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A simple and reliable PWM inverter to generate sinusoidal wave of constant voltage and variable frequency is presented. In the control circuit of this inverter, amorphous cores are used to produce PWM wave. These cores have three kinds of windings, that is, the common windings, the bias winding and the output windings. The bias winding gives each core a different amount of ac mmf to decide the order...
A new PWM controller with simple structure is presented. This controller consists of a modified transistor-core multivibrator having a single saturable core and is capable of changing the oscillation frequency with ease by a low control voltage. Accordingly, if this controller is applied to a small DC power supply or a feedback element of the switching regulator, a considerable reduction of the number...
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