The Research On Composite Power Four-channel Bidirectional Buck /Boost Converter

With the Surge of the number of city cars,even if cities with no heavy industry are also faced with severe haze pollution.Composite power electric cars arises at the historic moment,and the cars have the advantages of energy conservation,emissions reduction and the basic facilities for reuse,overcoming the limit of range.The technology is takes the most market prospects in the current electric vehicle industry.Buck/Boost converter makes composite staggered parallel magnetic integration significantly,reducing the volume of power supply and quality. To achieve the optimization.of power performance,this paper puts forward the combination of four staggered parallel magnetic integrated Buck/Boost converter,which has multiple channels and can reduce the current ripple effectively,improving the response speed of the system.In order to improve stability of the system,reduce the ripple of the converter and improve the dynamic response speed,the PWM control switch tube has been a research focus in the field of transformers.In order to overcome the characteristic of frequency fluctuation for the traditional hysteresis control switch,this paper also puts forward a fast hysteresis current control method based on capacitance charging and discharging (Capacitor charge and discharge fast hysteresis CCDFH).The control method of circuit structure is simple,and can achieve good dynamic response (similar to the PID) and has perfect static response,effective response to input and load changes,simplifying control circuit devices,reducing the cost of the device can control the peak inductance current and eventually optimize the loss of inductors and switch,and quasi constant frequency characteristics,the design the correctness of the theoretical analysis is verified by the experimental prototype.