EFOLIT® - Taped Reinforced Insulated High Frequency Litz Wires

General

The EFOLIT product family represents a triple insulated taped litz wire design with VDE-certification for reinforced insulation, which is necessary to certify products for high voltage applications. Litz wire diameters up to about 5.0 mm with temperature class 1) F/155°C and H/180°C cover a wide range of operating temperatures for various power applications.

According to specification:

DIN EN 61558, annex K
DIN EN 62368, annex J
DIN EN 60601, annex L

1) temperature class on basis of Heat-Shock Test

Features and benefits of EFOLIT® - litz wires

VDE-certified and tripple insulated EFOLIT-litz wires with self adhesive sPET, sPEN and sPI tape material allow very high break down voltages as well as high copper filling factor and flexibility 2). The requested long term high working voltage resistivity requires a very precise taping process assuring very small tolerances within one spool, one lot and different shipments. EFOLIT®-winding wires are optimized for high safety demands of coil constructions without or with reduced intermediate tape insulation, usually used for transformer designs aiming at simplified winding processes and reduction of dimension, weight and material.

2) customised designs with UL-approval on demand

Technical properties of EFOLIT® - litz wires

Operating range

Winding wires for reinforced insulation
Max. rated and peak voltage 1000 Vrms
1414 Vpeak
Max. frequency 500 kHz
Temperature class 1) F / 155 °C
H / 180 °C

Technical data of taping material

Self-adhesive tape sPET sPEN sPI
Description Polyester Polyethylene Naphtalate Polyimide
Permittivity (JIS C 2318) 3.2 2.9  
Tape - UL file no. 3) E 515235 E 515235 E 515235
Processing fusible fusible mechanical stripping

3) under reserve of changes and usage of optional materials

Product identification (coding)

Validated standards Code Temperature class Tape material
DIN EN IEC 61558, 62368, 60601
VDE-Reg. no. E078
(nom. test voltage: 5.5 kV)		 EFOLIT 11F class F - 155°C / 311°F sPET
EFOLIT 31F class F - 155°C / 311°F sPI
EFOLIT 22H class H - 180°C / 356°F sPEN
EFOLIT 32H class H - 180°C / 356°F sPI
DIN EN IEC 62368
VDE-Reg. no. E450 4)
(nom. test voltage: 3.0 kV)		 EFOLIT 13F class F - 155°C / 311°F sPET
EFOLIT 33F class F - 155°C / 311°F sPI
EFOLIT 24H class H - 180°C / 356°F sPEN
EFOLIT 34H class H - 180°C / 356°F sPI

4) also certified as basic insulation acc. DIN EN IEC 61558, annex K

Dimensional range

Winding wires for reinforced insulation
Diameter single conductor 0.020 - 0.300 mm
52 - 28 AWG
Outer diameter litz wire (approx.) 1.500 - 5.000 mm
21 - 7.5 AWG
Total copper cross section 0.41 - 9.42 mm2
Tape insulation (min.) 3 layers

Applications

  • Electric Vehicles (EV)
  • On-Board Charger (OBC)
  • DC/DC converter
  • Wireless charging (WPC)
  • Charging piles
  • Switch Mode Power Supplies (SMPS)
  • HF transformers
  • HF transducers
  • HF chokes