PULSE CAPACITOR (PCCAD) UNIQUE SOFTWARE order make easy select pu

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PULSE CAPACITOR (PCCAD) UNIQUE SOFTWARE order make easy select pu

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PULSE CAPACITORS
PULSE CAPACITOR (PCCAD) UNIQUE SOFTWARE
order make easy select pulse capacitors Evox Rifa developed software Windowswith following main options: general technical information about pulse capacitors complete data sheets Evox Rifa pulse capacitors select Part Number then diagrams ESR, lrms Urms frequency ambient temperature. This means that easy check certain capacitor suitable certain application. make Fourier analysis arbitrary waveform. make print-outs data files diagrams from simulations. This normally information needed select right pulse capacitor. Just free copy download from website, back cover addresses.
Pulse capacitors intended coupling, bypass, filtering, snubbering pulse operation SMPS well high voltage high frequency where there need high pulse rise time high ionization level, e.g. fly-back circuits TVsets.
single metallized films
PHE426
double metallized films dielectric films
PHE427
double metallized film
CONSTRUCTION
metallized film capacitor electrodes deposited under vacuum plastic film. Contact metallized layers achieved spraying ends windings with special metal alloy. This method results inductance series resistance capacitor. There three main types metallized film compositions. film/foil types capacitors metal foils used electrodes.
single metallized polypropylene film polypropylene film metal foil electrodes polypropylene films single metallized polypropylene film metal foil electrodes polypropylene films
PHE428
PHE448
CQ92P
TERMS DEFINITIONS
Pulse capacitor pulse capacitor capacitor designed primarily applications with intermittent charges and/or discharges high values charge/discharge current. Rated capacitance (CR) rated capacitance capacitor value which indicated upon capacitance measured +23°C. Rated temperature rated temperature maximum ambient temperature which rated voltage continuously applicable. Rated voltage (UR) rated voltage maximum direct voltage maximum alternating voltage which applied continuously terminals capacitor temperature within rated temperature range. Climatic category climatic category states category temperature range humidity class. example 40/085/56 stands 40°C 85°C; states that steady state humidity test should take days (see under "Quality tests requirements"). Temperature derated voltage temperature between rated temperature upper category temperature, temperature derated voltage maximum voltage that applied continuously terminals capacitor.
0.47
0.01 1000
Dissipation factor frequency. Typical values Evox Rifa range.
PULSE CAPACITORS
TERMS DEFINITIONS
Pulse operation Capacitors subjected pulses with fast rise fall times (high dU/dt) will exposed high current pulses dU/dt). order overload internal connections current must limited. current limits specific type capacitor dependent upon: Amplitude form pulse Rated voltage capacitor Capacitance Geometrical configuration winding repeated pulse operation, self-heating, ambient temperature cooling load limit. Pulse current limits commonly expressed form maximum permitted dU/dt volts microsecond. figures stated type specifications refer unlimited number pulses charging discharging from rated voltage Self-healing break-through plastic film/foil capacitor leads permanent short circuit capacitor carbon bridge which built break-down channel high temperature rise carbon content dielectric. metallized capacitor withstand break-through without permanent short circuit because self-healing ability. metallized layer between 0.02 weak point dielectric, because transient, break-down occur. thin metal layer around weak point evaporated weak point isolated. capacitor self-healed thereby. Dielectric absorption Dielectric absorption (DA) describes dielectric material's properties "remember" applied voltage. method define capacitor charged hour rated voltage (UR) then discharged through resistor ohms seconds. discharge resistor must then disconnected recovery voltage measured minutes after disconnection. dielectric absorption defined (Ur/UR) measurement according MILC19978 paragraph 4.6.15. dielectric absorption less than 0.01% polypropylene (PP). Insulation resistance insulation resistance capacitor mostly given also time constant (s). insulation resistance ratio between applied voltage (DC) current flowing through terminals capacitor. decide lower limit insulation resistance, following conditions valid: current measured after voltage been applied, temperature 23°C less than 65%. applied voltage given rated voltage capacitor. following limits valid metallized polypropylene capacitors (MKP) unless otherwise stated under each detail specification: Between terminals 100000M 0.33 30000 0.33 Terminals case 100000
+100
Insulation resistance temperature
(VDC) Uiso (VDC)
1000
1500
2000
2500
Capacitance Typical values capacitance frequency temperature shown graphs below.
C/C%
Dissipation factor (tan) dissipation factor power loss capacitor divided reactive power capacitor sinusoidal voltage specified frequency temperature. dissipation factor given Typical graph shown below.
0.04 0.03
1MHz
0.02 0.01
Capacitance frequency 23°C)
C/C%
+100
Dissipation factor temperature kHz).
+100
Capacitance temperature kHz)
THERMAL DISSIPATION
power dissipation capacitor approximately: Urms2 tan/(2f Irms2 dissipation factor. Typical values estimated from diagram page 184. frequency (Hz) This valid sine wave signals. wide band signals, power dissipation values each frequency have added, i.e. Ptot Rthha Temperature increase between spot (Th) capacitor ambient (Ta). Rthha Thermal resistance (°C/W) between spot ambient. Maximum permissible spot temperature +105 maximum T=10 lower higher allowed. This implemented PCCAD software package page 184. diagrams derated voltage frequency pulse capacitors this catalogue calculated with Example: PHE428 2000 kHz, Urms VAC, 0.04%, Rthha °C/W With formula above: 0.07 then
PULSE CAPACITORS
QUALITY TESTS REQUIREMENTS
details valid types capacitors unless specific remark made each detail specification. tests made +23°C unless otherwise specified.
Test Voltage proof
IEC-Publication 60384-1 clause
Procedure after
Requirements capacitors must withstand voltage without breakdowns flashovers without decreased insulation resistance below value each detail specification. visible damage. above
clause
(min case) after with 0.75 amplitude m/s2 depending frequency 4000 bumps with 390m/s2 mounted
Vibration
60068-2-6 Test
visible damage. stated value 0.5% stated value Insulation resistance: 100000 0.33 30000 0.33 Immersion terminations into solder bath shall completed time exceeding terminations shall remain immersed specified depth then withdrawn. stated value visible damage. Insulation resistance: 100000 0.33 30000 0.33 stated value days visible damage. Insulation resistance: 50000 0.33 15000 0.33 stated value visible damage. stated value Insulation resistance: 100000 0.33 30000 0.33 (100 kHz) stated value (100 kHz) 0.5% Insulation resistance: 50000 0.33 15000 0.33
Bump
60068-2-29 Test
Resistance soldering heat
60068-2-20 Method
Solder bath 260°C with screening
Climatic sequence
60384-1 para 4:21
60068-2.2 heat 60068-2-34 damp heat, cycle, 60068-2-1 Test
Damp heat steady state
60068-2-3 Test
40°C
Endurance,
1000 +85°C 1.25
Charge discharge
60384-1 para 4.27
10000 pulses with x)dU/dt according detail specification
Note: Generally, small polypropylene capacitors sensitive soldering heat relatively melting point polypropylene material (160°C 170°C). This suitability soldering process should checked before especially PHE426 pitches. Consult Evox Rifa recommended temperature profiles.

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