Digitally calibrated sawtooth generator for PWM based buck converters
US12323150B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 2, 2021 |
| Grant date | Jun 3, 2025 |
| Priority date | — |
| Expiry date | Sep 13, 2043 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K3/017
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Embodiments herein relate to a circuit which generates a sawtooth waveform based on an adaptive feedback loop that self-corrects the ramp up rate to account for variations in a device. The sawtooth waveform is obtained by repeatedly charging and discharging a capacitor according to a clock signal. The sawtooth waveform can be sampled once per clock period at a comparator which provides a corresponding binary output to a state machine. If the binary output indicates the amplitude of the sawtooth waveform is below a desired maximum voltage, the state machine outputs a code word to a digitally-controlled variable current source to increase the output current. The sawtooth waveform can be used to provide a pulse-width modulated (PWM) waveform such as for a DC-DC converter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.