US4384844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Load drive control element check circuit
Assignee: Azbil Corp
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Filing: 1981-01-05
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Granted: 1983-05-24
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Expires: 2001-01-05
Abstract
Abstract The present disclosure relates to a load drive control element check circuit for checking whether or not conduction and non-conduction troubles take place in a load controlling switching element at the final output stage of a control device, which is required for safety, such as a combustion control circuit.
Inventors
- 👤 Yuji Yamamoto
- 👤 Sei Shiragaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:01
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/20; F23N5/203; F23N2227/00; F23N2227/04; F23N2227/12; F23N2227/28; F23N2227/30; F23N2229/00; F23N2233/00; F23N2233/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
118 words
A load drive control element check circuit comprising: a load drive circuit for controlling the enrergization and de-energization of a load in accordance with the conduction and non-conduction of a load drive control element; a control circuit for feeding a control operation output signal to said load drive circuit thereby to energize said control element; a detecting circuit for detecting the existence of a conduction trouble condition signal in said control element, and providing a condition signal, and a condition discriminating circuit for discriminating the conduction trouble of said control element through a gate circuit which is made receptive of both said control operation output signal of said control circuit and said condition signal of said detecting circuit.
Claim 2
Dependent Claim
118 words
A load drive control element check circuit comprising: a load drive circuit for controlling the enrergization and de-energization of a load in accordance with the conduction and non-conduction of a load drive control element; a control circuit for feeding a control operation output signal to said load drive circuit thereby to energize said control element; a detecting circuit for detecting the existence of a conduction trouble condition signal in said control element, and providing a condition signal, and a condition discriminating circuit for discriminating the conduction trouble of said control element through a gate circuit which is made receptive of both said control operation output signal of said control circuit and said condition signal of said detecting circuit.
Claim 3
Dependent Claim
31 words
A load drive control element check circuit as set forth in claim 1, wherein said load drive circuit uses a combustion fan motor or a fuel feeding device as said load.
Claim 4
Dependent Claim
153 words
A load drive control element check circuit comprising: a load drive circuit for controlling the energization and de-energization of a load in accordance with the conduction and non-conduction of a load drive control element; a control circuit for feeding a control operation signal to said load drive circuit thereby to energize said control element; a detecting circuit for detecting the existence of a conduction trouble condition signal in said control element; and providing a condition signal, and a first condition discriminating circuit for feeding an operation command output to said control circuit in accordance with the condition of a starter switch or a flame signal, wherein there is provided a second condition discriminating circuit for discriminating the conduction trouble of said control element through a gate circuit which is made receptive of said control operation output signal of said control circuit, said condition signal of said detecting circuit and said operation command output.
Claim 5
Dependent Claim
153 words
A load drive control element check circuit comprising: a load drive circuit for controlling the energization and de-energization of a load in accordance with the conduction and non-conduction of a load drive control element; a control circuit for feeding a control operation signal to said load drive circuit thereby to energize said control element; a detecting circuit for detecting the existence of a conduction trouble condition signal in said control element; and providing a condition signal, and a first condition discriminating circuit for feeding an operation command output to said control circuit in accordance with the condition of a starter switch or a flame signal, wherein there is provided a second condition discriminating circuit for discriminating the conduction trouble of said control element through a gate circuit which is made receptive of said control operation output signal of said control circuit, said condition signal of said detecting circuit and said operation command output.
Claim 6
Dependent Claim
31 words
A load drive control element check circuit as set forth in claim 3, wherein said load drive circuit uses a combustion fan motor or a fuel feeding device as said load.
Claim 7
Dependent Claim
43 words
A load drive control element check circuit as set forth in claim 4, wherein the control operation output signal of said control circuit is selectively set at the energization operation output signal of said combustion fan motor or a pre-purge timing termination signal.
Claim 8
Dependent Claim
50 words
A load drive control element check circuit as set forth in claim 5, wherein said gate circuit includes: an OR gate made receptive of said control operation signal and said condition signal; and an AND gate made receptive of the output of said OR gate and said operation command output.
Claim 9
Dependent Claim
42 words
A load drive control element check circuit as set forth in claim 6, further comprising a safety break switch circuit for the operation of said control circuit in response to said condition signal indicative of the conduction trouble of said control element.
Claim 10
Dependent Claim
70 words
A load drive element check circuit as set forth in claim 7, wherein the conduction trouble of the control element for energizing said safety break switch circuit is subjected to a cycling inversion operation from "OFF" to "ON" and again to "OFF" in response to the output of said second condition discriminating circuit so that the non-conduction trouble of said control element may be checked by said cycling inversion operation.
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) | 1986-05-23 | 1986-11-22 | 1987-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-23 | 1990-11-22 | 1991-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-23 | 1994-11-22 | 1995-05-24 | $7700.00 | Window Closed / Lapsed |