US3573494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential transformer demodulating circuit
Assignee: AUTOMATIC TIMING & CONTROLS COMPANY Inc
•
Filing: 1968-01-12
•
Granted: 1971-04-06
•
Expires: 1988-01-12
Abstract
Abstract A demodulating circuit is disposed in series in the secondary winding circuit of a differential transformer. The demodulation circuit has an auxiliary winding magnetically coupled to the primary winding and the ends of the auxiliary winding are coupled to two electrodes of a solid-state device which also has two emitters. The two emitters of the device are connected in series with the secondary winding of the transformer and with a smoothing network for the demodulated AC voltage.
Inventors
- 👤 Grover K Houpt
- 👤 Edward T Thomson
- 👤 Joseph A Kihm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:38
CPC Classifications
H; H03; H03D; H03D1/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
162 words
A demodulating circuit comprising: a. a differential transformer having: 1. a primary winding adapted to be coupled to a source of a signal having an AC component and producing an electromagnetic wave in response thereto; 2. a secondary winding disposed to be threaded by said electromagnetic wave whereupon a voltage is induced therein whose amplitude and phase are adapted to be varied in response to modification in the magnetic coupling of said primary to said secondary; b. a solid-state switching circuit including at least one transistor and having at least three terminals, a first and a second of said terminals being in series with said secondary winding; c. a third inductive winding disposed to be threaded by said electromagnetic wave whereupon a voltage is induced therein having substantially unchanging phase, said third winding being coupled to said switching circuit via at least a third terminal thereof, said unchanging phase voltage enabling conduction of said switching circuit between said first and second terminals.
Claim 2
Dependent Claim
162 words
A demodulating circuit comprising: a. a differential transformer having: 1. a primary winding adapted to be coupled to a source of a signal having an AC component and producing an electromagnetic wave in response thereto; 2. a secondary winding disposed to be threaded by said electromagnetic wave whereupon a voltage is induced therein whose amplitude and phase are adapted to be varied in response to modification in the magnetic coupling of said primary to said secondary; b. a solid-state switching circuit including at least one transistor and having at least three terminals, a first and a second of said terminals being in series with said secondary winding; c. a third inductive winding disposed to be threaded by said electromagnetic wave whereupon a voltage is induced therein having substantially unchanging phase, said third winding being coupled to said switching circuit via at least a third terminal thereof, said unchanging phase voltage enabling conduction of said switching circuit between said first and second terminals.
Claim 3
Dependent Claim
126 words
a secondary winding disposed to be threaded by said electromagnetic wave whereupon a voltage is induced therein whose amplitude and phase are adapted to be varied in response to modification in the magnetic coupling of said primary to said secondary; b. a solid-state switching circuit including at least one transistor and having at least three terminals, a first and a second of said terminals being in series with said secondary winding; c. a third inductive winding disposed to be threaded by said electromagnetic wave whereupon a voltage is induced therein having substantially unchanging phase, said third winding being coupled to said switching circuit via at least a third terminal thereof, said unchanging phase voltage enabling conduction of said switching circuit between said first and second terminals.
Claim 4
Dependent Claim
126 words
a secondary winding disposed to be threaded by said electromagnetic wave whereupon a voltage is induced therein whose amplitude and phase are adapted to be varied in response to modification in the magnetic coupling of said primary to said secondary; b. a solid-state switching circuit including at least one transistor and having at least three terminals, a first and a second of said terminals being in series with said secondary winding; c. a third inductive winding disposed to be threaded by said electromagnetic wave whereupon a voltage is induced therein having substantially unchanging phase, said third winding being coupled to said switching circuit via at least a third terminal thereof, said unchanging phase voltage enabling conduction of said switching circuit between said first and second terminals.
Claim 5
Dependent Claim
36 words
The demodulating circuit according to claim 1, with the addition of a filter circuit coupled to said solid state circuit and to said secondary winding for removing ripple from the signal demodulated by said switching circuit.
Claim 6
Dependent Claim
48 words
The demodulating circuit according to claim 1, wherein said secondary winding has two sections disposed in voltage-bucking relation, and wherein said transistor is a dual-emitter transistor whose emitters are connected in series with said secondary winding sections and whose collector and base are coupled to said third winding.
Claim 7
Dependent Claim
33 words
The demodulating circuit according to claim 3, wherein said third winding is in two sections and each of said sections is disposed in proximity to one of the sections of said secondary winding.
Claim 8
Dependent Claim
18 words
The circuit according to claim 1, wherein said primary and secondary windings are not connected to one another.
Claim 9
Dependent Claim
16 words
The circuit according to claim 1, wherein said thirD winding is coaxial with said first winding.
Claim 10
Dependent Claim
16 words
The circuit according to claim 1, wherein said third winding is wound around said secondary winding.
Claim 11
Dependent Claim
16 words
The circuit according to claim 1, wherein said primary winding is disposed between said secondary windings.
References Cited (Backward Citations)
US2953738A
Cited
US2897379A
Cited
US3042872A
Cited
US3225289A
Cited
US3210746A
Cited
US3456132A
Cited
US3458798A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |