COMPARISON AC + DC VS. COUPLING TRANSFORMER

Coupling Network Transformers (CDN)
LV 123

For voltage ripple tests on HV batterie lines there is an easy and economical solution. We use standard HV power supplies. Our 4 quadrant amplifier system 110-75N-TS generates powerful sine interferences. The BOLAB coupling transformer 450-100 (100 A) allows for high frequency sine signals. The BOLAB measurement unit 480-WM measures the AC amplitude that is provided directly to an analogue input of the BOLAB 4 quadrant amplifier. BOLAB´s WaveMaster software compares reference signals with measured signals and adjusts automatically the amplitude to meet the automotive standards requirement. Please note that only one sine wave interferences are possible. Load Dump transients are not feasible.

High Voltage DC Power Supply + 4 Quadrant Amplifier in series
LV 123 + VW 80300

As coupling network transformers (CDN) are limited in speed, frequency ranges, amplitude and especially allow only sine interferences, this solution cannot be used for Load Dump applications. Load Dump requirements are both part of LV 123 and VW 80300 standards. Our most flexible solution is the combination of a high voltage power supply in series to our 4-Quadrant Amplifiers. Individual transients and even Load Dump requirements are possible. In addition, BOLAB’s modular design allows the adaption to almost all manufacturers of high voltage power supplies. There is no need to purchase an additional power supply if one is already available.

Advantages

Easy setup
Economical
Modularity. Several amplifiers and coupling transformers can be operated in parallel to obtain high currents.

Advantages

High flexible
Transient interfaces
Load Dump possible
High frequency range

Disadvantages

Only sine interferences
Limitation in frequency range
Limitation in amplitude
No Load Dump possible

Disadvantages

Higher in price in comparison to coupling transformers

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