Fusion d'Exxelia Microspire et Exxelia N'Ergy
Exxelia annonce la fusion de ses deux sociétés Exxelia Microspire et Exxelia N’Ergy. Les deux entités sont désormais rassemblées sous un même nom : Exxelia Magnetics.
Exxelia Magnetics regroupe toutes les activités de conception, fabrication et industrialisation de composants magnétiques bobinés, du groupe en France : transformateurs et inductances, électroaimants, rotors et stators.
Cette fusion vise à améliorer les services réalisés auprès des clients et autres collaborateurs mais également à simplifier les démarches administratives et commerciales. L’organisation actuelle des entreprises, les sites et leurs fonctions allouées restent inchangés.
Exxelia Microspire conçoit, industrialise et fabrique depuis plus de 35 ans des composants bobinés : transformateurs et inductances, électroaimants, rotors et stators.
Exxelia Microspire dispose de plusieurs sites de fabrication dont notamment des sites à faibles coûts de production nouvellement installés, permettant de proposer des solutions compétitives.
Le savoir-faire d’Exxelia Microspire inclut les technologies standards de bobinage linéaire (formats RM, ETD, EP, EFD, ER, EQ..) et toroïdal. Pour les marchés à environnements sévères (chocs, vibration, hautes températures, …). Exxelia Microspire dispose de technologies spécifiques et innovantes telles que les technologies SESI, TT et CCM.
La qualification de ses technologies, la définition des règles de conception associées et son organisation industrielle lui permettent de proposer à ses clients des solutions optimales.
Exxelia N’Ergy est spécialisée dans la conception, la fabrication de composants électromagnétiques passifs spécifiques, en petite et moyenne série.
Exxelia N’Ergy propose :
- l’étude et la conception de composants électromagnétiques spécifiques avec conducteurs cuivre ou aluminium destinés aux domaines de la conversion d’énergie de produits embarqués,
- la fabrication de bobinages linéaires ou toriques en petite et moyenne série en fourniture complète ou partielle,
- le surmoulage de composants électromagnétiques ou de cartes (potting),
- le contrôle électrique 50 ou 400 Hz.
What you should know about electrolytic aluminum capacitors ?
1. Basic construction Structure of an electrolytic aluminum capacitor is shown hereunder: Anode: aluminum foil Dielectric: aluminum oxide Papers spacers impregnated with electrolyte Ionic conduction assumed by electrolyte Cathode: aluminum foil The positive plate is an etched aluminum foil covered with alumina which is the dielectric of the capacitor. The negative plate is constituted by a second aluminum foil which serves as a current supply, and by electrolyte-impregnated papers layers. The metal used for anode is a ≥ 99,98 % grade aluminum. The dielectric has a thickness of 13 Å / V. The aluminum used for the cathode is a ≥ 98 % grade aluminum covered with a dielectric layer with a thickness of about 40 Å. > See our capacitors in catalog 2. Diagram of the equivalent circuit CA = Capacitance of the anode CK = Capacitance of the cathode Rp = Parallel resistance due to the aluminum oxide f Ilms. RL = Series resistance of connections, plates and impregnated spacer. Ls = Inductance of winding and connections. A standard simplified diagram is : Cs is the series capacitance of both anode and cathode capacitances. Electrolytic aluminum capacitors are naturally polarized because of the insulating f Ilm on the anode. Given the very thin aluminum oxide layer, a reversed voltage should not exceed 1.5 V when there is energy supply. Short duration reverse voltages can be absorbed by special construction, second anode replacing the former cathode. 3. Electrical characteristics ✪ Rated capacitance Cr The rated capacitance is defined at 100 Hz and at ambient temperature. ✪ Rated voltage Ur Ur is the maximum DC voltage which may be applied in continuous operation. When applying a superimposed alternating voltage, the peak value of the resulting waveform should not exceed the rated voltage. ✪ Peak voltage Up Up is the maximum repetitive voltage which can be applied within short periods. Defined in CECC 30 300 and IEC 60 384-4: 1000 cycles of 30 s charge followed by a no load period of 5 min. 30 s with upper category temperature. Up ≤ 1,15 UR (UR ≤ 315 V) Up ≤ 1,10 UR (UR > 315 V) ✪ Dissipation factor Tan The dissipation or loss factor is defined by its tangent Tand ✪ Equivalent series resistance ESR The relation between ESR and dissipation factor Tand. ✪ Impedance Z - Inductance L The impedance is given by: Z =g R2 + (Lv –1 )2 Cv L inductance. Generally L = 5 to 20 nH Z and ESR as function of frequency typically follows the chart: ✪ Permissible ripple current (I r.m.s.) The current is defined at the maximum climatic category and at 100 Hz. It is the root mean square value r.m.s. The value I0 is the rated value for calculations of expected life up to3 I0. ✪ Leakage current Il Il is measured at 20°C after a 5 min. polarization under rated voltage. For CR in μF and UR in V: Il ≤ 0,01 CR UR or 1 μA* when CR UR ≤ 1000 μC Il ≤ 0,006 CR UR + 4 μA when CR UR > 1000 μC For UR > 350 VDC it can be specified: with K = 4, 6 or 8 or Il ≤ 0,3 (CR UR)0,7 + 4 μA (CECC 30 300) * Whichever is the greater ✪ Characteristics Versus temperature (typical values). - Capacitance drift Versus temperature - ESR and Z drifts at 100 Hz Versus temperature - Leakage current drift Versus temperature > See our capacitors in catalog 4. Specification to apply Electrolytic aluminum capacitors are defined in: NF and UTE French national standard CECC European specifications IEC international specifications Quality insurance procedures are described in these specifications. 5. Endurance tests / life time ✪ Standard endurance test at max category temperature: Standard endurance tests do not exceed 2000 hours at 125°C. However, present EXXELIA technologies concerning liquid electrolytes have led to endurance tests up to 5000 hours at 125°C (PRORELSIC 125 - FELSIC 125 RS) and even 20000 hours at 125°C (PRORELSIC 145 - ALSIC 145). ✪ Performance requirements on standard endurance tests Permissible capacitance drift ∆C/C (%) Permissible increase factors on Tand, ESR, Z and Il initial values (1) Tand or ESR: for initial value, take standard value. (2) Z: for initial value, take specified value (see data sheet ). Specific requirements can be taken into consideration with regards to initial values of dissipation factor or equivalent series resistance and impedance. ✪ Failure criteria for electrolytic capacitors Failure criteria are defined in CECC 30 301 Non measurable defaults leading to complete failure. Measurable defaults leading to adjustment losses of the load circuit (failure due to variations). - Non measurable defaults They might be summed up as: Open circuit Short circuit Operation of pressure relief device Severely damaged insulation Unusable terminations - Measurable defaults Variations exceeding the values given below characterize a default. Capacitance drift ∆C/C (%): 3 times the limit for standard endurance testing or 50 % (whichever is the smallest). Tand or ESR: 3 times standard max initial values. Z: 3 times standard max initial values. Il: initial limit (under load conditions). Specific requirements can be taken into consideration with regards to lower drifts. Influence of main parameter on operational life. - Temperature The capacitors operational life is highly dependent upon its internal temperature Ui and therefore upon the ambient temperature and the ripple current. Knowing ESR and dissipated power values one can figure out, the internal temperature rise and then determine the capacitors expected life. With present high boiling point electrolytes Ui max = 125 to 185°C depending on styles. - Ripple current The ripple current flowing through the capacitor increase the internal temperature through power dissipation. Standards define the permissible current at 100 Hz and generally consider a temperature rise of 5 to 10°C of max category temperature. Current waveforms and frequencies make it difficult to clearly determine the capacitors internal temperature rise, which defines the operationally life. Experiments confirm following relationship: Ui = Ua + (Uc - Ua) K Where: Ui = Internal hot spot temperature Ua = Ambient temperature Uc = Case temperature K = Parameter depending upon case diameter and cooling Ø ≥ 51 k = 2 ± 0,5 Ø < 51 k = 1,5 ± 0,5 (air cooling - 0,2 m/s) r.m.s. value according to current waveform. - Dissipated power versus case dimension For calculations of ripple currents, considering an internal temperature rise of 10°C P = ESR.I ² P = Dissipated power (mW) (Ui - Ua = 10°C) ESR: Equivalent series resistance (100 Hz 20°C) I: Ripple current (r.m.s. value at 100 Hz) For different frequencies from 100 Hz, I must be multiplied by the factor F, according to above chart. - Thermal resistance Rth and air cooling Rth is static thermal resistance (without cooling) between capacitor central hot spot and ambient temperature measured at a distance of one capacitor diameter Forced or not cooling air can lead to a significant decrease of these values. Consequently, r.m.s. ripple current can be increased as a function of air cooling speed: This parameter shall be applied to one capacitor alone. For capacitors in bank, ambient temperature must be strictly equal around all capacitors. - Quality guaranty We guarantee products manufactured during 2 years from the data of shipment against defaults of material and assembly. This guaranty can be involved by the buyer only if our products are used within normal conditions, always according to the state of the art and taking in account storage conditions. The equipment design should take into consideration possible failures of our capacitors and related effects in order to avoid them. Guaranty is not applicable for damages occurred by surge voltage, irregular use, polarity inversion or maintenance default. Guaranty is exclusively limited to the replacement of individual defective capacitors within the terms of delivery. This rule applied to all cases and particularly to any further consequence of failures. - Reliability Failure rate: FR = Number of components tested x test duration / Number of failures Failure rate is measured in FIT (failure in time = 10–9 / hour). The failure rate is set up during the life time of the capacitor (phase II) I. Early failure phase (generally excluded during ageing process). II. Operational life time of the capacitors III. End of life Mean time between failures MTBF = 1/FR mesured in years Multiplying factor of FR with voltage and temperature > See our capacitors in catalog 6. Information on application ✪ Cleaning solvents Use aliphatic alcohols, such as denatured ethyl alcohol, isopropanol, or butylacetate, or else alkaline d Iluted solutions. Avoid incompatible solvents (halogenous for example). ✪ Shelf life There is no electrical characteristics variation for long periods of storage except leakage current which can increase. It is caused by chemical reactions between the dielectric alumina and the electrolyte. These reactions are reversible when switched on. Capacitors can generally be stored at temperature between –5° and +50°C without reforming for the following periods of time: For UR ≤ 100 V, storage time: 5 years (up to 10 years under specific conditions) For 100 V < UR ≤ 360 V storage time: 3 years For 360 V < UR < 500 V storage time: 1 year For UR ≤ 500 V, storage time: 6 months Generally when these periods are overstepped, one hour at rated voltage causes the decrease of leakage current under the specified limits. An other way to avoid this leakage current increase problem is to always limit ava Ilable power through capacitor during first seconds or minutes after storage or transport, according to the following chart: ✪ Low pressure resistance EXXELIA capacitors can be used with ambient low pressure decreasing up to 10 mbar (altitude 28000 m – 92000 feet). ✪ Mounting screw terminals capacitors (FELSIC) Capacitors may be used vertically (terminals on top) or horizontally. When used horizontally, the following position in relation to the safety vent, is recommended: Mounting capacitors in series may be used for operating voltage exceeding Ur. See FELSIC in bank. ✪ Mounting solder type capacitors They may be used in any position. During mounting, avoid applying excessive force to capacitor pins or wires. There is a risk of damaging internal connections. After soldering and for the same reasons, do not try to move the capacitor's body. ✪ Electrolytes: safety rules Electrolytes used in EXXELIA capacitors are manufactured by EXXELIA. Main solvents are generally g butyrolactone and ethylene glycol, very stable high boiling point solvents. Ionic conductive salts in electrolyte induce a very weak acidity (pH 5 to 7). ✪ Environment In aluminium capacitors with liquid electrolyte there is no component showing a pollution risk, in small amounts, of air or water. EXXELIA is always involved in this security field particularly in using chemicals for electrolyte, without well-known risks. Dimethylformamide (DMF) dangerous solvent forbidden in several uses is completely excluded by EXXELIA,since 1990. There is no halogen compound such as chlorofluorocarbon (CFC or FCKW in german) or polychlorobiphenyl (PCBPyralene) or pentabromodiphenylether or octabromodiphenylether. There is neither benzene, toluene or phenyl compound nor explosive such as picric acid, nor asbestos in plastic covers. All the capacitors made by EXXELIA since 1991, can be scrapped or used in raw materials recycling processes without special care in compliance with Community rules. EXXELIA aluminium capacitors with non-solid electrolyte are particularly suitable for different kinds of environment taking in account severity increasing laws. European directives 2003/11/EC, 2002/96/EC (WEEE) and 2002/95/EC (RoHS) applies to all EXXELIA capacitors including every solder type, manufactured with pure tin coated pins or wires, since at least January 2006. > See our capacitors in catalog
MIL Spec 39006, Now available in LEVEL R
Exxelia, global manufacturer of complex passive components and subsystems for harsh environments, is expanding its line of MIL-PRF-39006/22 & MIL-PRF-39006/25 tantalum capacitors, with the support of the reliability level R. MIL-PRF-39006 tantalum capacitors equivalent to CLR79 and CLR81 series: this is the new range of gelled tantalum capacitors meeting the standards required by the US Department of Defense in the manufacturing of components (compatibility & reliability). Exxelia now offers reliability level R, in addition to level M and P for voltage ranges from 6 V to 125 V with capacitance values ranging from 1.7 µF to 1 200 µF. Available in all package sizes (T1 to T4), these fully sealed products are designed to operate at temperatures ranging from -55°C to +125°C and withstand the harshest environmental conditions. Performance highlights over solid tantalum capacitors include higher energy density, higher ripple currents, lower ESR and lower DC leakage current. Engineers with complex design requirements looking for a product that can be easily integrated into projects such as power supplies & converters or filtering units for the aerospace and defense industries will be pleased. MIL 39006/22 & MIL 39006/25 Level R are now available for order with a lead time of 14 weeks. "The introduction of these new ranges builds on our decades of experience in supplying high reliability capacitors to the military market and demonstrates Exxelia's ability to meet the most demanding specifications in terms of product development" says Jerome Tabourel, Exxelia's vice president of sales and marketing. "We are proud to be one of the few MIL qualified tantalum capacitor manufacturers, and our flexibility and advantageous lead times will bring new supply opportunities." TECHNICAL CHARACTERISTICS Capacitance from 1.7 μF to 1,200 μF Voltage from 6 V to 125 V Operating temperature -55°C to +125°C Very good shock and vibration resistance (option H available) Download the complete datasheet