How This Inverter Works - Black & Decker PI100AB Instruction Manual

Controls and Functions
1. 12 Volt DC Vehicle Adapter Plug
2. Power plug adjusts 90°
3. USB Charging Port (with

HOW THIS INVERTER WORKS

This inverter is an electronic device that converts low voltage DC (direct current) electricity from a battery
to 115 volts AC (alternating current) household power. In designing this inverter, Black & Decker has
incorporated design techniques previously employed in computer power supplies. The result of these
design innovations is a smaller, lighter and easier-to-use power inverter.
The Power 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 145 volts DC. The second stage is a MOSFET bridge
stage that converts the high voltage DC into 115 volts, 60 Hz AC.
The DC-to-DC converter stage uses creative, high frequency, zero voltage switching power conversion
techniques that replace the bulky transformers found in less technologically advanced models. The
inverter stage uses advanced power MOSFET transistors in a full bridge configuration.
Power Inverter Output Waveform
The AC output waveform of this inverter is known as a modified sine wave. It is a stepped 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 small motors.
The modified sine wave produced by this inverter has an RMS (root mean square) voltage of 115 volts.
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 correctly read the RMS voltage of a modified
sine wave. Non-TRUE RMS meters will read about 20 to 30 volts low when measuring the output of this
inverter. For accurate measurement of the output voltage of this unit, use a TRUE RMS reading voltmeter
such as a Fluke 87, Fluke 8080A, Beckman 4410 or Triplett 4200.
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Tethered Protective Outlet
Cover)
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5
4. Power/Fault LED Indicator
5.Three-prong 115 Volt AC Outlet
(with Tethered Protective
Outlet Cover)
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2
4