MC33368
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13
Figure 18. Power Factor Test Setup
1 0
AC Power
Analyzer
PM 1000
A
V
Voltech
EMI Filter
T
2X Step-up
Isolation
Transformer
Autoformer
115 Vrms
Input
Line
Neutral
0 to 270 Vac
Output to
Power Factor
Correction
Circuit
HI
HI
L.O.
L.O.
0.1
1.0
W VA PF V
rms
A
rms
V
D
Acf Ainst Freq HARM
An RFI filter is required for best performance when connecting the preconverter directly to the ac line. The filter attenuates the level of high
frequency switching that appears on the ac line current waveform. Figures 16 and 17 work well with commercially available two stage filters
such as the Delta Electronics 03DPCG6. Shown above is a single stage test filter that can easily be constructed with four ac line rated
capacitors and a commonmode transformer. Coilcraft CMT3282 was used to test Figures 16 and 17. It has a minimum inductance of 28 mH
and a maximum current rating of 2.0 A. Coilcraft CMT4179 was used to test Figure 20. It has a minimum inductance of 17 mH and a
maximum current rating of 9.0 A. Circuit conversion efficiency ?(%) was calculated without the power loss of the RFI filter.
Figure 19. On/Off Control
Multiplier
8
C1
22
Frequency
Clamp
R
S
Q
R
S
S
Timer R
V
ref
Leading Edge
Blanking
Low
Load Detect
Comp
FB
6
LEB
13
PGND
Gate
ZCD
V
CC
Line
RD
AGND
MC33368
16
12
7
11
10
FC
9
3
1
4
Quickstart
Overvoltage
Comparator
Set Dominant
1.5 V
15 V
Q
5.0 V
Reference
DC
Out
D5
C3
330
MTW14N50E
Q1
D6
C4
100
T
R4
22 k
EMI
Filter
92 to
270 Vrms
R7
0.1
C5
1.0
R5
1.3 M
R3
10 k
C2
0.01
R1
10 k
R2
820 k
R8
10 k
C9
330 mF
D1
D3
D2
D4
R11
10
15 V
C6
0.1
13/8.0
UVLO
1.2/1.0
R13
51
D8
R
S
Latch
V
ref
V
ref
V
ref
CS
2
5
Mult
V
CC
6.9 V
1.0 k
10 k
1.0 k
2N3904
1N4148
On/Off
Input
Zero
Current
Detect
1.08 x V
ref
5.0 V Off
0 V On
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