Film capacitors are renowned for their excellent properties, possessing high insulation resistance, exceptional frequency characteristics (wide frequency response), and low dielectric loss. Leveraging these advantages, film capacitors find extensive use in analog circuits, particularly for their filtering capabilities.
Filter film capacitors, specifically designed for energy storage at the terminals of rectifier circuits, play a crucial role in reducing the AC pulsation ripple coefficient and enhancing the smoothness of DC output. In circuits where alternating current needs conversion into direct current, the inclusion of filter film capacitors ensures the stability of electronic circuit performance and minimizes interference from alternating ripple.
However, instances of filter film capacitor failures may occur, and several factors contribute to these issues:
Product Quality: Issues related to the manufacturing process and materials can lead to filter film capacitor failures. This includes instances of unqualified manufacturing processes, discrepancies between marked and actual capacitance, and aging due to prolonged use, which can result in burnouts.
Environmental Influences: External environmental conditions also impact the performance of filter film capacitors. Poor heat dissipation, proximity to heat sources, suboptimal capacitor connections, and inadequate contact can contribute to burnouts.
Harmonic Problems: Harmonics can induce resonance in filter film capacitors, leading to overcurrent and subsequent burnouts. This harmonic-related issue poses a risk to the capacitor’s integrity.
Additionally, other unique factors may contribute to failures. Thorough analysis and investigation of the burned-out site are essential to determine the root cause of the failure. Often, even minor details can be significant contributors to burnouts, emphasizing the need for meticulous examination in troubleshooting these capacitor issues.
This article is provided by JYH HSU Electronics (JEC), a manufacturer of capacitors and resistors.
Post time: Dec-08-2023