Patent US5397999A successfully refreshed from Google Patents.
US5397999A
Expired / Lapsed
US
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Evaluation apparatus for power supply system
Assignee: PFU Ltd
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Filing: 1992-07-29
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Granted: 1995-03-14
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Expires: 2012-07-29
Abstract
Abstract In an evaluation apparatus for measuring the fluctuation of a voltage and a current on a power supply line and evaluating the result of the measurement, the apparatus includes: a dummy load connected to the power supply line instead of an actual function unit to measure the fluctuation of the voltage and the current on the power supply line; and a switch connected to the dummy load for turning ON/OFF the dummy load instead of performing an inserting/removing operation thereof. Further, the above switch can replace to a switching control circuit connected to the dummy load for continuously switching turning ON/OFF state of the dummy load instead of repeatedly performing an inserting/removing operation of the dummy load.
Inventors
- 👤 Kouji Kanamaru
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:03
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/40; H; H02; H02H; H02H9/00; H02H9/001; H02H9/004
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
147 words
An evaluation apparatus for measuring the fluctuation of a voltage and a current on a power supply line and evaluating the result of said measurement, comprising: a dummy load connected to the power supply line to measure the fluctuation of the voltage and the current on the power supply line, said dummy load comprising: a capacitive load, a resistive load connected in parallel with said capacitive load, a current control circuit, connected to said capacitive load and to said resistive load, which controls the current flow to said capacitive load and said resistive load, and a time constant circuit connected to said current control circuit for controlling the flow of current to said current control circuit; and a switch connected to said dummy load for turning ON/OFF said dummy load and thereby simulating an operation of inserting/removing the dummy load to and from the power supply line.
Claim 2
Dependent Claim
147 words
An evaluation apparatus for measuring the fluctuation of a voltage and a current on a power supply line and evaluating the result of said measurement, comprising: a dummy load connected to the power supply line to measure the fluctuation of the voltage and the current on the power supply line, said dummy load comprising: a capacitive load, a resistive load connected in parallel with said capacitive load, a current control circuit, connected to said capacitive load and to said resistive load, which controls the current flow to said capacitive load and said resistive load, and a time constant circuit connected to said current control circuit for controlling the flow of current to said current control circuit; and a switch connected to said dummy load for turning ON/OFF said dummy load and thereby simulating an operation of inserting/removing the dummy load to and from the power supply line.
Claim 3
Dependent Claim
38 words
An evaluation apparatus as claimed in claim 1, wherein said dummy load further comprises: a load voltage setting circuit, connected between the current control circuit and the capacitive and resistive loads, which sets the voltage across the loads.
Claim 4
Dependent Claim
23 words
An evaluation apparatus as claimed in claim 2, wherein said load voltage setting circuit comprises a resistor connected in series to the loads.
Claim 5
Dependent Claim
56 words
An evaluation apparatus as recited in claim 1, wherein: said switch comprises a switching control circuit connected to said dummy load for continuously turning ON/OFF said dummy load and thereby changing the ON/OFF state of said dummy load and correspondingly thereby simulating continuous operations of inserting/removing the dummy load to and from the power supply line.
Claim 6
Dependent Claim
92 words
An evaluation apparatus as claimed in claim 5, wherein said dummy load further comprises: a plurality of parallel-connected capacitive load modules; a plurality of parallel-connected resistive load modules; a current control circuit connected to said plurality of parallel-connected capacitive load modules and said plurality of parallel-connected resistive load modules, said current control circuit controlling a current to said plurality of parallel-connected capacitive load modules and said plurality of parallel-connected resistive load modules; and a time constant circuit connected to said current control circuit which controls the current to said current control circuit.
Claim 7
Dependent Claim
113 words
An evaluation apparatus as claimed in claim 4, wherein said switching control circuit further comprises: a first switch which selects a single pulse mode; a second switch which selects a continuous pulse mode; an oscillator which generates a continuous clock signal; three D-type flip-flop circuits which shift an ON signal from said first switch in response to said clock signal from said oscillator; a J-type flip-flop circuit which generates an inverted clock signal in response to said clock signal from said oscillator; a first NAND gate connected to said first switch through said three D-type flip-flop circuits; and a second NAND gate connected to said second switch and to said J-type flip-flop circuit.
References Cited (Backward Citations)
EP0017608A2
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US4357574A
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GB2155257A
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GB2167869A
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GB2213600A
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US4926281A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-03-13 | 1998-09-12 | 1999-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-13 | 2002-09-12 | 2003-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-13 | 2006-09-12 | 2007-03-14 | $7700.00 | Window Closed / Lapsed |