If you want constant current, then ohms law tells us for a given load(resistance) we can solve for voltage. So, you'll need to be able to vary your voltage in order to keep the current constant.

Because your project is AC, what current are we talking about? If your load is resistive you don't need to worry about the reactive component, if the load is reactive then you'll need to take this into account. Also, since this is AC, you must talk in terms of 'constant RMS voltage' rather than 'constant voltage' which implies DC.


One would think controlling the inverter would be the easiest way to control your voltage (it is most likely doing this anyway) rather than using phase control SCRs after the fact. Remember that using phase control doesn't control the voltage - it controls the energy put into the circuit. However, this ends up solving to a given RMS voltage.

Please don't use abbreviations like 'u' and 'r' - this is a professional forum so please use 'you' and 'are'. Remember you're not sending SMS to your friend here. You're communicating to the outside world and you're judged on this.