US3668418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for controlled charging of stand-by storage batteries that supply a load on failure of power supply to the load from power mains
Assignee: SAFT Societe des Accumulateurs Fixes et de Traction SA
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Filing: 1969-12-22
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Granted: 1972-06-06
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Expires: 1989-12-22
Abstract
Abstract A system for controlled charging of a stand-by storage battery that supplies a load in the event of failure of a.c. power supply mains including high and low rate charging means energized by power from the mains to supply charging current to the stand-by battery selectively at high or low rates. This system includes a memory storage cell or device of low capacity relative to the stand-by battery which is connected to be charged in response to flow of discharge current from the stand-by battery only during stand-by operation of said stand-by battery while power supply from the mains is interrupted. The extent of charge thus received by the memory storage cell is proportional to the current actually discharged by the stand-by battery only while and if it is operative and discharging into the load during mains power failure. Upon restoration of power in the mains, the proportionately charged memory storage cell is caused to discharge automatically at a constant rate until exhausted and the discharge current of the memory cell is used to control circuit means to effect automatically high-rate charging of the stand-by battery from the mains until substantial exhaustion of the proportionate charge of the memory storage cell occurs, whereupon low rate charging of the stand-by battery from the mains commences automatically.
Inventors
- 👤 Pierre Godard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:51
CPC Classifications
H; H02; H02J; H02J9/00; H02J7/00; H02J7/90; H02J7/94; Y; Y02; Y02B; Y02B70/00; Y02B70/30; Y04; Y04S; Y04S20/00; Y04S20/20
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
266 words
That improvement in load supplying systems wherein a load is alternatively supplied either by power mains or by a stand-by storage battery upon occurrence of power failure at the mains comprising a storage battery recharging system for charging the battery selectively at high and low charge rates, a memory storage cell of low capacity relative to the stand-by storage battery, means for charging the memory storage cell to an exTent directly proportional to the total amount of current discharged by the stand-by storage battery while the latter is supplying current into the load during power failure at the mains, said means comprising a shunt circuit including a shunt resistor through which a portion of the total current discharged into the load by the stand-by battery at all times passes during discharge of the stand-by battery to provide a potential across said resistor directly proportional to the total current passing through said resistor, means for stabilizing and amplifying said potential and applying it to said memory cell to thereby charge said memory cell proportionately to the total current discharged by the stand-by storage battery, and means responsive to discharge of the proportionately charged memory cell on restoration of power supply at the mains to institute and maintain high rate charging of the stand-by storage battery from said mains for a period of time that is a function of the total proportionate charge received by the memory cell from the total quantity of current actually discharged by the stand-by battery into the load and means for thereafter establishing low rate charging of said stand-by battery from the mains.
Claim 2
Dependent Claim
266 words
That improvement in load supplying systems wherein a load is alternatively supplied either by power mains or by a stand-by storage battery upon occurrence of power failure at the mains comprising a storage battery recharging system for charging the battery selectively at high and low charge rates, a memory storage cell of low capacity relative to the stand-by storage battery, means for charging the memory storage cell to an exTent directly proportional to the total amount of current discharged by the stand-by storage battery while the latter is supplying current into the load during power failure at the mains, said means comprising a shunt circuit including a shunt resistor through which a portion of the total current discharged into the load by the stand-by battery at all times passes during discharge of the stand-by battery to provide a potential across said resistor directly proportional to the total current passing through said resistor, means for stabilizing and amplifying said potential and applying it to said memory cell to thereby charge said memory cell proportionately to the total current discharged by the stand-by storage battery, and means responsive to discharge of the proportionately charged memory cell on restoration of power supply at the mains to institute and maintain high rate charging of the stand-by storage battery from said mains for a period of time that is a function of the total proportionate charge received by the memory cell from the total quantity of current actually discharged by the stand-by battery into the load and means for thereafter establishing low rate charging of said stand-by battery from the mains.
Claim 3
Dependent Claim
48 words
That improvement in load supplying systems according to claim 1 including a stabilized voltage source energized by said storage battery to supply a polarizing control current to said amplifying means that provides for charging of said memory storage cell when failure of power supply at the mains occurs.
Claim 4
Dependent Claim
60 words
That improvement in load supplying systems according to claim 1 including monitoring means controlled by discharge of said memory storage cell and sensing means responsive to restoration of power supply in the power mains after failure monitored by said monitoring means to effect charging of the storage battery at high rate upon such restoration of power supply in the mains.
Claim 5
Dependent Claim
80 words
That improvement in load supplying systems according to claim 1 wherein said stabilizing and amplifying means comprises a first symmetrical transistorized differential amplifier provided with automatic compensation for temperature variations and transistorized conversion means for the amplified voltage also provided with compensation for temperature variations, and a stabilized voltage source energized by said storage battery to supply a polarizing control current for said voltage amplifying means, said stabilized voltage source comprising Zener diodes connected to terminals of said storage battery.
Claim 6
Dependent Claim
45 words
That improvement in load supplying systems according to claim 3 wherein said sensing means comprises a relay responsive to presence of power supply in the power mains and said monitoring means comprises a second relay responsive to presence of discharge from said memory storage cell.
Claim 7
Dependent Claim
67 words
That improvement in load supplying systems according to claim 2 including a circuit means supplied by a second stabilized voltage source supplied by the power mains to prevent charging of said memory storage cell while power supply exists in the mains, and also including a centralizing system authorizing fast rate charging of the storage battery from the mains whenever discharge of the memory storage cell is effected.
Claim 8
Dependent Claim
25 words
That improvement in load supplying systems according to claim 6 including means to effect discharge of the memory storage cell at a substantially constant value.
Claim 9
Dependent Claim
145 words
That improvement in load supplying systems according to claim 1 wherein said stabilizing and amplifying means comprises a high-gain integrated amplifier circuit whose input terminals are connected to receive a fraction of the voltage across the shunt, resistor means to reinject into said circuit a voltage drop proportional to said current charging the memory storage cell to fix the gain of said amplifier circuit and to eliminate effect of temperature variations, transistorized conversion means for the amplified voltage of said voltage amplifier means comprising two Zener diodes connected to the storage battEry and a transistor polarizable by said two Zener diodes, and circuit means to prevent charging of the memory storage cell while power is supplied by the mains, said last named circuit means comprising other Zener diodes connected to be supplied by the power mains and a transistor polarizable by said other Zener diodes.
Claim 10
Dependent Claim
50 words
That improvement in load supplying systems according to claim 8 including also a centralizing system comprising a relay controlling transistor and a relay connected thereto, said last named transistor being rendered conductive by simultaneous presence of power in the mains and of a discharge current from the memory storage cell.
Claim 11
Dependent Claim
65 words
That improvement in load supplying systems according to claim 7 wherein said means to effect discharge of the memory storage cell at substantially constant value comprises a discharge circuit including a transistor and a resistor connected for passage through it of discharge current from the memory storage cell, said last-named transistor having an emitter which is polarizable by the discharge current passing through the resistor.
Claim 12
Dependent Claim
57 words
That improvement in load supplying systems according to claim 1 wherein said storage battery recharging system for charging selectively at high and low charge rates includes means for effecting charging at the selected rates at respective different constant voltages, and temperature sensitive means for controlling the time of high rate charging of the storage battery as necessary.
Claim 13
Dependent Claim
221 words
That improvement in load supplying systems wherein the load is alternatively supplied by power mains and by a stand-by storage battery upon occurrence of failure at the power mains comprising a storage battery recharging system including means to charge the battery selectively at fast high rate and means to charge the battery at slow low rate from the power mains, means to control automatically the fast high rate charging time, said last-named means comprising a memory storage cell connected to be charged by the storage battery only while the latter is discharging into the load on occurrence of power failure and proportionately to the total amount of electricity actually discharged by the storage battery into the load, and circuit means for delivering discharge current from the proportionately charged memory storage cell to activate the high rate charging means of the storage battery upon restoration of power supply in the mains, an additional low capacity storage cell connected to be maintained in charged condition by power from the power mains and connected to the high rate charging means to activate the latter upon discharge of such low capacity storage cell and serve as an additional control for establishing fast high rate charging of the storage battery, and manual control means connected for effecting such discharge of said additional low capacity storage cell.
Claim 14
Dependent Claim
221 words
That improvement in load supplying systems wherein the load is alternatively supplied by power mains and by a stand-by storage battery upon occurrence of failure at the power mains comprising a storage battery recharging system including means to charge the battery selectively at fast high rate and means to charge the battery at slow low rate from the power mains, means to control automatically the fast high rate charging time, said last-named means comprising a memory storage cell connected to be charged by the storage battery only while the latter is discharging into the load on occurrence of power failure and proportionately to the total amount of electricity actually discharged by the storage battery into the load, and circuit means for delivering discharge current from the proportionately charged memory storage cell to activate the high rate charging means of the storage battery upon restoration of power supply in the mains, an additional low capacity storage cell connected to be maintained in charged condition by power from the power mains and connected to the high rate charging means to activate the latter upon discharge of such low capacity storage cell and serve as an additional control for establishing fast high rate charging of the storage battery, and manual control means connected for effecting such discharge of said additional low capacity storage cell.
