Transcript Details of end-life protection

NEW DESIGN FOR SELF-OSCILLATING
H.F. BALLAST VOLTAGE FED
By:
Rosario Scollo & Santina Leo
R. Scollo & S. Leo
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SCHEMATIC BLOCK
Fluorescent
Pre-heating signal
TUBE
Feed-back block
Output PFC
Main input
FILTER
~
BALLAST
AND
BRIDGE
PFC SELF-OSCILLATING
Self-oscillating driving
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1x40W Ballast Design ,Vmain = 120V, P.F. = 0.98
BUL3P5
STX724
BUL704
BUL3N7
1N5818/N
PFC section
Self oscillating ballast
BUL3N7
Feed-Back block
BUL704
X0203NA
+C
End-Life protection
1N5818
X0203NA
STX724
BUL3P5
R. Scollo & S. Leo
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Electrical schematic of PFC & performance
L1
D1
Vin(V)
Input
Power
(W)
T.H.D
(%)
Power
Factor
110
34.80
8.3
0.99
120
37.7
10.1
0.984
130
39
7.2
0.985
140
41.5
9.2
0.981
D2
Dz4
R1
R4
C4
Dz3
C1
C1
R2
C2
Q1
Ds
R3
D3
D4
R5
T
Q2
Dz2 C3
R. Scollo & S. Leo
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T.H.D. CORRECTION EFFECT
Imain
Vce
Ic
PFC on ballast 1x40W @ 120V
R. Scollo & S. Leo
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T.H.D. CORRECTION MODULATION
Ib
Modulation effect
Vce
T1
Ic
T2
PFC on ballast 1x40W @ 120V with correction
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MODULATION DETAILS
Ib
Ib
Vce
Vce
Ic
Ic
Detail @ low Ic value during steady-state
Detail @ high Ic value during steady-state
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Details on turn-off in steady-state
Ib
Vce
Ic
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PFC protection during start-up
Vce
Ic
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Self oscillating ballast
R5
L2
R4
C6
PTC C13
Q3
T
C5
D9
End-life protection
R6
C11
C12
T
400V
C4
D11
R12
SCR
Q4
D10
C8
R10
DZ2
R8
D12
C14
R7
C7
R9
C9
C10
R. Scollo & S. Leo
R11
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ST Concept description
+Vbb
A
R
V(t)
B
-Vbb
tA: storage time
tB: time to charge or discharge snubber capacitor
IbOFFpnp
tC: safety time margin
IbONnpn
IbOFFnpn
IbONpnp
IbONpnp =
IbONnpn =
V(t) – (-Vbb - Vbe)
R
V(t) – (Vbb + Vbe)
R
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Steady-state working
Ib
Ib
Vce
Vce
Ic
BUL3P5 @ steady-state with 120V Main voltage
Ic
BUL3N7@ steady-state with 120V Main voltage
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Details on turn-off and turn-on in steady-state
Ib
Ib
Ic
Ic
Vce
BUL3P5 @ turn-off with 120V Main voltage
Vce
BUL3N7 @ turn-off with 120V Main voltage
R. Scollo & S. Leo
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Details on turn-off and turn-on in steady-state
Ib
Ib
Vce
Vce
Ib
Ic
BUL3P5 @ turn-on with 120V Main voltage
BUL3N7 @ turn-on with 120V Main voltage
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Lamp preheating and start-up
Vlamp
Ilamp
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End-life protection circuit
Tube
NPN Base
T
A
D11
R12
R10
Dz2
D12
B
SCR
R8
C10
R9
R11
C9
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Details of end-life protection
Vce
Vlamp
Ic
Ilamp
Waveform on the lamp during end-life protection working
Waveform on the BUL704 during end-life protection working
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Details of end-life protection
Ic(PNP)
Ic(PFC)
Preheating detail during end-life protection working
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Demoboard Electrical Schematic
L1
D1
D2
D7
R5
L2
R13
L
R4
C6
D5
R14
C5
T
C15
Q1
C11
R6
C4
C1
L3
D3
D4
C12
R12
C2
R10
D8
R1
C13
PTC
D9
T
D16
R2
Q3
D6
D11
R3
C3 T
Q2
Q4
Dz1
D10 C8
SCR
R8
Dz2 D13
R7
C7
C10
R11
R9 C9
D1…D5 =
1N4007
D6(Schottky) =
(1N5818/N)
D7, D9…D11, D14=
BA159
D8, D13 =
1N4148
Dz2 = 47 V
Dz1 = 7.5 V
L1 = 1.5mH
L2 = 120μH
C1 = 680nF/250V
C2 = 680nF/100V(no
electrolytic)
C3 = 1
μF/63V
C4 = 22 μF
/400V
C5 = 56nF/100V
C6, C7 = 220
nF/100V
C8 = 2.2
nF/630V
C9 = 1 nF/16V
C10 = 10 μF/35V
C11 = 47
nF/400V
C12 = 6,8
nF/1000V
C13, C14 =
100nF/400V
R1 = 22 Ω
R2 = 6.8 Ω
R3 = 100 Ω
R4 = 8,2 Ω
R5 = 330 kΩ
R6 = 220 Ω
R7 = 330 kΩ
R8 = 1 kΩ
R9 = 22 kΩ
R10 = 680 kΩ
R11 = 56 kΩ
Q1 = BUL704
Q2 = STX724
Q3 = BUL3N7
Q4 = BUL3P5
Lp = 2.1 mH
Ns = 3 (PFC)
Ns = 2
SCR =
X0203NA
L3 = 1mH
C15 = 220nF/250V
R12 = 39 Ω
R13 = 220kΩ
R14 = 68kΩ
D16 = 130V
D15 = 180V
L=1mH
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220V version of Demoboard Electrical Schematic
L1
D1
D2
D7
L2
D5
R13
Rfuse
C15
Q1
Ds
D3
D4
C5
C11
R6
C12
C4
R12
C2
R10
D11
D8
R3
R1
C13
PTC
D9
T
Dz3
R2
L3
Q3
R14
T
C1
R4
R5
C6
T
Q4
Q2
C7
Dz1 C3
D10 C8
R7
SCR
Dz2 D12
R8
C14
C10
R11
R9 C9
D1…D5 =
1N4007
Ds(Schottky) =
(1N5818/N)
D7, D9…D11 = BA159
D8, D12 =
1N4148
Dz2 = 47 V
Dz1 = 5,6V
L1 = 1.8mH
L2 = 100μH
C1 = 220nF/400V
C2 = 470nF/100V
C3 = 1 μF/63V
C4 = 10 μF /450V
C5 = 47nF/63V
C6, C7 = 220 nF/50V
C8 = 1,5
nF/630V
C9 = 1 nF/16V
C10 = 10 μF/35V
C11 = 47
nF/400V
C12 = 6,8
nF/1000V
C13, C14 =
100nF/400V
R1 = 120 Ω
R2 = 4.7 Ω
R3 = 220 Ω
R4 = 8,2 Ω
R5 = 330 kΩ
R6 = 220 Ω
R7 = 330 kΩ
R8 = 1 kΩ
R9 = 22 kΩ
R10 = 680 kΩ
R11 = 56 kΩ
R12 = 39 Ω
R13 = 270 kΩ
R14 = 680KΩ
Q4 = BUL3P5
Q1 =BUL804
Q2 = STX724
Q3 = BUL3N7
Lp = 2.3 mH
Ns = 2 (PFC)
Ns = 2
SCR = X0203NA
L3 = 1mH
C15 = 100nF/400V
Dz3 = 200V
R. Scollo & S. Leo
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R. Scollo & S. Leo
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