Portable power supply units with galvanic grid isolation capabilities

Voltcraft is releasing the CSP series, a lineup of twelve compact power supply units currently showcased on the Conrad Sourcing Platform. The hardware provides varied alternating current (AC) and direct current (DC) voltage configurations designed specifically for research and development (R&D), industrial maintenance, and vocational training applications.

Galvanic Isolation and Battery Operation
Four specific models within the series (CSP-300, CSP-310, CSP-320, and CSP-400) feature an integrated battery mode alongside standard voltage converter operation. Operating the units on battery power physically disconnects the power supply from the main grid, achieving 100 percent galvanic isolation. This mechanism prevents grid-induced signal interference and provides a low-noise power source. In R&D and training environments, this isolation allows engineers to accurately visualize complex AC phenomena, as well as coil and capacitor behaviors, using an oscilloscope without introducing ground loop distortion.

Hardware Specifications and Output Parameters
The series encompasses models with power outputs ranging from 18 to 90 watts and current outputs between 1 and 6 amperes. The units provide voltage outputs up to 30 VAC or VDC depending on the specific model architecture. For specialized diagnostic tasks, the CSP-140 unit generates a symmetrical DC output of -15 V, 0, and +15 V. Symmetrical voltage configurations are frequently required for powering operational amplifiers and analog signal processing circuits during benchtop testing.

Alternating Current and Frequency Control
To support field diagnostics such as rapid transformer and transducer testing, several units are engineered with dedicated AC capabilities. The CSP-240 model provides an output of 1 to 15 VAC at 1.5 A, integrating an adjustable frequency controller that spans from 1 to 400 Hz. Additionally, the CSP-200 model features stepped AC voltage presets at 2 V, 4 V, 6 V, 8 V, 10 V, and 12 V to facilitate standardized testing procedures without requiring manual voltage calibration.

Engineering Perspectives
"Each of our twelve new ultra-compact and versatile models has been designed for the respective needs of either R&D, MRO or the educational sector," stated Harald Lehner, product category manager at Conrad Electronic. "All types come with their own specs including true AC and symmetrical DC voltage outputs."

Additional Context
This section details technical specifications and competitive benchmarking not included in the original news release.

In the portable test and measurement market, ultra-compact benchtop power supplies compete with low-wattage diagnostic equipment from manufacturers such as B&K Precision, PeakTech, and Siglent. Traditional benchtop power supplies typically rely on standard AC mains power and linear or switching regulation, making them stationary and susceptible to main grid noise unless paired with external isolation transformers. The integration of internal battery operation to achieve absolute galvanic isolation in a compact, sub-100W class form factor is a specialized architectural approach. Furthermore, standard portable DC power supplies generally lack native variable frequency AC outputs. The 1 to 400 Hz AC capability addresses a specific technical gap, as engineers typically must pair a standard DC supply with a separate arbitrary waveform generator to test AC-dependent components such as transformers and transducers.

Edited by Aishwarya Mambet, Induportals Editor, with AI assistance.

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