Full-wave rectification output circuit and three-phase resonant converter

Abstract

The utility model provides a full-wave rectification output circuit and a three-phase resonant converter. The circuit comprises a full-wave rectification module and a DC output module. The full-wave rectification module comprises multiple paths of full-wave rectification sub-modules, and the input end of each full-wave rectification sub-module is connected with voltage. The first output of each full-wave commutator module is connected with the first output of the DC output module, and the second output of each full-wave commutator module is connected with the second output of the DC output module. Each full-wave rectification sub-module is used for carrying out full-wave rectification on accessed voltage and outputting direct-current voltage after full-wave rectification to the direct-current output module; and the direct current output module is used for filtering the direct current voltage after full-wave rectification and then outputting the filtered direct current voltage, the number of diodes and the ripple amplitude are reduced through full-wave rectification, the loss of the diodes is reduced, and the rectification efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power electronics, in particular to a full-wave rectification output circuit and a three-phase resonant converter. BACKGROUND

[0002] When a full-bridge inductor-inductor-capacitor (LLC) resonant converter outputs full-bridge rectification, two full-bridge LLC rectification circuits are connected in series and in parallel. In the case of inconsistent resonant parameters of the two full-bridge LLCs, uneven voltage distribution occurs when connected in series, and uneven current distribution occurs when connected in parallel.

[0003] At present, in the LLC topology architecture, the problem of uneven voltage in series and uneven current in parallel is solved by interlacing connection of two full-bridge LLC rectification circuits. However, the number of full-bridge rectification diodes used in the LLC topology architecture is large, and the diode loss is large, which reduces the rectification efficiency and increases the risk of heat dissipation of the rectification diode. UTILITY MODEL CONTENT

[0004] The present application aims to solve the problems of large diode loss, low rectification efficiency, and high diode heat dissipation risk of the full-bridge LLC rectification circuit in the prior art.

[0005] To achieve the above-mentioned purpose, the technical solutions adopted by the embodiments of the present application are as follows:

[0006] In a first aspect, the embodiments of the present application provide a full-wave rectification output circuit, which comprises a full-wave rectification module and a direct current output module.

[0007] The full-wave rectification module comprises a plurality of full-wave rectification sub-modules, and the input end of each full-wave rectification sub-module is connected to a voltage.

[0008] The first output of each full-wave rectification sub-module is connected to a first output branch of the direct current output module, and the second output of each full-wave rectification sub-module is connected to a second output branch of the direct current output module.

[0009] Each full-wave rectification sub-module is configured to perform full-wave rectification on the connected voltage and output a full-wave rectified direct current voltage to the direct current output module.

[0010] The direct current output module is configured to filter and output the full-wave rectified direct current voltage.

[0011] As an optional implementation, the multi-channel full-wave rectifier submodule includes: at least one odd-channel full-wave rectifier submodule and at least one even-channel full-wave rectifier submodule, wherein each odd-channel full-wave rectifier submodule and each even-channel full-wave rectifier submodule includes: a first single-phase transformer, a second single-phase transformer, a third single-phase transformer, and each first rectifier unit and each second rectifier unit corresponding to each single-phase transformer;

[0012] The first terminals of the primary side of the first single-phase transformer, the second single-phase transformer, and the third single-phase transformer are respectively connected to the voltage of each phase, and the second terminal of the primary side of the first single-phase transformer is connected to the second terminal of the primary side of the second single-phase transformer and the second terminal of the primary side of the third single-phase transformer.

[0013] The first secondary side of each single-phase transformer is connected to the first terminal of the corresponding first rectifier unit, and the second secondary side of each single-phase transformer is connected to the first terminal of the corresponding second rectifier unit.

[0014] In each of the odd-numbered full-wave rectifier submodules, the second end of the first rectifier unit corresponding to the first single-phase transformer is connected to the second end of the second rectifier unit corresponding to the second single-phase transformer, the second end of the first rectifier unit corresponding to the third single-phase transformer, and the first end of the first output branch.

[0015] In each of the odd-numbered full-wave rectifier submodules, the second end of the second rectifier unit corresponding to the first single-phase transformer is connected to the second end of the first rectifier unit corresponding to the second single-phase transformer, the second end of the second rectifier unit corresponding to the third single-phase transformer, and the first end of the second output branch.

[0016] As an optional implementation, all of the single-phase transformers are center-tapped transformers;

[0017] In each of the odd-numbered full-wave rectifier submodules, the first center tap of the first single-phase transformer is connected to the second center tap of the second single-phase transformer, the first center tap of the third single-phase transformer, and the second end of the first output branch.

[0018] In each of the odd-numbered full-wave rectifier submodules, the second center tap of the first single-phase transformer is connected to the first center tap of the second single-phase transformer, the second center tap of the third single-phase transformer, and the second end of the second output branch.

[0019] As an optional implementation, in each of the even-numbered full-wave rectifier submodules, the second end of the second rectifier unit corresponding to the first single-phase transformer is connected to the second end of the first rectifier unit corresponding to the second single-phase transformer, the second end of the second rectifier unit corresponding to the third single-phase transformer, and the first end of the first output branch.

[0020] In each of the even-numbered full-wave rectifier submodules, the second end of the first rectifier unit corresponding to the first single-phase transformer is connected to the second end of the second rectifier unit corresponding to the second single-phase transformer, the second end of the first rectifier unit corresponding to the third single-phase transformer, and the first end of the second output branch.

[0021] As an optional implementation, in each even-numbered full-wave rectifier submodule, the second center tap of the first single-phase transformer is connected to the first center tap of the second single-phase transformer, the second center tap of the third single-phase transformer, and the second end of the first output branch.

[0022] In each of the even-numbered full-wave rectifier submodules, the first center tap of the first single-phase transformer is connected to the second center tap of the second single-phase transformer, the first center tap of the third single-phase transformer, and the second end of the second output branch.

[0023] As an optional implementation, each odd-numbered full-wave rectifier submodule and each even-numbered full-wave rectifier submodule also includes: a first capacitor and a second capacitor corresponding to each single-phase transformer;

[0024] The first terminal of the first capacitor is connected to the second terminal of the first rectifier unit, and the second terminal of the first capacitor is connected to the first center tap terminal of the corresponding single-phase transformer.

[0025] The first end of the second capacitor is connected to the second end of the second rectifier unit, and the second end of the second capacitor is connected to the second center tap of the corresponding single-phase transformer.

[0026] As an optional implementation, the first rectifier unit includes a first diode and a second diode; the second rectifier unit includes a third diode and a fourth diode;

[0027] The positive terminal of the first diode is connected to the first end of the first secondary side of the corresponding single-phase transformer, and the negative terminal of the first diode is connected to the negative terminal of the second diode and the first end of the first capacitor.

[0028] The positive terminal of the second diode is connected to the second end of the first secondary side of the corresponding single-phase transformer;

[0029] The positive terminal of the third diode is connected to the first terminal of the second secondary side of the corresponding three-phase transformer, and the negative terminal of the third diode is connected to the negative terminal of the fourth diode and the first terminal of the second capacitor.

[0030] The positive terminal of the fourth diode is connected to the second end of the second secondary side of the corresponding single-phase transformer.

[0031] As an optional implementation, the first output branch includes: at least one third capacitor;

[0032] The first terminal of the third capacitor is connected to the second terminal of the first rectifier unit corresponding to the first single-phase transformer of each odd-numbered full-wave rectifier submodule, the second terminal of the second rectifier unit corresponding to the second single-phase transformer, the second terminal of the first rectifier unit corresponding to the third single-phase transformer, and the second terminal of the second rectifier unit corresponding to the first single-phase transformer of each even-numbered full-wave rectifier submodule, the second terminal of the first rectifier unit corresponding to the second single-phase transformer, and the second terminal of the second rectifier unit corresponding to the third single-phase transformer.

[0033] The second terminal of the third capacitor is connected to the first center tap of the first single-phase transformer, the second center tap of the second single-phase transformer, the first center tap of the third single-phase transformer of each odd-numbered full-wave rectifier submodule, and the second center tap of the first single-phase transformer, the first center tap of the second single-phase transformer, and the second center tap of the third single-phase transformer of each even-numbered full-wave rectifier submodule.

[0034] As an optional implementation, the second output branch includes: at least one fourth capacitor;

[0035] The first terminal of the fourth capacitor is connected to the second terminal of the second rectifier unit corresponding to the first single-phase transformer of each odd-numbered full-wave rectifier submodule, the second terminal of the first rectifier unit corresponding to the second single-phase transformer, the second terminal of the second rectifier unit corresponding to the third single-phase transformer, and the second terminal of the first rectifier unit corresponding to the first single-phase transformer of each even-numbered full-wave rectifier submodule, the second terminal of the second rectifier unit corresponding to the second single-phase transformer, and the second terminal of the first rectifier unit corresponding to the third single-phase transformer.

[0036] The second terminal of the fourth capacitor is connected to the second center tap of the first single-phase transformer of each odd-numbered full-wave rectifier submodule, the first center tap of the second single-phase transformer, the second center tap of the third single-phase transformer, and the first center tap of the first single-phase transformer of each even-numbered full-wave rectifier submodule, the second center tap of the second single-phase transformer, and the first center tap of the third single-phase transformer.

[0037] Secondly, embodiments of this application provide a three-phase resonant converter, including the full-wave rectified output circuit described in the first aspect above.

[0038] The beneficial effects of this application are:

[0039] This application provides a full-wave rectifier output circuit and a three-phase resonant converter. The full-wave rectifier output circuit includes a full-wave rectifier module and a DC output module. The full-wave rectifier module includes multiple full-wave rectifier sub-modules. Each full-wave rectifier sub-module is used to perform full-wave rectification on the three-phase AC voltage input from the input terminal, and then provides a first full-wave rectified DC voltage to the first output branch of the DC output module through a first output, and provides a second full-wave rectified DC voltage to the second output branch of the DC output module through a second output. This allows the first and second output branches of the DC output module to filter the first and second full-wave rectified DC voltages respectively before outputting them. Full-wave rectification through each full-wave rectifier sub-module can reduce ripple amplitude and improve rectification efficiency. Attached Figure Description

[0040] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of the structure of the full-wave rectifier output circuit provided in the embodiments of this application;

[0042] Figure 2 This is another schematic diagram of the full-wave rectifier output circuit provided in an embodiment of this application.

[0043] Icons: Full-wave rectifier module: 1; DC output module: 2; Full-wave rectifier sub-module: 11; First output branch: 21; Second output branch: 22; Odd-numbered full-wave rectifier sub-module: 111; Even-numbered full-wave rectifier sub-module: 112; First single-phase transformer: TA; Second single-phase transformer: TB; Third single-phase transformer: TC; First rectifier unit: 113; Second rectifier unit: 114; First capacitor: C1; Second capacitor: C2; First diode: D1; Second diode: D2; Third diode: D3; Fourth diode: D4; Third capacitor: C3; Fourth capacitor: C4. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0045] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0046] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of this application, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0047] In the description of this application, unless otherwise expressly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0048] Currently, in the three-phase LLC topology, the series voltage imbalance and parallel current imbalance problems are mainly solved by interleaving two full-bridge LLC rectifier circuits. However, this method has drawbacks such as a large number of rectifier diodes, high diode losses, low rectification efficiency, and high heat dissipation risk of rectifier diodes.

[0049] Based on the aforementioned problems, this application proposes a full-wave rectifier output circuit. Each of the multiple full-wave rectifier submodules includes two full-wave rectified outputs. The first and second outputs of each full-wave rectifier submodule are connected to the first and second output branches of the DC output module, respectively. Furthermore, the multiple full-wave rectifier submodules are interleaved to avoid series voltage imbalance and parallel current imbalance problems. By performing full-wave rectification on the applied voltage, compared to full-bridge rectification, the number of diodes and ripple amplitude are reduced, diode losses and heat dissipation risks are lowered, and rectification efficiency is improved. Moreover, by expanding the multiple full-wave rectifier submodules, power capacity can be increased.

[0050] Figure 1 This is a schematic diagram of the structure of the full-wave rectifier output circuit provided in the embodiments of this application, as shown below. Figure 1 As shown, the full-wave rectifier output circuit includes: a full-wave rectifier module 1 and a DC output module 2.

[0051] Optionally, refer to Figure 1 The full-wave rectifier output circuit includes two modules: a full-wave rectifier module 1 and a DC output module 2. The full-wave rectifier module 1 is connected to both the three-phase AC mains power supply and the DC output module 2. The full-wave rectifier module 1 performs full-wave rectification of the input voltage and outputs it to the DC output module 2, which then filters the voltage before outputting it to the load. Figure 1 (Not shown in the image).

[0052] The full-wave rectifier module 1 includes multiple full-wave rectifier sub-modules 11, and the input terminals of each full-wave rectifier sub-module 11 are connected to voltage.

[0053] Optionally, continue to refer to Figure 1 The full-wave rectifier module 1 includes multiple full-wave rectifier submodules 11, and each full-wave rectifier submodule 11 includes an input terminal. Specifically, the input terminal of each full-wave rectifier submodule 11 is connected to a three-phase bridge to receive a three-phase AC voltage. Figure 1 As shown, the three-phase bridge converts the DC voltage on the DC bus Vbus into a three-phase AC voltage. The three-phase AC voltage can include phase A AC voltage, phase B AC voltage, and phase C AC voltage. The phase A AC voltage, phase B AC voltage, and phase C AC voltage have the same amplitude and the same frequency, but their phases differ from each other by 120°.

[0054] The first output of each full-wave rectifier submodule 11 is connected to the first output branch 21 of the DC output module 2, and the second output of each full-wave rectifier submodule 11 is connected to the second output branch 22 of the DC output module 2.

[0055] Optionally, continue to refer to Figure 1 Each full-wave rectifier submodule 11 also includes two outputs, namely a first output and a second output. Correspondingly, the DC output module 2 includes two output branches, namely a first output branch 21 and a second output branch 22. The first output of each full-wave rectifier submodule 11 is connected to the first output branch 21 of the DC output module 2, providing a first full-wave rectified output to the first output branch 21 of the DC output module 2. The second output of each full-wave rectifier submodule 11 is connected to the second output branch 22 of the DC output module 2, providing a second full-wave rectified output to the second output branch 22 of the DC output module 2.

[0056] For example, Figure 2The green portion visually represents the first output of each full-wave rectifier submodule 11 and the output of the first output branch 21 of the DC output module 2, while the yellow portion visually represents the second output of each full-wave rectifier submodule 11 and the output of the second output branch 22 of the DC output module 2.

[0057] Each full-wave rectifier submodule 11 is used to perform full-wave rectification on the input voltage and output the full-wave rectified DC voltage to the DC output module 2.

