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

Abstract

The invention 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] The invention relates to the field of high-frequency switching power supplies, and in particular to a magnetic integration device, a low-voltage high-power adjustable power supply and a low-voltage system. Background Art

[0002] In the application of high-power, low-voltage, full-range voltage regulation and high-current output power supply, the voltage drop of the secondary line has a significant impact on efficiency. High current puts higher requirements on the manufacturing process of the transformer, is also a challenge for the cooling of the transformer, and has higher requirements on the current rating of the rectifier diode or synchronous rectifier MOS tube. The current doubler rectifier circuit is evolved from the full-bridge rectifier circuit. The switch tube of one bridge arm in the full-bridge rectifier circuit is replaced by an inductor to transform it into a current doubler rectifier circuit. In the current doubler rectifier circuit, only one winding is needed for the secondary of the transformer. Compared with the full-wave rectifier circuit, which requires a winding with a center tap on the secondary, the current doubler rectifier circuit reduces the manufacturing difficulty of the transformer. The number of switching devices in the current doubler rectifier circuit is half of that in the full-bridge rectifier circuit. Under the same output current, the current flowing through the secondary winding of the transformer in the current doubler rectifier circuit is half of that in the full-bridge rectifier circuit. The average current of the two filter inductors in the current doubler rectifier circuit is only half of the output current, which reduces the output current ripple under the same conditions.

[0003] Since the current-doubler rectifier circuit has two inductors, four inductors are required when the transformer primary winding is connected in series and the secondary winding is connected in parallel. The resonance between the discrete filter inductor and the transformer parasitic parameters can easily cause voltage oscillation across the transformer winding. Summary of the invention

[0004] The embodiments of the present invention provide a magnetic integrated device, a low-voltage high-power adjustable power supply and a low-voltage system, which are conducive to solving the technical problem that in the existing low-voltage system with two transformer primary windings connected in series and secondary windings connected in parallel, voltage oscillation occurs at both ends of the transformer windings due to resonance between discrete filter inductors and transformer parasitic parameters during current doubling rectification.

[0005] A technical solution adopted in an embodiment of the present invention is: providing a magnetic integration device, which is applied to a low-voltage high-power adjustable power supply, wherein the low-voltage high-power adjustable power supply comprises a transformer module, wherein the transformer module comprises a first transformer and a second transformer, wherein the transformer module is configured to output a fixed voltage value, wherein the magnetic integration device comprises a first inductor, a second inductor, a third inductor and a fourth inductor, wherein the first inductor is used to be connected to the same-name end of the secondary winding of the first transformer, the second inductor is used to be connected to the non-same-name end of the secondary winding of the first transformer, the third inductor is used to be connected to the same-name end of the secondary winding of the second transformer, the fourth inductor is used to be connected to the non-same-name end 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 with the positive voltage when the secondary winding of the first transformer outputs a positive voltage, and gradually decrease the current with the negative voltage when the secondary winding of the first transformer outputs a negative voltage; and When the voltage of the second transformer rises abnormally, the second inductor is combined to limit the voltage across the third inductor and the fourth inductor so that the transformer module outputs a fixed voltage value; the second inductor is used to gradually increase the current with the negative voltage when the secondary winding of the first transformer outputs a negative voltage, and gradually decrease the current with the positive voltage when the secondary winding of the first transformer outputs a positive voltage; the third inductor is used to gradually increase the current with the positive voltage when the secondary winding of the second transformer outputs a positive voltage, and gradually decrease the current with the negative voltage when the secondary winding of the second transformer outputs a negative voltage; and when the voltage of the first transformer rises abnormally, the fourth inductor is combined to limit the voltage across the first inductor and the second inductor so that the transformer module outputs a fixed voltage value; the fourth inductor is used to gradually increase the current with the negative voltage when the secondary winding of the second transformer outputs a negative voltage, and gradually decrease the current with the positive voltage when the secondary winding of the second transformer outputs a positive voltage.

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

[0007] In some embodiments, the magnetic integrated device also includes a first capacitor and a second capacitor, the first capacitor is respectively connected to the non-like-name end of the auxiliary winding of the first inductor and the non-like-name end of the auxiliary winding of the third inductor, and the second capacitor is respectively connected to the non-like-name end of the auxiliary winding of the second inductor and the non-like-name end of the auxiliary winding of the fourth inductor.