Claim 15
Dependent Claim
47 words
That improvement in load supplying system according to claim 1 wherein said means for charging the memory storage cell comprise transistors and wherein said means responsive to discharge of current of the charged memory storage cell on restoration of power supply at the mains also includes transistors.
Claim 16
Dependent Claim
18 words
That improvement in load supplying systems according to claim 13 include temperature compensation means for all said transistors.
Claim 17
Dependent Claim
187 words
That improvement in load supplying systems wherein the load alternatively is supplied by power from power mains, and by a stand-by storage battery upon failure of power supply from the mains comprising a storage battery recharging system for charging the battery from the mains selectively at a high and low charge rates and comprising a memory storage cell of low capacity relative to that of the storage battery, circuit means including transistors connected for effecting charging of the memory storage cell by discharge current from the storage battery and proportionately to the total amount of current discharged therefrom while the latter is supplying the load on failure of power from the mAins, circuit means including transistors connected between the memory storage cell and said battery recharging system to permit discharge current flow from the proportionately charged memory storage cell on restoration of power supply in the mains to activate said storage battery charging system to high charge rate until discharge current flow from said proportionately charged memory storage cell substantially ceases, and means to thereafter re-establish low charging rate of the storage battery from said recharging system.
Claim 18
Dependent Claim
187 words
That improvement in load supplying systems wherein the load alternatively is supplied by power from power mains, and by a stand-by storage battery upon failure of power supply from the mains comprising a storage battery recharging system for charging the battery from the mains selectively at a high and low charge rates and comprising a memory storage cell of low capacity relative to that of the storage battery, circuit means including transistors connected for effecting charging of the memory storage cell by discharge current from the storage battery and proportionately to the total amount of current discharged therefrom while the latter is supplying the load on failure of power from the mAins, circuit means including transistors connected between the memory storage cell and said battery recharging system to permit discharge current flow from the proportionately charged memory storage cell on restoration of power supply in the mains to activate said storage battery charging system to high charge rate until discharge current flow from said proportionately charged memory storage cell substantially ceases, and means to thereafter re-establish low charging rate of the storage battery from said recharging system.
Claim 19
Dependent Claim
32 words
That improvement in load supplying systems according to claim 15 including relay means to cut off supply of the load by the storage battery while power is being supplied by the mains.
Claim 20
Dependent Claim
53 words
That improvement in load supplying systems according to claim 15 including also circuit means comprising transistors and a relay connected to the battery recharging system to discontinue automatically its charging at high rate and effect restoration of charging at low rate at substantial cessation of discharge current flow from said memory storage cell.
Claim 21
Dependent Claim
59 words
That improvement in load supplying systems according to claim 15 including means responsive to storage battery temperature and switching means operated thereby to change said battery recharging system from high rate to low rate charging irrespective of the charge condition of said memory storage cell when the storage battery temperature exceeds a determined value during high rate charging thereof.
Claim 22
Dependent Claim
172 words
That improvement in load supplying systems wherein a load is alternatively supplied either by power mains or a stand-by storage battery upon occurrence of power failure at the mains, comprising a storage battery recharging system for charging the battery selectively at high and low charging rates, a memory storage device of low capacity relative to the stand-by storage battery, means for charging said memory storage device to an extent directly proportionate to the total amount of current discharged by the stand-by battery while the latter is supplying current into the load during power failure, and automatic means responsive to operation of the proportionately charged memory storage device effective on restoration of power supply at the mains automatically to initiate and maintain high rate charging of the stand-by battery from said mains for a period of time that is a function of the total charge received by the memory storage device during actual discharge of the stand-by battery, and means for thereafter establishing low rate charging of said stand-by battery from the mains.
Claim 23
Dependent Claim
172 words
That improvement in load supplying systems wherein a load is alternatively supplied either by power mains or a stand-by storage battery upon occurrence of power failure at the mains, comprising a storage battery recharging system for charging the battery selectively at high and low charging rates, a memory storage device of low capacity relative to the stand-by storage battery, means for charging said memory storage device to an extent directly proportionate to the total amount of current discharged by the stand-by battery while the latter is supplying current into the load during power failure, and automatic means responsive to operation of the proportionately charged memory storage device effective on restoration of power supply at the mains automatically to initiate and maintain high rate charging of the stand-by battery from said mains for a period of time that is a function of the total charge received by the memory storage device during actual discharge of the stand-by battery, and means for thereafter establishing low rate charging of said stand-by battery from the mains.
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) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |