EP0377671A1 - Chargeur de batterie a reaction thermique - Google Patents

Chargeur de batterie a reaction thermique

Info

Publication number
EP0377671A1
EP0377671A1 EP88909024A EP88909024A EP0377671A1 EP 0377671 A1 EP0377671 A1 EP 0377671A1 EP 88909024 A EP88909024 A EP 88909024A EP 88909024 A EP88909024 A EP 88909024A EP 0377671 A1 EP0377671 A1 EP 0377671A1
Authority
EP
European Patent Office
Prior art keywords
battery
charger
temperature
charging
responsive
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP88909024A
Other languages
German (de)
English (en)
Inventor
Pradeep M. Bhagwat
Daniel Steven Daniel
Samuel G. Woods
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Black and Decker Inc
Original Assignee
Black and Decker Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Black and Decker Inc filed Critical Black and Decker Inc
Publication of EP0377671A1 publication Critical patent/EP0377671A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
    • H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
    • H02J7/007194—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature of the battery

Definitions

  • This invention relates to a thermally responsive battery charger and particularly relates to a battery charger for thermally responding to the temperature of a battery to be charged prior to and during a charging operation to control the charging of the battery.
  • a thermostat is contained within a package along with the battery.
  • the thermostat is contained within a charger base adjacent the location of the battery being charged.
  • a battery which is contained in a package with the thermostat may be at or above the trip temperature prior to insertion into the battery charger. In this condition, the thermostat will be open and will not allow the fast-charge cycle to begin until the battery cools sufficiently. Obviously, this delays the charging time and necessitates continued attendance by the user until the battery has cooled sufficiently to permit the charging cycle to begin assuming that the user is aware that the battery is hot. If a heated battery is placed in a charger where the thermostat is contained within the charger base, the thermostat will require a finite period (perhaps one to two minutes) to respond to the heat of the battery before opening. During this finite period, a " charge indicator is providing indication to the user that the fast charge cycle has begun. Typically, the user proceeds with other tasks unaware that the charger will shut down within a minute or two when the thermostat opens in response to the hot battery. If the thermostat is a manual-reset type, the user will return to find a cooled but uncharged battery.
  • thermally-responsive battery charger which will automatically delay the initiation of a charging cycle if the battery is hot when inserted into the charger and will initiate the charging cycle when, the battery cools to an appropriate temperature. Further, there is a need for a battery charger which will prevent the charger from reinitiating the charging cycle after the fully charged battery has cooled.
  • a battery charger includes means for initially determining the temperature of a battery during a period prior to initiating the charging of the battery. In response to the temperature of the battery being at or below a charge-start temperature at least at the end of the period, means are provided for initiating the charging of the battery. When the battery reaches full charge, means are provided for terminating the charging operation.
  • a battery charger includes means responsive to the battery being fully charged for preventing the charger from operating in a charge mode even though the temperature of the battery may decrease eventually to or below the charge-start temperature.
  • a battery charger is operable from a primary or first power source and which includes means for developing a second power source internally of the charger in response to the connecting of the battery in the charger.
  • a battery charger includes means for precluding the initial supply of charging current to the battery when the voltage in the charging circuit exceeds a prescribed level to prevent the occurrence of potentially damaging high current spikes.
  • a battery charger includes means responsive to the battery heating to a charge-stop temperature indicative of a fully charged battery for terminating the charge of the battery and further includes means for compensating for any temperature level emanating from any environment other than from the battery from having an influence upon the operation of the means for terminating the charging operation in response to the temperature of the battery at full charge thereof.
  • FIG. 1 is a schematic of a thermally responsive battery charger in accordance" ⁇ ith certain, principles of the invention.
  • FIG. 2 is a schematic of the thermally responsive battery charger of FIG. 1 with facility for temperature compensation in accordance with certain principles of the invention.
  • one embodiment of the invention includes a battery charger 10 which has been designed to avoid the disadvantages noted above with respect to thermostat-controlled chargers while retaining the temperature-responsive aspect for charger control.
  • battery charger 10 is operated from a conventional 120 VAC, 60 Hz source 12.
  • the AC voltage of source 12 is rectified by a full wave rectifier 14, the output current of which is supplied selectively through a silicon-controlled rectifier (SCR) 16 to a battery 18 to be charged.
  • a low-impedance capacitor 20 is connected in series between source 12 and rectifier 14 and limits the charging current supplied to battery 18.
  • Capacitor 20 provides a capacitive impedance means which limits the level of charging current supplied to battery 18 to a constant predetermined level sufficient to effect a fast charge of the battery. As one example, if capacitor 20 is valued at 45 micro farads, and with 120 volts being applied by source 12, the constant current would be 1.7 amps. Other capacitance values could be selected for capacitor 20 to obtain different current levels without departing from the spirit and scope of the invention.
  • charger 10 In the following description of the operation of charger 10, two conditions will be considered. The operation of charger 10 will be described, first, with respect to the condition when battery 18 is cool (i.e. at or below 40°C) when inserted into the charger and, secondly, with respect to the condition when the battery is hot (i.e. above 40 ⁇ C) when inserted into the charger. Note that in the disclosed embodiment, batteries which are considered sufficiently cool to begin a battery charging operation are usually at or below 40 ⁇ C. Therefore, this temperature, 40°C, is referred to as the battery-cool temperature.
  • cooled battery 18 is inserted into charger 10 to complete a circuit which establishes a low D.C. voltage source Vcc at about fifteen volts.
  • Source Vcc is established by charging a capacitor 22.
  • a Zener diode 24. is connected across capacitor 22 and functions to maintain the charged level at approximately fifteen volts.
  • AC current from source 12 is supplied to capacitor 22, on alternate half cycles, through two diodes 26 and 28, respectively, and returns through ground, battery 18 and rectifier diodes 30 and 32, respectively.
  • AC source 12 is a first power source and is conne ⁇ table to charger 10 while low DC voltage source Vcc is a second power "source which is developed internally of the charger.
  • source Vcc is not developed until battery 18 has been connected in charger 10.
  • the components of charger 10 which require operational voltage from source Vcc will not function until battery 18 is connected to the charger.
  • source Vcc When source Vcc is established, the voltage is initially applied across an RC circuit which includes a resistor 38 and a capacitor 40. Also, the voltage of source Vcc is applied to pin 8 of a CMOS RC timer 42 to provide operating power to the timer.
  • Timer 42 is of the type commonly referred to in the industry as a "555" timer and functions as a first control circuit.
  • the output (pin 3) of timer 42 then goes high which is coupled through a resistor 44 to the base of a transistor 46. With the base high, current will flow into the base of transistor 46 which turns on and thereby connects ground to the gate of. SCR 16 whereby the SCR is disabled.
  • the trigger (pin 2) of timer 42 rises to a voltage level above two-thirds the Vcc level to condition the timer for subsequent switching of the output (pin 3) to a low level as described below.
  • transistor 46 is on and SCR 16 is not conducting. Since SCR 16 is not conducting, charging current is not being supplied to battery 18 during the initial operation of charger 10.
  • the output (pin 3) of timer 42 goes high as noted above, current is supplied through a resistor 49 to the base of a transistor 50 which is thereby turned on to couple ground to the reset input (pin 4) of another "555" CMOS RC timer 52 which functions as a second control circuit.
  • Thermistor 58 is a negative temperature coefficient (NTC) thermally-responsive device, whereby the resistance of the thermistor decreases with an increase in temperature and vice versa.
  • NTC negative temperature coefficient
  • a capacitor 62 is charging through a resistor 64 eventually to establish a threshold voltage at point 66.
  • the threshold voltage should be at least equal to two-thirds the value of the voltage of source Vcc.
  • the threshold voltage at point 66 is attained after the prescribed period of one minute.
  • the threshold voltage at point 66 is coupled to the threshold (pin 6)
  • diode 56 is now reverse biased and current no longer flows through resistor 54 and the diod .
  • charger 10 goes into a fast-charge mode. During this mode, current is flowing through resistor 60 and thermistor 58. Now that the reset (pin 4) of timer 52 is high, the voltage input at the trigger (pin 2) must drop below approximately one-third the value of source Vcc to cause the output (pin 3) to go high. When thermistor 58 is cool, the resistance of the thermistor is relatively high.
  • the voltage on the trigger (pin 2) of timer 52 is above one-third of the Vcc level, but below two-thirds of the Vcc level for all operating conditions, whereby the output (pin 3) of the timer remains low.
  • the output (pin 3) of timer 52 With the output (pin 3) of timer 52 low, current flows through a resistor 68 and an LED 70 to turn on the LED to indicate that charger 10 is in the fast-charge, mode.
  • the low output (pin 3) of timer 52 is coupled to the base of transistor 46 to sustain the non-conducting mode of the transistor.
  • the battery temperature increases, for example, to a level of 45°C which causes thermistor 58 also to heat up whereby the resistance of the- thermistor decreases.
  • the voltage across thermistor 58 drops below the one-third Vcc level and all conditions are satisfied whereby the output (pin 3) of timer 52 goes high and enters a charge-stopping mode. This high is coupled to the base of transistor 46 to turn on the transistor. With transistor 46 turned on, SCR 16 is disabled to terminate the fast- charge mode.
  • the battery temperature of 45"C represents a charge-stop temperature.
  • the threshold (pin 6) of timer 52 is connected to ground and, therefore, will never exceed a voltage value which is two-thirds Vcc.
  • a point 80 is very close to ground. This potential is coupled through resistors 44 and 49 to the base of transistor 50 whereby the transistor will not turn on when the output (pin 3) of timer 52 goes high.
  • the resistance of thermistor 58 increases to a level whereby the voltage applied to the trigger (pin 2) of timer 52 rises above one-third the Vcc level.
  • the reset (pin 4) of timer 52 remains high.
  • the output (pin 3) of timer 52 remains high to keep transistor 46 on and, thereby, SCR 16 non-conducting. This is so even though the voltage at the trigger (pin 2) of timer 52 has risen above one-third the Vcc level.
  • charger 10 is essentially locked into a no-charge or charge-stopping mode even though battery 18 cools to or below a temperature level (40 ° C) which otherwise would have permitted the charger to return to the fast-charge mode. Effectively then, charger 10 remembers that battery 18 has been charged previously and does not have to be recharged. The charge-stopping mode will be sustained until battery 18 is removed and another battery to be charged is connected in charger 10.
  • Trim resistors 54A, 54B, 60A and 60B are provided initially in charger 10 and are adjusted at the factory to compensate for a twenty-percent tolerance factor usually encountered with thermistors such as thermistor 58. In this manner, every charger 10 will be set to respond to the same cut-off temperature level of battery 18 in controlling operation of the charger.
  • a capacitor 78 is connected in parallel with thermistor 58 to insure that the voltage across the thermistor is stable and not affected by spurious noise signals.
  • a resistor 79 is connected in parallel with capacitor 20 to provide a discharge path for the energy stored in the capacitor when SCR 16 is turned off, when battery 18 is removed or when charger 10 is disconnected from AC source 12.
  • transistor 46 is controlled -through timer 42 to selectively fire SCR 16 at the start of a charge cycle.- Prior to the starting of the charge cycle, SCR 16 is not conducting and, consequently, there is no current flow through capacitor 20. Therefore, capacitor 20 is fully discharged. Under this condition, the voltage appearing across the anode and cathode of SCR 16 is equal at any instant to the output voltage of AC source 12 minus the voltage of battery 18 waiting to be charged. If SCR 16 is fired in response to the output of timer 42 going low as described above, the voltage suddenly shifts from the fired SCR to capacitor 20.
  • capacitor 20 is a relatively low-impedance device, and if the firing of SCR occurs, during a period when the alternating voltage of source 12 is high (i.e. well ahead of or well beyond the zero-crossover of the voltage waveform) , an extremely high spike of current will occur which could damage capacitor 20, the diodes of rectifier 14, SCR 16 and perhaps other elements of charger 10.
