US3881141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regenerative brake control circuit
Assignee: Hitachi Ltd
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Filing: 1974-01-25
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Granted: 1975-04-29
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Expires: 1994-01-25
Abstract
Abstract There is disclosed a low-cost regenerative brake control circuit used for electric cars and the like which is capable of effecting regenerative braking on motors continuously over the range from a speed higher than the rated speed of the motors to a low speed and which comprises two motor circuits each including a seriesconnected motor and a reactor, each motor circuit being connected in parallel with a common chopper through a thyristor.
Inventors
- 👤 Hiroshi Narita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:30
CPC Classifications
H; H02; H02P; H02P3/00; H02P3/06; H02P3/08; H02P3/14
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
139 words
A regenerative brake control circuit for a plurality of motors, comprising a plurality of reactors each connected in series with each of said plurality of motors, a plurality of switching means, one end of each of said switchinG means being connected to one end of said series circuit including said motor and reactor, a chopper circuit having one end thereof connected electrically to the other end of each of said switching means, the other end of said chopper circuit being electrically connected to the other end of each of said series circuits including motor and reactor, and a plurality of source current blocking means through which said motor circuits are connected to a power supply, said source current blocking means preventing the source voltage from being applied to said chopper circuit during the conducting period of said chopper circuit.
Claim 2
Dependent Claim
139 words
A regenerative brake control circuit for a plurality of motors, comprising a plurality of reactors each connected in series with each of said plurality of motors, a plurality of switching means, one end of each of said switchinG means being connected to one end of said series circuit including said motor and reactor, a chopper circuit having one end thereof connected electrically to the other end of each of said switching means, the other end of said chopper circuit being electrically connected to the other end of each of said series circuits including motor and reactor, and a plurality of source current blocking means through which said motor circuits are connected to a power supply, said source current blocking means preventing the source voltage from being applied to said chopper circuit during the conducting period of said chopper circuit.
Claim 3
Dependent Claim
19 words
A regenerative brake control circuit according to claim 1, in which each of said switching means comprises a thyristor.
Claim 4
Dependent Claim
118 words
A regenerative brake control circuit according to claim 2, in which said plurality of series circuits comprise a first and a second series circuits each including a motor and a reactor in series, said regenerative brake control circuit further comprising a reverse current blocking means for allowing current to flow only in one direction, said reverse current blocking means being inserted between said other end of said chopper circuit and said other end of said second series circuit, a breaker means being connected between said other end of said second series circuit and said one end of said first series circuit, said breaker means being closed when the speed of said motors is reduced below a predetermined level.
Claim 5
Dependent Claim
27 words
A regenerative brake control circuit according to claim 2, in which means are provided for connecting the motor side terminals of said plurality of reactors in common.
Claim 6
Dependent Claim
57 words
A regenerative brake control circuit according to claim 4, in which there is provided a second reverse current blocking means inserted between the reactor side terminal of said motor of said first motor circuit and said reactor of said first motor circuit, said second reverse current blocking means allowing the passage of current in only one direction.
Claim 7
Dependent Claim
65 words
A regenerative brake control circuit according to claim 5, in which there is provided a second breaker means inserted between the reactor side terminal of said second motor circuit and said chopper circuit, said second breaker means being connected in parallel with said thyristors and operatively interlocked with said first breaker means so as to be opened or closed concurrently with said first breaker means.
Claim 8
Dependent Claim
24 words
A regenerative brake control circuit according to claim 6, in which each of said first and second reverse current blocking means comprises a diode.
References Cited (Backward Citations)
US3651388A
Cited
US3800197A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |