Selenia Spazio

Silvio Roccucci

A pulse-width-modulated inverter-converter for generating a direct current output from a direct current supply which utilizes a power inverter having smoothed trapezoidal waveform at the inverter output. A nonlinear inductive element, e.g. a reactor, is provided in series with the center tap of the primary winding of the power transformer which is connected to the power transistors of the inverter to allow storage in a capacitor upstream of this inductor of energy during the recovery times of the transistors.

PWM inverter with trapezoidal output

An oscillator circuit for generating a square wave output for space or terrestrial applications comprising a main oscillator and a saturable transformer forming the feedback loop of the power inverter. According to the invention, a synchronization circuit comprises transistors for shortcircuiting respective branches of the primary winding of this transformer upon detection of signal from differentiators connected to the main oscillator. Means connects a main limiting resistor to the center tap of the primary winding so that flux inversion is effected in the saturable transformer at the end of a power inverter recovery time.

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Rome, Italy

Silvio Roccucci