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參數(shù)資料
| 型號： | AN-995A |
| 英文描述： | Electronic Ballasts Using the Cost-Saving IR215X Drivers(153.99 k) |
| 中文描述： | 使用電子鎮(zhèn)流器的成本節(jié)約IR215X驅(qū)動(dòng)器（153.99十一） |
| 文件頁數(shù)： | 6/10頁 |
| 文件大?。?/td> | 153K |
| 代理商： | AN-995A |
Application
Notes
C-64
C
ONTROL
I
NTEGRATED
C
IRCUIT
D
ESIGNERS’
M
ANUAL
120 VAC
91K, 1/2W
L
4
L
1
10KF6
10KF6
0.01
μ
F
600V
40
W
1
μ
F
400V
PTC
0.01
μ
F
600V
22
IRF820
10KF6
8
7
6
01
μ
F
100
μ
F
200V
+
+
47
μ
F
20V
1
2
3
IRF830
0.22
μ
F
250 VAC
0.22
μ
F
250 VAC
4 x
1N4007
0.01
μ
F
600V
PTC
+
10
L
3
40
W
L
2
0.001
μ
F
15K
22
4
5
V
CC
R
T
C
T
V
B
HO
V
S
LO
COM
IR2151
The LM311 comparator produces a positive output
whenever the instantaneous voltage on C
T
exceeds a
fraction of the DC bus voltage. This output is ‘OR’ed
with the 50% LO waveform and impedance matched to
drive the boost MOSFET by a 2N2222A emitter fol-
lower. The DC bus regulation resulting from this tech-
nique is 210-225 VDC with an input AC range of 90
VAC to 130 VAC and dimming from 50% to 100% (225
VDC maximum with bulb removed). Dimming is per-
formed by raising the operating frequency to approxi-
mately double for a 50% reduction in power output.
Reliable striking of the lamp is always assured at any
dimming setting because the circuit is synchronized to
the natural resonance of the lamp circuit. Note the back-
to-back diodes which form a zero current crossing detec-
tor for the lamp current and the connection of C
T
to this
synchronizing voltage (see also figure 2.)
After the lamp strikes, the synchronization circuit is no
longer able to control the frequency which then reverts
to whatever is selected by C
T
and the variable R
T
.
In addition to the popular fluorescent ballast applica-
tions, there is a growing interest in High Intensity Dis-
charge (HID) ballasts for outdoor lighting. These too can
be simply designed using the International Rectifier
IR2151. A 70 watt high-pressure sodium (HPS) ballast is
illustrated in Figure 10.
Figure 6.
‘Double 40’ IR2151 ballast with active power factor correction
HPS ballasts have some unique requirements not
found in fluorescent ballasts. They must:
not be damaged when operating into open cir-
cuit
supply sufficient energy at 3 - 4 kV to start the
lamp
accomodate large variations in lamp voltage
not cause arc instability in the lamp
be matched to lamp characteristics to maximize
lamp life
The circuit shown in figure 10 provides an input power
factor >0.9 and has DC bus control limiting the voltage
to 225 VDC whether or not the lamp is energized. L3
performs two functions:
1) current limiting for the negative resistance
characteristics of the lamp
2) a pulse voltage step-up function to strike the
HPS lamp.
The 3 kV pulse voltage is derived from a 135V SIDAC
which discharges a 1 μF capacitor into the 2 turn wind-
ing of L3. The 30:1 step-up ratio of L3 supplies the
starting pulse to the lamp. After the lamp strikes, there is
insufficient charge voltage on the 1 μF capacitor in the 2
turn winding circuit to avalanche the SIDAC and no fur-
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