US3920955A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic thermally sensitive switch device
Assignee: Mitsubishi Electric Corp
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Filing: 1974-09-16
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Granted: 1975-11-18
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Expires: 1994-09-16
Abstract
Abstract Two thermally sensitive thyristors are connected in reverse parallel between a gate electrode of a triac and the junction of two resistors serially connected across both main electrodes of the traic. The thyristors are externally heated to control a load through the triac. Alternatively, such thyristors may be serially connected to a resistor across the main electrodes of the triac while two diodes are connected in reverse parallel between its gate electrode and the junction of the resistor and thyristors. In either event, the parallel thyristors may be replaced by a full-wave rectifier bridge having a thermally sensitive thyristor connected across dc outputs of the bridge.
Inventors
- 👤 Josuke Nakata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:56
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/08; H02M1/083; G; G05; G05D; G05D23/00; G05D23/19; G05D23/20; G05D23/2033; G05D23/2034; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/40; G05F1/44; G05F1/45; G05F1/452; H03; H03K; H03K17/00; H03K17/13; H03K17/136
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
57 words
An electronic thermally sensitive switch device comprising a bidirectional triode thyristor including a gate electrode and a main electroDe to control a load, at least one thermally sensitive thyristor connected between said gate and main electrodes of said bidirectional triode thyristor and means for operating said thermally sensitive thyristor in response to heat to control said load.
Claim 2
Dependent Claim
57 words
An electronic thermally sensitive switch device comprising a bidirectional triode thyristor including a gate electrode and a main electroDe to control a load, at least one thermally sensitive thyristor connected between said gate and main electrodes of said bidirectional triode thyristor and means for operating said thermally sensitive thyristor in response to heat to control said load.
Claim 3
Dependent Claim
65 words
An electronic thermally sensitive switch device as claimed in claim 1 wherein said means for operating said thermally sensitive thyristor includes a gate trigger current path for said bidirectional triode thyristor and said thermally sensitive thyristor is operative in response to heat to close said gate triggering current path to permit an electric power to be supplied to said load through said bidirectional triode thyristor.
Claim 4
Dependent Claim
39 words
An electric thermally sensitive switch device as claimed in claim 1 wherein said thermally sensitive thyristor is operative in response to heat to bypass a gate triggering current for said bidirectional triode thyristor therethrough to turn the latter off.
Claim 5
Dependent Claim
35 words
An electronic thermally sensitive switch device as claimed in claim 1 wherein a pair of thermally sensitive thyristors are connected in anti-parallel circuit relationship between said gate and main electrodes of said bidirectional triode diode.
Claim 6
Dependent Claim
22 words
An electronic thermally sensitive switch device as claimed in claim 1 wherein said thermally sensitive thyristor is thermally coupled to said load.
Claim 7
Dependent Claim
77 words
An electronic thermally sensitive switch device comprising a bidirectional triode thyristor including a gate electrode and a main electrode to control a load, a full-wave rectifier bridge having a pair of alternating current inputs terminals connected to said gate and main electrodes of said bidirectional triode thyristor respectively, and a thermally sensitive thyristor connected across a pair of direct current output terminals of said full-wave rectifier bridge and operative in response to heat to control said load.
Claim 8
Dependent Claim
77 words
An electronic thermally sensitive switch device comprising a bidirectional triode thyristor including a gate electrode and a main electrode to control a load, a full-wave rectifier bridge having a pair of alternating current inputs terminals connected to said gate and main electrodes of said bidirectional triode thyristor respectively, and a thermally sensitive thyristor connected across a pair of direct current output terminals of said full-wave rectifier bridge and operative in response to heat to control said load.
Claim 9
Dependent Claim
56 words
An electronic thermally sensitive switch device as claimed in claim 6 wherein said bidirectional triode thyristor includes a gate triggering current path and said thermally sensitive thyristor is operative in response to heat to close said gate triggering current path to permit an electric power to be supplied to said load through said bidirectional triode thyristor.
Claim 10
Dependent Claim
39 words
An electronic thermally sensitive switch device as claimed in claim 6 wherein said thermally sensitive thyristor is operative in response to heat to bypass a gate triggering current for said bidirectional triode thyristor therethrough to turn the latter off.
Claim 11
Dependent Claim
29 words
An electronic thermally sensitive switch device as claimed in claim 1 wherein said thermally sensitive thyristor is provided with a gate biasing circuit for controlling the switching temperature thereof.
Claim 12
Dependent Claim
31 words
An electronic thermally sensitive switch device as claimed in claim 9 wherein said gate biasing circuit includes a resistor connected across the gate and cathode electrodes of said thermally sensitive thyristor.
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) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |