Efficient hybrid power supply topology circuit, power supply system and control method thereof

Abstract

The invention discloses a high-efficiency hybrid power supply topology circuit, a power supply system and a control method thereof, the high-efficiency hybrid power supply topology circuit comprises a direct current input module, a hybrid primary side module, a power transformer T1, a synchronous rectification module and a direct current output module, the hybrid primary side module comprises a resonance unit, a flyback unit and a sharing unit, the resonance unit, the flyback unit and the sharing unit are electrically connected to a primary winding of the power transformer T1, the DC input module is connected in parallel with the hybrid primary module, the synchronous rectification module is connected to a secondary winding of the power transformer T1, and the DC output module is connected in parallel with the synchronous rectification module; when the efficient hybrid power supply topology circuit is switched into an LLC resonant mode, the resonant unit and the common unit are turned on, the flyback unit is turned off, and the synchronous rectification module is switched into the LLC resonant mode. When the high-efficiency hybrid power supply topology circuit is switched to an ACF flyback mode, the flyback unit and the common unit are turned on, the resonance unit is turned off, and the synchronous rectification module is switched to the ACF flyback mode.

Description

Technical Field

[0001] The present invention relates to the technical field of power supplies, and in particular to a high-efficiency hybrid power supply topology circuit, a power supply system and a control method thereof. Background Art

[0002] In today's power supply system landscape, the asymmetric half-bridge LLC (LLC) topology (hereafter referred to as the LLC) and the ACF flyback topology are two extremely widely used power supply topologies. With their unique circuit characteristics and operating principles, they play an important role in different power scenarios, providing stable power supply for various electronic devices.

[0003] Taking a power supply rated at 1000W as an example, if it uses an LLC topology, the efficiency can reach over 93% when the power exceeds 300W (i.e., 30% load). Efficiency peaks in the 40% to 70% load range. However, when the power drops below 300W, the efficiency drops below 93%; below 200W, the efficiency may even fall below 80%. If the power supply adopts an ACF flyback topology, the efficiency can reach 93% when the load is below 30%, but it drops above 30%.

[0004] As can be seen, both the LLC and ACF flyback topologies have their optimal efficiency power ranges. Beyond these ranges, their efficiency advantages are significantly diminished. Therefore, in applications requiring extremely high power efficiency or with strict heat dissipation limits, a single circuit topology is insufficient and presents significant limitations. To overcome the limitations of a single topology, one possible solution is to combine the LLC and ACF flyback topologies. However, simply combining them to form two separate topologies and operating them separately introduces new challenges. Firstly, the addition of additional circuit components and wiring increases the size of the power supply. Secondly, switching between the two topologies requires precise control and complex logic, which not only increases the difficulty and cost of circuit design but also potentially impacts the stability and reliability of the power supply. Switching between the two topologies can lead to uneven power, voltage, and current transitions. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, a high-efficiency hybrid power topology circuit, a power system and a control method thereof are provided.

[0006] To achieve the above objectives, the present invention provides a high-efficiency hybrid power supply topology circuit, including a DC input module, a hybrid primary module, a power transformer T1, a synchronous rectifier module and a DC output module. The hybrid primary module includes a resonant unit, a flyback unit and a common unit. The resonant unit, the flyback unit and the common unit are electrically connected to the primary winding of the power transformer T1. The DC input module is connected in parallel with the hybrid primary module. The synchronous rectifier module is connected to the secondary winding of the power transformer T1. The DC output module is connected in parallel with the synchronous rectifier module. When the high-efficiency hybrid power supply topology circuit switches to the LLC resonant mode, the resonant unit and the common unit are turned on, the flyback unit is turned off, and the synchronous rectifier module switches to the LLC resonant mode. When the high-efficiency hybrid power supply topology circuit switches to the ACF flyback mode, the flyback unit and the common unit are turned on, the resonant unit is turned off, and the synchronous rectifier module switches to the ACF flyback mode.

[0007] According to one embodiment of the present invention, the resonant unit includes MOS transistors Q1, Q2, Q5, and an inductor L1; the flyback unit includes MOS transistors Q3, Q4, Q6, and Q7; the shared unit includes MOS transistor Q8 and capacitor C2; the source of MOS transistor Q2 is respectively connected to the primary winding of the power transformer T1 and the drain of MOS transistor Q8; the drain of MOS transistor Q2 is connected to the drain of MOS transistor Q1; the source of MOS transistor Q1 is connected to one end of the DC input module; one end of the inductor L1 is ... The other end of the inductor L1 is connected to the source of the MOS transistor Q5. The drain of the MOS transistor Q5 is connected to one end of the capacitor C2 and the source of the MOS transistor Q6. The other end of the capacitor C2 is connected to the primary winding of the power transformer T1 and the source of the MOS transistor Q4. The drain of the MOS transistor Q4 is connected to the drain of the MOS transistor Q3. The source of the MOS transistor Q3 is connected to the source of the MOS transistor Q1 and one end of the DC input module. The drain of the MOS transistor Q7 is connected to the drain of the MOS transistor Q4. The drain of Q6 is connected, and the source of MOS tube Q7 is connected to the source of MOS tube Q2, the primary winding of power transformer T1 and the drain of MOS tube Q8 respectively; the synchronous rectifier module is connected to the secondary winding of power transformer T1, and the DC output module is connected in parallel to the output end of the synchronous rectifier module; when the high-efficiency hybrid power topology circuit switches to LLC resonant mode, MOS tube Q8 is disconnected first, and then MOS tube Q3 and MOS tube Q4 are disconnected. After disconnecting MOS tube Q3 and MOS tube Q4, MOS tube Q1 and MOS tube Q4 are closed according to the preset time delay. When the high-efficiency hybrid power supply topology circuit switches to the ACF flyback mode, the MOS tube Q8 is disconnected first, and then the MOS tube Q6 is closed with a delay according to the preset time. Then, the MOS tube Q1 and the MOS tube Q5 are disconnected. After the MOS tube Q1 and the MOS tube Q5 are disconnected, the MOS tube Q3, the MOS tube Q4 and the MOS tube Q7 are closed with a delay according to the preset time. Finally, the MOS tube Q8 is closed.

[0008] According to one embodiment of the present invention, a synchronous rectification module includes a MOS transistor Q9, a MOS transistor Q10, and a MOS transistor Q11. The source of the MOS transistor Q9 is connected to the secondary winding of the power transformer T1, the drain of the MOS transistor Q9 is connected to the drain of the MOS transistor Q10, and the source of the MOS transistor Q10 is respectively connected to the drain of the MOS transistor Q11 and one end of the DC output module. The source of the MOS transistor Q11 is connected to the secondary winding of the power transformer T1, and the other end of the DC output module and the secondary winding of the power transformer T1 are commonly grounded. When the high-voltage synchronous rectification module switches to LLC resonant mode, the MOS transistors Q9 and Q10 are turned on, and the MOS transistor Q11 is turned off. When the synchronous rectification module switches to ACF flyback mode, the MOS transistors Q9 and Q10 are turned off, and the MOS transistor Q11 is turned on.

[0009] According to one embodiment of the present invention, the DC input module includes a capacitor C1, which is connected in parallel to the input end of the hybrid primary module. The DC output module includes a capacitor C3 and a load R, which is connected in parallel to the output end of the synchronous rectification module. The load R is connected in parallel to the capacitor C3.

[0010] The present invention also provides a power supply system, including the above-mentioned high-efficiency hybrid topology circuit, and also including: a sampling module, the sampling module is electrically connected to the high-efficiency hybrid power topology circuit, and is used to collect the current signal and / or voltage signal of the high-efficiency hybrid power topology circuit, and output the collected current signal and / or voltage signal; a control module, which is electrically connected to the sampling module, the control module receives the current signal and / or voltage signal sent by the sampling module, and calculates the power supply power according to the current signal and / or voltage signal, and generates a driving signal according to the power supply power, and then the control module outputs the driving signal; a driving module, which is respectively connected to the high-efficiency hybrid power topology circuit and the control module, the driving module receives the driving signal output by the control module 6, and drives the high-efficiency hybrid power topology circuit to switch to LLC resonant mode or ACF flyback mode according to the driving signal.

[0011] According to one embodiment of the present invention, the sampling module includes a current sampling group and / or a voltage sampling group, the current sampling group includes an input current sampling unit and / or an output current sampling unit, and the voltage sampling group includes an input voltage sampling unit and / or an output voltage sampling unit; one end of the input current sampling unit is respectively connected to the DC input module and the ground end, and the other end is connected to the hybrid primary module; the input voltage sampling unit is connected in parallel to the two ends of the DC input module; one end of the output current sampling unit is connected to the DC output module; and the output voltage sampling unit is connected in parallel to the two ends of the DC output module.

[0012] According to one embodiment of the present invention, an isolation module is further included, and the isolation module includes a first isolation unit and a second isolation unit. One end of the first isolation unit is connected to the sampling module, and the other end thereof is connected to the control module; one end of the second isolation unit is connected to the control module, and the other end thereof is connected to the driving module.

[0013] The present invention also provides a control method for a power supply system, which is applied to the above-mentioned power supply system, and includes the following steps: S1, preset conversion power; S2, a sampling module collects current signals and / or voltage signals of a high-efficiency hybrid power supply topology circuit, and sends the current signals and / or voltage signals to a control module; S3, a control module receives the current signals and / or voltage signals sent by the sampling module, and calculates the power supply power based on the current signals and / or voltage signals. When the power supply power is greater than the preset conversion power, the control module outputs an LLC control signal; when the power supply power is less than the preset conversion power, the control module outputs an ACF control signal; S4, when the driving module receives the LLC control signal, the driving module controls the resonant unit and the common unit to close according to the control signal, the flyback unit to disconnect, and the synchronous rectifier module to switch to the LLC resonant mode; when the driving module receives the ACF control signal, the driving module controls the flyback unit and the common unit to close according to the control signal, the resonant unit to disconnect, and the synchronous rectifier module to switch to the ACF flyback mode.

[0014] The beneficial effect of the present invention is that by controlling the switching states of the resonant unit, the flyback unit and the common unit, the working mode of the high-efficiency hybrid power supply topology circuit is switched to meet the requirements of high efficiency and wide range, and there is no need to set up two topologies separately, which effectively simplifies the circuit structure of the switching power supply and reduces the volume of the switching power supply. In addition, when the working mode of the high-efficiency hybrid power supply topology circuit is switched, the power, voltage and current of the circuit are smoothly connected. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings: Figure 1 A high-efficiency hybrid power supply topology circuit diagram in an embodiment; Figure 2 Schematic diagram of a circuit in which the high-efficiency hybrid power supply topology circuit in the embodiment is in LLC resonant mode; Figure 3 Schematic diagram of a circuit in which the high-efficiency hybrid power supply topology circuit in the embodiment is in ACF flyback mode; Figure 4 Schematic diagram of the current before the high-efficiency hybrid power topology circuit in the embodiment switches to the LLC resonant mode; Figure 5Schematic diagram of the current before the high-efficiency hybrid power topology circuit in the embodiment switches to the ACF flyback mode; Figure 6 is a circuit block diagram of a power supply system in an embodiment.

[0016] Description of Reference Numerals 1. DC input module; 2. Hybrid primary module; 21. Resonant unit; 22. Flyback unit; 23. Common unit; 3. Synchronous rectification module; 4. DC output module; 5. Sampling module; 51. Current sampling group; 511. Input current sampling unit; 512. Output current sampling unit; 52. Voltage sampling group; 521. Input voltage sampling unit; 522. Output voltage sampling unit; 6. Control module; 7. Drive module; 8. Isolation module; 81. First isolation unit; 82. Second isolation unit. DETAILED DESCRIPTION

[0017] The following diagrams illustrate various embodiments of the present invention. For clarity, many practical details are included in the following description. However, it should be understood that these practical details are not intended to limit the present invention. In other words, in some embodiments of the present invention, these practical details are not essential. Furthermore, to simplify the drawings, some commonly used structures and components are depicted in simplified schematic form.

[0018] In addition, in the present invention, descriptions such as "first" and "second" are only used for descriptive purposes and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0019] Example 1 Please refer to Figure 1 , Figure 1This is a high-efficiency hybrid power supply topology circuit diagram. This embodiment provides a high-efficiency hybrid power supply topology circuit, which includes a DC input module 1, a hybrid primary module 2, a power transformer T1, a synchronous rectifier module 3, and a DC output module 4. Among them, the hybrid primary module 2 is connected to the primary winding of the power transformer T1, and the DC input module 1 is connected in parallel with the hybrid primary module 2. The hybrid primary module 2 includes a resonant unit 21, a flyback unit 22, and a common unit 23. The synchronous rectifier module 3 is connected to the secondary winding of the power transformer T1, and the DC output module 4 is connected in parallel with the synchronous rectifier module 3. The high-efficiency hybrid power supply topology circuit can be switched to LLC resonant mode or ACF flyback mode according to actual usage requirements.

