Solid capacitors are called: solid aluminum electrolytic capacitors. The biggest difference between it and ordinary capacitors (that is, liquid aluminum electrolytic capacitors) is that different dielectric materials are used. The liquid aluminum capacitor dielectric material is an electrolyte, and the solid capacitor dielectric material is a conductive polymer material.
Advantages of solid capacitors
1. High stability
Solid aluminum electrolytic capacitors can continue to work stably in high-temperature environments, and the use of solid aluminum electrolytic capacitors can directly improve the performance of the motherboard. At the same time, due to its stable impedance over a wide temperature range, it is suitable for power supply filtering. It can effectively provide stable and abundant power, which is especially important in overclocking.
Solid capacitors can still work normally in high-temperature environments and maintain various electrical properties. Its capacitance does not change more than 15% over the entire temperature range, which is significantly better than liquid electrolytic capacitors. At the same time, the capacitance of the solid electrolytic capacitor is basically independent of its working voltage, so as to ensure its stable operation in a voltage fluctuation environment.
2. Long life
Solid aluminum electrolytic capacitors have a very long service life (the service life exceeds 50 years). Compared with liquid aluminum electrolytic capacitors, it can be counted as “long life.” It will not be broken down, and there is no need to worry about the drying up of liquid electrolyte and leakage to affect the stability of the motherboard. Since there are no problems with liquid electrolytes, solid aluminum electrolytic capacitors make the motherboard more stable and reliable.
The solid electrolyte will not evaporate and expand like a liquid electrolyte in a high-temperature environment, or even burn. Even if the temperature of the capacitor exceeds its tolerance limit, the solid electrolyte is only melted, which will not cause the metal shell of the capacitor to burst, so it is very safe.
The working temperature directly affects the life of electrolytic capacitors. The life of solid electrolytic capacitors and liquid electrolytic capacitors is significantly longer under different temperature environments.
3. Low ESR and high rated ripple current
ESR (EquivalentSeriesResistance) refers to series equivalent resistance and is a very important indicator of capacitance. The lower the ESR, the faster the capacitor charging and discharging speed. This performance directly affects the decoupling performance of the power supply circuit of the microprocessor. The advantage of low ESR characteristics of solid electrolytic capacitors in high-frequency circuits is more obvious. It can be said that the low ESR characteristic at high frequencies is a watershed in the difference between the performance of solid electrolytic capacitors and liquid capacitors. The ESR of solid aluminum electrolytic capacitors is very low and has very little energy dissipation. The extremely low ESR characteristics of solid capacitors under high-temperature, high-frequency and high-power operating conditions can fully absorb the high-amplitude voltage generated between power lines in the circuit to prevent it from interfering with the system.
At present, the power consumption of the CPU is very large, and the main frequency has far exceeded 1GHz. At the same time, the peak current of the CPU has reached 80A or more, and the output filter capacitor is close to the critical point of operation. On the other hand, the CPU uses multiple working modes, most of the time in the conversion process of the working mode. When the CPU changes from a low power consumption state to a full load state, a large amount of energy required for the instantaneous (usually less than 5 millisecond) switching of this CPU comes from the capacitor in the CPU power supply circuit. At this time, the high-speed charge and discharge characteristics of the solid capacitor can be instantaneous High peak current output to ensure adequate power supply and ensure CPU stable operation.
