US3596111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solenoid energizing circuitry
Assignee: International Business Machines Corp
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Filing: 1969-06-13
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Granted: 1971-07-27
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Expires: 1989-06-13
Abstract
Abstract Varying unidirectional voltage energizing circuitry for electric devices, solenoids for example, to be energized selectively with maintained silicon controlled rectifiers (SCR) and the like is embodied with smaller, less expensive, lighter and more reliable than conventional filtered direct current circuit embodiments. Full (or half) wave rectified sine wave voltage is applied across a series connected solenoid and SCR device or a parallel arranged multiple of solenoids and SCR devices connected in series. Conventional electric gating pulses are applied to the gate electrodes of the SCR devices for initiating conduction in the conventional manner. Fall of energizing potential below the voltage level corresponding to minimum holding current is rendered ineffective to extinguish conduction by a transistor and series resistor maintaining a small current flow through the SCR device(s) until the value of energizing potential again rises above the voltage level of minimum holding current. The series resistor defines the maintaining holding current. Diodes are interposed between the combinations of series connected solenoid and SCR devices to isolate them one from another permitting energization of the solenoids at differing times and for differing time periods.
Inventors
- 👤 Jerome Danforth Harr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:25
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/72; H03K17/735; G; G06; G06K; G06K15/00; G06K15/02; G06K15/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
254 words
A solenoid energizing circuit, comprising: a transformer having a primary winding and a secondary winding, rectifying means connected to said secondary winding for producing in response to sine wave voltage applied to said primary winding a unidirectional potential varying cyclically in amplitude from a useful range of values down to a substantially ineffective range, a multiple of solenoids each having one terminal connected to a common point in the potential producing circuit, a multiple of silicon controlled rectifiers, anode and gate electrodes and having cathode electrodes connected to another common point in said potential producing circuit, the anode electrodes of said silicon controlled rectifiers being individually connected to the other terminals of said solenoids, gating circuitry connected to the gate electrodes of said rectifiers for establishing current flow through predetermined ones of said solenoids at times when said potential is greater than said value below which it is ineffective, a transistor having a base electrode, a collector electrode and an emitter electrode, a diode and a resistor connected in series between the anode electrode of each of said rectifiers and a common point in the emitter electrode circuit of said transistor, direct potential means for energizing said gating circuitry and for biasing the base and collector electrodes of said transistor, and circuitry for applying a direct voLtage on the base electrode of said transistor for maintaining current flow in each solenoid and rectifier combination during the periods when the amplitude of said varying unidirectional potential applied thereacross is below said useful range of values.
Claim 2
Dependent Claim
254 words
A solenoid energizing circuit, comprising: a transformer having a primary winding and a secondary winding, rectifying means connected to said secondary winding for producing in response to sine wave voltage applied to said primary winding a unidirectional potential varying cyclically in amplitude from a useful range of values down to a substantially ineffective range, a multiple of solenoids each having one terminal connected to a common point in the potential producing circuit, a multiple of silicon controlled rectifiers, anode and gate electrodes and having cathode electrodes connected to another common point in said potential producing circuit, the anode electrodes of said silicon controlled rectifiers being individually connected to the other terminals of said solenoids, gating circuitry connected to the gate electrodes of said rectifiers for establishing current flow through predetermined ones of said solenoids at times when said potential is greater than said value below which it is ineffective, a transistor having a base electrode, a collector electrode and an emitter electrode, a diode and a resistor connected in series between the anode electrode of each of said rectifiers and a common point in the emitter electrode circuit of said transistor, direct potential means for energizing said gating circuitry and for biasing the base and collector electrodes of said transistor, and circuitry for applying a direct voLtage on the base electrode of said transistor for maintaining current flow in each solenoid and rectifier combination during the periods when the amplitude of said varying unidirectional potential applied thereacross is below said useful range of values.
Claim 3
Dependent Claim
225 words
A solenoid energizing circuit, comprising: a source of unidirectional potential varying cyclically in amplitude from a useful range of values down to a substantially ineffective range, a multiple of solenoids each having one terminal connected to a common point in said source of potential, a multiple of silicon controlled rectifiers, anode and gate electrodes and having cathode electrodes connected to another common point in said source potential, the anode electrodes of said silicon controlled rectifiers being individually connected to the other terminals of said solenoids, gating circuitry connected to the gate electrodes of said rectifiers for establishing current flow through predetermined ones of said solenoids at times when said potential is greater than said value below which it is ineffective, a transistor having a base electrode, a collector electrode and an emitter electrode, a diode and a resistor connected in series between the anode electrode of each of said rectifiers and a common point in the emitter electrode circuit of said transister, direct potential means for energizing said gating circuitry and for baising the base and collector electrodes of said transistor, and circuitry for applying a direct voltage on the base electrode of said transistor for maintaining current flow in each solenoid and rectifier combination during the periods when the amplitude of said varying unidirectional potential applied thereacross is below said useful range of values.
Claim 4
Dependent Claim
225 words
A solenoid energizing circuit, comprising: a source of unidirectional potential varying cyclically in amplitude from a useful range of values down to a substantially ineffective range, a multiple of solenoids each having one terminal connected to a common point in said source of potential, a multiple of silicon controlled rectifiers, anode and gate electrodes and having cathode electrodes connected to another common point in said source potential, the anode electrodes of said silicon controlled rectifiers being individually connected to the other terminals of said solenoids, gating circuitry connected to the gate electrodes of said rectifiers for establishing current flow through predetermined ones of said solenoids at times when said potential is greater than said value below which it is ineffective, a transistor having a base electrode, a collector electrode and an emitter electrode, a diode and a resistor connected in series between the anode electrode of each of said rectifiers and a common point in the emitter electrode circuit of said transister, direct potential means for energizing said gating circuitry and for baising the base and collector electrodes of said transistor, and circuitry for applying a direct voltage on the base electrode of said transistor for maintaining current flow in each solenoid and rectifier combination during the periods when the amplitude of said varying unidirectional potential applied thereacross is below said useful range of values.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |