Patent US4654579A successfully refreshed from Google Patents.
US4654579A
Expired / Lapsed
US
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Frequency divider
Assignee: KEN HAYASHIBARA 9-8
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Filing: 1985-07-24
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Granted: 1987-03-31
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Expires: 2005-07-24
Abstract
Abstract The frequency of an alternating current can be divided with a novel frequency divider, comprising a thyristor connected in series to main current circuit; a counting circuit (e.g. decimal counter or RC-time constant circuit); a trigger circuit for the thyristor, associated with the counting circuit; and a reset circuit. With use of the apparatus, half- or whole-cycle(s) of an alternating current can be supplied to ac appliance at desirable wave intervals.
Inventors
- 👤 Kazumi Masaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:12
CPC Classifications
H; H02; H02M; H02M5/00; H02M5/02; H02M5/04; H02M5/22; H02M5/25; H02M5/257; H02M5/2573
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
215 words
A device for dividing the frequency of an alternating current, comprising: (a) a first thyristor having a gate and a main current path connected in series with an ac source through a load; (b) a variable resistor, said variable resistor being set in such a manner that the half- or full-wave of said ac source is allowed to pass through said main current path of said first thyristor at desirable intervals; (c) a grounded-emitter transistor operated under saturated conditions and having a base and a collector, said collector being connected to said gate of said first thyristor through said variable resistor; (d) a phase-shifting circuit having an input terminal connected to said ac source, and an output terminal connected to said base of said grounded-emitter transistor; (e) an RC-integrating circuit having means, connected with said ac source for electrifying said grounded-emitter transistor; (f) a current-sensing means for sensing the current across said load, said current-sensing means being connected in series with said load; and (g) a second thyristor having a gate and a main path connected with said RC-integrating circuit, said gate of said second thyristor being connected with said current-sensing means for discharging said electrifying means of said RC-integrating circuit in response to the voltage drop across said current-sensing means to reset said device.
Claim 2
Independent Claim
215 words
A device for dividing the frequency of an alternating current, comprising: (a) a first thyristor having a gate and a main current path connected in series with an ac source through a load; (b) a variable resistor, said variable resistor being set in such a manner that the half- or full-wave of said ac source is allowed to pass through said main current path of said first thyristor at desirable intervals; (c) a grounded-emitter transistor operated under saturated conditions and having a base and a collector, said collector being connected to said gate of said first thyristor through said variable resistor; (d) a phase-shifting circuit having an input terminal connected to said ac source, and an output terminal connected to said base of said grounded-emitter transistor; (e) an RC-integrating circuit having means, connected with said ac source for electrifying said grounded-emitter transistor; (f) a current-sensing means for sensing the current across said load, said current-sensing means being connected in series with said load; and (g) a second thyristor having a gate and a main path connected with said RC-integrating circuit, said gate of said second thyristor being connected with said current-sensing means for discharging said electrifying means of said RC-integrating circuit in response to the voltage drop across said current-sensing means to reset said device.
Claim 3
Dependent Claim
14 words
The device of claim 1, wherein said first thyristor is a reverse-blocking triode thyristor.
Claim 4
Dependent Claim
14 words
The device of claim 1, wherein said first thyristor is a bidirectional triode thyristor.
Claim 5
Dependent Claim
12 words
The device of claim 1, wherein said load is an electric motor.
Claim 6
Dependent Claim
13 words
The device of claim 1, wherein said current-sensing means is composed of diodes.
Claim 7
Dependent Claim
12 words
The device of claim 1, wherein said electrifying means comprises a capacitor.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-30 | 1990-09-29 | 1991-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-30 | 1994-09-29 | 1995-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-30 | 1998-09-29 | 1999-03-31 | $7700.00 | Window Closed / Lapsed |