Electronics apparatus and production method for an electronics apparatus

An electronics apparatus having a housing, an inverting device, a first circuit board connected to the inverting device via at least one line, and a second circuit board connected via a first galvanic connection to the first circuit board and connected via a second galvanic connection to at least component, and having a first filter situated on the first circuit board and upstream from the first galvanic connection, the first filter having a first discharge connection to the housing, and having a second filter situated on the second circuit board and downstream from the first galvanic connection, the second filter having a second discharge connection to the housing, and having a third filter situated on the second circuit board and upstream from the second galvanic connection, the third filter having a third discharge connection to the housing. A method for producing an electronics apparatus is also described.

FIELD OF THE INVENTION

The present invention relates to an electronics apparatus. In addition, the present invention relates to a method for producing an electronics apparatus.

BACKGROUND INFORMATION

FIG. 1shows a schematic representation of a conventional electronics apparatus. An example of such an electronics apparatus is for example the energy converter described in U.S. Published Patent Application No. 2007/0296271 A1.

The schematically shown electronics apparatus10has an (expanded) housing12that is capable of being divided (schematically) at least into a high-voltage area12aand a low-voltage area12b. In high-voltage area12athere is situated at least one inverting device14that is electrically connected at the input side to a battery60via a first electrical connection15a, and is electrically connected at the output side to a motor18via a second electrical connection15b. Low-voltage area12bhas at least one component20for operating electronics device10. The schematically shown at least one component20of low-voltage area12bis electrically connected to inverting device14via a first internal line22. A second internal line24connects the at least one component20of low-voltage area12bto a plug connector26attached to housing12, to which an external line28can be coupled for a conductive connection between electronics apparatus10and a further device (not shown).

In order to filter out electromagnetic interferences that may occur in high-voltage area12a, in particular due to parasitic capacitances of the machine winding, electronics apparatus10can additionally be equipped with filter blocks30through34. The depicted electronics apparatus10has a first filter block30that is situated within first electrical connection15abetween battery60and inverting device14. A second filter block32is situated in second electrical connection15bfrom inverting device14to engine18. A third filter block34of low-voltage area12bis situated between second line24and plug connector26. Standardly, each of the filter blocks30through34is fashioned as a specific filter assembly. Such a filter block30through34can be realized as a unit made up of a plurality of capacitors and inductors, and at least one Y capacitor36can provide a low-impedance path38as a feedback path for electromagnetic interference.

SUMMARY

In accordance with the present invention, an example interference suppression design of an electronics apparatus is provided using a plurality of filters situated on at least two circuit boards, whose configuration can also be designated an “in-series connection” of the filters situated on the circuit boards. Using the interference suppression design, high-frequency, high-energy interferences can easily be filtered out. In contrast to the conventional use of expensive filters in the low-voltage area/high-voltage area, which as a rule are very expensive and require a large amount of installation space, the interference suppression design according to the present invention can be realized using filters that are inexpensive and that require little installation space. The example electronics apparatus according to the present invention and the corresponding production method thus may offer in particular a reduction of the installation space of the electronics apparatus, with low manufacturing costs and/or better interference suppression.

The present invention may be advantageous for an electronics apparatus having a high-voltage area in which high-energy high-frequency interferences can occur that conventionally can couple inside the housing and can produce electromagnetic cavity modes in connection above all with the connected cooperating devices, e.g., an engine, an electric machine, a battery, and/or a generator. In contrast, the high-frequency interferences produced in the inverting device (inverter, double inverter) of the electronics apparatus according to the present invention are transferred to other assemblies/circuit boards/hybrids inside the electronics apparatus, and interference in sensitive components/assemblies is suppressed using low-cost filters. Thus, the present invention may offer a low-cost filtering, requiring little installation space, of the connecting lines between the circuit boards and the housing potential, and thus offers a walling off of the connecting paths/coupling paths that lead from the device, in particular from the sealed and shielded high-voltage area, to the surrounding environment.

Compared to a shielding of a circuit board by a lead lining, which, due to a through-hole required for the electrical contacting of the circuit board, does not enable shielding of the circuit board against electromagnetic interferences, the “in-series connection” of the low-cost filters can also protect an electric component situated on a circuit board against electromagnetic interferences. This is ensured in particular if multi-stage filters that are low in cost and that require little installation space, each having a interference discharge line to the housing potential, are used on the connecting plugs on the circuit boards.

The “in-series connection” of at least three filters according to the example interference suppression design described may ensure in particular a reliable filtering out of high-frequency signals, which is the form in which the electromagnetic interferences usually occur. In contrast, useful signals, which are usually transmitted at a lower frequency, are not attenuated by the interference suppression design.

An “in-series connection” of three filters according to the interference suppression design described here may ensure a reliable filtering out of electromagnetic interferences. Thus, the second circuit board can for example be electrically connected, via the second galvanic connection, to an external contact situated in the housing, the “in-series connection” of the three filters ensuring that electromagnetic interference signals are not forwarded to an external device via an electrical connection coupled to the external contact.

In an advantageous development, the second circuit board is electrically connected, via the second galvanic connection, to a third circuit board as the at least one component situated in the housing. In addition, the third circuit board can be electrically connected, via a third galvanic connection, to at least one further component of the electronics apparatus, situated in the housing and/or on the housing. Preferably, in this case the electronics apparatus includes a fourth filter having a fourth discharge connection to the housing, situated on the third circuit board and downstream from the second galvanic connection, and a fifth filter having a fifth discharge connection to the housing, situated on the third circuit board and upstream from the third galvanic connection. This “in-series connection” ensures a reliable filtering out of electromagnetic interferences even given the use of five preferably low-cost filters. In this way, it is ensured that the additional component of the electronics apparatus, connected to the third circuit board via the third galvanic connection, is reliably shielded against electromagnetic interferences. In particular, the third circuit board can be electrically connected via the third galvanic connection to an external contact situated in the housing as further component of the electronics apparatus. In this case, it may be ensured that an external device coupled electrically to the external contact is reliably protected from the electromagnetic interferences.

It is to be noted that the electronics apparatus is not limited to a number of three circuit boards and/or five filters. The additional equipping of the electronics apparatus with the fourth and the fifth filter is optional. Likewise, the electronics apparatus may have more than three circuit boards and/or five filters.

The first filter, the second filter, the third filter, the fourth filter, and/or the fifth filter can be fashioned as T filters. In this way, low-cost filters that require little installation space can be used for the electronics apparatus.

Simultaneously, the advantageous interference suppression may be ensured even with the use of such low-cost and small T filters.

The first galvanic connection, the second galvanic connection, and/or the third galvanic connection can each have at least one wire and/or one cable.

Preferably, the first galvanic connection has a first ribbon cable, the second galvanic connection has a second ribbon cable, and/or the third galvanic connection has a third ribbon cable. Such a realization of the first galvanic connection, the second galvanic connection, and/or the third galvanic connection brings about an inductance of the respective galvanic connection for high-frequency interferences. In contrast, useful signals are unproblematically transmitted via a ribbon cable. Thus, at least one galvanic connection having a ribbon cable brings about a reliable filtering out of interferences with simultaneous undisturbed transmission of useful signals. Instead of a ribbon cable, at least one of the above-named galvanic connections can also have a different type of cable and/or a wire.

For example, the first ribbon cable, the second ribbon cable, and/or the third ribbon cable can have a length in a range of from 5 cm to 50 cm, and/or a width in a range of from 3 cm to 10 cm. Advantageously, the at least one ribbon cable has a length of from 10 cm to 30 cm, preferably of from 15 cm to 25 cm. The width of the at least one ribbon cable can in particular be in a range of from 5 cm to 10 cm. Given such a realization of the at least one ribbon cable, a reliable filtering out of the high-frequency interference signals is reliably ensured at low cost, with simultaneous undisturbed transmission of the desired useful signals.

In particular, the first filter, the first galvanic connection, and the second filter can work together as a first pi filter (πfilter), and/or the third filter, the second galvanic connection, and the fourth filter can work together as a second pi filter (πfilter). Preferably, the filters and the galvanic connections are fashioned in such a way that one can speak of an “in-series connection” of pi filters. Such a filter design can be realized at low cost and requires little installation space. In comparison with a conventional filter, such a filter design having at least one pi filter fashioned in this way has an advantageous filter characteristic, is producible at low cost, and requires little installation space.

In a development, the electronics apparatus can include at least one plate-type shielding unit that is fashioned at least partly of a conductive material and that is electrically connected to the allocated discharge connection of the first, second, third, fourth, and/or fifth filter and to the housing. Such a shielding unit, for example a shielding plate and/or a housing formed part, improves the filtering out of the undesired interference signals, and reduces mode interference. In addition, such a shielding unit is producible at low cost. The shielding unit requires very little additional installation space on the electronics apparatus. In particular, the electronics apparatus can have a plurality of such shielding units, configured in an electrical contact to the discharge connections of various filters. In addition, the described filters and the at least one plate-type shielding unit also bring about an attenuation of electromagnetic modes that could otherwise travel into the surrounding environment in an uncontrolled manner via a low-voltage connection.

For example, on the first circuit board there can be fashioned an inverter controlling, on the second circuit board there can be fashioned a control electronics system, and/or on the third circuit board there can be fashioned a plug electronics system. Such circuit boards can advantageously be used for a broad spectrum of electronics apparatuses, for example in a power electronics system, in a pulse inverter, or in a converter.

The electronics apparatus can be fashioned as a power electronics system, as a pulse inverter, as a hybrid engine, and/or as a DC/DC converter. Such a design of the electronics apparatus can be used above all in a vehicle in order to ensure a high standard of safety, due to the advantageous filter design of the electronics apparatus.

The advantages described above can also be realized using a corresponding production method.

DETAILED DESCRIPTION OF EXAMPLE EMBODIMENTS

FIG. 2shows a schematic representation of a specific embodiment of the electronics apparatus.

Electronics apparatus50shown schematically inFIG. 2has an (expanded) housing52that is fashioned at least partly from a conductive material. The conductive material of housing52can be a metal and/or a doped semiconductor material. Preferably, housing52is made completely of the conductive material.

In the depicted specific embodiment, the interior space of housing52can be divided (schematically) at least into an interference area, fashioned as high-voltage area54, and at least one area that is fashioned as low-voltage area56and is decoupled by the filtering described below. However, electronics apparatus50is not limited to such a division into at least one interference area and at least one decoupled area, or to the realization of these as high-voltage area54and low-voltage area56. Instead, the depicted division is intended to demonstrate merely as an example that the technology according to the present invention described below is also applicable to an electronics apparatus50in which, during operation of electronics apparatus50, a high voltage is applied to at least one component, while for at least one other component of electronics apparatus50the application of a significantly reduced voltage is preferred.

Depicted electronics apparatus50has an inverting device58that is preferably situated in high-voltage area54. Inverting device58, which for example can also be referred to as an inverter and/or as a converter (e.g., a DC/DC converter), can include at least one bipolar transistor having an insulated gate electrode (IGBT, Insulated Gate Bipolar Transistor). Optionally, a battery60and/or a motor62(electric motor) can also be situated inside housing52. Because electronics apparatus50, as described in more detail below, can be fashioned with a significantly reduced extension/significantly reduced installation space requirement, the additional situation of battery60and/or of motor62inside housing52, preferably in high-voltage area54, is easily realizable. In this case, it is possible to connect inverting device58to battery60and/or to motor62via a respective electrical connection that is easy and economical to realize. For example, a first high-voltage line64acan run inside housing52from battery60to inverting device58. Correspondingly, a second high-voltage line64b, also situated in the housing, can electrically connect inverting device58to motor62. In this case, housing52additionally ensures a shielding of high-voltage lines64aand64b.

In addition to inverting device58, electronics apparatus50includes at least two circuit boards66through70situated inside housing52. In the depicted specific embodiment, electronics apparatus50has three circuit boards66through70. However, the realizability of electronics device50described here is not limited to a particular number of circuit boards66through70. A circuit board66through70is here to be understood also as a PCB unit (Printed Circuit Board), a circuit card, a printed circuit, a hybrid, and/or a corresponding unit as bearer for at least one electrical component. The term used hereinafter, “circuit board66through70,” includes all the specific embodiments here enumerated. Generally, such a circuit board66through70is made up of an electrically insulating material having conductive connections adhering thereto (conductor paths). Preferably, circuit board66through70realizes a multiple functionality for the mechanical fastening and/or electrical connection of the component fashioned thereon. Electronics apparatus50described here is not limited to a particular realization of a usable circuit board66through70, for example a particular insulating material or a particular circuit pattern of the conductor paths, or to the electrical component fashioned thereon. Because almost every electrical device will therefore include at least two such circuit boards66through70, the technology described hereinafter is applicable to a large number of electrical devices.

