Patent US3571691A successfully refreshed from Google Patents.
US3571691A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regulated dc power supply
Assignee: Hitachi Ltd
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Filing: 1968-10-01
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Granted: 1971-03-23
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Expires: 1988-10-01
Abstract
Abstract A regulated DC power supply consisting of a voltage regulating circuit which supplies the load with a current just to compensate the variation in the load current and another circuit connected in parallel to said voltage regulating circuit which supplies the remaining and constant portion of the load current, thereby making it possible to reduce the necessary current bearing capacity of the regulating components.
Inventors
- 👤 Koji Iwata
- 👤 Kenjiro Yokoyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:53
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/46; G05F1/62; G05F1/12; G05F1/14; G05F1/16; G05F1/20
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
175 words
A regulated DC power supply for supplying a load with DC power, including a voltage regulating circuit having an input and an output which comprises: means for rectifying an AC input voltage supplied to said input; variable impedance means for receiving said rectified AC input voltage and for producing a current, the magnitude of which is controlled by the variation of said variable impedance means, said current being supplied to said output; means for controlling the variation of said variable impedance means in response to the difference between the voltage at said output and a reference voltage; means for controlling the magnitude of said AC input voltage including a phase-controlled rectifier which is phase controlled in response to the difference between the current produced by said variable impedance means and a reference current, to thereby supply said load with a controlled current, a portion of which is supplied by said phase-controlled rectifier; and a fixed impedance element connected between said phasecontrolled rectifier and said output through which said portion of said controlled current is supplied.
Claim 2
Dependent Claim
175 words
A regulated DC power supply for supplying a load with DC power, including a voltage regulating circuit having an input and an output which comprises: means for rectifying an AC input voltage supplied to said input; variable impedance means for receiving said rectified AC input voltage and for producing a current, the magnitude of which is controlled by the variation of said variable impedance means, said current being supplied to said output; means for controlling the variation of said variable impedance means in response to the difference between the voltage at said output and a reference voltage; means for controlling the magnitude of said AC input voltage including a phase-controlled rectifier which is phase controlled in response to the difference between the current produced by said variable impedance means and a reference current, to thereby supply said load with a controlled current, a portion of which is supplied by said phase-controlled rectifier; and a fixed impedance element connected between said phasecontrolled rectifier and said output through which said portion of said controlled current is supplied.
Claim 3
Dependent Claim
148 words
A regulated DC power supply for supplying a load with DC power comprising: first and second circuits mutually connected in parallel between an AC power source and a load, wherein said first circuit comprises a means for rectifying the voltage produced by said AC power source; variable impedance means including at least one transistor circuit responsive to said rectified voltage for supplying a current to said load, the magnitude of which is varied according to the difference between the terminal voltage across the load and a reference voltage; and said second circuit comprising a phase-controlled rectifier receiving a voltage from said AC power source, responsive to the difference between the output of said variable impedance means and a reference current for controlling the magnitude of said AC voltage and for supplying said load with a controlled current in addition to the current supplied by said variable impedance means.
Claim 4
Dependent Claim
148 words
A regulated DC power supply for supplying a load with DC power comprising: first and second circuits mutually connected in parallel between an AC power source and a load, wherein said first circuit comprises a means for rectifying the voltage produced by said AC power source; variable impedance means including at least one transistor circuit responsive to said rectified voltage for supplying a current to said load, the magnitude of which is varied according to the difference between the terminal voltage across the load and a reference voltage; and said second circuit comprising a phase-controlled rectifier receiving a voltage from said AC power source, responsive to the difference between the output of said variable impedance means and a reference current for controlling the magnitude of said AC voltage and for supplying said load with a controlled current in addition to the current supplied by said variable impedance means.
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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) | 1974-03-22 | 1974-09-21 | 1975-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-22 | 1978-09-21 | 1979-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-22 | 1982-09-21 | 1983-03-23 | $7700.00 | Window Closed / Lapsed |