WO2024028693A1

WO2024028693A1 - System for charging electric vehicles

Info

Publication number: WO2024028693A1
Application number: PCT/IB2023/057489
Authority: WO
Inventors: Kaveh RAZI KAMANAJ OLIA
Original assignee: Stellantis Europe S.P.A.
Priority date: 2022-08-04
Filing date: 2023-07-24
Publication date: 2024-02-08

Abstract

A system (100), comprising: a charging port (10), which comprises an AC port (102) configured to receive an AC supply voltage and a DC port (104) configured to receive a DC supply voltage, the charging port (10) being configured to be coupled to a charging station so as to receive the AC supply voltage or the DC supply voltage therefrom; a first charging unit (12) comprising a positive DC input node (DC+) and a negative DC input node (DC-) coupled to the DC port (104) and configured to receive the DC supply voltage; a second charging unit (20) comprising input nodes (L1, L2, L3, N) and DC output nodes (HV+, HV-) coupled (14) to respective DC output nodes (O+, O-) of the first charging unit (12); and a switch box (11; 11A) coupled to the charging port (10), to the input nodes (L1, L2, L3, N) of the second charging unit (20), as likewise to the positive DC input node (DC+) and to the negative DC input node (DC-) of the first charging unit (12), the switch box (11; 11A) comprising a first set of switches (RL1; RL2, RL3, RL4) configured to couple selectively the AC port (102) to the input nodes (L1, L2, L3, N) of the second charging unit (20) and a second set of switches (RL5; RL6) configured to couple selectively the DC port (104) to the input nodes (L1, L2, L3, N) of the second charging unit (20); the system further comprising control circuitry (18) configured to operate the switch box (11; 11A) so as to couple selectively the AC port (102) to the input nodes (L1, L2, L3, N) of the second charging unit (20) or the DC port (104) to the input nodes (L1, L2, L3, N) of the second charging unit (20) on the basis of the type of voltage and the voltage level received at the charging port (10), applying, as result, a voltage to the positive terminal (B+) and the negative terminal (B-) of the battery (B).

Description

“System for charging electric vehicles”

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TEXT OF THE DESCRIPTION

Technical field

The present disclosure relates to systems for charging electric batteries.

One or more embodiments may be applied to electric vehicles (EVs).

Background

There are currently mainly two modes of charging a battery equipped on board a battery-powered electric vehicle (BEV): one mode is commonly referred to as “AC on-board charging”, and the other mode is commonly referred to as “DC fast charging”. Each BEV is equipped with dedicated electronics for implementing both of the alternative charging modes. A dedicated electronic component for AC on-board charging is commonly referred to as “on-board charging module” (OBCM). Known OBCMs are configured for charging battery vehicles by converting the AC voltage into DC voltage. To do this, the OBCM keeps the AC voltage galvanically insulated from the battery. The DC fast-charging mode comprises coupling a charging station directly to the battery. The type of charging station that is commonly available (for example, in towns) to carry out DC charging is commonly referred to as “electric-vehicle supply equipment” (EVSE). These charging stations are configured for supplying a DC voltage level of approximately 400 V and are able to charge high- voltage (HV) batteries to up to 500 V. Consequently, charging batteries to 800 V using EVSEs at 400 V poses some difficulties.

Existing solutions moreover involve an additional electrical module commonly referred to as “DC boost-charging (DCBC) module”, which comprises a DC-DC boost converter configured to render the voltage of the EVSE suited for charging the batteries to 800 V, enabling charging to 800 V of BEVs starting from a 400-VDC charging station or EVSE. Known DCBC modules comprise a non-insulated DCBC boost converter for boosting the DC voltage from 400 V to 850 V. Such an additional electrical circuitry increases the costs and volume of the vehicle.

Another known solution comprises a switchable battery so as to reach the level of 700 V by connecting in series two separate battery packs at the level of 400 V each. These two 400-V batteries are connected in parallel for being charged by a 400-V EVSE.

Battery packs that comprise switchable batteries are more costly, complex, and have a larger volume. The further space for the power distribution and/or a junction box may entail an economic burden for development of a new battery pack. Power relays present the additional impact of possibly affecting the reliability of the battery pack.

Another solution for dealing with this problem adopts a powerinverter module (PIM) and inductances of an electric motor as a DC-DC boost converter. Such a solution has an impact on the electric motor and on the design of the PIM, increasing costs and area occupation. The solution comprises accessing a star-point connection of the electric motor. This may be complex from the standpoint of design and of the electric motor. Moreover, it affects safety and packaging.

Existing approaches for solving the problem are discussed in the documents listed hereinafter.

WO2021/169143A1 discloses a vehicle-mounted charger compatible with an AC charging pile and a DC charging pile. The vehiclemounted charger comprises an AC-DC module, an internal DC bus, and a switching module, wherein: the AC-DC module is used for connecting to an AC charging pile, converting an alternating current into a direct current, and transmitting the direct current to the internal DC bus; the switching module is used for connecting to a DC charging pile and connecting, according to a switching instruction, a direct current supplied by the DC charging pile to an input end of an AC-DC module or to the internal DC bus; and the internal DC bus is connected to a vehicle load for charging the vehicle load.

US11165349B2 discloses backward-compatible charging circuits and methods for charging a battery to a relatively high voltage level, regardless of whether the charging station is able to supply power at such a relatively high voltage level. The circuitry and the methods can use the on-board charging system to supply a voltage-boosting path to increase the charging voltage from a legacy voltage level (for example, a relatively low voltage level) to a native voltage level (for example, a relatively high voltage level). When a native-voltage charging station charges the battery, the circuitry and the methods according to the embodiments discussed in the document can use a native-voltage path for supplying power, received from the native-voltage charging station, to the battery.

US11203267B2 discloses a dual-voltage charging-station system for an AC power supply and a mobile platform having a charging port that includes a charge coupler, an AC-to-DC converter, a cable, and a controller. The charge coupler has an AC pin and a DC pin, which are configured to interctively engage with the respective AC and DC sockets of the charging port. The conversion stage is connected to the charge coupler and to the AC power supplyconverts the supply voltage to a DC charging voltage. The cable connects the charge coupler so that the AC pins receive the voltage, and the DC pins receive the DC charging voltage.

DE102018006409A1 discloses an energy converter for coupling a DC electrical system to an AC or DC power source, with an AC terminal, which can be electrically coupled to an AC power source, an on-board electrical connection, which can be electrically coupled to the DC electrical system, an LLC converter, which is electrically coupled to the AC-voltage terminal and has a converter inductance, and a rectifier unit, which is electrically coupled to the LLC converter and to the on-board power-supply terminal and comprises at least one rectifier element and a DC-voltage terminal, which is electrically coupled to the rectifier unit and can be electrically coupled to the DC supply.

Notwithstanding the efforts to solve the problem, as witnessed by the documents referred to above, there remains the need for improved solutions.

Object and summary of the invention

The object of one or more embodiments is to contribute to providing an improved solution as referred to above.

According to one or more embodiments, such an object may be achieved via a method that will present the characteristics outlined in the ensuing claims.

One or more embodiments regard a corresponding system.

A battery-charging system for charging a battery electric vehicle (BEV) may provide an example of such a system.

The claims form an integral part of the technical teaching provided herein with reference to the embodiments.

One or more embodiments relate to a corresponding electric-battery vehicle that equips the system according to the present description.

One or more embodiments integrate a DCBC module within an integrated dual-charge module (IDCM) that comprises an OBCM.

One or more embodiments facilitate significant reduction in costs and occupation of space of the charging system in BEVs.

One or more embodiments eliminate the presence of a stand-alone DCBC module.

One or more embodiments advantageously exploit the same power electronics, measurements, controls, and output connectors of the OBCM.

One or more embodiments advantageously exploit the existing cooling systems and ducting.

One or more embodiments may be applied to any BEV that has a battery voltage rating higher than the voltage limit supplied by the DC charging station.

In one or more embodiments, the relays and the switches are integrated in a switch box, advantageously reducing the area occupation.

For instance, the switch box may be configured for selecting the type of charge (AC/DC), maintaining safety of the high-voltage lines.

Brief description of the various views in the drawings

One or more embodiments will now be described, by way of nonlimiting example, with reference to the annexed drawings, wherein:

Figure 1 is a diagram exemplary of a charging system according to one or more embodiments;

Figure 2 is a diagram exemplary of a variant of the charging system according to one or more embodiments;

Figures 3 to 9 are diagrams exemplary of the system represented in Figure 1 that can be used also in the system represented in Figure 2; and Figures 10A and 10B are diagrams exemplary of a vehicle according to the present disclosure.

In the various figures, corresponding references and symbols generally refer to corresponding parts, except where otherwise specified.

The figures have the purpose of illustrating clearly the relevant aspects of the embodiments and are not necessarily drawn to an exact scale.

The extent of the characteristics represented in the figures does not necessarily correspond to the extent of each particular characteristic.

Detailed description of the invention

In the ensuing description, one or more specific details are illustrated in order to enable an in-depth understanding of examples of embodiments of the disclosure. The embodiments may be obtained also without one or more specific details, or with other methods, components, materials, etc. In other cases, known structures, materials, or operations, are not illustrated or described in detail so that certain aspects of the embodiments will not be obscured.

Reference to “an embodiment” or “one embodiment” in the framework of the present description is intended to indicate that a particular configuration, structure, or characteristic described in relation to the embodiment is comprised in at least one embodiment. Consequently, phrases such as “in an embodiment” or “in one embodiment” that may be present in one or more points of the present description do not necessarily refer to one and the same embodiment.

Moreover, particular conformations, structures, or characteristics may be combined in any adequate way in one or more embodiments.

The drawings are in a simplified form and are not at an exact scale.

In the annexed figures, corresponding parts or elements are designated by the same references/numbers, except where otherwise specified, and, for reasons of brevity, a corresponding description will not be repeated for each and every figure.

The references used herein are provided purely for convenience and hence do not define the extent of protection or the scope of the embodiments. For brevity, in what follows one and the same reference may be used to indicate both a node/line in a circuit and a signal that may appear at that node/line.

As exemplified in Figure 1 , an electronic system 100 for charging a battery (for example, on board a BEV) comprises: a charging port 10 (e.g., an electrical socket) configured to be coupled via an interface 101 (e.g., according to an interface known from standards such as the Combined Charging System - CCS2 - and/or the GB/T) to an electrical socket or connector (e.g., provided by an electrical charging station, in a way in itself known) to receive electrical energy therefrom, the charging port 10 comprising an AC charging portion 102 and a DC charging portion 104; a first battery-charging unit 12 (e.g., a high-voltage battery system - HVBS) comprising supply nodes DC+, DC- and an electrically chargeable battery B (e.g., with 800-V rated voltage) having a positive battery terminal B+ and a negative battery terminal B-, the battery being configured to be charged for storing electrical energy when coupled to an electrical supply source, the first battery-charging unit 12 being coupled to the DC charging portion 104 of the charging port 10 via supply nodes DC+, DC- to receive therefrom a DC supply voltage so as to charge (e.g., directly) the battery B, the first charging unit comprising output nodes O+, O-; a second battery-charging unit 20 (for example, an IDCM or an OBCM) configured to receive a supply voltage via one or more input nodes L1 , L2, L3, N, the charging unit 20 being configured to supply a regulated voltage to the output nodes HV+, HV-, the regulated output voltage being supplied at a DC regulated-voltage level on the basis of the supply voltage received; a switch box 11 coupled both to the AC charging portion 102 and to the DC charging portion 104 of the charging port 10 and coupled to the first charging unit 12 and to the second charging unit 20, the switch box 11 being configured to supply the AC or DC supply voltage received at the respective charging portions of the charging port 10 to the first charging unit 12 or the second charging unit 20, as discussed in what follows; a power-distribution centre (PDC) 14 coupled to the first charging unit 12 and to the second charging unit 20 to collect the regulated-voltage level HV+, HV-, supplied through these at a first supply-voltage level or a second supply-voltage level, and supply it to user circuitry II, as well as other high-voltage components; and control circuitry 18 coupled to the switch box 11 , to the first charging unit 12, and to the second charging unit 20, the control circuitry 18 being configured to send control signals with which to direct the AC/DC supply voltage to the battery B, as discussed in what follows.

As exemplified in Figure 1 , the PDC 14 comprises: a first electrical path that couples the positive output node 0+ of the first charging unit 12 to the positive output node HV+ of the second charging unit 20 (for example, via a fuse F); a second current path that couples the negative output node 0- of the first charging unit 12 to the negative output node HV- of the second charging unit 20; and further electrical paths for coupling the output nodes of the first charging unit 12 and of the second charging unit 20 to the user circuits II.

As exemplified in Figure 1 , the AC charging portion 102 of the charging port 10 comprises a plurality of (for example five) contacts LUN, L21N, LSIN, L41N coupled to respective first L1 , second L2, third L3, and fourth N input nodes of the switch box 11 and a contact PEIN coupled to ground.

As exemplified in Figure 1 , the second charging unit 20 comprises: supply nodes L1 , L2, L3, N, configured to receive a supply voltage selected between the AC supply voltage and the DC supply voltage received via the switch box 11 ; and

DC output nodes HV+, HV- configured to supply a regulated voltage VD.

As exemplified in Figure 1 , the second charging unit 20 comprises an on-board charging module (OBCM) 22, 24, 26, 28, comprising: an EMI filter 22 coupled to the AC supply nodes L1 , L2, L3, N and comprising passive elements (such as inductors and capacitors) to filter out noise and electromagnetic interference (EMI), the EMI filter 22 being configured to supply a filtered voltage to the output nodes PA, PB, PC, PD, for example so as to provide both a common-mode filter and a differentialmode filter; power-factor-correction (PFC) circuitry 24 coupled to the EMI filter 22 via the PFC input nodes P1 , P2, P3, PN to receive the filtered voltage therefrom, the PFC circuitry 24 being configured to apply a rectification operation to the filtered voltage, supplying a rectified voltage (such as a (rough) DC voltage with a superimposed AC ripple) as a voltage drop VR across a positive node D1 and a negative node D2; at least one capacitive branch C1 , C2 coupled between the nodes D1 , D2 of the PFC circuitry 24; a DC-DC converter circuit 26 (preferably insulated) coupled to the PFC circuitry 24 and to the capacitive branch C1 , C2 to receive the converted voltage VR, the DC-DC converter circuit 26 being configured to apply a DC conversion to the voltage VR, consequently supplying a DC regulated voltage VD across the output nodes D+, D- of the DC-DC converter circuit 26; a further EMI filter 28 set between the output nodes D+, D- of the DC-DC converter circuit 26 and configured to apply a further EMI-filtering operation 28 to the DC regulated voltage VD, supplying a filtered output voltage (and/or current) to the output nodes HV+, HV- of the second charging unit 20; a first coupling switch 200 set between an input node D10 of the DC-DC converter circuit 26 and an input node PA, PB, PC of the PFC circuitry 24; and a second coupling switch 202 set between an input node D10 of the DC-DC converter circuit 26 and a positive output node D1 of the PFC circuitry 24, the at least one capacitive branch C1 , C2 comprising a first capacitive element C1 set between the positive output node D1 of the PFC circuitry 24 and a negative output node D2 of the PFC circuitry 24, and a second capacitive element C2 (for example, having a capacitance equal to that of the first capacitor) set between the input node D10 of the DC-DC converter circuit 26 and the negative output node D2 of the PFC circuitry 24.

As exemplified in Figure 1 , the second charging unit 20 further comprises a set of contactors K4, K5, K6, which comprises: a first contactor K4 set between an output node PD of the EMI filter 22 and an input node PN of the PFC circuitry 24, a second contactor K5 set between a first (e.g., positive) output node D+ of the DC-DC converter 26 and a first (e.g., positive) node D1 of the PFC circuitry 24 of the second charging unit 20; and a third contactor K6 set between an (e.g., negative) output node D- of the DC-DC converter circuit 26 and a second (e.g., negative) output node D2 of the PFC circuitry 24 of the second charging unit 20.

For instance, the contactors K4, K5, K6 may be electronically controlled mechanical switches that can be selectively switched ON (i.e., closed, with a current path through them rendered conductive) or switched OFF (i.e., opened, with a current path through them rendered non- conductive).

As exemplified in Figure 1 , the first charging unit 12 comprises: a positive input node DC+ and a negative input node DC- coupled to the contacts in the DC charging portion 104 of the charging port 10 for receiving therefrom the DC supply voltage; a positive output node 0+ and a negative output node O- coupled to the PDC 14 for supplying thereto a voltage stored in the electrically charged battery B; and a set of switches K1 , K2, K3, K4 comprising: a first switch K1 , K2 set between a first terminal B+ of the battery and the positive node 0+ (for example, via the resistive element R) of the first charging unit 12, a second switch K2 set between a second terminal B- of the battery and the negative node 0- of the first charging unit 12, and a third (set of) switches K3 set between the positive input node DC+ and the positive output node 0+ of the first charging unit 12 as likewise between the negative input node DC- and the negative output node 0- of the first charging unit 12.

As exemplified in Figure 1 , the switch box 11 comprises a set of switches RL1 , RL2, RL3, RL4, RL5, RL6, which comprises for example: a first switch RL1 set between a first connector LUN of the AC portion 102 of the charging port 10 and a first input node L1 of the second charging unit 20; a second switch RL2 set between a second connector L21N of the AC portion 102 of the charging port and a second input node L2 of the second charging unit 20; a third switch RL3 set between a third connector LSIN of the AC portion 102 of the charging port and a third input node L3 of the second charging unit 20; a fourth switch RL4 set between a fourth connector L41N of the AC portion 102 of the charging port and a fourth input node N of the second charging unit 20; a fifth subset of switches RL5 set between the positive input node DC+ of the DC portion 104 of the charging port 10 and the first input node L1 , the second input node L2, and the third input node L3 of the second charging unit 20; and a sixth switch RL6 set between the negative input node DC- of the DC portion 104 of the charging port 10 and the fourth input node N of the second charging unit 20.

As exemplified in Figure 1 , the set of switches RL1 , RL2, RL3, RL4, RL5, RL6 of the switch box 11 , the set of switches K1 , K2, K3 of the first charging unit 12, as likewise the contactors K4, K5, K6 of the second charging unit 20, are coupled to the control unit 18 and are configured to be driven between an OFF (or open, non-conductive) state and an ON (or closed, conductive) state on the basis of control signals supplied by the control unit 18.

For instance, the control unit 18 is configured to drive the various elements in response to whether the charging port is coupled (via the respective socket, in a way in itself known) to an AC charging station, a DC charging station configured to supply a voltage at the charging level of the battery B (for example, 800 V), or a DC charging EVSE configured to supply a voltage at a voltage level lower than the charging level of the battery (for example, 400 V).

As exemplified in Figure 1 , in response to the charging port being coupled to an AC charging station, the control unit 18 is configured to: drive the contactors K4, K5, K6 so that they will be OFF (i.e. , open), switch the first coupling switch 200 so that it will be OFF (i.e., open) and the second coupling switch 202 so that it will be ON (i.e., closed).

For instance, in the case where the AC charging station is a singlephase station, the control unit 18 is configured to: switch ON (i.e. , close) the second switch K2 in the first charging unit

12; switch OFF (i.e., open) the third switch K3 in the first charging unit

12; switch ON (i.e., close) the first switch RL1 and the fourth switch RL4 in the switch box 11 ; and switch OFF (i.e., open) the second switch RL2, the third switch RL3, the fifth subset of switches RL5, and the sixth switch RL6 in the switch box

11.

In such an exemplary scenario, the second charging unit 20 then receives an AC voltage from the AC portion of the charging port 10 and converts it into a regulated voltage VD supplied to the battery B via coupling of the output nodes HV+, HV- of the second charging unit 20 to the output nodes O+, O- of the first charging unit 12.

For instance, in the case where the AC charging station is a three- phase charging station, the control unit 18 is moreover configured to: switch ON (i.e., close) the second switch K2 in the first charging unit 12; switch OFF (i.e., open) the third switch K3 in the first charging unit 12; switch ON (i.e., close) the first switch RL1 , the second switch RL2, the third switch RL3, and the fourth switch RL4 in the switch box 11 ; and switch OFF (i.e., open) the fifth subset of switches RL5 and the sixth switch RL6.

In such an exemplary scenario, the second charging unit 20 receives and converts the three-phase AC voltage into the DC regulated voltage VR via the PFC circuitry 24 and the DC-DC converter circuit 26.

As exemplified in Figure 1 , in response to the charging port being coupled to a DC charging station configured to supply a voltage such as to match the voltage rating of the battery B, the control unit 18 is configured to: switch ON (i.e., close) the second switch K2 in the first charging unit 12; switch OFF (i.e., open) the third switch K3 in the first charging unit

12, bypassing the switch box and connecting the battery B directly to the DC charging portion of the charging port 10; and switch OFF (i.e. , open) all the switches of the switch box 11 .