[0020] Specifically, when the high-efficiency hybrid power topology circuit switches to LLC resonant mode, the resonant unit 21 and the shared unit 23 are turned on, the flyback unit 22 is turned off, and the synchronous rectifier module 3 switches to LLC resonant mode. The DC input module 1 provides DC power, the resonant unit 21 and the shared unit 23 receive the DC power output by the DC input module 1, and resonate the DC power output by the DC input module 1. The primary winding of the power transformer T1 receives the voltage output by the resonant unit 21 and the shared unit 23, and transforms the voltage output by the resonant unit 21 and the shared unit 23. The synchronous rectifier module 3 receives the voltage output by the secondary winding of the power transformer T1, rectifies the voltage output by the secondary winding of the power transformer T1, and then outputs it. The DC output module 4 receives the voltage output by the synchronous rectifier module 3.

[0021] When the high-efficiency hybrid power supply topology circuit switches to ACF flyback mode, the flyback unit 22 and the common unit 23 are turned on, the resonant unit 21 is turned off, and the synchronous rectifier module 3 switches to ACF flyback mode. The DC input module 1 provides DC power, the flyback unit 22 and the common unit 23 receive and process the DC power output by the DC input module 1, the primary winding of the power transformer T1 receives and transforms the voltage output by the flyback unit 22 and the common unit 23, the synchronous rectifier module 3 receives the voltage output by the secondary winding of the power transformer T1, and rectifies and outputs the voltage output by the secondary winding of the power transformer T1, and the DC output module 4 receives the voltage output by the synchronous rectifier module 3.

[0022] In this way, by integrating the LLC topology circuit and the ACF flyback circuit into one, and by controlling the switching states of the resonant unit 21, the flyback unit 22 and the common unit 23, the working mode of the high-efficiency hybrid power topology circuit is switched to meet the requirements of high efficiency and wide range, and there is no need to set up two topologies separately, which effectively simplifies the circuit structure of the switching power supply and reduces the size of the switching power supply.

[0023] Specifically, the resonant unit 21 includes MOS transistors Q1, Q2, Q5, and an inductor L1. The flyback unit 22 includes MOS transistors Q3, Q4, Q6, and Q7. The shared unit 23 includes MOS transistor Q8 and capacitor C2. The source of MOS transistor Q2 is connected to the primary winding of power transformer T1 and the drain of MOS transistor Q8, respectively. The drain of MOS transistor Q2 is connected to the drain of MOS transistor Q1. The source of MOS transistor Q1 is connected to one end of the DC input module 1. One end of inductor L1 is connected to the source of MOS transistor Q8, the other end of DC input module 1, and ground, respectively. The other end of inductor L1 is connected to the source of MOS transistor Q5. The drain of MOS transistor Q5 is connected to one end of capacitor C2 and the source of MOS transistor Q6, respectively. The other end of capacitor C2 is connected to the primary winding of power transformer T1 and the source of MOS transistor Q4, respectively. The drain of MOS transistor Q4 is connected to the drain of MOS transistor Q3. The source of MOS transistor Q3 is connected to the source of MOS transistor Q1 and one end of DC input module 1. The drain of MOS transistor Q7 is connected to the drain of MOS transistor Q6. The source of MOS transistor Q7 is connected to the source of MOS transistor Q2, the primary winding of power transformer T1, and the drain of MOS transistor Q8. Synchronous rectifier module 3 is connected to the secondary winding of power transformer T1. DC output module 4 is connected in parallel with synchronous rectifier module 3.

[0024] In actual application scenarios, the operating mode of the hybrid primary module 2 is switched by switching the on / off states of MOS transistors Q1, Q2, Q3, Q4, Q5, Q6, Q7, and Q8. Specifically, when the high-efficiency hybrid power topology circuit is switched to the LLC resonant mode, MOS transistor Q8 is first disconnected. After disconnecting MOS transistor Q8, MOS transistor Q3 and MOS transistor Q4 are disconnected. Then, MOS transistors Q1 and Q5 are closed with a preset time delay. After closing MOS transistors Q1 and Q5, MOS transistors Q6 and Q7 are disconnected with a preset time delay. Finally, MOS transistor Q2 is closed. When the high-efficiency hybrid power supply topology circuit is switched to the ACF flyback mode, the MOS transistor Q8 is first disconnected. After the MOS transistor Q8 is disconnected, the MOS transistor Q6 is closed with a delay according to a preset time. Then, the MOS transistors Q1 and Q5 are disconnected. After the MOS transistors Q1 and Q5 are disconnected, the MOS transistors Q3, Q4, and Q7 are closed with a delay according to a preset time. Finally, the MOS transistor Q8 is closed. In this way, the high-efficiency hybrid power supply topology circuit is switched to the ACF flyback mode.

[0025] It should be noted that the preset time is based on the time it takes for the MOS transistor to activate the Miller platform. This time varies depending on the device and circuit drive capabilities. In this example, the preset time is set to 50ns. This ensures that when the MOS transistor takes action, the MOS transistor in the previous step is already in the stable range, ensuring that the circuit does not short-circuit.

[0026] Please refer to Figure 2 , Figure 2 This is a circuit diagram of a high-efficiency hybrid power supply topology circuit in LLC resonant mode. In LLC resonant mode, the resonant unit 21 and common unit 23 of the hybrid primary module 2 are turned on. MOS transistor Q8 serves as the resonant lower transistor in LLC resonant mode, Q2 serves as the resonant upper transistor in LLC resonant mode, capacitor C2 serves as the resonant capacitor in LLC resonant mode, and inductor L1 serves as the resonant supplementary inductor in LLC resonant mode. MOS transistors Q1 and Q5 are normally closed, low-resistance MOSFETs in LLC resonant mode. That is, when no gate voltage is applied, MOS transistors Q1 and Q5 are on by default. MOS transistor Q1 is used to prevent MOS transistor Q2 from mis-turning on in ACF flyback mode. MOS transistors Q1 and Q2 are mirrored, so that the internal diode of MOS transistor Q1 and the internal diode of MOS transistor Q2 are in opposite directions. MOS transistor Q1 is used to prevent MOS transistor Q2 from turning on in ACF flyback mode due to reverse current flow. The MOS transistor Q5 is used for branch selection. By setting the MOS transistor Q5, it is convenient for current to flow through the MOS transistor Q5 and toward the inductor L1.

[0027] Please refer to Figure 3 , Figure 3This is a circuit diagram of a high-efficiency hybrid power supply topology in ACF flyback mode. In ACF flyback mode, flyback unit 22 and common unit 23 of hybrid primary module 2 are enabled. MOS transistor Q8 serves as the main flyback power MOS transistor in ACF flyback mode, and MOS transistor Q7 serves as the clamping MOS transistor in ACF flyback mode. Capacitor C2 serves as the clamping capacitor in ACF flyback mode. MOS transistors Q3, Q4, and Q6 are normally closed, low-resistance MOSFETs. MOS transistors Q3 and Q4 are mirrored to prevent them from being misdirected by reverse current during LLC resonant mode. MOS transistor Q6 is used to prevent MOS transistor Q7 from being mis-turned on. In the LLC resonant mode, current flows in both forward and reverse directions under the action of resonance, and MOS transistor Q7 may be mis-turned on by the reverse current. Therefore, MOS transistor Q6 and MOS transistor Q7 are connected in series, and MOS transistor Q6 and MOS transistor Q7 are mirror-imaged so that the internal diode of MOS transistor Q6 is opposite to the internal diode of MOS transistor Q7. This prevents current from flowing through MOS transistor Q7 and MOS transistor Q6 when the high-efficiency hybrid power topology circuit is in the LLC resonant mode.

[0028] When the high-efficiency hybrid power topology circuit is in LLC resonant mode or ACF flyback mode, the shared unit 23 is used in the hybrid primary module 2. Since the MOS transistor Q8 is a shared component in the LLC resonant mode and the ACF flyback mode, and the current flow direction of the MOS transistor Q8 is consistent in the LLC resonant mode and the ACF flyback mode, by using the MOS transistor Q8 as the switching point between the LLC resonant mode and the ACF flyback mode, the high-efficiency hybrid power topology circuit is prevented from experiencing sudden current changes when switching modes, achieving smooth switching and ensuring the continuity of current and voltage during switching. Furthermore, by sharing the capacitor C2, the power transformer T1, and the MOS transistor Q8, the ACF flyback topology and the LLC half-bridge resonant topology are integrated into one, meeting the requirements of high efficiency and wide range, without having to set up two topologies separately, effectively simplifying the circuit structure of the switching power supply and reducing the size of the switching power supply.

[0029] Please refer to Figure 4 , Figure 4This is a current diagram of the high-efficiency hybrid power topology circuit before switching to LLC resonant mode. The specific switching process is as follows: When switching the high-efficiency hybrid power topology circuit to LLC resonant mode, MOS transistor Q8 is controlled to be disconnected, followed by MOS transistors Q3 and Q4. After a delay of 50ns, MOS transistors Q1 and Q5 are closed, and after another delay of 50ns, MOS transistors Q6 and Q7 are disconnected. Thus, 100ns after Q8 is disconnected, the current path in the primary circuit of power transformer T1 is as follows: the current originates from the primary winding of power transformer T1, flows to the diode inside MOS transistor Q2, then flows through MOS transistor Q1, DC output module 4, inductor L1, MOS transistor Q5, and capacitor C2, before returning to the primary winding of power transformer T1. At the same time, since MOS transistor Q2 is disconnected in ACF flyback mode, a voltage exists on the parasitic capacitance within MOS transistor Q2, and the voltage is positive at the top and negative at the bottom. When the current direction changes to power transformer T1, MOS transistor Q2, MOS transistor Q1, DC output module 4, inductor L1, MOS transistor Q5, and capacitor C2, the voltage stored in the parasitic capacitance of MOS transistor Q2 is in the same direction as the current. This voltage is released along with the current, discharging the parasitic capacitance of MOS transistor Q2, causing the voltage between the source and drain of MOS transistor Q2 to clamp to zero, preparing for the zero-voltage turn-on of MOS transistor Q2. This prevents MOS transistor Q2 from being immediately subjected to voltage stress upon turn-on, thereby reducing switching losses. MOS transistor Q8 closes 300ns after being disconnected. At this point, the primary winding of the high-efficiency hybrid power topology circuit enters LLC operating mode. In LLC operating mode, MOS transistor Q2 serves as the resonant upper transistor, MOS transistor Q8 as the resonant lower transistor, capacitor C2 as the resonant capacitor, and inductor L1 as the resonant supplementary inductor. Thus, after MOS transistor Q8 closes, the primary winding of the high-efficiency hybrid power topology circuit fully switches to LLC resonant mode.

[0030] It should be noted that when the MOS transistor Q8 is just disconnected, the high-efficiency hybrid power topology circuit has not yet completely switched to the LLC resonant mode. At this time, the circuit flow direction is still the flow direction of the ACF flyback mode, that is, there are two current branches in the primary winding of the high-efficiency hybrid power topology circuit. One current branch is: power transformer T1, MOS transistor Q7, MOS transistor Q6 and capacitor C2, and the other current branch is: power transformer T1, MOS transistor Q8, DC input module 1, MOS transistor Q3 and MOS transistor Q4.

[0031] After MOS transistor Q8 is disconnected, MOS transistors Q3 and Q4 are disconnected. After a 50ns delay, MOS transistors Q1 and Q5 are closed. Because MOS transistors Q3 and Q4 require a certain amount of time to disconnect, if MOS transistor Q1 is already closed or partially closed before MOS transistors Q3 and Q4 are fully disconnected, MOS transistors Q4, Q3, and Q1 are in the on state. At this point, the upper end of capacitor C2 is at the same potential as the upper end of Q2, and the lower end of MOS transistor Q7 is at the same potential as the lower end of MOS transistor Q2. Furthermore, the current direction meets the conduction direction of the parasitic diode within MOS transistor Q2, causing the diode within MOS transistor Q2 to conduct. The current that would have otherwise flowed through capacitor C2 flows entirely through the parasitic diode within MOS transistor Q2, causing the parasitic diode within MOS transistor Q2 to forcibly clamp capacitor C2, MOS transistors Q6, and MOS transistor Q7, resulting in a near-short-circuit state for capacitor C2, MOS transistors Q6, and MOS transistor Q7.

[0032] Furthermore, when MOS transistor Q8 is turned off, the voltage across it is zero. During the 50ns delay, the power transformer T1, MOS transistor Q8, DC input module 1, MOS transistor Q3, and this branch of MOS transistor Q4 charge the parasitic diode within MOS transistor Q8, causing the voltage of MOS transistor Q8 to rise and the potential of MOS transistor Q2 to gradually decrease, preparing for the zero-voltage turn-on before MOS transistor Q2 closes.

[0033] Therefore, after disconnecting MOS transistors Q3 and Q4, a delay of 50ns is performed to ensure that MOS transistors Q3 and Q4 are completely disconnected before closing MOS transistors Q1 and Q5 to prevent components in the circuit from being short-circuited and to ensure that the potential in MOS transistor Q2 is reset to zero.

[0034] Furthermore, a 50ns delay is required after closing MOS transistors Q1 and Q5 to ensure that Q1 and Q5 are fully closed before disconnecting MOS transistors Q6 and Q7. If MOS transistors Q1 and Q5 are not fully closed before MOS transistors Q6 and Q7 are fully disconnected, the primary winding of power transformer T1 will charge the parasitic capacitance within MOS transistor Q6. However, since the parasitic capacitance within MOS transistor Q6 is very small, it will quickly become fully charged. At this point, some current cannot be discharged from power transformer T1, and the current must be further charged to MOS transistors Q1 and Q5, causing MOS transistors Q1 and Q5 to remain closed while charged, increasing circuit losses. Furthermore, if MOS transistors Q1 and Q5 are fully charged but not yet closed, MOS transistors Q3, Q4, Q6, and Q7 in the circuit loop will be fully disconnected, but current will still flow through the primary winding of power transformer T1. This current cannot be discharged, resulting in a very high voltage across power transformer T1, which can damage components within the circuit.

[0035] Please refer to Figure 5 , Figure 5This is a current diagram before the high-efficiency hybrid power supply topology switches to ACF flyback mode. When switching to ACF flyback mode, MOS transistor Q8 is controlled to be off, followed by a 50ns delay. MOS transistor Q6 is then closed, and MOS transistors Q1 and Q5 are disconnected. MOS transistors Q3, Q4, and Q7 are then closed after a 50ns delay. Because the high-efficiency hybrid power supply topology has not yet fully switched to ACF mode after MOS transistor Q8 is disconnected, the current in the high-efficiency hybrid power supply topology still flows in LLC resonant mode. The current flows through the primary winding of power transformer T1, MOS transistor Q8, inductor L1, MOS transistor Q5, capacitor C2, and then back to the primary winding of T1. At this point, a 50ns delay allows the internal diode of MOS transistor Q8 to charge. After MOS transistor Q6 is closed, that is, 100 nanoseconds after MOS transistor Q8 is disconnected, the diode in MOS transistor Q7 is turned on, and the current flows in two directions. 100 nanoseconds after MOS transistor Q8 is disconnected, the current path splits into two parts. One part starts from the primary winding of power transformer T1, passes through the diode in MOS transistor Q7, MOS transistor Q6, capacitor C2, and then returns to power transformer T1. At the same time, because the current flow direction is the same as the voltage direction of the parasitic capacitance in MOS transistor Q7, the parasitic capacitance in MOS transistor Q7 in the current loop discharges, preparing for the zero-voltage soft-start before MOS transistor Q7 is closed. The other part is that the current stored in inductor L1 is released, passes through the diode in MOS transistor Q5, and then flows through capacitor C2, MOS transistors Q4, MOS transistor Q3, and DC input module 1, and then returns to inductor L1. 300 nanoseconds after MOS transistor Q8 is disconnected, MOS transistor Q8 is closed, and the high-efficiency hybrid power supply topology circuit fully switches to ACF flyback mode.

[0036] After disconnecting MOS transistors Q1 and Q5, a delay of 50ns is applied to ensure that Q1 is completely disconnected before closing MOS transistors Q3 and Q4. If MOS transistor Q1 is not completely disconnected and MOS transistors Q3 and Q4 are closed, MOS transistor Q1 will be short-circuited by the internal diode of MOS transistor Q2.

[0037] Please refer to Figure 1 Furthermore, the DC input module 1 includes a capacitor C1, which is connected in parallel to the input end of the hybrid primary module 2. In actual application scenarios, DC power is input to both ends of capacitor C1. Capacitor C1 is used to store energy. When the input DC power is unstable, capacitor C1 discharges to maintain stable current input. The DC output module 4 includes a capacitor C3 and a load R. Capacitor C3 is connected in parallel to the output end of the synchronous rectifier module 3. Capacitor C3 is used to filter and shape the output voltage of the synchronous rectifier module 3 to improve the smoothness and stability of the output voltage. Load R is used to equal the resulting resistance of the output of the synchronous rectifier module 3.

[0038] Please refer to Figure 2 and Figure 3 Furthermore, the synchronous rectification module 3 includes MOS transistors Q9, Q10, and Q11. The source of MOS transistor Q9 is connected to the secondary winding of power transformer T1. The drain of MOS transistor Q9 is connected to the drain of MOS transistor Q10. The source of MOS transistor Q10 is connected to the drain of MOS transistor Q11 and one end of the DC output module 4. The other end of the DC output module 4 is connected to the secondary winding of power transformer T1. The source of MOS transistor Q11 is connected to the secondary winding of power transformer T1.

[0039] When the high-efficiency hybrid power topology circuit is in LLC resonant mode, MOS transistors Q9 and Q11 are turned on, and MOS transistor Q10 is closed. During operation, by controlling the on and off states of MOS transistors Q9 and Q11, current flows through the channels of MOS transistors Q9 and Q11, rather than through the diodes within them. This reduces conduction losses and improves efficiency. The control methods for MOS transistors Q9 and Q11 are similar to those of the prior art and are not detailed here.

[0040] When the high-efficiency hybrid power supply topology circuit is in ACF flyback mode, MOS transistors Q9 and Q10 are disconnected, and MOS transistor Q11 is closed. In ACF flyback mode, the secondary-side rectification is controlled by controlling the on / off state of MOS transistor Q11. The on / off method of MOS transistor Q11 is the same as in the prior art and will not be described in detail here. MOS transistor Q10 is used to prevent MOS transistor Q9 from being mis-conducted. MOS transistor Q9 and MOS transistor Q10 are mirrored, so that the internal diodes of MOS transistors Q9 and Q10 are in opposite directions. This prevents current from flowing through MOS transistor Q9 and MOS transistor Q10 when they are closed, potentially causing mis-conduction of either MOS transistor Q9 or MOS transistor Q10.

[0041] Example 2 Please refer to Figure 6 , Figure 6 : is a circuit block diagram of a power supply system. This embodiment provides a power supply system, which includes the high-efficiency hybrid power supply topology circuit in Example 1, and also includes a sampling module 5, a control module 6 and a driving module 7. Among them, the sampling module 5 is electrically connected to the high-efficiency hybrid power supply topology circuit, and is used to collect the voltage signal and / or current signal of the high-efficiency hybrid power supply topology circuit. The control module 6 is electrically connected to the sampling module 5, and the control module 6 is used to receive the voltage signal and / or current signal collected by the sampling module 5, and calculate the power supply power according to the voltage signal and / or current signal, and then generate a driving signal according to the power supply power. The driving module 7 is connected to the high-efficiency hybrid power supply topology circuit and the control module 6 respectively, and the driving module 7 is used to receive the driving signal and drive the high-efficiency hybrid power supply topology circuit to switch the working mode according to the driving signal.

[0042] It should be noted that the voltage signal includes an input voltage signal and / or an output voltage signal, and the current signal includes an input current signal and / or an output current signal. During use, the control module 6 can calculate the power supply power based on the combination of the input voltage signal + output current signal / output voltage signal + output current signal / input voltage signal + input current signal / input voltage signal + output current signal. Moreover, when the power supply system is a constant current source input, the control module 6 only needs to use the output voltage signal to calculate the power supply power; when the power supply system is a constant current source output, the control module 6 only needs to use the input voltage signal to calculate the power supply power; when the power supply system is a constant voltage input, the control module 6 only needs to use the output current signal to calculate the power supply power; when the power supply system is a constant voltage output, the control module 6 only needs to use the input current signal to calculate the power supply power. Therefore, in actual use, the current signal and / or voltage signal can be sampled according to the actual use scenario.

