Research On The Low Power Dissipation Of Peak Current-Mode Controlled Boost Converter

With the widely utilization of high efficiency electronic portable products in our daily lives, that has actuated the advancement of technique of DC-DC converter, the demand on high efficiency, high reliability and high power density becomes the new challenge to DC-DC converter.On the basis of the study of the interrelated technique of the boost converter,the circuit averaging modeling method of nonideal converts operating in the continuous conduction mode is presented, the dissertaion succeeds in deriving large-signal averaging circuit models, DC circuit models, small-signal equivalent circuit models corresponding to the power stage and peak current control circuit. Based upon these models, the transfers function of the small signal are obtained by way of steady analysis, and then a new topology of slope compensation and burst mode are put forward in the dissertaion for the purposes of low power dissipation.The low power dissipation is one of the most important design guidelines for DC-DC switching converters all the time. The current-mode PWM/PSM controller and nonsynchronous rectifier mode technology are used because of requirement of this design. The burst mode is introduced in the dissertaion that can improve the efficiency when converters work in the light load condition. So that the converter is able to change the type of modulation according to the load current. That's to say the converter can obtain the high efficiency over the wide load range. Furthermore, a new topology of slope compensation has been introduced into, piecewise linear compensation has been used in Current slope compensation to ensure a suitable compensation under different load intensity.The design is implemented base on the 0.6μm BCD technologies, Hspice simulation results of the whole Chip are given: the highest conversion efficiency of 94% can be achieved. Simulation results show that the chip has achieved the expected demand.