Method for operating a charger for a voltage-maintaining device, and an apparatus for carrying out the method
First Claim
1. A method for operating a charger (1) for a voltage-maintaining device (2), in which a rectifier (5), connected to phase inputs (PA;
- PB;
PC) via a transformer (3) with an electric AC voltage supply system (4), of the charger (1) is driven by means of a drive signal (S) formed from reference charging voltages (ULA, ref;
ULB, ref;
ULC, ref) a charging voltage (ULA;
ULB;
ULC) for the corresponding phase (A;
B;
C) being generated at each phase input (PA;
PB;
PC), and a substantially constant DC voltage (UDC) being generated on the DC voltage side of the rectifier (5), characterized in that each charging voltage (ULA;
ULB;
. ULC) is generated in such a way that in the corresponding phase (A;
B;
C) a charging current (ILA;
ILB;
ILC) is injected in a fashion substantially proportional to a phase system voltage (UNA, UNB;
UNC) of the corresponding phase (A;
B;
C) of the electric AC voltage supply system (4).
4 Assignments
0 Petitions
Accused Products
Abstract
A method is specified for operating a charger (1) for a voltage-maintaining device (2), in which a rectifier (5), connected to phase inputs (PA, PB; PC) via a transformer (3) with an electric AC voltage supply system (4), of the charger (1) is driven by means of a drive signal (S) formed from reference charging voltages (ULA, ref; ULB, ref; ULC, ref). Furthermore, a charging voltage (ULA; ULB; ULC) for the corresponding phase (A; B; C) is generated at each phase input (PA; PB; PC) a substantially constant DC voltage (UDC) being generated-on the DC voltage side of the rectifier (5). Each charging voltage (ULA; ULB; ULC) is generated in such a way that in the corresponding phase (A; B; C) a charging current (ILA; ILB; ILC) is injected in a fashion substantially proportional to a phase system voltage (UNA; UNB; UNC) of the corresponding phase (A; B; C) of the electric AC voltage supply system (3). An apparatus for carrying out the method is also disclosed.
3 Citations
17 Claims
-
1. A method for operating a charger (1) for a voltage-maintaining device (2), in which a rectifier (5), connected to phase inputs (PA;
- PB;
PC) via a transformer (3) with an electric AC voltage supply system (4), of the charger (1) is driven by means of a drive signal (S) formed from reference charging voltages (ULA, ref;
ULB, ref;
ULC, ref) a charging voltage (ULA;
ULB;
ULC) for the corresponding phase (A;
B;
C) being generated at each phase input (PA;
PB;
PC), and a substantially constant DC voltage (UDC) being generated on the DC voltage side of the rectifier (5), characterized in that each charging voltage (ULA;
ULB;
. ULC) is generated in such a way that in the corresponding phase (A;
B;
C) a charging current (ILA;
ILB;
ILC) is injected in a fashion substantially proportional to a phase system voltage (UNA, UNB;
UNC) of the corresponding phase (A;
B;
C) of the electric AC voltage supply system (4). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- PB;
-
10. An apparatus for carrying out a method for operating a charger (1) for a voltage-maintaining device (2), having a control device (6) which serves to generate reference charging voltages (ULA, ref;
- ULB, ref;
ULC, ref) and is connected via a driving circuit (7) for forming a drive signal (S) from the reference charging voltages (ULA, ref;
ULB, ref;
ULC, ref) to a rectifier (5) of the charger (1), the rectifier (5) generating at each phase input (PA;
PB;
PC) a charging voltage (ULA;
ULB;
ULC) for the corresponding phase (A;
B;
C), and being connected to the phase inputs (PA;
PB;
PC) via a transformer (3) with an electric AC voltage supply system (4) and generating a substantially constant DC voltage (UDC) on its DC voltage side, characterized in that the control device (6) comprises a calculating unit (8) for forming the reference charging voltages (ULA, ref, ULB, ref, ULC, ref), to which phase system voltages (UNA;
UNB;
UNC) of the electric AC voltage supply system (4) are fed on the input side, a phase system voltage (UNA;
UNB;
UNC) being fed respectively to an impedance-matching device (9) of the corresponding phase (A;
B;
C), and a controller unit (10) for generating a reference phase current amplitude value (Î
A, B, C, ref), to which the DC voltage (UDC) and a DC voltage desired value (UDC, soll) are fed, the reference phase current amplitude value (Î
A, B, C, ref) being fed to each impedance-matching device (9) on the input side. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
- ULB, ref;
Specification