Magnetic integration device, low-voltage high-power adjustable power supply and low-voltage system

Abstract

The utility model relates to the technical field of high-frequency switching power supplies, and mainly provides a magnetic integration device, a low-voltage high-power adjustable power supply and a low-voltage system, the power supply comprises a first transformer and a second transformer, the device comprises a first inductor and a second inductor which are connected with the first transformer, and a third inductor and a fourth inductor which are connected with the second transformer, the first inductor is further connected with the third inductor, and the second inductor is further connected with the fourth inductor. When the voltage of the first transformer / the second transformer abnormally rises, the voltage at the two ends of the first inductor and the voltage at the two ends of the second inductor are limited through the third inductor and the fourth inductor by means of the connection between the first inductor and the third inductor and the connection between the second inductor and the fourth inductor. Voltage at the two ends of the third inductor and the fourth inductor is limited through the first inductor and the second inductor, so that the voltage transformation module outputs a fixed voltage value. Therefore, voltage oscillation at the two ends of the transformer when four independent inductors are adopted can be eliminated by limiting the voltage of the transformer.

Description

Technical Field

[0001] This utility model relates to the field of high-frequency switching power supplies, and in particular to a magnetic integrated device, a low-voltage high-power adjustable power supply, and a low-voltage system. Background Technology

[0002] In high-power, low-voltage, full-range adjustable, high-current output power supply applications, the voltage drop of the secondary circuit has a significant impact on efficiency. High current places higher demands on transformer manufacturing processes, presents challenges to transformer cooling, and also requires higher current ratings for rectifier diodes or synchronous rectifier MOSFETs. The current multiplier rectifier circuit evolved from the full-bridge rectifier circuit; it can be transformed into a current multiplier rectifier circuit by replacing one of the switching transistors in one arm of the full-bridge rectifier circuit with an inductor. In a current multiplier rectifier circuit, the transformer secondary winding only requires one winding, which reduces the manufacturing difficulty compared to the center-tapped winding required in a full-wave rectifier circuit. The number of switching devices in a current multiplier rectifier circuit is half that of a full-bridge rectifier circuit, and under the same output current, the current flowing through the transformer secondary winding in a current multiplier rectifier circuit is half that of a full-bridge rectifier circuit. The average current of the two filter inductors in a current multiplier rectifier circuit is only half that of the output current, reducing output current ripple under the same conditions.

[0003] Since the current multiplier rectifier circuit has two inductors, four inductors are required when the primary winding of the transformer is connected in series and the secondary winding is connected in parallel. The discrete filter inductor resonates with the parasitic parameters of the transformer, which can easily cause voltage oscillation at both ends of the transformer winding. Utility Model Content

[0004] This utility model provides a magnetic integrated device, a low-voltage high-power adjustable power supply, and a low-voltage system, which helps to solve the technical problem of voltage oscillation at both ends of the transformer windings in existing low-voltage systems with two transformer primary windings connected in series and secondary windings connected in parallel during current multiplier rectification, due to the resonance between the discrete filter inductor and the transformer parasitic parameters.

[0005] One technical solution adopted in this utility model embodiment is as follows: A magnetic integrated device is provided for use in a low-voltage, high-power adjustable power supply. The low-voltage, high-power adjustable power supply includes a transformer module, which includes a first transformer and a second transformer. The transformer module is configured to output a fixed voltage value. The magnetic integrated device includes a first inductor, a second inductor, a third inductor, and a fourth inductor. The first inductor is connected to the same-name terminal of the secondary winding of the first transformer. The second inductor is connected to the non-same-name terminal of the secondary winding of the first transformer. The third inductor is connected to the same-name terminal of the secondary winding of the second transformer. The fourth inductor is connected to the non-same-name terminal of the secondary winding of the second transformer. The first inductor is also connected to the third inductor, and the second inductor is also connected to the fourth inductor. When the secondary winding of the first transformer outputs a positive voltage, the current of the first inductor gradually increases with the positive voltage, and when the secondary winding of the first transformer outputs a negative voltage, the current gradually decreases with the negative voltage. When the voltage of the second transformer rises abnormally, the voltage across the third and fourth inductors is limited by the second inductor to ensure that the transformer module outputs a fixed voltage value. The second inductor is used so that when the secondary winding of the first transformer outputs a negative voltage, the current gradually increases with the negative voltage, and when the secondary winding of the first transformer outputs a positive voltage, the current gradually decreases with the positive voltage. The third inductor is used so that when the secondary winding of the second transformer outputs a positive voltage, the current gradually increases with the positive voltage, and when the secondary winding of the second transformer outputs a negative voltage, the current gradually decreases with the negative voltage. When the voltage of the first transformer rises abnormally, the fourth inductor is used to limit the voltage across the first and second inductors to ensure that the transformer module outputs a fixed voltage value. The fourth inductor is used so that when the secondary winding of the second transformer outputs a negative voltage, the current gradually increases with the negative voltage, and when the secondary winding of the second transformer outputs a positive voltage, the current gradually decreases with the positive voltage.

[0006] In some embodiments, the first inductor, the second inductor, the third inductor, and the fourth inductor each include a main winding and an auxiliary winding coupled to each other. The same-name terminal of the main winding of the first inductor is used to connect with the same-name terminal of the secondary winding of the first transformer; the same-name terminal of the main winding of the second inductor is used to connect with the non-same-name terminal of the secondary winding of the first transformer; the same-name terminal of the main winding of the third inductor is used to connect with the same-name terminal of the secondary winding of the second transformer; the same-name terminal of the main winding of the fourth inductor is used to connect with the non-same-name terminal of the secondary winding of the second transformer; the same-name terminal of the auxiliary winding of the first inductor is connected to the same-name terminal of the auxiliary winding of the third inductor; and the same-name terminal of the auxiliary winding of the second inductor is connected to the same-name terminal of the auxiliary winding of the fourth inductor.

[0007] In some embodiments, the magnetic integrated device further includes a first capacitor and a second capacitor, the first capacitor being connected to the non-same-name terminals of the auxiliary windings of the first inductor and the third inductor, respectively, and the second capacitor being connected to the non-same-name terminals of the auxiliary windings of the second inductor and the fourth inductor, respectively.

[0008] In some embodiments, the magnetically integrated device further includes a switching module, which is connected to the secondary windings of the first transformer and the second transformer, respectively. The switching module is also connected to the first inductor, the second inductor, the third inductor, and the fourth inductor, respectively. The switching module is also used to receive control signals. After receiving the control signals, the switching module is used to apply the positive voltage output by the secondary windings of the first transformer and the second transformer to the first inductor and the third inductor, so that the current flowing through the first inductor and the third inductor gradually increases under the action of the positive voltage; and to apply the negative voltage output by the secondary windings of the first transformer and the second transformer to the second inductor and the fourth inductor according to the control signals, so that the current flowing through the second inductor and the fourth inductor gradually increases under the action of the negative voltage.

[0009] In some embodiments, the switching module is configured to control the current in the first inductor and the third inductor to increase by a preset increment and the current in the second inductor and the fourth inductor to decrease by a preset decrease when the secondary windings of the first transformer and the second transformer output positive voltages; and to control the current in the first inductor and the third inductor to decrease by a preset decrease and the current in the second inductor and the fourth inductor to increase by a preset increment when the secondary windings of the first transformer and the second transformer output negative voltages.

[0010] In some embodiments, the low-voltage high-power adjustable power supply further includes a filter module connected to a first inductor, a second inductor, a third inductor, and a fourth inductor. The switching module includes a first switching transistor, a second switching transistor, a third switching transistor, and a fourth switching transistor. The first terminal of the first switching transistor is connected to the same-name terminal of the secondary winding of the first transformer and the first inductor, respectively. The second terminal of the first switching transistor is connected to the first terminal of the second switching transistor and is also connected to the filter module. The second terminal of the second switching transistor is connected to the non-same-name terminal of the secondary winding of the first transformer and the second inductor, respectively. The first terminal of the third switching transistor is connected to the same-name terminal of the secondary winding of the second transformer and the third inductor, respectively. The third switch is connected to the first terminal of the fourth switch. The second terminal of the third switch is also connected to the filter module. The second terminal of the fourth switch is connected to the non-same-name terminals of the secondary windings of the fourth inductor and the second transformer, respectively. The first, second, third, and fourth switches are also connected to the controller. The first, second, third, and fourth switches are all used to receive the control signal output by the controller and are alternately turned on according to the control signal. The first and third switches have the same on / off state, the second and fourth switches have the same on / off state, and the first and second switches are alternately turned on.

[0011] In some embodiments, the turns ratios of the first inductor, the second inductor, the third inductor, and the fourth inductor are all the same.

[0012] To solve the above-mentioned technical problems, another technical solution adopted in this utility model embodiment is: providing a low-voltage, high-power adjustable power supply, which includes a phase-shifting full-bridge circuit, a transformer module, a filter module, and the aforementioned magnetic integrated device; the transformer module includes a first transformer and a second transformer, the winding structure and turns ratio of the first transformer are the same as those of the second transformer, the primary winding of the first transformer and the primary winding of the second transformer are connected in series, and the primary windings of the first transformer and the second transformer are respectively connected to the phase-shifting full-bridge circuit, and the secondary windings of the first transformer and the second transformer are connected in series. The phase-shifting full-bridge circuit is connected in parallel with the magnetic integrated device to receive the bus voltage. The magnetic integrated device is also connected to the filter module, and the phase-shifting full-bridge circuit is also connected to the controller. The phase-shifting full-bridge circuit receives the drive signal output by the controller and converts the bus voltage based on the drive signal to output the corresponding voltage signal to the transformer module. After receiving the voltage signal, the transformer module divides the voltage signal and converts the divided voltage signal based on the corresponding turns ratio to output the preset voltage to the magnetic integrated device. After receiving the preset voltage, the magnetic integrated device outputs the preset voltage to the filter module to output the target voltage based on the filter module.

[0013] In some embodiments, the corresponding terminal of the primary winding of the first transformer is located at the first position of the first transformer, and the corresponding terminal of the primary winding of the second transformer is located at the first position of the second transformer; the corresponding terminal of the secondary winding of the first transformer is located at the second position of the first transformer, and the corresponding terminal of the secondary winding of the second transformer is located at the second position of the second transformer.

[0014] Another technical solution adopted in this utility model embodiment is: providing a low-voltage system, the low-voltage system including: a controller; and the low-voltage high-power adjustable power supply as described above.

[0015] Unlike related technologies, this utility model provides a magnetic integrated device, a low-voltage high-power adjustable power supply, and a low-voltage system. The device includes a first inductor, a second inductor, a third inductor, and a fourth inductor. The first inductor is used to connect to the same-name terminal of the secondary winding of the first transformer, the second inductor is used to connect to the non-same-name terminal of the secondary winding of the first transformer, the third inductor is used to connect to the same-name terminal of the secondary winding of the second transformer, and the fourth inductor is used to connect to the non-same-name terminal of the secondary winding of the second transformer. The first inductor is also connected to the third inductor, and the second inductor is also connected to the fourth inductor. The first and third inductors are used so that when a positive voltage is output from the secondary windings of the first and second transformers, the current gradually increases with the positive voltage, and when a negative voltage is output from the secondary windings of the first and second transformers, the current gradually decreases with the negative voltage. Similarly, the second and fourth inductors are used so that when a negative voltage is output from the secondary windings of the first and second transformers, the current gradually increases with the negative voltage, and when a positive voltage is output from the secondary windings of the first and second transformers, the current gradually decreases with the positive voltage. Based on this, the target voltage can be output through the first, second, third, and fourth inductors.

