DE102022209577A1 - Connector assembly - Google Patents

Abstract

The invention relates to a plug assembly (20) for electrically contacting an auxiliary unit (2) of a motor vehicle with a vehicle electrical system, having at least two high-voltage contact elements (34) and three low-voltage contact elements (40a, 40b) and a contact carrier (22) carrying these, the low-voltage contact elements ( 40a, 40b) are connected to a ground potential via at least one interference suppression element (48a, 48b, 48c).

Description

The invention relates to a plug assembly for electrically contacting an auxiliary unit of a motor vehicle with a vehicle electrical system, having at least two high-voltage contact elements and three low-voltage contact elements and a contact carrier carrying them. The invention further relates to an electrical auxiliary unit of a motor vehicle with such a plug assembly.

In the automobile and motor vehicle sector, the components of the motor vehicle are differentiated, for example, into main units and auxiliary units. A main unit is here understood to mean, in particular, a component which enables locomotion or propulsion of the motor vehicle, with an auxiliary unit being understood in particular to mean those (auxiliary and additional) components which are not directly involved in the locomotion or propulsion of the motor vehicle are. An auxiliary unit is understood to mean, for example, a (refrigerant) compressor, an oil or fluid pump, an adjusting drive or the like.

Air conditioning systems are regularly installed in motor vehicles, which air-condition the vehicle interior using a system that forms a refrigerant circuit. Such systems basically have a circuit in which a refrigerant is carried. The refrigerant, for example R-134a (1,1,1,2-tetrafluoroethane) or R-744 (carbon dioxide), is heated on an evaporator and compressed using an auxiliary unit in the form of a (refrigerant) compressor, whereby the refrigerant then absorbed heat is released via a heat exchanger before it is fed back to the evaporator via a throttle.

In such applications, scroll machines are in principle possible as compressors for the refrigerant. Such scroll compressors typically have two scroll parts that are movable relative to one another and operate in the manner of a positive displacement pump. The two scroll parts are typically designed as a nested (helical) pair of spirals or scrolls. This means that one of the spirals at least partially engages with the other spiral. The first (spiral) scroll is fixed in relation to a compressor housing (stationary scroll, fixed scroll), while the second (spiral) scroll (moving scroll, orbiting scroll) is orbitally driven within the first scroll by means of an electric motor.

The electric motor is connected to (motor) electronics for regulation and/or control. The electric motor is usually designed to be brushless, with the individual electrical coils being energized via a bridge circuit on a circuit board of the motor electronics. To protect against environmental influences (dirt, moisture), the engine electronics are usually housed in an electronics room or in an electronics housing. The electronics housing has, for example, a housing connection area in the form of an electrical interface for electrically contacting the electronics.

The electrical interface is preferably designed to be detachable, with the interface generally being designed as a plug connection or as a plug assembly, which is attached or can be attached to the electronics housing. The electrical interface has, for example, a high-voltage connection for powering the electric motor and/or a low-voltage connection for supplying the electronics with control signals. Here and below, high voltage is understood to mean, in particular, a voltage range greater than 60 V (volts), e.g. 470 V, and low voltage, in particular, means a voltage range smaller than 60 V, e.g. 48 V or 12 V.

The high and low voltage connections of the interface are usually designed as separate and spatially separated plugs or terminals. An electrical connection is often provided between the connections as an electrical lock, also referred to as an interlock connection, which must be contacted during assembly if the connections are designed separately. Such separate connections therefore require increased assembly and sealing effort.

To reduce this effort, for example, DE 10 2019 111 691 A1 a combination plug is known as a plug assembly, which has both a high-voltage connection and a low-voltage connection. The (plug-in) contact elements for high-voltage and low-voltage contacting as well as the interlock connection are integrated in a common plastic carrier, which is attached to the electronics or compressor housing.

With such a combination plug, due to the spatially close arrangement of the connections, electromagnetic waves from the high-voltage connections can be coupled into the low-voltage connections - and thus into the electronics or the control unit of the electric motor - and thus negatively influence the EMC (electromagnetic compatibility) of the auxiliary unit.

To improve EMC, for example, interference suppression elements (capacitors, coils, ...) are integrated on the electronics or in the control unit. Additionally or alternatively, connector assemblies can, for example, have electrical shielding to improve EMC, so that other assemblies or electronics, such as the control unit, are kept as free as possible from interference. For example, a sleeve or cylindrical shield contact element is used here, as described in the WO 2021/228294 A1 is described.

The invention is based on the object of specifying a particularly suitable plug assembly for electrically contacting an auxiliary unit of a motor vehicle with a vehicle electrical system. In particular, a connector assembly with improved EMC, especially with regard to a low-voltage connection, should be realized. The invention is also based on the object of specifying a particularly suitable auxiliary unit with such a plug assembly.

The object is achieved according to the invention with regard to the plug assembly with the features of claim 1 and with regard to the auxiliary unit with the features of claim 11. Advantageous refinements and further developments are the subject of the subclaims.

The plug assembly according to the invention is intended for electrical contacting of an auxiliary unit of a motor vehicle with a vehicle electrical system and is suitable and set up for this purpose. When plugged in, the plug assembly in particular forms the electrical interface between the electrical components of the auxiliary unit and an on-board electrical system cable connected to the vehicle electrical system. The plug assembly has a high-voltage connection with two high-voltage contact elements and a low-voltage connection with a number of low-voltage contact elements, in particular three low-voltage contact elements.

The high-voltage connection is in particular intended as a power connection or a power connector for powering an electric motor of the auxiliary unit and is suitable and set up for this purpose. The two high-voltage contact elements are designed, for example, as DC voltage contacts for high-voltage plus (HV+) and high-voltage minus (HV-) of the vehicle electrical system.

The low-voltage connection is intended in particular as a signal connection or a signal plug for power supply and for transmitting control signals to an electronics or control unit of the auxiliary unit and is suitable and set up for this purpose. Two of the low-voltage contact elements are contacted or can be contacted, for example, as supply interfaces with an on-board power supply or a vehicle battery (KL30, KL31), with the third low-voltage contact being contacted or contactable as a signal interface, in particular to a communication or bus line (COM).

The high-voltage connection and the low-voltage connection are carried by a common contact carrier (connection carrier) as a connector housing. In other words, the high-voltage and low-voltage contact elements are integrated into the contact carrier. The plug assembly is therefore designed as a combination plug, in particular as a combined signal and power plug.

The contact carrier, which is designed in particular as an injection-molded part, can preferably be attached mechanically to a housing of the auxiliary unit, for example by means of screw connections. The contact carrier has, for example, an edge-side seal, by means of which the connections are sealed in a fluid-tight manner relative to the housing in the assembled state.

An interlock connection designed as an electrical lock is preferably provided between the connections and arranged on the contact carrier.

According to the invention, the low-voltage contact elements, also referred to below as LV contacts, are connected to a ground potential via at least one interference suppression element. In other words, the NV contacts are electrically contacted with the ground potential, with at least one interference suppression element being connected between the NV contacts and the shielding elements.

Here and in the following, an interference suppression element is to be understood in particular as an electronic component or an electronic component which improves the EMC during operation due to its electrical properties and/or its wiring. In particular, voltage peaks induced in the LV contacts are reduced by means of the interference suppression element and dissipated to the housing potential via the shielding element acting as an interface.

The plug assembly according to the invention thus has at least one integrated interference suppression element to improve the EMC. Thanks to the additional interference suppression and robustness in terms of EMC, a particularly suitable connector assembly is realized. In particular, a compact connector assembly is thus realized, which can be mounted with particularly little assembly, sealing and contacting effort.

In an advantageous development, the high-voltage contact elements, hereinafter also referred to as HV contacts, are enclosed or surrounded by, for example, a cylindrical, tubular, or sleeve-shaped shielding element. The shielding element, designed for example as a (shielding) shield plate, is contacted with a ground potential in the plug-connected or plug-contacted state. In particular, the shielding element is electrically conductively coupled to a housing potential of the (auxiliary unit) housing as a ground potential, with the at least one interference suppression element being coupled in particular to the shielding element for contacting the ground potential. For example, a shielding element according to the WO 2021/228294 A1 be used.

The plug assembly preferably has a number of interference suppression elements, i.e. several interference suppression elements, in particular at least two interference suppression elements, which are connected between the NV contacts and the measurement potential or the shielding element. In an advantageous embodiment, the NV contacts are connected to the shielding element or ground potential via three interference suppression elements. Preferably, a number of interference suppression elements corresponding to the number of NV contacts is provided, with, for example, an interference suppression element being assigned to each NV contact.

For example, (interference suppression) coils, diodes, varistors or other electronic components are used as interference suppression elements. In a preferred embodiment, the interference suppression elements are designed in particular as (interference suppression) capacitors or capacitors. In other words, the individual LV contacts of the vehicle electrical system or the electrical system supply are contacted with the housing potential via capacitors. The NV contact of a signal interface is contacted to ground potential via a capacitor, for example. In addition to the capacitors, other interference suppression elements can also be integrated. This ensures particularly reliable interference suppression of the LV contacts.

In a conceivable further development, the interference suppression elements are arranged in a carrier element (component carrier), which is joined or mounted with a receptacle of the contact carrier. For example, the carrier element is inserted or inserted into the receptacle in a form-fitting and/or non-positive manner. In other words, an interference suppression assembly is provided, which is joined to the carrier element in the course of producing the connector assembly. This results in a higher degree of prefabrication, which simplifies the production of the plug assembly and allows the plug assembly to be produced particularly cost-effectively. The carrier element can, for example, be designed as a plastic carrier and is attached or attachable to the contact carrier, for example by means of hot caulking.

The interference suppression elements can be embedded or integrated in the carrier element or in the plastic carrier. For example, the interference suppression elements are fixed in the carrier element using adhesive, casting, overmolding or clamps. In a preferred embodiment, the interference suppression elements are fixed, in particular mechanically, in the carrier element. This ensures a particularly cost-effective production of the interference suppression assembly, which also enables easy access to the interference suppression elements for repair and maintenance purposes.

In one possible embodiment, the carrier element has an annular wall which is formed in one piece, i.e. in one piece or monolithically, and which surrounds the shielding element on the circumference. In other words, the shielding element sits in the central ring opening of the ring wall. The annular wall is coaxially placed or plugged onto an axially projecting annular collar of the contact carrier. The carrier element is therefore seated on the one hand in the receptacle of the contact carrier and, on the other hand, is held on the annular collar of the contact carrier by means of the annular wall. This results in a two-point fastening or mounting of the carrier element on the contact carrier that prevents rotation and tilting. This ensures a particularly stable connector assembly.

An additional or further aspect of the invention provides that the NV contacts and the interference suppression elements are electrically contacted with the shielding element via a lead frame. The stamped grid, which is designed in particular as a stamped and bent part, can, for example, be encapsulated with the carrier element at least in sections. Preferably, the lead frame is at least mechanically joined to the carrier element. The ends of the lead frame are electrically connected to the LV contacts on the one hand and to the housing potential on the other hand. This results in a simple and effort-reduced connection of the NV contacts to the shielding element or to the housing potential.

In an advantageous embodiment, the lead frame has a ring section which surrounds the shielding element on the circumference. A ring section is understood to mean any conductor track arrangement that contains the shielding element bordered (completely) on the circumference. The ring section is preferably designed as a substantially ring-shaped conductor track. However, the ring section can also be designed to be (poly-)angular.

The ring section is expediently arranged in the area of the ring wall of the plastic carrier. In particular, the ring section is arranged on an end face of the ring wall. The ring section has radially inwardly projecting and axially bent or angled contact tabs which are contacted with the outer circumference of the shielding element.

The electrical contacting of the LV contacts with the lead frame can be achieved, for example, via welding or soldering, or using clamping contacts, insulation displacement contacts or press-fit pins. Accordingly, the electrical contacting of the shielding element or the mass with the lead frame or contact tabs can also be achieved via welding or soldering, or using clamping contacts, insulation displacement contacts or press-fit pins.

In an alternative embodiment, instead of a plastic carrier and a lead frame, a printed circuit board (PCB) is used as a circuit carrier for the interference suppression elements. In other words, the interference suppression elements are connected to the NV contacts and the shielding element or the ground via a circuit board. The circuit board can be easily assembled as a set part during the connector assembly assembly. The interference suppression elements are designed, for example, as SMD components (Surface Mounted Device). It is conceivable, for example, that the interlock connection is integrated on the circuit board.

In one conceivable embodiment, the NV contacts are designed as sword pins (pin contacts, knife contacts). This results in a particularly advantageous design of the NV contacts. Alternatively, a cable solution is also conceivable.

The auxiliary unit according to the invention has a plug assembly described above. This results in a reliable and EMC-improved contact with a vehicle electrical system, which subsequently improves the operation of the auxiliary unit.

For example, the auxiliary unit is a pump, in particular a water or oil pump, such as a lubricant pump. In an alternative to this, the auxiliary unit is an adjustment drive, such as a steering support, i.e. a so-called power steering, a window regulator or an electric seat adjustment. In the assembled state, the auxiliary unit is electrically contacted via the plug assembly with an on-board electrical system of the motor vehicle (vehicle electrical system) and is powered by it. The vehicle electrical system has both a low-voltage electrical system with an electrical voltage of, for example, 12 V, 24 V or 48 V, and a high-voltage network with an electrical voltage of, for example, 60 V, 288 V, 450 V, 650 V, 830 V or 1000 V . For example, when installed, the auxiliary unit is still coupled via signaling to a BUS system, in particular a LIN or CAN bus.

The auxiliary unit particularly preferably has an electrical machine, which is, for example, a generator or an electric motor. The electric motor is, for example, a brushed commutator motor. However, the electric motor is particularly preferably designed to be brushless and is suitably a brushless direct current motor (BLDC). The electric motor is, for example, an asynchronous motor or a synchronous motor.

The auxiliary unit is particularly preferably an electric refrigerant drive, which is in particular an electromotive refrigerant compressor. The electromotive refrigerant compressor is suitably a component of a refrigerant circuit of the motor vehicle, by means of which, for example, temperature control of the interior of the motor vehicle and/or cooling of an energy storage unit of the motor vehicle takes place during operation. In particular, the electromotive refrigerant compressor includes a compressor head, for example a scroll compressor. Particularly preferably, a refrigerant is compressed by means of the electromotive refrigerant compressor, for example a chemical refrigerant such as R134a or R1234yf. Alternatively, CO2 is used as a refrigerant.

• 1 in perspektivischer Darstellung einen elektrischen Kältemittelverdichter als Nebenaggregat,
• 2 in perspektivischer Darstellung ausschnittsweise ein Elektronikfach des Kältemittelverdichters mit einer dran befestigten Steckerbaugruppe,
• 3 in perspektivischer Darstellung die Steckerbaugruppe mit Blick auf eine dem Elektronikfach zugewandten Innenseite,
• 4 eine perspektivische Explosionsdarstellung der Steckerbaugruppe,
• 5 in Draufsicht die Steckerbaugruppe mit Blick auf eine Unterseite,
• 6 in einem Schaltdiagramm eine Verschaltung von Niedervoltkontakten mit einem Abschirmelement, und
• 7 in Draufsicht die Steckerbaugruppe in einer zweiten Ausführungsform mit Blick auf eine Unterseite.

Exemplary embodiments of the invention are explained in more detail below with reference to a drawing. Show in it:

• 1 a perspective view of an electric refrigerant compressor as an auxiliary unit,
• 2 a perspective view of a section of an electronics compartment of the refrigerant compressor with a plug assembly attached to it,
• 3 a perspective view of the connector assembly with a view of the inside facing the electronics compartment,
• 4 a perspective exploded view of the connector assembly,
• 5 in plan view the connector assembly with a view of an underside,
• 6 in a circuit diagram an interconnection of low-voltage contacts with a shielding element, and
• 7 a top view of the plug assembly in a second embodiment with a view of an underside.

