CN114301290A - Auxiliary converter circuit and auxiliary converter - Google Patents
Auxiliary converter circuit and auxiliary converter Download PDFInfo
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- CN114301290A CN114301290A CN202111387058.2A CN202111387058A CN114301290A CN 114301290 A CN114301290 A CN 114301290A CN 202111387058 A CN202111387058 A CN 202111387058A CN 114301290 A CN114301290 A CN 114301290A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention discloses an auxiliary converter circuit and an auxiliary converter, comprising: the circuit comprises an input stage circuit, a series resonant converter, a rectification module and a three-phase inversion module. The input stage circuit comprises a three-level Boost converter and is used for obtaining a controllable direct current bus; the series resonance converter is connected with the input stage circuit and is used for performing resonance conversion on the direct current bus; the rectification module is connected with the series resonant converter and is used for rectifying the current after the resonant conversion; and the three-phase inversion module is connected with the series resonant converter and is used for converting three-phase alternating current of the current subjected to resonant conversion. The auxiliary converter circuit can realize bidirectional charging, and in an emergency power supply mode, power is directly supplied from a direct current output port through a power supply such as a storage battery, and a three-phase alternating current can be output from an alternating current side. When the auxiliary converter circuit provided by the invention is used as a component of the auxiliary converter, the weight and the volume are reduced, and the efficiency is improved.
Description
Technical Field
The invention relates to the technical field of electronic power, in particular to an auxiliary converter circuit and an auxiliary converter.
Background
At present, the vehicle-mounted power supply technology develops towards the direction of intellectualization, high frequency, modularization and miniaturization. The auxiliary converter is used as one of core devices of rail vehicles such as subways, high-speed rails and motor trains, and provides electric energy for train illumination, air conditioners, whole vehicle control systems and the like. The power frequency technology commonly used in the industry at present can realize functions, but the product has huge volume, which causes the problems of heavy weight and high loss; some manufacturers use the intermediate frequency technology, but need to use special devices, and the switching frequency is low, the main circuit is complicated and the like, which limits the large-scale application of the intermediate and high frequency technology, and the popularization degree is not high at present.
Disclosure of Invention
In order to solve the above technical problems, an object of the present invention is to provide an auxiliary converter circuit and an auxiliary converter.
In one aspect, an embodiment of the present invention includes an auxiliary current transformer circuit, including: the circuit comprises an input stage circuit, a series resonant converter, a rectification module and a three-phase inversion module;
the input stage circuit comprises a first three-level Boost circuit (1) and a second three-level Boost circuit (2), wherein the first three-level Boost circuit (1) is connected with the second three-level Boost circuit (2) in series, a first direct current bus is led out from the first three-level Boost circuit (1), and a second direct current bus is led out from the second three-level Boost circuit (2);
the series resonant converter comprises a first half-bridge switching circuit (3), a second half-bridge switching circuit (4), a first high-frequency transformer (9), a second high-frequency transformer (10), a third high-frequency transformer (11), a fourth high-frequency transformer (12), a first bridge circuit (13), a second bridge circuit (14), a third bridge circuit (15) and a fourth bridge circuit (16), wherein one end of the first half-bridge switching circuit (3) is connected with a first direct current bus, the other end of the first half-bridge switching circuit (3), one end of the first high-frequency transformer (9) and one end of the second high-frequency transformer (10) are connected, one end of the second half-bridge switching circuit (4) is connected with a second direct current bus, the other end of the second half-bridge switching circuit (4) and one end of the third high-frequency transformer (11) are connected with one end of the fourth high-frequency transformer (12), the other end of the first high-frequency transformer (9) is connected with the input end of a first bridge circuit (13), the other end of the second high-frequency transformer (10) is connected with the input end of a second bridge circuit (14), the other end of the third high-frequency transformer (11) is connected with the input end of a third bridge circuit (15), and the other end of the fourth high-frequency transformer (12) is connected with the input end of a fourth bridge circuit (16);
the rectification module comprises a DC/DC converter (18), wherein an input end (18) of the DC/DC converter, an output end of the second bridge circuit (14) and an output end of the fourth bridge circuit (16) are connected;
the three-phase inversion module comprises a three-phase inverter (19), and the input end of the three-phase inverter (19), the output end of the first bridge circuit (13) and the output end of the third bridge circuit (15) are connected.
Furthermore, the first three-level Boost converter (1) comprises a first switching tube, a second switching tube, a first capacitor and a second capacitor, wherein a first end of the first switching tube is used as a first input end of the input stage circuit, and a second end of the first switching tube, a first end of the second switching tube, a second end of the first capacitor and a first end of the second capacitor are connected;
the second third level Boost converter (2) comprises a third switching tube, a fourth switching tube, a third capacitor and a fourth capacitor, wherein the second end of the fourth switching tube is used as the second input end of the input stage circuit, the first end of the third switching tube is connected with the second end of the second switching tube, and the second end of the third switching tube, the first end of the fourth switching tube, the second end of the third capacitor and the first end of the fourth capacitor are connected;
the first end of the first capacitor is used as the first output end of the input stage circuit, the second end of the second capacitor is used as the second output end of the input stage circuit, the first end of the third capacitor is used as the third input end of the input stage circuit, and the second end of the fourth capacitor is used as the fourth input end of the input stage circuit.
Further, the series resonant converter further includes:
a first resonance capacitor (5), a second resonance capacitor (6), a third resonance capacitor (7) and a fourth resonance capacitor (8);
the first resonant capacitor (5) is positioned between the first half-bridge switch circuit (3) and the first high-frequency transformer (9);
the second resonant capacitor (6) is positioned between the first half-bridge switch circuit (3) and the second high-frequency transformer (10);
the third resonant capacitor (7) is positioned between the second half-bridge switching circuit (4) and the third high-frequency transformer (11);
a fourth resonant capacitor (8) is located between the second half-bridge switching circuit (4) and a fourth high-frequency transformer (12).
Furthermore, the parameters of the first resonant capacitor (5) and the third resonant capacitor (7) are consistent, the parameters of the first high-frequency transformer (9) and the third high-frequency transformer (11) are consistent, the parameters of the second resonant capacitor (6) and the fourth resonant capacitor (8) are consistent, and the parameters of the second high-frequency transformer (10) and the fourth high-frequency transformer (12) are consistent; the resonant frequency of a resonant circuit formed by the first half-bridge switching circuit (3), the first resonant capacitor (5) and the first high-frequency transformer (9) is consistent with the resonant frequency of a resonant circuit formed by the second half-bridge switching circuit (4), the third resonant capacitor (7) and the third high-frequency transformer (11); the resonant frequency of the resonant circuit formed by the first half-bridge switching circuit (3), the second resonant capacitor (6) and the second high-frequency transformer (10) is consistent with the resonant frequency of the resonant circuit formed by the second half-bridge switching circuit (4), the fourth resonant capacitor (8) and the fourth high-frequency transformer (12).
Further, the rectifier module further includes:
a contactor (20), a first diode (17) and a second diode (21);
the first end of the contactor (20), the first output end of the second bridge circuit (14), the first output end of the fourth bridge circuit (16) and the first end of the first diode (17) are connected;
the second end of the contactor (20), the second end of the first diode (17) and the first end of the second diode (21) are connected;
the second terminal of the second diode (21) is connected to the first output terminal of the DC/DC converter (18).
Further, the three-phase inversion system further comprises:
a parallel inductor (22) and an LC filter (23);
one end of the LC filter (23) is connected with the three-phase inverter (19), and the other end of the LC filter (23) is connected with the parallel machine inductor (22).
Further, the three-phase inverter (19) is a T-type three-level inverter or a two-level three-phase four-leg inverter.
Furthermore, COOLMOS, VDMOS, IGBT and SiC semiconductor devices are used as the first switching tube, the second switching tube, the third switching tube and the fourth switching tube.
On the other hand, the embodiment of the invention also comprises an auxiliary converter, which comprises:
in an embodiment, the converter comprises an auxiliary converter circuit and a control module, wherein the control module is used for controlling the operation of the auxiliary converter circuit in a normal mode and an emergency mode.
Further, the control module is configured to control operations of the auxiliary converter circuit in the normal mode and the emergency mode, including:
in a normal mode, controlling the input stage circuit, the series resonant converter, the rectifying module and the three-phase inversion module to normally work, controlling current to be input from the input stage circuit, and outputting current after current transformation by the rectifying module and the three-phase inversion module;
in an emergency mode, the input stage circuit, the first half-bridge switching circuit (3) and the second half-bridge switching circuit (4) are controlled to be in a standby state, control current is input from the rectifying module, and the three-phase inverter module outputs variable current.
The invention has the beneficial effects that: when selecting conventional devices for use to reduce cost, two sets of three-level Boost converters are connected in series for use, so that high-voltage current enters a circuit from two ports, two sets of stable direct-current buses are obtained through Boost conversion, the two sets of direct-current buses are respectively processed, a rectification module can be used for obtaining stable direct-current voltage, a three-phase inversion module can be used for outputting three-phase alternating current, the voltage stress of a single set of switching tubes is greatly reduced, the three-phase inverter can be applied to occasions with high-voltage current and large voltage conversion in medium-high frequency technology, and the product can achieve the effects of greatly reducing weight, reducing volume and improving efficiency.
Drawings
FIG. 1 is a schematic diagram of an auxiliary current transformer circuit in an embodiment;
FIG. 2 is a schematic diagram of an input stage circuit in an embodiment;
FIG. 3 is a schematic diagram of an exemplary series resonant converter;
FIG. 4 is a schematic diagram of the rectifier module in the normal mode in the embodiment;
FIG. 5 is a schematic diagram of an embodiment of a rectifier module in an emergency mode;
fig. 6 is a schematic diagram of a three-phase inverter module.
Description of reference numerals:
1-a first three-level Boost circuit;
2-a second third level Boost circuit;
3-a first half-bridge switching circuit;
4-a second half-bridge switching circuit;
5-a first resonant capacitance;
6-a second resonant capacitor;
7-a third resonant capacitor;
8-a fourth resonant capacitor;
9-a first high frequency transformer;
10-a second high frequency transformer;
11-a third high frequency transformer;
12-a fourth high frequency transformer;
13-a first bridge circuit;
14-a second bridge circuit;
15-a third bridge circuit;
16-a fourth bridge circuit;
17-a first diode;
an 18-DC/DC converter;
19-a three-phase inverter;
20-a contactor;
21-a second diode;
22-parallel machine inductance;
23-LC filter.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic diagram of an auxiliary current transformer circuit provided in the present invention, and as shown in fig. 1, the present embodiment provides an auxiliary current transformer circuit, including: the circuit comprises an input stage circuit, a series resonant converter, a rectification module and a three-phase inversion module.
In a normal mode of the circuit, current is input from an input stage circuit, the input stage circuit adopts a first three-level Boost circuit 1 and a second three-level Boost circuit 2 which are connected in series, a first direct current bus is led out from the first three-level Boost circuit 1, a second direct current bus is led out from the second three-level Boost circuit 2, the first direct current bus is connected with a first half-bridge switch circuit 3, the second direct current bus is connected with a second half-bridge switch circuit 4, the two switches operate independently, the output end of the first half-bridge switch circuit 3 is connected with the primary sides of two groups of first high-frequency transformers 9 and the second high-frequency transformers 10 which are connected in parallel, the output end of the second half-bridge switch circuit 4 is connected with the primary sides of two groups of third high-frequency transformers 11 and the fourth high-frequency transformers 12 which are connected in parallel, the parameters of the second high-frequency transformers 10 and the fourth high-frequency transformers 12 are consistent and are mainly used for providing energy for a rear-stage rectification module, the first high-frequency transformer 9 and the third high-frequency transformer 11 have the same parameters and provide energy for the rear-stage three-phase inversion module. After transformer isolation, the secondary side of the first high-frequency transformer 9 is connected to a first bridge circuit 13, the secondary side of the second high-frequency transformer 10 is connected to a second bridge circuit 14, the secondary side of the third high-frequency transformer 11 is connected to a third bridge circuit 15, and the secondary side of the fourth high-frequency transformer 12 is connected to a fourth bridge circuit 16. The current is rectified by the secondary sides of the second high-frequency transformer 10 and the fourth high-frequency transformer 12, then one path of the current directly outputs direct current voltage through the first diode 17, and the other path of the current outputs direct current voltage through the DC/DC converter 18. The current is rectified by the secondary sides of the first high-frequency transformer 9 and the third high-frequency transformer 11 to provide energy for the three-phase inverter 19, and the three-phase inverter 19 outputs three-phase alternating current.
In the circuit, a second bridge circuit 14 and a fourth bridge circuit 16 can be selected to be bidirectional energy flow according to actual needs, in an emergency mode, a contactor 20 is closed, a power supply is input through a rectification module, current enters the second bridge circuit 14 and the fourth bridge circuit 16 after passing through a second diode 21 and the contactor 20, the second bridge circuit 14 and the fourth bridge circuit 16 convert direct current into alternating current, the energy is transmitted to primary sides of a first high-frequency transformer 9 and a third high-frequency transformer 11 through secondary sides of a second high-frequency transformer 10 and a fourth high-frequency transformer 12, the energy of the first high-frequency transformer 9 and the third high-frequency transformer 11 is transmitted to the secondary sides of the first high-frequency transformer 9 and the third high-frequency transformer 11 again, bus voltage is provided for a three-phase inverter 19, and the three-phase inverter 19 outputs the alternating current.
It should be noted that, for convenience of understanding, the present embodiment adopts a manner of explaining and explaining the whole circuit by flowing current through the auxiliary current transformation circuit, but the current does not need to actually flow through the circuit, and only the purpose of clarity is to perform simulation demonstration. The division of each part in the circuit is also for convenience of description, and actually there is no relative independent relationship, and devices in the circuit can be combined to complete the problem to be solved by the invention and the final effect of the auxiliary variable current circuit. Some of the devices in the circuit are also optimized for the circuit, with appropriate additions or subtractions of related devices.
With reference to the schematic diagram of the input stage circuit shown in fig. 2, the input stage circuit adopts a first three-level Boost circuit 1 and a second three-level Boost circuit 2 connected in series, a first dc bus is led out from the first three-level Boost circuit 1, a second dc bus is led out from the second three-level Boost circuit 2, and the first three-level Boost circuit 1 and the second three-level Boost circuit 2 are connected in series for use, so that the voltage stress of a single group of switching tubes is greatly reduced, and the input voltage is suitable for a scene with large variation of input voltage such as 1500V input of a railway vehicle, in the circuit, four groups of switching tubes of V1, V2, V3 and V4 work alternately, and capacitors C1, C2, C3 and C4 are charged alternately by increasing the inductive voltage, so that two groups of controllable dc buses with a neutral point are obtained, wherein diodes are added between the switching tubes and the capacitors to ensure the flow direction of current, optimize the circuit structure, or replace other circuit elements, the input stage circuit is used for converting a high-voltage current which can be input into a controllable direct-current bus, other current structures with the function can be used for replacing the input stage circuit, the specific number of elements in the circuit structures is not required to be clear, and corresponding components can be properly increased or reduced.
Referring to the schematic diagram of the series resonant converter shown in fig. 3, the series resonant converter includes a first half-bridge switching circuit 3, a second half-bridge switching circuit 4, a first high-frequency transformer 9, a second high-frequency transformer 10, a third high-frequency transformer 11, a fourth high-frequency transformer 12, a first bridge circuit 13, a second bridge circuit 14, a third bridge circuit 15 and a fourth bridge circuit 16, one end of the first half-bridge switching circuit 3 is connected to a first dc bus, the other end of the first half-bridge switching circuit 3, one end of the first high-frequency transformer 9 and one end of the second high-frequency transformer 10 are connected, one end of the second half-bridge switching circuit 4 is connected to a second dc bus, the other end of the second half-bridge switching circuit 4 and one end of the third high-frequency transformer 11 are connected to one end of the fourth high-frequency transformer 12, the other end of the first high-frequency transformer 9 is connected to an input end of the first bridge circuit 13, the other end of the second high-frequency transformer 10 is connected to an input terminal of a second bridge circuit 14, the other end of the third high-frequency transformer 11 is connected to an input terminal of a third bridge circuit 15, and the other end of the fourth high-frequency transformer 12 is connected to an input terminal of a fourth bridge circuit 16. The first resonant capacitor 5 is positioned between the first half-bridge switch circuit 3 and the first high-frequency transformer 9; the second resonant capacitor 6 is positioned between the first half-bridge switch circuit 3 and the second high-frequency transformer 10; the third resonant capacitor 7 is located between the second half-bridge switching circuit 4 and the third high-frequency transformer 11; a fourth resonant capacitor 8 is located between the second half-bridge switching circuit 4 and a fourth high-frequency transformer 12. The first half-bridge switching circuit 3 and the second half-bridge switching circuit 4 are composed of two groups of half-bridge switching tubes.
