Self-tripping explosive fuse

Patent metadata

Field	Value
Publication number	US-10826284-B2
Application number	US-201815952414-A
Country	US
Kind code	B2
Filing date	Apr 13, 2018
Priority date	May 24, 2017
Publication date	Nov 3, 2020
Grant date	Nov 3, 2020

Abstract

A method for operating a protective apparatus and a protective apparatus, in particular a self-tripping explosive fuse, wherein the protective apparatus includes a fuse element, which is designed to interrupt a conductor section by an explosion. A tripping unit is designed to trip the explosion by an ignition voltage (UZ) when the ignition voltage exceeds a prescribed value. The protective apparatus has a thermoelectric element, which generates the ignition voltage (UZ) depending on heating of the conductor section.

First claim

What is claimed is:

1. A protective apparatus comprising:
a fuse element configured to interrupt a conductor section by means of an explosion,
a tripping unit configured to trip the explosion by an ignition voltage (U Z ) when the ignition voltage (U Z ) exceeds a prescribed value, and
a thermoelectric element which is arranged adjacent the conductor section of the fuse element for sensing heat emitted by the conductor section and generates and then conducts the ignition voltage (U Z ) to the tripping unit depending on heating of the conductor section.

2. The protective apparatus as claimed in claim 1 , wherein the conductor section is DC-isolated from the fuse element and the tripping unit.

3. A protective apparatus comprising:
a fuse element configured to interrupt a conductor section by means of an explosion,
a tripping unit configured to trip the explosion by an ignition voltage (U Z ) when the ignition voltage (U Z ) exceeds a prescribed value, and
a thermoelectric element which generates the ignition voltage (U Z ) depending on heating of the conductor section,
wherein the thermoelectric element generates a first voltage (U 1 ) depending on the heating of the conductor section, and wherein the protective apparatus has an amplifier circuit, which is configured to amplify the first voltage (U 1 ) for generating the ignition voltage (U Z ).

4. The protective apparatus as claimed in claim 3 , wherein the protective apparatus comprises a voltage supply for supplying the amplifier circuit with voltage.

5. The protective apparatus as claimed in claim 4 , wherein the amplifier circuit is configured to amplify the first voltage (U 1 ) to generate a second voltage (U 2 ), wherein the protective apparatus has a series circuit composed of the tripping unit and a Zener diode, across which Zener diode the second voltage (U 2 ) is dropped, wherein the Zener diode is arranged in a reverse direction with respect to the second voltage (U 2 ), with the result that a current flows through the Zener diode and through the tripping unit only when the second voltage (U 2 ) exceeds a prescribed voltage value.

6. The protective apparatus as claimed in claim 5 , wherein the protective apparatus comprises a capacitor, which is arranged in parallel connection with the series circuit.

7. The protective apparatus as claimed in claim 6 , wherein the protective apparatus comprises a parallel resistor, which is arranged in a parallel connection with the series circuit and with the capacitor.

8. The protective apparatus as claimed in claim 7 , wherein the parallel resistor is configured to be set in a variable manner.

9. The protective apparatus as claimed in claim 1 , wherein the tripping unit has a first contact, which is electrically conductively connected to a first tripping contact, wherein the tripping unit has a second contact, which is electrically conductively connected to a second tripping contact, wherein the ignition voltage (U Z ) is dropped between the first contact and the second contact.

10. A method for operating a protective apparatus, comprising:
interrupting a conductor section of a fuse element by means of an explosion generated by a tripping unit when an ignition voltage (U Z ) for tripping the explosion exceeds a prescribed value,
generating the ignition voltage (U Z ) using a thermoelectric element arranged adjacent the conductor section of the fuse element depending on heating of the conductor section, and
conducting the ignition voltage (U Z ) from the thermoelectric element to the tripping unit for generating the explosion.

11. The method of claim 10 , wherein the thermoelectric element generates a first voltage (U 1 ) depending on the heating of the conductor section, and an amplifier circuit of the protective apparatus amplifies the first voltage (U 1 ) for generating the ignition voltage (U Z ).

Assignees

• Porsche Ag

Inventors

• Zacher Marcus

Classifications

• H01H39/006 Primary

  Opening by severing a conductor · CPC title

• H01H71/14

  Electrothermal mechanisms {(combined with a electro-thermal time delay relay H01H61/002)} · CPC title

• H02H3/085 Primary

  making use of a thermal sensor, e.g. thermistor, heated by the excess current (also responsive to the temperature of the protected device H02H5/041, thermal images H02H6/00) · CPC title

• H01H85/0241

  Structural association of a fuse and another component or apparatus (switches with built-in fuses H01H9/10, spark-gap arresters H01H85/44, transformers and inductances H01F27/402, capacitors H01G2/14, lamps H01K1/66, semiconductors H10W20/493 or H10W42/80) · CPC title

• H02H5/04 Primary

  responsive to abnormal temperature {(specially adapted for electric machines H02H7/0852)} · CPC title