[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 Industryâ€), 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. Capacitance shipments can reach 100 million in a month." In order to better promote film capacitors, Weidi Industrial brought its products to the 2013 High-tech LED Lighting Exhibition on November 25-27.
Founded in 2002, Weidi Industrial specializes in the research, development, production and sales of film capacitors. Its 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. Business and distributors.
Tao Wentao, technical director of Weidi Industrial, said that the film capacitors used in different types of driving power sources 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 circuit must be a polypropylene film capacitor that can withstand high-frequency voltage and can withstand high-frequency and high-current. "Tao Wentao emphasized that a 50V~100V film capacitor can also be used in the high-frequency drive circuit to assist the high. For the purpose of frequency filtering, the selected film capacitor must be a series of film capacitors with high frequency loss uniformity to reduce the failure rate.
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 Industryâ€), 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. Capacitance shipments can reach 100 million in a month." In order to better promote film capacitors, Weidi Industrial brought its products to the 2013 High-tech LED Lighting Exhibition on November 25-27.
Founded in 2002, Weidi Industrial specializes in the research, development, production and sales of film capacitors. Its 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. Business and distributors.
Tao Wentao, technical director of Weidi Industrial, said that the film capacitors used in different types of driving power sources 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 circuit must be a polypropylene film capacitor that can withstand high-frequency voltage and can withstand high-frequency and high-current. "Tao Wentao emphasized that a 50V~100V film capacitor can also be used in the high-frequency drive circuit to assist the high. For the purpose of frequency filtering, the selected film capacitor must be a series of film capacitors with high frequency loss uniformity to reduce the failure rate.
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