US3663943A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic voltage regulating system for a dc load
Assignee: Fuji Electric Co Ltd
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Filing: 1970-09-15
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Granted: 1972-05-16
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Expires: 1990-09-15
Abstract
Abstract For automatic voltage regulation for a DC load, fed from an AC source via a three-terminal thyristor or a silicon-controlled rectifier, a constant-voltage element is connected in parallel to the AC source via a nonvariable resistance, and a capacitor is provided which is charged, via a variable resistance, with a voltage corresponding to a difference between the constant voltage of the aforesaid constant-voltage element and the voltage of the DC load, the voltage of said capacitor being impressed to the control terminals of the three-terminal thyristor, i.e., the gate and cathode terminals of the silicon-controlled rectifier, via a threshold-value element (e.g., a Shockley diode) that becomes conductive when the voltage of the capacitor reaches a predetermined threshold value.
Inventors
- 👤 Tositaka Nakajima
- 👤 Tomoyuki Okubo
- 👤 Manabu Kobayashi
- 👤 Kimio Yoshioka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:49
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/02; H02M7/04; H02M7/12; H02M7/145; H02M7/155; H02M7/1555
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
218 words
An automatic voltage regulating apparatus adapted to feed a DC load from an arc power source, which comprises a first series circuit composed of a nonvariable resistor and a first constant voltage element, said series circuit being connected in parallel to said AC source; a control rectifier having first and second main electrodes and a gate electrode, said first main electrode being connected to one terminal of said AC source; circuit means for connecting said second main electrode with one terminal of said DC load; a second series circuit composed of a variable resistor and a capacitor, said second series circuit being connected in parallel between both main electrodes of said control rectifier through said nonvariable resistor; a third series circuit composed of two resistors and a second constant voltage element, said series circuit being connected in parallel between both main electrodes of said control rectifier; a potential divider for taking out a partial voltage which is in proportion to sum of the terminal voltage of one of said two resistors and terminal voltage of said second constant voltage element; and a switching element capable of being controlled, said element being adapted to apply the terminal voltage of said capacitor to the gate electrode of said control rectifier upon increase of said terminal voltage above said partial voltage.
Claim 2
Dependent Claim
218 words
An automatic voltage regulating apparatus adapted to feed a DC load from an arc power source, which comprises a first series circuit composed of a nonvariable resistor and a first constant voltage element, said series circuit being connected in parallel to said AC source; a control rectifier having first and second main electrodes and a gate electrode, said first main electrode being connected to one terminal of said AC source; circuit means for connecting said second main electrode with one terminal of said DC load; a second series circuit composed of a variable resistor and a capacitor, said second series circuit being connected in parallel between both main electrodes of said control rectifier through said nonvariable resistor; a third series circuit composed of two resistors and a second constant voltage element, said series circuit being connected in parallel between both main electrodes of said control rectifier; a potential divider for taking out a partial voltage which is in proportion to sum of the terminal voltage of one of said two resistors and terminal voltage of said second constant voltage element; and a switching element capable of being controlled, said element being adapted to apply the terminal voltage of said capacitor to the gate electrode of said control rectifier upon increase of said terminal voltage above said partial voltage.
Claim 3
Dependent Claim
270 words
An automatic voltage regulating apparatus adapted to feed a DC load from an AC source; which comprises a first series circuit composed of a nonvariable resistor and a first constant voltage element, said series circuit being connected in parallel to said AC power source; a control rectifier having first and second main electrodes and a gate electrode said first main electrode being connected to one terminal of said AC source; a resistor connected between said second main electrode and one terminal of said DC load and adapted to take out a voltage being in proportion to load current of said DC load; circuit means for connecting another terminal of said AC power source and another terminal of said DC load; a second series circuit composed of a variable resistor and a capacitor, said series circuit being connected in parallel between both main electrodes of said control rectifier through said nonvariable resistor; a third series circuit composed of the other two resistors and a second constant voltage element, said third seris circuit being connected between said first main electrode and one terminal of said DC load; a potential divider for taking out a partial voltage being in proportion to a voltage obtained by subtracting the terminal voltage of one of said other two resistors from the sum of terminal voltage of said second constant voltage element and terminal voltage of said one resistor; and a switchinG element capable of being controlled, said element being adapted to apply the terminal voltage of said capacitor to said gate electrode of said control rectifier upon increase of said terminal voltage above said partial voltage.
