WO2020099206A1

WO2020099206A1 - Device and method for generating an alarm signal for a charging interface, and charging interface

Info

Publication number: WO2020099206A1
Application number: PCT/EP2019/080367
Authority: WO
Inventors: Martin Wanner
Original assignee: Robert Bosch Gmbh
Priority date: 2018-11-14
Filing date: 2019-11-06
Publication date: 2020-05-22
Also published as: DE102018219408A1

Abstract

The invention relates to generating an alarm signal when plugging in a charging plug, in particular when plugging a charging plug into an electric vehicle. For this purpose, a voltage change on a line of the charging connection, in particular a voltage change on a signal or control line of the charging connection, is detected. The detection preferably takes place by means of a differential amplifier or a microcontroller. After a voltage change, i. e. a falling or rising edge has been detected, an alarm signal having a predetermined pulse width is output.

Description

description

title

DEVICE AND METHOD FOR GENERATING A WAKE-UP SIGNAL FOR A CHARGING INTERFACE AND CHARGING INTERFACE

The present invention relates to an apparatus and a method for generating a wake-up signal, in particular for generating a wake-up signal when a charging plug is inserted. The present invention further relates to a charging interface for an electric vehicle.

State of the art

Fully or at least partially electrically powered vehicles have electric motors that are supplied with energy from an electrical energy source, for example a high-voltage battery. These batteries can be charged from an external energy source. For example, the battery of the electric vehicle can be connected to a charging point such as a public charging station by means of a suitable cable connection. A method for charging the battery of an electric vehicle is known, for example, from DE 10 2014 200 315 Al.

For the wired charging of the traction battery of an electric vehicle, a cable connection is established between the electric vehicle and the charging point. For this purpose, among other things, a plug of the charging cable is inserted into a corresponding socket on the electric vehicle. After the plug of the charging cable has been inserted into the vehicle, the traction battery can be charged in the vehicle. The charging process is monitored and regulated using a suitable control circuit. In order to keep the energy consumption of the electric vehicle as low as possible, the individual components of the electric vehicle may only be activated when their function is required. For charging the

Traction battery of an electric vehicle, for example, means that the control circuit for charging the traction battery only needs to be activated when the battery is to be charged. The individual components can be activated, for example, by means of a suitable wake-up signal.

Disclosure of the invention

The present invention provides an apparatus and a method for generating a wake-up signal, in particular a wake-up signal when a charging plug is inserted, and a charging interface for an electric vehicle with the features of the independent claims. Further embodiments are the subject of the dependent claims.

Accordingly, it is provided:

A device for generating a wake-up signal, in particular for generating a wake-up signal when a charging plug is inserted. The device comprises an input connection, a differential amplifier and a control circuit. The input connection is designed to be electrically coupled to a contact of the charging plug. The differential amplifier comprises a first input, a second input and an output. The first input of the differential amplifier is coupled to the input connection. The second input of the differential amplifier is predetermined

Voltage potential coupled. The output of the differential amplifier is coupled to the control circuit. The control circuit is designed to be a

Output alarm signal. The control circuit can output a wake-up signal with a predetermined pulse width. In particular, the control circuit is designed to output the wake-up signal when a voltage change occurs at the output connection of the differential amplifier. It is also provided:

A charging interface for an electric vehicle. The charging interface comprises a plug connection, in particular a socket for a charging plug, and a device according to the invention for generating a wake-up signal. The

The plug connection is designed to accommodate a charging plug. The input connection of the device for generating the wake-up signal is coupled to a contact of the plug connection. In particular, the

Input connection of the device for generating the wake-up signal can be coupled to a contact for a control line.

Finally, it is provided:

A method for generating a wake-up signal, in particular for generating a wake-up signal when a charging plug is inserted. The method comprises the steps of detecting an electrical signal at a contact of the charging plug, comparing the detected electrical signal from the charging plug with a predetermined voltage potential, the

Comparisons can be made using a differential amplifier. The method further comprises a step for outputting a voltage signal at an output of the differential amplifier. The output can take place as a function of a comparison of the detected electrical signal from the charging plug with the predetermined voltage potential. Finally, the method comprises a step for generating a wake-up signal, in particular a wake-up signal with a predetermined pulse width. The wake-up signal can then be generated when a voltage change occurs at the output connection of the differential amplifier.

Advantages of the invention

The present invention is based on the finding that for

Energy saving in an electric vehicle, components that are not actively required can be deactivated. In order to activate deactivated components if necessary, appropriate signaling, such as a wake-up signal or the like, is required. In particular, the control for the charging of an electrical energy store in the electric vehicle can be initiated by inserting a charging plug into the electric vehicle. For this purpose, an inexpensive and energy-efficient detection of the insertion of the charging plug into the electric vehicle is desirable.

The present invention is therefore based on the idea of taking this knowledge into account and of providing reliable and inexpensive detection of the insertion of a charging plug. For this purpose, the lowest possible energy requirement is particularly desirable for such a detection of the insertion of the charging plug.

In the context of the present invention, the term “charging plug” is understood to mean a connecting element of a plug connection which is provided at the end of a charging cable. This connecting element can be plugged into a corresponding element, e.g. a socket.

For example, the charging plug can be a plug connection that can be plugged into a charging socket of an electric vehicle. In particular, any known or possibly future plug connections are possible. In particular, plug connections in accordance with IEC 62196 (DIN EN 62196), Combined Charching Standard CHAdeMO, or similar are possible, for example. The other end of the charging cable can be fixed or connected to a charging station or the like via a further plug connection.

To detect a charging plug on the charging socket, a potential change is detected on at least one line of the charging plug. In particular, a change in potential can be detected on a control or signal line of the charging plug. Such a change in potential can be detected, for example, by a rising or falling edge, as occurs when the charging plug is plugged into the electric vehicle.

A can be used to detect a rising or falling edge

Voltage signal on a line of the charging connector with a predetermined, preferably fixed, voltage potential are compared. By detecting whether the voltage signal has exceeded or fallen below a rising or falling edge can thus be detected in the line of the charging plug in relation to the predetermined voltage potential. For example, the voltage signal on the line of the charging connector can be compared with the predetermined voltage potential by means of a differential amplifier, in particular an energy-efficient one

Operational amplifier or the like. In this way, the insertion of the charging plug into the electric vehicle can be detected in a particularly energy-efficient manner, that is to say by means of very low power consumption.

The output signal of the differential amplifier can then be evaluated by means of a suitable control circuit in order to determine a

Further processing to generate a suitable wake-up signal. In particular, the wake-up signal can have a predetermined pulse width, for example a pulse width in the range of one or more milliseconds. For example, the wake-up signal can have a pulse width between 2 and 4 milliseconds. Such a wake-up signal can be used to activate further components, such as a charge control for the electric vehicle. Any other components of the electric vehicle can also be activated on the basis of the wake-up signal. For example, that

The wake-up signal is first fed to a further circuit, which then activates the corresponding components, that is to say, for example, converts it from a sleep or standby mode into an active mode.

The charging plug to be detected can be any charging plug that is used to connect the electric vehicle to a charging point. For example, the charging connection can be connected using a plug in accordance with the Combined Charging System (CCS) standard, in accordance with the CHAdeMO standard or in accordance with the GB / T standard. Other charging interfaces are also possible for the detection of the insertion process of the charging plug. In addition, of course, any other plug connections, for example IEC 62196 type 1, 2 or 3

Charging plug or similar possible. As will be explained in more detail below, depending on the standard used, a rising or falling edge on the corresponding line of the

Charging plug can be detected. According to one embodiment, the first input of the differential amplifier is capacitively coupled to the input connection. In particular, the first input of the differential amplifier can thus be capacitively coupled to the corresponding line of the charging plug. In addition, a direct galvanic connection, possibly with ohmic resistors between the input connection and the first input of the differential amplifier, is also possible. Furthermore, parallel to the capacitor for capacitive coupling between the input terminal and the first input of the

Differential amplifier an ohmic resistor can also be provided.

According to one embodiment, the differential amplifier can be designed to detect a signal with a rising and / or falling edge at the first input. In this way, the insertion process can be detected when the charging plug is inserted into the electric vehicle even at a constant potential on the line to be monitored. In this case, the potential on the changes during the insertion process

Input connection according to the voltage signal on the to

monitoring line. This change can be evaluated by evaluating a

Voltage change (edge) during insertion can be detected accordingly. For example, when a charging plug is inserted according to the CHAdeMO standard, a falling edge can preferably be detected. When a charging plug is inserted in accordance with the CCS standard, a rising edge can preferably be detected. In addition, it is

possibly possible to detect both rising and falling edges and to generate a wake-up signal in both cases. For example, a first one can be used to detect a rising edge

Input connection and a first differential amplifier can be provided, and a second input connection with a second differential amplifier can be provided for evaluating a falling edge. The outputs of the two differential amplifiers can either be fed to a common control circuit and two separate control circuits.

According to one embodiment, the device for generating the

Wake-up signal comprise a voltage divider. The voltage divider can do this be designed to set the predetermined voltage potential at the second input of the differential amplifier. For example, the voltage divider can be provided between a voltage supply and a reference potential, a node between two resistors of the voltage divider providing a predetermined voltage potential corresponding to the divider ratio of the voltage divider. This node can be combined with the second

Input connection of the differential amplifier can be electrically coupled.

In addition, of course, any other arrangements for providing a predetermined voltage potential at the second input of the differential amplifier are also possible.

According to one embodiment, the control circuit is designed to output the wake-up signal when at the output terminal of the

Differential amplifier a voltage change occurs with a falling edge. In an alternative embodiment, the control circuit can output the wake-up signal when a rising edge occurs at the differential amplifier.

According to one embodiment, the control circuit comprises a timer. The timer can be designed to a predetermined pulse width of the

Set alarm signal. For example, the timing element can be a combination of a capacitor and a resistor.

For example, the pulse width can range from one or more

Milliseconds, in particular between 2 and 4 milliseconds.

According to one embodiment, the differential amplifier comprises an open collector output. Such a differential amplifier comprises a transistor, for example a bipolar transistor, with a free collector output. Analog can also be used with differential amplifiers with field effect transistors

Connection with an open drain connection may be provided. Such outputs are also called open-drain outputs. As an alternative to differential amplifiers with open collector output or open drain output, a differential amplifier with push-pull output could also be used.

In such a case, the circuit can be changed by means of a diode such that the output of the differential amplifier through the diode can essentially only flow current in one direction, ie the output of the Differential amplifier can essentially only lower current through the diode, that is, can discharge against masses, but cannot drive, that is, current can flow in the direction of the timing element.

According to one embodiment of the charging interface, the charging interface can comprise a wake-up device. The wake-up device can be designed to activate a charging circuit of the electric vehicle. In particular, the wake-up device can carry out an activation of the charging circuit of the electric vehicle based on the wake-up signal provided by the device for generating the wake-up signal. In addition, any other components of the electric vehicle can also be used using the

provided wake-up signal can be activated.

The above refinements and developments can be combined with one another as desired. Further refinements, developments and implementations of the invention also include combinations of previously or hereinafter not explicitly mentioned in relation to the

Features of the invention described embodiments. In particular, the person skilled in the art will also consider individual aspects as improvements or

Add additions to the respective basic forms of the invention.

Brief description of the drawings

The present invention is explained in more detail below with reference to the exemplary embodiments given in the schematic figures of the drawings. Show:

Figure 1: a block diagram of a device for generating a

Wake-up signal according to one embodiment;

Figure 2: a basic circuit diagram as it is a device for generating a

Wake-up signal based on another embodiment; Figure 3: a schematic diagram as it is a device for generating a

Wake-up signal based on another embodiment; and

Figure 4: a flowchart as it is a method for generating a

Underlying alarm signal.

