170123J630EB

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Film Capacitors

A film capacitor, also known as a plastic film capacitor, or polyester capacitor, is an electrical part made up of a thin plastic film, metal foil layers, and electrodes. It is usually used as a medium-to-high capacitance, very high insulation resistance, and low self-inductance component in automotive and consumer electronics products.

The 170123J630EB film capacitor is specifically designed for power supplies and clamp circuits. This capacitor offers excellent mains voltage tolerance up to 1400Vac (WA class) as well as an extended temperature range of -55°C to +125°C. It can be used in power supply, AC mains filters, EMI suppression circuits, motor control and plastic welding applications.

Working Principle

The working principle of a film capacitor is quite simple. When a voltage is applied across film capacitor terminals, a charge builds up on the two ends of the capacitor. This charge increases with time, resulting in a current flow from one end of the capacitor to the other. The strength of this current depends on the amount of voltage applied and the capacitance of the device.

The charge on the capacitor drives the electric field between the two plates, creating a localized charge and resulting in an electrostatic field that appears in the form of a voltage on the wires. This voltage is denoted as capacitance, and it is measured in farads and described as C = Q/V, where Q is the charge and V is the voltage.

The capacitor acts as a buffer between the load and the power supply, allowing alternating current (AC) in the capacitor, whereas the load sees direct current (DC), thereby providing a low-pass filter for the AC waveform.

The capacitance of a film capacitor also plays a major role in the surge and inrush current protection. The large value of capacitance helps to reduce the high-frequency currents, which reduces the inrush current and therefore provides better surge protection for the system.

Applications

The 170123J630EB film capacitor is suitable for both AC and DC mains applications. It is widely used in automotive, consumer electronics, medical, industrial, lighting, and power supply applications. It is especially suitable for adjusting the current, voltage filter, signal filter, energy-saving transformer, resistance welding, and surge protection.

The high capacitance and low loss of this film capacitor makes it ideal for use in high voltage applications, such as AC mains filters, AC transmission and power conversion circuits, automotive and industrial motor control, power inverters, plastic welding equipment, and more.

Filtering and buffer designs benefit from the high insulation resistance and the low self-inductance of the film capacitors. The high capacitance values and excellent stability makes them suitable for power relay and safety device control circuit applications.

The 170123J630EB film capacitor is also widely used in consumer applications, such as home and office appliances, entertainment equipment, home medical equipment, and consumer electronics devices.

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