[0043] In this example, the control module 6 uses an MCU control chip, and the driver module 7 uses a MOS transistor driver chip. The MCU control chip is used to receive the voltage and current signals collected by the sampling module 5, calculate the current power supply power, and output a control signal to the MOS transistor driver chip based on the power supply power. The MOS transistor driver chip controls the switching states of MOS transistors Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, Q10, and Q11 based on the control signal, thereby switching the operating mode of the high-efficiency hybrid power topology circuit. In another embodiment, the control module 6 can use an ARM / DSP control chip, and the driver module 7 can use a drive circuit, a drive transformer, etc. to drive the switching of the MOS transistors.

[0044] The sampling module 5 includes a current sampling group 51 and / or a voltage sampling group 52, wherein the current sampling group 51 includes an input current sampling unit 511 and / or an output current sampling unit 512, and the voltage sampling group 52 includes an input voltage sampling unit 521 and / or an output voltage sampling unit 522. The input current sampling unit 511 is used to collect the input current signal of the high-efficiency hybrid power topology circuit, the input voltage sampling unit 521 is used to collect the input voltage signal of the high-efficiency hybrid power topology circuit, the output current sampling unit 512 is used to collect the output current signal of the high-efficiency hybrid power topology circuit, and the output voltage sampling unit 522 is used to collect the output voltage signal of the high-efficiency hybrid power topology circuit.

[0045] When the sampling module 5 includes an input current sampling unit 511 and an input voltage sampling unit 521, the input current sampling unit 511 collects the input current signal of the high-efficiency hybrid power topology circuit and sends it to the control module 6, and the input voltage sampling unit 521 collects the input voltage signal of the high-efficiency hybrid power topology circuit and sends it to the control module 6. The control module 6 receives the input current signal and the input voltage signal and calculates the power supply power based on the input current signal and the input voltage signal.

[0046] When the sampling module 5 includes an input current sampling unit 511 and an output voltage sampling unit 522, the input current sampling unit 511 collects the input current signal of the high-efficiency hybrid power topology circuit and sends it to the control module 6, and outputs the current signal and sends it to the control module 6. The control module 6 receives the input current signal and the output voltage signal, and calculates the power supply power based on the input current signal and the output voltage signal.

[0047] When the sampling module 5 includes an output current sampling unit 512 and an input voltage sampling unit 521, the output current sampling unit 512 collects the output current signal of the high-efficiency hybrid power topology circuit and sends it to the control module 6, and the input voltage sampling unit 521 collects the input voltage signal of the high-efficiency hybrid power topology circuit and sends it to the control module 6. The control module 6 receives the output current signal and the input voltage signal and calculates the power supply power based on the output current signal and the input voltage signal.

[0048] When the sampling module 5 includes an output current sampling unit 512 and an output voltage sampling unit 522, the output current sampling unit 512 collects the current signal output by the high-efficiency hybrid power topology circuit and sends it to the control module 6, and outputs the current signal and sends it to the control module 6. The control module 6 receives the output current signal and the output voltage signal, and calculates the power supply power based on the output current signal and the output voltage signal.

[0049] When the power supply system uses a constant current source input, sampling unit 5 includes an output voltage sampling unit 522. Output voltage sampling unit 522 collects the output voltage signal of the high-efficiency hybrid power topology circuit and sends it to control module 6. Control module 6 calculates the power supply power based on the input constant current value and the output voltage signal.

[0050] When the power supply system outputs a constant current, the sampling unit 5 includes an input sampling unit 521. The input voltage sampling unit 521 collects the input voltage signal of the high-efficiency hybrid power topology circuit and sends it to the control module 6. The control module 6 calculates the power supply power based on the output constant current value and the input voltage signal.

[0051] When the power supply system is in constant voltage input mode, sampling unit 5 includes output current sampling unit 512. Output current sampling unit 512 collects the output current signal of the high-efficiency hybrid power topology circuit and sends it to control module 6. Control module 6 calculates the power supply power based on the input constant voltage value and the output current signal.

[0052] When the power supply system is in constant voltage output mode, sampling unit 5 includes input current sampling unit 511. Input current sampling unit 511 collects the input current signal of the high-efficiency hybrid power topology circuit and sends it to control module 6. Control module 6 calculates the power supply power based on the output constant voltage value and the input current signal.

[0053] In addition, when the acquisition module 5 includes an input current sampling unit 511, an output current sampling unit 512, an input voltage sampling unit 521, and an output voltage sampling unit 522. The input current sampling unit 511 acquires the input current signal of the high-efficiency hybrid power topology circuit, the input voltage sampling unit 521 acquires the input voltage signal of the high-efficiency hybrid power topology circuit, the output current sampling unit 512 acquires the output current signal of the high-efficiency hybrid power topology circuit, and the output voltage sampling unit 522 acquires the output voltage signal of the high-efficiency hybrid power topology circuit. The control module 6 receives the input current signal, the input voltage signal, the output current signal, and the output voltage signal, respectively, so that the control module 6 can calculate the power supply power based on the input current signal and the output voltage signal / the output current signal and the input voltage signal / the input voltage signal and the output current signal / the output voltage signal and the input current signal. At the same time, the control module 6 can also calculate the input power of the power supply based on the input current signal and the input voltage signal, and calculate the output power of the power supply based on the output current signal and the output voltage signal.

[0054] Therefore, in actual application scenarios, the input current sampling unit 511 , the output current sampling power supply 512 , the input voltage sampling unit 521 and the output voltage sampling unit 522 may be provided according to actual acquisition requirements.

[0055] In this example, the sampling module 5 includes a current sampling group 51 and a voltage sampling group 52. The current sampling group 51 includes an input current sampling unit 511 and an output current sampling unit 512, and the voltage sampling group 52 includes an input voltage sampling unit 521 and an output voltage sampling unit 522 to meet the needs of different usage scenarios. One end of the input current sampling unit 511 is connected to the input DC module and the ground, and the other end is connected to the inductor L1. The input voltage sampling unit 521 is connected in parallel with the input DC module. One end of the output current sampling unit 512 is connected to the DC output module 4, and the other end is connected to the load R and the ground. The output voltage sampling unit 522 is connected in parallel to both ends of the load R.

[0056] It should be noted that the input current sampling unit 511 and the output current sampling unit 512 can use high-precision resistors (including manganese copper shunts), mutual inductors, Hall sensors, etc., and the input voltage sampling unit 521 and the output voltage sampling unit 522 can use resistor dividers, mutual inductors, linear optocouplers, etc.