[0058] Optionally, each full-wave rectifier submodule 11 performs full-wave rectification on the input three-phase AC voltage to obtain a full-wave rectified DC voltage, which is then output to the DC output module 2. Specifically, the first full-wave rectified DC voltage is sent to the first output branch 21 of the DC output module 2 through the first output of each full-wave rectifier submodule 11. The second full-wave rectified DC voltage is sent to the second output branch 22 of the DC output module 2 through the second output of each full-wave rectifier submodule 11.

[0059] DC output module 2 is used to filter the DC voltage after full-wave rectification and then output it.

[0060] Optionally, the DC output module 2 filters the full-wave rectified DC voltage and outputs it to the load. Specifically, the first output branch 21 of the DC output module 2 filters the first full-wave rectified DC voltage and outputs it to the load, and the second output branch 22 of the DC output module 2 filters the second full-wave rectified DC voltage and outputs it to the load.

[0061] In this embodiment, the full-wave rectifier output circuit includes a full-wave rectifier module and a DC output module. The full-wave rectifier module includes multiple full-wave rectifier submodules. Each full-wave rectifier submodule is used to perform full-wave rectification on the three-phase AC voltage input from the input terminal, and then provides the first full-wave rectified DC voltage to the first output branch of the DC output module through a first output, and provides the second full-wave rectified DC voltage to the second output branch of the DC output module through a second output. This allows the first and second output branches of the DC output module to filter the first and second full-wave rectified DC voltages respectively before outputting them. The full-wave rectification performed by each full-wave rectifier submodule can reduce ripple amplitude and improve rectification efficiency.

[0062] Figure 2 Another schematic diagram of the full-wave rectifier output circuit provided in the embodiments of this application is shown below. Figure 2As shown, the multi-channel full-wave rectifier submodule 11 includes at least one odd-channel full-wave rectifier submodule 111 and at least one even-channel full-wave rectifier submodule 112. Each odd-channel full-wave rectifier submodule 111 and each even-channel full-wave rectifier submodule 112 includes a first single-phase transformer TA, a second single-phase transformer TB, a third single-phase transformer TC, and each first rectifier unit 113 and each second rectifier unit 114 corresponding to each single-phase transformer.

[0063] Optionally, refer to Figure 2 The multi-channel full-wave rectifier submodule 11 consists of at least one odd-channel full-wave rectifier submodule 111 and at least one even-channel full-wave rectifier submodule 112, with the odd-channel full-wave rectifier submodules 111 and even-channel full-wave rectifier submodules 112 interleaved. Figure 2 Taking the full-wave rectifier submodule 11, which includes an odd-numbered full-wave rectifier submodule 111 and an even-numbered full-wave rectifier submodule 112 as an example... Figure 2 The first full-wave rectifier submodule in the upper part is an odd-numbered full-wave rectifier submodule 111, and the second full-wave rectifier submodule in the lower part is an even-numbered full-wave rectifier submodule 112. Both the odd-numbered and even-numbered full-wave rectifier submodules 111 and 112 include a three-phase transformer and a corresponding rectifier unit. Specifically, the three-phase transformer includes a first single-phase transformer TA, a second single-phase transformer TB, and a third single-phase transformer TC. The three-phase transformer and the corresponding rectifier unit include a first rectifier unit 113 and a second rectifier unit 114 corresponding to each single-phase transformer. The three-phase transformer is used to transform the input three-phase AC voltage, providing a suitable three-phase AC voltage to the corresponding rectifier unit so that the corresponding rectifier unit can convert the three-phase AC voltage into DC voltage.

[0064] The first terminals of the primary windings of the first single-phase transformer TA, the second single-phase transformer TB, and the third single-phase transformer TC are respectively connected to the voltage of each phase. The second terminal of the primary winding of the first single-phase transformer TA is connected to the second terminal of the primary winding of the second single-phase transformer TB and the second terminal of the primary winding of the third single-phase transformer TC.

[0065] Optionally, continue to refer to Figure 2In a three-phase transformer, each single-phase transformer includes one primary side and two secondary sides. The first terminal of the primary side of each single-phase transformer is connected to the three-phase AC mains power supply, and the second terminals of the primary sides of each single-phase transformer are connected together. Specifically, the first terminals of the primary sides of the first single-phase transformer TA, the second single-phase transformer TB, and the third single-phase transformer TC are all connected to the three-phase AC mains power supply, respectively connected to phase A, phase B, and phase C voltages. The second terminal of the primary side of the first single-phase transformer TA is connected to the second terminals of the primary sides of the second single-phase transformer TB and the third single-phase transformer TC.

[0066] The first secondary side of each single-phase transformer is connected to the first end of the corresponding first rectifier unit 113, and the second secondary side of each single-phase transformer is connected to the first end of the corresponding second rectifier unit 114.

[0067] Optionally, continue to refer to Figure 2 The first secondary windings of the first single-phase transformer TA, the second single-phase transformer TB, and the third single-phase transformer TC are all connected to the first terminals of their respective first rectifier units 113. This allows each first rectifier unit 113 to convert the AC voltage output from the first secondary winding of its respective single-phase transformer into DC voltage. The second secondary windings of the first single-phase transformer TA, the second single-phase transformer TB, and the third single-phase transformer TC are all connected to the first terminals of their respective second rectifier units 114. This allows each second rectifier unit 114 to convert the AC voltage output from the second secondary winding of its respective single-phase transformer into DC voltage.

[0068] In each odd-numbered full-wave rectifier submodule 111, the second end of the first rectifier unit 113 corresponding to the first single-phase transformer TA is connected to the second end of the second rectifier unit 114 corresponding to the second single-phase transformer TB, the second end of the first rectifier unit 113 corresponding to the third single-phase transformer TC, and the first end of the first output branch 21.

[0069] Optionally, continue to refer to Figure 2 For the same single-phase transformer, differences in transformer parameters or resonant parameters may result in a first ratio for the output turns ratio between the primary and first secondary windings, and a second ratio for the output turns ratio between the primary and second secondary windings. Furthermore, the first ratio may not equal the second ratio, easily leading to series voltage imbalance and parallel current imbalance problems. For example, taking... Figure 2 Taking the first single-phase transformer TA as an example, the output turns ratio of the upper and lower halves of the primary side and the first secondary side is 2:1:1, while the output turns ratio of the upper and lower halves of the primary side and the second secondary side is 2:1.1:1.1.

[0070] Therefore, in each odd-numbered full-wave rectifier submodule 111, the second terminal of the first rectifier unit 113 corresponding to the first single-phase transformer TA is connected to the second terminal of the second rectifier unit 114 corresponding to the second single-phase transformer TB and the second terminal of the first rectifier unit 113 corresponding to the third single-phase transformer TC, respectively, and is connected to the first terminal of the first output branch 21 as the first output of each odd-numbered full-wave rectifier submodule 111. Since the output turns ratios of the first rectifier unit 113 corresponding to the first single-phase transformer TA and the first rectifier unit 113 corresponding to the third single-phase transformer TC are both the first ratio, while the output turns ratio of the second rectifier unit 114 corresponding to the second single-phase transformer TB is the second ratio, the above connection method can ensure that the voltage provided by each odd-numbered full-wave rectifier submodule 111 to the first terminal of the first output branch 21 has both the first ratio and the second ratio of output turns ratio, so as to solve the series uneven voltage and parallel uneven current problems existing in each odd-numbered full-wave rectifier submodule 111 at the first terminal of the first output branch 21.

