Patent US6060866A successfully refreshed from Google Patents.
US6060866A
Expired / Lapsed
US
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Power control system for vehicle ac generator
Assignee: Denso Corp
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Filing: 1998-11-03
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Granted: 2000-05-09
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Expires: 2018-11-03
Abstract
Abstract In a power control system for a vehicle battery charging ac generator that has a switching element for turning on or off field current, the switching element is turned on at a first duty cycle less than a sum of a predetermined value and a value inversely proportional to rotation speed of the ac generator if the rotation speed is higher than a predetermined speed and at a second duty cycle more than 100% if the rotation speed is not higher than the predetermined speed.
Inventors
- 👤 Takeshi Sada
- 👤 Toshinori Maruyama
- 👤 Tadashi Uematsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:23
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/14; H02J7/16; H02J7/24; H02J7/2434; Y; Y02; Y02T; Y02T10/00; Y02T10/80; Y02T10/92
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
96 words
A power control system for a vehicle battery charging ac generator having a field coil and a rectifier unit, said power control system comprising: a switching element for turning on or off current supplied to said field coil; and means for controlling said switching element to turn on at a first duty cycle less than a ratio inversely proportional to rotation speed of said ac generator when said rotation speed is higher than a predetermined speed and at a second duty cycle more than 100% when said rotation speed is not higher than said predetermined speed.
Claim 2
Dependent Claim
96 words
A power control system for a vehicle battery charging ac generator having a field coil and a rectifier unit, said power control system comprising: a switching element for turning on or off current supplied to said field coil; and means for controlling said switching element to turn on at a first duty cycle less than a ratio inversely proportional to rotation speed of said ac generator when said rotation speed is higher than a predetermined speed and at a second duty cycle more than 100% when said rotation speed is not higher than said predetermined speed.
Claim 3
Dependent Claim
32 words
The power control system as claimed in claim 1, wherein said first duty cycle is proportional to a sum of a predetermined value and a value inversely proportional to said rotation speed.
Claim 4
Dependent Claim
62 words
The power control system as claimed in claim 2, wherein said first duty cycle is a ratio to control so that output power of said ac generator at a speed higher than said predetermined speed is more than normal output power at a speed lower than said predetermined speed and less than a value that is 10% more than said normal power.
Claim 5
Dependent Claim
84 words
The power control system as claimed in claim 1, wherein said means comprises: a first pulse generator for generating first pulses at a fixed cycle time; a counter for counting said first pulses in a period inversely proportional to said rotation speed; an adder for providing a sum of the number of said first pulses counted by said first counter and a predetermined value; a latch circuit for memorizing said sum; and a maximum duty-cycle-setting circuit for providing a ratio proportional to said sum.
Claim 6
Dependent Claim
50 words
The power control system as claimed in claim 1, wherein said duty-cycle-setting circuit comprises: a field current detecting circuit for providing a value proportional to said current supplied to said field coil; and a comparator circuit for turning off said switching element when said value is larger than said ratio.
Claim 7
Dependent Claim
42 words
The power control system as claimed in claim 1 further comprising a voltage regulator commonly having said switching element, wherein said means turns off said switching element regardless of said voltage regulator when said rotation speed is higher than said predetermined speed.
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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) | 2003-05-09 | 2003-11-08 | 2004-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-05-09 | 2007-11-08 | 2008-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-05-09 | 2011-11-08 | 2012-05-09 | $7700.00 | Window Closed / Lapsed |