High-speed charge-mode controller for a multi-phase switched-mode power converter
US6462521B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 17, 2001 |
| Grant date | Oct 8, 2002 |
| Priority date | — |
| Expiry date | Jul 17, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/1584
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A multiphase controller for a PWM power converter employs a single current sense device to measure input current, I, and an integrator at each phase to accurately measure power delivered during a pulse. The integrator monitors current delivered through a circuit which delivers a current signal scaled to I/N where N is the number of active phases. Thus where there are three overlapping phases, one-third of I is delivered to the integrator for each phase that is on or active. The integrator provides a Charge Ramp signal to an input of a Pulse Width Modulation (PWM) comparator associated with each phase. The other input of the PWM comparator is tied to an error control signal common to all of the phases. When the Charge Ramp signal and the error control signal match, the corresponding phase is turned off for the duration of the cycle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.