Embodiments of the invention

Figure 1 shows a schematic representation of a block diagram as it is based on a device for generating a wake-up signal. These

Circuitry can be provided, for example, for a CCS charging interface. The device 1 comprises an input connection 10, a differential amplifier 20 and a control circuit 30. The input connection 10 can for example be connected to a contact of a charging plug, in particular a contact on the charging socket of an electric vehicle. For example, the input connection 10 can be connected to a control line of the charging connection. The charging port can be any charging port. For example, the

Charging connection according to the Combined Charging System (CSS) standard, the CHAdeMO standard or the GB / T standard. In addition, other charging connections with a type 1 or type 2 plug, or any other current or future charging standard are also possible. The input connection 10 can be connected to a first input 21

Differential amplifier 20 may be coupled. The input connection 10 can be coupled directly, via a resistor or also capacitively to the first input 21 of the differential amplifier 20. A second entrance 22 of the

Differential amplifier 20 can be coupled to a predetermined voltage potential. In the exemplary embodiment shown here, the predetermined voltage potential is formed from the two resistors 41 and 42 by means of a voltage divider 40, it being possible for the series connection of the two resistors 41 and 42 to be arranged between a supply voltage and a reference potential. The resistors 41 and 42 can also be a series and / or parallel connection of several individual resistors. Of course, any other are also Arrangements for providing a predetermined voltage potential at the second input 22 of the differential amplifier 20 are possible.

The output 23 of the differential amplifier 20 is coupled to the control circuit 30. The control circuit 30 outputs a wake-up signal with a predetermined pulse width as a result of a voltage change at the output 23 of the differential amplifier 20 at an output connection 31. For example, the control circuit 30 can then each have a wake-up signal with the predetermined one

Output pulse width when the voltage signal at the output 23 of the

Differential amplifier 20 drops, that is, a falling edge in the

Output voltage signal of the differential amplifier 20 occurs. Analogously, however, it is also fundamentally possible to switch on when a rising edge occurs in the voltage signal at the output 23 of the differential amplifier 20

Output alarm signal with a specified pulse width.

The pulse width of the wake-up signal can be set, for example, by means of a suitable timer 33 in the control circuit 30. For example, the pulse width can be set in the range of one or more milliseconds, for example between 2 and 4 milliseconds. The timing element 33 can be a combination of a resistor and a capacitor, for example. For example, the capacitor can be discharged at a corresponding edge at the output 23 of the differential amplifier 20, and can then be gradually recharged via a further resistor R31, R32. In this case, the control circuit 30 can output an active wake-up signal until the capacitor in the timer 33 of the control circuit 30 is charged. Of course, there are also any other designs for setting a predetermined time constant for the

Pulse width of the wake-up signal possible. In particular, as will be explained below, the timer can also be implemented by means of a counter or the like.

The differential amplifier 20 can be any one

Differential amplifier, for example an operational amplifier. In particular, operational amplifiers with the lowest possible energy consumption are suitable for this. Differential amplifier with a low energy requirement thus require only a very small current flow during operation to detect the insertion of a charging plug, so that the load on the energy supply in the electric vehicle is minimized.

In particular, the differential amplifier 20 can be one

Trade differential amplifiers with an open collector output or an open drain output.

Alternatively, it is also possible to use the differential amplifier 20 as a microcontroller, in particular as a microcontroller, with a particularly low level

Power consumption to realize. For example, the two signals at the inputs 21, 22 of the differential amplifier can be converted into digital signals by means of an analog-digital converter (ADC), which are then transmitted by the

Microcontrollers can be processed accordingly. As a result of the further processing, the microcontroller can provide a corresponding signal at a starting point of the microcontroller, which signal corresponds to the signal at output 23 described above.

In addition or alternatively, the timer 33 can also be implemented as a digital circuit, for example by means of a microcontroller.

For example, the time limit can be realized by a corresponding counter. This counter can, for example, also be implemented in the microcontroller described above, in which the differential amplifier 20 is also implemented. In this way, all components between the inputs 21, 22 of the differential amplifier and the output of the timing element 33 can be implemented by means of a microcontroller.

FIG. 2 shows a schematic illustration of a basic circuit diagram of a device 1 for generating a wake-up signal. For protection and

The supply voltage can be stabilized accordingly

Protection circuit 50 may be provided. This circuit 50 can be connected to a permanent voltage source 51, for example a low-voltage battery or the like. The protective circuit may have a protective diode D50, for example a zener diode or the like, to avoid possible

Filter voltage peaks. Furthermore, at the input of the protective circuit 50 a resistor R50 may be provided. The resistor R50 can be a relatively low-resistance resistor, for example, which typically has a value of 100 ohms or less. For

Stabilization and filtering of higher-frequency components can also occur between the voltage supply and a reference potential

Capacitor C50 may be provided.

The stabilized voltage can be used as the supply voltage

Differential amplifier 20 and the control circuit 30 are provided.

Furthermore, the stabilized voltage can be supplied to the voltage divider 40 from the resistors R41 and R42. In a node that connects the resistors R41 to the resistor R42, a stabilizing capacitor C40 can also be provided. The resistors 41 and 42 are preferably designed to have a relatively high resistance and have a value of, for example, 100 kOhm or more, so that the load can be kept relatively low. In particular, the resistor 41 can, for example, also be realized from a series connection of several individual resistors.

The voltage of the node is at the second input 22 of the

Differential amplifier 20 provided.

The first input 21 of the differential amplifier 20 is connected to the input connection 10, to which a voltage signal of a line of the charging connection, in particular a control line of the charging connection, is connected. A protection diode D10 can be provided at the input terminal 10 to prevent reverse current flows. This diode can

in particular also be part of the respective charging interface, for example a CCS charging interface. The input terminal 10 is connected to the first input 21 of the differential amplifier 20 via the capacitor C1 and the resistor R12. Furthermore, to stabilize and to provide a defined resting level, the first input 21 of the

Differential amplifier can be connected to a parallel connection of the resistors R13 and the capacitor C13. The resistor R13 and the capacitor C13 are connected to the other connection with a predetermined potential, for example the reference potential. The output 23 of the differential amplifier 20 is connected to an input of the

Control circuit 30 connected. The control circuit 30 further comprises a switching element T30, for example a bipolar transistor. Alternatively, however, a field effect transistor is possible. A resistor R31 is provided between an input of transistor T30 and a control connection of transistor 30, so that transistor T30 is initially blocked. Furthermore, a further resistor R32 and the resistor R33 of the timer 33 from the resistor R33 and the

Capacitor C33 is provided so that the output 23 of the differential amplifier 20 is connected to the control terminal of the transistor T30 via the resistors R32 and R33. If the voltage at output 23 of the

Differential amplifier 20, the voltage at the control terminal of transistor T30 also drops, and transistor T30 becomes conductive. The capacitor C33 is then slowly recharged via the resistors R31 and R32. Until the capacitor C33 is charged, a voltage pulse is present at the output 31 of the control circuit 30, which delivers a wake-up signal for waking up a component, for example the charging circuit of the electric vehicle.

The pulse width of the wake-up signal can thus be set by dimensioning the resistors R31, R32, R33 and C33. The resistor R33 can be omitted if necessary. In particular, the R33 can be provided if

Differential amplifier 20 is implemented without a push-pull output. In this case, depending on the dimensioning, the resistor R33 may also be provided with a series diode. In addition, it is also possible that the time constant for the pulse width of the wake-up signal can also be adapted by appropriate dimensioning of the components, in particular the input circuitry, such as C11 and R12, at the input 21 of the differential amplifier 20. In this case, the resistor R33 at the output 23 of the differential amplifier and the

Capacitor C33 in the control circuit 30 is eliminated.

The circuit arrangement of the device 1 for generating the wake-up signal described here thus generates a at the output 31 of the control circuit 30 Wake-up signal with a predetermined pulse width when a rising voltage edge occurs at input terminal 10.

FIG. 3 shows a further basic circuit diagram of a device 1 for generating a wake-up signal. This circuit arrangement can be provided, for example, for a CHAdeMO charging interface. The circuit arrangement according to FIG. 3 largely corresponds to the circuit arrangement according to FIG. 2, only the input circuits of the first input 21 and the second input 22 of the differential amplifier 20 being modified. In this way, a wake-up signal is generated at a falling edge at input terminal 10 and provided at output 31 of control circuit 30. In this exemplary embodiment, a resistor R11 is also provided in parallel with the capacitor C11. Furthermore, the resistor R13 from FIG. 2 can be omitted here. Instead, a resistor R13 'is provided at the input 21 of the differential amplifier 20.

FIG. 4 shows a flowchart as it is based on a method for generating a wake-up signal when plugging in a charging plug according to one embodiment. In step S1, an electrical signal is detected at a contact of the charging plug. In step S2, the detected electrical signal from the charging plug is compared with a predetermined voltage potential. The comparison can be made by means of a differential amplifier 20 or a power-saving microcontroller. In step S3, a voltage signal is output as a function of the comparison of the detected electrical signal from the charging plug with the predetermined voltage potential. When using a microcontroller, for example, an internal value can be stored. The voltage signal can be provided, for example, at the output of the differential amplifier 20 or at a microcontroller port. Finally, a wake-up signal with a predetermined pulse width is provided in step S4 if the voltage signal is provided in step S3. In particular, a wake-up signal with a predetermined pulse width is provided when a voltage change occurs at the output of the differential amplifier. As already described above, the pulse width can also be realized, for example, by means of a counter, for example within a microcontroller. In summary, the present invention relates to the generation of a wake-up signal when a charging plug is inserted, in particular when

Inserting a charging plug into an electric vehicle. For this, a

Voltage change on a line of the charging connection, in particular a voltage change on a signal or control line of the charging connection, is detected. The detection is preferably carried out by means of a differential amplifier or a power-saving microcontroller. After by the

Differential amplifier a voltage change, that is, a falling or rising edge has been detected, a wake-up signal with a predetermined pulse width is output.

Claims

Expectations

Claims 1. Device (1) for generating a wake-up signal when a charging plug is inserted, comprising: an input connection (10) which is designed to be electrically coupled to a contact of the charging plug; a differential amplifier (20) which is coupled to the input terminal (10) at a first input (21) and which is coupled to a predetermined voltage potential at a second input (22); a control circuit (30) with an output (23) of the

Differential amplifier (20) is coupled, and which is designed to output a wake-up signal with a predetermined pulse width when a voltage change occurs at the output (23) of the differential amplifier.

2. Device (1) according to claim 1, wherein the first input (21) of the

Differential amplifier is capacitively coupled to the input terminal (10).

3. Device (1) according to claim 1 or 2, wherein the differential amplifier (20) is designed to detect a signal with a rising and / or falling edge at the first input (21).

4. Device (1) according to one of claims 1 to 3, with a

Voltage divider (40), which is designed to the predetermined

Voltage potential a second input (22) of the

Differential amplifier (20) to set.

5. Device (1) according to one of claims 1 to 4, wherein the

Control circuit (30) is designed to output the wake-up signal when a at the output (23) of the differential amplifier (20)

Voltage change occurs with a falling edge.

6. Device (1) according to one of claims 1 to 5, wherein the

Control circuit (30) comprises a timing element (33) which is designed to set the predetermined pulse width of the wake-up signal.

7. The device (1) according to any one of claims 1 to 6, wherein the

Differential amplifier (20) comprises an open collector output.

8. Charging interface for an electric vehicle, comprising: a plug connection, which is designed to receive a charging plug, and a device (1) for generating a wake-up signal according to one of claims 1 to 7; wherein the input port (10) of the device for generating the

Wake-up signal is coupled to a contact of the connector.

9. Charging interface according to claim 8, with a wake-up device, which is designed to activate a charging circuit of the electric vehicle.

10. Method for generating a wake-up signal when plugging in a

Charging plug, with the steps:

Detection (Sl) of an electrical signal at a contact of the

Charging plug;

Comparing (S2) the detected electrical signal from the charging plug with a predetermined voltage potential; Outputting (S3) a voltage signal as a function of the comparison of the detected electrical signal from the charging plug and the predetermined voltage potential; Generating (S4) a wake-up signal with a predetermined pulse width when a voltage change occurs on the output voltage signal.