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參數資料
| 型號： | SLUA159 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Zero Voltage Switching Resonant Power Conversion |
| 中文描述： | 零電壓開關諧振電源轉換 |
| 文件頁數： | 5/28頁 |
| 文件大?。?/td> | 794K |
| 代理商： | SLUA159 |
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APPLICATION NOTE
tude is insufficient to accommodate typical
input and output variations, The exact time is
obtained by solving the resonant capacitor
voltage equations for the condition when zero
voltage is attained.
The equation can be further simplified by
extracting the half cycle (180 degrees) of con-
duction which is a constant for a given resonant
frequency, and equal to
The resonant component current
is a cosine function between time and
described as:
The absolute maximum duration for this
interval occurs when 270 degrees
resonant operation is required to intersect the
zero voltage axis. This corresponds to the limit
of resonance as minimum load and maximum
line voltage are approached.
Contributions of line and load influences on
the resonant time interval can be analyzed
individually as shown in Figs. 7 and 8.
Prior to time the catch diode
conducting.
Its voltage,
creasing from
at time to zero at while
input source
was supplying full output
current,
At time however, this situation
changes as the resonant capacitor initiates
resonance, diverting the resonant inductor
current away from the output filter section.
Instantly, the output diode voltage,
es polarity as it begins to conduct, supplement-
ing the decreasing resonant inductor current
with diode current
I’,
extracted from stored
energy in output inductor
rent waveshape follows a cosine function during
this interval, equalling minus
Also occurring at time the output filter
inductor releases the stored energy required
of
was not
was linearly de-
chang-
The diode cur-
U-138
LINE
CHANGES
Fig. 7 -- Resonant Capacitor Voltage vs. Line
Fig. 8 -- Resonant
Capacitor
Voltage vs. Load
to maintain a constant output current
reverse voltage is clamped to the output voltage
minus the diode voltage drop
convention followed by Figure 4.
Table III - RESONANT INTERVAL:
Its
by the
3-333
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