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WORKING PRINCIPLES
HOW YOUR INVERTER WORKS
The inverter converts low voltage DC (Direct Current) from a Greenworks™ 80V lithium battery
to standard 120 volt AC (Alternating Current) household power.
PRINCIPLE OF OPERATION
The inverter converts power in two stages:
• The first stage is a DC to DC conversion process that raises the low voltage DC at the inverter
input to high volts DC.
• The second stage is the actual inverter stage that converts the high voltage DC into AC.
The DC-to-DC converter stage uses modern high frequency power conversion techniques
that have replaced the bulky transformers found in less technologically-advanced models. The
inverter stage uses advanced power MOSFET transistors in a full bridge configuration.
THE OUTPUT WAVEFORM
The AC output waveform of the IV80A00-series inverter is known as "modified sine wave". It is
a waveform that has characteristics similar to the sine wave shape of utility power. This type of
waveform is suitable for most AC loads, including linear and switching power supplies used in
electronic equipment, transformers, and motors. (See Figure 1).
The modified sine wave produced by the IV80A00-series inverter has an RMS (root mean
square) voltage of 120 volts, which is the same as standard household power. Most AC
voltmeters (both digital and analog) are sensitive to the average value of the waveform rather
than the RMS value. They are calibrated for RMS voltage under the assumption that the
waveform measured will be a pure sine wave. These meters will not read the RMS voltage of a
modified sine wave correctly. They will read about 20 to 30 volts low when measuring the output
of the inverter. For accurate measurement of the output voltage of this unit, use a true RMS
reading voltmeter.
Fig. 1
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