In the above charging mode, for example, the DC charging station supplies a DC regulated voltage for charging the battery B approximately up to 900 V, according to the charging capacity of the station.

As exemplified in Figure 1 , in response to the charging port being coupled to a DC charging station such as to supply a voltage at a level lower than the voltage rating of the battery B, the control unit 18 is configured to: switch the first coupling switch 200 so that it will be ON (i.e., closed) and the second coupling switch 202 so that it will be OFF (i.e., open); switch ON (i.e., close) the fifth subset of switches RL5 and the sixth switch RL6 in the switch box 11 , keeping, instead, open the other switches RL1 , RL2, RL3, RL4 in a set of switches of the switch box 11 ; and switch ON (i.e., close) the contactors K4, K5, K6 so as to connect the last input node N of the second charging unit 20 to the input of the PFC circuitry 24, and supply at output, via the PFC circuitry 24 and the DC-DC converter circuit 26, a DC voltage “boosted” with respect to the voltage supplied to the DC input 104 of the charging port 10, the DC boosted voltage being such as to enable charging of the battery B.

For instance, in such an exemplary scenario, it is possible to reach a DC boosted charging power of up to 35 kW and 70 kW via a conventional reference OBC of a power of 11 kW and 22 kW, respectively.

As exemplified in Figure 2, in an alternative scenario, the charging port 10 includes an AC charging portion 102A, which comprises a reduced number of input nodes, such as a first input node LUN and a second input node NIN, with the node PE connected to ground. This scenario represents the system for the configuration required in North America (NA).

In the scenario exemplified in Figure 2, the switch box 11A comprises: a first subset of switches RL1 comprising a switch set between the first input node LUN and the input nodes L1 , L2, L3 of the second charging unit 20 and a switch set between the second input node NIN and the fourth input node N of the second charging unit 20; and a second subset of switches RL5 comprising a switch set between the positive input node DC+ of the DC charging portion 104 of the charging port 10 and the input nodes L1 , L2, L3 of the second charging unit 20 and between the negative input node DC- of the DC charging portion 104 of the charging port 10 and the fourth input node N of the second charging unit 20.

As exemplified in Figure 3, the EMI filter 22 of the second charging unit 20 comprises: passive electronic components CMC2, CMC3, Cx1 , Cx2, Cx3 comprising inductive elements CMC2, CMC3 (for example, a commonmode filter) and capacitors Cx1 , Cx2, Cx2 (for example, Cx1 , Cx2, Cx3 arranged in series and in parallel with one another), the passive circuitry CMC2, CMC3, Cx1 , Cx2, Cx3 being configured for filtering the voltage (and/or the current) received at the input nodes L1 , L2, L3, LN; a first switch RL7 set between the first input node L1 and the second input node L2; and a second switch RL8 set between a fourth output node PD of the EMI filter 22 and a switching node PQ of the PFC circuitry 24.

The first contactor K4 can be integrated in the EMI filter 22 and set in an intermediate position between the fourth output node PD of the EMI filter 22 and the fourth input node PN of the PFC circuitry 24.

As exemplified in Figure 3, the PFC circuitry 24 comprises a plurality of switches in half-bridge configuration H1 , H2, H3, each halfbridge H1 , H2, H3 comprising pairs of switching transistors (e.g., MOSFETs) that form a branch of the circuitry 24; at least one branch is coupled to each of the input nodes P1 , P2, P3, PN of the PFC circuitry 24 via a set of inductors 240, 242, 244. For instance, a first half-bridge H1 is coupled to the first input node P1 via a first inductive element 240, a second half-bridge H2 is coupled to the second input node P2 via a second inductive element 242, a third half-bridge H3 is coupled to the third input node P3 via a third inductive element 244, and a fourth input node PN is coupled to a switching node PQ of the third half-bridge.

As exemplified in Figure 3, the branches of the PFC circuitry 24 are configured to be controlled (e.g., via control signals supplied by the control unit, which is not illustrated in Figure 2) for converting the (AC or DC) filtered voltage received from the EMI filter 22 to a rectified DC voltage VR (e.g., boosted with respect to the input voltage) supplied across the output nodes D1 , D2 of the PFC circuitry 24.

For instance, a PFC circuitry of an active front-end (AFE) bridgeless type with a current of 16 Arms for each phase (e.g., three for three-phase charging) may be suited for use in one or more embodiments.

As exemplified in Figure 3, the capacitive branches C1 , C2 exemplified in Figure 1 and in Figure 2 can be obtained via a series of equivalent capacitances, for example the capacitances C1 , C2 set in series for the first capacitive branch C1 and the capacitances C3, C4 set in series for the second capacitive branch C2.

As exemplified in Figure 3, the PFC circuitry 24 comprises three inductors 240, 242, 244 and one and the same number of half-bridges H1 , H2, H3, this number being provide purely by way of non-limiting example.

As exemplified in Figure 3, the DC-DC converter circuit includes a bidirectional DC-DC converter circuit, in itself known, which comprises: a first set of switching transistors 261 , 262, 263, 264, for example in half-bridge or full-bridge configuration; a transformer 265 coupled to the first set of switching transistors 261 , 262, 263, 264; and a second set of switching transistors 266, 267, 268, 269, for example in half-bridge or full-bridge configuration, coupled to the transformer 265.

As exemplified in Figure 3, the transformer 265 can insulate the output nodes D+, D- from the input side D1 , D2 of the DC-DC converter circuit 26.

For instance, the switching transistors 261 , 262, 263, 264, in combination with the transformer 265, may be controlled via control circuitry 18 (not visible in Figure 3) for controlling conversion of the rectified DC signal VR to a further regulated DC output voltage VD (for example, amplified and insulated) on the basis of the rectified voltage VR supplied by the PFC circuitry 24.

As exemplified in Figure 4, the further EMI filter 28 comprises further passive elements CMC4, CMC5, Cx4, Cx5 (for example a plurality of LC circuit networks comprising a respective inductor CMC4, CMC5 and a respective capacitor Cx4, Cx5). For instance, the further passive elements may comprise commonmode chokes (CMCs) so as to provide both differential-mode and common-mode filtering, in a way in itself known.

