Magnetic integrated trans-inductor voltage regulator circuit, control method, and device

Abstract

The present application discloses a magnetic integrated trans-inductor voltage regulator (TLVR) circuit, a control method, and a device. The magnetic integrated TLVR circuit comprises a plurality of half-bridge circuits and a plurality of TLVR inductors, wherein the plurality of half-bridge circuits include a first half-bridge circuit to an M-th half-bridge circuit which are sequentially arranged; the first half-bridge circuit to the M-th half-bridge circuit are classified into at least one circuit group; the circuit group comprises at least two half-bridge circuits which are adjacent in sequence; the TLVR inductors connected to the half-bridge circuits in any circuit group share a magnetic core so as to be integrated into a magnetic integrated TLVR inductor. In addition, on the basis of the connection mode of the half-bridge circuits and the TLVR inductors, and the winding directions of a primary winding and a secondary winding in any magnetic integrated TLVR inductor, the magnetic flux in a common magnetic core region between adjacent TLVR inductors among the magnetic integrated TLVR inductors can be partially or completely counteracted, thereby reducing the volume of the common magnetic core region, facilitating reducing the overall volume of the magnetic integrated TLVR inductor, and reducing the loss of the magnetic integrated TLVR inductor.

Description

A magnetic integrated trans-inductor voltage regulator circuit, control method and device

[0001] Cross-reference to related applications

[0002] This application claims priority to the Chinese Patent Application No. 202410888852.2, filed on July 3, 2024, and entitled "A Magnetic Integrated Trans-Inductor Voltage Regulator Circuit, Control Method and Device", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of chip power supply, and in particular to a magnetic integrated trans-inductor voltage regulator circuit, control method and device. BACKGROUND

[0004] With the development of technologies such as artificial intelligence and machine learning, the computing chip (e.g., Application Specific Integrated Circuit (ASIC), Central Processing Unit (CPU), Graphics Processing Unit (GPU)) of a data center has a rapidly increasing demand for computing power. Such applications require extremely large load current (e.g., current greater than 1000A) and extremely fast load dynamics (e.g., greater than 2000A / μs), which puts extremely high demands on the dynamic response performance of the switching power supply.

[0005] A trans-inductor voltage regulator (TLVR) circuit is a topology applied to a switching power supply, and the TLVR circuit usually uses a TLVR inductor similar to a transformer as an output inductor. Currently, the TLVR inductor in a TLVR circuit is separate, resulting in a large total TLVR inductor volume, which is not conducive to miniaturization and modularization of the switching power supply to be close to the computing chip layout. In another TLVR circuit, the TLVR inductor is integrated, but the integrated implementation is negative coupling, which weakens the dynamic performance of the TLVR circuit and easily causes the magnetic core to be easily saturated due to unbalanced current, with the risk of burning the tube. However, in order to reduce the risk of magnetic core saturation, the width of the magnetic core needs to be increased, resulting in an increase in the volume of the magnetic core, which leads to an increase in the volume of the magnetic integrated TLVR inductor, which is also not conducive to miniaturization and modularization of the switching power supply to be close to the computing chip layout. SUMMARY

[0006] The application provides a magnetic integrated cross-inductor voltage regulator circuit, a control method and equipment, to reduce the overall volume of TLVR inductors in the TLVR circuit on the basis of ensuring that the TLVR circuit realizes high dynamic response, thereby facilitating miniaturization and modularization of the switching power supply to be close to the layout of the computing chip.

[0007] In a first aspect, the embodiments of the application provide a magnetic integrated TLVR circuit, which comprises a plurality of half-bridge circuits and a plurality of TLVR inductors. The first end of any half-bridge circuit is connected to a power input end, and the second end of any half-bridge circuit is connected to a ground end. The plurality of TLVR inductors correspond to the plurality of half-bridge circuits one by one, the switching node of any half-bridge circuit is connected to the first end of the primary winding of the corresponding TLVR inductor, and the second end of the primary winding of any TLVR inductor is connected to a power output end. In this way, the secondary windings of the plurality of TLVR inductors and the compensation loop inductors are connected in series to form a series loop, and the series loop is connected to the ground end, so that by designing a suitable inductance value of the compensation loop inductor, high steady-state inductance and low transient inductance can be realized, low current ripple, high efficiency, and high transient response speed can be realized.

[0008] In addition, the plurality of half-bridge circuits comprises sequentially arranged 1st half-bridge circuit to Mth half-bridge circuit, the 1st half-bridge circuit to the Mth half-bridge circuit is divided into at least one circuit group, the circuit group comprises at least two half-bridge circuits sequentially adjacent to each other, and the TLVR inductors connected by the half-bridge circuits in any circuit group share a magnetic core to be integrated into one magnetic integrated TLVR inductor, so as to reduce the overall volume of the TLVR inductor.

[0009] In addition, in any magnetic integrated TLVR inductor, the mutual inductance coupling coefficient of each primary winding is greater than zero, that is, when current flows into the first end of each primary winding, the magnetic fields generated by each primary winding have the same direction, so that weak positive coupling is formed between different primary windings in any magnetic integrated TLVR inductor, and the interference between different primary windings in any magnetic integrated TLVR inductor can be reduced. In addition, the winding direction of each primary winding from the first end to the second end is the same as the winding direction of each secondary winding from the first end to the second end, so that strong positive coupling is realized between the primary winding and the secondary winding of any TLVR inductor, the output current slope is improved by using the secondary dynamic linkage based on the series connection of the secondary windings of the TLVR inductor, the equivalent output inductance is reduced, and the change of the load current can also have a relatively fast effect on any half-bridge circuit, so that faster transient response can be realized.

[0010] In addition, in the embodiments of the present application, based on the connection mode of the half-bridge circuit and the TLVR inductor and the mutual inductance coupling coefficient of each primary winding in any magnetically integrated TLVR inductor being greater than zero, and the winding direction of the primary winding and the secondary winding, the magnetic flux in the common magnetic core region between adjacent TLVR inductors in the magnetically integrated TLVR inductor can be partially or completely canceled out when the magnetically integrated TLVR circuit is working, thereby reducing the volume of the common magnetic core region, and further reducing the volume of the magnetic core of the magnetically integrated TLVR inductor, which is conducive to reducing the overall volume of the magnetically integrated TLVR inductor and reducing the loss of the magnetically integrated TLVR inductor.

[0011] In some embodiments, in any TLVR inductor, the secondary winding is wound on the magnetic core, and the primary winding is wound on the secondary winding, and an insulating layer is arranged between the primary winding and the secondary winding to avoid short-circuiting of the primary winding and the secondary winding, so as to form a nested structure, which can further reduce the occupied space of each TLVR inductor. In addition, the nested structures in any magnetically integrated TLVR inductor can be arranged in sequence along the extension direction of the magnetic core. Thus, in combination with the above connection mode of the half-bridge circuit and the TLVR inductor, after the primary winding and the secondary winding input current, the magnetic flux in the common magnetic core between adjacent nested structures can be partially or completely canceled out, and therefore the spacing between adjacent nested structures can be set smaller, thereby further reducing the volume of the magnetically integrated TLVR inductor.

[0012] Exemplarily, the insulating layer can be a gas gap, an insulating material film layer, etc.

[0013] In some embodiments, the primary winding has a sheet-shaped first U-shaped structure, and the secondary winding has a sheet-shaped second U-shaped structure, the second U-shaped structure is arranged in the accommodation cavity of the first U-shaped structure, and the opening direction of the second U-shaped structure and the first U-shaped structure is the same. Thus, since the first U-shaped structure and the second U-shaped structure are only tightly attached through the insulating layer without containing magnetically permeable magnetic materials, the distance between the two U-shaped structures is very close and can be electrically isolated, which can make the first U-shaped structure and the second U-shaped structure have strong coupling. In addition, since the sheet-shaped first U-shaped structure and the second U-shaped structure have good connection firmness, the connection stability of the inductor device can be improved.

[0014] To improve the reliability and stability of the connection between the first U-shaped structure and the second U-shaped structure, a pin can be extended from each end of the opening of the first U-shaped structure and the second U-shaped structure to facilitate connection. In some embodiments, the primary winding further comprises a first pin and a second pin, the first pin is connected to one end of the first U-shaped structure and extends outward, and the second pin is connected to the other end of the first U-shaped structure and extends outward. In addition, the secondary winding further comprises a third pin and a fourth pin, the third pin is connected to one end of the second U-shaped structure and extends inward, and the fourth pin is connected to the other end of the second U-shaped structure and extends inward. In any TLVR inductor, the first pin and the third pin are spaced apart as a first end, and the second pin and the fourth pin are spaced apart as a second end.

[0015] In some embodiments, the first U-shaped structure, the first pin and the second pin in any primary winding can be formed as an integral structure of the same material, and the second U-shaped structure, the third pin and the fourth pin in any secondary winding can also be formed as an integral structure of the same material.

[0016] In some embodiments, the connection between the first pin, the second pin and the first U-shaped structure can be formed in a curved shape to reduce stress and improve stability, and the connection between the third pin, the fourth pin and the second U-shaped structure can also be formed in a curved shape to reduce stress and improve stability.

[0017] In some embodiments, the primary winding and the secondary winding in any magnetic integrated TLVR inductor can be embedded in a magnetic core to improve the tightness of the combination and to protect the primary winding and the secondary winding by the magnetic core.

[0018] In some embodiments, an integral die-casting process can be used to die-cast the TLVR inductor in each magnetic integrated TLVR inductor, so that each magnetic integrated TLVR inductor can be formed as an integral structure. Since the integral die-casting process directly forms the structure using a mold, it can avoid errors and deformations that may occur in traditional processing, thereby improving the accuracy and quality of the magnetic integrated TLVR inductor. In addition, the integral die-casting process has the characteristics of high automation, which can greatly improve the production efficiency and reduce labor and material costs. Furthermore, since the integral die-casting process does not require multiple processes, it can also save manufacturing time.

[0019] When the primary winding and the secondary winding transmit current, heat will be generated. If the heat cannot be dissipated in time, the overall performance of the device will be affected. In some embodiments, in order to improve the heat dissipation effect of the magnetic integrated TLVR inductor, the upper surface of the back side of the opening of each first U-shaped structure in at least one magnetic integrated TLVR inductor can be exposed outside the magnetic core.

[0020] In order to further improve the heat dissipation effect of the magnetic integrated TLVR inductor, in some embodiments, the magnetic core of at least one magnetic integrated TLVR inductor can be protrudingly arranged at the back side of the opening of each first U-shaped structure.

[0021] In some embodiments, in the magnetic integrated TLVR circuit, the leakage inductance of at least one TLVR inductor can also be designed to integrate the compensation loop inductance into the TLVR inductor in the form of leakage inductance, so as to remove the physical elements of the compensation loop inductance and further reduce the volume of the magnetic elements in the magnetic integrated TLVR circuit.

[0022] In actual application, the controller can control part or all of the half-bridge circuits to output the bus voltage of the power input end at the same time, so as to reduce the control difficulty. However, in the transient process of the magnetic integrated TLVR circuit, the simultaneous output of the bus voltage of the power input end by the multiple half-bridge circuits can cause voltage accumulation of the series-connected secondary winding, thereby causing insulation withstand voltage risk. In the embodiments of the present application, the leakage inductance is integrated into the TLVR inductor. Since the leakage inductance can generate negative voltage, the negative voltage generated by the integrated leakage inductance can also offset the voltage of the primary winding to reduce the maximum voltage of the secondary winding series loop, thereby reducing the voltage accumulation of the secondary winding series loop and being beneficial to insulation design. In addition, the control difficulty can also be reduced.

[0023] In some embodiments, an adjusting structure can be integrated into each TLVR inductor to adjust the leakage inductance of the TLVR inductor through the adjusting structure, so that the compensation loop inductance is the leakage inductance of the TLVR inductor integrated with the adjusting structure.

[0024] In some embodiments, the adjusting structure can be filled between the bending area between the first pin and the first U-shaped structure and the bending area between the third pin and the second U-shaped structure, or between the bending area between the second pin and the first U-shaped structure and the bending area between the fourth pin and the second U-shaped structure. By thus arranging, the adjusting structure is filled in the gaps, and the volume of the magnetic core or the area of the winding is not sacrificed.

[0025] In some embodiments, the adjusting structure can include a magnetic core material and an insulating material layer arranged between the magnetic core material and the primary winding and the secondary winding. In this way, the magnetic core material wrapped by the insulating material layer can be filled in the gap, the difficulty of material selection can be reduced, and the magnetic integrated TLVR inductor can be formed as an integrated structure.

[0026] In some embodiments, in the magnetic integrated TLVR circuit, the compensation loop inductance can also be implemented by a physical inductance element, so that the compensation loop inductance and the secondary winding can be arranged independently and connected by a wire.

[0027] In some embodiments, each half-bridge circuit is also connected with a controller, and in operation, the controller outputs a pulse width modulation (PWM) signal to each half-bridge circuit to control the operation of each half-bridge circuit, and in combination with the TLVR inductor, the operation of step-down conversion can be realized.

[0028] Exemplarily, each half-bridge circuit includes a first switch and a second switch connected in series between the power input terminal and the ground terminal, and the control terminal of each first switch and the control terminal of each second switch are used to connect the controller to control the operation of the first switch and the second switch in each half-bridge circuit through the controller. Specifically, the PWM signal sent by the controller to any half-bridge circuit can include a first PWM signal and a second PWM signal, wherein the first PWM signal is used to input the control terminal of the first switch, so that the first switch is turned on under the control of the effective level of the first PWM signal and is turned off under the control of the invalid level of the first PWM signal. And the second PWM signal is used to input the control terminal of the second switch, so that the second switch is turned on under the control of the effective level of the second PWM signal and is turned off under the control of the invalid level of the second PWM signal. In addition, the phase of the first PWM signal and the second PWM signal received by any half-bridge circuit is opposite, so that the first switch and the second switch in any half-bridge circuit are complementary turned on.

[0029] To this end, in an embodiment of the present application, the first half-bridge circuit to the Mth half-bridge circuit can be divided into at least two drive groups, each drive group including at least two half-bridge circuits. And, at least one half-bridge circuit needs to be spaced between the two half-bridge circuits sequentially appearing in any drive group. And, the controller can sequentially send a pulse width modulation (PWM) signal to each drive group, that is, after sending the PWM signal to each half-bridge circuit in one drive group is completed, the PWM signal is sent to each half-bridge circuit in another drive group, and the control is sequentially cycled. And, the PWM signals sent to each half-bridge circuit in each drive group sequentially have a phase difference, so that the half-bridge circuits in the same drive group can sequentially output voltages and will not output voltages at the same time. By this control, the PWM signal can be sent in an interleaved manner, the number of phases outputting high level on both sides of the midpoint of the secondary winding string circuit can be balanced, and the secondary voltage accumulation can be reduced. Further, on the basis of setting the adjustment structure, the control method can be combined to further reduce the secondary voltage accumulation.

[0030] In actual application, the electric energy output by the magnetic integrated TLVR circuit is provided to the electric device to supply power to the electric device. However, when the electric device is working, it may be in a stable energy consumption state for part of the time period, and the input current is relatively stable at this time, which indicates that the electric device is in a steady state. Based on this, the current at the power output end can be collected, and the collected current is compared with the current threshold value. If the collected current is less than the current threshold value, it indicates that the electric device is in a steady state and does not require fast dynamic response. Therefore, in an embodiment of the present application, the switching frequency of the PWM signal can be reduced to improve the efficiency of the magnetic integrated TLVR circuit. Based on this, the controller is further configured to control the interval duration between the effective levels of the two first PWM signals output sequentially in response to the current at the power output end being less than the current threshold value.

[0031] In actual application, the electric device may also suddenly load when it is in a steady state, which intensifies its energy consumption and suddenly increases its input current, which indicates that the electric device is in a dynamic state. Since the switching frequency of the PWM signal is reduced to improve the efficiency of the electric device when it is in a steady state, the dynamic response of the electric device when it suddenly loads in a steady state becomes poor. Therefore, in an embodiment of the present application, the switching frequency of the PWM signal can be increased to improve the dynamic response capability of the magnetic integrated TLVR circuit. Based on this, the controller is further configured to control the overlap duration between the effective levels of the two first PWM signals output sequentially in response to the current at the power output end being greater than or equal to the current threshold value, and control the effective levels of the first first PWM signal and the third first PWM signal output sequentially in the three first PWM signals not having an overlap duration.

[0032] During the operation, the duty cycle of the first PWM signal in the PWM signal can be adjusted to maintain the stability of the half-bridge circuit output current and the power output terminal VOUT voltage. Based on this, in some embodiments, the measurement current of the primary winding of each TLVR inductor can be collected, and the measurement voltage of the power output terminal can be collected. The controller adjusts the duty cycle of the PWM signal of the half-bridge circuit corresponding to any TLVR inductor according to the collected measurement current of the primary winding of the TLVR inductor and the measurement voltage of the power output terminal.

[0033] With the miniaturization of the switching power supply, the material of the magnetic core gradually changes from ferrite to iron powder core material with high saturation magnetic flux density. However, the inductance of the iron powder core material presents a nonlinear relationship, which brings many difficulties to the control. Therefore, in some embodiments, not only the measurement current of the primary winding of each TLVR inductor and the measurement voltage of the power output terminal are collected, but also the measurement current of the secondary winding series loop is collected. The controller can send the PWM signal to each half-bridge circuit according to the collected measurement current of the primary winding of each TLVR inductor, the measurement current of the secondary winding series loop, and the voltage of the power output terminal.

[0034] In some embodiments, several half-bridge circuits near the middle order can also be selected from the first half-bridge circuit to the Mth half-bridge circuit in sequence, and the first end or the second end of the secondary winding corresponding to these half-bridge circuits is connected to the ground terminal. This is equivalent to connecting the ground terminal to the positive and negative positions of the secondary winding series loop corresponding to the half-bridge circuits in the middle order, so that the voltage of the secondary winding series loop can be divided into two intervals, and the maximum voltage can be reduced to half of the maximum voltage of the original secondary winding series loop, thereby effectively reducing the voltage accumulation of the secondary winding series loop and facilitating the insulation design. Based on this, the controller can output the PWM signal to each half-bridge circuit at the same time, that is, the effective level of the first PWM signal of each half-bridge circuit has a partial overlap or full overlap, so that the output voltage of each half-bridge circuit can be controlled at the same time, thereby reducing the control difficulty. Alternatively, the magnetic integrated TLVR circuit can also use the aforementioned control method to further reduce the voltage accumulation of the secondary winding series loop.

[0035] In some embodiments, the number of half-bridge circuits is even, and the first end of the secondary winding of the TLVR inductor connected to the M / 2th half-bridge circuit can be connected to the ground terminal, so that the maximum voltage in the secondary winding series loop can be halved, thereby reducing the voltage accumulation. Alternatively, the first end of the secondary winding of the TLVR inductor connected to the half-bridge circuit sequentially adjacent to the M / 2th half-bridge circuit can also be connected to the ground terminal, thereby reducing the voltage accumulation.

[0036] In some embodiments, the plurality of half-bridge circuits is an odd number, and a first end of a secondary winding of a TLVR inductor connected to a (M+1) / 2th half-bridge circuit or a first end of a secondary winding of a TLVR inductor connected to a half-bridge circuit adjacent to the (M+1) / 2th half-bridge circuit is connected to a ground terminal. In this way, voltage accumulation can be reduced.

[0037] In a second aspect, the embodiments of the present application also provide a control method for controlling the magnetic integrated TLVR circuit in the first aspect or any of the embodiments of the first aspect. Each half-bridge circuit includes a first switch and a second switch connected in series between a power input terminal and a ground terminal, and a control terminal of each first switch and a control terminal of each second switch are used to connect a controller. The plurality of half-bridge circuits includes a first half-bridge circuit to an Mth half-bridge circuit arranged in sequence, and the first half-bridge circuit to the Mth half-bridge circuit are divided into at least two drive groups, each drive group includes at least two half-bridge circuits, and at least one half-bridge circuit is arranged between two half-bridge circuits arranged in sequence in any drive group. The control method includes: sequentially sending a pulse width modulation (PWM) signal to each drive group in the at least two drive groups, and the PWM signal sent to each half-bridge circuit in each drive group has a phase difference in sequence; and the PWM signal includes a first PWM signal and a second PWM signal, the first PWM signal is used to input the control terminal of the first switch, the second PWM signal is used to input the control terminal of the second switch, and the phase of the first PWM signal and the phase of the second PWM signal received by any half-bridge circuit are opposite. In this way, the number of phases outputting high level on both sides of the midpoint of the secondary winding series loop can be balanced by using the staggered sending of the PWM signal, and the secondary winding voltage accumulation can be reduced. Further, the secondary winding voltage accumulation can be further reduced by combining the control method with the adjustment structure.

[0038] With the miniaturization of the switching power supply, the material of the magnetic core gradually changes from ferrite to iron powder core material with high saturation magnetic density. However, the inductance of the iron powder core material presents a nonlinear relationship, which brings many difficulties to control. Therefore, in some embodiments, the PWM signal can be sent to each half-bridge circuit according to the measured current of each primary winding, the measured current of the series loop, and the measured voltage of the power output terminal.

[0039] In some embodiments, for the process of sending the PWM signal to each half-bridge circuit according to the measured current of each primary winding, the measured current of the series loop, and the measured voltage of the power output terminal, the process can include the following process:

[0040] In the current detection stage, the predicted current of the primary winding of each TLVR inductor is fitted according to the measured current of each primary winding, the measured current of the series loop, the measured voltage of the power output terminal, and the switching state of the PWM signal received by each half-bridge circuit.

[0041] determine a calibration current of the primary winding of each TLVR inductor according to the predicted current and the measured current of the primary winding of each TLVR inductor;

[0042] adjust a duty cycle of the first PWM signal of the half-bridge circuit connected with each TLVR inductor according to the calibration current of the primary winding of each TLVR inductor, and output the first PWM signal and the second PWM signal to the corresponding half-bridge circuit according to the adjusted duty cycle.

[0043] By the above arrangement, the non-linear inductance of the magnetic integrated TLVR circuit in the embodiments of the present application needs to be determined by the primary winding current and the secondary winding current together, that is, the primary winding current and the secondary winding current are detected simultaneously, and the total current of the primary winding and the secondary winding is used to determine the inductance of the TLVR inductor together, so that more accurate inductance information can be obtained, more accurate current estimation can be realized, more accurate calibration current can be obtained, and the control accuracy of the PWM signal can be improved, thereby improving the working stability and reliability of the magnetic integrated TLVR circuit. In addition, in the embodiments of the present application, the current loop and the overcurrent protection control function can also be performed according to the calibration current.

[0044] In some embodiments, for the process of fitting the predicted current of the primary winding of each TLVR inductor, the following process can be included:

[0045] determine the slope of the current of the series loop according to the measured current of the series loop and the switching state of the first PWM signal and the second PWM signal of each half-bridge circuit;

[0046] determine the slope of the current of the excitation inductance of the kth TLVR inductor according to the measured current of the primary winding of the kth TLVR inductor, the measured current of the series loop, and the switching state of the first PWM signal and the second PWM signal received by the half-bridge circuit connected with the kth TLVR inductor;

[0047] fit the predicted current of the primary winding of the kth TLVR inductor in the current detection stage according to the determined slope of the current of the series loop, the slope of the current of the excitation inductance of the kth TLVR inductor, and the calibration current of the primary winding of the kth TLVR inductor determined in the last detection stage.

[0048] By the above arrangement, the predicted current can be obtained by determining the slope of the current of the series loop.

[0049] In some embodiments, for the process of determining the slope of the current of the series loop according to the measured current of the series loop and the switching state of the first PWM signal and the second PWM signal of each half-bridge circuit, the following process can be included:

[0050] determining the inductance of the compensation loop according to the measured current of the series loop;

[0051] determining the slope of the current of the series loop according to the switching states of the first PWM signal and the second PWM signal received by each half-bridge circuit and the determined inductance of the compensation loop.

[0052] With the above arrangement, the slope of the current of the series loop can be calculated.

[0053] In some embodiments, for the process of determining the slope of the current of the excitation inductance of the kth TLVR inductance according to the measured current of the primary winding of the kth TLVR inductance, the measured current of the series loop, and the switching states of the first PWM signal and the second PWM signal received by the half-bridge circuit connected to the kth TLVR inductance, the process can include the following process:

[0054] determining the inductance of the excitation inductance of the kth TLVR inductance according to the measured current of the kth TLVR inductance and the measured current of the series loop;

[0055] determining the slope of the current of the excitation inductance of the kth TLVR inductance according to the switching states of the first PWM signal and the second PWM signal received by the half-bridge circuit connected to the kth TLVR inductance and the determined inductance of the excitation inductance of the kth TLVR inductance.

[0056] With the above arrangement, the slope of the current of the excitation inductance of the kth TLVR inductance can be calculated.

[0057] In some embodiments, the control method further includes, in response to the current at the power output end being less than the current threshold, controlling the interval duration between the active levels of the two first PWM signals output in sequence to improve the efficiency of the magnetic integrated TLVR circuit.

[0058] In some embodiments, the control method further includes, in response to the current at the power output end being greater than or equal to the current threshold, controlling the overlap duration between the active levels of the two first PWM signals output in sequence, and controlling the active levels of the first first PWM signal output in sequence and the third first PWM signal output in sequence among the three first PWM signals output in sequence not to have an overlap duration, to improve the dynamic response capability.

[0059] In a third aspect, the embodiments of the present application further provide a switching power supply, which comprises a controller and one or more magnetic integrated TLVR circuits. The controller is connected with each half-bridge circuit in the magnetic integrated TLVR circuit, and is configured to output a PWM signal to each half-bridge circuit to control the operation of each half-bridge circuit. The magnetic integrated TLVR circuit is the magnetic integrated TLVR circuit in the first aspect or any of the embodiments of the first aspect.

[0060] In a fourth aspect, the embodiments of the present application further provide an electronic device, which comprises a switching power supply and a power supply device. The output end of the switching power supply is connected with the power consumption device to supply power to the power consumption device.

[0061] In addition, the technical effects of the corresponding solutions in the third aspect and the fourth aspect can be obtained by referring to the technical effects of the corresponding solutions in the first aspect and the second aspect, and the repeated parts will not be described in detail. BRIEF DESCRIPTION OF DRAWINGS

[0062] FIG. 1 is a structural block diagram of an electronic device provided by the embodiments of the present application;

[0063] FIG. 2 is a circuit structure schematic diagram of a magnetic integrated TLVR circuit provided by the embodiments of the present application;

[0064] FIG. 3 is an equivalent circuit schematic diagram of the magnetic integrated TLVR circuit shown in FIG. 2;

[0065] FIG. 4 is an equivalent winding schematic diagram of the primary winding and the secondary winding in each magnetic integrated TLVR inductor of the magnetic integrated TLVR circuit shown in FIG. 2;

[0066] FIG. 5 is an equivalent schematic diagram of the primary winding, the secondary winding and the magnetic flux in one magnetic integrated TLVR inductor in the magnetic integrated TLVR circuit shown in FIG. 2;

[0067] FIG. 6a is a top view structural schematic diagram of a magnetic integrated TLVR inductor provided by the embodiments of the present application;

[0068] FIG. 6b is a sectional view structural schematic diagram along the direction of AA' in FIG. 6a;

[0069] FIG. 6c is a sectional view structural schematic diagram along the direction of BB' in FIG. 6a;

[0070] FIG. 7a is a three-dimensional structural schematic diagram of the primary winding and the secondary winding in a TLVR inductor provided by the embodiments of the present application;

[0071] FIG. 7b is a sectional view structural schematic diagram along the direction of AA' in FIG. 7a;

[0072] FIG. 8a is a three-dimensional structural schematic diagram of a magnetic integrated TLVR inductor provided by the embodiments of the present application;

[0073] Fig. 8b is a sectional view of Fig. 8a along the direction of AA';

[0074] Fig. 9a is another three-dimensional structure of the magnetic integrated TLVR inductance according to an embodiment of the present application;

[0075] Fig. 9b is a sectional view of Fig. 9a along the direction of AA';

[0076] Fig. 10a is another three-dimensional structure of the magnetic integrated TLVR inductance according to an embodiment of the present application;

[0077] Fig. 10b is a sectional view of Fig. 10a along the direction of AA';

[0078] Fig. 11 is a structure of the magnetic integrated TLVR circuit and the controller according to an embodiment of the present application;

[0079] Fig. 12 is a PWM signal received by a half-bridge circuit according to an embodiment of the present application;

[0080] Fig. 13 is a specific structure of the magnetic integrated TLVR circuit according to an embodiment of the present application;

[0081] Fig. 14a is a timing diagram of the PWM signal of the magnetic integrated TLVR circuit shown in Fig. 13;

[0082] Fig. 14b is another timing diagram of the PWM signal of the magnetic integrated TLVR circuit 120 shown in Fig. 13;

[0083] Fig. 15 is a flow chart of the control method of the magnetic integrated TLVR circuit according to an embodiment of the present application;

[0084] Fig. 16 is another circuit structure of the magnetic integrated TLVR circuit according to an embodiment of the present application;

[0085] Fig. 17a is a simulation voltage diagram according to an embodiment of the present application;

[0086] Fig. 17b is a simulation voltage diagram of the magnetic integrated TLVR circuit according to an embodiment of the present application using physical elements as compensation loop inductance;

[0087] Fig. 18a is another three-dimensional structure of the magnetic integrated TLVR inductance according to an embodiment of the present application;

[0088] Fig. 18b is a sectional view of Fig. 18a along the direction of AA';

[0089] Fig. 19 is another circuit structure of the magnetic integrated TLVR circuit according to an embodiment of the present application;

[0090] Fig. 20 is a simulation voltage diagram according to an embodiment of the present application;

[0091] FIG. 21 is another circuit structure diagram of the magnetic integrated TLVR circuit provided by the embodiments of the present application. DETAILED DESCRIPTION

[0092] For the purpose, technical solutions and advantages of the present application to be clearer, the present application will be further described in detail below with reference to the drawings. The specific operation method in the method embodiments can also be applied to the device embodiments or system embodiments. It should be noted that in the description of the present application, "at least one" refers to one or more, wherein more refers to two or more. In view of this, "more" in the embodiments of the present application can also be understood as "at least two". "And / or", which describes the association relationship of the associated objects, means that there can be three kinds of relationships, for example, A and / or B, which can represent the following three cases: A exists alone, A and B exist together, and B exists alone. In addition, the character " / ", if not specially stated, generally represents that the front and rear associated objects are in an "or" relationship. In addition, the words "first", "second", etc. are only used for the purpose of distinguishing the description and cannot be understood as indicating or implying relative importance. In addition, "connection" in the embodiments of the present application refers to electrical connection, and the connection between two electrical elements can be direct connection between the two electrical elements or indirect connection through an intermediate medium. For example, A is connected with B, which can be direct connection between A and B, or indirect connection between A and B through one or more other electrical elements, for example, A is connected with B, which can be direct connection between A and C, direct connection between C and B, and connection between A and B through C.

[0093] It should be noted that the same reference signs in the drawings of the present application represent the same or similar structures, and therefore repeated description thereof will be omitted. The expressions of position and direction described in the present application are described with reference to the drawings, but changes can also be made as needed, and the changes made are included in the protection scope of the present application. The drawings of the present application are only used to show the relative positional relationship and do not represent the true proportion.

[0094] In order to facilitate the understanding of the switching power supply, power supply method, power supply device and data center device provided by the embodiments of the present application, the application scenario thereof will be introduced first as follows.

[0095] The magnetic integrated TLVR circuit provided by the embodiments of the present application can be applied to any switching power supply for direct current (DC) voltage conversion. The switching power supply can be applied to electronic devices requiring power supply to power the power-consuming devices (i.e., loads) in the electronic devices. Exemplarily, the electronic devices include but are not limited to data center devices, information communication technology (ICT) devices. The power-consuming devices include but are not limited to computing chips. Of course, the switching power supply can also be applied to other devices (such as servers), which are not limited herein. The magnetic integrated TLVR circuit, the switching power supply, and the data center device provided by the embodiments of the present application are described below in conjunction with the accompanying drawings.

[0096] FIG. 1 is a structural block diagram of an electronic device provided by the embodiments of the present application. Referring to FIG. 1, the electronic device 1 can include a power supply device 11 and a power-consuming device 12. The power supply device 11 can include a power supply 200 and a switching power supply 100. The input end of the power supply 200 is configured to receive a power supply voltage, the output end of the power supply 200 is connected to the input end of the switching power supply 100, and the output end of the switching power supply 100 is connected to the power-consuming device 12. The power supply voltage can be alternating current of commercial power or direct current output by an energy storage device. The power supply 200 can convert the power supply voltage into direct current through voltage boosting or voltage reduction and then output to the switching power supply 100. The switching power supply 100 converts the received direct current into direct current through voltage reduction and then outputs to the power-consuming device 12 to power the power-consuming device 12. Exemplarily, the power-consuming device 12 includes but is not limited to a computing chip, and the computing chip includes but is not limited to an ASIC, a CPU, a GPU, a field programmable gate array (FPGA), a general-purpose processor, a digital signal processing (DSP), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof, or can implement or execute various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of the present application. The power-consuming device 12 described above can also be a combination of computing chips, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, etc.

[0097] The TLVR circuit is applied to a switching power supply with the advantages of transient fast response and reduced rear-end capacitor cost, and becomes a mainstream circuit for responding to fast response load fluctuation in a low-voltage and large-current application scenario. Currently, in a TLVR circuit, the TLVR inductor is separate, which leads to a large volume of the total TLVR inductor, and is not conducive to miniaturization and modularization of the switching power supply to be close to the layout of the computing chip. In another TLVR circuit, the TLVR inductor is integrated, but the integrated implementation is a negative coupling mode, which can weaken the dynamic performance of the TLVR circuit, and can easily cause the magnetic core to be saturated due to unbalanced current, and has the risk of burning the tube. However, in order to reduce the risk of magnetic core saturation, the width of the magnetic core needs to be increased, which leads to an increase in the volume of the magnetic core, resulting in an increase in the volume of the magnetic integrated TLVR inductor, which is also not conducive to miniaturization and modularization of the switching power supply to be close to the layout of the computing chip. In addition, for the inductor integration mode based on negative coupling, several-phase half-bridge circuits coupled by the same negative coupling inductor must be simultaneously turned on or turned off, which leads to inflexible phase turning on. Therefore, the embodiment of the present application provides a magnetic integrated TLVR circuit, which can realize a smaller overall volume of the TLVR inductor on the basis of realizing higher dynamic response based on a flexible control mode, thereby facilitating miniaturization and modularization of the switching power supply to be close to the layout of the computing chip.

[0098] The magnetic integrated TLVR circuit provided by the embodiment of the present application can be applied to a switching power supply, and can facilitate miniaturization and modularization of the switching power supply to be close to the layout of the computing chip on the basis of realizing higher dynamic response. Exemplarily, referring to FIG. 1, the switching power supply 100 can include a magnetic integrated TLVR circuit 120 and a controller 110. The power input end VIN of the magnetic integrated TLVR circuit 120 can be connected with the input end of the switching power supply, and the power output end VOUT of the magnetic integrated TLVR circuit 120 can be connected with the output end of the switching power supply. Moreover, the controller 110 is connected with the magnetic integrated TLVR circuit 120, and the magnetic integrated TLVR circuit 120 can be controlled to work through the controller 110, so that the magnetic integrated TLVR circuit 120 converts the received direct current into direct current after voltage reduction and then outputs to a power consumption device, thereby enabling the magnetic integrated TLVR circuit 120 provided by the embodiment of the present application to adapt to a low-voltage and large-current application scenario.

[0099] The structure and working process of the magnetic integrated TLVR circuit provided by the embodiment of the present application will be described in detail below with reference to the accompanying drawings.

[0100] Figure 2 is a schematic diagram of a circuit structure of a magnetic integrated TLVR circuit according to an embodiment of the present application. Referring to Figure 2, the magnetic integrated TLVR circuit 120 according to an embodiment of the present application can include a plurality of half-bridge circuits 121_1-121_M (K is a positive integer greater than 1) and a plurality of TLVR inductors 122_1-122_M. The first end of any half-bridge circuit 121_1-121_M is connected to a power input terminal VIN, and the second end of any half-bridge circuit 121_1-121_M is connected to a ground terminal GND. Each TLVR inductor 122_1-122_M can include a magnetic core, a primary winding 21, and a secondary winding 22 wound on the magnetic core. The plurality of TLVR inductors 122_1-122_M correspond one-to-one to the plurality of half-bridge circuits 121_1-121_M. The switching node of any half-bridge circuit 121_1-121_M is connected to the first end of the primary winding 21 of the corresponding TLVR inductor 122_1-122_M, and the second end of the primary winding 21 of any TLVR inductor 122_1-122_M is connected to a power output terminal VOUT.

[0101] The plurality of half-bridge circuits 121_1-121_M include a first half-bridge circuit 121_1 and an Mth half-bridge circuit 121_M arranged in sequence. The second end of the secondary winding 22 of the TLVR inductor 122_1 connected to the first half-bridge circuit 121_1 is connected to the first end of the secondary winding 22 of the TLVR inductor 122_M connected to the Mth half-bridge circuit 121_M. The first end of the secondary winding 22 of the TLVR inductor 122_1 connected to the first half-bridge circuit 121_1 is connected to the second end of the secondary winding 22 of the TLVR inductor 122_2 connected to the second half-bridge circuit 121_2. The first end of the secondary winding 22 of the TLVR inductor 122_M-1 connected to the M-1th half-bridge circuit 121_M-1 is connected to the second end of the secondary winding 22 of the TLVR inductor 122_M connected to the Mth half-bridge circuit 121_M. In this way, the first and last ends of the secondary windings 22 of the plurality of TLVR inductors 122_1-122_M are connected in series to form a series loop, and the series loop is connected to the ground terminal GND to achieve grounding. In addition, the series loop is also connected in series with a compensation loop inductor. By designing an appropriate inductance value of the compensation loop inductor, high steady state inductance (Lss) and low transient inductance (Ltr) are achieved, and low current ripple, high efficiency, and high transient response speed are achieved.

[0102] And, based on dividing the at least two half-bridge circuits sequentially adjacent into one circuit group, the first half-bridge circuit 121_1 to the Mth half-bridge circuit 121_M are divided into circuit groups 131_1-131_N, any circuit group 131_1-131_N can include at least two half-bridge circuits sequentially adjacent, and the TLVR inductors 23 connected to each half-bridge circuit in any circuit group 131_1-131_N are integrated into one magnetic integrated TLVR inductor 132_1-132_N. And in any magnetic integrated TLVR inductor 132_1-132_N, the winding direction of the primary winding 21 from the first end to the second end is the same as the winding direction of the secondary winding 22 from the first end to the second end. For example, taking any circuit group 131_1-131_N including two half-bridge circuits sequentially adjacent as an example, the circuit group 131_1 includes the first half-bridge circuit 121_1 and the second half-bridge circuit 121_2, and the TLVR inductor 122_1 and the TLVR inductor 122_2 are integrated to form one magnetic integrated TLVR inductor 132_1, and in the magnetic integrated TLVR inductor 132_1, the winding direction of the primary winding 21 and the secondary winding 22 of the TLVR inductor 122_1 and the TLVR inductor 122_2 from the first end to the second end are the same. ……The circuit group 131_N includes the M-1th half-bridge circuit 121_M-1 and the Mth half-bridge circuit 121_M, and the TLVR inductor 122_M-1 and the TLVR inductor 122_M are integrated to form one magnetic integrated TLVR inductor 132_N, and in the magnetic integrated TLVR inductor 132_N, the winding direction of the primary winding 21 and the secondary winding 22 of the TLVR inductor 122_M-1 and the TLVR inductor 122_M from the first end to the second end are the same. The rest is the same, and the same can be applied by analogy, which will not be repeated here.

[0103] Figure 3 is an equivalent circuit schematic diagram of the magnetic integrated TLVR circuit shown in Figure 2, and Figure 4 is an equivalent winding schematic diagram of the primary winding and the secondary winding in each magnetic integrated TLVR inductor in the magnetic integrated TLVR circuit shown in Figure 2. In the embodiments of the present application, taking any circuit group 131_1-131_N including two half-bridge circuits sequentially adjacent as an example, since the winding direction of the primary winding 21 of the TLVR inductor 122_1 and the TLVR inductor 122_2 from the first end to the second end is the same, when the first end of the primary winding 21 of the TLVR inductor 122_1 and the TLVR inductor 122_2 inputs current, the magnetic field directions generated by the primary winding 21 of the TLVR inductor 122_1 and the TLVR inductor 122_2 are the same, the mutual inductance coupling coefficient K pp1 is greater than zero, and the coupling coefficient K pp1small, so that the primary winding 21 between the TLVR inductance 122_1 and the TLVR inductance 122_2 forms a weak positive coupling, which can reduce the interference between the primary winding 21 of the TLVR inductance 122_1 and the TLVR inductance 122_2. When the first end of the primary winding 21 of the TLVR inductance 122_M-1 and the TLVR inductance 122_M inputs the current, the magnetic field generated by the primary winding 21 of the TLVR inductance 122_M-1 and the TLVR inductance 122_M is the same, and the coupling coefficient K ppN is also greater than zero, and the coupling coefficient K ppN is also small, so that the primary winding 21 between the TLVR inductance 122_M-1 and the TLVR inductance 122_M also forms a weak positive coupling, which can reduce the interference between the primary winding 21 of the TLVR inductance 122_M-1 and the TLVR inductance 122_M. The rest is the same, and can be extended in this way, which is not described here. Based on this, in the embodiment of the application, at least two TLVR inductances are integrated to form a magnetic integrated TLVR inductance, and the port of the primary winding 21 connected to the output end of each half-bridge circuit 121_1-121_M is the first end, and the winding direction of each primary winding 21 in any magnetic integrated TLVR inductance 132_1-132_N is the same from the first end to the second end. When the current is input to the first end of each primary winding 21, the magnetic field generated by each primary winding 21 is the same, so that the different primary windings 21 in any magnetic integrated TLVR inductance 132_1-132_N form a weak positive coupling, which can reduce the interference between the different primary windings 21 in any magnetic integrated TLVR inductance 132_1-132_N.

[0104] In addition, continuing to combine FIGS. 2-4, in the embodiment of the application, the winding direction of the primary winding 21 and the secondary winding 22 of any TLVR inductance 122_1-122_M from the first end to the second end is also the same, so that when the current is input to the first end of the primary winding 21 and the first end of the secondary winding 22 of any TLVR inductance 122_1-122_M, the magnetic field generated by the primary winding 21 and the secondary winding 22 is the same, that is, the mutual inductance coupling coefficient K ps is also greater than zero, and the coupling coefficient K psThe large size can enable strong positive coupling between the primary winding 21 and the secondary winding 22 of any TLVR inductor 122_1-122_M. Moreover, since the secondary windings 22 of the TLVR inductors 122_1-122_M are coupled in series, the output current slope is improved by the secondary dynamic linkage, the equivalent output inductance is reduced, and the load current variation can have a faster effect on any half-bridge circuit 121_1-121_M, and faster transient response can be achieved.

[0105] In addition, FIG. 5 is an equivalent schematic diagram of the primary winding, the secondary winding, and the magnetic flux of one magnetic integrated TLVR inductor in the magnetic integrated TLVR circuit shown in FIG. 2. In combination with FIGS. 2-5, the arrows on the primary winding 21 and the secondary winding 22 of the TLVR inductors 122_1-122_M represent the current directions thereof. Taking the magnetic integrated TLVR inductor 132_1 as an example, when the input current is applied, the direction of the magnetic flux Φ1 generated by the TLVR inductor 122_1 (i.e., the direction of the arrow on the dashed line) is opposite to the direction of the magnetic flux Φ2 generated by the TLVR inductor 122_2 (i.e., the direction of the arrow on the dashed line) in the common magnetic core 23 region GB, and thus the magnetic flux in the region GB can be partially or completely canceled. Based on this, in the embodiments of the present application, based on the connection mode of the half-bridge circuits 121_1-121_M and the TLVR inductors 122_1-122_M, and the winding directions of the primary winding 21 and the secondary winding 22 in any magnetic integrated TLVR inductor, when the magnetic integrated TLVR circuit 120 is working, the magnetic flux in the common magnetic core 23 region between adjacent TLVR inductors in the magnetic integrated TLVR inductor can be partially or completely canceled, thereby reducing the volume of the common magnetic core 23 region, and further reducing the volume of the magnetic core 23 of the magnetic integrated TLVR inductor, which is conducive to reducing the overall volume of the magnetic integrated TLVR inductor and reducing the loss of the magnetic integrated TLVR inductor.

[0106] It can be understood that the number of half-bridge circuits in any circuit group can be 2, 3, 4, or more, i.e., the number of TLVR inductors in any magnetic integrated TLVR inductor can be 2, 3, 4, or more, which can be determined according to the actual application scenario, and is not limited herein. Moreover, the divided circuit groups can be one or more, and when the circuit groups are multiple, the number of half-bridge circuits in the multiple circuit groups can be the same or different, or the number of half-bridge circuits in the multiple circuit groups can be partially the same and partially different.

[0107] The primary winding 21 and the secondary winding 22 in the embodiments of the present application can be wound on the magnetic core 23 to realize their functions. In some embodiments of the present application, referring to FIGS. 6a-6c, FIG. 6a is a top view structural schematic diagram of a magnetic integrated TLVR inductor provided by the embodiments of the present application, FIG. 6b is a sectional view structural schematic diagram of FIG. 6a along the direction of AA', and FIG. 6c is a sectional view structural schematic diagram of FIG. 6a along the direction of BB'. Taking the magnetic integrated TLVR inductor 132_1 as an example, the primary winding 21 in the TLVR inductor 122_1-122_2 can be wound half a turn on the magnetic core 23, and the winding direction of the first end to the second end of the primary winding 21 is the same, and after winding half a turn, the first end and the second end are connected to the switch node and the power output end VOUT of the corresponding half-bridge circuit respectively. The rest is the same, and the same can be applied by analogy, and will not be repeated here. In another embodiment of the present application, the primary winding 21 in any TLVR inductor can be wound one turn, two turns or more turns on the magnetic core 23, and then connected to the switch node and the power output end VOUT of the corresponding half-bridge circuit respectively.

[0108] Continuing to refer to FIGS. 6a-6c, in some embodiments of the present application, taking the magnetic integrated TLVR inductor 132_1 as an example, the secondary winding 22 in the TLVR inductor 122_1-122_2 can also be wound half a turn on the magnetic core 23, and the winding direction of the first end to the second end of the secondary winding 22 is the same, and after winding half a turn, the first end and the second end are connected to the corresponding secondary winding 22 respectively. The rest is the same, and the same can be applied by analogy, and will not be repeated here. In another embodiment of the present application, the secondary winding 22 in any TLVR inductor can be wound one turn, two turns or more turns on the magnetic core 23, and then connected to the corresponding secondary winding 22 respectively.

[0109] In specific implementation, the primary winding 21 and the secondary winding 22 of any TLVR inductor can be wound on the magnetic core 23 in various manners based on the same winding direction of the primary winding 21 and the secondary winding 22. In some embodiments of the present application, referring to FIGS. 6a-6c, the TLVR inductor 122_1 is taken as an example, the secondary winding 22 is wound on the magnetic core 23, the primary winding 21 is wound on the secondary winding 22, and the first end of the primary winding 21 and the secondary winding 22 is located on one side and the second end is located on the other side, so that the winding direction of the primary winding 21 and the secondary winding 22 is the same. In the TLVR inductor 122_1, the insulating layer 24 is arranged between the primary winding 21 and the secondary winding 22 to avoid short circuit of the primary winding 21 and the secondary winding 22. Based on this, the primary winding 21 and the secondary winding 22 in the TLVR inductor 122_1 can form a nested structure. Similarly, the primary winding 21 and the secondary winding 22 in the remaining TLVR inductors also form a nested structure. Thus, the primary winding 21 of any TLVR inductor is wound on the secondary winding 22, which can further reduce the occupied space of each TLVR inductor. Moreover, the nested structures in any magnetic integrated TLVR inductor can be arranged in sequence along the extension direction F1 of the magnetic core 23, and the magnetic flux in the common magnetic core 23 between adjacent nested structures can be partially or completely offset after the current is input to the primary winding 21 and the secondary winding 22, so that the distance between adjacent nested structures can be set smaller, thereby further reducing the volume of the magnetic integrated TLVR inductor.

[0110] It can be understood that the insulating layer 24 can be a gas gap, an insulating material film layer, etc., which is not limited herein.

[0111] Referring to FIGS. 6a-6c, the TLVR inductor 122_1 is taken as an example, the primary winding 21 can have a sheet-shaped first U-shaped structure U1, and the secondary winding 22 has a sheet-shaped second U-shaped structure U2, the second U-shaped structure U2 is arranged in the accommodating cavity of the first U-shaped structure U1, and the opening direction of the second U-shaped structure U2 and the first U-shaped structure U1 is the same, so that the primary winding 21 and the secondary winding 22 form a nested structure. Thus, the distance between the first U-shaped structure U1 and the second U-shaped structure U2 is close and electrically isolated, which can make the first U-shaped structure U1 and the second U-shaped structure U2 have strong coupling. Moreover, the sheet-shaped first U-shaped structure U1 and the second U-shaped structure U2 have good connection stability, which can improve the connection stability of the inductor.

[0112] To improve the reliability and stability of the connection between the opening of the first U-shaped structure U1 and the half-bridge circuit and the ground terminal GND, a pin can also be extended from each end of the opening of the first U-shaped structure U1 for connection through the pin. By way of example, referring to FIGS. 7a and 7b, FIG. 7a is a three-dimensional structure schematic diagram of the primary winding and the secondary winding in a TLVR inductor according to an embodiment of the present application, and FIG. 7b is a cross-sectional structure schematic diagram along the AA' direction in FIG. 7a. In any TLVR inductor, the primary winding 21 also has a sheet-shaped first pin P1 and a sheet-shaped second pin P2. The first pin P1 is connected to one end of the first U-shaped structure U1, and the first pin P1 extends outward from the opening of the first U-shaped structure U1. Also, the second pin P2 is connected to the other end of the first U-shaped structure U1, and the second pin P2 also extends outward from the opening of the first U-shaped structure U1. The first pin P1 can be used as a first terminal to connect to the switch node of the half-bridge circuit, and the second pin P2 can be used as a second terminal to connect to the ground terminal GND. Thus, because the sheet-shaped first pin P1 and the sheet-shaped second pin P2 have good connection firmness, the connection stability of the inductor can be improved.