A first circuit board66is electrically connected to inverting device58via at least one line72. A second circuit board68, electrically connected to first circuit board66via a first galvanic connection74, is electrically connected to third circuit board70via a second galvanic connection76. Third circuit board70is electrically connected to an external contact80, situated on housing52, of electronics apparatus50, for example with a plug connector, via a third galvanic connection78. An external line82can for example be capable of being coupled to external contact80, by which line electronics apparatus50can be electrically connected to a further device (not shown). However, it is to be noted that electronics apparatus50is not limited to a third galvanic connection78that electrically connects third circuit board70to an external contact80. Instead of external contact80, third circuit board70can for example also be electrically connected, via third galvanic connection78, to another component, situated in housing52and/or on housing52, of electronics apparatus50.

First circuit board66can for example be situated in housing52in such a way that a border area84between high-voltage area54and low-voltage area56divides first circuit board66. Second circuit board68and third circuit board70can in this case be situated inside low-voltage area56. However, it is to be noted that electronics apparatus50is not limited to such a positioning of circuit boards66through70.

First circuit board66can be coupled mediately or immediately to inverting device58via line72. For example, first circuit board66can be electrically connected via line72to a further component of electronics apparatus50, which can for its part be electrically coupled mediately or immediately to inverting device58via a further line. However,FIG. 2does not show such an embodiment of electronics apparatus50.

Line72, via which first circuit board66is electrically connected to inverting device58, can for example be a cable, in particular a ribbon cable. However, such a design of line72is not required for the realization of electronics apparatus50.

The form of electronics apparatus50is not limited to the represented number of galvanic connections74through78. Instead, the number of galvanic connections74through78of electronics apparatus50can be equal to two, or at least equal to four. At least one of galvanic connections74through78can be an electrical connection. Preferably, at least one of galvanic connections74through78is a ribbon cable or is fashioned as a ribbon cable. In an advantageous specific embodiment of electronics apparatus50, first galvanic connection74has a first ribbon cable, second galvanic connection76has a second ribbon cable, and third galvanic connection78has a third ribbon cable. A length of the at least one ribbon cable can be in a range of from 5 through 50 cm, preferably from 10 through 30, in particular from 15 through 25. A width of the at least one ribbon cable can be in a range of from 3 through 12 cm, preferably 5 through 10 cm. Such low-cost ribbon cables can include a plurality of individual conductors, for example 42 individual conductors (42supply lines). The advantages of equipping electronics apparatus50with at least one galvanic connection74through78fashioned as a ribbon cable are discussed in more detail below. It is to be noted that despite the use of the schematic symbol for a plurality of conductors, line72and galvanic connections74through78are however not limited to being equipped with a cable that includes a plurality of conductors.

Electronics apparatus50has a first filter86having a first discharge connection to housing52. First filter86is situated on first circuit board66. Moreover, first filter86is connected upstream from first galvanic connection74. Here, a connection of first filter86upstream from first galvanic connection74is preferably to be understood as meaning that first filter86is electrically coupled at the input side to at least one component situated on first circuit board66, and at the output side is electrically connected to first galvanic connection74. A flow of current between the at least one component situated on first circuit board66and first galvanic connection74thus takes place via first filter86.

On second circuit board68there is situated a second filter88having a second discharge line to housing52. Second filter88is situated downstream from first galvanic connection74. A connection of second filter88downstream from first galvanic connection74can preferably be understood as meaning that second filter88is electrically connected to first galvanic connection74at the input side and at the output side is electrically coupled to at least one component situated on second circuit board68. Preferably, a flow of current between first galvanic connection74and the at least one component situated on second circuit board68takes place via second filter88.

On second circuit board68there is also situated a third filter90having a third discharge connection to housing52. Third filter90is connected upstream from second galvanic connection76. In order to explain the connection of third filter90upstream from second galvanic connection76, reference is made to the above description of the connection of first filter86upstream from first galvanic connection74.

Preferably, on third circuit board70there is situated a fourth filter92having a fourth discharge connection to housing52and/or a fifth filter94having a fifth discharge connection to housing52. In a preferred specific embodiment of electronics device50, fourth filter92is connected downstream from second galvanic connection76and/or fifth filter94is connected upstream from third galvanic connection78. For the explanation of the terms “upstream” and “downstream,” see above.

At least one of the at least three filters86through94can be situated on a connecting plug of upstream or downstream galvanic connection74through78on allocated circuit board66through70. Such a situation of at least one filter86through94can be realized at low expense and ensures a reliable filtering out of interference signals. This configuration of filters86through94can also be described as situation on the plug connectors of circuit boards66through70.

First filter86, second filter88, third filter90, fourth filter92, and/or fifth filter94can be fashioned as T filters. A T filter is to be understood as a filter whose circuit topology looks like the letter T. As a rule, in the signal line of such a T filter there is situated (looped in) at least one component such as a resistor, a capacitor, an inductor, and/or a more complex circuit, a tap (discharge connection) leading from a node point situated in the signal line to housing52, in which tap there is situated a capacitor or a corresponding component (a more complex circuit). A T-filter that is usable for filters86through94can for example be fashioned as a T-low-pass element having two resistors in the signal line and having a capacitor in the discharge connection to housing52, as a T-low-pass element having two inductors in the signal line and having a capacitor in the discharge connection to housing52, and/or as a T-high-pass element having two capacitors in the signal line and having a resistor in the discharge connection to housing52. However, the construction of filters86through94is not limited to a T filter, in particular a T-low-pass element or a T-high-pass element.

The at least three filters86through94can also be designated SMD (Service Mounted Device) components, due to the capacitor present in each case in the discharge connection to housing52. A low-cost and easy-to-install capacitor may be used for the SMD component that can be used for the at least three filters86through94, the circuit board of said capacitor having a ground connection to housing52. The discharge connection of a filter86through94is therefore easily achieved via a capacitor. In particular, filters86through94can reliably execute their function, described in more detail below, even if they have a comparatively small extension and/or light weight. Thus, the equipping of electronics apparatus50with the at least three filters86through94is not accompanied by a significant increase in weight of electronics apparatus50and/or a larger installation space requirement of electronics apparatus50.

The at least one T filter can, at a first end of the signal line, contact a component situated on allocated circuit board66through70. A second end of the signal line can open into the upstream or downstream galvanic connection74through78. Such a configuration of the at least one T filter ensures a particularly good filtering out of interference signals.

In a development of depicted electronics apparatus50, it is also possible for at least one fourth circuit board to be equipped with preferably three such filters. For example, a sixth filter can be connected downstream from third galvanic connection78, while a seventh filter is connected upstream from a further galvanic connection. Corresponding to the above-described filters86through94, the sixth and seventh filter can each have a discharge connection to housing52. Because the low-cost, light, and/or space-saving specific embodiments already enumerated above are usable for the sixth filter and/or for the seventh filter, an additional development of electronics apparatus50with at least two additional filters is not associated with significantly increased production costs, a significant increase in weight, and/or a larger installation space requirement. The filter design depicted on the basis ofFIG. 2and explained in more detail below using filters86through94is thus expandable to a larger number of filters. The advantages of electronics apparatus50described here result due to the fact that, due to the “in-series connection” at least of first filter86, second filter88, and third filter90in the manner described above, it is possible to filter out high-frequency interferences in a targeted manner, i.e., to discharge them via housing52. This filtering using at least the three filters86through90does not adversely affect, or does so only to a small extent, the forwarding of useful signals via galvanic connections74through78. Thus, the depicted filter configuration having at least filters86through90offers a reliable, low-cost, low-weight, space-saving filtering that is directed in a targeted manner to high-frequency interference signals. In this way, an interference suppression design of electronics apparatus50including a multistage broadband frequency filter design is realizable in such a way that electromagnetic interferences, such as those that may arise for example due to parasitic capacitances in the machine winding, can be discharged via housing52. Exiting or straying of such electromagnetic interferences to the surrounding environment is thus reliably prevented.

