Patent US4318170A successfully refreshed from Google Patents.
US4318170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power inverter oscillator circuit
Assignee: Individual
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Filing: 1981-01-12
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Granted: 1982-03-02
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Expires: 2001-01-12
Abstract
Abstract A power inverter oscillator circuit has an output transformer with a primary winding, coupled in parallel with a capacitor, and the opposite ends of which are connected to the respective emitters of a PNP and a NPN transistors. The collector of the NPN transistor is coupled to the positive terminal and the collector of the PNP transistor is coupled to a negative terminal. In addition, a switching transformer is provided having a primary coil coupled at one end to one terminal and at the other end to the emitter of the transistor which is coupled to the other terminal. The switching transformer has two secondary coils or windings wherein one of the secondary coils is coupled between one terminal and the base of the transistor whose collector is coupled to the other terminal and the other secondary coil is coupled between the base of the other transistor and the remaining terminal.
Inventors
- 👤 Rolando V. Cabalfin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:44
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537; H02M7/5383; H02M7/53832; H02M7/53835; Y; Y10; Y10S; Y10S315/00; Y10S315/05; Y10S315/07
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
177 words
A DC to AC power inverter circuit comprising: a positive charged terminal and a negative charged terminal; a first transformer having a primary coil and a secondary coil; a capacitor coupled in parallel with said primary coil; a PNP transistor and a NPN transistor each having an emitter, a collector and a base; said both transistors and said primary coil form a series circuit coupled across said terminals; each one of said transistors being coupled to a respective end of said primary coil and said transistors being coupled to a respective one of said terminals to form a series circuit; a second transformer having a primary coil and a first and a second secondary coils; said first secondary coil being coupled between the base of said PNP transistor and said positive terminal; said second secondary coil being coupled between the base of said NPN transistor and said negative terminal; and said primary coil of said second transformer being coupled between the emitter of one of the transistors and said terminal which is coupled to the other transistor.
Claim 2
Dependent Claim
177 words
A DC to AC power inverter circuit comprising: a positive charged terminal and a negative charged terminal; a first transformer having a primary coil and a secondary coil; a capacitor coupled in parallel with said primary coil; a PNP transistor and a NPN transistor each having an emitter, a collector and a base; said both transistors and said primary coil form a series circuit coupled across said terminals; each one of said transistors being coupled to a respective end of said primary coil and said transistors being coupled to a respective one of said terminals to form a series circuit; a second transformer having a primary coil and a first and a second secondary coils; said first secondary coil being coupled between the base of said PNP transistor and said positive terminal; said second secondary coil being coupled between the base of said NPN transistor and said negative terminal; and said primary coil of said second transformer being coupled between the emitter of one of the transistors and said terminal which is coupled to the other transistor.
Claim 3
Dependent Claim
96 words
The inverter circuit of claim one wherein: the respective end of said primary coil of said first transformer being coupled to the emitter of one of said respective transistors; said collector of said NPN transistor being coupled to said positive terminal; said collector of said PNP transistor being coupled to said negative terminal; said first secondary coil of said second transformer being coupled between the base of said PNP transistor and said positive terminal; and said second secondary coil of said second transformer being coupled to the base of said NPN transistor and said negative terminal.
Claim 4
Dependent Claim
27 words
The inverter circuit of claim two wherein: said primary coil of said second transformer being coupled between the emitter of said PNP transistor and said positive terminal.
References Cited (Backward Citations)
US3008068A
Cited
US3703677A
Cited
US3662249A
Cited
US3602839A
Cited
US3818312A
Cited
US4194238A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-03-01 | 1985-08-31 | 1986-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-01 | 1989-08-31 | 1990-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-01 | 1993-08-31 | 1994-03-02 | $7700.00 | Window Closed / Lapsed |