Circuit and method for maximum duty cycle limitation in step up converters
US9698681B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 2015 |
| Grant date | Jul 4, 2017 |
| Priority date | — |
| Expiry date | Nov 24, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/1582
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An adaptive duty cycle limiting circuit is used with a switching DC-to-DC converter for preventing the duty cycle entering a region of operation having negative gain. The adaptive duty cycle limiting circuit includes a duty cycle ramp signal generator, a voltage source for providing a voltage having a fractional value of an input voltage source, and a comparator that compares the duty cycle ramp signal with the fractional value of the input voltage source. When the voltage level of the duty cycle ramp signal is less than the fractional value of the voltage source, a cycle limit signal is activated and communicated to a switching control circuit to adjust the duty cycle of the switching DC-to-DC converter to prevent the duty cycle entering the region of operation where the gain of the switching DC-to-DC converter becomes negative.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.