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US 2015/0029771 A1Published application
Rectifier circuit with current injection
AssigneeSchneider Electric Power Drives GmbH
InventorsMichael Hartmann, Rudolf Fehringer
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AssigneeSchneider Electric Power Drives GmbH
InventorsMichael Hartmann, Rudolf Fehringer
Estimating the term…
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).
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), wherein 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).
A method for impressing control currents (icp,icn) into a DC output (4) of a rectifier circuit with a three-phase rectifier arrangement (1) of semiconductor valves (2), preferably a three-pole bridge rectifier circuit of diodes, wherein an injection current (ih3) is diverted from at least one of the three phases (U, V, W) at a mains input (3) of the rectifier circuit, wherein the injection current (ih3) is supplied to a first pole connection (A) of a three-pole circuit (5), and the control of the injection current (ih3) and/or the control currents (icp,icn) occurs by means of active components, preferably controllable semiconductor valves (Scp+,Scp−,Scn+,Scn−), in the three-pole circuit (5), and the rectifier currents (ip,in) in two DC output lines (PDC,NDC) are added the control currents (icn,icp) via a second and third pole connection (B, C) of the three-pole circuit (5), and are guided at least through one choke (7) arranged on the DC output (4).
Dependencies are inferred from the claim text.