[0071] In each odd-numbered full-wave rectifier submodule 111, the second end of the second rectifier unit 114 corresponding to the first single-phase transformer TA is connected to the second end of the first rectifier unit 113 corresponding to the second single-phase transformer TB, the second end of the second rectifier unit 114 corresponding to the third single-phase transformer TC, and the first end of the second output branch 22.

[0072] Optionally, continue to refer to Figure 2 Next, the series voltage imbalance and parallel current imbalance problems existing in the first terminal of the second output branch 22 of each odd-numbered full-wave rectifier submodule 111 are addressed. In each odd-numbered full-wave rectifier submodule 111, the second terminal of the second rectifier unit 114 corresponding to the first single-phase transformer TA is connected to the second terminal of the first rectifier unit 113 corresponding to the second single-phase transformer TB and the second terminal of the second rectifier unit 114 corresponding to the third single-phase transformer TC, respectively, and is connected to the first terminal of the second output branch 22 as the second output of each odd-numbered full-wave rectifier submodule 111. Since the output turns ratios of the second rectifier unit 114 corresponding to the first single-phase transformer TA and the second rectifier unit 114 corresponding to the third single-phase transformer TC are both the second ratio, while the output turns ratio of the first rectifier unit 113 corresponding to the second single-phase transformer TB is the first ratio, the above connection method can ensure that the voltage provided by each odd-numbered full-wave rectifier submodule 111 to the first end of the second output branch 22 has both the first ratio and the second ratio of output turns ratio, so as to solve the series uneven voltage and parallel uneven current problems of each odd-numbered full-wave rectifier submodule 111 at the first end of the second output branch 22.

[0073] In this embodiment, the multi-channel full-wave rectifier submodule consists of at least one odd-channel full-wave rectifier submodule and at least one even-channel full-wave rectifier submodule connected in an alternating manner. Each odd-channel and even-channel full-wave rectifier submodule includes a first single-phase transformer, a second single-phase transformer, a third single-phase transformer, and corresponding first and second rectifier units. The first terminal of the primary side of each single-phase transformer is connected to the three-phase AC mains power supply. The second terminals of the primary sides of each single-phase transformer are connected together to form a three-phase transformer. The first secondary side of each single-phase transformer is connected to the first terminal of the corresponding first rectifier unit, and the second secondary side of each single-phase transformer is connected to the first terminal of the corresponding second rectifier unit. This allows each first rectifier unit to convert the AC voltage output from the first secondary side of the corresponding single-phase transformer into DC voltage, and each second rectifier unit to convert the AC voltage output from the second secondary side of the corresponding single-phase transformer into DC voltage. In each odd-numbered full-wave rectifier submodule, the second terminal of the first rectifier unit corresponding to the first single-phase transformer is connected to the second terminal of the second rectifier unit corresponding to the second single-phase transformer and the second terminal of the first rectifier unit corresponding to the third single-phase transformer, respectively. This connection serves as the first output of each odd-numbered full-wave rectifier submodule and is connected to the first terminal of the first output branch. This addresses the series voltage imbalance and parallel current imbalance issues present in the first terminal of the first output branch for each odd-numbered full-wave rectifier submodule. Similarly, the second terminal of the second rectifier unit corresponding to the first single-phase transformer is connected to the second terminal of the first rectifier unit corresponding to the second single-phase transformer and the second terminal of the second rectifier unit corresponding to the third single-phase transformer, respectively. This connection serves as the second output of each odd-numbered full-wave rectifier submodule and is connected to the first terminal of the second output branch. This addresses the series voltage imbalance and parallel current imbalance issues present in the first terminal of the second output branch for each odd-numbered full-wave rectifier submodule.

[0074] As an optional implementation, each single-phase transformer is a center-tapped transformer.

[0075] Optionally, continue to refer to Figure 2 All single-phase transformers are center-tapped transformers. Each first center-tapped terminal is formed from the center tap on the first secondary side of each single-phase transformer, and each second center-tapped terminal is formed from the center tap on the second secondary side of each single-phase transformer. Each first center-tapped terminal divides the first secondary side into upper and lower parts, and each second center-tapped terminal divides the second secondary side into upper and lower parts.

[0076] In each odd-numbered full-wave rectifier submodule 111, the first center tap of the first single-phase transformer TA is connected to the second center tap of the second single-phase transformer TB, the first center tap of the third single-phase transformer TC, and the second end of the first output branch 21.

[0077] Optionally, continue to refer toFigure 2 Next, the series voltage imbalance and parallel current imbalance problems existing in the second terminal of the first output branch 21 of each odd-numbered full-wave rectifier submodule 111 are addressed. In each odd-numbered full-wave rectifier submodule 111, the first center tap terminal of the first single-phase transformer TA is connected to the second center tap terminal of the second single-phase transformer TB and the first center tap terminal of the third single-phase transformer TC, respectively, and is connected to the second terminal of the first output branch 21 as the first output of each odd-numbered full-wave rectifier submodule 111. Since the output turns ratios of the first center tap of the first single-phase transformer TA and the first center tap of the third single-phase transformer TC are both the first ratio, while the output turns ratio of the second center tap of the second single-phase transformer TB is the second ratio, the above connection method can ensure that the voltage supplied by each odd-numbered full-wave rectifier submodule 111 to the second terminal of the first output branch 21 has both the first ratio and the second ratio output turns ratio, so as to solve the series uneven voltage and parallel uneven current problems of each odd-numbered full-wave rectifier submodule 111 at the second terminal of the first output branch 21.

[0078] In each odd-numbered full-wave rectifier submodule 111, the second center tap of the first single-phase transformer TA is connected to the first center tap of the second single-phase transformer TB, the second center tap of the third single-phase transformer TC, and the second end of the second output branch 22.

[0079] Optionally, continue to refer to Figure 2 Next, the series voltage imbalance and parallel current imbalance problems existing in the second terminal of the second output branch 22 of each odd-numbered full-wave rectifier submodule 111 are addressed. In each odd-numbered full-wave rectifier submodule 111, the second center tap of the first single-phase transformer TA is connected to the first center tap of the second single-phase transformer TB and the second center tap of the third single-phase transformer TC, respectively, and is connected to the second terminal of the second output branch 22 as the second output of each odd-numbered full-wave rectifier submodule 111. Since the output turns ratio of the second center tap of the first single-phase transformer TA and the second center tap of the third single-phase transformer TC is the second ratio, and the output turns ratio of the first center tap of the second single-phase transformer TB is the first ratio, the above connection method can ensure that the voltage provided by each odd-numbered full-wave rectifier submodule 111 to the second terminal of the second output branch 22 has both the first ratio and the second ratio of output turns ratio, so as to solve the series uneven voltage and parallel uneven current problems of each odd-numbered full-wave rectifier submodule 111 at the second terminal of the second output branch 22.

[0080] In this embodiment, in each odd-numbered full-wave rectifier submodule, the first center tap of the first single-phase transformer is connected to the second center tap of the second single-phase transformer and the first center tap of the third single-phase transformer, respectively, and serves as the first output of each odd-numbered full-wave rectifier submodule, connected to the second end of the first output branch. This solves the series voltage imbalance and parallel current imbalance problems existing at the second end of the first output branch of each odd-numbered full-wave rectifier submodule. The second center tap of the first single-phase transformer is connected to the first center tap of the second single-phase transformer and the second center tap of the third single-phase transformer, respectively, and serves as the second output of each odd-numbered full-wave rectifier submodule, connected to the second end of the second output branch 22. This solves the series voltage imbalance and parallel current imbalance problems existing at the second end of the second output branch of each odd-numbered full-wave rectifier submodule.

[0081] As an optional implementation, in each even-numbered full-wave rectifier submodule 112, the second end of the second rectifier unit 114 corresponding to the first single-phase transformer TA is connected to the second end of the first rectifier unit 113 corresponding to the second single-phase transformer TB, the second end of the second rectifier unit 114 corresponding to the third single-phase transformer TC, and the first end of the first output branch 21.

[0082] Optionally, continue to refer to Figure 2 Next, the series voltage imbalance and parallel current imbalance problems existing in the first terminal of the first output branch 21 of each even-numbered full-wave rectifier submodule 112 are addressed. In each even-numbered full-wave rectifier submodule 112, the second terminal of the second rectifier unit 114 corresponding to the first single-phase transformer TA is connected to the second terminal of the first rectifier unit 113 corresponding to the second single-phase transformer TB and the second terminal of the second rectifier unit 114 corresponding to the third single-phase transformer TC, respectively, and is connected to the first terminal of the first output branch 21 as the first output of each even-numbered full-wave rectifier submodule 112. Since the output turns ratios of the second rectifier unit 114 corresponding to the first single-phase transformer TA and the second rectifier unit 114 corresponding to the third single-phase transformer TC are both the second ratio, while the output turns ratio of the first rectifier unit 113 corresponding to the second single-phase transformer TB is the first ratio, the above connection method can ensure that the voltage provided by each even-numbered full-wave rectifier submodule 112 to the first terminal of the first output branch 21 has both the first ratio and the second ratio of output turns ratio, so as to solve the series uneven voltage and parallel uneven current problems existing in each even-numbered full-wave rectifier submodule 112 at the first terminal of the first output branch 21.

[0083] In each even-numbered full-wave rectifier submodule 112, the second end of the first rectifier unit 113 corresponding to the first single-phase transformer TA is connected to the second end of the second rectifier unit 114 corresponding to the second single-phase transformer TB, the second end of the first rectifier unit 113 corresponding to the third single-phase transformer TC, and the first end of the second output branch 22.

[0084] Optionally, continue to refer to Figure 2 Next, the series voltage imbalance and parallel current imbalance problems existing in the first terminal of the second output branch 22 of each even-numbered full-wave rectifier submodule 112 are addressed. In each even-numbered full-wave rectifier submodule 112, the second terminal of the first rectifier unit 113 corresponding to the first single-phase transformer TA is connected to the second terminal of the second rectifier unit 114 corresponding to the second single-phase transformer TB and the second terminal of the first rectifier unit 113 corresponding to the third single-phase transformer TC, respectively, and is connected to the first terminal of the second output branch 22 as the second output of each even-numbered full-wave rectifier submodule 112. Since the output turns ratios of the first rectifier unit 113 corresponding to the first single-phase transformer TA and the first rectifier unit corresponding to the third single-phase transformer TC are both the first ratio, while the output turns ratio of the second rectifier unit 114 corresponding to the second single-phase transformer TB is the second ratio, the above connection method can ensure that the voltage provided by each even-numbered full-wave rectifier submodule 112 to the first end of the second output branch 22 has both the first ratio and the second ratio of output turns ratio, so as to solve the series uneven voltage and parallel uneven current problems of each even-numbered full-wave rectifier submodule 112 at the first end of the second output branch 22.

[0085] In this embodiment, in each even-numbered full-wave rectifier submodule, the second terminal of the second rectifier unit corresponding to the first single-phase transformer is connected to the second terminal of the first rectifier unit corresponding to the second single-phase transformer and the second terminal of the second rectifier unit corresponding to the third single-phase transformer, respectively, and serves as the first output of each even-numbered full-wave rectifier submodule connected to the first terminal of the first output branch. This solves the series voltage imbalance and parallel current imbalance problems existing in the first terminal of the first output branch of each even-numbered full-wave rectifier submodule. The second terminal of the first rectifier unit corresponding to the first single-phase transformer is connected to the second terminal of the second rectifier unit corresponding to the second single-phase transformer and the second terminal of the first rectifier unit corresponding to the third single-phase transformer, respectively, and serves as the second output of each even-numbered full-wave rectifier submodule connected to the first terminal of the second output branch. This solves the series voltage imbalance and parallel current imbalance problems existing in the first terminal of the second output branch of each even-numbered full-wave rectifier submodule.

[0086] As an optional implementation, in each even-numbered full-wave rectifier submodule 112, the second center tap of the first single-phase transformer TA is connected to the first center tap of the second single-phase transformer TB, the second center tap of the third single-phase transformer TC, and the second end of the first output branch 21.

[0087] Optionally, continue to refer to Figure 2 Next, the series voltage imbalance and parallel current imbalance problems existing at the second end of the first output branch 21 of each even-numbered full-wave rectifier submodule 112 are addressed. In each even-numbered full-wave rectifier submodule 112, the second center tap of the first single-phase transformer TA is connected to the first center tap of the second single-phase transformer TB and the second center tap of the third single-phase transformer TC, respectively, and is connected to the second end of the first output branch 21 as the first output of each even-numbered full-wave rectifier submodule 112. Since the output turns ratios of the second center tap of the first single-phase transformer TA and the second center tap of the third single-phase transformer TC are both the second ratio, while the output turns ratio of the first center tap of the second single-phase transformer TB is the first ratio, the above connection method can ensure that the voltage supplied by each even-numbered full-wave rectifier submodule 112 to the second terminal of the first output branch 21 has both the first ratio and the second ratio output turns ratio, so as to solve the series uneven voltage and parallel uneven current problems of each even-numbered full-wave rectifier submodule 112 at the second terminal of the first output branch 21.

[0088] In each even-numbered full-wave rectifier submodule 112, the first center tap of the first single-phase transformer TA is connected to the second center tap of the second single-phase transformer TB, the first center tap of the third single-phase transformer TC, and the second end of the second output branch 22.

[0089] Optionally, continue to refer to Figure 2Next, the series voltage imbalance and parallel current imbalance problems existing at the second terminal of the second output branch 22 of each even-numbered full-wave rectifier submodule 112 are addressed. In each even-numbered full-wave rectifier submodule 112, the first center tap of the first single-phase transformer TA is connected to the second center tap of the second single-phase transformer TB and the first center tap of the third single-phase transformer TC, respectively, and connected to the second terminal of the second output branch 22 as the second output of each even-numbered full-wave rectifier submodule 112. Since the output turns ratios of the first center tap of the first single-phase transformer TA and the first center tap of the third single-phase transformer TC are both the first ratio, while the output turns ratio of the second center tap of the second single-phase transformer TB is the second ratio, the above connection method can ensure that the voltage supplied by each even-numbered full-wave rectifier submodule 112 to the second terminal of the second output branch 22 has both the first ratio and the second ratio output turns ratio, so as to solve the series uneven voltage and parallel uneven current problems of each even-numbered full-wave rectifier submodule 112 at the second terminal of the second output branch 22.