As exemplified herein, in addition to operation of the switches K1 , K2, K3, K4, K5, K6 as discussed previously, getting the system exemplified in Figures 1 to 4 to operate comprises: a) in response to the AC portion 102 of the charging port 10 being coupled to an AC source (e.g., a single-phase source): the EMI filter 22 receives the single-phase AC charging voltage at the input nodes L1 , N (in the case of a single-phase source) or at the input nodes L1 , L2, L3, N (in the case of a three-phase source), in response to the AC portion 102 of the charging port 10 being coupled to an AC source (e.g., a single-phase source), the control unit 18 is configured to: switch ON the first switch RL7 and the second switch RL8 so as to supply the AC input voltage to the node PQ of the PFC circuitry (for example, an AFE PFC circuitry comprising up to 32 Arms, for example 2x16 Arms for the EMEA/China standards that can supply a power of up to 7.4 kW to charge the battery); switch OFF (i.e. , open) the contactors K4, K5 and K6; and switch OFF (i.e., open) the first coupling switch 200 and switch ON (i.e., close) the second coupling switch 202; a1 ) in response to the AC portion 102 of the charging port 10 being coupled to a three-phase AC source, the control unit 18 is configured to: switch OFF the first switch RL7 and the second switch RL8 so as to supply the three-phase AC input voltage to the nodes P1 , P2, and P3 of the PFC circuitry (for example, an AFE PFC circuitry comprising up to 16 Arms for each phase, for the EMEA/China standards that can supply a power of up to 11 kW to charge the battery); switch OFF (i.e., open) the contactors K4, K5, and K6; and switch OFF (i.e., open) the first coupling switch 200 and switch ON (i.e., close) the second coupling switch 202; and b) in response to the DC portion 104 of the charging port 10 being coupled to a DC source configured to supply a DC voltage at the first level lower than the voltage rating of the battery B: thanks to the switch box 11 , 11 A, the EMI filter 22 receives the DC voltage at the input nodes L1 , L2, L3, N, in particular with the nodes L1 , L2 and L3 coupled to the positive node DC+ of the DC portion 104 of the charging port 10 and the node N coupled to the negative node DC- of the DC portion 104 of the charging port 10; the control unit 18 is configured to: switch ON (i.e. , close) the contactors K4, K5, and K6; and switch ON (i.e., close) the first coupling switch 200, and switch OFF (i.e., open) the second coupling switch 202; consequently, both the PFC circuitry 24 and the DC-DC converter 26 are connected to the DC input voltage via the EMI filter, boosting the voltage in parallel and supplying, for example, a total boost power of up to 35 kW to the input voltage at the first voltage level (for example, from 500 V to 800 V).

As exemplified in Figure 5, in an alternative embodiment, the EMI filter 22 may comprise a single switch RL7 set between the first input node PA and the second input node PB of the PFC circuitry 24, while the PFC circuitry 24 may comprise a set of four half-bridge branches H1 , H2, H3, H4 with a switching node of the last branch coupled to the input node N of the EMI filter 22.

As exemplified in Figure 5: a) in response to the AC portion 102 of the charging port 10 being coupled to a single-phase AC source: the EMI filter 22 receives the single-phase AC charging voltage at the input nodes L1 , N (in the case of a single-phase source) or at the input nodes L1 , L2, L3, N (in the case of a three-phase source); in response to the AC portion 102 of the charging port 10 being coupled to a single-phase AC source, the control unit 18 is configured to: switch ON the first switch RL7 so as to supply the single-phase AC input voltage to the nodes PA, PB, PQ of the PFC circuitry 24; switch OFF the contactors K4, K5, K6; and switch OFF (i.e., open) the first coupling switch 200, and switch ON (i.e., close) the second coupling switch 202; a1 ) in addition to what has already been mentioned in case a), in the case of use of the circuit of Figure 5 in the system of Figure 2, the input nodes L1 , L2 of the second charging unit 20 are connected in the switch box 11A so as to be suitable for recharging according to the standards in North America (NA); a2) in response to the AC portion 102 of the charging port 10 being coupled to a three-phase AC source, the first switch RL7 is switched OFF (i.e., opened); and b) in response to the DC portion 104 of the charging port 10 being coupled to a DC source configured to supply a DC voltage at the first level lower than the voltage rating of the battery B: thanks to the switch box 11 , the EMI filter 22 receives the DC voltage at the input nodes L1 , L2, L3, N, in particular with the nodes L1 , L2, and L3 coupled to the positive node DC+ of the DC portion 104 of the charging port 10 and the node N coupled to the negative node DC- of the DC portion 104 of the charging port 10; the control unit 18 is configured to: switch ON (i.e., close) the contactors K4, K5, and K6; and switch ON (i.e., close) the first coupling switch 200, and switch OFF (i.e., open) the second coupling switch 202; consequently, both the PFC circuitry 24 and the DC-DC converter 26 are connected to the DC input voltage via the EMI filter, operating in parallel in voltage-boost mode, supplying, for example, a total boost power of up to 35 kW with the input voltage at the first voltage level (for example, from 500 V to 800 V).

As exemplified in Figure 6, in a further variant embodiment the switch 200 coupled between the input node PB of the PFC circuitry 24 and the EMI filter 22 comprises both a first switch RL7, set between the third input node L3 of the EMI filter and the third input node Pc of the PFC circuitry 24, and a second switch RL8, set between the fourth input node N of the EMI filter 22 and the switching node PQ of the last half-bridge branch H3 of the PFC circuitry 24, whilst the PFC circuitry 24 may comprise a set of three half-bridge branches H1 , H2, H3, with the switching node PQ of the last branch coupled to the input node N of the EMI filter 22.

For instance, operation of the circuit exemplified in Figure 6 is substantially similar to what has been discussed with reference to the circuit of Figure 3. For instance, in this configuration, the inductances 240, 244 and the half bridge H1 reach a current of up to 32 Arms each (16 Arms, instead, in Figure 3 and 5) to raise the power that can be reached to 50 kW in boost DC charging mode. For instance, the configuration of Figure 6 may be used for AC charging of up to 11 kW in EMEA/China and NA.

As exemplified in Figure 7, in a further variant embodiment, the PFC circuitry 24 comprises a further inductance L4 coupled to the switching node PQ of a fourth and last half-bridge branch H4, whilst the EMI filter 22 comprises a third switch RL9 set between the third input node PC of the PFC circuitry 24 and the inductance L4, in addition to the first switch RL7 set between the first input node L1 and the second input node L2 of the EMI filter 22, as well as to the second switch RL8 set between the fourth input node N of the EMI filter 22 and the switching node PQ of the PFC circuitry 24.

