ABB KSD211B 电源输入耦合模块，其实在电路中能量也是需要被相互传送的，这里要提到“耦合”的概念。耦合是指把能量从一个电路传送另外一个电路中去，耦合在模拟电路和数字电路中非常常见，微弱的信号可以耦合到放大电路进行放大，经过放大的信号同样可以通过耦合进行输出。ABB KSD211B 电源输入耦合模块耦合是两个功能电路的连接桥梁，可以实现信号和能量的传递。常见的耦合电路有直接耦合电路、电容耦合电路、光电耦合电路和变压器耦合电路。
KSD211B
输入的信号经过三极管T1放大后，直接耦合连接至T2进行二级放大，然后再次直接耦合到T3进行三极放大。因为各级电路直接连接，会相互影响，常用于低频的电路和大规模集成的数字电路中。阻容耦合：ABB KSD211B电源输入耦合模块在阻容耦合电路中，两级电路通过电容进行隔离，信号通过电容耦合到下一级，因为电容有着隔直流通交流的作用，各级电路的Q点不会相互影响，不能放大缓慢放大的信号，所以常用于交变的高频信号。
KSD211B
变压器耦合：在变压器耦合电路中，两级之间通过了变压器进行了隔离，变压器需要通过电磁感应的方式传输信号，所以不适用于直流信号，一般用在交流的信号中。它的低频特性差，体积大。ABB KSD211B电源输入耦合模块但两级之间相互独立，静态工作点不会相互影响，可以实现阻抗变换。直接耦合：在直接耦合中，两个功能电路直接连通，两级之间有着直接的影响，在下图的放大电路中。
KSD211B
The ABB KSD211B power input coupling module actually requires energy to be transmitted to each other in the circuit, and the concept of “coupling” should be mentioned here. Coupling refers to the transfer of energy from one circuit to another, which is very common in analog and digital circuits. Weak signals can be coupled to amplification circuits for amplification, and amplified signals can also be output through coupling. ABB KSD211B power input coupling module coupling is a bridge connecting two functional circuits, which can achieve signal and energy transmission. Common coupling circuits include direct coupling circuits, capacitive coupling circuits, optoelectronic coupling circuits, and transformer coupling circuits.
KSD211B
The input signal is amplified by the transistor T1, directly coupled to T2 for secondary amplification, and then directly coupled to T3 again for triode amplification. Because all levels of circuits are directly connected and can affect each other, they are commonly used in low-frequency circuits and large-scale integrated digital circuits. Resistance capacitance coupling: ABB KSD211B power input coupling module is used in the resistance capacitance coupling circuit. The two-stage circuit is isolated by capacitors, and the signal is coupled to the next stage through capacitors. Because capacitors have the function of isolating direct flow AC, the Q-points of each stage of the circuit do not affect each other and cannot amplify slowly amplified signals, so it is commonly used for high-frequency signals with alternating current.
KSD211B
Transformer coupling: In a transformer coupling circuit, the two stages are isolated by a transformer. The transformer needs to transmit signals through electromagnetic induction, so it is not suitable for DC signals and is generally used in AC signals. It has poor low-frequency characteristics and a large volume. ABB KSD211B power input coupling module, but the two stages are independent of each other, and the static working points will not affect each other, which can achieve impedance transformation. Direct coupling: In direct coupling, two functional circuits are directly connected and have a direct impact on each other, as shown in the amplification circuit in the figure below
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