Allows customers to isolation test self-configured power supplies from input to output to 6kV DC. Nick Flaherty reports
Excelsys Technologies Xgen Medical Range of power supplies has been enhanced to include 1 x MOPP (Means of Patient Protection) approval from input to earth (ground) for patient connected equipment. Furthermore the improved products now allow customers to isolation test self-configured power supplies from input to output to 6kV DC.
The enhancements include the introduction of Y1 capacitors and Type Testing at 5675V DC (the DC equivalent of 4kV AC), from input to output. Carrying full UL60601-1 and EN60601-1 3rd edition approvals, the range provides low leakage current (less than 150µA available) as well as meeting the stringent creepage and clearance requirements of medical equipment.
Dielectric testing is a simple method of verifying the adequacy of electrical insulation to withstand the peak voltages that can occur during transient events.
However, this can be a destructive test and is generally categorised as a 'Type test'. 'Type tests' are investigations carried out by Safety Agencies and are intended to prove that the construction of the power supply meets the requirements dictated by the relevant safety standard. However, Reinforced (primary to secondary) Insulation cannot be tested without over-stressing basic insulation on the end product and it is because of this the agencies allow manufacturers to test reinforced insulation separately. This means they are allowed to test transformers and other primary to secondary isolation barriers separately before components are incorporated into the product.
In order to meet customer demand to be able to verify this as part of their production process Excelsys has released an enhanced range of medically approved Xgen power supplies. This product has been specifically designed to withstand the DC peak equivalent of the 4kV AC isolation test from primary to secondary. (See UL60950-1, C5.2.2 or UL60601-1 2nd Edition Section 20.4 or IEC60601-1 3rd Edition Section 8.8.3 for more information).
By selecting this Excelsys product range customers can test in-situ with a DC voltage of 6kV applied across the isolation barrier of a fully assembled power supply.
Excelsys will continue to carry out 100 per cent production testing of all primary to secondary isolation barriers on all Xgen products. This will directly address the growing demand from customers to verify the isolation barrier on their application without causing an electrical stress on internal components.
The Excelsys Xgen series of medically approved power supplies can provide up to 1340W watts of output power with DC voltages in user selectable combinations from 1.5V to 58V each with individual output control. The series has leakage current of under 300µA, and the option of less than 150µA. All outputs are fully floating allowing series/parallel connection of all multiple outputs for non-standard voltages or higher output current. Xgen power supplies may be connected in parallel for higher system power requirements and a 5V bias standby voltage is provided on all models.
Sample products are available immediately and production quantities are available from May 2012.
For more information, visit www.excelsys.com