High-frequency DC / DC converter circuit, converter module and railway vehicle

Abstract

The utility model provides a high-frequency DC / DC converter circuit, a converter module and a railway vehicle. A high-frequency DC / DC converter circuit for converting power from upstream and outputting the converted power to downstream comprises: an inverter circuit unit which includes an inverter circuit and inverts direct current from upstream into alternating current; a transformation circuit unit that includes a plurality of high-frequency transformers and that transforms the alternating current from the inverter circuit unit; and a rectifying circuit unit that includes a rectifying circuit, rectifies the alternating current from the plurality of high-frequency transformers of the transformer circuit unit into direct current, and superimposes and outputs the direct current to the downstream. The primary windings of the plurality of high-frequency transformers are connected in series with each other and connected with the inverter circuit through the resonant inductor, and the secondary windings of the plurality of high-frequency transformers are connected in parallel with each other and connected with the rectifier circuit; the primary windings are connected in parallel with each other and connected with the inverter circuit through the resonant inductors, and the secondary windings are connected in series with the rectifier circuit.

Description

Technical Field

[0001] The utility model relates to a high-frequency DC / DC current conversion circuit, and further relates to a high-frequency DC / DC current conversion module for railway vehicles applying the high-frequency DC / DC current conversion circuit and a railway vehicle using the high-frequency DC / DC current conversion module for railway vehicles. Background Art

[0002] For railway vehicles such as electric locomotives that use electricity from the power supply grid to operate, the power system includes a traction power supply system and an auxiliary power supply system. Among them, the traction power supply system supplies power from the power supply grid to the traction motor to drive the railway vehicle. In addition, the auxiliary power supply system is used to convert the power from the power supply grid into power that can be used by on-board electrical equipment such as lighting, air conditioning, and refrigerators to operate these on-board electrical equipment.

[0003] In recent years, with the increasing requirements of railway vehicles for the power density of auxiliary power supply systems, based on the continuous development of semiconductor technology, high-power and high-frequency LLC resonance technology has begun to be applied in auxiliary power supply systems. However, the maximum power of a single LLC resonance circuit in the past can generally only reach about 100kVA. Therefore, in order to meet the high power requirements, one of the current practices is to use a power module parallel solution to connect multiple LLC resonance circuits in parallel to expand the power.

[0004] As a representative circuit structure of this technology, Figure 8 As shown, it mainly includes multiple inverter circuits InC', multiple high-frequency transformers TrC' and multiple rectifier circuits ReC'. The inverter circuit InC', high-frequency transformer TrC' and rectifier circuit ReC' on the upper side of the figure together constitute a current conversion circuit, and the inverter circuit InC', high-frequency transformer TrC' and rectifier circuit ReC' on the lower side of the figure also together constitute a current conversion circuit. The two current conversion circuits are arranged in parallel with each other.

[0005] However, this circuit structure has the problem of power imbalance among the high-frequency transformers during operation (for example, the power of one high-frequency transformer becomes larger and larger while the power of another high-frequency transformer becomes smaller and smaller), resulting in the high-frequency circuit with high power being unable to operate normally due to overload and overheating.

[0006] In order to solve this problem, it is necessary to control the voltage and current of the two LLC resonant circuits, which increases the difficulty and cost of control.

[0007] Moreover, two independent inverter circuits / rectifier circuits require two sets of components (switching tubes, etc.) and corresponding control circuits, which will also lead to an increase in circuit costs. Utility Model Content

[0008] The utility model is proposed in view of the above actual situation, and its purpose is to provide a high-frequency DC / DC converter circuit, a high-frequency DC / DC converter module for railway vehicles, and a railway vehicle that can achieve power balance between multiple high-frequency transformers at low cost.

[0009] To this end, one scheme of the utility model provides a high-frequency DC / DC conversion circuit, which is used to convert the power from the upstream and then output it to the downstream, and comprises: an inverter circuit part, including an inverter circuit, which inverts the direct current from the upstream into alternating current; a transformer circuit part, including multiple high-frequency transformers, which transforms the alternating current from the inverter circuit part; and a rectifier circuit part, including a rectifier circuit, which rectifies the alternating current from the multiple high-frequency transformers of the transformer circuit part into direct current and outputs it in a superimposed manner downstream; the primary windings of the multiple high-frequency transformers are connected in series with the inverter circuit of the inverter circuit part via a resonant inductor, and the secondary windings of the multiple high-frequency transformers are connected in parallel with the rectifier circuit of the rectifier circuit part.

[0010] According to the technical solution, since the primary windings of multiple high-frequency transformers are connected in series with each other via the resonant inductor and the inverter circuit of the inverter circuit unit, the current flowing in the primary windings of each high-frequency transformer can be made the same at all times. Therefore, when the output power on the secondary side of any high-frequency transformer increases, the current on the primary side of the high-frequency transformer will increase, and through the series relationship of the primary windings, the current of the primary windings of other high-frequency transformers will also increase, thereby increasing the output power of other high-frequency transformers. In this way, the power balance of multiple high-frequency transformers can be automatically achieved without the need for special voltage and current balancing control.

[0011] Moreover, by connecting the primary windings of multiple high-frequency transformers in series, only one inverter circuit can be set in the inverter circuit part. There is no need to set up multiple inverter circuits as in the past, which can save the purchase cost of components of the inverter circuit part and the subsequent maintenance cost.

[0012] This makes it possible to realize automatic balancing of the powers of a plurality of high-frequency transformers at low cost.

[0013] In addition, another scheme of the utility model provides a high-frequency DC / DC conversion circuit, which is used to convert the electric power from the upstream and output it to the downstream, and comprises: an inverter circuit part, including an inverter circuit, which inverts the direct current from the upstream into alternating current; a transformer circuit part, including multiple high-frequency transformers, which transforms the alternating current from the inverter circuit part; and a rectifier circuit part, including a rectifier circuit, which rectifies the alternating current from the multiple high-frequency transformers of the transformer circuit part into direct current and outputs it in a superimposed manner to the downstream; the primary windings of the multiple high-frequency transformers are connected to the inverter circuit of the inverter circuit part in parallel with each other via resonant inductors, and the secondary windings of the multiple high-frequency transformers are connected to the rectifier circuit of the rectifier circuit part in series with each other.

