Switching regulator soft start circuit
US5248904A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 19, 1992 |
| Grant date | Sep 28, 1993 |
| Priority date | — |
| Expiry date | Oct 19, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10N30/802
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A switching regulator soft start circuit and technique which eliminates variations in frequency and is capable of more appropriately preselecting a suitable operating frequency by using a timer which responds to a start signal by generating an initial condition release signal after a predetermined interval, a frequency divider for obtaining a desired oscillation frequency from the output of a switching regulator, and a first gate element connected to receive the output of the frequency divider and the initial condition release signal, and to provide as an output a gate control signal that varies in frequency corresponding to the frequency divider output whenever the initial condition release signal is off but provides a gate control that delivers undivided switching regulator signals when the initial condition release signal is on; and a gate circuit connected to receive oscillation frequency signals and the gate control signal to control the delivery of output signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.