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Patent US3786328A successfully refreshed from Google Patents.
US3786328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switching circuit for controlling alternating circuit flow
Assignee: Heberlein and Co AG
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Filing: 1972-09-15
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Granted: 1974-01-15
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Expires: 1992-09-15
Abstract
Abstract Disclosed herein is a control circuit including an automatically controlled switch coupled in series with a load and an alternating current source, wherein the switch regulates current flow in both directions of flow from the source. A triggering circuit is coupled to a control electrode of the switch for actuating the switch to permit current flow during equal energy portions of both the positive and negative half-waves of the source voltage.
Inventors
- 👤 I Bos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:31
CPC Classifications
H; H02; H02P; H02P25/00; H02P25/02; H02P25/10; H02M; H02M5/00; H02M5/02; H02M5/04; H02M5/22; H02M5/25; H02M5/257; H02M5/2573; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/72; H03K17/725
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
224 words
In a circuit for controlling bi-directional current flow through a load, wherein the current is supplied by an AC source, the improvement comprising: automatically controlled switching means having a control electrode, and having a pair of principal conducting electrodes for connection in series with a load and an AC source; and trigger circuit means having an input coupled to one of said principal conducting electrodes, and having an output coupled to said control electrode of said switching means for triggering said switching means between conducting and nonconducting states at equal intervals during both positive and negative phases of voltage supplied by said source, said trigger circuit further including a resistor and a first capacitor coupled together to provide a timing circuit, first and second rectifying means coupled together in an opposedpolarity parallel relationship to control charging and discharging with said capacitor, biasing means including a second capacitor connected in series with one of said diodes and connected to one of said rectifying means to control its conduction point, current source means connected to said second capacitor for controlling the voltage thereacross to bias said one diode, and means connected to said trigger circuit means output for sensing the said charging and discharging of said first capacitor to produce trigger signals and to apply said trigger signals to said control electrode of said switching means.
Claim 2
Dependent Claim
224 words
In a circuit for controlling bi-directional current flow through a load, wherein the current is supplied by an AC source, the improvement comprising: automatically controlled switching means having a control electrode, and having a pair of principal conducting electrodes for connection in series with a load and an AC source; and trigger circuit means having an input coupled to one of said principal conducting electrodes, and having an output coupled to said control electrode of said switching means for triggering said switching means between conducting and nonconducting states at equal intervals during both positive and negative phases of voltage supplied by said source, said trigger circuit further including a resistor and a first capacitor coupled together to provide a timing circuit, first and second rectifying means coupled together in an opposedpolarity parallel relationship to control charging and discharging with said capacitor, biasing means including a second capacitor connected in series with one of said diodes and connected to one of said rectifying means to control its conduction point, current source means connected to said second capacitor for controlling the voltage thereacross to bias said one diode, and means connected to said trigger circuit means output for sensing the said charging and discharging of said first capacitor to produce trigger signals and to apply said trigger signals to said control electrode of said switching means.
Claim 3
Dependent Claim
34 words
A circuit as set forth in claim 1 in which said current source means includes a transistor connected in series combination with said second capacitor for controlling the charging current for said second capacitor.
Claim 4
Dependent Claim
82 words
A circuit as set forth in claim 2, in which said transistor has a control electrode, and further comprising an AC motor having an armature winding connected to said switching means to provide said load, a tachometer generator mechanically coupled to said motor and providing an output signal which varies with variation in speed of said motor, and means for applying said output signal of said tachometer generator to said control electrode of said transistor for controlling the conduction of said transistor.
Claim 5
Dependent Claim
54 words
A circuit as set forth in claim 2, in which said transistor has a control electrode, and in which said current source means further includes signal source means coupled to said transistor control electrode for controlling the conduction of said transistor, and a Zener diode connected in series with said transistor and second capacitor.
Claim 6
Dependent Claim
66 words
A circuit as set forth in claim 4, further comprising an AC motor having an armature winding connected to said switching means as said load, and in which said signal source means comprises a tachometer generator mechanically coupled to said motor and providing an output signal which varies with variation in speed of said motor, wherein said tachometer output is coupled to said transistor control electrode.
Claim 7
Dependent Claim
34 words
A circuit as set forth in claim 1 in which one of said rectifying means comprises a transistor having its emitter-collector circuit coupled in said opposed-polarity parallel relationship with the other said rectifying means.
Claim 8
Dependent Claim
32 words
A circuit as set forth in claim 6, in which said biasing means includes said capacitor connected in the emitter-base circuit of said transistor for controlling the conduction point of said transistor.
Claim 9
Dependent Claim
66 words
A circuit as set forth in claim 7, further comprising an AC motor having an armature winding connected to said switching means to provide said load, a resistor connected in series with said armature winding, and voltage sensing means connected between said capacitor and said armature winding for controlling the charging and discharging of said capacitor in response to voltage changes applied to said armature winding.
Claim 10
Dependent Claim
16 words
A circuit as claimed in claim 1 in which said rectifying means each comprise a diode.
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) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |