Research And Design Of High Efficiency Switch Converter With Multi-model Transition

In this paper, several digital switching converter models and multi-model varyingare depicted. A complete verifying attachment and test system for digital multi-modelswitching converter were designed. PWM, PFM and PSM converter models base ondigital modulate can be implemented on it. Several experiment for multi-model varyingare done base on the system. Ingredients which influence converter’s efficiency andsome methods for improvement converter’s efficiency are depicted in this disquisition.In this study the following content are referred:1. Verifying attachment and test system design.2. Digital switch converter modules in Boost topology implementation.3. Multi-model varying in PWM, PFM and PSM modulate models.Several factors influence Boost digital converter’s efficiency. The first one isdigital system power dissipation. The second is turn on and turn off wasting in powerMOSFET. The third is driving dissipation for power MOSFET. The fourth is resistancewasting in main circuit. The fifth is magnetism leakage in inductance. Multi-modelvarying model are designed for the reducing of turn on and turn off wasting and drivingdissipation for power MOSFET. Researches are carried into execution on the verifyingattachment and test system.The verifying attachment and test system are consisted of circuit board, VGAmonitor, mouse and programmable DC power. The system communicated to PC withserial port linkage. It’s easy for data update, storage and more processing in experiment.System circuit board contained the following sub circuits: FPGA, A/D converter, detectand magnify circuit, Boost circuit, programmable load, VGA port, PS/2port, UARTport, IIC port and GPIO terminals. Digital switch converter can be implemented in theboard. The base factor and dynamic character of the implemented converter can bedisplayed. It is integrative experiment platform for Boost DC-DC digital switchconverter design. In this platform, the factors are modification dynamically, theinput/output voltage, current, power and other state signal which want to observationcan be displayed intuitively. It’s efficiency for switch converter experiment. Digital switch converter is based on Boost topological structure in this disquisition.PWM, PFM and PSM modulate models are achieved. The feedback can be comparatoror A/D converter separately. Simple arithmetic and accelerate arithmetic areimplemented separately. Several switch converter models are implemented on theplatform. They are work steady. The feasibilities are validated, that digital switchconverter can be consisted just by comparator or A/D converter.The multi-model varying in this paper is based on the load stat and energy forecast.Load power and system dissipation are calculated dynamically. Load forecast isobtained trough IIC port. Then modulate models are varied judge by the three model’scharacter. This paper researched the load power forecasting method base on duty-cycle,which in PWM, PFM and PSM models separately, when signal comparator or threecomparators are used separately. In A/D converter usage, the power is gained by theproduct of voltage and current straightly. The multi-model dynamic varying is achievedthrough those models.The digital multi-model switch converter base on FPGA has energy dissipationwitch can’t be ignored when stand by. So in light load the high efficiency for transformcan’t be achieved. Here the advantage of PSM modulation has not been exerted. Thelower dissipation FPGA and circuit wasting reduce are demanded for the popularizationof the switch converter base on FPGA. FPGA is affluent in logic resources, manydissimilar power converters can be implemented in the same time. The power supply forequipment can be solved in a chip. A self power supply method was experimented inthis paper. Linear power supplies are utilized when power on; self controlled digitalswitch converters are utilized in normal. This is a way to reduce system dissipationpromote.