Patent US6137700A successfully refreshed from Google Patents.
US6137700A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Converter with a high power factor using a DC center point voltage
Assignee: Daikin Industries Ltd
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Filing: 1999-04-12
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Granted: 2000-10-24
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Expires: 2019-04-12
Abstract
Abstract Switching control is remarkably simplified and a DC voltage is boosted, and then, an input power factor is sufficiently improved and harmonics are reduced by connecting a full-wave rectifier circuit to an AC power source through a reactor, and connecting a smoothing capacitor and boosting capacitors, which are connected in series with each other, in parallel between the output terminals of the circuit. In addition, a switching device is connected between the input terminal of the circuit and the connecting point between the boosting capacitors, and a control device is provided to control the switching device so that the switching device can be switched at every half cycle of the power source voltage.
Inventors
- 👤 Masakazu Iida
- 👤 Reiji Kawashima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:24
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/42; H02M1/4208; H02M1/4216; Y; Y02; Y02B; Y02B70/00; Y02B70/10
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
126 words
A converter comprising: a reactor; a full-wave rectifier circuit having input terminals and output terminals which circuit is connected to an AC power source through the reactor; a smoothing capacitor which is connected between the output terminals of the full-wave rectifier circuit; boosting capacitors, each having a smaller capacitor than said smoothing capacitor, connected in series to each other and connected in parallel to the smoothing capacitor between the output terminals of the full-wave rectifier circuit; switching means connected between the input terminal of the full-wave rectifier circuit and a connecting point between the boosting capacitors, said switching means being a self-arc-extinguishing element; and control means for controlling the switching means so as to perform a switching operation in response to a change in power voltage.
Claim 2
Dependent Claim
126 words
A converter comprising: a reactor; a full-wave rectifier circuit having input terminals and output terminals which circuit is connected to an AC power source through the reactor; a smoothing capacitor which is connected between the output terminals of the full-wave rectifier circuit; boosting capacitors, each having a smaller capacitor than said smoothing capacitor, connected in series to each other and connected in parallel to the smoothing capacitor between the output terminals of the full-wave rectifier circuit; switching means connected between the input terminal of the full-wave rectifier circuit and a connecting point between the boosting capacitors, said switching means being a self-arc-extinguishing element; and control means for controlling the switching means so as to perform a switching operation in response to a change in power voltage.
Claim 3
Dependent Claim
32 words
A converter as set forth in claim 1, wherein the control means controls the switching means so as to perform a switching operation once for every half cycle of the power voltage.
Claim 4
Dependent Claim
42 words
A converter as set forth in claim 2, wherein the control means detects a zero-cross of the power voltage and outputs a control signal for turning the switching means ON for a predetermined time period in response to detection of the zero-cross.
Claim 5
Dependent Claim
37 words
A converter as set forth in claim 2, wherein the control means outputs a control signal for turning the switching means ON for a predetermined time period which includes a zero-cross time for the power voltage therein.
Claim 6
Dependent Claim
42 words
A converter as set forth in claim 4, wherein the control means outputs a control signal for turning the switching means ON for a predetermined time period having a center timing which is coincident to a zero-cross timing of the power voltage.
Claim 7
Dependent Claim
79 words
A converter as set forth in claim 4, wherein the control means outputs a control signal for turning the switching means ON for a predetermined time period which is determined to include a zero-cross timing of the power voltage and is determined so that its advance phase side time period is shorter than its delay phase side time period, both the advance phase side and the delay phase side time periods being determined with respect to the zero-cross timing.
Claim 8
Dependent Claim
28 words
A converter as set forth in claim 6, wherein the control means outputs a control signal for turning the switching means ON for a previously determined time period.
Claim 9
Dependent Claim
57 words
A converter as set forth in claim 6, wherein the control means compares a DC voltage supplied to a load and a DC voltage command value given from the exterior, and outputs a control signal for turning the switching means ON for a predetermined time period which approaches the DC voltage to the DC voltage command value.
Claim 10
Dependent Claim
113 words
A converter comprising: reactors; a three phase full-wave rectifier circuit having input terminals and output terminals which circuit is connected to a three phase power source through the reactors; smoothing capacitors connected in series to one another and connected between the output terminals of the three phase full-wave rectifier circuit; plural switching means each of which is connected between an input terminal of the three phase full-wave rectifier circuit and a connecting point between the smoothing capacitors, each said switching means being a self-arc-extinguishing element; and control means for controlling the switch means so as to perform a switching operation in response to a change in power voltage and/or a change in load.
Claim 11
Dependent Claim
113 words
A converter comprising: reactors; a three phase full-wave rectifier circuit having input terminals and output terminals which circuit is connected to a three phase power source through the reactors; smoothing capacitors connected in series to one another and connected between the output terminals of the three phase full-wave rectifier circuit; plural switching means each of which is connected between an input terminal of the three phase full-wave rectifier circuit and a connecting point between the smoothing capacitors, each said switching means being a self-arc-extinguishing element; and control means for controlling the switch means so as to perform a switching operation in response to a change in power voltage and/or a change in load.
Claim 12
Dependent Claim
138 words
A converter comprising; reactors; a three phase full-wave rectifier circuit having input terminals and output terminals which circuit is connected to a three phase power source through the reactors; boosting capacitors connected in series to one another and connected between the output terminals of the three phase full-wave rectifier circuit; a smoothing capacitor connected in parallel to the boosting capacitors, the smoothing capacitor having capacitance which is greater than the capacitance of the boosting capacitors; plural switching means each of which is connected between an input terminal of the three phase full-wave rectifier circuit and a connecting point between the boosting capacitors, each said switching means being a self-arc-extinuishing element; and control means for controlling the switching means so as to perform a switching operation in response to a cbange in power voltage and/or a change in load.
Claim 13
Dependent Claim
138 words
A converter comprising; reactors; a three phase full-wave rectifier circuit having input terminals and output terminals which circuit is connected to a three phase power source through the reactors; boosting capacitors connected in series to one another and connected between the output terminals of the three phase full-wave rectifier circuit; a smoothing capacitor connected in parallel to the boosting capacitors, the smoothing capacitor having capacitance which is greater than the capacitance of the boosting capacitors; plural switching means each of which is connected between an input terminal of the three phase full-wave rectifier circuit and a connecting point between the boosting capacitors, each said switching means being a self-arc-extinuishing element; and control means for controlling the switching means so as to perform a switching operation in response to a cbange in power voltage and/or a change in load.
Claim 14
Dependent Claim
35 words
A converter as set forth in claim 9 or claim 10, wherein the control means controls the switching means so as to perform a switching operation once for every half cycle of the power voltage.
Claim 15
Dependent Claim
29 words
A converter as set forth in claim 11, wherein the control means determines an ON-time period of the switching means so as to remove or reduce specific harmonics components.
Claim 16
Dependent Claim
31 words
A converter as set forth in claim 12, wherein the control means detects load information and determines a timing for turning the switching means ON in response to the detection value.
Claim 17
Dependent Claim
47 words
A converter as set forth in claim 13, wherein the control means determines an ON-time period of the switching means and a timing for turning the switching means ON so that a fundamental wave of an input current and the power voltage are in a same phase.
Claim 18
Dependent Claim
45 words
A converter as set forth in claim 11, wherein the control means detects a DC voltage, calculates a difference between the detected DC voltage and a DC voltage command value, and determines an ON-time period of the switching means in response to the calculated difference.
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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) | 2003-10-24 | 2004-04-24 | 2004-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-10-24 | 2008-04-24 | 2008-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-10-24 | 2012-04-24 | 2012-10-24 | $7700.00 | Window Closed / Lapsed |