US 11,486,907 B2Granted

Monitoring device and method of monitoring an impedance of a protective conductor, and charging control unit

AssigneesTE Connectivity Germany GmbH, Heidelberger Druckmaschinen AG

InventorsStefan Kipp, Gregor Karrasch, Stefan Stross, Stefan Engert

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Abstract

A monitoring device for monitoring an impedance of a protective conductor. The monitoring device has a first voltage divider for connection to a voltage source including a series connection to a first resistor and a second resistor. The second resistor has a resistance value which corresponds to a threshold value for the impedance of the protective conductor. A second voltage divider includes a series connection to a third resistor and a bridge diode and a connection to the first resistor at a first end of the third resistor and connectable to a second end of the third resistor and to the protective conductor. A measuring device is provided for the detection of a bridge voltage between a first node and a second node if the impedance of the protective conductor is greater than the value of the second resistor.

Claims16

Dependent claims

A monitoring device for monitoring an impedance of a protective conductor, comprising:

a first input terminal;
a second input terminal;
a first resistor;
a second resistor having a resistance value which corresponds to a threshold value for the impedance of the protective conductor;
a third resistor;
a bridge diode;
a first node between the first resistor and the second resistor;
a second node between the third resistor and the bridge diode;
a first voltage divider for connection to a voltage source, comprising:
(a) the first resistor and the second resistor connected in series, and connected
(b) between the first input terminal and the second input terminal;
a second voltage divider, comprising:
(a) the third resistor and the bridge diode connected in series,
(b) a first end of the third resistor connected to the first,
(c) a second end of the third resistor connected to the protective conductor;
and
a measuring device:
(a) for detecting a bridge voltage between the first node and the second node when the impedance of the protective conductor is greater than the resistance value of the second resistor, and
(b) connected between the first node and the second node.

16 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/354,806Filed 15 Mar 2019 · continuation
Priority: 15 Sep 2017
Published: US 2019/0212370 A111 Jul 2019
Granted: 1 Nov 2022
Term ends: Not estimatedThe source records don’t support an estimate.

Classification20 codes

G01R 17/105
AC or DC measuring bridges: for measuring impedance or resistance
B60L 53/18
Conductive energy transfer: cables specially adapted for charging electric vehicles
B60L 53/62
Monitoring or controlling charging stations: in response to charging parameters, e.g. current, voltage or electrical charge
G01R 15/04
Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00: voltage dividers