High frequency electrolytic capacitor and ordinary electrolytic capacitor are two different types of capacitors. They have some differences in structure, working principle, performance characteristics, etc. The differences between high-frequency electrolytic capacitors and ordinary electrolytic capacitors will be introduced in detail below.
1. Structural differences:
High frequency electrolytic capacitor usually adopts high-frequency electrolyte and capacitor MC7805CTG The interior consists of two electrodes (anode and cathode) and electrolyte. Electrolyte is a liquid formed by dissolving conductive salt in organic solvent, which is characterized by high conductivity and low resistivity. The electrolyte enables the capacitor to charge and discharge rapidly at high frequencies.
Ordinary electrolytic capacitors are also composed of two electrodes and electrolyte, but the electrolyte they use is usually low-frequency electrolyte with low conductivity. The concentration of conductive salt in electrolyte is relatively low, and the conductivity of capacitor is also low. Therefore, the performance of ordinary electrolytic capacitors is poor at high frequencies.
2. Working principle difference:
High frequency electrolytic capacitor stores charge through ion migration of electrolyte. During charging, the cations in the electrolyte migrate to the cathode and the anions migrate to the anode, thus forming an electric field between the two electrodes of the capacitor. When the electric field reaches a certain strength, the cations and anions in the electrolyte will form a stable charge storage state.
Ordinary electrolytic capacitors also store charge through ion migration in the electrolyte. However, due to the low conductivity of the electrolyte, the ion migration speed is slow, so the charging and discharging speed of ordinary electrolytic capacitors is relatively slow.
3. High frequency characteristic difference:
High frequency electrolytic capacitors have lower ESR (Equivalent Series Resistance) and ESL (Equivalent Series Inductance), which makes them have lower impedance and better frequency response at high frequencies. High frequency electrolytic capacitors can quickly respond to high-frequency signals and provide stable capacitance values.
Common electrolytic capacitors have high ESR and ESL due to the low conductivity of electrolyte, which makes them have large impedance at high frequency and poor frequency response. Ordinary electrolytic capacitors are suitable for low-frequency or DC circuits and have weak response to high-frequency signals.
4. Difference between capacitance value and voltage:
Ordinary electrolytic capacitors usually have large capacitance values and high voltage ratings. They are suitable for applications where large charges are stored and high voltages are withstood.
High frequency electrolytic capacitors usually have smaller capacitance values and lower voltage ratings. They are mainly used in high-frequency circuits, requiring fast charging and discharging and low impedance.
In conclusion, there are obvious differences between high-frequency electrolytic capacitors and ordinary electrolytic capacitors in structure, working principle, high-frequency characteristics, capacitance value and voltage. The stability and performance of the circuit can be ensured by selecting the appropriate capacitor type according to the specific application requirements.
