Calculating MOSFET Rating
Calculating MOSFET for an inverter is actually quite simple. One has to take into account the fact that MOSFETs are nothing but electronic switches, and must be rated just like we rate our mechanical switches. Meaning the MOSFET’s voltage and current ratings must be adequately selected so that even at the maximum specified load, the MOSFET working is well within its breakdown level.
To ensure the above condition, you can refer to the datasheet of the mosfet and check the Drain-Source Voltage and the Continuous Drain Current parameters of the device, such that both these values are well above the load’s maximum consumption values, or are selected with appreciable margins.
Suppose if the load is rated at 200 watts, then dividing this with the battery voltage 12V we get 16 amps. Therefore the MOSFET could be selected with voltage ratings anywhere between 24V to 36V as its Drain-Source Voltage (Vdss), and 24 amp to 30 amp as its Continuous Drain Current (Id).
Take the example of the MOSFET in the image above, here the maximum tolerable voltage Vdss of the specified MOSFET is 75V, and maximum tolerable current Id is 209 amps, when operated with proper heatsink. It means this MOSFET can be safely used for all applications where the load wattage is not more than 14000 watts.
This takes care of the MOSFETs, and ensures a perfect working of the devices even at full load conditions, but do not forget to mount them on appropriately dimensioned heatsinks.
After procuring all the necessary components as explained above, it would be important to get them checked for compatibility with one another.
Only the battery, which is one the most crucial member, hopefully will not require any prior checking, because the printed rating and the charged voltage conditions should be sufficient to prove its reliability. It is assumed here that the condition of the battery is good and it’s relatively new and “healthy.”
IRFP2907 MOSFET. Datasheet pdf. Equivalent
Type Designator: IRFP2907
Type of Transistor: MOSFET
Type of Control Channel: N -Channel
Maximum Power Dissipation (Pd): 330 W
Maximum Drain-Source Voltage |Vds|: 75 V
Maximum Gate-Source Voltage |Vgs|: 20 V
Maximum Drain Current |Id|: 209 A
Total Gate Charge (Qg): 410 nC
Maximum Drain-Source On-State Resistance (Rds): 0.0045 Ohm
Package: TO247AC
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