Power supplies

 

A direct current supply is a static device with one or more entries and one or more exits which transforms a system of alternating voltage and alternating current and/or direct current voltage and direct current into a system with direct current voltage and direct current through electromagnetic induction, usually with different values, for the purpose of transmitting electrical energy.

Requirements

The design-related differences between direct current supplies are determined mainly by their intended utilisation. The respective requirements are set fourth in the installation and device standards (e.g. VDE 0100, VDE 0113/EN 60204/ IEC 60204, VDE 0700/EN 60335/ IEC 60335, VDE 0805/EN 60950/ IEC 60950) and in the available standards for direct current supplies for general end use (e.g. VDE 0570/EN 61558/IEC 61558, VDE 0557/EN 61204/IEC 61204).

An important selection criterion is the construction of insulation between input and output circuits, as has already been described above under “Transformers, Requirements”.

A distinction continues to be made following the conversion of alternating voltage/alternating current/AC and direct current voltage/direct current/DC:

• AC/DC converter
  input alternating voltage, output direct current voltage
• DC/DC converter
  input direct current voltage, output direct current voltage

The stability and ripple of the output direct current voltage is a further important selection criterion. A distinction is made between

• Unregulated direct current supplies
• Regulated direct current supplies

Standards

Unless otherwise agreed upon with the ordering party, we manufacture in accordance with the latest “State of Technology” and with the following standards:

Unregulated direct current supplies

• VDE 0570: Sicherheit von Transformatoren, Netzgeräten und dergleichen Teil 1: Allgemeine Anforderungen und Prüfungen, in Verbindung mit dem jeweilig zutreffenden Teil 2.
  EN 61558, IEC 61558: Safety of power transformers, power supply units and similar, Part 1: General requirements and tests, in accordance with the relevant Part 2.Regulated direct current dupplies
• VDE 0570: Sicherheit von Transformatoren, Netzgeräten und dergleichen, Teil 1: Allgemeine Anforderungen und Prüfungen, in Verbindung mit dem jeweilig zu-treffenden Teil 2.
  EN 61558, IEC 61558: Safety of power transformers, power supply units and similar, Part 1: General requirements and tests, in accordance with the relevant Part 2.
• and/or:
  VDE 0557: Stromversorgungsgeräte für Niederspannung mit Gleichstromausgang
  EN 61204, IEC 61204: Low-voltage power supply devices, D. C. output – Performance characteristics and safety requirements.
• and/or: VDE 0805: Safety of information technology equipment
  EN 60950, IEC 60950: Safety of information technology equipment