[0008] In some embodiments, the magnetic integration device also includes a switch module, which is respectively connected to the secondary winding of the first transformer and the secondary winding of the second transformer, and is also respectively connected to the first inductor, the second inductor, the third inductor and the fourth inductor, and is also used to receive a control signal; after receiving the control signal, the switch module is used to apply the positive voltage output by the secondary winding of the first transformer and the secondary winding of 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 according to the control signal, the negative voltage output by 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.

[0009] In some embodiments, the switch module is used to control the current on the first inductor and the current on the third inductor to increase according to a preset increment, and the current on the second inductor and the current on the fourth inductor to decrease according to a preset decrease amount when the secondary winding of the first transformer and the secondary winding of the second transformer output a positive voltage; and when the secondary winding of the first transformer and the secondary winding of the second transformer output a negative voltage, control the current on the first inductor and the current on the third inductor to decrease according to a preset decrease amount, and the current on the second inductor and the current on the fourth inductor to increase according to a preset increment.

[0010] In some embodiments, the low-voltage high-power adjustable power supply further includes a filter module, which is connected to the first inductor, the second inductor, the third inductor and the fourth inductor, and the switch module includes a first switch tube, a second switch tube, a third switch tube and a fourth switch tube; the first end of the first switch tube is respectively connected to the same-name end of the secondary winding of the first transformer and the first inductor, the second end of the first switch tube is connected to the first end of the second switch tube, the second end of the first switch tube is also connected to the filter module, the second end of the second switch tube is respectively connected to the non-same-name end of the secondary winding of the first transformer and the second inductor, the first end of the third switch tube is respectively connected to the same-name end of the secondary winding of the second transformer and the third inductor The first switch tube is connected to the first end of the second transformer secondary winding, the second end of the third switch tube is connected to the filter module, the second end of the fourth switch tube is respectively connected to the fourth inductor and the non-same-name end of the secondary winding of the second transformer, the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are also connected to the controller; the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are all used to receive the control signal output by the controller, and are alternately turned on according to the control signal, wherein the on-off state of the first switch tube is the same as that of the third switch tube, the on-off state of the second switch tube is the same as that of the fourth switch tube, and the first switch tube and the second switch tube are alternately turned on.

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

[0012] In order to solve the above technical problems, another technical solution adopted in the embodiment of the present invention is: to provide a low-voltage high-power adjustable power supply, the low-voltage high-power adjustable power supply includes a phase-shifted full-bridge circuit, a transformer module, a filter module and the above 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 the winding structure and turns ratio of the second transformer, the primary winding of the first transformer and the primary winding of the second transformer are connected in series with each other, the primary winding of the first transformer and the primary winding of the second transformer after the series connection are also respectively connected to the phase-shifted full-bridge circuit, and the secondary winding of the first transformer and the secondary winding of the second transformer are connected in parallel with each other. The phase-shifted full-bridge circuit is connected to the magnetic integrated device, the phase-shifted full-bridge circuit is used to receive the bus voltage, the magnetic integrated device is also connected to the filter module, and the phase-shifted full-bridge circuit is also used to connect to the controller; the phase-shifted 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.

[0013] In some embodiments, the same-name end of the primary winding of the first transformer is located at the first position of the first transformer, and the same-name end of the primary winding of the second transformer is located at the first position of the second transformer; the same-name end of the secondary winding of the first transformer is located at the second position of the first transformer, and the same-name end of the secondary winding of the second transformer is located at the second position of the second transformer.

[0014] Another technical solution adopted by the embodiment of the present invention is: to provide a low-voltage system, the low-voltage system comprising: a controller; and the low-voltage high-power adjustable power supply as above.

[0015] Different from the related art, the present 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 used to be connected to the same-name end of the secondary winding of the first transformer, the second inductor is used to be connected to the non-same-name end of the secondary winding of the first transformer, the third inductor is used to be connected to the same-name end of the secondary winding of the second transformer, the fourth inductor is used to be connected to the non-same-name end 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 and the third inductor are used to gradually increase the current with the positive voltage when the first transformer secondary winding and the second transformer secondary winding output a positive voltage, and gradually decrease the current with the negative voltage when the first transformer secondary winding and the second transformer secondary winding output a negative voltage; the second inductor and the fourth inductor are used to gradually increase the current with the negative voltage when the first transformer secondary winding and the second transformer secondary winding output a negative voltage, and gradually decrease the current with the positive voltage when the first transformer secondary winding and the second transformer secondary winding output a 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.

