电路板上不同型号的贴片式电容起什么作用
作者:红宝电容 来源:http://www.nthuixin.com 日期:2020-09-29 11:15 浏览

  贴片电容可分为无极性和有极性两类,贴片电容的主要作用就是清除由芯片自身产生的各种高频信号对其他芯片的串扰,从而让各个芯片模块能够不受干扰的正常工作。

  Chip capacitors can be divided into two types: non polarity and polarity. The main function of chip capacitors is to eliminate the crosstalk of various high-frequency signals generated by the chip itself to other chips, so that each chip module can work normally without interference.

  在高频电子振荡线路中,贴片电容与晶体振荡器等元件一起组成振荡电路,给各种电路提供所需的时钟频率。

  In high frequency electronic oscillation circuit, chip capacitor and crystal oscillator are used to form oscillation circuit to provide clock frequency for various circuits.

  贴片电容有贴片式陶瓷电容、贴片式钽电容、贴片式铝电解电容。电路板上贴片电容的作用及极性的区分方法贴片式陶瓷电容无极性容量也很小(PF级),一般可以耐很高的温度和电压,常用于高频滤波。

  Chip capacitors include ceramic chip capacitors, tantalum capacitors and aluminum electrolytic capacitors. The function of chip capacitor on the circuit board and the method to distinguish the polarity. The non-polar capacity of chip ceramic capacitor is also very small (PF level). It can withstand high temperature and voltage, and is often used in high-frequency filtering.

贴片式电容

  1、贴片式钽电容

  贴片钽电容的特点是寿命长、耐高温、准确度高、滤高频改波性能极好,不过容量较小、价格也比铝电容贵,而且耐电压及电流能力相对较弱,被应用于小容量的低频滤波电路中。

上海15选5玩法  Tantalum chip capacitors are characterized by long service life, high temperature resistance, high accuracy, excellent high frequency and wave changing performance. However, the capacity is smaller, the price is higher than that of aluminum capacitors, and the voltage and current resistance capacity is relatively weak, so it is used in low-frequency filter circuits with small capacity.

  2、贴片式铝电解电容

  贴片式铝电解电容拥有比贴片式钽电容更大的容量,其多见于显卡上,容量在300μF~1500μF之间,其主要是满足电流低频的滤波和稳压作用。

  The capacity of chip type aluminum electrolytic capacitor is larger than that of tantalum chip capacitor. It is often found on the display card, and the capacity is between 300 μ F and 1500 μ F. it is mainly used to filter and stabilize the current at low frequency.

  3、贴片电解电容

  贴片电解电容的正负极区分和测量电容上面有标志的黑块为负极。在PCB上电容位置上有两个半圆,涂颜色的半圆对应的引脚为负极。也有用引脚长短来区别正负极长脚为正,短脚为负。

  The black block marked on the capacitor is the negative pole. On the PCB, there are two semicircles on the capacitor position, and the pin corresponding to the colored semicircle is the negative pole. Also useful pin length to distinguish between positive and negative, long pin is positive, short pin is negative.

上海15选5玩法  电容两极之间的电阻叫做绝缘电阻或漏电电阻。只有电解电容的正极接电源正(电阻挡时的黑表笔),负端接电源负(电阻挡时的红表笔)时,电解电容的漏电流才小(漏电阻大)。

  The resistance between the two poles of a capacitor is called insulation resistance or leakage resistance. Only when the positive pole of the electrolytic capacitor is connected to the positive power supply (the black probe when the resistance is blocked) and the negative terminal is connected to the negative power supply (the red probe when the resistance is blocked), the leakage current of the electrolytic capacitor is small (the leakage resistance is large).

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  Shandong Hongbao Electronic Co., Ltd. is a professional agent of electronic components Service Providers, capacitors, resistors, fuses, inductors have great advantages, massive inventory, original factory authorization, ultra-high cost performance.