US3614664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Class c bridge oscillator
Assignee: Spacetac Inc
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Filing: 1970-07-08
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Granted: 1971-10-19
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Expires: 1990-07-08
Abstract
Abstract An oscillator bridge circuit including a pair of input terminals adapted for connection to a direct current source; two pairs of semiconductor devices, the two devices of each pair being connected with their load electrodes in series between the first and second input terminals and the junctions between each of the devices in a pair forming a pair of output terminals; a transformer having a primary winding connnected across the pair of output terminals and having feedback windings; four capacitors one connected across the load terminals of each of the devices; and means for applying biases between a load electrode and control electrode of each device for alternately switching on one device in each pair to apply the direct current source voltage across the pair of output terminals in alternating polarity; the means for applying including a control circuit which includes the one of the feedback windings connected to the control electrode of each of the devices for applying the voltage induced therein to alternately switch on the devices at the resonant frequency of the bridge circuit as substantially determined by the transformer primary inductance and the four capacitors.
Inventors
- 👤 Donald W Shute
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:17
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/20; H03B5/24
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
169 words
A sine wave oscillator bridge circuit comprising: a pair of input terminals adapted for connection to a current source; two pairs of semiconductor devices, the two devices of each pair being connected with their load electrodes in series between said first and second input terminals, and the junctions between each pair of devices forming a pair of output terminals; a transformer having a primary winding connected across the pair of output terminals and having feedback windings; four capacitors one connected across the load terminals of each of said devices; and means for applying biases between a load electrode and control electrode of each device for alternately switching on one device in each pair to apply the direct current source voltage across the pair of output terminals with alternating polarity; said means for applying including a control circuit including said feedback windings, connected to the control electrodes of said devices, for applying the voltage induced therein to alternately switch on said devices at the resonant frequency of said bridge circuit.
Claim 2
Dependent Claim
169 words
A sine wave oscillator bridge circuit comprising: a pair of input terminals adapted for connection to a current source; two pairs of semiconductor devices, the two devices of each pair being connected with their load electrodes in series between said first and second input terminals, and the junctions between each pair of devices forming a pair of output terminals; a transformer having a primary winding connected across the pair of output terminals and having feedback windings; four capacitors one connected across the load terminals of each of said devices; and means for applying biases between a load electrode and control electrode of each device for alternately switching on one device in each pair to apply the direct current source voltage across the pair of output terminals with alternating polarity; said means for applying including a control circuit including said feedback windings, connected to the control electrodes of said devices, for applying the voltage induced therein to alternately switch on said devices at the resonant frequency of said bridge circuit.
Claim 3
Dependent Claim
12 words
The bridge circuit of claim 1 in which said devices are transistors.
Claim 4
Dependent Claim
22 words
The bridge circuit of claim 1 in which the two of said devices in each of said pairs are opposite conduction types.
Claim 5
Dependent Claim
23 words
The bridge circuit of claim 2 further including four diodes one connected between the emitter of each transistor and its associated input terminal.
Claim 6
Dependent Claim
46 words
The bridge circuit of claim 1 in which said means for applying biases includes capacitor means to provide a voltage, opposite in polarity to that applied by the feedback windings to switch on a device, for establishing the feedback voltage required to switch on a device.
Claim 7
Dependent Claim
17 words
The bridge circuit of claim 1 in which said devices are operated in a class C mode.
Claim 8
Dependent Claim
177 words
An oscillator circuit comprising a pair of input terminals adapted for connection to a current source; a pair of output terminals adapted for connection to a load; a pair of semiconductor devices having their load electrodes connected between one of said input terminals and respective ones of said output terminals; a center-tapped transformer connected between said output terminals with its center tap connected to the other of said input terminals and having feedback windings; two capacitors one connected across the load terminals of each of said devices; and means for applying biases between a load electrode and control electrode of each device for alternately switching on said devices to apply the direct current source voltage across the center tap and alternate ones of said output terminals; said means for applying including a control circuit including said feedback windings connected to the control electrode of said devices for applying the voltage induced therein to alternately switch on said devices at the resonant frequency of said circuit as substantially determined by said transformer primary inductance and said two capacitors.
Claim 9
Dependent Claim
177 words
An oscillator circuit comprising a pair of input terminals adapted for connection to a current source; a pair of output terminals adapted for connection to a load; a pair of semiconductor devices having their load electrodes connected between one of said input terminals and respective ones of said output terminals; a center-tapped transformer connected between said output terminals with its center tap connected to the other of said input terminals and having feedback windings; two capacitors one connected across the load terminals of each of said devices; and means for applying biases between a load electrode and control electrode of each device for alternately switching on said devices to apply the direct current source voltage across the center tap and alternate ones of said output terminals; said means for applying including a control circuit including said feedback windings connected to the control electrode of said devices for applying the voltage induced therein to alternately switch on said devices at the resonant frequency of said circuit as substantially determined by said transformer primary inductance and said two capacitors.
Claim 10
Dependent Claim
12 words
The oscillator circuit of claim 7 in which said devices are transistors.
Claim 11
Dependent Claim
23 words
The Oscillator circuit of claim 8 further including two diodes one connected between the emitter of each transistor and its associated input terminal.
Claim 12
Dependent Claim
46 words
The oscillator circuit of claim 7 in which said means for applying biases includes capacitor means to provide a voltage, opposite in polarity to that applied by the feedback windings to switch on a device, for establishing the feedback voltage required to switch on a device.
Claim 13
Dependent Claim
17 words
The oscillator circuit of claim 7 in which said devices are operated in a class C mode.
References Cited (Backward Citations)
US3305759A
Cited
US3317856A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-18 | 1975-04-19 | 1975-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-18 | 1979-04-19 | 1979-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-18 | 1983-04-19 | 1983-10-19 | $7700.00 | Window Closed / Lapsed |