PHASE DIFFERENCE CONTROL CIRCUIT FOR INDUCTION FURNACE POWER SUPPLY

摘要

A control system for power delivered to an inductive load includes automatic control with a manual override for emergency situations. The system includes means for monitoring the power delivered to the load and means for varying the power delivered to the induction load by controlling the phase difference between voltage and current delivered to the load. Feedback means automatically control the phase difference between voltage and current in response to the measured power delivered to the load. Means are further provided for introducing an external signal into the feedback means, whereby the external signal supersedes the automatic control of the power delivered to the load.