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WO2018137764A1 - Converter circuit for a two-voltage motor vehicle network, two-voltage motor vehicle network and motor vehicle - Google Patents

Converter circuit for a two-voltage motor vehicle network, two-voltage motor vehicle network and motor vehicle Download PDF

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Publication number
WO2018137764A1
WO2018137764A1 PCT/EP2017/051649 EP2017051649W WO2018137764A1 WO 2018137764 A1 WO2018137764 A1 WO 2018137764A1 EP 2017051649 W EP2017051649 W EP 2017051649W WO 2018137764 A1 WO2018137764 A1 WO 2018137764A1
Authority
WO
WIPO (PCT)
Prior art keywords
motor vehicle
network
voltage
converter circuit
pin
Prior art date
Application number
PCT/EP2017/051649
Other languages
French (fr)
Inventor
Florian Weigt
Original Assignee
HELLA GmbH & Co. KGaA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by HELLA GmbH & Co. KGaA filed Critical HELLA GmbH & Co. KGaA
Priority to PCT/EP2017/051649 priority Critical patent/WO2018137764A1/en
Publication of WO2018137764A1 publication Critical patent/WO2018137764A1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/10—Current supply arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2200/00—Type of vehicles
    • B60L2200/36—Vehicles designed to transport cargo, e.g. trucks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2210/00—Converter types
    • B60L2210/10—DC to DC converters
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
    • H03K19/0175—Coupling arrangements; Interface arrangements
    • H03K19/0185—Coupling arrangements; Interface arrangements using field effect transistors only
    • H03K19/018507—Interface arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L2012/40208—Bus networks characterized by the use of a particular bus standard
    • H04L2012/40234—Local Interconnect Network LIN
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L2012/40267—Bus for use in transportation systems
    • H04L2012/40273—Bus for use in transportation systems the transportation system being a vehicle
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/16—Information or communication technologies improving the operation of electric vehicles

Definitions

  • the present invention relates to a converter circuit for a two-voltage motor vehicle network of a motor vehicle according to the preamble of claim 1 , a two-voltage motor vehicle network according to the preamble of claim 6 and a motor vehicle with a two- voltage motor vehicle network according to the preamble of claim 8.
  • Such converter circuits for two-voltage motor vehicle networks of a motor vehicle, two- voltage motor vehicle networks and motor vehicles are already known in different embodiments.
  • a converter circuit designed and configured as a bidirectional level shifter and said pin BUS1 for the first communication network is electrically conductive connected to said pin V1 for the first power supply network by means of a first pull-up resistor and said pin BUS2 for the second communication network is electrically conductive connected to said pin V2 for the second power supply network by means of a second pull-up resistor.
  • a main advantage of the converter circuit according to the invention is, that it is possible to use at least one electrical load in the two-voltage motor vehicle network of a motor vehicle which is designed and configured to communicate with a second communication network using at least one second operating voltage level, which in particular depends on a second DC supply voltage of a second power supply network.
  • the bidirectional level shifting of the operating voltage level allows for communication in both directions, from said first communication network to said second communication network linked to the at least one electrical load and from said second communication network to the said first communication network linked to at least one control unit of the motor vehicle.
  • the level shifter can be of any design and function.
  • said level shifter comprises a semiconductor switch, in particular a MOS-FET.
  • Semiconductor switches are of small size and allow for a compact design. Especially MOS-FET semiconductor switches are favorable. MOS-FET's are cheap and available in a lot of designs.
  • said level shifter has a protective diode, which is connected to said semiconductor switch in such a way, that said semiconductor switch is protected against overvoltage. Therefore, in certain circumstances no further safeguard is needed.
  • MOS-FET's comprising a substrate diode by default, because of their design. Thus, by employing at least one MOS-FET the converter circuit could be even less complex.
  • a further advantageous development of the inventive converter circuit is, that said level shifter is designed and configured to be electrically conductive connected to said first and/or said second communication network, whereat said first and/or said second communication network are/is designed as a single-wire communication network, in particular a single-wire bus system. That way, the converter circuit is realized with less wires and less wiring.
  • a particular preferable development of the inventive converter circuit is, that said converter circuit is designed as a structural unit. Hereby, the handling and the application of the converter circuit is simplified.
  • Further objects of the invention are to provide a two-voltage motor vehicle network for a motor vehicle and a motor vehicle.
  • a two-voltage motor vehicle network for a motor vehicle according to claim 6 and a motor vehicle, comprising a two-voltage motor vehicle network, according to claim 8.
  • An advantageous development of the inventive two-voltage motor vehicle network is, that said first and/or said second communication network are/is designed as a single- wire communication network, in particular a single-wire bus system. That means, that the two-voltage motor vehicle network can be realized with less wires and less wiring.
  • Fig. 1 an embodiment of a two-voltage motor vehicle network according to the invention
  • Fig. 2 the converter circuit used in the two-voltage motor vehicle network of Fig.
  • Fig. 1 displays an embodiment of a two-voltage motor vehicle network 2 of a motor vehicle, which is not displayed.
  • the two-voltage motor vehicle network 2 comprises a first power supply network 4 of a first DC supply voltage, namely 24 V, and a second power supply network 6 of a second DC supply voltage, namely 12 V.
  • said two-voltage motor vehicle network 2 comprises a first communication network 8 with two first operating voltage levels and a second communication network 10 with two second operating voltage levels, whereat the first operating voltage levels depend on the first DC supply voltage of the first power supply network 4 and the second operating voltage levels depend on the second DC supply voltage of the second power supply network 6.
  • Said first and said second communication networks 8, 10 are LIN buses. Therefore, the two first operating voltage levels are 0.3 x 24 V and 0.7 x 24 V, namely 7.2 V and 1 6.8 V and the two second operating voltage levels are 0.3 x 12 V and 0.7 x 12 V, namely 3.6 V and 8.4 V.
  • the first and the second communication networks 8, 10 are each designed as a single-wire communication network 8, 10, namely a single-wire bus system 8, 10.
  • Multiple electrical loads G1 to GN are connected to the second power supply network 6 in a power- transmitting manner.
  • the electrical loads G1 to GN are provided with electrical power via the second power supply network 6.
  • the electrical loads G1 to GN are connected to the second communication network 10 in a signal-transmitting manner.
  • the electrical loads G1 to GN are sending and receiving electrical signals via the second communication network 10.
  • Each of the multiple electrical loads G1 to GN is designed and configured for use in a 12 V power supply network and the electrical signals send from and received from each of the multiple electrical loads G1 to GN refer to said DC supply voltage of 12 V.
  • the DC supply voltage, the power supply voltage, and the operating voltage levels, the communication voltage levels, of each of the electrical loads G1 to GN are based on a 12 V power supply network.
  • the electrical signals send from and received from each of the multiple electrical loads G1 to GN are exchanged with a control unit of the motor vehicle, which is not displayed.
  • Said control unit is electrically conductive connected to the first power supply network 4 in a power-transmitting manner and to the first communication network 8 in a signal-transmitting manner.
  • the first and the second power supply networks 4, 6 are in a power-transmitting connection via a converter circuit unit 12 and the first and the second communication networks 8, 10 are in a signal-transmitting connection via the converter circuit unit 12.
  • the converter circuit unit 12 comprises the converter circuit 14, which is displayed in detail in Fig. 2.
  • the converter circuit 14 is designed as a structural unit 12. All components of the converter circuit 14 are part of said converter circuit unit 12. Therefore, it is possible to manufacture the converter circuit unit 12 with the converter circuit 14 separately, for example by a supplier.
  • Fig. 2 displays the converter circuit 14 of said converter circuit unit 12 used in the two- voltage motor vehicle network 2 of Fig. 1 .
  • the converter circuit 14 comprises for each of the above mentioned networks 4, 6, 8 and 10 a pin structure. The pins are labelled in Fig.
  • the networks 4, 6, 8 and 10 can each be electrically conductive connected to the converter circuit 14 via the pins V1 , V2, BUS1 and BUS2, namely the first power supply network 4 via pin V1 , the second power supply network 6 via pin V2, the first communication network 8 via pin BUS1 and the second communication network 10 via pin BUS2.
  • the pin V1 for the first power supply network 4 is electrically conductive connected with an input of a DC voltage converter 14.1 .
  • the DC voltage converter 14.1 converts the first DC supply voltage of the first power supply network 4, namely 24 V, to the second DC supply voltage of the second power supply network 6, namely 12 V.
  • the converter circuit 14 comprises a level shifter 14.2, too.