As exemplified in Figure 7: a) in response to the AC portion 102 of the charging port 10 being coupled to a single-phase AC source: the EMI filter 22 receives the single-phase AC charging voltage at the input nodes L1 , N; the control unit 18 is configured to: switch ON (i.e., close) the first switch RL7 and the second switch RL8, and at the same time switch OFF the third switch RL9 so as to supply the AC input voltage to the input of the PFC circuitry 24; switch OFF (i.e., open) the contactors K4, K5, K6; and switch OFF (i.e., open) the first coupling switch 200 and switch ON (i.e., close) the second coupling switch 202; in this way, the PFC circuitry 24 can charge the battery B, for example developing power up to 7.4 kW; a1 ) in addition to what has already been mentioned in case a), in the case of use of the circuit of Figure 7 in the system of Figure 2, the input nodes L1 , L2 of the second charging unit 20 are connected in the switch box 11 A, so as to be suitable for AC recharging according to the standards in North America (NA); in this scenario, the control unit 18 is configured to: switch OFF (i.e., open) the first switch RL7 and the third switch RL9; switch OFF (i.e., open) the contactors K4, K5, K6; switch ON (i.e., close) the switch RL8; and switch OFF (i.e., open) the first coupling switch 200 and switch ON (i.e., close) the second coupling switch 202; in this way, the PFC circuitry 24 can charge the battery B, for example developing a power of up to 11.5 kW; a2) in response to the AC portion 102 of the charging port 10 being coupled to a three-phase AC source: the EMI filter 22 receives the AC charging voltage at the input nodes L1 , L2, L3, N (in the case of a three-phase source); the control unit 18 is configured to: switch OFF (i.e., open) the first switch RL7 and the third switch RL9, and at the same time switch ON the second switch RL8 so as to supply the AC input voltage to the input of the PFC circuitry 24; switch OFF (i.e., open) the contactors K4, K5, K6; and switch OFF (i.e., open) the first coupling switch 200 and switch ON (i.e., close) the second coupling switch 202; in this way, the PFC circuitry 24 operates as a three-phase AC/DC converter and can supply a three-phase AC charging power of up to 11 kW; and b) in response to the DC portion 104 of the charging port 10 being coupled to a DC source configured to supply a DC voltage at the first level lower than the voltage rating of the battery B: thanks to the switch box 11 , the EMI filter 22 receives the DC voltage at the input nodes L1 , L2, L3, N, in particular with the nodes L1 , L2, and L3 coupled to the positive node DC+ of the DC portion 104 of the charging port 10 and the node N coupled to the negative node DC- of the DC portion 104 of the charging port 10; the control unit 18 is configured to: switch ON (i.e., close) the contactors K4, K5, and K6; switch ON (i.e., close) the third switch RL9 and switch OFF (i.e., open) the first switch RL7 and the second switch RL8; and switch ON (i.e., close) the first coupling switch 200 and switch OFF (i.e., open) the second coupling switch 202; consequently, both the PFC circuitry 24 and the DC-DC converter 26 are connected to the DC input voltage via the EMI filter 22, operating in parallel in voltage-boost mode, supplying, for example, a total boost power of up to 50 kW with the input voltage at the first voltage level (for example, from 500 V to 800 V).

As exemplified in Figures 8 and 9, further variant embodiments may comprise a DC-DC converter of a bidirectional type, for example to implement functions of boost DC charging with a power of up to 70 kW for international applications (for example, EMEA/China and NA) with a conventional OBCM, for example with a 22-kW power base.

As exemplified in Figures 8 and 9, the DC-DC converter 26 includes a DC-DC bidirectional converter, which comprises high-side circuitry 260A low-side circuitry 260B coupled to a positive input node D10, to the positive output node D+, to the negative input node D2 and to the negative output node D-.

For instance, each of the two portions 260A, 260B of the DC-DC converter 26 comprises a first set of switching transistors 261 , 262, 263, 264, a transformer 265, and a second set of switching transistors 266, 267, 268, 269.

As exemplified in Figures 8 and 9, the transformer 265 may insulate the nodes D+, D- from the input side D1 , D2 of the DC-DC converter 26.

For instance, the switching transistors 261 , 262, 263, 264, in combination with the transformer 265, may be controlled via control circuitry 18 (for example, a microcontroller integrated in the OBCM) for controlling conversion of the rectified DC voltage VR to a further regulated DC output voltage VD (for example, to adapt the voltage gain) on the basis of the rectified voltage VR supplied by the PFC circuitry 24.

As exemplified in Figure 8, the EMI filter 22 may even comprise just the contactor K4, without integrating further switches, in particular in combination with a PFC circuitry 24 that comprises four branches H1 , H2, H3, H4. The solution as exemplified in Figure 8 may be convenient in terms of reduction of the overall encumbrance of the circuit, given that it has a reduced number of components.

As exemplified in Figure 9, an embodiment may be substantially the same as the one discussed with reference to Figure 6, except for the use of a bidirectional DC-DC converter circuit 26.

A system 100 as exemplified herein, comprises: a charging port 10 comprising an AC port 102, configured to receive an AC supply voltage, and a DC port 104, configured to receive a DC supply voltage, the charging port 10 being configured to be coupled to a charging station EVSE, ACCS so as to receive the AC supply voltage or the DC supply voltage therefrom; a first charging unit 12 comprising a positive DC input node DC+ and a negative DC input node DC- both coupled to the DC port and configured to receive the DC supply voltage, the first charging unit 12 further comprising: a positive DC output node O+, a negative DC output node O- , as well as a battery B having a positive battery terminal B+ and a negative battery terminal B-; a first switch K2 set between the positive battery terminal and the positive DC output node; a second switch set between the negative battery terminal and the negative DC output node; and a third switch set between the negative DC input node and the negative DC output node, as likewise between the positive DC input node and the positive DC output node; a second charging unit 20 comprising input nodes L1 , L2, L3, N and DC output nodes HV+, HV- coupled 14 to respective DC output nodes of the first charging unit, the second charging unit comprising: an electromagnetic-interference (EMI) filter 22 coupled to the AC input nodes of the second charging unit and configured to carry out EMI filtering of a received supply voltage, supplying a filtered voltage as result; a power-factor-correction (PFC) circuitry 24 comprising PFC input nodes P1 , P2, P3, PN coupled to the EMI filter to receive the filtered voltage therefrom, the PFC circuitry being configured to supply, on the basis of the filtered voltage, a rectified voltage VR across a first PFC output node D1 and a second PFC output node D2; a DC-DC converter circuit 26 coupled to the first D1 and second D2 PFC output nodes to receive the rectified voltage VR, the DC- DC converter circuit being configured to supply, on the basis of the rectified voltage, a regulated voltage VD between the DC output nodes of the second charging unit that are coupled to the respective DC output nodes of the first charging unit; a first contactor K5 set between the first output node of the PFC circuitry and a first output node of the second charging unit 20; a second contactor K6 set between a second output node of the PFC circuitry and a second output node of the second charging unit; a third contactor K4 coupled to (for example, set between) the EMI filter and the PFC circuitry; a coupling circuitry 200, 202 coupled to the PFC circuitry and to the DC-DC converter circuit, the coupling circuitry comprising: a first coupling switch 200 coupled to one input node of the PFC input nodes and to an input node D10 of the DC-DC converter circuit; and a second coupling switch 202 set between a PFC output node and the input node of the DC-DC converter circuit; and a switch box 11 ; 11A coupled to the charging port, to the input nodes of the second charging unit, as likewise to the positive DC input node and to the negative DC input node of the first charging unit, the switch box comprising a first set of switches RL1 ; RL2, RL3, RL4 configured to couple selectively the AC port of the charging port to the input nodes of the second charging unit and a second set of switches RL5; RL6 configured to couple selectively the DC port of the charging port to the input nodes of the second charging unit, the system further comprising control circuitry 18 coupled to the first switch, the second switch, and the third switch of the first charging unit, as likewise to the first set of switches and the second set of switches of the switch box and to the first contactor, the second contactor, and the third contactor of the second charging unit, wherein the control circuitry is configured to: a) in response to the DC supply voltage received at the DC port having a first voltage level: switch OFF the switch in the first set of switches and in the second set of switches of the switch box; switch ON the first switch and the second switch of the first charging unit, coupling the positive DC output node to the positive battery terminal and the negative DC output node to the negative battery terminal; and switch ON the third switch of the first charging unit, coupling the positive DC input node and the negative DC input node to the respective positive and negative DC output nodes, consequently coupling the positive battery terminal and the negative battery terminal to the DC port; and b) in response to the voltage received at the DC port having a second voltage level lower than said first voltage level: switch ON the first switch and the second switch of the first charging unit, coupling the positive DC output node to the positive battery terminal and the negative DC output node to the negative battery terminal; switch OFF the third switch of the first charging unit, decoupling the positive DC input node and the negative DC input node from the respective positive and negative DC output nodes; switch OFF the switches of the first set of switches of the switch box, and switch ON the switches of the second set of switches of the switch box, coupling the DC port to the input nodes of the second charging unit; switch ON the first contactor, the second contactor, and the third contactor; and switch ON the first coupling switch and switch OFF the second coupling switch, so as to supply, using both the PFC circuitry and the DC-DC converter circuit, a boosted voltage VR to the output nodes of the second charging unit as a function of the second voltage level received, and apply, as result, the boosted voltage across the positive and negative terminals of the battery; and c) in response to reception of an AC supply voltage at the AC port: switch ON the first switch and the second switch of the first charging unit, coupling the positive DC output node to the positive battery terminal and the negative DC output node to the negative battery terminal; switch OFF the third switch of the first charging unit, decoupling the positive DC input node and the negative DC input node from the respective positive and negative DC output nodes; switch ON the switches of the first set of switches of the switch box, and switch OFF the switches of the second set of switches of the switch box, coupling the AC port to the input nodes of the second charging unit; switch OFF the first contactor, the second contactor, and the third contactor; and switch OFF the first coupling switch and switch ON the second coupling switch, so as to supply an AC-to-DC converted voltage VD to the output nodes of the second charging unit as a function of the AC supply voltage received, the AC-to-DC converted voltage having a voltage level equal to the first voltage level, and apply, as result, the AC-to-DC converted voltage across the positive and negative terminals of the battery.

As exemplified herein, the battery is configured to be charged at the first voltage level higher than the second voltage level. By way of example, the first voltage level is twice the second voltage level.

As exemplified herein, the DC-DC converter circuit comprises a unidirectional or bidirectional DC-DC converter circuit 260A, 260B.

As exemplified herein, the third contactor is integrated in the EMI filter and is configured for selectively coupling a fourth input node LN of the EMI filter 22 with a fourth input node PN of the PFC circuitry.

As exemplified herein, the EMI filter further comprises at least one switch RL7; RL8; RL9 set between at least one input node of the second charging unit and at least one PFC input node of the PFC circuitry, and the control circuitry is configured to drive the at least one switch of the EMI filter as a function of the AC voltage or of the DC voltage received at the input nodes of the second charging unit.

As exemplified herein, a further electromagnetic-interference (EMI) filter 28 may be set between the first output node, the second output node of the second charging unit and the DC-DC converter circuit, the further EMI filter being configured to carry out EMI filtering of a received supply voltage, supplying a filtered voltage as result.

As exemplified herein, the PFC circuitry comprises a set of halfbridge devices H1 , H4, HN, which comprise switching nodes coupled to the input nodes of the PFC circuitry, the half-bridge devices of the set of half-bridge devices being configured to supply the rectified voltage across the first PFC output node and the second PFC output node.

A battery-powered electric vehicle BEV may be equipped with a system 100 as exemplified herein.

As exemplified in Figure 10A, a vehicle BEV with on board a battery equipped with electronic system 100 according to the present disclosure can be coupled (via a socket provided by the charging station EVSE and coupled to the port 102 or 104) to a charging station EVSE also in the case where the battery B has a voltage rating higher than the one for which the station EVSE is designed.

As exemplified in Figure 10A, in the case where the power supply to the charging station EVSE is at 400 V and is supplied to the DC port 104, the voltage follows the current path EP1 selected via the switch box 11 and is converted by the second charging unit 20 so as to reach the boosted voltage of 800 V, as discussed previously.

As exemplified in Figure 10B, in the case where the charging station EVSE’ is designed to supply a voltage of 800 V, coupling of the latter to the DC charging port 104 via the socket P causes the voltage to reach the battery B directly via the current path EP2.

As exemplified in Figure 10B, in the case where the charging station is an alternating-current charging station ACCS and is coupled to the AC charging port 102 via an AC socket PAC, the voltage follows the current path EP3 via the switch box 11 from the second charging unit 20 to the battery B, as discussed previously.

Without prejudice to the underlying principles, the details and embodiments may vary, even appreciably, with respect to what has been described herein, purely by way of example, without thereby departing from the sphere of protection and the scope of the present invention, as this is defined in the annexed claims.

