DE102021210513A1 - Circuit device and method for manufacturing a circuit device for a vehicle - Google Patents

Abstract

A circuit device (100) for a vehicle has a rigid-flex circuit board (102) with a rigid section (104) and a flexible section (106). A transistor device (110) with a transistor (112) is connected to the flexible section (106) of the rigid-flex circuit board (102). A control circuit (108) for outputting a control signal for driving the transistor (112) is arranged on the rigid section (104) of the rigid-flex circuit board (102).

Description

The present invention relates to a shift device and a method for manufacturing a shift device for a vehicle.

A bond wire and signal pin can be used to connect a driver board to a transistor. However, this results in a large inductance, which in turn can lead to oscillation problems.

Against this background, the present invention provides an improved shifting device and an improved method of manufacturing a shifting device for a vehicle according to the independent claims. Advantageous configurations result from the dependent claims and the following description.

A rigid-flex printed circuit board can advantageously be used for electrically contacting fast-switching elements. This allows a connection to be created which has a low inductance. This allows a low inductance loop to be achieved. Such a fast-switching element, for which the use of the rigid-flex circuit board can be advantageous, can be a GaN, SiC or CaO element, for example.

• eine starrflexible Leiterplatte mit einem starren Abschnitt mit einem Schaltungskontakt und einem flexiblen Abschnitt mit einem Transistorkontakt und einer den Schaltungskontakt und den Transistorkontakt verbindenden Leiterbahn;
• eine Transistoreinrichtung mit einem Transistor und einem Steueranschluss für den Transistor, wobei der Steueranschluss mit dem Transistorkontakt des flexiblen Abschnitts der starrflexiblen Leiterplatte verbunden ist; und
• eine Steuerschaltung mit einem Signalanschluss zum Ausgeben eines Steuersignals zum Ansteuern des Transistors, wobei die Steuerschaltung an dem starren Abschnitt der starrflexiblen Leiterplatte angeordnet ist und der Signalanschluss der Steuerschaltung mit dem Schaltungskontakt der starrflexiblen Leiterplatte verbunden ist.

A corresponding switching device for a vehicle has the following features:

• a rigid-flex printed circuit board with a rigid section with a circuit contact and a flexible section with a transistor contact and a conductor track connecting the circuit contact and the transistor contact;
• a transistor device with a transistor and a control connection for the transistor, the control connection being connected to the transistor contact of the flexible section of the rigid-flex circuit board; and
• a control circuit having a signal connection for outputting a control signal for driving the transistor, the control circuit being arranged on the rigid section of the rigid-flex circuit board and the signal connection of the control circuit being connected to the circuit contact of the rigid-flex circuit board.

The circuit device can be part of an electrical system of the vehicle. The vehicle can be an electric vehicle, for example. Known designs can advantageously be used for the rigid-flex circuit board. For example, such a rigid-flex circuit board can consist of a rigid section made up of pressed rigid layers and a flexible section made up of pressed flexible layers. The rigid section can correspond to a conventional circuit board, a so-called printed circuit board. The flexible section can be shaped like a film and thus include flexible conductor tracks. One or more electrical components, for example integrated circuits, can be contacted on a surface of the rigid section. For this purpose, the rigid section can comprise a plurality of contact surfaces in order to make electrical contact with contacts of such electrical components, for example using soldered connections. The circuit contact can be formed as such a contact surface. The flexible section can likewise comprise a plurality of contact surfaces, in particular in an edge region. The flexible section can thus be guided to a component to be contacted and electrically contacted with the component via a corresponding contact surface. Such a contact surface can also be a contact point, which can be formed, for example, by an exposed end of a conductor track routed through the flexible section. The transistor contact of the flexible section can be formed by a corresponding contact area of the flexible section. The conductor track can have an area that is routed inside the rigid section and another area that is routed inside the flexible section. The transistor device may include one or more transistors. Thus, the transistor device can represent a transistor provided with terminals or a transistor circuit comprising at least one transistor. A corresponding transistor can have a housing. It can be a fast-switching transistor. It can be a power transistor. The control circuit can be a driver circuit for driving the transistor. For example, it can be a control circuit such as is used in power electronics, for example in inverters, rectifiers or converters.