Corresponding parts and sizes are always shown with the same reference numbers in all figures.

The 1 shows an auxiliary unit 2 according to the invention, which is installed, for example, as a refrigerant compressor in a refrigerant circuit (not shown) of an air conditioning system of a motor vehicle. The auxiliary unit 2, for example of a modular design, which is also referred to below as the refrigerant compressor 2, has an electric (electric motor) drive (drive module) 4 and a compressor head (compressor module) 6 coupled to it. Between the drive 4 and the compressor head 6, a bearing plate (not shown) is provided as a mechanical interface, by means of which the compressor head 6 is connected to the drive 4 in terms of drive technology.

The end shield forms an intermediate wall between a drive housing 8 and a compressor housing 10. The compressor head 6 is connected (joined, screwed) to the drive 4 by means of flange connections 12 distributed on the circumference and extending in an axial direction A of the refrigerant compressor 2, which are only shown as examples in the figures are provided with reference numbers.

A compressor-side housing section of the drive housing 10 is designed as a motor housing for accommodating an electric motor and is closed on the one hand by an integrated housing intermediate wall (not shown) to an electronics compartment 16 provided with a cover 14 and on the other hand by the end shield. Electronics (not shown in detail), in particular inverter electronics and control electronics or a control device, of the electric motor are accommodated in the electronics compartment 16.

The drive housing 10 has in the area of the electronics compartment 16 a connection section 18 for electrically contacting the electronics to an on-board electrical system of the motor vehicle (vehicle electrical system). The connection section 18 is designed as a housing opening of the electronics compartment 16, which is closed in a fluid-tight manner by means of a plug assembly 20 screw-fastened to the connection section 18. The plug assembly 20 forms the electrical and/or signaling interface to the vehicle electrical system or to an electrical system cable.

The 2 shows a detail of the connection section 18 with the plug assembly 20.

The plug assembly 20 has a contact carrier 22 attached to the electronics housing 16 or to the connection section 18 as a base plate or carrier plate. The contact carrier 22, which is designed, for example, as an injection-molded part, is joined to the connecting section 18, for example, by means of four fastening screws 24 distributed around the circumference, with only three fastening screws 24 in the 2 are visible.

The following based on the 3 to 6 Plug assembly 20 explained in more detail is designed as a combination plug, in particular as a combined signal and power plug, and has a high-voltage connection 26 and a low-voltage connection 28, the connections 26, 28 being arranged on the contact carrier 22 at a spatial distance from one another.

The high-voltage connection 26 is designed as a plug connector with a socket 30 which is integrally formed on the contact carrier 22, i.e. in one piece or monolithically. A cylindrical contact carrier 32 with integrated high-voltage contact elements 34 is inserted into the socket 30, the high-voltage contact elements 34 being embedded, for example overmolded, at least in sections in the contact carrier 32.

The high-voltage connection 26 has at least two high-voltage contact elements 34 (HV+, HV-). The high-voltage contact elements 34 are designed in particular as plug contacts, for example as pin or sword contacts. In addition, the contact carrier 32 can have further contacts, not shown in detail.

To supply power to the electric motor, for example, a mating connector, not shown, which is connected to the power supply cable, is plugged into the socket 26, whereby the electrical high-voltage contact elements 34 are connected to corresponding mating contacts arranged in the mating connector and a current flow via the cable, the mating contacts, the high-voltage contact elements 34, the inverter electronics are implemented into the brushless electric motor. The socket 26 can have a cover 36 to protect the high-voltage contact elements 34. The lid 36 is preferably as a transport protection carried out and is disposed of when the auxiliary unit 2 is installed.

