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AE Techron 7796HC Power Amplifier DC – 200 kHz 22kW MIL-STD 704

Description

The AE Techron 7796 amplifier is a high-powered, DC-enabled unit designed to provide clean, reliable power for gradient coils in magnetic resonance imaging systems or in applications that require both significant short-term (burst) and long-term (continuous) power. A single 7796 has an output capability of over 210 amperes peak at its rated voltage. If more current is needed, up to four amplifiers can be combined in parallel and operate as a single system.

The 7796 can operate in either voltage or current mode and features robust output devices and a power range of over 6600 watts RMS. It provides very low noise and fast slew rates, and can safely drive a wide range of resistive, inductive loads.

Typical use includes as a self-contained, general purpose amplifier or combined into systems for doing three-phase or high-current testing required in ANSI-T1-315-2001 or MIL-STD-704.

Features

  • Over 22,000 watts peak for 40 mSec and 8,000 watts peak continuous into a 0.5-ohm load.
  • 40 mSec pulses of up to 209 amperes peak into a 0.5-ohm load
  • System output of over 650 volts and 250 amperes maximum are possible with multiple, interconnected amplifiers
  • Frequency bandwidth of DC to 50 kHz at rated power, DC to 100 kHz at reduced power
  • Rugged chassis for stand-alone or rack mounted operation. No additional power supplies are required
  • Protection circuitry protects the AE Techron 7796 from input overloads, improper output connection (including shorted and improper loads), over-temperature, over-current, and supply voltages that are too high or low
  • 7796 with “P” option offers precision control of output offset, DC drift and gain linearity
  • Shipped ready to operate from 208-volt (±10%) three-phase AC mains. Operation from 400-volt (±10%) AC mains are available on request

Specifications

AC Specifications

Standard

Ohms

PEAK OUTPUT

RMS OUTPUT

40mSec Pulse, 
30% Duty Cycle

5 Min, 
100% Duty Cycle

1 Hr, 
100% Duty Cycle

5 Min, 
100% Duty Cycle

1 Hr, 
100% Duty Cycle

Volts

Amps

Volts

Amps

Volts

Amps

Volts

Amps

Volts

Amps

Watts

open

181

0

181

0

181

0

128

0

128

0

0

16

159

12

159

10

159

10

112

7

112

7

795

8

159

19

154

19

154

19

109

13

109

13

1463

4

158

39

152

38

152

38

107

27

107

27

2887

2

157

79

*

*

141

71

*

*

100

50

5004

1.5

148

99

*

*

71

71

*

*

*

*

*

1

140

140

*

*

71

71

*

*

50

50

2509

0.5

106

209

*

*

63

127

*

*

45

90

3999

0.25

53

209

  

*Not tested

Optional High-Current (HC) Version

Ohms

PEAK OUTPUT

RMS OUTPUT

40mSec Pulse, 
30% Duty Cycle

5 Min, 
100% Duty Cycle

1 Hr, 
100% Duty Cycle

5 Min, 
100% Duty Cycle

1 Hr, 
100% Duty Cycle

Volts

Amps

Volts

Amps

Volts

Amps

Volts

Amps

Volts

Amps

Watts

2

79

39

79

39

79

39

56

28

56

28

1540

1

56

56

55

55

55

55

39

39

39

39

1512

0.5

53

106

52

104

50

100

37

74

35

71

2499

0.25

40

157

38

152

35

139

27

107

25

98

2432

Note: Performance levels typical up to 20 kHz frequency levels. Above 20 kHz, slew rate may affect performance, reducing maximum voltage, current and power output.

Frequency response

DC - 30 kHz, +0.1, -0.5 dB

8 ohm power response

DC - 50 kHz:  ± 150 Vpk

DC - 150 kHz:  ± 50 Vpk

DC - 200 kHz:  ± 25 Vpk

Maximum continuous output power

6600 watts RMS

Slew rate

41 V/μSec

Phase response

± 8.3 degrees (10 Hz - 10 kHz)

Unit to unit phase error

± 0.1 degrees at 60 Hz

Output offset

7796

< 5 mV, field adjustable to < 1 mV

7796P

< 200 µV

Output offset current

< 10 mill amperes DC

DC drift

7796  

± 1.5 mV

7796P

± 400 μV (from cold to max operating temp)

