US3614587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Saturation current protection apparatus for saturable core transformers
Assignee: Individual
•
Filing: 1970-07-01
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Granted: 1971-10-19
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Expires: 1990-07-01
Abstract
Abstract This disclosure describes a saturation current protection apparatus for saturable core transformers. A cut core (airgap) transformer detects the occurrence of rapidly increasing magnetic current in the saturable core transformer. When a rapidly increasing current condition occurs, the cut core
Inventors
- 👤 Francis C Schwarz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:28
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/338; H02M3/3385; H02M3/3387; H02M3/3388; H02H; H02H7/00; H02H7/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
155 words
Pulse-modulated inverter apparatus comprising: a pulse-modulated inverter including a saturable core transformer; sensing means connected to the output of said pulse-modulated inverter for sensing the output of said pulse-modulated inverter and for generating a triggEr signal when said output is at a predetermined level; switchable signal-generating means connected to the output of said sensing means for generating control signals for controlling the direction of saturation of said saturable core transformer; current sensing means connected to said pulse-modulated inverter for sensing the occurrence of rapidly increasing current in said saturable core transformer and for generating gating signals in accordance with the occurrence of said rapidly increasing current; and gating means connected to the output of said current sensing means and the output of said switchable signal generating means for gating the control signals generated by said switchable signal generating means to said pulse-modulated inverter in accordance with the gating signals generated by said current sensing means.
Claim 2
Dependent Claim
155 words
Pulse-modulated inverter apparatus comprising: a pulse-modulated inverter including a saturable core transformer; sensing means connected to the output of said pulse-modulated inverter for sensing the output of said pulse-modulated inverter and for generating a triggEr signal when said output is at a predetermined level; switchable signal-generating means connected to the output of said sensing means for generating control signals for controlling the direction of saturation of said saturable core transformer; current sensing means connected to said pulse-modulated inverter for sensing the occurrence of rapidly increasing current in said saturable core transformer and for generating gating signals in accordance with the occurrence of said rapidly increasing current; and gating means connected to the output of said current sensing means and the output of said switchable signal generating means for gating the control signals generated by said switchable signal generating means to said pulse-modulated inverter in accordance with the gating signals generated by said current sensing means.
Claim 3
Dependent Claim
34 words
Pulse-modulated inverter apparatus as claimed in claim 1 wherein said current-sensing means comprises an excess current detector to said pulse-modulated inverter and a bistable multivibrator connected to the output of said excess current detector.
Claim 4
Dependent Claim
60 words
Pulse-modulated inverter apparatus as claimed in claim 2 wherein said switchable signal generating means comprises a distributing gate connected to said sensing means and a triggered astable multivibrator connected to the output of said distributing gate, said distributing gate also having inputs connected to separate outputs of said triggered astable multivibrator in addition to its input from said sensing means.
Claim 5
Dependent Claim
85 words
Pulse-modulated inverter apparatus as claimed in claim 3 wherein said gating means comprises first and second AND gates, said first AND gate connected to one output of said triggered astable multivibrator and one output of said bistable multivibrator having an input connected to said pulse-modulated inverter, and said second AND gate having one input connected to the second output of said triggered astable multivibrator and a second input connected to the output of said bistable multivibrator and having an output connected to said pulse-modulated inverter.
Claim 6
Dependent Claim
26 words
Pulse-modulated inverter apparatus as claimed in claim 4 including a rectifier connected between the output of said pulse-modulated inverter and the input of said sensing means.
Claim 7
Dependent Claim
88 words
Pulse-modulated inverter apparatus as claimed in claim 5 wherein said sensing means comprises: a level sensor connected to the output of said rectifier; a reference source; a summer having one input connected to the output of said level sensor and a second input connected to the output of said reference source; an integrator having its input connected to the output of said summer; and a threshold sensor having its input connected to the output of said integrator and its output connected to the input of said distributing gate.
Claim 8
Dependent Claim
28 words
Pulse-modulated inverter apparatus as claimed in claim 6 including a DC source connected to said pulse-modulated inverter and a low-pass filter connected to the output of said rectifier.
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) | 1974-10-18 | 1975-04-19 | 1975-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-18 | 1979-04-19 | 1979-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-18 | 1983-04-19 | 1983-10-19 | $7700.00 | Window Closed / Lapsed |