For example, the transistor contact of the flexible section of the rigid-flex circuit board can make direct contact with the control terminal of the transistor device. As a result, a high signal quality of a control signal for controlling the transistor can be achieved.

For example, the circuit device can have an ultrasonic weld connection for this purpose, which connects the transistor contact of the flexible section of the rigid-flex circuit board and the control connection of the transistor device de. A secure electrical connection can be achieved with an appropriate ultrasonic welding process.

For example, the control connection of the transistor device can be in the form of a gate contact of the transistor or can be connected to a gate contact of the transistor. The switching behavior of the transistor can be controlled via the gate contact.

For example, the transistor can be implemented as a power transistor. The transistor can thus be used to switch high currents flowing in an electrical system of an electric vehicle.

The transistor can be implemented as a GaN transistor, a SiC transistor or a CaO transistor. Transistors based on the materials mentioned can advantageously be used for power electronics.

The circuit device can have at least one component which is arranged on a surface of the flexible section of the rigid-flex circuit board. The component can be connected to the conductor track. The component can be designed, for example, as an electrical resistor or a capacitor. Due to the arrangement on the flexible section, the component can be arranged very close to the transistor contact. As a result, the signal quality of a signal transmitted via the conductor track can be improved.

According to one embodiment, the transistor device can have a second control connection for the transistor. Correspondingly, the control circuit can have a second signal connection for outputting a further control signal for driving the transistor. The rigid section of the rigid-flex circuit board can have a second circuit contact that is connected to the second signal connection. The flexible section of the rigid-flex circuit board can have a second transistor contact and a second conductor track connecting the second circuit contact and the second transistor contact. The second control connection can be connected to the second transistor contact. A number of conductor tracks can thus be routed over the flexible section, via which a number of electrical connections between the control circuit and the transistor device can be routed.

For example, the second control connection can be in the form of a source contact of the transistor or can be connected to a source contact of the transistor. In this way, the gate and source contacts of the transistor can be controlled via electrical voltages conducted by the control circuit via the flexible section of the rigid-flex circuit board.

According to one embodiment, the circuit device can comprise a further transistor device with a further transistor and a further control connection for the further transistor. The control circuit can correspondingly have a further signal connection for outputting a further control signal for driving the further transistor. The rigid section of the rigid-flex circuit board can have a further circuit contact which can be connected to the further signal connection. The flexible section of the rigid-flex circuit board can have a further transistor contact and a further conductor track connecting the further circuit contact and the further transistor contact.

In this case, the further control connection can be connected to the further transistor contact. Advantageously, the flexible portion can be used in this way to electrically contact a plurality of transistor devices.

According to one embodiment, the circuit device can be designed as an inverter for an electric drive of the vehicle. In this case, the control circuit can be designed in accordance with known driver circuits of known inverters. Thus, the switching device can be used very easily as a replacement for known inverters.

• Bereitstellen einer starrflexible Leiterplatte mit einem starren Abschnitt mit einem Schaltungskontakt und einem flexiblen Abschnitt mit einem Transistorkontakt und einer den Schaltungskontakt und den Transistorkontakt verbindenden Leiterbahn;
• Bereitstellen einer Transistoreinrichtung mit einem Transistor und einem Steueranschluss für den Transistor
• Bereitstellen einer Steuerschaltung mit einem Signalanschluss zum Ausgeben eines Steuersignals zum Ansteuern des Transistors;
• Bestücken des starren Abschnitts der starrflexiblen Leiterplatte mit der Steuerschaltung, wobei der Signalanschluss der Steuerschaltung mit dem Schaltungskontakt der starrflexiblen Leiterplatte verbunden wird; und
• Verbinden des Steueranschluss der Transistoreinrichtung mit dem Transistorkontakt des flexiblen Abschnitts der starrflexiblen Leiterplatte.
• Vorteilhafterweise kann zum Herstellen ein bekannter für starrflexible Leiterplatten geeigneter Bestückungsautomat eingesetzt werden.

