A multi-winding coupled inductor resonant converter and a control method thereof

Abstract

The application relates to a multi-winding coupled inductor resonant converter and a control method thereof. The converter comprises a low-voltage side bridge arm, a high-voltage side bridge arm and a three-winding coupled inductor, wherein the three-winding coupled inductor comprises a first winding, a second winding and a third winding, the high-voltage side bridge arm is connected with the first winding, and the low-voltage side bridge arm is connected with the second winding and the third winding; the low-voltage side bridge arm is used for multiplying the amplitude of an input voltage and inversely inverting the waveform of the input voltage according to a low-voltage side control signal; and the high-voltage side bridge arm is used for voltage doubling rectification on the waveform of a resonant voltage according to a high-voltage side control signal and outputs a rated output voltage. The application realizes equivalent controllable integration of multiple excitation inductors and resonant inductors through a single multi-winding coupled inductor, realizes electrical isolation and voltage gain adjustment while reducing the number of magnetic elements, reduces the circuit volume and the corresponding magnetic element loss, and improves the power density of the resonant converter.

Description

Technical Field

[0001] This invention belongs to the field of electronic circuit technology, specifically relating to a multi-winding coupled inductor resonant converter and its control method. Background Technology

[0002] With the rapid development of electric vehicles, LED drivers, and renewable energy generation systems, isolated DC-DC (Direct Current) converters are widely used. Due to the wide range of power supply or load regulation requirements and hold-up time requirements, isolated DC-DC converters need to have a wide voltage range operating capability. Resonant converters have become one of the most commonly used isolated DC-DC converters due to their high efficiency and soft-switching characteristics.

[0003] In related technologies, by adding auxiliary switches, the converter can obtain multiple voltage gain modes, but the added auxiliary switches lead to low power density. Cascaded multi-stage resonant converters can balance the voltage operating range, analysis complexity, and conversion efficiency; however, in cascaded multi-stage structures, more switches and passive components are required, along with additional drive and sampling circuits, resulting in relatively high overall size and cost. Transformer magnetizing inductors can be used as filter inductors in converters; however, this method still requires auxiliary inductors, resulting in a large number of magnetic components and consequently low power density. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that the power density of resonant converters in related technologies is low. In view of this, the present invention provides a multi-winding coupled inductor resonant converter and its control method.

[0005] The present invention includes a multi-winding coupled inductor resonant converter, comprising a low-voltage side bridge arm, a high-voltage side bridge arm, and a three-winding coupled inductor, wherein: the three-winding coupled inductor includes a first winding, a second winding, and a third winding; the high-voltage side bridge arm is connected to the first winding, and the low-voltage side bridge arm is connected to the second winding and the third winding; the low-voltage side bridge arm is used to receive an input voltage and a low-voltage side control signal, and is used to multiply the amplitude of the input voltage and perform high-frequency inversion on the waveform of the input voltage according to the low-voltage side control signal, and output a resonant voltage to the high-voltage side bridge arm through the three-winding coupled inductor; the high-voltage side bridge arm is used to receive the high-voltage side control signal and receive the resonant voltage through the three-winding coupled inductor, and is used to perform voltage multiplication rectification on the waveform of the resonant voltage according to the high-voltage side control signal, and output a rated output voltage.

[0006] Optionally, the low-voltage side bridge arm includes a first switch, a second switch, a third switch, a fourth switch, and a clamping capacitor. The low-voltage side control signal includes a first control signal, a second control signal, a third control signal, and a fourth control signal, wherein: the control terminal of the first switch is used to receive the first control signal; the control terminal of the second switch is used to receive the second control signal; the control terminal of the third switch is used to receive the third control signal; and the control terminal of the fourth switch is used to receive the fourth control signal. One end of the second winding is connected to one end of the third winding at a first node. The other end of the second winding is connected to the drain of the second switch and the source of the first switch; the other end of the third winding is connected to the drain of the fourth switch and the source of the third switch. The drain of the first switch and the drain of the third switch are connected to one end of the clamping capacitor. The source of the second switch and the source of the fourth switch, along with the other end of the clamping capacitor, are connected to a second node. The first node and the second node together are used to receive the input voltage.

[0007] Optionally, the high-voltage side bridge arm includes a fifth switch, a sixth switch, a seventh switch, an eighth switch, a resonant capacitor, a first output capacitor, and a second output capacitor. The high-voltage side control signals include a fifth control signal, a sixth control signal, a seventh control signal, and an eighth control signal, wherein: the control electrode of the fifth switch is used to receive the fifth control signal, the control electrode of the sixth switch is used to receive the sixth control signal, the control electrode of the seventh switch is used to receive the seventh control signal, and the control electrode of the eighth switch is used to receive the eighth control signal; one end of the first winding is connected to one end of the resonant capacitor. The first winding is connected to the source of the seventh switch and the drain of the eighth switch. The other end of the resonant capacitor is connected to the source of the fifth switch and the drain of the sixth switch. The drain of the fifth switch is connected to one end of the first output capacitor at a third node. The other end of the first output capacitor is connected to one end of the second output capacitor, the source of the sixth switch, and the drain of the seventh switch. The other end of the second output capacitor is connected to the source of the eighth switch at a fourth node. The third node and the fourth node are used together to output the rated output voltage.

[0008] Based on the same inventive concept, the present invention also includes a control method for a multi-winding coupled inductor resonant converter, applied to the multi-winding coupled inductor resonant converter, the method comprising: using the low-voltage side control signal and the high-voltage side control signal to make the current through the second winding equal in magnitude and opposite in direction to the current through the third winding.

[0009] Optionally, the low-voltage side bridge arm includes a first switch, a second switch, a third switch, a fourth switch, and a clamping capacitor. The low-voltage side control signal includes a first control signal, a second control signal, a third control signal, and a fourth control signal, wherein: the control terminal of the first switch is used to receive the first control signal; the control terminal of the second switch is used to receive the second control signal; the control terminal of the third switch is used to receive the third control signal; and the control terminal of the fourth switch is used to receive the fourth control signal. One end of the second winding is connected to one end of the third winding at a first node; the other end of the second winding is connected to the drain of the second switch and the source of the first switch; the other end of the third winding is connected to the drain of the fourth switch and the source of the third switch; the drain of the first switch and the drain of the third switch are connected to one end of the clamping capacitor; and the source of the second switch and the source of the fourth switch are connected to... The first node and the other end of the clamping capacitor are connected to the second node, and the first node and the second node are used together to receive the input voltage; the method further includes: calculating a duty cycle signal based on a target gain of the amplitude of the input voltage, wherein the duty cycle signal is used to adjust the duty cycle of the first control signal, the second control signal, the third control signal and the fourth control signal; providing the first control signal, the second control signal, the third control signal and the fourth control signal to the low-voltage side bridge arm based on the duty cycle signal, wherein the first control signal and the second control signal are used to reverse the conduction states of the first switch and the second switch, the third control signal and the fourth control signal are used to reverse the conduction states of the third switch and the fourth switch, the phase difference between the first control signal and the third control signal is 180 degrees, and the phase difference between the second control signal and the fourth control signal is 180 degrees.

[0010] Optionally, the step of calculating the duty cycle signal based on the target gain of the amplitude of the input voltage includes: sampling the rated output voltage of the high-voltage side bridge arm as the sampling voltage; inputting the difference between the sampling voltage and the reference voltage to the proportional-integral controller to obtain the duty cycle signal output by the proportional-integral controller, wherein the reference voltage is set according to the target gain.

[0011] Optionally, the high-voltage side bridge arm includes a fifth switch, a sixth switch, a seventh switch, an eighth switch, a resonant capacitor, a first output capacitor, and a second output capacitor. The high-voltage side control signal includes a fifth control signal, a sixth control signal, a seventh control signal, and an eighth control signal, wherein: the control terminal of the fifth switch is used to receive the fifth control signal, the control terminal of the sixth switch is used to receive the sixth control signal, the control terminal of the seventh switch is used to receive the seventh control signal, and the control terminal of the eighth switch is used to receive the eighth control signal; one end of the first winding is connected to one end of the resonant capacitor, and the other end of the first winding is connected to the source of the seventh switch and the drain of the eighth switch; the other end of the resonant capacitor is connected to the source of the fifth switch and the drain of the sixth switch; the drain of the fifth switch and one end of the first output capacitor are connected to a third node, and the other end of the first output capacitor is connected to the second... One end of the output capacitor, the source of the sixth switch, and the drain of the seventh switch are connected. The other end of the second output capacitor is connected to the source of the eighth switch at a fourth node. The third node and the fourth node are used together to output the rated output voltage. The method further includes providing the fifth control signal, the sixth control signal, the seventh control signal, and the eighth control signal to the high-voltage side bridge arm. The fifth control signal and the sixth control signal are used to reverse the conduction states of the fifth switch and the sixth switch, and the seventh control signal and the eighth control signal are used to reverse the conduction states of the seventh switch and the eighth switch. The phase difference between the fifth control signal and the seventh control signal is 180 degrees, and the phase difference between the sixth control signal and the eighth control signal is 180 degrees. The duty cycle of the fifth control signal, the sixth control signal, the seventh control signal, and the eighth control signal is 50%.

[0012] Optionally, the phase difference between the low-voltage side control signal and the high-voltage side control signal is zero.

[0013] Based on the same inventive concept, the present invention also includes an electronic device, comprising: a processor; a memory for storing executable instructions; wherein the processor is configured to read the executable instructions from the memory and execute the executable instructions to implement the method.

[0014] Based on the same inventive concept, the present invention also includes a computer-readable storage medium having a computer program stored thereon, the storage medium storing the computer program such that when the computer program is executed by a processor, the processor implements the method described thereon.

[0015] The beneficial effects of the present invention are as follows: The resonant converter provided by the present invention realizes the equivalent controllable integration of multiple excitation inductors and resonant inductors through a single multi-winding coupled inductor, thereby reducing the number of magnetic components while achieving electrical isolation and voltage gain adjustment, reducing the circuit volume and corresponding magnetic component losses, and improving the power density of the resonant converter. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the circuit principle of a multi-winding coupled inductor resonant converter provided in an embodiment of the present invention; Figure 2 A schematic diagram of the operating parameters of a multi-winding coupled inductor resonant converter provided in an embodiment of the present invention; Figure 3 A schematic diagram of the operating parameters of a multi-winding coupled inductor resonant converter provided in an embodiment of the present invention; Figure 4 A schematic diagram of the operating parameters of a multi-winding coupled inductor resonant converter provided in an embodiment of the present invention; Figure 5 A flowchart of a control method for a multi-winding coupled inductor resonant converter provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the hardware structure of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0019] To better understand the above-mentioned objectives, features, and advantages of the embodiments of the present invention, the solutions of the embodiments of the present invention will be further described below. It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other.

[0020] Many specific details are set forth in the following description in order to provide a full understanding of the embodiments of the present invention, but the embodiments of the present invention may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of the embodiments of the present invention, and not all embodiments.

[0021] This invention provides a multi-winding coupled inductor resonant converter, specifically a DC-DC converter, such as... Figure 1 As shown, it includes a low-voltage side bridge arm A1, a high-voltage side bridge arm A2, and a three-winding coupled inductor, wherein: The three-winding coupled inductor includes a first winding N1, a second winding N2, and a third winding N3. The high-voltage side bridge arm A2 is connected to the first winding N1, and the low-voltage side bridge arm A1 is connected to the second winding N2 and the third winding N3.

[0022] The low-voltage side bridge arm A1 receives the input voltage Vi and the low-voltage side control signal. It then multiplies the amplitude of the input voltage Vi and performs high-frequency inversion on the waveform of Vi based on the control signal, outputting a resonant voltage to the high-voltage side bridge arm A2 via a three-winding coupled inductor. Specifically, as shown... Figure 1 As shown, the low-voltage side arm A1 includes multiple switching transistors, and the low-voltage side control signal includes switching signals provided to the control electrodes of the multiple switching transistors. The same applies to the high-voltage side arm A2 described below.

[0023] The high-voltage side bridge arm A2 is used to receive the high-voltage side control signal and the resonant voltage through the three-winding coupling inductor. The high-voltage side bridge arm A2 is used to perform voltage doubler rectification on the waveform of the resonant voltage according to the high-voltage side control signal and output the rated output voltage Vo.

[0024] The three-winding coupled inductor provided in this embodiment of the invention consists of two primary windings (the second winding N2 and the third winding N3 mentioned above) and one secondary winding (the first winding N1 mentioned above). The first winding N1, the second winding N2, and the third winding N3 are wound on the same EE magnetic core. When current flows through the two primary windings, magnetic flux is generated in the magnetic core. The magnitude of the magnetic flux is related to the current and the number of turns in the primary windings. This magnetic flux is coupled to the secondary windings through the magnetic core. The current flowing through the primary windings can be adjusted through the low-voltage side bridge arm A1, thereby adjusting the change in magnetic flux in the magnetic core, so as to obtain the required voltage and / or current at the secondary windings and provide energy for different loads. The resonant converter provided in this embodiment of the invention achieves equivalent controllable integration of multiple excitation inductors and resonant inductors through a single multi-winding coupled inductor. While reducing the number of magnetic components, it achieves electrical isolation and voltage gain adjustment, reduces the circuit size and corresponding magnetic component losses, and improves the power density of the resonant converter. The resonant converter provided in this embodiment of the invention can also replace the two DC inductors, one high-frequency transformer and one external series resonant inductor in the current-type resonant converter in related technologies with a single multi-winding coupled inductor, which has the advantage of low input current ripple and can also achieve electrical isolation.

[0025] In one specific embodiment, such as Figure 1As shown, the low-voltage side bridge arm A1 includes a first switch T1, a second switch T2, a third switch T3, a fourth switch T4, and a clamping capacitor Cb. The low-voltage side control signals include a first control signal S1, a second control signal S2, a third control signal S3, and a fourth control signal S4 (not shown in the control signal diagram), wherein: The control electrode of the first switch T1 is used to receive the first control signal S1, the control electrode of the second switch T2 is used to receive the second control signal S2, the control electrode of the third switch T3 is used to receive the third control signal S3, and the control electrode of the fourth switch T4 is used to receive the fourth control signal S4. The first control signal S1, the second control signal S2, the third control signal S3, and the fourth control signal S4 are used to control the conduction or cutoff of the first switch T1, the second switch T2, the third switch T3, and the fourth switch T4, respectively. The relationship between the control signals and the switches is similar and will not be repeated.

[0026] One end of the second winding N2 and one end of the third winding N3 are connected to the first node n1.

[0027] The other end of the second winding N2 is connected to the drain of the second switch T2 and the source of the first switch T1 at node a, and the other end of the third winding N3 is connected to the drain of the fourth switch T4 and the source of the third switch T3 at node b.

[0028] The drain of the first switching transistor T1 is connected to the drain of the third switching transistor T3 and one end of the clamping capacitor Cb. The clamping voltage Vb on the clamping capacitor Cb is the resonant voltage mentioned above.

[0029] The source of the second switch T2 and the source of the fourth switch T4, as well as the other end of the clamping capacitor Cb, are connected to the second node n2. The first node n1 and the second node n2 are used together to receive the input voltage Vi. Specifically, the first node n1 is used to receive the positive terminal of the input voltage Vi, and the second node n2 is used to receive the negative terminal of the input voltage Vi.

[0030] In practice, by controlling the on and off of the first switch T1, the second switch T2, the third switch T3, and the fourth switch T4, the current flowing through the second winding N2 and the third winding N3 can be adjusted, thereby adjusting the change in magnetic flux in the magnetic core, multiplying the amplitude of the input voltage Vi, and performing high-frequency inversion on the waveform of the input voltage Vi.

[0031] In one specific embodiment, such as Figure 1As shown, the high-voltage side bridge arm A2 includes a fifth switch T5, a sixth switch T6, a seventh switch T7, an eighth switch T8, a resonant capacitor Cr, a first output capacitor Co1, and a second output capacitor Co2. The high-voltage side control signals include a fifth control signal S5, a sixth control signal S6, a seventh control signal S7, and an eighth control signal S8 (not shown in the control signal diagram), wherein: The control electrode of the fifth switch T5 is used to receive the fifth control signal S5, the control electrode of the sixth switch T6 is used to receive the sixth control signal S6, the control electrode of the seventh switch T7 is used to receive the seventh control signal S7, and the control electrode of the eighth switch T8 is used to receive the eighth control signal S8.

[0032] One end of the first winding N1 is connected to one end of the resonant capacitor Cr. The other end of the first winding N1 is connected to the source of the seventh switch T7 and the drain of the eighth switch T8 at node d. The other end of the resonant capacitor Cr is connected to the source of the fifth switch T5 and the drain of the sixth switch T6 at node c.

[0033] The resonant capacitor Cr, together with the first winding N1, forms a resonant circuit, enabling the circuit to operate at high frequencies, thereby improving efficiency. At the same time, the resonant capacitor Cr also plays a role in energy storage and filtering, helping to stabilize the operating frequency of the circuit and reduce switching noise.

[0034] The drain of the fifth switch T5 and one end of the first output capacitor Co1 are connected to the third node n3. The other end of the first output capacitor Co1 is connected to one end of the second output capacitor Co2, the source of the sixth switch T6, and the drain of the seventh switch T7. The other end of the second output capacitor Co2 is connected to the source of the eighth switch T8 at the fourth node n4. The third node n3 and the fourth node n4 are used together to output the rated output voltage Vo. Specifically, the third node n3 is used to output the positive terminal of the rated output voltage Vo, and the fourth node n4 is used to output the negative terminal of the rated output voltage Vo.

[0035] The first output capacitor Co1 and the second output capacitor Co2 are mainly used to smooth the output voltage and reduce the output voltage ripple. The output capacitors can store energy and provide instantaneous current when the load current changes, thereby maintaining the stability of the output voltage.

[0036] Specifically, the high-voltage side bridge arm A2 is a three-level bridge arm. A three-level bridge arm can provide more voltage levels, thereby improving the accuracy and efficiency of voltage conversion. It can also provide a higher quality output waveform, reduce switching losses, and improve the overall efficiency of the circuit. For example... Figure 1As shown, the combination of the fifth switch T5, the sixth switch T6, the seventh switch T7, and the eighth switch T8 can produce three different output levels. When the fifth switch T5 and the sixth switch T6 are on, and the seventh switch T7 and the eighth switch T8 are off, the output of the high-voltage side bridge arm A2 is positive. When the fifth switch T5 and the sixth switch T6 are off, and the seventh switch T7 and the eighth switch T8 are on, the output of the high-voltage side bridge arm A2 is negative. When the fifth switch T5 and the eighth switch T8 are on, or the sixth switch T6 and the seventh switch T7 are on, the output level of the high-voltage side bridge arm A2 is zero.

[0037] Based on the same inventive concept, corresponding to the resonant converter provided in any of the above embodiments, the present invention also provides a control method for a multi-winding coupled inductor resonant converter, applied to the multi-winding coupled inductor resonant converter in any of the above embodiments, the method comprising: By using the low-voltage side control signal and the high-voltage side control signal, the current through the second winding N2 is made to be equal in magnitude and opposite in direction to the current through the third winding N3. As a result, there is no phase difference between the currents, and they can cancel each other out on the voltage input side to achieve low ripple in the output current.

[0038] In some embodiments, the above method further includes: The duty cycle signal is calculated based on the target gain of the input voltage Vi. This duty cycle signal is used to adjust the duty cycles of the first control signal S1, the second control signal S2, the third control signal S3, and the fourth control signal S4.

[0039] Based on the duty cycle signal, a first control signal S1, a second control signal S2, a third control signal S3, and a fourth control signal S4 are provided to the low-voltage side bridge arm A1, wherein, as... Figures 2 to 4 As shown, the first control signal S1 and the second control signal S2 are used to reverse the conduction states of the first switch T1 and the second switch T2, and the third control signal S3 and the fourth control signal S4 are used to reverse the conduction states of the third switch T3 and the fourth switch T4. The phase difference between the first control signal S1 and the third control signal S3 is 180 degrees, and the phase difference between the second control signal S2 and the fourth control signal S4 is 180 degrees, thereby making the current through the second winding N2 equal in magnitude and opposite in direction to the current through the third winding N3.

[0040] The method described above for controlling circuit signals by adjusting the duty cycle of switching signals in this invention belongs to the Pulse Width Modulation (PWM) method. It has the advantages of high efficiency, good output waveform, and precise control capability. Compared with the Pulse Frequency Modulation (PFM) method in related technologies, PWM enables the circuit to operate within a wider voltage range, while achieving high voltage gain and full-range soft switching, thereby improving the operating efficiency and reliability of the converter.

[0041] Specifically, Figures 2 to 4 The waveforms of the resonant converter's operating parameters under different duty cycles of the control signals are shown. Taking the adjustment of the duty cycle Ds1 of the first control signal S1 as an example, the duty cycles of other control signals can be obtained according to the above embodiment. Figure 2 For the example where Ds1 < 0.5, Figure 3 For the example where Ds1 > 0.5, Figure 4 This is an example with Ds1=0.5. T0 is one period, and t0, t1, t2, t3, and t4 are different times within one period T0, used to more intuitively represent the phase relationship between each control signal. Vab is... Figure 1 The voltage Vcd between node a and node b in the circuit diagram shown is... Figure 1 The circuit diagram shows the voltage between node c and node d. In1 is the current flowing through the first winding N1, In2 is the current flowing through the second winding N2, and In3 is the current flowing through the third winding N3.

[0042] In some embodiments, the process of calculating the duty cycle signal based on a target gain for the amplitude of the input voltage includes: The rated output voltage Vo of the high-voltage side bridge arm A2 is sampled as the sampling voltage Vh, and then, as... Figure 5 As shown, the difference between the sampled voltage Vh and the reference voltage Vref is input to the proportional-integral controller PI to obtain the duty cycle signal Sd output by the proportional-integral controller PI. The reference voltage Vref is set according to the target gain. The parameters in the proportional-integral controller PI also include the preset maximum duty cycle Dmax and minimum duty cycle Dmin.

[0043] The proportional-integral controller adjusts the output based on the error between the sampled voltage Vh and the reference voltage Vref, and performs closed-loop control of the rated output voltage. This reduces the complexity of the control unit while achieving real-time control of bidirectional power flow.

[0044] In specific implementation, taking the adjustment of the duty cycle Ds1 of the first control signal S1 as an example, after determining the duty cycle Ds1 of the first control signal S1, the input voltage Vi is multiplied to the clamping voltage Vb according to the formula Ds1=Vi / Vb. The relationship between the clamping voltage Vb and the rated output voltage Vo is Vo / Vb=2n×sin(πDs1), where n is the equivalent transformer turns ratio of the three-winding coupled inductor.

[0045] In some embodiments, the above method further includes: The fifth control signal S5, the sixth control signal S6, the seventh control signal S7, and the eighth control signal S8 are provided to the high-voltage side bridge arm A2, wherein, as Figures 2 to 4 As shown, the fifth control signal S5 and the sixth control signal S6 are used to reverse the conduction states of the fifth switch T5 and the sixth switch T6, and the seventh control signal S7 and the eighth control signal S8 are used to reverse the conduction states of the seventh switch T7 and the eighth switch T8. The phase difference between the fifth control signal S5 and the seventh control signal S7 is 180 degrees, and the phase difference between the sixth control signal S6 and the eighth control signal S8 is 180 degrees. The duty cycle of the fifth control signal S5, the sixth control signal S6, the seventh control signal S7, and the eighth control signal S8 is 50%.

[0046] The switching transistors on the same bridge arm of the high-voltage side A2 are complementary and conduct, with a working phase difference of 180° between the two bridge arms. The duty cycle of the switching transistors in the high-voltage side bridge arm A2 is fixed at 50%. At this time, the switching frequency of the converter is fixed and equal to the resonant frequency, thereby realizing soft switching of the high and low voltage side switching transistors under high voltage gain and high voltage output, and reducing circuit switching losses.

[0047] In some embodiments, the phase difference between the low-voltage side control signal (i.e., the first control signal S1, the second control signal S2, the third control signal S3 and the fourth control signal S4) and the high-voltage side control signal (i.e., the fifth control signal S5, the sixth control signal S6, the seventh control signal S7 and the eighth control signal S8) is zero, so as to achieve the shortest zero level of the primary side bridge arm midpoint voltage and reduce switching losses.

[0048] In practice, the high-voltage side control signal maintains a duty cycle of 50%, while the phase difference is set to zero with the center of the low-voltage side control signal pulse width as a reference.

[0049] The control method for the multi-winding coupled inductor resonant converter described in the embodiments of the present invention can decouple the duty cycle control loop and the phase shift control loop, eliminate the need to pre-store control data in a lookup table, achieve real-time control, simplify the control loop, and improve the speed and reliability of the system.

[0050] In practice, the above method can be executed by a control circuit, the topology of which is as follows: Figure 5 As shown, the control circuit includes a sampling circuit, a controller, and a drive circuit. The sampling circuit includes multiple sensors. The controller uses a DSP (Digital Signal Processor) as its core, and is used to calculate, convert, and perform PWM modulation on the sampled voltage and current signals obtained by the sampling circuit according to the phase difference and duty cycle requirements. The drive circuit receives the PWM signal from the controller, and after isolation and voltage / current amplification, provides control signals (S1, S2, S3, S4, S5, S6, S7, S8) and drive voltages to the switching transistors (T1, T2, T3, T4, T5, T6, T7, T8) of the resonant converter.

[0051] It should be noted that the method of this embodiment can be executed by a single device, such as a computer or server. The method of this embodiment can also be applied to a distributed scenario, where multiple devices cooperate to complete the task. In such a distributed scenario, one of these devices may execute only one or more steps of the method of this embodiment, and the multiple devices will interact with each other to complete the above method.

[0052] It should be noted that the above description describes some embodiments of the present invention. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps described in the claims may be performed in a different order than that shown in the above embodiments and still achieve the desired results. Furthermore, the processes depicted in the drawings do not necessarily require a specific or sequential order to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0053] Figure 6 A schematic diagram of the structure of an electronic device provided by an embodiment of the present invention is shown.

[0054] like Figure 6 As shown, the electronic device may include a processor 1101 and a memory 1102 storing computer program instructions.

[0055] Specifically, the processor 1101 may include a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits that can be configured to implement the embodiments of the present invention.

[0056] Memory 1102 may include a mass storage device for information or instructions. For example, and not limitingly, memory 1102 may include a hard disk drive (HDD), floppy disk drive, flash memory, optical disk, magneto-optical disk, magnetic tape, or Universal Serial Bus (USB) drive, or a combination of two or more of these. Where appropriate, memory 1102 may include removable or non-removable (or fixed) media. Where appropriate, memory 1102 may be internal or external to the integrated gateway device. In a particular embodiment, memory 1102 is a non-volatile solid-state memory. In a particular embodiment, memory 1102 includes read-only memory (ROM). Where appropriate, the ROM may be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable programmable PROM (EEPROM), an electrically alterable ROM (EAROM), or flash memory, or a combination of two or more of these.

[0057] The processor 1101 reads and executes computer program instructions stored in the memory 1102 to perform the steps of the control method for the multi-winding coupled inductor resonant converter provided in the embodiments of the present invention.

[0058] In one example, the electronic device may also include a transceiver 1103 and a bus 1104. Wherein, as... Figure 6 As shown, the processor 1101, memory 1102 and transceiver 1103 are connected via bus 1104 and communicate with each other.

[0059] Bus 1104 may include hardware, software, or both. For example, and not limitingly, the bus may include an Accelerated Graphics Port (AGP) or other graphics bus, an Extended Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a Hyper Transport (HT) interconnect, an Industrial Standard Architecture (ISA) bus, an Infinite Bandwidth Interconnect, a Low Pin Count (LPC) bus, a memory bus, a MicroChannel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local Bus (VLB) bus, or other suitable buses, or a combination of two or more of these. Where appropriate, bus 1104 may include one or more buses. Although specific buses are described and illustrated in the embodiments of the present invention, the present invention is contemplated by any suitable bus or interconnect.

[0060] The following are embodiments of a computer-readable storage medium provided in this invention. This computer-readable storage medium and the control method of the multi-winding coupled inductor resonant converter in the above embodiments belong to the same inventive concept. For details not described in detail in the embodiments of the computer-readable storage medium, please refer to the embodiments of the control method of the multi-winding coupled inductor resonant converter described above.

[0061] This embodiment provides a storage medium containing computer-executable instructions, which, when executed by a computer processor, are used to perform a control method for a multi-winding coupled inductor resonant converter.

[0062] Of course, the computer-executable instructions provided in the embodiments of the present invention are not limited to the above-described method operations, but can also execute related operations in the control method of the multi-winding coupled inductor resonant converter provided in any embodiment of the present invention.

[0063] Based on the above description of the implementation methods, those skilled in the art can clearly understand that the present invention can be implemented using software and necessary general-purpose hardware, and of course, it can also be implemented using hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ROM), random access memory (RAM), flash memory, hard disk, or optical disk, etc., including several instructions to cause a computer cloud platform (which can be a personal computer, server, or network cloud platform, etc.) to execute the control method of the multi-winding coupled inductor resonant converter provided in the various embodiments of the present invention.

[0064] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the aforementioned element.

[0065] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments described above, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multi-winding coupled inductor resonant converter, characterized in that, It includes a low-voltage side bridge arm, a high-voltage side bridge arm, and a three-winding coupled inductor, wherein: The three-winding coupled inductor includes a first winding, a second winding, and a third winding. The high-voltage side bridge arm is connected to the first winding, and the low-voltage side bridge arm is connected to the second winding and the third winding. The low-voltage side bridge arm is used to receive the input voltage and the low-voltage side control signal. The low-voltage side bridge arm is used to multiply the amplitude of the input voltage and perform high-frequency inversion on the waveform of the input voltage according to the low-voltage side control signal, and output the resonant voltage to the high-voltage side bridge arm through the three-winding coupling inductor. The high-voltage side bridge arm is used to receive the high-voltage side control signal and the resonant voltage through the three-winding coupling inductor. The high-voltage side bridge arm is used to perform voltage doubler rectification on the waveform of the resonant voltage according to the high-voltage side control signal and output the rated output voltage.

2. The resonant converter as described in claim 1, characterized in that, The low-voltage side bridge arm includes a first switch, a second switch, a third switch, a fourth switch, and a clamping capacitor. The low-voltage side control signals include a first control signal, a second control signal, a third control signal, and a fourth control signal, wherein: The control electrode of the first switch is used to receive the first control signal, the control electrode of the second switch is used to receive the second control signal, the control electrode of the third switch is used to receive the third control signal, and the control electrode of the fourth switch is used to receive the fourth control signal. One end of the second winding is connected to one end of the third winding at the first node; The other end of the second winding is connected to the drain of the second switching transistor and the source of the first switching transistor, and the other end of the third winding is connected to the drain of the fourth switching transistor and the source of the third switching transistor. The drain of the first switching transistor is connected to the drain of the third switching transistor and one end of the clamping capacitor; The source of the second switch transistor, the source of the fourth switch transistor, and the other end of the clamping capacitor are connected to the second node. The first node and the second node are used together to receive the input voltage.

3. The resonant converter as described in claim 1, characterized in that, The high-voltage side bridge arm includes a fifth switch, a sixth switch, a seventh switch, an eighth switch, a resonant capacitor, a first output capacitor, and a second output capacitor. The high-voltage side control signals include a fifth control signal, a sixth control signal, a seventh control signal, and an eighth control signal, wherein: The control electrode of the fifth switch is used to receive the fifth control signal, the control electrode of the sixth switch is used to receive the sixth control signal, the control electrode of the seventh switch is used to receive the seventh control signal, and the control electrode of the eighth switch is used to receive the eighth control signal. One end of the first winding is connected to one end of the resonant capacitor, and the other end of the first winding is connected to the source of the seventh switch and the drain of the eighth switch. The other end of the resonant capacitor is connected to the source of the fifth switch and the drain of the sixth switch. The drain of the fifth switch is connected to one end of the first output capacitor at the third node. The other end of the first output capacitor is connected to one end of the second output capacitor, the source of the sixth switch, and the drain of the seventh switch. The other end of the second output capacitor is connected to the source of the eighth switch at the fourth node. The third node and the fourth node are used together to output the rated output voltage.

4. A control method for a multi-winding coupled inductor resonant converter, characterized in that, The method, applied to the multi-winding coupled inductor resonant converter according to any one of claims 1 to 3, comprises: Using the low-voltage side control signal and the high-voltage side control signal, the current through the second winding is made to be equal in magnitude and opposite in direction to the current through the third winding.

5. The method as described in claim 4, characterized in that, The low-voltage side bridge arm includes a first switch, a second switch, a third switch, a fourth switch, and a clamping capacitor. The low-voltage side control signals include a first control signal, a second control signal, a third control signal, and a fourth control signal, wherein: The control electrode of the first switch is used to receive the first control signal, the control electrode of the second switch is used to receive the second control signal, the control electrode of the third switch is used to receive the third control signal, and the control electrode of the fourth switch is used to receive the fourth control signal. One end of the second winding is connected to one end of the third winding at the first node; The other end of the second winding is connected to the drain of the second switching transistor and the source of the first switching transistor, and the other end of the third winding is connected to the drain of the fourth switching transistor and the source of the third switching transistor. The drain of the first switching transistor is connected to the drain of the third switching transistor and one end of the clamping capacitor; The source of the second switching transistor, the source of the fourth switching transistor, and the other end of the clamping capacitor are connected to the second node. The first node and the second node are used together to receive the input voltage. The method further includes: The duty cycle signal is calculated based on the target gain of the amplitude of the input voltage, wherein the duty cycle signal is used to adjust the duty cycle of the first control signal, the second control signal, the third control signal, and the fourth control signal; Based on the duty cycle signal, the first control signal, the second control signal, the third control signal, and the fourth control signal are provided to the low-voltage side bridge arm. The first control signal and the second control signal are used to reverse the conduction states of the first switch and the second switch, and the third control signal and the fourth control signal are used to reverse the conduction states of the third switch and the fourth switch. The phase difference between the first control signal and the third control signal is 180 degrees, and the phase difference between the second control signal and the fourth control signal is 180 degrees.

6. The method as described in claim 5, characterized in that, The step of calculating the duty cycle signal based on the target gain of the input voltage amplitude includes: The rated output voltage of the high-voltage side bridge arm is sampled as the sampling voltage; The difference between the sampled voltage and the reference voltage is input to the proportional-integral controller to obtain the duty cycle signal output by the proportional-integral controller, wherein the reference voltage is set according to the target gain.

7. The method as described in claim 4, characterized in that, The high-voltage side bridge arm includes a fifth switch, a sixth switch, a seventh switch, an eighth switch, a resonant capacitor, a first output capacitor, and a second output capacitor. The high-voltage side control signals include a fifth control signal, a sixth control signal, a seventh control signal, and an eighth control signal, wherein: The control electrode of the fifth switch is used to receive the fifth control signal, the control electrode of the sixth switch is used to receive the sixth control signal, the control electrode of the seventh switch is used to receive the seventh control signal, and the control electrode of the eighth switch is used to receive the eighth control signal. One end of the first winding is connected to one end of the resonant capacitor, and the other end of the first winding is connected to the source of the seventh switch and the drain of the eighth switch. The other end of the resonant capacitor is connected to the source of the fifth switch and the drain of the sixth switch. The drain of the fifth switch is connected to one end of the first output capacitor at the third node. The other end of the first output capacitor is connected to one end of the second output capacitor, the source of the sixth switch, and the drain of the seventh switch. The other end of the second output capacitor is connected to the source of the eighth switch at the fourth node. The third node and the fourth node are used together to output the rated output voltage. The method further includes: The fifth control signal, the sixth control signal, the seventh control signal, and the eighth control signal are provided to the high-voltage side bridge arm. The fifth control signal and the sixth control signal are used to reverse the conduction states of the fifth switch and the sixth switch, respectively. The seventh control signal and the eighth control signal are used to reverse the conduction states of the seventh switch and the eighth switch, respectively. The phase difference between the fifth control signal and the seventh control signal is 180 degrees, and the phase difference between the sixth control signal and the eighth control signal is 180 degrees. The duty cycle of the fifth control signal, the sixth control signal, the seventh control signal, and the eighth control signal is 50%.

8. The method as described in claim 4, characterized in that, The phase difference between the low-voltage side control signal and the high-voltage side control signal is zero.

9. An electronic device, characterized in that, include: processor; A memory for storing executable instructions; wherein the processor is configured to read the executable instructions from the memory and execute the executable instructions to implement the method of any one of claims 4 to 8.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, The storage medium stores a computer program that, when executed by a processor, causes the processor to implement the method described in any one of claims 4 to 8.

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