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The thin film switch power technology four major trends

The thin film switch power supply technology four big trends: power supply technology has been one of the most important technologies in the field of electronic circuit, and switching power supply technology, is the key technology in power supply technique. This technical paper the following extract, can well explain the switching power supply technology in some new progressin recent years.

A rapid development of DC/DC technology, non isolation

In recent years, the rapid development of non isolated DC/DC technology. At present, a set of electronic equipment or electronic system due to different load, will require the power system provides a plurality of voltage block level. Such as the desktop PC requires +12V, +5V, +3.3V,-12V four kinds of voltage and the standby +5V voltage, the motherboard will need 2.5V, 1.8V,1.5V and 1V etc.. The voltage output is given so many may not be a AC/DC, while the majority oflow voltage power supply current is very big, therefore the development of a lot of non isolatedDC/DC, they basically can be divided into two categories. A kind of inside contains powerswitching elements, called the DC/DC converter. Another kind of not containing the power switch, the need for external power MOSFET, called the DC/DC controller. According to the circuit function, STEP-DOWN, boost buck BOOST, and can lift pressure of BUCK-BOOST or SEPIC, and positive pressure turn into negative pressure INVERTOR. Among them the most varieties, the most rapid development or reducing STEP-DOWN. According to the size of the output current, divided into single-phase, two-phase and multiphase. The control mode based on PWM, a few PFM.

In the non isolated DC/DC converter technology, TI's pre measured gate drive technique usingdigital technology to control the synchronous BUCK, using this technology, the DC/DCconversion efficiency can reach 97% of the maximum, where TPS40071 are the representativeproducts. BOOST boost is also of the synchronous BOOST with MOSFET instead of diodeproducts. In low pressure areas, increase the efficiency greatly, and is trying to guide and to eliminate the body diode reverse recovery problems MOSFET.

Two, thin film switch digital horn sounded

At present in the electronic circuit simulation system, TV, audio equipment, photo processing,communication and network have gradually realized the digital, and finally a no Digital Fortressis the power field. In recent years, the momentum of digital power supply reduction, results are more and more. Go ahead in the digital power aspects of the company are TI and Microchip. TIcompany has both the advantages of DSP, and the acquisition of PWM IC UNITRODE professional manufacturer, the company has made of TMS320C28F10 48V output power supplymodule for communication, in which PFC and PWM fully digital control. Now, TI has developed a variety of digital PWM control chip. At present the main UCD7000 series, UCD8000 series and UCD9000 series, they will become the next generation of digital power supply of the pathfinder.They basically includes hardware, but software programming. The hardware module logic, clock,amplifier loop includes PWM conversion, digital to analog conversion and digital processing,drive, synchronous detection and treatment.

Currently in power in the field of competition is the main performance to price competition, so thedigital power supply is still a long way to go, but the power in the field of digital has sounded the clarion call.

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