The power supply module is a power supply that can be directly packed on the printing circuit board. Array (FPGA) and other numbers or simulation loads provide power supply.

Generally speaking, such modules are called load (POL) power supply system or using point power supply system (PUPS). Due to the advantages of module structures, module power supply is widely used in the fields of switching equipment, access equipment, mobile communications, microwave communication, light transmission, router and other communications fields, and automotive electronics, aerospace, etc.

Especially in recent years, due to the rapid development of data business and the continuous promotion of distributed power supply systems, the growth rate of module power has exceeded once. The module power supply has an isolation effect, strong anti -interference ability, and its own protection function, which is convenient for integration. With the large use of semiconductor technology, packaging technology and high -frequency soft switches, the power density density of module power is getting larger and larger, the conversion efficiency is getting higher and higher, and the application is becoming easier and simpler.

People in the field of switching power supplies are related power electronic devices and develop switching frequency conversion technology. The two promotes each other to promote the growth rate of switching power supply to light, small, thin, and low noise at the growth rate of more than two digits per year. , Development of high reliability, anti -interference direction. The switching power supply can be divided into two categories: AC/DC and DC/DC. The DC/DC converter has now been modularized, and the design technology and production processes are mature and standardized at home and abroad, and have been recognized by users. However The modularization of AC/DC is due to its own characteristics to encounter more complex technology and process manufacturing problems in the modular process.

The structure and characteristics of the two types of switching power supply are described below

DC/DC transformation is a variable DC voltage to a fixed DC voltage, also known as DC chopping waves. There are two ways to work in the chopper. One is that the pulse width adjustment method is unchanged, changing TON (universal), and the second is frequency modulation

(1) BUCK Circle -Anti -voltage -cutting waveler, its output average voltage U0 is less than the input voltage UI, and the polarity is the same.

(2) BOOST Circle -Big voltage Bauer, its output average voltage U0 is greater than the input voltage UI, the polarity is the same.

(3) Buck -Buost Circuit -Anti -voltage or boosting chopper, its output average voltage U0 is greater than or less than input voltage UI, the polarity is the opposite, and the inductance transmission.

(4) CUK circuit -antihypertensive or voltage chopper, its output average voltage U0 is greater than or less than input voltage UI, the opposite polarity, capacitor transmission. There are also Sepic and Zeta circuits.

The above is a non-isolated DC-DC converter circuit. The isolated DC-DC converter has a positive excitement circuit, anti-excitement circuit, a half-bridge circuit, full bridge circuit, and pushing circuit.

Today's soft switching technology has led to a qualitative leap in DC/DC. A variety of ECI soft switch DC/DC converters designed and manufactured by VICOR company in the United States. Its maximum output power is 300W, 600W, 800W, etc. It is (6.2, 10, 17) W/CM3, and the efficiency is (80-90)%. The latest high-frequency switching power module RM series with soft switching technology with soft switching technology is launched by TDK-LEMBDA. Its switching frequency is (200-300) KHz, and the power density has reached 27W/CM3. Base diode), which improves the efficiency of the entire circuit to 90%.

AC/DC transformation is to transform AC into DC. Their power flow can be two -way. The power flow is called "rectification" from the power flow to the load. The power flow returns the power supply from the load. Essence AC/DC converter input is an AC power of 50/60Hz. Because it must be rectified and filtered, the relatively large filter capacitor is essential. At the same time, due to safety standards (such as UL, CCEE, etc.) and EMC instructions due Limitations (such as IEC, FCC, CSA), the AC input side must add EMC filtering and use components that meet the security standards, so as to limit the miniaturization of the volume of AC/DC power supply. The current switching action makes it difficult to solve the problem of EMC electromagnetic compatibility. It also puts forward high requirements on the design of the internal high -density installation circuit. Due to the same reason, the high voltage and large current switches have increased the loss of the power supply, which is limited to restrictions. The process of modularization of the AC/DC converter must use the power system optimization design method to make its work efficiency achieve a certain degree of satisfaction.

AC/DC Change according to the wiring method of the circuit can be divided into, semi -wave circuits and full -wave circuits. According to the number of power supply, it can be divided into, single phase, three phases, and multi -phase. According to the circuit's working quadrant, it can be divided into a quadrant, two -quadrant, three quadrant, and four -quadrant.