[0057] Furthermore, the switching power supply system also includes an isolation module 8. The isolation module 8 includes a first isolation unit 81 and a second isolation unit 82. Among them, one end of the first isolation unit 81 is connected to the acquisition module 5, and the other end thereof is connected to the control module 6. The first isolation unit 81 is used to receive the input current, input voltage, output current and output voltage output by the acquisition module 5, and electrically isolate the input current, input voltage, output current and output voltage, and then send the input current, input voltage, output current and output voltage to the control module 6 to reduce interference. One end of the second isolation unit 82 is connected to the control module 6, and the other end thereof is connected to the drive module 7. The second isolation unit 82 is used to receive the drive signal output by the control module 6, perform signal isolation on the drive signal, and then send the isolated drive signal to the drive module 7.

[0058] Example 3 This embodiment provides a power control method, which includes the following steps: S1, preset conversion power; S2, the sampling module 5 collects the current signal and / or voltage signal of the high-efficiency hybrid power topology circuit, and sends the current signal and / or voltage signal to the control module 6; S3, the control module 6 receives the current signal and / or the voltage signal, and calculates the power supply power according to the current signal and / or the voltage signal; S4. The driving module 7 receives a control signal and switches the high-efficiency hybrid power topology circuit to LLC resonant mode or ACF flyback mode according to the control signal. When the power supply power is greater than the preset conversion power, the control module 6 outputs an LLC control signal. When the driving module 7 receives the LLC control signal, it converts the high-efficiency hybrid power topology circuit to LLC resonant mode according to the LLC control signal. When the driving module 7 switches the high-efficiency hybrid power topology circuit to LLC resonant mode, the resonant unit 21 and the common unit 23 are closed, and the flyback unit 22 is disconnected. When the power supply power is less than the preset conversion power, the control module 6 outputs an ACF control signal. When the driving module 7 receives the ACF control signal, it switches the high-efficiency hybrid power topology circuit to ACF flyback mode according to the ACF control signal. When the driving module 7 switches the high-efficiency hybrid power topology circuit to ACF flyback mode, the flyback unit 22 and the common unit 23 are closed, and the resonant unit 21 is disconnected. For the specific switching steps, please refer to Example 1, which will not be described in detail here.

[0059] Since ACF flyback circuits are typically designed for power supplies below 300W, in a power supply rated at 300W, the efficiency of the ACF flyback circuit can reach over 93% at a load range of 20%-100% (i.e., 60W-300W). Half-bridge LLC circuits are typically used in power supplies between 200W and 2000W. When the power is below 300W, the efficiency decreases. In a power supply rated at 1000W, the efficiency of the half-bridge LLC circuit can reach over 93% at a load range of 30%-100% (i.e., 300W-1000W). Therefore, it is recommended to set the switching point at the lower of 30% or 300W, so that the two power ranges are complementary and the high-efficiency hybrid power topology circuit can also achieve optimal efficiency.

[0060] Taking a power supply with a full load power of 1000W as an example, the switching point can be set to 300W. In actual application scenarios, the sampling unit 51 collects the current signal and / or voltage signal of the high-efficiency hybrid power supply topology circuit. The control module 6 receives the current signal and / or voltage signal, calculates the power supply power based on the current signal and / or voltage signal, and then the control module 6 compares the power supply power with the preset 300W conversion power value. When the power supply power is greater than the preset 300W conversion power value, the control module 6 outputs the LLC control signal, the drive module 7 receives the LLC control signal, and switches the high-efficiency hybrid power supply topology circuit to the LLC resonant mode according to the LLC control signal; when the power supply power is less than the preset 300W conversion power value, the control module 6 outputs the ACF control signal, the drive module 7 receives the ACF control signal, and switches the high-efficiency hybrid power supply topology circuit to the ACF flyback mode according to the ACF control signal. In actual engineering applications, in order to ensure the stability of the circuit, the hysteresis is set to avoid errors causing the switching of the circuit working mode. When the high-efficiency hybrid power topology circuit switches to the ACF flyback mode, the hysteresis can be set to 5%-10% of the preset power. Taking the preset value of 300W as an example, the hysteresis value is 15W-30W, that is, the conversion power value when the LLC control signal switches the high-efficiency hybrid power topology circuit to the ACF flyback mode can be set to any value between 285W-270W.

[0061] In summary, by integrating the LLC resonant circuit and the ACF flyback circuit and setting the switching power, the high-efficiency hybrid power topology circuit is switched to the corresponding operating mode within a preset power range, making the high-efficiency hybrid power topology circuit more efficient.

[0062] The foregoing is merely an embodiment of the present invention and is not intended to limit the present invention. It will be apparent to those skilled in the art that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are intended to be included within the scope of the claims of the present invention.

Claims

1. A high-efficiency hybrid power supply topology circuit, characterized in that: include: A DC input module (1), a hybrid primary module (2), a power transformer T1, a synchronous rectification module (3) and a DC output module (4), wherein the hybrid primary module (2) comprises a resonance unit (21), a flyback unit (22) and a common unit (23), wherein the resonance unit (21), the flyback unit (22) and the common unit (23) are electrically connected to the primary winding of the power transformer T1, the DC input module (1) is connected in parallel with the hybrid primary module (2), the synchronous rectification module (3) is connected to the secondary winding of the power transformer T1, and the DC output module (4) is connected in parallel with the synchronous rectification module (3); When the high-efficiency hybrid power supply topology circuit switches to the LLC resonant mode, the resonant unit (21) and the common unit (23) are turned on, the flyback unit (22) is turned off, and the synchronous rectification module (3) switches to the LLC resonant mode; When the high-efficiency hybrid power supply topology circuit switches to the ACF flyback mode, the flyback unit (22) and the common unit (23) are turned on, the resonant unit (21) is turned off, and the synchronous rectification module (3) switches to the ACF flyback mode.

2. The high-efficiency hybrid power topology circuit according to claim 1, characterized in that: The resonant unit (21) includes a MOS transistor Q1, a MOS transistor Q2, a MOS transistor Q5 and an inductor L1; the flyback unit (22) includes a MOS transistor Q3, a MOS transistor Q4, a MOS transistor Q6 and a MOS transistor Q7; the shared unit (23) includes a MOS transistor Q8 and a capacitor C2; the source of the MOS transistor Q2 is respectively connected to the primary winding of the power transformer T1 and the drain of the MOS transistor Q8, the drain of the MOS transistor Q2 is connected to the drain of the MOS transistor Q1, and the source of the MOS transistor Q1 is connected to one end of the DC input module (1); one end of the inductor L1 is respectively connected to the MOS transistor Q 8, the other end of the DC input module (1) and the ground, the other end of the inductor L1 is connected to the source of the MOS transistor Q5, the drain of the MOS transistor Q5 is respectively connected to one end of the capacitor C2 and the source of the MOS transistor Q6, the other end of the capacitor C2 is respectively connected to the primary winding of the power transformer T1 and the source of the MOS transistor Q4; the drain of the MOS transistor Q4 is connected to the drain of the MOS transistor Q3; the source of the MOS transistor Q3 is respectively connected to the source of the MOS transistor Q1 and one end of the DC input module (1); the drain of the MOS transistor Q7 is connected to the drain of the MOS transistor Q6 The electrodes of the MOS transistor Q7 are connected to each other, the source electrode of the MOS transistor Q7 is respectively connected to the source electrode of the MOS transistor Q2, the primary winding of the power transformer T1 and the drain electrode of the MOS transistor Q8; the synchronous rectification module (3) is connected to the secondary winding of the power transformer T1, and the DC output module (4) is connected in parallel to the output end of the synchronous rectification module (3); when the high-efficiency hybrid power supply topology circuit switches to the LLC resonant mode, the MOS transistor Q8 is first disconnected, and then the MOS transistor Q3 and the MOS transistor Q4 are disconnected. After the MOS transistor Q3 and the MOS transistor Q4 are disconnected, the MOS transistor Q1 and the MOS transistor Q4 are closed according to a preset time delay. The MOS transistor Q5 is connected to the MOS transistor Q1 and the MOS transistor Q5, and then the MOS transistor Q6 and the MOS transistor Q7 are disconnected according to a preset time delay, and finally the MOS transistor Q2 is closed. When the high-efficiency hybrid power supply topology circuit switches to the ACF flyback mode, the MOS transistor Q8 is first disconnected, and then the MOS transistor Q6 is closed according to a preset time delay, and then the MOS transistor Q1 and the MOS transistor Q5 are disconnected. After the MOS transistor Q1 and the MOS transistor Q5 are disconnected, the MOS transistor Q3, the MOS transistor Q4 and the MOS transistor Q7 are closed according to a preset time delay, and finally the MOS transistor Q8 is closed.

3. The high-efficiency hybrid power topology circuit according to claim 1, characterized in that: The synchronous rectification module (3) comprises a MOS transistor Q9, a MOS transistor Q10 and a MOS transistor Q11; the source of the MOS transistor Q9 is connected to the secondary winding of the power transformer T1, the drain of the MOS transistor Q9 is connected to the drain of the MOS transistor Q10, and the source of the MOS transistor Q10 is respectively connected to the drain of the MOS transistor Q11 and one end of the DC output module (4); the source of the MOS transistor Q11 is connected to the secondary winding of the power transformer T1, and the other end of the DC output module (4) is grounded together with the secondary winding of the power transformer T1; when the high synchronous rectification module (3) switches to the LLC resonant mode, the MOS transistor Q9 and the MOS transistor Q10 are turned on, and the MOS transistor Q11 is closed; when the synchronous rectification module (3) switches to the ACF flyback mode, the MOS transistor Q9 and the MOS transistor Q10 are turned off, and the MOS transistor Q11 is turned on.

4. The high-efficiency hybrid power topology circuit according to claim 1, characterized in that: The DC input module (1) includes a capacitor C1, which is connected in parallel to the input end of the hybrid primary module (2). The DC output module (4) includes a capacitor C3 and a load R, which is connected in parallel to the output end of the synchronous rectification module (3). The load R is connected in parallel to the capacitor C3.

5. A power supply system comprising the high-efficiency hybrid power supply topology circuit according to any one of claims 1 to 4, further comprising: a sampling module (5), the sampling module (5) being electrically connected to the high-efficiency hybrid power topology circuit, and being used to collect current signals and / or voltage signals of the high-efficiency hybrid power topology circuit, and output the collected current signals and / or voltage signals; a control module (6) electrically connected to the sampling module (5), the control module (6) receiving the current signal and / or voltage signal sent by the sampling module (5), calculating the power supply power according to the current signal and / or voltage signal, and generating a driving signal according to the power supply power, and then the control module (6) outputs the driving signal; A driving module (7) is connected to the high-efficiency hybrid power topology circuit and the control module (6), respectively. The driving module (7) receives a driving signal output by the control module (6) and drives the high-efficiency hybrid power topology circuit to switch between an LLC resonant mode and an ACF flyback mode according to the driving signal.

6. The power supply system according to claim 5, characterized in that: The sampling module (5) includes a current sampling group (51) and / or a voltage sampling group (52), the current sampling group (51) includes an input current sampling unit (511) and / or an output current sampling unit (512), and the voltage sampling group (52) includes an input voltage sampling unit (521) and / or a voltage output sampling unit (522); one end of the input current sampling unit (511) is respectively connected to the DC input module (1) and the ground end, and the other end of the input current sampling unit (511) is connected to the hybrid primary module (2); the input voltage sampling unit (521) is connected in parallel to both ends of the DC input module (1); one end of the output current sampling unit (512) is connected to the DC output module (4); and the output voltage sampling unit (522) is connected in parallel to both ends of the DC output module (4).

7. The power supply system according to claim 5, characterized in that: The device further comprises an isolation module (8), wherein the isolation module (8) comprises a first isolation unit (81) and a second isolation unit (82), wherein one end of the first isolation unit (81) is connected to the sampling module (5), and the other end thereof is connected to the control module (6); and one end of the second isolation unit (82) is connected to the control module (6), and the other end thereof is connected to the driving module (7).

8. A method for controlling a power supply system, characterized in that: Applicable to the power supply system according to any one of claims 5 to 7, comprising the following steps: S1, preset conversion power; S2, the sampling module (5) collects the current signal and / or voltage signal of the high-efficiency hybrid power topology circuit, and sends the current signal and / or voltage signal to the control module (6); S3, the control module (6) receives the current signal and / or voltage signal sent by the sampling module (5), and calculates the power supply power according to the current signal and / or voltage signal. When the power supply power is greater than the preset conversion power, the control module (6) outputs the LLC control signal; when the power supply power is less than the preset conversion power, the control module (6) outputs the ACF control signal; S4. When the driving module (7) receives an LLC control signal, the driving module (7) controls the resonance unit (21) and the common unit (23) to be closed according to the control signal, the flyback unit (22) to be disconnected, and the synchronous rectification module (3) to be switched to the LLC resonance mode; when the driving module (7) receives an ACF control signal, the driving module (7) controls the flyback unit (22) and the common unit (23) to be closed according to the control signal, the resonance unit (21) to be disconnected, and the synchronous rectification module (3) to be switched to the ACF flyback mode.

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