Design Of High-efficiency Synchronous Four-switch DC-DC Boost Converter Based On Peak Current Mod

The power management chip converts rough,uncontrollable,and unstable power sources into precise,controllable,and stable power sources.Four Switch Buck Boost(FSBB),as an important boost and boost power management chip,is widely used in various electronic products and devices due to its advantages such as high energy conversion efficiency,wide input and output voltage range,and strong load capacity.However,currently,FSBB converters work under different load conditions,resulting in low conversion efficiency and room for further optimization of conversion efficiency.Firstly,by analyzing common FSBB loop control methods and combining them with actual design,this design selects the Pesk Current Mode(PCM)control method with relatively balanced performance.At the same time,in order to solve the problem of low system efficiency under light load current applications,this paper designs a PWM/PFM hybrid modulation method to reduce switch losses under light load.To achieve a wide input voltage range,the switching circuit operates at 3.3V in a 30 V control circuit,and a combination of charge pump and level shift circuit is used to achieve high-voltage conversion.Secondly,the factors affecting the efficiency of FSBB converters were analyzed and solutions were proposed.In order to design a voltage converter with a wide input and output range,a 30 V high-voltage power switch transistor is used,with parasitic diodes at the drain and source electrodes.Although the power transistor can avoid breakdown when a large instantaneous reverse current is generated in the circuit,when the power transistor is turned off,the diode reversely cuts off,and the junction capacitance inside the switch power transistor releases voltage,resulting in losses.In response to the losses in the switching circuit,This design utilizes a driving circuit with ZVS to further reduce switching losses and improve the conversion efficiency of the system.Once again,the overall circuit design was completed,using the Dongbu Hitek 0.18 um process to achieve the voltage regulator function of the switching power supply voltage converter.The voltage regulator function and performance of the FSBB were verified using the Virtuoso simulation platform.The results show that the FSBB converter designed in this article can achieve a wide input voltage range of 3.3V to 29 V,and can achieve a stable output of 2.8V to 29 V.According to the load situation,changing the operating frequency of the converter within 100 KHz to 1MHz can achieve the best conversion efficiency,with a maximum load capacity of 2A.According to the simulation results,the converter can achieve an energy conversion efficiency of 91.99% under typical application conditions.In addition to the key performance indicators mentioned above,other system indicators also meet the design requirements.