[0016] When the voltage of the second transformer rises abnormally, the first inductor, in conjunction with the second inductor, limits the voltage across the third and fourth inductors to ensure the transformer module outputs a fixed voltage value; or, when the voltage of the first transformer rises abnormally, the fourth inductor, in conjunction with the fourth inductor, limits the voltage across the first and second inductors to ensure the transformer module outputs a fixed voltage value. Based on this, voltage oscillations across the windings of the two transformers when using four independent inductors can be eliminated by limiting the transformer voltage. Attached Figure Description

[0017] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0018] Figure 1 This is a structural block diagram of a low-voltage system provided in an embodiment of the present invention;

[0019] Figure 2a This is a circuit diagram of the fifth and eighth switching transistors after they are turned on in a low-voltage, high-power adjustable power supply provided in this embodiment of the utility model.

[0020] Figure 2b This is a circuit diagram of the sixth and seventh switching transistors after they are turned on in a low-voltage, high-power adjustable power supply provided in this embodiment of the utility model.

[0021] Figure 3This is a structural block diagram of a magnetic integrated device provided in an embodiment of the present invention. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0023] The technical features involved in the various embodiments of this application described below do not conflict with each other and can be combined with each other.

[0024] When an element is described as "connected" to another element, it can be directly connected to the other element, or there may be one or more intervening elements between them.

[0025] The terms "first," "second," etc., used in the specification and claims of this utility model are used to distinguish similar objects and are not used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, the first object can be one or more.

[0026] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0027] Please see Figure 1 , Figure 1 This is a structural block diagram of a low-voltage system provided in an embodiment of this utility model, as shown below. Figure 1 As shown, the low-voltage system 100 includes a controller 10 and a low-voltage high-power adjustable power supply 20. The controller 10 is connected to the low-voltage high-power adjustable power supply 20. The controller 10 is used to control the operating state of the low-voltage high-power adjustable power supply 20 so that the low-voltage high-power adjustable power supply 20 outputs the target voltage.

[0028] In some embodiments, the low-voltage system 100 further includes a bus capacitor (not shown), which is connected to a low-voltage high-power adjustable power supply 20. The bus capacitor is used to store high voltage, and the low-voltage high-power adjustable power supply 20 is used to receive the bus voltage output by the bus capacitor and process the bus voltage based on the drive signal of the controller 10, thereby outputting a target voltage.

[0029] In yet another embodiment, such as Figure 1 As shown, the low-voltage high-power adjustable power supply 20 includes a phase-shifting full-bridge circuit 21, a transformer module 22, a filter module 23, and a magnetic integrated device 24.

[0030] The transformer module 22 includes a first transformer T1 and a second transformer T2. The winding structure and turns ratio of the first transformer T1 are the same as those of the second transformer T2. The primary windings of the first transformer T1 and the second transformer T2 are connected in series. The primary windings of the first transformer T1 and the second transformer T2 are also connected to the phase-shifting full-bridge circuit 21. The secondary windings of the first transformer T1 and the second transformer T2 are connected in parallel and connected to the magnetic integrated device 24. The phase-shifting full-bridge circuit 21 is used to receive the bus voltage. The magnetic integrated device 24 is also connected to the filter module 23. The phase-shifting full-bridge circuit 21 is also used to connect to the controller 10.

[0031] The phase-shifting full-bridge circuit 21 is used to receive the drive signal output by the controller 10 and convert the bus voltage based on the drive signal to output the corresponding voltage signal to the transformer module 22.

[0032] The transformer module 22 is used to divide the voltage signal after receiving the voltage signal, and convert the divided voltage signal based on the corresponding turns ratio to output a preset voltage to the magnetic integrated device 24.

[0033] The magnetic integrated device 24 is used to output the preset voltage to the filter module 23 after receiving the preset voltage, so as to output the target voltage based on the filter module 23.

[0034] It should be noted that the winding structure includes the number of turns and winding method of the transformer coil. The winding structure and turns ratio of the first transformer T1 are set to be the same as those of the second transformer T2. This ensures that when the voltage of the primary winding of the first transformer T1 is the same as that of the primary winding of the second transformer T2, the voltage of the secondary winding of the first transformer T1 is also the same as that of the secondary winding of the second transformer T2.

[0035] Specifically, the phase-shifting full-bridge circuit 21 is also connected to the bus capacitor. When the phase-shifting full-bridge circuit 21 receives the drive signal output by the controller 10, it converts the bus voltage output by the bus capacitor based on the drive signal, thereby outputting a voltage signal to the primary windings of the first transformer T1 and the second transformer T2. Since the primary windings of the first transformer T1 and the second transformer T2 are connected in series, and the winding structures and turns ratios of the first transformer T1 and the second transformer T2 are the same, the primary side of the first transformer T1 and the primary side of the second transformer T2 jointly divide the voltage signal, and the voltages divided on the primary side of the first transformer T1 and the primary side of the second transformer T2 are the same. Based on the same turns ratio of the transformers, the preset voltage output by the first transformer T1 is the same as the preset voltage output by the second transformer T2. After the first transformer T1 and the second transformer T2 output the preset voltage respectively, the magnetic integrated device 24 processes the preset voltage based on the control signal output by the controller 10, thereby outputting the target voltage based on the filter module 23.

[0036] It should be noted that by connecting the primary winding of the first transformer T1 in series with the primary winding of the second transformer T2, and connecting the secondary windings of the first transformer T1 and the second transformer T2 in parallel, the power transmission capacity of the power supply is increased while ensuring that the current in the primary windings of the first transformer T1 and the second transformer T2 is the same.

[0037] In yet another embodiment, please refer to Figures 2a-2b , Figure 2a This is a circuit diagram of the fifth and eighth switching transistors after they are turned on in a low-voltage, high-power adjustable power supply provided by an embodiment of this utility model. Figure 2b This is a circuit diagram showing the sixth and seventh switching transistors after they are turned on in a low-voltage, high-power adjustable power supply provided in this embodiment of the utility model. Figures 2a-2b As shown, the corresponding terminal (A) of the primary winding of the first transformer T1 is located in the first position of the first transformer T1, and the corresponding terminal (B) of the primary winding of the second transformer T2 is located in the first position of the second transformer T2.

[0038] The corresponding terminal (a) of the secondary winding of the first transformer T1 is located in the second position of the first transformer T1, and the corresponding terminal (b) of the secondary winding of the second transformer T2 is located in the second position of the second transformer T2.

[0039] It should be noted that by setting the same terminal of the first transformer T1 and the same terminal of the second transformer T2 at the same position of the corresponding transformers, the current in the secondary winding of the first transformer T1 and the secondary winding of the second transformer T2 can be made equal according to the same turns ratio of the transformers, thereby achieving current sharing between the two transformers.

[0040] In some embodiments, such as Figures 2a-2b As shown, the phase-shifted full-bridge circuit 21 includes a fifth switch Q1, a sixth switch Q2, a seventh switch Q3, an eighth switch Q4, diodes D1, D2, D3, and D4, capacitors C1, C2, C3, and C4, and an inductor Lr. Diodes D1, D2, D3, and D4 are the body diodes corresponding to the switches. Capacitors C1, C2, C3, and C4 are the sum of the parasitic capacitances corresponding to the switches and the external parallel capacitances. The inductor Lr is the sum of the leakage inductance of the first transformer T1 and the second transformer T2, and the external inductance.

[0041] Specifically, such as Figure 2a As shown, when the bus capacitance (C) in When the controller 10 outputs a drive signal to the fifth switch Q1 and the eighth switch Q4, the fifth switch Q1 and the eighth switch Q4 are turned on. At this time, the bus voltage flows through the fifth switch Q1 into the primary winding of the first transformer T1 and the primary winding of the second transformer T2, and then into the ground terminal (the negative terminal of the bus capacitor) through the eighth switch Q4. Since the winding structure and turns ratio of the first transformer T1 and the second transformer T2 are the same, the voltage on the primary winding of the first transformer T1 and the primary winding of the second transformer T2 is the same.

[0042] It is known that, as Figure 2a As shown, based on the positions of the corresponding terminals of the first transformer T1 and the second transformer T2, when the fifth switch Q1 and the eighth switch Q4 are turned on, the corresponding terminals of the primary windings of the first transformer T1 and the second transformer T2 are both positive voltages. Therefore, the corresponding terminals of the secondary windings of the first transformer T1 and the second transformer T2 are also positive voltages, and the voltage of the secondary winding of the first transformer T1 is the same as the voltage of the secondary winding of the second transformer T2.

[0043] In some embodiments, such as Figure 2b As shown, when the bus capacitor outputs the bus voltage and the controller 10 outputs a drive signal to the control terminals of the sixth switch Q2 and the seventh switch Q3, the sixth switch Q2 and the seventh switch Q3 are turned on. The bus voltage flows into the second transformer T2 through the sixth switch Q2, then into the first transformer T1 from the second transformer T2, and finally into the ground terminal via the seventh switch Q3. At this time, the voltages at the primary winding terminals of the first transformer T1, the secondary winding terminals of the first transformer T1, the primary winding terminals of the second transformer T2, and the secondary winding terminals of the second transformer T2 are all negative voltages.

[0044] It should be noted that the controller 10 employs a finite bipolar control method when outputting the drive signal. In this application, a 50% duty cycle drive signal is used to drive the lower transistors, that is, the duty cycle of the drive signals for the seventh switch Q3 and the eighth switch Q4 is set to 50%, thereby causing the seventh switch Q3 and the eighth switch Q4 to conduct alternately with consistent conduction times. This achieves the purpose of adjusting the output voltage by regulating the pulse width of the drive signals for the fifth switch Q1 and the sixth switch Q2. By setting the duty cycle of the drive signals for the seventh switch Q3 and the eighth switch Q4 to 50%, the reliability of the power supply to the upper transistor drive circuit can be guaranteed. It is understood that the phase-shifted full-bridge circuit 21 mainly achieves positive and negative voltage output by controlling the duty cycle of the upper transistor drive signal; therefore, the output voltage can be adjusted by regulating the duty cycle of the upper transistor drive signal.

[0045] In another embodiment, the phase-shifted full-bridge circuit 21 can also be implemented in other ways based on the output of positive or negative voltage from the first transformer T1 and the second transformer T2, such as through a body diode or parasitic capacitance. The principle is similar to that of the above-mentioned implementation through a switching transistor, and will not be described again here.

[0046] In another embodiment, please refer to Figure 3 , Figure 3 This is a structural block diagram of a magnetic integrated device provided in an embodiment of the present invention, as shown below. Figure 3 As shown, the magnetic integrated device 24 includes a first inductor L1, a second inductor L2, a third inductor L3, and a fourth inductor L4. The first inductor L1 is connected to the same-name terminal of the secondary winding of the first transformer T1, the second inductor L2 is connected to the non-same-name terminal of the secondary winding of the first transformer T1, the third inductor L3 is connected to the same-name terminal of the secondary winding of the second transformer T2, and the fourth inductor L4 is connected to the non-same-name terminal of the secondary winding of the second transformer T2. The first inductor L1 is also connected to the third inductor L3, and the second inductor L2 is also connected to the fourth inductor L4.

[0047] The first inductor L1 is used so that when the secondary winding of the first transformer T1 outputs a positive voltage, the current gradually increases with the positive voltage, and when the secondary winding of the first transformer T1 outputs a negative voltage, the current gradually decreases with the negative voltage; and

[0048] When the voltage of the second transformer T2 rises abnormally, the voltage across the third inductor L3 and the fourth inductor L4 is limited by the second inductor L2 so that the transformer module 22 outputs a fixed voltage value.

[0049] The second inductor L2 is used so that when the secondary winding of the first transformer T1 outputs a negative voltage, the current gradually increases with the negative voltage, and when the secondary winding of the first transformer T1 outputs a positive voltage, the current gradually decreases with the positive voltage.

