Vector VEC049C owner manual 3.0THEORY OF OPERATION

3.0THEORY OF OPERATION

MAXX SST™ inverters change 12VDC into 110/120VAC RMS, electrical power. This is accomplished in two steps. (See FIGURE 4).

The	first	stage raises the 12VDC input to 145VDC. The advanced design
of	the	DC-to-DC first stage uses high-frequency conversion techniques

that replace bulky and heavy transformers found in older inverter technology. The output stage changes the 145VDC to 110/120VAC. This solid-state circuitry ensures excellent overload protection and the ability to operate reactive loads such as those found in inductive motors. The inverter’s output stage uses multiple banks of metal-oxide semiconductor field-effect transistors (MOSFETS). This stage functions as a high-power bipolar switch, alternately applying opposite polarity to the AC out- let HOT and NEUTRAL terminals.

See Specs for Wire Gauge and Fuse Amperage Page 18

Figure 4 Simplified Diagram

Some Models only include volt, Amp and over temp indicators.

The 110/120VAC output of the inverter is in the form of a modified sine wave (MSW) as shown in FIGURE 5. This type of waveform has the same energy char- acteristics as the sine wave of commercial electrical power. The modified sine wave is superior to the 100% square wave output (not shown) produced by most other DC-to-AC inverters on the market. A modified sine wave, as com- pared to a square wave, is vital to the efficient and proper operation of certain appliances such as computers, TVs, and certain electronic equipment.

Figure 5– Modified Square Wave and Sine Wave Comparison

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