Power supply unit for explosion-proof applications
AssigneePepperl + Fuchs GmbH
InventorMartin Jung
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Abstract
The present invention refers to a power supply unit for operating an electronic device in an explosion-proof area, comprising: a means (2) for providing a rectified input voltage (UE); a DC link capacitance (5) for buffering a DC link voltage; a phase section control (4) controlled to apply the rectified input voltage to the DC link capacitance (5) during a time period in which the rectified input voltage (UE) increases and is between a lower (Uu) and upper voltage threshold (Uo), and to disconnect the rectified input voltage from the DC link capacitance (5) in the remaining time periods; a converter circuit (7) configured to convert the DC link voltage (UZ) into an output voltage.
Claims10
A power supply unit for operating an electronic device in an explosion-proof area, comprising:
- a means for providing a rectified input voltage;
- a DC link capacitance for buffering a DC link voltage;
- a phase section control controlled to apply the rectified input voltage to the DC link capacitance during a time period in which the rectified input voltage increases and is between a lower and upper voltage threshold, and to disconnect the rectified input voltage from the DC link capacitance in the remaining time periods to limit the DC link voltage to a voltage below a provided explosion protection voltage limit;
- a converter circuit which is configured to convert the DC link voltage into an output voltage.
Method for operating a power supply unit for operating of an electronic device in an explosion-proof area, wherein the power supply unit has a means for providing a rectified input voltage, a DC link capacitance for buffering a DC link voltage and a converter circuit which is configured to convert the DC link voltage into an output voltage, wherein, during a time period in which the rectified input voltage increases and lies between a lower and upper voltage threshold, the rectified input voltage is applied to the DC link capacitance, and in the remaining time periods the rectified input voltage is disconnected from the DC link capacitance to limit the DC link voltage to a voltage below a provided explosion protection voltage limit.
Dependencies are inferred from the claim text.