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A converter output filter for an induction drive system is provided. The converter output filter (40) comprises an L-R-C network (41) that can be coupled between each converter output (38a, 38b, and 38c) of a converter (16b) and a DC-link midpoint node (35) of the converter (16b). Each L-R-C network (41) comprises an inductive element (42a, 42b, and 42c), a resistive element (44a, 44b, and 44c), and a capacitive element (46a, 46b, and 46c) coupled in series. An electrical device (18) can be coupled to the L-R-C network (41) between the respective inductive element (42a, 42b, and 42c) and the respective resistive element (44a, 44b, and 44c).

Inventors: Prasad Enjeti, Dudi Rendusara, Annette von Jouanne
Original Assignee: The Texas A&M University System
Current U.S. Classification: 363/47
International Classification: H02M 112

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Citations

Cited PatentFiling dateIssue dateOriginal AssigneeTitle
US4967334Sep 12, 1989Oct 30, 1990Sundstrand CorporationInverter input/output filter system
US5111373Jan 29, 1991May 5, 1992Kabushiki Kaisha ToshibaPWM-controlled power supply including choke coil with 3-windings
US5315497Nov 7, 1991May 24, 1994Premier Power, Inc.Symmetrical universal AC-AC power conditioner
US5654591Nov 21, 1994Aug 5, 1997Schneider Electric SAUninterruptible power supply with passing neutral, comprising a twin step-up chopper
US5661390Jun 23, 1995Aug 26, 1997Electric Power Research Institute, Inc.Inverter-fed motor drive with EMI suppression

Referenced by

Citing PatentFiling dateIssue dateOriginal AssigneeTitle
US6377479Sep 12, 2000Apr 23, 2002Hitachi, Ltd.Power conversion system
US6614991Aug 15, 2001Sep 2, 2003Diehl AKO Stiftung & Co. KGInverter-fed three-phase motor for household appliance, especially for the direct drive of washing machines
US6879500Aug 19, 2003Apr 12, 2005The University of Hong KongApparatus for noise current reduction in power converters
US7084604Sep 9, 2005Aug 1, 2006ABB OySpeed sensorless control of an induction machine using a PWM inverter with output LC filter
US7589984Jan 23, 2007Sep 15, 2009ABB OYMethod for starting pulse width modulation
US7602136Dec 18, 2007Oct 13, 2009Power Conservation, Ltd.Mitigation of harmonic currents and conservation of power in non-linear load systems
US7606052Mar 14, 2003Oct 20, 2009Tokyo Institute of TechnologyFilter device
US7902788Oct 12, 2009Mar 8, 2011Power Conservation, Ltd.Mitigation of harmonic currents and conservation of power in non-linear load systems

Claims

1. A converter output filter comprising:

an L-R-C network coupled between each converter output of a converter and a DC-link midpoint node of the converter;
wherein the L-R-C network comprises an inductive element, a resistive element, and a capacitive element coupled in series; and
an electrical device is operable to be coupled to the L-R-C network between the inductive element and the resistive element.

2. The converter output filter of claim 1, wherein the electrical device is an induction motor.

3. The converter output filter of claim 1, wherein the inductive element has an inductance in the range of 160 .mu.H to 350 .mu.H, the capacitive element has a capacitance in the range of 20 nF to 130 nF, and the resistive element has a resistance in the range of 100 .OMEGA. to 300 .OMEGA..

4. The converter output filter of claim 1, wherein the inductive element has an inductance in the range of 330 .mu.H to 400 .mu.H, the capacitive element has a capacitance in the range of 40 nF to 140 nF, and the resistive element has a resistance in the range of 100 .OMEGA. to 300 .OMEGA..

5. The converter output filter of claim 1, wherein the inductive element has an inductance in the range of 800 .mu.H to 1,000 .mu.H, the capacitive element has a capacitance in the range of 100 nF to 650 nF, and the resistive element has a resistance in the range of 100 .OMEGA. to 300 .OMEGA..

6. The converter output filter of claim 1, wherein the converter is a pulse-width modulated inverter.

7. An induction drive system comprising:

a converter comprising a DC-link midpoint node and a converter output;
a converter output filter comprising an inductive element, a capacitive element, and a resistive element coupled in series, the converter output filter coupled between the converter output and the dc-link midpoint node; and
an electrical device coupled to the converter output filter.

8. The induction drive system of claim 7, wherein the electrical device is an induction motor.

9. The induction drive system of claim 7, wherein the inductive element has an inductance in the range of 160 .mu.H to 350 .mu.H, the capacitive element has a capacitance in the range of 20 nF to 130 nF, and the resistive element has a resistance in the range of 100 .OMEGA. to 300 .OMEGA..

10. The induction drive system of claim 7, wherein the inductive element has an inductance in the range of 330 .mu.H to 400 .mu.H, the capacitive element has a capacitance in the range of 40 nF to 140 nF, and the resistive element has a resistance in the range of 100 .OMEGA. to 300 .OMEGA..

11. The induction drive system of claim 7, wherein the inductive element has an inductance in the range of 800 .mu.H to 1,000 .mu.H, the capacitive element has a capacitance in the range of 100 nF to 650 nF, and the resistive element has a resistance in the range of 100 .OMEGA. to 300 .OMEGA..

12. The induction drive system of claim 7, wherein the converter is a pulse-width modulated inverter.

13. A method of reducing differential and common mode dv/dt in an induction drive system, the method comprising:

providing a converter comprising a DC-link midpoint node and at least one converter output;
coupling a converter output filter between the converter output and the DC-link midpoint node, the converter output filter having an associated inductance, resistance, and capacitance, the associated inductance, resistance, and capacitance selected to reduce the differential and common mode dv/dt in the induction drive system; and
coupling an electrical device to the converter output filter.

14. The method of claim 13, wherein the converter output filter comprises an inductive element, a capacitive element, and a resistive element coupled in series.

15. The method of claim 13, wherein the electrical device is an induction motor.

16. The method of claim 13, wherein the inductance is in the range of 160 .mu.H to 350 .mu.H, the capacitance is in the range of 20 nF to 130 nF, and the resistance is in the range of 100 .OMEGA. to 300 .OMEGA..

17. The method of claim 13, wherein the inductance is in the range of 330 .mu.H to 400 .mu.H, the capacitance is in the range of 40 nF to 140 nF, and the resistance is in the range of 100 .OMEGA. to 300 .OMEGA..

18. The method of claim 13, wherein the inductance is in the range of 800 .mu.H to 1,000 .mu.H, the capacitance is in the range of 100 nF to 650 nF, and the resistance is in the range of 100 .OMEGA. to 300 .OMEGA..

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