Patent US3904952A successfully refreshed from Google Patents.
US3904952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self synchronizing zero crossover switching circuit
Assignee: Athena Controls Inc
•
Filing: 1974-01-10
•
Granted: 1975-09-09
•
Expires: 1994-01-10
Abstract
Abstract The present circuit employs three electronic switching means, two of which are arranged in complementary form so that if the line voltage has passed through its zero value the properly polarized switching circuit will be turned on. The third electronic switching circuit is connected to the first two switching circuits and is a bi-directional switching circuit that responds to conduct current in either a first or second direction depending upon which of the first two electronic switching circuits has been turned on.
Inventors
- 👤 Egils Evalds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:55
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/40; G05F1/44; G05F1/45; G05F1/452; Y; Y10; Y10S; Y10S323/00; Y10S323/91
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
361 words
A self-synchronizing zero cross-over switching circuit comprising in combination: at least first and second applied signal terminaLs adapted to have an alternating current signal with zero cross-over characteristics applied thereto; first and second signal storage means; bi-directional current switching means having control current conducting means, first current conducting means, and second current conducting means, said first current conducting means connected to said first applied signal terminal; first circuitry means connecting said second current conducting means to said second applied signal terminal; second circuitry means connecting said first signal storage means to said control current conducting means; third circuitry means connecting said first signal storage means to said second applied signal terminal, said third circuitry means including a first unidirectional electrical current conducting means whereby when said second applied signal terminal has a positive voltage polarity relative to said first applied signal terminal, said first signal storage means will develop a voltage there across; fourth circuitry means connecting said second signal storage means to said control current conducting means; fifth circuitry means connecting said second signal storage means to said third circuitry means, said fifth circuitry means including a second uni-directional electrical current conducting means whereby when said first applied signal terminal has a positive signal relative to said second applied signal terminal, said second signal storage means will develop a voltage thereacross; signal switching network means connected to said third and fifth circuitry means as well as to said first applied signal terminal and said first circuitry means whereby when said second applied signal terminal experiences a zero cross-over with the applied signal going negative thereat, said first signal storage means will apply a negative pulse to said control current conducting means causing said bi-directional current switching means to conduct electrical current from said first applied signal terminal to said second applied signal terminal and whereby when said second applied signal terminal experiences a zero cross-over with the applied signal going positive thereat, said second signal storage means will apply a positive pulse to said control current conducting means causing said bi-directional current switching means to conduct electrical current from said second applied signal terminal to said first applied signal terminal.
Claim 2
Dependent Claim
361 words
A self-synchronizing zero cross-over switching circuit comprising in combination: at least first and second applied signal terminaLs adapted to have an alternating current signal with zero cross-over characteristics applied thereto; first and second signal storage means; bi-directional current switching means having control current conducting means, first current conducting means, and second current conducting means, said first current conducting means connected to said first applied signal terminal; first circuitry means connecting said second current conducting means to said second applied signal terminal; second circuitry means connecting said first signal storage means to said control current conducting means; third circuitry means connecting said first signal storage means to said second applied signal terminal, said third circuitry means including a first unidirectional electrical current conducting means whereby when said second applied signal terminal has a positive voltage polarity relative to said first applied signal terminal, said first signal storage means will develop a voltage there across; fourth circuitry means connecting said second signal storage means to said control current conducting means; fifth circuitry means connecting said second signal storage means to said third circuitry means, said fifth circuitry means including a second uni-directional electrical current conducting means whereby when said first applied signal terminal has a positive signal relative to said second applied signal terminal, said second signal storage means will develop a voltage thereacross; signal switching network means connected to said third and fifth circuitry means as well as to said first applied signal terminal and said first circuitry means whereby when said second applied signal terminal experiences a zero cross-over with the applied signal going negative thereat, said first signal storage means will apply a negative pulse to said control current conducting means causing said bi-directional current switching means to conduct electrical current from said first applied signal terminal to said second applied signal terminal and whereby when said second applied signal terminal experiences a zero cross-over with the applied signal going positive thereat, said second signal storage means will apply a positive pulse to said control current conducting means causing said bi-directional current switching means to conduct electrical current from said second applied signal terminal to said first applied signal terminal.
Claim 3
Dependent Claim
174 words
A self-synchronizing zero cross-over switching circuit according to claim 1 wherein said signal switching network means includes first and second signal switching means each having an input element, an output element, and a control element, and wherein said input element of said first signal switching means is connected between said first uni-directional electrical current conducting means and said first signal storage means, and wherein said control element and said output element of said first signal switching means are connected to said first applied signal terminal, and wherein said output element of said second signal switching means is connected between the said second uni-directional current conducting means and said second signal storage means, and further wherein said control element and said input element of said second signal switching means are connected to said first applied signal terminal, and further wherein said signal switching network means includes a first biasing circuit connected to said output element of said first switching means and said input element of said second switching means and said first applied signal terminal.
Claim 4
Dependent Claim
32 words
Self-synchronizing zero cross-over switching circuit according to claim 1 wherein said first circuitry means includes load means for translating said current passing through said bi-directional current switching means into a load output.
Claim 5
Dependent Claim
99 words
A self-synchronizing zero cross-over switching circuit according to claim 1 wherein said second circuitry means includes a variable resistor means and wherein there is further included means to vary said vaRiable resistor means whereby when said variable resistor means is varied in one direction, current is conducted through said bi-directional current switching means in response to said zero cross-over switching circuit experiencing a zero cross-over of said applied signal and whereby when said variable resistor means has its resistance varied in another direction, said self-synchronizing zero cross-over switching circuit is not responsive to a cross-over of said applied signal.
Claim 6
Dependent Claim
19 words
A self-synchronizing zero cross-over switching circuit according to claim 1 wherein said bi-directional current switching means is a triac.
Claim 7
Dependent Claim
32 words
A self-synchronizing zero cross-over switching circuit according to claim 1 wherein said bi-directional current switching means is a pair of silicon-controlled rectifiers and wherein said second circuitry means is a pulse transformer.
Claim 8
Dependent Claim
93 words
A self-synchronizing zero cross-over switching circuit according to claim 2 wherein there is further included a second biasing network connected to said first biasing network and connected to said first applied signal terminal whereby said first signal switching means is biased so that it cannot conduct during that portion of the applied signal that said second signal switching means will be conducting and wherein said second signal switching means is biased so that it will not conduct during that portion of the applied signal that said first signal switching means will be conducting.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |