US 2013/0155564 A1Published application

Intrinsically Safe Energy Limiting Circuit

AssigneeSiemens Aktiengesellschaft

InventorGlen Eugene SCHMIDT

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Abstract

An intrinsically safe energy limiting circuit for connection between an upstream DC power source and a downstream electrical load powered from the upstream DC power source, wherein the circuit comprises from upstream to downstream an input to be connected to the DC power source, an electronic current limiter configured to limit a current through the circuit to a maximum value if the current reaches this value, a fuse designed to open at a current value greater than the maximum value, a DC-to-DC converter configured to convert a DC input voltage to a lower nominal DC output voltage, a zener barrier having a zener voltage higher than the DC output voltage, and an output for connection to the electrical load.

Claims10

Dependent claims

An intrinsically safe energy limiting circuit (1) for connection between an upstream DC power source (2) and a downstream electrical load (3) powered from the upstream DC power source (2), said energy limiting circuit (1) from upstream to downstream comprising:

an input (5) for connection to the upstream DC power source (2);
an electronic current limiter (11) configured to limit a current through the energy limiting circuit to a maximum value if the current reaches the maximum value;
a fuse (10) designed to open at a current value greater than said maximum value;
a DC-to-DC converter (7) configured to convert a DC input voltage to a lower nominal DC output voltage;
a zener barrier (8) having a zener voltage higher than the DC output voltage;
and
an output (6) for connected to the downstream electrical load (3).

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/715,108Filed 14 Dec 2012
Priority: EP EP1119387115 Dec 2011
Published: 20 Jun 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

H02H 9/02
Emergency protective circuit arrangements for limiting excess current or voltage without disconnection: responsive to excess current
H02H 9/008
Emergency protective circuit arrangements for limiting excess current or voltage without disconnection: intrinsically safe circuits
H02H 9/025
Responsive to excess current: current limitation using field effect transistors
H02H
Emergency protective circuit arrangements

Family

US 8,848,332 B2Related patent
US 2013/0155564 A1This patent

From the US filing history. Foreign family members aren’t listed.

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