A method for producing a circuit device for a vehicle comprises the following steps:

• Providing a rigid-flex circuit board with a rigid section with a circuit contact and a flexible section with a transistor contact and a conductor track connecting the circuit contact and the transistor contact;
• Providing a transistor device with a transistor and a control terminal for the transistor
• providing a control circuit having a signal terminal for outputting a control signal for driving the transistor;
• Equipping the rigid section of the rigid-flex circuit board with the control circuit, the signal connection of the control circuit being connected to the circuit contact of the rigid-flex circuit board; and
• Connecting the control terminal of the transistor device to the transistor contact of the flexible section of the rigid-flex circuit board.
• Advantageously, a known placement machine suitable for rigid-flex circuit boards can be used for the production.

• 1 eine schematische Darstellung einer Schaltungsvorrichtung gemäß einem Ausführungsbeispiel;
• 2 eine schematische Darstellung eines Herstellungsschritts einer Schaltungsvorrichtung gemäß einem Ausführungsbeispiel;
• 3 eine schematische Darstellung einer Schaltungsvorrichtung gemäß einem Ausführungsbeispiel;
• 4 eine Darstellung einer Transistoreinrichtung gemäß einem Ausführungsbeispiel;
• 5 eine schematische Darstellung einer starrflexiblen Leiterplatte gemäß einem Ausführungsbeispiel;
• 6 eine Darstellung einer starrflexiblen Leiterplatte gemäß einem Ausführungsbeispiel;
• 7 ein Ablaufdiagramm eines Verfahrens zum Herstellen einer Schaltungsvorrichtung für ein Fahrzeug; und
• 8 eine schematische Darstellung eines Fahrzeugs mit einer Schaltungsvorrichtung gemäß einem Ausführungsbeispiel.

The invention is explained in more detail by way of example with reference to the accompanying drawings. Show it:

• 1 a schematic representation of a circuit device according to an embodiment;
• 2 a schematic representation of a manufacturing step of a circuit device according to an embodiment;
• 3 a schematic representation of a circuit device according to an embodiment;
• 4 an illustration of a transistor device according to an embodiment;
• 5 a schematic representation of a rigid-flex circuit board according to an embodiment;
• 6 a representation of a rigid-flex circuit board according to an embodiment;
• 7 a flow chart of a method for producing a switching device for a vehicle; and
• 8th a schematic representation of a vehicle with a switching device according to an embodiment.

In the following description of preferred exemplary embodiments of the present invention, the same or similar reference symbols are used for the elements which are shown in the various figures and have a similar effect, with a repeated description of these elements being dispensed with.

1 FIG. 1 shows a schematic representation of a circuit device 100 according to an embodiment. The circuit device 100 has a rigid-flex circuit board 102 with a rigid section 104 and a flexible section 106 and a control circuit 108 and a transistor device 110 which includes at least one transistor 112 . The control circuit 108 is arranged on the rigid section 104 of the rigid-flex circuit board 102 and is connected to the transistor device 110 via the flexible section 106 of the rigid-flex circuit board 102 .

The rigid-flex printed circuit board 102 has a conductor track 120 which connects a circuit contact 122 arranged on the rigid section 104 to a transistor contact 124 arranged on the flexible section 106 .

The control circuit 108 has a signal connection 126 which is electrically contacted at the circuit contact 122, for example by a solder connection. The signal connection 126 is designed, for example, as a solderable connection area or as a solderable connection leg. The transistor device 110 has a control connection 128 which is in electrical contact with the transistor contact 124, for example soldered or welded on. For example, control terminal 128 and transistor contact 124 are connected via an ultrasonic weld connection.

Thus, an operation of the transistor 112 can be controlled by the control circuit 108 via the conductive line 120 . The control circuit 108 includes, for example, one or more integrated circuits and is designed, for example, to receive a request signal from a higher-level control device and to convert it into at least one control signal for controlling the transistor circuit 110 .

For example, the transistor 112 is implemented as a GaN transistor, a SiC transistor or a CaO transistor. According to one embodiment, transistor 112 is implemented as a power transistor. The transistor 112 is embodied as a metal-oxide-semiconductor field-effect transistor, for example. In this case, the control connection 128 is in the form of a gate contact of the transistor 112 or is connected to the gate contact of the transistor 112 .

According to one exemplary embodiment, the rigid-flex circuit board 102 has a second conductor track 130 which connects a second circuit contact 132 arranged on the rigid section 104 to a second transistor contact 134 arranged on the flexible section 106 . Accordingly, the control circuit 108 has, for example, a second signal connection 136 which is electrically contact-connected to the second circuit contact 132 . The transistor device 110 has a second control connection 138 which makes electrical contact with the second transistor contact 134 . Thus, an operation of the transistor 112 can be controlled by the control circuit 108 via the conductor tracks 120, 130. FIG. For example, the second control connection 138 is a source contact of the transistor 112 or connected to the source contact of the transistor 112 .

The control circuit optionally has at least one further signal connection 146 for outputting a further control signal for driving at least one further transistor. The further transistor can, for example, be comprised by the transistor device 110 or by a further transistor device. The other transistor can be contacted via a flexible section 106 or a further flexible section of the rigid-flexible printed circuit board 102 further trace, as for example below with reference to 3 is shown.

2 FIG. 1 shows a schematic representation of a manufacturing step of a method for manufacturing a circuit device according to an embodiment. This is, for example, an embodiment of a circuit device as shown on the basis of 1 is described.

A cross section through the rigid section 104 and the flexible section 106 of the rigid-flex circuit board 102 is shown.

In the rigid section 104, the rigid-flex circuit board 102 has, for example, a layered structure made of at least one copper foil and a rigid plate made of a composite material. In the case of a layer structure comprising a plurality of conductive layers, the rigid section 104 optionally comprises at least one plated-through hole 250, a so-called via, for the electrically conductive connection of conductive layers arranged on different levels.

In the flexible section 106, the rigid-flex circuit board 102 has, for example, a layered structure made of at least one copper foil and one plastic foil.

According to this exemplary embodiment, a free end of a conductor track 120 routed through the flexible section 106 is connected to the control terminal 128 of the transistor device 110, for example by ultrasonic welding.

According to one embodiment, the transistor device 110 is implemented as a power chip that is contacted via the flexible section 106 .

3 FIG. 1 shows a schematic representation of a circuit device 100 according to an embodiment. This is, for example, an embodiment of a circuit device as shown on the basis of 1 is described.

According to the exemplary embodiment shown, the rigid-flex circuit board 102 has a further flexible section 306 in addition to the flexible section 106 . The flexible sections 106, 306 are connected to the rigid section 104. FIG.

According to the exemplary embodiment shown, the flexible section 106 of the rigid-flex circuit board 102 is used in order to contact at least one second transistor device 310 in addition to the transistor device 110 . The second transistor device 310 has at least one second transistor 312 . The contacting of the at least one second transistor device 310 is, for example, based on FIG 1 described contacting of the transistor device 110. The flexible section 106 thus has, for example, at least one further transistor contact 324, 334.

By way of example, the flexible section 106 is shaped in order to contact a total of six transistor devices 110, 310. For example, each of the six transistor devices 110, 310 is designed as a SiC chip. The transistor contacts 124, 134 are suitable for contacting a gate of the transistor devices 110, 310, for example.

According to one exemplary embodiment, at least one component 360 is arranged on a surface of flexible section 106 of rigid-flex circuit board 102 . The component 360 is arranged adjacent to the transistor contacts 124, 134 and is electrically conductively connected, for example, to a conductor track which is led to one of the transistor contacts 124, 134. The component 360 is designed, for example, as an electrical resistor or a capacitor to avoid oscillations.

According to one exemplary embodiment, a corresponding component 360 is assigned to each of the transistor devices 110, 310 connected to the flexible section 106.

