Patent Publication Number: US-2020280282-A1

Title: Inverter for a photovoltaic plant

Description:
The present invention relates to an inverter for a photovoltaic plant. 
     As is known, an inverter generally comprises a DC section including one or more DC input channels receiving DC electric power from corresponding photovoltaic strings, a DC/AC conversion section providing a DC/AC conversion of DC electric power provided by the photovoltaic strings and an AC section providing AC electric power to an electric power distribution grid, for example the mains. 
     In many cases, as an example when the inverter is capable of carrying out MPPT (Maximum Power Point Tracking) functionalities, each DC input channel is operatively associated with a filtering circuit operatively coupled with a corresponding DC/DC converter. 
     From a structural point of view, in the DC section of these inverters it is possible to identify one or more electronic boards on which the filtering circuits operatively associated with the corresponding DC input channels are mounted, one or more electronic boards on which the electronic circuits of the DC/DC converters operatively associated with the corresponding DC input channels are mounted and one or more modules including the power inductors of the DC/DC converters operatively associated with the corresponding DC input channels. 
     In commonly available inverters for photovoltaic plants, the above-mentioned electronic boards and power inductors are installed in their operating position using arrangements that generally show a poor flexibility in use, as they are mostly bound to the overall number of power inductors to install. 
     Additionally, said known installation arrangements are relatively cumbersome and entail a huge number of mechanical and electrical connections, which makes them generally complex, time-consuming and expensive to implement at industrial level. 
     In the state of the art, it is quite felt the demand for technical solutions capable of solving or mitigating the above-mentioned drawbacks. 
     In order to respond to this need, the present invention provides an inverter, according to the following claim  1  and the related dependent claims. 
     In a general definition, the inverter, according to the invention, comprises a frame structure defining an internal volume and providing mechanical support to one or more components of the inverter. 
     The inverter comprises at least an inverter section, which comprises one or more first electronic boards, one or more second electronic boards and one or more electromagnetic modules electrically connected with said first and second electronic boards. 
     Preferably, the above-mentioned inverter section is at least one between the DC section and the AC section of said inverter. 
     Preferably, when said inverter section is the DC section of the inverter, said one or more first electronic boards include one or more filtering circuits of said DC section and said one or more second electronic boards include one or more switching conversion circuits of said DC section. 
     Each electromagnetic module comprises:
         an electromagnetic component, preferably including a power inductor;   first electric contacts electrically connected with the electromagnetic component and adapted to electrically connect said electromagnetic component with a first electronic board of said inverter section;   second electric contacts electrically connected with the electromagnetic component and adapted to electrically connect said electromagnetic component with a second electronic board of said inverter section;   a supporting frame defining a seat for accommodating the electromagnetic component.       

     The supporting frame comprises one or more first coupling surfaces adapted to mechanically couple with a first electronic board and one or more second coupling surfaces, which are spaced from said first coupling surfaces and are adapted to mechanically couple with one or more supporting members of the frame structure of the inverter. 
     According to an aspect of the invention, the supporting frame of each electromagnetic module comprises opposite upper and lower walls spaced one from another and comprising said first and second coupling surfaces, respectively. 
     According to an aspect of the invention, each electromagnetic module comprises first mechanical connection means adapted to couple said supporting frame with said first electronic board at said first coupling surfaces. 
     According to an aspect of the invention, each electromagnetic module comprises second mechanical connection means adapted to couple its supporting frame with the supporting members of the frame structure of the inverter at said second coupling surfaces. 
     According to an aspect of the invention, each electromagnetic module comprises third mechanical connection means adapted to couple said first electric contacts with corresponding third electric contacts of said first electronic board. 
     According to an aspect of the invention, each electromagnetic module comprises fourth mechanical connection means adapted to couple said second electric contacts with corresponding fourth electric contacts of said second electronic board. 
     According to an aspect of the invention, the supporting frame of each electromagnetic module comprises housing means to define a seat for accommodating said first electric contacts. 
     According to an aspect of the invention, the supporting frame of each electromagnetic module comprises distinct and mutually coupleable first and second frame portions respectively comprising said first and second coupling surfaces. 
     According to an aspect of the invention, each electromagnetic module comprises fifth mechanical connection means adapted to mechanically couple said first and second frame portions one with another. 
     According to an aspect of the invention, the electromagnetic component of each electromagnetic module has a magnetic core and one or more windings wound around said magnetic core. 
     In a further aspect, the present invention relates to an electromagnetic module for a photovoltaic inverter, according to the following claim  15 . 
     In yet a further aspect, the present invention relates to a photovoltaic plant, according to the following claim  16 . 
    
    
     
       Further characteristics and advantages of the present invention will be more apparent with reference to the description given below and to the accompanying figures, provided purely for explanatory and non-limiting purposes, wherein: 
         FIG. 1  schematically illustrates a photovoltaic plant including the inverter, according to the present invention; 
         FIG. 1A  schematically illustrates the DC section of the inverter, according to the present invention; 
         FIGS. 2-10  schematically illustrate different views an electromagnetic module included in the inverter, according to the present invention; 
         FIGS. 11-12  schematically illustrate different views of the structure of the DC section of an embodiment of the inverter, according to the present invention. 
     
    
    
     With reference to cited figures, the present invention relates to an inverter  1  for a low voltage photovoltaic plant  700  (also referred to as “photovoltaic inverter” in the following). 
     For the sake of clarity, it is specified that the term “low voltage” refers to operating voltages lower than 1 kV AC and 2 kV DC. 
     Referring to  FIG. 1 , the photovoltaic apparatus  700  including the photovoltaic inverter  1  is schematically shown. 
     The photovoltaic apparatus  700  comprises one or more photovoltaic strings  100 , each of which may comprise one or more photovoltaic panels electrically connected in series one to another by a power bus (not shown). 
     The photovoltaic strings  100  are electrically connected with the inverter  1  that in turns is electrically connected with an electric power distribution grid  300  (e.g. the mains or a load circuit). 
     The photovoltaic inverter  1  is generally adapted to manage the DC/AC conversion of DC electric power provided by the photovoltaic strings  100  and deliver the AC electric power so obtained to the AC grid  300 . 
     More specifically, the photovoltaic inverter  1  is adapted to receive DC electric power from the photovoltaic strings, to convert said DC electric power into AC electric power and to provide said AC electric power to the electric power distribution grid  300 . 
     The photovoltaic inverter  1  comprises a DC section  1 A, a DC/AC conversion section  1 B and an AC section  1 C. 
     The DC section  1 A includes a DC bus having one or more DC input channels  10 , each of which has an input port adapted to be electrically connected with a corresponding photovoltaic string  100  and an output port electrically connected with the DC/AC conversion section  1 B. 
     As an example, the DC input channels  10  may be designed to convey a DC power in the range of 1-20 kW with voltage levels in the range of 600-2000 V. 
     For each DC input channel  10 , the DC section  1 A comprises a filtering circuit  41  adapted to receive and filter an input DC voltage from a corresponding photovoltaic string  100 . 
     Each filtering circuit  41  may comprise, for example, one or more sensors to detect suitable electric quantities (e.g. voltages and currents) at a corresponding DC input channel  10  and a number of electronic components (e.g. inductors and capacitors) arranged to form a suitable low-pass filtering structure. 
     For each DC input channel  10 , the DC section  1 A comprises a DC/DC converter  10 A adapted to convert said filtered DC voltage in an output DC voltage having a controllable voltage value to be provided to the DC/AC conversion section  1 B. 
     Each DC/DC converter comprises an electromagnetic component (e.g. a power inductor  501 ) and a power conversion circuit  61 . 
     Each power conversion circuit  61  may comprise, for example, one or more sensors to detect suitable electric quantities (e.g. DC currents and DC voltages) and a number of electronic components (e.g. MOSFETs or BJTs) arranged to form a suitable power switching structure. 
     The DC/AC conversion section  1 B is electrically connected between the DC section  1 A and the AC section  1 C. 
     Preferably, the DC/AC conversion section  1 B comprises an input port  20  (also referred to as “DC-link”) electrically connected in parallel with all the output ports of the DC input channels  10  of the DC section  1 A and an output port electrically connected with the AC section  1 C Preferably, the DC/AC conversion section  1 B comprises one or more DC/AC converters (not shown) adapted to provide a DC/AC conversion of DC electric power provided by the photovoltaic strings  100  into AC electric power. 
