H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/105
H04N 3/16 (2006.01) H02M 3/156 (2006.01) H03K 4/62 (2006.01) H04N 3/18 (2006.01)
Patent
CA 1043904
ABSTRACT A circuit arrangement for television display apparatus including a switched mode power supply circuit and a line de- flection circuit. The switched mode power supply circuit, which is connectable to a direct voltage source, comprises a series arrangement of a first switch, a first inductor and a supply capacitor. The line deflection circuit comprises a series ar- rangement of a second switch and a second inductor and a line deflection coil. The first switch is adapted to be switched under the control of a first control signal at a frequency which is in integral harmonic relation to the line frequency to pro- duce a charge on the supply capacitor which when charged acts as a second direct voltage supply source for the line deflection circuit. The second switch is adapted to be switched under the control of a second control signal at a line frequency to pro- vide a deflection current to the line deflection coil during scan periods and to be non-conducting during flyback periods and the second inductor is tuned to a first frequency such that the period is substantially equal to twice the flyback period. The circuit arrangement is characterized in that the first inductor is tuned to a predetermined second frequency such that the period is substantially equal to twice the non- conducting time of the first switch, whilst the first and second inductors are inductively loosely coupled. The first switch and the second switch a asynchronously switchable.
223416
Gent Derek J.
Skelton Dennis C.f.
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