[0014] According to the technical solution, since the secondary windings of multiple high-frequency transformers are connected in series with the rectifier circuit of the rectifier circuit unit, the current flowing in the secondary windings of each high-frequency transformer can be made the same. Therefore, when the input power of the primary side of any high-frequency transformer increases, the current of the secondary side of the high-frequency transformer will increase, and through the series relationship of the secondary windings, the current of the secondary windings of other high-frequency transformers will also increase, thereby increasing the output power of other high-frequency transformers. In this way, the power balance of multiple high-frequency transformers can be automatically achieved without the need for special voltage and current balancing control.

[0015] Moreover, by connecting the secondary windings of multiple high-frequency transformers in series, only one rectifier circuit can be set in the rectifier circuit part. There is no need to set up multiple rectifier circuits as in the past, which can save the purchase cost of components of the rectifier circuit part and the subsequent maintenance cost.

[0016] This makes it possible to realize automatic balancing of the powers of a plurality of high-frequency transformers at low cost.

[0017] In addition, preferably, the inverter circuit is a half-bridge inverter circuit.

[0018] According to this technical solution, compared with an inverter circuit with a full-bridge structure, the number of switching tubes (MOSFET, IGBT, etc.) can be reduced, thus helping to reduce costs.

[0019] In addition, preferably, two high-frequency transformers are provided.

[0020] According to this technical solution, it is possible to realize automatic balancing of the power of a plurality of high-frequency transformers at low cost while taking into account the miniaturization of the high-frequency DC / DC converter circuit.

[0021] In addition, another scheme of the utility model provides a high-frequency DC / DC conversion module for railway vehicles, which is used to convert the power from the upstream and output it to the downstream in the auxiliary power supply system, and comprises: an inverter unit, including an inverter circuit, which inverts the direct current from the upstream into alternating current; a transformer unit, including multiple high-frequency transformers, which transforms the alternating current from the inverter unit; and a rectifier unit, including a rectifier circuit, which rectifies the alternating current from the multiple high-frequency transformers of the transformer unit into direct current and outputs it in a superimposed manner downstream; the primary windings of the multiple high-frequency transformers are connected to the inverter circuit of the inverter unit in a series manner via a resonant inductor, and the secondary windings of the multiple high-frequency transformers are connected to the rectifier circuit of the rectifier unit in a parallel manner.

[0022] According to the technical solution, since the primary windings of multiple high-frequency transformers are connected in series with each other via the resonant inductor and the inverter circuit of the inverter unit, the current flowing in the primary windings of each high-frequency transformer can be made the same. Therefore, when the output power of the secondary side of any high-frequency transformer increases, the current on the primary side of the high-frequency transformer will increase, and through the series relationship of the primary windings, the current of the primary windings of other high-frequency transformers will also increase, thereby increasing the output power of other high-frequency transformers. In this way, the power balance of multiple high-frequency transformers can be automatically achieved without the need for special voltage and current balancing control.

[0023] Moreover, by connecting the primary windings of multiple high-frequency transformers in series, only one inverter circuit can be set in the inverter unit, and there is no need to set up multiple inverter circuits as in the past, which can save the purchase cost of components of the inverter unit and subsequent maintenance costs.

[0024] This makes it possible to realize automatic balancing of the powers of a plurality of high-frequency transformers at low cost.

[0025] In addition, another scheme of the utility model provides a high-frequency DC / DC conversion module for railway vehicles, which is used to convert the power from the upstream and output it to the downstream in the auxiliary power supply system, and comprises: an inverter unit, including an inverter circuit, which inverts the direct current from the upstream into alternating current; a transformer unit, including multiple high-frequency transformers, which transforms the alternating current from the inverter unit; and a rectifier unit, including a rectifier circuit, which rectifies the alternating current from the multiple high-frequency transformers of the transformer unit into direct current and outputs it in a superimposed manner downstream; the primary windings of the multiple high-frequency transformers are connected to the inverter circuit of the inverter unit in parallel with each other via resonant inductors, and the secondary windings of the multiple high-frequency transformers are connected to the rectifier circuit of the rectifier unit in series with each other.

[0026] According to the technical solution, since the secondary windings of multiple high-frequency transformers are connected in series with the rectifier circuit of the rectifier unit, the current flowing in the secondary windings of each high-frequency transformer can be made the same. Therefore, when the input power of the primary side of any high-frequency transformer increases, the current of the secondary side of the high-frequency transformer will increase, and through the series relationship of the secondary windings, the current of the secondary windings of other high-frequency transformers will also increase, thereby increasing the output power of other high-frequency transformers. In this way, the power balance of multiple high-frequency transformers can be automatically achieved without the need for special voltage and current balancing control.

[0027] Moreover, by connecting the secondary windings of multiple high-frequency transformers in series, only one rectifier circuit can be set in the rectifier unit, and there is no need to set up multiple rectifier circuits as in the past, which can save the purchase cost of components and subsequent maintenance costs of the rectifier unit.

[0028] This makes it possible to realize automatic balancing of the powers of a plurality of high-frequency transformers at low cost.

[0029] In addition, preferably, the inverter circuit is a half-bridge inverter circuit.

[0030] According to this technical solution, compared with an inverter circuit with a full-bridge structure, the number of switching tubes (MOSFET, IGBT, etc.) can be reduced, thus helping to reduce costs.

[0031] In addition, preferably, the resonant inductor is a leakage inductance respectively integrated in the winding of each high-frequency transformer, and the leakage inductances integrated in the winding of each high-frequency transformer are the same.

[0032] According to this technical solution, by integrating the resonant inductor as a leakage inductor into the winding of the high-frequency transformer, compared with the case where the resonant inductor is formed using an external wire, a compact design of the high-frequency transformer itself and thus the entire high-frequency DC / DC converter module can be achieved.

[0033] In addition, preferably, two high-frequency transformers are provided.

[0034] According to this technical solution, it is possible to realize automatic balancing of the power of a plurality of high-frequency transformers at low cost while taking into account the miniaturization of the high-frequency DC / DC converter module.

[0035] In addition, the utility model also provides a railway vehicle, which comprises: a converter cabinet; and a high-frequency DC / DC converter module for railway vehicles in any of the above schemes, which is accommodated in the converter cabinet and converts the power from the upstream and outputs it to the downstream load.

[0036] According to this technical solution, the same technical effect as the high-frequency DC / DC converter module for railway vehicles in any of the above solutions can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram showing a high-frequency DC / DC converter circuit in the first embodiment.

[0038] Figure 2 This is a schematic diagram showing an example of currents flowing through primary windings of a plurality of high-frequency transformers included in the high-frequency DC / DC converter circuit in the first embodiment.

[0039] Figure 3 It is a schematic diagram showing a high-frequency DC / DC converter circuit in the second embodiment.

[0040] Figure 4 This is a schematic diagram showing an example of currents flowing through secondary windings of a plurality of high-frequency transformers included in the high-frequency DC / DC converter circuit in the second embodiment.

[0041] Figure 5 It is a schematic diagram showing the overall structure of a high-frequency DC / DC converter module for railway vehicles in the third embodiment and the fourth embodiment.

[0042] Figure 6 This is a schematic diagram showing a high-frequency DC / DC converter circuit in a modified form.

[0043] Figure 7 This is a schematic diagram showing a high-frequency DC / DC converter circuit in a modified form.

[0044] Figure 8 It is a schematic diagram showing a high-frequency DC / DC converter circuit in the prior art. DETAILED DESCRIPTION

[0045] The following embodiments of the present invention are described. Note that the following embodiments are listed to facilitate understanding of the present invention and are not intended to limit the present invention.

[0046] In addition, in this specification, ordinal expressions such as "first", "second", and "third" are sometimes used, but these ordinal expressions are only for distinguishing different things and do not represent a fixed order of appearance of things or their superiority or inferiority.

[0047] In addition, the term “connected” means electrically connected unless otherwise specified.

[0048] <1> First embodiment

[0049] [1-1] Overall structure

[0050] Hereinafter, the overall configuration of a high-frequency DC / DC converter circuit in a first embodiment will be described with reference to the drawings.

[0051] The high-frequency DC / DC converter circuit in the first embodiment is used to convert the electric power (direct current) from the upstream and output it to the downstream (for example, an electric load).

[0052] Figure 1 It is a schematic diagram showing a high-frequency DC / DC converter circuit in the first embodiment.

[0053] like Figure 1 As shown, the high-frequency DC / DC converter circuit in the first embodiment mainly includes an inverter circuit portion InC, a transformer circuit portion TrC, and a rectifier circuit portion ReC.

[0054] The inverter circuit unit InC is used to invert direct current power input from an upstream direct current source via the positive input terminal Pi and the negative input terminal Ni into alternating current power.

[0055] Specifically, the inverter circuit unit InC has a half-bridge inverter circuit including a first bridge arm provided with a support capacitor FC1, a second bridge arm provided with two resonant capacitors RC1 and RC2, and a third bridge arm provided with two semiconductor switch modules SW1 and SW2.

[0056] The support capacitor FC1 can eliminate the ripple in the input DC and stabilize the DC input voltage.

[0057] The resonant capacitors RC1 and RC2 constitute an LLC resonant circuit together with the magnetizing inductance Lm1 and the resonant inductance Lr1 of the high-frequency transformer Tr1 and the magnetizing inductance Lm2 and the resonant inductance Lr2 of the high-frequency transformer Tr2 included in the transformer circuit portion TrC described later.

[0058] The two semiconductor switch modules SW1 and SW2 operate at a predetermined switching frequency and duty ratio under the control of a control circuit (not shown) to maintain the stability of the output voltage.

[0059] The semiconductor switch module SW1 can be composed of a metal oxide semiconductor field effect transistor (MOSFET) and a diode connected in parallel with each other, wherein the drain of the metal oxide semiconductor field effect transistor is connected to the cathode of the diode, and the source of the metal oxide semiconductor field effect transistor is connected to the anode of the diode. The metal oxide semiconductor field effect transistor is used to realize the switching function, and the diode is used to prevent the metal oxide semiconductor field effect transistor from reverse breakdown.

[0060] In addition, the drain of the metal oxide semiconductor field effect transistor constituting the semiconductor switch module SW1 and the cathode of the diode constituting the semiconductor switch module SW1 are commonly connected to the positive input terminal Pi, and the source of the metal oxide semiconductor field effect transistor constituting the semiconductor switch module SW1 and the anode of the diode constituting the semiconductor switch module SW1 are commonly connected to the drain of the metal oxide semiconductor field effect transistor constituting the semiconductor switch module SW2 described later and the cathode of the diode constituting the semiconductor switch module SW2.

[0061] In addition, as the metal oxide semiconductor field effect transistor constituting the semiconductor switch module SW1, a silicon carbide field effect transistor (SiC-MOSFET) can be used. In this way, it is easier to achieve soft switching under high frequency conditions, which is beneficial to the reduction of the core volume and the number of turns of the winding coil of the high-frequency transformer Tr1 and Tr2 of the transformer circuit part TrC described later, and realizes the lightweight and miniaturization of the transformer.

[0062] Similarly, the semiconductor switch module SW2 can be composed of a metal oxide semiconductor field effect transistor and a diode connected in parallel with each other, wherein the drain of the metal oxide semiconductor field effect transistor is connected to the cathode of the diode, and the source of the metal oxide semiconductor field effect transistor is connected to the anode of the diode. The metal oxide semiconductor field effect transistor is used to realize the switching function, and the diode is used to prevent the metal oxide semiconductor field effect transistor from reverse breakdown.

[0063] In addition, the source of the MOSFET and the anode of the diode in the semiconductor switch module SW2 are commonly connected to the negative input terminal Ni.

[0064] In addition, as the metal oxide semiconductor field effect transistor constituting the semiconductor switch module SW2, a silicon carbide field effect transistor can also be used. In this way, it is easier to achieve soft switching under high frequency conditions, which is beneficial to reducing the core volume and the number of turns of the winding coil of the high-frequency transformer Tr1 and Tr2 of the transformer circuit part TrC described later, and realizing the lightweight and miniaturization of the transformer.

[0065] The transformer circuit section TrC forms an LLC resonant circuit with the inverter circuit section InC and transforms the AC power from the inverter circuit section InC. The transformer circuit section TrC also serves to isolate the high voltage upstream side from the low voltage downstream side.

[0066] The transformer circuit section TrC includes two high-frequency transformers Tr1 and Tr2.

[0067] One terminal of the primary winding of the high-frequency transformer Tr1 is connected to the midpoint of the two semiconductor switch modules SW1 and SW2 on the third bridge arm of the inverter circuit part InC via the resonant inductor Lr1, and the other terminal of the primary winding of the high-frequency transformer Tr1 is connected to one terminal of the primary winding of the high-frequency transformer Tr2 via the resonant inductor Lr2. The other terminal of the primary winding of the high-frequency transformer Tr2 is connected to the midpoint of the two resonant capacitors RC1 and RC2 on the second bridge arm of the inverter circuit part InC.

