US3617853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Battery voltage regulating system using a transistor switching circuit
Assignee: Denso Corp
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Filing: 1969-07-15
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Granted: 1971-11-02
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Expires: 1989-07-15
Abstract
Abstract This specification discloses improvements in or relating to a power source system comprising a three-phase AC generator, a three-phase full-wave rectifier for rectifying the output from the three-phase AC generator, a battery connected with the output terminal of the three-phase AC generator, and a voltage regulating system for controlling the excitation of the generator so as to maintain the terminal voltage of the battery at a predetermined value. The improvements particularly relate to the voltage regulating system, and lie in that a transistor switching circuit is provided with feedback to cause a switching hysteresis for minimizing high-frequency switching noise while the source voltage of the transistor voltage regulating system which has hitherto been derived from a three-phase full-wave rectifier circuit, is derived from a two-phase full-wave rectifier circuit, to provide a periodic off-time for preventing undue battery voltage deviations that might otherwise be caused by such switching hyteresis and in order to economize the number and size of components to be used, and to improve the regulating characteristic as well as to facilitate the compact construction of the entire system.
Inventors
- 👤 Yohichi Kawashima
- 👤 Hisami Mitsueda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:21
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/32
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
118 words
A battery voltage regulating system comprising a three-phase AC generator having armature windings and a field winding, a three-phase fullwave rectifier for rectifying the three-phase output of said generator and for charging a battery, a transistor switching circuit connected to said field winding for switching the current therethrough and thereby controlling the output of said generator, said transistor switching circuit having a positive feedback circuit means for causing a substantial degree of switching hysteresis theRein, and a two phase rectifier for rectifying only two phases of said generator output and for energizing said switching circuit such that there are periodic off-times of switching circuit energization to minimize undue voltage deviation that might otherwise result from the switching hysteresis.
Claim 2
Dependent Claim
118 words
A battery voltage regulating system comprising a three-phase AC generator having armature windings and a field winding, a three-phase fullwave rectifier for rectifying the three-phase output of said generator and for charging a battery, a transistor switching circuit connected to said field winding for switching the current therethrough and thereby controlling the output of said generator, said transistor switching circuit having a positive feedback circuit means for causing a substantial degree of switching hysteresis theRein, and a two phase rectifier for rectifying only two phases of said generator output and for energizing said switching circuit such that there are periodic off-times of switching circuit energization to minimize undue voltage deviation that might otherwise result from the switching hysteresis.
Claim 3
Dependent Claim
36 words
A system as in claim 1 further comprising a resistor means connected between an AC terminal of said two-phase rectifier and a terminal of said battery for supplying an initial excitation current to said field winding.
Claim 4
Dependent Claim
93 words
A system as in claim 1 wherein said transistor switching circuit comprises: a first transistor which is actuated by comparison between the battery voltage and a reference voltage, and a Darlington-connected transistor circuit which is actuated by said first transistor but in an opposite sense thereto, and wherein said field winding of said generator is connected in series with an emitter-collector output of said Darlington-connected transistor circuit and, said positive feedback circuit means is connected between a base electrode of said first transistor and a collector output electrode of said Darlington-connected transistor circuit.
Claim 5
Dependent Claim
127 words
An improved battery voltage regulating system for regulating the output of a battery charging dynamo means by switching field winding dynamo current with a transistor switching circuit wherein undesirable high-frequency switching often caused by dynamo commutation noise is avoided without resulting in undue deviation of the regulated battery voltage, said improvement comprising: positive feedback means associated with said transistor switching circuit for producing a substantial degree of positive feedback and hence switching hysteresis such that said switching circuit is no longer sensitive to said commutation noise, and periodic energization means associated with said transistor switching circuit for periodically providing an off-time during which the switching point of said circuit is altered to eliminate undue battery voltage deviations that might otherwise by caused by said substantial switching hysteresis.
Claim 6
Dependent Claim
127 words
An improved battery voltage regulating system for regulating the output of a battery charging dynamo means by switching field winding dynamo current with a transistor switching circuit wherein undesirable high-frequency switching often caused by dynamo commutation noise is avoided without resulting in undue deviation of the regulated battery voltage, said improvement comprising: positive feedback means associated with said transistor switching circuit for producing a substantial degree of positive feedback and hence switching hysteresis such that said switching circuit is no longer sensitive to said commutation noise, and periodic energization means associated with said transistor switching circuit for periodically providing an off-time during which the switching point of said circuit is altered to eliminate undue battery voltage deviations that might otherwise by caused by said substantial switching hysteresis.
Claim 7
Dependent Claim
31 words
An improvement as in claim 4 wherein said feedback means comprises an impedance means connected between an input and an output of said transistor switching circuit to produce positive feedback therebetween.
Claim 8
Dependent Claim
29 words
An improvement as in claim 4 wherein said periodic energization means comprises a two-phase rectifier connected to said dynamo means for rectifying only two phases of electrical output therefrom.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |