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Never noticed the light bulb in that photo before. It is a simple solution. I like it. Do you have a relay to switch to mains when voltage has leveled out?
Right I use a large relay which bypasses the resistor (light bulb) after some fixed duration. I was thinking of implementing some sort of voltage detection system but I figured that that was completely unnecessary for achieving such a simple goal - no need for added complexity! So the system just uses a simple delay which the relay is triggered thereafter. Alternatively, a simple manual switch will suffice but you may run into instances where you might forget to switch it on/off. This is a similar principle of operation with my pre-charge board, but it also adds discharge capability. Otherwise I usually turn off main power to the coil (driver power still on), and run the coil for a few pulses to discharge the cap bank safely. For higher currents, contactors are usually used, but that's essentially another word for 'big relay'.
Registered Member #6038
Joined: Mon Aug 06 2012, 11:31AM
Location: Salado, TX
Posts: 248
Follow-up question after some testing. I decided to try the Capacitive Reactance option first. Using a 160uF cap in series with the Tesla DC bus cap I had about 75v across the cap. With Xc of 17ohms the current draw peaked at about 7 amps. So all was good, except when switching out the cap, the 20A breaker tripped. The 15A fuse never blew so I can only deduce the current rise is so sharp it trips the breaker and not the actual peak current. Do you think a larger capacitor would help or maybe an inductor in series if the current rise time is the problem? Thoughts?
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DRSSTC Capacitor Charging
