US6630751B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Excessive load capacitor detection circuit for UPS
Assignee: Schneider Electric IT Corp
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Filing: 2001-03-19
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Granted: 2003-10-07
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Expires: 2021-03-19
Abstract
Abstract Embodiments of the present invention are directed to an uninterruptible power supply for providing AC power to a load having a capacitive element. In embodiments of the present invention the uninterruptible power supply includes an input to receive AC power from an AC power source, an output that provides AC power, a DC voltage source that provides DC power, the DC voltage source having an energy storage device, an inverter operatively coupled to the DC voltage source to receive DC power and to provide AC power, the inverter including: first and second output nodes to provide AC power to the load having the first capacitive element, first and second input nodes to receive DC power from the DC voltage source, a circuit operatively coupled to the first output node of the inverter, the circuit being configured to compare a value representative of load capacitance of the first capacitive element with a reference value to determine excessive load capacitance, a set of switches operatively coupled between the first and second output nodes and the first and second input nodes and controlled to generate AC power from the DC power, and a transfer switch constructed and arranged to select one of the AC power source and the DC voltage source as an output power source for the uninterruptible power supply.
Inventors
- 👤 Jeffrey Curtis
- 👤 David E. Reilly
- 👤 Kevin White
- 👤 Namwook Paik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:19
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537; H02M7/5383; H02M7/53832; H02J; H02J9/00; H02J9/04; H02J9/06; H02J9/062; Y; Y02; Y02B; Y02B70/00; Y02B70/10
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
205 words
An uninterruptible power supply for providing AC power to a load having a first capacitive element, the uninterruptible power supply comprising: an input to receive AC power from an AC power source; an output that provides AC power; a DC voltage source that provides DC power, the DC voltage source having an energy storage device; an inverter operatively coupled to the DC voltage source to receive DC power and to provide AC power, the inverter including: first and second output nodes to provide AC power to the load having the first capacitive element; first and second input nodes to receive DC power from the DC voltage source; a circuit operatively coupled to the first output node of the inverter, the circuit being configured to compare a value representative of load capacitance of the first capacitive element with a reference value to determine excessive load capacitance; a set of switches operatively coupled between the first and second output nodes and the first and second input nodes and controlled to generate AC power from the DC power; and a transfer switch constructed and arranged to select one of the AC power source and the DC voltage source as an output power source for the uninterruptible power supply.
Claim 2
Dependent Claim
205 words
An uninterruptible power supply for providing AC power to a load having a first capacitive element, the uninterruptible power supply comprising: an input to receive AC power from an AC power source; an output that provides AC power; a DC voltage source that provides DC power, the DC voltage source having an energy storage device; an inverter operatively coupled to the DC voltage source to receive DC power and to provide AC power, the inverter including: first and second output nodes to provide AC power to the load having the first capacitive element; first and second input nodes to receive DC power from the DC voltage source; a circuit operatively coupled to the first output node of the inverter, the circuit being configured to compare a value representative of load capacitance of the first capacitive element with a reference value to determine excessive load capacitance; a set of switches operatively coupled between the first and second output nodes and the first and second input nodes and controlled to generate AC power from the DC power; and a transfer switch constructed and arranged to select one of the AC power source and the DC voltage source as an output power source for the uninterruptible power supply.
Claim 3
Dependent Claim
78 words
The uninterruptible power supply of claim 1 , further comprising: a resonant element having a first terminal and a second terminal, the second terminal being electrically coupled to the first output node of the inverter; and a switch from the set of switches operatively coupled between the first terminal of the resonant element and the second input node, wherein when the switch is selected, the switch couples the resonant element to the first capacitive element of the load.
Claim 4
Dependent Claim
55 words
The uninterruptible power supply of claim 1 , wherein the circuit comprises: a second capacitive element electrically coupled to the first output node to store a voltage of the first capacitive element; and a logic circuit to compare the stored voltage of the first capacitive element with a reference voltage to determine excessive load capacitance.
Claim 5
Dependent Claim
15 words
The uninterruptible power supply of claim 3 , wherein the logic circuit includes a microprocessor.
Claim 6
Dependent Claim
29 words
The uninterruptible power supply of claim 3 , wherein the circuit is configured to store the voltage of the first capactive element during a clamping operation of the inverter.
Claim 7
Dependent Claim
158 words
The uninterruptible power supply of claim 2 , wherein the circuit comprises: a comparator having a first input electrically coupled to receive a reference voltage value and a second input electrically coupled to receive a voltage value stored in the first capacitive element when the first switch is selected to coupled the first capacitive element to the resonant element, the comparator configured to continuously compare the first input value with the second input value, the comparator changing a logic state when the second input value exceeds the first input value; and a logic circuit to measure a time interval between a first time in which the comparator initiates comparison of the first input value with the second input value and a second time in which the second input value exceeds the first input value with a predetermined time interval, the logic circuit determining the load capacitance to be excessive when the time interval exceeds the predetermined time interval.
Claim 8
Dependent Claim
88 words
The uninterruptible power supply of claim 6 , further comprising: a first set of resistors coupled to the first input of the comparator to scale the reference voltage value; and a second set of resistors coupled to the second input of the comparator to scale the first capactive element voltage value, wherein a ratio of the first set of resistors and the second set of resistors determines the value of the second input value with respect to the first input value in which the comparator changes logic state.
Claim 9
Dependent Claim
16 words
The uninterruptible power supply of claim 6 , wherein the reference voltage is the source voltage.
Claim 10
Dependent Claim
15 words
The uninterruptible power supply of claim 6 , wherein the logic circuit is a microprocessor.
Claim 11
Dependent Claim
29 words
The uninterruptible power supply of claim 1 , wherein the circuit is further configured to shutdown the uninterruptible power supply if the circuit determines the load capacitance is excessive.
Claim 12
Dependent Claim
190 words
An uninterruptible power supply for providing AC power to a load having a first capacitive element, the uninterruptible power supply comprising: an input to receive AC power from an AC power source; an output that provides AC power; a DC voltage source that provides DC power, the DC voltage source having an energy storage device; an inverter operatively coupled to the DC voltage source to receive DC power and to provide AC power, the inverter including: first and second output nodes to provide AC power to the load having the first capacitive element; first and second input nodes to receive DC power from the DC voltage source; means for comparing a value representative of load capacitance of the first capacitive element with a reference value to determine excessive load capacitance; a set of switches operatively coupled between the first and second output nodes and the first and second input nodes and controlled to generate AC power from the DC power; and a transfer switch constructed and arranged to select one of the AC power source and the DC voltage source as an output power source for the uninterruptible power supply.
Claim 13
Dependent Claim
190 words
An uninterruptible power supply for providing AC power to a load having a first capacitive element, the uninterruptible power supply comprising: an input to receive AC power from an AC power source; an output that provides AC power; a DC voltage source that provides DC power, the DC voltage source having an energy storage device; an inverter operatively coupled to the DC voltage source to receive DC power and to provide AC power, the inverter including: first and second output nodes to provide AC power to the load having the first capacitive element; first and second input nodes to receive DC power from the DC voltage source; means for comparing a value representative of load capacitance of the first capacitive element with a reference value to determine excessive load capacitance; a set of switches operatively coupled between the first and second output nodes and the first and second input nodes and controlled to generate AC power from the DC power; and a transfer switch constructed and arranged to select one of the AC power source and the DC voltage source as an output power source for the uninterruptible power supply.
Claim 14
Dependent Claim
78 words
The uninterruptible power supply of claim 10 , further comprising: a resonant element having a first terminal and a second terminal, the second terminal being electrically coupled to the first output node of the inverter; and a switch from the set of switches operatively coupled between the first terminal of the resonant element and the second input node, wherein when the switch is selected, the switch couples the resonant element to the first capacitive element of the load.
Claim 15
Dependent Claim
36 words
The uninterruptible power supply of claim 10 , wherein the circuit comprises: means for comparing including means for comparing the stored voltage of the first capacitive element with a reference voltage to determine excessive load capacitance.
Claim 16
Dependent Claim
31 words
The uninterruptible power supply of claim 13 , wherein means for comparing includes meaning for shutting down the uninterruptible power if means for comparing determines that the load capacitance is excessive.
References Cited (Backward Citations)
US4115704A
Cited
US4305033A
Cited
US4473756A
Cited
US4517470A
Cited
US4717998A
Cited
US4827150A
Cited
US5045989A
Cited
US4939633A
Cited
US4916599A
Cited
EP0420628A2
Cited
US5010469A
Cited
US5251121A
Cited
US5274540A
Cited
US5513088A
Cited
US5175155A
Cited
US5680301A
Cited
US5488552A
Cited
US5347164A
Cited
US5517403A
Cited
US5563778A
Cited
US5563777A
Cited
US5686797A
Cited
US5953224A
Cited
EP0696831A2
Cited
US5610805A
Cited
US5602462A
Cited
US5760495A
Cited
US5561595A
Cited
US5557175A
Cited
US5525869A
Cited
US6111606A
Cited
US5635773A
Cited
US5646835A
Cited
US5784270A
Cited
US5774351A
Cited
US5781399A
Cited
US5734565A
Cited
US6184662B1
Cited
US6404658B1
Cited
US6532160B2
Cited
US6278245B1
Cited
US6343021B1
Cited
US6353337B2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2006-10-06 | 2007-04-07 | 2007-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-10-06 | 2011-04-07 | 2011-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-10-06 | 2015-04-07 | 2015-10-07 | $7700.00 | Window Closed / Lapsed |