Patent US3735276A successfully refreshed from Google Patents.
US3735276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oscillator system
Assignee: S C J ASSOCIATES Inc
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Filing: 1972-04-12
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Granted: 1973-05-22
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Expires: 1992-04-12
Abstract
Abstract A current controlled oscillator system is described which is isolated electrically from external systems and sources. The system includes a voltage controlled oscillator to which a control voltage related to the input control current is supplied for varying its frequency. A pair of alternating current channels respond to the oscillator signals and produce control signals which preset the frequency limits over which the oscillator frequency may be varied and to control the oscillator frequency so as to vary linearly with the input control current within such limits. The channels separately have a peak detector and a discriminator which develop control signals of opposite polarity from limited oscillator output signals. Isolation is provided both from control devices and from external power supplies by coupling these devices and power supplies to the system through transformers; the external power supply being coupled through a transformer which is part of a DC to AC inverter connected to the external supply.
Inventors
- 👤 R Apolant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:05
CPC Classifications
H; H03; H03C; H03C3/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
171 words
A system for providing an output signal having a frequency related to the amplitude of an input signal, which system comprises a. a variable frequency oscillator for providing said output signal, b. means responsive to said input signal amplitude for applying a control signal to said oscillator to vary the frequency of said oscillator in accordance with the amplitude of said control signal, c. means responsive to the signal produced by said oscillator having first and second alternating current channels respectively for developing first and second signals of opposite polarity, said first signal varying in amplitude in accordance with the frequency of said oscillator signal and said second signal being of certain amplitude regardless of variations in oscillator frequency, said last named means including means for limiting the level of said signal produced by said oscillator to provide as inputs to at least said second channel a signal which does not exceed a predetermined amplitude, and d. means for applying said first and second signals to said control signal applying means.
Claim 2
Independent Claim
171 words
A system for providing an output signal having a frequency related to the amplitude of an input signal, which system comprises a. a variable frequency oscillator for providing said output signal, b. means responsive to said input signal amplitude for applying a control signal to said oscillator to vary the frequency of said oscillator in accordance with the amplitude of said control signal, c. means responsive to the signal produced by said oscillator having first and second alternating current channels respectively for developing first and second signals of opposite polarity, said first signal varying in amplitude in accordance with the frequency of said oscillator signal and said second signal being of certain amplitude regardless of variations in oscillator frequency, said last named means including means for limiting the level of said signal produced by said oscillator to provide as inputs to at least said second channel a signal which does not exceed a predetermined amplitude, and d. means for applying said first and second signals to said control signal applying means.
Claim 3
Dependent Claim
51 words
The invention as set forth in claim 1 wherein said limiting means includes a bridge rectifier at the input ends thereof, one of said pair of channels being connected across a diagonal of said bridge and the other of said pair of channels being connected across one side of said bridge.
Claim 4
Dependent Claim
51 words
The invention as set forth in claim 2 wherein a zener diode is connected across a diagonal of said bridge and one end of which is connected with the end of said one side of said bridge across which the input of said other of said pair of channels is connected.
Claim 5
Dependent Claim
25 words
The invention as set forth in claim 3 including a frequency discriminator and a peak detector respectively connected in said first and said second channels.
Claim 6
Dependent Claim
77 words
The invention as set forth in claim 1 including means for isolating said system from a source of direct current operating potential therefor, said isolating means including means connected to said source for converting said operating potential into alternating current, a transformer having a primary winding connected to said converting means and a secondary winding isolated therefrom, and means connected to said secondary winding for converting said alternating current into direct current operating potential for said system.
Claim 7
Dependent Claim
64 words
The invention as set forth in claim 5 including between said limiting means and the input to at least one of said channels a potentiometer, a transformer having a primary winding connected in series between said limiting means and said one channel input and a secondary winding across which said potentiometer is connected, said transformer providing isolation between said potentiometer and said one channel.
Claim 8
Dependent Claim
35 words
The invention as set forth in claim 5 wherein said system has an internal ground and wherein said potentiometer, said source and said direct current to alternating current converting means has a common external ground.
Claim 9
Dependent Claim
198 words
The invention as set forth in claim 1 wherein said oscillator is a voltage controlled oscillator, said control signal applying means comprises an amplifier having an input for said input signal and said first and second signals, and wherein said system has an internal ground and an external ground, a power supply including a DC to AC converter connected to said external ground and an AC to DC converter connected to said internal ground, said DC TO AC converter having an AC output and said AC to DC converter having an AC input, said AC output and AC input being transformer coupled to each other, and wherein a first and a second transformer each having a separate potentiometer connected across one of the windings thereof, said one winding being connected to said external ground, said first and second transformer eAch having a second winding respectively connected in series between said limiting means and said first and said second channel, and wherein said first channel includes a peak detector, said second channel includes a discriminator circuit connected to said limiter, and wherein the output of said peak detector and said discriminator are connected to said input of said amplifiers.
Claim 10
Dependent Claim
21 words
The invention as set forth in claim 8 including a low pass filter connected between said limiting means and said oscillator.
Claim 11
Dependent Claim
94 words
The invention as set forth in claim 8 wherein said peak detector and said discriminator each including a separate capacitor across which their respective channel outputs are developed, said peak detector and said discriminator also separately including diodes, connected to their respective capacitors with opposite polarizations whereby said channel outputs have opposite polarities, said discriminator including an input capacitor and a pair of diodes connected in series across the first channel output capacitor, said input capacitor being connected in series with one of said second windings to the junction of said pair of diodes.
References Cited (Backward Citations)
US2811642A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |