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| 型號： | AN-15 |
| 英文描述： | TOPSwitch Power Supply Design Techniques for EMI & Safety |
| 中文描述： | 的TOPSwitch電源電磁干擾設(shè)計技術(shù) |
| 文件頁數(shù)： | 18/36頁 |
| 文件大?。?/td> | 381K |
| 代理商： | AN-15 |
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AN-15
A
6/96
18
common mode emission currents as follows:
I
: Splits into earth ground component and secondary
component. Secondary current component returns to the
TOPSwitch
Drain through transformer capacitance. Earth
ground component returns up from ground into the neutral
wire (and is sensed by the LISN), AC couples into the Line
wire (and is sensed by the LISN), flows back through bridge
diodes (either superimposing on line frequency current
during bridge diode conduction or through effective bridge
diode capacitance when diodes are not conducting), to V+
and V- bus wires, and returns to the
TOPSwitch
Drain pin
through C
W5
and C
OSS
.
I
: Splits between C
returning to primary
,
C
to
earth ground, and C
. Splits again between C
and earth
ground. Earth ground components returns through neutral
and line wires (as explained above) and is sensed by the
LISN.
I
: Splits between C
and earth ground. Earth ground
component returns through neutral and line wires (as
explained above) and is sensed by the LISN.
I
: Splits between C
(note that C
Equivalent Series
Inductance or ESL will choke off high frequencies) andV-.
V- component flows out the bridge rectifier, down through
line and neutral wires (and is sensed by the LISN) to earth
CS1
CS2
CW6
CW2
CW5
COSS
CW3
CW4
ESL
ESR
VAC
VDIODE
VDRAIN
CAC
CBD4
CBD1
CBD3
CBD2
CIN
V+
V-
+
-
PI-1644-111695
CW1
Figure 33. Circuit Origin for Common Mode Emissions.
CW
: Winding capacitance from “noisy” or switching side
of the transformer primary to “quiet” side of the secondary.
CW
: Winding capacitance from “quiet” side of the
transformer primary to the “noisy” or switching side of the
secondary.
CW
: Winding capacitance from “quiet” side of the
transformer primary to the “quiet” side of the secondary.
(This is actually a “good” stray capacitance term which is
usually augmented with an additional, Y-capacitor to return
displacement currents back to the driving source).
CW
5
: Winding capacitance across the primary.
CW
6
: Winding capacitance across the secondary (CW
and
CW
combine to cause a transformer resonant frequency of
400 kHz to 2 MHz above which each winding impedance is
capacitive rather than inductive).
The
TOPSwitch
Drain node directly drives displacement current
into each of the following stray capacitance terms: C
S1
, C
W1
,
C
W2
, C
, and C
. Each displacement current (I
, I
, I
,
I
, and I
CW5
) must eventually return to the driving node
(
TOPSwitch
some fraction of each displacement current may flow through
the power supply AC input conductors and be measured as
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|---|---|
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| AN-19 | TOPSwitch Flyback Power Supply Efficiency |
| AN-20 | Transient Suppression Techniques for TOPSwitch Power Supplies |
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