Dual-mode control of a power generator

• US 8,258,874 B2
• Filed: 12/31/2009
• Issued: 09/04/2012
• Est. Priority Date: 12/31/2008
• Status: Active Grant

• Current Assignee: AES Global Holdings Pte Ltd. (Advanced Energy Industries, Inc. (China))
• Original Assignee: Advanced Energy Industries Incorporated
• Inventors: Van Zyl, Gideon
• Primary Examiner(s): NGUYEN, HIEU P
• Application Number:
  US12/650,652
• Publication Number:
  US 20100168932A1
• Time in Patent Office: 978 Days
• Field of Search: 330/285, 330/296, 330/127, 330/129, 330/134, 330/279
• US Class Current: 330/297
• CPC Class Codes: H02P 9/04 Control effected upon non-electric prime mover and dependent upon electric output value of the generator

Abstract

An improved method and apparatus for managing an application of power with a power generator to a load, the apparatus comprising a power generator configured to apply power to the load; a controller coupled to the power generator, the controller configured to control a plurality of parameters to optimize operational performance of the power system in response to indicia of operational performance of the power system; and a performance assessor, coupled to the power generator and coupled to the controller, the performance assessor configured to provide the indicia of operational performance of the power system to the controller, where the indicia of the operational performance are relative to a plurality of metrics indicative of operational efficiency of the power system.

Claims

1. A power system for applying power to a load, comprising:

a power generator configured to apply power to the load based upon a power set point that is indicative of a level of power to be applied to the load;

a controller coupled to the power generator, the controller configured to control a rail voltage signal and a gate bias signal, where the controller controls both the rail voltage signal and the gate bias signal to maintain the power set point, and also improve operational performance of the power system in response to indicia of operational performance of the power system, and the controller increases the gate bias signal to maintain the power set point when the level of the power that is applied to the load drops below the power set point; and

a performance assessor, coupled to the power generator and coupled to the controller, the performance assessor configured to provide the indicia of operational performance of the power system to the controller, where the indicia of the operational performance are relative to a plurality of metrics indicative of operational efficiency of the power system.

2. The power system of claim 1 wherein the power generator comprises a power amplifier configured to receive the rail voltage signal and to receive the gate bias signal.

3. The power system of claim 2 wherein the power amplifier comprises a field effect transistor.

4. The power system of claim 2 wherein the controller delivers the rail voltage signal and the gate bias voltage signal to the power amplifier.

5. The power system of claim 1 wherein the controller comprises a gate bias voltage controller and a rail voltage controller.

6. The power system of claim 1 where the plurality of metrics indicative of operational efficiency of the power system comprise delivered power and dissipated power.

7. The power system of claim 1 wherein one of the plurality of metrics indicative of operational efficiency of the power system is selected from the following group of metrics:

delivered power, forward power, reflected power, minimum reflected power, maximum delivered power, and current drain from a DC power supply, and another of the plurality of metrics indicative of operational efficiency of the power system is dissipated power.

8. The power system of claim 1 wherein the controller is further configured to receive user input indicative of a desired performance parameter.

9. The power system of claim 1 wherein the controller is further configured to receive user input indicative of a plurality of desired performance parameters.

10. A power generation system for applying power to a load, comprising:

a power generator configured to apply power to the load, the power generator including a power amplifier configured to receive a rail voltage signal and to receive a gate bias signal;

a controller coupled to the power generator, the controller configured to control both the rail voltage signal and the gate bias voltage signal to the power amplifier to reach and maintain a power set point, the controller further configured to optimize, while maintaining the power set point, operational performance of the power system in response to a set of indicia of the operational performance of the power system, and the controller increases the gate bias voltage signal to maintain the power set point when the level of the power that is applied to the load drops below the power set point; and

a performance assessor, coupled to the power generator and coupled to the controller, the performance assessor configured to deliver the set of indicia of the operational performance of the power system to the controller, where the indicia of the operational performance comprise a plurality of metrics indicative of operational efficiency of the power system.

11. The power generation system of claim 10 wherein the power amplifier comprises a field effect transistor.

12. The power generation system of claim 10 wherein the controller comprises a gate bias voltage controller and a rail voltage controller.

13. The power generation system of claim 10 wherein the controller is further configured to receive user input indicative of a desired performance parameter.

14. A method for managing an application of power from a power system to a load, the method comprising:

receiving a plurality of performance parameters from a user of the power system;

receiving a set point for a particular power level to be applied to the load;

controlling a gate bias voltage and a rail voltage to reach and maintain the particular power level while optimizing operational performance of the power system relative to the plurality of the received performance parameters; and

increasing the gate bias voltage to maintain the particular power level applied to the load when the power that is applied to the load drops below the particular power level.

15. The method of claim 14 wherein receiving a plurality of performance parameters from a user of the power system comprises receiving required delivered power, maximum reflected power, and maximum drain current.

16. The method of claim 15 wherein controlling a gate bias voltage relative to a plurality of the received performance parameters further comprises:

measuring delivered power, reflected power and drain current;

calculating a first gate bias adjustment to achieve the required delivered power;

calculating a second gate bias adjustment to achieve the maximum reflected power;

calculating a third gate bias adjustment to achieve a maximum drain current; and

adjusting the gate bias voltage by the minimum of the first, second and third calculated gate bias adjustments.

17. The method of claim 16 wherein receiving a plurality of performance parameters from a user of the power system comprises receiving maximum dissipated power, minimum dissipated power, minimum gate bias voltage, and minimum rail voltage.

18. The method of claim 17 wherein controlling a rail voltage relative to a plurality of the received performance parameters further comprises:

measuring the gate bias voltage and measuring a dissipated power;

comparing the measured dissipated power with the maximum dissipated power, and if the measured dissipated power is greater than the maximum dissipated power, then;

calculating an adjustment of the rail voltage based on the difference between the measured dissipated power and the maximum dissipated power;

calculating an adjustment of the rail voltage based on the previous rail voltage; and

adjusting the rail voltage by the minimum of the two calculated adjustments.