The role of slender electrolytic capacitors in circuits
Release time:
2022-08-31
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In a power supply circuit, the rectifier circuit converts alternating current (AC) into pulsating direct current (DC). After the rectifier circuit, a large-capacity, slender electrolytic capacitor is connected. Leveraging its charging and discharging characteristics, this capacitor smooths out the pulsating DC voltage from the rectifier, resulting in a relatively stable DC voltage. In practical applications, to prevent fluctuations in the supply voltages of various circuit components due to changes in the load, dozens to hundreds of fine, slender electrolytic capacitors are typically connected at both the power supply’s output end and the load’s power input end.
Long and slender electrolytic capacitor The role in the circuit
In a power supply circuit, the rectifier circuit converts alternating current into pulsating direct current. After the rectifier circuit, a large-capacity capacitor is connected. Long and slender electrolytic capacitor By leveraging their charge and discharge characteristics, the rectified pulsating DC voltage is transformed into a relatively stable DC voltage. In practical applications, to prevent fluctuations in the supply voltages of various circuit components due to changes in the load, dozens to hundreds of fine, elongated electrolytic capacitors are typically connected at the output end of the power supply and at the power input end of the load. Since large-capacity, elongated electrolytic capacitors generally have some inherent inductance, they cannot effectively filter out high-frequency and pulse interference signals. Therefore, a capacitor with a capacitance ranging from 0.001 to 0 µF is connected in parallel across their terminals to eliminate high-frequency and pulse interference. A capacitor is a component capable of storing electric charge. Its English name is "Capacitor," and it is usually represented by the letter "C." Capacitors are widely used in numerous applications within electronic devices. They play different roles in various circuits, such as coupling, bypassing, and filtering.
Capacitors play a filtering role in motherboards, switch-mode power supplies, inverters, and other components. Long and slender electrolytic capacitor In power supply circuits, after rectification, the mains voltage is converted into pulsating DC. The resulting DC output is suitable for large-capacity, elongated electrolytic capacitors. By leveraging the charging and discharging characteristics of these capacitors, the pulsating DC voltage is transformed into a relatively stable DC voltage. As we all know, an ideal capacitor itself does not incur any energy loss. However, this is merely an ideal condition; in reality, factors such as manufacturing processes and material properties inevitably lead to dielectric losses in capacitors. These losses externally manifest as a resistor connected in series with the capacitor. This equivalent series resistance is commonly referred to as "Equivalent Series Resistance," or ESR in English. When two capacitors are connected in parallel, their equivalent series resistance decreases. At the same time, the ripple current can be distributed evenly between the two capacitors, ensuring that each capacitor operates within its rated ripple current range. To ensure uniform distribution of ripple current, the lead impedance connecting each capacitor to the ripple current source must be identical—meaning that the length and width of the connections between the rectifier and each capacitor should be the same. Under these conditions, filtering performance is optimal. However, it’s not necessarily true that more capacitors are always better; other factors, such as cost, must also be taken into account. The primary purpose of using capacitors in a circuit is to block DC currents while allowing AC currents to pass through. Specifically, when the DC voltage approaches zero, the capacitor behaves approximately like an open circuit, whereas when the AC voltage approaches zero, it behaves approximately like a closed circuit.
Secondary use refers to a practice in switching power supply circuit design where, after the rectifier circuit outputs a signal, a large-capacity electrolytic capacitor is connected. This capacitor helps stabilize the pulsating DC voltage and effectively shunts harmful AC components to ground. Its primary function is to provide mutual coupling. Typically, it’s used in transmission and amplification circuits that handle low-frequency signals, preventing interference between the two static operating points while allowing only AC signals to pass through. As for its bypass function, it provides a low-impedance path for certain components within an AC circuit.
Keywords:
Long and slender electrolytic capacitor
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