Constant frequency duty cycle independent synthetic ripple regulator
US7145317B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 8, 2005 |
| Grant date | Dec 5, 2006 |
| Priority date | — |
| Expiry date | Nov 8, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/156
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A synthetic ripple generator that controls conversion of an input voltage to an output voltage while maintaining a relatively constant switching frequency including a ripple capacitor and resistor, a transconductance amplifier circuit, an output error circuit, a frequency control circuit and a hysteretic comparator. The ripple capacitor and resistor develop a ripple voltage. The transconductance amplifier circuit switches, based on a PWM signal, between charging the ripple capacitor based on the input voltage and discharging the ripple capacitor based on the output voltage. The output error circuit provides a compensation voltage indicative of an error of the output voltage. The frequency control circuit develops a ripple window voltage relative to the compensation voltage to adjust switching frequency. The hysteretic comparator has a first input receiving the ripple voltage, a second input receiving the compensation voltage, a third input receiving the ripple window voltage, and an output providing the PWM signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.