[0050] The third inductor L3 is used so that when the secondary winding of the second transformer T2 outputs a positive voltage, the current gradually increases with the positive voltage, and when the secondary winding of the second transformer T2 outputs a negative voltage, the current gradually decreases with the negative voltage; and

[0051] When the voltage of the first transformer T1 rises abnormally, the voltage across the first inductor L1 and the second inductor L2 is limited by the fourth inductor L4 so that the transformer module 22 outputs a fixed voltage value.

[0052] The fourth inductor L4 is used so that when the secondary winding of the second transformer T2 outputs a negative voltage, the current gradually increases with the negative voltage, and when the secondary winding of the second transformer T2 outputs a positive voltage, the current gradually decreases with the positive voltage.

[0053] Specifically, when the first transformer T1 and the second transformer T2 output positive voltages, these positive voltages are applied to the corresponding first inductor L1 and third inductor L3, causing the current in the first inductor L1 and third inductor L3 to gradually increase. At this time, since no voltage is applied to the second inductor L2 and fourth inductor L4, the current in the second inductor L2 and fourth inductor L4 will gradually decrease. Conversely, when the first transformer T1 and the second transformer T2 output negative voltages, these negative voltages are applied to the second inductor L2 and fourth inductor L4, causing the voltage in the second inductor L2 and fourth inductor L4 to gradually increase. At this time, the current in the first inductor L1 and third inductor L3 will gradually decrease. Based on this, the target voltage can be output in real time through the first inductor L1, second inductor L2, third inductor L3, and fourth inductor L4.

[0054] It should be noted that when the first transformer T1 and the second transformer T2 output positive voltages, the first transformer T1 may resonate with the first inductor L1, the second inductor L2, the third inductor L3, and the fourth inductor L4, causing the voltage on the first transformer T1 to rise, which in turn increases the voltage between the first inductor L1 and the second inductor L2. Since the first inductor L1 is connected to the third inductor L3, and the second inductor L2 is connected to the fourth inductor L4, the voltage between the third inductor L3 and the fourth inductor L4 will also rise, thus causing the secondary winding voltage of the second transformer T2 to rise. However, since the turns ratio and winding structure of the first transformer T1 and the second transformer T2 are the same, and the primary voltage of the first transformer T1 is the same as that of the second transformer T2 and both are fixed voltages, the secondary voltage of the first transformer T1 and the secondary voltage of the second transformer T2 are also the same fixed voltages, resulting in the output voltage of the transformer module 22 being a fixed voltage. Based on this, when the voltage of the secondary winding of the first transformer T1 increases due to resonance, the voltage of the secondary winding of the second transformer T2 will also increase, thereby increasing the output voltage of the transformer module 22. However, the output voltage of the transformer module 22 is a fixed voltage, which limits the voltage increase of the secondary winding of the first transformer T1 or the secondary winding of the second transformer T2, thereby eliminating the voltage oscillation at both ends of the first transformer T1.

[0055] In some embodiments, the method for eliminating voltage oscillations across the second transformer T2 is the same as the method for eliminating voltage oscillations across the first transformer T1 described above, and will not be repeated here.

[0056] In some embodiments, such as Figures 2a-2b The first inductor L1, the second inductor L2, the third inductor L3 and the fourth inductor L4 each include a main winding and an auxiliary winding that are coupled to each other.

[0057] The same-name terminal of the main winding N1 of the first inductor L1 is connected to the same-name terminal of the secondary winding of the first transformer T1. The same-name terminal of the main winding N2 of the second inductor L2 is connected to the non-same-name terminal of the secondary winding of the first transformer T1. The same-name terminal of the main winding N3 of the third inductor L3 is connected to the same-name terminal of the secondary winding of the second transformer T2. The same-name terminal of the main winding N4 of the fourth inductor L4 is connected to the non-same-name terminal of the secondary winding of the second transformer T2. The same-name terminal of the auxiliary winding n1 of the first inductor L1 is connected to the same-name terminal of the auxiliary winding n3 of the third inductor L3. The same-name terminal of the auxiliary winding n2 of the second inductor L2 is connected to the same-name terminal of the auxiliary winding n4 of the fourth inductor L4.

[0058] It should be noted that when the first inductor L1 and the third inductor L3 begin to operate based on the positive voltage output from the first transformer T1 and the second transformer T2, the current in the main winding N1 of the first inductor L1 and the main winding N3 of the third inductor L3 slowly increases. At this time, if the first transformer T1 resonates with the first inductor L1 and / or the second inductor L2 and / or the third inductor L3 and / or the fourth inductor L4, the voltage on the first transformer T1 will increase, thereby increasing the voltage between the main winding N1 of the first inductor L1 and the main winding N2 of the second inductor L2. Based on the principle of corresponding terminals, when the voltage between the main windings N1 and N2 increases, the voltage between the auxiliary windings n1 and n2 also increases. Since auxiliary windings n1 and n3 are connected, and auxiliary windings n2 and n4 are connected, the voltage between auxiliary windings n3 and n4 also increases. This, in turn, increases the voltage between the main windings N3 and N4 of the third inductor L3 and the fourth inductor L4, ultimately leading to a voltage increase on the second transformer T2. Because the total voltage between the first transformer T1 and the second transformer T2 is a fixed value, abnormal voltage increases in both transformers are limited, thus eliminating voltage oscillations across the transformers.

[0059] In some other embodiments, such as Figure 3 As shown, the magnetic integrated device 24 also includes a switch module 241, which is connected to the first transformer T1 and the second transformer T2 respectively. The switch module 241 is also connected to the first inductor L1, the second inductor L2, the third inductor L3 and the fourth inductor L4 respectively. The switch module 241 is also used to receive control signals.

