• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a traction battery charging station (10) for direct current charging of a traction battery (24) of a motor vehicle (20) with an electric traction motor, with a power-voltage converter (50) that converts an electric direct voltage charging power into a A pair of two charging lines (L1, L2) feeds a charging controller (52), and an insulation monitor (30) with two electrical measuring resistors (36, 36 '), which are each connected to a charging line (L1, L2) and each via one Resistance switches (34, 34 ') can be connected to protective earth (38), with the insulation monitor (30) providing electrical insulation of the charging line pair (L1, L2) from protective earth (38) when the traction battery (24 ) supervised. The insulation monitor (30) has a test mode control (32) which has an unlimited no-charge test mode in which one resistance switch (34, 34 ') is closed and the other resistance switch (34', 34) is open at the same time, and a symmetrical Charge test mode, in which both resistance switches (34, 34 ') are closed at the same time or open at the same time, saved and can control.
    公开号:CH716791A2
    申请号:CH01177/20
    申请日:2020-09-18
    公开日:2021-05-14
    发明作者:Hähre Karsten；Jankovic Marija；Roggendorf Christoph
    申请人:Porsche Ag；
    IPC主号:
    专利说明:

    The invention relates to a traction battery charging station for charging a motor vehicle traction battery with direct current.
    The traction battery charging station has a power-voltage converter which provides an electrical charging DC voltage in the charging mode and feeds it into a pair of two DC charging lines. The charging station has a charging controller that monitors, controls and regulates the charging process and its preparation. For safety reasons, electrical insulation monitoring is required in traction battery charging stations, which electrically monitors the electrical insulation or the electrical resistance between the charging lines on the one hand and the protective earth on the other. Such charging stations are known, for example, from DE 10 2015 107 161 A1 and DE 10 2015 110 023 A1.
    A typical insulation monitoring of a charging station consists of an insulation monitor with two electrical measuring resistors or circuits, which are each connected to a charging line and can be connected to protective earth via a resistance switch. When the resistance switch is closed, the insulation resistance of the charging line in question can be determined very precisely, for example via a resistance bridge, of which the measuring resistor is a part. The legal safety regulations require both the detection of so-called symmetrical insulation faults, which are caused, for example, by the aging of insulation materials, and the detection of so-called asymmetrical insulation faults, which are caused by acute damage.
    Asymmetrical insulation faults can be determined by a symmetrical test mode in which both resistance switches are closed at the same time, so that the insulation resistance of both charging lines of a charging line pair can be determined individually. However, symmetrical insulation faults cannot be determined here. Symmetrical insulation faults are determined by an asymmetrical test mode in which the resistance switches are only alternately closed or opened, i.e. the two charging lines are only measured individually with regard to their insulation resistance.
    Typically, both before the actual charging process and during the charging process, both charging lines are constantly and alternately checked in the symmetrical and the asymmetrical test mode. However, in charging mode, the asymmetrical test mode limits the electrical robustness of the charging station and the relevant motor vehicle. Under certain conditions of use, this can lead to malfunctions, which in particular can disrupt communication between the charging station and the connected motor vehicle.
    The object of the invention is therefore to create a traction battery charging station with an insulation monitor, through which electrical interference between the charging station and the motor vehicle can be avoided.
    This object is achieved according to the invention by a traction battery charging station having the features of claim 1 and by a method according to claim 4 for controlling the insulation monitor of the charging station according to claim 1.
    The traction battery charging station according to the invention is provided for charging a traction battery of a motor vehicle equipped with an electric traction drive. The charging station has a power-to-voltage converter which, in charging mode, feeds an electrical direct voltage charging power into a pair of two direct current charging lines. The two charging lines are also referred to as the plus charging line and the minus charging line and are part of a closed and electrically ungrounded charging circuit that is galvanically isolated from the protective earth.
    The charging station has an insulation monitor with two ohmic measuring resistors, which are each connected to a charging line and can be connected to the protective earth on the other side via a switchable resistance switch. When the resistance switch is closed, the ohmic insulation resistance of the relevant charging line with respect to the electrical protective earth can be determined with respect to the connected charging line, for example via a resistance bridge.
    According to the invention it is provided that the insulation monitor has a test mode control that has an asymmetrical non-charging test mode in which one resistance switch is closed and the other resistance switch is open at the same time, or vice versa, and a symmetrical charging test mode and has can control, in which both resistance switches are either closed or open at the same time. This ensures that no asymmetrical test mode is activated during a charging process.
    The insulation monitor learns from another control element of the charging station whether a charging process is active or whether the motor vehicle is electrically connected to the charging station. If the insulation monitor is notified of an active charging process or, alternatively or additionally, an electrical connection between the motor vehicle and the charging station is reported, the insulation monitor switches to the charging test mode, in which only a symmetrical insulation measurement can or takes place.
    Before each charging process, a complete insulation test is compulsorily carried out by the insulation monitor both in the asymmetrical test mode and in the symmetrical test mode. This can be done, for example, by what is known as a bus shifting method. This determines the state of insulation of the two charging lines up to the charging plug of the charging station. As soon as the charging process begins, the test mode control switches to the charging test mode, in which only the symmetrical test mode is carried out. It is true that in the symmetrical test mode, in particular, no age-related and systematic deterioration in the electrical insulation of the charging lines with respect to the protective earth is detected. However, a wide-meshed check, for example a daily check, is of course completely sufficient for this. The waiver of the asymmetrical test mode during the charging process therefore does not represent a significant impairment of the insulation security monitoring.
    Preferably, the test mode control activates only the charge test mode during the charging operation reported by the charge control to the insulation monitor.
    Alternatively or in addition to this, the charging plug on the charging station side, into which the pair of charging lines opens, can have a connection sensor that detects the connection of the charging plug to a vehicle-side charging socket. The test mode control is informally linked to the connection sensor. The test mode control switches on the charging test mode when the connection sensor reports a connection. This ensures that the insulation monitor only works in the charging test mode as soon as the charging station is electrically connected to the motor vehicle in question.
    According to the inventive method for controlling the insulation monitor of the traction battery charging station, the following steps are provided: Upon receipt of a charging request and before the start of charging, the non-charging test mode is switched on so that the two resistance switches are opened and closed several times complementary to each other become. As soon as the no-charging test mode has been completed with a positive result, the actual charging operation can be started. As soon as the charging operation has started and as long as the charging operation continues, the test mode control switches on the charging test mode in which both resistance switches are always either closed at the same time or open at the same time.
    The insulation monitor can also be designed so that it regularly carries out a self-test, both before a connection and during a connection of the charging plug on the charging station side with a charging socket on the vehicle side.
    In the following, an embodiment of the invention is explained in more detail with reference to the drawings. The figures show: FIG. 1 schematically a traction battery charging station with an insulation monitor and an integrated test mode control in the no-charge test mode and a non-connected motor vehicle, and FIG. 2 shows the arrangement of FIG. 1 with the connected motor vehicle and the test mode control in the charge test mode .
    In the figures, an arrangement consisting of a traction battery charging station 10 and a motor vehicle 20 with a traction battery 24 is shown schematically, which has an electric traction motor.
    The charging station 10 has a power-voltage converter 50, which is fed with AC voltage from a public electrical power network 12, and which has a galvanic separation 54. The power-voltage converter 50 feeds a pair of two charging lines L1, L2 with electrical high-voltage direct current charging power. The charging station 10 also has an electronic charging controller 52, which monitors all processes of the charging station 10, and in particular monitors and controls the charging process and its preparation. The two charging lines L1, L2 open into a charging plug 21 on the charging station side, which can be plugged together with a corresponding charging socket 22 on the vehicle side, as shown in FIG. The charging plug 21 has a connection sensor 21 ′ which detects the connection between the charging plug 21 and the charging socket 22.
    When the charging plug 21 is plugged together with the charging socket 22, the traction battery 24 of the motor vehicle 20 can be charged via the two charging lines L1, L2.
    The charging station 10 also has an insulation monitor 30 through which the two charging lines L1, L2 are passed. A measuring resistor 36, 36 'and a resistance switch 34, 34' connected in series with the measuring resistor 36, 36 'are assigned to each charging line L1, L2 in the insulation monitor 30. When the resistance switch 34 'is closed, the relevant charging line L2 is electrically connected to the protective earth 38 via the relevant measuring resistor 36'. The measuring resistor 36, 36 ′ can be designed as part of a resistance bridge, the detuning of which is determined in order in this way to precisely determine the electrical insulation resistance of the relevant charging line L1, L2 with respect to the protective earth 38.
