Current control circuit
US4242714A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 21, 1979 |
| Grant date | Dec 30, 1980 |
| Priority date | — |
| Expiry date | Mar 21, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K4/62
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a circuit for controlling the current flow through a coil, such as the horizontal deflection coil of a television receiver, a first switching device including, for example, a first switching transistor and a first damper diode is connected in parallel with a first resonant circuit including a first capacitor and a first coil, which is the coil through which the current flow is to be controlled. A second switching device including for example, a second switching transistor and a second damper diode is connected in parallel with a second resonant circuit including a second capacitor and a second coil. First and second charging capacitors are connected in series with the first and second coils, respectively, and the power is supplied to the first and second resonant circuits for example through a third coil. Switching signals of the same frequency, for example, the horizontal frequency of a video signal, are applied to the first and second switching transistors with the phase difference between such signals being controlled to vary the relative voltages across the first and second charging capacitors and hence "to control" the current flowing through the first coil. The phase diffe…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.