The Design Of A High Efficiency, Hybrid Control Buck Converter

With the rapid development of electronic technology, the life of modern can't leave all kinds of electronic products, such as cellular phones, personal digital assistants, and notebook. Driven by the prevalence of semiconductor integrated circuits and all electronic circuits, the cost, and size of the electronic systems must be reduced as much as possible. The solution of those problems can be solved by using advanced semiconductor processes. The performance requirements were cited to the direction of saving power and high efficiency. Battery is the only power source for portable equipment. In order to prolong the service time of these battery-operated equipments, ultra-low-power consumption is demanded. The main method that decreases the power losses is to higher the conversion efficiency and to lower the operating voltage. The stated intention is to create a new architecture that can make higher efficiency.Power loss is a critical factor to decide the conversion efficiency of the power. Losses in a switch-mode converter can be classified as: load dependent conduction losses (due to transistor on-resistance, diode forward voltage drop, inductor winding resistance, capacitor equivalent series resistance); frequency dependent switching losses (due to transistor and diode output capacitance charge and discharge, gate-drive losses, voltage/current overlap at switching transitions, inductor core losses, and controller frequency-dependent power consumption); fixed losses (due to controller standby current, and leakage currents of transistors, diodes, etc.). Power losses in two control mode have different characteristics. It is clear that the converter in PWM operation cannot meet the requirements in...