Multi-ac source bridge rectifier circuit and output characteristic adjusting method thereof

Abstract

The application relates to a multi-AC source bridge rectifier circuit and an output characteristic adjusting method thereof, wherein the rectifier circuit comprises at least one main power module, at least one slave power module and at least one inductance branch module. The main power module, the power module and the inductance branch module have multiple forms, and the main power module and the slave power module can independently complete electric energy conversion. The main power module and the slave power module are associated by the inductance branch module to work cooperatively, so that the adjusting means of the whole circuit output power is diversified, and the adjustable property of the output characteristic of the whole circuit is increased.

Description

Technical Field

[0001] This invention relates to rectifier circuits, and more particularly to bridge rectifier circuits with multiple input sources. Background Technology

[0002] A rectifier circuit is a circuit that converts alternating current (AC) into direct current (DC) and is widely used in industries such as power, transportation, metallurgy, petroleum, and chemicals. Among them, the bridge rectifier circuit is a common type of rectifier circuit, characterized by high transformer utilization and a relatively large number of required rectifier components.

[0003] With the development of new energy power generation technologies, AC power sources have become increasingly diverse, including not only traditional thermal, hydroelectric, and nuclear power generators, but also wind, solar thermal, tidal, and hydrogen power generators. Multi-input source rectifier circuits have the ability to comprehensively utilize various AC power sources. Currently, most common multi-input source rectifier circuits adopt a "single-phase multi-source" form. That is, a multi-input source rectifier circuit consists of multiple identical and independent single-input source sub-rectifier circuits, with each sub-rectifier circuit having independent input terminals but parallel output terminals. Summary of the Invention

[0004] The "single-phase multi-stage" rectifier circuit has a simple structure, with each sub-rectifier circuit operating independently and exhibiting only a simple decoupling relationship with each other. However, this characteristic of "each sub-rectifier circuit having the same structure and operating independently" sacrifices the possibility of each sub-rectifier circuit working together.

[0005] To overcome the lack of coordination among the sub-rectifier circuits in existing "single-phase multi-phase" rectifier circuits, this invention proposes a multi-AC source bridge rectifier circuit, which also includes a method for adjusting its output characteristics to further improve its performance.

[0006] According to an embodiment of the present invention, a multi-AC source bridge rectifier circuit includes a main power module, a slave power module, and an inductor branch module. The main power module includes: a first transformer, whose primary winding has two ports for connection to a first AC power source, and whose secondary winding has two ports, respectively, a first intermediate port and a second intermediate port of the main power module; a first diode, whose cathode is connected to the first intermediate port of the main power module, and whose anode is connected to the negative terminal of a DC bus or the second terminal of a load; a second diode, whose cathode is connected to the second intermediate port of the main power module, and whose anode is connected to the negative terminal of a DC bus or the second terminal of a load; a third diode, whose anode is connected to the first intermediate port of the main power module; a fourth diode, whose anode is connected to the second intermediate port of the main power module; and a first inductor, one end of which is connected to the cathodes of the third and fourth diodes, and the other end of which is connected to the positive terminal of a DC bus or the first terminal of a load. The power module includes: a second transformer, whose primary winding has two ports for connection to a second AC power source, and whose secondary winding has two ports, respectively, a first intermediate port and a second intermediate port of the power module; a fifth diode, whose cathode is connected to the first intermediate port of the power module, and whose anode is connected to the negative terminal of the DC bus or the second terminal of the load; a sixth diode, whose cathode is connected to the second intermediate port of the power module, and whose anode is connected to the negative terminal of the DC bus or the second terminal of the load; a seventh diode, whose anode is connected to the first intermediate port of the power module; an eighth diode, whose anode is connected to the second intermediate port of the power module; and a second inductor, one end of which is connected to the cathodes of the seventh and eighth diodes, and the other end of which is connected to the positive terminal of the DC bus or the first terminal of the load. The inductor branch module includes at least one inductor branch, wherein: the inductor branch includes an inductor and a diode, and has a current input terminal and a current output terminal, the current input terminal being connected to the first intermediate port or the second intermediate port of the main power module, and the current output terminal being connected to the first intermediate port or the second intermediate port of the slave power module.

[0007] Embodiments of the present invention also provide a multi-AC source bridge rectifier circuit, including a main power module, a slave power module, and an inductor branch module. The main power module includes: a first transformer, whose primary winding has two ports for connection to a first AC power source, and whose secondary winding has two ports, respectively, a first intermediate port and a second intermediate port of the main power module; a first diode, whose anode is connected to the first intermediate port of the main power module, and whose cathode is connected to the positive terminal of the DC bus or the first terminal of the load; a second diode, whose anode is connected to the second intermediate port of the main power module, and whose cathode is connected to the positive terminal of the DC bus or the first terminal of the load; a third diode, whose cathode is connected to the first intermediate port of the main power module; a fourth diode, whose cathode is connected to the second intermediate port of the main power module; and a first inductor, one end of which is connected to the anodes of the third and fourth diodes, and the other end of which is connected to the negative terminal of the DC bus or the second terminal of the load. The power module includes: a second transformer, whose primary winding has two ports for connection to a second AC power source, and whose secondary winding has two ports, respectively, a first intermediate port and a second intermediate port of the power module; a fifth diode, whose cathode is connected to the first intermediate port of the power module, and whose anode is connected to the negative terminal of the DC bus or the second terminal of the load; a sixth diode, whose cathode is connected to the second intermediate port of the power module, and whose anode is connected to the negative terminal of the DC bus or the second terminal of the load; a seventh diode, whose anode is connected to the first intermediate port of the power module; an eighth diode, whose anode is connected to the second intermediate port of the power module; and a second inductor, one end of which is connected to the cathodes of the seventh and eighth diodes, and the other end of which is connected to the positive terminal of the DC bus or the first terminal of the load. The inductor branch module includes at least one inductor branch, wherein: the inductor branch includes an inductor and a diode, and has a current input terminal and a current output terminal, the current input terminal being connected to the first intermediate port or the second intermediate port of the main power module, and the current output terminal being connected to the first intermediate port or the second intermediate port of the slave power module.

[0008] This invention further provides a multi-AC source bridge rectifier circuit, including a main power module, a slave power module, and an inductor branch module. The main power module includes: a first transformer, whose primary winding has two ports connected to a first AC power source, and whose secondary winding has two ports, respectively, a first intermediate port and a second intermediate port of the main power module; a first diode, whose cathode is connected to the first intermediate port of the main power module, and whose anode is connected to the negative terminal of the DC bus or the second terminal of the load; a second diode, whose cathode is connected to the second intermediate port of the main power module, and whose anode is connected to the negative terminal of the DC bus or the second terminal of the load; a third diode, whose anode is connected to the first intermediate port of the main power module; a fourth diode, whose anode is connected to the second intermediate port of the main power module; and a first inductor, one end of which is connected to the cathodes of the third and fourth diodes, and the other end of which is connected to the positive terminal of the DC bus or the first terminal of the load. The power module includes: a second transformer, whose primary winding has two ports for connection to a second AC power source, and whose secondary winding has two ports, respectively, a first intermediate port and a second intermediate port of the power module; a fifth diode, whose anode is connected to the first intermediate port of the power module, and whose cathode is connected to the positive terminal of the DC bus or the first terminal of the load; a sixth diode, whose anode is connected to the second intermediate port of the power module, and whose cathode is connected to the positive terminal of the DC bus or the first terminal of the load; a seventh diode, whose cathode is connected to the first intermediate port of the power module; an eighth diode, whose cathode is connected to the second intermediate port of the power module; and a second inductor, one end of which is connected to the anodes of the seventh and eighth diodes, and the other end of which is connected to the negative terminal of the DC bus or the second terminal of the load. The inductor branch module includes at least one inductor branch, wherein: the inductor branch includes an inductor and a diode, and has a current input terminal and a current output terminal, the current input terminal being connected to the first intermediate port or the second intermediate port of the main power module, and the current output terminal being connected to the first intermediate port or the second intermediate port of the slave power module.

[0009] Embodiments of the present invention further provide a multi-AC source bridge rectifier circuit, including a main power module, a slave power module, and an inductor branch module. The main power module includes: a first transformer, whose primary winding has two ports for connection to a first AC power source, and whose secondary winding has two ports, respectively, a first intermediate port and a second intermediate port of the main power module; a first diode, whose anode is connected to the first intermediate port of the main power module, and whose cathode is connected to the positive terminal of the DC bus or the first terminal of the load; a second diode, whose anode is connected to the second intermediate port of the main power module, and whose cathode is connected to the positive terminal of the DC bus or the first terminal of the load; a third diode, whose cathode is connected to the first intermediate port of the main power module; a fourth diode, whose cathode is connected to the second intermediate port of the main power module; and a first inductor, one end of which is connected to the anodes of the third and fourth diodes, and the other end of which is connected to the negative terminal of the DC bus or the second terminal of the load. The power module includes: a second transformer, whose primary winding has two ports for connection to a second AC power source, and whose secondary winding has two ports, respectively, a first intermediate port and a second intermediate port of the power module; a fifth diode, whose anode is connected to the first intermediate port of the power module, and whose cathode is connected to the positive terminal of the DC bus or the first terminal of the load; a sixth diode, whose anode is connected to the second intermediate port of the power module, and whose cathode is connected to the positive terminal of the DC bus or the first terminal of the load; a seventh diode, whose cathode is connected to the first intermediate port of the power module; an eighth diode, whose cathode is connected to the second intermediate port of the power module; and a second inductor, one end of which is connected to the anodes of the seventh and eighth diodes, and the other end of which is connected to the negative terminal of the DC bus or the second terminal of the load. The inductor branch module includes at least one inductor branch, wherein: the inductor branch includes an inductor and a diode, and has a current input terminal and a current output terminal, the current input terminal being connected to the first intermediate port or the second intermediate port of the main power module, and the current output terminal being connected to the first intermediate port or the second intermediate port of the slave power module.

[0010] Based on the above structure, there are at least 16 possible combinations of the most basic unit of the multi-AC source bridge rectifier circuit, namely "1 main power module + 1 slave power module + 1 inductor branch module". Based on this basic unit, a composite structure of "multiple main power modules + multiple slave power modules + multiple inductor branch modules" can be further realized, including combinations of one main power module connected to multiple inductor branch modules, one slave power module connected to multiple inductor branch modules, and combinations of different basic units.

[0011] In some embodiments, some or all of the diodes described above can be replaced by controllable switching devices (e.g., synchronous rectifier MOSFETs). The AC power supply can be a three-level or higher multi-level AC power supply, including a sinusoidal AC power supply. The AC power supplies can be from the same source or different sources.

[0012] This invention also provides a method for adjusting the output characteristics of the aforementioned multi-AC source bridge rectifier circuit, comprising any combination of the following steps:

[0013] Step 1: Increase or decrease the number of inductor branch modules;

[0014] Step 2: Increase or decrease the number of inductor branches in the inductor branch module;

[0015] Step 3: Change the inductance value of the inductor in the inductor branch module;

[0016] Step 4: Change the operating parameters of the first AC power supply connected to the main power module, such as amplitude, frequency, period, phase, level, pulse width, etc.

[0017] Step 5: Change the operating parameters of the second AC power supply connected to the power module, such as amplitude, frequency, period, phase, level, pulse width, etc.

[0018] The beneficial effects of this invention are mainly reflected in the following: Compared with the existing "single-phase multi-phase" bridge rectifier circuit, the multi-AC source bridge rectifier circuit according to the embodiments of this invention includes a main power module, a slave power module, and an inductor branch module. The main power module and the slave power module can each independently complete power conversion, while the inductor branch module connects the main power module and the slave power module. The additional current flowing through the main power module and the slave power module makes the adjustment of the rectifier circuit's output characteristics more diversified. That is, changing the number of inductor branch modules, changing the number of inductor branches within an inductor branch module, and changing the operating parameters of the AC power supply can all change the rectifier circuit's output value, improving the adjustability of the rectifier circuit's output characteristics. Attached Figure Description

[0019] Figure 1 This is a circuit diagram of Embodiment 1 of the present invention.

[0020] Figure 2 This is the output power characteristic diagram of Embodiment 1 of the present invention.

[0021] Figure 3 This is a circuit diagram of Embodiment 2 of the present invention.

[0022] Figure 4 This is the output power characteristic diagram of Embodiment 2 of the present invention.

[0023] Figure 5This is the output current ripple characteristic diagram of Embodiment 2 of the present invention.

[0024] Figure 6 This is a circuit diagram of Embodiment 3 of the present invention.

[0025] Figure 7 This is a circuit diagram of Embodiment 4 of the present invention.

[0026] Figure 8 This is the output power characteristic diagram of Embodiment 4 of the present invention.

[0027] Figure 9 This is the output current ripple characteristic diagram of Embodiment 4 of the present invention. Detailed Implementation

[0028] The present invention will now be further described with reference to the accompanying drawings. It should be noted that the embodiments described herein are for illustrative purposes only and are not intended to limit the invention. In the following description, numerous specific details are set forth to facilitate a thorough understanding of the invention. However, those skilled in the art will understand that these specific details are not essential for carrying out the invention. Furthermore, in some embodiments, well-known circuits, materials, or methods are not specifically described to avoid obscuring the invention.

[0029] Throughout this specification, references to "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in connection with that embodiment or example is included in at least one embodiment of the invention. Therefore, the phrases "in an embodiment," "in an embodiment," "an example," or "an example" appearing in various places throughout the specification do not necessarily refer to the same embodiment or example. Furthermore, specific features, structures, or characteristics can be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. Moreover, those skilled in the art will understand that the accompanying drawings provided herein are for illustrative purposes, with the same reference numerals indicating the same elements. It should be understood that when an element is referred to as "connected to" or "coupled" to another element, it can be a direct connection or coupling to the other element, or there may be intermediate elements present.

[0030] Example 1

[0031] refer to Figure 1 A multi-AC source bridge rectifier circuit includes at least one main power module, at least one slave power module, and at least one inductor branch module. In some embodiments, the rectifier circuit includes multiple main power modules, multiple slave power modules, and multiple inductor branch modules, which may have the same structure or different structures. Specifically, one main power module is M1, one slave power module is S1, and one inductor branch module is C1.

[0032] The main power module M1 includes a transformer T. 1A Diode D 1A Diode D 1B Diode D 1C Diode D 1D and inductor L S1A Transformer T 1A Its primary winding has two ports connected to the AC power supply V. AC1 Connected, its secondary winding has two ports, intermediate ports 1_A and 1_B; diode D 1A Its cathode is connected to the first intermediate port 1_A of M1, and its anode is connected to the negative terminal V of the DC bus. o - Or connected to the second terminal of the load; diode D 1B Its cathode is connected to the second intermediate port 1_B of M1, and its anode is connected to the negative terminal V of the DC bus. o - Or connected to the second terminal of the load; diode D 1C Its anode is connected to the first intermediate port 1_A of M1, and its cathode is connected to the inductor L. S1A One end is connected; diode D 1D Its anode is connected to the second intermediate port 1_B of M1, and its cathode is connected to the inductor L. S1A One end is connected; inductor L S1A The other end is connected to the positive terminal V of the DC bus. o + Or connect to the first end of the load.

[0033] The power module S1 includes a transformer T 1a Diode D 1a Diode D 1b Diode D 1c Diode D 1d and inductor L s1a Transformer T 1a Its primary winding has two ports connected to the AC power supply V. ac1 Connected, its secondary winding has two ports, intermediate ports 1_a and 1_b; diode D 1a Its cathode is connected to the first intermediate port 1_a of S1, and its anode is connected to the negative terminal V of the DC bus. o - Or connected to the second terminal of the load; diode D 1b Its cathode is connected to the second intermediate port 1_b of S1, and its anode is connected to the negative terminal V of the DC bus. o - Or connected to the second terminal of the load; diode D 1c Its anode is connected to the first intermediate port 1_a of S1, and its cathode is connected to the inductor L.s1a One end is connected; diode D 1d Its anode is connected to the second intermediate port 1_b of S1, and its cathode is connected to the inductor L. s1a One end is connected; inductor L s1a The other end is connected to the positive terminal V of the DC bus. o + Or connect to the first end of the load.

[0034] The inductor branch module C1 includes four inductor branches. The first inductor branch is an inductor L. a1 and diode D a1 Formed in series, inductor L a1 One end is connected to the first intermediate port 1_A of M1, and the inductor L a1 The other end is connected to diode D a1 The anode of diode D is connected. a1 The cathode is connected to the first intermediate port 1_a of S1; the second inductor branch is connected to inductor L. b1 and diode D b1 Formed in series, inductor L b1 One end is connected to the first intermediate port 1_A of M1, and the inductor L b1 The other end is connected to diode D b1 The anode of diode D is connected. b1 The cathode is connected to the second intermediate port 1_b of S1; the third inductor branch is connected to inductor L. c1 and diode D c1 Formed in series, inductor L c1 One end is connected to the second intermediate port 1_B of M1, and the inductor L c1 The other end is connected to diode D c1 The anode of diode D is connected. c1 The cathode is connected to the first intermediate port 1_a of S1; the fourth inductor branch is connected to inductor L. d1 and diode D d1 Formed in series, inductor L d1 One end is connected to the second intermediate port 1_B of M1, and the inductor L d1 The other end is connected to diode D d1 The anode of diode D is connected. d1 The cathode is connected to the second intermediate port 1_b of S1. The function of the diode in the inductor branch is to limit the direction of current and prevent circulating current. The number of inductor branches in C1 is variable, ranging from 0 to 4.

[0035] For ease of understanding, Figure 1 Only a portion of the entire multi-AC source bridge rectifier circuit is shown—the main power module M1, the slave power module S1, and the inductor branch module C1. Figure 1Taking the displayed portion as an example, we will introduce the steady-state operation of the master / slave power module and the inductor branch module. When the master / slave power module operates independently, it is a typical full-bridge rectification process, so it will not be described in detail.

[0036] For simplicity, assume that the main power module M1 and the slave power module S1 use the same components, and the transformer T 1A The first port of the primary winding (e.g., connected to AC power supply V) AC1 The positive terminal and the first port 1_A of the secondary winding are related as identical terminals. Transformer T 1a The first port of the primary winding (e.g., connected to AC power supply V) ac1 The positive terminal and the first port 1_a of the secondary winding are related as identical terminals; AC power supply V AC1 A three-level AC power supply (+V) AC1 , 0, -V AC1 AC power supply V ac1 =A·v AC1 (A is a constant), i.e., v AC1 and v ac1 The frequency, period, phase, and pulse width are the same, but the amplitude or level values ​​are different. This will be illustrated using A<1 as an example. Figure 1 One operating cycle T1 of the circuit shown can be divided into 4 stages, and a typical operating condition is as follows:

[0037] (1) Stage 1: v AC1 =+V AC1

[0038] In main power module M1: D 1B and D 1C Conduction, D 1A and D 1D As of now, (a)v AC1 via T 1A With D 1C L S1A DC bus or load, D 1B This forms the first loop;

[0039] From power module S1: D 1c Conduction, D 1a D 1b and D 1d Deadline;

[0040] In inductor branch module C1: D a1 and D b1 Conduction, D d1 As of now, (b)v AC1 via T 1A With L a1 D a1 D1c L s1a DC bus or load, D 1B This forms the second loop; (c)v AC1 via T 1A v ac1 via T 1a With L b1 D b1 D 1c L s1a DC bus and load, D 1B This forms the third loop; (d)D c1 Conduct until L c1 D c1 D 1c L s1a DC bus or load, D 1B The current i in the fourth loop formed c1 It is zero.

[0041] (2) Stage 2: v AC1 =0

[0042] In main power module M1: D 1A D 1B D 1C and D 1D Conduction, (a)L S1A DC bus or load, D 1A D 1C (b)L forms the first loop; S1A DC bus or load, D 1B D 1D This forms the second loop;

[0043] From power module S1: D 1c and D 1d Conduction, D 1a and D 1b Deadline;

[0044] In inductor branch module C1: D a1 and D b1 Conduction, D c1 and D d1 Deadline;

[0045] At this time, T 1A Secondary side and T 1a The secondary side is essentially a short circuit, and the current i flowing through the first inductor branch is... a1 and the current i flowing through the second inductor branch b1 All by D 1c and D 1d and D 1A and D 1B Share the burden.

[0046] (3) Stage 3: v AC1 =-V AC1

[0047] In main power module M1: D 1A and D 1D Conduction, D 1B and D 1C As of now, (a)v AC1 via T 1A With D 1D L S1A DC bus or load, D 1A This forms the first loop;

[0048] From power module S1: D 1d Conduction, D 1a D 1b and D 1c Deadline;

[0049] In inductor branch module C1: D c1 and D d1 Conduction, D a1 As of now, (b)v AC1 via T 1A v ac1 via T 1a With L c1 D c1 D 1d L s1a DC bus and load, D 1A This forms the second loop; (c)v AC1 via T 1A With L d1 D d1 D 1d L s1a DC bus or load, D 1A This forms the third loop; (d)D b1 Conduct until L b1 D b1 D 1d L s1a DC bus or load, D 1A The current i in the fourth loop formed b1 It is zero.

[0050] (4) Stage 4: v AC1 =0

[0051] In main power module M1: D 1A D 1B D 1C and D 1D Conduction, (a)LS1A DC bus or load, D 1A D 1C (b)L forms the first loop; S1A DC bus or load, D 1B D 1D This forms the second loop;

[0052] From power module S1: D 1c and D 1d Conduction, D 1a and D 1b Deadline;

[0053] In inductor branch module C1: D c1 and D d1 Conduction, D a1 and D b1 Deadline;

[0054] At this time, T 1A Secondary side and T 1a The secondary side is essentially a short circuit, and the current i flowing through the third inductor branch is... c1 and the current i flowing through the fourth inductor branch d1 All by D 1c and D 1d and D 1A and D 1B Share the burden.

[0055] As can be seen from the above working process, when the main power module M1, the slave power module S1 and the inductor branch module C1 work together, they can either independently or jointly convert the electrical energy of the two AC power sources and supply it to the DC bus or the load.

