875115952001 Capacitors

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Aluminum - Polymer Capacitors

Aluminum-polymer capacitors, also known as hybrid aluminum electrolytic capacitors, are a microscopic device made of formed aluminum layers. The composition includes segments of alternating anode and cathode layers, in which electrodes are separated by a dielectric barrier. They are typically characterized by very large capacitance values, low ESR, long life, low failure rate, and low leakage current. They use an organic molecule or polymer as a medium between the electrodes, often referred to as a “foxy” mechanism, providing an improved charge-discharge life cycle and superior temperature performance compared to other types of capacitor.

An 875115952001 application field involves the creation of capacitors mainly for industrial and automotive purposes, including power management and protection, motor control, decoupling capacitors for switching regulators, instrumentation, and feedback circuits. Other applications include high-frequency circuits, where low ESR and loss tangent involves optimal value, minimizing high-frequency losses.

The working principle involves the following steps:

1. The anode layer is formed by spraying a conductive layer composed of aluminum powder onto an anode membrane, producing an electrical bridge between the anode and cathode.

2. The liquid electrolyte solution is then injected into the cathode side, while the membrane is left empty to form a gap between the anode and cathode.

3. A specialized polymer is then used to fill the gap between the anode and cathode layers, creating a dielectric barrier.

4. The dielectric barrier is then allowed to cure, completing the capacitance value.

One of the biggest advantages of aluminum-polymer capacitors is their very high endurance lifetimes. Depending on the application, they can last up to 10 times longer than other types of capacitors, resulting in incredibly low failure rates and improved energy efficiency in the applications they are used in.

Aluminum-polymer capacitors are also known for their higher temperature stability compared to other capacitors. The organic dielectric eliminates degradation of the capacitance as a function of temperature, allowing them to maintain a constant capacitance as the temperature fluctuates.

In addition to power management and protection, other uses of aluminum-polymer capacitors include slow-charge protection, overcharging protection, waveform shaping, voltage regulation, charge-discharge cycles, frequency shaping, and fast motor stabilization.

Aluminum-polymer capacitors are a versatile and effective solution for applications requiring large capacitance values and a high level of durability. Not only do they offer improved performance over other types of capacitors, but their extended lifetimes reduce the need for maintenance and service calls, leading to a more efficient and reliable system.

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