8720

DC-250kHz Switch-Mode Amplifier

8720

20 kW (up to 120 kVA), up to 400A continuous, three-phase

Key Performance Capabilities:

Bandwidth: DC to 250 kHz
Voltage: 0 to 250 V_RMS; 0 to 350 VDC
Slew rate: Up to 300 V/µs
Current: Up to 300 A_RMS*
Distortion: <0.8%
Power: 20 kW*
Power levels up to 4X rated power when driving reactive loads
High power efficiency and density

*Models available with output power from 4 kW to 24 kW (capable of up to 96 kVA).

SKU: N/A Category: Amplifiers

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OVERVIEW

8720 amplifiers are 400Vp, low-noise, DC-to-250-kHz switch-mode amplifiers. They are fast enough for DC automotive dropout testing and capable of AC voltages required for ISO 61000 and Aviation testing. Plus, they have low enough noise and distortion specifications to be the reference power source in power quality measurements. 1.1 Features Wide Bandwidth and Flexible The 8720 amplifier is capable of reproducing AC, DC and AC+DC waveforms into loads from a dead short to high impedance. It can be used to simulate a battery at 13.5 VDC or be an AC source with a L-N potential of up to 140 VAC. Rated current, for a given voltage, is available for all waveform types (AC, DC or AC+DC) at frequencies from DC to 250 kHz. Voltages from 0 to 260 VRMS are available with no changes in configuration.

The 8720 excels when it comes to driving reactive loads. As frequencies increase, the effective impedance of the load becomes a much larger part of the total load to be driven (especially with inductive loads like coils). However, when driving reactive loads, the 8720 is capable of receiving, reprocessing and returning to the load up to 4X its rated power. The result is a bench top system capable of 10 kVA+ output while drawing less than 20 kW of AC mains power.

Configurable: A key to everyday product usability is quick and easy product (re)configuration. The 8700 Series provides all key configuration controls on the back panel of the unit. Configuration options available include:

GAIN: Fixed or variable gain (0 to 40)
CURRENT LIMIT: From 5% to rated limit (to protect fragile DUTs or where specified in the Standard)
DC CONTROL: DC enabled or DC blocked and DC Servo (for driving transformer-coupled loads or coils)
INPUT: Balanced and/or unbalanced
MODE: Voltage source or current source
OUTPUT IMPEDANCE: Variable from 0 to 1 ohm (Voltage mode)
SENSE: Correction to voltage drops to the load

OUTPUT CHART

Output

CONTINUOUS AC OUTPUT CURRENT							CONTINUOUS DC OUTPUT CURRENT*
VOLTS RMS	8704	8708	8712	8716	8720	8724	VOLTS DC	8704	8708	8712	8716	8720	8724
60	60	120	180	240	300	360	13.5	55	110	165	220	275	330
120	32	64	96	128	160	180	24	55	110	165	220	275	330
230	10	20	30	40	50	60	48	55	110	165	220	275	330

Note: 8704 power ratings shown are for unit configured for 240VAC. At output voltages above 90VAC, units confirgured for 120VAC mains input may be breaker limited. Contact AE Techron for 120VAC performance ratings. Performance data is for a purely resistive load; performance will be improved into loads that are partially or completely reactive.

PERFORMANCE

SPECIFICATIONS

Performance Specifications

Operating Modes: AC, DC and AC + DC
Frequency, AC Mode Output (-3 dB): DC – 250 kHz
Max Voltage Ranges (no load):
- AC: 0 – 260 VRMS
- AC + DC: 0 – ±400 VP
Max Continuous Output Current: 300A RMS
Surge Rating: 2X power at up to 400Vp or 750A
Apparent Power Rating: Up to 4X continuous power rating at up to 400 Vp or 750A
Supply Voltage: three-phase, 208V ±10% 60A, 50/60 Hz, 400V ±10%, 60A version available
Load Regulation (full scale): <0.025%, DC to 100 Hz; <0.05%, 10 Hz to 10 kHz
Line Regulation (full scale): <0.1% for 10% line change
External Sense: Voltage-drop compensation sense line
Harmonic Distortion (80 kHz, low-passed): Less than 0.3% from 10 Hz to 30 kHz; 0.5% up to 50 kHz
Harmonic Distortion (30 kHz, low-passed): Less than 0.1% from 10 Hz to 50 kHz
DC Offset: <10 mV
Distortion: <0.8%
Voltage Slew Rate: Load dependent; up to 300V per µs, typically 8 µs for 10% to 90% of full-scale change depending on load and power
Efficiency: 85%, typical
Power Factor: .72, typical
Source Impedance: 2.7 mΩ + 1.25 µH
Cooling: Internal forced-air fans
Protection: Over/under voltage, over current, over temperature
Input, Signal In:
- Unbalanced: BNC connector
- Balanced: Terminal strip
Output: 3/8-inch high-current post connectors

Operating Environment

Temperature: 5 °C to 50 °C (41 °F to 122 °F);
- Maximum output power derated above 30 °C (86 °F)
Humidity: Maximum relative humidity 80% for temperatures up to 31 °C decreasing linearly to 50% relative humidity at 40 °C
Altitude: 3000 m Maximum
Environment: Indoor Use Only, Pollution degree 2
Equipment Class: Group 1 Class A
Transient Overvoltage: Overvoltage Category II
Dimensions (HxWxD): 42.05 x 22.56 x 31.56 inches (106.81 x 57.3 x 80.16 cm)
Weight (approx): 540 lbs. (244.9 kg)