[0016] When the voltage of the second transformer rises abnormally, the first inductor combines with the second inductor to limit the voltage across the third inductor and the fourth inductor, so that the transformer module outputs a fixed voltage value; or when the voltage of the first transformer rises abnormally, the fourth inductor combines with the first inductor to limit the voltage across the first inductor and the second inductor, so that the transformer module outputs a fixed voltage value. Based on this, the voltage oscillation across the two transformer windings when four independent inductors are used can be eliminated by limiting the transformer voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] One or more embodiments are exemplarily described by corresponding drawings, which do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and the figures in the drawings do not constitute proportional limitations unless otherwise stated.

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

[0019] Figure 2a This is a circuit diagram after the fifth switch tube and the eighth switch tube in a low-voltage, high-power adjustable power supply provided by an embodiment of the present invention are turned on;

[0020] Figure 2b This is a circuit diagram after the sixth switch tube and the seventh switch tube in a low-voltage, high-power adjustable power supply provided by an embodiment of the present invention are turned on;

[0021] Figure 3 It is a structural block diagram of a magnetic integration device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

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

[0024] When an element is referred to as being “connected to” another element, it can be directly connected to the other element, or one or more intervening elements may be present therebetween.

[0025] The terms "first", "second", etc. in the specification and claims of the present invention are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of one type, 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 those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0027] See also Figure 1 , Figure 1 is a structural block diagram of a low voltage system provided by an embodiment of the present invention, such as 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 working state of the low voltage high power adjustable power supply 20 so that the low voltage high power adjustable power supply 20 outputs a target voltage.

[0028] In some embodiments, the low-voltage system 100 also includes a bus capacitor (not shown), which is connected to the low-voltage, high-power, adjustable power supply 20, wherein 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, Figure 1As shown, the low-voltage high-power adjustable power supply 20 includes a phase-shifted full-bridge circuit 21 , a transformer module 22 , a filter module 23 and a magnetic integration 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 winding of the first transformer T1 and the primary winding of the second transformer T2 are connected in series. The primary winding of the first transformer T1 and the primary winding of the second transformer T2 are also connected to the phase-shift full-bridge circuit 21 respectively. The secondary winding of the first transformer T1 and the secondary winding of the second transformer T2 are connected in parallel to each other and connected to the magnetic integration device 24. The phase-shift full-bridge circuit 21 is used to receive the bus voltage. The magnetic integration device 24 is also connected to the filter module 23. The phase-shift full-bridge circuit 21 is also used to connect to the controller 10.

[0031] The phase-shifted full-bridge circuit 21 is used to receive the driving signal output by the controller 10 , and convert the bus voltage based on the driving signal to output a 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 integration device 24 .

[0033] The magnetic integration device 24 is used for outputting 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 the winding method of the transformer coil, and the winding structure and turns ratio of the first transformer T1 are set to the same winding structure and turns ratio as the second transformer T2, so that when the primary side (primary winding end) voltage of the first transformer T1 is the same as the primary side voltage of the second transformer T2, the secondary side (secondary winding end) voltage of the first transformer T1 and the secondary side voltage of the second transformer T2 are also the same.

[0035] Specifically, the phase-shifted full-bridge circuit 21 is also connected to the bus capacitor. When the phase-shifted full-bridge circuit 21 receives the driving signal output by the controller 10, it converts the bus voltage output by the bus capacitor based on the driving signal, thereby outputting a voltage signal to the primary windings of the first transformer T1 and the second transformer T2. Since the primary winding of the first transformer T1 and the primary winding of the second transformer T2 are connected in series, and the winding structure and turn ratio 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; and based on the same turn 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 respectively output the preset voltages, the magnetic integration device 24 processes the preset voltages 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 winding of the first transformer T1 in parallel with the secondary winding of the second transformer T2, the transmission power of the power supply is increased while the current of the primary winding of the first transformer T1 and the primary winding of the second transformer T2 are made the same.

[0037] In yet another embodiment, see Figure 2a-2b , Figure 2a is a circuit diagram after the fifth switch tube and the eighth switch tube in a low-voltage high-power adjustable power supply provided by an embodiment of the present invention are turned on. Figure 2b 1 is a circuit diagram of a low-voltage, high-power adjustable power supply provided by an embodiment of the present invention after the sixth switch tube and the seventh switch tube are turned on. Figure 2a-2b As shown, the same-name end (A) of the primary winding of the first transformer T1 is located at the first position of the first transformer T1, and the same-name end (B) of the primary winding of the second transformer T2 is located at the first position of the second transformer T2.

[0038] The same-name end (a) of the secondary winding of the first transformer T1 is located at the second position of the first transformer T1, and the same-name end (b) of the secondary winding of the second transformer T2 is located at the second position of the second transformer T2.

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

[0040] In some embodiments, Figure 2a-2bAs shown, the phase-shifted full-bridge circuit 21 includes a fifth switch tube Q1, a sixth switch tube Q2, a seventh switch tube Q3, an eighth switch tube Q4, a diode D1, a diode D2, a diode D3, a diode D4, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4 and an inductor Lr. The diode D1, the diode D2, the diode D3 and the diode D4 are body diodes corresponding to the switch tubes, the capacitor C1, the capacitor C2, the capacitor C3 and the capacitor C4 are the sum of the parasitic capacitance corresponding to the switch tubes and the external parallel capacitance, and 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, Figure 2a As shown, when the bus capacitance (C in ) output voltage and the controller 10 outputs a driving signal to the fifth switch tube Q1 and the eighth switch tube Q4, the fifth switch tube Q1 and the eighth switch tube Q4 are turned on. At this time, the bus voltage will flow into the primary winding of the first transformer T1 and the primary winding of the second transformer T2 through the fifth switch tube Q1, and then flow into the ground terminal (the negative electrode of the bus capacitor) through the eighth switch tube Q4. Among them, since the winding structure and turn 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 are the same.

[0042] It is known that if Figure 2a As shown, according to the positions of the like-named ends of the first transformer T1 and the second transformer T2, when the fifth switch tube Q1 and the eighth switch tube Q4 are turned on, the like-named ends of the primary winding of the first transformer T1 and the like-named ends of the primary winding of the second transformer T2 are both positive voltages, so the like-named ends of the secondary winding of the first transformer T1 and the like-named ends of the secondary winding of 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, Figure 2b As shown, when the bus capacitor outputs the bus voltage and the controller 10 outputs a driving signal to the control end of the sixth switch tube Q2 and the seventh switch tube Q3, the sixth switch tube Q2 and the seventh switch tube Q3 are turned on, and the bus voltage flows into the second transformer T2 through the sixth switch tube Q2, and then flows into the first transformer T1 from the second transformer T2, and finally flows into the ground end based on the seventh switch tube Q3. At this time, the voltages of the primary winding same-name end of the first transformer T1, the secondary winding same-name end of the first transformer T1, the primary winding same-name end of the second transformer T2, and the secondary winding same-name end of the second transformer T2 are all negative voltages.

[0044] It should be noted that the controller 10 adopts a limited bipolar control method when outputting a driving signal. In the present application, a driving signal with a duty cycle of 50% is used to drive the lower tube, that is, the duty cycle of the driving signal of the seventh switch tube Q3 and the eighth switch tube Q4 is set to 50%, so that the seventh switch tube Q3 and the eighth switch tube Q4 are alternately turned on, and the turn-on time is consistent, thereby achieving the purpose of adjusting the output voltage by adjusting the pulse width of the driving signal of the fifth switch tube Q1 and the sixth switch tube Q2. Among them, by setting the duty cycle of the driving signal of the seventh switch tube Q3 and the eighth switch tube Q4 to 50%, the reliability of the power supply of the upper tube driving circuit can be guaranteed. It can be known that the phase-shifted full-bridge circuit 21 mainly realizes the output of positive and negative voltages by controlling the duty cycle of the upper tube driving signal. Therefore, the output voltage can be adjusted by adjusting the duty cycle of the upper tube driving signal.

[0045] In another embodiment, there are other implementation methods for the phase-shifted full-bridge circuit 21 to output positive voltage or negative voltage based on the first transformer T1 and the second transformer T2, such as through a body diode, a parasitic capacitor, etc. The principle is similar to the above-mentioned principle of implementation through a switching tube, and will not be repeated here.

[0046] In another embodiment, see Figure 3 , Figure 3 is a structural block diagram of a magnetic integration device provided by an embodiment of the present invention, such as 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 end of the secondary winding of the first transformer T1, the second inductor L2 is connected to the non-same-name end of the secondary winding of the first transformer T1, the third inductor L3 is connected to the same-name end of the secondary winding of the second transformer T2, the fourth inductor L4 is connected to the non-same-name end 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 for gradually increasing the current along with the positive voltage when the secondary winding of the first transformer T1 outputs a positive voltage, and gradually decreasing the current along with the negative voltage when the secondary winding of the first transformer T1 outputs a 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 in combination with the second inductor L2, so that the transformer module 22 outputs a fixed voltage value;

[0049] The second inductor L2 is used for gradually increasing the current along with the negative voltage when the secondary winding of the first transformer T1 outputs a negative voltage, and gradually decreasing the current along with the positive voltage when the secondary winding of the first transformer T1 outputs a positive voltage;

[0050] The third inductor L3 is used for gradually increasing the current along with the positive voltage when the secondary winding of the second transformer T2 outputs a positive voltage, and gradually decreasing the current along with the negative voltage when the secondary winding of the second transformer T2 outputs a negative voltage; and

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

[0052] The fourth inductor L4 is used for gradually increasing the current along with the negative voltage when the secondary winding of the second transformer T2 outputs a negative voltage, and gradually decreasing the current along with the positive voltage when the secondary winding of the second transformer T2 outputs a positive voltage.

[0053] Specifically, when the first transformer T1 and the second transformer T2 output a positive voltage, the positive voltage will be applied to the corresponding first inductor L1 and the third inductor L3, so that the current on the first inductor L1 and the third inductor L3 gradually increases. At this time, since no voltage is applied to the second inductor L2 and the fourth inductor L4, the current on the second inductor L2 and the fourth inductor L4 will gradually decrease. When the first transformer T1 and the second transformer T2 output a negative voltage, the negative voltage will be applied to the second inductor L2 and the fourth inductor L4, so that the voltage on the second inductor L2 and the fourth inductor L4 gradually increases, and at this time, the current on the first inductor L1 and the third inductor L3 will gradually decrease. Based on this, the target voltage can be output in real time through the first inductor L1, the second inductor L2, the third inductor L3 and the fourth inductor L4.

[0054] It should be noted that when the first transformer T1 and the second transformer T2 output positive voltage, the first transformer T1 may resonate with the first inductor L1, the second inductor L2, the third inductor L3 and the fourth inductor L4, thereby causing the voltage on the first transformer T1 to increase, and then causing the voltage between the first inductor L1 and the second inductor L2 to increase. 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 increase, thereby causing the secondary winding voltage of the second transformer T2 to increase. 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 the primary voltage 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 voltage, resulting in the output voltage of the transformer module 22 also 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, thereby limiting the increase in the voltage of the secondary winding of the first transformer T1 or the secondary winding of the second transformer T2, thereby eliminating the voltage oscillation across the first transformer T1.

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

[0056] In some embodiments, Figure 2a-2b , the first inductor L1, the second inductor L2, the third inductor L3 and the fourth inductor L4 all include a main winding and an auxiliary winding coupled to each other;

[0057] The same-name end of the main winding N1 of the first inductor L1 is connected to the same-name end of the secondary winding of the first transformer T1, the same-name end of the main winding N2 of the second inductor L2 is connected to the non-same-name end of the secondary winding of the first transformer T1, the same-name end of the main winding N3 of the third inductor L3 is connected to the same-name end of the secondary winding of the second transformer T2, the same-name end of the main winding N4 of the fourth inductor L4 is connected to the non-same-name end of the secondary winding of the second transformer T2, the same-name end of the auxiliary winding n1 of the first inductor L1 is connected to the same-name end of the auxiliary winding n3 of the third inductor L3, and the same-name end of the auxiliary winding n2 of the second inductor L2 is connected to the same-name end 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 start to work based on the positive voltage output by the first transformer T1 and the second transformer T2, the current on the main winding N1 of the first inductor L1 and the main winding N3 of the third inductor L3 slowly rises. 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 rise, thereby causing the voltage between the main winding N1 of the first inductor L1 and the main winding N2 of the second inductor L2 to rise. Based on the same-name terminal principle, when the voltage of the main winding N1 and the main winding N2 rises, the voltage between the auxiliary winding n1 and the auxiliary winding n2 will also rise, and the auxiliary winding n1 is connected to the auxiliary winding n3, and the auxiliary winding n2 is connected to the auxiliary winding n4, so that the voltage between the auxiliary winding n3 and the auxiliary winding n4 also rises, thereby causing the voltage between the main winding N3 of the third inductor L3 and the main winding N4 of the fourth inductor L4 to rise, thereby causing the voltage on the second transformer T2 to rise. Since the total voltage between the first transformer T1 and the second transformer T2 is a fixed value, the abnormal rise of the voltage of the first transformer T1 and the second transformer T2 is limited, thereby eliminating the voltage oscillation at both ends of the transformer.

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

[0060] The switch module 241 is used to apply the positive voltage output by the secondary windings of the first transformer T1 and the second transformer T2 to the first inductor L1 and the second inductor L2 after receiving the control signal, 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 respond to the negative voltage output by the secondary windings of the first transformer T1 and the second transformer T2, and 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 as to output the current to the filter module 23 through the third inductor L3 and the fourth inductor L4.

[0061] Specifically, when the same-name ends of the secondary windings of the first transformer T1 and the second transformer T2 output positive voltages, the switch module 241 will also receive the control signal output by the controller 10, and input 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 will be output to the filter module 23, so that the filter module 23 outputs the target voltage. When the secondary windings of the first transformer T1 and the second transformer T2 output negative voltages, that is, after the non-same-name ends of the secondary windings of the first transformer T1 and the second transformer T2 output positive voltages, the controller 10 will output a control signal to the switch module 241, so that the current in the second inductor L2 and the fourth inductor L4 gradually increases, and then the current is output to the filter module 23 through the second inductor L2 and the fourth inductor L4.

[0062] In some embodiments, the switch module 241 is used to control the current on the first inductor L1 and the current on the third inductor L3 to increase according to a preset increment, and the current on the second inductor L2 and the current on the fourth inductor L4 to decrease according to a preset decrease amount according to the positive voltage output from the same-name end 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 current on the third inductor L3 to decrease according to a preset decrease amount, and the current on the second inductor L2 and the current on the fourth inductor L4 to increase according to a preset increment according to the negative voltage output from the secondary windings of the first transformer T1 and the second transformer T2 (that is, the positive voltage output from the non-like-name end).

[0063] It should be noted that the same-named ends of the secondary windings of the first transformer T1 and the second transformer T2 will alternately output positive and negative voltages. When the same-named ends output positive voltages, the non-same-named ends will output negative voltages, and vice versa. Therefore, when the same-named ends of the secondary windings of the first transformer T1 and the same-named ends of the secondary windings of the second transformer T2 output positive voltages, since the current on the inductor cannot change suddenly, the current flowing through the first inductor L1 and the third inductor L3 under the action of the positive voltage gradually increases, while the current flowing through the second inductor L2 and the fourth inductor L4 under the action of the positive voltage gradually decreases. Conversely, when the non-same-named ends of the secondary windings of the first transformer T1 and the second transformer T2 output positive voltages, the current on the first inductor L1 and the third inductor L3 gradually decreases, while the current on 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 based on 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, if Figure 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, and the capacitor Co is also used for grounding. The capacitor Co is used to receive the voltage signal 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, Figure 2a-2b As shown, the switch module 241 includes a first switch tube Q5, a second switch tube Q6, a third switch tube Q7 and a fourth switch tube Q8;

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

[0068] The first switch tube Q5, the second switch tube Q6, the third switch tube Q7 and the fourth switch tube Q8 are all used to receive the control signal output by the controller 10, and are alternately turned on according to the control signal, wherein the on-off state of the first switch tube Q5 is the same as that of the third switch tube Q7, the on-off state of the second switch tube Q6 is the same as that of the fourth switch tube Q8, and the first switch tube Q5 and the second switch tube Q6 are alternately turned on.

[0069] Specifically, Figure 2aAs shown, when the same-name end of the secondary winding of the first transformer T1 and the second transformer T2 outputs a positive voltage, the second switch tube Q6 and the fourth switch tube Q8 will also receive a control signal and be turned on based on the control signal. After the same-name end of the secondary winding of the first transformer T1 outputs a positive voltage, the positive voltage will be input to the positive electrode of the capacitor Co through the same-name end of the first transformer T1 and the main winding N1 of the first inductor L1, and then return to the non-same-name end of the first transformer T1 through the negative electrode of the capacitor Co and the second switch tube Q6; at the same time, the positive voltage of the same-name end 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 end of the second transformer T2, and input to the positive electrode of the capacitor Co through the third inductor L3, and then flow back to the non-same-name end of the second transformer T2 through the capacitor Co and the fourth switch tube Q8.

