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What are the nine main functions of SMT capacitors

2018-12-04 16:36

What are the nine main functions of SMT capacitors? There are many types of SMT capacitors, but what are their main functions? Now let Guanrong Electronics popularize these knowledge for everyone! The nine functions of SMT capacitors can be divided into the following points:

1、 Chip capacitors belong to energy storage components. It stores charges in the form of electric field energy. In circuits, this feature is commonly used to absorb interference pulse signals, smooth surge currents, and store electrical energy.

2、 When the voltage at the two terminals of the SMD capacitor is higher than the external circuit voltage (or power supply voltage), the SMD capacitor discharges from the external circuit until its voltage at the two terminals is equal to the external circuit voltage. If the external circuit voltage is zero, the SMD capacitor will completely discharge the stored electrical energy, that is, the voltage at the two terminals of the SMD capacitor is zero. In circuits, the purpose is the same as above.

3、 When the voltage at the two terminals of the SMD capacitor is higher than the external circuit voltage (or power supply voltage), the SMD capacitor discharges from the external circuit until its voltage at the two terminals is equal to the external circuit voltage. If the external circuit voltage is zero, the SMD capacitor will completely discharge the stored electrical energy, that is, the voltage at the two terminals of the SMD capacitor is zero. In circuits, the purpose is the same as above.

4、 When the SMT capacitor is just powered on, it is equivalent to a short circuit. Because at this time, the voltage at the two terminals of the SMT capacitor is zero, and the charging current is high. This is why alternating current and unstable direct current can pass through patch capacitors. In circuits, it can play a role in absorption, protection, etc.

5、 When the SMT capacitor is fully charged, it is equivalent to an open circuit. Because at this point, the voltage at the two terminals of the SMT capacitor is equal to the power supply voltage, and the charging current is zero. In circuits, direct current is difficult to pass through patch capacitors, which is precisely why.

6、 SMT capacitors are prone to passing through high-frequency AC currents and hinder the flow of low-frequency AC currents. In circuits, this feature is commonly used for frequency division and high-frequency filtering of AC signals.

7、 Chip capacitors allow AC current to flow, while blocking DC current. In circuits, this characteristic is commonly used for DC isolation, AC signal coupling, etc.

8、 The current in the SMT capacitor is 90 degrees ahead of its terminal voltage. In circuits, this feature is commonly used for phase shifting, phase compensation, motor starting, etc.

9、 The voltage at the two terminals of the SMT capacitor cannot be suddenly changed. In circuits, this feature is commonly used for clamping, bootstrap boosting, etc.

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