[0060] The switching module 241 is used to, upon receiving a control signal, apply the positive voltage output from the secondary windings of the first transformer T1 and the second transformer T2 to the first inductor L1 and the second inductor L2, so that the current flowing through the first inductor L1 and the second inductor L2 gradually increases under the action of the positive voltage; and in response to the negative voltage output from the secondary windings of the first transformer T1 and the second transformer T2, apply the negative voltage to the third inductor L3 and the fourth inductor L4, so that the current flowing through the third inductor L3 and the fourth inductor L4 gradually increases under the action of the negative voltage, so that the current is output to the filter module 23 through the third inductor L3 and the fourth inductor L4.

[0061] Specifically, when the corresponding terminals of the secondary windings of the first transformer T1 and the second transformer T2 output positive voltage, the switching module 241 also receives the control signal output by the controller 10, and inputs the positive voltage into the first inductor L1 and the third inductor L3 based on the control signal, so that the current in the first inductor L1 and the third inductor L3 gradually increases. After the current flows through the first inductor L1 and the third inductor L3, it is output to the filter module 23, thereby causing the filter module 23 to output the target voltage. When the secondary windings of the first transformer T1 and the second transformer T2 output negative voltage, that is, after the non-corresponding terminals of the secondary windings of the first transformer T1 and the second transformer T2 output positive voltage, the controller 10 outputs a control signal to the switching module 241, thereby causing the current in the second inductor L2 and the fourth inductor L4 to gradually increase, and then outputting the current to the filter module 23 through the second inductor L2 and the fourth inductor L4.

[0062] In some embodiments, the switching module 241 is used to control the current on the first inductor L1 and the third inductor L3 to increase by a preset increment and the current on the second inductor L2 and the fourth inductor L4 to decrease by a preset decrease based on the positive voltage output from the corresponding terminals of the secondary windings of the first transformer T1 and the second transformer T2; and to control the current on the first inductor L1 and the third inductor L3 to decrease by a preset decrease and the current on the second inductor L2 and the fourth inductor L4 to increase by a preset increment based on the negative voltage output from the secondary windings of the first transformer T1 and the second transformer T2 (i.e., the positive voltage output from the non-corresponding terminals).

[0063] It should be noted that the corresponding terminals of the secondary windings of the first transformer T1 and the second transformer T2 will alternately output positive and negative voltages. When a corresponding terminal outputs a positive voltage, a non-corresponding terminal will output a negative voltage, and vice versa. Therefore, when a positive voltage is output from the corresponding terminals of the secondary windings of the first transformer T1 and the second transformer T2, since the current in the inductors cannot change abruptly, the current flowing through the first inductor L1 and the third inductor L3 gradually increases under the influence of the positive voltage, while the current flowing through the second inductor L2 and the fourth inductor L4 gradually decreases. Conversely, when a positive voltage is output from the non-corresponding terminals of the secondary windings of the first transformer T1 and the second transformer T2, the current in the first inductor L1 and the third inductor L3 gradually decreases, while the current in the second inductor L2 and the fourth inductor L4 gradually increases. Based on this, the output voltage of the filter module 23 can be made to be the target voltage by using the first inductor L1, the second inductor L2, the third inductor L3, and the fourth inductor L4.

[0064] In some embodiments, the turns ratio of the first inductor L1, the turns ratio of the second inductor L2, the turns ratio of the third inductor L3, and the turns ratio of the fourth inductor L4 are the same.

[0065] In another embodiment, such as Figures 2a-2b As shown, the filter module 23 is a capacitor Co, which is connected to the first inductor L1, the second inductor L2, the third inductor L3, and the fourth inductor L4, respectively. The capacitor Co is also used for grounding. Specifically, the capacitor Co is used to receive the voltage signals output by the first inductor L1 and / or the second inductor L2, the third inductor L3, and / or the fourth inductor L4.

[0066] In some embodiments, such as Figures 2a-2b As shown, the switch module 241 includes a first switch Q5, a second switch Q6, a third switch Q7, and a fourth switch Q8;

[0067] The first terminal of the first switch Q5 is connected to the same-name terminal of the secondary winding of the first transformer T1 and the first inductor L1, respectively. The second terminal of the first switch Q5 is connected to the first terminal of the second switch Q6. The second terminal of the first switch Q5 is also connected to the filter module 23. The second terminal of the second switch Q6 is connected to the non-same-name terminal of the secondary winding of the first transformer T1 and the second inductor L2, respectively. The first terminal of the third switch Q7 is connected to the same-name terminal of the secondary winding of the second transformer T2 and the third inductor L3, respectively. The second terminal of the third switch Q7 is connected to the first terminal of the fourth switch Q8. The second terminal of the third switch Q7 is also connected to the filter module 23. The second terminal of the fourth switch Q8 is connected to the fourth inductor L4 and the non-same-name terminal of the secondary winding of the second transformer T2, respectively. The first switch Q5, the second switch Q6, the third switch Q7 and the fourth switch Q8 are also connected to the controller 10.

[0068] The first switch Q5, the second switch Q6, the third switch Q7, and the fourth switch Q8 are all used to receive the control signal output by the controller 10, and are turned on alternately according to the control signal. The first switch Q5 and the third switch Q7 have the same on / off state, the second switch Q6 and the fourth switch Q8 have the same on / off state, and the first switch Q5 and the second switch Q6 are turned on alternately.

[0069] Specifically, such as Figure 2aAs shown, when the same-name terminals of the secondary windings of the first transformer T1 and the second transformer T2 output positive voltage, the second switch Q6 and the fourth switch Q8 will also receive control signals and turn on based on the control signals. After the same-name terminal of the secondary winding of the first transformer T1 outputs positive voltage, the positive voltage will be input to the positive terminal of capacitor Co through the same-name terminal of the first transformer T1 and the main winding N1 of the first inductor L1, and then return to the non-same-name terminal of the first transformer T1 through the negative terminal of capacitor Co and the second switch Q6; at the same time, the positive voltage of the same-name terminal of the secondary winding of the second transformer T2 will also flow into the main winding N3 of the third inductor L3 through the same-name terminal of the second transformer T2, and be input to the positive terminal of capacitor Co through the third inductor L3, and then flow back to the non-same-name terminal of the second transformer T2 through capacitor Co and the fourth switch Q8.