The high-frequency transformer is preset with corresponding leakage inductance parameters, and the leakage inductance parameters, the resonant capacitor and the half-bridge switching tube form a series resonant circuit together to realize soft switching. The parameters of the first resonant capacitor 5 and the third resonant capacitor 7 are consistent, the parameters of the first high-frequency transformer 9 and the third high-frequency transformer 11 are consistent, the parameters of the second resonant capacitor 6 and the fourth resonant capacitor 8 are consistent, and the parameters of the second high-frequency transformer 10 and the fourth high-frequency transformer 12 are consistent; the resonant frequency of the resonant circuit formed by the first half-bridge switching circuit 3, the first resonant capacitor 5 and the first high-frequency transformer 9 is consistent with the resonant frequency of the resonant circuit formed by the second half-bridge switching circuit 4, the third resonant capacitor 7 and the third high-frequency transformer 11; the resonant frequency of the resonant circuit formed by the first half-bridge switching circuit 3, the second resonant capacitor 6 and the second high-frequency transformer 10 coincides with the resonant frequency of the resonant circuit formed by the second half-bridge switching circuit 4, the fourth resonant capacitor 8 and the fourth high-frequency transformer 12.
In combination with the schematic diagram of the rectification module in the normal mode shown in fig. 4, the energy of the system energy source and the input stage circuit, the energy of the second high-frequency transformer 10 and the energy of the fourth high-frequency transformer 12 are transmitted from the primary side to the secondary side, the secondary side is rectified by the second bridge circuit 14 and the fourth bridge circuit 16 to obtain a stable bus voltage, and one of the secondary sides is directly output through the contactor 20 to provide voltage for a load in a specific scene; the other path is output by the DC/DC converter 18 to charge the storage battery, and the purpose of adding the DC/DC converter 18 is to adjust the output voltage and meet the requirement of a temperature compensation curve needing electromagnetic charging. The diodes in the second bridge circuit 14 and the fourth bridge circuit 16 are equivalent to uncontrollable diodes in the normal mode, and control of the diodes is not required, and the number and connection manner of the diodes are not particularly limited, and the second bridge circuit 14 and the fourth bridge circuit 16 only function to rectify energy input to the corresponding bridge circuit, and the rectification is also for optimizing the circuit structure, and other circuit structures having the rectification function are also within the protection scope of the present invention. The flow direction after the battery and the output voltage is not in the auxiliary converter circuit, and the flow direction is only used for better explaining the effect of the auxiliary converter circuit.
In the schematic diagram of the rectifier module in the emergency mode shown in fig. 5, when the function is required, the diode in the circuit shown in fig. 4 may be replaced by a controllable device, and in the normal mode, a bridge rectifier circuit may still be formed by controlling the anti-parallel diode of the controllable device, which is the same as the principle in the prior art.
When the emergency mode is required, the input stage circuit has no energy input, the first three-level Boost circuit 1, the second three-level Boost circuit 2 and a part of circuits of the series resonant converter are in a standby state, and the rectifying circuit is connected with a storage battery, which refers to a connection condition of an auxiliary converter circuit and is used for convenience of description. In this state, the battery is connected to the terminal X12, the battery discharges, the voltage reaches the dc output bus X11 through the second diode 21, at this time, the trigger 20 sends out a closing command, the closing of the contactor 20 is equivalent to short-circuiting the first diode 17, so that the bus voltage reaches the two terminals of the second bridge circuit 14 and the fourth bridge circuit 16 through the contactor 20, and meanwhile, since the diodes in the second bridge circuit 14 and the fourth bridge circuit 16 are already switched to controllable devices, the dc power is converted into ac power by controlling the switches of the controllable devices, and the energy is transmitted from the secondary sides of the second high-frequency transformer 10 and the fourth high-frequency transformer 12 to the primary side.
