Nova Patents
EP0802617A2

Electronic power circuit device

Abstract

The circuit has a first power converter (1) connected via a first intermediate d.c. circuit (3) to a first intermediate circuit voltage and via a first rectifier (2) to a power supply network (4). The converter has at least one load connection (5), to which can be switched either the positive or negative intermediate circuit voltage or zero volts. At least one further converter (6) has a second intermediate d.c. circuit (7) and a second intermediate circuit voltage and is connected in series with each load connection of the first converter and a load (8). The positive or negative second intermediate voltage or zero volts can be selectively added to a voltage switched from the first converter to its load connection (5).

EP0802617A2, drawing sheet 1
Sheet 1 of 3

Term

Term ended

Projected expiry passed 27 March 2017, 9.5 years ago.

  1. Priority
  2. Filed
  3. Published
  4. Projected expiry
  5. Today

10 claims: 2 independent, 8 dependent

  1. c-de-0001
    Power electronic circuitry comprising:- A first power converter (1), via a first direct-voltage intermediate circuit (3), with a first intermediate circuit voltage Uzk1, and a first rectifier (2) to a power supply network (4) is connected and the at least one load terminal (5), wherein optionally the positive first DC voltage + Uzk1 or negative - can be Uzk1 or optionally 0V connected to the or each load terminal (5);characterized in that - At least one second power converter (6) is provided, having a second DC voltage intermediate circuit (7) having a second intermediate circuit voltage Uzk2 and to the or each load terminal (5) of the first converter (1) is connected and a load (8) upstream of such that optionally at least the positive second intermediate circuit voltage + Uzk2 or the negative second intermediate circuit voltage -Uzk2 or possibly 0V to the first power converter (1) at the load terminal (5) switched voltage value can be added.
  2. c-de-0004
    Circuit arrangement according to one of claims 2 or 3, characterized in that the or each second converter (6) by a second rectifier (12) fed bridge circuit with a first and a second bridge branch and corresponding to a first and a second bridge connection (9 and 10 ), wherein the first bridge connection (9) with a load terminal (5) of the first converter and the second bridge connection (10) is connected to the load (8).
  3. c-de-0008
    Circuit arrangement according to one of the preceding claims, characterized in that the second rectifier (12) via a transformer (13) to the power supply network (4) is connected.
  4. c-de-0009
    Circuit arrangement according to one of claims 1 to 8, characterized in that the second converter (6) is operated pulse-width modulated.
  5. c-de-0010
    Circuit arrangement according to one of claims 4 to 9, characterized in that the first rectifier (2) and the second rectifier (12) according to the kind of converter bridge are constructed, and that the second rectifier (12) is driven so that harmonics in the network ( 4) to be compensated.
Independent claims5