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 low-voltage high-power adjustable power supply and a low-voltage system, and the power supply comprises a phase-shifted full-bridge circuit, a voltage transformation module, a clamping module and a magnetic integration device. The transformation module comprises a first transformer and a second transformer, a primary winding of the first transformer and a primary winding of the second transformer are connected in series and then connected with the phase-shifted full-bridge circuit, and a secondary winding of the first transformer and a secondary winding of the second transformer are connected in parallel and then connected with the magnetic integration device and the clamping module. The phase-shifted full-bridge circuit is used for receiving bus voltage. Wherein the magnetic integration device is used for outputting a target voltage based on a preset voltage output by the transformer. In the working process of the magnetic integration device, if the voltage of the voltage transformation module rises abnormally, the clamping module limits the total voltage of the two transformers, and therefore voltage oscillation at the two ends of the two transformer windings when the four independent inductors are adopted is eliminated by limiting the voltage of the transformers.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of high-frequency switching power supply, and particularly relates to a low-voltage high-power adjustable power supply and a low-voltage system. BACKGROUND

[0002] In the application occasion of a high-power low-voltage full-range voltage-regulating large-current output power supply, the voltage drop of the secondary circuit has a significant influence on the efficiency. The large current puts higher requirements on the manufacturing process of the transformer and is a challenge to the cooling of the transformer. The current rating of the rectifier diode or the synchronous rectification MOS tube is also higher. The current doubling rectification circuit is evolved from the full-bridge rectification circuit. The switching tube in one bridge arm of the full-bridge rectification circuit is replaced by an inductor to become the current doubling rectification circuit. The transformer secondary of the current doubling rectification circuit only needs one winding, which reduces the manufacturing difficulty of the transformer compared with the full-wave rectification circuit secondary winding with a center tap. The number of switching devices of the current doubling rectification circuit is half of that of the full-bridge rectification circuit. The current flowing through the secondary winding of the transformer of the current doubling rectification circuit is half of that of the full-bridge rectification circuit under the same output current. The average current of the two filter inductors of the current doubling rectification circuit is only half of the output current, which reduces the output current ripple under the same condition.

[0003] Since the current doubling rectification circuit has two inductors, for the occasion of the transformer primary winding in series with the secondary winding in parallel, four inductors are needed. The discrete filter inductor and the transformer parasitic parameters resonate easily to cause voltage oscillation at both ends of the transformer winding. CONTENT OF THE INVENTION

[0004] The embodiment of the present application provides a low-voltage high-power adjustable power supply and a low-voltage system, which are beneficial to solve the technical problem that the voltage oscillation occurs at both ends of the transformer winding due to the resonance of the discrete filter inductor and the transformer parasitic parameters in the existing low-voltage system with two transformer primary windings in series and secondary windings in parallel when the current doubling rectification is performed.

[0005] The utility model discloses a technical scheme adopted by the embodiment is: provide a kind of low-voltage high-power adjustable power supply, low-voltage high-power adjustable power supply includes phase-shift full bridge circuit, voltage transformation module, clamping module and magnetic integrated device;Voltage transformation module includes first transformer and second transformer, the primary winding of first transformer and the primary winding of second transformer are mutually connected in series, the primary winding of first transformer and the primary winding of second transformer are also respectively connected with phase-shift full bridge circuit, the secondary winding of first transformer and the secondary winding of second transformer are mutually connected in parallel and are connected with magnetic integrated device, the secondary winding of first transformer and the secondary winding of second transformer are also all connected with clamping module, phase-shift full bridge circuit is used to receive bus voltage;Phase-shift full bridge circuit is used to export voltage signal to voltage transformation module according to bus voltage, to make voltage transformation module convert voltage signal to preset voltage according to the turns ratio of first transformer and the turns ratio of second transformer;Magnetic integrated device is used to receive preset voltage, and based on preset voltage starts work, to export target voltage;Clamping module is used to limit the output voltage of the voltage transformation module as preset voltage when magnetic integrated device works.

[0006] In some embodiments, the clamping module includes a first capacitor and a second capacitor, the first capacitor is connected with the same name end of the secondary winding of the first transformer and the same name end of the secondary winding of the second transformer respectively, and the second capacitor is connected with the non-same name end of the secondary winding of the first transformer and the same name end of the secondary winding of the second transformer respectively.

[0007] In some embodiments, the clamping module further includes a first resistor and a second resistor, the first resistor is connected in series with the first capacitor, and the first resistor is also connected with the same name end of the secondary winding of the first transformer; the second resistor is connected in series with the second capacitor, and the second resistor is also connected with the non-same name end of the secondary winding of the first transformer.

[0008] In some embodiments, the low-voltage high-power adjustable power supply further includes a filtering module, and the magnetic integrated device includes a first inductor module and a second inductor module; the first inductor module is connected with the same name end of the secondary winding of the first transformer and the same name end of the secondary winding of the second transformer respectively, and the second inductor module is connected with the non-same name end of the secondary winding of the first transformer and the non-same name end of the secondary winding of the second transformer respectively; the first inductor module and the second inductor module are also connected with the filtering module; the first inductor module is configured to gradually increase the current with the positive voltage when the preset voltage is a positive voltage, so as to output the target voltage to the filtering module, and gradually decrease the current with the negative voltage when the preset voltage is a negative voltage; the second inductor module is configured to gradually decrease the current with the positive voltage when the preset voltage is a positive voltage, and gradually increase the current with the negative voltage when the preset voltage is a negative voltage, so as to output the target voltage to the filtering module.

[0009] In some embodiments, the magnetic integrated device further comprises a switch module; the switch module is connected with the first transformer secondary winding and the second transformer secondary winding respectively, and is also connected with the first inductor module and the second inductor module respectively; the switch module is further configured to receive a control signal; after receiving the control signal, the switch module is configured to apply positive voltage output by the first transformer secondary winding and the second transformer secondary winding to the first inductor module, so that the current flowing through the first inductor module gradually increases under the action of the positive voltage; and according to the control signal, the switch module is configured to apply negative voltage output by the first transformer secondary winding and the second transformer secondary winding to the second inductor module, so that the current flowing through the second inductor module gradually increases under the action of the negative voltage.

[0010] In some embodiments, the first inductor module comprises a first inductor and a third inductor, and the second inductor module comprises a second inductor and a fourth inductor; the switch module is further connected with the first inductor, the second inductor, the third inductor and the fourth inductor respectively; when the first transformer secondary winding and the second transformer secondary winding output positive voltage, the switch module is configured 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 decrement; and when the first transformer secondary winding and the second transformer secondary winding output negative voltage, the switch module is configured to control the current on the first inductor and the current on the third inductor to decrease by a preset decrement, and the current on the second inductor and the current on the fourth inductor to increase by a preset increment.

[0011] In some embodiments, the switch module comprises a first switch tube, a second switch tube, a third switch tube and a fourth switch tube; a first end of the first switch tube is connected with the same end of the first transformer secondary winding and the first inductor respectively, a second end of the first switch tube is connected with a first end of the second switch tube, and the second end of the first switch tube is also connected with the filter module; a second end of the second switch tube is connected with the other end of the first transformer secondary winding and the second inductor respectively; a first end of the third switch tube is connected with the same end of the second transformer secondary winding and the third inductor respectively, a second end of the third switch tube is connected with a first end of the fourth switch tube, and the second end of the third switch tube is also connected with the filter module; a second end of the fourth switch tube is connected with the fourth inductor and the other end of the second transformer secondary winding respectively; the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are also connected with the controller; the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are configured to receive the control signal output by the controller, and are configured to alternately conduct according to the control signal, wherein the first switch tube and the third switch tube have the same on-off state, the second switch tube and the fourth switch tube have the same on-off state, and the first switch tube and the second switch tube are alternately conducted.

[0012] In some embodiments, the number of turns of the first inductor, the number of turns of the second inductor, the number of turns of the third inductor, and the number of turns of the fourth inductor are all the same; the inductance of the first inductor, the inductance of the second inductor, the inductance of the third inductor, and the inductance of the fourth inductor are all the same.

[0013] In some embodiments, the same-named end of the first transformer primary winding is located at a first position of the first transformer, and the same-named end of the second transformer primary winding is located at a first position of the second transformer; the same-named end of the first transformer secondary winding is located at a second position of the first transformer, and the same-named end of the second transformer secondary winding is located at a second position of the second transformer, and the winding structure and the turn ratio of the first transformer are the same as the winding structure and the turn ratio of the second transformer.

[0014] To solve the above technical problems, another technical scheme adopted by the embodiment of the utility model is to provide a low-voltage system, which comprises a controller and a low-voltage high-power adjustable power supply as above.

