Surge protection circuit and method for testing a surge protection circuit

Patent metadata

Field	Value
Publication number	US-9500699-B2
Application number	US-201214000948-A
Country	US
Kind code	B2
Filing date	Feb 21, 2012
Priority date	Feb 24, 2011
Publication date	Nov 22, 2016
Grant date	Nov 22, 2016

Abstract

A surge protection circuit, method, computer readable medium, and use, including: at least one first electronic component having a non-linear characteristic, electrically conductively connected between a tapping point, to which a supply potential is appliable, and a node point; at least one second electronic component having a non-linear characteristic, electrically conductively connected between a tapping point, to which a ground potential is appliable, and the node point; a resistor connected between the node point and a control connection; and a monitoring unit to apply a predetermined voltage to the control connection or to output a predetermined current via the control connection and to detect a voltage/potential at the node point in response thereto, the monitoring unit being configured to identify a malfunction in the surge protection circuit when the detected voltage or the detected potential is not related to an expected voltage or expected potential in a predetermined manner.

First claim

The invention claimed is:

1. A surge protection circuit, comprising:
at least one first electronic component having a non-linear characteristic, and which is electrically conductively connected between a tapping point, to which a supply potential is appliable, and a node point, wherein the first electronic component includes a diode, a cathode of the diode being connected to the tapping point to which the supply potential is appliable, and an anode of the diode being connected to the node point;
at least one second electronic component having a non-linear characteristic, and which is electrically conductively connected between a tapping point, to which a ground potential is appliable, and the node point;
a resistor connected between the node point and a control connection; and
a monitoring unit to apply a predetermined voltage to the control connection or to output a predetermined current via the control connection and to detect a voltage or a potential at the node point in response to this, wherein the control connection is an output of the monitoring unit, and wherein the monitoring unit is configured to identify a malfunction in the surge protection circuit when the detected voltage or the detected potential is not related to an expected voltage or an expected potential in a predetermined manner.

2. The surge protection circuit of claim 1 , wherein the diode of the first electronic component includes a zener diode.

3. The surge protection circuit of claim 1 , wherein the second electronic component includes a diode.

4. The surge protection circuit of claim 3 , wherein an anode of the diode of the second electronic component is connected to the node point, and a cathode of the diode of the second electronic component being connected to the tapping point to which the ground potential is appliable.

5. The surge protection circuit of claim 4 , further comprising:
at least a third electronic component having a non-linear characteristic, wherein the third electronic component is electrically conductively connected between the second electronic component and the tapping point to which the ground potential is appliable, wherein the third electronic component includes a diode, an anode of the diode being connected to the second electronic component, and a cathode of the diode being connected to the tapping point to which the ground potential is appliable.

6. The surge protection circuit of claim 3 , wherein the second electronic component includes a zener diode, wherein a cathode of the zener diode is connected to the node point, and an anode of the zener diode is connected to the tapping point to which the ground potential is appliable.

7. A method for testing a surge protection circuit, the method comprising:
applying a predetermined voltage to a control connection of the surge protection circuit or impressing a predetermined current into the control connection, wherein the surge protection circuit includes at least one first electronic component having a non-linear characteristic, and which is electrically conductively connected between a tapping point, to which a supply potential is appliable, and a node point, wherein the first electronic component includes a diode, a cathode of the diode being connected to the tapping point to which the supply potential is appliable, and an anode of the diode being connected to the node point, and wherein the surge protection circuit further includes at least one second electronic component having a non-linear characteristic, and which is electrically conductively connected between a tapping point, to which a ground potential is appliable, and the node point, a resistor connected between the node point and the control connection, and a monitoring unit to apply a predetermined voltage to the control connection or to output a predetermined current via the control connection and to detect a voltage or a potential at the node point in response thereto, wherein the control connection is an output of the monitoring unit;
detecting a voltage or a potential at the node point; and
identifying a malfunction in the surge protection circuit when the detected voltage or the detected potential is not related to an expected voltage or an expected potential in a predetermined manner.

8. A non-transitory computer readable medium having a computer program, which is executable by a processor, comprising:
a program code arrangement having program code for testing a surge protection circuit, by performing the following:
applying a predetermined voltage to a control connection of the surge protection circuit or impressing a predetermined current into the control connection, wherein the surge protection circuit includes at least one first electronic component having a non-linear characteristic, and which is electrically conductively connected between a tapping point, to which a supply potential is appliable, and a node point, wherein the first electronic component includes a diode, a cathode of the diode being connected to the tapping point to which the supply potential is appliable, and an anode of the diode being connected to the node point, and wherein the surge protection circuit further includes at least one second electronic component having a non-linear characteristic, and which is electrically conductively connected between a tapping point, to which a ground potential is appliable, and the node point, a resistor connected between the node point and the control connection, and a monitoring unit to apply a predetermined voltage to the control connection or to output a predetermined current via the control connection and to detect a voltage or a potential at the node point in response thereto, wherein the control connection is an output of the monitoring unit;
detecting a voltage or a potential at the node point; and
identifying a malfunction in the surge protection circuit when the detected voltage or the detected potential is not related to an expected voltage or an expected potential in a predetermined manner.

9. An ABS controller for a utility vehicle, comprising:
a surge protection circuit, including:
at least one first electronic component having a non-linear characteristic, and which is electrically conductively connected between a tapping point, to which a supply potential is appliable, and a node point, wherein the first electronic component includes a diode, a cathode of the diode being connected to the tapping point to which the supply potential is appliable, and an anode of the diode being connected to the node point;
at least one second electronic component having a non-linear characteristic, and which is electrically conductively connected between a tapping point, to which a ground potential is appliable, and the node point;
a resistor connected between the node point and a control connection; and
a monitoring unit to apply a predetermined voltage to the control connection or to output a predetermined current via the control connection and to detect a voltage or a potential at the node point in response to this, wherein the control connection is an output of the monitoring unit, and wherein the monitoring unit is configured to identify a malfunction in the surge protection circuit when the detected voltage or the detected potential is not related to an expected voltage or an expected potential in a predetermined manner.

Assignees

• Feucht Thomas
• Knorr Bremse Systeme Fuer Nutzfahrzeuge Gmbh

Inventors

• Feucht Thomas

Classifications

• H02H9/041

  using a short-circuiting device · CPC title

• G01R31/3277

  of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches · CPC title

• G01R31/2827 Primary

  Testing of electronic protection circuits (testing switches G01R31/327; checking alarm systems G08B29/00; self test of summation current transformers H02H3/335) · CPC title

• G01R31/12

  Testing dielectric strength or breakdown voltage {; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing (G01R31/08, G01R31/327 and G01R31/72 take precedence; measuring in plasmas G01R19/0061; measuring dielectric constants G01R27/2617; ESD, EMC or EMP testing of circuits G01R31/002)} · CPC title

• H02H9/042

  comprising means to limit the absorbed power or indicate damaged over-voltage protection device · CPC title