US5694310A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Three phase input boost converter
Assignee: International Business Machines Corp
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Filing: 1995-08-14
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Granted: 1997-12-02
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Expires: 2015-08-14
Abstract
Abstract A three phase input, boost power supply comprises first, second and third rectifiers for respective phases of the three phase input. First, second and third boost inductors are interposed between the first, second and third rectifiers, respectively and respective phases of said three phase input. A low pass filter is interposed between the boost inductors and the three phase input. A chopping switch is connected to an output of at least one of the rectifiers in parallel with a load to boost a voltage of the load. A current sensor is connected between the rectifier output and the load. The switch is activated in response to the current sensor sensing approximately zero current flow. The subsequent rate of current rise is proportional to the magnitude of the input voltage. The switch is deactivated based in part on a comparison of the load voltage to a reference voltage. Thus, the input current for each phase has nearly unity power factor, even when one phase drops out.
Inventors
- 👤 Randhir Singh Malik
- 👤 Ronnie Arno Wunderlich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:06
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/42; H02M1/4208; H02M1/4216; Y; Y02; Y02B; Y02B70/00; Y02B70/10; Y02P; Y02P80/00; Y02P80/10
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
124 words
A three phase input, boost power supply comprising: first, second and third rectifiers having first, second and third respective cathodes connected together; first, second and third boost inductors interposed between anodes of said first, second and third rectifiers, respectively and respective phases of said three phase input; a diode having a cathode coupled to a load; a current sensor connected between an anode of said diode and said first, second and third cathodes; a chopping switch connected to said first, second and third cathodes such that when active said switch shunts current away from said load and when inactive said switch boosts a voltage of said load; and means for activating said switch in response to said current sensor sensing approximately zero current flow.
Claim 2
Dependent Claim
124 words
A three phase input, boost power supply comprising: first, second and third rectifiers having first, second and third respective cathodes connected together; first, second and third boost inductors interposed between anodes of said first, second and third rectifiers, respectively and respective phases of said three phase input; a diode having a cathode coupled to a load; a current sensor connected between an anode of said diode and said first, second and third cathodes; a chopping switch connected to said first, second and third cathodes such that when active said switch shunts current away from said load and when inactive said switch boosts a voltage of said load; and means for activating said switch in response to said current sensor sensing approximately zero current flow.
Claim 3
Dependent Claim
29 words
A power supply as set forth in claim 1 further comprising a low pass filter interposed between said three phase input and said first, second and third boost inductors.
Claim 4
Dependent Claim
54 words
A power supply as set forth in claim 2 wherein said low pass filter comprises fourth, fifth and sixth inductors interposed between said first, second and third boost inductors, respectively and the respective input phases, and first, second and third capacitors each connected between a different pair of the fourth, fifth and sixth inductors.
Claim 5
Dependent Claim
28 words
A power supply as set forth in claim 1 further comprising means for deactivating said switch based on a comparison of said load voltage to a reference voltage.
Claim 6
Dependent Claim
19 words
A power supply as set forth in claim 1 further comprising an output capacitor in parallel with said load.
Claim 7
Dependent Claim
35 words
A power supply as set forth in claim 1 further comprising means for deactivating said switch based on a comparison of a ramp voltage to a difference between said load voltage and a reference voltage.
Claim 8
Dependent Claim
36 words
A power supply as set forth in claim 1 further comprising fourth, fifth and sixth rectifiers connected with said first, second and third rectifiers, respectively to full wave rectify respective phases of said three phase input.
Claim 9
Dependent Claim
59 words
A power supply as set forth in claim 1 wherein: said current sensor comprises a transformer having a primary winding connected between said anode of said diode and said first, second and third cathodes; and the activating means comprises a control for said switch and a second diode interposed between said control and a secondary winding of said transformer.
Claim 10
Dependent Claim
44 words
A power supply as set forth in claim 8 wherein said activating means further comprises a comparator having a first input coupled to said secondary winding and a cathode of said second diode, an anode of said second diode being coupled to said control.
Claim 11
Dependent Claim
36 words
A power supply as set forth in claim 1 further comprising means for controlling a duration that said switch is active based on a voltage of said load to maintain said voltage at a rated level.
Claim 12
Independent Claim
152 words
A method for supplying a boosted DC voltage from a three phase input, said method comprising: providing first, second and third full wave rectifiers for respective phases of said input, outputs of said first, second and third full wave rectifiers being connected together; interposing first, second and third boost inductors between said first, second and third full wave rectifiers, respectively and respective phases of said three phase input; connecting a switch to said outputs of said full wave rectifiers, when active said switch shunting current from said load and when inactive said switch boosting a voltage of said load; connecting a cathode of a diode to the load, an anode of said diode being coupled to said full wave rectifier outputs; sensing a current from said full wave rectifier outputs en route to said load via said diode; and activating said switch approximately when said current sensor senses approximately zero current flow.
Claim 13
Independent Claim
152 words
A method for supplying a boosted DC voltage from a three phase input, said method comprising: providing first, second and third full wave rectifiers for respective phases of said input, outputs of said first, second and third full wave rectifiers being connected together; interposing first, second and third boost inductors between said first, second and third full wave rectifiers, respectively and respective phases of said three phase input; connecting a switch to said outputs of said full wave rectifiers, when active said switch shunting current from said load and when inactive said switch boosting a voltage of said load; connecting a cathode of a diode to the load, an anode of said diode being coupled to said full wave rectifier outputs; sensing a current from said full wave rectifier outputs en route to said load via said diode; and activating said switch approximately when said current sensor senses approximately zero current flow.
Claim 14
Dependent Claim
31 words
A method as set forth in claim 11 further comprising the step of interposing a low pass filter between said three phase input and said first, second and third boost inductors.
Claim 15
Dependent Claim
35 words
A method as set forth in claim 11 further comprising the step of deactivating said switch based on a comparison of a ramp voltage to a difference between said load voltage and a reference voltage.
References Cited (Backward Citations)
US3919656A
Cited
US4195333A
Cited
US4384321A
Cited
US4449174A
Cited
US4535399A
Cited
US4748397A
Cited
US4719552A
Cited
US4712169A
Cited
US4709316A
Cited
US4717884A
Cited
US4677366A
Cited
US4700285A
Cited
US4812959A
Cited
US4774649A
Cited
US4901214A
Cited
US4800477A
Cited
US4942509A
Cited
US4807106A
Cited
US4974141A
Cited
US5001620A
Cited
US5045989A
Cited
US4855888A
Cited
US4891746A
Cited
US4937728A
Cited
US4992723A
Cited
US5034874A
Cited
US4940929A
Cited
US4924371A
Cited
US5180964A
Cited
US5179511A
Cited
US5367247A
Cited
US5508602A
Cited
US5414613A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-12-01 | 2001-06-02 | 2001-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-12-01 | 2005-06-02 | 2005-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-12-01 | 2009-06-02 | 2009-12-02 | $7700.00 | Window Closed / Lapsed |