Switching regulator cycle-by-cycle current estimation
US9285399B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 29, 2012 |
| Grant date | Mar 15, 2016 |
| Priority date | — |
| Expiry date | Jan 28, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/1584
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A switching regulator includes an output phase having a high-side transistor and a low-side transistor operable to switch on and off at different periods responsive to a pulse width modulation (PWM) signal applied to the output phase, each cycle of the PWM signal having an on-portion and an off-portion. The switching regulator further includes a current sense circuit operable to sense the current of the low-side transistor, an analog-to-digital converter operable to sample the sensed low-side transistor current during the off-portion for each PWM cycle and a current estimator operable to estimate a cycle average current for the present PWM cycle based on the low-side transistor current sampled during the off-portion for the immediately preceding PWM cycle and a pulse width estimate for the on-portion for the present PWM cycle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.