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| 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(guān)諧振電源轉(zhuǎn)換 |
| 文件頁數(shù)： | 8/28頁 |
| 文件大?。?/td> | 794K |
| 代理商： | SLUA159 |
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APPLICATION NOTE
ZVS Converter Limitations:
In a ZVS converter operating under ideal
conditions, the on-time of the switch
approaches zero, and the converter will operate
at maximum frequency and deliver zero output
voltage. In a practical design , however, the
switch on-time cannot go to zero for several
reasons.
First of all, the resonant tank components
are selected based on the maximum input
voltage
and minimum output current
I
for the circuit to remain resonant over all
operating conditions of line and load. If the
circuit is to remain zero voltage switched, then
the resonant tank current cannot be allowed to
go to zero. It can, however, reach
There is a finite switch on-time associated
with the inductor charging interval where the
resonant inductor current linearly increases
from
to +
As the on-time in the power
transfer interval approaches zero, so will the
converter output voltage. Therefore, the mini-
mum on-time and the maximum conversion
frequency can be calculated based upon the
limitation of
and zero output voltage.
The limits of the four zero voltage switched
time intervals will be analyzed when
minimum. Each solution will be retained in
terms of the resonant tank frequency
generalization.
U-138
goes
to
for
Both the minimum on-time and maximum
off-time have been described in terms of the
resonant tank frequency ,
step further will result in the maximum conver-
sion frequency
the resonant tank frequency.
Taking this one
also as a function of
Maximum Off-Time:
The maximum conversion frequency corre-
sponds to the minimum conversion period,
, which is the sum of the minimum on-
time and maximum off-time:
The maximum conversion frequency,
=
, equals
The ratio of the maximum conversion fre-
quency to that of the resonant tank frequency
can be expressed as a topology coefficient,
For this zero voltage switched Buck regulator
and its derivatives,
equals:
3-336
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