Switch mode power supply (SMPS)
Switch mode power supplies are the modern solution to the problems of size
and weight. However, early examples of SMPS used in power amplification
were not ground breaking and literally adopted the type of supply found in
many computers today. The MARTIN AUDIO SMPS is different in that it is
regulated.
Whilst the SMPS may sound complex it is actually very straightforward with
high reliability. The net result is good bass and fast response. Because the
supply is regulated, the power amplifier will produce the same power output
even if the AC line voltage falls by more than 20%!
Figure 13. Current-voltage characteristic of different power supply topologies.
1) Conventional power supply shows voltage drop due to internal resistance.
2) Regulated power supply used by MARTIN AUDIO.
3) Unregulated switch mode power supply with current limiting.
Traditional PSU's can behave erratically at low frequencies, particularly
under clip conditions with the rise in their output impedance producing
uncontrollable speaker cone movement. MARTIN AUDIO SMPS produces
its rated power output at all frequencies regardless of speaker demands
and AC line conditions.
Martin Audio – MA1.3 Power Amplifier
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