Method and device for measuring an interference suppression capacitor of an electric vehicle

Abstract

Method and device (112) for measuring an interference suppression capacitor (110, 111) of an electric vehicle (100), wherein the device (112) has a measuring device (118) with a resistor (119) for recharging the charge of the interference suppression capacitor (110, 111) in a measuring process with the measuring device (118), and a voltmeter (120) for measuring a voltage dropping across the resistor (119) during the recharging in the measuring process, wherein the measuring device (118) comprises a switch (121) which is designed to switch the resistor (119) in parallel with the interference suppression capacitor (110, 111) during the measuring process, wherein the device (112) comprises a charging plug (113) for connecting the measuring device (118) to a charging socket (102) of the electric vehicle (100).

Description

[0001] The invention relates to a method and a device for measuring an interference suppression capacitor of an electric vehicle.

[0002] DE 10 2021 108 280 A1 discloses a DC / DC converter device with a connection socket for a charging plug of an electric vehicle.

[0003] Suppression capacitors are used in electric vehicles to comply with EMC limits. To protect electric vehicle users, the capacitances of the suppression capacitors are limited. The capacitances of the suppression capacitors are regularly measured during the development of an electric vehicle. Previous measurement methods require special test points on the high-voltage electrical system of the respective electric vehicle and do not detect the suppression capacitors if the high-voltage electrical system includes charging contactors between the test points and the suppression capacitors.

[0004] By means of the method and the device according to the independent claims, the capacitances of the interference suppression capacitors can be measured without additional measuring taps on the high-voltage vehicle electrical system.

[0005] The device for measuring an interference suppression capacitor of an electric vehicle has a measuring device with a resistor for recharging the charge of the interference suppression capacitor in a measuring process with the measuring device, and a voltmeter for measuring a voltage dropping across the resistor during the recharging in the measuring process, wherein the measuring device comprises a switch which is designed to connect the resistor in parallel to the interference suppression capacitor during the measuring process, wherein the device comprises a charging plug for connecting the measuring device to a charging socket of the electric vehicle.

[0006] It can be provided that the device comprises a microcontroller which is designed to determine measured values by, in particular, high-frequency sampling of the voltage detected by the voltmeter.

[0007] It can be provided that the microcontroller is designed to store the measured values in a memory.

[0008] It can be provided that the microcontroller is designed to determine a result of the measurement depending on the measured values and to store it in a memory.

[0009] It can be provided that the device comprises the memory.

[0010] It can be provided that the device comprises a charging socket for connecting a charging infrastructure, wherein the measuring device is arranged between the charging plug and the charging socket

[0011] It can be provided that the device has a conductor between the charging socket and the charging plug and an earth connection, wherein the measuring device is arranged between the earth connection and the conductor.

[0012] It can be provided that the device has a return conductor between the charging socket and the charging plug, wherein a resistor and a switch are arranged between the earth connection and the return conductor, wherein the switch is designed to connect the resistor in parallel with the interference suppression capacitor during the measuring process.

[0013] The method for measuring an interference suppression capacitor of an electric vehicle provides that the device is connected to the electric vehicle with the charging plug before the measuring process, and the resistor is connected in parallel to the interference suppression capacitor during the measuring process.

[0014] It may be provided that the device is connected to the charging infrastructure with the charging socket before the measurement process.

[0015] Further advantageous embodiments can be found in the following description and the drawing.

[0016] The drawing shows: Fig. 1 a schematic representation of an electric vehicle and a device for measuring an interference suppression capacitor of the electric vehicle, Fig. 2 a flowchart with steps of a method for measuring the interference suppression capacitor.

[0017] In Fig. 1 shows a schematic representation of an electric vehicle 100.

[0018] The electric vehicle 100 comprises a high-voltage battery 101 and a charging socket 102, which is connected to a positive pole of the high-voltage battery 101 via a conductor 103 and to a negative pole of the high-voltage battery 101 via a return conductor 104. A first charging contactor 105 is arranged in the conductor 103. A second charging contactor 106 is arranged in the return conductor 104. The charging socket 102 is connected to a ground conductor 107 of the electric vehicle 100. A first interference suppression capacitor 108 is arranged between the ground conductor 107 and the conductor 103, between the high-voltage battery 101 and the first charging contactor 105. A second interference suppression capacitor 109 is arranged between the ground conductor 107 and the return conductor 104, between the high-voltage battery 101 and the second charging contactor 106. A third interference suppression capacitor 110 is arranged between the ground conductor 107 and the conductor 103, between the charging socket 102 and the first charging contactor 105.A fourth interference suppression capacitor 111 is arranged between the ground conductor 107 and the return conductor 104, between the charging socket 102 and the second charging contactor 106.

[0019] In Fig. 1 shows a schematic representation of a device 112 for measuring the interference suppression capacitors of the electric vehicle 100.

[0020] The device 112 has a charging plug 113 for connecting the device 112 to the charging socket 102.

[0021] The device 112 optionally comprises a charging socket 114 for connecting a charging infrastructure 115.

[0022] The device 112 has a conductor 115 between the charging socket 114 and the charging plug 113. The device 112 has a return conductor 116 between the charging socket 114 and the charging plug 113. The device 112 has a ground connection 117.

[0023] The device 112 has a measuring device 118 with a resistor 119 for recharging the charge of the interference suppression capacitors in a measuring process with the measuring device 118.

[0024] The device 112 has a voltmeter 120 for measuring a voltage drop across the resistor 119 during the charge transfer in the measuring process.

