US3577040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solenoid control circuit
Assignee: Pneumo Dynamics Corp
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Filing: 1968-09-26
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Granted: 1971-05-04
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Expires: 1988-09-26
Abstract
Abstract An electronic circuit for actuating a solenoid load from an AC power source in a two-step sequence wherein a high DC voltage is initially applied to ''''pull-in'''' the solenoid armature and a lower voltage maintains the armature in a ''''hold'''' condition. Silicon-controlled rectifiers (SCR''s) provide an electronic switching and rectification of the voltage for operating power. The circuit is controlled by an electrical signal which conditions the SCR''s to provide operating voltage during alternate half cycles of the power source and a time delay circuit allows conduction of the ''''pull-in'''' SCR for only a few cycles of the power source.
Inventors
- 👤 Richard H Campbell Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:14
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/06; H01F7/08; H01F7/18; H01F7/1805; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/72; H03K17/725
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
176 words
A circuit for energizing a solenoid from a source of AC power, comprising a power transformer energized from said source of AC power, said transformer having a secondary winding with an intermediate tap thereon to provide a relatively high-voltage terminal and a relatively low-voltage terminal, the voltages at said terminals being 180* out of phase, a first SCR having an anode-cathode path in series connection with said high-voltage tap, said solenoid and said intermediate tap, a second SCR having an anode-cathode path in series connection with said low-voltage tap, said solenoid and said intermediate tap, a diode in parallel connection with said solenoid, said diode being reversely poled with respect to said first and second SCR''s, a terminal adapted for receipt of a control signal for energizing said solenoid, means connecting said terminal to the gate electrode of said second SCR for activating same during the interval of a control signal, and timing means connecting said terminal to the gate electrode of said first SCR for temporarily activating same in the interval of a control signal.
Claim 2
Dependent Claim
176 words
A circuit for energizing a solenoid from a source of AC power, comprising a power transformer energized from said source of AC power, said transformer having a secondary winding with an intermediate tap thereon to provide a relatively high-voltage terminal and a relatively low-voltage terminal, the voltages at said terminals being 180* out of phase, a first SCR having an anode-cathode path in series connection with said high-voltage tap, said solenoid and said intermediate tap, a second SCR having an anode-cathode path in series connection with said low-voltage tap, said solenoid and said intermediate tap, a diode in parallel connection with said solenoid, said diode being reversely poled with respect to said first and second SCR''s, a terminal adapted for receipt of a control signal for energizing said solenoid, means connecting said terminal to the gate electrode of said second SCR for activating same during the interval of a control signal, and timing means connecting said terminal to the gate electrode of said first SCR for temporarily activating same in the interval of a control signal.
Claim 3
Dependent Claim
39 words
A circuit as set forth in claim 2 wherein said timing means comprises an RC charging circuit adapted to transmit only the initial portion of each control signal at said terminal to the gate electrode of said first SCR.
Claim 4
Dependent Claim
54 words
A circuit as set forth in claim 2 wherein said charging circuit comprises capacitor operatively connected in series with said terminal and the gate electrode of said first SCR, a fixed resistor connected between the gate electrode side of said capacitor and said intermediate tap, and a diode in shunt connection with said resistor.
References Cited (Backward Citations)
US3181039A
Cited
US3268776A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-03 | 1974-11-02 | 1975-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-03 | 1978-11-02 | 1979-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-03 | 1982-11-02 | 1983-05-04 | $7700.00 | Window Closed / Lapsed |