US3845379A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chopper circuit for d.c. motor
Assignee: Meidensha Corp
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Filing: 1973-09-28
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Granted: 1974-10-29
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Expires: 1993-09-28
Abstract
Abstract An improved chopper circuit for controlling a direct-current motor having a free-wheeling diode, comprising an oscillating circuit consisting of a series combination of a reactor and a capacitor and a switching element. A coil is serially connected to the free-wheeling diode of the motor and is magnetically connected to the reactor and transmits the energy stored thereon by the free-wheeling diode to the reactor for causing the charged voltage of the capacitor to become higher than that achieved in a prior art chopper circuit.
Inventors
- 👤 M Kawamata
- 👤 M Ozeki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:29
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/29; B; B60; B60L; B60L15/00; B60L15/02; B60L15/08; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/64; Y02T10/72; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/917
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
114 words
A chopper circuit for controlling a direct-current motor having a free-wheeling diode serially connected at one end to a direct-current power source and at the other end to said chopper circuit, which chopper circuit comprises switching means serially connected at one end to said motor and at the other end to said power source, said switching means becoming conducting when subjected to a positive potential higher than a predetermined level and non-conducting when subjected to a negative potential, a combination of an inductive reactor and a capacitor serially connected to each other and shunting said switching means, and a coil electrically connected in series with said free-wheeling diode and magnetically connected to said reactor.
Claim 2
Dependent Claim
114 words
A chopper circuit for controlling a direct-current motor having a free-wheeling diode serially connected at one end to a direct-current power source and at the other end to said chopper circuit, which chopper circuit comprises switching means serially connected at one end to said motor and at the other end to said power source, said switching means becoming conducting when subjected to a positive potential higher than a predetermined level and non-conducting when subjected to a negative potential, a combination of an inductive reactor and a capacitor serially connected to each other and shunting said switching means, and a coil electrically connected in series with said free-wheeling diode and magnetically connected to said reactor.
Claim 3
Dependent Claim
61 words
A chopper circuit as set forth in claim 1, further comprising a diode serially connected to that terminal of said reactor which is opposite to the terminal connected to said capacitor, and second switching means having operating characteristics similar to those of the first-named switching means and shunting said reactor and said diode serially connected to said terminal of said reactor.
Claim 4
Dependent Claim
18 words
A chopper circuit as set forth in claim 1, wherein said switching means comprise a silicon controlled rectifier.
Claim 5
Dependent Claim
21 words
A chopper circuit as set forth in claim 1, wherein said reactor is connected to said coil through a magnetic linkage.
Claim 6
Dependent Claim
27 words
A chopper circuit as set forth in claim 2, wherein each of the first named switching means and said second switching means comprise a silicon controlled rectifier.
Claim 7
Dependent Claim
23 words
A chopper circuit as set forth in claim 3, wherein said silicon controlled rectifier has a gate terminal connected to a pulse generator.
Claim 8
Dependent Claim
17 words
A chopper circuit as set forth in claim 4, wherein said magnetic linkage comprises an iron core.
Claim 9
Dependent Claim
21 words
A chopper circuit as set forth in claim 1, wherein said free-wheeling diode, said capacitor, and said reactor are serially connected.
References Cited (Backward Citations)
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US3594629A
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US3619753A
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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) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |