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发表于 2008-10-6 15:19:06
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Snubber Circuits:Theory , Design and Application by Philip C. Todd
Introduction
Snubbers are an essential part of power electronics.
Snubbers are small networks of parts in the
power switching circuits whose function is to
control the effects of circuit reactances.
Snubbers enhance the performance of the switching
circuits and result in higher reliability, higher
efficiency, higher switching frequency, smaller size,
lower weight, and lower EMI. The basic intent of
a snubber is to absorb energy from the reactive
elements in the circuit. The benefits of this may
include circuit damping, controlling the rate of
change of voltage or current, or clamping voltage
overshoot. In performing these functions a snubber
limits the amount of stress which the switch must
endure and this increases the reliability of the
switch. When a snubber is properly designed and
implemented the switch will have lower average
power dissipation, much lower peak power dissipation,
lower peak operating voltage and lower peak
operating current. This article describes some of the
various types of snubbers, where they are used,
how they function, how they are designed and what
their limitations are.
Snubbers may be either passive or active networks.
This article is limited to the main types of passive
snubbers. Passive snubber network elements are
limited to resistors, capacitors, inductors and diodes.
Active snubbers include transistors or other active
switches, often entail a significant amount of extra
circuitry and introduce another level of parasitics
which must be dealt with (usually with a passive
snubber). However, active snubbers are appropriate
in some applications. A good example of an active
snub is what you would like to say to your boss
when he or she decides not to give you a raise. |
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发表于 2008-10-6 15:13:19
