Method to improve the peak-current limit in a slope-compensated, current-mode DC/DC converter, and circuit therefor
US5717322A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 16, 1996 |
| Grant date | Feb 10, 1998 |
| Priority date | — |
| Expiry date | Feb 16, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/156
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method and circuit for modifying the clamping level (VCLAMP) of the error signal voltage (VERROR), which clamp in turn limits the peak current in the inductor of a slope-compensated, current mode DC/DC converter. VCLAMP may be modified and/or variable such that it is a function of average current in the inductor, peak current in the inductor, the converter duty cycle and/or the level of slope compensation used in the converter. The modification of VCLAMP may result in the peak current limit being independent of the converter duty cycle and/or the level of slope compensation used in the converter. Further, the modification of VCLAMP does not compromise the operational stability of the converter which is achieved by the use of a slope compensation. In addition, the clamping of the error signal before slope compensation rather than after slope compensation avoids instability at high duty cycles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.