The Ansmann range of power supplies provides a wide range of solutions for any application, and as with all Ansmann products, their power supplies are manufactured to the highest quality. To ensure quality, all power supplies are tested to adhere to many of the modern standards for electrical products.

This standard range covers basic unregulated plug-in power supplies right up to high power switch-mode desktop power supplies which can deliver up to 50W output power. Cell Pack Solutions are working closely with Ansmann and if you can't see a power supply below which meets your requirements then please let us know by filling in a Specification sheet; we may be able to find another standard product but if the quantities are large enough then a product can be developed to meet your requirements.

Which Power Supply?

There are many different power supplies available and choosing the right one is important to ensure your application will run correctly.

Output Voltage and Output Current

The first most important specifications of a power supply are the Output Voltage and Output Current. The voltage of the power supply must match that of the input voltage of you appliance; it cannot be under as the power supply will not be able to provide enough power to the device. If it is over then the appliance could be damaged by due to the excess power being forced into the appliance. There is however a tolerance on the output voltage of power supplies, generally in the region of 10% either way of the rated voltage.

The Output current rating of the power supply must be equal or greater than the input current rating of the appliance to be powered. The appliance needs to be able to draw the amount of current rated in order to run so the output current must be at least equal to that. The power supply having a greater output current is not a problem, the device will run fine as with a regulated power supply, the device will only draw the current it needs from the power supply and the extra output will not be forced into the application.

Power Supply Type

There are three main types of power supply available and they can be categorised by the electronics used to make them; these are:

1. Linear Unregulated:

a. These are the cheapest form of power supply.
b. Convert the AC mains power into DC output via a transformer, the output voltage is unregulated which means that the output may not match up completely to that rated on the supply. This means that these supplies can only be used on appliances which input are not sensitive or have regulated circuitry fitted to the input.
c. Low EMF (Electromagnetic Field) radiation and so do not effect other sensitive electrical equipment and can be used in environments where low EMFs is needed.
d. Quite large and heavy construction.

2. Linear Regulated:

a. More expensive than the unregulated type.
b. Same technology as the unregulated type but with regulated circuitry fitted so the output voltage is stable and will be that rated on the supply. This is the best type of power supply for sensitive applications.
c. Low EMF (Electromagnetic Field) radiation as with Linear Unregulated.
d. Same size and weight as unregulated type.

3. Switch Mode:

a. Generally the most expensive of the three types of power supply.
b. Different technology to linear, for converting AC mains power to DC regulated power using a high frequency switch with a varying duty cycle to maintain the output voltage. This type of technology is improving but us not yet as stable as linear power supplies, and voltage spikes can appear at the output so care needs to be taken when using sensitive equipment.
c. High EMF (Electromagnetic Field) radiation compared with linear power supplies.
d. Much smaller and lighter than linear power supplies.
e. Only technology which enables the power supply to function world-wide (i.e. input voltage of 100-240V AC).

A final point when purchasing power supplies are the standards which they are manufactured and tested to; the application of the power supply will dictate which standards the power supply must conform to. It very important to be aware of standards so we've compiled a list of some of the most important standards which Ansmann Power Supplies meet which standard.

Two common standards:

• EN60950: (Low Voltage Directive) General standard for Low Voltage devices used in the household covering "Audio, video and similar electronic apparatus - Safety requirements".
• EN61-558: General standard for safety of power transformers, power supply units and similar, variants of this standard can be applied to commercial environments.