In this video the minimal system comes together. Compensation is added to pin 9 to increase stability. The board is tested using a 40V power supply to simulate two 12V panels in series of a 24V system. Due to the low voltage 55V IRF3205 FET, the typical system would be 600W of panels in a 2S3P configuration. Maximum current would be under 15A. I used a 3 ohm resistor to simulate a heating element drawing 13A. Very close to a maximum expected from panels and enough to demonstrate realistic operation. Deadtime is increased on the board by changing a resistor. This creates arc interrupt, turning off current for a period of time to allow the arc to quench. Arc interrupt turns the heater off and that can lower efficiency at peak solar times. There are three solutions to this. Increase cycle time as long as possible so the FET turns off from the voltage dropping first. That can be by selecting a heater resistance somewhat lower than ideal. Total capacitance can also be increased to store more energy while in the off time. ALWAYS READ ALL COMMENTS. They include information that may have been left out of the video or changes.
In this video the minimal system comes together. Compensation is added to pin 9 to increase stability. The board is tested using a 40V power supply to simulate two 12V panels in series of a 24V system. Due to the low voltage 55V IRF3205 FET, the typical system would be 600W of panels in a 2S3P configuration. Maximum current would be under 15A. I used a 3 ohm resistor to simulate a heating element drawing 13A. Very close to a maximum expected from panels and enough to demonstrate realistic operation.
Deadtime is increased on the board by changing a resistor. This creates arc interrupt, turning off current for a period of time to allow the arc to quench. Arc interrupt turns the heater off and that can lower efficiency at peak solar times. There are three
solutions to this. Increase cycle time as long as possible so the FET turns off from the voltage dropping first. That can be by
selecting a heater resistance somewhat lower than ideal. Total capacitance can also be increased to store more energy while in the off time. ALWAYS READ ALL COMMENTS. They include information that may have been left out of the video or changes.
👍