Converter circuit, power module and charging module
By introducing a clamping circuit into the converter circuit, the energy loss and biasing problems in parallel of multiple isolated DC/DC converters are solved, and more efficient energy conversion is achieved.
Patent Information
- Application Number
- CN202421633536.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-10
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-07-10
AI Technical Summary
There are problems of energy loss and bias when the multi-isolated DC/DC converter is connected in parallel.
A converter circuit is designed, including a bridge inverter module, resonant cavity, transformer module, rectifier module, clamping circuit and energy storage module. Through the clamping circuit, the oscillation voltage of the secondary winding of the transformer is clamped under the voltage of the energy storage module to suppress the oscillation amplitude loss and avoid energy loss and bias voltage.
It effectively suppresses the oscillation of the transformer, reduces heat loss and line loss, and improves energy conversion efficiency.
Smart Images
Figure CN223093673U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of converters, and particularly to a converter circuit, a power module, and a charging module. Background Art
[0002] Generally, an isolated DC / DC converter obtains the final DC output through rectification of the output of a transformer, and realizes power expansion in the form of parallel connection of multiple isolated DC / DC converters to meet high-power requirements. The transformers in each isolated DC / DC converter after parallel connection are connected in series. However, due to the differences in the positions and parasitic parameters of different transformers, resonance occurs inside the transformers after series connection, resulting in energy loss and bias voltage, etc. Summary of the Invention
[0003] The main purpose of the present application is to provide a converter circuit, a power module, and a charging module, aiming to solve the technical problems of energy loss and bias voltage when multiple isolated DC / DC converters are connected in parallel.
[0004] To achieve the above object, the present application provides a converter circuit, including multiple parallel conversion circuits. The conversion circuit includes a bridge inverter module, a resonant cavity, a voltage transformation module, a rectification module, a clamping circuit, and a first energy storage module. The input end of the bridge inverter module is connected to the signal input end of the converter circuit, and the bridge inverter module is used to convert the DC voltage at the signal input end of the converter circuit into an AC voltage signal. The resonant cavity is connected to the output end of the bridge inverter module, and the resonant cavity is used to shape the AC voltage signal. The primary winding of the voltage transformation module is connected to the resonant cavity and the bridge inverter module, and both ends of the secondary winding of the voltage transformation module are connected to the input end of the rectification module. The voltage transformation module is used to adjust the shaped voltage signal to a preset voltage. Among them, the voltage transformation module includes at least two transformers. In each conversion circuit, the secondary winding of a transformer in any one conversion circuit is connected in series with the secondary winding of a transformer in other conversion circuits to form a first connection branch. The output end of the rectification module is connected to the signal output end of the converter circuit, and the rectification module is used to limit the current of the output voltage of the voltage transformation module. One end of the clamping circuit is connected in series to the first connection branch, and the other end is connected to the signal output end of the converter circuit. The clamping circuit is used to clamp the voltage of the secondary winding of the transformer in the first connection branch. The first energy storage module is connected in parallel to the signal output end of the converter circuit, and the first energy storage module is used to store the voltage output by the rectification module.
[0005] Optionally, the signal output terminals of the converter circuit include a positive signal output terminal and a negative signal output terminal; the clamping circuit includes a first clamping branch and a second clamping branch; one end of the first clamping branch is connected in series in the first connection branch, and the other end is connected to the positive signal output terminal; one end of the second clamping branch is connected in series in the first connection branch, and the other end is connected to the negative signal output terminal; wherein, the current flowing through the first clamping branch is opposite in polarity to the current flowing through the second clamping branch.
[0006] Optionally, the signal output terminals of the converter circuit include a positive signal output terminal and a negative signal output terminal; the clamping circuit includes a first diode and a second diode; the anode of the first diode is connected in series in the first connection branch, and the cathode is connected to the positive signal output terminal. The first diode is used to clamp the voltage of the secondary winding of the transformer in the first connection branch when an overvoltage signal of positive voltage is generated in the secondary winding of the voltage conversion module; the cathode of the second diode is connected in series in the first connection branch, and the anode is connected to the negative signal output terminal. The second diode is used to clamp the voltage of the secondary winding of the transformer in the first connection branch when an overvoltage signal of negative voltage is generated in the secondary winding of the voltage conversion module.
[0007] Optionally, the signal output terminals of the converter circuit include a positive signal output terminal and a negative signal output terminal; the converter circuit further includes: a first switching switch connected to the signal output terminal of the converter circuit corresponding to the first connection branch, and the first switching switch is used to parallel the output terminals of two adjacent conversion circuits under the action of a control signal; a second switching switch connected in series between the first energy storage modules of each conversion circuit, and the second switching switch is used to series the output terminals of each conversion circuit under the action of a control signal; a second energy storage module connected in parallel across the bridge inverter module for writing the voltage of the signal input terminal; the first energy storage module includes a second capacitor, and the second capacitor is connected in parallel across the signal output terminal; the second energy storage module includes a fourth capacitor, and the fourth capacitor is connected in parallel to the signal input terminal of the converter circuit.
[0008] Optionally, the signal input terminals of the converter circuit include a positive signal input terminal and a negative signal input terminal; the bridge inverter module includes a first switching tube, a second switching tube, a third switching tube and a fourth switching tube; the first poles of the first switching tube and the third switching tube are both connected to the positive signal input terminal; the second pole of the first switching tube is connected to the first pole of the second switching tube to form the first output terminal of the bridge inverter module; the second pole of the third switching tube is connected to the first pole of the fourth switching tube to form the second output terminal of the bridge inverter module; the second poles of the second switching tube and the fourth switching tube are both connected to the negative signal input terminal.
[0009] Optionally, the resonant cavity includes a first capacitor, a first inductor, and a plurality of second inductors, where the number of the second inductors is the same as the number of transformers in the transformer module; one end of the first capacitor is connected to the first output end of the bridge inverter module, and the other end is connected in series with the first inductor and then connected to the same-named end of the primary winding of the transformer module; the second inductors are correspondingly connected in parallel across the two ends of the primary windings of the remaining transformers in the transformer module.
[0010] Optionally, the primary windings of all the transformers in each conversion circuit are connected in series to form a second connection branch, where the same-named end of the second connection branch is connected to the resonant cavity, and the different-named end of the second connection branch is connected to the second output end of the bridge inverter module.
[0011] Optionally, the signal input end of the converter circuit includes a positive signal input end and a negative signal input end; the rectification module includes a third diode, a fourth diode, a fifth diode, and a sixth diode; the anode of the third diode and the cathode of the fourth diode are connected to form the first input end of the rectification module, the cathode of the third diode is connected to the positive signal output end of the converter circuit, the anode of the fourth diode is connected to the negative signal output end of the converter circuit, and the first input end of the rectification module is connected to the same-named end of the first connection branch; the anode of the fifth diode and the cathode of the sixth diode are connected to form the second input end of the rectification module, the cathode of the fifth diode is connected to the positive signal output end of the converter circuit, the anode of the sixth diode is connected to the negative signal output end of the converter circuit, and the second input end of the rectification module is connected to the different-named end of the first connection branch.
[0012] In addition, to achieve the above object, the present application further provides a power module including the above converter circuit.
[0013] In addition, to achieve the above object, the present application further provides a charging module including the above power module.
[0014] A converter circuit, a power module, and a charging module provided in an embodiment of the present application are provided with a clamping circuit. When the oscillation voltage of the secondary windings of the transformers in the first connection branch exceeds the voltage of the first energy storage module, the oscillation is released to the first energy storage module through the clamping circuit, and then the voltage of the secondary windings of the transformers is clamped below the voltage of the first energy storage module, avoiding energy loss and bias voltage caused by out-of-control oscillation amplitude. Description of the Drawings
[0015] Figure 1 It is a structural block diagram of a converter circuit of the present application;
[0016] Figure 2 It is a structural schematic diagram of a converter circuit of the present application;
[0017] Figure 3 This is a schematic diagram of the working state of a converter circuit of the present application.
[0018] The realization of the purpose, functional features and advantages of the present application will be further described in conjunction with the embodiments with reference to the accompanying drawings. Specific Embodiments
[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.
[0020] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.
[0021] In the present invention, unless otherwise clearly defined and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.
[0022] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.
[0023] The first embodiment of the present application provides a converter circuit, Figure 1is a structural block diagram of a converter circuit, as Figure 1 shown. The converter circuit may include a multiplexing circuit 100. Each conversion circuit 100 may include a bridge inverter module 110, a resonant cavity 120, a voltage transformation module 130, a rectification module 140, a clamping circuit 150, and a first energy storage module 160. The input end of the bridge inverter module 110 is connected to the signal input end Vin of the converter circuit. The bridge inverter module 110 can be used to convert the DC voltage of the signal input end Vin of the converter circuit into an AC voltage signal. The resonant cavity 120 is connected to the output end of the bridge inverter module 110, and the resonant cavity can be used to shape the AC voltage signal. The two ends of the secondary winding of the voltage transformation module 130 are connected to the input end of the rectification module 140, and the voltage transformation module 130 can be used to adjust the shaped voltage signal to a preset voltage. Among them, the voltage transformation module 130 includes at least two transformers. In each of the multiple conversion circuits 100, the secondary winding of a transformer in any one conversion circuit 100 is connected in series with the secondary winding of a transformer in other conversion circuits 100 to form a first connection branch. The output end of the rectification module 140 is connected to the signal output end Vo of the converter circuit. The rectification module 140 can be used to limit the current of the output voltage of the voltage transformation module 130. One end of the clamping circuit 150 is connected in series to the first connection branch, and the other end is connected to the signal output end Vo of the converter circuit. The clamping circuit 150 can be used to clamp the voltage of the secondary winding of the transformer in the first connection branch. The first energy storage module 160 is connected in parallel to the signal output end Vo of the converter circuit, and the first energy storage module 160 is used to store the voltage output by the rectification module 140.
[0024] In this embodiment, the clamping circuit 150 is provided. When the oscillating voltage of the secondary windings of the transformers in the first connection branch exceeds the voltage of the first energy storage module 160, the oscillation is released to the first energy storage module 160 through the clamping circuit 150, and then the voltage of the secondary winding of the transformer is clamped below the voltage of the first energy storage module 160, avoiding energy loss and bias voltage caused by out-of-control oscillation amplitude.
[0025] In an exemplary embodiment, the primary windings of all the transformers in each conversion circuit are connected in series to form a second connection branch. Among them, the same-name ends of the second connection branch are connected to the resonant cavity 120, and the different-name ends of the second connection branch are connected to the bridge inverter module 110.
[0026] It should be noted that the number of secondary windings of the series-connected transformers can be any number greater than or equal to 2, such as 2, 3, 4... n. Preferably, the number of secondary windings of the series-connected transformers can be any even number greater than or equal to 2. The number of secondary windings of the series-connected transformers is the same as the number of conversion circuits 100. That is, when the number of secondary windings of the series-connected transformers is 2, the corresponding number of conversion circuits 100 is also 2. This embodiment is asFigure 2 Taking the two conversion circuits 100 shown as an example, the structure of the converter circuit will be specifically introduced. Figure 2 Among them, the two conversion circuits 100 are respectively a first conversion circuit and a second conversion circuit. Since the structures of the first conversion circuit and the second conversion circuit are the same, the converter circuit will be specifically described below taking the first conversion circuit as an example.
[0027] As Figure 2 shown, in the first conversion circuit, the voltage conversion module 130 includes a first transformer T1-1 and a second transformer T1-2. The primary windings of the first transformer T1-1 and the second transformer T1-2 are connected in series to form a second connection branch. The secondary winding of the first transformer T1-1 and the secondary winding of the third transformer T2-1 of the second conversion circuit are connected in series to form a first connection branch. The branch formed by combining this first connection branch with the corresponding rectification module 140 is used as a first branch M1; the secondary winding of the second transformer T1-2 and the secondary winding of the fourth transformer T2-2 of the second conversion circuit are connected in series to form another first connection branch. The branch formed by combining this first connection branch with the corresponding rectification module 140 is used as a second branch M2.