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

[0071] In another embodiment, if Figure 2a-2b , the magnetic integration device 241 also includes a first capacitor C5 and a second capacitor C6;

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

[0073] It should be noted that the inductor has the function of passing direct current and blocking alternating current, that is, when the first transformer T1 and the second transformer T2 output voltage, the voltage passes through the switch module 23, so that the current flowing into the main winding N1 of the first inductor L1, the main winding N2 of the second inductor L2, the main winding N3 of the third inductor L3 and the main winding N4 of the fourth inductor L4 is direct current. Based on the principle of the same terminal, the current on the auxiliary windings n1, n2, n3 and n4 is also direct current, and the capacitor has the function of passing alternating current and blocking direct current, so the auxiliary windings n1 and n3, and the auxiliary windings n2 and n4 will not form a loop, so that the auxiliary windings n1, n2, n3 and n4 are only used to limit the abnormal rise of the voltage of the first transformer T1 or the second transformer T2.

[0074] The present invention provides a magnetic integration 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 end of the secondary winding of the first transformer, the second inductor is connected to the non-same-name end of the secondary winding of the first transformer, the third inductor is connected to the same-name end of the secondary winding of the second transformer, the fourth inductor is connected to the non-same-name end 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 and the third inductor are used for when the secondary winding of the first transformer and the secondary winding of the second transformer output a positive voltage, the current gradually increases with the positive voltage, and when the secondary winding of the first transformer and the secondary winding of the second transformer output a negative voltage, the current gradually decreases with the negative voltage; the second inductor and the fourth inductor are used for when the secondary winding of the first transformer and the secondary winding of the second transformer output a negative voltage, the current gradually increases with the negative voltage, and when the secondary winding of the first transformer and the secondary winding of the second transformer 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 combines with the second inductor to limit the voltage across the third inductor and the fourth inductor, so that the transformer module outputs a fixed voltage value; or when the voltage of the first transformer rises abnormally, the third inductor combines with the fourth inductor to limit the voltage across the first inductor and the second inductor, so that the transformer module outputs a fixed voltage value. Based on this, the voltage oscillation across the two transformer windings when four independent inductors are used 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 the present invention, rather than to limit it. Under the idea of ​​the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes in different aspects of the present invention as above, which are not provided in detail for the sake of simplicity. Although the present invention has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A magnetic integration device, characterized in that: Applied to a low-voltage high-power adjustable power supply, the low-voltage high-power adjustable power supply comprises a transformer module, the transformer module comprises a first transformer and a second transformer, the transformer module is configured to output a fixed voltage value, the magnetic integration device comprises a first inductor, a second inductor, a third inductor and a fourth inductor, the first inductor is used to be connected to the same-name end of the secondary winding of the first transformer, the second inductor is used to be connected to the non-same-name end of the secondary winding of the first transformer, the third inductor is used to be connected to the same-name end of the secondary winding of the second transformer, the fourth inductor is used to be connected to the non-same-name end 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 for gradually increasing the current along with the positive voltage when the secondary winding of the first transformer outputs a positive voltage, and gradually decreasing the current along with the negative voltage when the secondary winding of the first transformer outputs a negative voltage; the first inductor is combined with the second inductor to limit the voltage across the third inductor and the fourth inductor; The second inductor is used for gradually increasing the current along with the negative voltage when the secondary winding of the first transformer outputs a negative voltage, and gradually decreasing the current along with the positive voltage when the secondary winding of the first transformer outputs a positive voltage; The third inductor is used for gradually increasing the current along with the positive voltage when the secondary winding of the second transformer outputs a positive voltage, and gradually decreasing the current along with the negative voltage when the secondary winding of the second transformer outputs a negative voltage; the third inductor is combined with the fourth inductor to limit the voltage across the first inductor and the second inductor; The fourth inductor is used for gradually increasing the current along with the negative voltage when the secondary winding of the second transformer outputs a negative voltage, and gradually decreasing the current along with the positive voltage when the secondary winding of the second transformer outputs a positive voltage.

