S16 Series Switching Amplifiers

These amplifiers are intended for large systems. They are based on a half bridge, FET switcher PWB. The OUT-16 has more heatsink and more FET's than the OUT-11 and is rated at higher voltage. A pair of OUT-16 PWBs is rated at 5,000 VA. The OUT-16 circuitry and relative parts stress is virtually the same as the OUT-11. Due to the lower parts count, reduced wiring, and higher power density, the S16 amplifiers are more compact and less expensive per watt than an equivalent S11. Nearly 2 megawatts worth of OUT-16 PWBs have been delivered.

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 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.

Amplifier

The OUT-16 may be configured to be either air cooled or conductive cooled. We have delivered over 20 S16-20 amplifiers as air cooled units and several S16-16B amplifiers as water cooled, sealed units for open deck operation.

Interface

The 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 unusual load matching and/or high voltage output.

Power Supply

In 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%.

The power supply may be regulated or unregulated. When a regulated supply is used, the DC voltage will be at the rated voltage for the output PWBs, resulting in the maximum output VA possible. Our regulated supplies have a power factor of 70%.

Our unregulated supplies have the advantage of a power factor of 94-98% at full load. The disadvantage of an unregulated supply is that the maximum rated voltage for the output PWBs is established at high line and no load. At low line and full load, the DC voltage is less, therefore the available output VA of the amplifier is less.

OUT-16 2.5 kW Half Bridge Switching PWB.

(Click image to enlarge)

Specifications for Standard S16 Series Amplifiers

Type of amplifier	Full bridge equivalent, FET output, Switching
Modulation	Squarewave, Stair-Step, or PWM

Load power factor range	0 - 100% capacitive or inductive
Distortion (THD)	PWM: 2% max, 0.2% typical
Frequency range (-3 dB)	PWM: 300 Hz to 20 kHz

RMS noise (PWM only)	-60 dB gated on
- - below max output	-120 dB gated off

Current monitor	100 mV/A
Voltage monitor	2 mV/V
Protection	No combination of passive loads, input signals or
	switch settings will cause amplifier failure.
Fault lights	Temp limit, voltage limit, current limit, blown fuse
Ambient temperature	0 - 40 degrees C

Primary power (standard)	480 or 600 V 60 Hz 3 ph
Contact factory for other voltages

Individual Specifications

Model	S16-16L	S16-16B	S16-20	S16-32B	S16-32
Quantity of Chanels	4	4	1	1	8
Output ea channel - cw	4,000	4,000	19,000	40,000	3,000
Output ea channel - burst	8,000	13,000	42,400	80,000	7,000
Burst Duration - sec	28	10	100	100	10
Duty cycle	25%	10%	20%	20%	20%

Width (inches overall)	27	21	35	28	35
Depth (inches overall)	32	28	31.5	27	31.5
Height (inches overall)	65	24	35.5	39	54

Weight (pounds)	1,300	400	985	800	1,600
Amplifier Photograph	S16-16	S16-16B	S16-20	S16-32B	S16-32

Units ending with B are DC powered

S16-20 - Stackable in pairs

S16-16B - 4 Channel – External Water Cooled

Specifications and prices subject to change without notice.