[0028] Since parasitic capacitance will be generated due to the too-close distance between wires during the winding process of the transformer or the filling layer between the upper and lower plates of the transformer PCB board, and the parasitic capacitance of each transformer (such as the first transformer T1-1 and the third transformer T2-1) may be different, this will cause the parasitic capacitance and the transformer inductance to be inconsistent. In the case of high-frequency voltage switching of the transformer, oscillation will occur, and the oscillation amplitude is relatively large. To suppress the above oscillation, a clamping circuit 150 is provided in this embodiment, and the clamping circuit 150 will be specifically introduced below.
[0029] The signal output terminal Vo of the converter circuit includes a positive signal output terminal Vo+ and a negative signal output terminal Vo-; the clamping circuit 150 includes a first clamping branch and a second clamping branch; one end of the first clamping branch is connected in series in the first connection branch, and the other end is connected to the positive signal output terminal Vo+; one end of the second clamping branch is connected in series in the first connection branch, and the other end is connected to the negative signal output terminal Vo-; wherein, the current flowing through the first clamping branch 150 is opposite in polarity to the current flowing through the second clamping branch.
[0030] In this embodiment, by setting the first clamping branch and the second clamping branch, since the parasitic capacitance generated by different transformers in the first connection branch is inconsistent with the inductance in parallel with the transformer, in the case of high-frequency voltage switching, the parasitic capacitance of each transformer will oscillate with the corresponding inductance, which will cause transformer heat loss and line loss, etc. By setting the first clamping branch and the second clamping branch, the oscillation energy is released in the first energy storage module 160, and thus resonance can be suppressed.
[0031] Exemplarily, continue to refer to Figure 2 , the signal output terminal Vo of the converter circuit includes a positive signal output terminal Vo+ and a negative signal output terminal Vo-; the clamping circuit 150 includes a first diode D1-1 and a second diode D1-2; the anode of the first diode D1-1 is connected in series to the first connection branch, and the cathode is connected to the positive signal output terminal Vo+. The first diode D1-1 can be used to clamp the voltage of the secondary winding of the transformer in the first connection branch when an overvoltage signal of a positive voltage is generated in the secondary winding of the voltage transformation module 130; the cathode of the second diode D1-2 is connected in series to the first connection branch, and the anode is connected to the negative signal output terminal Vo-. The second diode D1-2 can be used to clamp the voltage of the secondary winding of the transformer in the first connection branch when an overvoltage signal of a negative voltage is generated in the secondary winding of the voltage transformation module 130. The resonant cavity 120 includes a first capacitor C1, a first inductor L1, and a plurality of second inductors L2. The number of second inductors L2 is the same as the number of transformers in the voltage transformation module 130; one end of the first capacitor C1 is connected to the first output terminal N1 of the bridge inverter module 110, and the other end is connected in series with the first inductor L1 and then connected to the same-named end of the primary winding of the voltage transformation module 130; the second inductors L2 are correspondingly connected in parallel across the two ends of the primary windings of the remaining transformers in the voltage transformation module 130.
[0032] In an exemplary embodiment, the first energy storage module 160 includes a second capacitor C2, and the second capacitor C2 is connected in parallel to the signal output terminal Vo.
[0033] It should be noted that the connection point (i.e., the clamping point M) of the clamping circuit 150 and the first connection branch can be at the midpoint of the connection lines of the secondary windings of all the transformers in the first connection branch, so as to ensure the best clamping effect. For example, when the secondary windings of two transformers are connected in series to form the first connection branch, the connection point of the clamping circuit 150 is at the midpoint of the series connection of the two transformers. If the secondary windings of four transformers are connected in series, the connection point of the clamping circuit 150 is at the midpoint of the series connection of the four transformers.
[0034] In this embodiment, in the resonant cavity 120, the first capacitor C1 and the first inductor L1 resonate, thereby eliminating the harmonics of the square wave output by the bridge inverter module 110, and outputting a sinusoidal voltage signal and current signal to be transmitted to the voltage transformation module 130. In the voltage transformation module 130, when the parasitic capacitance generated by the first transformer T1-1 or the third transformer T2-1 is relatively large, it will resonate with the second inductor L2 to generate a relatively large amplitude resonance. By setting the first diode D1-1 and the second diode D1-2, the resonance can be suppressed. Specifically, as Figure 3As shown, the secondary windings of the first transformer T1-1 and the third transformer T2-1 (the primary winding of the third transformer T2-1 is not shown in the figure) are connected in series. Since the sum of the voltage V1 of the secondary winding of the first transformer T1-1 and the voltage V2 of the secondary winding of the third transformer T2-1 is clamped by the voltage of the second capacitor C2, but the parasitic capacitance generated in the first transformer T1-1 or the third transformer T2-1 is inconsistent with the second inductor L2. In the case of high-frequency voltage switching, the parasitic capacitances of the first transformer T1-1 and the third transformer T2-1 will oscillate with the corresponding second inductor L2, and the oscillation phases are opposite. The oscillation amplitude may be very large, resulting in transformer heat loss and line loss, etc.
[0035] For the above reasons, in this embodiment, the first diode D1-1 and the second diode D1-2 are provided. When the voltage at the signal input terminal Vin is a positive voltage, the voltage V1 of the secondary winding of the first transformer T1-1 or the voltage V2 of the secondary winding of the third transformer T2-1 is clamped at the positive bus terminal through the first diode D1-1. When the voltage at the signal input terminal Vin is a negative voltage, the voltage V1 of the secondary winding of the first transformer T1-1 or the voltage V2 of the secondary winding of the third transformer T2-1 is clamped at the negative bus terminal through the second diode D1-2. When the oscillation voltage of the secondary winding of the first transformer T1-1 or the oscillation voltage of the secondary winding of the third transformer T2-1 exceeds the second capacitor C2, the oscillation energy is released in the second capacitor C2 through the first diode D1-1 or the second diode D1-2, so that the maximum peak value of the oscillation amplitude of the secondary winding of the first transformer T1-1 or the third transformer T2-1 is converged, avoiding the out-of-control of the oscillation amplitude, and further reducing the heat loss and line loss of the first transformer T1-1 or the third transformer T2-1.
[0036] In an exemplary embodiment, continue to refer to Figure 2 , the signal output terminal Vo of the converter circuit includes a positive signal output terminal Vo+ and a negative signal output terminal Vo-. The converter circuit further includes a first switching switch 170 and a second switching switch 180. The first switching switch 170 is connected to the signal output terminal Vo of the converter circuit corresponding to the first connection branch. The first switching switch 170 is used to parallel the output terminals of two adjacent conversion circuits 100 under the action of a control signal. The second switching switch 180 is connected in series between the first energy storage modules 160 of each conversion circuit 100. The second switching switch 180 is used to series the output terminals of each conversion circuit 100 under the action of a control signal.
[0037] Exemplarily, the first switching switch 170 may include a first switch S1 and a second switch S2, and the second switching switch 180 may include a third switch S3.
[0038] Specifically, when it is necessary to connect the first branch M1 and the second branch M2 in parallel, the first switch S1 is closed to conduct the connection of the positive signal output terminals Vo+ of the first branch M1 and the second branch M2. The second switch S2 is closed to conduct the connection of the negative signal output terminals Vo- of the first branch M1 and the second branch M2. The second capacitor C2 is connected in parallel between the positive signal output terminal Vo+ and the negative signal output terminal Vo- of the first branch M1. Similarly, the third capacitor C3 of the second conversion circuit is connected in parallel between the positive signal output terminal Vo+ and the negative signal output terminal Vo- of the second branch M2. When it is necessary to connect the first branch M1 and the second branch M2 in series, the third switch S3 is closed to conduct the connection of the signal output terminal Vo of the first branch M1 and the signal input terminal Vin of the second branch M2. The second capacitor C2 and the third capacitor C3 are connected in series and then connected in parallel to the signal output terminal Vo of the first branch M1 or the second branch M2.
[0039] Continue to refer to Figure 2 , the signal input terminal Vin of the converter circuit includes a positive signal input terminal Vin+ and a negative signal input terminal Vin-. In the first conversion circuit, the bridge inverter module 110 includes a first switching tube Q1-1, a second switching tube Q1-2, a third switching tube Q1-3, and a fourth switching tube Q1-4. The first poles of the first switching tube Q1-1 and the third switching tube Q1-3 are both connected to the positive signal input terminal Vin+. The second pole of the first switching tube Q1-1 is connected to the first pole of the second switching tube Q1-2 to form the first output terminal N1 of the bridge inverter module 110. The second pole of the third switching tube Q1-3 is connected to the first pole of the fourth switching tube Q1-4 to form the second output terminal N2 of the bridge inverter module 110. The second poles of the second switching tube Q1-2 and the fourth switching tube Q1-4 are both connected to the negative signal input terminal Vin-. The primary windings of all the transformers in each conversion circuit are connected in series to form a second connection branch. Among them, the same-name ends of the second connection branch are connected to the resonant cavity 120, and the different-name ends of the second connection branch are connected to the second output terminal N2 of the bridge inverter module 110.
[0040] In this embodiment, the switching transistor can be a MOS transistor. And the first pole of the switching transistor can be the drain, for example, and the second pole can be the source, for example. On this basis, the drain of the first switching transistor Q1-1 is connected to the source of the second switching transistor Q1-2 to form a first arm, and the drain of the third switching transistor Q1-3 is connected to the source of the fourth switching transistor Q1-4 to form a second arm. The same-named ends of the second connection branch are connected to the first output terminal N1 through the first inductor L1 and the first capacitor C1, and the different-named ends of the second connection branch are connected to the second output terminal N2. When the first switching transistor Q1-1 and the fourth switching transistor Q1-4 are closed simultaneously, a positive voltage is applied to the second connection branch. When the second switching transistor Q1-2 and the third switching transistor Q1-3 are closed simultaneously, a negative voltage is applied to the second connection branch. By alternating the above two, the AC voltage is converted into a DC voltage, and then a voltage is induced in the corresponding secondary winding, thereby realizing voltage conversion. Of course, the first pole of the switching transistor can also be the source, and the second pole can be the drain, and these all fall within the protection scope of this application.
[0041] In an exemplary embodiment, continuing to refer to Figure 1 , the converter circuit further includes a second energy storage module 190. The second energy storage module 190 is connected in parallel across the bridge inverter module 110 and is used to write the voltage of the signal input terminal Vin.
[0042] Exemplarily, for example, the second energy storage module 190 can include a fourth capacitor C4. The fourth capacitor C4 is connected in parallel to the signal input terminal Vin of the converter circuit. The fourth capacitor C4 is used to write the voltage of the signal input terminal Vin and store energy during the conduction period of the bridge inverter module 110; during the off period of the bridge inverter module 110, it can provide energy for the circuit to maintain the normal operation of the circuit and reduce the current ripple of the input power supply.
[0043] In an exemplary embodiment, continuing to refer to Figure 2, the signal output terminal Vo of the converter circuit includes a positive signal output terminal Vo+ and a negative signal output terminal Vo-. In the first conversion circuit, the rectification module 140 includes a third diode D1-3, a fourth diode D1-4, a fifth diode D1-5, and a sixth diode D1-6; the anode of the third diode D1-3 and the cathode of the fourth diode D1-4 are connected to form the first input terminal N3 of the rectification module 140, the cathode of the third diode D1-3 is connected to the positive signal output terminal Vo+ of the converter circuit, the anode of the fourth diode D1-4 is connected to the negative signal output terminal Vo- of the converter circuit, and the first input terminal N3 of the rectification module 140 is connected to the same-named terminal of the first connection branch; the anode of the fifth diode D1-5 and the cathode of the sixth diode D1-6 are connected to form the second input terminal N4 of the rectification module 140; the cathode of the fifth diode D1-5 is connected to the positive signal output terminal of the converter circuit, the anode of the sixth diode D1-6 is connected to the negative signal output terminal of the converter circuit, and the second input terminal N4 of the rectification module 140 is connected to the different-named terminal of the first connection branch.
[0044] In this embodiment, when the voltage at the signal input terminal Vin is a positive voltage, after the voltage signal is output from the same-named terminal of the secondary winding of the first transformer T1-1, the third diode D1-3 converts the AC voltage signal into a DC voltage signal, and after voltage regulation, it is output or enters the sixth diode D1-6 through the second capacitor C2 (the second capacitor C2 and the third capacitor C3 when the first branch and the second branch are in parallel). The sixth diode D1-6 converts the DC voltage signal into an AC voltage signal, and after voltage regulation, it returns to the different-named terminal of the secondary winding of the third transformer T2-1. Similarly, when the voltage at the signal input terminal Vin is a positive voltage, after the voltage signal is output from the different-named terminal of the secondary winding of the third transformer T2-1, it passes through the fifth diode D1-5, the second capacitor C2, and the fourth diode D1-4 in sequence, and returns to the same-named terminal of the secondary winding of the first transformer T1-1.
[0045] In addition, on the basis of the above embodiments, the embodiment of the present application further provides a power module, which includes the converter circuit described in any embodiment of the present application.
[0046] Exemplarily, the power module can be an ACDC power conversion module, and the power module can be applied to DC charging piles, energy storage devices, etc.
[0047] It should be understood that the power module of the present application has the beneficial effects described in any of the above embodiments, and will not be elaborated here.
[0048] In addition, on the basis of the above embodiments, the embodiment of the present application further provides a charging module, which includes the power module described in any embodiment of the present application.
[0049] It should be understood that the charging module of the present application has the beneficial effects described in any of the above embodiments, and will not be elaborated herein.
[0050] The above are only the preferred embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the present application.
Claims
1. A converter circuit, characterized in that, It includes a plurality of parallel conversion circuits, and each conversion circuit includes a bridge inverter module, a resonant cavity, a voltage transformation module, a rectification module, a clamping circuit, and a first energy storage module; The input end of the bridge inverter module is connected to the signal input end of the converter circuit, and the bridge inverter module is used to convert the DC voltage at the signal input end of the converter circuit into an AC voltage signal; The resonant cavity is connected to the output end of the bridge inverter module, and the resonant cavity is used to shape the AC voltage signal; The primary winding of the voltage transformation module is connected to the resonant cavity and the bridge inverter module, and the two ends of the secondary winding of the voltage transformation module are connected to the input end of the rectification module. The voltage transformation module is used to adjust the shaped voltage signal to a preset voltage. Among them, the voltage transformation module includes at least two transformers. In each conversion circuit, the secondary winding of a transformer in any one conversion circuit is connected in series with the secondary winding of a transformer in other conversion circuits to form a first connection branch; The output end of the rectification module is connected to the signal output end of the converter circuit, and the rectification module is used to limit the current of the output voltage of the voltage transformation module; One end of the clamping circuit is connected in series to the first connection branch, and the other end is connected to the signal output end of the converter circuit. The clamping circuit is used to clamp the voltage of the secondary winding of the transformer in the first connection branch; The first energy storage module is connected in parallel to the signal output end of the converter circuit, and the first energy storage module is used to store the voltage output by the rectification module.
2. The converter circuit according to claim 1, characterized in that, The signal output end of the converter circuit includes a positive signal output end and a negative signal output end; the clamping circuit includes a first clamping branch and a second clamping branch; One end of the first clamping branch is connected in series to the first connection branch, and the other end is connected to the positive signal output end; One end of the second clamping branch is connected in series to the first connection branch, and the other end is connected to the negative signal output end; Among them, the current flowing through the first clamping branch is opposite in polarity to the current flowing through the second clamping branch.
3. The converter circuit according to claim 1, wherein, The signal output end of the converter circuit includes a positive signal output end and a negative signal output end; the clamping circuit includes a first diode and a second diode; The anode of the first diode is connected in series to the first connection branch, and the cathode is connected to the positive signal output end. The first diode is used to clamp the voltage of the secondary winding of the transformer in the first connection branch when an overvoltage signal with a positive voltage is generated in the secondary winding of the voltage transformation module; The cathode of the second diode is connected in series to the first connection branch, and the anode is connected to the negative signal output end. The second diode is used to clamp the voltage of the secondary winding of the transformer in the first connection branch when an overvoltage signal with a negative voltage is generated in the secondary winding of the voltage transformation module.
4. The converter circuit according to claim 1, characterized in that, The signal output end of the converter circuit includes a positive signal output end and a negative signal output end; the converter circuit further includes: The first switching switch is connected to the signal output end of the converter circuit corresponding to the first connection branch, and the first switching switch is used to parallel the output ends of two adjacent conversion circuits under the action of a control signal; The second switching switch is connected in series between the first energy storage modules of each conversion circuit, and the second switching switch is used to series the output ends of each conversion circuit under the action of a control signal; The second energy storage module is connected in parallel across the bridge inverter module and is used to write the voltage of the signal input end; The first energy storage module includes a second capacitor, and the second capacitor is connected in parallel at the signal output end; the second energy storage module includes a fourth capacitor, and the fourth capacitor is connected in parallel at the signal input end of the converter circuit.
5. The converter circuit according to claim 1, characterized in that, The signal input end of the converter circuit includes a positive signal input end and a negative signal input end; the bridge inverter module includes a first switching tube, a second switching tube, a third switching tube and a fourth switching tube; The first pole of the first switching tube and the first pole of the third switching tube are both connected to the positive signal input end; The second pole of the first switching tube is connected to the first pole of the second switching tube to form the first output end of the bridge inverter module; The second pole of the third switching tube is connected to the first pole of the fourth switching tube to form the second output end of the bridge inverter module; The second pole of the second switching tube and the second pole of the fourth switching tube are both connected to the negative signal input end.
6. The converter circuit according to claim 5, characterized in that The resonant cavity includes a first capacitor, a first inductor and a plurality of second inductors, and the number of the second inductors is the same as that of the transformers in the voltage conversion module; One end of the first capacitor is connected to the first output end of the bridge inverter module, and the other end is connected to the same-named end of the primary winding of the voltage conversion module after being connected in series with the first inductor; The second inductors are correspondingly connected in parallel across the two ends of the primary windings of the remaining transformers in the voltage conversion module.
7. The converter circuit according to claim 5, characterized in that, In each conversion circuit, the primary windings of all the transformers are connected in series to form a second connection branch, wherein the same-named end of the second connection branch is connected to the resonant cavity, and the different-named end of the second connection branch is connected to the second output end of the bridge inverter module.
8. The converter circuit according to claim 1, wherein The signal input end of the converter circuit includes a positive signal input end and a negative signal input end; the rectification module includes a third diode, a fourth diode, a fifth diode and a sixth diode; The anode of the third diode and the cathode of the fourth diode are connected to form the first input end of the rectification module, the cathode of the third diode is connected to the positive signal output end of the converter circuit, the anode of the fourth diode is connected to the negative signal output end of the converter circuit, and the first input end of the rectification module is connected to the same-named end of the first connection branch; The anode of the fifth diode and the cathode of the sixth diode are connected to form the second input end of the rectification module, the cathode of the fifth diode is connected to the positive signal output end of the converter circuit, the anode of the sixth diode is connected to the negative signal output end of the converter circuit, and the second input end of the rectification module is connected to the different-named end of the first connection branch.
9. A power module, comprising the converter circuit according to any one of claims 1-8.
10. A charging module, comprising the power module described in claim 9.