According to the embodiment shown, the further flexible section 306 is used to connect further transistor devices 360 to the control circuit 108 . For example, the flexible sections 106, 306 are designed to correspond to one another. Accordingly, the further transistor devices 360 are designed, for example, in accordance with the transistor device 110 and are contacted in accordance with the transistor device 110 .

4 12 shows a representation of transistor devices 110, 310 according to an embodiment. For example, the transistor device 110, 310 form a series connection of two transistors 112, 312.

According to an embodiment, the control connection 128 corresponds to the gate contact and the second control connection 138 to the source contact of the transistor 112. A control connection 428 of the second transistor device 310 corresponds the gate contact and a second control connection 138 of the second transistor device 310 the source contact of the second transistor 312.

If the control terminals 128, 138, 428, 438 are contacted via a flexible portion of a rigid-flex circuit board, as is the case, for example, based on 3 shown, gate loop inductances can be avoided.

According to an alternative embodiment, the transistors 112, 312 are elements of a single transistor device.

5 shows a schematic representation of a rigid-flex circuit board 102 according to an embodiment. It is, for example, a cross-sectional view of a portion of the basis of 3 circuit board described. For example, the rigid section 104 is fitted with components 560, for example in the form of resistors, capacitors, transistors or integrated circuits, both on the upper side and on the lower side.

For example shows 5 a cross-sectional view of a driver board.

6 shows a representation of a rigid-flex circuit board 102 according to an embodiment. The rigid-flex printed circuit board 102 has a rigid section 104 and, for example, three flexible sections 106, 306, 606, which are each connected to the rigid section 104 at one end.

Optionally, one end of the rigid portion 104 is formed as a plug 670.

The rigid section 104 has a plurality of vias 250, conductor tracks 620 and contact areas 626, of which only one is provided with reference symbols for the sake of clarity. For example, contacts of the in 1 shown control circuit and / or in 5 shown components are soldered.

7 shows a flowchart of a method for producing a circuit device for a vehicle according to an embodiment. For example, a switching device can be produced with it, as shown with reference to the preceding figures.

In a step 701, a rigid-flex circuit board, in a step 703 a transistor device and in a step 705 a control circuit is provided, as for example based on FIG 1 are described. In a step 707, the rigid section of the rigid-flex circuit board is fitted with the control circuit. In a step 709, the transistor device is contacted with the flexible section of the rigid-flex circuit board. The sequence of steps 701, 703, 705, 707, 709 is only selected as an example.

8th shows a schematic representation of a vehicle 800 with a circuit device 100 according to an embodiment. This can be an exemplary embodiment of the circuit device 100 described with reference to the preceding figures.

The vehicle 800 is an electric vehicle with a battery 880 and an electric machine 882 for driving at least one wheel of the vehicle 800, purely by way of example AC voltage to drive the electric machine 882.

For example, circuit device 100 for providing the three-phase AC voltage includes six transistors, two of which are connected in series, as is the case, for example, in FIG 4 is shown. For example, the six transistors are contacted via a single flexible section of a rigid-flex circuit board, as shown in 3 is shown.

Thus, the switching device 100 can be embodied, for example, as an inverter for an electric drive of the vehicle 800 .

reference list

100

switching device

102

rigid-flex circuit board

104

rigid section

106

flexible section

108

control circuit

110

transistor device

112

transistor

120

trace

122

circuit contact

124

transistor contact

126

signal connector

128

control port

130

second track

132

second circuit contact

134

second transistor contact

136

second signal connector

138

second control port

146

further signal connection

250

via

306

another flexible section

310

second transistor device

312

second transistor

360

component

428

control port

438

second control port

560

components

606

flexible section

670

Plug

620

traces

626

contact surfaces

701

Providing a rigid-flex circuit board

703

providing a transistor device

705

providing a control circuit

707

equip

709

Connect

800

vehicle

880

battery

882

electric machine

Claims (12)

