US4070701A — Inverter power supply

Claim 1

Independent Claim 231 words

A high frequency inverter power supply for operation from a single phase low frequency a.c. power source comprising: a full wave rectifier section including input terminals adapted to be connected to said a.c. power source and first and second oppositely poled output terminals providing full wave rectified substantially unfiltered pulsating d.c. power at said output terminals; a high frequency inverter section having an operating frequency substantially higher than said a.c. frequency, said high frequency inverter section connected to said first and second oppositely poled output terminals, said high frequency inverter section including high frequency transformer means having a primary winding and a secondary winding, and controllable solid state switching means electrically connected to said oppositely poled output terminals and to said primary winding; reactive means having a high impedance at said low a.c. frequency and a low impedance at said inverter operating frequency, said reactive means connected to said oppositely poled output terminals providing a low impedance, high frequency path thereacross, said reactive means providing substantially no filtering or power storage at said low a.c. frequency; control means operatively associated with said controllable solid state switching means for providing alternate conduction in said primary winding at said operating frequency whereby a waveform is produced in said secondary winding characterized by a first frequency equal to said high operating frequency amplitude modulated by a second frequency equal to said low a.c. frequency.

Claim 2

Dependent Claim 231 words

A high frequency inverter power supply for operation from a single phase low frequency a.c. power source comprising: a full wave rectifier section including input terminals adapted to be connected to said a.c. power source and first and second oppositely poled output terminals providing full wave rectified substantially unfiltered pulsating d.c. power at said output terminals; a high frequency inverter section having an operating frequency substantially higher than said a.c. frequency, said high frequency inverter section connected to said first and second oppositely poled output terminals, said high frequency inverter section including high frequency transformer means having a primary winding and a secondary winding, and controllable solid state switching means electrically connected to said oppositely poled output terminals and to said primary winding; reactive means having a high impedance at said low a.c. frequency and a low impedance at said inverter operating frequency, said reactive means connected to said oppositely poled output terminals providing a low impedance, high frequency path thereacross, said reactive means providing substantially no filtering or power storage at said low a.c. frequency; control means operatively associated with said controllable solid state switching means for providing alternate conduction in said primary winding at said operating frequency whereby a waveform is produced in said secondary winding characterized by a first frequency equal to said high operating frequency amplitude modulated by a second frequency equal to said low a.c. frequency.

Claim 3

Dependent Claim 51 words

The high frequency inverter power supply of claim 1 wherein said control means further comprises sensor means responsive to selected transformer parameters and generating an output signal proportional thereto, and means responsive to the output of said sensor means operative to vary the duty cycle of said high frequency inverter section.

Claim 4

Dependent Claim 20 words

The high frequency inverter of claim 2 wherein said selected transformer parameters comprise the total current flowing in said primary.

Claim 5

Dependent Claim 19 words

The high frequency inverter of claim 2 wherein said selected transformer parameters comprise the instantaneous flux in said transformer.

Claim 6

Dependent Claim 20 words

The high frequency inverter of claim 3 wherein said selected transformer parameters further comprise the instantaneous flux in said transformer.

Claim 7

Dependent Claim 37 words

The high frequency inverter of claim 2 wherein said control means further includes low power DC supply means providing a source of substantially pure DC for maintaining continuous instantaneous control over said controllable solid state switching means.

Claim 8

Dependent Claim 45 words

The high frequency inverter of claim 6 wherein said control means further includes switch means controlling the application of AC power to said full wave rectifier means, providing AC power to said full wave rectifier means only when said control means has become fully operative.

Claim 9

Dependent Claim 24 words

The high frequency inverter of claim 1 further comprising rectifier means operatively associated with said secondary winding to produce an output DC waveform therefrom.

Claim 10

Dependent Claim 47 words

The high frequency inverter of claim 8 further including filter means connected to said secondary winding operative to smooth the high frequency waveform so that a waveform is produced characterized by a varying DC level which substantially corresponds to the output of said full wave rectifier means.

Claim 11

Dependent Claim 24 words

The high frequency inverter of claim 5 further comprising rectifier means operatively associated with said secondary winding to produce an output d.c. waveform therefrom.

Claim 12

Dependent Claim 45 words

The high frequency inverter of claim 10 further including filter means connected to said secondary winding operative to smooth the high frequency waveform and provide an output characterized by a varying d.c. level which substantially corresponds to the output of said full wave rectifier means.

Claim 13

Dependent Claim 63 words

The high frequency inverter of claim 1 wherein said solid state switching means comprise transistors having base, collector and emitter electrodes, said collector electrodes and said emitter electrodes operatively connected with said primary winding and with said output terminals of said full wave rectifier means to provide alternating current in said primary winding in response to control signals applied to said base electrodes.

Claim 14

Dependent Claim 69 words

The high frequency inverter of claim 12 wherein said primary winding comprises a center tapped winding having first and second ends, said center tap connected to one of said oppositely poled output terminals, said first end connected to the collector of one of said transistors, said second end connected to the collector of said other transistor, and said emitters connected to the other of said oppositely poled output terminals.

Claim 15

Dependent Claim 63 words

The high frequency inverter of claim 7 wherein said solid state switching means comprise transistors having base, collector and emitter electrodes, said collector electrodes and said emitter electrodes operatively connected with said primary winding and with said output terminals of said full wave rectifier means to provide alternating current in said primary winding in response to control signals applied to said base electrodes.

Claim 16

Dependent Claim 69 words

The high frequency inverter of claim 14 wherein said primary winding comprises a center tapped winding having first and second ends, said center tap connected to one of said oppositely poled output terminals, said first end connected to the collector of one of said transistors, said second end connected to the collector of said other transistor, and said emitters connected to the other of said oppositely poled output terminals.

Claim 17

Dependent Claim 98 words

The high frequency inverter of claim 7 wherein said low power d.c. supply means comprises rectifier means adapted to be connected to said source of a.c. power, filter means for providing substantially pure d.c. power at the output thereof, low power, high frequency inverter means including transformer means and switching means operatively associated therewith, and a plurality of secondary windings on said transformer means, providing selected high frequency a.c. output voltages, second rectifier means operatively associated with at least one of said plurality of secondary windings for providing selected d.c. output voltages for operation of said control means.

Claim 18

Dependent Claim 63 words

The high frequency inverter of claim 4 wherein said solid state switching means comprise transistors having base, collector and emitter electrodes, said collector electrodes and said emitter electrodes operatively connected with said primary winding and with said output terminals of said full wave rectifier means to provide alternating current in said primary winding in response to control signals applied to said base electrodes.

Claim 19

Dependent Claim 69 words

The high frequency inverter of claim 4 wherein said primary winding comprises a center tapped winding having first and second ends, said center tap connected to one of said oppositely poled output terminals, said first end connected to the collector of one of said transistors, said second end connected to the collector of said other transistor, and said emitters connected to the other of said oppositely poled output terminals.

Claim 20

Dependent Claim 220 words

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.

Claim 21

Dependent Claim 220 words

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.

Claim 22

Dependent Claim 19 words

The battery charger of claim 19 wherein said selected circuit parameters comprise the total current flowing in said primary.

Claim 23

Dependent Claim 19 words

The battery charger of claim 18 wherein said selected circuit parameters further comprise the instantaneous flux in said transformer.

Claim 24

Dependent Claim 36 words

The battery charger of claim 21 wherein said control means further includes low power d.c. supply means providing a source of substantially pure d.c. for maintaining continuous instantaneous control over said controllable solid state switching means.

Claim 25

Dependent Claim 44 words

The battery charger of claim 22 wherein said control means further includes switch means controlling the application of a.c. power to said full wave rectifier means, providing a.c. power to said full wave rectifier means only when said control means has become fully operative.

Claim 26

Dependent Claim 62 words

The battery charger of claim 19 wherein said solid state switching means comprise transistors having base, collector and emitter electrodes, said collector electrodes and said emitter electrodes operatively connected with said primary winding and with said output terminals of said full wave rectifier means to provide alternating current in said primary winding in response to control signals applied to said base electrodes.

Claim 27

Dependent Claim 68 words

The battery charger of claim 22 wherein said primary winding comprises a center tapped winding having first and second ends, said center tap connected to one of said oppositely poled output terminals, said first end connected to the collector of one of said transistors, said second end connected to the collector of said other transistor, and said emitters connected to the other of said oppositely poled output terminals.

Claim 28

Dependent Claim 62 words

The battery charger of claim 23 wherein said solid state switching means comprise transistors having base, collector and emitter electrodes, said collector electrodes and said emitter electrodes operatively connected with said primary winding and with said output terminals of said full wave rectifier means to provide alternating current in said primary winding in response to control signals applied to said base electrodes.

Claim 29

Dependent Claim 68 words

The battery charger of claim 26 wherein said primary winding comprises a center tapped winding having first and second ends, said center tap connected to one of said oppositely poled output terminals, said first end connected to the collector of one of said transistors, said second end connected to the collector of said other transistor, and said emitters connected to the other of said oppositely poled output terminals.

Claim 30

Dependent Claim 92 words

The battery charger of claim 23 wherein said low power d.c. supply means comprises rectifier means adapted to be connected to said source of a.c. power, filter means for providing substantially pure d.c. power at the output thereof, low power, high frequency inverter means including transformer means and switching means operatively associated therewith, and a plurality of secondary windings on said transformer means, providing selected high frequency a.c. output voltages, second filter means operatively associated with said plurality of secondary windings providing selected d.c. output voltages for operation of said control means.

Claim 31

Dependent Claim 108 words

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.

Claim 32

Dependent Claim 108 words

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.

Claim 33

Dependent Claim 52 words

The battery charger of claim 29 wherein said d.c. electrical output is a composite waveform having low frequency component characterized by a frequency twice said low frequency single phase a.c. power source frequency, and a high frequency component characterized by a frequency twice the frequency of said high frequency inverter power supply.

Claim 34

Dependent Claim 134 words

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.

Claim 35

Dependent Claim 134 words

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.

Claim 36

Dependent Claim 50 words

The high frequency inverter battery charger of claim 19 wherein said control means further includes means responsive to the output voltage of said second rectifier means for disconnecting said first rectifier means from said a.c. power source whenever said output voltage of said secondary rectifier means exceeds a preselected value.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1981-01-23	1981-07-25	1982-01-24	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1985-01-23	1985-07-25	1986-01-24	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1989-01-23	1989-07-25	1990-01-24	$7700.00	Window Closed / Lapsed

Inverter power supply

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