Resonant circuit module, power supply and electronic device

Abstract

The present application relates to the technical field of server, in particular to a resonant circuit module, a power supply and an electronic device, the resonant circuit module comprises a power input port, a switch module, a resonant module, a power output port and a main control module, the resonant module is provided with a resonant inductor, an adjustable inductor group and a resonant capacitor, the inductance value of the adjustable inductor group is adjusted by the main control module, and when the switch frequency of the switch module is fixed, the output power of the resonant module is inversely proportional to the inductance value of the adjustable inductor group, and the inductance value of the adjustable inductor group can be directly adjusted by the main control module, so that the output characteristics of the resonant module can be changed without relying on frequency adjustment, and the delay problem of single frequency adjustment is solved, when the load mutation occurs, the output power can be directly improved by reducing the inductance value of the adjustable inductor group, without greatly adjusting the frequency, and the adjustment failure caused by the frequency dead zone is avoided.

Description

Technical Field

[0001] This application relates to the field of power supply technology, specifically to a resonant circuit module, power supply, and electronic equipment. Background Technology

[0002] Current power supplies generally use LLC resonant topology for power conversion. In the current LLC resonant topology, the output gain is optimized by adjusting the switching frequency in software when the load changes.

[0003] However, software operations and command transmission have delays. When faced with sudden heavy loads, frequency adjustments are difficult to quickly match gain requirements, which can easily lead to untimely loop adjustments.

[0004] Furthermore, if output gain is optimized solely by adjusting the switching frequency via software, the gain curve tends to flatten out once the frequency falls into a certain range, forming a "dead zone." This makes it impossible to effectively change the gain or meet the demands of ultra-high output. Moreover, the lag in gain enhancement can lead to "over-compensation" by the power regulation system, causing output voltage overshoot and damaging server hardware. Summary of the Invention

[0005] In view of this, the present invention provides a resonant circuit module, a power supply and an electronic device to solve the problems of untimely loop adjustment and output voltage overshoot when the output gain is optimized by only adjusting the switching frequency in software.

[0006] In a first aspect, the present invention provides a resonant circuit module, the resonant circuit module comprising: The switch module is equipped with a first switch and a second switch connected in series. The first terminal of the first switch is adapted to be connected to a power supply; the second terminal of the first switch is connected to the first terminal of the second switch; and the second terminal of the second switch is grounded. The resonant module includes a resonant inductor, an adjustable inductor group, and a resonant capacitor. One end of the resonant inductor is connected to the second end of the first switch, and the other end of the resonant inductor is connected to one end of the adjustable inductor group, which is used to output electrical energy. One end of the resonant capacitor is connected to the first end of the first switch, and the other end of the resonant capacitor is grounded. The main control module is electrically connected to the switch module and the adjustable inductor group; the inductance value of the adjustable inductor group is adjusted through the main control module; and when the switching frequency of the switch module is fixed, the output power of the resonant module is inversely proportional to the inductance value of the adjustable inductor group.

[0007] Beneficial Effects: Traditional resonant circuits use a fixed inductor design, relying solely on software adjustments to the switching frequency to adapt to the load. This results in slow response, untimely gain adjustment, and susceptibility to frequency dead zones, leading to output overshoot or insufficient power supply. This embodiment, however, utilizes an adjustable inductor group in conjunction with the main control module. The main control module can directly adjust the inductance value of the adjustable inductor group, thus changing the output characteristics of the resonant module without relying on frequency adjustments, solving the delay problem of single frequency modulation. Furthermore, since the output power is inversely proportional to the inductance value of the adjustable inductor group when the switching frequency is fixed, when there is a sudden load change, such as from 1300W to 2000W, the output power can be directly increased by reducing the inductance value of the adjustable inductor group without significant frequency adjustments, avoiding adjustment failures caused by frequency dead zones. Moreover, since the main control module can synchronously connect to the switching module and the adjustable inductor group, coordinated control of inductance and frequency can be achieved. This leverages the speed of inductor adjustment and ensures that the switching transistor operates in the ZVS range through frequency calibration, reducing losses. Furthermore, the series connection of the resonant inductor, adjustable inductor group, and resonant capacitor in the resonant module can ensure the continuity of the resonant circuit when the inductor is adjusted, avoid circuit breakage or parameter sudden changes, and ensure stable output.

[0008] Secondly, the present invention also provides a power supply comprising: a resonant circuit module as described in any of the above embodiments; the power supply further comprising: a transformer, a rectifier module, and a filter capacitor connected in sequence, wherein the power output port of the resonant circuit module is connected to the transformer.

[0009] Beneficial Effects: Traditional power supplies use a fixed inductor design in their resonant circuits, relying solely on software adjustments to the switching frequency to adapt to the load. This results in slow response, untimely gain adjustment, and susceptibility to frequency dead zones, leading to output overshoot or insufficient power supply. This embodiment, however, integrates an adjustable inductor group with the main control module. The main control module can directly adjust the inductance value of the adjustable inductor group, thus changing the output characteristics of the resonant module without relying on frequency adjustments, solving the delay problem of single frequency modulation. Furthermore, since the output power is inversely proportional to the inductance value of the adjustable inductor group when the switching frequency is fixed, when there is a sudden load change, such as from 1300W to 2000W, the output power can be directly increased by reducing the inductance value of the adjustable inductor group without significant frequency adjustments, avoiding adjustment failures caused by frequency dead zones. Moreover, since the main control module can synchronously connect to the switching module and the adjustable inductor group, coordinated control of inductance and frequency can be achieved. This leverages the speed of inductor adjustment and ensures that the switching transistor operates in the ZVS range through frequency calibration, reducing losses. Furthermore, the series connection of the resonant inductor, adjustable inductor group, and resonant capacitor in the resonant module can ensure the continuity of the resonant circuit when the inductor is adjusted, avoid circuit breakage or parameter sudden changes, and ensure stable power output.

[0010] Thirdly, the present invention also provides an electronic device comprising: a power supply as described in the above embodiments.

[0011] Beneficial Effects: Traditional power supplies use a fixed inductor design in their resonant circuits, relying solely on software adjustments to the switching frequency to adapt to the load. This results in slow response, untimely gain adjustment, and susceptibility to frequency dead zones, leading to output overshoot or insufficient power supply. This embodiment, however, integrates an adjustable inductor group with the main control module. The main control module can directly adjust the inductance value of the adjustable inductor group, thus changing the output characteristics of the resonant module without relying on frequency adjustments, solving the delay problem of single frequency modulation. Furthermore, since the output power is inversely proportional to the inductance value of the adjustable inductor group when the switching frequency is fixed, when there is a sudden load change, such as from 1300W to 2000W, the output power can be directly increased by reducing the inductance value of the adjustable inductor group without significant frequency adjustments, avoiding adjustment failures caused by frequency dead zones. Moreover, since the main control module can synchronously connect to the switching module and the adjustable inductor group, coordinated control of inductance and frequency can be achieved. This leverages the speed of inductor adjustment and ensures that the switching transistor operates in the ZVS range through frequency calibration, reducing losses. Furthermore, the series connection of the resonant inductor, adjustable inductor group, and resonant capacitor in the resonant module can ensure the continuity of the resonant circuit when the inductor is adjusted, avoid circuit breakage or parameter sudden changes, and ensure stable power output. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of the present invention, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the overall structure of the resonant circuit module in an embodiment of the present invention; Figure 2 This is a schematic diagram of the adjustable inductor group in an embodiment of the present invention; Figure 3 This is a schematic diagram of the current transformer protection module in an embodiment of the present invention.

[0014] Explanation of reference numerals in the attached figures: 10. Power input port; 20. Switch module; 21. First switch; 22. Second switch; 30. Resonant module; 31. Resonant inductor; 32. Adjustable inductor group; 321. Magnetic core; 322. Winding; 323. Third switch; 33. Resonant capacitor; 34. Transient protection tube; 40. Power output port; 50. Main control module; 60. Current transformer protection module; 61. Primary winding; 62. Secondary winding; 63. Sampling unit; 631. Rectifier bridge; 632. Sampling resistor; 64. Feedback unit; 641. Comparator; 642. Reference unit; 643. Fourth switch; 70. Power supply. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0017] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0018] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0019] For the power supply, in the original LLC loop, the inductances of the resonant inductor 31 and the magnetizing inductor are fixed from the initial design stage. This results in the k value (k=Lm / Lr, a key parameter balancing 'adjustment sensitivity' and 'soft-switching performance') not being dynamically adjustable. The output gain (Gain=Vout / Vin) can only be optimized by adjusting the switching frequency (fs) via software. According to the core characteristics of the LLC topology: when the operating frequency (fs) is lower than the inherent resonant frequency (fr), the smaller fs is, the larger the gain, and the smaller the k value (e.g., ...). Figures 1-3 (When k=1, Gain sensitivity is higher than when k=4 and k=16), and the Gain change is more significant within the same range of fs variation.

[0020] Therefore, in theory, reducing the value of k can quickly change Gain by simply fine-tuning fs, thus avoiding overshoot of the output Vout. However, existing techniques cannot achieve this optimization because the value of k is fixed, and can only rely on adjusting fs to adapt to load changes.

[0021] However, software operations and command transmission have inherent delays. When faced with sudden heavy loads (such as a sudden power demand from 1300W to 2000W), frequency adjustments cannot quickly match the gain requirements, and loop adjustments are prone to being delayed.

[0022] Meanwhile, if the output gain is optimized solely by adjusting the switching frequency in software, the gain curve tends to flatten out (i.e., the "dead zone") once the frequency falls into a certain range, making it impossible to effectively change the gain or meet the demand for ultra-large output. Furthermore, the lag in gain improvement can lead to "over-compensation" by the power supply regulation system, causing output voltage overshoot and damaging the server hardware.

[0023] In view of this, the present invention provides a resonant circuit module, power supply and electronic device to solve the problems of untimely loop adjustment and output voltage overshoot that occur when the output gain is optimized by adjusting the switching frequency solely through software.

[0024] The following is combined with Figures 1 to 3 The following describes embodiments of the present invention.

[0025] According to an embodiment of the present invention, a resonant circuit module is provided, which includes a switching module 20, a resonant module 30, and a main control module 50.

[0026] Specifically, in this embodiment of the invention, the switch module 20 is provided with a first switch 21 and a second switch 22 connected in series. The first end of the first switch 21 is used to connect to the power supply 70. The second end of the first switch 21 is connected to the first end of the second switch 22, and the second end of the second switch 22 is grounded.

[0027] In practical applications, a power input port 10 can be provided for connection to the power supply 70, and the first end of the first switch 21 is connected to the power input port 10. The power supply 70 can be a 400V DC bus or a power supply of other specifications. Of course, this embodiment is merely an example of the specifications of the power supply 70, but it is not a limitation. Those skilled in the art can modify it according to the actual situation, as long as the same technical effect is achieved.

[0028] The first switch 21 and the second switch 22 can be either electronic switches or switching transistors. Of course, this embodiment is merely an example illustrating the types of the first switch 21 and the second switch 22, and does not impose any limitations. Those skilled in the art can modify them according to actual circumstances, as long as the same technical effect is achieved.

[0029] Furthermore, in this embodiment of the invention, the resonant module 30 is provided with a resonant inductor 31, an adjustable inductor group 32, and a resonant capacitor 33. One end of the resonant inductor 31 is connected to the second end of the first switch 21, the other end of the resonant inductor 31 is connected to one end of the adjustable inductor group 32, one end of the resonant capacitor 33 is connected to the first end of the first switch 21, and the other end of the resonant capacitor 33 is grounded.

[0030] Furthermore, in this embodiment of the invention, the other end of the adjustable inductor group 32 can output electrical energy. Alternatively, a power output port 40 can be provided, connected to the other end of the adjustable inductor group 32. The main control module 50 is electrically connected to the switch module 20 and the adjustable inductor group 32, and the inductance value of the adjustable inductor group 32 is adjusted by the main control module 50.

[0031] For example, the adjustable inductor group 32 can be implemented by connecting multiple magnetizing inductors in series and parallel, and the magnetizing inductor in each parallel branch can be controlled by the main control module 50 to determine whether it is connected. The main control module 50 can control the number of magnetizing inductors connected in the parallel branch according to the actual situation, thereby controlling the inductance value of the entire adjustable inductor group 32.

[0032] Of course, this embodiment is merely an example of the composition of the adjustable inductor group 32, but it does not limit the scope of the embodiment. Those skilled in the art can make changes according to the actual situation, as long as the same technical effect can be achieved.

[0033] Furthermore, in this embodiment of the invention, when the switching frequency of the switching module 20 is fixed, the output power of the resonant module 30 is inversely proportional to the inductance value of the adjustable inductor group 32. Therefore, this solution can adjust the inductance value when the output current of the power supply changes transiently, thereby achieving the purpose of quickly adjusting the k-value curve and quickly adjusting the gain.

[0034] For example, in practical applications, the original power supply design has a 1300W output loop, and now it needs to be instantly boosted to 2000W output capability. The resonant inductor Lr value used is 50uH, and the output power (approximate) formula of the resonant circuit module can be simplified to: ; Where Pout is the output power, Vin is the input voltage, Cr is the capacitance of the resonant capacitor 33, k is the value of k, k=Lm / Lr, Lm is the magnetizing inductance, and Lr is the resonant inductance.

[0035] When the power increases from P1=1300W to P2=2000W, if Vin, Cr, and k remain constant, the core constraint is "power and..." "Approximately proportional"

[0036] Depend on Deformation can be obtained ; in, This is the resonant inductance corresponding to P1. This is the resonant inductance corresponding to P2; therefore, =21.125μH.

[0037] At this point, adjusting the resonant inductance to 21uH will achieve the desired effect.

[0038] However, considering the stability of the LLC loop, the switching frequency will be readjusted in time after the inductance changes. Similarly, the switching module 20 will also limit the upper limit of the switching frequency to 200kHz, so that the actual operating range also needs to be adjusted within the coverage range of ZVS, usually 0.8fr~1.2fr.

[0039] For example, based on the current usage, at a 1300W output, Cr=10nF, and the designed fr=70kHz; After instantaneously adjusting to 21uH: fr=109kHz, which also meets the requirement, so instantaneously adjusting the inductor to 21uH can meet the requirement.

[0040] After adjusting the inductor to increase the power, the peak current of the resonant inductor 31 will also increase, and the inductor current needs to be recalculated. We assume that fr=109kHz at 2000W, and based on the formula for inductor current, the inductor current can be obtained as 16A.

[0041] In practical selection, a period of 20A should be chosen to ensure the current-carrying capacity of the inductor core 321 and to avoid the risk of saturation. Simultaneously, the switching module 20 and the transformer in the power supply can be selected according to higher specifications. After switching the adjustable inductor group 32, the main control module 50 can adjust the switching frequency of the switching module 20.

[0042] This setup, due to the fixed inductor design of traditional resonant circuits, relies solely on software adjustments to the switching frequency to adapt to the load. This results in slow response, untimely gain adjustment, and a tendency to get stuck in the frequency dead zone, leading to output overshoot or insufficient power supply. In this embodiment, however, the adjustable inductor group 32 works in conjunction with the main control module 50, allowing the main control module 50 to directly adjust the inductance value of the adjustable inductor group 32. This eliminates the need for frequency adjustment to change the output characteristics of the resonant module 30, solving the delay problem of single frequency modulation. Furthermore, since the output power is inversely proportional to the inductance value of the adjustable inductor group 32 when the switching frequency is fixed, when there is a sudden load change, such as from 1300W to 2000W, the output power can be directly increased by reducing the inductance value of the adjustable inductor group 32 without significant frequency adjustment, avoiding adjustment failure caused by the frequency dead zone. Furthermore, since the main control module 50 can be synchronously connected to the switching module 20 and the adjustable inductor group 32, it can achieve coordinated control of inductance and frequency. This allows for the utilization of the rapid inductance adjustment while ensuring that the switching transistor operates in the ZVS range through frequency calibration, thus reducing losses. Moreover, the series connection of the resonant inductor 31, the adjustable inductor group 32, and the resonant capacitor 33 in the resonant module 30 ensures the continuity of the resonant circuit during inductance adjustment, preventing circuit breaks or parameter abrupt changes and ensuring stable output.

[0043] Furthermore, in an alternative embodiment, the adjustable inductor group 32 includes a magnetic core 321, a plurality of windings 322, and a plurality of third switches 323.

[0044] In this embodiment, multiple windings 322 are wound on the magnetic core 321, and each third switch 323 is connected to each winding 322. The number of third switches 323 corresponds one-to-one with the number of windings 322, and all third switches 323 are electrically connected to the main control module 50.

[0045] Therefore, the main control module 50 can control the number of the third switch 323 turned on according to the actual situation, thereby controlling the number of windings 322 connected, and thus adjusting the inductance of the adjustable inductor group 32.

[0046] Of course, the number of windings 322 and the third switch 323 can be, for example, two, three, four, five, six, etc. This embodiment is merely an example illustrating the number of windings 322 and the third switch 323, but it does not limit the number. Those skilled in the art can make changes according to actual circumstances, as long as the same technical effect is achieved.

[0047] In this configuration, the adjustable inductor group 32 of this embodiment consists of a magnetic core 321 and multiple windings 322. This allows the multiple windings 322 to share the same magnetic core 321, reducing parasitic inductance and distributed capacitance, ensuring the high-frequency characteristics of the resonant circuit, while simplifying the structure and reducing size. Furthermore, this embodiment maps multiple third switches 323 to multiple windings 322 one-to-one, allowing each winding 322 to be independently controlled. This enables the main control module 50 to selectively connect to a single winding 322, achieving precise, leveled control of the inductance value. Moreover, this embodiment electrically connects the third switches 323 to the main control module 50, ensuring that the operation of the third switches 323 is synchronized with the main control command, thereby avoiding switching delays or malfunctions.

[0048] Therefore, in this embodiment, the cooperation between the multiple windings 322 and the magnetic core 321 reduces interference between components and improves the stability of the resonant circuit. Multiple third switches 323 correspond one-to-one with multiple windings 322, enabling precise switching of inductance values. The appropriate winding 322 can be selected according to load requirements to meet inductance needs in different power scenarios, while the compact structure adapts to the limited installation space of the power supply.

[0049] Furthermore, in an optional embodiment, the adjustable inductor group 32 includes three windings 322 and three third switches 323 corresponding to the three windings 322; the inductance value of the first winding 322 is 5uH, the inductance value of the second winding 322 is 20uH, and the inductance value of the third winding 322 is 40uH.

[0050] Of course, this embodiment is merely an example illustrating the number of windings 322 and the third switch 323, as well as the inductance value of winding 322. However, it does not limit the scope of the embodiment. Those skilled in the art can make changes according to the actual situation, as long as the same technical effect can be achieved.

[0051] With this configuration, the inductances of the three windings 322 in this embodiment are 5μH, 20μH, and 40μH, respectively. These three windings 322, combined with the base fixed inductor, can form multiple levels of total inductance. In this embodiment, the 5μH winding 322 is suitable for instantaneous heavy loads, such as 2000W. When connected in series with the base inductor, the total inductance is small, the k-value is reduced, and the gain sensitivity is improved, thus quickly meeting high-power demands. Meanwhile, the 20μH winding 322 is suitable for conventional loads, such as 1300W, resulting in a moderate total inductance, thereby balancing gain and losses. Furthermore, the 40μH winding 322 is suitable for light loads, such as <500W. Its larger total inductance reduces energy loss in the resonant circuit and improves conversion efficiency.

[0052] Therefore, by setting clearly defined inductance levels, this embodiment eliminates the need for on-site adjustments during actual use. The main control module 50 can directly select the corresponding winding 322 based on the actual load power, thereby shortening the response time. Furthermore, since the three windings 322, combined with the basic fixed inductor, can form multiple total inductance levels, they offer full-scenario coverage, ensuring stable operation of the power supply under various conditions and enhancing system practicality and adaptability.

[0053] Furthermore, in an alternative implementation, the third switch 323 is a relay.

[0054] With this configuration, this embodiment uses a relay as the third switch 323. Compared to other switch types, the relay contacts have a withstand voltage of ≥400V and a current of ≥20A, making them suitable for the high-voltage, high-frequency characteristics of the main circuit. Furthermore, because the relay's response speed is <5μs, it can meet the switching requirements of winding 322 during sudden load changes. Moreover, since the relay contacts are mechanical, they have strong electromagnetic interference resistance, avoiding erroneous switching or jitter caused by high-frequency signals.

[0055] Therefore, in this embodiment, by setting the third switch 323 as a relay, the risk of switch breakdown is avoided because the relay has high voltage withstand capability. Its fast response characteristic ensures that the switching of winding 322 is synchronized with load changes, and its anti-interference capability ensures switching reliability, thereby improving the service life of adjustable inductor group 32 and the stability of the entire resonant circuit.

[0056] Furthermore, in an optional embodiment, the resonant module 30 further includes a transient protection tube 34, one end of which is connected to the second end of the first switch 21, and the other end of which is grounded.

[0057] With this configuration, when the adjustable inductor group 32 switches winding 322, a sudden change in inductance value will generate a transient inrush current. This current will act on electronic components such as the switching transistor and inductor, causing them to heat up, increase electrical stress, and even be damaged. Therefore, in this embodiment, a transient protection transistor 34 is placed between the second terminal of the first switch 21 and ground. When an inrush current occurs, the transient protection transistor 34 can quickly conduct, diverting the inrush current to ground and preventing current from flowing through the switching transistor or inductor. Furthermore, since the transient protection transistor 34 is adapted to high-frequency characteristics, it can also absorb high-frequency inrush currents, suppress circuit oscillations, and prevent resonance parameter disturbances caused by inrush currents.

[0058] Therefore, by setting up the transient protection tube 34, this embodiment can directly shunt the inrush current, reducing the electrical stress on the switching transistor, resonant inductor 31, and adjustable inductor group 32, and preventing electronic components from being damaged by instantaneous overcurrent. At the same time, it suppresses circuit oscillation, ensures the stability of resonant circuit parameters, and avoids output voltage fluctuations caused by inrush current.

[0059] Furthermore, in an alternative embodiment, the resonant module 30 also includes a fine-tuning inductor unit and an impact prediction module.

[0060] Specifically, in this embodiment, the fine-tuning inductor unit can be connected in series between the adjustable inductor group 32 and the resonant capacitor 33, and the impact prediction module can be electrically connected to the power output port 40 and the main control module 50 respectively.

[0061] In practical operation, the inductance of the fine-tuning inductor unit can be continuously fine-tuned via the main control module 50. For example, the fine-tuning inductor unit can be a hysteresis-type adjustable inductor or a piezoelectric ceramic adjustable inductor, with an inductance adjustment range of 0~10μH and an adjustment accuracy of 0.1μH. In this way, the fine-tuning inductor unit can form a combination of coarse and fine adjustment with the adjustable inductor group 32. That is, the adjustable inductor group 32 can be responsible for ranged coarse adjustment, while the fine-tuning inductor unit is responsible for continuous fine adjustment, thereby achieving precise matching of the total inductance.

[0062] As for the impact prediction module, it can be used to analyze the load change trend in real time and output a prediction signal to the main control module 50. For example, the impact prediction module can have a built-in load trend analysis algorithm to collect the current change rate of the power output port 40 in real time. When the current change rate is detected to exceed a preset threshold, a prediction signal is sent to the main control module 50 in advance. After receiving the prediction signal, the main control module 50 can first pre-adjust the inductance of the fine-tuning inductor unit to compensate for the gain in advance, and then synchronously control the switching of the multi-winding 322 and the frequency fine-tuning.

[0063] Therefore, in the above embodiment, if only the adjustable inductor group 32 is set, only leveled inductance switching, such as 5μH, 20μH, and 40μH, can be achieved, resulting in a certain inductance gap problem. When the target inductance required by the load is between two levels, such as 10μH and 30μH, only an approximate level can be selected, leading to insufficient gain matching accuracy and the possibility of small output fluctuations.

[0064] In this embodiment, by further setting the fine-tuning inductor unit, the fine-tuning inductor unit and the adjustable inductor group 32 can form a combination of coarse and fine adjustment, which can greatly improve the adjustment accuracy of the total inductance. To a certain extent, it can fully match the precise inductance requirements of different loads, thereby reducing gain error and avoiding small output fluctuations.

[0065] Furthermore, by setting up an impact prediction module, this embodiment can significantly reduce the peak impact current during inductor switching by utilizing the early prediction and pre-adjustment actions of the impact prediction module. Combined with the pre-conduction of the transient protection tube 34, it can further reduce the electrical stress of components and extend the service life of the switching tube and inductor.

[0066] Meanwhile, the fine-tuning inductor unit can be connected in series in the original resonant circuit. The impact prediction module only needs to add signal acquisition and algorithm processing functions. There is no need to change the connection relationship of the original components. It can be directly integrated into the existing module structure, thereby reducing the modification cost.

[0067] Furthermore, in an optional embodiment, the first switch 21 and the second switch 22 are switching transistors.

[0068] With this configuration, the first switch 21 and the second switch 22 in this embodiment are set as switching transistors, such as MOSFETs and transistors. Since the switching transistors have low on-resistance and fast switching speed, they can meet the switching requirements of high-frequency resonant circuits. At the same time, the switching transistors can support ZVS soft switching, and combined with the resonant characteristics of LLC resonant topology, they can be switched on and off when the voltage across the switching transistors is close to zero, avoiding voltage and current cross-loss caused by hard switching.

[0069] Therefore, in this embodiment, the first switch 21 and the second switch 22 are configured as switching transistors, which meets the operating frequency requirements of the resonant circuit and also enables ZVS soft switching to reduce switching losses, thereby reducing module heating and electromagnetic interference. At the same time, the low on-resistance of the switching transistors further reduces conduction losses, improves module conversion efficiency, and extends the service life of components.

[0070] Furthermore, in an optional implementation, the main control module 50 is a DSP control chip.

[0071] In this embodiment, the main control module 50 uses a DSP control chip. Since the DSP control chip has a processing speed of ≥100 MIPS, it can quickly process the output voltage and current signals and calculate the appropriate inductance value and switching frequency in real time. Simultaneously, the DSP control chip supports multi-channel synchronous control, meaning it can simultaneously send control commands to the switching module 20 and the adjustable inductor group 32, achieving synchronous execution of inductor switching and frequency fine-tuning without delay. Furthermore, the DSP control chip also has an interrupt response function, which, in subsequent embodiments, can quickly receive feedback signals from the current transformer protection module 60 and promptly trigger the switching module 20 to shut down.

[0072] Therefore, this embodiment uses a DSP control chip for the main control module 50. The high-speed computing power of the DSP control chip shortens the signal processing and command issuance time, ensuring synchronous inductor adjustment and frequency fine-tuning during load changes, thus avoiding output overshoot or delay. Furthermore, multi-channel synchronous control and fast interrupt response improve the module's control accuracy and protection reliability, further stabilizing the output voltage.

[0073] Furthermore, in an optional embodiment, the resonant circuit module further includes a current transformer protection module 60. One end of the current transformer protection module 60 is connected to the first end of the first switch 21. When a power input port 10 is provided, one end of the current transformer protection module 60 is connected to the power input port 10, and the other end of the current transformer protection module 60 is adapted to be connected to the power supply 70.

[0074] Furthermore, the current transformer protection module 60 is electrically connected to the main control module 50; when the current transformer protection module 60 detects that the operating parameters exceed the preset threshold, the main control module 50 controls the switch module 20 to turn off.

[0075] The operating parameters can be either operating current or operating voltage. Of course, this embodiment is merely an example to illustrate the types of operating parameters, and is not intended to limit them. Those skilled in the art can modify them according to actual circumstances, as long as the same technical effect is achieved.

[0076] With this setup, traditional resonant circuits lack targeted overcurrent protection devices. When inductor switching generates inrush current or a load short circuit occurs, the main circuit cannot be cut off in time, leading to damage to core components such as switching transistors and transformers, and even affecting server hardware. Therefore, in this embodiment, the current transformer protection module 60 is connected in series between the power supply 70 and the power input port 10. This allows for real-time monitoring of operating parameters such as main circuit current and voltage, thus providing comprehensive coverage of the power supply path. Simultaneously, this embodiment electrically connects the current transformer protection module 60 to the main control module 50. When an abnormal current occurs, it can quickly provide feedback, enabling the main control module 50 to directly control the switching module 20 to shut down, cutting off the main circuit power supply.

[0077] Therefore, this embodiment, by setting up a current transformer protection module 60, can monitor the main circuit operating parameters in real time and trigger protection actions within 10μs to prevent overcurrent and overvoltage damage to the switching module 20 and resonant module 30. Simultaneously, it quickly cuts off power supply to prevent the fault from escalating to the server hardware, thus improving the safety of the entire power supply system.

[0078] Furthermore, in an optional implementation, the current transformer protection module 60 includes a primary winding 61, a secondary winding 62, a sampling unit 63, and a feedback unit 64.

[0079] Specifically, in this embodiment, one end of the primary winding 61 is connected to the first end of the first switch 21. Similarly, when a power input port 10 is provided, one end of the primary winding 61 is connected to the power input port 10, and the other end of the primary winding 61 is adapted to be connected to the power supply 70. Both ends of the secondary winding 62 are connected to the sampling unit 63. One end of the feedback unit 64 is connected to the sampling unit 63, and the other end of the feedback unit 64 is connected to the main control module 50. In this embodiment, the primary winding 61 is formed by the wire between the power supply 70 and the first connection end of the first switch 21 passing through the core window of the transformer, thus eliminating the need for an additional winding 322, which simplifies installation and reduces parasitic inductance in the main circuit.

[0080] In actual operation, when the sampling unit 63 detects that the working parameters exceed the preset threshold, the feedback unit 64 sends a feedback signal to the main control module 50, and the main control module 50 controls the switch module 20 to turn off.

[0081] For example, in this embodiment, the sampling unit 63 can be a sampling resistor 632, which can collect a portion of the voltage division from the power supply 70. The feedback unit 64 can be composed of a comparator 641, with one input being a reference value and the other input being the voltage division from the sampling resistor 632. When the sampling unit 63 detects that the operating parameters exceed a preset threshold, that is, when the sampling unit 63 detects that the operating parameters exceed the reference value, the signal output by the comparator 641 changes. The signal output by the comparator 641 is the feedback signal. Therefore, when the main control module 50 detects that the feedback signal has changed, it can promptly control the switch module 20 to shut down, thereby providing protection.

[0082] Of course, this embodiment is merely an example illustrating the type and cooperation method of the sampling unit 63 and the feedback unit 64, but it does not limit them. Those skilled in the art can make changes according to the actual situation, as long as the same technical effect can be achieved.

[0083] With this configuration, the primary winding 61 is connected in series with the main circuit in this embodiment, allowing for precise sensing of the main circuit current through electromagnetic induction without direct contact with high voltage. Simultaneously, connecting the secondary winding 62 to the sampling unit 63 converts the high-voltage, high-current signal into a low-voltage, low-current signal, facilitating sampling and processing, while also achieving high-voltage isolation to prevent high-voltage interference from damaging the DSP control chip. Furthermore, the timely feedback unit 64 transmits signals, accurately relaying the sampled abnormal signals to the main control module 50. Precise sensing and signal transmission ensure accurate protection threshold judgment, reduce false triggering, and improve the overall protection reliability of the equipment.

[0084] Furthermore, in an optional implementation, the sampling unit 63 is a rectifier bridge 631 and a sampling resistor 632 connected in series.

[0085] In this configuration, the traditional sampling unit 63 only uses the sampling resistor 632. This direct sampling of the AC signal results in large signal fluctuations and excessive noise, leading to significant errors in protection threshold judgment and potentially causing false or missed protection. In this embodiment, a rectifier bridge 631 is connected in series at the front end of the sampling unit 63. This converts the AC induced signal from the secondary winding 62 into a DC signal, filtering out high-frequency noise and stabilizing the signal. Simultaneously, the filtering effect of the rectifier bridge 631 effectively reduces the amplitude of the sampled signal fluctuations. The stable DC signal ensures that the voltage signal output by the sampling resistor 632 accurately reflects the main circuit's operating parameters. Furthermore, the accurate sampling signal allows the main control module 50 to accurately determine whether protection has been triggered, avoiding frequent module start-stops or missed fault detections caused by misjudgments.

[0086] Furthermore, in an alternative implementation, the feedback unit 64 includes a comparator 641 and a fourth switch 643.

[0087] Specifically, in this embodiment, the first input terminal of comparator 641 is connected to sampling unit 63, the second input terminal of comparator 641 is connected to reference unit 642, and the output terminal of comparator 641 outputs a comparison signal. The control terminal of fourth switch 643 is connected to the output terminal of comparator 641, and the output terminal of fourth switch 643 is connected to main control module 50.

[0088] In this embodiment, the reference unit 642 outputs a reference voltage. When the sampling unit 63 detects that the operating parameters exceed the reference voltage, the signal output by the comparator 641 changes. This causes a change in the state of the fourth switch 643, for example, the fourth switch 643 changes from an on state to an off state. At this time, the feedback signal received by the main control module 50 also changes, allowing it to promptly control the switch module 20 to turn off, thereby providing a protective function.

[0089] When the sampling unit 63 detects that the operating parameters do not exceed the reference voltage, the signal output by the comparator 641 will not change. This will also prevent the state of the fourth switch 643 from changing; for example, the fourth switch 643 will remain either on or off. At this time, the feedback signal received by the main control module 50 will not change, so there is no need to control the operating state of the switch module 20, allowing the entire device to operate normally.

[0090] In this configuration, the traditional feedback unit 64 uses only a single wire to transmit the signal, which is susceptible to electromagnetic interference leading to signal distortion, and lacks a clear threshold comparison mechanism, resulting in untimely triggering of protection actions. In contrast, this embodiment uses a combination of comparator 641 and reference unit 642. The reference unit 642 provides a stable protection threshold voltage, and the comparator 641 compares the voltage signal from the sampling unit 63 with the threshold in real time, significantly shortening the response time. Furthermore, the fourth switch 643 can quickly transmit signals, sending the comparison result of the comparator 641, such as a high-level signal or a low-level signal, to the main control module 50 by switching the fourth switch 643 on and off, avoiding interference during signal transmission.

[0091] Therefore, in this embodiment, the stable threshold of the reference unit 642 ensures the consistency of protection actions, the fast comparison of the comparator 641 shortens the signal processing time, and the signal is then transmitted to the main control module 50 by the on / off state of the fourth switch 643, which simplifies the signal processing and identification, thereby greatly reducing the total delay of the protection signal from sampling to triggering, ensuring timely disconnection of the main circuit and avoiding component damage.

[0092] Furthermore, in an alternative implementation, comparator 641 is a high-speed comparator 641.

[0093] With this configuration, this embodiment uses a high-speed comparator 641, which improves the response speed. It can complete the comparison between the sampled signal and the threshold within a very short time after the instantaneous overcurrent occurs and output a trigger signal. The fast response characteristics of the high-speed comparator 641 ensure that the protection action is triggered during the duration of the instantaneous overcurrent, avoiding the overcurrent acting on components such as switching transistors and inductors for a long time, reducing the electrical stress on components, and improving the effectiveness and reliability of the protection.

[0094] Furthermore, in an alternative implementation, the fourth switch 643 is an isolation optocoupler.

[0095] With this configuration, traditional switches, such as transistors, lack electrical isolation. Interference signals from the high-voltage main circuit can easily be transmitted to the main control module 50 through the switch, causing malfunctions or damage to the DSP main control chip. In contrast, the fourth switch 643 in this embodiment uses an isolation optocoupler, which can transmit protection trigger signals via optical signals, achieving electrical isolation and avoiding direct electrical connection between the high-voltage and low-voltage circuits. Simultaneously, the optocoupler has strong anti-electromagnetic interference capabilities, filtering high-frequency noise and ensuring accurate signal transmission.

[0096] Therefore, this embodiment, by employing photoelectric conversion with an isolated optocoupler, can block the path of high voltage entering the low voltage control circuit, protecting the DSP control chip from high voltage damage; the anti-interference capability ensures that the protection signal is accurately transmitted in a high-frequency resonant environment, avoiding false triggering or missed triggering.

[0097] In a second aspect, the present invention also provides a power supply comprising a resonant circuit module as described in any of the above embodiments.

[0098] This configuration, due to the fixed inductor design of the resonant circuit in traditional power supplies, relies solely on software adjustments to the switching frequency to adapt to the load. This results in slow response, untimely gain adjustment, and a tendency to get stuck in the frequency dead zone, leading to output overshoot or insufficient power supply. In this embodiment, however, by integrating an adjustable inductor group 32 with the main control module 50, the main control module 50 can directly adjust the inductance value of the adjustable inductor group 32. This eliminates the need for frequency adjustment to change the output characteristics of the resonant module 30, solving the delay problem of single frequency modulation. Furthermore, since the output power is inversely proportional to the inductance value of the adjustable inductor group 32 when the switching frequency is fixed, when there is a sudden load change, such as from 1300W to 2000W, the output power can be directly increased by reducing the inductance value of the adjustable inductor group 32 without significant frequency adjustment, avoiding adjustment failure caused by the frequency dead zone. Furthermore, since the main control module 50 can be synchronously connected to the switching module 20 and the adjustable inductor group 32, it can achieve coordinated control of inductance and frequency. This allows for the utilization of the rapid inductance adjustment while ensuring that the switching transistor operates in the ZVS range through frequency calibration, thus reducing losses. Moreover, the series connection of the resonant inductor 31, the adjustable inductor group 32, and the resonant capacitor 33 in the resonant module 30 ensures the continuity of the resonant circuit during inductance adjustment, preventing circuit breaks or parameter abrupt changes and ensuring stable power output.

[0099] Furthermore, in an optional embodiment, the power supply further includes: a transformer, a rectifier module, and a filter capacitor connected in sequence, with the power output port 40 of the resonant circuit module connected to the transformer.

[0100] With this configuration, this embodiment connects the transformer to the output port of the resonant circuit module, which can step down the high-frequency, high-voltage AC power output by the module to the low-voltage AC power required by the server hardware. Then, connecting the rectifier module to the transformer can convert the low-voltage AC power into unidirectional pulsating DC power. Furthermore, the filter capacitor can filter out the ripple in the pulsating DC power, outputting stable low-voltage DC power.

[0101] Therefore, in this embodiment, the precise voltage reduction of the transformer can adapt to the voltage requirements of the hardware. The unidirectional conversion of the rectifier bridge 631 and the ripple suppression of the filter capacitor make the output voltage stable, meeting the requirements of core hardware such as CPU and graphics card for power supply ripple and stability, thereby improving the working stability and service life of the server hardware.

[0102] Thirdly, the present invention also provides an electronic device comprising: a power supply as described in the above embodiments.

[0103] In this embodiment, the electronic device can be any electrical appliance that uses electrical energy, a server, or other electrical equipment.

[0104] Traditional power supplies use a fixed inductor design in their resonant circuits, relying solely on software adjustments to the switching frequency to suit the load. This results in slow response, untimely gain adjustment, and susceptibility to frequency dead zones, leading to output overshoot or insufficient power supply. This embodiment addresses this by integrating an adjustable inductor group with the main control module. The main control module can directly adjust the inductance value of the adjustable inductor group, thus changing the output characteristics of the resonant module without relying on frequency adjustments, solving the delay problem of single frequency modulation. Furthermore, since the output power is inversely proportional to the inductance value of the adjustable inductor group when the switching frequency is fixed, sudden load changes, such as from 1300W to 2000W, can directly increase the output power by reducing the inductance value of the adjustable inductor group without significant frequency adjustments, avoiding adjustment failures caused by frequency dead zones. Moreover, because the main control module can synchronously connect to the switching module and the adjustable inductor group, coordinated control of inductance and frequency is achieved. This leverages the speed of inductor adjustment and ensures the switching transistor operates in the ZVS range through frequency calibration, reducing losses. Furthermore, the series connection of the resonant inductor, adjustable inductor group, and resonant capacitor in the resonant module can ensure the continuity of the resonant circuit when the inductor is adjusted, avoid circuit breakage or parameter sudden changes, and ensure stable power output.

[0105] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A resonant circuit module, characterized in that, include: The switch module (20) is provided with a first switch (21) and a second switch (22) connected in series. The first end of the first switch (21) is adapted to be connected to the power supply (70), the second end of the first switch (21) and the first end of the second switch (22) are connected, and the second end of the second switch (22) is grounded. The resonant module (30) is provided with a resonant inductor (31), an adjustable inductor group (32), and a resonant capacitor (33); one end of the resonant inductor (31) is connected to the second end of the first switch (21), and the other end of the resonant inductor (31) is connected to one end of the adjustable inductor group (32), the other end of the adjustable inductor group (32) is used to output electrical energy; one end of the resonant capacitor (33) is connected to the first end of the first switch (21), and the other end of the resonant capacitor (33) is grounded; The main control module (50) is electrically connected to the switch module (20) and the adjustable inductor group (32); the inductance value of the adjustable inductor group (32) is adjusted by the main control module (50); and when the switching frequency of the switch module (20) is fixed, the output power of the resonant module (30) is inversely proportional to the inductance value of the adjustable inductor group (32).

2. The resonant circuit module according to claim 1, characterized in that, The adjustable inductor group (32) includes: Magnetic core (321); Multiple windings (322) are wound around the magnetic core (321); Multiple third switches (323) are connected to each winding (322), and the number of third switches (323) corresponds one-to-one with the number of windings (322). All third switches (323) are electrically connected to the main control module (50).

3. The resonant circuit module according to claim 2, characterized in that, The adjustable inductor group (32) includes three windings (322) and three third switches (323) corresponding to the three windings (322); the inductance value of the first winding (322) is 5uH, the inductance value of the second winding (322) is 20uH, and the inductance value of the third winding (322) is 40uH.

4. The resonant circuit module according to any one of claims 1 to 3, characterized in that, The resonant module (30) also includes: Transient protection tube (34), one end of which is connected to the second end of the first switch (21), and the other end of which is grounded.

5. The resonant circuit module according to any one of claims 1 to 3, characterized in that, The resonant circuit module also includes: A current transformer protection module (60) is provided, one end of which is connected to the first end of the first switch (21), and the other end of which is adapted to be connected to the power supply (70). The current transformer protection module (60) is electrically connected to the main control module (50); when the current transformer protection module (60) detects that the working parameters exceed the preset threshold, the main control module (50) controls the switch module (20) to turn off.

6. The resonant circuit module according to claim 5, characterized in that, The current transformer protection module (60) includes: Primary winding (61), one end of which is connected to the first end of the first switch (21), and the other end of which is adapted to be connected to the power supply (70); Secondary winding (62), the two ends of which are connected to sampling unit (63); Feedback unit (64), one end of which is connected to the sampling unit (63), and the other end of which is connected to the main control module (50); When the sampling unit (63) detects that the working parameters exceed the preset threshold, the feedback unit (64) sends a feedback signal to the main control module (50), and the main control module (50) controls the switch module (20) to turn off.

7. The resonant circuit module according to claim 6, characterized in that, The sampling unit (63) consists of a rectifier bridge (631) and a sampling resistor (632) connected in series.

8. The resonant circuit module according to claim 7, characterized in that, The feedback unit (64) includes: A comparator (641) is provided, wherein the first input terminal of the comparator (641) is connected to the sampling unit (63), the second input terminal of the comparator (641) is connected to the reference unit (642), and the output terminal of the comparator (641) outputs a comparison signal. The fourth switch (643) is connected to the output of the comparator (641); the output of the fourth switch (643) is connected to the main control module (50).

9. A power supply, characterized in that, include: The resonant circuit module as described in any one of claims 1 to 8; The power supply also includes a transformer, a rectifier module and a filter capacitor connected in sequence, and the power output port (40) of the resonant circuit module is connected to the transformer.

10. An electronic device, characterized in that, include: The power supply as described in claim 9.

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