Operating Principles - Whistler Group XP1200i Owner's Manual

OPERATING PRINCIPLES

Whistler inverters work in two stages. During the first stage,
the DC to DC converter increases the DC input voltage from
the power source (e.g. a 12 volt battery) to 145 volts DC. In the
second stage, the high voltage DC is converted to 115 volts
(60 Hz AC) using advanced power MOSFET transistors in a full
bridge configuration. The result is excellent overload capability
and the capacity to operate difficult reactive loads. The output
waveform resulting from these conversions is a "quasi-sine
wave" or a "modified sine wave" as shown on below.
This stepped waveform is similar to the power generated by
utilities and has a broad range of applications.
The modified sine wave produced by the Inverter
The modified sine wave produced by your Whistler inverter has
a root mean square (RMS) voltage of 115 volts. The majority of AC
voltmeters measure RMS voltage and assume that the measured
waveform will be a pure sine wave.
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