The low-voltage connection 28 is also designed as a plug connector with a socket 38 which is integrally formed on the contact carrier 22, i.e. in one piece or monolithically. The socket 38 can have a cover 39. The cover 39 is preferably designed as a transport protection and is disposed of when the auxiliary unit 2 is installed. The low-voltage connection 28 has three low-voltage contact elements 40a, 40b, which are embedded in the contact carrier 22 or encapsulated by it. The low-voltage contact elements 40a, 40b pass through the contact carrier 22 and face the back or inside of the plug assembly 20, which in the assembled state faces the interior of the housing of the electronics compartment 16. The low-voltage contact elements 40a, 40b are designed in particular as plug contacts, for example as pin or sword contacts. The low-voltage contact elements 40a are contacted or can be contacted as supply interfaces with an on-board power supply or a vehicle battery (KL30, KL31), with the low-voltage contact element 40b being contacted or contactable as a signal interface, in particular to a communication or bus line (COM).

The plug assembly 20 has two interlock connections 42 designed as electrical locks, which are arranged between the high-voltage and low-voltage connections 26, 28. The interlock connections 42 are designed, for example, as conductor tracks or lead frames or busbars.

The contact carrier 22 is designed as an injection-molded part and has a circumferential edge seal 44 on the back, which encloses the high-voltage and low-voltage connections 26, 28 as well as the interlock connections 42, and thus seals it against the connection section 18.

The high-voltage contact elements 34 are enclosed or surrounded by a cylindrical or tubular shielding element 46. The shielding element 46 is arranged between the outer circumference of the contact carrier 32 and the inner circumference of the socket 30. The shielding element 46 has tabs on the front that are bent radially outwards, by means of which the shielding element 46 is electrically conductively coupled to the connection section 18 or the drive housing 8. The shielding element 46 is thus electrically connected to a ground potential in the assembled state.

The low-voltage contact elements 40a, 40b are connected to the shielding element 46 via interference suppression elements 48a, 48b, 48c. The connection of the interference suppression elements 48a, 48b, 48c is shown below based on 5 and 6 explained.

The interference suppression elements 48a, 48b, 48c are designed, for example, as capacitors or capacitors, with the interference suppression elements 48a and 48c each having, for example, a capacity of 1 µF (microfarad) and the interference suppression element 48b a capacity of 100 pF (picofarad).

A lead frame 50 is provided for interconnecting the interference suppression elements 48a, 48b, 48c with the low-voltage contact elements 40a, 40b and with the shielding element 46. Here, the interference suppression element 48b is connected between the low-voltage contact element 40b and one of the low-voltage contact elements 40a (KL31). On the side of the low-voltage contact element 40a, the interference suppression element 48c is interposed between the shielding element 46. The low-voltage contact element 40a (KL30) is connected to the shielding element 46 via the interference suppression element 48a.

For the electrical connection between the lead frame 50 and the shielding element 46, the lead frame 50 has an annular section 52, i.e. an annular conductor track, which surrounds the shielding element 46 on the circumference. The ring section 52 has six contact tabs 54 which are distributed around the circumference and project radially inwards and which are axially bent or angled. In the assembled state, the contact tabs 54 rest on the outer circumference of the shielding element 46 and are electrically contacted with it.

The electrical contacting of the low-voltage contact elements 40a, 40b with the lead frame 50 can be realized, for example, via welding or soldering, or using clamping contacts, insulation displacement contacts or press-fit pins. The electrical contacting of the shielding element 46 with the lead frame 50 or with the contact tabs 54 can also be realized via welding or soldering, or using clamping contacts, insulation displacement contacts or press-fit pins.

The interference suppression elements 48a, 48b, 48c and the lead frame 50 are preferably arranged in a carrier element 56 designed as a plastic carrier. The carrier element 22 here has a receptacle 58, into which the carrier element 56 can be inserted or inserted in a form-fitting and/or non-positive manner. The carrier element 56 is joined to the receptacle 58 in particular by means of hot caulking.

The interference suppression elements 48a, 48b, 48c can be embedded or integrated in the carrier element 56. For example, the interference suppression elements 48a, 48b, 48c are fixed in the carrier element 56 via adhesive, casting, encapsulation or clamps. Alternatively, the interference suppression elements 48a, 48b, 48c are mechanically fixed in the carrier element 56.