     Each DC/AC converter comprises an electromagnetic component (e.g. a power inductor) and a power conversion circuit, which may include in turn one or more sensors to detect suitable electric quantities (e.g. currents and voltages) and a number of electronic components (e.g. MOSFETs or BJTs) arranged to form a suitable power switching structure. 
     Preferably, the DC/AC conversion section  1 B comprises one or more filtering circuits (not shown) adapted to suitably filter the AC voltage provided in output by said DC/AC converters. 
     Each filtering circuit may comprise, for example, one or more sensors to detect suitable electric quantities (e.g. voltages and currents) and a number of electronic components (e.g. inductors and capacitors) arranged to form a suitable band-pass filtering structure. 
     The AC section  1 C is electrically connected with the DC/AC conversion section  1 B and the electric power distribution grid  300 . 
     Preferably, the AC section  1 C comprises an input port electrically connected with the output port of the DC/AC conversion section  1 B and a suitable AC bus adapted to deliver the AC electric power provided by the DC/AC conversion section  1 B to the electric power distribution grid  300 . 
     Preferably, the AC section  1 C comprises one or more protection circuits (not shown) to disconnect the inverter from the electric power distribution grid  300  in case of faults and additional filtering circuits (not shown), such as LCL and EMI filtering circuits. 
     Conveniently, the photovoltaic inverter  1  may comprise additional sections, for example a control section operatively associated with the DC section  1 A, the DC/AC conversion section  1 B and the AC section  1 C to control the operation of these latter. 
     Such a control section may include one or more control boards or units, each of which may include one or more digital processing devices (e.g. microcontrollers, DSPs, and the like) and suitable electronic circuits of digital or analog type. 
     In general, most of the components/arrangements of the above-mentioned sections  1 A,  1 B and  1 C of the photovoltaic inverter may be of known type and, hereinafter, they will be described only with reference to the aspects of interest of the invention, for the sake of brevity. 
     According to the invention, the photovoltaic inverter  1  comprises a frame structure  3  that generally defines an internal volume of said inverter and provides mechanical support to the internal components of the inverter. 
     According to the invention, the photovoltaic inverter  1  comprises an inverter section comprising one or more first electronic boards, one or more second electronic boards and one or more electromagnetic modules electrically connected with said first and second electronic boards. 
     In general, the above-mentioned inverter section may be any section of the inverter, the above-mentioned first and second electronic boards may include any electronic circuit of said inverter section and said electromagnetic modules may include any electromagnetic component (e.g. power inductor or transformer) of said inverter section. 
     Preferably, the above-mentioned inverter section may be at least one between the DC section  1 A and the AC section  1 B of the photovoltaic inverter  1 . 
     In  FIGS. 11-12 , there is shown an embodiment of the invention, according to which above-mentioned inverter section is the DC section  1 A of the inverter. 
     In this case:
         the above-mentioned one or more first electronic boards are one or more electronic boards  40  of the DC section  1 A on which the filtering circuits  41  of the DC section  1 A and, possibly, further electronic components are mounted;   the above-mentioned one or more second electronic boards are one or more electronic boards  60  of the DC section  1 A on which the power conversion circuits  61  of the DC/DC converters  10 A and, possibly, further electronic components are mounted;   the above mentioned one or more electromagnetic modules are one or more electromagnetic modules  50  of the DC section  1 A. Each electromagnetic module  50  includes a corresponding electromagnetic component (the power inductor  501 ) of the DC/DC converters  10 A.       

     According to other embodiments of the invention, which are not necessarily alternative to the embodiment shown in  FIGS. 11-12 , above-mentioned inverter section is the AC section  1 A of the inverter. 
     In this case:
         the above-mentioned one or more first electronic boards are one or more electronic boards of the AC section  1 B on which the filtering circuits of the AC section and, possibly, further electronic components are mounted;   the above-mentioned one or more second electronic boards are one or more electronic boards of the AC section  1 A on which the power conversion circuits of the DC/AC converters and, possibly, further electronic components are mounted;   the above mentioned one or more electromagnetic modules are one or more electromagnetic modules of the AC section  1 B. Each electromagnetic module includes a corresponding electromagnetic component (e.g. a power inductor) of the DC/AC converters of the DC/AC conversion section  1 B.       

     The present invention will be now described in further details with particular reference to the embodiment shown in  FIGS. 11-12  for the sake of brevity. However, such a description should not be considered as limitative of the scope of the invention. The features shown in  FIGS. 11-12  may be included with suitable adaptations in other sections of the photovoltaic inverter  1 , e.g. in the DC/AC conversion section  1 B. 
     According to the embodiment shown in  FIGS. 11-12 , the frame structure  3  preferably comprises one or more first supporting members  31  and one or more second supporting members  32  adapted to provide a mechanical support to one or more components of the inverter. 
     Preferably, the first supporting members  31  comprises a supporting plate fixed to additional supporting members (not shown) of the frame structure  3  by suitable mechanical connection means of known type (e.g. screws). 
     Preferably, the supporting plate  31  comprises a first supporting surface  311 , on which the second electronic boards  60  are fixed by suitable mechanical connection means of known type (e.g. screws). 
     Preferably, the supporting plate  31  is capable of conducting heat and it comprises a second supporting surface  312  (preferably opposite to the first supporting surface  312 ) on which heat dissipation means  65  of the DC section  1 A are fixed by suitable mechanical connection means of known type (e.g. screws). 
     As shown in  FIGS. 11-12 , heat dissipation means  65  may include one or more finned heat-dissipating elements adapted to dissipate heat generated by the second electronic boards  60 . 
     Preferably, the second supporting members  32  comprises one or more shaped supporting bars fixed on the first supporting surface  311  of the supporting plate  31  by suitable mechanical connection means of known type (e.g. screws). 
     Preferably, the second supporting members  32  are adapted to provide mechanical support to the electromagnetic modules  50  of the DC section  1 A. 
     According to the invention, each electromagnetic module  50  comprises an electromagnetic component  501 , which preferably has a magnetic core  501 A and one or more windings  501 B wound around said magnetic core. 
     Preferably, the magnetic core  501 A has a toroid-like shape as shown in the cited figures. 
     However, according to possible variants of the invention, the magnetic core  501 A may have different shapes, e.g. a C-like shape or a U-like shape. 
     Preferably, the electromagnetic component  501  is a power inductor, more preferably the power inductor of a DC/DC converter  10 A. 
     In general, the electromagnetic component  501  may be realized according to industrial techniques of known type and, hereinafter, it will be described only with reference to the aspects of interest of the invention, for the sake of brevity. 
     According to the invention, each electromagnetic module  50  has its electromagnetic component  501  electrically connected with a first electronic board  40  and a second electronic board  60  and it is arranged in an intermediate volume between said first and second electronic boards. 
     According to the invention, each electromagnetic module  50  comprises one or more first electric contacts  503  electrically connected with the electromagnetic component  501 . 
     More particularly, each first electric contact  503  is electrically connected with a corresponding terminal (not shown) of a winding  501 B of the electromagnetic component  501 . 
     The first electric contacts  503  are adapted to electrically connect the electromagnetic component  501  with a corresponding first electronic board  40 . 
     To this aim, the first electric contacts  503  are adapted to be coupled with corresponding third electric contacts  401  of a first electronic board  40  ( FIG. 12 ). 
     According to the embodiments shown in the cited figures, each electromagnetic module  50  comprises two pairs of first electric contacts  503  of the ring type. Each first electric contact  503  is electrically connected with a terminal (not shown) of a corresponding winding  501 B of the electromagnetic component  501  and electrically connectable of a corresponding pair of third electric contacts  401  of the ring type of a first electronic board  40 . 
     However, the mutually coupleable first electric contacts  503  and third electric contacts  401  may be arranged according to different solutions, depending on the type of electromagnetic component  501 , on the number of windings included in this latter and on the type of electrical connections to be arranged between each electromagnetic module  50  and the corresponding first electronic board  40 . 
     According to the invention, each electromagnetic module  50  comprises one or more second electric contacts  504  electrically connected with the electromagnetic component  501 . 
     More particularly, each second electric contact  504  is electrically connected with a corresponding terminal (not shown) of a winding  501 B of the electromagnetic component  501 . 
     The second electric contacts  504  are adapted to electrically connect the electromagnetic component  501  with a corresponding second electronic board  60 . 
     To this aim, the second electric contacts  504  are adapted to be coupled with corresponding fourth electric contacts  601  of a second electronic board  60  ( FIG. 12 ). 
     According to the embodiments shown in the cited figures, each electromagnetic module  50  comprises four pairs of second electric contacts  504  of the blade type. Each second electric contact  504  is electrically connected with a terminal (not shown) of a corresponding winding  501 B of the electromagnetic component  501  and electrically connectable of a corresponding pair of fourth electric contacts  601  of the blade type of a second electronic board  60 . 
     However, the mutually coupleable second electric contacts  504  and fourth electric contacts  601  may be arranged according to different solutions, depending on the type of electromagnetic component  501 , on the number of windings included in this latter and on the type of electrical connections to be arranged between each electromagnetic module  50  and the corresponding second electronic boards  60 . 
     According to the invention, each electromagnetic module  50  comprises a supporting frame  502  defining a seat  5020  for accommodating the electromagnetic component  501 . 
     According to the invention, the supporting frame  502  comprises one or more first coupling surfaces  505  mechanically coupleable with a first electronic board  40 , in a distal position from the above-mentioned second electronic board  60 . 
     In this way, the supporting frame  502  conveniently provides a mechanical support to the first electronic board  40  and maintains said first electronic board spaced from the second electronic board  60 . 
     According to the invention, the supporting frame  502  comprises one or more second coupling surfaces  506  mechanically coupleable with the supporting means of the frame structure  3 , in particular with the above-mentioned second supporting members  32  of the frame structure  3 . 
     In this way, the supporting frame  502  is mechanically supported by the frame structure  3 , namely by the second supporting members  32  thereof. 
     Preferably, the supporting frame  502  comprises a box-like structure that is open at its front and rear sides. 
     More particularly, the supporting frame  502  preferably comprises opposite upper and lower walls  5021  and  5022 , which are arranged spaced, respectively, at a distal position and proximal position from the above-mentioned second electronic board  60 , when the electromagnetic module  50  is installed in its normal operating position as shown in  FIGS. 10-11 . 
     Preferably, the upper and lower walls  5021  and  5022  are arranged parallel one to another. 
     Preferably, the upper and lower walls  5021  and  5022  are arranged perpendicular to the opposite upper and lower walls  5021  and  5022 . 
     Preferably, the supporting frame  502  further comprises a pair of opposite lateral walls  5023 , which are mutually spaced and arranged in such a way to join the upper and lower walls  5021  and  5022   
     Preferably, the lateral walls  5023  are arranged parallel one to another. 
     Preferably, the above-mentioned upper, lower and lateral walls  5021 ,  5022  and  5023  have internal surfaces  5025  (mutually facing two by two), which are conveniently shaped in such a way to define the seat  5020  accommodating the electromagnetic component  501 . To this aim, the internal surfaces  5025  are conveniently provided with suitably shaped protruding ribs to hold the electromagnetic component  501  in its operating position ( FIG. 10 ). 
     Preferably, the above-mentioned upper and lower walls  5021  and  5022  include the above-mentioned first and second coupling surfaces  505  and  506 . In this way, the first and second electronic boards  40 ,  60  can lay spaced one from another, preferably along parallel planes. 
     Preferably, the electromagnetic module  50  comprises first mechanical connection means  507  adapted to couple the supporting frame  50  with the first electronic board  40  at the first coupling surfaces  505 . 
     In the cited figures, the first mechanical connection means  507  comprise connection pins of the supporting frame  502  coupleable with corresponding connection holes of the electronic board  40 , in which said connection pins are inserted, and connection holes of the supporting frame  502  and coupleable with corresponding connection holes of the electronic board  40 , in which connection screws are inserted. 
     However, according to possible variants of the invention, the first mechanical connection means  507  may be of different types, according to the needs. 
     Preferably, the electromagnetic module  50  comprises second mechanical connection means  508  adapted to couple the supporting frame  50  with the frame structure  3  (namely with the second supporting members  32 ) at the second coupling surfaces  506 . 
     In the cited figures, the second mechanical connection means  508  comprise shaped engaging protrusions of the supporting frame  502  coupleable with corresponding connection holes of the supporting beams  32 , in which further connection screws are inserted. 
     However, according to possible variants of the invention, the second mechanical connection means  508  may be of different types (e.g. snap-fit connectors), according to the needs. 
     Preferably, the electromagnetic module  50  comprises third mechanical connection means  509  adapted to couple the first electric contacts  503  with the corresponding third electric contacts  401  of the first electronic board  40  ( FIG. 12 ). 
     In the cited figures, the third mechanical connection means  509  comprise connection screws adapted to be inserted through the ring shaped electric contacts  503  and  401 . 
     However, according to possible variants of the invention, the third mechanical connection means  509  may be of different types (e.g. snap-fit connectors), according to the needs. 
     Preferably, the electromagnetic module  50  comprises fourth mechanical connection means  510  adapted to couple the second electric contacts  504  with the corresponding fourth electric contacts  601  of the second electronic board  60 . 
     In the cited figures, the fourth mechanical connection means  510  comprise shaped plug elements of the supporting frame  502 , which protrude from the lower wall  5022  of this latter and which conveniently house the second electric contacts  504 . 
     Each plug element  510  defines a seat in which the second electric contacts  504  are accommodated and mechanically coupled with the walls of said plug element through a shape or snap-fit mechanical coupling. 
     The plug elements  510  are conveniently coupleable with corresponding suitable socket elements  602  of the second electronic board  60 , preferably through a mechanical connection of the shape-coupling type or snap-fit type. 
     This solution is quite advantageous as it allows obtaining a robust screw-less coupling between the electric contacts  504  and  601 , which remarkably facilitates the installation of the electromagnetic modules  50 . 
     Additionally, such a solution facilitates the installation of second first electric contacts  504  on the supporting frame  502  (e.g. through a simple manual operation) and it ensures an easy access to the electric contacts  503  to electrically couple these latter with the third electric contacts  401  of a first electronic board  40 . 
     Preferably, the supporting frame  502  comprises housing means  511  adapted to define one or more seats  511 A to house the first electric contacts  503 . 
     In the cited figures, the housing means  511  comprises one or more shaped protrusions protruding from the upper wall  5021  of the supporting frame  502 , preferably at opposite front and rear sides of this latter (reference is made to a normal operating position of the as shown in the cited figures). 
     The protrusions  511  are conveniently cup-shaped to define a volume in which the first electric contacts  503  are accommodated and mechanically coupled with the walls of the cup-shaped protrusions  511  though a shape or snap-fit mechanical coupling. 
     This solution is quite advantageous as it facilitates the installation of the first electric contacts  503  on the supporting frame  502  (e.g. through a simple manual operation) and it ensures an easy access to the electric contacts  503  to electrically couple these latter with the third electric contacts  401  of a first electronic board  40 . 
     According to some embodiments of the invention, the supporting frame  502  may be formed by a shaped monolithic body, e.g. fabricated in an electrically insulating material. 
     According to other embodiments of the invention shown in the cited figures, however, the supporting frame  502  is formed by multiple portions (e.g. fabricated in an electrically insulating material) that can be assembled together ( FIGS. 8-10 ). 
     Preferably, the supporting frame  502  comprises distinct first and second frame portions  502 A and  502 B that respectively comprise the above-mentioned first and second coupling surfaces  505  and  506 . 
     As shown in the cited figures, the first frame portion  502 A may include the upper wall  5021  and first wall portions  5023 A of the lateral walls  5023 , which are joined to the upper wall  5021 , whereas the second frame portion  502 B may include the lower wall  5022  and second wall portions  5023 B of the lateral walls  5023 , which are joined to the lower wall  5022 . 
     Preferably, the electromagnetic module  50  comprises fifth mechanical connection means  515  to mechanically couple the first and second portions  502 A,  502 B one with another. 
     According to the embodiments shown in the cited figures, the fifth mechanical connection means  515  comprise shaped protrusions and holes of the lateral wall portions  5023 A,  5023 B, which have a complementary shape and can be mutually joined by means to a shape coupling, and engageable wings and recesses of the wall portions  5023 A,  5023 B that can be mutually coupled by means to a snap-fit coupling. 
     However, according to possible variants of the invention, the fifth mechanical connection means  515  may be of different types (e.g. screws), according to the needs. 
       FIGS. 1, 11, 12  show a schematic view of the DC section  1 A of the photovoltaic inverter  1 . 
     A frame structure  3  includes the first and second supporting members  31 ,  32  to mechanically support the electronic boards  60  and the electromagnetic modules  50 . 
     The DC section  1 A comprises twelve input channels  10 , which are intended to be electrically connected with corresponding photovoltaic strings  100  of a photovoltaic plant. 
     The DC section  1 A comprises twelve filtering circuits  41 , each electrically connected with a corresponding input channel  10 . 
     The DC section  1 A comprises two first electronic boards  40 , in which the filtering circuits  41  are mounted (six filtering circuits for each electronic board  40 ). 
     Each first electronic board  40  comprises third electric contacts  401  for electrical connection with the electromagnetic modules  50  (four pairs of electric contacts  401  for each filtering circuit  41 ). 
     The DC section  1 A comprises twelve power conversion circuits  61 , each electrically connected with the input port  20  of the AC section  1 B. 
     The DC section  1 A comprises two second electronic boards  60 , in which the power conversion circuits  61  are mounted (six power conversion circuits for each electronic board  60 ). 
     Each second electronic board  60  comprises four electric contacts  601  for electrical connection with the electromagnetic modules  50  (four pairs of electric contacts  601  for each power conversion circuit  61 ). 
     The DC section  1 A comprises twelve electromagnetic modules  50 , each having an electromagnetic component  501 , a supporting frame  502 , first electric contacts  503  for electrical connection with a first electronic board  40  and second electric contacts  504  for electrical connection with a second electronic board  60 . 
     The DC section  1 A comprises six electromagnetic modules  50  for each first electronic board  40  and second electronic board  60 . 
     Each electromagnetic module  50  is electrically connected to a corresponding filtering circuit  41  by suitably coupling the first electric contacts  503  with the corresponding third electric contacts  401 . 
     Each electromagnetic module  50  is electrically connected to a corresponding power conversion circuit  61  by suitably coupling the second electric contacts  504  with the corresponding fourth electric contacts  601 . 
     The assembly of each electromagnetic module  50  with the corresponding power conversion circuit  61  forms a DC/DC converter  10 A related to a corresponding DC input channel  10 . 
     Each electromagnetic module  50  has thus a number of first electric contacts  503  corresponding to the number of third electric contacts  401  and a number of second electric contacts  504  corresponding to the number of fourth electric contacts  601 , respectively. 
     At its first coupling surfaces  505 , each electromagnetic module  50  mechanically supports a corresponding first electronic board  40  whereas, at its second coupling surfaces  506 , each electromagnetic module  50  is mechanically supported by a pair of supporting members  32  of the frame structure  3 . 
     The present invention provides relevant advantages with respect to the technical solutions of the state of the art. 
     As it is possible to notice, an inverter section of the inverter  1  (e.g. the DC section  1 A) may be realized according to a fully modular structure, which can be easily designed depending on the electric characteristics of the inverter. 
     The number of electronic boards  40 ,  60  and of electromagnetic modules  50  to be employed can thus be easily designed depending on the electrical characteristics of the inverter. 
     The electromagnetic modules  50  can be directly mounted one by one on supporting elements of the frame structure  3  of the inverter. 
     This allows achieving a sturdy mechanical coupling between relatively heavy components such as the electromagnetic modules  50  and the supporting frame structure  3  of the inverter. 
     The electromagnetic modules  50  are adapted to provide themselves the mechanical support for the first electronic boards  40 . 
     In particular, the supporting frame  502  of each electromagnetic module  50  is conveniently designed in such way that the electromagnetic modules  50  form, as a whole, an additional internal supporting structure that defines suitable laying plans on which the first electronic boards  40  may be suitably arranged and at, the same time, defines a suitable space for arranging the second electronic boards  60 . 
     An inverter section (e.g. the DC section  1 A) may thus be realized with an overall “sandwich” structure that has a compact size and allows achieving remarkable space savings. 
     The above-mentioned features provide relevant advantages in terms of size reduction and simplification of internal structure of the inverter with respect to known solutions of the state of the art. 
     An inverter section (e.g. the DC section  1 A) may thus be easily assembled in a modular manner without particular mechanical constraints, as the electromagnetic modules  40  and the first electronic boards  40  can be installed according to a so-called “plug &amp; play” approach without the need of additional supporting structures as it occurs in conventional solutions of the state of the art 
     The inverter  1  shows a compact and robust structure that can be assembled with a relatively small number of operations. The inverter  1  is thus particularly easy and cheap to implement at industrial level.