US5886893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable power unit using a cycloconverter for generating a high power single-phase alternating current
Assignee: Honda Motor Co Ltd
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Filing: 1997-06-25
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Granted: 1999-03-23
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Expires: 2017-06-25
Abstract
Abstract A portable power unit has a magneto generator having three-phase output windings. A synchronizing signal is formed in synchronism with an output frequency of the magneto generator. A pair of variable control bridge circuits are connected to the three-phase output windings and connected in antiparallel connection to each other to form a cycloconverter for generating a single-phase alternating current having a desired frequency to be supplied to a load. A bridge drive circuit is responsive to the synchronizing signal from the synchronizing signal-forming circuit, for causing the pair of variable control bridge circuits to be alternately switched to operate every half a repetition period of the single-phase alternating current, to thereby cause the cycloconverter to generate the single-phase alternating current. An output voltage-detecting circuit detects an output voltage of the pair of variable control bridge circuits. An output voltage-adjusting circuit compares the output voltage detected by the output voltage-detecting circuit with a desired voltage to thereby control the bridge drive circuit in a manner such that the output voltage of the pair of variable control bridge circuits is maintained substantially at a fixed value.
Inventors
- 👤 Koichi Asai
- 👤 Motohiro Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:50
CPC Classifications
H; H02; H02M; H02M5/00; H02M5/02; H02M5/04; H02M5/22; H02M5/25; H02M5/27; H02M5/271
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
193 words
A portable power unit comprising: a magneto generator having three-phase output windings; a synchronizing signal-forming circuit for forming a synchronizing signal in synchronism with an output frequency of said magneto generator; a pair of variable control bridge circuits connected to said three-phase output windings and connected in an antiparallel manner to each other to form a cycloconverter for generating a single-phase alternating current to be supplied to a load, said single-phase alternating current having a desired frequency; a bridge drive circuit responsive to said synchronizing signal from said synchronizing signal-forming circuit, for causing said pair of variable control bridge circuits to be alternately switched to operate every half a repetition period of said single-phase alternating current, to thereby cause said cycloconverter to generate said single-phase alternating current; an output voltage-detecting circuit for detecting an output voltage of said pair of variable control bridge circuits; and an output voltage-adjusting circuit for comparing said output voltage detected by said output voltage-detecting circuit with a desired voltage, and for controlling said bridge drive circuit based on said comparison in a manner such that said output voltage of said pair of variable control bridge circuits is stabilized.
Claim 2
Dependent Claim
193 words
A portable power unit comprising: a magneto generator having three-phase output windings; a synchronizing signal-forming circuit for forming a synchronizing signal in synchronism with an output frequency of said magneto generator; a pair of variable control bridge circuits connected to said three-phase output windings and connected in an antiparallel manner to each other to form a cycloconverter for generating a single-phase alternating current to be supplied to a load, said single-phase alternating current having a desired frequency; a bridge drive circuit responsive to said synchronizing signal from said synchronizing signal-forming circuit, for causing said pair of variable control bridge circuits to be alternately switched to operate every half a repetition period of said single-phase alternating current, to thereby cause said cycloconverter to generate said single-phase alternating current; an output voltage-detecting circuit for detecting an output voltage of said pair of variable control bridge circuits; and an output voltage-adjusting circuit for comparing said output voltage detected by said output voltage-detecting circuit with a desired voltage, and for controlling said bridge drive circuit based on said comparison in a manner such that said output voltage of said pair of variable control bridge circuits is stabilized.
Claim 3
Dependent Claim
70 words
A portable power unit according to claim 1, wherein said magneto generator comprises: a magnet rotor, a stator having a plurality of magnet poles, said magnet poles including a first set of magnet poles around which said three-phase output windings are wound, and a second set of magnet poles, and signal windings wound around said second set of magnet poles, said signal windings being coupled to said synchronizing signal-forming circuit.
Claim 4
Dependent Claim
28 words
A portable power unit according to claim 2, wherein said magneto generator is driven by an internal combustion engine which utilizes said magnet rotor as a fly wheel.
Claim 5
Dependent Claim
171 words
A portable power unit comprising: a magneto generator having three-phase output windings; a pair of variable control bridge circuits connected to said three-phase output windings and connected in an antiparallel manner to each other to form a cycloconverter for generating a single-phase alternating current to be supplied to a load, said single-phase alternating current having a desired frequency; a bridge drive circuit for causing said pair of variable control bridge circuits to be alternately switched to operate every half a repetition period of said single-phase alternating current, to thereby cause said cycloconverter to generate said single-phase alternating current; an output voltage-detecting circuit for detecting an output voltage of said pair of variable control bridge circuits; and waveform-forming means for forming a waveform of said output voltage of said pair of variable control bridge circuits in a manner such that said waveform changes from a sinusoidal waveform to a rectangular waveform whose maximum amplitude is limited by said output voltage of said set of variable control bridge circuits, as said load increases.
Claim 6
Dependent Claim
171 words
A portable power unit comprising: a magneto generator having three-phase output windings; a pair of variable control bridge circuits connected to said three-phase output windings and connected in an antiparallel manner to each other to form a cycloconverter for generating a single-phase alternating current to be supplied to a load, said single-phase alternating current having a desired frequency; a bridge drive circuit for causing said pair of variable control bridge circuits to be alternately switched to operate every half a repetition period of said single-phase alternating current, to thereby cause said cycloconverter to generate said single-phase alternating current; an output voltage-detecting circuit for detecting an output voltage of said pair of variable control bridge circuits; and waveform-forming means for forming a waveform of said output voltage of said pair of variable control bridge circuits in a manner such that said waveform changes from a sinusoidal waveform to a rectangular waveform whose maximum amplitude is limited by said output voltage of said set of variable control bridge circuits, as said load increases.
Claim 7
Dependent Claim
44 words
A portable power unit according to claim 4, wherein said magneto generator comprises a magnet rotor and a stator having a plurality of magnet poles, said magneto generator being driven by an internal combustion engine which utilizes said magnet rotor as a fly wheel.
Claim 8
Dependent Claim
147 words
A portable power unit comprising: a magneto generator having three-phase output windings; a pair of variable control bridge circuits connected to said three-phase output windings and connected in an antiparallel manner to each other to form a cycloconverter for generating a single-phase alternating current to be supplied to a load, said single-phase alternating current having a desired frequency; a bridge drive circuit for causing said pair of variable control bridge circuits to be alternately switched to operate every half a repetition period of said single-phase alternating current, to thereby cause said cycloconverter to generate said single-phase alternating current; and desired waveform-forming means for forming a desired waveform of a drive signal for operating said pair of variable control bridge circuits to generate said single-phase alternating current, in a manner such that said desired waveform changes from a sinusoidal waveform to a rectangular waveform as said load increases.
Claim 9
Dependent Claim
147 words
A portable power unit comprising: a magneto generator having three-phase output windings; a pair of variable control bridge circuits connected to said three-phase output windings and connected in an antiparallel manner to each other to form a cycloconverter for generating a single-phase alternating current to be supplied to a load, said single-phase alternating current having a desired frequency; a bridge drive circuit for causing said pair of variable control bridge circuits to be alternately switched to operate every half a repetition period of said single-phase alternating current, to thereby cause said cycloconverter to generate said single-phase alternating current; and desired waveform-forming means for forming a desired waveform of a drive signal for operating said pair of variable control bridge circuits to generate said single-phase alternating current, in a manner such that said desired waveform changes from a sinusoidal waveform to a rectangular waveform as said load increases.
Claim 10
Dependent Claim
67 words
A portable drive unit according to claim 6, wherein said desired wave-forming means changes an amplitude of said desired waveform based on a of comparison of an output voltage of said cycloconverter to a set voltage, and changes said desired waveform from said sinusoidal waveform to said rectangular waveform by limiting said amplitude of said desired waveform to a predetermined upper limit and a predetermined lower limit.
Claim 11
Dependent Claim
44 words
A portable power unit according to claim 7, wherein said magneto generator comprises a magnet rotor and a stator having a plurality of magnet poles, said magneto generator being driven by an internal combustion engine which utilizes said magnet rotor as a fly wheel.
Claim 12
Dependent Claim
192 words
A portable power unit comprising: a magneto generator having three-phase output windings, said three-phase output windings having a neutral point; a synchronizing signal-forming circuit for forming a synchronizing signal in synchronism with an output frequency of said magneto generator; a pair of variable control bridge circuits connected to said three-phase output windings and connected in an antiparallel manner to each other to form a cycloconverter for generating a single-phase alternating current to be supplied to a load, said single-phase alternating current, said cycloconverter having an output for outputting a single-phase alternating current, said output of said cycloconverter having a neutral point, said pair of variable control bridge circuits each having a two-layered structure of two half-wave converters, said neutral point of said output of said cycloconverter being connected to said neutral point of said three-phase output windings such that said pair of variable control bridge circuits operate as a voltage doubler rectifier; and a bridge drive for causing said pair of variable control bridge circuits to be alternately switched to operate every half a repetition period of said single-phase alternating current, to thereby cause said cycloconverter to generate said single-phase alternating current.
Claim 13
Dependent Claim
192 words
A portable power unit comprising: a magneto generator having three-phase output windings, said three-phase output windings having a neutral point; a synchronizing signal-forming circuit for forming a synchronizing signal in synchronism with an output frequency of said magneto generator; a pair of variable control bridge circuits connected to said three-phase output windings and connected in an antiparallel manner to each other to form a cycloconverter for generating a single-phase alternating current to be supplied to a load, said single-phase alternating current, said cycloconverter having an output for outputting a single-phase alternating current, said output of said cycloconverter having a neutral point, said pair of variable control bridge circuits each having a two-layered structure of two half-wave converters, said neutral point of said output of said cycloconverter being connected to said neutral point of said three-phase output windings such that said pair of variable control bridge circuits operate as a voltage doubler rectifier; and a bridge drive for causing said pair of variable control bridge circuits to be alternately switched to operate every half a repetition period of said single-phase alternating current, to thereby cause said cycloconverter to generate said single-phase alternating current.
Claim 14
Dependent Claim
61 words
A portable power unit according to claim 9, including control means for comparing waveforms of output voltages of said two half-wave converters of said pair of variable control bridge circuits with respective desired waveforms, to thereby control said two half-wave converters such that said waveforms of said output voltages of said two half-wave converters become close to said respective desired waveforms.
Claim 15
Dependent Claim
44 words
A portable power unit according to claim 10, wherein said magneto generator comprises a magnet rotor and a stator having a plurality of magnet poles, said magneto generator being driven by an internal combustion engine which utilizes said magnet rotor as a fly wheel.
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) | 2002-03-22 | 2002-09-21 | 2003-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-03-22 | 2006-09-21 | 2007-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-03-22 | 2010-09-21 | 2011-03-23 | $7700.00 | Window Closed / Lapsed |