[0113] To improve the reliability and stability of the connection between the opening of the second U-shaped structure U2 and the half-bridge circuit and the ground terminal GND, a pin can also be extended from each end of the opening of the second U-shaped structure U2 for connection through the pin. By way of example, referring to FIGS. 7a and 7b, in any TLVR inductor, the secondary winding 22 also has a sheet-shaped third pin P3 and a sheet-shaped fourth pin P4. The third pin P3 is connected to one end of the second U-shaped structure U2, and the third pin P3 extends inward from the opening of the second U-shaped structure U2. Also, the fourth pin P4 is connected to the other end of the second U-shaped structure U2, and the fourth pin P4 also extends inward from the opening of the second U-shaped structure U2. The third pin P3 can be used as a first terminal, and the fourth pin P4 can be used as a second terminal to connect the third pin P3 to the fourth pin P4 of the secondary winding 22 of one TLVR inductor, and to connect the fourth pin P4 to the third pin P3 of the secondary winding 22 of another TLVR inductor. Thus, because the sheet-shaped third pin P3 and the sheet-shaped fourth pin P4 have good connection firmness, the connection stability of the inductor can be improved.

[0114] Also, referring to FIGS. 7a and 7b, in any TLVR inductor, the first pin P1 and the third pin P3 are spaced apart to achieve insulation, and the second pin P2 and the fourth pin P4 are spaced apart to achieve insulation.

[0115] In a specific implementation, the first U-shaped structure U1, the first pin P1 and the second pin P2 in any primary winding 21 can be integrally formed structures of the same material, and the second U-shaped structure U2, the third pin P3 and the fourth pin P4 in any secondary winding 22 can also be integrally formed structures of the same material. For example, the primary winding 21 and the secondary winding 22 can be formed by bending a conductive metal sheet. It is worth mentioning that in actual applications, the primary winding 21 and the secondary winding 22 can also be other types of shapes, including irregular shapes, without affecting the implementation of the present application. In addition, the connection between the first pin P1 and the second pin P2 and the first U-shaped structure U1 is curved, which can reduce the stress at the connection and improve stability. In addition, the connection between the third pin P3 and the fourth pin P4 and the second U-shaped structure U2 is curved, which can reduce the stress at the connection and improve stability. Of course, the connection between the first pin P1 and the second pin P2 and the first U-shaped structure U1, and the connection between the third pin P3 and the fourth pin P4 and the second U-shaped structure U2 can also be set to a broken line shape, which is not limited here.

[0116] Further, the primary winding 21 and the secondary winding 22 in any magnetic integrated TLVR inductor can be embedded in the magnetic core 23 to improve the combination tightness and protect the primary winding 21 and the secondary winding 22 by the magnetic core 23. For example, referring to FIGS. 8a and 8b, FIG. 8a is a three-dimensional structure schematic diagram of a magnetic integrated TLVR inductor according to an embodiment of the present application, and FIG. 8b is a cross-sectional structure schematic diagram along the AA' direction in FIG. 8a. Taking the magnetic integrated TLVR inductor 132_1 as an example, the nested structures formed by the primary winding 21 and the secondary winding 22 of the TLVR inductors 122_1-122_2 are sequentially arranged along the extension direction F1 of the magnetic core 23. In addition, the primary winding 21 and the secondary winding 22 of the TLVR inductors 122_1-122_2 are embedded in the magnetic core 23 to protect the primary winding 21 and the secondary winding 22 of the TLVR inductors 122_1-122_2 by the magnetic core 23, and to improve the combination tightness between the magnetic core 23 and the primary winding 21 and the secondary winding 22 of the TLVR inductors 122_1-122_2.

[0117] In specific implementation, the TLVR inductor in each magnetic integrated TLVR inductor can be die-cast by using an integrated die-casting process, so that each magnetic integrated TLVR inductor can be arranged as an integrated structure. Since the integrated die-casting process is directly formed by using a mold, errors and deformations that can exist in a traditional processing process can be avoided, so that the precision and quality of the magnetic integrated TLVR inductor can be improved. Moreover, the integrated die-casting process has the characteristics of high automation, can greatly improve the production efficiency, and can reduce the labor and material costs. In addition, since the integrated die-casting process does not need to perform multiple processes, the manufacturing time can also be saved.

[0118] The magnetic core in the embodiment of the present application includes but is not limited to a magnetic core made of ferrite or a magnetic powder core made of one or more of metal magnetic, amorphous, and nanocrystalline magnetic materials. Of course, in actual application, the magnetic core can also be made of other materials, which is not limited in the present application.

[0119] When the primary winding 21 and the secondary winding 22 transmit current, heat will be generated. If the heat cannot be dissipated in time, it will affect the overall performance of the device. In the embodiment of the present application, referring to FIGS. 9a and 9b, FIG. 9a is another three-dimensional structure schematic diagram of the magnetic integrated TLVR inductor provided by the embodiment of the present application, and FIG. 9b is a cross-sectional structure schematic diagram in the AA' direction in FIG. 9a. In order to improve the heat dissipation effect of the magnetic integrated TLVR inductor, taking the magnetic integrated TLVR inductor 132_1 as an example, the first U-shaped structure U1 in the TLVR inductor 122_1-122_2 can be arranged with the upper surface S1 of the opening side of the first U-shaped structure U1 exposed outside the magnetic core 23. By this arrangement, the heat generated by the primary winding 21 and the secondary winding 22 can be directly conducted to the air through the upper surface S1, improving the heat dissipation effect of the magnetic integrated TLVR inductor 132_1. In specific implementation, part or all of the magnetic integrated TLVR inductors can be arranged in the manner of the magnetic integrated TLVR inductor 132_1, which is not limited herein.

[0120] To further improve the heat dissipation effect of the magnetic integrated TLVR inductor, referring to FIG. 10a and FIG. 10b, FIG. 10a is another three-dimensional structure schematic diagram of the magnetic integrated TLVR inductor provided by the embodiment of the present application, and FIG. 10b is a cross-sectional structure schematic diagram along the AA' direction in FIG. 10a. Taking the magnetic integrated TLVR inductor 132_1 as an example, the magnetic core 23 protrudes away from the opening side of the first U-shaped structure U1 of each primary winding 21, that is, a protruding portion TB is added to the opening side of the first U-shaped structure U1 of each primary winding 21, so as to increase the surface area of the opening side of the first U-shaped structure U1 of each primary winding 21, and further improve the heat dissipation effect of the magnetic integrated TLVR inductor 132_1. In specific implementation, part or all of the magnetic integrated TLVR inductors can be arranged in the manner of the magnetic integrated TLVR inductor 132_1, which is not limited herein.

[0121] In specific implementation, the controller 110 can be connected with each half-bridge circuit 121_1-121_M, so as to control the operation of each half-bridge circuit 121_1-121_M through the controller 110, and realize step-down conversion, so that the magnetic integrated TLVR circuit 120 provided by the embodiment of the present application can be adapted to the application scenario of low-voltage and large-current.

[0122] FIG. 11 is a structure schematic diagram of the magnetic integrated TLVR circuit and the controller provided by the embodiment of the present application. Referring to FIG. 11, the controller 110 can be connected with each half-bridge circuit 121_1-121_M. In operation, the controller 110 outputs pulse width modulation (PWM) signals SQ_1-SQ_M to each half-bridge circuit 121_1-121_M respectively, so as to control the operation of each half-bridge circuit 121_1-121_M, and in combination with the TLVR inductors 122_1-122_M, realize the operation of step-down conversion.

[0123] Exemplarily, each half-bridge circuit 121_1-121_M can include a first switch Qa and a second switch Qb connected in series between a power input terminal VIN and a ground terminal GND, for example, a first terminal of the first switch Qa is connected to the power input terminal VIN, a first terminal of the second switch Qb is connected to the ground terminal GND, a second terminal of the first switch Qa and a second terminal of the second switch Qb in each half-bridge circuit 121_1-121_M are connected to each other at a switch node. And, a control terminal of each first switch Qa and a control terminal of each second switch Qb are respectively connected to the controller 110, to control the first switch Qa and the second switch Qb in each half-bridge circuit 121_1-121_M to work through the controller 110. It can be understood that the switch in the embodiment of the present application can be one or more of a variety of types of switching devices such as a relay, a metal oxide semiconductor field effect transistor (MOSFET), a bipolar junction transistor (BJT), an insulated gate bipolar transistor (IGBT), a silicon carbide (SiC) MOSFET, etc., which will not be enumerated one by one in the embodiment of the present application. And, each switch can include a first terminal, a second terminal and a control terminal, wherein the control terminal is used to control the closing or opening of the switch. When the switch is closed, current can be transmitted between the first terminal and the second terminal of the switch. When the switch is open, current cannot be transmitted between the first terminal and the second terminal of the switch. Taking the MOSFET as an example, the control terminal of the switch is the gate, the first terminal of the switch can be the source, and the second terminal can be the drain, or the first terminal can be the drain, and the second terminal can be the source.

[0124] In the working process of the magnetic integrated TLVR circuit 120, the PWM signal sent by the controller 110 to any half-bridge circuit can include a first PWM signal and a second PWM signal. The first PWM signal is used to input the control end of the first switch Qa, so that the first switch Qa can be turned on under the control of the active level of the first PWM signal and turned off under the control of the inactive level of the first PWM signal. The second PWM signal is used to input the control end of the second switch Qb, so that the second switch Qb can be turned on under the control of the active level of the second PWM signal and turned off under the control of the inactive level of the second PWM signal. In addition, the phase of the first PWM signal and the second PWM signal received by any half-bridge circuit is opposite, so that the first switch Qa and the second switch Qb in any half-bridge circuit are complementary turned on. For example, taking the half-bridge circuit 121_1 as an example, referring to FIG. 11 and FIG. 12, FIG. 12 is a schematic diagram of the PWM signal received by a half-bridge circuit according to an embodiment of the present application. The PWM signal SQ_1 sent by the controller 110 to the half-bridge circuit 121_1 can include a first PWM signal Sa_1 and a second PWM signal Sb_1. The first PWM signal Sa_1 is input to the control end of the first switch Qa to control the turn-on and turn-off of the first switch Qa. The second PWM signal Sb_1 is input to the control end of the second switch Qb to control the turn-on and turn-off of the second switch Qb. In addition, the phase of the first PWM signal Sa_1 and the second PWM signal Sb_1 is opposite, so that the first switch Qa and the second switch Qb in the half-bridge circuit 121_1 are complementary turned on.

[0125] It is worth mentioning that the active level of the first PWM signal and the second PWM signal is high, and the inactive level is low in the above example. In addition, the duty cycle of the PWM signal can be determined according to the control requirements of the actual application scene, which is not limited herein.

[0126] In practical applications, the controller 110 can control part or all of the half-bridge circuits to output the bus voltage Vin of the power input end VIN at the same time to reduce the control difficulty. However, in the transient process, the magnetic integrated TLVR circuit 120 can cause the voltage accumulation of the series secondary winding 22 when multiple half-bridge circuits output the bus voltage Vin of the power input end VIN at the same time, thereby causing the insulation withstand voltage risk. Therefore, in an embodiment of the present application, the first half-bridge circuit to the Mth half-bridge circuit can be divided into at least two driving groups, and each driving group includes at least two half-bridge circuits. Moreover, at least one half-bridge circuit needs to be arranged between two half-bridge circuits sequentially arranged in any driving group. Moreover, the controller 110 can sequentially send the pulse width modulation (PWM) signal to each driving group, that is, after sending the PWM signal to each half-bridge circuit in one driving group, the PWM signal is sent to each half-bridge circuit in another driving group, and the control is sequentially performed in a loop. Moreover, the PWM signals sent to each half-bridge circuit in each driving group have a phase difference, so that the half-bridge circuits in the same driving group can sequentially output the voltage and cannot output the voltage at the same time. Therefore, by controlling, the PWM signal can be sent in an interleaving manner, the number of phases outputting the high level on both sides of the midpoint of the series secondary winding 22 is balanced, and the secondary winding voltage accumulation is reduced.

[0127] Exemplarily, taking M=6 as an example, with reference to FIG. 13 and FIG. 14a, FIG. 13 is a specific structural schematic diagram of the magnetic integrated TLVR circuit provided by the embodiment of the application, and FIG. 14a is a timing diagram of the PWM signal of the magnetic integrated TLVR circuit shown in FIG. 13. The first half-bridge circuit 121_1 and the fourth half-bridge circuit 121_4 are divided into a driving group CQ_1, the second half-bridge circuit 121_2 and the fifth half-bridge circuit 121_5 are divided into a driving group CQ_2, and the third half-bridge circuit 121_1 and the sixth half-bridge circuit 121_6 are divided into a driving group CQ_3. In operation, the controller 110 first sends the PWM signal SQ_1 to the first half-bridge circuit 121_1, and the PWM signal SQ_1 includes the first PWM signal Sa_1 and the second PWM signal Sb_1. Then, the controller 110 sends the PWM signal SQ_4 to the fourth half-bridge circuit 121_4, and the PWM signal SQ_4 includes the first PWM signal Sa_4 and the second PWM signal Sb_4. Then, the controller 110 sends the PWM signal SQ_2 to the second half-bridge circuit 121_2, and the PWM signal SQ_2 includes the first PWM signal Sa_2 and the second PWM signal Sb_2. Then, the controller 110 sends the PWM signal SQ_5 to the fifth half-bridge circuit 121_5, and the PWM signal SQ_5 includes the first PWM signal Sa_5 and the second PWM signal Sb_5. Then, the controller 110 sends the PWM signal SQ_3 to the third half-bridge circuit 121_3, and the PWM signal SQ_3 includes the first PWM signal Sa_3 and the second PWM signal Sb_3. Then, the controller 110 sends the PWM signal SQ_6 to the sixth half-bridge circuit 121_6, and the PWM signal SQ_6 includes the first PWM signal Sa_6 and the second PWM signal Sb_6.

