Interested in a FCX Product?

What Are The Benefits Of A Simple Inverter Model?

Last time, I presented an example of a simple 3-phase inverter. An analogy was made to a 3-cylinder engine. (One cylinder per phase)

Using Pulse Width Modulation (PWM), each phase can appear to be more than the simple on/off which was shown in the timing chart.

blog5-1

By switching on and off very quickly, a series of gradually increasing and decreasing pulses can be created per phase. This makes the output more sinusoidal.

blog5-2

One limiting factor to consider from last time is that, “each switch carries the full-load amperage while it is on.”

Technically, there is a limit as to how large of a switching transistor is available from the manufacturers. One might think this limits the size of available inverters and frequency converters.

Think back to the 3-cylinder engine analogy. Imagine the limit on switching transistors to be a limit on cylinder size. How can we increase the engine size if the cylinders are as large as they can be? YES – add more cylinders.

At FCX Systems, on large inverters and converters, we shift out of the PWM mode and utilize the simple inverter model. By using 4 of the three phase inverters we create what works as a 12-cylinder engine. That creates more power and smoother output.

Power capability is 4 times that of a PWM single inverter. Shifting the timing of the inverters allows the creation of incremental steps in voltage. This is referred to as step wave modulation.

blog5-3

There is also a belief that the voltage increments create less transients and stress on windings and cables. This may prolong the life of the unit, while also providing higher power capabilities.

Normal recommendations are for the PWM design in ratings of 180 KVA and below. Above that level, the step wave design is preferred and available up to 2 MVA.

 

 

FCX INC. : U.S. Coast Guard 400 HZ Power Supply - Custom Enclosure

FCX INC. : U.S. Navy, NAS Oceana, VA 400 HZ Central System Converters

FCX INC. : U. S. Navy / 270 Volt DC Aircraft Power

FCX INC. : U. S. Navy , NAS, Patuxent River 400HZ Central System Converters

FCX INC. : Dallas / Fort Worth Airport Motor Generator Sets

FCX INC. : Edwards Airforce Base / F-22 Raptor 270 VDC Power Supply

FCX INC. : Grand Bahamas Shipyard 50 HZ, 2,000 KVA Solid-State Frequency Converter

FCX Systems Makes An International Footprint

FCX 3MVA Unit

Replacing Diesel Generators for the Patriot Missile System. Patriot Missiles, the defensive anti-missile system designed by Raytheon, are installed around the world to protect cities subject to missile attack. While utility power around the word is either 50 Hz or 60 Hz, the Patriot system incorporates several elements that require reliable 400 Hz power. Therefore, […]


 

Engineering Complex Power Supply for F-22 Test Program In the early 2000s, the engineering staff from Edwards Air Force Base (AFB) distributed an inquiry regarding a power supply for a 270 VDC military aircraft. FCX did not initially respond to the inquiry, however no viable solutions were presented by the 11 companies that did respond. […]


 

Powering F-35s Aboard Aircraft Carriers Anticipating the deployment of F-35 airplanes aboard aircraft carriers, the U.S. Navy issued a requisition for development of a system to feed power to 400 Hz AC and 270 VCD aircraft with a minimum impact on the existing equipment and space. FCX used its experience with the 400 Hz AC […]


 

Solid-State Frequency Converter for a Floating Dry Dock. In 2008, a large floating dry dock – containing motor loads for cranes, capstans, ballast pumps and fire pumps – was transported to the Grand Bahama Shipyard. The dry dock required 50 Hz power, while the Bahamas utilizes 60 Hz power. To supply the 50 Hz power […]


 

400 FCX Lane
Morgantown, WV 26501
304.983.0400

WORLDWIDE SUPPORT 24 / 7:
+1.304.983.0403
ISO 2001:2015

  • This field is for validation purposes and should be left unchanged.

Engineered For Endurance Since 1987 | ©2014 - All material is the intellectual property of FCX Systems and its affiliated companies
Manufacturing Marketing by BlaineTurner Advertising
Privacy Policy
 
304.983.0400 WORLDWIDE SUPPORT 24 / 7 » +1.304.983.0403