[0015] Unlike the related art, the low-voltage high-power adjustable power supply and the low-voltage system of the utility model, the low-voltage high-power adjustable power supply comprises a phase-shift full-bridge circuit, a transformer module, a clamping module and a magnetic integrated device, the transformer module comprises a first transformer and a 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 are also connected with the phase-shift full-bridge circuit respectively, the secondary winding of the first transformer and the secondary winding of the second transformer are connected in parallel with each other and connected with the magnetic integrated device, the secondary winding of the first transformer and the secondary winding of the second transformer are also connected with the clamping module respectively, and the phase-shift full-bridge circuit is used for receiving a bus voltage. The phase-shift full-bridge circuit is used for outputting a voltage signal to the transformer module according to the bus voltage, so that the transformer module converts the voltage signal to a preset voltage according to the turn ratio of the first transformer and the turn ratio of the second transformer; the magnetic integrated device is used for receiving the preset voltage and starting to work based on the preset voltage to output a target voltage. The clamping module is used for limiting the output voltage of the transformer module to the preset voltage when the magnetic integrated device is working.

[0016] When the magnetic integrated device starts to work based on the preset voltage, if the voltage of the first transformer or the second transformer abnormally rises, the clamping module will limit the total voltage of the first transformer and / or the second transformer, so that the transformer module outputs a fixed voltage value, and then the voltage oscillation at both ends of the windings of the two transformers when four independent inductors are used is eliminated by limiting the voltage of the transformer. BRIEF DESCRIPTION OF DRAWINGS

[0017] One or more embodiments are illustrated by way of example, in which elements having the same reference number designate the same or similar elements. Examples as illustrated in the drawings are not intended to limit the embodiments to the specific embodiments dishplayed herein but can be applied to other forms of embodiments, unless otherwise specifically noted.

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

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

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

[0021] Figure 3 is a structural block diagram of a magnetic integrated device provided by an embodiment of the application. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the utility model clearer, the utility model is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and do not limit the utility model.

[0023] The technical features involved in each embodiment of the 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 one or more intermediate elements can be present therebetween.

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

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. All publications, patent applications, patents, and other references mentioned herein are incorporated by reference in their entirety.

[0027] Please refer to Figure 1 , Figure 1 is a structure block diagram of a low-voltage system provided by an embodiment of the application, as Figure 1 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 with the low-voltage high-power adjustable power supply 20, the controller 10 is used for controlling 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 preset voltage.

[0028] In some embodiments, the low-voltage system 100 further includes a bus capacitor (not shown in the figure), the bus capacitor is connected with the low-voltage high-power adjustable power supply 20, wherein the bus capacitor is used for storing high voltage, and the low-voltage high-power adjustable power supply 20 is used for receiving the bus voltage output by the bus capacitor and processing the bus voltage based on the driving signal of the controller 10, so as to output the preset voltage.

[0029] In still another embodiment, as Figure 1 shown, the low-voltage high-power adjustable power supply 20 includes a phase-shifted full-bridge circuit 21, a transformer module 22, a clamping module 25 and a magnetic integrated device 24.

[0030] The transformer module 22 includes a first transformer T1 and a second transformer T2, the primary winding of the first transformer T1 and the primary winding of the second transformer T2 are connected in series with each other, the primary winding of the first transformer T1 and the primary winding of the second transformer T2 are also connected with the phase-shifted 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 with each other and connected with the magnetic integrated device 24, the clamping module 25 is connected with the secondary winding of the first transformer T1 and the secondary winding of the second transformer T2 respectively, the phase-shifted full-bridge circuit 21 is used for receiving the bus voltage, and the phase-shifted full-bridge circuit 21 is also used for being connected with the controller 10.

[0031] The phase-shifted full-bridge circuit 21 is used for outputting a voltage signal to the transformer module 23 according to the bus voltage, so that the transformer module 23 converts the voltage signal to a preset voltage according to the turns ratio of the first transformer T1 and the turns ratio of the second transformer T2.

[0032] The magnetic integrated device 24 is used for receiving the preset voltage and starting to work based on the preset voltage, so as to output a target voltage.

[0033] The clamping module 25 is used to limit the output voltage of the transformer module 23 to a preset voltage when the magnetic integration device 24 is working.

[0034] In some embodiments, the winding structure and the turn ratio of the first transformer T1 are the same as those of the second transformer T2. It should be noted that the winding structure includes the number of turns and the winding method of the transformer, and the winding structure and the turn ratio of the first transformer T1 are set to be the same as those of the second transformer T2, so that when the primary winding (primary winding end) voltage of the first transformer T1 is the same as that of the second transformer T2, the secondary winding (secondary winding end) voltage of the first transformer T1 and the secondary winding voltage of the second transformer T2 are also the same.

[0035] Specifically, the phase-shifted full-bridge circuit 21 is also connected with the bus capacitor, and when the phase-shifted full-bridge circuit 21 receives the driving signal output by the controller 10, it will convert the bus voltage output by the bus capacitor based on the driving signal, thereby outputting a first voltage signal to the primary winding 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 the turn ratio of the first transformer T1 and the second transformer T2 are the same, the primary winding of the first transformer T1 and the primary winding of the second transformer T2 share the voltage of the first voltage signal, and the voltage shared by the primary winding of the first transformer T1 and the primary winding of the second transformer T2 is the same. Based on the same turn ratio of the transformer, after the first transformer T1 and the second transformer T2 convert the first voltage signal into a second voltage signal, the second voltage signal output by the first transformer T1 is the same as the second voltage signal output by the second transformer T2. After the first transformer T1 and the second transformer T2 output the second voltage signal respectively, the magnetic integration device 24 processes the second voltage signal based on the control signal output by the controller 10, thereby outputting a target voltage.

[0036] In some embodiments, the low-voltage high-power adjustable power supply 20 further comprises a filtering module 23 connected with the magnetic integration device 24, and the filtering module 23 is used to receive the target voltage output by the magnetic integration device 24 when the magnetic integration device 24 is working.

[0037] It should be noted that by connecting the primary winding of the first transformer T1 and the primary winding of the second transformer T2 in series, and connecting the secondary winding of the first transformer T1 and the secondary winding of the second transformer T2 in parallel, the current of the primary winding of the first transformer T1 and the primary winding of the second transformer T2 is the same, and the transmission power of the power supply is increased.

[0038] When the magnetic integrated device 24 starts to work based on the preset voltage output by the voltage transformation module 23, the voltage and current in the magnetic integrated device 24 are in a state of real-time change. At this time, the first transformer T1 / second transformer T2 may oscillate with the magnetic integrated device 24, thereby causing the voltage on the first transformer T1 / second transformer T2 to abnormally rise, and further disturbing the turn ratio relationship between the primary winding and the secondary winding of the first transformer T1 / second transformer T2. Therefore, in order to avoid the oscillation of the first transformer T1 / second transformer T2, the clamping module 25 is introduced to limit the voltage on the first transformer T1 / second transformer T2, thereby avoiding the oscillation of the first transformer T1 / second transformer T2 with the magnetic integrated device 24, and further improving the circuit stability.

[0039] In yet another embodiment, referring to Figures 2a-2b , Figure 2a is a circuit diagram after the fifth switch tube and the eighth switch tube are turned on in a low-voltage high-power adjustable power supply provided by the embodiment of the present application, Figure 2b is a circuit diagram after the sixth switch tube and the seventh switch tube are turned on in a low-voltage high-power adjustable power supply provided by the embodiment of the present application. As Figures 2a-2b shown, the like-named end (A) of the primary winding of the first transformer T1 is located at the first position of the first transformer T1, and the like-named end (B) of the primary winding of the second transformer T2 is located at the first position of the second transformer T2.

[0040] The like-named end (a) of the secondary winding of the first transformer T1 is located at the second position of the first transformer T1, and the like-named end (b) of the secondary winding of the second transformer T2 is located at the second position of the second transformer T2.

[0041] It should be noted that by setting the like-named end of the first transformer T1 and the like-named 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 equalized according to the same turn ratio of the transformers, and the current sharing of the two transformers is realized.

[0042] In some embodiments, as Figures 2a-2b 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 parasitic capacitances and external parallel capacitances corresponding to the switch tubes, and the inductor Lr is the sum of leakage inductances and external inductances of the first transformer T1 and the second transformer T2.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] It should be noted that the controller 10 adopts a limited bipolar control method when outputting the drive signal, and in the present description, a drive signal with a 50% duty cycle is used to drive the lower tube, that is, the duty cycle of the drive signals 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 conduction time is consistent, thereby realizing the purpose of adjusting the pulse width of the drive signals of the fifth switch tube Q1 and the sixth switch tube Q2 to adjust the output voltage. Among them, by setting the duty cycle of the drive signals of the seventh switch tube Q3 and the eighth switch tube Q4 to 50%, the reliability of the upper tube driving circuit power supply can be ensured. It can be known that the phase-shift full-bridge circuit 21 mainly realizes the output of positive and negative voltages by controlling the duty cycle of the upper tube driving signal, so the output voltage can be adjusted by adjusting the duty cycle of the upper tube driving signal.

[0047] In yet another embodiment, the phase-shift full-bridge circuit 21 outputs positive or negative voltage based on the first transformer T1 and the second transformer T2, and other implementation manners, such as implementation by a body diode, implementation by a parasitic capacitor, and the like, which principles are similar to the above-mentioned implementation by a switch tube, and will not be described here.

[0048] In another embodiment, please refer to Figure 3 , Figure 3 is a structural block diagram of a magnetic integrated device provided by an embodiment of the present application, as Figure 3 shown, the magnetic integrated device 24 includes a first inductor module 241 and a second inductor module 242.

[0049] The first inductor module 241 is connected to the same-named end of the secondary winding of the first transformer T1 and the same-named end of the secondary winding of the second transformer T2, respectively, and the second inductor module 242 is connected to the non-same-named end of the secondary winding of the first transformer T1 and the non-same-named end of the secondary winding of the second transformer T2, respectively. The first inductor module and the second inductor module are also connected to the filter module.

[0050] The first inductor module 241 is configured to gradually increase the current with the positive voltage when the preset voltage is a positive voltage, thereby outputting a target voltage to the filter module 23, and gradually decrease the current with the negative voltage when the preset voltage is a negative voltage.

[0051] The second inductor module 242 is configured to gradually decrease the current with the positive voltage when the preset voltage is a positive voltage, and gradually increase the current with the negative voltage when the preset voltage is a negative voltage, thereby outputting a target voltage to the filter module 23.

[0052] Specifically, when the first transformer T1 and the second transformer T2 output positive voltage, this positive voltage is applied to the first inductor module 241, causing the current in the first inductor module 241 to rise slowly, while the current in the second inductor module 242 gradually decreases, thus making the voltage on the filter module 23 the target voltage. Conversely, if the first transformer T1 and the second transformer T2 output negative voltage, this negative voltage is applied to the second inductor module 242, causing the current in the second inductor module 242 to rise slowly, while the current in the first inductor module 241 gradually decreases, thus making the voltage on the filter module 23 the target voltage. When the current of the first inductor module 241 / second inductor module 242 changes, the first transformer T1 / second transformer T2 may oscillate with the first inductor module 241 and / or the second inductor module 242, resulting in an abnormal increase in voltage on the first transformer T1 / second transformer T2. At this time, the clamping module 25 will limit the voltage on the first transformer T1 / second transformer T2, thereby preventing the first transformer T1 / second transformer T2 from oscillating with the first inductor module 241 and / or the second inductor module 242, and thus improving circuit stability.

[0053] In some embodiments, such as Figure 2a or Figure 2b As shown, the clamping module 25 includes a first capacitor C1, a second capacitor C2, a first resistor R1, and a second resistor R2.

[0054] The first capacitor C1 is connected to the same-name terminal of the secondary winding of the first transformer T1 and the same-name terminal of the secondary winding of the second transformer T2. The second capacitor C2 is connected to the non-same-name terminal of the secondary winding of the first transformer T1 and the same-name terminal of the secondary winding of the second transformer T2. The first resistor R1 is connected in series with the first capacitor C1 and is also connected to the same-name terminal of the secondary winding of the first transformer T1. The second resistor R2 is connected in series with the second capacitor C2 and is also connected to the non-same-name terminal of the secondary winding of the first transformer T1.

[0055] It can be known that when the first transformer T1 and the second transformer T2 output positive voltage, the first transformer T1 can resonate with the first inductor module 241 and the second inductor module 242, so as to cause the voltage on the first transformer T1 to rise. However, since the turns ratio and the winding structure of the first transformer T1 and the second transformer T2 are the same, and the primary voltage of the first transformer T1 and the primary voltage of the second transformer T2 are the same and 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, so that the output voltage of the transformer module 22 is also a fixed voltage. Based on this, when the voltage of the first transformer T1 rises, since the voltages at both ends of the capacitor change suddenly, and the first capacitor C1 is connected to the same terminals of the two transformers, and the second capacitor C2 is connected to the non-same terminals of the two transformers, the voltage of the second transformer T2 also rises abnormally. However, the output voltage of the transformer module 22 is a fixed voltage, thereby limiting the rise of the secondary winding voltage of the first transformer T1 or the secondary winding voltage of the second transformer T2, and further eliminating the voltage oscillation at both ends of the first transformer T1.

[0056] In some embodiments, the way to eliminate the voltage oscillation at both ends of the second transformer T2 is the same as the way to eliminate the voltage oscillation at both ends of the first transformer T1, which will not be repeated here.