Claim 4
Dependent Claim
270 words
An automatic voltage regulating apparatus adapted to feed a DC load from an AC source; which comprises a first series circuit composed of a nonvariable resistor and a first constant voltage element, said series circuit being connected in parallel to said AC power source; a control rectifier having first and second main electrodes and a gate electrode said first main electrode being connected to one terminal of said AC source; a resistor connected between said second main electrode and one terminal of said DC load and adapted to take out a voltage being in proportion to load current of said DC load; circuit means for connecting another terminal of said AC power source and another terminal of said DC load; a second series circuit composed of a variable resistor and a capacitor, said series circuit being connected in parallel between both main electrodes of said control rectifier through said nonvariable resistor; a third series circuit composed of the other two resistors and a second constant voltage element, said third seris circuit being connected between said first main electrode and one terminal of said DC load; a potential divider for taking out a partial voltage being in proportion to a voltage obtained by subtracting the terminal voltage of one of said other two resistors from the sum of terminal voltage of said second constant voltage element and terminal voltage of said one resistor; and a switchinG element capable of being controlled, said element being adapted to apply the terminal voltage of said capacitor to said gate electrode of said control rectifier upon increase of said terminal voltage above said partial voltage.
Claim 5
Dependent Claim
197 words
An automatic voltage regulating system adapted to feed a DC load from an AC source, which comprises; a first series circuit composed of a non-variable resistor and a constant voltage element which are connected in parallel to said AC source, said constant voltage element being composed of two partial constant voltage elements; a control rectifier having first and second main electrodes and a gate electrode, said first main electrode being connected to one terminal of said AC source; circuit means for connecting said second main electrode with one terminal of said DC load; another circuit means for connecting the other terminal of said AC source with the other terminal of said DC load; a second series circuit composed of a variable resistor and a first capacitor, said second series circuit being connected in parallel between said main electrodes of said control rectifier through said non-variable resistor; a threshold element adapted to apply the voltage of said capacitor to the gate electrode of said control rectifier upon reaching of said voltage to a predetermined value; and a diode connected between a common connection point of said partial constant voltage elements and said one terminal of said DC load.
Claim 6
Dependent Claim
197 words
An automatic voltage regulating system adapted to feed a DC load from an AC source, which comprises; a first series circuit composed of a non-variable resistor and a constant voltage element which are connected in parallel to said AC source, said constant voltage element being composed of two partial constant voltage elements; a control rectifier having first and second main electrodes and a gate electrode, said first main electrode being connected to one terminal of said AC source; circuit means for connecting said second main electrode with one terminal of said DC load; another circuit means for connecting the other terminal of said AC source with the other terminal of said DC load; a second series circuit composed of a variable resistor and a first capacitor, said second series circuit being connected in parallel between said main electrodes of said control rectifier through said non-variable resistor; a threshold element adapted to apply the voltage of said capacitor to the gate electrode of said control rectifier upon reaching of said voltage to a predetermined value; and a diode connected between a common connection point of said partial constant voltage elements and said one terminal of said DC load.
Claim 7
Dependent Claim
234 words
An automatic voltage regulating system adapted to feed a DC load from an AC source, which comprises; a first series circuit composed of a non-variable resistor and a constant voltage element which are connected in parallel to said AC source; a control rectifier having first and second main electrodes and a gate electrode, said first main electrode being connected to one terminal of said AC source; circuit means for connecting said second main electrode with one terminal of said DC load; another circuit means for connecting the other terminal of said AC source with the other terminal of said DC load; a second series circuit composed of a variable resistor and a first capacitor, said second series circuit being connected in parallel between said main electrodes of said control rectifier through said non-variable resistor; a threshold element adapted to apply the voltage of said capacitor to the gate electrode of said control rectifier upon reaching of said voltage to a predetermined value; a third series circuit composed of a diode and a second capacitor, said third series circuit being connected in parallel to said second series circuit; a resistor connected in parallel to said second capacitor; and a fourth series circuit which is composed of another resistor and diode, said fourth series circuit being connected between a common connection point of the diode and said second capacitor and one terminal of the AC source.
Claim 8
Dependent Claim
234 words
An automatic voltage regulating system adapted to feed a DC load from an AC source, which comprises; a first series circuit composed of a non-variable resistor and a constant voltage element which are connected in parallel to said AC source; a control rectifier having first and second main electrodes and a gate electrode, said first main electrode being connected to one terminal of said AC source; circuit means for connecting said second main electrode with one terminal of said DC load; another circuit means for connecting the other terminal of said AC source with the other terminal of said DC load; a second series circuit composed of a variable resistor and a first capacitor, said second series circuit being connected in parallel between said main electrodes of said control rectifier through said non-variable resistor; a threshold element adapted to apply the voltage of said capacitor to the gate electrode of said control rectifier upon reaching of said voltage to a predetermined value; a third series circuit composed of a diode and a second capacitor, said third series circuit being connected in parallel to said second series circuit; a resistor connected in parallel to said second capacitor; and a fourth series circuit which is composed of another resistor and diode, said fourth series circuit being connected between a common connection point of the diode and said second capacitor and one terminal of the AC source.
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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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |