Inverter power supply

A high frequency inverter battery charger for operation from a low frequency single phase a.c. power source comprising

• first rectifier means, adapted to be connected to said a.c. power source, having an output providing full wave rectified pulsating d.c. power at first and second oppositely poled terminals thereof,
• a capacitor electrically connected between said first and second oppositely poled terminals characterized by an impedance which is high at said low frequency single phase a.c. power source frequency, and low at said high frequency inverter battery charger frequency, thereby providing a low impedance path in short circuit relationship with said first rectifier means for high frequencies, while having substantially no filtering effect on said full wave rectified d.c. power,
• high frequency transformer means having a primary winding and a secondary winding,
• controllable solid state switching means electrically connected to said first and second oppositely poled terminals, and to said primary winding for providing high frequency alternating current flow in said primary, whereby voltage high frequency alternating voltage will be induced in said secondary winding,
• control means responsive to selected circuit parameters for controlling the conduction of said solid state switching means, varying the ratio of conducting to non-conducting time to increase or decrease the output voltage,
• second rectifier means electrically connected to said secondary winding for providing a d.c. electrical output.

A battery charger for non-hazardous on site charging or recharging of a vehicular battery comprising,

• substantially rigid, non-conductive enclosure,
• high frequency inverter power supply means for contained within said enclosure for converting an a.c. electrical input to a d.c. electrical output while maintaining ohmic isolation between said input and said output, said inverter adapted to be connected to a source of low frequency single phase a.c. power and providing a substantially non-reactive load therefore,
• means connecting said d.c. electrical output to said vehicular battery through apertures in said enclosure,
• fan means mounted to said enclosure for providing dispersion of potentially explosive battery vapors generated during the charging process.

A control and power supply module for providing output signals suitable for the operation of a high power, high frequency inverter comprising

• rectifier means adapted to be connected to a source of low frequency a.c. power,
• filter means electrically connected to said rectifier means for providing substantially pure d.c. at a pair of output terminals,
• a switching inverter including transformer means having a primary winding and a plurality of secondary windings, and solid state switching means electrically connected to said transformer means and to said pair of output terminals,
• rectifier means electrically connected to said secondary windings for providing selected d.c. output signals therefrom,
• means operatively associated with said secondary windings sensing the presence of signals thereat and providing a turn-on signal to said high power, high frequency inverter when secondary signals are present.