The interference suppression design realized using at least filters86through90offers an advantageous alternative to the conventional equipping of electronics apparatus50with filter blocks. Because such filter assemblies require a comparatively large amount of space and have high production costs, using at least filters86through90the costs and/or installation space requirement for electronics apparatus50can be reduced. In addition, the interference suppression outlay/development expense of the higher-order filter blocks used in a conventional manner is very high and can only be realized using simulation tools and a large amount of measurement technology. This disadvantage is also circumvented by the interference suppression design according to the present invention.

Because in particular it is no longer necessary to situate filter blocks in the area of the electrical connections between battery60and inverting device58and between inverting device58and engine62, electronics apparatus50can easily be fashioned as an assembly having a closed (expanded) housing52including shielded/closed high-voltage area54with high-voltage lines shielded at the periphery, and having a low-voltage area56. The interference suppression design using at least filters86through90thus also enlarges the degrees of freedom in the realization of electronics apparatus50. In addition, in contrast to the conventional filter blocks, which do not ensure shielding inside housing52, an additional shielding effect of individual components of electronics apparatus50can be realized.

First galvanic connection74and/or second galvanic connection76here act as an inductor for the undesired high-frequency interference signals. This ensures a targeted filtering out of the high-frequency interference signals, while at the same time the useful signals that are to be forwarded via galvanic connections74through78are not adversely affected, or are only slightly adversely affected. The “in-series connection” of the depicted filters86through94can also be described as the working together of first filter86, first galvanic connection74, and second filter88as a first pi filter (n filter) and/or the working together of third filter90, second galvanic connection76, and fourth filter92as a second pi filter (πfilter).

The advantageous multifunctionality of at least one of galvanic connections74through78is in particular ensured as long as the respective galvanic connection74through78includes a ribbon cable. Here, a length of the ribbon cable of from 5 through 50 cm, preferably 10 through 30 cm, preferably 15 through 25 cm is particularly advantageous. Correspondingly, the use of at least one ribbon cable having a width of from 3 through 12 cm, advantageously 5 through 10 cm, can also ensure the desired multifunctionality of the respective galvanic connection74through78. In a preferred specific embodiment of electronics apparatus50, galvanic connections74through78include ribbon cables having a length of 20 cm and a width of 7 cm. This ensures the above-described targeted filtering out of high-frequency interferences over a frequency range that reliably covers the usually occurring high-frequency interferences.

Supplementing the at least three filters86through90, electronics apparatus50can also include at least one plate-type shielding unit96or98that is made at least partly of a conductive material such as metal and/or a doped semiconductor material. The at least one plate-type shielding unit96and/or98is in this case connected electrically to an associated discharge connection of the respective filter86through94adjacent which it is situated, and to housing52. A suitable plate-type shielding unit96and98can for example be a shielding plate and/or a formed part of the housing.

Depicted electronics apparatus50includes for example a first plate-type shielding unit96that is electrically connected to the discharge connection of second filter88and a second plate-type shielding unit98that is electrically connected to the discharge connection of fourth filter92.

It is to be noted that electronics apparatus50described here is not limited to being equipped with a particular number of shielding units96and98and/or to an electric coupling of the at least one shielding unit96or98to a discharge connection of a particular filter86through94. Thus, in the production of electronics apparatus50an advantageous freedom of variation is ensured with regard to the attachment of the at least one shielding unit96and/or98. The depicted filter design is thus capable of being combined with a shielding having at least one plate-type shielding unit96and/or98. For example, in addition to the interference suppression design using filters86through94, a shielding via shielding units96and98fashioned as shielding plates can also be realized in such a way that individual circuit boards66through70are shielded from one another. An advantageous quality of this filtering can be increased by a multi-stage construction.

In an advantageous specific embodiment of electronics apparatus50, an inverter controlling can be fashioned on first circuit board66, a control electronics can be fashioned on second circuit board68, and/or a plug electronics can be fashioned on third circuit board70. The inverter controlling, which can also be designated a gate driver, is preferably half situated in high-voltage area54and half in low-voltage area56. In this way, using filters86through94a multistage filter configuration is fashioned having a first filter stage at the output of the gate driver, a second filter stage at the input of the control electronics, having a third filter stage at the output of the control electronics, having a fourth filter stage at the input of the plug electronics, and having a fifth filter stage at the output of the plug electronics. Electronics apparatus50described here is however not limited to such a construction.

A further advantage of filters86through90, or through94, is that the filtering can be carried out not in high-voltage area54but rather in low-voltage area56, so that electronics apparatus50can be produced at lower cost and has a better performance spectrum (e.g., an improved temperature resistance). For example, using filters86through90or94described here, the use of Y capacitors, which as a rule do not ensure reliable functioning outside a comparatively narrow temperature range, can be done without. Thus, electronics apparatus50described here, producible at low cost, can be reliably operated even at extreme temperatures.

Electronics apparatus50described in the foregoing can be fashioned as a power electronics system. In particular, electronics apparatus50can be fashioned as a pulse inverter, a hybrid engine, or as a DC/DC converter. However, it is to be noted that the applicability of the filter design described in the foregoing having at least filters86through90is not limited to an electronics apparatus50fashioned in this way.

In addition to the filters86through90and plate-type shielding units96and98, shown schematically inFIG. 2, electronics apparatus50can include further filter components such as for example at least one of the filter components depicted inFIG. 1, and/or at least one Y capacitor. However, further depiction of such a filter component is not provided inFIG. 2, in order to illustrate that the interference suppression design of filters86through90is sufficient for reliable protection from interference signals.

FIG. 3shows a flow diagram representing a specific embodiment of an example method for producing an example electronics apparatus.

In a method step S1of the example production method, an inverting device, a first circuit board, and a second circuit board are situated in a housing that is fashioned at least partly of a conductive material. However, it is to be noted that the electronics apparatus that is to be produced is not limited to a number of exactly 2 circuit boards. Thus, it is also possible to situate more than two circuit boards in the housing together with the inverting device. Optionally, it is also possible to situate at least one further component of the electronics device in the housing and/or on the housing.

In a method step S2, the inverting device is electrically connected to the first circuit board via at least one line. In particular, the inverting device can be connected to the first circuit board via a high-voltage line.

In a method step S3, a first galvanic connection between the first circuit board and the second circuit board is fashioned in such a way that the first circuit board is electrically connected to the second circuit board via the first galvanic connection. Correspondingly, in a method step S4the second circuit board is electrically connected via a second galvanic connection to at least one component, situated in the housing and/or on the housing, of electronics apparatus50. Preferably, in at least one of the method steps S3or S4a ribbon cable having a length of from 5 through 50 cm, preferably 10 through 30 cm, in particular 15 through 25 cm, and having a width of from 3 through 12 cm, preferably 5 through 10 cm, is positioned between the first circuit board and the second circuit board and/or between the second circuit board and the at least one component. Correspondingly, in at least one further method step at least one further ribbon cable can be positioned between two further circuit boards of electronics apparatus50.

In addition, in a method step S5a first filter situated on the first circuit board is fashioned having a first discharge connection to the housing, the first filter being connected upstream from the first galvanic connection. Correspondingly, in a method step S6a second filter having a second discharge connection is situated on the second circuit board. Here, the second filter is fashioned such that the second filter is situated downstream from the first galvanic connection. In addition, in a method step S7a third filter is fashioned in such a way that it is situated on the second circuit board with a third discharge connection to the housing, and is situated upstream from the second galvanic connection. The carrying out of method steps S5through S7ensures the above-described advantages.

However, the production method described here is not limited to an equipping of the electronics apparatus with only three such filters. As an addition to the production method indicated here, further filters may correspondingly be fashioned on at least one additional circuit board.

In a development of the described production method, at least one plate-type shielding unit can be situated in the housing of the electronics apparatus, the shielding unit, fashioned at least partly from a conductive material, being electrically connected to an allocated discharge connection of the filter situated adjacent, and to the housing.

The practicability of the example production method described here is not limited to a temporal sequence of method steps S1through S7corresponding to their numbering.