[0128] In actual application, the electric energy output by the magnetic integrated TLVR circuit 120 provided in the embodiments of the present application is supplied to the electric device 12 to supply power for the electric device 12. However, when the electric device 12 is working, it may be in a stable energy consumption state for a part of time period, and the input current thereof is relatively stable, at this time, it can be indicated that the electric device 12 is in a steady state. Based on this, the current of the power output end VOUT can be collected, and the collected current is compared with the current threshold value, if the collected current is less than the current threshold value, it can be indicated that the electric device 12 is in a steady state, and a faster dynamic response is not needed, therefore, in the embodiments of the present application, the switching frequency of the PWM signal can be reduced to improve the efficiency of the magnetic integrated TLVR circuit 120. Exemplarily, the controller 110 can control that there is an interval duration between the effective levels of two adjacent first PWM signals output in sequence. For example, referring to FIG. 14a, taking the first PWM signals Sa_1 and Sa_4 as an example, after the high level of the first PWM signal Sa_1 ends, the high level of the first PWM signal Sa_4 is sent, and there is an interval duration ta between the falling edge of the high level of the first PWM signal Sa_1 and the rising edge of the high level of the first PWM signal Sa_4. Taking the first PWM signals Sa_1 and Sa_6 as an example, after the high level of the first PWM signal Sa_6 ends, the high level of the first PWM signal Sa_1 is sent, and there is an interval duration ta between the falling edge of the high level of the first PWM signal Sa_6 and the rising edge of the high level of the first PWM signal Sa_1. In this way, on the basis of reducing the accumulation of the secondary side series loop voltage, the frequency of the PWM signal in the input first half-bridge circuit 121_1 to the sixth half-bridge circuit 121_6 can be reduced, the loss is reduced, and the efficiency is improved. Further, in order to control the uniformity of the PWM signal input to each half-bridge circuit, the controller 110 can control that the interval duration between the effective levels of each two adjacent first PWM signals output in sequence is the same. Of course, in another embodiment of the present application, the controller 110 can also control that the interval duration between the effective levels of part of adjacent first PWM signals is different. It is worth mentioning that the interval duration ta can be determined according to the demand of actual application scene, which is not limited here.

[0129] In actual application, the electrical equipment 12 may also suddenly load in steady state, so that its energy consumption is intensified, and its input current suddenly increases, at this time it can be indicated that the electrical equipment 12 is in dynamic. Since the electrical equipment 12 is in steady state, in order to improve efficiency, the switching frequency of the PWM signal is reduced, but due to the reduction of the frequency, the dynamic response of the electrical equipment 12 when suddenly loading in steady state becomes poor, therefore, in the embodiment of the application, the switching frequency of the PWM signal can be increased to improve the dynamic response capability of the magnetic integrated TLVR circuit 120. Based on this, the collected current can be compared with the current threshold value, if the collected current is greater than or equal to the current threshold value, it can be indicated that the electrical equipment 12 is in dynamic, the controller 110 can control the adjacent two first PWM signals in sequence output to have an overlapping time length between the effective levels of the adjacent two first PWM signals in sequence output, and in order to avoid the first switches Qa in the half-bridge circuits close to each other in sequence from being turned on at the same time, the controller 110 also needs to control the effective levels of the first PWM signal in sequence output and the third PWM signal in sequence output among the adjacent three first PWM signals in sequence output to have no overlapping time length. For example, referring to FIG. 14b, which is another timing diagram of the PWM signal of the magnetic integrated TLVR circuit 120 shown in FIG. 13, taking the first PWM signal Sa_1 and Sa_4 as an example, the high level of the first PWM signal Sa_4 can be sent as soon as the high level of the first PWM signal Sa_1 is not ended, so that the falling edge of the high level of the first PWM signal Sa_1 appears between the rising edges of the high levels of the first PWM signal Sa_4, and the high level of the first PWM signal Sa_1 and the high level of the first PWM signal Sa_4 have an overlapping time length ta. Taking the first PWM signal Sa_1 and Sa_6 as an example, the high level of the first PWM signal Sa_1 can be sent as soon as the high level of the first PWM signal Sa_6 is not ended, so that the falling edge of the high level of the first PWM signal Sa_6 appears between the rising edges of the high levels of the first PWM signal Sa_1, and the high level of the first PWM signal Sa_6 and the high level of the first PWM signal Sa_1 have an overlapping time length ta. And taking the first PWM signal Sa_1 and Sa_2 as an example, the high level of the first PWM signal Sa_2 is sent after the high level of the first PWM signal Sa_1 is ended, and the falling edge of the high level of the first PWM signal Sa_1 and the rising edge of the high level of the first PWM signal Sa_2 have a separation time length tc. Therefore, on the basis of reducing the accumulation of the secondary side series loop voltage, the frequency of the PWM signal in the input first half-bridge circuit 121_1 to the sixth half-bridge circuit 121_6 can be increased, and the dynamic response capability can be improved. Further, in order to control the uniformity of the PWM signal input to each half-bridge circuit, the controller 110 can control the overlapping time length between the effective levels of each adjacent two first PWM signals in sequence output to be the same.Of course, in some other embodiments of the present application, the controller 110 can also be configured to control the overlap duration between the active levels of the partial adjacent first PWM signals to be different. In addition, the controller 110 can be configured to control the interval duration between the active levels of the first sequentially output first PWM signal and the third sequentially output first PWM signal in the three adjacent first PWM signals to be the same or partially different. It is worth mentioning that the overlap duration tb and the interval duration tc can be determined according to the requirements of the actual application scenario, and are not limited herein.

[0130] During operation, the duty cycle of the first PWM signal in the PWM signal can be adjusted to maintain the stability of the half-bridge circuit output current and the power output terminal VOUT voltage. Based on this, in some embodiments of the present application, referring to FIG. 13, the measurement current I P_1 ~I P_M of the primary winding 21 of each TLVR inductor 122_1-122_M can be collected, and the measurement voltage V O of the power output terminal VOUT can be collected, and the controller 110 can adjust the duty cycle of the PWM signal of the half-bridge circuit corresponding to the TLVR inductor according to the collected measurement current I P_1 ~I P_M of the primary winding 21 of any TLVR inductor 122_1-122_M and the measurement voltage V O of the power output terminal VOUT.

[0131] With the miniaturization of the switching power supply 100, the material of the magnetic core 23 gradually changes from ferrite to high-saturation magnetic density iron powder core material. However, the inductance of the iron powder core material presents a nonlinear relationship, which brings many difficulties to control. Therefore, in some embodiments of the present application, referring to FIG. 13, not only the measurement current I P_1 ~I P_M of the primary winding 21 of each TLVR inductor 122_1-122_M and the measurement voltage V O of the power output terminal VOUT are collected, but also the measurement current I Lc of the secondary winding 22 series circuit is collected, and the controller 110 can adjust the duty cycle of the PWM signal of the half-bridge circuit corresponding to the TLVR inductor according to the collected measurement current I P_1 ~I P_M of the primary winding 21 of each TLVR inductor 122_1-122_M, the measurement current I Lc of the secondary winding 22 series circuit, and the voltage V O of the power output terminal VOUT, to send the PWM signal to each half-bridge circuit.

[0132] It is understandable that since the PWM signal received by the half-bridge circuit includes a first PWM signal and a second PWM signal with opposite phases, the aforementioned adjustment of the duty cycle of the PWM signal of the half-bridge circuit refers to adjusting the duty cycle of the first PWM signal of the half-bridge circuit.

[0133] In specific implementation, referring to Figure 15, which is a flowchart of the control method of the magnetically integrated TLVR circuit in the embodiment of this application, the process of outputting a PWM signal to the half-bridge circuit provided in the embodiment of this application may include the following process:

[0134] S1. During the current testing phase, the measurement current I of the primary winding 21 of each TLVR inductor 122_1 to 122_M is collected. P_1 ~I P_M The measured current I of the secondary winding 22 series circuit Lc and the measured voltage V at the power output terminal VOUT O .

[0135] S2. Based on the measured current I of the secondary winding 22 series circuit. Lc Determine the inductance L of the compensation circuit inductor. Lc .

[0136] S3. Based on the switching states of the first and second PWM signals of each half-bridge circuit 121_1~121_M and the determined inductance L of the compensation circuit inductor... Lc Determine the slope dI of the current in the series circuit of the secondary winding 22. Lc / dt.

[0137] S4. Based on the measured current I of the kth TLVR inductor 122_k among the TLVR inductors 122_1 to 122_M. P_k The measured current I of the series circuit with secondary winding 22 Lc Determine the inductance L of the magnetizing inductor of the k-th TLVR inductor 122_k. m_k .

[0138] S5. Based on the switching states of the first and second PWM signals received by the half-bridge circuit 121_k connected to the k-th TLVR inductor 122_k, and the determined inductance L of the magnetizing inductor 122_k. m_k Determine the slope dI of the current in the magnetizing inductor of the k-th TLVR inductor 122_k. m_k / dt.

[0139] S6. Based on the determined slope dI of the current in the series circuit of the secondary winding 22. Lc The slope dI of the current in the magnetizing inductor of the kth TLVR inductor 122_k is given by / dt.m_k the calibration current I of the primary winding 21 of the kth TLVR inductor 122_k in the previous detection stage pk_cali the predicted current I of the primary winding 21 of the kth TLVR inductor 122_k in the current detection stage is fitted pk_fitting .

[0140] S7, according to the predicted current I of the primary winding 21 of the kth TLVR inductor 122_k fitted pk_fitting , and the measured current I of the primary winding 21 of the kth TLVR inductor 122_k collected P_k , the calibration current I of the primary winding 21 of the kth TLVR inductor 122_k in the current detection stage is determined pk_cali .

[0141] S8, according to the calibration current I of the primary winding 21 of the kth TLVR inductor 122_k in the current detection stage pk_cali , the duty cycle of the first PWM signal corresponding to the half-bridge circuit 121_k connected to the kth TLVR inductor 122_k is adjusted, and the first PWM signal and the second PWM signal are output to the half-bridge circuit 121_k connected to the kth TLVR inductor 122_k based on the adjusted duty cycle.

[0142] It is worth mentioning that steps S2 and S3 can be arranged before or after steps S4 and S5, or steps S2 and S3 can be performed simultaneously with steps S4 and S5, which is not limited in the present application.

[0143] Therefore, unlike the non-linear inductance of the ordinary buck circuit which only needs to be determined according to the primary winding current, the non-linear inductance of the magnetic integrated TLVR circuit in the present application needs to be determined by the primary and secondary winding currents. That is, in the present application, the primary and secondary winding currents are detected simultaneously, and the total current of the primary and secondary windings is used to determine the inductance of the TLVR inductor, so that more accurate current estimation can be achieved with more accurate inductance information, more accurate calibration current can be obtained, and the control accuracy of the PWM signal can be improved, thereby improving the working stability and reliability of the magnetic integrated TLVR circuit. In addition, in the present application, current loop and overcurrent protection control functions can also be performed according to the calibration current.

[0144] In some embodiments of the present application, in the magnetic integrated TLVR circuit 120, referring to FIG. 2, the compensation loop inductance can be implemented by a physical inductive element Lc, so that the compensation loop inductance and the secondary winding 22 can be set independently and connected by a wire. For example, referring to FIG. 2 and FIG. 3, the compensation loop inductance is connected in series between the second end of the secondary winding 22 of the TLVR inductance 122_1 and the first end of the secondary winding 22 of the TLVR inductance 122_M.

[0145] In some other embodiments of the present application, in the magnetic integrated TLVR circuit 120, the compensation loop inductance can also be integrated in the TLVR inductance by designing the leakage inductance of at least one TLVR inductance, so as to remove the physical element of the compensation loop inductance and further reduce the volume of the magnetic elements in the magnetic integrated TLVR circuit 120. For example, referring to FIG. 16, FIG. 16 is another circuit structure schematic diagram of the magnetic integrated TLVR circuit provided by the embodiments of the present application. The magnetic integrated TLVR circuit shown in FIG. 16 is improved on the basis of the magnetic integrated TLVR circuit shown in FIG. 2, and the same parts are not described here. The different parts are described as follows: no physical inductive element is set as the compensation loop inductance, but the leakage inductance L kp_1 ~L kp_M and L ks_1 ~L ks_M are integrated in each TLVR inductance 122_1~122_M to form the compensation loop inductance. It can be understood that the leakage inductance L kp_1 ~L kp_M and L ks_1 ~L ks_M are equivalent.

