DC Source / Sink
Voltage, Current, Power: Is that all there is to a Power Unit?
These three parameters are the first things that come to most users’ minds when they are looking for an industrial power unit for testing rig applications. These are of course immutable parameters when it comes to designing a power unit, but there are many other properties that decide whether you have actually found the right power unit for your particular area of application.
Signal Quality and Residual Ripple
Signal quality is another crucial parameter: If a DC source / sink is needed for an EMC testing rig, it is in fact THE deciding criterion for the output voltage. To simulate a battery with real DC voltage, a minimum residual ripple is essential too.
For Heinzinger’s testing rig energy systems, this is a typical application: With a residual ripple of much less than 0.2 % Unorm over the entire range from 0 - 1 MHz, and with exceptional temperature stability, the ERS series from Heinzinger is designed for precisely this application.
High Demands in Terms of Dynamics
During typical tests of components from the automotive sector, LV123 makes especially tough demands on the dynamics of the power units. With conventional power units, the falling signal flanks cannot be measured in the time required because the output capacities are unable to discharge fast enough via the test object.
The DC sources / sinks in the Heinzinger ERS series are designed for such tests. Thanks to their structure as two quadrant actuators, the testing rig energy systems actively feed back into the grid. Both the rising and the falling signal flanks can be generated easily at up to 800 A/ms. The switch from supply to feedback mode takes place smoothly and is determined by the user’s specification of the target value.
Compact and Low-Noise Power Units
Space requirements and noise levels are further important criteria when it comes to choosing the right power unit. Heinzinger DC sources / sinks in the ERS series are water-cooled and can therefore be set up with a very compact footprint. Cooling with water is more effective and protects the performance electronics more reliably against overheating than an air-cooled system, which in turn has a long-term effect on a power unit’s lifespan. Another positive effect of water cooling is that Heinzinger DC sources / sinks produce only low amounts of noise. There is therefore no need for additional sound insulation.
Low-inductance Structure, Output Relays and Fast Discharge Circuits for Safety
Another property that is especially important for dynamic applications with high currents is the low-inductance structure of the DC source / sink and the test setup. With currents of up to 1,000 A or more, every meter of connected load acts like parasitic inductance and has a negative influence on the dynamism of the overall structure. Added to this is the fact that some test objects and test setups can act as energy stores and, in the event of fault, become a source of danger for the operator.
The potential danger can be minimized with the output relays and active fast discharge circuits in the Heinzinger testing rig energy systems.
We would be happy to advise you on the design of your test setups. Call us on +49 8031 2458 0 or send an e-mail to info(at)heinzinger(dot)de