Application of V-chip Type Capacitor

Application of V-chip Type Capacitor

General purpose, motherboard, display card, auto electronics

Application of Radial Type Capacitor

Application of Radial Type Capacitor

General purpose, Communication equipment,Industrial equipment,power supply, lighting and consumer electronics

Application of Screw Terminal Type Capacitor

Application of Screw Terminal Type Capacitor

General power input, output filter circuit, industrial machinery, communication equipment, power converter

Application of Snap-in Type Capacitor

Application of Snap-in Type Capacitor

General Power Input, Output Filter Circuit, Rectifier, Air Conditioner, Mechanical Equipment, Power Converter

Application Guidelines

 

 

1.Circuit Design

 

(1)Please make sure the application and mounting conditions to which the capacitor will be exposed are within the conditions specified in the catalog or alternate product specification [Referred as to specification here after}.

(2)Operating temperature and applied ripple current shall be within the specification.

①The capacitor shall not be used in an ambient temperature which exceeds the operating temperature specified in the specification.

②Do not apply excessive current which exceeds the allowable ripple current.

(3)Appropriate capacitors which comply with the life requirement of the products should be selected when designing the circuit.

(4)Aluminum electrolytic capacitors are polarized. Make sure that no reverse voltage or AC voltage is applied to the capacitors. Please use bi-polar capacitors for a circuit that can possibly see reversed polarity. Note: Even bi-polar capacitors can not be used for AC voltage application.

(5)For a circuit that repeats rapid charging/discharging of Electric, an appropriate capacitor that is capable of enduring such a condition must be used. Welding machines and photoflash are a few examples of products that contain such a circuit. In addition, rapid charging/discharging may be repeated in control circuit for servomotors, in which the circuit voltage fluctuates substantially. For appropriate choice of capacitors for circuit that repeat rapid charging/discharging, please consult us.

(6)It is said that to restrain output ripple current, the output smoothing capacitor of the switching power supply is suitable to use the smaller ESR capacitor. However when the low ESR capacitor is used, the phenomenon sometimes occurs that is called the abnormal oscillation of output voltage.

30 degrees t0 40 degrees or more of phase margin is thought as a necessity to inhibit the oscillation of output voltage with a general negative feed-back circuit. The Phase margin is numerical value how much the minimum value of the Phase is distant from-180 degrees. The smaller the Phase margin gets, the higher the possibility to oscillate by the character dispersion and temperature change of the component will be.

By doing Phase compensation with the feed-back circuit of the error amplifier the oscillation of output voltage can be inhibited.

(7)Make sure that no excess voltage (that is, higher than the rated voltage) is applied to the capacitor.

①Please pay attention so that the peak voltage, which is DC voltage overlapped by ripple current, will not exceed the rated voltage.

②In the case where more than 2 aluminum electrolytic capacitors are used in series, please make sure that applied voltage will be lower than rated voltage and the voltage be will applied to each capacitor equally using a balancing resistor in parallel with the capacitors.

(8)Outer sleeve of the capacitor is not guaranteed as an electrical insulator. Do not use a standard sleeve on a capacitor in applications that require the electrical insulation. When the application requires special insulation, please contact us for details.

(9)Capacitors may fail if they are used under the following conditions:

①Environmental (climatic) conditions

(a) Being exposed to water, high temperature & high humidity atmosphere, or condensation of moisture.

(b)Being exposed to oil or an atmosphere that is filled with particles of oil.

(c) Being exposed to salty water or an atmosphere that is filled with particles of salt.

(d) In on atmosphere filled with toxic gasses (such as hydrogen sulfide,sulfurous acid, nitrous acid, chlorine, bromine, methyl bromide,ammonia, etc.)

(e) Being exposed to direct sunlight, ozone, ultraviolet ray, or radiation.

(f) Being exposed to acidic or alkaline solutions

②Under severe conditions where vibration and/or mechanical shock exceed the applicable ranges of the specifications

(10)When designing a P.C. board, please pay attention to the following:

① Have the hole spacing on the P.C. board match the lead spacing of the capacitor.

② There should not be any circuit pattern or circuit wire above the capacitor pressure relief vent.

③ Unless otherwise specified, following clearance should be made above the pressure relief vent.

Case Diameter Clearance Required

φ6.3~16mm 2mm or more

φ18~35mm 3mm or more

φ40mm or more 5mm or more

④ In case the vent side is placed toward P.C. board (such as end seal vented parts), make a corresponding hole on the P.C. board to release the gas when vent is operated. The hole should be made to match the capacitor vent position.

⑤ Screw terminal capacitors must be installed with their end seal side facing up. When you install a screw terminal capacitor in a horizontal position, the positive terminal must be in the upper position.

(11)The main chemical solution of the electrolyte and the separator paper used in the capacitors are combustible. The electrolyte is conductive.When it comes in contact with the P.C. board, there is a possibility of pattern corrosion or short circuit between the circuit patterns which could result in smoking or catching fire.

Do not locate any circuit pattern beneath the capacitor end seal.

(12)Do not design a circuit board so that heat generating components are placed near an aluminum electrolytic capacitor or reverse side of P.C. board (under the capacitor).

(13)Electrical characteristics may vary depending on changes in tempera- ture and frequency. Please consider this variation when you design circuits.

(14)When you mount capacitors on the double-sided P.C. boards, do not place capacitors on circuit patterns or over on unused holes.

(15)The torque for terminal screw or brackets screws shall be within the specified value in specifications.

(16)When you install more than 2 capacitors in parallel, consider the balance of current flowing through the capacitors. Especially, When a solid conductive polymer aluminum electrolytic capacitor and a standard aluminum electrolytic capacitor are connected in parallel, special consideration must be given.

(17)If more than 2 aluminum electrolytic capacitors are used in series, make sure the applied voltage will be lower than the rated voltage and that voltage will be applied to each capacitor equally using a balancing resistor in parallel with each capacitor.

 

2. Mounting

(1)Once a capacitor has been assembled in the set and power applied, Even if a capacitor is discharged, an electric potential (recovery voltage) may exist between the terminals.

(2)Electric potential between positive and negative terminal may exist as a result of returned electromotive force, so please discharge the capacitor using a l k resistor.

(3)Leakage current of the parts that have been stored for more thanl year may increase. If leakage current has increased, please perform a voltage treatment using 1 k resistor.

(4)Please confirm ratings before installing capacitors on the P.C. board.

(5)Please confirm polarity before installing capacitors on the P.C. board.

(6)Do not drop capacitors on the floor, nor use a capacitor that was dropped.

(7)Do not damage the capacitor while installing.

(8)Please confirm that the lead spacing of the capacitor matches the hole spacing of the P.C. board prior to installation.

(9)Snap-in type capacitor should be installed tightly to the P.C. board (allow no gap between the P.C. board and bottom of the capacitor.

(10)Please pay attention that the clinch force is not too strong when capacitors are placed and fixed by an automatic insertion machine.

(11)Please pay attention to that the mechanical shock to the capacitor by suction nozzle of the automatic insertion machine or automatic mounter, or by product checker, or by centering mechanism.

(12)Hand soldering.

①Soldering condition shall be confirmed to be within the specification.

②If it is necessary that the leads must be formed due to a mismatch of the lead space to hole space on the board. bend the lead prior to soldering without applying too much stress to the capacitor.

③If you need to remove parts which were soldered, please melt the solder enough so that stress is not applied to lead.

④Please pay attention so that solder iron does not touch any portion of capacitor body.

(13)Flow soldering (Wave solder)

①Aluminum capacitor body must not be submerged into the solder bath. Aluminum capacitors must be mounted on the "Top side" of the P.C. board and only allow the bottom side of the P.C. board to come in contact with the solder.

②Soldering condition must be confirmed to be within specification. Solder temperature: 260+5℃, Immersing lead time:10+1 second,Thickness of P.C. board : 1.6mm.

③Please avoid having flux adhere to any portion except theterminal.

④Please avoid contact between other components and the aluminum capacitor.

(14)Reflow soldering (SMD only)

①Soldering condition must be confirmed to be within specification. Pre-heating: Less than 150℃, 90 seconds max. Max. temperature of capacitor top during reflow : 230℃ The duration for over 200℃ temperature at capacitor top: 20 seconds max. The duration from the pre-heat temperature to peak temperature of reflow varies due to changes of the peak temperature.

②When on infrared heater is used, please pay attention to the extent of heating since the absorption rate of infrared, will vary due to difference in the color of the capacitor body,material of the sleeve and capacitor size.

③The number of reflow time for SMT aluminum electrolytic capacitors shall be one time. If this type of capacitor has to be inevitably subjected to the reflow twice, enough cooling time between the first and second reflow (at least more than 30 minutes) shall be taken to avoid consecutive reflow. Please contact us if you have questions.

(15)Soldering flux There ore non-halogen types of flux that do not contain ionic halides, but contain many non ionic halides. When these non-ion-ic halides infiltrate the capacitor, they cause a chemical reaction .that is just as harmful as the use of cleaning agents. Use soldering flux that does not contain non-ionic halides.

(16)Do not tilt lay down or twist the capacitor body after the capacitors are soldered to the P.C. board.

(17)Do not carry the P.C. board by grasping the soldered capacitor.

(18)Please do not allow anything to touch the capacitor after soldering. If P.C. boards are stored in a stack, please make sure P.C. board or the other components do not touch the capacitor.The capacitors shall not be affected by any radiated heat from the soldered P.C. board or other components after soldering.

 

3.ln the equipment

(1)Do not directly touch terminal by hand

(2)Do not short between terminals with conductor, nor spill conductible liquid such as alkaline or acidic solution on or near the capacitor.

(3)Please make sure that the ambient conditions where the set is installed will be free from spilling water or oil, direct sunlight,ultraviolet rays, radiation, poisonous gases, vibration or mechanical shock.

4. Maintenance Inspection

Please periodically inspect the aluminum capacitors thatare installed in industrial equipment. The following items should be checked:

① Appearance: Remarkable abnormality such as vent operation, leaking electrolyte etc.

② Electrical characteristic: Capacitance, dielectric loss tangent. leakage current, and items specified in the specification.

5.ln an Emergency

(1)If you see smoke due to operation of safety vent, turn oft the main switch or pull out the plug from the outlet.

(2)Do not bring your face near the capacitor when the pressure relief vent operates. The gasses emitted from that are over 100℃.

If the gas gets into your eyes, please flush your eyes immediately in pure water.

If you breathe the gas, immediately wash out your mouth and throat with water.

Do not ingest electrolyte. If your skin is exposed to electrolyte,please wash it away using soap and water.

 

6.Storage

(1)It is recommended to keep capacitors between the ambient temperatures of 50℃ t0 35℃ and a relative humidity of 75<70 0r below.

(2)Leakage current of the parts that have been stored for more than 1 year may increase .If leakage current has increased please perform a voltage treatment using 1 k resistor.

(3)Confirm that the environment does not have any of the following conditions:

①Where capacitors are exposed to water, high temperature & high humidity atmosphere, or condensation of moisture.

②Where capacitors are exposed to oil or an atmosphere that is filled with particles of oil.

③Where capacitors are exposed to salty water, high temperature & high humidity atmosphere, or condensation of moisture.

④The atmosphere is filled with toxic acid gasses (e.g. hydrogen sulfide. sulfurous acid, nitrous acid, chlorine, bromine, methy bromide, etc.)

⑤ The atmosphere is filled with toxic alkaline gasses (e.g. ammonia)

⑥Where capacitors are exposed to acidic or alkaline solutions.

 

7. Disposal

Take either of the following methods in disposing of capacitors.

Make a hole in the capacitor body or crush capacitors and incinerate them. If incineration is not applicable, hand them over to a waste disposal agent and have them buried in a landfill.

 

●Explosion-proof and fire retardant products

 

8. Introduction of explosion-proof and fire retardant products

Add a fire retardant structure In Φ16 ~ Φ 50 high voltage aluminum electrolytic capacitors, and using fire-retardant electrolyte , can better solve the problem of high product creasing fire or explosion . And it cause less damage to the circuit . The product will not burn to make core ejection and combustion. Our company obtains the relative patent in November 17, 2010

 

9 .Application of explosion-proof and fire-retardant products

High voltage aluminum electrolytic capacitor in working if internal core explosion creating sparks, and the core spray to the outside of the case, can cause body injury or damage other electronic components even causing a fire,. The explosion-proof and flame retardant products can solve these relative problems. It can avoid the worries of the extreme conditions due to capacitor burning, caused by the accident.

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