Discontinuous conduction mode (DCM) using sensed current for a switch-mode converter
US7719248B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 28, 2008 |
| Grant date | May 18, 2010 |
| Priority date | — |
| Expiry date | Nov 12, 2028 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P80/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A switch-mode converter controller and method utilizes a comparator for receiving and comparing a sensed current and a peak current that is determined by a product of a multiplying factor, that is greater than or equal to two, and a target current. A finite state machine (FSM) is configured to operate the switch-mode converter in a discontinuous conduction mode (DCM). Responsive to the comparator, the FSM turns on the switch and observes an on-time duration of the switch until the sensed current reaches the peak current; calculates a switching period responsive to the peak current and the observed on-time duration; and varies the switching period responsive to the on-time duration and the multiplying factor such that an average of the sensed current equals the target current. The FSM can also be configured to alternatively operate the switch-mode converter in a continuous conduction mode (CCM).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.