Claims

1. A system (100), comprising: a charging port (10) comprising an AC port (102) configured to receive an AC supply voltage and a DC port (104) configured to receive a DC supply voltage, the charging port (10) configured to be coupled to a charging station (EVSE, ACCS) to receive the AC supply voltage or the DC supply voltage therefrom, a first charging unit (12) comprising a positive DC input node (DC+) and a negative DC input node (DC-) coupled to the DC port (104) to receive the DC supply voltage therefrom, the first charging unit (12) further comprising: a positive DC output node (O+), a negative DC output node (O-) as well as a battery (B) having a positive battery terminal (B+) and a negative battery terminal (B-); a first switch (K2) interposed the positive battery terminal (B+) and the positive DC output node (O+); a second switch (K2) interposed the negative battery terminal (B-) and the negative DC output node (O-); and a third switch (K3) interposed between the negative DC input node (DC-) and the negative DC output node (O+) as well as between the positive DC input node (DC+) and the positive DC input node (O+); a second charging unit (20) comprising input nodes (L1 , L2, L3, N) and DC output nodes (HV+, HV-) coupled (14) to respective DC output nodes (O+, O-) of the first charging unit (12), the second charging unit (20) comprising: an electromagnetic interference, EMI filter (22) coupled to the input nodes (L1 , L2, L3, N) of the second charging unit (20) and configured to perform EMI filtering of a supply voltage received, providing a filtered voltage as a result; power factor correction, PFC, circuitry (24) comprising PFC input nodes (P1 , P2, P3, PN) coupled to the EMI filter (22) to receive the filtered voltage therefrom, the PFC circuitry (24) configured to provide, based on the filtered voltage, a rectified voltage (VR) across a first PFC output node (D1 ) and a second PFC output node (D2); a DC-DC converter circuit (26) coupled to the first (D1) and to the second (D2) PFC output nodes to receive the rectified voltage (VR), the DC-DC converter circuit (26) configured to provide, based on the rectified voltage (VR), a DC-DC regulated voltage (VD) among said DC output nodes (HV+, HV-) of the second charging unit (20) coupled to respective DC output nodes (O+, O-) of the first charging unit (12); a first contactor (K5) interposed between the first output node (D1 ) of the PFC circuitry (24) and a first output node (HV+) of the second charging unit (20); a second contactor (K6) interposed between a second output node (D1 ) of the PFC circuitry (24, 24A) and a second output node (HV-) of the second charging unit (20); a third contactor (K4) coupled to the EMI filter (22) and the PFC circuitry (24); and coupling circuitry (200, 202) coupled to the PFC circuitry (24) and to the DC-DC converter circuit (26), the coupling circuitry (200, 202) comprising: a first coupling switch (200) coupled to an input node of the PFC input nodes (P1 , P2, P3, PN) and to an input node (D10) of the DC-DC converter circuit (26), and a second coupling switch (202) interposed between a PFC output node (D1 ) and the input node (D10) of the DC- DC converter circuit (26), a switch box (11 ; 11A) coupled to the charging port (10), to the input nodes (L1 , L2, L3, N) of the second charging unit (20) as well as to the positive DC input node (DC+) and to the negative DC input node (DC-) of the first charging unit (12), the switch box (11 ; 11 A) comprising a first set of switches (RL1 ; RL2, RL3, RL4) configured to selectively couple the AC port (102) of the charging port (10) to the input nodes (L1 , L2, L3, N) of the second charging unit (20) and a second set of switches (RL5; RL6) configured to selectively couple the DC port (104) of the charging port (10) to the input nodes (L1 , L2, L3, N) of the second charging unit (20), the system (100) further comprising control circuitry (18) coupled to the first switch (K2), to the second switch (K2), to the third switch (K3) of the first charging unit (12) as well as to the first set of switches (RL1 ; RL2, RL3, RL4) and to the second set of switches (RL5; RL6) of the switchbox (11 ; 11 A) and to the first contactor (K5), to the second contactor (K6) and to the third contactor (K4) of the second charging unit (20), wherein the control circuitry (18) is configured to: a) in response to the DC supply voltage received at the DC port (104) having a first voltage level: switching OFF the switches in the first set of switches (RL1 ; RL2, RL3, RL4) and in the second set of switches (RL5; RL6) of the switch box (11 ; 11 A), switching ON the first switch (K2) and the second switch (K2) of the first charging unit (12), coupling the positive DC output node (0+) to the positive battery terminal (B+) and the negative DC output node (O-) to the negative battery terminal (B-), switching ON the third switch (K3) of the first charging unit (12), coupling the positive DC input node (DC+) and the negative DC input node (DC-) to the respective positive (0+) and negative (O-) output DC nodes, coupling as a result the positive battery terminal (B+) and the negative battery terminal (B-) to the DC port (104); b) in response to the DC supply voltage received at the DC port (104) having a second voltage level lower than said first voltage level: switching ON the first switch (K2) and the second switch (K2) of the first charging unit (12), coupling the positive DC output node (0+) to the positive battery terminal (B+) and the negative DC output node (O-) to the negative battery terminal (B-), switching OFF the third switch (K3) of the first charging unit (12), decoupling the positive DC input node (DC+) and the negative DC input node (DC-) from respective positive (0+) and negative (O-) DC output nodes, switching OFF the switch of the first set of switches (RL1 ; RL2, RL3, RL4) of the switch box (11 ; 11 A) and switching ON the switch of the second set of switches (RL5; RL6) of the switch box (11 ; 11 A), coupling the DC port (104) to the input nodes (L1 , L2, L3, N) of the second charging unit (20), and switching ON the first contactor (K5), the second contactor (K6), and the third contactor (K4), switching ON the first coupling switch (200) and switching

OFF the second coupling switch (202), in order to provide, using both the PFC circuitry (24) and the DC-DC converter circuit (26), a boosted voltage (VR) at the output nodes of the second charging unit (20) as a function of the second voltage level received, and applying the boosted voltage to the ends of the positive (B+) and negative (B-) battery terminals of the battery as a result, c) in response to receiving a AC supply voltage at the AC port (102): switching ON the first switch (K2) and the second switch (K2) of the first charging unit (12), coupling the positive DC output node (O+) to the positive battery terminal (B+) and the negative DC output node (O-) to the negative battery terminal (B-), switching OFF the third switch (K3) of the first charging unit (12), decoupling the positive DC input node (DC+) and the negative DC input node (DC-) from the respective positive (0+) and negative (O-) DC output nodes, switching ON the switches of the first set of switches (RL1 ; RL2, RL3, RL4) of the switch box (11 ; 11 A) and switching OFF the switches of the second set of switches (RL5; RL6) of the switch box (11 ; 11 A), coupling the AC port (102) to the input nodes (L1 , L2, L3, N) of the second charging unit (20) as a result, and switching OFF the first contactor (K5), the second contactor (K6), and the third contactor (K4), switching OFF the first coupling switch (200) and switching ON the second coupling switch (202), in order to provide an AC to DC converted voltage (VD) at the output nodes (HV+, HV-) of the second charging unit (20) as a function of the AC supply voltage received, the AC to DC converted voltage having a voltage level equal to the first voltage level, and applying the AC to DC converted voltage (VD) to the positive (B+) and negative (B-) battery terminals as a result.

2. The system of claim 1 , wherein the battery (B) is configured to be charged at the first voltage level higher than the second voltage level.

3. The system of claim 1 or claim 2, wherein the first voltage level is twice the second voltage level.

4. The system according to any one of the previous claims, wherein the DC-DC converter circuit (26) comprises a unidirectional (26) or a bidirectional (260A, 260B) DC-DC converter circuit.

5. The system of any one of the previous claims, wherein the third contactor (K4) is integrated in the EMI filter (22) and is configured to selectively couple a fourth input node (LN) of the EMI filter (22) with a fourth input node (PN) of the PFC circuitry (24).

6. The system of claim 5, wherein the EMI filter (22) further comprises at least one switch (RL7; RL8; RL9) interposed between at least one input node (L1 , L2, L3, N) of the second charge unit (20) and at least one PFC input node (P1 , P2, P3, PN) of the PFC circuitry (24), and wherein the control circuitry (18) is configured to drive at least one switch (RL7; RL8; RL9) of the EMI filter (22) as a function of the AC voltage or the DC voltage received at the input nodes (L1 , L2, L3, N) of the second charging unit (20).

7. The system (100) according to any one of the previous claims, comprising a further electromagnetic interference, EMI, filter (28) interposed between the first output node (HV+) and the second output node (HV-) of the second charging unit (20) and the DC-DC converter circuit (26), the further EMI filter (28) configured to perform an EMI filtering of a received supply voltage, providing a filtered voltage as a result.

8. The system (100) according to any one of the previous claims, wherein the PFC circuitry (24) comprises a set of half-bridge devices (H1 , H4, HN) comprising switching nodes coupled to the input nodes (P1 , P2, P3, PN) of the PFC circuitry (24), the half-bridge devices in the set of halfbridge devices (H1 , H4, HN) configured to supply the rectified voltage (VR) to the ends of the first PFC output node (D1) and the second output node PFC (D2);

9. A battery-powered electric vehicle (BEV) equipped with a system (100) according to any one of the previous claims.