[0146] Since the leakage inductance can generate negative voltage, the negative voltage generated by the integrated leakage inductance can also offset the voltage of the primary winding 21 to reduce the maximum voltage of the secondary winding 22 series loop, thereby reducing the voltage accumulation of the secondary winding 22 series loop, which is conducive to insulation design. Based on this, in some examples of the present application, the controller 110 can output PWM signals to each half-bridge circuit at the same time, that is, the active level of the first PWM signal of each half-bridge circuit has a partial overlap or full overlap, so that each half-bridge circuit output voltage can be controlled at the same time, thereby reducing the control difficulty. For example, referring to FIGS. 17a and 17b, FIG. 17a is a simulation voltage schematic diagram of FIG. 16, and FIG. 17b is a simulation voltage schematic diagram of the magnetic integrated TLVR circuit in the embodiment of the present application when the physical element is used as the compensation loop inductance. In the simulation, the magnetic integrated TLVR circuit 120 has 12 TLVR inductors 122_1-122_12 and controls the output voltage of each half-bridge circuit at the same time, and the simulation process takes the voltage of the power input end VIN as 12V, the voltage of the power output end VOUT as 1V, the inductance of the excitation inductance of each TLVR inductor as 100nH, and the leakage inductance L k_1 ~L k_12 For example, referring to FIG. 17a, when each half-bridge circuit outputs voltage at the same time, it can be seen from the simulation that the maximum voltage in the secondary winding 22 series loop is 36V. Referring to FIG. 17b, when each half-bridge circuit outputs voltage at the same time, it can be seen from the simulation that the maximum voltage in the secondary winding 22 series loop is 132V. Based on this, it can be explained that through the integrated leakage inductance design, the voltage accumulation of the secondary winding 22 series loop can be reduced. In other examples of the present application, the magnetic integrated TLVR circuit 120 shown in FIG. 16 can also be controlled by the signal timing diagrams shown in FIGS. 14a and 14b, thereby further reducing the voltage accumulation of the secondary winding 22 series loop.

[0147] Exemplarily, the adjusting structure 25 can be integrated in each TLVR inductor to adjust the leakage inductance of the TLVR inductor through the adjusting structure 25, so that the compensation loop inductance is the leakage inductance of the TLVR inductor integrated with the adjusting structure 25. In some embodiments of the present application, referring to FIG. 18a and FIG. 18b, FIG. 18a is another schematic view of a three-dimensional structure of a magnetically integrated TLVR inductor provided by the embodiments of the present application, and FIG. 18b is a schematic view of a cross-sectional structure along the AA' direction in FIG. 18a. Taking the TLVR inductors 122_1-122_2 as an example, the TLVR inductors 122_1-122_2 are integrated with the adjusting structure 25, wherein the gap between the bending area between the first pin P1 and the first U-shaped structure U1 and the bending area between the third pin P3 and the second U-shaped structure U2 is filled with the adjusting structure 25, and the gap between the bending area between the second pin P2 and the first U-shaped structure U1 and the bending area between the fourth pin P4 and the second U-shaped structure U2 is filled with the adjusting structure 25. Of course, the adjusting structure 25 can also be filled between the bending area between the first pin P1 and the first U-shaped structure U1 and the bending area between the third pin P3 and the second U-shaped structure U2 of part or all of the TLVR inductors, or the adjusting structure 25 can also be filled between the bending area between the second pin P2 and the first U-shaped structure U1 and the bending area between the fourth pin P4 and the second U-shaped structure U2 of part or all of the TLVR inductors. It is worth mentioning that by filling the adjusting structure 25 in the gaps, the volume of the magnetic core 23 or the area of the winding will not be sacrificed.

[0148] Exemplarily, the adjusting structure 25 can include the magnetic core 23 material and the insulating material layer arranged between the magnetic core 23 material and the primary winding 21 and the secondary winding 22. By arranging in this way, the magnetic core 23 material wrapped by the insulating material layer can be filled in the above-mentioned gaps, which can reduce the difficulty of material selection and is conducive to forming the magnetically integrated TLVR inductor into an integral structure.

[0149] It is worth mentioning that other ways of forming the adjusting structure can also be used to adjust the leakage inductance of the TLVR inductor, which is not limited in the present application.

[0150] In some embodiments of the present application, the first end or the second end of the secondary winding 22 of the TLVR inductor 122 connected to the half-bridge circuit can be connected to the ground terminal GND, which is equivalent to connecting the secondary winding 22 of the TLVR inductor 122 to the ground at the positive or negative position of the half-bridge circuit, thereby dividing the voltage of the secondary winding 22 of the TLVR inductor 122 into two intervals, and the maximum voltage of the secondary winding 22 of the TLVR inductor 122 can be reduced to half of the original maximum voltage, thereby effectively reducing the voltage accumulation of the secondary winding 22 of the TLVR inductor 122, which is beneficial to the insulation design. Based on this, in some examples of the present application, the controller 110 can output PWM signals to each half-bridge circuit at the same time, that is, the active level of the first PWM signal of each half-bridge circuit has a partial overlap or full overlap, thereby controlling the output voltage of each half-bridge circuit at the same time, thereby reducing the control difficulty. In another example of the present application, the magnetic integrated TLVR circuit 120 can also be controlled by the signal timing diagram shown in FIG. 14a and FIG. 14b, thereby further reducing the voltage accumulation of the secondary winding 22 of the TLVR inductor 122.

[0151] In some examples, M can be an even number. For example, FIG. 19 is another circuit structure schematic diagram of the magnetic integrated TLVR circuit provided by an embodiment of the present application. The magnetic integrated TLVR circuit shown in FIG. 19 is improved on the basis of the magnetic integrated TLVR circuit shown in FIG. 2, and the same parts are not described here. The different parts are described as follows: taking M=12 as an example, the first end of the secondary winding 22 of the TLVR inductor 122 connected to the sixth half-bridge circuit 121_6 and the second end of the secondary winding 22 of the TLVR inductor 122 connected to the seventh half-bridge circuit 121_7 are connected to the ground terminal GND. By this setting, the maximum voltage of the secondary winding 22 of the TLVR inductor 122 can be effectively reduced by half. Of course, the first end of the secondary winding 22 of the TLVR inductor 122 connected to the fifth half-bridge circuit 121_5 and the second end of the secondary winding 22 of the TLVR inductor 122 connected to the sixth half-bridge circuit 121_6 can also be connected to the ground terminal GND. Alternatively, the first end of the secondary winding 22 of the TLVR inductor 122 connected to the seventh half-bridge circuit 121_7 and the second end of the secondary winding 22 of the TLVR inductor 122 connected to the eighth half-bridge circuit 121_8 can also be connected to the ground terminal GND.

[0152] For example, referring to FIG. 20, FIG. 20 is a simulation voltage diagram of FIG. 19, in the simulation, the magnetic integrated TLVR circuit 120 has 12 TLVR inductors 122_1-122_12 and controls the output voltage of each half-bridge circuit at the same time, and the simulation process takes the voltage of the power input terminal VIN as 12V, the voltage of the power output terminal VOUT as 1V, the inductance of the excitation inductance of each TLVR inductor as 100nH, and the leakage inductance L k_1 ~L k_12 For example, referring to FIG. 20, in the case of simultaneous output voltage of each half-bridge circuit, it can be seen from the simulation that the general voltage in the secondary winding 22 series loop is negative, and the general voltage is positive, thereby dividing the voltage of the secondary winding 22 series loop into two intervals of positive and negative, effectively reducing the highest voltage of the secondary winding 22 series loop, thereby reducing the voltage accumulation of the secondary winding 22 series loop.

[0153] In other examples, M can also be an odd number. For example, FIG. 21 is another circuit structure diagram of the magnetic integrated TLVR circuit provided by the embodiment of the application, the magnetic integrated TLVR circuit shown in FIG. 21 is improved on the basis of the magnetic integrated TLVR circuit shown in FIG. 2, and the same parts are not described here. The following describes the differences: taking M=13 as an example, the first end of the secondary winding 22 of the TLVR inductor 122_7 connected to the 7th half-bridge circuit 121_7 and the second end of the secondary winding 22 of the TLVR inductor 122_8 connected to the 8th half-bridge circuit 121_8 are connected to the ground terminal GND. By this setting, the highest voltage of the secondary winding 22 series loop can be effectively reduced. Of course, the first end of the secondary winding 22 of the TLVR inductor 122_6 connected to the 6th half-bridge circuit 121_6 and the second end of the secondary winding 22 of the TLVR inductor 122_7 connected to the 7th half-bridge circuit 121_7 can also be connected to the ground terminal GND. Alternatively, the first end of the secondary winding 22 of the TLVR inductor 122_8 connected to the 8th half-bridge circuit 121_8 and the second end of the secondary winding 22 of the TLVR inductor 122_9 connected to the 9th half-bridge circuit 121_9 can also be connected to the ground terminal GND.

[0154] It is worth mentioning that the various embodiments of the magnetic integrated TLVR inductor in the embodiment of the application can also not depend on the magnetic integrated TLVR circuit in the application, and can also be other realizable modes, which are not limited here.

[0155] Based on this, the embodiment of the present application also provides a control method for controlling the magnetic integrated TLVR circuit in the embodiment of the present application; wherein each half-bridge circuit comprises a first switch and a second switch connected in series between a power input end and a ground end, and the control end of each first switch and the control end of each second switch are used for connecting a controller; the plurality of half-bridge circuits comprises a first half-bridge circuit to an Mth half-bridge circuit arranged in sequence, and the first half-bridge circuit to the Mth half-bridge circuit is divided into at least two driving groups, each driving group comprises at least two half-bridge circuits, and there is at least one half-bridge circuit between two half-bridge circuits arranged in sequence in any driving group.

[0156] And the control method comprises: sending a pulse width modulation (PWM) signal to each driving group in the at least two driving groups in sequence, and the PWM signals sent to each half-bridge circuit in each driving group have a phase difference in sequence; wherein the PWM signal comprises a first PWM signal and a second PWM signal, the first PWM signal is used for inputting the control end of the first switch, the second PWM signal is used for inputting the control end of the second switch, and the phase of the first PWM signal and the second PWM signal received by any half-bridge circuit is opposite.

[0157] In some embodiments, the PWM signal is sent to each half-bridge circuit according to the measured current of each primary winding, the measured current of the series circuit and the measured voltage of the power output end.

[0158] In some embodiments, the PWM signal is sent to each half-bridge circuit according to the measured current of each primary winding, the measured current of the series circuit and the measured voltage of the power output end, comprising:

[0159] In the current detection stage, the predicted current of the primary winding of each TLVR inductor is fitted according to the measured current of each primary winding, the measured current of the series circuit, the measured voltage of the power output end and the switch state of the PWM signal received by each half-bridge circuit;

[0160] The calibration current of the primary winding of each TLVR inductor is determined according to the predicted current and the measured current of the primary winding of each TLVR inductor;

[0161] The duty cycle of the first PWM signal of the half-bridge circuit connected to each TLVR inductor is adjusted according to the calibration current of the primary winding of each TLVR inductor, and the first PWM signal and the second PWM signal are output to the corresponding half-bridge circuit according to the adjusted duty cycle.

[0162] In some embodiments, the predicted current of the primary winding of each TLVR inductor is fitted, comprising:

[0163] determining a slope of the current of the series loop according to the measured current of the series loop and the switching states of the first PWM signal and the second PWM signal of each half-bridge circuit;

[0164] determining a slope of the current of the excitation inductance of the kth TLVR inductance according to the measured current of the primary winding of the kth TLVR inductance, the measured current of the series loop, and the switching states of the first PWM signal and the second PWM signal received by the half-bridge circuit connected to the kth TLVR inductance;

[0165] fitting a predicted current of the primary winding of the kth TLVR inductance in the current detection stage according to the determined slope of the current of the series loop, the determined slope of the current of the excitation inductance of the kth TLVR inductance, and the calibrated current of the primary winding of the kth TLVR inductance determined in the last detection stage.

[0166] In some embodiments, determining a slope of the current of the series loop according to the measured current of the series loop and the switching states of the first PWM signal and the second PWM signal of each half-bridge circuit comprises:

[0167] determining a magnetizing inductance of the compensation loop inductance according to the measured current of the series loop;

[0168] determining a slope of the current of the series loop according to the switching states of the first PWM signal and the second PWM signal received by each half-bridge circuit and the determined magnetizing inductance of the compensation loop inductance.

