Systems and methods for controlling a converter for powering a load

• US 8,050,063 B2
• Filed: 08/04/2008
• Issued: 11/01/2011
• Est. Priority Date: 05/31/2007
• Status: Expired due to Fees

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Wagoner, Robert Gregory, Ritter, Allen
• Primary Examiner(s): Berhane; Adolf
• Assistant Examiner(s): PHAM, EMILY P
• Application Number:
  US12/185,534
• Publication Number:
  US 20080304302A1
• Time in Patent Office: 1,184 Days
• Field of Search: 363/39, 363/56.02, 363/56.03, 363/56.04, 363/56.05, 363/131, 363/132, 318/599, 318/800
• US Class Current: 363/56.02
• CPC Class Codes: H02M 7/48 using discharge tubes with control electrode or semiconductor devices with control electrode
• CPC Class Codes: H02M 7/483 Converters with outputs that each can have more than two voltages levels
• CPC Class Codes: H02M 7/53871 with automatic control of output voltage or current
• CPC Class Codes: H02P 23/0086 specially adapted for high speeds, e.g. above nominal speed
• CPC Class Codes: H02P 27/04 using variable-frequency supply voltage, e.g. inverter or converter supply voltage
• CPC Class Codes: H02P 27/08 with pulse width modulation
• CPC Class Codes: H02P 27/12 pulsing by guiding the flux vector, current vector or voltage vector on a circle or a closed curve, e.g. for direct torque control

Abstract

Systems and methods for controlling a converter for powering a load are provided. According to one embodiment of the invention, a method for powering a load is provided. A power converter may be provided. At least one gating control signal having a switching pattern may be supplied to the power converter, wherein the switching pattern has a waveform with an effective switching frequency greater than 1 times the fundamental frequency of the switching pattern and less than 2 times the fundamental frequency of the switching pattern. At least one output power signal may be output to the load responsive at least in part to the at least one gating control signal supplied.

Claims

1. A method for powering a load, comprising:

providing a power converter;

supplying at least one gating control signal comprising a switching pattern to the power converter, wherein the switching pattern comprises a waveform comprising an effective switching frequency greater than 1 times the fundamental frequency of the switching pattern and less than 2 times the fundamental frequency of the switching pattern; and

outputting at least one output power signal to the load responsive at least in part to the at least one gating control signal supplied.

2. The method of claim 1, wherein supplying at least one gating control signal comprises supplying at least one gating control signal comprising a switching pattern comprising at least two notches separated by an angle greater than approximately 360 degrees and less than approximately 720 degrees.

3. The method of claim 1, wherein supplying at least one gating control signal comprises supplying at least one dating control signal comprising an effective switching frequency of approximately 1.5 times the fundamental frequency of the switching pattern.

4. The method of claim 1, wherein supplying at least one gating control signal comprises supplying at least one gating control signal comprising a switching pattern comprising at least a first notch and a second notch, wherein the first notch is positioned to occur at a substantially positive slope of a reference voltage of the at least one gating control signal and the second notch is positioned to occur at a substantially negative slope of the reference voltage.

5. The method of claim 1, wherein supplying at least one gating control signal comprises supplying at least one gating control signal comprising a switching pattern comprising a plurality of notches, wherein the positions of the plurality of notches alternate between a substantially positive slope of a reference voltage of the at least one gating control signal and a substantially negative slope of the reference voltage.

6. The method of claim 1, wherein supplying at least one gating control signal comprises supplying a first gating control signal and a second gating control signal to the power converter, each gating control signal comprising a switching pattern comprising at least two notches, and wherein the second gating control signal is phase shifted relative to the first gating control signal.

7. The method of claim 1, wherein the power converter comprises electrical circuitry comprising a first leg and a second leg, and wherein supplying at least one gating control signal comprises supplying a first gating control signal to the first leg and supplying a second gating control signal to the second leg.

8. The method of claim 7, wherein the second gating control signal is phase shifted relative to the first gating control signal.

