1. Burst Test Test-Bed LHC120A-10V 4 Quadrant Converter: Burst Tests
A converter is tested on all cables. Test specifically on “High Precision analog sensor cable” is done to show “Low Impedance 360° shielding” efficiency.
Iout
AC Mains Supply
Power Part
Voltage Source
Vout A B
Earth Circuit
Vref
I.A
Control WorldFip - I ref -
Digital Electronic
Current Transducers
I.B
DCCT Cable
4kV
E.U.T
This cable is really critical since ensuring integrity of analog high precision measured current used in loop regulation. Analog value is digitalized in the Digital Electronic though a 16bit Sigma Delta ADC. Current loop is then numeric, and provides voltage reference to the power converter acting as a power amplifier.
Burst Generator
Rack is only connected to ground by AC cable
Ground Copper Plane
Immunity
CEM RF & Hyper Europe st October 2008
Y. Thurel

2. Burst Test Results @ 120A DC
LHC120A-10V 4 Quadrant Converter: Burst Tests
I.Meas (1kHz sampling)
Burst Test 120A DC
4kV Burst OFF
Result of Burst test with adequate connector shielding: 4kV impact is not measurable.
2 ppm
4kV Burst On
A standard “queue de cochon” applied: shielding is degraded: 100ppm of error!!!
Cable Shielding continuity to connector = 2 cm path
100 ppm
4kV Burst On
Shielding not connected to connector is equal to “pig tail” case!!!! 100ppm of error!!!
No Cable Shielding continuity with connector
600 ppm
4kV Burst On
Immunity: Shielding Quality Impact
CEM RF & Hyper Europe st October 2008
Y. Thurel