[0070] In some embodiments, such as Figure 2b As shown, when a positive voltage is output from the non-same-name terminals of the secondary windings of the first transformer T1 and the second transformer T2, the first switch Q5 and the third switch Q7 will also receive a control signal and turn on based on the control signal. At this time, the positive voltage will return to the same-name terminal of the first transformer T1 through the non-same-name terminal of the first transformer T1, the main winding N2 of the second inductor L2, the capacitor Co, and the first switch Q5; at the same time, the positive voltage output from the non-same-name terminal of the second transformer T2 will flow back to the same-name terminal of the second transformer T2 through the main winding N4 of the fourth inductor L4, the capacitor Co, and the third switch Q7. Based on this, positive and negative voltages can be output to the filter module 23 when the secondary windings of the first transformer T1 and the second transformer T2 output positive and negative voltages, thereby enabling the low-voltage high-power adjustable power supply to output the target voltage in real time.

[0071] In another embodiment, such as Figures 2a-2b The magnetic integrated device 241 also includes a first capacitor C5 and a second capacitor C6;

[0072] The first capacitor C5 is connected to the non-same-name terminal of the auxiliary winding n1 of the first inductor L1 and the non-same-name terminal of the auxiliary winding n3 of the third inductor L3, respectively. The second capacitor C6 is connected to the non-same-name terminal of the auxiliary winding n2 of the second inductor L2 and the non-same-name terminal of the auxiliary winding n4 of the fourth inductor L4, respectively.

[0073] It should be noted that inductors have the function of passing DC and blocking AC. That is, after the first transformer T1 and the second transformer T2 output voltage, this voltage, after being processed by the switching module 23, results in DC current flowing into the main windings N1 of the first inductor L1, N2 of the second inductor L2, N3 of the third inductor L3, and N4 of the fourth inductor L4. Based on the principle of same-name terminals, the current in the auxiliary windings n1, n2, n3, and n4 is also DC. Since capacitors have the function of passing AC and blocking DC, the auxiliary windings n1 and n3, and n2 and n4 will not form a circuit. Therefore, the auxiliary windings n1, n2, n3, and n4 are only used to limit the abnormal voltage rise of the first transformer T1 or the second transformer T2.

[0074] This invention provides a magnetic integrated device, a low-voltage high-power adjustable power supply, and a low-voltage system. The device includes a first inductor, a second inductor, a third inductor, and a fourth inductor. The first inductor is connected to the same-name terminal of the secondary winding of a first transformer, the second inductor is connected to the non-same-name terminal of the secondary winding of the first transformer, the third inductor is connected to the same-name terminal of the secondary winding of the second transformer, and the fourth inductor is connected to the non-same-name terminal of the secondary winding of the second transformer. The first inductor is also connected to the third inductor, and the second inductor is also connected to the fourth inductor. When the secondary windings of the first and second transformers output a positive voltage, the current gradually increases with the positive voltage, and when the secondary windings of the first and second transformers output a negative voltage, the current gradually decreases with the negative voltage. Similarly, when the secondary windings of the first and second transformers output a negative voltage, the current gradually increases with the negative voltage, and when the secondary windings of the first and second transformers output a positive voltage, the current gradually decreases with the positive voltage. Based on this, the target voltage can be output through the first inductor, the second inductor, the third inductor, and the fourth inductor.

[0075] When the voltage of the second transformer rises abnormally, the first inductor, in conjunction with the second inductor, limits the voltage across the third and fourth inductors to ensure the transformer module outputs a fixed voltage value; or, when the voltage of the first transformer rises abnormally, the third inductor, in conjunction with the fourth inductor, limits the voltage across the first and second inductors to ensure the transformer module outputs a fixed voltage value. Based on this, voltage oscillations across the windings of the two transformers when using four independent inductors can be eliminated by limiting the transformer voltage.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; under the concept of this utility model, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of this utility model as described above, which are not provided in detail for the sake of brevity; although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A magnetic integrated device, characterized in that, This invention relates to a low-voltage, high-power adjustable power supply. The low-voltage, high-power adjustable power supply includes a transformer module, which includes a first transformer and a second transformer. The transformer module is configured to output a fixed voltage value. The magnetic integrated device includes a first inductor, a second inductor, a third inductor, and a fourth inductor. The first inductor is connected to the same-name terminal of the secondary winding of the first transformer. The second inductor is connected to a non-same-name terminal of the secondary winding of the first transformer. The third inductor is connected to the same-name terminal of the secondary winding of the second transformer. The fourth inductor is connected to a non-same-name terminal of the secondary winding of the second transformer. The first inductor is also connected to the third inductor, and the second inductor is also connected to the fourth inductor. The first inductor is used to gradually increase the current as the positive voltage is output from the secondary winding of the first transformer, and to gradually decrease the current as the negative voltage is output from the secondary winding of the first transformer; the first inductor, together with the second inductor, limits the voltage across the third and fourth inductors; The second inductor is used so that when the secondary winding of the first transformer outputs a negative voltage, the current gradually increases with the negative voltage, and when the secondary winding of the first transformer outputs a positive voltage, the current gradually decreases with the positive voltage. The third inductor is used to gradually increase the current when the secondary winding of the second transformer outputs a positive voltage, and to gradually decrease the current when the secondary winding of the second transformer outputs a negative voltage; the third inductor, in conjunction with the fourth inductor, limits the voltage across the first and second inductors. The fourth inductor is used so that when the secondary winding of the second transformer outputs a negative voltage, the current gradually increases with the negative voltage, and when the secondary winding of the second transformer outputs a positive voltage, the current gradually decreases with the positive voltage.

