Patent US3737760A successfully refreshed from Google Patents.
US3737760A
Expired / Lapsed
US
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Voltage control apparatus for an alternating current generator
Assignee: Hitachi Ltd
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Filing: 1971-10-12
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Granted: 1973-06-05
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Expires: 1991-10-12
Abstract
Abstract A voltage control apparatus for an alternating current generator comprising an alternating current generator which is selfexcited, an electric motor for driving the generator, a control rectifier arrangement for exciting the field winding of the generator by rectifying the output voltage of the generator, a phase shifter for controlling the control rectifier, a saturable reactor excited by the output of the generator, a rectifier for rectifying the current flowing through the reactor to supply a control input for the phase shifter, and a resistor connected across the alternating current terminals of the rectifier to bypass the current of the reactor.
Inventors
- 👤 H Kiwaki
- 👤 H Sato
- 👤 T Kuwabara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:45
CPC Classifications
H; H02; H02P; H02P9/00; H02P9/44; H02P9/14; H02P9/34
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
130 words
A voltage control apparatus for an alternating current generator having a field winding comprising a motor in driving connection with said generator, voltage control rectifier means for exciting the field winding of said generator with the rectified output voltage of said generator, phase shifter means for controlling said control rectifier means in response to an applied control signal, a saturable reactor excited by the output of said generator, a rectifier connected in series with said reactor across the output of said generator and to said phase shifter means for rectifying the current flowing through said reactor and supplying the rectified current as said control signal to said phase shifter means, and bypassing means connected to the alternating current side of said rectifier to partially bypass the current of said reactor.
Claim 2
Dependent Claim
130 words
A voltage control apparatus for an alternating current generator having a field winding comprising a motor in driving connection with said generator, voltage control rectifier means for exciting the field winding of said generator with the rectified output voltage of said generator, phase shifter means for controlling said control rectifier means in response to an applied control signal, a saturable reactor excited by the output of said generator, a rectifier connected in series with said reactor across the output of said generator and to said phase shifter means for rectifying the current flowing through said reactor and supplying the rectified current as said control signal to said phase shifter means, and bypassing means connected to the alternating current side of said rectifier to partially bypass the current of said reactor.
Claim 3
Dependent Claim
48 words
A voltage control apparatus according to claim 1 wherein said reactor has an auxiliary winding and a main winding, and means for selectively connecting portions of said auxiliary winding in series with said main winding so as to change the number of turns and polarity of said reactor.
Claim 4
Dependent Claim
46 words
A voltage control apparatus according to claim 1 further comprising a transformer having a primary winding connected across the output of said generator and a secondary winding connected to said reactor for matching the output voltage of said generator with the voltage for exciting said reactor.
Claim 5
Dependent Claim
47 words
A voltage control apparatus according to claim 3 wherein said transformer has an auxiliary winding and a main winding on the secondary side, and means for selectively connecting portions of said auxiliary winding in series with said main winding so as to change the number of turns.
Claim 6
Dependent Claim
24 words
A voltage control apparatus according to claim 1 further comprising a limiter connected to said reactor for limiting the output current of said reactor.
Claim 7
Dependent Claim
25 words
A voltage control apparatus according to claim 5 wherein said limiter is a zener diode provided across a direct current output side of said rectifier.
Claim 8
Dependent Claim
26 words
A voltage control apparatus according to claim 5 wherein said limiter is an additional saturable reactor provided across an alternating current input side of said rectifier.
Claim 9
Dependent Claim
133 words
A voltage control apparatus for a self-excited alternating current generator having a voltage control rectifier arrangement connecting the output of the generator to its field winding, comprising phase shifter means for controlling said control rectifier arrangement in response to an applied control signal to vary the phase angle of conduction thereof, control means for generating said control voltage including a saturable reactor excited by the output of said generator and rectifier means connected in series with said reactor across the output of said generator and to said phase shifter means for rectifying the current flowing through said reactor and supplying the rectified current as said control signal to said phase shifter means, and bypassing means connected across the alternating current side of said rectifier means for partially bypassing the current of said reactor.
Claim 10
Dependent Claim
133 words
A voltage control apparatus for a self-excited alternating current generator having a voltage control rectifier arrangement connecting the output of the generator to its field winding, comprising phase shifter means for controlling said control rectifier arrangement in response to an applied control signal to vary the phase angle of conduction thereof, control means for generating said control voltage including a saturable reactor excited by the output of said generator and rectifier means connected in series with said reactor across the output of said generator and to said phase shifter means for rectifying the current flowing through said reactor and supplying the rectified current as said control signal to said phase shifter means, and bypassing means connected across the alternating current side of said rectifier means for partially bypassing the current of said reactor.
Claim 11
Dependent Claim
36 words
A voltage control apparatus according to claim 8 wherein said rectifier means is formed by a four diode rectifier bridge and said bypassing means is formed by a resistor connected across the input of said bridge.
Claim 12
Dependent Claim
35 words
A voltage control apparatus according to claim 9 wherein said resistor has a value to provide a voltage drop smaller than the voltage drop of the pair of diodes forming the input of said bridge.
Claim 13
Dependent Claim
20 words
A voltage control apparatus according to claim 9 wherein an additional saturable reactor is connected in parallel with said resistor.
Claim 14
Dependent Claim
34 words
A voltage control apparatus according to claim 9 further comprising a transformer connected between said generator and said reactor for matching the output voltage of said generator with the voltage for exciting said reactor.
Claim 15
Dependent Claim
24 words
A voltage control apparatus according to claim 12 further comprising a limiter connected to said reactor for limiting the output current of said reactor.
Claim 16
Dependent Claim
25 words
A voltage control apparatus according to claim 13 wherein said limiter is a zener diode provided across a direct current output side of said rectifier.
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) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |