Weidi Industrial will bring film capacitors to the 2013 High-tech LED Lighting Exhibition

[Text / high-tech LED reporter Liu Pingping] film capacitor is a metal foil as an electrode, and it is mixed with plastic film such as polyethylene, polypropylene, polystyrene or polycarbonate, and then wound into a circle. Capacitor in a cylindrical configuration. According to the type of plastic film, it is called polyethyl capacitor (also known as Mylar capacitor), polypropylene capacitor (also known as PP capacitor), polystyrene capacitor (also known as PS capacitor) and polycarbonate capacitor.

Compared with aluminum electrolytic capacitors, film capacitors have the advantages of good reliability, stable performance, and large capacity, and are more suitable for the harsh outdoor environment. Especially in the field of new energy vehicles, wind power, solar power, high-speed rail and light rail trains and high-voltage inverters, film capacitors have become the first choice due to their advantages in life, temperature and voltage.

Liu Jianxiong, general manager of Shenzhen Weidi Industrial Development Co., Ltd. (hereinafter referred to as “Weidi Industry”), said that the rise of LED lighting applications has opened up a new market for the application of film capacitors. “We are now using thin films for LED driver power supplies. Capacitor shipments can reach 100 million in a month." In order to better promote film capacitors, Weidi Industrial will bring its film capacitor products to the 2013 high-tech LED lighting exhibition.

Weidi Industrial Film Capacitor

Founded in 2002, Weidi Industrial specializes in the research, development, production and sales of film capacitors. The products are sold all over the country and exported to Europe, America, Middle East, East Asia and other countries and regions, becoming the leading professional manufacturer of film capacitors in the industry. Dealer.

Tao Wentao, technical director of Weidi Industrial Co., said that the film capacitors used in different types of driving power supplies are different. He gave an example of isolated switching power supplies.

It is well known that high-reliability, medium- and high-power LED driver circuits generally use isolated switching power supplies to improve their safety, energy efficiency and longevity. LED street lamps use this solution because of their high efficiency and high reliability requirements. It is more extensive. The circuit generally consists of an EMI filter loop, an active PFC loop, a high frequency resonant loop, and a constant current constant voltage drive loop.

“The EMI filter circuit needs to use X2 and Y2 film capacitors; PFC circuit needs to use PFC filter film capacitor. Because there is a large ripple current in this case, it is necessary to select DC filter film capacitor with high frequency characteristics; high frequency resonance The resonant capacitor selected in the loop must be a polypropylene film capacitor that is resistant to high frequency voltage and can withstand high frequency and high current."

Tao Wentao emphasized that a 50V~100V film capacitor is also used in the high-frequency drive circuit to assist the high-frequency filtering. The selected film capacitor must be a series of high-frequency loss-consistent film capacitors to reduce the failure rate. .

D-sub Connector Contacts
A D-sub connector is a form of connector commonly found in electronic and computer systems. It consists of a D shaped metal band and two or more parallel rows of either pin contacts (male) or socket contacts (female). D-sub connector contacts can vary in size, material, current rating, length and resistance.

The most common type of connector is the crimp contact. These are assembled by inserting a stripped wire end into the cavity at the rear of the contact. The cavity is then crushed using a crimp tool, gripping the contact to the wire.

What are D-sub connector contacts used for?
The D-sub connector contacts carry the signal from the source to the destination across the D–sub connection.

Types of D-sub connector contacts
Most D-sub connectors are supplied with contacts ready in place. Contacts can be replaced if damaged or if the application of the D-sub connector is to be changed from the original design specification.

High-current, high-voltage, or co-axial inserts require larger contacts. The material of the D-sub connector contact can be changed if the robustness or quality of the connection needs to be improved.

D-sub Connector Contacts

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