S11/16 Series Switching AmplifiersThese amplifiers are intended for large systems. They are based on a half bridge, FET switcher PWB. The OUT-11 is rated at 1,000 VA. The OUT-16 is a higher powered PWB with more FETs which are rated at higher voltage and is rated at 2,500 VA. The OUT-16 design has just been finalized, but the circuitry and parts stress is virtually the same as the OUT-11. Due to the lower parts count, reduced wiring, and higher power density, the S16 is more compact and less expensive per watt than an equivalent S11. Instruments, Inc. has delivered over 12,000 OUT-11 PWBs since 1987. The reliability of the OUT-11 has been very good. Actual experience has proved greater than a 290,000 hour MTBF per Output PWB. A pair of boards forms a full bridge. Fast rectifiers and drivers are used for maximum efficiency. Full modulation control is allowed. The transistors are fully protected against load faults, excessive switching frequency, cooling failure, and start-up or power-down transients. The various models of amplifiers are designated S11-xxm or S16-xxm where xx is the number of output boards and m is an optional modifier for special applications. These amplifiers are complete, having a suitable power supply, input preamp and an output filter/transformer system. AmplifierModels smaller than the S11-8 are rack mounting, therefore the size and weight is for the amplifier only. The models S11-8 and larger are delivered in a structure (rack), therefore their size and weight is the total and includes the "rack". Multiple cabinets may be designed into a system. The outputs are usually combined in series, since they are voltage sources. The output transformers in models S11-2 through S11-24 are mounted from the front. These transformers may be designed for operation down to 50 Hz, however this reduces the high frequency performance and increases the weight slightly. In addition, models smaller than the S11-32 may be designed as specials to pass through a submarine hatch. The larger models have rear mounted transformers which operate down to 200 Hz and are not designed for submarine use. InterfaceThe Interface function is accomplished with an analog Pre-Amp, analog output voltage and current monitors, and digital Fault Detection and Fault Location information. If needed, a summing transformer is included for load matching and/or high voltage output. Power SupplyIn our switching amplifiers, reactive currents are returned to the power supply. Thus, when driving a load with a power factor of 0, either capacitive or inductive, the power drawn from the primary AC source is only 15% of the output VA. Any real power delivered to the load increases the primary AC power. With a resistive load, at full power, the overall efficiency is about 75%. OUT-11 1 kW Half Bridge Switching PWB. (Click image to enlarge)
Specifications for Standard S11/16 Series Amplifiers
Individual Specifications
Models with an "A" have no cabinet, power supply, or output
transformer. Some models are available in a Multi Channel configuration.
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