Three-pin buck converter and four-pin power amplifier having closed loop output voltage control
US5818207A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 11, 1996 |
| Grant date | Oct 6, 1998 |
| Priority date | — |
| Expiry date | Dec 11, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B70/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A circuit for providing a regulated output voltage from a buck converter without directly monitoring the output voltage. The buck converter includes a switch having a first terminal coupled to a supply voltage and a second terminal coupled to a first terminal of an inductor and to a first terminal of a resistive divider. A second terminal of the inductor is coupled to a first capacitor for forming the output voltage across the first capacitor. A voltage formed by the resistive divider is applied to an inverting input of a transconductance amplifier, while a reference voltage is applied to a non-inverting input of the transconductance amplifier. An output of the transconductance amplifier is coupled to a second capacitor for forming an error signal across the second capacitor. The error signal is representative of a difference between the output voltage and a desired output voltage because an average of the voltage formed by the resistive divider is representative of the output voltage. The error signal is compared to a periodic ramp signal by a comparator for forming a switch control signal. Therefore, circuit regulates the output voltage in a feedback loop by monitoring a voltage …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.