How Power Inverters Work - PowerBright PW900-12 Mode D'emploi

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HOW POWER INVERTERS WORK

There are two stages in which a power inverter changes the 12V DC (or battery) power into
110V AC (household current).
STAGE 1:
The inverter uses a DC to DC converter to increase the DC input voltage from the power
source to 145V DC.
STAGE 2:
The inverter then converts the high Voltage DC into 110V AC (household current), using
advanced MOSEFT transistors in a full bridge configuration.
This design provides all PowerBright™ inverters with the capability to start and run difficult
reactive loads, while providing excellent overload capability. The waveform that is generated
by this conversion is a modified sine wave as shown in the diagram below.
MODIFIED SINE WAVE
The modified sine wave produced by our inverters has a root mean square (RMS) voltage
of 110V. The majority of AC voltmeters are calibrated for RMS voltage and assume that the
measured waveform will be a pure sine wave.
Consequently, these meters will not read the RMS modified sine wave voltage correctly
and, when measuring the inverter output, the meters will read about 20V to 30V too low. To
accurately measure of the output voltage of the inverter, use a true RMS reading voltme-
ter such as a Fluke 87, Fluke 8060A, Beckman 4410, Triplet! 4200 or any multimeter
identified as True RMS.
More than one filter may be required. These filters are available at most electronic supply
stores.
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