Charging current method, charging current device, and electronic converter with the charging current device
AssigneeSiemens Aktiengesellschaft
InventorBenno Weis
Life of this patent
Estimating the term…
Abstract
In a charging current method for limiting a charging current in a DC voltage circuit, the charging current is conducted from an electric supply grid into the DC voltage circuit via diodes. A DC voltage of the DC voltage circuit is ascertained and is based on the supply voltage of the electric supply grid. A variable undervoltage threshold on the DC voltage circuit is determined and a limit of the charging current is activated when the DC voltage reaches or falls below the variable undervoltage threshold.
Claims13
A charging current method for limiting a charging current in a DC voltage circuit, the charging current method comprising:
- conducting the charging current from an electric supply grid into the DC voltage circuit via diodes;
- ascertaining a DC voltage on the DC voltage circuit, with the DC voltage being dependent on a supply voltage of the electric supply grid;
- determining and updating a variable undervoltage threshold on the DC voltage circuit when the ascertained DC voltage embodied as an averaged DC voltage increases over a time period;
- and
- activating the limiting of the charging current when the DC voltage reaches or falls below the variable undervoltage threshold.
A charging current device for limiting a charging current, the charging current device comprising:
- a DC voltage circuit;
- a plurality of diodes connectable to an electric supply grid and connected to the DC voltage circuit, with the charging current capable of being conducted via the diodes from the electric supply grid Into the DC voltage circuit;
- and
- a processor unit designed to ascertain a DC voltage on the DC voltage circuit, with the DC voltage being dependent on a supply voltage of the electric supply grid, for determining and updating a variable undervoltage threshold on the DC voltage circuit by an increase checking function when the ascertained DC voltage increases over a time period, and for activating the limiting of the charging current when the DC voltage reaches or falls below the variable undervoltage threshold.
An electric converter, comprising:
- a charging current device comprising a DC voltage circuit, a DC voltage circuit, a plurality of diodes connectable to an electric supply grid and connected to the DC voltage circuit, with a charging current capable of being conducted via the diodes from the electric supply grid into the DC voltage circuit, and a processor unit designed to ascertain a DC voltage on the DC voltage circuit, with the DC voltage being dependent on a supply voltage of the electric supply grid, for determining and updating a variable undervoltage threshold on the DC voltage circuit by an increase checking function when the ascertained DC voltage increases over a time period, and for activating the limiting of the charging current when the DC voltage reaches or falls below the variable undervoltage threshold;
- and
- an electric machine electrically connectable to the DC voltage circuit and operatable on the electric supply grid via the diodes and the DC voltage circuit.
Dependencies are inferred from the claim text.