Converter input/output voltage balancing control
First Claim
1. A method for controlling power valves included in at least one converter forming part of a converter circuit which on its input receives at least two DC input voltages and transmits current pulses respectively corresponding to these DC voltages to a common load via a common output filer, said controlling aiming at keeping the DC voltages equal, comprising the steps of:
- determining a stop time for the current pulses as a function of a difference between the input voltages such that the stop time of current pulses originating from a lower of the at least two input voltages is postponed in relation to the difference;
determining a starting time of the current pulses as a function of the difference between the input voltages such that the starting time for a current pulse originating from a lower of the at least two input voltages is postponed in relation to the difference; and
regulating the input voltages by shifting the respective current pulses with respect to each other essentially without changing widths of the current pulses.
2 Assignments
0 Petitions
Accused Products
Abstract
The invention relates to a method and a circuit arrangement for controlling power valves included in at least one converter (2,4) forming part of a converter circuit which on its input receives at least two DC voltages (U1,U2) and transmits current pulses respectively corresponding to these DC voltages to a common load (RL) via a common output filter (L1,C1), said controlling aiming at keeping the input DC voltages equal.
A control circuit (44) regulates the input voltages by shifting the starting times of the respective current pulses with respect to each other. Preferably, and particularly in continuous operation, the respective current pulses are shifted with respect to each other essentially without changing there widths.
27 Citations
12 Claims
-
1. A method for controlling power valves included in at least one converter forming part of a converter circuit which on its input receives at least two DC input voltages and transmits current pulses respectively corresponding to these DC voltages to a common load via a common output filer, said controlling aiming at keeping the DC voltages equal, comprising the steps of:
-
determining a stop time for the current pulses as a function of a difference between the input voltages such that the stop time of current pulses originating from a lower of the at least two input voltages is postponed in relation to the difference; determining a starting time of the current pulses as a function of the difference between the input voltages such that the starting time for a current pulse originating from a lower of the at least two input voltages is postponed in relation to the difference; and regulating the input voltages by shifting the respective current pulses with respect to each other essentially without changing widths of the current pulses. - View Dependent Claims (2, 3, 4)
-
-
5. A balancing circuit comprising:
-
means for receiving a plurality of input voltages; means for transmitting a plurality of current pulses corresponding to said input voltages; means for shifting said current pulses in time while maintaining a time duration of said current pulses; means for determining a difference between the input voltages and for determining a stop time of the current pulses as a function of a difference between the input voltages such that a stop time of current pulses originating from a lower input voltage is postponed in relation to the difference; and means for determining a starting time of the current pulses as a function of a difference between the input voltages such that the starting time for a current pulse originating from a lower input voltage is postponed in relation to the difference. - View Dependent Claims (6, 7, 8)
-
-
9. A circuit arrangement for controlling power valves included in at least one converter forming part of a converter circuit which has input means for receiving at least two DC input voltages and means for transmitting current pulses respectively corresponding to said DC voltages to a common load via a common output filter said controlling aiming at keeping the DC voltages alike, comprising:
-
means for determining a difference between the input voltages and for determining a stop time of the current pulses as a function of a difference between the input voltages such that the stop time of current pulses originating from a lower input voltage than another one is postponed in relation to the difference; means for determining a starting time of the current pulses as a function of the difference between the input voltages such that the starting time for a current pulse originating from a lower input voltage than another one is postponed in relation to the difference; and a control circuit for regulating the input voltages by shifting the respective current pulses based on said determining means with respect to each other essentially without changing widths of the current pulses. - View Dependent Claims (10, 11, 12)
-
Specification