[0068] In other words, the primary winding of the high-frequency transformer Tr1 and the primary winding of the high-frequency transformer Tr2 are connected in series, and the primary windings of the two high-frequency transformers Tr1 and Tr2 are connected to the half-bridge inverter circuit of the inverter circuit part InC via the resonant inductors Lr1 and Lr2.

[0069] In addition, Figure 1 In the figure, reference symbol “ Lm1 ” represents the magnetizing inductance of the high-frequency transformer Tr1 , and reference symbol “ Lm2 ” represents the magnetizing inductance of the high-frequency transformer Tr2 .

[0070] In addition, the secondary winding of the high-frequency transformer Tr1 and the secondary winding of the high-frequency transformer Tr2 are provided in parallel with each other, which will be described later.

[0071] The rectifying circuit section ReC is used to rectify the alternating current from the two high-frequency transformers Tr1 and Tr2 of the transformation circuit section TrC into direct current and to output the direct current in a superimposed manner downstream.

[0072] The rectifying circuit unit ReC includes a rectifying circuit, and the rectification described above is realized by the rectifying circuit.

[0073] like Figure 1 As shown, the rectifier circuit includes a fourth bridge arm provided with two diode switches RD1 and RD3 and a fifth bridge arm provided with two diode switches RD2 and RD4, forming a full-bridge rectifier circuit. In the fourth bridge arm, the cathode of the diode switch RD1 is connected to the positive output terminal Po, the anode of the diode switch RD1 is connected to the cathode of the diode switch RD3, and the anode of the diode switch RD3 is connected to the negative output terminal No. In the fifth bridge arm, the cathode of the diode switch RD2 is connected to the positive output terminal Po, the anode of the diode switch RD2 is connected to the cathode of the diode switch RD4, and the anode of the diode switch RD4 is connected to the negative output terminal No.

[0074] In addition, in the rectifier circuit, a fast recovery diode can be used as a diode switch.

[0075] In addition, the rectifier circuit further includes a sixth bridge arm provided with a filter capacitor FC2.

[0076] One connector of the secondary winding of the high-frequency transformer Tr1 in the transformer circuit part TrC is connected to the midpoint of the two diode switches RD1 and RD3 on the fourth bridge arm of the rectifier circuit in the rectifier circuit part ReC, and the other connector of the secondary winding of the high-frequency transformer Tr1 is connected to the midpoint of the two diode switches RD2 and RD4 on the fifth bridge arm of the rectifier circuit.

[0077] Similarly, one terminal of the secondary winding of the high-frequency transformer Tr2 in the transformer circuit part TrC is connected to the midpoint of the two diode switches RD1 and RD3 on the fourth bridge arm of the rectifier circuit of the rectifier circuit part ReC, and the other terminal of the secondary winding of the high-frequency transformer Tr2 is connected to the midpoint of the two diode switches RD2 and RD4 on the fifth bridge arm of the rectifier circuit.

[0078] In this way, the secondary windings of the high-frequency transformers Tr1 and Tr2 in the transformer circuit portion TrC are connected in parallel to the rectifier circuits in the rectifier circuit portion ReC.

[0079] Thus, the rectifying circuit unit ReC rectifies the alternating current from the two high-frequency transformers Tr1 and Tr2 into direct current using the rectifying circuit, and outputs the DC power in a superimposed manner to the downstream.

[0080] In addition, the positive input terminal Pi and the negative input terminal Ni are used to connect to an upstream DC source, and the positive output terminal Po and the negative output terminal No can be connected to a downstream electrical load.

[0081] In this manner, the high-frequency DC / DC converter circuit in this embodiment is configured.

[0082] [1-2]Working process

[0083] The working process of the above high-frequency DC / DC converter circuit is:

[0084] The DC power from the upstream is input from the positive input terminal Pi and the negative input terminal Ni, and is inverted into AC power by the half-bridge inverter circuit of the inverter circuit part InC.

[0085] Then, the AC power obtained by the inverter circuit part InC is transformed into AC power of the required voltage by the two high-frequency transformers Tr1 and Tr2 of the transformer circuit part TrC;

[0086] Finally, the alternating current transformed by the transformer circuit unit TrC is input from the two high-frequency transformers Tr1 and Tr2 to the rectifier circuit of the rectifier circuit unit ReC, rectified into direct current and output from the positive output terminal Po and the negative output terminal No in a superimposed manner.

[0087] [1-3] Technical Effects

[0088] The main technical effects of the high-frequency DC / DC converter circuit are described below.

[0089] According to the high-frequency DC / DC converter circuit, the primary windings of the plurality of high-frequency transformers Tr1 and Tr2 of the transformer circuit portion TrC are connected in series with the inverter circuit of the inverter circuit portion InC via the resonant inductors Lr1 and Lr2. Figure 2 As shown, the currents i1 and i2 flowing in the primary windings of the high-frequency transformers Tr1 and Tr2 can be made the same at all times. Therefore, when the output power of the secondary side of any high-frequency transformer increases, the current on the primary side of the high-frequency transformer will increase, and through the series connection of the primary windings, the currents of the primary windings of other high-frequency transformers will also increase, thereby increasing the output power of other high-frequency transformers. In this way, the power balance of multiple high-frequency transformers can be automatically achieved without the need for special voltage and current balancing control.

[0090] Moreover, by connecting the primary windings of multiple high-frequency transformers Tr1 and Tr2 in series, only one inverter circuit can be set in the inverter circuit part InC. There is no need to set up multiple inverter circuits as in the past, which can save the purchase cost of components of the inverter circuit part and the subsequent maintenance cost.

[0091] This makes it possible to realize automatic balancing of the power of the plurality of high-frequency transformers Tr1 and Tr2 at low cost.

[0092] <2> Second embodiment

[0093] [2-1] Overall structure

[0094] Hereinafter, the overall configuration of a high-frequency DC / DC converter circuit in a second embodiment will be described with reference to the drawings.

[0095] The high-frequency DC / DC converter circuit in the second embodiment is different from the high-frequency DC / DC converter circuit in the first embodiment in terms of the connection between the transformer circuit portion TrC, the inverter circuit portion InC, and the rectifier circuit portion ReC. Therefore, the following description will focus on this part.

[0096] Since the other parts of the high-frequency DC / DC converter circuit in the second embodiment are the same as those in the first embodiment, the description thereof will be omitted.

[0097] Figure 3 It is a schematic diagram showing a high-frequency DC / DC converter circuit in the second embodiment.

