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參數(shù)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(zhuǎn)換 |
| 文件頁數(shù)： | 6/28頁 |
| 文件大?。?/td> | 794K |
| 代理商： | SLUA159 |
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APPLICATION NOTE
Inductor Charging State:
To facilitate zero voltage switching, switch
is activated once the voltage
and resonant capacitor
occurring at time
During this inductor
charging interval
resonant inductor current
is linearly returned from its negative peak
of minus to its positive level of plus
The output catch diode
the interval. It continues to freewheel the
full output current
clamping one end of the
resonant inductor to ground through
is a constant voltage,
resonant inductor. As a result,
decreases linearly. Energy stored in output
inductor
continues to be delivered to the
load during this time period.
A noteworthy peculiarity during this
span can be seen in the switch dram current
waveform. At time when the switch is turned
on, current is actually returning from the
resonant tank to the input source,
indicates the requirement for a reverse polarity
diode across the switch to accommodate the bi-
directional current. An interesting result is that
the switch can be turned on at any time during
the first half of the interval without affecting
normal operation. A separate time interval
could be used to identify this region if desired.
Table IV - INDUCTOR CHARGING:
across
has reached zero,
COMP. STATUS
CIRCUIT VALUES
conducts during
There
across the
rises linearly,
the conversion period, most of the pertinent
waveforms approach DC conditions.
Assuming ideal components, with
the input source supplies output current and
the output filter inductor voltage
The switch current and resonant inductor
current are both equal to
tive voltage drops are zero
Catch diode voltage
In closed loop operation where the output
voltage is in regulation, the control circuit
essentially varies the on-time of the switch
during the
interval. Variable frequency
operation is actually the result of modulating
the on-time as dictated by line and load condi-
tions. Increasing the time duration, or lowering
the conversion frequency has the same effect as
widening the duty cycle in a traditional square
wave converter. For example, if the output
voltage were to drop in response to an
increased load, the conversion frequency would
decrease in order to raise the effective ON
period. Conversely, at light loads where little
energy is drawn from the output capacitor, the
control circuit would adjust to minimize the
duration by increasing the conversion frequen-
cy. In summary, the conversion frequency is
inversely proportional to the power delivered to
the load.
This
closed,
equals
and their respec-
equals
and
= 0.
Power Transfer State:
Once the resonant inductor current
reached at time the zero voltage switched
converter resembles a conventional square
wave power processor. During the remainder of
has
3-334
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