RCC power supply with remote disabling of oscillation frequency control
US6285566A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 21, 1999 |
| Grant date | Sep 4, 2001 |
| Priority date | — |
| Expiry date | Jan 21, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/3385
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A self-oscillation switching power supply apparatus of the ringing choke converter type comprises a transformer T including a primary winding N1, a secondary winding N2, and a feedback winding N.sub.B ; a switching transistor Q1 which oscillates in a self-oscillating fashion in response to a feedback signal from the feedback winding N.sub.B thereby turning on and off the current flowing through the primary winding; a rectifying and smoothing circuit connected to the secondary winding; an oscillation frequency control circuit including a control transistor Q3 for controlling a control signal input to the switching transistor Q1 thereby controlling the control transistor Q3 so as to extend the off-time in the self-oscillation period of the switching transistor Q1; and an oscillation frequency control disabling circuit for disabling the control of the control transistor Q3 in accordance with a remote signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.