Transistor "Base" control?
I may be stupid, but I have a very basic question about transistors. What controls the "Base" input? Where does this signal come from? I feel like such an idiot for asking.
Update:I might not have been clear. In an IGBT inverter circuit, where does the "base" signal come from?
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The base signal comes from a driving circuit that is some type of oscillator or multivibrator.
The base signal usually consists of the biasing voltage and the input that you want to amplify. If a transistor is used as a switch the input signal will turn it on and the lack of input signal will insure that it is off.
In the IGBT inverter circuit the feedback voltage comes from the inverter transformer, usually a separate winding. It could even come from a special IC chip that controls the output voltage and frequency. This allows the circuit to convert a dc voltage to an ac voltage of 60 hertz.