    The insulation monitor 30 has a test mode controller 32 which is electrically or informally connected to the measuring resistors 36, 36 ', the resistance switches 34, 34', the charging controller 52 and the connection sensor 21 '. The test mode controller 32 has stored, inter alia, two test modes, namely an asymmetrical no-charge test mode in which one of the two resistance switches 34 'is closed and the other resistance switch 34 is open, or vice versa, and a symmetrical charge test mode in which both resistance switches 34, 34 'are always closed at the same time or open at the same time.
    As soon as the charging controller 52 registers a charging request, this is also registered by the test mode controller 32, which then starts the non-charging test mode, and here performs both a symmetrical test and a non-symmetrical test of the insulation resistance of the two charging lines L1, L2 . In particular, the test mode controller 32 carries out the asymmetrical test in which the two resistance switches 34, 34 'are closed and opened several times complementary to one another using a so-called bus shifting method, as shown in FIG. In this way, in particular symmetrical errors or symmetrical changes in the insulation resistance of the two charging lines L1, L2 are detected.
    As soon as the charging controller 52 signals the start of charging or the connection sensor 21 'reports the mechanical and electrical connection of the charging plug 21 to the vehicle-side charging socket 22, the test mode controller 32 switches to the charging test mode, in which exclusively a symmetrical test of the insulation resistance of the two charging lines L1, L2 is carried out, as shown in FIG. As long as the charging operation continues or the charging station 10 and the motor vehicle 20 are electrically connected to one another, the test mode controller 32 does not switch off the charging test mode, so that there are no asymmetricals during the charging operation or during the exchange of information between the motor vehicle 20 and the charging station 10 Measurement of the insulation resistance of the charging lines L1, L2 is made.
    权利要求:
    Claims (4)
    [1]
    1. Traction battery charging station (10) for direct current charging of a traction battery (24) of a motor vehicle (20) with an electric traction motora power-to-voltage converter (50) which feeds an electrical direct voltage charging power into a pair of two charging lines (L1, L2) in charging mode,a charging controller (52), andan insulation monitor (30) with two electrical measuring resistors (36, 36 '), each of which is connected to a charging line (L1, L2) and can be connected to protective earth (38) via a resistance switch (34, 34') Insulation monitor (30) monitors the electrical insulation of the pair of charging lines (L1, L2) with respect to protective earth (38) when not charging and when charging the traction battery (24),characterized in thatthe insulation monitor (30) has a test mode control (32) which has an unrestricted no-charge test mode in which one resistance switch (34, 34 ') is closed and the other resistance switch (34', 34) is open at the same time, and a symmetrical charge -Test mode in which both resistance switches (34, 34 ') are closed at the same time or open at the same time, saved and can control.
    [2]
    2. traction battery charging station (10) according to claim 1, wherein during the charging operation reported by the charging controller (52) to the insulation monitor (30), the test mode controller (32) only activates the charging test mode.
    [3]
    3. traction battery charging station (10) according to any one of the preceding claims, wherein the charging line pair (L1, L2) opens into a charging station-side charging plug (21) which has a connection sensor (21 '), which the connection of the Detected charging plug (21) with a vehicle-side charging socket (22), the test mode controller (32) only switching on the charging test mode when a connection is reported by the connection sensor (21 ').
    [4]
    4. A method for controlling the insulation monitor (30) of the traction battery charging station (10) with the features according to one of the preceding claims, with the method steps:upon receipt of a charging operation request and before the start of charging operation: switching on the non-charging test mode so that the resistance switches (34, 34 ') are opened and complementary to one anotherbe closed, andDuring the following charging operation: Switching on the charging test mode so that the resistance switches (34, 34 ') are opened and closed synchronously with one another.
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE102013226595A1|2013-12-19|2015-06-25|Bender Gmbh & Co. Kg|Device for insulation monitoring|
    US9702917B2|2014-06-17|2017-07-11|Ford Global Technologies, Llc|Detection of and response to second leakage detection circuit|
    DE102015117678A1|2015-10-16|2017-04-20|Bender Gmbh & Co. Kg|Insulation fault protective device with switch-off function for ungrounded power supply systems|
    DE102017113533A1|2017-06-20|2018-12-20|Dr. Ing. H.C. F. Porsche Aktiengesellschaft|Method and apparatus for compensating for mass offset in a high voltage vehicle system|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE102019130421.0A|DE102019130421A1|2019-11-12|2019-11-12|Traction battery charging station|
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