[0056] The operation of inductor branches C1 with 1 to 3 inductors is similar to that described above and will not be repeated. To better understand the impact of inductor branch module C1 on the output characteristics (mainly output power) of the entire multi-AC source bridge rectifier circuit, assume: V AC1 =20V, v AC1 The period T1 = 90 μs, v AC1 +V AC1 Pulse width is T1 / 4, v AC1 -V AC1 The pulse width is also T1 / 4, T 1A and T 1a The primary and secondary turns ratios are both 1:2, the coupling coefficient is 0.999, and the DC bus voltage V o =20V. Let's take three cases for further explanation: Case 1: A = 0.5V; Case 2: A = 0.75V; Case 3: A = 1V.

[0057] Take L a1 =L b1=L c1 =L d1 =L S1A =L s1a =300μH, Figure 2 The output power performance of Embodiment 1 of the present invention is given under the above three conditions. Figure 2 It can be seen that (i) the presence or absence of inductor branch module C1 ("absence" is equivalent to the case where the number of its internal inductor branches is 0) affects the output power of Embodiment 1; (ii) when inductor branch module C1 is present, the number of its internal inductor branches affects the output power of Embodiment 1; (iii) v AC1 and v ac1 The amplitude difference or level difference also affects the output power of Example 1.

[0058] Furthermore, the inductance value of the inductor in the inductor branch module also affects the output characteristics (including output power and output current ripple) of Example 1.

[0059] Based on the above characteristics, the output characteristic adjustment method of Embodiment 1 includes any combination of the following steps:

[0060] Step 1: Increase or decrease the number of inductor branch modules C1 (from 0 to 1);

[0061] Step 2: Increase or decrease the number of inductor branches in the inductor branch module (0 to 4);

[0062] Step 3: Change the inductance value (L) of the inductor in the inductor branch module. a1 or / and L b1 or / and L c1 or / and L d1 );

[0063] Step 4: Change the AC power supply connected to M1. AC1 amplitude or level value (V) AC1 );

[0064] Step 5: Change the AC power supply connected to S1. ac1 amplitude or level value (A*V) AC1 ).

[0065] Example 2

[0066] refer to Figure 2 A multi-AC source bridge rectifier circuit includes at least one main power module, at least one slave power module and at least one inductor branch module.

[0067] Among them, there is one main power module M1, one slave power module S1, and one inductor branch module C1.

[0068] The main power module M1 includes a transformer T. 2A Diode D 2A Diode D 2B Diode D 2C and diode D 2D and inductor L S2A Transformer T 2A The two ports of the primary winding are connected to the AC power supply V. AC1 Connected, its secondary winding has two ports, intermediate ports 1_A and 1_B; diode D 2A The anode is connected to the first intermediate port 1_A of M1, and its cathode is connected to the positive terminal V of the DC bus. o + Or connected to the first terminal of the load; diode D 2B The anode is connected to the second intermediate port 1_B of M1, and its cathode is connected to the positive terminal V of the DC bus. o + Or connected to the first terminal of the load; diode D 2C The cathode is connected to the first intermediate port 1_A of M1, and its anode is connected to the inductor L. S2A One end is connected; diode D 2D The cathode is connected to the second intermediate port 1_B of M1, and its anode is connected to the inductor L. S2A One end is connected; inductor L S2A The other end is connected to the negative terminal V of the DC bus. o - Or connect to the second end of the load.

[0069] The inductor branch module C1 includes two inductor branches. The first inductor branch is connected to inductor L. a2 Diode D a2 and diode D b2 Composition, inductor L a2 One end is connected to the first intermediate port 1_A of M1, and the inductor L a2 The other end is simultaneously connected to diode D a2 anode and diode D b2 The anode of diode D is connected. a2 The cathode is connected to the first intermediate port 1_a of S1, and diode D b2 The cathode is connected to the second intermediate port 1_b of S1; the second inductor branch is connected to inductor L. b2 Diode D c2 and diode D d2 Composition, inductor L b2 One end is connected to the second intermediate port 1_B of M1, and the inductor L b2 The other end is simultaneously connected to diode D c2 anode and diode D d2The anode of diode D is connected. c2 The cathode is connected to the first intermediate port 1_a of S1, and diode D d2 The cathode is connected to the second intermediate port 1_b of S1. The function of the diode in the inductor branch is to limit the direction of current and prevent circulating current. The number of inductor branches in C1 is variable, ranging from 0 to 2.

[0070] The rest of the structure in Example 2 is the same as in Example 1.

[0071] For ease of understanding, Figure 3 Only a portion of the entire multi-AC source bridge rectifier circuit is shown—the main power module M1, the slave power module S1, and the inductor branch module C1. Figure 3 Taking the displayed portion as an example, we will introduce the steady-state operation of the master / slave power module and the inductor branch module. When the master / slave power module operates independently, it is a typical full-bridge rectification process, so it will not be described in detail.

[0072] For simplicity, assume that the main power module M1 and the slave power module S1 use the same components, and the transformer T 2A The first port of the primary winding and the first port 1_A of the secondary winding are related by name. Transformer T 1a The first port of the primary winding and the first port 1_a of the secondary winding are related by name; the AC power supply v connected to M1 AC1 A three-level AC power supply (+V) AC1 , 0, -V AC1 AC power supply V connected to S1 ac1 (t)=v AC1 (t-t0), i.e., v AC1 and v ac1 The amplitude or level value, frequency, period, and pulse width are all the same, but the initial phase is different. This will be illustrated using t0 = T1 / 4 (T1 being the period) as an example. Figure 3 One operating cycle T1 of the circuit shown can be divided into 4 stages, and a typical operating condition is as follows:

[0073] (1) Stage 1: v AC1 =+V AC1 &v ac1 =0

[0074] At this time, T 1a The secondary side is equivalent to a short circuit;

[0075] In main power module M1: D 2A and D 2D Conduction, D 2B and D 2C As of now, (a)v AC1 via T 2A With D2A DC bus or load, L S2A D 2D This forms the first loop;

[0076] From power module S1: D 1c and D 1d Conductive, (b)D 1a Conduct until D 1c L s1a DC bus or load, D 1a The current in the second loop is zero; (c)D 1b Conduct until D 1d L s1a DC bus or load, D 1b The current in the third loop is zero.

[0077] In inductor branch module C1: D a2 D b2 D c2 and D d2 Conduction, (d)v AC1 via T 2A With L a2 D a2 D b2 D 1c D 1d L s1a DC bus or load, L S2A D 2D This forms the fourth loop, through which L flows. a2 The current is from D a2 and D b2 and D 1c and D 1d Share the burden; (e)L b2 D c2 D d2 D 1c D 1d L s1a DC bus or load, L S2A D 2D This forms the fifth loop, through which L flows. b2 The current is from D c2 and D d2 and D 1c and D 1d Share the burden.

[0078] (2) Stage 2: v AC1 =0&v ac1 =+V AC1

[0079] At this time, T 2AThe secondary side is equivalent to a short circuit;

[0080] In main power module M1: D 2C and D 2D Conductive, (a)D 2A Conduct until D 2A DC bus or load, L S2A D 2C The current in the first loop is zero; (b)D 2B Conduct until D 2B DC bus or load, L S2A D 2D The current in the second loop is zero.

[0081] From power module S1: D 1b and D 1c Conduction, D 1a and D 1d As of now, (c)v ac1 via T 1a With D 1c L s1a DC bus or load, D 1b This forms the third loop;

[0082] In inductor branch module C1: D b2 and D d2 Conduction, D a2 and D c2 As of now, (d)v ac1 via T 1a With L a2 D b2 D 1c L s1a DC bus or load, L S2A D 2C D 2D This forms the fourth loop; (e)v ac1 via T 1a With L b2 D d2 D 1c L s1a DC bus or load, L S2A D 2C D 2D This forms the fifth loop. The current flows through L. a2 and L b2 The current is all from D 2C and D 2D Share the burden.

