Patent US5079506A successfully refreshed from Google Patents.
US5079506A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Checking circuit for checking the normal operation of a sensor
Assignee: Samsung Electronics Co Ltd
•
Filing: 1989-10-02
•
Granted: 1992-01-07
•
Expires: 2009-10-02
Abstract
Abstract A checking circuit for checking the normal operation of a sensor comprising a sensor, a controller for switching the checking circuit operation between an open check mode and a sensing mode. The circuit for effecting the open check mode is responsive to a first logical output signal from the controller. The circuit for effecting the sensing mode is responsive to a second logical output signal from the controller, however, the sensing is only accomplished after successful completion of the open check mode.
Inventors
- 👤 Jin-Kyu Choi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:26
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/28; G01R31/282; G01R31/2829
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
296 words
A system for checking whether the operation of a sensor is normal, comprising: (a) a sensor; (b) a checking circuit coupled to said sensor having an open check mode and a sensing mode; (c) a controller for responding to output control signals from said checking circuit by generating a first output control signal to switch said checking circuit to said open check mode and a second output control signal to switch said checking circuit to said sensing mode; (d) an open check mode transistor electrically connected to said controller, said open check mode transistor being switched on in said open check mode so that: (i) a first open check mode resistor is electrically connected between a power supply terminal and an input terminal to said controller; (ii) a second open check mode resistor is electrically connected between said input terminal to said controller and a first end of said sensor; (iii) a second end of said sensor is electrically connected to ground; and (iv) said open check mode transistor is connected in series between said first open check mode resistor and said input terminal to said controller; and (e) first and second sensing mode transistors electrically connected to said controller, said sensing mode transistors being switched on in said sensing mode so that: (i) a first end of a first sensing mode resistor is electrically connected to said input terminal to said controller; (ii) a second sensing mode resistor and said sensor are electrically connected in parallel between a second end of said first sensing mode resistor and ground; (iii) a third sensing mode resistor is electrically connected between said power supply terminal and said input terminal to said controller; and (iv) said sensing mode transistor are electrically connected in series with said sensing mode resistors.
Claim 2
Independent Claim
296 words
A system for checking whether the operation of a sensor is normal, comprising: (a) a sensor; (b) a checking circuit coupled to said sensor having an open check mode and a sensing mode; (c) a controller for responding to output control signals from said checking circuit by generating a first output control signal to switch said checking circuit to said open check mode and a second output control signal to switch said checking circuit to said sensing mode; (d) an open check mode transistor electrically connected to said controller, said open check mode transistor being switched on in said open check mode so that: (i) a first open check mode resistor is electrically connected between a power supply terminal and an input terminal to said controller; (ii) a second open check mode resistor is electrically connected between said input terminal to said controller and a first end of said sensor; (iii) a second end of said sensor is electrically connected to ground; and (iv) said open check mode transistor is connected in series between said first open check mode resistor and said input terminal to said controller; and (e) first and second sensing mode transistors electrically connected to said controller, said sensing mode transistors being switched on in said sensing mode so that: (i) a first end of a first sensing mode resistor is electrically connected to said input terminal to said controller; (ii) a second sensing mode resistor and said sensor are electrically connected in parallel between a second end of said first sensing mode resistor and ground; (iii) a third sensing mode resistor is electrically connected between said power supply terminal and said input terminal to said controller; and (iv) said sensing mode transistor are electrically connected in series with said sensing mode resistors.
Claim 3
Dependent Claim
34 words
The system as claimed in claim 1, wherein an emitter terminal of one of said sensing mode transistors and a collector terminal of said open check mode transistors are electrically connected to said sensor.
Claim 4
Dependent Claim
16 words
The system as claimed in claim 2, wherein said sensor comprises an ambient condition responsive impedance.
Claim 5
Dependent Claim
16 words
The system as claimed in claim 3, wherein said ambient condition responsive impedance comprises a thermistor.
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) | 1995-01-06 | 1995-07-08 | 1996-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-06 | 1999-07-08 | 2000-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-06 | 2003-07-08 | 2004-01-07 | $7700.00 | Window Closed / Lapsed |