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NEW DESIGN FOR SELF-OSCILLATING H.F. BALLAST VOLTAGE FED

Power Transistor Application Lab & Market Development Group. NEW DESIGN FOR SELF-OSCILLATING H.F. BALLAST VOLTAGE FED. By: Rosario Scollo & Santina Leo. Fluorescent TUBE. Pre-heating signal. Feed-back block. Output PFC. Main input. FILTER AND BRIDGE. ~. BALLAST.

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NEW DESIGN FOR SELF-OSCILLATING H.F. BALLAST VOLTAGE FED

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  1. Power Transistor Application Lab & Market Development Group NEW DESIGN FOR SELF-OSCILLATING H.F. BALLAST VOLTAGE FED By: Rosario Scollo & Santina Leo R. Scollo & S. Leo

  2. Fluorescent TUBE Pre-heating signal Feed-back block Output PFC Main input FILTER AND BRIDGE ~ BALLAST PFC SELF-OSCILLATING Self-oscillating driving SCHEMATIC BLOCK R. Scollo & S. Leo

  3. BUL3P5 STX724 X0203NA X0203NA BUL704 BUL3N7 1N5818/N 1N5818/N PFC section Self oscillating ballast Feed-Back block +C BUL3N7 End-Life protection 1N5818 BUL704 X0203NA STX724 BUL3P5 1x40W Ballast Design ,Vmain = 120V, P.F. = 0.98 R. Scollo & S. Leo

  4. L1 D1 D2 Dz4 R1 R4 C4 Dz3 C1 C1 R2 C2 Q1 D4 Ds R3 R5 T Q2 D3 C3 Dz2 Electrical schematic of PFC & performance R. Scollo & S. Leo

  5. PFC on ballast 1x40W @ 120V T.H.D. CORRECTION EFFECT R. Scollo & S. Leo

  6. Modulation effect T1 T2 PFC on ballast 1x40W @ 120V with correction T.H.D. CORRECTION MODULATION R. Scollo & S. Leo

  7. Detail @ low Ic value during steady-state Detail @ high Ic value during steady-state MODULATION DETAILS R. Scollo & S. Leo

  8. Details on turn-off in steady-state R. Scollo & S. Leo

  9. PFC protection during start-up R. Scollo & S. Leo

  10. Self oscillating ballast End-life protection R. Scollo & S. Leo

  11. ST Concept description +Vbb A R V(t) B -Vbb IbOFFpnp IbONnpn V(t) – (-Vbb - Vbe) IbONpnp IbONpnp = IbOFFnpn R V(t) – (Vbb + Vbe) IbONnpn = R R. Scollo & S. Leo

  12. BUL3P5 @ steady-state with 120V Main voltage BUL3N7@ steady-state with 120V Main voltage Steady-state working R. Scollo & S. Leo

  13. BUL3P5 @ turn-off with 120V Main voltage BUL3N7 @ turn-off with 120V Main voltage Details on turn-off and turn-on in steady-state R. Scollo & S. Leo

  14. BUL3P5 @ turn-on with 120V Main voltage BUL3N7 @ turn-on with 120V Main voltage Details on turn-off and turn-on in steady-state R. Scollo & S. Leo

  15. Lamp preheating and start-up R. Scollo & S. Leo

  16. Tube NPN Base End-life protection circuit R. Scollo & S. Leo

  17. Waveform on the BUL704 during end-life protection working Waveform on the lamp during end-life protection working Details of end-life protection R. Scollo & S. Leo

  18. Preheating detail during end-life protection working Details of end-life protection R. Scollo & S. Leo

  19. Demoboard Electrical Schematic R. Scollo & S. Leo

  20. L1 D7 R5 L2 C6 R4 D1 D2 C13 D5 Q3 D9 PTC R13 R14 C11 C5 R6 T Rfuse C15 C12 T Dz3 C4 C1 R12 R2 C2 R10 L3 Q1 D11 D8 Ds Dz2 D12 R3 R8 D10 T SCR C8 D3 D4 C14 R1 Q4 Q2 R7 R11 C7 C3 C10 Dz1 C9 R9 220V version of Demoboard Electrical Schematic R. Scollo & S. Leo

  21. Thank you R. Scollo & S. Leo

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