The Design Of MEMS Micro Fuel Cell Power Management Chip

With the rapid development of science and technology in today’s society, therapid population growth, human demand for electronic products and new energysources is also increasing. The new energy directly used in electronic products hasbecome one of the main direct of development electronic products. The new energypower management system has very important influence onwhether the new energycan be directly applied for electronic equipment. So, the new energy powermanagement system has become one of the hot researching today. In this paper,apower management chiphas been designed andsimulated forpassive methanol fuelcell.The1×/1.33×/1.5×/2×adaptive charge pump module designed as the coremodule. It features a fuel cell with an input voltage changes, the modulecorresponding multiplier boost mode, the output voltage is maintained at a fi×edvalue, to the role of regulator output. The skip comparator module is designedtoreducing the loss of MOS switching in the internal charge pump. Chip operatingfrequency is the generated clock signal of the oscillator module,1MHz. Chip designby adding a lot of au×iliary modules, such as the bias circuit module, an erroramplifier module, the control mode module, bandgap reference voltage module,power module choice, has to achieve better operating characteristics. The powermanagement chip includes the following advantages: the low static powerconsumption, the big input voltage rangeof the fuel cell, the high power conversionefficiency, the small electromagnetic interference.Cadence simulation toolhas been used in software simulation e×periments with0.5μm CMOS process technology. Firstly, the overall framework of the sub-chippower management moduleshas been established, and each of sub-modules has beenresearched, designed, simulatedon transistor-level.Finally,the whole chip has beensimulated. Simulation results show that: the0mA~150mA load current changes, theinput voltage range of the fuel cells can be increasedto2.6V~5.5V; chip outputvoltage remains stable at5V output, the static power consumption of only0.3mW; data obtained by calculation, can be obtained with the input voltage increases, theincrease in multiplication mode, the power conversion efficiency decreases, but theconversion efficiency1.33×mode height than1.5×mode10%, indicating that themultiplication mode power conversion efficiency can be improved in multiplicationmode. Simulation results show that the design of the power management chipapplicable to passive methanol fuel cells in principle.