Rectifier circuit comprising a bridge rectifier power module and method for regulating the output characteristics thereof

Abstract

The application relates to a rectifier circuit comprising bridge rectifier power modules and an output characteristic adjusting method thereof, wherein the rectifier circuit comprises at least one complete power module, at least one simplified power module and at least one inductance branch module. The complete power module, the simplified power module and the inductance branch module have multiple forms. The complete power module can independently complete electric energy conversion, and the simplified power module cooperates with the complete power module through the inductance branch module, which makes the output characteristic of the whole circuit more adjustable, and the applicable output characteristic adjusting method is more diversified.

Description

TECHNICAL FIELD

[0001] The present application relates to a rectifier circuit, in particular to a bridge rectifier circuit with multiple input sources. BACKGROUND

[0002] A rectifier circuit is a circuit that can convert alternating current (AC) into direct current (DC), and is widely used in power, transportation, metallurgy, petroleum, chemical industry and other industries. Among them, the bridge rectifier circuit is a common rectifier circuit, and its main features are: high utilization rate of transformer, and more rectifier devices required.

[0003] With the development of new energy power generation technology, AC power sources are diverse, including traditional thermal, hydro, nuclear power generating units, as well as wind, solar, tidal, hydrogen power generating units, etc. The rectifier circuit with multiple input sources has the ability to comprehensively utilize multiple AC power sources. At present, the common rectifier circuit with multiple input sources mostly adopts the form of "single-phase multiple". That is, the rectifier circuit with multiple input sources is composed of multiple identical and independent single-input source sub-rectifier circuits, and the input ends of each sub-rectifier circuit remain independent but the output ends are connected in parallel. SUMMARY

[0004] The "single-phase multiple" rectifier circuit has a simple structure, and each sub-rectifier circuit works independently, only showing a simple decoupling working relationship with each other. However, this feature of "identical structure and independent work of each sub-rectifier circuit" will sacrifice the possibility of collaborative work of each sub-rectifier circuit and further simplification of the entire circuit.

[0005] In order to overcome the shortcomings of the lack of collaborative work of each sub-rectifier circuit and the insufficient simplification of the circuit in the existing "single-phase multiple" rectifier circuit, based on the bridge rectifier circuit, the present application proposes a rectifier circuit containing a bridge rectifier power module, and also includes an applicable output characteristic adjustment method, so that its performance is further improved.

[0006] The rectifier circuit with bridge rectifier power module according to the embodiment of the present application comprises a complete power module, a simplified power module and an inductor branch module. The complete power module comprises: a first transformer, two ports of a primary winding of which are used for connecting with a first AC power source, two ports of a secondary winding of which are a first intermediate port and a second intermediate port of the complete power module respectively; a first diode, a cathode of which is connected with the first intermediate port of the complete power module, and an anode of which is used for connecting with a negative terminal of a DC bus or a second terminal of a load; a second diode, a cathode of which is connected with the second intermediate port of the complete power module, and an anode of which is used for connecting with the negative terminal of the DC bus or the second terminal of the load; a third diode, an anode of which is connected with the first intermediate port of the complete power module; a fourth diode, an anode of which is connected with the second intermediate port of the complete power module; and a first inductor, one end of which is connected with cathodes of the third diode and the fourth diode, and the other end of which is used for connecting with a positive terminal of the DC bus or a first terminal of the load. The simplified power module comprises: a second transformer, two ports of a primary winding of which are used for connecting with a second AC power source, two ports of a secondary winding of which are a first intermediate port and a second intermediate port of the simplified power module respectively; a fifth diode, a cathode of which is connected with the first intermediate port of the simplified power module, and an anode of which is used for connecting with the negative terminal of the DC bus or the second terminal of the load; and a sixth diode, a cathode of which is connected with the second intermediate port of the simplified power module, and an anode of which is used for connecting with the negative terminal of the DC bus or the second terminal of the load. The inductor branch module comprises at least one inductor branch, wherein: the inductor branch comprises an inductor and a diode, and has a current input end and a current output end, the current input end of the inductor branch is connected with the first or second intermediate port of the simplified power module, and the current output end of the inductor branch is connected with the first or second intermediate port of the complete power module.

[0007] The embodiment of the present application also provides a rectifier circuit comprising a bridge rectifier power module, a simplified power module and an inductor branch module. The bridge rectifier power module comprises: a first transformer, two ports of a primary winding of which are connected to a first AC power source, two ports of a secondary winding of which are respectively a first intermediate port and a second intermediate port of the bridge rectifier power module; a first diode, a cathode of which is connected to the first intermediate port of the bridge rectifier power module, and an anode of which is connected to a negative terminal of a DC bus or a second terminal of a load; a second diode, a cathode of which is connected to the second intermediate port of the bridge rectifier power module, and an anode of which is connected to the negative terminal of the DC bus or the second terminal of the load; a third diode, an anode of which is connected to the first intermediate port of the bridge rectifier power module; a fourth diode, an anode of which is connected to the second intermediate port of the bridge rectifier power module; and a first inductor, one end of which is connected to cathodes of the third diode and the fourth diode, and the other end of which is connected to a positive terminal of the DC bus or a first terminal of the load. The simplified power module comprises: a second transformer, two ports of a primary winding of which are connected to a second AC power source, two ports of a secondary winding of which are respectively a first intermediate port and a second intermediate port of the simplified power module; a fifth diode, an anode of which is connected to the first intermediate port of the simplified power module, and a cathode of which is connected to the positive terminal of the DC bus or the first terminal of the load; and a sixth diode, an anode of which is connected to the second intermediate port of the simplified power module, and a cathode of which is connected to the positive terminal of the DC bus or the first terminal of the load. The inductor branch module comprises at least one inductor branch, wherein: the inductor branch comprises an inductor and a diode, and has a current input end and a current output end, the current input end of the inductor branch is connected to the first or second intermediate port of the bridge rectifier power module, and the current output end of the inductor branch is connected to the first or second intermediate port of the simplified power module.

[0008] The embodiment of the present application further provides a rectifier circuit comprising a bridge rectifier power module, a simplified power module and an inductor branch module. The bridge rectifier power module comprises: a first transformer, two ports of a primary winding of which are connected to a first AC power source, two ports of a secondary winding of which are a first intermediate port and a second intermediate port of the bridge rectifier power module; a first diode, an anode of which is connected to the first intermediate port of the bridge rectifier power module, and a cathode of which is connected to a positive terminal of a DC bus or a first terminal of a load; a second diode, an anode of which is connected to the second intermediate port of the bridge rectifier power module, and a cathode of which is connected to the positive terminal of the DC bus or the first terminal of the load; a third diode, a cathode of which is connected to the first intermediate port of the bridge rectifier power module; a fourth diode, a cathode of which is connected to the second intermediate port of the bridge rectifier power module; and a first inductor, one end of which is connected to anodes of the third diode and the fourth diode, and the other end of which is connected to a negative terminal of the DC bus or a second terminal of the load. The simplified power module comprises: a second transformer, two ports of a primary winding of which are connected to a second AC power source, two ports of a secondary winding of which are a first intermediate port and a second intermediate port of the simplified power module; a fifth diode, a cathode of which is connected to the first intermediate port of the simplified power module, and an anode of which is connected to the negative terminal of the DC bus or the second terminal of the load; and a sixth diode, a cathode of which is connected to the second intermediate port of the simplified power module, and an anode of which is connected to the negative terminal of the DC bus or the second terminal of the load. The inductor branch module comprises at least one inductor branch, wherein: the inductor branch comprises an inductor and a diode, and has a current input end and a current output end, the current input end of the inductor branch is connected to the first or second intermediate port of the simplified power module, and the current output end of the inductor branch is connected to the first or second intermediate port of the bridge rectifier power module.

[0009] Embodiments of the present invention further provide a rectifier circuit containing a bridge rectifier power module, comprising a complete power module, a simplified power module, and an inductor branch module. The complete 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 complete power module; a first diode, whose anode is connected to the first intermediate port of the complete power module, and whose cathode is connected to the positive terminal of a DC bus or the first terminal of a load; a second diode, whose anode is connected to the second intermediate port of the complete power module, and whose cathode is connected to the positive terminal of a DC bus or the first terminal of a load; a third diode, whose cathode is connected to the first intermediate port of the complete power module; a fourth diode, whose cathode is connected to the second intermediate port of the complete 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 a DC bus or the second terminal of a load. The simplified 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 simplified power module; a fifth diode, whose anode is connected to the first intermediate port of the simplified power module, and whose cathode is connected to the positive terminal of the DC bus or the first terminal of the load; and a sixth diode, whose anode is connected to the second intermediate port of the simplified power module, and whose cathode 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 of the inductor branch is connected to the first or second intermediate port of the complete power module, and the current output terminal of the inductor branch is connected to the first or second intermediate port of the simplified power module.

[0010] In some embodiments, the aforementioned inductor branch includes a seventh diode and a second inductor connected in series.

[0011] In some embodiments, the aforementioned inductor branch includes: a seventh diode, the anode of which is the first current input terminal of the inductor branch; an eighth diode, the anode of which is the second current input terminal of the inductor branch; 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 the current output terminal of the inductor branch.

[0012] In some embodiments, the aforementioned inductor branch includes: a seventh diode, the cathode of which is the first current output terminal of the inductor branch; an eighth diode, the cathode of which is the second current output terminal of the inductor branch; 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 the current input terminal of the inductor branch.

[0013] In some embodiments, the aforementioned inductor branch comprises: a seventh diode, whose anode is the first current input terminal of the inductor branch; an eighth diode, whose anode is the second current input terminal of the inductor branch; a ninth diode, whose cathode is the first current output terminal of the inductor branch; a twelfth diode, whose cathode is the second current output terminal of the inductor branch; 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 anodes of the ninth and twelfth diodes.

[0014] Based on the above structure, there are at least 16 combinations of the most basic unit of the rectifier circuit of the bridge-type rectifying power module, i.e. "one complete power module + one simplified power module + one inductor branch module". On the basis of the most basic unit, the composite structure of "multiple complete power modules + multiple simplified power modules + multiple inductor branch modules" can be further implemented, including one complete power module connected to multiple inductor branch modules, one simplified power module connected to multiple inductor branch modules, and a combination of different most basic units.

[0015] In some embodiments, the aforementioned part or all of the diodes can be replaced by controllable switching devices (such as synchronous rectification MOSFETs). The AC power source can be a multi-level AC power source of three levels or more, including a sinusoidal AC power source. The AC power sources can be the same or different.

[0016] The embodiments of the present application also provide an output characteristic adjustment method suitable for the aforementioned rectifier circuit, which comprises any combination of the following steps:

[0017] Step 1: increasing or decreasing the number of inductor branch modules;

[0018] Step 2: increasing or decreasing the number of inductor branches in the inductor branch module;

[0019] Step 3: changing the inductance of the inductor in the inductor branch module;

[0020] Step 4: changing the working parameters of the first AC power source connected to the complete power module, such as amplitude, frequency, period, phase, level value, pulse width, etc.

[0021] Step 5: changing the working parameters of the second AC power source connected to the simplified power module, such as amplitude, frequency, period, phase, level value, pulse width, etc.

[0022] The beneficial effects of the present application mainly include: compared with the prior "single-phase multiple" bridge rectifier circuit, the rectifier circuit including the bridge rectifier power module according to the embodiment of the present application includes a complete power module, a simplified power module and an inductor branch module, wherein the complete power module can independently complete power conversion, and the simplified power module cooperates with the complete power module through the inductor branch module. The output power regulation means is more diversified, that is, changing the number of inductor branch modules, changing the number of inductor branch modules inside the inductor branch modules, and changing the working parameters of the alternating current power supply can all adjust the output value of the rectifier circuit, and the adjustability of the output characteristics of the rectifier circuit is improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is the circuit diagram of the embodiment 1 of the present application.

[0024] Figure 2 is the output power characteristic diagram of the embodiment 1 of the present application.

[0025] Figure 3 is the circuit diagram of the embodiment 2 of the present application.

[0026] Figure 4 is the output power characteristic diagram of the embodiment 2 of the present application.

[0027] Figure 5 is the output current ripple characteristic diagram of the embodiment 2 of the present application.

[0028] Figure 6 is the circuit diagram of the embodiment 3 of the present application.

[0029] Figure 7 is the circuit diagram of the embodiment 4 of the present application.

[0030] Figure 8 is the output power characteristic diagram of the embodiment 4 of the present application.

[0031] Figure 9 is the output current ripple characteristic diagram of the embodiment 4 of the present application. DETAILED DESCRIPTION

[0032] The present application will be further described below with reference to the drawings. It should be noted that the embodiments described herein are only for illustration and do not limit the present application. In the following description, a large number of specific details are set forth in order to facilitate a thorough understanding of the present application. However, those skilled in the art can understand that these specific details are not essential to the implementation of the present application. In addition, in some embodiments, in order to avoid obscuring the present application, well-known circuits, materials or methods are not specifically described.

[0033] 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.

[0034] Example 1

[0035] refer to Figure 1 A rectifier circuit with a bridge rectifier power module includes at least one complete power module, at least one simplified power module, and at least one inductor branch module. In some embodiments, the rectifier circuit includes multiple complete power modules, multiple simplified power modules, and multiple inductor branch modules, which may have the same structure or different structures.

[0036] Among them, one complete power module is M1, one simplified power module is S1, and one inductor branch module is C1.

[0037] The complete power module M1 includes a transformer T. 1A diode D 1A D 1B D 1C D 1D and inductor L S1A Transformer T 1A 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 1A The cathode is connected to the first intermediate port 1_A, 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 The cathode is connected to the second intermediate port 1_B, 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 The anode is connected to the first intermediate port 1_A, and its cathode is connected to the inductor L. S1A One end is connected; diode D1D The anode is connected to the second intermediate port 1_B, 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.

[0038] The simplified power module S1 includes a transformer T. 1a Diode D 1a and diode D 1b Transformer T 1a 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 1a The cathode is connected to the first intermediate port 1_a, 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 The cathode is connected to the second intermediate port 1_b, and its anode is connected to the negative terminal V of the DC bus. o - Or connect to the second end of the load.

[0039] The inductor branch module C1 includes four inductor branches. The first inductor branch is an inductor L. a1 and diode D a1 The two inductor branches are connected in series. The current input terminal of the first inductor branch is connected to the first intermediate port 1_a of S1, and the current output terminal of the first inductor branch is connected to the first intermediate port 1_A of M1. The second inductor branch is connected to inductor L. b1 and diode D b1 The two inductor branches are connected in series. The current input terminal of the second inductor branch is connected to the second intermediate port 1_b of S1, and the current output terminal of the second inductor branch is connected to the first intermediate port 1_A of M1. The third inductor branch is connected to inductor L. c1 and diode D c1 The three inductor branches are connected in series. The current input terminal of the third inductor branch is connected to the first intermediate port 1_a of S1, and the current output terminal of the third inductor branch is connected to the second intermediate port 1_B of M1. The fourth inductor branch is connected to inductor L. d1 and diode D d1 The circuit is connected in series. The current input terminal of the fourth inductor branch is connected to the second intermediate port 1_b of S1, and the current output terminal of the fourth inductor branch is connected to the second intermediate port 1_B of M1. The diodes in the inductor branches are used to limit the current direction and prevent circulating current. The number of inductor branches in C1 is variable, ranging from 0 to 4.

[0040] For ease of understanding, Figure 1Only a portion of the rectifier circuit of the entire bridge-type rectifier power module is shown—the complete power module M1, the simplified power module S1, and the inductor branch module C1. Figure 1 Taking the displayed portion as an example, this section introduces the steady-state operation of the complete / simplified power module and inductor branch module. When the complete power module operates independently, it follows a typical bridge rectification process, which will not be elaborated further.

[0041] For simplicity, it is assumed that the complete power module M1 and the simplified 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 its secondary winding are related as identical terminals; the AC power supply v connected to the simplified power module S1 ac1 A three-level AC power supply (+V) ac1 , 0, -V ac1 AC power supply V connected to the complete power module M1 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:

[0042] (1) Stage 1: v ac1 =+V ac1

[0043] In the complete 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;

[0044] In simplified power module S1: D 1b Conduction, D 1a Deadline;

[0045] In inductor branch module C1: D c1 Conduction, D a1 and D d1 As of now, (b)vAC1 T 1A , v ac1 T 1a and D 1C , L S1A , DC bus or load, D 1b , D c1 , L c1 constitute the 2nd loop; (c) D b1 conducts until the current i b1 , D 1C , L S1A , DC bus or load, D 1b , D b1 in the 3rd loop constituted by L b1 is zero.

[0046] (2) Stage 2: v ac1 = 0

[0047] In the complete power module M1: D 1A , D 1B , D 1C and D 1D conduct, (a) L S1A , DC bus or load, D 1A , D 1C constitute the 1st loop; (b) L S1A , DC bus or load, D 1B , D 1D constitute the 2nd loop;

[0048] In the simplified power module S1: D 1a and D 1b conduct;

[0049] In the inductance branch module C1: D c1 conducts, D a1 , D b1 and D d1 are off; at this time, T 1A secondary and T 1a secondary both equivalent to short circuit, the current i c1 flows through the third inductance branch is shared by L S1A by D 1C and D 1D and D 1a and D 1b .

[0050] (3) Stage 3: v ac1 = -V ac1

[0051] In the complete power module M1: D 1A and D 1D conduct, D1B and D 1C off, (a) v AC1 through T 1A and D 1D , L S1A , DC bus or load, D 1A constitutes the first loop;

[0052] in the simplified power module S1 : D 1a on, D 1b off;

[0053] in the inductive branch module C1 : D b1 on, D a1 and D d1 off, (b) v AC1 through T 1A , v ac1 through T 1a and D b1 , L b1 , D 1D , L S1A , DC bus and load, D 1a constitutes the second loop; (c) D c1 is on until the current i c1 , D 1D , L S1A , DC bus or load, D 1a , D c1 in the third loop constituted by L c1 is zero.

[0054] (4) Phase 4: v ac1 = 0

[0055] in the complete power module M1 : D 1A , D 1B , D 1C and D 1D are on, (a) L S1A , DC bus or load, D 1A , D 1C constitutes the first loop; (b) L S1A , DC bus or load, D 1B , D 1D constitutes the second loop;

[0056] in the simplified power module S1 : D 1a and D 1b are on;

[0057] in the inductive branch module C1 : D b1 is on, D a1 , D c1 and D d1Cut-off; at this time, T 1A Secondary side and T 1a The secondary side is equivalent to a short circuit, and the current i b1 Through L S1A By D 1C And D 1D And D 1a And D 1b Share.

[0058] From the above working process, it can be seen that the complete power module M1, the simplified power module S1 and the inductor branch module C1 work together to convert the power of the two AC power supplies and supply it to the DC bus or the load independently or jointly.

[0059] In order to facilitate understanding of the influence of the inductor branch module C1 on the output characteristics (mainly the output power) of the rectifier circuit of the entire bridge rectifier power module, it is assumed that V ac1 = 15V, the period T1 of v ac1 = 90us, the +V ac1 pulse width of v ac1 = T1 / 4, the -V ac1 pulse width of v ac1 = T1 / 4, T 1A and T 1a The primary and secondary winding ratio is 1:2, the coupling coefficient is 0.999, and the DC bus voltage V o = 18V. Take three cases for further illustration, case 1: A = 1.33; case 2: A = 1; case 3: A = 0.67.

[0060] Take L a1 = L b1 = L c1 = L d1 = 100uH, L S1A = 300uH, Figure 2 The output power performance of the embodiment 1 of the present application under the above three conditions is given. From Figure 2 It can be seen that (i) the presence and absence of the inductor branch module C1 (the absence is equivalent to the number of internal inductor branches being 0) has an effect on the output power of the embodiment 1; (ii) when the inductor branch module C1 exists, the number of internal inductor branches has an effect on the output power of the embodiment 1; (iii) the amplitude difference or level difference of v AC1 and v ac1 also has an effect on the output power of the embodiment 1.

[0061] In addition, the inductance of the inductor branch module also has an effect on the output characteristics (including output power and output current ripple) of the embodiment 1.

[0062] Based on the above characteristics, the output characteristic adjustment method of the embodiment 1 is applied, including any combination of the following steps:

[0063] Step 1: increase or decrease the number of inductance branch module C1 (0 to 1);

[0064] Step 2: increase or decrease the number of inductance branches in the inductance branch module (0 to 4); Step 3: change the inductance value (L a1 or / and L b1 or / and L c1 or / and L d1 ) in the inductance branch module;

[0065] Step 4: change the amplitude or level value (A*V AC1 ) of the alternating current source v ac1 connected to the complete power module M1;

[0066] Step 5: change the amplitude or level value (V ac1 ) of the alternating current source v ac1 connected to the simplified power module S1.

[0067] Embodiment 2

[0068] Referring to Figure 2 , a rectifier circuit including a bridge rectifier power module includes at least one complete power module, at least one simplified power module, and at least one inductance branch module. Among them, one complete power module is M1, one simplified power module is S1, and one inductance branch module is C1.

[0069] The simplified power module S1 includes a transformer T 2a , a diode D 2a , and a diode D 2b . The 2 ports of the primary winding of the transformer T 2a are connected to the alternating current source v ac1 , and the 2 ports of the secondary winding are the intermediate ports 1_a and 1_b; the diode D 2a , the anode of which is connected to the first intermediate port 1_a of S1, and the cathode of which is connected to the positive end V o of the DC bus or the first end of the load; the diode D + , the anode of which is connected to the second intermediate port 1_b of S1, and the cathode of which is connected to the positive end V 2b of the DC bus or the first end of the load. +

[0070] The inductance branch module C1 includes 2 inductance branches. The first inductance branch includes an inductor L a2 , a diode D a2 , and a diode D b2 .and diode D b2 The cathode of diode D a2 is connected to one end of inductor L a2 , and the anode is the first current input end of the first inductor branch and is connected to the first intermediate port 1_A of M1; the cathode of diode D b2 is connected to one end of inductor L a2 , and the anode is the second current input end of the first inductor branch and is connected to the second intermediate port 1_B of M1; the other end of inductor L a2 is the current output end of the first inductor branch and is connected to the first intermediate port 1_a of S1. The second inductor branch is composed of inductor L b2 , diode D c2 , and diode D d2 The cathode of diode D c2 is connected to one end of inductor L b2 , and the anode is the first current input end of the second inductor branch and is connected to the first intermediate port 1_A of M1; the cathode of diode D d2 is connected to one end of inductor L b2 , and the anode is the second current input end of the second inductor branch and is connected to the second intermediate port 1_B of M1; the other end of inductor L b2 is the current output end of the second inductor branch and is connected to the second intermediate port 1_b of S1. The function of the diodes in the inductor branch is to limit the current direction and prevent circulating current. The number of inductor branches in C1 can be varied, with a variation range of 0 to 2.

[0071] The rest of the structure of Example 2 is the same as that of Example 1.

[0072] For the sake of understanding, Figure 3 only a part of the rectifier circuit of the entire bridge rectifier power module is shown, i.e., the complete power module M1, the simplified power module S1, and the inductor branch module C1. Taking the part shown as an example, the steady-state working process of the complete / simplified power module and the inductor branch module is introduced. When the complete power module works independently, it is a typical bridge rectifier working process, and thus is not described in detail. Figure 3

[0073] For the sake of simplicity, it is assumed that the complete power module M1 and the simplified power module S1 use the same components, i.e., the primary winding of transformer T 1A has the same name end relationship with the first port of the secondary winding thereof, and the primary winding of transformer T 2a has the same name end relationship with the first port 1_a of the secondary winding thereof; the AC power source v AC1 connected to the complete power module M1 is a three-level AC power source (+V AC1 , 0, -V AC1 ​), AC power source v ac1 (t) = v AC1 (t - t0), i.e. v AC1 and v ac1 have the same amplitude or level value, frequency and period, but different initial phases. Take t0 = T1 / 4 (T1 is the period) as an example. Figure 3 One working period T1 of the circuit shown can be divided into four stages, and one working condition is as follows:

[0074] (1) Stage 1: v AC1 = +V AC1 & v ac1 = 0

[0075] At this time, T 2a is equivalent to short circuit on the secondary side;

[0076] In the complete power module M1: D 1B and D 1C are turned on, D 1A and D 1D are turned off, (a) v AC1 passes through T 1A , D 1C , L S1A , the DC bus or load, D 1B to form the first loop;

[0077] In the simplified power module S1: D 2a and D 2b are turned on;

[0078] In the inductance branch module C1: D a2 and D c2 are turned on, D b2 and D d2 are turned off, (b) v AC1 passes through T 1A , D a2 , D b2 , L a2 , D 2a , the DC bus or load, D 1B to form the second loop; (c) v AC1 passes through T 1A , D c2 , L b2 , D a2 , D 2b , the DC bus or load, D 1B to form the third loop.

[0079] (2) Stage 2: v AC1 = 0 & v ac1 = +V AC1

[0080] At this time, T 1A The secondary side is equivalent to a short circuit;

[0081] In the complete power module M1: D 1A and D 1B are on, (a) D 1C are on until the current in the first loop consisting of L S1A , the DC bus or load, D 1A , D 1C is zero; (b) D 1D are on until the current in the second loop consisting of L S1A , the DC bus or load, D 1B , D 1D is zero;

[0082] In the simplified power module S1: D 2a is on, D 2b is off;

[0083] In the inductor branch module C1: D a2 , D b2 , D c2 and D d2 are on, (c) D 2a , the DC bus or load, D 1A , D 1B , D a2 , D b2 , L a2 constitute the third loop, in which the current flowing through the inductor L a2 is shared by D 1A and D 1B and D a2 and D b2 ; (d) v ac1 goes through T 2a and D 2a , the DC bus or load, D 1A , D 1B , D c2 , D d2 , L b2 constitute the fourth loop, in which the current flowing through the inductor L b2 is shared by D 1A and D 1B and D c2 and D d2 .

[0084] (3) Stage 3: v AC1 = -V AC1 & v ac1 = 0

[0085] At this time, T2a The secondary side is equivalent to short circuit;

[0086] In the complete power module M1: D 1A and D 1D are turned on, 1B and D 1C are turned off, (a) v AC1 is conducted through T 1A and D 1D , L S1A , the DC bus or load, D 1A constitutes the first loop;

[0087] In the simplified power module S1: D 2a and D 2b are turned on;

[0088] In the inductance branch module C1: D b2 and D d2 are turned on, a2 and D c2 are turned off, (b) v AC1 is conducted through T 1A and D b2 , L a2 , D 2a , D 2b , the DC bus or load, D 1A constitutes the second loop; (c) v AC1 is conducted through T 1A and D d2 , L b2 , D 2a , D 2b , the DC bus or load, D 1A constitutes the third loop.

[0089] (4) Stage 4: v AC1 = 0 & v ac1 = -V AC1

[0090] At this time, T 1A The secondary side is equivalent to short circuit;

[0091] In the complete power module M1: D 1A and D 1B are turned on, (a) D 1C is turned on until the current in the first loop constituted by L S1A , the DC bus or load, D 1A , D 1C is zero; (b) D 1D is turned on until the current in the first loop constituted by L S1A , the DC bus or load, D 1B , D 1DThe current in the second loop is zero;

[0092] Simplified power module S1: D 2b on, D 2a off;

[0093] Inductor branch module C1: D a2 , D b2 , D c2 and D d2 on, (c) v ac1 through T 2a and D 2b , DC bus or load, D 1A , D 1B , D a2 , D b2 , L a2 The third loop is composed of inductor L a2 , D 1A and D 1B , and D a2 and D b2 share the current; (d) D 2b , DC bus or load, D 1A , D 1B , D c2 , D d2 , L b2 The fourth loop is composed of inductor L b2 , D 1A and D 1B , and D c2 and D d2 share the current.

[0094] From the above working process, it can be seen that when the complete power module M1, the simplified power module S1 and the inductor branch module C1 work together, the electrical energy of the two alternating current sources is converted and supplied to the DC bus or load in an interleaved manner.

[0095] In order to facilitate understanding of the influence of the inductor branch module C1 on the output characteristics of the rectifier circuit containing the bridge rectifier power module, it is assumed that V AC1 = 12V, the period T1 of v AC1 = 90μs, the +V AC1 pulse width of v AC1 = T1 / 4, the-V AC1 pulse width of v AC1 = T1 / 4, the primary and secondary turns ratio of T 1A and T 2a is 1:2, the coupling coefficient is 0.999, and the DC bus voltage V o= 18V. Take 3 cases for further illustration, Case 1: t0=0; Case 2: t0=T / 8; Case 3: t0=T / 4.

[0096] Take L a2 = L b2 = 100μH, L S1A = 300μH, Figure 4 The output power performance of the embodiment 2 of the present application under the above 3 cases is given as follows, Figure 5 The output current ripple performance of the embodiment 2 of the present application under the above 3 cases is given as follows. From the above, Figure 4 and Figure 5 it can be known that (i) the "existence" and "nonexistence" of the inductance branch module C1 (the "nonexistence" is equivalent to the case that the number of internal inductance branches is 0) have an influence on the output characteristics of the embodiment 2; (ii) when the inductance branch module C1 exists, the number of internal inductance branches has a significant influence on the output characteristics of the embodiment 2; (iii) the phase difference between v AC1 and v ac1 also has an influence on the output characteristics of the embodiment 2.

[0097] In addition, the inductance value of the inductance in the inductance branch module also has an influence on the output characteristics of the embodiment 2.

[0098] Based on the above characteristics, the output characteristic adjustment method applicable to the embodiment 2 includes any combination of the following steps:

[0099] Step 1: increase or decrease the number of inductance branch modules C1 (0 to 1);

[0100] Step 2: increase or decrease the number of inductance branches in the inductance branch module (0 to 2);

[0101] Step 3: change the inductance value (L a2 or / and L b2 ) of the inductance in the inductance branch module;

[0102] Step 4: change the phase of the alternating current power v AC1 connected to the complete power module M1; Step 5: change the phase (t0) of the alternating current power v ac1 connected to the simplified power module S1.

[0103] Embodiment 3

[0104] Referring to Figure 6 , a rectifier circuit containing a bridge rectifier power module includes at least one complete power module, at least one simplified power module, and at least one inductance branch module.

[0105] Among them, one complete power module is M1, one simplified power module is S1, and one inductor branch module is C1.

[0106] The complete power module M1 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 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.

[0107] 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: Diode D a3 anode and inductor L a3 One end of the diode is connected, and its cathode is the first current output terminal of the first inductor branch and is connected to the first intermediate port 1_A of M1; diode D b3 anode and inductor L a3 One end of the inductor is connected, and its cathode is the second current output terminal of the first inductor branch and is connected to the second intermediate port 1_B of M1; inductor L a3 The other end is the current input terminal of the first inductor branch and is connected to the first intermediate port 1_a of S1. The second inductor branch is connected to inductor L. b3 Diode D c3 and diode D d3 Composition: Diode Dc3 anode and inductor L b3 One end is connected, and its cathode is the first current output terminal of the second inductor branch and is connected to the first intermediate port 1_A of M1; diode D d3 anode and inductor L b3 One end of the inductor is connected, and its cathode is the second current output terminal of the second inductor branch and is connected to the second intermediate port 1_B of M1; inductor L b3 The other end is the current input terminal of the second inductor branch and is connected to the second intermediate port 1_b of S1. The diode in the inductor branch serves to limit the current direction and prevent circulating current. The number of inductor branches in C1 is variable, ranging from 0 to 2.

[0108] The remaining structure is the same as in Example 1. Structurally, Example 3 and Example 2 are reciprocal. Except for the opposite direction of some currents, the working principle and effect of Example 3 are similar to or equivalent to those of Example 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 rectifier circuit with a bridge rectifier power module includes at least one complete power module, at least one simplified power module, and at least one inductor branch module. The complete power module is M1, the simplified power module is S1, and the inductor branch module is C1.

[0111] The complete power module M1 is the same as that in Embodiment 3, and the simplified power module S1 is the same as that in Embodiment 2.

[0112] The inductor branch module C1 includes one inductor branch. The inductor branch is connected to inductor L. a4 Diode D a4 Diode D b4 Diode D c4 Diode D d4 constitute:

[0113] Diode D a4 The anode is the first current input terminal of the inductor branch and is connected to the first intermediate port 1_A of M1, and its cathode is connected to the inductor L. a4 The first terminal is connected; diode D b4 The anode is the second current input terminal of the inductor branch and is connected to the second intermediate port 1_B of M1, and its cathode is connected to the inductor L. a4 The first terminal is connected; diode D c4 The cathode is the first current output terminal of the inductor branch and is connected to the first intermediate port 1_a of S1, while its anode is connected to the inductor L. a4 The second terminal is connected; diode Dd4 The cathode of the diode is the second current output end of the inductive branch and is connected to the second intermediate port 1_b of S1, and the anode is connected to the second end of the inductor L a4 The function of the diode in the inductive branch is to limit the current direction and prevent circulating current. The number of inductive branches in C1 can be varied, ranging from 0 to 1.

[0114] For the sake of understanding, Figure 7 Only a part of the rectifier circuit of the entire bridge rectifier power module is shown, including the complete power module M1, the simplified power module S1 and the inductive branch module C1. Taking the part shown as an example, Figure 7 the steady-state working process of the complete / simplified power module and the inductive branch module is introduced. When the complete power module works independently, it is a typical bridge rectifier working process, so it will not be described again.

[0115] For the sake of simplicity, it is assumed that the complete power module M1 and the simplified 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 of the transformer T 2a The first port of the primary winding and the first port 1_a of the secondary winding of the transformer T AC1 is a three-level alternating current source (+V AC1 , 0, -V AC1 ), with a period of T1, and the alternating current source v ac1 (t) = v AC1 (t / a), that is, v AC1 and v ac1 have the same amplitude or level value and initial phase, but different frequencies and periods. Taking a = 0.5 as an example, it is described as follows. Figure 7 One working cycle T1 of the circuit shown can be divided into 8 stages, and a typical working condition is as follows:

[0116] (1) Stage 1: v AC1 = +V AC1 & v ac1 = +V AC1

[0117] In the complete power module M1: D 2D is on, and D 2A , D 2B , and D 2C are off;

[0118] In the simplified power module S1: D 2a is on, and D 2b is off;

[0119] In the inductive branch module C1: Da4 , D d4 on, D b4 , D c4 off, (a) v AC1 through T 2A , v ac1 through T 2a and D a4 , L a4 , D d4 , D 2a , DC bus or load, L S2A , D 2D constitute the first loop.

[0120] (2) Phase 2: v AC1 = +V AC1 & v ac1 = 0

[0121] At this time, T 2a is equivalent to a short circuit on the secondary side;

[0122] In the complete power module M1: D 2A , D 2D on, D 2B , D 2C off, (a) v AC1 through T 2A and D 2A , L S2A , D 2D constitute the first loop;

[0123] In the simplified power module S1: D 2a , D 2b on;

[0124] In the inductance branch module C1: D a4 , D c4 , D d4 on, D b4 off, (b) v AC1 through T 2A and D a4 , L a4 , D c4 , D d4 , D 2a , D 2b , DC bus or load, L S2A , D 2D constitute the second loop, wherein the current flowing through L a4 is shared by D c4 and D d4 and D 2a and D 2b .

[0125] (3) Stage 3: v AC1 = 0 & v ac1 = -V AC1

[0126] At this time, T 2A secondary side is equivalent to short circuit;

[0127] In the complete power module M1: D 2C , D 2D are turned on, (a) D 2A , D 2B are turned on until the current in the first loop composed of L S2A , D 2C , D 2D , D 2A , D 2B , DC bus or load is zero;

[0128] In the simplified power module S1: D 2b is turned on, D 2a is turned off;

[0129] In the inductance branch module C1: D a4 , D b4 , D c4 are turned on, D d4 is turned off, (b) v ac1 is transferred through T 2a and D 2b , DC bus or load, L S2A , D 2C , D 2D , D a4 , D b4 , L a4 , D c4 composes the second loop.

[0130] (4) Stage 4: v AC1 = 0 & v ac1 = 0

[0131] At this time, T 2A secondary side and T 2a secondary side are equivalent to short circuit;

[0132] In the complete power module M1: D 2C , D 2D are turned on, D 2A , D 2B are turned off;

[0133] In the simplified power module S1: D 2a , D 2b are turned on;

[0134] In the inductance branch module C1: D a4 , Db4 , D c4 , D d4 conduct, (a) L a4 , D c4 , D d4 , D 2a , D 2b , DC bus or load, L S2A , D 2C , D 2D , D a4 , D b4 constitute the first loop, in which the current through L a4 is shared by D a4 and D b4 , D c4 and D d4 , D 2a and D 2b , and D 2C and D 2D .

[0135] (5) Stage 5: v AC1 = -V AC1 & v ac1 = +V AC1

[0136] In the complete power module M1: D 2C conduct, D 2A , D 2B , D 2D are off;

[0137] In the simplified power module S1: D 2a conduct, D 2b are off;

[0138] In the inductance branch module C1: D b4 , D d4 conduct, D a4 , D c4 are off, (a) v AC1 through T 2A , v ac1 through T 2a and D b4 , L a4 , D d4 , D 2a , DC bus or load, L S2A , D 2C constitute the first loop.

[0139] (6) Stage 6: v AC1 = -V AC1 & v ac1 = 0

[0140] At this time, T2a The secondary side corresponds to a short circuit;

[0141] In the complete power module M1: D 2B , D 2C is on, D 2A , D 2D is off, (a) v AC1 is conducted through T 2A and D 2B , the DC bus or load, L S2A , D 2C forms the first loop;

[0142] In the simplified power module S1: D 2a , D 2b is on;

[0143] In the inductance branch module C1: D b4 , D c4 , D d4 is on, D a4 is off, (b) v AC1 is conducted through T 2A and D b4 , L a4 , D c4 , D d4 , D 2a , D 2b , the DC bus or load, L S2A , D 2C forms the second loop, in which the current flowing through L a4 is shared by D c4 and D d4 , and D 2a and D 2b .

[0144] (7) Stage 7: v AC1 = 0 & v ac1 = -V AC1

[0145] At this time, T 2A The secondary side corresponds to a short circuit;

[0146] In the complete power module M1: D 2C , D 2D is on, (a) D 2A , D 2B is on until the current in the first loop formed by L S2A , D 2C , D 2D , D 2A , D 2B , the DC bus or load is zero;

[0147] Simplified power module S1: D 2b On, D 2a Off;

[0148] Inductor branch module C1: D a4 , D b4 , D c4 On, D d4 Off, (b) v ac1 Through T 2a and D 2b , DC bus or load, L S2A , D 2C , D 2D , D a4 , D b4 , L a4 , D c4 Make up the second loop.

[0149] (8) Stage 8: v AC1 = 0 & v ac1 = 0

[0150] At this time, T 2A secondary and T 2a secondary are equivalent to short circuit;

[0151] Complete power module M1: D 2C , D 2D On, D 2A , D 2B Off;

[0152] Simplified power module S1: D 2a , D 2b On;

[0153] Inductor branch module C1: D a4 , D b4 , D c4 , D d4 On, (a) L a4 , D c4 , D d4 , D 2a , D 2b , DC bus or load, L S2A , D 2C , D 2D , D a4 , D b4 Make up the first loop, in which the current flowing through L a4 is controlled by D a4 and D b4 , D c4 and D d4 , D 2a and D 2b , and D2C and D 2D Share the burden.

[0154] As can be seen from the above working process, when the complete power module M1, the simplified 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 load.

[0155] To better understand the impact of the inductor branch module C1 on the output characteristics of the entire rectifier circuit of the bridge-type rectifier power module, we 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 also T1 / 4, T 2A and T 2a The primary and secondary turns ratios are both 1:2, the coupling coefficient is 0.999, and the DC bus voltage V o =18V. Two cases will be considered for further explanation: Case 1: a = 0.5; Case 2: a = 1.

[0156] Take L a4 =100μH,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.

[0157] Furthermore, the inductance value of the inductor in the inductor branch module also affects the output characteristics of Example 4.

[0158] Based on the above characteristics, the output characteristic adjustment method of Embodiment 4 includes any combination of the following steps:

[0159] Step 1: Increase or decrease the number of inductor branch modules C1 (from 0 to 1);

[0160] Step 2: Increase or decrease the number of inductor branches in the inductor branch module (0 to 1);

[0161] Step 3: change the inductance value (L a4 ) of the inductor in the inductor branch module;

[0162] Step 4: change the frequency or period (T1) of the AC power source v AC1 connected to the complete power module M1;

[0163] Step 5: change the frequency or period (a·T1) of the AC power source v ac1 connected to the simplified power module S1.

[0164] As described in the summary, both the complete power module and the simplified power module have two preferred structures, and the two different simplified power modules also have four preferred inductor branch modules respectively. After permutation and combination, at least 16 embodiments can be formed. Only typical embodiments 1 to 4 are selected for description and explanation, and the remaining embodiments are not enumerated and described in detail because their working principles are similar.

[0165] Although diodes are used in the above-mentioned embodiments to perform freewheeling and energy transmission at the secondary side of the transformer, those skilled in the art can understand that the above-mentioned diodes can be replaced by controllable switching devices (such as synchronous rectification MOSFETs). In addition, the AC power source in the above-mentioned embodiments can be an AC-AC, DC-AC, or other power (electronic) devices with AC output; the transformer parameters (such as the primary and secondary winding numbers, excitation inductance, same and different name end relationship, etc.) in the complete power module and the simplified power module can be the same or different. The number of inductor branches, component composition, and component connection mode in the inductor branch module can be selected and adjusted according to specific applications. In addition to inductors and diodes, the above-mentioned inductor branches can additionally include other types of components or combinations of components, and these variations do not exceed the protection scope of the present application. The content described in the embodiments of the present application is only a list of implementation forms of the inventive concept, and the protection scope of the present application should not be considered as limited to the specific forms stated in the embodiments, and the protection scope of the present application also extends to equivalent technical means that those skilled in the art can think of according to the inventive concept.

Claims

1. A rectifier circuit comprising a full power module, a simplified power module and an inductor branch module, wherein: the full power module comprises: a first transformer, two ports of a primary winding of which are connected to a first AC power source, two ports of a secondary winding of which are respectively a first intermediate port and a second intermediate port of the full power module; a first diode, a cathode of which is connected to the first intermediate port of the full power module, an anode of which is connected to a negative terminal of a DC bus or a second terminal of a load; a second diode, a cathode of which is connected to the second intermediate port of the full power module, an anode of which is connected to the negative terminal of the DC bus or the second terminal of the load; a third diode, an anode of which is connected to the first intermediate port of the full power module; a fourth diode, an anode of which is connected to the second intermediate port of the full power module; and a first inductor, one end of which is connected to cathodes of the third diode and the fourth diode, the other end of which is connected to a positive terminal of the DC bus or a first terminal of the load; the simplified power module comprises: a second transformer, two ports of a primary winding of which are connected to a second AC power source, two ports of a secondary winding of which are respectively a first intermediate port and a second intermediate port of the simplified power module; a fifth diode, a cathode of which is connected to the first intermediate port of the simplified power module, an anode of which is connected to the negative terminal of the DC bus or the second terminal of the load; and a sixth diode, a cathode of which is connected to the second intermediate port of the simplified power module, an anode of which is connected to the negative terminal of the DC bus or the second terminal of the load; the inductor branch module comprises at least one inductor branch, wherein: the inductor branch comprises an inductor and a diode, and has a current input end and a current output end, the current input end of the inductor branch is connected to the first or second intermediate port of the simplified power module, the current output end of the inductor branch is connected to the first or second intermediate port of the full power module.

2. A rectifier circuit comprising a full power module, a simplified power module and an inductor branch module, wherein: the full power module comprises: a first transformer, two ports of a primary winding of which are connected to a first AC power source, two ports of a secondary winding of which are respectively a first intermediate port and a second intermediate port of the full power module; a first diode, a cathode of which is connected to the first intermediate port of the full power module, an anode of which is connected to a negative terminal of a DC bus or a second terminal of a load; a second diode, a cathode of which is connected to the second intermediate port of the full power module, an anode of which is connected to the negative terminal of the DC bus or the second terminal of the load; a third diode, an anode of which is connected to the first intermediate port of the full power module; a fourth diode, an anode of which is connected to the second intermediate port of the full power module; and a first inductor, one end of which is connected to cathodes of the third diode and the fourth diode, the other end of which is connected to a positive terminal of the DC bus or a first terminal of the load; the simplified power module comprises: a second transformer, two ports of a primary winding of the second transformer are connected to the second AC power source, two ports of a secondary winding of the second transformer are the first intermediate port and the second intermediate port of the simplified power module, respectively; a fifth diode, an anode of the fifth diode is connected to the first intermediate port of the simplified power module, a cathode of the fifth diode is connected to the positive terminal of the DC bus or the first terminal of the load; and a sixth diode, an anode of the sixth diode is connected to the second intermediate port of the simplified power module, a cathode of the sixth diode is connected to the positive terminal of the DC bus or the first terminal of the load; the inductor branch module comprises at least one inductor branch, wherein: the inductor branch comprises an inductor and a diode, and has a current input end and a current output end, the current input end of the inductor branch is connected to the first or second intermediate port of the complete power module, and the current output end of the inductor branch is connected to the first or second intermediate port of the simplified power module.

3. A rectifier circuit comprising a bridge rectifier power module, comprising a complete power module, a simplified power module and an inductor branch module, wherein: the complete power module comprises: a first transformer, two ports of a primary winding of the first transformer are connected to the first AC power source, two ports of a secondary winding of the first transformer are the first intermediate port and the second intermediate port of the complete power module, respectively; a first diode, an anode of the first diode is connected to the first intermediate port of the complete power module, a cathode of the first diode is connected to the positive terminal of the DC bus or the first terminal of the load; a second diode, an anode of the second diode is connected to the second intermediate port of the complete power module, a cathode of the second diode is connected to the positive terminal of the DC bus or the first terminal of the load; a third diode, a cathode of the third diode is connected to the first intermediate port of the complete power module; a fourth diode, a cathode of the fourth diode is connected to the second intermediate port of the complete power module; and a first inductor, one end of the first inductor is connected to anodes of the third diode and the fourth diode, the other end of the first inductor is connected to the negative terminal of the DC bus or the second terminal of the load; the simplified power module comprises: a second transformer, two ports of a primary winding of the second transformer are connected to the second AC power source, two ports of a secondary winding of the second transformer are the first intermediate port and the second intermediate port of the simplified power module, respectively; a fifth diode, a cathode of the fifth diode is connected to the first intermediate port of the simplified power module, an anode of the fifth diode is connected to the negative terminal of the DC bus or the second terminal of the load; and a sixth diode, a cathode of the sixth diode is connected to the second intermediate port of the simplified power module, an anode of the sixth diode is connected to the negative terminal of the DC bus or the second terminal of the load; the inductor branch module comprises at least one inductor branch, wherein: the inductor branch comprises an inductor and a diode, and has a current input end and a current output end, the current input end of the inductor branch is connected to the first or second intermediate port of the complete power module, and the current output end of the inductor branch is connected to the first or second intermediate port of the simplified power module.

4. A rectifier circuit comprising a bridge rectifier power module, comprising a complete power module, a simplified power module and an inductor branch module, wherein: the complete power module comprises: a first transformer, two ports of a primary winding of the first transformer being connected to the first AC power source, two ports of a secondary winding of the first transformer being the first intermediate port and the second intermediate port of the full power module, respectively; a first diode, an anode of the first diode being connected to the first intermediate port of the full power module, a cathode of the first diode being connected to the positive terminal of the DC bus or the first terminal of the load; a second diode, an anode of the second diode being connected to the second intermediate port of the full power module, a cathode of the second diode being connected to the positive terminal of the DC bus or the first terminal of the load; a third diode, a cathode of the third diode being connected to the first intermediate port of the full power module; a fourth diode, a cathode of the fourth diode being connected to the second intermediate port of the full power module; and a first inductor, one end of the first inductor being connected to anodes of the third diode and the fourth diode, the other end of the first inductor being connected to the negative terminal of the DC bus or the second terminal of the load; the simplified power module comprises: a second transformer, two ports of a primary winding of the second transformer being connected to the second AC power source, two ports of a secondary winding of the second transformer being the first intermediate port and the second intermediate port of the simplified power module, respectively; a fifth diode, an anode of the fifth diode being connected to the first intermediate port of the simplified power module, a cathode of the fifth diode being connected to the positive terminal of the DC bus or the first terminal of the load; and a sixth diode, an anode of the sixth diode being connected to the second intermediate port of the simplified power module, a cathode of the sixth diode being connected to the positive terminal of the DC bus or the first terminal of the load; the inductor branch module comprises at least one inductor branch, wherein: the inductor branch comprises an inductor and a diode, and has a current input end and a current output end, the current input end of the inductor branch being connected to the first or second intermediate port of the full power module, the current output end of the inductor branch being connected to the first or second intermediate port of the simplified power module.

5. The bridge rectifier power module comprising rectifier circuit according to any one of claims 1 to 4, wherein the inductor branch comprises a seventh diode and a second inductor connected in series.

6. The bridge rectifier power module comprising rectifier circuit according to any one of claims 1 to 4, wherein the inductor branch comprises: a seventh diode, an anode of the seventh diode being the first current input end of the inductor branch; an eighth diode, an anode of the eighth diode being the second current input end of the inductor branch; and a second inductor, one end of the second inductor being connected to cathodes of the seventh diode and the eighth diode, the other end of the second inductor being the current output end of the inductor branch.

7. The bridge rectifier power module comprising rectifier circuit according to any one of claims 1 to 4, wherein the inductor branch comprises: a seventh diode, a cathode of the seventh diode being the first current output end of the inductor branch; an eighth diode, a cathode of the eighth diode being the second current output end of the inductor branch; and a second inductor, one end of the second inductor being connected to anodes of the seventh diode and the eighth diode, the other end of the second inductor being the current input end of the inductor branch.

8. The bridge rectifier power module comprising rectifier circuit according to any one of claims 1 to 4, wherein the inductor branch comprises: a seventh diode, an anode of the seventh diode being the first current input end of the inductor branch; an eighth diode, an anode of the eighth diode being the second current input end of the inductor branch; ​ ​ a ninth diode having its cathode connected to a first current output of the inductor branch; a twelfth diode having its cathode connected to a second current output of the inductor branch; and a second inductor having one end connected to the cathodes of the seventh and eighth diodes and having the other end connected to the anodes of the ninth and twelfth diodes.

9. A bridge rectifier power module containing rectifier circuit as claimed in any one of claims 1 to 4, wherein some or all of the diodes are replaced by controllable switching devices.

10. A method of adjusting the output characteristics of a bridge rectifier power module containing rectifier circuit as claimed in any one of claims 1 to 4, comprising any combination of the following steps: Step 1 : increasing or decreasing the number of inductor branch modules; Step 2: increasing or decreasing the number of inductor branches in an inductor branch module; Step 3: changing the inductance of an inductor in an inductor branch module; Step 4: changing the operating parameters of a first AC power source connected to a full power module; Step 5: changing the operating parameters of a second AC power source connected to a simplified power module.

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