9. The method of claim 7, wherein the first leg comprises a first semiconductor and the second leg comprises a second semiconductor, and adjusting the position of the notches of each gating control signal to improve at least one of:

(i) the temperature balance between the first semiconductor and the second semiconductor, (ii) the power loss in the first semiconductor and the second semiconductor, or (iii) the harmonic distortion of the output power signal.

10. The method of claim 1, further comprising adjusting the switching pattern of the at least one gating control signal to improve at least one of:

(i) the temperature balance within the power converter, (ii) the power loss within the power converter, or (iii) the harmonic distortion of the output power signal.

11. The method of claim 1, wherein supplying at least one gating control signal comprises supplying at least one gating control signal comprising a switching pattern comprising at least two notches, and further comprising adjusting the separation between the at least two notches to improve at least one of:

(i) the temperature balance within the power converter, (ii) the power loss within the power converter, or (iii) the harmonic distortion of the output power signal.

12. The method of claim 11, wherein the position of a first notch is adjusted to occur at a substantially positive slope of a reference voltage of the at least one gating control signal and the position of a second notch is adjusted to occur at a substantially negative slope of the reference voltage.

13. A system for providing power to a load, comprising:

a voltage source operable to supply a power signal;

a power converter; and

at least one gating controller operable to supply at least one gating control signal comprising a switching pattern to the power converter, wherein the switching pattern comprises a waveform comprising an effective switching frequency greater than 1 times the fundamental frequency of the switching pattern and less than 2 times the fundamental frequency of the switching pattern;

wherein the converter is operable to receive the power signal from the voltage source and output at least one output power signal to the load responsive at least in part to the at least one gating control signal supplied.

14. The system of claim 13, wherein the at least one gating controller is operable to supply a gating control signal comprising a switching pattern comprising at least two notches separated by an angle greater than approximately 360 degrees and less than approximately 720 degrees.

15. The system of claim 13, wherein the at least one gating controller is operable to supply a gating control signal comprising an effective switching frequency of approximately 1.5 times the fundamental frequency of the switching pattern.

16. The system of claim 13, wherein the at least one gating controller is operable to supply at least one gating control signal comprising a switching pattern comprising at least a first notch and a second notch, wherein the first notch is positioned to occur at a substantially positive slope of a reference voltage of the at least one gating control signal and the second notch is positioned to occur at a substantially negative slope of the reference voltage.

17. The system of claim 13, wherein the power converter comprises electrical circuitry comprising a first leg and a second leg, and wherein the at least one gating controller is operable to supply a first gating control signal to the first leg and supplying a second gating control signal to the second leg.

18. The system of claim 17, wherein the first leg comprises a first semiconductor and the second leg comprises a second semiconductor, and wherein the at least one gating controller is operable to adjust the position of the notches of each gating control signal to improve at least one of:

(i) the temperature balance between the first semiconductor and the second semiconductor or (ii) the power loss in the first semiconductor and the second semiconductor.

19. The system of claim 13, wherein the at least one gating controller is operable to adjust the switching pattern of the at least one gating control signal to improve at least one of:

(i) the temperature balance within the power converter, (ii) the power loss within the power converter, or (iii) the harmonic distortion of the output power signal.

20. A method for powering a load, comprising:

providing a three-phase wye-connected H-bridge power converter, wherein each phase of the H-bridge power converter comprises two legs;

supplying an input power signal to the H-bridge power converter;

supplying a different gating control signal comprising a switching pattern to each leg of each phase of the H-bridge power converters wherein each switching pattern comprises a waveform comprising at least a first notch positioned to occur at a substantially positive slope of a reference voltage of the respective gating control signal and a second notch positioned to occur at a substantially negative slope of the reference voltage, the waveform comprising an effective switching frequency greater than 1 times the fundamental frequency of the switching pattern and less than 2 times the fundamental frequency of the switching pattern, wherein the degrees of separation between each notch determines the effective switching frequency; and

outputting at least one output power signal to the load responsive at least in part to the gating control signals supplied.