Transistorized static inverters

Claim 2

A static inverter for converting direct voltage into alternating voltage, comprising: a. a first and a second switching transistors each having emitter, collector and base, b. a first resistor and a second resistor respectively connecting the bases of said first and second transistors to a junction point and operating as current generator for said transistors, c. a source of DC voltage connected to said junction point, d. inductance means inductively coupling said bases, e. first and second coils inductively coupled to said inductance means and respectively connecting the collectors of said transistors to said junction, f. capacitor means connecting said collectors, said capacitor means, coils and inductance means constituting a frequency pilot circuit for said transistors, g. first and second switching rectifier means connecting the collectors of said transistors to ground for uncoupling said collectors, h. and at least one output transformer, each said transformer having a primary connected across said collectors and a secondary whose ends constitute terminals for connection of an output load.

Claim 3

An inverter according to claim 1, comprising self-inductance coil means connected in series between said junction and said source, said self-inductance coil means having an impedance high enough for impedance matching of the source and transistor circuit.

Claim 4

An inverter according to claim 1, further comprising power transistors connected to said switching transistors to be driven by said switching transistors, said primaries being connected across the collectors of said power transistors.

Claim 5

An inverter according to claim 1, wherein each said primary consists of two identical windings connected in series relation, electric conductor means connecting the common ends of said windings to said junction and respective rectifier means connecting said collectors to the remaining ends of said windings.

Claim 6

An inverter according to claim 4, further including attenuator means interposed on said conductor means.

Claim 7

A static inverter for converting direct voltage into alternating voltage, comprising: a. a first and a second switching transistors each having emitter, collector and base, b. a first resistor and a second resistor respectively connecting the bases of said first and second transistors to a junction point and operating as current generator for said transistors, c. a source of DC voltage connected to said junction point, via a series arrangement of a resistor and of self inductance coil means, d. inductance means inductively coupling said bases, e. first and second coils inductively coupled to said inductance means and respectively connecting the collectors of said transistors to said source, via said self inductance coil means, f. capacitor means connecting said collectors, said capacitor means, coils and inductance means constituting a frequency pilot circuit for said transistors, g. first and second switching rectifier means connecting the collectors of said transistors to ground for uncoupling said collectors, h. a capacitor having a first armature connected to said junction and another armature grounded, i. a winding inductively coupled to said inductance means and having a grounded mid terminal and end terminals, j. unidirectional conduction means connecting said end terminals to said first armature to form a voltage generator for said transistors, k. and at least one output transformer, each said transformer having a primary connected across said collectors and a secondary whose ends constitute terminals for connection of an output load.

Claim 8

A static inverter for converting direct voltage into alternating voltage, comprising: a. a first and a second switching transistors each having emitter, collector and base, b. a first resistor and a second resistor respectively connecting the bases of said first and second transistors to a junction point and operating as current generator for said transistors, c. a source of DC voltage connected to said junction point, via a series arrangement of a resistor and of self inductance coil means, d. inductance means inductively coupling said bases, e. first and second coils inductively coupled to said inductance means and respectively connecting the collectors of said transistors to said source, via said self inductance coil means, f. capacitor means connecting said collectors, said capacitor means, coils and inductance means constituting a frequency pilot circuit for said transistors, g. first and second switching rectifier means connecting the collectors of said transistors to ground for uncoupling said collectors, h. a capacitor having a first armature connected to said junction and another armature grounded, i. a winding inductively coupled to said inductance means and having a grounded mid terminal and end terminals, j. unidirectional conduction means connecting said end terminals to said first armature to form a voltage generator for said transistors, k. and at least one output transformer, each said transformer having a primary connected across said collectors and a secondary whose ends constitute terminals for connection of an output load.

Claim 9

A static inverter for operating a plurality of fluorescent lamps from a direct voltage current source, said inverter comprising: a. a first and a second switching transistors each having emitter, collector and base, b. a first resistor and a second resistor respectively connecting the bases of said first and second transistors to a junction point and operating as current generator for said transistors, c. self inductance coil means connected in series between said junction and said source, said self inductance coil means having an impedance high enough for impedance matching of the source and transistor circuit, d. inductance means inductively coupling said bases, e. first and second coils inductively coupled to said inductance means and each connecting the collector of a respective one of said transistors to said junction, f. capacitor means connecting said collectors, said capacitor means, coils and inductance means constituting a frequency pilot circuit for said transistors, g. first and second switching rectifier means connecting the collectors of said transistors to ground for uncoupling said collectors, h. and a plurality of output transformers each for operating a fluorescent lamp and each having a primary connected across said collectors and a secondary whose ends constitute terminals for connection of the fluorescent lamp.

Claim 10

A static inverter for operating a plurality of fluorescent lamps from a direct voltage current source, said inverter comprising: a. a first and a second switching transistors each having emitter, collector and base, b. a first resistor and a second resistor respectively connecting the bases of said first and second transistors to a junction point and operating as current generator for said transistors, c. self inductance coil means connected in series between said junction and said source, said self inductance coil means having an impedance high enough for impedance matching of the source and transistor circuit, d. inductance means inductively coupling said bases, e. first and second coils inductively coupled to said inductance means and each connecting the collector of a respective one of said transistors to said junction, f. capacitor means connecting said collectors, said capacitor means, coils and inductance means constituting a frequency pilot circuit for said transistors, g. first and second switching rectifier means connecting the collectors of said transistors to ground for uncoupling said collectors, h. and a plurality of output transformers each for operating a fluorescent lamp and each having a primary connected across said collectors and a secondary whose ends constitute terminals for connection of the fluorescent lamp.

Claim 11

A static inverter according to claim 7, further comprising: a supplemental resistor located between the common terminal of said first and second resistors and said junction point, supplemental capacitor means connecting said common terminal to ground, an auxiliary coil having a central grounded tap and inductively coupled with said inductance means and first and second coils, and unidirectional conduction means respectively connecting the ends of said auxiliary coil means to said common terminal, the above-mentioned elements being arranged and dimensioned for constituting an additional base current generator for said transistors, whereby an increased output AC current may be delivered.