Circuit device (100) for a vehicle (800), the circuit device (100) having the following features: a rigid-flex printed circuit board (102) with a rigid section (104) with a circuit contact (126) and a flexible section (106) with a transistor contact (124) and a conductor track (120) connecting the circuit contact (126) and the transistor contact (124) ; a transistor device (110) with a transistor (112) and a control connection for the transistor (112), the control connection being connected to the transistor contact (124) of the flexible section (106) of the rigid-flex circuit board (102); and a control circuit (108) with a signal connection (126) for outputting a control signal for driving the transistor (112), wherein the control circuit (108) is arranged on the rigid section (104) of the rigid-flex circuit board (102) and the signal connection (126) the control circuit (108) is connected to the circuit contact (126) of the rigid-flex circuit board (102). Circuit device (100) according to claim 1 , in which the transistor contact (124) of the flexible section (106) of the rigid-flex circuit board (102) makes direct contact with the control terminal of the transistor device (110). Circuit device (100) according to one of the preceding claims, with an ultrasonic weld connection which connects the transistor contact (124) of the flexible section (106) of the rigid-flex circuit board (102) and the control terminal of the transistor device (110). Circuit device (100) according to one of the preceding claims, in which the control connection is in the form of a gate contact of the transistor (112) or is connected to a gate contact of the transistor (112). Circuit device (100) according to one of the preceding claims, in which the transistor (112) is in the form of a power transistor. Circuit device (100) according to one of the preceding claims, in which the transistor (112) is in the form of a GaN transistor, a SiC transistor or a CaO transistor. Circuit device (100) according to one of the preceding claims, with a component which is arranged on a surface of the flexible section (106) of the rigid-flex circuit board (102) and is connected to the conductor track (120), the component acting as an electrical resistor or a Capacitor is running. Circuit device (100) according to one of the preceding claims, in which the transistor device (110) has a second control connection (138) for the transistor (112), the control circuit (108) having a second signal connection (136) for outputting a further control signal for driving of the transistor (112), wherein the rigid section (104) of the rigid-flex circuit board (102) has a second circuit contact (136) which is connected to the second signal connection (136), the flexible section (106) of the rigid-flex circuit board ( 102) has a second transistor contact (134) and a second conductor track (130) connecting the second circuit contact (136) and the second transistor contact (134), the second control connection (138) being connected to the second transistor contact (134). Circuit device (100) according to claim 8 , in which the second control connection is designed as a source contact of the transistor (112) or is connected to a source contact of the transistor (112). Circuit device (100) according to one of the preceding claims, with a further transistor device (310, 360) with a further transistor (312) and a further control connection for the further transistor (312), the control circuit (108) having a further signal connection (146) for outputting a further control signal for driving the further transistor (312), the rigid section (104) of the rigid-flex circuit board (102) having a further circuit contact which is connected to the further signal connection (146), the flexible section (106 ) of the rigid-flex circuit board (102) or a further flexible section (306) of the rigid-flex circuit board (102) has a further transistor contact (324) and a further conductor track connecting the further circuit contact (146) and the further transistor contact (324), the further Control terminal is connected to the further transistor contact (324). Circuit device (100) according to one of the preceding claims, which is designed as an inverter for an electric machine (882) of the vehicle (800). Method for producing a circuit device (100) for a vehicle (800), the method comprising the following steps: Providing (701) a rigid-flex circuit board (102) with a rigid section (104) with a circuit contact (126) and a flexible section (106) with a transistor contact (124) and the circuit contact (126) and the transistor contact (124) connecting conductor track (120); Providing (703) a transistor device with a transistor (112) and a control connection for the transistor (112) providing (705) a control circuit (108) having a signal terminal (126) for outputting a control signal for driving the transistor (112); Equipping (707) the rigid section (104) of the rigid-flex circuit board (102) with the control circuit (108), the signal connection (126) of the control circuit (108) being connected to the circuit contact (126) of the rigid-flex circuit board (102); and Connecting (709) the control terminal of the transistor device to the transistor contact (124) of the flexible section (106) of the rigid-flex circuit board (102).

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