How This Inverter Works - Black & Decker BDI750 Instruction Manual

FEATURES
The front panel provides three LED indicators. The green LED indicates power and proper operation of the
inverter. The AC and USB outlets are ready to use. The red LED indicates inverter shutdown from an over-load,
Yellow LED lit fault and indicates an input fault or over temperature. (If the red or yellow Fault LED Indicator
lights, refer to the Troubleshooting Section of this Instruction Manual.)
The Power Pushbutton turns the inverter ON and OFF. It can also be used to force reset of inverter circuits by
pressing it OFF (no LEDs are lit), then back ON again.
AC power is supplied through a standard outlet.
Controls and Functions
NEGATIVE DC POWER
CONNECTION
OUTPUT FAULT

HOW THIS INVERTER WORKS

This inverter is an electronic device that converts low voltage DC (direct current) electricity from a battery to 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.
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). 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.
AIR VENT
HIGH SPEED COOLING FAN
POWER
ON/OFF
PUSHBUTTON
20
AC OUTLET
POSITIVE DC POWER
CONNECTION
INPUT FAULT