[0025] The measuring device 118 comprises a switch 121 which is designed to connect the resistor 119 in parallel to the interference suppression capacitors during the measuring process.

[0026] In the example, the measuring device 118 is arranged between the ground terminal 117 and conductor 115. The switch 121 is designed to connect the resistor 119 in parallel with the interference suppression capacitors between the ground terminal 117 and conductor 115 during the measuring process.

[0027] In the example, the measuring device 118 is arranged between the charging plug 113 and the charging socket 114.

[0028] It can be provided that a resistor 122 and a switch 123 are arranged between the earth connection 117 and the return conductor 116, wherein the switch 123 is designed to connect the resistor 122 in parallel with the interference suppression capacitors between the earth connection 117 and the return conductor 116 during the measuring process.

[0029] It can be provided that the device 112 comprises a microcontroller 124 which is designed to determine measured values by, in particular, high-frequency sampling of the voltage detected by the voltmeter 120.

[0030] It may be provided that the device 112 comprises a memory 125.

[0031] It can be provided that the microcontroller 124 is designed to store the measured values in a memory 125.

[0032] It can be provided that the microcontroller 124 is designed to determine a result of the measurement depending on the measured values.

[0033] It can be provided that the microcontroller 124 is designed to store the result of the measurement in the memory 125.

[0034] It can be provided that the microcontroller 124 is designed to transmit the measured values or the result to an interface of the device 112 (in Fig. 1 not shown).

[0035] In Fig. Figure 2 shows a flowchart with steps of a method for measuring the interference suppression capacitors.

[0036] The method comprises a step 201.

[0037] In step 201, the device 112 is connected to the electric vehicle 100, ie the charging socket 102, with the charging plug 113 before the measuring process.

[0038] It may be provided that the device 112 is connected to the charging infrastructure 115 with the charging socket 114 before the measuring process.

[0039] By connecting the device 112, a charging process is simulated, ie the charging contactors 105, 106 close and the interference suppression capacitors are charged.

[0040] The method includes a step 202.

[0041] In step 202, resistor 119 is connected in parallel with the interference suppression capacitors during the measurement process. It may be provided that resistor 122 is connected in parallel with the interference suppression capacitors during the measurement process.

[0042] When resistors are connected in parallel, the interference suppression capacitors are recharged via the resistors.

[0043] The measurement process is performed in step 202. During the measurement process, measured values are determined, particularly by high-frequency sampling of the voltage detected by the voltmeter 120. It may be provided that in step 202, the measurement result is calculated based on the measured values.

[0044] The result of the measurement is, for example, a capacitance of the interference suppression capacitors or the respective capacitance of the respective interference suppression capacitor.

[0045] The voltage measured with resistor 119 connected in parallel allows conclusions to be drawn about the total capacitance of the interference suppression capacitors or the capacitance of the respective interference suppression capacitor.

[0046] The method optionally includes a step 203.

[0047] In step 203, it can be provided that the measured values from the measuring process are stored in the memory 125 or output via the interface.

[0048] In step 203, it may be provided that the result of the measurement is stored in memory 125 or output via the interface. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2021 108 280 A1

[0002]

Claims

[1] Device (112) for measuring an interference suppression capacitor (110, 111) of an electric vehicle (100), characterized by in that the device (112) has a measuring device (118) with a resistor (119) for recharging the charge of the interference suppression capacitor (110, 111) in a measuring process with the measuring device (118), and a voltmeter (120) for measuring a voltage dropping across the resistor (119) during the recharging in the measuring process, wherein the measuring device (118) comprises a switch (121) which is designed to switch the resistor (119) in parallel with the interference suppression capacitor (110, 111) during the measuring process, wherein the device (112) comprises a charging plug (113) for connecting the measuring device (118) to a charging socket (102) of the electric vehicle (100). [2] Device (112) according to claim 1, characterized bythat the device (112) comprises a microcontroller (124) which is designed to determine measured values by, in particular, high-frequency sampling of the voltage detected by the voltmeter (120). [3] Device (112) according to claim 2, characterized by that the microcontroller (124) is designed to store the measured values in a memory (125). [4] Device (112) according to claim 2 or 3, characterized by that the microcontroller (124) is designed to determine a result of the measurement depending on the measured values and to store it in a memory (125). [5] Device (112) according to one of claims 2 or 3, characterized by that the device (112) comprises the memory. [6] Device (112) according to one of the preceding claims, characterized by, the device (112) comprises a charging socket (114) for connecting a charging infrastructure (115), wherein the measuring device (118) is arranged between the charging plug (113) and the charging socket (114) [7] Device (112) according to one of the preceding claims, characterized by , the device (112) has a conductor (115) between the charging socket (114) and the charging plug (113) and an earth connection (117), wherein the measuring device (118) is arranged between the earth connection (117) and the conductor (115). [8] Device (112) according to claim 7, characterized by , the device (112) has a return conductor (116) between the charging socket (114) and the charging plug (113), wherein a resistor () and a switch () are arranged between the earth connection (117) and the return conductor (116), wherein the switch () is designed to switch the resistor () in parallel with the interference suppression capacitor (110, 111) during the measuring process. [9] Method for measuring an interference suppression capacitor (110, 111) of an electric vehicle (100), characterized by that the device (112) according to one of claims 1 to 7 is connected (201) to the electric vehicle (100) with the charging plug before the measuring process, and the resistor is connected (202) in parallel with the interference suppression capacitor (110, 111) during the measuring process. [10] Method according to claim 9, characterized by that the device (112) according to claim 8 is connected (201) to the charging infrastructure (115) with the charging socket (114) before the measuring process.

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