In recent years, various electronic products have developed into miniaturization and miniaturization, and have entered people's lives in the form of big bangs. The volume and weight of the power supply account for a large part of the whole product. Power transformers, power control ICs, MOS tubes, rectifier diodes, electrolytic capacitors and ceramic capacitors are essential components in the power supply circuit. How should we work on these devices to gradually reduce the size of the power supply?
First of all, let's compare the power products that are fat and thin. Where are they in the wrong place, what applications and technologies make them different.
Figure 1 Comparison of various power supplies
Also require the same quality power supply, you definitely want to use a small size and light weight power supply. How can we reduce the size and weight of the power supply based on the guaranteed power performance? What measures and new technologies can be used? Here are some ways to reduce the volume of the power supply.
First, DC-DC chip increases synchronous rectification, reducing power supply volume and weight:
Synchronous rectification is a new technology that uses a very low on-resistance power MOSFET to replace the rectifier diode to reduce rectification losses. The turn-on loss of the MOS transistor is greatly reduced. The power MOSFET of the same power generally uses the PCB to dissipate heat, and the diode rectification requires the use of a heat sink.
The following is a simple DC-DC chip MP4420 with a synchronous rectifier chip technology.
Figure 2 with synchronous rectification DC-DC chip
Figure 3 synchronous rectification Buck circuit
The MP4420 integrates the two MOSFETs Q1 and Q2 in Figure 3 and is packaged in a SOT23-8. It is only necessary to add an inductor and a capacitor to the periphery of the chip to realize the DC-DC conversion function, thereby saving the product volume.
Second, the AC-DC power supply uses the primary side feedback to save some devices:
The primary side feedback (PSR) AC-DC control technology is a new AC-DC control technology developed in the last 10 years. Compared with the traditional secondary feedback optocoupler plus TL431 structure, its biggest advantage is that it is omitted. These two chips and a set of components that work with them save space on the system board and reduce circuit cost while ensuring reliability.
MPS currently has a series of 5~15W primary feedback control chip solutions. MP020 is a constant voltage constant current (CV/CC) switch chip with integrated 700V MOSFET, which can easily achieve high precision voltage regulation and constant current output.
Figure 4 AC-DC primary feedback application
Third, miniaturized power module applications, reducing product size:
The power module can be directly mounted on the printed circuit board, and the module product has advantages in terms of volume, heat dissipation and reliability due to the design of the glue module. AC-DC power supplies often need to meet some safety distances, resulting in a large area of ​​AC-DC circuit. AC-DC power modules can greatly reduce the distance between components and wiring due to the use of glue packaging, which can greatly improve the power supply. Power density.
Figure 5 small size power module
The small-volume product design starts with the power supply, and Zhou Ligong can provide a compact power supply design from AC-DC to DC-DC chip solutions. The small-volume power module introduced by Zhou Zhigong's Guangzhou Zhiyuan Electronics, ZY0FBxxD-2W series modules, is designed with special design technology and can be used normally without any peripheral devices. The volume is only 31.8*20.3*10.5mm. At the same time, Zhou Ligong's MPS product line also introduces a large number of sub-packaged power IC products, such as the MP4420's SOT23-8 small-volume package, while using the built-in synchronous rectification process to save the freewheeling diode, which is the best choice for small-volume design. .
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