Arrangement for generating a sawtooth current
US4890043A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 2, 1988 |
| Grant date | Dec 26, 1989 |
| Priority date | — |
| Expiry date | Nov 2, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K4/62
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A line deflection stage includes a line oscillator (LO), a driver (DR) and a line output transistor (TR1) the collector of which is connected through the parallel arrangement of a switching transistor (TR2) and a diode (D3) to a line deflection coil (Ly) and a scan capacitor (C.sub.s). The deflection coil (Ly) and scan capacitor (C.sub.s) are shunted by a diode (D2) while a flyback capacitor (C.sub.f) is connected across the emitter-collector path of transistor (TR1). The line oscillator (LO) output is also applied to an input of a flyback time controller (TC) which produces a pulse output under the control of a control input (C). This pulse output is amplified by a further transistor (TR3) and an associated transformer (T) and applied to the base of transistor (TR2) to cut this transistor off for a controlled part of the flyback period to prevent the flyback capacitor from immediately discharging and hence extend the flyback period.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.