Patent US3707635A successfully refreshed from Google Patents.
US3707635A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant effective voltage power source circuit
Assignee: Denso Corp
•
Filing: 1970-11-03
•
Granted: 1972-12-26
•
Expires: 1990-11-03
Abstract
Abstract A constant effective voltage power source circuit utilizing the charging and discharging of a capacitor. It includes an output voltage detection circuit having non-linear elements such as a diode and a constant-voltage diode which impart a parabolic current-voltage characteristic to the power source circuit. The output voltage detection circuit functions to vary the charging current into the capacitor, which is repeatedly charged and discharged to provide an effective output voltage, in accordance with the source voltage detected by it to control the effective output voltage to a constant value.
Inventors
- 👤 Yoshichi Kawashima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:35
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/10; H02M3/145; H02M3/155; H02M3/156; H02M3/1563; G; G01; G01F; G01F23/00; G01F23/22; G01F23/24; G05; G05F; G05F1/00; G05F1/66
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
187 words
A circuit for supplying constant power to a load comprising: means for receiving an input voltage, electronic switch means connecting said receiving means to said load and having a conducting and non-conductive condition, a capacitor, non-linear resistive means connecting said capacitor to said load so that the rate of charging of said capacitor varies as a function of the voltage at said load, including a first resistor, a second resistive branch connected in parallel with said first resistor and comprising a serially connected second resistor and diode so that the effective resistance between said load and said capacitor is reduced at a predetermined load voltage which causes said diode to conduct through said second resistor, and electronic control means connected to said capacitor and to said switch means for causing said switch means to shift from a first to a second condition when the charge on said capacitor exceeds a predetermined value and thereafter to shift back to said first condition so that the power supplied to said load remains constant and foR causing said capacitor to discharge while said switch means is in said second condition.
Claim 2
Dependent Claim
187 words
A circuit for supplying constant power to a load comprising: means for receiving an input voltage, electronic switch means connecting said receiving means to said load and having a conducting and non-conductive condition, a capacitor, non-linear resistive means connecting said capacitor to said load so that the rate of charging of said capacitor varies as a function of the voltage at said load, including a first resistor, a second resistive branch connected in parallel with said first resistor and comprising a serially connected second resistor and diode so that the effective resistance between said load and said capacitor is reduced at a predetermined load voltage which causes said diode to conduct through said second resistor, and electronic control means connected to said capacitor and to said switch means for causing said switch means to shift from a first to a second condition when the charge on said capacitor exceeds a predetermined value and thereafter to shift back to said first condition so that the power supplied to said load remains constant and foR causing said capacitor to discharge while said switch means is in said second condition.
Claim 3
Dependent Claim
18 words
A circuit as in claim 1 wherein said electronic switch means includes a pair of Darlington connected transistors.
Claim 4
Dependent Claim
76 words
A circuit as in claim 1 wherein said non-linear resistive means further includes a third resistive branch connected in parallel with said first resistor comprising a plurality of diodes serially connected with said diode and a third resistor serially connected with said plurality of diodes and a fourth branch serially connected with said first resistor comprising a zener diode serially connected with said plurality of diodes and a fourth resistor serially connected with said zener diode.
Claim 5
Dependent Claim
199 words
A circuit for supplying constant power to a load comprising: means for receiving an input voltage, electronic switch means connecting said receiving means to said load and having a conducting and non-conductive condition, a capacitor, non-linear resistive means connecting said capacitor to said load so that the rate of charging of said capacitor varies as a function of the voltage at said load, and electronic control means connected to said capacitor and to said switch means for causing said switch means to shift from a first to a second condition when the charge on said capacitor exceeds a predetermined value and thereafter to shift back to said condition so that the power supplied to said load remains constant and for causing said capacitor to discharge while said switch means is in said second condition, including a Schmidt trigger circuit, a zener diode connecting said capacitor to said Schmidt trigger circuit for causing said Schmidt trigger to produce a pulse when the charge on said capacitor exceeds said predetermined value, and a pair of Darlington connected transistors for causing said electronic switch means to shift from said non-conductive to said conductive condition when said Schmidt trigger circuit produces said pulse.
Claim 6
Dependent Claim
199 words
A circuit for supplying constant power to a load comprising: means for receiving an input voltage, electronic switch means connecting said receiving means to said load and having a conducting and non-conductive condition, a capacitor, non-linear resistive means connecting said capacitor to said load so that the rate of charging of said capacitor varies as a function of the voltage at said load, and electronic control means connected to said capacitor and to said switch means for causing said switch means to shift from a first to a second condition when the charge on said capacitor exceeds a predetermined value and thereafter to shift back to said condition so that the power supplied to said load remains constant and for causing said capacitor to discharge while said switch means is in said second condition, including a Schmidt trigger circuit, a zener diode connecting said capacitor to said Schmidt trigger circuit for causing said Schmidt trigger to produce a pulse when the charge on said capacitor exceeds said predetermined value, and a pair of Darlington connected transistors for causing said electronic switch means to shift from said non-conductive to said conductive condition when said Schmidt trigger circuit produces said pulse.
Claim 7
Dependent Claim
165 words
A circuit for supplying constant power to a load comprising: a load including an oil gauge and resistive means serially connected with said gauge having a resistance which varies as a function of the quantity of oil in a can, means for receiving an input voltage, electronic switch means connecting said receiving means to said load and having a conductive and non-conductive condition, a capacitor, non-linear resistive means connecting said capacitor to said load so that the rate of charging of said capacitor varies as a function of the voltage at said load, and electronic control means connected to said capacitor and to said switch means for causing said switch means to shift from a first to a second condition when the charge on said capacitor exceeds a predetermined value and thereafter to shift back to said first condition so that the power supplied to said load remains constant and for causing said capacitor to discharge while said switch means is in said second condition.
Claim 8
Dependent Claim
165 words
A circuit for supplying constant power to a load comprising: a load including an oil gauge and resistive means serially connected with said gauge having a resistance which varies as a function of the quantity of oil in a can, means for receiving an input voltage, electronic switch means connecting said receiving means to said load and having a conductive and non-conductive condition, a capacitor, non-linear resistive means connecting said capacitor to said load so that the rate of charging of said capacitor varies as a function of the voltage at said load, and electronic control means connected to said capacitor and to said switch means for causing said switch means to shift from a first to a second condition when the charge on said capacitor exceeds a predetermined value and thereafter to shift back to said first condition so that the power supplied to said load remains constant and for causing said capacitor to discharge while said switch means is in said second condition.
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) | 1975-12-26 | 1976-06-26 | 1976-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-26 | 1980-06-26 | 1980-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-26 | 1984-06-26 | 1984-12-26 | $7700.00 | Window Closed / Lapsed |