jbcapacitors blog

Our jb capacitors company exhibit in 2010 ElectronicsAsia HK show, many customers visited our green booth , our three sales girls who were wearing green jackets , stand in the green booth and welcome all the customers all over the world.

During the meeting, we display below our strong series samples, green bags, green leaflets and sample kits to customers , and they check our quality and send us their inquires. All of us enjoy the wonderful moment in the HK fair.

• JFA--Mylar polyester film capacitor
• JFB--Metallized polyester film capacitor
• JFD--Box metallized polyester film capacitors
• JFG--Axial polyester&polypropylene film capacitors
• JFL--Metallized polypropylene film capacitor
• JFO--X2 metallized polypropylene film capacitor
• JFN--X2 Metallized polypropylene film capacitors
• JFP--High voltage metallized polypropylene film capacitor
• JFX--Preminum metallized polypropylene film capacitors, for high-end audio products
• JCS,JCK--Standard SMD Aluminum Electrolytic capacitors
• Snap in terminals, Screw terminals and lug terminals for photo flash Aluminum Electrolytic capacitors

Our jb capacitors company sincerely hope to work with all the customers in the world. And we will exhibit in HK fair every year, welcome you visit our booth in 2011.

Next month on November 9th~12th, JB capacitors company will exhibit Electronica 2010 in Munich, Germany. Welcome to visit our booth No. B6.437/10

Polyester film capacitors:
K73-11, K73-15A, K73-16, K73-16V, K73-17, K73-17V, K73-21, K73-21B, K73-21G, K73-24, K73-24B, K73-5, K73-9, K73-9B, K73P-2, K73P-3, K73P-4, K76P-1,

Polypropylene capacitors:
K78-2

Polystyrene film capacitors:
K71-4, K71-5, K71-7V, PM1-1

Large Can Electrolytic capacitors:
K50-17, K50-37, K50-74, K50-80, K50-84, K50-86

From: Tony Szullo

To: JB

Attn.: Sophia

Dear Sophia,

Here is our statement about the X2 capacitors:

We are testing all incoming batch of X2 polypropylene capacitors for breakdown voltage. According to our internal quality standard, this must be minimum 2000Vdc. The shipment which we received from JB Capacitors is consistently well above this threshold on all purchased values from 0.022uF to 1uF. According to our QA reports, we have not experienced a single failure in the past 12 months period.

Best Regards,

Tony Szullo

Aluminum electrolytic capacitors may cause an explosion, fire, or other serious trouble if not used under specified operating conditions. Please familiarize yourself with the instructions given below before using these capacitors Operating temperature and ripple current.

• 1. Keep the operating temperature and ripple current in specified ranges. Applying an excessive current to a capacitor will overheat it, resulting perhaps in short-circuit, ignition, or other fatal fault.
• 2. A capacitor is also a heating component itself. Please be on guard, remembering that it heats up the inside of the equipment. Run the unit under normal conditions and check the temperature of the surroundings of the capacitor.
• 3. The permissible ripple current tends to decline with a rise in the atmosphere temperature (the temperature of the surroundings of the capacitor). Consider a permissible ripple current at the maximum predictable atmospheric temperature. Allow also for the changes in frequency.

Applied voltage and connections

• 1. Capacitors have polarity. Applying a reverse voltage or AC voltage to a capacitor may cause a fire or other fatal fault.
• 2. Use a bipolar capacitor for circuits whose polarity reverses. However, in this case, like any other case,refrain from using such a capacitor in AC circuit.
• 3. When an AC component is superimposed on a DC voltage, prevent the peak value from exceeding the rated voltage. An excessive voltage may cause a short-circuit, fire, or other fatal fault.
• 4. When connecting more than one capacitor in parallel, consider the resistance of the wiring. Establish the connections so that the wiring resistance will be equal at every capacitor.
• 5. When more than one capacitor is connected in series, all capacitors must be of identical ratings. Then connect the balancing resistors in parallel. At that time, design the circuit so that the voltage levels applied to all capacitors become equal.Check that the voltages applied to capacitors do not exceed a rated voltage.
• 6. Do not use such a capacitor for a circuit that is repeatedly charged and discharged quickly. If you are to use such a capacitor for a welding unit or for other charging and discharging purposes, use a capacitor designed on a separate basis.
• 7. Even slow recharging may shorten the service life of a capacitor if its voltage changes greatly. Check it sufficiently as installed on a larger machine or consult Capsun.

Capacitor insulation

• 1. Do not connect the blank terminal (reinforcing terminal) of a multi-terminal (three- or four-terminal) product of the snap-in type to another circuit. It may cause a short circuit.
• 2. The external sleeve of the snap-in type has no insulator. If you need a sleeve with an insulator, consult Capsun.
• 3. Ensure a completely open circuit between the case and the cathode terminal, and between the anode terminal and circuit pattern

Operating conditions

• 1. A splash of water, salty water, oil or other electrically conductive liquid on a capacitor or using a capacitor when it has dew on it may cause a breakdown. Oil on the rubber sealing or safety vent may cause a decline in airtightness. Do not use a capacitor with liquid on it.
• 2. Do not use or leave a capacitor in a place where there is a hydrogen sulfide, nitrous acid, sulfurous acid, chlorine, bromine, or other halide compound gas, ammonia, or other hazardous gas. The ingress of any of the aforementioned gases into a capacitor may corrode it. Avoid fumigating and spraying an insecticide as well.
• 3. Do not use or leave a capacitor in a place exposed to ozone, ultraviolet ray, or radiation.
• 4. Do not use a capacitor in a place where vibration or impact is excessive.

Installa tion Before installaton

• 1. Do not reverse the polarity. Do not use a capacitor to which a reverse voltage is applied, even if it looks problem-free. It must be greatly damaged.
• 2. Do not tighten the curled part (case sealed part) with a mounting fitting or otherwise stress it. Any such practice may cause a liquid leak or sleeve breakage.
• 3. Dropping or otherwise impacting a capacitor may result in a decline in its electric performance,causing a breakdown. Therefore do not cause an impact on it.
• 4. Do not reuse a capacitor which has been installed on a machine and energized. No capacitor can be reused except for those removed to measure their electric performance for a periodic checkup.

Method of installation

• 1. Do not make the safety vent (cap side) of a screw terminal type face downwards. The safety vent may let the electrolyte or compound leak.
• 2. Do not install a wiring or circuit pattern near the safety vent. When the safety vent is activated, the electrolyte may jet out, resulting in a fire or other secondary accident.
• 3. Avoid installing a heating part around a capacitor or in back of a printed wiring board (beneath the capacitor).
• 4. Do not hamper the activation of the safety vent. Above the safety vent (where a screw terminal type is installed on the terminal side, or snap-in type on the case bottom), allow for the following clearances.

jb capacitors produce MKT, MKP, X2 safety metallized polypropylene capacitors since 1980.

We are going to stock some X2 capacitors, and provide better delivery support to you. Do you have interest ?

Could you please send us the X2 capacitors requirements ? Then we will keep stock for you. You are welcome to request samples and quotation from us too.

Datasheet link : http://www.jbcapacitors.com/pdf/JFO-X2-Metallized-Polypropylene-Film-Capacitor-(4-approvals).pdf

I need below information, please help reply me:

• 1) Description or Part number of X2 film capacitors (can give Arcotronics, Epcos, Panasonic....X2 capacitors part number)
• 2) Quantity per shipment, per month or per year.
• 3) Order frequency
  

jb compañía condensadores producir  condensadores X2 película con UL, aprobaciones VDE. ampliamente utilizado en la central de medida,
el poder de proveedores y aplicación de la luz.
 
JFN--condensador de película de polipropileno metalizado
Hoja de datos: http://www.jbcapacitors.com/pdf/JFN-X2-Metallized-Polypropylene-Film-Capacitor-8-approvals.pdf
Cruz Arcotronics R46, Epcos B81130, Vishay MKP3382, Wima MP3, Panasonic ECQU.
corto plazo de tiempo: unos 6 ~7 semanas

电容降压的工作原理并不复杂。他的工作原理是利用电容在一定的交流信号频率下产生的容抗来限制最大工作电流。

例如，在50Hz的工频条件下，一个1uF的电容所产生的容抗约为3180欧姆。当220V的交流电压加在电容器的两端，则流过电容的最大电流约为70mA。虽然流过电容的电流有70mA，但在电容器上并不产生功耗，因为如果电容是一个理想电容，则流过电容的电流为虚部电流，它所作的功为无功功率。

根据这个特点，我们如果在一个1uF的电容器上再串联一个阻性元件，则阻性元件两端所得到的电压和它所产生的功耗完全取决于这个阻性元件的特性。例如，我们将一个110V/8W的灯泡与一个1uF的电容串联，在接到220V/50Hz的交流电压上，灯泡被点亮，发出正常的亮度而不会被烧毁。因为110V/8W的灯泡所需的电流为8W/110V=72mA，它与1uF电容所产生的限流特性相吻合。同理，我们也可以将5W/65V的灯泡与1uF电容串联接到220V/50Hz的交流电上，灯泡同样会被点亮，而不会被烧毁。因为5W/65V的灯泡的工作电流也约为70mA。

因此，电容降压实际上是利用容抗限流。而电容器实际上起到一个限制电流和动态分配电容器和负载两端电压的角色。

采用电容降压时应注意以下几点：

• 1.根据负载的电流大小和交流电的工作频率选取适当的电容，而不是依据负载的电压和功率。
• 2.限流电容必须采用无极性电容，绝对不能采用电解电容。而且电容的耐压须在400V以上。最理想的电容为铁壳油浸电容。
• 3.电容降压不能用于大功率条件，因为不安全。
• 4.电容降压不适合动态负载条件。
• 5.同样，电容降压不适合容性和感性负载。
• 6.当需要直流工作时，尽量采用半波整流。不建议采用桥式整流。而且要满足恒定负载的条件。

以上是电容降压工作原理的简单介绍。其实电阻、电容和电感作为电子电路的基本元件，熟知它们的特性并灵活地应用它们是非常重要的。