[0098] like Figure 3As shown, one connection of the primary winding of the high-frequency transformer Tr1 of the transformer circuit part TrC is connected to the midpoint of the two semiconductor switch modules SW1 and SW2 on the third bridge arm of the inverter circuit part InC via the resonant inductor Lr1, and the other connection of the primary winding of the high-frequency transformer Tr1 is connected to the midpoint of the two resonant capacitors RC1 and RC2 on the second bridge arm of the inverter circuit part InC.

[0099] Similarly, one connection of the primary winding of the high-frequency transformer Tr2 of the transformer circuit part TrC is connected to the midpoint of the two semiconductor switch modules SW1 and SW2 on the third bridge arm of the inverter circuit part InC via the resonant inductor Lr2, and the other connection of the primary winding of the high-frequency transformer Tr2 is connected to the midpoint of the two resonant capacitors RC1 and RC2 on the second bridge arm of the inverter circuit part InC.

[0100] That is, the primary windings of the high-frequency transformers Tr1 and Tr2 of the transformer circuit portion TrC are connected in parallel to the inverter circuit of the inverter circuit portion InC via the resonant inductors Lr1 and Lr2 , respectively.

[0101] like Figure 3 As shown, one connection of the secondary winding of the high-frequency transformer Tr1 of the transformer circuit part TrC is connected to the midpoint of the two diode switches RD1 and RD3 on the fourth bridge arm of the rectifier circuit of the rectifier circuit part ReC, another connection of the secondary winding of the high-frequency transformer Tr1 is connected to one connection of the secondary winding of the high-frequency transformer Tr2, and another connection of the secondary winding of the high-frequency transformer Tr2 is connected to the midpoint of the two diode switches RD2 and RD4 on the fifth bridge arm of the rectifier circuit.

[0102] That is, the secondary windings of the high-frequency transformers Tr1 and Tr2 in the transformer circuit portion TrC are connected in series with the rectifier circuit in the rectifier circuit portion ReC.

[0103] In this manner, the high-frequency DC / DC converter circuit in this embodiment is configured.

[0104] [2-2]Working process

[0105] The working process of the above high-frequency DC / DC converter circuit is:

[0106] The DC power from the upstream is input from the positive input terminal Pi and the negative input terminal Ni, and is inverted into AC power by the half-bridge inverter circuit of the inverter circuit part InC.

[0107] Then, the AC power obtained by the inverter circuit part InC is transformed into AC power of the required voltage by the two high-frequency transformers Tr1 and Tr2 of the transformer circuit part TrC.

[0108] Finally, the AC power transformed by the transformer circuit unit TrC is input from the two high-frequency transformers Tr1 and Tr2 to the rectifier circuit of the rectifier circuit unit ReC, rectified into DC power and output from the positive output terminal Po and the negative output terminal No.

[0109] [2-3] Technical Effects

[0110] The main technical effects of the high-frequency DC / DC converter circuit are described below.

[0111] According to the high-frequency DC / DC converter circuit, since the secondary windings of the plurality of high-frequency transformers Tr1 and Tr2 of the transformer circuit portion TrC are connected in series with the rectifier circuit of the rectifier circuit portion ReC, Figure 4 As shown, the currents i3 and i4 flowing in the secondary windings of each high-frequency transformer Tr1 and Tr2 can be made the same at all times. Therefore, when the input power on the primary side of any high-frequency transformer increases, the current on the secondary side of the high-frequency transformer will increase, and through the series connection of the secondary windings, the currents on the secondary windings of other high-frequency transformers will also increase, thereby increasing the output power of other high-frequency transformers. In this way, the power balance of multiple high-frequency transformers can be automatically achieved without the need for special voltage and current balancing control.

[0112] Moreover, by connecting the secondary windings of multiple high-frequency transformers Tr1 and Tr2 in series, only one rectifier circuit can be set in the rectifier circuit part ReC. There is no need to set up multiple rectifier circuits as in the past, which can save the purchase cost of components of the rectifier circuit part and the subsequent maintenance cost.

[0113] This makes it possible to realize automatic balancing of the power of the plurality of high-frequency transformers Tr1 and Tr2 at low cost.

[0114] <3> Third embodiment

[0115] [3-1] Overall structure

[0116] Hereinafter, the overall structure of a high-frequency DC / DC converter module for railway vehicles according to a third embodiment will be described with reference to the drawings.

[0117] The high-frequency DC / DC converter module for railway vehicles in the third embodiment is used in the auxiliary power supply system of the railway vehicle, and is used to convert the power supplied from the upstream power supply network into power that can be used by downstream electrical loads (such as lighting, air conditioning, refrigerators and other on-board electrical equipment), and output the converted power to these electrical loads.

[0118] Figure 5 The overall structure of a high-frequency DC / DC converter module for railway vehicles in the third embodiment is shown.

[0119] like Figure 5 As shown, the high-frequency DC / DC converter module for railway vehicles in this embodiment mainly includes an inverter unit InU, a transformer unit TrU and a rectifier unit ReU.

[0120] The inverter unit InU corresponds to the inverter circuit part InC of the high-frequency DC / DC converter circuit in the first embodiment, and is used to invert the DC power input from the upstream DC source via the positive input terminal Pi and the negative input terminal Ni into AC power.

[0121] Since the inverter unit InU has the same circuit structure as the inverter circuit portion InC in the first embodiment, the circuit structure of the inverter unit InU will not be described here.

[0122] The transformer unit TrU corresponds to the transformer circuit part TrC of the high-frequency DC / DC conversion circuit in the first embodiment. On the one hand, it forms an LLC resonant circuit with the inverter unit InU, and on the other hand, it is used to transform the alternating current from the inverter unit InU. In addition, the transformer unit TrU also serves to isolate the upstream side of the high voltage from the downstream side of the low voltage.

[0123] The transformation unit TrU has substantially the same circuit configuration as that of the transformation circuit portion TrC in the first embodiment.

[0124] The transformer unit TrU is different from the transformer circuit part TrC in the first embodiment in that: in the transformer unit TrU, the resonant inductor Lr1 is a leakage inductance integrated in the winding of the high-frequency transformer Tr1, the resonant inductor Lr2 is also a leakage inductance integrated in the winding of the high-frequency transformer Tr2, and the leakage inductance value of the leakage inductance integrated in the winding of the high-frequency transformer Tr1 (resonant inductor Lr1) and the leakage inductance value of the leakage inductance integrated in the winding of the high-frequency transformer Tr2 (resonant inductor Lr2) are the same as each other.

[0125] Since the other structures of the transformation unit TrU are the same as those of the transformation circuit portion TrC in the first embodiment, the description thereof is omitted here.

[0126] The rectifier unit ReU corresponds to the rectifier circuit portion ReC of the high-frequency DC / DC converter circuit in the first embodiment, and is used to rectify the AC power from the two high-frequency transformers of the transformation unit TrU into DC power and output the DC power in a superimposed manner downstream.

[0127] Since the rectifying unit ReU has the same circuit structure as the rectifying circuit portion ReC in the first embodiment, the circuit structure of the rectifying unit ReU will not be described here.

[0128] In addition, in terms of mechanical structure, the inverter unit InU and the rectifier unit ReU can be arranged together to form an integral inverter rectifier unit. The inverter rectifier unit can be installed on a liquid cooling plate using a liquid cooling medium (such as water), so that the liquid cooling plate is used to cool the components constituting the inverter unit InU and the components constituting the rectifier unit ReU. In addition, the transformer unit TrU can also use liquid cooling, that is, its two high-frequency transformers are installed on a liquid cooling plate, so that the liquid cooling plate is used to cool the two high-frequency transformers. Moreover, the inverter unit InU and the rectifier unit ReU in the inverter rectifier unit and the two high-frequency transformers in the transformer unit TrU can be installed together in a terminal direct connection manner, rather than being connected using wires.

[0129] In addition, the positive input terminal Pi and the negative input terminal Ni are used to connect to an upstream DC source, and the positive output terminal Po and the negative output terminal No can be connected to a downstream electrical load.

[0130] In this manner, the high-frequency DC / DC converter module for railway vehicles in the present embodiment is constructed.

[0131] [3-2]Working process

[0132] The working process of the above-mentioned high-frequency DC / DC converter module for railway vehicles is:

[0133] The DC power from the upstream is input from the positive input terminal Pi and the negative input terminal Ni, and is inverted into AC power through the half-bridge inverter circuit of the inverter unit InU;

[0134] Then, the AC power obtained by the inversion unit InU is transformed into AC power of the required voltage by the two high-frequency transformers Tr1 and Tr2 of the transformer unit TrU;

[0135] Finally, the alternating current transformed by the transformer unit TrU is input to the rectifier circuit of the rectifier unit ReU from the two high-frequency transformers Tr1 and Tr2, rectified into direct current and output from the positive output terminal Po and the negative output terminal No in a superimposed manner.

[0136] [3-3] Technical Effects

[0137] According to the high-frequency DC / DC converter module for railway vehicles in this embodiment, it is possible to achieve the same technical effects as the high-frequency DC / DC converter circuit in the first embodiment.

[0138] Furthermore, by integrating the resonant inductor as a leakage inductor into the winding of the high-frequency transformer, the high-frequency transformer itself and the entire high-frequency DC / DC converter module can be more compactly designed, compared to, for example, using external wires to form the resonant inductor.

[0139] <4> Fourth embodiment

[0140] [4-1] Overall structure

[0141] Hereinafter, the overall structure of a high-frequency DC / DC converter module for railway vehicles according to a fourth embodiment will be described with reference to the drawings.

[0142] The high-frequency DC / DC converter module for railway vehicles in the fourth embodiment is used in the auxiliary power supply system of the railway vehicle, and is used to convert the power supplied from the upstream power supply network into power that can be used by downstream electrical loads (such as lighting, air conditioning, refrigerators and other on-board electrical equipment), and output the converted power to these electrical loads.

[0143] Figure 5 The overall structure of a high-frequency DC / DC converter module for railway vehicles in a fourth embodiment is shown.

[0144] like Figure 5 As shown, the high-frequency DC / DC converter module for railway vehicles in this embodiment mainly includes an inverter unit InU, a transformer unit TrU and a rectifier unit ReU.

[0145] The inverter unit InU corresponds to the inverter circuit part InC of the high-frequency DC / DC converter circuit in the second embodiment, and is used to invert the DC power input from the upstream DC source via the positive input terminal Pi and the negative input terminal Ni into AC power.

[0146] Since the inverter unit InU has the same circuit structure as the inverter circuit portion InC in the second embodiment, the circuit structure of the inverter unit InU will not be described here.

[0147] The transformer unit TrU corresponds to the transformer circuit part TrC of the high-frequency DC / DC conversion circuit in the second embodiment. On the one hand, it forms an LLC resonant circuit with the inverter unit InU, and on the other hand, it is used to transform the alternating current from the inverter unit InU. In addition, the transformer unit TrU also serves to isolate the upstream side of the high voltage from the downstream side of the low voltage.

[0148] The transformer unit TrU has substantially the same circuit configuration as that of the transformer circuit portion TrC in the second embodiment.

[0149] The transformer unit TrU is different from the transformer circuit part TrC in the second embodiment in that: in the transformer unit TrU, the resonant inductor Lr1 is a leakage inductance integrated in the winding of the high-frequency transformer Tr1, the resonant inductor Lr2 is also a leakage inductance integrated in the winding of the high-frequency transformer Tr2, and the leakage inductance value of the leakage inductance integrated in the winding of the high-frequency transformer Tr1 (resonant inductor Lr1) and the leakage inductance value of the leakage inductance integrated in the winding of the high-frequency transformer Tr2 (resonant inductor Lr2) are the same as each other.

[0150] Since the other structures of the transformation unit TrU are the same as those of the transformation circuit portion TrC in the second embodiment, the description thereof is omitted here.

[0151] The rectifier unit ReU corresponds to the rectifier circuit portion ReC of the high-frequency DC / DC converter circuit in the second embodiment, and is used to rectify the AC power from the two high-frequency transformers of the transformation unit TrU into DC power and output the DC power in a superimposed manner downstream.

[0152] Since the rectifying unit ReU has the same circuit structure as the rectifying circuit portion ReC in the second embodiment, the circuit structure of the rectifying unit ReU will not be described here.

[0153] In addition, in terms of mechanical structure, the inverter unit InU and the rectifier unit ReU can be arranged together to form an integral inverter rectifier unit. The inverter rectifier unit can be installed on a liquid cooling plate using a liquid cooling medium (such as water), so that the liquid cooling plate is used to cool the components constituting the inverter unit InU and the components constituting the rectifier unit ReU. In addition, the transformer unit TrU can also use liquid cooling, that is, its two high-frequency transformers are installed on a liquid cooling plate, so that the liquid cooling plate is used to cool the two high-frequency transformers. Moreover, the inverter unit InU and the rectifier unit ReU in the inverter rectifier unit and the two high-frequency transformers in the transformer unit TrU can be installed together in a terminal direct connection manner, rather than being connected using wires.

[0154] In addition, the positive input terminal Pi and the negative input terminal Ni are used to connect to an upstream DC source, and the positive output terminal Po and the negative output terminal No can be connected to a downstream electrical load.

[0155] In this manner, the high-frequency DC / DC converter module for railway vehicles in the present embodiment is constructed.

[0156] [4-2]Working process

[0157] The working process of the above-mentioned high-frequency DC / DC converter module for railway vehicles is:

[0158] The DC power from the upstream is input from the positive input terminal Pi and the negative input terminal Ni, and is inverted into AC power through the half-bridge inverter circuit of the inverter unit InU;

[0159] Then, the AC power obtained by the inversion unit InU is transformed into AC power of the required voltage by the two high-frequency transformers Tr1 and Tr2 of the transformer unit TrU;

[0160] Finally, the alternating current transformed by the transformer unit TrU is inputted into the rectifier circuit of the rectifier unit ReU from the two high-frequency transformers Tr1 and Tr2, rectified into direct current and outputted from the positive output terminal Po and the negative output terminal No.

[0161] [4-3] Technical Effects

[0162] According to the high-frequency DC / DC converter module for railway vehicles in this embodiment, it is possible to achieve the same technical effects as the high-frequency DC / DC converter circuit in the second embodiment.

[0163] Furthermore, by integrating the resonant inductor as a leakage inductor into the winding of the high-frequency transformer, the high-frequency transformer itself and the entire high-frequency DC / DC converter module can be more compactly designed, compared to, for example, using external wires to form the resonant inductor.

[0164] <5> Fifth embodiment

[0165] [5-1] Overall structure

[0166] A fifth embodiment of the present invention provides a railway vehicle, which is a railway vehicle such as an electric locomotive that operates using electric power from a power supply network.

[0167] The railway vehicle of this embodiment includes an auxiliary converter cabinet (converter cabinet), which has a plurality of cabinet spaces. A high-frequency DC / DC converter module for railway vehicles of the third or fourth embodiment is installed inside at least one of the plurality of cabinet spaces. The high-frequency DC / DC converter module converts the electric power from the upstream and outputs it to the downstream load.

[0168] [5-2] Technical Effects

[0169] According to the railway vehicle of the present embodiment, it is possible to achieve the same technical effects as those of the high-frequency DC / DC converter module for railway vehicles of the third or fourth embodiment.

[0170] In addition, since the high-frequency DC / DC converter module for railway vehicles only occupies one cabinet space of the auxiliary converter cabinet, the cabinet space can be saved for other expansion equipment.

[0171] <6> other

[0172] The above describes the various embodiments of the present invention, but these embodiments are proposed for easy understanding of the present invention, and the protection scope of the present invention is not limited to these embodiments. Those skilled in the art can make various modifications to these embodiments without departing from the technical idea of ​​the present invention. Below, these modifications are illustrated.

[0173] (1) In the first embodiment, the half-bridge inverter circuit of the inverter circuit portion InC is a symmetrical half-bridge, but the present invention is not limited thereto and an asymmetrical half-bridge may be used.

[0174] Figure 6 1 is a schematic diagram showing a high-frequency DC / DC converter circuit in this modification.

[0175] like Figure 6 As shown, the inverter circuit part InC2 has an asymmetric half-bridge inverter circuit, which includes a first bridge arm provided with a supporting capacitor FC1, a third bridge arm provided with two semiconductor switch modules SW1 and SW2, and a resonant capacitor RC3 whose one end is connected to the source of the metal oxide semiconductor field effect transistor of the semiconductor switch module SW2 and the anode of the diode.

[0176] One connection of the primary winding of the high-frequency transformer Tr1 is connected to the midpoint of the two semiconductor switch modules SW1 and SW2 on the third bridge arm of the inverter circuit part InC2 via the resonant inductor Lr1, and another connection of the primary winding of the high-frequency transformer Tr1 is connected to one connection of the primary winding of the high-frequency transformer Tr2 via the resonant inductor Lr2, and another connection of the primary winding of the high-frequency transformer Tr2 is connected to the other end of the resonant capacitor RC3 of the inverter circuit part InC2.

[0177] The other structures are the same as those of the first embodiment.

[0178] According to this modified embodiment, it is possible to achieve substantially the same technical effects as those of the first embodiment.

[0179] Furthermore, a high-frequency DC / DC converter module for railway vehicles may also use the circuit structure of the high-frequency DC / DC converter circuit in this modified form, and a railway vehicle may also use the high-frequency DC / DC converter module for railway vehicles that has undergone the above modification.

[0180] (2) In the first and second embodiments, the inverter circuit portion InC uses a half-bridge inverter circuit, but the present invention is not limited thereto and a full-bridge inverter circuit may be used.

[0181] (3) In each embodiment / variant, in the schematic diagram, N-channel field effect transistors are used as switch tubes of the semiconductor switch modules SW1 and SW2 in the inverter circuit unit InC / InC2, but this is not limited to this, and P-channel field effect transistors may also be used.

[0182] (4) In the above-mentioned embodiments / variations, the switching tubes of the semiconductor switch modules SW1 and SW2 constituting the inverter circuit unit InC / InC2 are not limited to metal oxide semiconductor field effect transistors, and insulated gate bipolar transistors (IGBTs) may also be used.

[0183] (5) In the above embodiment, two high-frequency transformers are provided, but the present invention is not limited thereto. Three or more high-frequency transformers may be provided.

[0184] (6) In the second embodiment, the resonant inductor is integrated into the winding of the high-frequency transformer, but the present invention is not limited thereto and the resonant inductor may be provided separately. For example, a wire independent of the winding of the high-frequency transformer may be provided to form the resonant inductor.

[0185] (7) In the above embodiments, the leakage inductance / leakage inductance value being the same includes being absolutely the same and being approximately the same within an error range that can be understood by those skilled in the art.

[0186] (8) In the first embodiment, the rectifying circuit portion ReC includes one rectifying circuit, but a number of rectifying circuits corresponding to the number of high-frequency transformers may be provided.

[0187] Figure 7 1 is a schematic diagram showing a high-frequency DC / DC converter circuit in this modification.

[0188] like Figure 7 As shown, the rectifier circuit portion ReC2 includes two rectifier circuits corresponding to the two high-frequency transformers Tr1 and Tr2 provided in the transformer circuit portion TrC.

[0189] The two rectifier circuits of the rectifier circuit unit ReC2 respectively include a fourth bridge arm provided with two diode switches RD1 and RD3 and a fifth bridge arm provided with two diode switches RD2 and RD4, forming a full-bridge rectifier circuit. In the fourth bridge arm, the cathode of the diode switch RD1 is connected to the positive output terminal Po, the anode of the diode switch RD1 is connected to the cathode of the diode switch RD3, and the anode of the diode switch RD3 is connected to the negative output terminal No. In the fifth bridge arm, the cathode of the diode switch RD2 is connected to the positive output terminal Po, the anode of the diode switch RD2 is connected to the cathode of the diode switch RD4, and the anode of the diode switch RD4 is connected to the negative output terminal No.

[0190] In addition, the two rectifier circuits are connected in parallel to each other and share the filter capacitor FC2.

[0191] One connector of the secondary winding of the high-frequency transformer Tr1 of the transformer circuit part TrC is connected to the midpoint of the two diode switches RD1 and RD3 on the fourth bridge arm of the rectifier circuit on the upper side of the figure of the rectifier circuit part ReC, and the other connector of the secondary winding of the high-frequency transformer Tr1 is connected to the midpoint of the two diode switches RD2 and RD4 on the fifth bridge arm of the rectifier circuit.

[0192] One connector of the secondary winding of the high-frequency transformer Tr2 of the transformer circuit part TrC is connected to the midpoint of the two diode switches RD1 and RD3 on the fourth bridge arm of the rectifier circuit on the lower side of the figure of the rectifier circuit part ReC, and the other connector of the secondary winding of the high-frequency transformer Tr2 is connected to the midpoint of the two diode switches RD2 and RD4 on the fifth bridge arm of the rectifier circuit.

[0193] In this way, the high-frequency transformers Tr1 and Tr2 of the transformer circuit portion TrC are connected to the corresponding rectifier circuits of the rectifier circuit portion ReC in parallel with each other on the secondary side.

[0194] Thus, the rectifying circuit unit ReC rectifies the alternating currents from the two high-frequency transformers Tr1 and Tr2 into direct currents using two rectifying circuits, and outputs the DC power in a superimposed manner to the downstream.

[0195] The other structures are the same as those of the first embodiment.

[0196] According to this modified embodiment, it is possible to achieve substantially the same technical effects as those of the first embodiment.

[0197] Furthermore, a high-frequency DC / DC converter module for railway vehicles may also use the circuit structure of the high-frequency DC / DC converter circuit in this modified form, and a railway vehicle may also use the high-frequency DC / DC converter module for railway vehicles that has undergone the above modification.

Claims

1. A high-frequency DC / DC converter circuit for converting power from upstream and outputting it downstream, characterized in that: have: The inverter circuit unit includes an inverter circuit for converting the DC power from the upstream into AC power. a voltage conversion circuit unit including a plurality of high-frequency transformers for converting the AC power from the inverter circuit unit; and a rectifier circuit unit, comprising a rectifier circuit, for rectifying the alternating current from the plurality of high-frequency transformers in the transformer circuit unit into direct current and outputting the direct current in a superimposed manner to a downstream side; The primary windings of the multiple high-frequency transformers are connected in series with the inverter circuit of the inverter circuit unit via a resonant inductor, and the secondary windings of the multiple high-frequency transformers are connected in parallel with the rectifier circuit of the rectifier circuit unit.

2. A high-frequency DC / DC converter circuit for converting power from upstream and outputting it downstream, characterized in that: have: The inverter circuit unit includes an inverter circuit for converting the DC power from the upstream into AC power. a voltage conversion circuit unit including a plurality of high-frequency transformers for converting the AC power from the inverter circuit unit; and a rectifier circuit unit, comprising a rectifier circuit, for rectifying the alternating current from the plurality of high-frequency transformers in the transformer circuit unit into direct current and outputting the direct current in a superimposed manner to a downstream side; The primary windings of the multiple high-frequency transformers are connected to the inverter circuit of the inverter circuit unit in parallel via resonant inductors, and the secondary windings of the multiple high-frequency transformers are connected to the rectifier circuit of the rectifier circuit unit in series.

3. The high-frequency DC / DC converter circuit according to claim 1 or 2, characterized in that: The inverter circuit is a half-bridge inverter circuit.

4. The high-frequency DC / DC converter circuit according to claim 1 or 2, characterized in that: There are two high-frequency transformers.

5. A high-frequency DC / DC converter module for railway vehicles, used to convert power from upstream and output it to downstream in an auxiliary power supply system, characterized in that: have: The inverter unit includes an inverter circuit that converts the DC power from the upstream into AC power; a transformer unit comprising a plurality of high-frequency transformers for transforming the AC power from the inverter unit; and a rectifier unit comprising a rectifier circuit for rectifying the alternating current from the plurality of high-frequency transformers of the transformer unit into direct current and outputting the direct current in a superimposed manner to a downstream side; The primary windings of the multiple high-frequency transformers are connected in series with the inverter circuit of the inverter unit via a resonant inductor, and the secondary windings of the multiple high-frequency transformers are connected in parallel with the rectifier circuit of the rectifier unit.

6. A high-frequency DC / DC converter module for railway vehicles, used to convert power from upstream and output it to downstream in an auxiliary power supply system, characterized in that: have: The inverter unit includes an inverter circuit that converts the DC power from the upstream into AC power; a transformer unit comprising a plurality of high-frequency transformers for transforming the AC power from the inverter unit; and a rectifier unit comprising a rectifier circuit for rectifying the alternating current from the plurality of high-frequency transformers of the transformer unit into direct current and outputting the direct current in a superimposed manner to a downstream side; The primary windings of the multiple high-frequency transformers are connected to the inverter circuit of the inverter unit in parallel via resonant inductors, and the secondary windings of the multiple high-frequency transformers are connected to the rectifier circuit of the rectifier unit in series.

7. The high-frequency DC / DC converter module for railway vehicles according to claim 5 or 6, characterized in that: The inverter circuit is a half-bridge inverter circuit.

8. The high-frequency DC / DC converter module for railway vehicles according to claim 5 or 6, characterized in that: The resonant inductor is a leakage inductance integrated into the windings of each high-frequency transformer. The leakage inductances integrated in the windings of the high-frequency transformers are the same.

9. The high-frequency DC / DC converter module for railway vehicles according to claim 5 or 6, characterized in that: There are two high-frequency transformers.

10. A railway vehicle, characterized in that: have: Converter cabinet; as well as The high-frequency DC / DC converter module for railway vehicles according to any one of claims 5 to 9 is housed in the converter cabinet and converts the power from upstream and outputs it to the downstream load.

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