the first first-phase switch subcircuit 311, the first second-phase switch subcircuit 312 and the first third-phase switch subcircuit 313, so as to trigger the first first-phase switch subcircuit 311, the first second-phase switch subcircuit 312 and the first third-phase switch subcircuit 313 to turn on or off, that is, to turn on or off the corresponding switch elements according to the change of the corresponding control signal, so as to achieve effective management of the entire first three-phase resonant conversion circuit 30, so as to maintain a stable output voltage and efficient energy conversion and better gain under different load conditions.

[0041] 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.

[0042] It can be understood 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 subcircuit 311, the first second-phase switch subcircuit 312 and the first third-phase switch subcircuit 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.

[0043] In the above scheme, by adjusting one of the first control signal, the second control signal and the third control signal to a set level state, and adjusting the phase difference between the other two to a set threshold range, the first control signal, the second control signal and the third control signal are used to respectively adjust the switch states of the first first-phase switch subcircuit 311, the first second-phase switch subcircuit 312 and the first third-phase switch subcircuit 313 in the first three-phase resonant conversion circuit 30, so as to effectively ensure that the first three-phase resonant conversion circuit 30 still has a high gain when the first three-phase resonant conversion circuit 30 is in a light-load state, so as to have a wider range of load capacity and better performance. And 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, it not only helps to reduce energy consumption and extend the service life of the equipment, but also improves the overall stability and reliability of the system. In addition, by dynamically adjusting the control signal and its phase difference, the system's adaptability to load changes can also be enhanced, ensuring that the best performance can be maintained even when the load conditions fluctuate.

[0044] Furthermore, in one embodiment, the above S13 may specifically include: within a set threshold range, using a set monotonic function to adjust the phase of any other two of the first control signal, the second control signal and the third control signal.

[0045] 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.

[0046] The first drive control circuit 20 can specifically use a set monotonic function, such as a linear increase function, an arithmetic function or an exponential function, to calculate the specific adjustment amount of the phase difference between the control signals, so as to perform phase shift adjustment on the first control signal or the second control signal. The set monotonic function ensures that the direction of change of the output (i.e., the phase difference) is consistent with the change of the input (e.g., the error between the output voltage and the target voltage), but the change rate can be different.

[0047] In addition, the first drive control circuit 20 also needs to ensure that the adjusted phase difference remains within a set threshold range, such as a range of 0 to 180 degrees, to ensure that the first three-phase resonant conversion circuit 30 still has a higher gain when the first three-phase resonant conversion circuit 30 is in a light load state, so as to have a wider range of load capacity and better performance. If the calculated phase difference exceeds this range, measures need to be taken to limit it to a valid range (for example, the excess portion can be processed by modulo operation).

[0048] 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 the present application does not limit this.

[0049] Please continue reading Figure 4 , Figure 4 yes Figure 1 In one embodiment, the drive control method of the present application includes not only the above S11-S14, but also some more specific steps. Specifically, the above S13 may also include the following steps: S131: Obtain the output voltage of the three-phase resonant output circuit.

[0050] 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, so as to convert the physical voltage into a processable electrical signal, which is not limited in this application.

[0051] S132: using the difference between the output voltage and the target output voltage to adjust the phase difference between the other two control signals among the first control signal, the second control signal and the third control signal.

[0052] Furthermore, the first drive control circuit 20 dynamically adjusts the phase of the control signal according to actual needs to maintain or restore to the desired output voltage level, such as calculating the difference (i.e., error) between the actual output voltage of each phase and the preset target output voltage. This error reflects the deviation between the current output and the desired output, so that the phase difference between the first control signal, the second control signal, and the other two control signals in the third control signal can be dynamically adjusted according to the difference, and the phase difference is ensured to be within the set threshold range.

