US4258307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage control apparatus for a vehicle-mounted alternator
Assignee: Denso Corp
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Filing: 1979-07-03
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Granted: 1981-03-24
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Expires: 1999-07-03
Abstract
Abstract When an engine key switch of a vehicle is closed, a rotor coil of a three-phase a.c. alternator adapted to charge a vehicle-mounted battery is excited by a first controlling circuit. Even with the closure of the engine key switch, the exciting current is restricted to a predetermined value by a second controlling circuit before the alternator has reached a predetermined operating state. The operating state of the alternator is monitored by detecting a voltage at the neutral point of a stator coil connected in star of the alternator.
Inventors
- 👤 Kazumasa Mori
- 👤 Taro Asahi
- 👤 Keiichiro Banzai
- 👤 Katsutaro Iwaki
- 👤 Katsuya Muto
- 👤 Akira Mase
- 👤 Takayasu Nimura
- 👤 Katsumi Itoh
- 👤 Yoshio Akita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:27
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/14; H02J7/16; H02J7/163
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
165 words
A voltage control apparatus for a vehicle-mounted alternator which includes an armature coil, an exciting coil and means for rectifying an a.c. output of said armature coil, comprising: means connected to said exciting coil, for controlling the magnitude of a current flowing through said exciting coil, said current control means having an active region; first means connected to said current control means and an engine key switch of a vehicle, responsive to closure of said key switch for controlling said current control means; second means connected to said current control means and said exciting coil, for maintaining said current control means to be at a predetermined active state irrespective of said first means; means connected to said alternator, for detecting the operating state of said alternator to produce a detection signal when said alternator has reached a predetermined operating state; and means connected between said detecting means and said second means, for disabling the operation of said second means in response to said detection signal.
Claim 2
Dependent Claim
165 words
A voltage control apparatus for a vehicle-mounted alternator which includes an armature coil, an exciting coil and means for rectifying an a.c. output of said armature coil, comprising: means connected to said exciting coil, for controlling the magnitude of a current flowing through said exciting coil, said current control means having an active region; first means connected to said current control means and an engine key switch of a vehicle, responsive to closure of said key switch for controlling said current control means; second means connected to said current control means and said exciting coil, for maintaining said current control means to be at a predetermined active state irrespective of said first means; means connected to said alternator, for detecting the operating state of said alternator to produce a detection signal when said alternator has reached a predetermined operating state; and means connected between said detecting means and said second means, for disabling the operation of said second means in response to said detection signal.
Claim 3
Dependent Claim
21 words
An apparatus according to claim 1, wherein said detecting means detects a voltage at the neutral point of said armature coil.
Claim 4
Dependent Claim
15 words
An apparatus according to claim 1 or 2, wherein said second means includes a transistor.
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) | 1984-03-23 | 1984-09-22 | 1985-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-23 | 1988-09-22 | 1989-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-23 | 1992-09-22 | 1993-03-24 | $7700.00 | Window Closed / Lapsed |