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Overcurrent protection circuit: Tell you about the points for attention in choosing a resistor There are many types of fixed resistors. The materials and structures you choose will depend on the specific requirements of your application circuit. High frequency circuits need to use unwound resistors with low distributed inductance and small capacitance, such as carbon film resistors, metal resistors, metal oxide resistors, etc. Low noise resistors should be used in high-gain and small-signal amplifiers such as metal film resistors, carbon film resistors, and winding resistors. Rather than high-noise synthetic carbon film resistors and organic solid resistors.

When the varistor works, each varistor unit bears surge energy, and these varistor units are generally evenly distributed throughout the resistance body, that is, the whole resistance body bears energy, rather than only the junction region bears electrical power like Zener diode voltage regulator. This is also the reason why ceramic varistor has much larger current and energy quota than Zener diode voltage regulator. Its resistance value varies with the terminal voltage.

Varistor is a resistance device with nonlinear voltammetry characteristics. It is mainly used to clamp voltage when the circuit is subjected to overvoltage, absorb excess current, and protect sensitive devices. The resistance material of rheostat is semiconductor, which is a voltage limiting protection device. By using the nonlinear characteristic, the overvoltage between the two poles can be clamped to a relatively fixed voltage value, so as to realize the protection of the rear circuit.

电源板包封厂家说说电源模块的作用： 一、隔离： 1、安全隔离：强电弱隔离\IGBT隔离驱动器\浪涌隔离保护\雷电隔离保护，如人体接触的医疗电子设备的隔离保护。 2、噪声隔离： (模拟电路和数字电路隔离，强弱信号隔离)

当然电源板包封厂家认为，PC1的4发外部定时源R2、C2和PC1芯片本身也构成冲击电路的一部分。 2)稳压器电路：N3、D3、C5等5V电源、R7至R10、PC3、R5、R6等组件构成稳压器控制电路。

SMD patch varistors take advantage of the nonlinear nature of rheostat. When an overvoltage occurs between the two poles of the rheostat, the rheostat can clamp the voltage to a relatively fixed voltage value, thus protecting subsequent circuits. It has the advantages of small size, light weight, high installation density, strong anti-seismic ability, strong anti-interference ability and good high-frequency characteristics. Widely used in computers, mobile phones, electronic dictionaries, medical electronic products, video recorders, electronic meters and VCD players.