US3914690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scr and diode tester
Assignee: Southwire Co LLC
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Filing: 1973-03-02
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Granted: 1975-10-21
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Expires: 1993-03-02
Abstract
Abstract An apparatus for testing solid state devices such as SCR''s and diodes which includes a power supply for supplying rated voltage to the device under test and a control voltage supply means for supplying a control voltage to the gate electrode of the device under test. A first indicator connected in the anode-cathode circuit of the device under test indicates whether the device is operating properly in response to the application of its rated voltage while a second indicator indicates whether the device under test is forward or reversed biased. The power supply and control voltage supply are independently variable so that diodes and SCR''s having differently-rated voltages and gate voltages may be tested. The apparatus includes a test SCR which may be connected into the apparatus in place of a device under test to insure that the apparatus is operating properly inasmuch as the response of the indicators to the test SCR is known. The apparatus also includes an overload protection circuit which is used when the rated voltage of the device under test is above a predetermined level. The overload protection circuit connects an additional lamp in series with an indicator lamp of the first indicator, and also connects a resistance in series with the second indicator.
Inventors
- 👤 Robbie E Shelnutt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:36
CPC Classifications
G; G01; G01R; G01R1/00; G01R1/36; G01R31/00; G01R31/26; G01R31/2607; G01R31/263; H; H02; H02H; H02H3/00; H02H3/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
296 words
An apparatus for testing SCRs and diodes comprising: a. alternating-current power supply means for supplying selectively rated anode-cathode a.c. voltages to a diode or an SCR sought to be tested; b. control voltage supply means for supplying selectively a rated control voltage to the gate electrode of an SCR sought to be tested, said control voltage supply means and said power supply means being independently variable; c. an SCR having known characteristics; d. connection means including switch means having (1) a first position for connecting, via a given circuit within the apparatus, said alternating-current power supply means to the anode-cathode circuit of said SCR having known characteristics and for connecting said control voltage supply means to its gate electrode, and having (2) a second position for connecting, via said given circuit within the apparatus, said power supply means to the anode-cathode circuit of a diode or an SCR sought to be tested; e. first indicator means coupled to said switch means for indicating whether the diode or SCR sought to be tested operates properly in response to said rated voltages when said switch means is in said second position; f. second indicator means coupled to said switch means for indicating whether the diode or SCR sought to be tested is forwardly or reversely biased, when said switch means is in said second position, said first indicator means and said second indicator means indicating whether the apparatus is properly operating when said switch means is in its first position; and g. overload protection means for protecting said first and second indicator means when said power supply means supplies a voltage above a given level by connecting additional impedance in series with said first and second indicator means whereby said apparatus continues to operate in a normal fashion.
Claim 2
Independent Claim
296 words
An apparatus for testing SCRs and diodes comprising: a. alternating-current power supply means for supplying selectively rated anode-cathode a.c. voltages to a diode or an SCR sought to be tested; b. control voltage supply means for supplying selectively a rated control voltage to the gate electrode of an SCR sought to be tested, said control voltage supply means and said power supply means being independently variable; c. an SCR having known characteristics; d. connection means including switch means having (1) a first position for connecting, via a given circuit within the apparatus, said alternating-current power supply means to the anode-cathode circuit of said SCR having known characteristics and for connecting said control voltage supply means to its gate electrode, and having (2) a second position for connecting, via said given circuit within the apparatus, said power supply means to the anode-cathode circuit of a diode or an SCR sought to be tested; e. first indicator means coupled to said switch means for indicating whether the diode or SCR sought to be tested operates properly in response to said rated voltages when said switch means is in said second position; f. second indicator means coupled to said switch means for indicating whether the diode or SCR sought to be tested is forwardly or reversely biased, when said switch means is in said second position, said first indicator means and said second indicator means indicating whether the apparatus is properly operating when said switch means is in its first position; and g. overload protection means for protecting said first and second indicator means when said power supply means supplies a voltage above a given level by connecting additional impedance in series with said first and second indicator means whereby said apparatus continues to operate in a normal fashion.
Claim 3
Dependent Claim
65 words
The appratus as set forth in claim 1 wherein said overload protection means comprises: a. relay means, said relay means being energized when said power supply means supplies a voltage above said predetermined level; b. resistance means; and c. first contact means associated with said relay means for placing said resistance means in series with said second indicator means when said relay means is energized.
Claim 4
Dependent Claim
46 words
The apparatus as set forth in claim 2 wherein said first indicator means comprises a first and second lamp and wherein said overload protection means includes second contact means for connecting said second lamp in series with said first lamp when said relay means is energized.
Claim 5
Dependent Claim
55 words
The apparatus as set forth in claim 1 wherein said second indicator means comprises: a. first lamp means, said first lamp means turning ON when said device under test is forward biased and ON; and b. second lamp means, said second lamp means turning ON when said device under test is reverse biased and ON.
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) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |