Many power inverters use SPWM to drive a MOSFET bridge and transformer output. I have been (slowly) piecing together the knowledge to build a homemade 3-5 kW inverter. The similarities to a class D amp are many, so I wanted ask you amp guys a couple of questions.
The SPWM and feedback control are easy. I have that pretty much perfected for my purposes. An Arduino Nano has more than enough power to manage all that and then some. So my remaining focus is on the power output stage. It will handle better than 200 amps in the continuous maximum, and much more for very small transients.
I have so far built an isolated power supply for the high side FET drive and the entire H-bridge. I have attached a diagram of 1/4 of the bridge. The rest are the same basic totem pole configuration, except the low side doesn't have an isolated power supply. The switch in the diagram represents all the upstream controls. The 1 ohm resistor represents a generic load. There are actually 4 FETs in each 1/4 bridge, each with their own gate resistor and diode. A single RC snubber serves each individual quarter.
Please critique.
The SPWM and feedback control are easy. I have that pretty much perfected for my purposes. An Arduino Nano has more than enough power to manage all that and then some. So my remaining focus is on the power output stage. It will handle better than 200 amps in the continuous maximum, and much more for very small transients.
I have so far built an isolated power supply for the high side FET drive and the entire H-bridge. I have attached a diagram of 1/4 of the bridge. The rest are the same basic totem pole configuration, except the low side doesn't have an isolated power supply. The switch in the diagram represents all the upstream controls. The 1 ohm resistor represents a generic load. There are actually 4 FETs in each 1/4 bridge, each with their own gate resistor and diode. A single RC snubber serves each individual quarter.
Please critique.
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