System and method for controlling the output voltage of a power supply

• US 8,232,792 B2
• Filed: 08/13/2010
• Issued: 07/31/2012
• Est. Priority Date: 08/13/2010
• Status: Active Grant

• Current Assignee: Lear Corporation
• Original Assignee: Lear Corporation
• Inventors: Hampo, Richard, Sweet, Benjamin D.
• Primary Examiner(s): Laxton, Gary L
• Application Number:
  US12/855,754
• Publication Number:
  US 20120038329A1
• Time in Patent Office: 718 Days
• Field of Search: 323/282, 323/284, 323/285, 323/286, 323/351
• US Class Current: 323/351
• CPC Class Codes: H02J 1/06 Two-wire systems
• CPC Class Codes: H02M 1/0019 the disturbance parameters being load current fluctuations

Abstract

A system and method for controlling the output voltage of a power supply that includes a control section and an interconnect section having an output point. A voltage regulator provides a control section voltage, and a current measurement device measures a control section current and generates a current signal. A controller receives the current signal and a voltage command signal representing a desired output voltage at the output point of the interconnect section. The controller generates an adjusted voltage command signal based on the voltage command signal representing the desired output voltage, the current signal, a control section internal resistance and an interconnect section external resistance. The voltage regulator receives the adjusted voltage command signal and provides a control section voltage based thereon in order to supply an output voltage at the output point that is substantially equal to the desired output voltage.

Claims

1. A system for controlling an output voltage of a power supply comprising a control section and an interconnect section having an output point, the system comprising:

a voltage regulator for providing a control section voltage;

a current measurement device for measuring a control section current and generating a current signal representative thereof; and

a controller for (i) receiving the control section current signal and a voltage command signal representing a desired output voltage at the output point of the interconnect section, and (ii) generating an adjusted voltage command signal based on the voltage command signal representing the desired output voltage, the current signal, a control section internal resistance and an interconnect section external resistance;

wherein the voltage regulator receives the adjusted voltage command signal and provides a control section voltage based thereon in order to supply an output voltage at the output point that is substantially equal to the desired output voltage.

2. The system of claim 1 wherein the controller is further for (iii) predicting an expected output voltage of the power supply at the output point based on the adjusted voltage command signal, the current signal, the internal resistance and the external resistance, and (iv) generating a reported output voltage signal representative of the expected output voltage of the power supply at the output point.

3. The system of claim 2 further comprising a voltage measurement device for measuring a control section voltage, and wherein the controller is further for performing a diagnostic function based on a comparison of the predicted output voltage and the measured control section voltage.

4. The system of claim 1 further comprising a temperature measurement device for measuring a control section temperature and generating a temperature signal representative thereof, and wherein the controller is further for determining the control section internal resistance and the interconnect section external resistance based on the control section temperature measurement signal, a control section internal wire resistance, an interconnect section external wire resistance, and a calibration factor based on the control section wire length and the interconnect section wire length.

5. The system of claim 4 wherein the controller is further for determining a temperature adjustment factor for adjusting the temperature measurement signal representing the measured control section temperature.

6. The system of claim 1 wherein the controller samples the control section current signal.

7. The system of claim 6 wherein the controller samples the control section current signal at periodic time intervals that may be varied.

8. A method for controlling an output voltage of a power supply comprising a control section and an interconnect section having an output point, the method comprising:

receiving a voltage command representing a desired output voltage at the output point of the interconnect section;

generating an adjusted voltage command based on the voltage command representing the desired output voltage, a control section current, a control section internal resistance and an interconnect section external resistance; and

providing a control section voltage based on the adjusted voltage command in order to supply an output voltage at the output point that is substantially equal to the desired output voltage.

9. The method of claim 8 further comprising:

predicting an expected output voltage of the power supply at the output point based on the adjusted voltage command, the control section current, the internal resistance and the external resistance; and

generating a reported output voltage signal representative of the expected output voltage of the power supply at the output point.

10. The method of claim 9 further comprising:

measuring a control section voltage; and

performing a diagnostic function based on a comparison of the predicted output voltage and the measured control section voltage.

11. The method of claim 8 further comprising:

measuring a control section temperature; and

determining the control section internal resistance and the interconnect section external resistance based on the measured control section temperature, a control section internal wire resistance, an interconnect section external wire resistance, and a calibration factor based on the control section wire length and the interconnect section wire length.

12. The method of claim 11 further comprising determining a temperature adjustment factor for adjusting the measured control section temperature.

13. The method of claim 8 wherein the control section current is sampled.

14. The method of claim 13 wherein the control section current is sampled at periodic time intervals that may be varied.

15. A non-transitory computer readable medium having computer executable instructions stored thereon for controlling an output voltage of a power supply comprising a control section and an interconnect section having an output point, the computer executable instructions comprising instructions for:

receiving a current signal representative of a control section current;

receiving a voltage command signal representing a desired output voltage at the output point of the interconnect section;

generating an adjusted voltage command signal based on the voltage command signal representing the desired output voltage, the current signal, a control section internal resistance and an interconnect section external resistance; and

providing a control section voltage control signal based on the adjusted voltage command signal, the control signal for use in supplying an output voltage at the output point that is substantially equal to the desired output voltage.

16. The computer readable medium of claim 15 further comprising computer executable instructions for:

predicting an expected output voltage of the power supply at the output point based on the adjusted voltage command signal, the current signal, the internal resistance and the external resistance; and

generating a reported output voltage signal representative of the expected output voltage of the power supply at the output point.

17. The computer readable medium of claim 16 further comprising computer executable instructions for performing a diagnostic function based on a comparison of the predicted output voltage and a measured control section voltage.

18. The computer readable medium of claim 15 further comprising computer executable instructions for determining the control section internal resistance and the interconnect section external resistance based on a control section temperature measurement signal, a control section internal wire resistance, an interconnect section external wire resistance, and a calibration factor based on the control section wire length and the interconnect section wire length.

19. The computer readable medium of claim 18 further comprising computer executable instructions for determining a temperature adjustment factor for adjusting the control section temperature measurement signal.

20. The computer readable medium of claim 15 wherein the instruction for receiving a current signal representative of a control section current comprises a computer executable instruction for sampling a current signal representative of a control section current.