[0053] 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 will adjust the phase difference between the first control signal and the second control signal according to 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; on the contrary, if the output voltage is higher than the target value, the phase difference may need to be increased to reduce energy transfer. And the first drive control circuit 20 may also specifically input the difference into its internal PI (proportional integral) controller to dynamically adjust the phase of the first control signal and / or the second control signal using the PI controller, such as keeping the phase of the second control signal unchanged and dynamically adjusting the phase of the first control signal; or, keeping the phase of the first control signal unchanged and adjusting the phase of the second control signal; or, adjusting the phases of both the first control signal and the second control signal, and making the adjustment amplitudes of the two different.

[0054] 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.

[0055] It is understandable 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.

[0056] Further, the current actual output voltage is obtained from the first three-phase resonant output circuit 32 to compare the actual output voltage with the target output voltage and calculate the difference between the two (i.e., error). In the light load state, if it is detected that the output voltage deviates from the target value, any 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 to be adjusted in phase. 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 signal to increase the 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 signal to reduce the energy input.

[0057] Among them, in order to adjust the phase difference more accurately, a PI controller or other advanced control algorithms can be used to process the error signal and generate an appropriate adjustment amount accordingly. These algorithms can provide a smoother and more stable adjustment effect according to the dynamic response characteristics of the system. Based on the above analysis results, the phase setting of the corresponding control signal is updated, thereby affecting the working state of the corresponding switch subcircuit. Since the load conditions may change over time, it is necessary to continuously monitor the output voltage and continuously adjust the phase of the first control signal or the second control signal as needed to ensure that the output voltage is always within the set threshold range.

[0058] See also Figure 5 and Figure 6 ,in, Figure 5 is a flow chart of the second embodiment of the driving control method of the present application, Figure 6 1 is a schematic diagram of a three-phase resonant conversion circuit according to a specific embodiment. The driving control method of this embodiment is Figure 1 A flowchart of a detailed implementation of the drive control method in the embodiment of the present invention specifically includes the following steps: S41: Obtaining a state feedback signal in the three-phase resonant conversion circuit.

[0059] It is understandable that the driving control method in this embodiment can specifically be that the first driving control circuit 20 Figure 6 The second three-phase resonant conversion circuit 50 shown in the figure implements the drive control. The second three-phase resonant conversion circuit 50 includes a second three-phase switch circuit 51 and a second three-phase resonant output circuit 52, the second three-phase switch circuit 51 includes a second first-phase switch subcircuit 511, a second second-phase switch subcircuit 512 and a second third-phase switch subcircuit 513 coupled to each other, the second first-phase switch subcircuit 511 includes a first switch tube Q1 and a second switch tube Q2, the second second-phase switch subcircuit 512 includes a third switch tube Q3 and a fourth switch tube Q4, the second third-phase switch subcircuit 513 includes a fifth switch tube Q5 and a sixth switch tube Q6, 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 are coupled to each other, and are coupled to the second three-phase resonant output circuit 52 and the first drive control circuit 20.

[0060] Among them, the "three-phase" in this article can be understood as the second first phase switch subcircuit 511, the second second phase switch subcircuit 512 and the second third phase switch subcircuit 513, and the "two-phase" corresponds to any two phases of the second first phase switch subcircuit 511, the second second phase switch subcircuit 512 and the second third phase switch subcircuit 513.

[0061] 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.

[0062] Among them, the second end of the first switch tube Q1 is coupled to the second end of the third switch tube Q3 and the second end of the fifth switch tube Q5, and is used to couple with the first end of the power supply circuit 101 to obtain the power input vin, the third end of the first switch tube Q1 is coupled to the second end of the second switch tube Q2 and the first end of the first resonant inductor Lr1, the third end of the third switch tube Q3 is coupled to the second end of the fourth switch tube Q4 and the first end of the second resonant inductor Lr2, the third end of the fifth switch tube Q5 is coupled to the second end of the sixth switch tube Q6 and the first end of the third resonant inductor Lr3, the third end of the second switch tube Q2 is coupled to the third end of the fourth switch tube Q4 and the third end of the sixth switch tube Q6, and is used to couple with the second end of the power supply circuit 101, and the first end of each switch tube of 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 is coupled to the first drive control circuit 20, and has a freewheeling diode and a parasitic capacitor inside.

[0063] 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, the first end of the first secondary winding Ln1 The first end of the first diode D1 is coupled to the second end of the second diode D2, 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 with the load circuit 102, such as the first end of the load resistor Ro, and is used to couple with 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 with the load circuit 102, such as the second end of the load stabilizing resistor Ro.

[0064] In other embodiments, the second three-phase resonant output circuit 52 may specifically 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 specifically have at least two sub-windings; each diode in the second three-phase rectifier sub-circuit 523 may specifically be replaced by a switching tube; the second voltage-stabilized output circuit 524 may specifically 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 specifically be any other reasonable three-phase LLC resonant topology circuit topology form, which is specifically determined by the actual application scenario, and the present application does not limit this.

[0065] 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 a MOS (Metal Oxide Semiconductor Field Effect Transistor) tube, a triode, a thin film transistor or a field effect transistor or any other reasonable switch tube, and the present application does not limit this.

[0066] It is worth noting that, in order to distinguish the two ends of each switch tube except the control end, one of them is called the second end and the other is called the third end. When each switch tube is a triode, the control end, that is, the first end, can be specifically the base, the second end is the collector, and the third end is the emitter; or, the first end can also be specifically the base, the second end is the emitter, and the third end is the collector.

[0067] When the above switch 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.

[0068] 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 the present application.

[0069] Please continue to participate Figure 7 , Figure 7 It is a structural schematic diagram of another specific implementation of the three-phase resonant conversion circuit.

[0070] It is understandable that the third three-phase resonant conversion circuit 60 in this embodiment is Figure 6 The only difference between the second three-phase resonant conversion circuit 50 in the third three-phase resonant conversion circuit 60 is that the secondary side of the third three-phase isolation transformer sub-circuit 622 in the third three-phase isolation transformer sub-circuit 60 is a D (delta) type 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) type connection, and the first secondary winding Ln1, the second secondary winding Ln2, and the third secondary winding Ln3 adopt a D (delta) type connection.

[0071] 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 6The second three-phase switch circuit 51, the second first-phase switch sub-circuit 511, the second second-phase switch sub-circuit 512, the second third-phase switch 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 in the embodiment of the present invention are described in detail. Figure 6 And the related text content will not be repeated here.

[0072] 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 Y (star) type, or the primary side is D (triangle) type connection and the secondary side is D (triangle) type connection; the primary side is D (triangle) type connection and the secondary side is Y (star) type connection, and the present application does not limit this.

[0073] 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, and the present application does not limit this.

[0074] S42: Using the state feedback signal to detect whether the three-phase resonant conversion circuit is currently in a light load state.

[0075] Furthermore, the first drive control circuit 20 can determine the current load condition by processing and analyzing the collected state feedback signal. For example, if the output voltage Vo is lower than the expected value, it indicates that the load may be increased; conversely, if the output voltage Vo is higher than expected, it may be that the load is reduced. Based on this information, it is also possible to know in real time whether the load is light-loaded, heavy-loaded or unloaded, and specifically determine whether the second three-phase resonant conversion circuit 50 is currently in a light-loaded state.

[0076] 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, monitor whether the switching frequency is significantly higher than the rated resonant frequency to assist in determining the light load state; or, indirectly identify the light load by measuring the resonant cavity impedance or calculating the change in energy transfer efficiency; or, use an oscilloscope to observe whether the resonant current waveform is close to a sine wave or has discontinuous characteristics, and determine the light load state by measuring the current and voltage phase difference; or, use a digital controller to collect parameters such as input voltage, output current, switching frequency, etc. in real time, and combine a preset algorithm (such as a nonlinear multivariable model) to determine the light load state, etc. Any reasonable detection method is used to determine whether the second three-phase resonant conversion circuit 50 is currently in a light load state, and the present application does not limit this.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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 the first level state or the second level state.

[0081] 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 the corresponding fifth switch tube Q5 and the sixth switch tube Q6, one of which is normally open and the other is normally closed.

[0082] S44: 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 be within a set threshold range.

[0083] 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.

[0084] It is understandable that in order to ensure that the second three-phase resonant conversion circuit 50 has a better 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 and adjusted.

[0085] Please continue reading Figure 9-11 ,in, Fig. 9 It is a waveform diagram of two driving control signals and resonant cavity current with a phase difference of 90 degrees corresponding to the three-phase resonant conversion circuit. Fig.10 It is a waveform diagram of two driving control signals and resonant cavity current with a phase difference of 180 degrees corresponding to the three-phase resonant conversion circuit. Fig.11 It is a waveform diagram of two driving control signals and a resonant cavity current with a phase difference of 270 degrees corresponding to a three-phase resonant conversion circuit.

[0086] 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 missing a phase, and the three-phase balance can be effectively guaranteed to reduce unnecessary energy loss and harmonic interference, thereby improving the overall stability and reliability of the system.

[0087] S45: 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 switch 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.

[0088] 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 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 respectively, so as to trigger 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 to be turned on or off respectively, that is, to turn on or off the corresponding switch elements according to the changes of the corresponding control signals, so as to achieve 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.

[0089] S46: adjusting 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.

[0090] 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 in 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 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 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, especially under heavy load or normal load conditions, to achieve optimal energy transmission efficiency and stability.

[0091] 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.

[0092] 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.

[0093] Furthermore, the above S44 may specifically include: adjusting the phase difference between the other two drive signals among the second drive signal PWM2, the fourth drive signal PWM4 and the sixth drive signal PWM6 to be within a set threshold range.

[0094] 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.

[0095] This application also provides an electronic device, see Fig.12 , Fig.12 1 is a schematic diagram of the structure of an electronic device according to an embodiment of the present application. In this embodiment, the electronic device 70 includes a housing 71 and a second drive control circuit 72 connected to the housing 71 .

[0096] 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 one of the above embodiments. Figure 1-Figure 11 And the related text content will not be repeated here.

[0097] The beneficial effects of the present application are as follows: Different from the prior art, when it is detected that the three-phase resonant conversion circuit is in a light load state, the drive control method provided by the present application 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 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 in the three-phase resonant conversion circuit by using the first control signal, the second control signal, and the third control signal. Therefore, it can effectively ensure 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 wide range of load-carrying capabilities and good performance.

[0098] The above are only the embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be equally 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 comprises a three-phase switching circuit and a three-phase resonant output circuit, wherein the three-phase switching circuit comprises a first-phase switching subcircuit, a second-phase switching subcircuit and a third-phase switching subcircuit coupled to each other, wherein the first-phase switching subcircuit, the second-phase switching subcircuit and the third-phase switching subcircuit are coupled to the three-phase resonant output circuit, wherein: The drive control method comprises: 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 first control signal, the second control signal and the other two control signals among the third control signal to within a set threshold range; The first control signal, the second control signal and the third control signal are used to adjust the switching states of the first phase switch subcircuit, the second phase switch subcircuit and the third phase switch subcircuit respectively.

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 comprises: Acquiring 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, characterized in that: 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 comprises: 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 by 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 first control signal, the second control signal and the other two control signals of the third control signal to within a set threshold range comprises: 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 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, 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 coupled 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, 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 a set level state includes: adjusting one of the first drive signal, the third drive signal and the fifth drive signal to a first level state or a second level state; The step of adjusting the phase difference between the first control signal, the second control signal and the other two control signals of the third control signal to within a set threshold range comprises: adjusting the phase difference between the first drive signal, the third drive signal and the other two drive signals of the fifth drive signal to within the set threshold range; 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: 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 are used 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.

7. The driving control method according to claim 6, 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 first control signal, the second control signal and the other two control signals of the third control signal to within a set threshold range comprises: 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.

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

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

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

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