[0090] In this embodiment, in each even-numbered full-wave rectifier submodule, the second center tap of the first single-phase transformer is connected to the first center tap of the second single-phase transformer and the second center tap of the third single-phase transformer, respectively, and serves as the first output of each even-numbered full-wave rectifier submodule, connected to the second end of the first output branch. This solves the series voltage imbalance and parallel current imbalance problems existing at the second end of the first output branch of each even-numbered full-wave rectifier submodule. The first center tap of the first single-phase transformer is connected to the second center tap of the second single-phase transformer and the first center tap of the third single-phase transformer, respectively, and serves as the second output of each even-numbered full-wave rectifier submodule, connected to the second end of the second output branch. This solves the series voltage imbalance and parallel current imbalance problems existing at the second end of the second output branch of each even-numbered full-wave rectifier submodule.

[0091] As an optional implementation, each odd-numbered full-wave rectifier submodule 111 and each even-numbered full-wave rectifier submodule 112 further includes: a first capacitor C1 and a second capacitor C2 corresponding to each single-phase transformer.

[0092] Optionally, continue to refer to Figure 2 Both the odd-numbered full-wave rectifier submodules 111 and the even-numbered full-wave rectifier submodules 112 include a first capacitor C1 and a second capacitor C2 corresponding to each single-phase transformer. The first capacitor C1 and the second capacitor C2 are supporting capacitors used to support each DC voltage.

[0093] The first terminal of the first capacitor C1 is connected to the second terminal of the first rectifier unit 113, and the second terminal of the first capacitor C1 is connected to the first center tap terminal of the corresponding single-phase transformer.

[0094] Optionally, continue to refer to Figure 2 For any single-phase transformer, the first terminal of the corresponding first capacitor C1 is connected to the second terminal of the first rectifier unit 113 corresponding to the single-phase transformer, and the second terminal of the first capacitor C1 is connected to the first center tap terminal of the single-phase transformer.

[0095] The first end of the second capacitor C2 is connected to the second end of the second rectifier unit 114, and the second end of the second capacitor C2 is connected to the second center tap of the corresponding single-phase transformer.

[0096] Optionally, continue to refer to Figure 2 For any single-phase transformer, the first end of the corresponding second capacitor C2 is connected to the second end of the second rectifier unit 114 corresponding to the single-phase transformer, and the second end of the second capacitor C2 is connected to the second center tap of the single-phase transformer.

[0097] In this embodiment, each full-wave rectifier submodule includes a first capacitor and a second capacitor corresponding to each single-phase transformer. The first terminal of the first capacitor is connected to the second terminal of the first rectifier unit, and the second terminal of the first capacitor is connected to the first center tap terminal of the corresponding single-phase transformer. The first terminal of the second capacitor is connected to the second terminal of the second rectifier unit, and the second terminal of the second capacitor is connected to the second center tap terminal of the corresponding single-phase transformer. By introducing the first and second capacitors corresponding to each single-phase transformer, the rectified voltages can be supported.

[0098] As an optional implementation, the first rectifier unit 113 includes a first diode D1 and a second diode D2; the second rectifier unit 114 includes a third diode D3 and a fourth diode D4.

[0099] Optionally, continue to refer to Figure 2 Each single-phase transformer's corresponding first rectifier unit 113 includes a first diode D1 and a second diode D2. Each single-phase transformer's corresponding second rectifier unit 114 includes a third diode D3 and a fourth diode D4. Each first diode D1, each second diode D2, each third diode D3, and each fourth diode D4 is a rectifier diode used to convert AC voltage to DC voltage.

[0100] The anode of the first diode D1 is connected to the first terminal of the first secondary winding of the corresponding single-phase transformer. The cathode of the first diode D1 is connected to the cathode of the second diode D2 and the first terminal of the first capacitor C1. The anode of the second diode D2 is connected to the second terminal of the first secondary winding of the corresponding single-phase transformer.

[0101] Optionally, continue to refer to Figure 2For any single-phase transformer, the anode of the first diode D1 in the corresponding first rectifier unit 113 is connected to the first terminal of the first secondary side of the single-phase transformer. The cathode of the first diode D1 is connected to the cathode of the second diode D2 and the first terminal of the first capacitor C1 corresponding to the single-phase transformer. The anode of the second diode D2 is connected to the second terminal of the first secondary side of the single-phase transformer.

[0102] The anode of the third diode D3 is connected to the first terminal of the second secondary winding of the corresponding three-phase transformer, and the cathode of the third diode D3 is connected to the cathode of the fourth diode D4 and the first terminal of the second capacitor C2. The anode of the fourth diode D4 is connected to the second terminal of the second secondary winding of the corresponding single-phase transformer.

[0103] Optionally, continue to refer to Figure 2 For any single-phase transformer, the anode of the third diode D3 in the corresponding second rectifier unit 114 is connected to the first terminal of the second secondary side of the single-phase transformer. The cathode of the third diode D3 is connected to the cathode of the fourth diode D4 and the first terminal of the second capacitor C2 corresponding to the single-phase transformer. The anode of the fourth diode D4 is connected to the second terminal of the second secondary side of the single-phase transformer.

[0104] It is worth noting that, since the single-phase transformer is a center-tapped transformer, using the above connection method, only two rectifier diodes are needed in one rectifier unit during center-tapped full-wave rectification. Compared with the four rectifier diodes required for full-bridge rectification, this greatly reduces the number of rectifier diodes, thereby reducing the losses of rectifier diodes and reducing the heat dissipation risk of rectifier diodes.

[0105] In this embodiment, each first rectifier unit corresponding to a single-phase transformer includes a first diode and a second diode, and each second rectifier unit corresponding to a single-phase transformer includes a third diode and a fourth diode. The anode of the first diode is connected to the first terminal of the first secondary side of the corresponding single-phase transformer, and the cathode of the first diode is connected to the cathode of the second diode and the first terminal of the first capacitor. The anode of the second diode is connected to the second terminal of the first secondary side of the corresponding single-phase transformer. The anode of the third diode is connected to the first terminal of the second secondary side of the corresponding three-phase transformer, and the cathode of the third diode is connected to the cathode of the fourth diode and the first terminal of the second capacitor. The anode of the fourth diode is connected to the second terminal of the second secondary side of the corresponding single-phase transformer. In center-tapped full-wave rectification, only two rectifier diodes are needed per rectifier unit, significantly reducing the number of rectifier diodes and lowering diode losses and heat dissipation risks.

[0106] As an optional implementation, the first output branch 21 includes at least one third capacitor C3.

[0107] Optionally, continue to refer toFigure 2 The first output branch 21 includes at least one third capacitor C3, which is a filter capacitor used to filter the DC voltage provided by the first output of each full-wave rectifier submodule 111 before outputting it.

[0108] The first terminal of the third capacitor C3 is connected to the second terminal of the first rectifier unit 113 corresponding to the first single-phase transformer TA of each odd-numbered full-wave rectifier submodule 111, the second terminal of the second rectifier unit 114 corresponding to the second single-phase transformer TB, the second terminal of the first rectifier unit 113 corresponding to the third single-phase transformer TC, and the second terminal of the second rectifier unit 114 corresponding to the first single-phase transformer TA of each even-numbered full-wave rectifier submodule 112, the second terminal of the first rectifier unit 113 corresponding to the second single-phase transformer TB, and the second terminal of the second rectifier unit 114 corresponding to the third single-phase transformer TC.

[0109] Optionally, continue to refer to Figure 2 The first terminal of the third capacitor C3 serves as the first terminal of the first output branch 21, and is connected to the second terminal of the first rectifier unit 113 corresponding to the first single-phase transformer TA in each odd-numbered full-wave rectifier submodule 111, the second terminal of the second rectifier unit 114 corresponding to the second single-phase transformer TB, and the second terminal of the first rectifier unit 113 corresponding to the third single-phase transformer TC, as well as the second terminal of the second rectifier unit 114 corresponding to the first single-phase transformer TA, the second terminal of the first rectifier unit 113 corresponding to the second single-phase transformer TB, and the second terminal of the second rectifier unit 114 corresponding to the third single-phase transformer TC in each even-numbered full-wave rectifier submodule 112. This ensures that the first terminal of the third capacitor C3 includes a DC voltage with the first and second proportional output turns ratios, avoiding series voltage imbalance and parallel current imbalance problems at the first terminal of the first output branch 21.

[0110] The second terminal of the third capacitor C3 is connected to the first center tap of the first single-phase transformer TA, the second center tap of the second single-phase transformer TB, and the first center tap of the third single-phase transformer TC of each odd-numbered full-wave rectifier submodule 111, as well as the second center tap of the first single-phase transformer TA, the first center tap of the second single-phase transformer TB, and the second center tap of the third single-phase transformer TC of each even-numbered full-wave rectifier submodule 112.

[0111] Optionally, continue to refer to Figure 2The second terminal of the third capacitor C3 serves as the second terminal of the first output branch 21, and is connected to the first center tap of the first single-phase transformer TA, the second center tap of the second single-phase transformer TB, and the first center tap of the third single-phase transformer TC of each odd-numbered full-wave rectifier submodule 111, and the second center tap of the first single-phase transformer TA, the second single-phase transformer TB, and the third single-phase transformer TC of each even-numbered full-wave rectifier submodule 112. This ensures that the second terminal of the third capacitor C3 includes a DC voltage with the first and second proportional output turns ratios, avoiding series voltage imbalance and parallel current imbalance problems at the second terminal of the first output branch 21.

[0112] In this embodiment, at least one third capacitor is provided in the first output branch to filter the DC voltage provided by the first output of each full-wave rectifier submodule before output. The first terminal of the third capacitor is connected to the second terminals of the first rectifier units corresponding to the first single-phase transformers of each odd-numbered full-wave rectifier submodule, the second terminals of the second rectifier units corresponding to the second single-phase transformers of each odd-numbered full-wave rectifier submodule, and the second terminals of the second rectifier units corresponding to the first single-phase transformers of each even-numbered full-wave rectifier submodule. The second terminal of the third capacitor is connected to the first center tap of the first single-phase transformer of each odd-numbered full-wave rectifier submodule, the second center tap of the second single-phase transformer of each odd-numbered full-wave rectifier submodule, and the second center tap of the first single-phase transformer of each even-numbered full-wave rectifier submodule. This avoids series voltage imbalance and parallel current imbalance problems at both ends of the first output branch.

[0113] As an optional implementation, the second output branch 22 includes at least one fourth capacitor C4.

[0114] Optionally, continue to refer to Figure 2 The second output branch 22 includes at least one fourth capacitor C4, which is a filter capacitor used to filter the DC voltage provided by the second output of each full-wave rectifier submodule 111 before outputting it.

[0115] The first terminal of the fourth capacitor C4 is connected to the second terminal of the second rectifier unit 114 corresponding to the first single-phase transformer TA of each odd-numbered full-wave rectifier submodule 111, the second terminal of the first rectifier unit 113 corresponding to the second single-phase transformer TB, the second terminal of the second rectifier unit 114 corresponding to the third single-phase transformer TC, and the second terminal of the first rectifier unit 113 corresponding to the first single-phase transformer TA of each even-numbered full-wave rectifier submodule 112, the second terminal of the second rectifier unit 114 corresponding to the second single-phase transformer TB, and the second terminal of the first rectifier unit 113 corresponding to the third single-phase transformer TC.

[0116] Optionally, continue to refer to Figure 2 The first terminal of the fourth capacitor C4 serves as the first terminal of the second output branch 22, and is connected to the second terminal of the second rectifier unit 114 corresponding to the first single-phase transformer TA of each odd-numbered full-wave rectifier submodule 111, the second terminal of the first rectifier unit 113 corresponding to the second single-phase transformer TB, and the second terminal of the second rectifier unit 114 corresponding to the third single-phase transformer TC, as well as the second terminal of the first rectifier unit 113 corresponding to the first single-phase transformer TA of each even-numbered full-wave rectifier submodule 112, the second terminal of the second rectifier unit 114 corresponding to the second single-phase transformer TB, and the second terminal of the first rectifier unit 113 corresponding to the third single-phase transformer TC. This ensures that the first terminal of the fourth capacitor C4 includes a DC voltage with the first and second proportional output turns ratios, avoiding series voltage imbalance and parallel current imbalance problems at the first terminal of the second output branch 22.

[0117] The second terminal of the fourth capacitor C4 is connected to the second center tap of the first single-phase transformer TA, the first center tap of the second single-phase transformer TB, and the second center tap of the third single-phase transformer TC of each odd-numbered full-wave rectifier submodule 111, as well as the first center tap of the first single-phase transformer TA, the second center tap of the second single-phase transformer TB, and the first center tap of the third single-phase transformer TC of each even-numbered full-wave rectifier submodule 112.

[0118] Optionally, continue to refer to Figure 2 Figure 2 Figure 2 Figure 2 Figure 2 Figure 2 Figure 2 Figure 2 Figure 2 Figure 2 Figure 2 Figure 2 Figure 2 Figure 2 Figure 2 Figure 2 Figure 2 Figure 2 Figure 2 Figure 2 Figure 2 The second terminal of the fourth capacitor C4 serves as the second terminal of the second output branch 22, and is connected to the second center tap of the first single-phase transformer TA, the first center tap of the second single-phase transformer TB, and the second center tap of the third single-phase transformer TC of each odd-numbered full-wave rectifier submodule 111, as well as the first center tap of the first single-phase transformer TA, the second single-phase transformer TB, and the third single-phase transformer TC of each even-numbered full-wave rectifier submodule 112. This ensures that the second terminal of the fourth capacitor C4 includes a DC voltage with the first and second proportional output turns ratios, avoiding series voltage imbalance and parallel current imbalance problems at the second terminal of the second output branch 22.

[0119] In this embodiment, at least one fourth capacitor is provided in the second output branch to filter the DC voltage provided by the second output of each full-wave rectifier submodule before output. The first terminal of the fourth capacitor is connected to the second terminal of the second rectifier unit corresponding to the first single-phase transformer of each odd-numbered full-wave rectifier submodule, the second terminal of the first rectifier unit corresponding to the second single-phase transformer of the second single-phase transformer of the second single-phase transformer of the third single-phase transformer of the second output branch, and the second terminal of the first rectifier unit corresponding to the first single-phase transformer of the first single-phase transformer of the second single-phase transformer of the second output branch, the second terminal of the second single-phase transformer of the second single-phase transformer of the third single-phase transformer of the second output branch, and the second terminal of the second single-phase transformer of the second output branch. The second terminal of the fourth capacitor is connected to the second center tap of the first single-phase transformer of each odd-numbered full-wave rectifier submodule, the first center tap of the first single-phase transformer of the second single-phase transformer of the second single-phase transformer of the third single-phase transformer of the third single-phase transformer of the second output branch, and the first center tap of the first single-phase transformer of the second single-phase transformer of the second output branch, the second center tap of the second single-phase transformer of the second output branch, and the first center tap of the second single-phase transformer of the second output branch. This avoids series voltage imbalance and parallel current imbalance problems at both ends of the second output branch.

[0120] This application also proposes a three-phase resonant converter, including the full-wave rectified output circuit described in the foregoing embodiments.

[0121] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A full-wave rectifier output circuit, characterized in that, include: Full-wave rectifier module and DC output module; The full-wave rectifier module includes multiple full-wave rectifier sub-modules, and the input terminal of each full-wave rectifier sub-module is connected to a voltage. The first output of each full-wave rectifier submodule is connected to the first output branch of the DC output module, and the second output of each full-wave rectifier submodule is connected to the second output branch of the DC output module; Each of the full-wave rectifier submodules is used to perform full-wave rectification on the input voltage and output the full-wave rectified DC voltage to the DC output module; The DC output module is used to filter the DC voltage after full-wave rectification and then output it.

2. The circuit according to claim 1, characterized in that, The multi-channel full-wave rectifier submodule includes: at least one odd-channel full-wave rectifier submodule and at least one even-channel full-wave rectifier submodule. Each odd-channel full-wave rectifier submodule and each even-channel full-wave rectifier submodule includes: a first single-phase transformer, a second single-phase transformer, a third single-phase transformer, and each first rectifier unit and each second rectifier unit corresponding to each single-phase transformer. The first terminals of the primary side of the first single-phase transformer, the second single-phase transformer, and the third single-phase transformer are respectively connected to the voltage of each phase, and the second terminal of the primary side of the first single-phase transformer is connected to the second terminal of the primary side of the second single-phase transformer and the second terminal of the primary side of the third single-phase transformer. The first secondary side of each single-phase transformer is connected to the first terminal of the corresponding first rectifier unit, and the second secondary side of each single-phase transformer is connected to the first terminal of the corresponding second rectifier unit. In each of the odd-numbered full-wave rectifier submodules, the second end of the first rectifier unit corresponding to the first single-phase transformer is connected to the second end of the second rectifier unit corresponding to the second single-phase transformer, the second end of the first rectifier unit corresponding to the third single-phase transformer, and the first end of the first output branch. In each of the odd-numbered full-wave rectifier submodules, the second end of the second rectifier unit corresponding to the first single-phase transformer is connected to the second end of the first rectifier unit corresponding to the second single-phase transformer, the second end of the second rectifier unit corresponding to the third single-phase transformer, and the first end of the second output branch.

3. The circuit according to claim 2, characterized in that, All of the single-phase transformers mentioned are center-tapped transformers; In each of the odd-numbered full-wave rectifier submodules, the first center tap of the first single-phase transformer is connected to the second center tap of the second single-phase transformer, the first center tap of the third single-phase transformer, and the second end of the first output branch. In each of the odd-numbered full-wave rectifier submodules, the second center tap of the first single-phase transformer is connected to the first center tap of the second single-phase transformer, the second center tap of the third single-phase transformer, and the second end of the second output branch.

4. The circuit according to claim 2, characterized in that, In each of the even-numbered full-wave rectifier submodules, the second end of the second rectifier unit corresponding to the first single-phase transformer is connected to the second end of the first rectifier unit corresponding to the second single-phase transformer, the second end of the second rectifier unit corresponding to the third single-phase transformer, and the first end of the first output branch. In each of the even-numbered full-wave rectifier submodules, the second end of the first rectifier unit corresponding to the first single-phase transformer is connected to the second end of the second rectifier unit corresponding to the second single-phase transformer, the second end of the first rectifier unit corresponding to the third single-phase transformer, and the first end of the second output branch.

5. The circuit according to claim 3, characterized in that, In each even-numbered full-wave rectifier submodule, the second center tap of the first single-phase transformer is connected to the first center tap of the second single-phase transformer, the second center tap of the third single-phase transformer, and the second end of the first output branch. In each of the even-numbered full-wave rectifier submodules, the first center tap of the first single-phase transformer is connected to the second center tap of the second single-phase transformer, the first center tap of the third single-phase transformer, and the second end of the second output branch.

6. The circuit according to claim 3, characterized in that, Each odd-numbered full-wave rectifier submodule and each even-numbered full-wave rectifier submodule also includes: a first capacitor and a second capacitor corresponding to each single-phase transformer; The first terminal of the first capacitor is connected to the second terminal of the first rectifier unit, and the second terminal of the first capacitor is connected to the first center tap terminal of the corresponding single-phase transformer. The first end of the second capacitor is connected to the second end of the second rectifier unit, and the second end of the second capacitor is connected to the second center tap of the corresponding single-phase transformer.

7. The circuit according to claim 2, characterized in that, The first rectifier unit includes a first diode and a second diode; the second rectifier unit includes a third diode and a fourth diode; The positive terminal of the first diode is connected to the first end of the first secondary side of the corresponding single-phase transformer, and the negative terminal of the first diode is connected to the negative terminal of the second diode and the first end of the first capacitor. The positive terminal of the second diode is connected to the second end of the first secondary side of the corresponding single-phase transformer; The positive terminal of the third diode is connected to the first terminal of the second secondary side of the corresponding three-phase transformer, and the negative terminal of the third diode is connected to the negative terminal of the fourth diode and the first terminal of the second capacitor. The positive terminal of the fourth diode is connected to the second end of the second secondary side of the corresponding single-phase transformer.

8. The circuit according to any one of claims 2-5, characterized in that, The first output branch includes: at least one third capacitor; The first terminal of the third capacitor is connected to the second terminal of the first rectifier unit corresponding to the first single-phase transformer of each odd-numbered full-wave rectifier submodule, the second terminal of the second rectifier unit corresponding to the second single-phase transformer, the second terminal of the first rectifier unit corresponding to the third single-phase transformer, and the second terminal of the second rectifier unit corresponding to the first single-phase transformer of each even-numbered full-wave rectifier submodule, the second terminal of the first rectifier unit corresponding to the second single-phase transformer, and the second terminal of the second rectifier unit corresponding to the third single-phase transformer. The second terminal of the third capacitor is connected to the first center tap of the first single-phase transformer, the second center tap of the second single-phase transformer, the first center tap of the third single-phase transformer of each odd-numbered full-wave rectifier submodule, and the second center tap of the first single-phase transformer, the first center tap of the second single-phase transformer, and the second center tap of the third single-phase transformer of each even-numbered full-wave rectifier submodule.

9. The circuit according to any one of claims 2-5, characterized in that, The second output branch includes: at least one fourth capacitor; The first terminal of the fourth capacitor is connected to the second terminal of the second rectifier unit corresponding to the first single-phase transformer of each odd-numbered full-wave rectifier submodule, the second terminal of the first rectifier unit corresponding to the second single-phase transformer, the second terminal of the second rectifier unit corresponding to the third single-phase transformer, and the second terminal of the first rectifier unit corresponding to the first single-phase transformer of each even-numbered full-wave rectifier submodule, the second terminal of the second rectifier unit corresponding to the second single-phase transformer, and the second terminal of the first rectifier unit corresponding to the third single-phase transformer. The second terminal of the fourth capacitor is connected to the second center tap of the first single-phase transformer of each odd-numbered full-wave rectifier submodule, the first center tap of the second single-phase transformer, the second center tap of the third single-phase transformer, and the first center tap of the first single-phase transformer of each even-numbered full-wave rectifier submodule, the second center tap of the second single-phase transformer, and the first center tap of the third single-phase transformer.

10. A three-phase resonant converter, characterized in that, include: The full-wave rectified output circuit according to any one of claims 1-9.

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