[0057] In yet another embodiment, the magnetic integration device 24 further comprises a switch module 243, the switch module 243 is connected with the first transformer T1 and the second transformer T2 respectively, the switch module 243 is also connected with the first inductor module 241 and the second inductor module 242 respectively, and the switch module 243 is also used for receiving a control signal.

[0058] The switch module 243 is used for, after receiving the control signal, applying the positive voltage output by the secondary winding of the first transformer T1 and the secondary winding of the second transformer T2 to the first inductor module 241, so that the current flowing through the first inductor module 241 gradually rises 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 T1 and the secondary winding of the second transformer T2 is applied to the second inductor module 242, so that the current flowing through the second inductor module 242 gradually rises under the action of the negative voltage.

[0059] Specifically, when the same name terminals of the secondary windings of the first transformer T1 and the second transformer T2 output positive voltage, the switch module 243 also receives the control signal output by the controller 10, and inputs positive voltage into the first inductor module 241 based on the control signal, so as to gradually increase the current in the first inductor module 241. After the current flows through the first inductor module 241, it is output to the filter module 23, thereby making the filter module 23 output the target voltage. When the secondary windings of the first transformer T1 and the second transformer T2 output negative voltage, that is, the non-same name 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 switch module 243, thereby gradually increasing the current in the second inductor module 242, and then outputting the current to the filter module 23 through the second inductor module 242.

[0060] In another embodiment, the first inductor module 241 includes a first inductor L1 and a third inductor L3, the second inductor module 242 includes a second inductor L2 and a fourth inductor L4, and the switch module 243 is further connected with the first inductor L1, the second inductor L2, the third inductor L3 and the fourth inductor L4, respectively.

[0061] The switch module 243 is configured to, when the secondary windings of the first transformer T1 and the second transformer T2 output positive voltage, control the current on the first inductor L1 and the current on the third inductor L3 to increase by a preset increment, and control the current on the second inductor L2 and the current on the fourth inductor L4 to decrease by a preset decrement.

[0062] And when the secondary windings of the first transformer T1 and the second transformer T2 output negative voltage, control the current on the first inductor L1 and the current on the third inductor L3 to decrease by a preset decrement, and control the current on the second inductor L2 and the current on the fourth inductor L4 to increase by a preset increment.

[0063] It should be noted that the same name end of the secondary winding of the first transformer T1 and the secondary winding of the second transformer T2 alternately outputs positive and negative voltage. When the same name end outputs positive voltage, the non-same name end outputs negative voltage, and vice versa. Therefore, after the same name end of the secondary winding of the first transformer T1 and the same name end of the secondary winding of the second transformer T2 output positive voltage, due to the fact that the current on the inductor cannot be suddenly changed, the current flowing through the first inductor L1 and the third inductor L3 gradually increases under the action of the positive voltage, and the current flowing through the second inductor L2 and the fourth inductor L4 gradually decreases under the action of the positive voltage. Conversely, when the non-same name end of the secondary winding of the first transformer T1 and the non-same name end of the secondary winding of the second transformer T2 output positive voltage, the current flowing through the first inductor L1 and the third inductor L3 gradually decreases, and the current flowing through the second inductor L2 and the fourth inductor L4 gradually increases. Based on this, the filter module 23 can output a voltage that is 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 number of turns of the first inductor L1, the number of turns of the second inductor L2, the number of turns of the third inductor L3, and the number of turns of the fourth inductor L4 are the same.

[0065] The inductance of the first inductor L1, the inductance of the second inductor L2, the inductance of the third inductor L3, and the inductance of the fourth inductor L4 are the same.

[0066] In another embodiment, as shown in Figures 2a-2b , 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 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.

[0067] In some embodiments, as shown in Figures 2a-2b , 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.

[0068] The first end of the first switch tube Q5 is connected with the same 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 with the first end of the second switch tube Q6, and the second end of the first switch tube Q5 is also connected with the filter module 23, the second end of the second switch tube Q6 is connected with the non-same 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 with the same 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 with the first end of the fourth switch tube Q8, and the second end of the third switch tube Q7 is also connected with the filter module 23, the second end of the fourth switch tube Q8 is connected with the fourth inductor L4 and the non-same 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 with the controller 10.

[0069] The first switch tube Q5, the second switch tube Q6, the third switch tube Q7 and the fourth switch tube Q8 are used for receiving the control signal output by the controller 10, and are alternately turned on according to the control signal, wherein the first switch tube Q5 and the third switch tube Q7 have the same on-off state, the second switch tube Q6 and the fourth switch tube Q8 have the same on-off state, and the first switch tube Q5 and the second switch tube Q6 are alternately turned on.

[0070] Specifically, as shown in Figure 2a When the same 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 the control signal and be turned on based on the control signal. After the same 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 end of the first transformer T1 and the first inductor L1, and then will flow back to the non-same 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 end of the secondary winding of the second transformer T2 will flow into the third inductor L3 through the same end of the second transformer T2, and then will be input to the positive electrode of the capacitor Co through the third inductor L3, and then will flow back to the non-same end of the second transformer T2 through the capacitor Co and the fourth switch tube Q8.

[0071] In some embodiments, as Figure 2bAs shown, when the first transformer T1 and the second transformer T2 secondary winding non-same end output positive voltage, the first switch tube Q5 and the third switch tube Q7 will also receive the control signal, and turn on based on the control signal. At this time, the positive voltage will pass through the non-same end of the first transformer T1, the second inductor L2, the capacitor Co, the first switch tube Q5 back to the same end of the first transformer T1; At the same time, the positive voltage output by the non-same end of the second transformer T2 will flow back to the same end of the second transformer T2 through the fourth inductor L4, the capacitor Co and the third switch tube Q7. Based on this, the first transformer T1 and the second transformer T2 secondary winding can output positive and negative voltage to the filter module 23, so that the low-voltage high-power adjustable power supply 20 can output the target voltage in real time.

[0072] The application provides a low-voltage high-power adjustable power supply and a low-voltage system. The low-voltage high-power adjustable power supply comprises a phase-shifted full-bridge circuit, a transformer module, a clamping module and a magnetic integrated device. The transformer module comprises a first transformer and a 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 are also connected to the phase-shifted full-bridge circuit respectively. The secondary winding of the first transformer and the secondary winding of the second transformer are connected in parallel with each other and connected to the magnetic integrated device. The secondary winding of the first transformer and the secondary winding of the second transformer are also connected to the clamping module respectively. The phase-shifted full-bridge circuit is used to receive a bus voltage. The phase-shifted full-bridge circuit is used to output a voltage signal to the transformer module according to the bus voltage, so that the transformer module converts the voltage signal to a preset voltage according to the turns ratio of the first transformer and the turns ratio of the second transformer. The magnetic integrated device is used to receive the preset voltage and start working based on the preset voltage to output a target voltage. The clamping module is used to limit the output voltage of the transformer module to the preset voltage when the magnetic integrated device is working.

[0073] When the magnetic integrated device starts working based on the preset voltage, if the voltage of the first transformer or the second transformer abnormally rises, the clamping module will limit the total voltage of the first transformer and / or the second transformer, so that the transformer module outputs a fixed voltage value, and then eliminates the voltage oscillation at both ends of the windings of the two transformers by limiting the voltage of the transformer when four independent inductors are used.

[0074] Finally, it should be noted that: the above examples are used to illustrate the technical solutions of the present application, rather than limiting them; under the idea of the present application, the technical features in the above examples or different examples can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the present application as above, which are not provided in details for simplicity; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A low voltage high power adjustable power supply, characterized by, The low-voltage high-power adjustable power supply comprises a phase-shift full-bridge circuit, a transformer module, a clamping module and a magnetic integrated device; The transformer module comprises a first transformer and a 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 are also connected with the phase-shift full-bridge circuit respectively, the secondary winding of the first transformer and the secondary winding of the second transformer are connected in parallel with each other and connected with the magnetic integrated device, the secondary winding of the first transformer and the secondary winding of the second transformer are also connected with the clamping module respectively, and the phase-shift full-bridge circuit is used for receiving a bus voltage; The phase-shift full-bridge circuit is used for outputting a voltage signal to the transformer module according to the bus voltage, so that the transformer module converts the voltage signal to a preset voltage according to the turns ratio of the first transformer and the turns ratio of the second transformer; The magnetic integrated device is used for receiving the preset voltage and starting to work based on the preset voltage to output a target voltage; The clamping module is used for limiting the output voltage of the transformer module to the preset voltage when the magnetic integrated device works.

2. The low voltage high power adjustable power supply of claim 1, wherein, The clamping module comprises a first capacitor and a second capacitor, the first capacitor is connected with the same-named end of the secondary winding of the first transformer and the same-named end of the secondary winding of the second transformer respectively, and the second capacitor is connected with the non-same-named end of the secondary winding of the first transformer and the same-named end of the secondary winding of the second transformer respectively.

3. The low voltage high power adjustable power supply of claim 2, wherein, The clamping module further comprises a first resistor and a second resistor, the first resistor is connected with the first capacitor in series, and the first resistor is also connected with the same-named end of the secondary winding of the first transformer; the second resistor is connected with the second capacitor in series, and the second resistor is also connected with the non-same-named end of the secondary winding of the first transformer.

4. The low voltage high power adjustable power supply of claim 1, wherein, The low-voltage high-power adjustable power supply further comprises a filter module, and the magnetic integrated device comprises a first inductor module and a second inductor module; The first inductor module is connected with the same-named end of the secondary winding of the first transformer and the same-named end of the secondary winding of the second transformer respectively, and the second inductor module is connected with the non-same-named end of the secondary winding of the first transformer and the non-same-named end of the secondary winding of the second transformer respectively; the first inductor module and the second inductor module are also connected with the filter module respectively; The first inductor module is configured to gradually increase the current with the positive voltage when the preset voltage is a positive voltage, so as to output a target voltage to the filter module, and gradually decrease the current with the negative voltage when the preset voltage is a negative voltage; The second inductor module is configured to gradually decrease the current with the positive voltage when the preset voltage is a positive voltage, and gradually increase the current with the negative voltage when the preset voltage is a negative voltage, so as to output a target voltage to the filter module.

5. The low voltage high power adjustable power supply of claim 4, wherein, The magnetic integrated device further comprises a switch module; The switch module is connected with the secondary winding of the first transformer and the secondary winding of the second transformer respectively, and is also connected with the first inductor module and the second inductor module respectively, and is used for receiving a control signal; The switch module is used for applying positive voltage output by the secondary winding of the first transformer and the secondary winding of the second transformer on the first inductor module to gradually increase current flowing through the first inductor module under the action of the positive voltage after receiving the control signal; and applying negative voltage output by the secondary winding of the first transformer and the secondary winding of the second transformer on the second inductor module to gradually increase current flowing through the second inductor module under the action of the negative voltage according to the control signal.

6. The low voltage high power adjustable power supply of claim 5, wherein, The first inductor module comprises a first inductor and a third inductor, and the second inductor module comprises a second inductor and a fourth inductor, and the switch module is also connected with the first inductor, the second inductor, the third inductor and the fourth inductor respectively; The switch module is used for controlling current on the first inductor and current on the third inductor to increase by a preset increment and controlling current on the second inductor and current on the fourth inductor to decrease by a preset decrement when positive voltage output by the secondary winding of the first transformer and the secondary winding of the second transformer; and controlling current on the first inductor and current on the third inductor to decrease by a preset decrement and controlling current on the second inductor and current on the fourth inductor to increase by a preset increment when negative voltage output by the secondary winding of the first transformer and the secondary winding of the second transformer.

7. The low-voltage high-power adjustable power supply of claim 6, wherein, The switch module comprises 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 connected with the same-named end of the secondary winding of the first transformer and the first inductor respectively, the second end of the first switch tube is connected with the first end of the second switch tube, and the second end of the first switch tube is also connected with the filter module, the second end of the second switch tube is connected with the non-same-named end of the secondary winding of the first transformer and the second inductor respectively, the first end of the third switch tube is connected with the same-named end of the secondary winding of the second transformer and the third inductor respectively, the second end of the third switch tube is connected with the first end of the fourth switch tube, and the second end of the third switch tube is also connected with the filter module, the second end of the fourth switch tube is connected with the fourth inductor and the non-same-named end of the secondary winding of the second transformer respectively, and the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are also connected with a controller. The first switch tube, the second switch tube, the third switch tube and the fourth switch tube are used for receiving the control signal output by the controller and are alternately turned on according to the control signal, wherein the first switch tube and the third switch tube have the same on-off state, the second switch tube and the fourth switch tube have the same on-off state, and the first switch tube and the second switch tube are alternately turned on.

8. The low-voltage high-power adjustable power supply according to claim 6, wherein, the number of turns of the first inductor, the number of turns of the second inductor, the number of turns of the third inductor and the number of turns of the fourth inductor are the same; the inductance of the first inductor, the inductance of the second inductor, the inductance of the third inductor and the inductance of the fourth inductor are the same.

9. The low-voltage high-power adjustable power supply according to any one of claims 1-8, wherein, 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; the winding structure and the turn ratio of the first transformer are the same as the winding structure and the turn ratio of the second transformer.

10. A low pressure system characterized by, The low-voltage system comprises: a controller; and the low-voltage high-power adjustable power supply according to any one of claims 1-9.

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