  • the pins for the first communication network 8 and the second communication network 10, labelled with BUS1 and BUS2, are electrically conductive connected to the level shifter 14.2.
  • the level shifter 14.2 of the converter circuit 14 comprises a semiconductor switch 14.2.1 , namely a MOS-FET 14.2.1 , and a diode D1 , which is functioning as a protective diode, protecting the MOS-FET 14.2.1 from overvoltage.
  • the MOS-FET 14.2.1 is also labelled as T1 in Fig. 2.
  • the gate of the MOS-FET 14.2.1 , the protective diode D1 and a resistor R2 are electrically connected in parallel. Both, the protective diode D1 and the resistor R2 are electrically connecting the pin V2 of the converter circuit 14 for the second power supply network 6 with the pin BUS2 for the second communication network 10.
  • the pin BUS1 of the converter circuit 14 for the first communication network 8 is connected via a pull-up resistor R1 with the pin V1 of the converter circuit 14 for the first power supply network 4.
  • the pin BUS2 of the converter circuit 14 for the second communication network 10 is connected via a pull- up resistor R3 with the pin V2 of the converter circuit 14 for the second power supply network 6.
  • the level shifter 14.2 comprising the MOS-FET 14.2.1 , the protective diode D1 , the resistor R2 as well as the two pull-up resistors R1 and R3.
  • the first DC supply voltage of 24 V of the first supply voltage network 4 is transformed to the second DC supply voltage of 12 V of the second supply voltage network 6 in order to supply each of the multiple electrical loads G1 to GN of the two-voltage motor vehicle network with the supply voltage needed for a proper function.
  • the first and second operating voltage levels used in the communication networks 8 and 10 have to be converted in both directions of communication, too. This is achieved by the level shifter 14.2 as described as follows:
  • the source of the MOS-FET 14.2.1 is on ground.
  • the gate-source voltage is positive, the MOS-FET 14.2.1 switches, the pin BUS1 for the first communication network 8 becomes a low level like the pin BUS2, namely 0 V, too.
  • the source of the MOS-FET 14.2.1 is on the same electrical potential like the gate of the MOS-FET 14.2.1 .
  • the MOS-FET 14.2.1 blocks.
  • the pin BUS1 for the first communication network 8 becomes a high level like the pin BUS2, namely 24 V, because of the pull-up resistor R1 .
  • the source of the MOS-FET 14.2.1 becomes 12V because of the pull-up resistor R3.
  • source and gate are on the same electrical potential and the MOS-FET 14.2.1 blocks again.
  • the pin BUS2 for the second communication network 10 becomes a high level like the pin BUS1 , because of the pull-up resistor R3, namely 12 V.
  • the MOS-FET 14.2.1 blocks, too.
  • a substrate diode of the MOS-FET 14.2.1 which is an internal part of the MOS-FET 14.2.1 , starts to electrically conduct.
  • the pin BUS2 is finally grounded and becomes a low level like the pin BUS1 , namely 0 V.
  • the substrate diode of the MOS-FET 14.2.1 is not displayed.
  • the invention is not limited to the exemplary embodiment discussed.
  • the bidirectional level shifter is not limited to semiconductor switches, like MOS-FET's. All known and suitable kinds of bidirectional level shifters are possible. For example, for each direction of communication a separate wire and a separate switch can be used in order to build the bidirectional level shifter.
  • any other available and suitable protective element can be used.
  • the pull-up resistors and the MOS-FET or any other known and suitable switch of the level shifter do not have to be part of a single structural unit. It is sufficient, if the parts of the converter circuit according to the invention are in a common electrical circuit.
  • the first and second communication networks each being a LIN bus other known and suitable communication networks are possible, too.
  • the first and the second communication networks do not have to be of the same type.
  • the first power supply network and the first com- munication network can be electrically conductive connected to more than one control unit and to other electrical units, too.
  • the pull-up resistor R3 can take over the function of the resistor R2, too.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The invention relates to a converter circuit (14) for a two-voltage motor vehicle net- work (2), comprising a DC voltage converter (14.1) and a level shifter (14.2). In order to provide a converter circuit (14) for a two-voltage motor vehicle network (2) of a motor vehicle of a simple electrical design, said level shifter (14.2) is designed and configured as a bidirectional level shifter (14.2) and said pin BUS1 for the first communication network (8) is electrically conductive connected to said pin V1 for the first power supply network (4) by means of a first pull-up resistor R1 and said pin BUS2 for the second communication network (10) is electrically conductive connected to said pin V2 for the second power supply network (6) by means of a second pull-up resistor R3. The invention relates further to a two-voltage motor vehicle network (2) of a motor vehicle and a motor vehicle.

