Rectifier circuit with current injection
First Claim
1. A rectifier circuit with a three-phase rectifier arrangement of semiconductor valves, preferably a bridge rectifier circuit of diodes, wherein the rectifier arrangement comprises a three-phase mains input and a DC output, and at least one of the three phases at the mains input is connected to a first pole connection of a three-pole circuit for diverting an injection current into the three-pole circuit, wherein each phase can respectively be connected with a switching element to the first pole connection of the three-pole circuit, and a second and third pole connection of the three-pole circuit is respectively connected to an output line of the DC output for control currents, wherein the three-pole circuit comprises controllable semiconductor valves, preferably IGBTs, for the active control of the control currents and/or the injection current, and at least one choke is arranged on one of the output lines at the DC output, and a time-variable load is provided at the DC output, and wherein the second and third pole connection of the three-pole circuit are respectively connected via a second and third inductor to one of the two output lines of the DC output, and the choke is provided between the second or third pole connection and the load.
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Accused Products
Abstract
The present invention relates to a rectifier circuit with a three-phase rectifier arrangement (1) of semiconductor valves (2), preferably a bridge rectifier circuit of diodes, wherein the rectifier arrangement (1) comprises a three-phase mains input (3) and a DC output (4), and at least one of the three phases (U, V, W) at the mains input (3) is connected to a first pole connection (A) of a three-pole circuit (5) for diverting an injection current (ih3) into the three-pole circuit (5). It is provided in accordance with the invention that each phase (U, V, W) can respectively be connected with a switching element (S1, S2, S3) to the first pole connection (A) of the three-pole circuit (5), and a second and third pole connection (B, C) of the three-pole circuit (5) is respectively connected to an output line (PDC,NDC) of the DC output (4) for control currents (icp,icn), wherein the three-pole circuit (5) comprises controllable semiconductor valves (Scp+,Scp−,Scn+,Scn−), preferably IGBTs, for the active control of the control currents (icp,icn) and/or the injection current (ih3), and at least one choke (7) is arranged on one of the output lines (PDC,NDC) at the DC output (4), and a time-variable load (6) is provided at the DC output (4).
9 Citations
23 Claims
- 1. A rectifier circuit with a three-phase rectifier arrangement of semiconductor valves, preferably a bridge rectifier circuit of diodes, wherein the rectifier arrangement comprises a three-phase mains input and a DC output, and at least one of the three phases at the mains input is connected to a first pole connection of a three-pole circuit for diverting an injection current into the three-pole circuit, wherein each phase can respectively be connected with a switching element to the first pole connection of the three-pole circuit, and a second and third pole connection of the three-pole circuit is respectively connected to an output line of the DC output for control currents, wherein the three-pole circuit comprises controllable semiconductor valves, preferably IGBTs, for the active control of the control currents and/or the injection current, and at least one choke is arranged on one of the output lines at the DC output, and a time-variable load is provided at the DC output, and wherein the second and third pole connection of the three-pole circuit are respectively connected via a second and third inductor to one of the two output lines of the DC output, and the choke is provided between the second or third pole connection and the load.
- 17. A method for impressing control currents into a DC output of a rectifier circuit with a three-phase rectifier arrangement of semiconductor valves, preferably a three-pole bridge rectifier circuit of diodes, wherein an injection current is diverted from at least one of the three phases at a mains input of the rectifier circuit, wherein the injection current is supplied to a first pole connection of a three-pole circuit, and the control of the injection current and/or the control currents occurs via active components, preferably controllable semiconductor valves, in the three-pole circuit, and the rectifier currents in two DC output lines are added the control currents via a second and third pole connection of the three-pole circuit, and are guided at least through one choke arranged on the DC output, and wherein the injection current and/or the control currents are conducted through at least two of three inductors, provided on at least two of the three pole connections for smoothing and controlling the currents, by differential voltages via the inductors, and the third current is set via control of two of the three currents.
Specification