2. The magnetic integrated device according to claim 1, characterized in that, The first inductor, the second inductor, the third inductor, and the fourth inductor all include mutually coupled main windings and auxiliary windings; The same-name terminal of the primary winding of the first inductor is used to connect with the same-name terminal of the secondary winding of the first transformer; the same-name terminal of the primary winding of the second inductor is used to connect with the non-same-name terminal of the secondary winding of the first transformer; the same-name terminal of the primary winding of the third inductor is used to connect with the same-name terminal of the secondary winding of the second transformer; the same-name terminal of the primary winding of the fourth inductor is used to connect with the non-same-name terminal of the secondary winding of the second transformer; the same-name terminal of the auxiliary winding of the first inductor is connected with the same-name terminal of the auxiliary winding of the third inductor; and the same-name terminal of the auxiliary winding of the second inductor is connected with the same-name terminal of the auxiliary winding of the fourth inductor.

3. The magnetic integrated device according to claim 2, characterized in that, The magnetic integrated device also includes a first capacitor and a second capacitor. The first capacitor is connected to the non-same-name terminal of the auxiliary winding of the first inductor and the non-same-name terminal of the auxiliary winding of the third inductor, respectively. The second capacitor is connected to the non-same-name terminal of the auxiliary winding of the second inductor and the non-same-name terminal of the auxiliary winding of the fourth inductor, respectively.

4. The magnetic integrated device according to claim 1, characterized in that, The magnetic integrated device also includes a switching module; The switch module is connected to the secondary winding of the first transformer and the secondary winding of the second transformer respectively. The switch module is also connected to the first inductor, the second inductor, the third inductor and the fourth inductor respectively. The switch module is also used to receive control signals. The switching module is used to apply the positive voltage output from the secondary windings of the first transformer and the second transformer to the first inductor and the third inductor after receiving the control signal, so that the current flowing through the first inductor and the third inductor gradually increases under the action of the positive voltage. And according to the control signal, the negative voltage output from the secondary winding of the first transformer and the secondary winding of the second transformer is applied to the second inductor and the fourth inductor, so that the current flowing through the second inductor and the fourth inductor gradually increases under the action of the negative voltage.

5. The magnetic integrated device according to claim 4, characterized in that, The switching module is used to control the current on the first inductor and the current on the third inductor to increase by a preset increment and the current on the second inductor and the current on the fourth inductor to decrease by a preset amount when the positive voltage is output by the secondary winding of the first transformer and the secondary winding of the second transformer. And when the secondary windings of the first transformer and the second transformer output negative voltage, the current on the first inductor and the current on the third inductor are controlled to decrease by a preset amount, while the current on the second inductor and the current on the fourth inductor are increased by a preset amount.

6. The magnetic integrated device according to claim 4 or 5, characterized in that, The low-voltage high-power adjustable power supply also includes a filter module, which is connected to the first inductor, the second inductor, the third inductor and the fourth inductor. The switching module includes a first switching transistor, a second switching transistor, a third switching transistor and a fourth switching transistor. The first terminal of the first switch is connected to the same-name terminal of the secondary winding of the first transformer and the first inductor, respectively. The second terminal of the first switch is connected to the first terminal of the second switch and is also connected to the filter module. The second terminal of the second switch is connected to the non-same-name terminal of the secondary winding of the first transformer and the second inductor, respectively. The first terminal of the third switch is connected to the same-name terminal of the secondary winding of the second transformer and the third inductor, respectively. The second terminal of the third switch is connected to the first terminal of the fourth switch and is also connected to the filter module. The second terminal of the fourth switch is connected to the fourth inductor and the non-same-name terminal of the secondary winding of the second transformer, respectively. The first, second, third, and fourth switches are all connected to the controller. The first switch, the second switch, the third switch, and the fourth switch are all used to receive the control signal output by the controller and alternately turn on according to the control signal. The first switch and the third switch have the same on / off state, the second switch and the fourth switch have the same on / off state, and the first switch and the second switch alternately turn on.

7. The magnetic integrated device according to any one of claims 1-5, characterized in that, The turns ratios of the first inductor, the second inductor, the third inductor, and the fourth inductor are all the same.

8. A low-voltage, high-power adjustable power supply, characterized in that, The low-voltage high-power adjustable power supply includes a phase-shifting full-bridge circuit, a transformer module, a filter module, and a magnetic integrated device as described in any one of claims 1-7. The transformer module includes a first transformer and a second transformer. The winding structure and turns ratio of the first transformer are the same as those of the second transformer. The primary windings of the first transformer and the second transformer are connected in series. The primary windings of the first transformer and the second transformer are also connected to the phase-shifting full-bridge circuit. The secondary windings of the first transformer and the second transformer are connected in parallel and connected to the magnetic integrated device. The phase-shifting full-bridge circuit is used to receive the bus voltage. The magnetic integrated device is also connected to the filter module. The phase-shifting full-bridge circuit is also used to connect to the controller. The phase-shifting full-bridge circuit is used to receive the drive signal output by the controller, and convert the bus voltage based on the drive signal to output the corresponding voltage signal to the transformer module. The transformer module is used to divide the voltage signal after receiving the voltage signal, and convert the divided voltage signal based on the corresponding turns ratio to output a preset voltage to the magnetic integrated device. The magnetic integrated device is used to output the preset voltage to the filter module after receiving the preset voltage, so as to output the target voltage based on the filter module.

9. The low-voltage, high-power adjustable power supply according to claim 8, characterized in that, The corresponding terminal of the primary winding of the first transformer is located at the first position of the first transformer, and the corresponding terminal of the primary winding of the second transformer is located at the first position of the second transformer; The corresponding terminal of the secondary winding of the first transformer is located at the second position of the first transformer, and the corresponding terminal of the secondary winding of the second transformer is located at the second position of the second transformer.

10. A low-voltage system, characterized in that, The low-voltage system includes: The controller; and the low-voltage, high-power adjustable power supply as described in any one of claims 8-9.

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