Monitoring device and method of monitoring impedance of protective conductor, and charging control unit
A technology for monitoring equipment and protective conductors, applied in impedance measurement, single semiconductor device testing, charging stations, etc., can solve the problems that optocoupler circuits are prone to significant aging and temperature drift, and depend on power supply voltage, etc., to achieve flexible positioning , Avoid potential dangers, enhance the effect of protection
Active Publication Date: 2019-07-09
TE CONNECTIVITY GERMANY GMBH +1
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- Description
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- Application Information
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Problems solved by technology
[0006] However, the known arrangements have the disadvantage that they strongly depend on the supply voltage
In addition, optocoupler circuits are subject to significant aging and temperature drift, so it must be ensured that these effects are not included in the measurement results
[0007] Therefore, there is a need for monitoring equipment for monitoring the impedance of protective conductors, which eliminates the disadvantages of known solutions and which can be produced safely and reliably, but still be cost-effective
Method used
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[0031] Reference is made hereinafter to the accompanying drawings and in particular to the first figure 1 The invention is described in more detail with a monitoring device 100 according to the invention.
[0032] Starting from the basic principle, according to the invention, for monitoring the resistance between the input terminals E1, E2 and the impedance RE of the protective conductor PE, a Wheatstone bridge circuit is used. A bridge circuit consists of two voltage dividers connected in parallel which operate with an input voltage applied across input terminals E1 and E2. The first voltage divider includes resistors R1 and R2. The second voltage divider includes resistor R3 and diode D5 as discrete components. Furthermore, the impedance of the protective conductor PE constitutes a virtual resistance element RE.
[0033] As is generally known in Wheatstone measuring bridges, a state of equilibrium exists if there is no voltage across the bridge branches between nodes K1 a...
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The present invention relates to a monitoring device and method of monitoring an impedance of a protective conductor. A first voltage divider is arranged between a first input terminal and a second input terminal, which can be connected to a voltage source. The first voltage divider comprises a series connection of a first resistor and a second resistor, the second resistor corresponding to a threshold value of the impedance of the protective conductor. A second voltage divider comprises a series connection of a third resistor and a bridge diode, and is connected with a first end of the thirdresistor to the first resistor, and is connectable with a second end to the protective conductor. A measuring device is connected between a first node that is arranged between the first resistor and the second resistor, and a second node, which is arranged between the third resistor and the bridge diode. A bridge voltage is detected between the first and second node if the impedance of the protective conductor is higher than the second resistor.
Description
technical field [0001] The invention relates to a monitoring device and method for monitoring the impedance of a protective conductor. The invention also relates to a charging control unit for controlling the charging process of a battery in a motor vehicle, and a charging cable for connecting the battery of a motor vehicle with a voltage source, in particular for charging an electric vehicle. Background technique [0002] Electric vehicles can be charged in various charging modes. These charging modes differ, inter alia, in terms of safety equipment, communication with the vehicle, and charging capacity. For safety reasons, most vehicle manufacturers choose Mode 3 charging. However, Mode 2 charging involves conventional household plug and socket equipment, constituting a form of charging that is compatible with the vehicle. These charging modes are defined in the international standard IEC 61851-21:2010 as follows: Mode 3 charging is the safest way to charge a vehicle. ...
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Patent Timeline
Login to View More IPC IPC(8): G01R31/26G01R31/04G01R17/10G01R17/14G01R27/16G01R27/18G01R31/58
CPCG01R17/14G01R27/18G01R17/105G01R31/54G01R31/52Y02T10/70Y02T90/14Y02T10/7072Y02T90/12G01R31/58B60L53/18G01R27/20G01R31/2632B60Y2200/91H02J7/00712H02J7/0047B60L53/62G01R15/04H02J7/0042
Inventor S.基普G.卡拉施S.斯特罗斯S.恩格特
Owner TE CONNECTIVITY GERMANY GMBH