Switching power source with inrush current limiting circuit
US5032968A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 20, 1990 |
| Grant date | Jul 16, 1991 |
| Priority date | — |
| Expiry date | Mar 20, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/335
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A switching power source having a rectifier circuit and smoothing capacitor for obtaining a d.c. power from an a.c. input, an oscillator circuit constructed of a serial circuit of a primary winding of a power transformer and a switching element for intermittently turning on and off the d.c. power, the power transformer having another winding of the power transformer for detecting the oscillation state of the oscillator circuit, and a rush current preventing circuit constructed of a parallel circuit of a resistor and a thyristor for turning on the thyristor upon reception of a signal from another winding, the rush current preventing circuit being connected at the input side of the rectifier circuit or between the output side of the rectifier circuit and the smoothing capacitor, the switching power source comprising a detector circuit for generating a signal when the interception period of the a.c. input exceeds a first setting time; and an oscillation stopping circuit for stopping the operation of the oscillator circuit for a second setting time in response to the signal from the detector circuit, and when the a.c. input is supplied at the time other than while the operation of the …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.