Refer to RIFA's formula for life expectancy:

PLOSS= (IRMS) &Sup2; XESR (1)

Th=Ta+PLOSSxRth (2)

Lop=Ax2 Hours (3)

A-reference temperature value (typical value is 85°C)

B - Capacitor life at reference temperature (varies according to point vessel diameter)

C = the temperature rise required to reduce the life of the capacitor in half

  From the above formula, we can clearly see that there are several direct factors that affect the life of electrolytic capacitors: ripple current (IRMS) and equivalent series resistance (ESR) rise linearly with energy loss

When the capacitor is charged and discharged, the current will cause energy loss when flowing through the resistor. The voltage change will also cause energy loss when passing through the dielectric. In addition to the energy loss caused by leakage current, the result of all these losses is the internal temperature of the capacitor. rise.

4.1. Design considerations

  In non-solid electrolyte capacitors, the dielectric is the oxide layer of the anode aluminum foil. The electrolyte acts as an electrical contact between the oxide layers of the cathode aluminum foil and the anode aluminum foil. The paper interlayer that absorbs the electrolyte becomes the isolation layer between the cathode aluminum foil and the anode aluminum foil, and the aluminum foil is connected to the terminal of the capacitor through the electrode lead:

 • By lowering the ESR value, the internal temperature rise caused by the ripple current in the dot volume can be reduced. This can be achieved by using multiple electrode lead tabs, laser welding electrodes, etc.

The ESR value and ripple current determine the temperature rise of the capacitor. One of the main measures to make the capacitor have a satisfactory ESR value is: usually one or more metal electrode leads are used to connect the external electrode and the core package to reduce the impedance between the core package and the pins. The more electrode leads and 1 tabs on the core package, the lower the ESR value of the capacitor. With the help of laser welding technology, more electrode leads can be added to the core package, so that the capacitor can achieve a lower ESR value. This also means that the capacitor can withstand higher ripple current and have lower internal temperature rise, which means longer operating life. Doing so also helps to improve the capacitor's ability to resist vibration, which may otherwise lead to internal short circuits, high leakage currents, loss of capacitance, increased ESR values, and open circuits.

 • Through the good mechanical contact between the capacitor core package and the bottom of the aluminum shell and the ripening in the core package, the internal cooked content of the capacitor can be effectively released from the bottom of the aluminum shell to the chassis connected with it. The internal thermal conduction design is extremely important for the stability and operating life of the capacitor. In EvoxRifa's design, the negative aluminum foil is extended to directly touch the bottom of the capacitor's aluminum shell thickness. This bottom becomes the heat sink of the core package, so that the heat of the hot spot can be released. If you choose to install the capacitor with bolts and safely install the capacitor on the chassis (usually aluminum plate), you can get a more comprehensive conductive solution with lower resistance (Rth.)

A 4700uF 63V capacitor can be used in various electronic circuits that require higher capacitance values and voltage ratings. Here are a few situations where a capacitor of this specification may be used:

Power Supply Filtering: Similar to the 1000uF capacitor, a 4700uF 63V capacitor is suitable for power supply filtering applications. It can effectively smooth out voltage fluctuations and reduce ripple in power supply circuits that require higher capacitance values.

Audio Amplifiers: In audio amplifier circuits, larger capacitors are often used for power supply filtering and decoupling purposes. The higher capacitance value of 4700uF helps in providing a stable power source for the amplifier, reducing noise and improving overall performance.

Motor Control Circuits: Capacitors with higher capacitance values are sometimes used in motor control circuits, especially for larger motors. The 4700uF capacitor can assist in providing sufficient power and reducing voltage drops during motor startup and operation.

Power Factor Correction: Power factor correction circuits aim to improve the efficiency of electrical systems by minimizing reactive power. Capacitors with higher capacitance values, such as 4700uF, can be employed in these circuits to help balance and improve the power factor.

Energy Storage in Alternative Energy Systems: Capacitors are also used in alternative energy systems like solar or wind power systems. The 4700uF capacitor can be used for energy storage applications, such as storing excess energy generated by the system for later use.