plc analog input modules basic knowledge sharing

plc analog input modules can be mounted directly on a printed circuit board power supply, which is characterized by specific integrated circuit (ASIC), digital signal processors (DSP), a microprocessor, a memory, a field programmable gate array (FPGA) and other digital or analog load to provide power. Generally, this type of module called load point (POL) power supply systems or use special point of power supply system (PUPS). Because of the many advantages of modular structure, so the module power is widely used  plc analog output module to exchange communications equipment, access equipment, mobile communications, microwave communications and optical transmission, routers and automotive electronics, aerospace and so on. Especially in recent years due to the continuous promotion of the rapid development of data services and distributed power supply system, an increase plc analog input modules have a power beyond. With the extensive use of semiconductor technology, packaging technology and high-frequency soft switching, power supply module power density increases, more and more high conversion efficiency, applications are increasingly simple.
plc analog input modules in switching power supply technology in the field of people are related to the development of power electronic devices side, while the development of the switching frequency technology, the two promote each other to promote the switching power supply to more than two-digit annual growth rates toward the light, small, thin, low noise , high reliability, interference direction. Switching power supply can be divided into AC / DC and DC / DC two categories, DC / DC converters are now modular and design techniques and manufacturing processes are mature and standardized at home and abroad, and has been recognized by users, but AC / DC modular, makes  plc high-speed counting module its own characteristics in the modular process, encountered more complex technology and manufacturing process problems. plc analog input modules, respectively, the following two types of switching power supplies for the structure and characteristics in order to elaborate
DC / DC converter is a fixed DC voltage into a variable DC voltage, also known as a DC chopper. Chopper work in two ways, first pulse width modulation Ts constant change ton (GM), the second is the frequency modulation (1) Buck circuit - Buck chopper, the average voltage output
U0 is smaller than the input voltage Ui, the same polarity. 2) Boost Circuit - boost chopper, the output voltage U0 is greater  Programmable Input Module than the average input voltage Ui, the same polarity (3) Buck-Boost circuit - buck or boost chopper output voltage U0 is greater than or less than the average the input voltage Ui, the opposite polarity, the inductor transmission (4) Cuk circuit - buck or boost chopper, the average output voltage is greater than or less than the input voltage U0 Ui, of opposite polarity, capacitance of the transmission. There Sepic, Zeta circuits. The above non-isolated circuit, the circuit has a forward isolated circuits, flyback, half-bridge circuit, full bridge circuit, push-pull circuit.