US3593062A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control apparatus responsive to excess current utilizing temperature sensitive resistors
Assignee: Zyrotron Ind Inc
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Filing: 1970-01-13
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Granted: 1971-07-13
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Expires: 1990-01-13
Abstract
Abstract A control apparatus for controlling the operation of an associated device which includes a first switch comprising a pair of silicon controlled rectifiers connected in inverse parallel relationship between a load and a source of power. The silicon controlled rectifiers or SCR''s are gated on by a gate signal from a gate signal generator which is connected to the first switch SCR''s by a control SCR. Conduction of the control SCR is regulated by a selectively operable device which, therefore, controls the operation of the first switch to connect power to the load. In practice, a second switch is serially connected to the first switch and similarly comprises a pair of SCR''s connected in inverse parallel relationship. The conduction of the SCR''s comprising the second switch are controlled by a condition responsive device which is operable to cause these SCR''s to stop conducting in response to the occurrence of a preselected event. After such event, the selectively operable device must be actuated to close the first switch.
Inventors
- 👤 Frederic R Quinn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:15
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/005; H02H5/00; H02H5/04; H02H5/042
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
244 words
A control apparatus for controlling the operation of an associated device comprising first switching means for connecting the associated device with a source of power; said first switching means comprising a first and a second variable impedance each having an input, an output, and a control electrode and each being operable to establish a current path between the input and output electrodes in response to a gating signal applied between the associated input and control electrodes; and first lead means for connecting the input electrodes of said first and second variable impedance means with the respective output electrodes of said second and first variable impedance means; a common third variable impedance means having an input, an output and a control electrode and being operable to establish a current path between said input and output electrodes in response to an operate signal applied between the control and input electrodes thereof; gating signal generating means for generating a gating signal; second lead means for connecting said common third variable impedance means in series with said gating signal generating means between the input and control electrodes of both of said first and second variable impedance means; and selectively operable actuating means for applying an operate signal between said control and input electrodes of said common third variable impedance means to render said third variable impedance means conductive whereby gating signals are applied between the respective input and control electrodes of said first and second variable impedance means.
Claim 2
Dependent Claim
244 words
A control apparatus for controlling the operation of an associated device comprising first switching means for connecting the associated device with a source of power; said first switching means comprising a first and a second variable impedance each having an input, an output, and a control electrode and each being operable to establish a current path between the input and output electrodes in response to a gating signal applied between the associated input and control electrodes; and first lead means for connecting the input electrodes of said first and second variable impedance means with the respective output electrodes of said second and first variable impedance means; a common third variable impedance means having an input, an output and a control electrode and being operable to establish a current path between said input and output electrodes in response to an operate signal applied between the control and input electrodes thereof; gating signal generating means for generating a gating signal; second lead means for connecting said common third variable impedance means in series with said gating signal generating means between the input and control electrodes of both of said first and second variable impedance means; and selectively operable actuating means for applying an operate signal between said control and input electrodes of said common third variable impedance means to render said third variable impedance means conductive whereby gating signals are applied between the respective input and control electrodes of said first and second variable impedance means.
Claim 3
Dependent Claim
79 words
A control apparatus as in claim 1 and second switching means connected in series with said first switching means between the associated device and the source of power, operable between a first state and a second state in response to a preselected condition, one of said first and second states corresponding to a closed condition of said second switching means and the other of said first and second states corresponding to an open condition of said second switching means.
Claim 4
Dependent Claim
130 words
A control apparatus as in claim 2, in which said second switching means comprises fourth and fifth variable impedance means each having an input, an output and a control electrode and each being operable to establish a current path between the input and output electrodes in response to a gating signal received between the input and control electrodes; lead means for connecting the input electrodes of said fourth and fifth variable impedance means to the respective output electrodes of the fifth and fourth variable impedance means; signal means for applying a gating signal between the control and input electrodes of said fourth and fifth variable impedance means; said signal means comprising operating means for controlling the operation of said signal means in response to the occurrence of a preselected condition.
Claim 5
Dependent Claim
97 words
A control apparatus as in claim 3, in which said signal means comprises a bridge network having four arms and an output, one of said arms comprising said operating means, said operating means normally maintaining said bridge in a balanced condition, output means connected between said bridge output and the control and input electrodes of said fourth and fifth variable impedance means, said operating means being operable to unbalance said bridge in response to said preselected condition to render said fourth and fifth variable impedance means nonconductive corresponding to the open state of said second switching means.
Claim 6
Dependent Claim
31 words
A control apparatus as in claim 4, in which said operating means comprises a thermal sensor having an impedance which changes rapidly at a preselected temperature, whereby said bridge becomes unbalanced.
Claim 7
Dependent Claim
62 words
A control apparatus as in claim 4, in which said fourth and fifth variable impedance means are silicon controlled rectifiers having cathode, anode and gate electrodes, wherein said input electrode corresponds to the cathode electrode, said output electrode corresponds to the anode electrode, and said control electrode corresponds to said gate electrode, said silicon controlled rectifiers being connected in inverse parallel relationship.
Claim 8
Dependent Claim
88 words
A control apparatus as in claim 1, in which said first and second variable impedance means comprise silicon controlled rectifiers each having an anode, cathode and gate electrodes wherein said input electrode corresponds to said cathode electrode, said output electrode corresponds to said anode electrode and said control electrode corresponds to said gait electrode, said first lead means connecting said silicon controlled rectifiers in inverse parallel relationship, and a respective unidirectional current conducting means in series with each silicon controlled rectifier to prevent leakage currents from flowing therethrough.
Claim 9
Dependent Claim
45 words
A control apparatus as in claim 1, in which said third variable impedance means comprises a silicon controlled rectifier having an anode electrode corresponding to said output electrode, a cathode electrode corresponding to said input electrode and a gate electrode corresponding to said control electrode.
Claim 10
Dependent Claim
78 words
A control apparatus as in claim 8, in which said actuating means includes biasing means for producing said operate signal and shorting means normally shorting together said gate and cathode electrodes of said third silicon controlled rectifier and being manually operable to break said connection between said gate and cathode electrodes of said third silicon controlled rectifier and permit said biasing means to apply said operate signal to said third silicon controlled rectifier to render the same conductive.
Claim 11
Dependent Claim
139 words
A control apparatus for controlling the operation of an associated device comprising first and second switch means connected in series between a source of energy and the associated device and each being operable between an open and a closed state, condition responsive means for controlling the operation of said second switch means to move said first switch means between said closed and open states in response to the occurrence of a preselected condition, gating signal means for applying a gating signal to said first switch means to move said second switch means to the closed state, control means between said gating signal means and said first switch means for connecting said gating signal to said first switch means, in response to a biasing signal, and selectively operable biasing signal means for applying said biasing signal to said control means.
Claim 12
Dependent Claim
139 words
A control apparatus for controlling the operation of an associated device comprising first and second switch means connected in series between a source of energy and the associated device and each being operable between an open and a closed state, condition responsive means for controlling the operation of said second switch means to move said first switch means between said closed and open states in response to the occurrence of a preselected condition, gating signal means for applying a gating signal to said first switch means to move said second switch means to the closed state, control means between said gating signal means and said first switch means for connecting said gating signal to said first switch means, in response to a biasing signal, and selectively operable biasing signal means for applying said biasing signal to said control means.
Claim 13
Dependent Claim
43 words
A control apparatus as in claim 10, in which said first and second switch means each comprise a respective pair of silicon controlled rectifiers connected in inverse parallel relationship wherein each of said rectifiers has an anode, a cathode and a gate electrode.
Claim 14
Dependent Claim
86 words
A control apparatus as in claim 11, in which said condition responsive means comprises signal generating means for applying a signal between the cathode and gate electrodes of said pair of silicon controlled rectifiers comprising said second switch means to render said rectifiers conductive, said signal generating means including sensing means responsive to the occurrence of said preselected condition for applying a signal between the cathode and gate electrodes of said pair of silicon controlled rectifiers comprising said second switch means to render said rectifiers nonconductive.
Claim 15
Dependent Claim
35 words
A control apparatus as in claim 12, in which said sensing means comprises a thermal device having an impedance which drops rapidly at a preselected temperature, and said preselected event corresponds to said preselected temperature.
Claim 16
Dependent Claim
76 words
A control apparatus as in claim 11, in which said control means comprises a silicon controlled rectifier having an anode, a cathode and a gate electrode; said biasing signal means comprising first means for generating a triggering signal to render said control means rectifier conductive, and a switch normally disconnecting said first means from said control means silicon controlled rectifier and being manually operable to connect said first means with said control means silicon controlled 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) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |