In this paper, a new high temperature resistant metallized polypropylene film material is used as the medium and electrode, and the high temperature insulating epoxy resin potting material is used for encapsulation. The metallization with high temperature resistance (upper category temperature is 125 ° C) is designed by using a strict manufacturing process. The polypropylene film dielectric AC pulse capacitor expands the application range of polypropylene film capacitors.
1. Introduction
With the development and advancement of electronic science and technology, the energy problems in the 21st century have become more and more eye-catching. The global industry is experiencing a lot of energy-saving, and the lighting industry is part of it. According to incomplete statistics, the electricity consumption of lighting is very large. As a result, the potential for energy savings is enormous, which provides business opportunities and challenges for component suppliers in the lighting industry. The capacitor industry is one of the beneficiaries, especially in incandescent and inductive ballasts, with the rapid development of compact energy-saving lamps, electronic ballasts and fourth-generation or green-light LEDs. The development of long-life, high-power electronic products is a new development trend in the lighting industry.
This paper mainly discusses how to design a high temperature resistant polypropylene film AC pulse capacitor with a high dv/dt pulse climbing rate with a rated temperature of 105 °C and an operating temperature range of -55 °C to +125 °C.
2. Market research
This kind of products are mainly used in electronic ballasts and LEDs in the lighting market. The market demand is relatively large and the risk is small. The customer base mainly includes five global lighting manufacturers such as Philips. The typical application circuits are as follows:
2.1 Electronic ballast
Mainly divided into European circuits (as shown in Figure 1) and American circuits (shown in Figure 2).
a. European circuit: used in C6, C7, C9 position, C6, C7 buffering, C9 position resonance;
b. American circuit: used in C6, C7, C8 position, C6 pulse push, C7 resonance, C8 position to limit current;
2.2 LED energy-saving lamp circuit (shown in Figure 3) used in C6, C8, C9 position, C6, C9 for absorption, C8 for resonance.
3. Technical requirements
Climate type: 55/125/56
Rated temperature: 105 ° C
Category voltage: UC=0.75UR
Life (high temperature durability) experiment: 1.25UR, 105 ° C, 2000h;
Requirements (GB/T14579-93 (IEC 60384-17-1987):
△C/C≤5%, △tgδ10kHz≤0.0015.
dV/dt test:
Charging voltage (Vd.c.): UR; discharge resistance (Ω):
Rd=short circuit, charge and discharge times: 100,000 times 4. Product design and process control
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