Granted Patent B2

US 9,209,689 · App. 14/083,784 · Granted Dec 8, 2015

Abstract

Claims (27)

1. A system for regulating an output voltage or current given an input voltage, the system comprising:

a first analog-to-digital converter for sampling a signal representing a load current or voltage;

a second analog-to-digital converter for sampling a signal representing an input voltage;

a digital controller for:

i. generating a signal representing an inverted version of the sampled signal representing the input voltage;

ii. multiplying the signal representing the inverted version of the input voltage with the sampled signal representing the load current or voltage to thereby remove a dependency of the load current or voltage on the input voltage; and

iii. generating a feedback signal based at least in part on the multiplication, the feedback signal being independent to changes in the input voltage; and

a pulse-width modulator for varying the load current or voltage based on the feedback signal.

2. The system of claim 1 , further comprising a resistor divider for generating the signal representing an input voltage.

3. The system of claim 1 , wherein the first and second analog-to-digital converters are time-multiplexed portions of one analog-to-digital converter.

4. The system of claim 1 , wherein the digital controller comprises at least one of a repetitive controller, an iterative-learning controller, or run-to-run controller.

5. The system of claim 1 , wherein the digital controller implements a transfer function for generating the output signal.

6. The system of claim 1 , further comprising a current-sense resistor for translating the output current to a voltage.

7. The system of claim 1 , further comprising a filter for removing high-frequency components of the signal representing the load current or voltage.

8. The system of claim 1 , wherein the digital controller further detects when the input voltage is zero and prevents a division-by-zero error.

9. A method for regulating an output voltage or current given an input voltage, the method comprising:

sampling a signal representing a load current or voltage;

sampling a signal representing an input voltage;

generating a signal representing an inverted version of the sampled signal representing the input voltage;

multiplying the signal representing the inverted version of the input voltage with the sampled signal representing the load current or voltage to thereby remove a dependency of the load current or voltage on the input voltage;

generating a feedback signal based at least in part on a result of the multiplication, wherein the feedback signal is independent to changes in the input voltage; and

varying the load current or voltage based on the feedback signal.

10. The method of claim 9 , wherein a source of the time-varying disturbance comprises a power transformer or a rectifier.

11. The method of claim 9 , wherein the time-varying disturbance repeats periodically.

12. The method of claim 9 , further comprising generating the signal representing the input voltage by scaling the input voltage.

13. The method of claim 9 , wherein generating the feedback signal comprises synthesizing an actuation sequence in a current repetition based on a tracking error detected in a prior repetition.

14. The method of claim 9 , wherein generating the feedback signal comprises generating a model of the time-varying disturbance.

Assignments (10)