Control for regulator fast transient response and low EMI noise
US8314598B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 16, 2012 |
| Grant date | Nov 20, 2012 |
| Priority date | — |
| Expiry date | Feb 16, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/0025
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Methods and circuits for power supply arrangement and control are disclosed herein. In one embodiment, a switching regulator can include: (i) a filter network coupled to an output terminal, where an output voltage is generated at the output terminal from an input source; (ii) an active switch to connect the input source to the filter network by periodically operating between on and off states over a switching period, where a duty cycle of the on state relative to the switching period is modulated based on a PWM control signal; (iii) a comparator receiving an output feedback signal, a hysteresis signal, and a reference level, and providing the PWM control signal therefrom; and (iv) a hysteresis programming circuit generating the hysteresis signal, and a ramp control signal, where the hysteresis signal is programmed based on conditions at the input source and the output voltage to achieve a pseudo constant frequency operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.