Back to results
US 12,726,014 B2Granted
Protection circuit for power supply devices, particularly for explosion-proof applications
AssigneePepperl + Fuchs GmbH
InventorCarlo Gattanini
Life of this patent
Estimating the term…
Abstract
A protection circuit for a power converter, particularly for explosion protection applications, includes a series connection of a reverse-polarized Zener diode and a resistor to be coupled between a high and a low potential supply line of the power converter. A semiconductor switch is directly coupled between the high and low potential supply line with its conduction path. A control terminal of the semiconductor switch is coupled with or controlled by a node between the Zener diode and the resistor.
Claims8
A protection circuit for a power converter for explosion-protection applications, comprising:
- a series connection of a reverse-polarized Zener diode and a resistor to be coupled between a high and a low potential supply line of the power converter;
- and
- a semiconductor switch directly coupled between the high and low potential supply line with its conduction path wherein a control terminal of the semiconductor switch is coupled with or controlled by a node between the Zener diode and the resistor;
- wherein the semiconductor switch is a bipolar transistor which is configured to have the control terminal current controlled, wherein the sensitive emitter-basis path through the semiconductor switch is in parallel with the resistor.
1 more element
Dependencies are inferred from the claim text.