Research On High Boost Fuel Cell Driving Circuit

With the progress of social science and technology,people have realized that excessive exploitation of natural resources,has caused environmental pollution and natural ecological damage,so the new energy technology has been more and more attention,they have gradually replaced the non-renewable coal mines,Natural gas,oil and other traditional energy,with practical,convenient,clean,simple,safe,high power advantages;and fuel cell internal electrochemical reaction of chemical energy into electricity,we only need to continue to provide reactants,with the reaction product It can solve the environmental protection,energy saving and emission reduction two issues,with its clean,safe,convenient,high power,environmental protection,flexible configuration and other characteristics of the water and fuel cell can be the output of electricity,People are widely developed,fit the"low-carbon environmental protection" theme requirements.So it is widely used in communications,defense,transportation and other fields.But the fuel cell itself is superimposed by the film,each piece of the chip voltage is not high,so how to increase the fuel cell output voltage is a problem.DC-DC boost converter can effectively solve the output voltage is small and unstable,we can access the end of the DC-DC step-up converter,the terminal output of the unstable low voltage to a stable value of the larger Of the voltage,and then access the power supply system or power grid use.Therefore,the study of DC-DC boost converter is very meaningful.Based on the original Boost circuit,the switching inductance unit,switched capacitor unit and voltage lifting unit are analyzed.Their working principle and working characteristics are analyzed.Then,the topology of three new Boost circuits is combined and analyzed.The principle of operation,steady-state characteristics,the characteristics of the DCM model,but also small-signal analysis of the new converter,derived transfer function.Using the PSIM software simulation experiment,it is concluded that the new Boost converter has increased the voltage gain compared with the past,but also reduces the voltage stress of the switch and the diode and reduces the conduction loss of the diode.In addition,the converter presented in this paper has the advantage that the input current is continuous and the output voltage ripple is small.Finally,with the AD software system for the PCB board,set up three power of 20W prototype,access to DC power with oscilloscope simulation,through the experimental results verify the correctness of the simulation analysis.