June, 2016
www.us-
tech.com
Page 57
Advantages of Digital Signal Processing in Power Converters Continued from page 54
High-reliability electronic systems and com-
failure-free performance under stated conditions, usually over a specified amount of time. These electronic systems, down to component-level tech- nology, must be able to operate for many years without failure, often without the opportunity for repair, and in temperatures that can range from –55 to +85°C (–67 to +185°F). Bob Seidenberg, former senior quality assur-
ance manager at BAE Systems, describes the importance of high-reliability, ruggedized, digital inverters that were installed in the M1068, a com- mand communications variant of the U.S. Army’s M113 family of armored personnel carriers. BAE Systems is a global defense, security and aerospace company that designs and manufactures electronic systems for commercial and military use. The original M113 was first fielded in
Vietnam. To date, an estimated 80,000 M113s, including a long list of variants, have been pro- duced and used by over 50 countries worldwide, making it one of the most widely used armored fighting vehicles of all time. The personnel carrier has been
updated over the years to meet the ever-increasing demands of the battle- field. The M1068 is an upgraded and reconfigured M113 vehicle, introduced as a tactical operations center capable of long-range communications. It includes a 4.2 kW auxiliary power unit (APU) mounted on the right front of the vehicle to provide 24 V power. As a part of this project, BAE
Systems required two hi-rel, ruggedi- zed 2,500 W pure sine wave inverters per vehicle to convert 24 VDC power generated by the APU into usable multi-kilowatt levels of AC for power- ing communications, lighting, com- puters, and other electronic devices. The inverters also had to meet shock and vibration requirements for use in the field. Although more expensive, pure
sine wave inverters provider cleaner, utility-grade power than quasi-sine wave models. Pure sine wave invert- ers are ideal when operating sensi- tive electronic devices, including com- munications equipment, that require high-quality waveforms with little harmonic distortion. In addition, pure sine wave mod-
els have a high surge capacity which means they are able to exceed their rated wattage for a limited time. This enables vehicle motors to start easily, which can draw many times their rated wattage during start-up.
Withstanding Force “The shock requirement for the
inverters installed on the M1068 was close to 30 g, in three directions (ver- tical, horizontal and transverse), and the vibration spectrum was also very demanding,” says Seidenberg. “MDL was able to meet those requirements with a pure sine wave inverter design that was basically indestructible.” According to Kazem, despite the
30 g requirement for the M1068, the military specified that the inverters had to be able to withstand forces of up to 100 g. This was well beyond the amount of shock that the vehicle would ever realistically experience, based on military tests conducted in the roughest terrain that maxed out at 15 g. Still, the company was able to deliver pure sine inverters that met the challenge. “The military has a number of
requirements that we had to follow,” adds Seidenberg. “So, naturally, our supplier had to pay a lot of attention to those requirements and ensure that they were met in a way that was correct for the application.”
Dr. Mike Bixenman, CTO
ponents are no longer the exclusive domain of aerospace and defense. Today, medical, trans- portation, communications, infrastructure, and industrial sectors all have applications where the price of failure is high. These types of power converters may not have
to withstand the same extreme conditions as those for the military, but vibration, shock, humidity, and other inherent environmental problems are still factors, so their need for hi-rel and rugged power converters certainly applies.
DSP and Modular, Stackable Inverters DSP is also a key element in a new genera-
tion of modular, stackable inverter options designed to provide a range of 1-20 kW of DC/AC power in a single, customizable unit. This type of system, available from custom
power converter designers like MDL, consists of rack-mounted inverter modules that can be
stacked in a parallel configuration, enabling the user to add as many inverters as needed to meet the power requirements. Each unit connects to a communications con-
troller, which is responsible for synchronization, load sharing and any external communications. The individual inverters are hot-swappable, which allows for the addition or replacement of modules on the fly. Digital signal processors provide project man-
agers with a system that fits their power require- ments without having to develop a new unit for their specific project. This eliminates the need for many application-specific designs, and can also enable faster delivery of the power converter at a much lower cost. Contact: Magnetic Design Labs, Inc., 1636
Edinger Avenue, Unit 1, Santa Ana, CA 92705 % 714-558-3355 fax: 714-558-8125 E-mail:
sales@magneticdesign.com Web:
www.magneticdesign.com r
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