2. The magnetic integration device according to claim 1, characterized in that: 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-named ends of the main winding of the first inductor are used to be connected to the same-named ends of the secondary winding of the first transformer, the same-named ends of the main winding of the second inductor are used to be connected to the non-same-named ends of the secondary winding of the first transformer, the same-named ends of the main winding of the third inductor are used to be connected to the same-named ends of the secondary winding of the second transformer, the same-named ends of the main winding of the fourth inductor are used to be connected to the non-same-named ends of the secondary winding of the second transformer, the same-named ends of the auxiliary winding of the first inductor are connected to the same-named ends of the auxiliary winding of the third inductor, and the same-named ends of the auxiliary winding of the second inductor are connected to the same-named ends of the auxiliary winding of the fourth inductor.

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

4. The magnetic integration device according to claim 1, characterized in that: The magnetic integration device also includes a switch module; The switch module is connected to the secondary winding of the first transformer and the secondary winding of the second transformer respectively, and is also connected to the first inductor, the second inductor, the third inductor and the fourth inductor respectively, and is also used to receive a control signal; The switch module is used for applying the positive voltage output by the secondary winding of the first transformer and the secondary winding of 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 by 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 integration device according to claim 4, characterized in that: The switch module is used for controlling the current on the first inductor and the current on the third inductor to increase according to a preset increment, and the current on the second inductor and the current on the fourth inductor to decrease according to a preset decrease when the secondary winding of the first transformer and the secondary winding of the second transformer output a positive voltage; And when the first transformer secondary winding and the second transformer secondary winding output a negative voltage, the current on the first inductor and the current on the third inductor are controlled to decrease according to a preset drop amount, and the current on the second inductor and the current on the fourth inductor are controlled to increase according to a preset increment.

6. The magnetic integration device according to claim 4 or 5, characterized in that: The low-voltage high-power adjustable power supply further includes a filter module, the filter module is connected to the first inductor, the second inductor, the third inductor and the fourth inductor, and the switch module includes a first switch tube, a second switch tube, a third switch tube and a fourth switch tube; The first end of the first switch tube is respectively connected to the same-name end of the secondary winding of the first transformer and the first inductor, the second end of the first switch tube is connected to the first end of the second switch tube, the second end of the first switch tube is also connected to the filter module, the second end of the second switch tube is respectively connected to the non-same-name end of the secondary winding of the first transformer and the second inductor, the first end of the third switch tube is respectively connected to the same-name end of the secondary winding of the second transformer and the third inductor, the second end of the third switch tube is connected to the first end of the fourth switch tube, the second end of the third switch tube is also connected to the filter module, the second end of the fourth switch tube is respectively connected to the fourth inductor and the non-same-name end of the secondary winding of the second transformer, and the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are also connected to the controller; The first switch tube, the second switch tube, the third switch tube and the fourth switch tube are all used to receive the control signal output by the controller and are alternately turned on according to the control signal, wherein the on-off state of the first switch tube is the same as that of the third switch tube, the on-off state of the second switch tube is the same as that of the fourth switch tube, and the first switch tube and the second switch tube are alternately turned on.

7. The magnetic integration device according to any one of claims 1 to 5, characterized in that: The turns ratio of the first inductor, the turns ratio of the second inductor, the turns ratio of the third inductor and the turns ratio of 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 comprises a phase-shifted full-bridge circuit, a transformer module, a filter module and a magnetic integrated device as described in any one of claims 1 to 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 winding of the first transformer and the primary winding of the second transformer are connected in series, the primary winding of the first transformer and the primary winding of the second transformer after the series connection are also respectively connected to the phase-shifted full-bridge circuit, the secondary winding of the first transformer and the secondary winding of the second transformer are connected in parallel to each other and connected to the magnetic integration device, the phase-shifted full-bridge circuit is used to receive the bus voltage, the magnetic integration device is also connected to the filter module, and the phase-shifted full-bridge circuit is also used to connect to the controller; The phase-shifted full-bridge circuit is used to receive the driving signal output by the controller, and convert the bus voltage based on the driving signal to output a 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 integration device is used to output the preset voltage to the filter module after receiving the preset voltage, so as to output a target voltage based on the filter module.

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

10. A low pressure system, characterized in that: The low pressure system comprises: Controller; and a low-voltage, high-power adjustable power supply as described in any one of claims 8-9.

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