The carrier element 56 has a one-piece, i.e. one-piece or monolithic, molded ring wall 60, which surrounds the shielding element 46 on the circumference and on which the ring section 52 rests on the front side. The contact carrier 22 has an axially projecting annular collar 62 as a rear extension of the plug socket 30, onto which the annular wall 60 is attached on the outer circumference.

The 7 shows a second exemplary embodiment for the plug assembly 20, in which a circuit board 64 is used instead of the carrier element 56 and the lead frame 50 for interconnecting the interference suppression elements 48a, 48c. In the exemplary embodiment shown, only the contact elements 40a, each with an interference suppression element 48a, 48c, are guided to the shielding element 46.

The claimed invention is not limited to the exemplary embodiments described above. Rather, other variants of the invention can also be derived by the person skilled in the art within the scope of the disclosed claims without departing from the subject matter of the claimed invention. In particular, all of the individual features described in connection with the various exemplary embodiments can also be combined in other ways within the scope of the disclosed claims without departing from the subject matter of the claimed invention.

Reference symbol list

2

Auxiliary unit/refrigerant compressor

4

drive

6

Compressor head

8th

Drive housing

10

Compressor housing

12

flange connection

14

Lid

16

Electronics compartment

18

Connection section

20

Connector assembly

22

Contact carrier

24

Fastening screws

26

High-voltage connection

28

Low voltage connection

30

Socket

32

Contact carrier

34

High-voltage contact element

36

Lid

38

Socket

39

Lid

40a, 40b

Low voltage contact element

42

Interlock connection

44

poetry

46

Shielding element

48a, 48b, 48c

Suppression element

50

punched grid

52

Ring section

54

contact tab

56

Support element

58

Recording

60

Ring wall

62

Ring collar

64

Circuit board

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102019111691 A1 [0008]
• WO 2021228294 A1 [0010, 0022]

Claims (11)

Plug assembly (20) for electrically contacting an auxiliary unit (2) of a motor vehicle with a vehicle electrical system, comprising at least two high-voltage contact elements (34) and three low-voltage contact elements (40a, 40b) and a contact carrier (22) carrying these, the low-voltage contact elements (40a, 40b) are connected to a ground potential via at least one interference suppression element (48a, 48b, 48c). Plug assembly (20). Claim 1 , characterized in that the high-voltage contact elements (34) are surrounded by an electrically conductive shielding element (46), which is contacted with a ground potential in the plug-connected state. Plug assembly (20). Claim 1 or 2 , characterized in that the low-voltage contact elements (40a, 40b) are connected to the shielding element (46) or the ground potential via three interference suppression elements (48a, 48b, 48c). Connector assembly (20) according to one of the Claims 1 until 3 , characterized in that the at least one interference suppression element (48a, 48b, 48c) is designed as a capacitor. Connector assembly (20) according to one of the Claims 1 until 4 , characterized in that the at least one interference suppression element (48a, 48b, 48c) is arranged in a carrier element (56) which is joined to a receptacle (58) of the contact carrier (22). Plug assembly (20). Claim 5 , characterized in that the at least one interference suppression element (48a, 48b, 48c) is mechanically fixed in the plastic carrier (56). Plug assembly (20). Claim 5 or 6 , characterized in that the plastic carrier (56) has an annular wall (60) which surrounds the shielding element (46) on the circumference and which is placed on a raised annular collar (62) of the contact carrier (22). Connector assembly (20) according to one of the Claims 1 until 7 , characterized in that the low-voltage contacts (40a, 40b) and the at least one interference suppression element (48a, 48b, 48c) are electrically contacted with the shielding element (46) via a lead frame (50). Plug assembly (20). Claim 8 , characterized in that the lead frame (50) has a ring section (52) which surrounds the shielding element (46) on the circumference, the ring section (52) having radially inwardly projecting and axially bent contact tabs (54) which are connected to the outer circumference of the Shielding element (46) are contacted. Connector assembly (20) according to one of the Claims 1 until 9 , characterized in that the low-voltage contact elements (40a, 40b) are designed as sword pins. Ancillary unit (2) of a motor vehicle, in particular a refrigerant compressor, having a plug assembly (20) according to one of Claims 1 until 10 .

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