Description

Converter circuit for a two-voltage motor vehicle network,
two-voltage motor vehicle network and motor vehicle
Description
The present invention relates to a converter circuit for a two-voltage motor vehicle network of a motor vehicle according to the preamble of claim 1 , a two-voltage motor vehicle network according to the preamble of claim 6 and a motor vehicle with a two- voltage motor vehicle network according to the preamble of claim 8.
Such converter circuits for two-voltage motor vehicle networks of a motor vehicle, two- voltage motor vehicle networks and motor vehicles are already known in different embodiments.
From the US 7,929,267 B2, also published as DE 10 2004 014 662 A1 , a system comprising an automotive fuse and an A/D converter is known. The known system digitizes the measured signal value and conditions in such, that it can be sent by way of a data bus for further processing. Said two-wire data bus supplies said system with the required voltage. On said data bus there is a level converter and a power supply which in turn supplies said data bus with power and which converts the digitized signals resulting from the determined measured values and sends them to a master unit. See also Fig. 1 of the US 7,929,267 B2.
It is an object of the invention to provide a converter circuit for a two-voltage motor vehicle network of a motor vehicle of a simple electrical design.
This object is solved by a converter circuit according to claim 1 , wherein said level shifter is designed and configured as a bidirectional level shifter and said pin BUS1 for the first communication network is electrically conductive connected to said pin V1 for the first power supply network by means of a first pull-up resistor and said pin BUS2 for the second communication network is electrically conductive connected to said pin V2 for the second power supply network by means of a second pull-up resistor. A main advantage of the converter circuit according to the invention is, that it is possible to use at least one electrical load in the two-voltage motor vehicle network of a motor vehicle which is designed and configured to communicate with a second communication network using at least one second operating voltage level, which in particular depends on a second DC supply voltage of a second power supply network. This can be achieved by the invention applying a simple electrical converter circuit. Thus, electrical loads developed for the use in a second power supply network of a second DC supply voltage and integrated in a second communication network using at least one second operating voltage level referring to said second DC supply voltage of said second power supply network can be used more easily in two-voltage motor vehicle networks comprising a first power supply network of a first DC supply voltage, a second power supply network of a second DC supply voltage which is lower than said first DC supply voltage and further comprising a first communication network with at least one first operating voltage level, which in particular depends on a first DC supply voltage, and a second communication network with at least one second operating voltage level, which in particular depends on a second DC supply voltage.
No modifications of the at least one electrical load are necessary. Furthermore, the bidirectional level shifting of the operating voltage level allows for communication in both directions, from said first communication network to said second communication network linked to the at least one electrical load and from said second communication network to the said first communication network linked to at least one control unit of the motor vehicle.
Further advantageous developments of the inventive converter circuit, the inventive two-voltage motor vehicle network and the inventive motor vehicle are apparent from the sub-claims as well as from the following description of an exemplary embodiment of the converter circuit, the two-voltage motor vehicle network and the motor vehicle according to the invention by means of the attached Figures. In general, the level shifter can be of any design and function. Favorably, said level shifter comprises a semiconductor switch, in particular a MOS-FET. Semiconductor switches are of small size and allow for a compact design. Especially MOS-FET semiconductor switches are favorable. MOS-FET's are cheap and available in a lot of designs.
An advantageous development of the aforementioned embodiment is, that said level shifter has a protective diode, which is connected to said semiconductor switch in such a way, that said semiconductor switch is protected against overvoltage. Therefore, in certain circumstances no further safeguard is needed. MOS-FET's comprising a substrate diode by default, because of their design. Thus, by employing at least one MOS-FET the converter circuit could be even less complex.
A further advantageous development of the inventive converter circuit is, that said level shifter is designed and configured to be electrically conductive connected to said first and/or said second communication network, whereat said first and/or said second communication network are/is designed as a single-wire communication network, in particular a single-wire bus system. That way, the converter circuit is realized with less wires and less wiring.
A particular preferable development of the inventive converter circuit is, that said converter circuit is designed as a structural unit. Hereby, the handling and the application of the converter circuit is simplified.
Further objects of the invention are to provide a two-voltage motor vehicle network for a motor vehicle and a motor vehicle.
These objects are solved by a two-voltage motor vehicle network for a motor vehicle according to claim 6 and a motor vehicle, comprising a two-voltage motor vehicle network, according to claim 8. An advantageous development of the inventive two-voltage motor vehicle network is, that said first and/or said second communication network are/is designed as a single- wire communication network, in particular a single-wire bus system. That means, that the two-voltage motor vehicle network can be realized with less wires and less wiring.
The Figures are schematic illustrations of the invention, wherein only the details necessary for the understanding of the invention are shown. Parts with the same function are marked by the same reference number.
It is shown by:
Fig. 1 an embodiment of a two-voltage motor vehicle network according to the invention and
Fig. 2 the converter circuit used in the two-voltage motor vehicle network of Fig.
1 in detail.
Fig. 1 displays an embodiment of a two-voltage motor vehicle network 2 of a motor vehicle, which is not displayed. The two-voltage motor vehicle network 2 comprises a first power supply network 4 of a first DC supply voltage, namely 24 V, and a second power supply network 6 of a second DC supply voltage, namely 12 V. Furthermore, said two-voltage motor vehicle network 2 comprises a first communication network 8 with two first operating voltage levels and a second communication network 10 with two second operating voltage levels, whereat the first operating voltage levels depend on the first DC supply voltage of the first power supply network 4 and the second operating voltage levels depend on the second DC supply voltage of the second power supply network 6.
Said first and said second communication networks 8, 10 are LIN buses. Therefore, the two first operating voltage levels are 0.3 x 24 V and 0.7 x 24 V, namely 7.2 V and 1 6.8 V and the two second operating voltage levels are 0.3 x 12 V and 0.7 x 12 V, namely 3.6 V and 8.4 V. The first and the second communication networks 8, 10 are each designed as a single-wire communication network 8, 10, namely a single-wire bus system 8, 10.
Multiple electrical loads G1 to GN, like an actuator of a grill-shutter or other actuators and sensors, are connected to the second power supply network 6 in a power- transmitting manner. The electrical loads G1 to GN are provided with electrical power via the second power supply network 6. Moreover, the electrical loads G1 to GN are connected to the second communication network 10 in a signal-transmitting manner. Thus, the electrical loads G1 to GN are sending and receiving electrical signals via the second communication network 10.
Each of the multiple electrical loads G1 to GN is designed and configured for use in a 12 V power supply network and the electrical signals send from and received from each of the multiple electrical loads G1 to GN refer to said DC supply voltage of 12 V. Thus, the DC supply voltage, the power supply voltage, and the operating voltage levels, the communication voltage levels, of each of the electrical loads G1 to GN are based on a 12 V power supply network. The electrical signals send from and received from each of the multiple electrical loads G1 to GN are exchanged with a control unit of the motor vehicle, which is not displayed. Said control unit is electrically conductive connected to the first power supply network 4 in a power-transmitting manner and to the first communication network 8 in a signal-transmitting manner.
The first and the second power supply networks 4, 6 are in a power-transmitting connection via a converter circuit unit 12 and the first and the second communication networks 8, 10 are in a signal-transmitting connection via the converter circuit unit 12. The converter circuit unit 12 comprises the converter circuit 14, which is displayed in detail in Fig. 2. Thus, the converter circuit 14 is designed as a structural unit 12. All components of the converter circuit 14 are part of said converter circuit unit 12. Therefore, it is possible to manufacture the converter circuit unit 12 with the converter circuit 14 separately, for example by a supplier. Fig. 2 displays the converter circuit 14 of said converter circuit unit 12 used in the two- voltage motor vehicle network 2 of Fig. 1 . The converter circuit 14 comprises for each of the above mentioned networks 4, 6, 8 and 10 a pin structure. The pins are labelled in Fig. 2 with the same abbreviations used in Fig. 1 . Thus, the networks 4, 6, 8 and 10 can each be electrically conductive connected to the converter circuit 14 via the pins V1 , V2, BUS1 and BUS2, namely the first power supply network 4 via pin V1 , the second power supply network 6 via pin V2, the first communication network 8 via pin BUS1 and the second communication network 10 via pin BUS2.
The pin V1 for the first power supply network 4 is electrically conductive connected with an input of a DC voltage converter 14.1 . The same is true for pin V2 for the second power supply network 6. The DC voltage converter 14.1 converts the first DC supply voltage of the first power supply network 4, namely 24 V, to the second DC supply voltage of the second power supply network 6, namely 12 V.
Furthermore, the converter circuit 14 comprises a level shifter 14.2, too. The pins for the first communication network 8 and the second communication network 10, labelled with BUS1 and BUS2, are electrically conductive connected to the level shifter 14.2. The level shifter 14.2 of the converter circuit 14 comprises a semiconductor switch 14.2.1 , namely a MOS-FET 14.2.1 , and a diode D1 , which is functioning as a protective diode, protecting the MOS-FET 14.2.1 from overvoltage.
The MOS-FET 14.2.1 is also labelled as T1 in Fig. 2. The gate of the MOS-FET 14.2.1 , the protective diode D1 and a resistor R2 are electrically connected in parallel. Both, the protective diode D1 and the resistor R2 are electrically connecting the pin V2 of the converter circuit 14 for the second power supply network 6 with the pin BUS2 for the second communication network 10.
On the high voltage side of the converter circuit 14, the pin BUS1 of the converter circuit 14 for the first communication network 8 is connected via a pull-up resistor R1 with the pin V1 of the converter circuit 14 for the first power supply network 4. The same is true for the low voltage side of the converter circuit 14. The pin BUS2 of the converter circuit 14 for the second communication network 10 is connected via a pull- up resistor R3 with the pin V2 of the converter circuit 14 for the second power supply network 6. The level shifter 14.2 comprising the MOS-FET 14.2.1 , the protective diode D1 , the resistor R2 as well as the two pull-up resistors R1 and R3.
In the following, the function of the above explained embodiment of the invention is described by means of Fig. 1 and 2.
The first DC supply voltage of 24 V of the first supply voltage network 4 is transformed to the second DC supply voltage of 12 V of the second supply voltage network 6 in order to supply each of the multiple electrical loads G1 to GN of the two-voltage motor vehicle network with the supply voltage needed for a proper function.
The first and second operating voltage levels used in the communication networks 8 and 10 have to be converted in both directions of communication, too. This is achieved by the level shifter 14.2 as described as follows:
For example, if there is a low level at the pin BUS2 for the second communication network 10, namely 0 V, the source of the MOS-FET 14.2.1 is on ground. Thus, the gate-source voltage is positive, the MOS-FET 14.2.1 switches, the pin BUS1 for the first communication network 8 becomes a low level like the pin BUS2, namely 0 V, too.
If there is a high level at the pin BUS2 for the second communication network 10, namely 12 V, the source of the MOS-FET 14.2.1 . is on the same electrical potential like the gate of the MOS-FET 14.2.1 . The MOS-FET 14.2.1 blocks. Thus, the pin BUS1 for the first communication network 8 becomes a high level like the pin BUS2, namely 24 V, because of the pull-up resistor R1 .
If there is a high level at the pin BUS1 for the first communication network 8, namely 24 V, the source of the MOS-FET 14.2.1 becomes 12V because of the pull-up resistor R3. Thus, source and gate are on the same electrical potential and the MOS-FET 14.2.1 blocks again. The pin BUS2 for the second communication network 10 becomes a high level like the pin BUS1 , because of the pull-up resistor R3, namely 12 V.
On the other hand, if there is a low level at the pin BUS1 for the first communication network 8, namely 0 V, the MOS-FET 14.2.1 blocks, too. A substrate diode of the MOS-FET 14.2.1 , which is an internal part of the MOS-FET 14.2.1 , starts to electrically conduct. Thus, after a while the pin BUS2 for the second communication network 10 is almost grounded and a gate-source voltage causes the MOS-FET 14.2.1 to switch. The pin BUS2 is finally grounded and becomes a low level like the pin BUS1 , namely 0 V. The substrate diode of the MOS-FET 14.2.1 is not displayed.
The invention is not limited to the exemplary embodiment discussed.
Of course, the bidirectional level shifter is not limited to semiconductor switches, like MOS-FET's. All known and suitable kinds of bidirectional level shifters are possible. For example, for each direction of communication a separate wire and a separate switch can be used in order to build the bidirectional level shifter.
Instead of a protective diode any other available and suitable protective element can be used.
Furthermore, the pull-up resistors and the MOS-FET or any other known and suitable switch of the level shifter do not have to be part of a single structural unit. It is sufficient, if the parts of the converter circuit according to the invention are in a common electrical circuit. Instead of the first and second communication networks each being a LIN bus other known and suitable communication networks are possible, too. Furthermore, the first and the second communication networks do not have to be of the same type.
In contrast to the aforementioned exemplary embodiment only a single electrical load could be used, too. The same is true for the other side of the two-voltage motor vehicle network, the high voltage side. The first power supply network and the first com- munication network can be electrically conductive connected to more than one control unit and to other electrical units, too.
Under certain conditions, the pull-up resistor R3 can take over the function of the resistor R2, too.
List of reference numbers
2 Two-voltage motor vehicle network
4 First power supply network
6 Second power supply network
8 First communication network
10 Second communication network
12 Converter circuit unit
14 Converter circuit
14.1 DC voltage converter of the converter circuit 14
14.2 Level shifter of the converter circuit 14
14.2.1 Semiconductor switch of the level shifter 14.2, designed as a MOS-FET

Claims

Converter circuit for a two-voltage motor vehicle network, two-voltage motor vehicle network and motor vehicle Claims
1 . Converter circuit (14) for a two-voltage motor vehicle network (2) of a motor vehicle, comprising a DC voltage converter (14.1 ) which is designed and configured to be connected to a first power supply network (4) of a first DC supply voltage via a pin V1 and to a second power supply network (6) of a second DC supply voltage, which is lower than said first DC supply voltage, via a pin V2, and further comprising a level shifter (14.2) which is designed and configured to be connected to a first communication network (8) with at least one first operating voltage level via a pin BUS1 and to be connected to a second communication network (10) with at least one second operating voltage level via a pin BUS2,
wherein
said level shifter (14.2) is designed and configured as a bidirectional level shifter (14.2) and said pin BUS1 for the first communication network (8) is electrically conductive connected to said pin V1 for the first power supply network (4) by means of a first pull-up resistor R1 and said pin BUS2 for the second communication network (10) is electrically conductive connected to said pin V2 for the second power supply network (6) by means of a second pull-up resistor R3.
2. Converter circuit (14) according to claim 1 ,
wherein
said level shifter (14.2) comprises a semiconductor switch (14.2.1 ), in particular a MOS-FET (14.2.1 ).
3. Converter circuit (14) according to claim 2,
wherein
said level shifter (14.2) has a protective diode D1 , which is connected to said semiconductor switch (14.2.1 ) in such a way that said semiconductor switch (14.2.1 ) is protected against overvoltage.
4. Converter circuit (14) according to one of the claims 1 to 3,
wherein
said level shifter (14.2) is designed and configured to be electrically conductive connected to said first and/or said second communication network (8, 10), whereat said first and/or said second communication network (8, 10) are/is designed as a single-wire communication network (8, 10), in particular a single-wire bus system (8, 10).
5. Converter circuit (14) according to one of the claims 1 to 4,
wherein
said converter circuit (14) is designed as a structural unit (12).
6. Two-voltage motor vehicle network (2) for a motor vehicle,
wherein
said two-voltage motor vehicle network (2) comprises a converter circuit (14) according to one of the claims 1 to 4.
7. Two-voltage motor vehicle network (2) according to claim 6,
wherein
said first and/or said second communication network (8, 10) are/is designed as a single-wire communication network (8, 10), in particular a single-wire bus system (8, 10).
8. Motor vehicle, comprising a two-voltage motor vehicle network (2),
wherein
said two-voltage motor vehicle network (2) is designed according to claim 6 or 7.
PCT/EP2017/051649 2017-01-26 2017-01-26 Converter circuit for a two-voltage motor vehicle network, two-voltage motor vehicle network and motor vehicle WO2018137764A1 (en)

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JP2023506636A (en) * 2019-12-18 2023-02-17 メルセデス・ベンツ グループ アクチェンゲゼルシャフト Protective devices for electrical DC networks, on-board electrical systems for vehicles, vehicles and DC charging stations
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