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Four major trends in today's thin film switching power supply technology

From:admin Date: 2019-01-14
Four major trends in today's thin-film switching power supply technology: power supply technology has always been one of the most important technical fields in electronic circuit research, and switching power supply technology is the main technology in power supply technology. The following technical article is a good example of some recent advances in switching power supply technology in recent years.
1. Non-isolated DC/DC technology develops rapidly
In recent years, non-isolated DC/DC technology has developed rapidly. At present, a set of electronic equipment or electronic systems requires the power supply system to provide multiple voltage levels due to different loads. For example, a desktop PC requires four voltages of +12V, +5V, +3.3V, and -12V, and a standby voltage of +5V. The motherboard requires 2.5V, 1.8V, 1.5V, or even 1V. It is impossible to give such a large voltage output in a set of AC/DC, and most of the low-voltage supply current is large, so many non-isolated DC/DCs have been developed, which can basically be divided into two categories. One type contains a power switching element internally, called a DC/DC converter. The other type does not include a power switch and requires an external power MOSFET called a DC/DC controller. According to the circuit function, there are step-down STEP-DOWN, boost BOOST, BUCK-BOOST or SEPIC which can be lifted and lowered, and INVERTOR which converts positive pressure into negative pressure. Among them, the most varieties, the fastest growing is STEP-DOWN. According to the size of the output current, it is divided into single-phase, two-phase and multi-phase. The control method is mainly PWM, and a small part is PFM.
In the non-isolated DC/DC conversion technology, TI's pre-detection gate drive technology uses digital technology to control synchronous BUCK. The DC/DC conversion efficiency of this technology can reach up to 97%, of which TPS40071 is its representative product. The BOOST boost mode also has a synchronous BOOST product that uses a MOSFET instead of a diode. In the low-voltage field, the efficiency is increased to a large extent, and efforts are being made to further eliminate the conduction and reverse recovery of the body diode of the MOSFET.
Second, the membrane switch power supply blows the digital horn
At present, in the entire electronic analog circuit system, television, audio equipment, photo processing, communication, network, etc. are gradually digitized, and the last fortress without digitization is the power supply field. In recent years, the research momentum of digital power sources has not diminished, and the results have been increasing. The companies that have taken the lead in power digitalization are TI and Microchip. TI has both DSP advantages and UNITRODE, a professional manufacturer of PWM ICs. The company has used TMS320C28F10 to make 48V output high-power power modules for communication. The PFC and PWM parts are completely digitally controlled. Now, TI has developed a number of digital PWM control chips. Currently mainly UCD7000 series, UCD8000 series and UCD9000 series, they will become the pathfinder of the next generation digital power supply. They generally include both hardware and software programming. The hardware part includes the logic part of the PWM, the clock, the analog-to-digital conversion of the amplifier loop, the digital-to-analog conversion, and the digital processing, driving, detection and processing of synchronous rectification.
At present, the competition in the power supply field is mainly the competition of performance price, so digital power has a long way to go, but the digital horn of the power supply field has already blown.
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