System and method for generating a drive signal

Patent metadata

Field	Value
Publication number	US-11214476-B2
Application number	US-202016933414-A
Country	US
Kind code	B2
Filing date	Jul 20, 2020
Priority date	Mar 6, 2006
Publication date	Jan 4, 2022
Grant date	Jan 4, 2022

Abstract

A method and computer program product for defining a PWM drive signal having a defined voltage potential. The PWM drive signal has a plurality of “on” portions and a plurality of “off” portions that define a first duty cycle for regulating, at least in part, a flow rate of a pump assembly. At least a portion of the “on” portions of the PWM drive signal are pulse width modulated to define a second duty cycle for the at least a portion of the “on” portions of the PWM drive signal. The second duty cycle regulates, at least in part, the percentage of the defined voltage potential applied to the pump assembly.

First claim

What is claimed is:

1. A pump system comprising:
a pump; and
a pump controller for controlling the flow rate of the pump, the pump controller for generating a pump drive signal having a first voltage and a second voltage potential, the pump drive signal having a first cycle of periodic off times of the first voltage, and a second cycle of periodic on times wherein during the periodic on times the pump drive signal periodically alternates between the first voltage and the second voltage to generate an effective third voltage between the first voltage and the second voltage.

2. The pump system of claim 1 wherein the effective third voltage is one half the potential between the first voltage and the second voltage.

3. The pump system of claim 1 wherein the cycle of periodic off times is about 15 milliseconds.

4. The pump system of claim 1 wherein the cycle of periodic on times is between about 15 and 185 milliseconds.

5. The pump system of claim 3 wherein the cycle of periodic on times is between about 15 and 185 milliseconds.

6. The pump system of claim 1 wherein the periodic on time is between about 7.5% and 50% of the combination of the periodic off time and the periodic on time.

7. The pump system of claim 5 wherein the periodic on time is between about 7.5% and 50% of the combination of the periodic off time and the periodic on time.

8. The pump system of claim 2 wherein the periodic on time is between about 7.5% and 50% of the combination of the periodic off time and the periodic on time.

9. The pump system of claim 1 wherein the voltage potential is between the first voltage and the second voltage is 28 VDC.

10. A method of generating a pump control signal for controlling the flow rate of a pump comprising:
generating an off pump drive signal having a first voltage for a first cycle of periodic off times; and
generating an on pump drive signal for a second cycle of periodic on times wherein during the periodic on times the on pump drive signal periodically alternates between the first voltage and the voltage potential of a second voltage to generate an effective third voltage between the first voltage and the second voltage.

11. The pump control method of claim 10 wherein the effective third voltage is one half the potential between the first voltage and the second voltage.

12. The pump control method of claim 10 wherein the cycle of periodic off times is about 15 milliseconds.

13. The pump control method of claim 10 wherein the cycle of periodic on times is between about 15 and 185 milliseconds.

14. The pump control method of claim 13 wherein the cycle of periodic on times is between about 15 and 185 milliseconds.

15. The pump control method of claim 10 wherein the periodic on time is between about 7.5% and 50% of the combination of the periodic off time and the periodic on time.

16. The pump control method of claim 15 wherein the periodic on time is between about 7.5% and 50% of the combination of the periodic off time and the periodic on time.

17. The pump control method of claim 12 wherein the periodic on time is between about 7.5% and 50% of the combination of the periodic off time and the periodic on time.

18. The pump control method of claim 10 wherein the voltage potential is between the first voltage and the second voltage is 28 VDC.

Assignees

• Deka Products Lp

Inventors

• Beavis Russell H
• Dattolo James J

Classifications

• F04B49/02

  Stopping, starting, unloading or idling control · CPC title

• F04B23/04 Primary

  Combinations of two or more pumps · CPC title

• B67D1/102

  for one liquid component only · CPC title

• B67D1/0037

  based on volumetric dosing · CPC title

• B67D2001/0097

  using a pump · CPC title