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本文结合实例介绍电容在电子电路中的作用。为方便定量分析,引入公式x_c=1/(2πfc)。式中x_c为电容器的容抗,反映电容器对电流阻碍作用的大小;f为电压的频率;C为电容器的电容量。由公式可见,X_c的大小不仅与f有关。而且与C有关且成反比。在同一频率的交流电路中,不同容量的电容器容抗不同,起的作用就不同;而同一电容器在不同频率的交流电路中,容抗不同,起的作用也不同;对于直流,因f=0,X_c=∞,电容器相当于开路,即阻断了直流电流通路。
This article describes the role of capacitors in electronic circuits with examples. To facilitate quantitative analysis, the introduction of the formula x_c = 1 / (2πfc). Where x_c is the capacitance of the capacitor, reflecting the size of the capacitor on the current obstruction; f is the frequency of the voltage; C is the capacitance of the capacitor. It can be seen from the formula that the size of X_c is not only related to f. And C-related and inversely proportional. In the same frequency of the AC circuit, the capacity of different capacitance tolerance, from the role of different; and the same capacitor in different frequency AC circuit, the capacitance of different, play a different role; for DC, due to f = 0 , X_c = ∞, the capacitor is equivalent to an open circuit, that is, blocking the DC current path.