[0083] (3) Stage 3: v AC1 =-V AC1 &v ac1 =0

[0084] At this time, T 1a The secondary side is equivalent to a short circuit;

[0085] In main power module M1: D 2B and D 2C Conduction, D 2A and D 2D As of now, (a)v AC1 via T 2A With D 2B DC bus or load, L S2A D 2C This forms the first loop;

[0086] From power module S1: D 1c and D 1d Conductive, (b)D 1a Conduct until D 1c L s1a DC bus or load, D 1a The current in the second loop is zero; (c)D 1b Conduct until D 1d L s1a DC bus or load, D 1b The current in the third loop is zero.

[0087] In inductor branch module C1: D a2 D b2 D c2 and D d2 Conduction, (d)L a2 D a2 D b2 D 1c D 1d L s1a DC bus or load, L S2A D 2C This forms the fourth loop, through which L flows. a2 The current is from D a2 and D b2 and D 1c and D 1d Share the burden; (e)v AC1 via T 2A With L b2 D c2 D d2 D 1c D 1d L s1a DC bus or load, L S2A D 2C This forms the fifth loop, through which L flows. b2 The current is from Dc2 and D d2 and D 1c and D 1d Share the burden.

[0088] (4) Stage 4: v AC1 =0&v ac1 =-V AC1

[0089] At this time, T 2A The secondary side is equivalent to a short circuit;

[0090] In main power module M1: D 2C and D 2D Conductive, (a)D 2A Conduct until D 2A DC bus or load, L S2A D 2C The current in the first loop is zero; (b)D 2B Conduct until D 2B DC bus or load, L S2A D 2D The current in the second loop is zero.

[0091] From power module S1: D 1a and D 1d Conduction, D 1b and D 1c As of now, (c)v ac1 via T 1a With D 1d L s1a DC bus or load, D 1a This forms the third loop;

[0092] In inductor branch module C1: D a2 and D c2 Conduction, D b2 and D d2 As of now, (d)v ac1 via T 1a With L a2 D a2 D 1d L s1a DC bus or load, L S2A D 2C D 2D This forms the fourth loop; (e)v ac1 via T 1a With L b2 D c2 D 1d L s1a DC bus or load, L S2A D2C D 2D This forms the fifth loop. The current flows through L. a2 and L b2 The current is all from D 2C and D 2D Share the burden.

[0093] As can be seen from the above working process, when the main power module M1, the slave power module S1 and the inductor branch module C1 work together, they alternately convert the electrical energy of the two AC power sources and supply it to the DC bus or load.

[0094] The operation of C1 with only one inductor branch is similar to that described above and will not be repeated. To facilitate understanding of the impact of inductor branch module C1 on the output characteristics of the entire multi-AC source bridge rectifier circuit, assume: V AC1 =15V, v AC1 The period T1 = 90 μs, v AC1 +V AC1 Pulse width is T1 / 4, v AC1 -V AC1 The pulse width is also T1 / 4, T 2A and T 1a The primary and secondary turns ratios are both 1:2, the coupling coefficient is 0.999, and the DC bus voltage V o =20V. Let's take three cases for further explanation: Case 1: t0 = 0; Case 2: t0 = T1 / 8; Case 3: t0 = T1 / 4.

[0095] Take L a2 =L b2 =L S2A =L s1a =100μH, Figure 4 The above three scenarios provide an example of the output power performance of Embodiment 2 of the present invention. Figure 5 The output current ripple performance of Embodiment 2 of the present invention is given under the above three conditions. Figure 4 and Figure 5 It can be seen that (i) the presence or absence of inductor branch module C1 ("absence" is equivalent to the case where the number of its internal inductor branches is 0) affects the output characteristics of Embodiment 2; (ii) when inductor branch module C1 is present, the number of its internal inductor branches affects the output characteristics of Embodiment 2; (iii) v AC1 and v ac1 The phase difference also affects the output characteristics of Example 2.

[0096] Furthermore, the inductance value of the inductor in the inductor branch module also affects the output characteristics (including output power and output current ripple) of Example 1.

[0097] Based on the above characteristics, the output characteristic adjustment method of Embodiment 2 includes any combination of the following steps:

[0098] Step 1: Increase or decrease the number of inductor branch modules C1 (from 0 to 1);

[0099] Step 2: Increase or decrease the number of inductor branches in the inductor branch module (0 to 2);

[0100] Step 3: Change the inductance value (L) of the inductor in the inductor branch module. a2 or / and L b2 );

[0101] Step 4: Change the AC power supply connected to the main power module M1. AC1 The phase;

[0102] Step 5: Change the AC power supply connected to the power module S1. ac1 The phase (t0).

[0103] Example 3

[0104] refer to Figure 6 A multi-AC source bridge rectifier circuit includes at least one main power module, at least one slave power module, and at least one inductor branch module. The main power module is M1, the slave power module is S1, and the inductor branch module is C1.

[0105] The power module S1 includes a transformer T 2a Diode D 2a Diode D 2b Diode D 2c Diode D 2d and inductor L s2a Transformer T 2a The two ports of the primary winding are connected to the AC power supply V. ac1 Connected, its secondary winding has two ports, intermediate ports 1_a and 1_b; diode D 2a The anode is connected to the first intermediate port 1_a of S1, and its cathode is connected to the positive terminal V of the DC bus. o + Or connected to the first terminal of the load; diode D 2b The anode is connected to the second intermediate port 1_b of S1, and its cathode is connected to the positive terminal V of the DC bus. o + Or connected to the first terminal of the load; diode D 2c The cathode is connected to the first intermediate port 1_a of S1, and its anode is connected to the inductor L. s2a One end is connected; diode D 2dThe cathode is connected to the second intermediate port 1_b of S1, and its anode is connected to the inductor L. s2a One end is connected; inductor L s2a The other end is connected to the negative terminal V of the DC bus. o - Or connect to the second end of the load.

[0106] The inductor branch module C1 includes two inductor branches. The first inductor branch is connected to inductor L. a3 Diode D a3 and diode D b3 Composition, inductor L a3 One end is connected to the first intermediate port 1_a of S1, and the inductor L a3 The other end is simultaneously connected to diode D a3 cathode and diode D b3 The cathodes are connected, and diode D a3 The anode of diode D is connected to the first intermediate port 1_A of M1. b3 The anode is connected to the second intermediate port 1_B of M1; the second inductor branch is connected to inductor L. b3 Diode D c3 and diode D d3 Composition, inductor L b3 One end is connected to the second intermediate port 1_b of S1, and the inductor L b3 The other end is simultaneously connected to diode D c3 cathode and diode D d3 The cathodes are connected, and diode D c3 The anode of diode D is connected to the first intermediate port 1_A of M1. d3 The anode of the diode is connected to the second intermediate port 1_B of M1. The function of the diode in the inductor branch is to limit the direction of current and prevent circulating current. The number of inductor branches in C1 is variable, ranging from 0 to 2.

[0107] The remaining structure of Example 3 is the same as that of Example 1.

[0108] Structurally, Embodiment 3 and Embodiment 2 are reciprocal. Except for the opposite direction of some currents, the working principle and effect of Embodiment 3 are similar to or equivalent to those of Embodiment 2, and the applicable output characteristic adjustment methods are also the same, which will not be repeated here.

