Actually, H-Bridges can be made with all low side Metal Oxide Semiconductor FETs. This being that N channel fets can handle much more current than the high side fets.
Also, there are more than a few ways to make an H-Bridge work. The pair of low side and high side MOSFETS are just one of them, this being that only 1 signal comming in will only activate FETS that are diagonal to one another. Reffering to the classic H formation on an H Bridge. This method is easy to make, and prevents shoot thru…
Method 2 uses only N channel fets, but requires an inverted MOSFET driver to drive each Side, so driver 1 controls the upper left and lower left, while driver 2 controls upper right and lower right. This also prevents shoot thru of current.
Many more ways to make an H bridge.
Signals of 1 - 2ms enters on one end, with 1.5ms being neutral. The other end where the motor is connected to, has a duty cycle that varies. going from low frequencies such as 20hz to 40Khz. varies greatly, most applications, a frequency of 6khz is about just in the middle. I read that from somewhere, but can’t source it.
As for the polarity changes, you can make the microcontroller do that for you. Make an H bridge with a pair of MOSFET Drivers connected to the Gates on the mosfets. then have your digital output pull up or pull down the inputs on the MOSFET Drivers. The mosfet drivers are used because of the low gate resistance on the MOSFETs them selves. Having low resistance when a high current prescence at the channel makes the gate hard to open. So by using a driver, you can dump high currents at the gate at high frequencies to allow the channel to flow. If you need high duty cycles, you will have to load your routine in the user_routine_fast.c file. And go from there.
You can start experimenting with a bread board, and single mosfets first. after you know the fundementals, you can beef up and parallel your MOSFETS to handle currents as high as 80 amps steady loads or more.
As far as I know, the Victors use FETS that are about 65Amps on each MOSFET on a steady load, but be careful, because the power dissapation can be around 40 -80W each, and the pakage is only about a cm^2 area if you attach a heat sink.
Those victors use 12 fets, 3 per quadrant of the H bridge. So it would be able to handle high current loads for longer periods of time. They were able to make the duty cycle efficient enought that the fets dont requre added heat sinks.
International Rectifier makes MOSFETS with various pakage types, the ones used on the Victors are pakage: TO-220
Microchip.com makes the MOSFET drivers, other do too…Anyways, look for a pdf document on the website: “Mosfet Driver guide” or something along the line, it helps you select the right MOSFET drivers for the right type of MOSFETs…
GL with your experiments!