Since the first high frequency transformer 9 is connected in parallel with the second high frequency transformer 10, the third high frequency transformer 11 is connected in parallel with the fourth high frequency transformer 12, the primary side of the first high frequency transformer 9 and the primary side of the third high frequency transformer 11 also generate an alternating voltage, because the transformer transformation ratio is fixed, according to the transformer characteristics, at this time, the secondary side of the first high-frequency transformer 9 and the secondary side of the third high-frequency transformer 11 also generate corresponding alternating-current voltages, the voltage generated by the first high-frequency transformer 9 is transmitted to the three-phase inversion module through the first bridge circuit 13, the voltage generated by the third high-frequency transformer 11 is transmitted to the three-phase inversion module through the third bridge circuit 15, the circuit rectified by the first bridge circuit 13 and the third bridge circuit 15 provides energy for the three-phase inverter 19 of the three-phase inverter module, and after the three-phase inverter 19 works by wave generation, the three-phase inverter module outputs three-phase alternating current.
With reference to the schematic diagram of the three-phase inverter module shown in fig. 6, the secondary sides of the first high-frequency transformer 9 and the third high-frequency transformer 11 are rectified by the first bridge circuit 13 and the third bridge circuit 15 to obtain a dc bus voltage of the three-phase inverter module, the dc bus voltage is at a midpoint, the dc power is converted into ac power by the three-phase inverter 19 having a T-type three-level structure, a two-level structure, and a three-phase four-leg structure, and the ac power is output through the LC filter 23 to obtain a quasi-sine wave, in the figure, the capacitance of the LC filter 23 is connected in a Y- Δ combination manner, and in a use situation where the ac power output needs to be connected to a grid, the inverter output needs to be added with the parallel operation inductor 22 to suppress the circulating current.
It should be noted that the switching tube used in the above embodiments may adopt a COOLMOS, VDMOS, IGBT, SiC semiconductor device, and a single set of series resonant bridge energy enters not less than two sets of resonant cavities.
The invention also provides an auxiliary converter, which comprises the auxiliary converter circuit and a control module in the embodiment, wherein the control module is used for controlling the operation of the auxiliary converter circuit in a normal mode and an emergency mode. The auxiliary converter can be applied to urban rail vehicles and high-speed rail and motor train vehicle systems, so that the weight of a product is reduced, the size is reduced, and the efficiency is improved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. An auxiliary converter circuit is characterized by comprising an input stage circuit, a series resonant converter, a rectifying module and a three-phase inversion module;
the input stage circuit comprises a first three-level Boost circuit (1) and a second three-level Boost circuit (2), wherein the first three-level Boost circuit (1) is connected with the second three-level Boost circuit (2) in series, a first direct current bus is led out from the first three-level Boost circuit (1), and a second direct current bus is led out from the second three-level Boost circuit (2);
the series resonant converter comprises a first half-bridge switching circuit (3), a second half-bridge switching circuit (4), a first high-frequency transformer (9), a second high-frequency transformer (10), a third high-frequency transformer (11), a fourth high-frequency transformer (12), a first bridge circuit (13), a second bridge circuit (14), a third bridge circuit (15) and a fourth bridge circuit (16), wherein one end of the first half-bridge switching circuit (3) is connected with a first direct current bus, the other end of the first half-bridge switching circuit (3), one end of the first high-frequency transformer (9) and one end of the second high-frequency transformer (10) are connected, one end of the second half-bridge switching circuit (4) is connected with a second direct current bus, the other end of the second half-bridge switching circuit (4) and one end of the third high-frequency transformer (11) are connected with one end of the fourth high-frequency transformer (12), the other end of the first high-frequency transformer (9) is connected with the input end of a first bridge circuit (13), the other end of the second high-frequency transformer (10) is connected with the input end of a second bridge circuit (14), the other end of the third high-frequency transformer (11) is connected with the input end of a third bridge circuit (15), and the other end of the fourth high-frequency transformer (12) is connected with the input end of a fourth bridge circuit (16);
the rectification module comprises a DC/DC converter (18), wherein an input end (18) of the DC/DC converter, an output end of the second bridge circuit (14) and an output end of the fourth bridge circuit (16) are connected;
the three-phase inversion module comprises a three-phase inverter (19), and the input end of the three-phase inverter (19), the output end of the first bridge circuit (13) and the output end of the third bridge circuit (15) are connected.
2. The auxiliary current transforming circuit of claim 1,
the first three-level Boost converter (1) comprises a first switching tube, a second switching tube, a first capacitor and a second capacitor, wherein the first end of the first switching tube is used as the first input end of the input-stage circuit, and the second end of the first switching tube, the first end of the second switching tube, the second end of the first capacitor and the first end of the second capacitor are connected;
the second third level Boost converter (2) comprises a third switching tube, a fourth switching tube, a third capacitor and a fourth capacitor, wherein the second end of the fourth switching tube is used as the second input end of the input stage circuit, the first end of the third switching tube is connected with the second end of the second switching tube, and the second end of the third switching tube, the first end of the fourth switching tube, the second end of the third capacitor and the first end of the fourth capacitor are connected;
the first end of the first capacitor is used as the first output end of the input stage circuit, the second end of the second capacitor is used as the second output end of the input stage circuit, the first end of the third capacitor is used as the third input end of the input stage circuit, and the second end of the fourth capacitor is used as the fourth input end of the input stage circuit.
3. The auxiliary current transformer circuit of claim 2, wherein the series resonant converter further comprises:
a first resonance capacitor (5), a second resonance capacitor (6), a third resonance capacitor (7) and a fourth resonance capacitor (8);
the first resonant capacitor (5) is positioned between the first half-bridge switch circuit (3) and the first high-frequency transformer (9);
the second resonant capacitor (6) is positioned between the first half-bridge switch circuit (3) and the second high-frequency transformer (10);
the third resonant capacitor (7) is positioned between the second half-bridge switching circuit (4) and the third high-frequency transformer (11);
a fourth resonant capacitor (8) is located between the second half-bridge switching circuit (4) and a fourth high-frequency transformer (12).
4. Auxiliary converter circuit according to claim 3, wherein said first (5) and third (7) resonant capacitors have the same parameters, said first (9) and third (11) high-frequency transformers have the same parameters, said second (6) and fourth (8) resonant capacitors have the same parameters, and said second (10) and fourth (12) high-frequency transformers have the same parameters; the resonant frequency of a resonant circuit formed by the first half-bridge switching circuit (3), the first resonant capacitor (5) and the first high-frequency transformer (9) is consistent with the resonant frequency of a resonant circuit formed by the second half-bridge switching circuit (4), the third resonant capacitor (7) and the third high-frequency transformer (11); the resonant frequency of the resonant circuit formed by the first half-bridge switching circuit (3), the second resonant capacitor (6) and the second high-frequency transformer (10) is consistent with the resonant frequency of the resonant circuit formed by the second half-bridge switching circuit (4), the fourth resonant capacitor (8) and the fourth high-frequency transformer (12).
5. An auxiliary current transformer circuit according to any one of claim 4, wherein the rectifier module further comprises:
a contactor (20), a first diode (17) and a second diode (21);
the first end of the contactor (20), the first output end of the second bridge circuit (14), the first output end of the fourth bridge circuit (16) and the first end of the first diode (17) are connected;
the second end of the contactor (20), the second end of the first diode (17) and the first end of the second diode (21) are connected;
the second terminal of the second diode (21) is connected to the first output terminal of the DC/DC converter (18).
6. An auxiliary current transformer circuit as claimed in any one of claims 5, wherein the three-phase inversion system further comprises:
a parallel inductor (22) and an LC filter (23);
one end of the LC filter (23) is connected with the three-phase inverter (19), and the other end of the LC filter (23) is connected with the parallel machine inductor (22).
7. Auxiliary converter circuit according to any of claims 1-4, characterized in that said three-phase inverter (19) is a T-type three-level inverter or a two-level, three-phase four-leg inverter.
8. The auxiliary variable current circuit of claim 2, wherein the first switching tube, the second switching tube, the third switching tube and the fourth switching tube use semiconductor devices of COOLMOS, VDMOS, IGBT and SiC.
9. An auxiliary converter, comprising:
-the auxiliary current transformer circuit of any one of claims 5-6;
and the control module is used for controlling the operation of the auxiliary converter circuit in the normal mode and the emergency mode.
10. The auxiliary converter as claimed in claim 8, wherein the control module for controlling the operation of the auxiliary converter circuit in the normal mode and the emergency mode comprises:
in a normal mode, controlling the input stage circuit, the series resonant converter, the rectifying module and the three-phase inversion module to normally work, controlling current to be input from the input stage circuit, and outputting current after current transformation by the rectifying module and the three-phase inversion module;
in an emergency mode, the input stage circuit, the first half-bridge switching circuit (3) and the second half-bridge switching circuit (4) are controlled to be in a standby state, control current is input from the rectifying module, and the three-phase inverter module outputs variable current.
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