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US 4,051,413 AGranted
Transistorized static inverters
OwnerHenry J. L. Abadieinventor
Life of this patent
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Abstract
A static inverter comprises switching transistors, resistors connecting the bases of the transistors with a junction point connected to a source of DC voltage. The bases of the transistor are inductively coupled by inductance means coupled with coils connecting the collectors of the transistors to the junction. The inverter is adapted to operate a plurality of fluorescent lamps. Each lamp is in series with the secondary of a transformer whose primary is connected across the collectors of the transistors.
Claims8
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.
5 more elements
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.
8 more elements
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.
5 more elements
Dependencies are inferred from the claim text.