Constant on-time controller and buck regulator device using the same
US11095221B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 16, 2020 |
| Grant date | Aug 17, 2021 |
| Priority date | — |
| Expiry date | Apr 16, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/1582
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A constant on-time controller (COT) includes: a voltage dividing circuit to generate a feedback voltage according to an output voltage of a buck regulator; a current ripple extracting circuit to sense a current from an inductor of a buck regulator, and generate an extracted ripple current having no DC component according to a sensed current; a one-shot on-timer to output a constant-on time control signal according to a regulator input voltage of the buck regulator and the output voltage; a comparing circuit to output a comparison result according to a reference voltage signal, the feedback voltage and the extracted ripple current; and a logic circuit to generate a control signal to the buck regulator according to the comparison result and the constant-on time control signal. The current ripple extracting circuit detects the DC component in the present cycle, and compares the detected DC component with the next cycle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.