Direct current to alternating current electronic inverter with overload and short-circuit protection circuitry

An electronic inverter for converting direct current electrical energy into alternating current electrical energy comprising.

• A. an oscillator having a frequency equal to an integral multiple of the desired alternating current frequency;
• B. a divider circuit connected to the output of the oscillator for generating a pair of 180.degree. out of phase 50% duty cycle square waves;
• C. a push-pull amplifier connected to the 180.degree. out of phase square wave outputs of the divider circuit for amplifying these outputs into a high-current square wave;
• said push-pull amplifier incorporating:
• 1. two sets of bi-directional current flow electronic power switches;
• and
• 2. overload protection means connected to said switches for terminating driving energy to the power switches are in an out of saturation condition;
• D. a ferro-resonant transformer connected to the high-current square wave output of the push-pull amplifier for generating a substantially sinusoidal electrical output;
• and
• E. a low-current switch for energizing the oscillator, divider circuit, and at least a portion of the push-pull amplifier whereby the inverter is activated when said switch is closed.

An electronic inverter for converting direct current electrical energy into alternating current electrical energy comprising:

• A. an oscillator having a frequency equal to an integral multiple of the desired alternating current frequency;
• B. a divider circuit connected to the output of the oscillator for generating a pair of 180.degree. out of phase 50% duty cycle square waves;
• C. a push-pull amplifier connected to the 180.degree. out of phase square wave outputs of the divider circuit for amplifying these outputs into a high-current square wave;
• said push-pull amplifier incorporating:
• 1. two sets of bi-directional current flow electronic power switches;
• 2. a pair of emitter follower transistors driving the two sets of electronic power switches, wherein the electrical energy supplying the collectors of these emitter follower transistors is substantially higher than the saturation collector voltage on the electronic power switches;
• whereby said power switches are insured of being placed into a deep saturation state during turn-on of the respective emitter follower transistors;
• and
• 3. overload protection means connected to said switches for terminating driving energy to the power switches when said power switches are in an out of saturation condition;
• and
• D. a ferro-resonant transformer connected to the high-current square wave output of the push-pull amplifier for generating a substantially sinusoidal electrical output.