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參數(shù)資料
| 型號(hào)： | 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)： | 4/28頁 |
| 文件大?。?/td> | 794K |
| 代理商： | SLUA159 |
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APPLICATION NOTE
Fig. 5 - Simplified Model
Fig. 6 - Resonant Capacitor Waveforms
it is off, the current is diverted around the
switch through the resonant capacitor
constant output current will linearly increase
the voltage across the resonant capacitor until
it reaches the input voltage
the current is not changing, neither is the
voltage across resonant inductor
At time the switch current “instantly”
drops from
to zero. Simultaneously, the
resonant capacitor current
to I,, while the resonant inductor current
and output inductor current
and also equal to during interval
across output inductor
diode
linearly decreases during this interval
due to the linearly increasing voltage across
resonant capacitor
At time ,
and
starts to conduct.
The
=
Since
snaps from zero
are constant
Voltage
and output catch
equals
U-138
Table II - CAPACITOR CHARGING:
Resonant State:
The resonant portion of the conversion cycle
begins at when the voltage across resonant
capacitor
equals the input voltage
the output catch diode begins conducting. At
, current through the resonant components
and
equals the output current
The stimulus for this series resonant L-C
circuit is output current flowing through the
resonant inductor prior to time The ensuing
resonant tank current follows a cosine function
beginning at time and ending at time At
the natural resonant frequency
L-C
tank components exhibit an impedance
equal to the tank impedance,
the peak voltage across
function of
and
.
The instantaneous voltage across
can be evaluated over the resonant time inter-
val using the following relationships:
and
each of the
Therefore,
and switch
are a
and
Of greater importance is the ability to solve
the equations for the precise off-time of the
switch. This off-time will vary with line and
load changes and the control circuit must
respond in order to facilitate true zero
voltage
switching. While some allowance does exist for
a fixed off time technique, the degree of lati-
3-332
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| SLUC-MINIB-BLK | 制造商:IXYS Corporation 功能描述:SOLAR USB CHARGER BLACK |
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