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Diehl Static Inverters & Frequency Converters

Static inverters are used to produce AC power from DC. The DC power in this case comes from batteries. The AC is produced by using power semiconductors to chop up the DC into something that approximates a sine curve.

EAI is pleased to represent two manufacturers of aviation static inverters - Diehl Aerospace GmbH and L-3 Communications/EUROATLAS. The larger Diehl units are used to supply AC power to critical equipment in cases where only battery (DC) power is available.

OEM	Catalog No./ Model No.	Input	Output	Rated Power	Weight	Used On:
Diehl	4188-00	28VDC	115VAC at 400 Hz	1000VA	5.3kg	Airbus A318, A319, A320 & A321
Diehl	4190-00	28VDC	115VAC at 400 Hz	2500VA	13.5kg	Airbus A330 & A340
EUROATLAS	3010R & 3010S	22VDC to 32VDC	110VAC at 60 Hz (3010S also produced 220VAC)	40VA	1.6kg	Airbus A300 & A310

Because the AC supply on an aircraft runs at 400 cycles, it is necessary to slow it down so passengers can plug in their razors or other AC devices. The job of changing the 400Hz AC to 60Hz is performed by static frequency converters.

OEM	Model No.	Input	Output	Rated Power	Weight	Used On:
EUROATLAS	3025 & 3026	115VAC at 400Hz	115VAC at 60Hz (3026 also produces 220VAC)	40VA	740g	All Airbus except A300 & A310
EUROATLAS	4056 a “miniature” frequency converter	115VAC at 400Hz	115VAC & 220 VAC at 60Hz	10VA	83g	Used in bathrooms on all Airbus except A300 & A310

The term “static” is used to differentiate these devices from the old way of performing such tasks, before reliable and sufficiently powerful semiconductors came along. Then it meant using various forms of rotating machinery – motors, generators and alternators.

These are all single-phase devices. The EUROATLAS units are relatively inefficient with a power factor of 0.4 to 0.6, but that hardly matters since they are so small.

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