[0109] Example 4

[0110] refer to Figure 7 A multi-AC source bridge rectifier circuit includes at least one main power module, at least one slave power module, and at least one inductor branch module. The main power module is M1, the slave power module is S1, and the inductor branch module is C1.

[0111] The main power module M1 is the same as in Embodiment 2; the slave power module S1 is the same as in Embodiment 3.

[0112] The inductor branch module C1 includes one inductor branch, which is an inductor L. a4 Diode D a4 Diode D b4 Diode D c4 and diode D d4 Composition, diode D a4 cathode and diode D b4 The cathodes are all connected to the inductor L a4 One end is connected to diode D c4 anode and diode D d4 The anodes of both are related to the inductor L a4 The other end is connected, diode D a4 The anode of diode D is connected to the first intermediate port 1_A of M1. b4 The anode of diode D is connected to the second intermediate port 1_B of M1. c4 The cathode is connected to the first intermediate port 1_a of S1, and diode D d4 The cathode is connected to the second intermediate port 1_b of S1. The function of the diode in the inductor branch is to limit the direction of current and prevent circulating current. The number of inductor branches in C1 is variable, ranging from 0 to 1.

[0113] For ease of understanding, Figure 7 Only a portion of the entire multi-AC source bridge rectifier circuit is shown—the main power module M1, the slave power module S1, and the inductor branch module C1. Figure 7 Taking the displayed portion as an example, we will introduce the steady-state operation of the master / slave power module and the inductor branch module. When the master / slave power module operates independently, it is a typical full-bridge rectification process, so it will not be described in detail.

[0114] For simplicity, assume that the main power module M1 and the slave power module S1 use the same components, and the transformer T 2A The first port of the primary winding and the first port 1_A of the secondary winding are related by name. Transformer T 2a The first port of the primary winding and the first port 1_a of the secondary winding are related by name; the AC power supply v connected to the main power module M1 AC1 A three-level AC power supply (+V) AC1 , 0, -V AC1 AC power supply V connected to power module S1 ac1 (t)=v AC1 (a·t), i.e., v AC1 and v ac1The amplitude or level value, initial phase, and pulse width ratio are the same, but the frequency and period are different. This will be illustrated using a=2 as an example. Figure 7 One operating cycle T1 of the circuit shown can be divided into 8 stages, and a typical operating condition is as follows:

[0115] (1) Stage 1: v AC1 =+V AC1 &v ac1 =+V AC1

[0116] In main power module M1: D 2D Conduction, D 2A D 2B D 2C Deadline;

[0117] From power module S1: D 2a D 2d Conduction, D 2b D 2c As of now, (a)v ac1 via T 2a With D 2a DC bus or load, L s2a D 2d This forms the first loop;

[0118] In inductor branch module C1: D a4 D d4 Conduction, D b4 D c4 As of now, (b)v AC1 via T 2A v ac1 via T 2a With D a4 L a4 D d4 D 2a DC bus or load, L S2A D 2D This forms the second loop.

[0119] (2) Stage 2: v AC1 =+V AC1 &v ac1 =0

[0120] At this time, T 2a The secondary side is equivalent to a short circuit;

[0121] In main power module M1: D 2A D 2D Conduction, D 2B D 2C As of now, (a)v AC1 via T 2AWith D 2A DC bus or load, L S2A D 2D This forms the first loop;

[0122] From power module S1: D 2a D 2b Conductive, (b)D 2c Conduct until D 2a DC bus or load, L s2a D 2c The current in the second loop is zero; (c)D 2d Conduct until D 2b DC bus or load, L s2a D 2d The current in the third loop is zero.

[0123] In inductor branch module C1: D a4 D c4 D d4 Conduction, D b4 As of now, (d)v AC1 via T 2A With D a4 L a4 D c4 D d4 D 2a D 2b DC bus or load, L S2A D 2D This forms the fourth loop, through which L flows. a4 The current is from D c4 and D d4 and D 2a and D 2b Share the burden.

[0124] (3) Stage 3: v AC1 =0&v ac1 =-V AC1

[0125] At this time, T 2A The secondary side is equivalent to a short circuit;

[0126] In main power module M1: D 2C D 2D Conductive, (a)D 2A Conduct until D 2A DC bus or load, L S2A D 2C The current in the first loop is zero; (b)D 2B Conduct until D 2B DC bus or load, LS2A D 2D The current in the second loop is zero.

[0127] From power module S1: D 2b D 2c Conduction, D 2a D 2d As of now, (c)v ac1 via T 2a With D 2b DC bus or load, L s2a D 2c This forms the third loop;

[0128] In inductor branch module C1: D a4 D b4 D c4 Conduction, D d4 As of now, (d)v ac1 via T 2a With D a4 D b4 L a4 D c4 D 2b DC bus or load, L S2A D 2C D 2D This forms the fourth loop, through which L flows. a4 The current is from D a4 and D b4 and D 2C and D 2D Share the burden.

[0129] (4) Stage 4: v AC1 =0&v ac1 =0

[0130] At this time, T 2A Secondary side and T 2a The secondary sides are all equivalent to short circuits;

[0131] In main power module M1: D 2C D 2D Conduction, D 2A D 2B Deadline;

[0132] From power module S1: D 2a D 2b Conductive, (a)D 2c Conduct until D 2a DC bus or load, L s2a D 2c The current in the first loop is zero; (b)D 2d Conduct until D2b DC bus or load, L s2a D 2d The current in the second loop is zero.

[0133] In inductor branch module C1: D a4 D b4 D c4 D d4 Conductive, (c)D a4 D b4 L a4 D c4 D d4 D 2a D 2b DC bus or load, L S2A D 2C D 2D This forms the third loop, through which L flows. a4 The current is from D a4 and D b4 D c4 and D d4 D 2a and D 2b and D 2C and D 2D Share the burden.

[0134] (5) Stage 5: v AC1 =-V AC1 &v ac1 =+V AC1

[0135] In main power module M1: D 2C Conduction, D 2A D 2B D 2D Deadline;

[0136] From power module S1: D 2a D 2d Conduction, D 2b D 2c As of now, (a)v ac1 via T 2a With D 2a DC bus or load, L s2a D 2d This forms the first loop;

[0137] In inductor branch module C1: D b4 D d4 Conduction, D a4 D c4 As of now, (b)v AC1 via T 2A vac1 via T 2a With D b4 L a4 D d4 D 2a DC bus or load, L S2A D 2C This forms the second loop.

[0138] (6) Stage 6: v AC1 =-V AC1 &v ac1 =0

[0139] At this time, T 2a The secondary side is equivalent to a short circuit;

[0140] In main power module M1: D 2B D 2C Conduction, D 2A D 2D As of now, (a)v AC1 via T 2A With D 2B DC bus or load, L S2A D 2C This forms the first loop;

[0141] From power module S1: D 2a D 2b Conductive, (b)D 2c Conduct until D 2a DC bus or load, L s2a D 2c The current in the second loop is zero; (c)D 2d Conduct until D 2b DC bus or load, L s2a D 2d The current in the third loop is zero.

[0142] In inductor branch module C1: D b4 D c4 D d4 Conduction, D a4 As of now, (d)v AC1 via T 2A With D b4 L a4 D c4 D d4 D 2a D 2b DC bus or load, L S2A D 2C This forms the fourth loop, through which L flows. a4 The current is from Dc4 and D d4 and D 2a and D 2b Share the burden.

[0143] (7) Stage 7: v AC1 =0&v ac1 =-V AC1

[0144] At this time, T 2A The secondary side is equivalent to a short circuit;

[0145] In main power module M1: D 2C D 2D Conductive, (a)D 2A Conduct until D 2A DC bus or load, L S2A D 2C The current in the first loop is zero; (b)D 2B Conduct until D 2B DC bus or load, L S2A D 2D The current in the second loop is zero.

[0146] From power module S1: D 2b D 2c Conduction, D 2a D 2d As of now, (c)v ac1 via T 2a With D 2b DC bus or load, L s2a D 2c This forms the third loop;

[0147] In inductor branch module C1: D a4 D b4 D c4 Conduction, D d4 As of now, (d)v ac1 via T 2a With D a4 D b4 L a4 D c4 D 2b DC bus or load, L S2A D 2C D 2D The fourth circuit is formed, in which L flows through a4 The current is from D a4 and D b4 and D 2C and D 2D Share the burden.

[0148] (8) Stage 8: v AC1 =0&v ac1 =0

[0149] At this time, T 2A Secondary side and T 2a The secondary sides are all equivalent to short circuits;

[0150] In main power module M1: D 2C D 2D Conduction, D 2A D 2B Deadline;

[0151] From power module S1: D 2a D 2b Conductive, (a)D 2c Conduct until D 2a DC bus or load, L s2a D 2c The current in the first loop is zero; (b)D 2d Conduct until D 2b DC bus or load, L s2a D 2d The current in the second loop is zero.

[0152] In inductor branch module C1: D a4 D b4 D c4 D d4 Conductive, (c)D a4 D b4 L a4 D c4 D d4 D 2a D 2b DC bus or load, L S2A D 2C D 2D This forms the third loop, through which L flows. a4 The current is from D a4 and D b4 D c4 and D d4 D 2a and D 2b and D 2C and D 2D Share the burden.

[0153] As can be seen from the above working process, when the main power module M1, the slave power module S1 and the inductor branch module C1 work together, they can either independently or jointly convert the electrical energy of the two AC power sources and supply it to the DC bus or the load.

[0154] To better understand the impact of the inductor branch module C1 on the output characteristics of the entire multi-AC source bridge rectifier circuit, assume: V AC1 =12V, v AC1 The period T1 = 90 μs, v AC1 +V AC1 Pulse width is T1 / 4, v AC1 -V AC1 The pulse width is T1 / 4, T 2A and T 1a The primary and secondary turns ratios are both 1:2, and the DC bus voltage V o =18V. Two cases will be considered for further explanation: Case 1: a = 2; Case 2: a = 1.

[0155] Take L a4 =100μH,L S2A =L s2a =300μH, Figure 8 The above two scenarios provide an output power performance of Embodiment 4 of the present invention. Figure 9 The output current ripple performance of Embodiment 4 of the present invention is given under the above two conditions. Figure 8 and Figure 9 It can be seen that (i) the presence or absence of inductor branch module C1 ("absence" is equivalent to the case where the number of its internal inductor branches is 0) affects the output characteristics of Example 4; (ii) the number of internal inductor branches of inductor branch module C1 affects the output characteristics of Example 4; (iii) v AC1 and v ac1 The frequency difference or period difference also affects the output characteristics of Example 4.

[0156] Furthermore, the inductance value of the inductor in the inductor branch module also affects the output characteristics (including output power and output current ripple) of Example 4.

[0157] Based on the above characteristics, the output characteristic adjustment method of Embodiment 4 includes any combination of the following steps:

[0158] Step 1: Increase or decrease the number of inductor branch modules C1 (from 0 to 1);

[0159] Step 2: Increase or decrease the number of inductor branches in the inductor branch module (0 to 1);

[0160] Step 3: Change the inductance value (L) of the inductor in the inductor branch module. a4 );

[0161] Step 4: Change the AC power supply connected to the main power module M1. AC1 The frequency or period (T1);

[0162] Step 5: Change the AC power supply connected to the power module S1. ac1 The frequency or period (T1 / a).

[0163] As described in the invention, both the main power module and the slave power module have two preferred structures, and the inductor branch module has four preferred structures. These can be combined to form at least 16 embodiments. Only typical embodiments 1 to 4 are selected for illustration and explanation; the remaining embodiments are not described in detail because their working principles are largely similar.

[0164] Although diodes are used for freewheeling and energy transfer on the secondary side of each transformer in the foregoing embodiments, those skilled in the art will understand that the diodes can also be replaced by controllable switching devices (e.g., synchronous rectifier MOSFETs). Furthermore, the AC power supply in the foregoing embodiments can be an AC-AC, DC-AC, or other AC-output power (electronic) device; the transformer parameters (e.g., number of turns on the primary and secondary sides, magnetizing inductance, and the relationship between the same and different terminals) in the main power module and the slave power module can be the same or different. The number of inductor branches, component composition, and component connection method in the inductor branch module can be selected and adjusted according to the specific application. Besides inductors and diodes, the foregoing inductor branches can also include other types of components or combinations of components; these modifications do not exceed the scope of protection of this invention. The embodiments described in this specification are merely examples of implementations of the inventive concept; the scope of protection of this invention should not be considered limited to the specific forms stated in the embodiments, and the scope of protection of this invention also extends to equivalent technical means that those skilled in the art can conceive of based on the inventive concept.

Claims

1. A multi-AC source bridge rectifier circuit, comprising a main power module, a slave power module, and an inductor branch module, wherein: The main power module includes: The first transformer has two ports of its primary winding for connection to the first AC power source, and two ports of its secondary winding for the first intermediate port and the second intermediate port of the main power module, respectively. The first diode has its cathode connected to the first intermediate port of the main power module, and its anode is used to connect to the negative terminal of the DC bus or the second terminal of the load. The second diode has its cathode connected to the second intermediate port of the main power module and its anode connected to the negative terminal of the DC bus or the second terminal of the load. The anode of the third diode is connected to the first intermediate port of the main power module; The fourth diode, whose anode is connected to the second intermediate port of the main power module; and The first inductor has one end connected to the cathodes of the third and fourth diodes, and the other end is used to connect to the positive terminal of the DC bus or the first terminal of the load. The power module includes: The second transformer has two ports of its primary winding for connection to the second AC power supply, and two ports of its secondary winding from the first intermediate port and the second intermediate port of the power module, respectively. The fifth diode has its cathode connected to the first intermediate port of the power module and its anode connected to the negative terminal of the DC bus or the second terminal of the load. The sixth diode has its cathode connected to the second intermediate port of the power module and its anode connected to the negative terminal of the DC bus or the second terminal of the load. The seventh diode has its anode connected to the first intermediate port of the power module; The eighth diode, whose anode is connected to the second intermediate port of the power module; and The second inductor has one end connected to the cathodes of the seventh and eighth diodes, and the other end is used to connect to the positive terminal of the DC bus or the first terminal of the load. The inductor branch module includes at least one inductor branch, wherein: The inductor branch includes an inductor and a diode, and has a current input terminal and a current output terminal. Its current input terminal is connected to the first intermediate port or the second intermediate port of the main power module, and its current output terminal is connected to the first intermediate port or the second intermediate port of the slave power module.

2. A multi-AC source bridge rectifier circuit, comprising a main power module, a slave power module, and an inductor branch module, wherein: The main power module includes: The first transformer has two ports of its primary winding for connection to the first AC power source, and two ports of its secondary winding for the first intermediate port and the second intermediate port of the main power module, respectively. The first diode has its anode connected to the first intermediate port of the main power module, and its cathode is used to connect to the positive terminal of the DC bus or the first terminal of the load. The second diode has its anode connected to the second intermediate port of the main power module, and its cathode is used to connect to the positive terminal of the DC bus or the first terminal of the load. The cathode of the third diode is connected to the first intermediate port of the main power module. The fourth diode, whose cathode is connected to the second intermediate port of the main power module; and The first inductor has one end connected to the anode of the third and fourth diodes, and the other end is used to connect to the negative terminal of the DC bus or the second terminal of the load. The power module includes: The second transformer has two ports of its primary winding for connection to the second AC power supply, and two ports of its secondary winding from the first intermediate port and the second intermediate port of the power module, respectively. The fifth diode has its cathode connected to the first intermediate port of the power module and its anode connected to the negative terminal of the DC bus or the second terminal of the load. The sixth diode has its cathode connected to the second intermediate port of the power module and its anode connected to the negative terminal of the DC bus or the second terminal of the load. The seventh diode has its anode connected to the first intermediate port of the power module; The eighth diode, whose anode is connected to the second intermediate port of the power module; and The second inductor has one end connected to the cathodes of the seventh and eighth diodes, and the other end is used to connect to the positive terminal of the DC bus or the first terminal of the load. The inductor branch module includes at least one inductor branch, wherein: The inductor branch includes an inductor and a diode, and has a current input terminal and a current output terminal. Its current input terminal is connected to the first intermediate port or the second intermediate port of the main power module, and its current output terminal is connected to the first intermediate port or the second intermediate port of the slave power module.

3. A multi-AC source bridge rectifier circuit, comprising a main power module, a slave power module, and an inductor branch module, wherein: The main power module includes: The first transformer has two ports of its primary winding for connection to the first AC power source, and two ports of its secondary winding for the first intermediate port and the second intermediate port of the main power module, respectively. The first diode has its cathode connected to the first intermediate port of the main power module, and its anode is used to connect to the negative terminal of the DC bus or the second terminal of the load. The second diode has its cathode connected to the second intermediate port of the main power module and its anode connected to the negative terminal of the DC bus or the second terminal of the load. The anode of the third diode is connected to the first intermediate port of the main power module; The fourth diode, whose anode is connected to the second intermediate port of the main power module; and A first inductor, one end of which is connected to the cathodes of the third and fourth diodes, and the other end of which is used to connect to the positive terminal of the DC bus or the first terminal of the load; the power module includes: The second transformer has two ports of its primary winding for connection to the second AC power supply, and two ports of its secondary winding from the first intermediate port and the second intermediate port of the power module, respectively. The fifth diode has its anode connected to the first intermediate port of the power module and its cathode connected to the positive terminal of the DC bus or the first terminal of the load. The sixth diode has its anode connected to the second intermediate port of the power module and its cathode connected to the positive terminal of the DC bus or the first terminal of the load. The seventh diode has its cathode connected to the first intermediate port of the power module; The eighth diode, whose cathode is connected to the second intermediate port of the power module; and The second inductor has one end connected to the anode of the seventh and eighth diodes, and the other end is used to connect to the negative terminal of the DC bus or the second terminal of the load. The inductor branch module includes at least one inductor branch, wherein: The inductor branch includes an inductor and a diode, and has a current input terminal and a current output terminal. Its current input terminal is connected to the first intermediate port or the second intermediate port of the main power module, and its current output terminal is connected to the first intermediate port or the second intermediate port of the slave power module.

4. A multi-AC source bridge rectifier circuit, comprising a main power module, a slave power module, and an inductor branch module, wherein: The main power module includes: The first transformer has two ports of its primary winding for connection to the first AC power source, and two ports of its secondary winding for the first intermediate port and the second intermediate port of the main power module, respectively. The first diode has its anode connected to the first intermediate port of the main power module, and its cathode is used to connect to the positive terminal of the DC bus or the first terminal of the load. The second diode has its anode connected to the second intermediate port of the main power module, and its cathode is used to connect to the positive terminal of the DC bus or the first terminal of the load. The cathode of the third diode is connected to the first intermediate port of the main power module. The fourth diode, whose cathode is connected to the second intermediate port of the main power module; and The first inductor has one end connected to the anode of the third and fourth diodes, and the other end is used to connect to the negative terminal of the DC bus or the second terminal of the load. The power module includes: The second transformer has two ports of its primary winding for connection to the second AC power supply, and two ports of its secondary winding from the first intermediate port and the second intermediate port of the power module, respectively. The fifth diode has its anode connected to the first intermediate port of the power module and its cathode connected to the positive terminal of the DC bus or the first terminal of the load. The sixth diode has its anode connected to the second intermediate port of the power module and its cathode connected to the positive terminal of the DC bus or the first terminal of the load. The seventh diode has its cathode connected to the first intermediate port of the power module; The eighth diode, whose cathode is connected to the second intermediate port of the power module; and The second inductor has one end connected to the anode of the seventh and eighth diodes, and the other end is used to connect to the negative terminal of the DC bus or the second terminal of the load. The inductor branch module includes at least one inductor branch, wherein: The inductor branch includes an inductor and a diode, and has a current input terminal and a current output terminal. Its current input terminal is connected to the first intermediate port or the second intermediate port of the main power module, and its current output terminal is connected to the first intermediate port or the second intermediate port of the slave power module.

5. The multi-AC source bridge rectifier circuit according to any one of claims 1 to 4, wherein the inductor branch includes a ninth diode and a third inductor connected in series.

6. The multi-AC source bridge rectifier circuit according to any one of claims 1 to 4, wherein the inductor branch comprises: The ninth diode has its cathode as the first current output terminal of the inductor branch and is connected to the first intermediate port of the power module. The tenth diode has its cathode as the second current output terminal of the inductor branch and is connected to the second intermediate port of the power module. as well as The third inductor has one end connected to the anode of the ninth and tenth diodes, and the other end is the current input terminal of the inductor branch.

7. The multi-AC source bridge rectifier circuit as described in any one of claims 1 to 4, wherein the inductor branch comprises: The ninth diode has its anode at the first current input terminal of the inductor branch and is connected to the first intermediate port of the main power module. The tenth diode has its anode at the second current input terminal of the inductor branch and is connected to the second intermediate port of the main power module. as well as The third inductor has one end connected to the cathodes of the ninth and tenth diodes, and the other end is the current output terminal of the inductor branch.

8. The multi-AC source bridge rectifier circuit as described in any one of claims 1 to 4, wherein the inductor branch comprises: The ninth diode has its anode at the first current input terminal of the inductor branch and is connected to the first intermediate port of the main power module. The tenth diode has its anode at the second current input terminal of the inductor branch and is connected to the second intermediate port of the main power module. The eleventh diode has its cathode as the first current output terminal of the inductor branch and is connected to the first intermediate port of the power module. The twelfth diode has its cathode as the second current output terminal of the inductor branch and is connected to the second intermediate port of the power module. as well as The third inductor has one end connected to the cathodes of the ninth and tenth diodes, and the other end connected to the anodes of the eleventh and twelfth diodes.

9. The multi-AC source bridge rectifier circuit according to any one of claims 1 to 4, wherein some or all of the diodes are replaced by controllable switching devices.

10. A method for adjusting the output characteristics of a multi-AC source bridge rectifier circuit as described in any one of claims 1 to 4, comprising any combination of the following steps: Step 1: Increase or decrease the number of inductor branch modules; Step 2: Increase or decrease the number of inductor branches in the inductor branch module; Step 3: Change the inductance value of the inductor in the inductor branch module; Step 4: Change the operating parameters of the first AC power supply connected to the main power module; Step 5: Change the operating parameters of the second AC power supply connected to the power module.

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