[0169] In some embodiments, determining a slope of the current of the excitation inductance of the kth TLVR inductance according to the measured current of the primary winding of the kth TLVR inductance, the measured current of the series loop, and the switching states of the first PWM signal and the second PWM signal received by the half-bridge circuit connected to the kth TLVR inductance comprises:

[0170] determining a magnetizing inductance of the excitation inductance of the kth TLVR inductance according to the measured current of the kth TLVR inductance and the measured current of the series loop;

[0171] determining a slope of the current of the excitation inductance of the kth TLVR inductance according to the switching states of the first PWM signal and the second PWM signal received by the half-bridge circuit connected to the kth TLVR inductance and the determined magnetizing inductance of the excitation inductance of the kth TLVR inductance.

[0172] In some embodiments, the control method further includes: in response to the current of the power output end being greater than or equal to the current threshold, controlling the adjacent two first PWM signals in the sequential output to have the overlap duration between the active levels, and controlling the first sequentially output first PWM signal and the third sequentially output first PWM signal in the adjacent three first PWM signals in the sequential output to not have the overlap duration between the active levels.

[0173] In some embodiments, the control method further includes: in response to the current of the power output end being less than the current threshold, controlling the adjacent two first PWM signals in the sequential output to have the interval duration between the active levels.

[0174] The above merely provides a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which shall be covered within the protection scope of the present application.

Claims

1. A magnetic integrated TLVR circuit, characterized by, The application relates to a TLVR inductor and a TLVR inductor circuit. The TLVR inductor comprises a plurality of half-bridge circuits and a plurality of TLVR inductors. The plurality of TLVR inductors correspond to the plurality of half-bridge circuits one by one, the first end of any half-bridge circuit is connected with a power input end, the second end of any half-bridge circuit is connected with a ground end, the switch node of any half-bridge circuit is connected with the first end of the primary winding of the corresponding TLVR inductor, the second end of the primary winding of any TLVR inductor is connected with a power output end, the secondary windings of the plurality of TLVR inductors are connected in series with a compensation loop inductor to form a series loop, and the series loop is connected to the ground end. The plurality of half-bridge circuits comprise a first half-bridge circuit to an Mth half-bridge circuit arranged in sequence, the first half-bridge circuit to the Mth half-bridge circuit are divided into at least one circuit group, the circuit group comprises at least two half-bridge circuits arranged in sequence, the TLVR inductors connected with each half-bridge circuit in any circuit group share a magnetic core to be integrated into one magnetic integrated TLVR inductor, and in any magnetic integrated TLVR inductor, the mutual inductance coupling coefficient of each primary winding is greater than zero, and the winding direction of the first end to the second end of each primary winding is the same as the winding direction of the first end to the second end of each secondary winding.

2. The magnetic integrated TLVR circuit of claim 1, wherein, In any TLVR inductor, the secondary winding is wound on the magnetic core, the primary winding is wound on the secondary winding, and an insulation layer is arranged between the primary winding and the secondary winding to form a nested structure. The nested structures in any magnetic integrated TLVR inductor are arranged in sequence and spaced apart along the extension direction of the magnetic core.

3. The magnetic integrated TLVR circuit of claim 2, wherein, The primary winding has a first U-shaped structure in a sheet shape, the secondary winding has a second U-shaped structure in a sheet shape, the second U-shaped structure is arranged in a containing cavity of the first U-shaped structure, and the opening direction of the second U-shaped structure and the first U-shaped structure is the same.

4. The magnetic integrated TLVR circuit of claim 3, wherein, The primary winding further has a first pin in a sheet shape and a second pin in a sheet shape, the first pin is connected to one end of the first U-shaped structure and extends outward, and the second pin is connected to the other end of the first U-shaped structure and extends outward. The secondary winding further has a third pin in a sheet shape and a fourth pin in a sheet shape, the third pin is connected to one end of the second U-shaped structure and extends inward, and the fourth pin is connected to the other end of the second U-shaped structure and extends inward. In any TLVR inductor, the first pin and the third pin are spaced apart as the first end, and the second pin and the fourth pin are spaced apart as the second end.

5. The magnetic integrated TLVR circuit of claim 3 or 4, wherein, In any magnetic integrated TLVR inductor, the primary winding and the secondary winding are embedded in the magnetic core, or any magnetic integrated TLVR inductor is an integrally formed structure.

6. The magnetic integrated TLVR circuit of claim 5, wherein, In at least one magnetic integrated TLVR inductor, the upper surface of the side, away from the opening, of each first U-shaped structure is exposed outside the magnetic core.

7. The magnetic integrated TLVR circuit of claim 5 or 6, wherein, In at least one magnetic integrated TLVR inductor, the magnetic core is protrudingly arranged away from the opening side of each first U-shaped structure.

8. The magnetic integrated TLVR circuit of any one of claims 1-7, wherein, At least one of the TLVR inductors is integrated with an adjusting structure for adjusting leakage inductance of the TLVR inductor; the compensation loop inductor is leakage inductance of the TLVR inductor integrated with the adjusting structure.

9. The magnetic integrated TLVR circuit of any of claims 4-8, wherein, The adjusting structure is filled between the bending area between the first pin and the first U-shaped structure and the bending area between the third pin and the second U-shaped structure, or the adjusting structure is filled between the bending area between the second pin and the first U-shaped structure and the bending area between the fourth pin and the second U-shaped structure. The adjusting structure comprises a magnetic core material and an insulating material layer arranged between the magnetic core material and the primary winding and the secondary winding.

10. The magnetic integrated TLVR circuit of any one of claims 1-7, wherein, The compensation loop inductor is independently arranged with the secondary winding and is connected through a wire.

11. The magnetic integrated TLVR circuit of any one of claims 1-10, wherein, Each of the half-bridge circuits comprises a first switch and a second switch connected in series between the power input end and the ground end, and a control end of each of the first switches and a control end of each of the second switches are used for connecting a controller; The first half-bridge circuit to the Mth half-bridge circuit are divided into at least two driving groups, each of the driving groups comprises at least two half-bridge circuits, and at least one half-bridge circuit is arranged between two half-bridge circuits sequentially arranged in any of the driving groups; The controller is used for: sequentially sending a pulse width modulation (PWM) signal to each of the at least two driving groups, and the PWM signals sent to each of the half-bridge circuits in each of the driving groups sequentially have a phase difference; wherein the PWM signal comprises a first PWM signal and a second PWM signal, the first PWM signal is used for inputting the control end of the first switch, the second PWM signal is used for inputting the control end of the second switch, and the phases of the first PWM signal and the second PWM signal received by any of the half-bridge circuits are opposite.

12. The magnetic integrated TLVR circuit of claim 11, wherein, The controller is further used for: in response to the current of the power output end being less than a current threshold, controlling a time length of interval between effective levels of two adjacent first PWM signals output sequentially.

13. The magnetic integrated TLVR circuit of claim 11 or 12, wherein, The controller is further used for: in response to the current of the power output end being greater than or equal to the current threshold, controlling a time length of overlap between effective levels of two adjacent first PWM signals output sequentially, and controlling that effective levels of a first first PWM signal output first and a third first PWM signal output third in three first PWM signals output sequentially do not have a time length of overlap.

14. The magnetic integrated TLVR circuit of any of claims 11-13, wherein, The controller is further used for: sending the PWM signal to each of the half-bridge circuits according to a measured current of each of the primary windings, a measured current of the series circuit and a measured voltage of the power output end.

15. The magnetic integrated TLVR circuit of any one of claims 1-10, wherein, The plurality of half-bridge circuits is even, a first end of a secondary winding of a TLVR inductor connected with an M / 2th half-bridge circuit or a first end of a secondary winding of a TLVR inductor connected with a half-bridge circuit sequentially adjacent to the M / 2th half-bridge circuit is connected to the ground end. Alternatively, the plurality of half-bridge circuits is odd, a first end of a secondary winding of a TLVR inductor connected to an (M+1) / 2th half-bridge circuit or a first end of a secondary winding of a TLVR inductor connected to a half-bridge circuit adjacent to the (M+1) / 2th half-bridge circuit is connected to the ground terminal.

16. A control method characterized by, The control method is used for controlling the magnetic integrated TLVR circuit according to any one of claims 1-15; each of the half-bridge circuits comprises a first switch and a second switch connected in series between the power input terminal and the ground terminal, a control terminal of each of the first switches and a control terminal of each of the second switches are used for connecting a controller; the plurality of half-bridge circuits comprises a first half-bridge circuit to an Mth half-bridge circuit arranged in sequence, the first half-bridge circuit to the Mth half-bridge circuit are divided into at least two driving groups, each of the driving groups comprises at least two half-bridge circuits, and at least one half-bridge circuit is arranged between two half-bridge circuits arranged in sequence in any one of the driving groups; The control method comprises: sending a pulse width modulation (PWM) signal to each of the at least two driving groups in sequence, and the PWM signals sent to each of the half-bridge circuits in each of the driving groups have a phase difference in sequence; wherein the PWM signal comprises a first PWM signal and a second PWM signal, the first PWM signal is used for inputting the control terminal of the first switch, and the second PWM signal is used for inputting the control terminal of the second switch, and the phase of the first PWM signal and the second PWM signal received by any one of the half-bridge circuits is opposite.

17. The control method of claim 16, wherein The PWM signal is sent to each of the half-bridge circuits according to the measured current of each of the primary windings, the measured current of the series circuit and the measured voltage of the power output terminal.

18. The control method according to claim 17, characterized by, The PWM signal is sent to each of the half-bridge circuits according to the measured current of each of the primary windings, the measured current of the series circuit and the measured voltage of the power output terminal, comprising: in the current detection stage, a predicted current of the primary winding of each of the TLVR inductors is fitted according to the measured current of each of the primary windings, the measured current of the series circuit, the measured voltage of the power output terminal and the switching state of the PWM signal received by each of the half-bridge circuits; a calibration current of the primary winding of each of the TLVR inductors is determined according to the predicted current and the measured current of the primary winding of each of the TLVR inductors; a duty cycle of the first PWM signal of the half-bridge circuit connected to each of the TLVR inductors is adjusted according to the calibration current of the primary winding of each of the TLVR inductors, and the first PWM signal and the second PWM signal are output to the corresponding half-bridge circuit according to the adjusted duty cycle.

19. The control method according to claim 18, characterized by, The predicted current of the primary winding of each of the TLVR inductors is fitted, comprising: a slope of the current of the series circuit is determined according to the measured current of the series circuit and the switching state of the first PWM signal and the second PWM signal of each of the half-bridge circuits; determine a slope of the current of the excitation inductance of the kth TLVR inductor according to the measured current of the primary winding of the kth TLVR inductor, the measured current of the series loop, and the switching states of the first PWM signal and the second PWM signal received by the half-bridge circuit connected to the kth TLVR inductor; fit a predicted current of the primary winding of the kth TLVR inductor in the current detection stage according to the determined slope of the current of the series loop, the determined slope of the current of the excitation inductance of the kth TLVR inductor, and the calibrated current of the primary winding of the kth TLVR inductor determined in the last detection stage.

20. The control method of claim 19, wherein The method further comprises: determine the inductance of the compensation loop inductor according to the measured current of the series loop; determine the slope of the current of the series loop according to the measured current of the series loop and the switching states of the first PWM signal and the second PWM signal received by each half-bridge circuit.

21. The control method according to claim 19 or 20, characterized by, The method further comprises: determine the inductance of the compensation loop inductor according to the measured current of the series loop; determine the slope of the current of the series loop according to the measured current of the series loop and the switching states of the first PWM signal and the second PWM signal received by each half-bridge circuit.

22. A control method according to any one of claims 16 to 21, characterized in that, The method further comprises: determine the inductance of the excitation inductance of the kth TLVR inductor according to the measured current of the kth TLVR inductor and the measured current of the series loop; 23. A control method according to any one of claims 16 to 22, characterised by, determine the slope of the current of the excitation inductance of the kth TLVR inductor according to the switching states of the first PWM signal and the second PWM signal received by the half-bridge circuit connected to the kth TLVR inductor and the determined inductance of the excitation inductance of the kth TLVR inductor. The method further comprises:

24. A switched mode power supply characterized by in response to the current of the power output end being less than the current threshold, control the adjacent two first PWM signals in the sequence to have a time length of interval between the active levels. The method further comprises:

25. An electronic device, comprising: in response to the current of the power output end being greater than or equal to the current threshold, control the adjacent two first PWM signals in the sequence to have a time length of overlap between the active levels, and control the active levels of the first first PWM signal in the sequence and the third first PWM signal in the sequence to have no time length of overlap. The control method further comprises: the controller is connected to each half-bridge circuit in the magnetic integrated TLVR circuit, and is configured to output PWM signals to each half-bridge circuit to control the operation of each half-bridge circuit. The switching power supply comprises a power utilization device and the switching power supply of claim 24, and the output end of the switching power supply is connected to the power utilization device.

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