± 200 μV (after 20 minutes of operation)

Residual noise

Unfiltered

< 75 μV

Filtered

(400 Hz-30 kHz)

< 55 μV

THD

DC - 30 kHz < 0.1%

Input Characteristics

Balanced with ground

3 terminal barrier block connector 20k ohm differential

Unbalanced

BNC connector, 10k ohm single ended

Gain

Voltage mode

20 volts/volt

Current mode

20 amperes/volt

Gain Linearity (over input signal, from 0.2V to 5V)

7796  

0.1%

7796P

DC

0.0125%

AC

0.030%

Max Input voltage

± 10V balanced or unbalanced

Input impedance

20k Ohm differential

Input sensitivity

3.0V input for 3800W output into 1 ohm (adjustable)

Common mode rejection range

± 11 VDC max

Common mode rejection ratio

70 dB

Display, Control, Status, I/O

Front Panel LED Displays indicate

Run, Ready, Standby, Stop, and Fault conditions in the output stage

LCD Display

Lists type of fault condition and gives suggested corrective action

Soft Touch Switches for

Run (Enable), Stop, Reset

User Configurable

LCD display can be configured for up to four simultaneous displays reporting one, two or all four of the following: Voltage Peak, Voltage RMS, Current Peak, and Current RMS

Back Panel

Power Connection

NEMA-style locking receptacle; matching AC connector also included

Signal Output

4-position terminal barrier block

Signal Input

User-selectable Unbalanced BNC or Balanced Barrier Strip

Interlock Connector

25-pin D-sub connector used for amplifier control and status applications; also used in multi-amplifier applications

Communication Capabilities

Current Monitor

± 1V / 20A ±1%

Voltage Monitor

± 1V / 1V ±1%

Reporting

System Fault, OverTemp, Over Voltage, Overload

Control

Force to Standby; Reset after a fault

Protection

Over/Under Voltage

± 10% from specified supply voltage amplifier is forced to Standby

Over Current

Breaker protection on both main power and low voltage supplies

Over Temperature

Separate Output transistor, heat sink, and transformer temperature monitoring and protection

Physical Characteristics

Chassis

All aluminum construction designed for stand-alone or rack-mounted operation with black chassis; the amplifier occupies seven EIA 19-inch-wide rack units

Weight

153 lbs. (69 kg)

AC Power

Three-phase, 208 VAC ±10%, 47-60 Hz, 30A AC service. (400 VAC +/-10%, 20A version available)

Operating Temperature

10°C to 50°C (50°F to 122°F), Maximum Output Power de-rated above 30°C (86°F).)

Humidity

70% or less, non-condensing

Cooling

Forced air-cooling from front to back through removable filters via six 100 ft3/min. fans. No space is required between rack-mounted amplifiers. Air filters are removable from the rear via one fastener per side and may be eliminated if cabinet filtration is provided.

Dimensions

19 in. x 22.8 in. x 12.25 in. (48.3 cm x 57.9 cm x 31.1 cm). Unite occupies seven EIA 19-inch-wide rack units.

Standards

CISPR
CISPR 11
CISPR 14 - 1
CISPR 14 - 2
CISPR 14 - 2
CISPR 16 - 1
CISPR 16 - 2
CISPR 16 - 3
CISPR 16 - 4
CISPR 22
CISPR 24
IEC
IEC/TR EN 61000 - 1 - 1
IEC/TR EN 61000 - 2 - 1
IEC/TR EN 61000 - 2 - 3
IEC EN 61000 - 3 - 2
IEC EN 61000 - 3 - 4
IEC/TC EN 61000 - 3 - 5
IEC EN 61000 - 4 - 2
IEC EN 61000 - 4 - 3
IEC EN 61000 - 4 - 4
IEC EN 61000 - 4 - 5
IEC EN 61000 - 4 - 6
IEC EN 61000 - 4 - 7
IEC EN 61000 - 4 - 8
IEC EN 61000 - 4 - 9
IEC EN 61000 - 4 - 11
European
EN 50 081 part 1
EN 50 081 part 2
EN 55 011
EN 55 013
EN 55 014
EN 55 015
EN 55 020
EN 55 022
EN 55 024
EN 50 082 part 1
EN 50 082 part 2
EN 50 093
American
FCC Part 15
MIL-STD - 461E