6 | SAMLEX AMERICA INC.
SeCTIOn 2 |
Features, Applications &
Principle of Operation
• Low Interference Technology for controlled RF noise
• Ideal for RV’s, Trucks and remote housing
2.3.1 Soft Start technology
This feature offers the following advantages:
• When the Inverter is switched ON, the voltage ramps up to 115 VAC in around 2 sec.
If the load was already oN at the time of switching oN of the Inverter, starting surge
current demanded by certain reactive devices like motors etc. will be reduced and
there will be less likelihood of the Inverter shutting down due to overload.
• If the Inverter is switched ON first and then a load with higher starting / inrush cur
-
rent like SMPS / motor is switched oN, the voltage will dip momentarily and then
recover to reduce inrush / starting surge current in the load as above.
• Similar overload reduction will be initiated during any other sudden higher
loading conditions.
2.3.2 Low interference technology
Innovative circuit design and noise filtration circuitry reduces rf interference in TV
picture, audio and radio equipment.
2.3.3 cool Surface technology
Normally, heat dissipating components are mounted directly on internal metal chassis
surface of the unit and hence, the chassis surface may rise to unsafe touch-temperature.
In this unit, heat-dissipating components are not mounted directly on the chassis of the
unit but on PCB (Printed Circuit Board) mounted heat sink and, there is air gap between
the heat sink and the chassis surface. The heat sink is cooled by load-controlled fan.
As there is no direct contact between the heat sink and the chassis, the chassis surface
remains much cooler and is safer to touch.
2.3.4 Load controlled cooling fans
Cooling is carried out by convection and by forced air circulation by 2 load-controlled
fan. The fan will normally be off and will be switched oN automatically as follows:
• Inverter supplying AC load(s): When load(s) ≥ 85W
• Battery Charging/AC Pass Through Mode: When charging current ≥ 3A ± 1A
This will reduce energy consumption by the fan and will increase overall efficiency.
2.4 principLe of operation - inverter
Conversion of 12 VDC from the battery / other DC source to 115 VAC takes place in 2
stages. In the first stage, the 12 VDC is converted to high voltage DC (around 160 VDC)
using high frequency switching and Pulse Width Modulation (PWM) technique. In the
2nd stage, the 160V high voltage DC is converted to 115V, 60 Hz Modified Sine Wave
AC. (
note:
115V is the rMS value of the Modified Sine Wave AC voltage. The peak
value of the Modified Sine Wave AC voltage will be equal to the value of the above
high voltage of around 160V. See the fig 2.1).
Summary of Contents for SAM Series
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