Voltage regulation employing a composite feedback signal
US6465993B1 · kind B1 · utility
Inventors
Key dates
| Filing date | Nov 1, 1999 |
| Grant date | Oct 15, 2002 |
| Priority date | — |
| Expiry date | Nov 1, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/0025
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A switching power supply produces a regulated output voltage. An output inductor is connected at one end to a power switch circuit having a duty cycle. The other end of the output inductor has a regulated output voltage. A voltage feedback circuit produces a voltage feedback signal representative of the regulated output voltage. A current feedback circuit produces a composite signal representative of inductor current, the composite signal having an ac component and a dc component. An error amplifier produces an error signal representative of the difference between a reference voltage and the voltage feedback signal. A pulse width modulator comparator compares the error signal to a composite signal representing a summing of the voltage feedback signal with a current sensing signal representative of output inductor current, the composite signal having an ac component and a dc component. The comparator output results in a gate drive signal that controls the duty cycle of the power switch circuit to maintain the regulated output voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.