  • the base of transistor 46 is connected through a Zener diode 82 to the anode of SCR 16 to provide a means for permitting the SCR to fire initially in each charge cycle only when the anode-cathode voltage of the SCR is relatively low.
  • diode 82 and the base-emitter circuit of transistor 46 are monitoring the voltage appearing across SCR 16.
  • the high appearing at the anode of the SCR is coupled to the base of transistor 46 whereby the transistor is turned on. This grounds the gate of SCR 16 and thereby prevents the SCR from firing.
  • Zener diode 82 When the voltage across SCR 16 is below the breakdown voltage of Zener diode 82, transistor 46 is shut down and the gate of SCR 16 is high whereby the SCR fires.
  • the breakdown level of Zener diode 82 is set so that SCR 16. can fire at voltage levels slightly below and above the zero crossover of the voltage waveform of AC source 12. In this manner, a small window at a very low voltage level is provided for initial firing of SCR 16 and the SCR is precluded from firing at higher voltage levels of AC source 12. Therefore, if the output (pin 3) of timer 42 goes low to start the charge cycle at a time when the voltage level of AC source 12 is outside the window levels, Zener diode 82 will have already broken down and transistor 46 continues to conduct thereby preventing SCR 16 from firing.
  • Zener diode 82 Upon occurrence of the next window, Zener diode 82 is no longer conducting and the continued low output of timer 42 turns off transistor 46. At this time, SCR 16 fires in the safe voltage region of the window and the fast-charge cycle begins. Thus, a high current spike will not occur and the various components of charger 10 are thereby protected.
  • the voltage of capacitor 20 will be in sync with and will follow the voltage of A.C. source 12.
  • conditions could occur within charger 10 where the varying voltage of source 12 and the voltage of capacitor 20 would be cumulative and, therefore potentially harmful.
  • capacitor 20 will begin to discharge through bleeder resistor 79. If another battery 18 is inserted before capacitor 20 is fully discharged, A.C. source 12 and capacitor 20 may be out of sync whereby the voltages from the source and the capacitor could be cumulative
  • SCR 16 was permitted to fire during a period when the cumulative voltage was high, damage to components of charger 10 could occur.
  • Zener diode 82 SCR 16 is prevented from firing during periods of high cumulative voltage in the same manner described above with respect to the zero-crossover situation. This prevents any damage to components of charger 10.
  • a thermal fuse 84 is connected in the series path of the charging current and is physically located within charger 10 adjacent the location of battery 18. If the temperature of battery 18 exceeds a prescribed level (e.g., 80°C) which is indicative of serious overcharge, the temperature of the battery will cause thermal fuse 84 to open whereby charging current ceases to flow. In this manner, a catastrophic event of battery meltdown and possible user injury is avoided.
  • a prescribed level e.g. 80°C
  • thermistor 58 In the physical arrangement of charger 10, the components thereof, including thermistor 58, are located within a housing (not shown) . Even though thermistor 58 is located adjacent the location of battery 18 for the above-described purpose, the heat generated by the components within the environment of the housing, as well as the temperature of the environment outside of the housing, also has an effect on the thermistor.
  • Resistor 60 and any of the remaining trim resistors 60A and 60B are located in the current-feed path of thermistor 58 and represent a fixed resistance. As the temperature within the housing rises, and as the battery temperature rises, the combined effect of these dual temperature increases causes the resistance of thermistor 58 to decrease. Since the resistance of resistor 60 and any remaining trim resistors 60A and 60B is fixed, the voltage drop across the decreasing resistance of thermistor 58 will decrease more rapidly in response to the dual temperature increases than it would have decreased solely in response to the battery temperature. Thus, the thermistor voltage drop will fall to a level below the one-third Vcc level before battery 18 reaches full charge and the charging operation will be prematurely terminated.
  • FIG. 2 The preferred embodiment of the invention is illustrated in FIG. 2 wherein battery charger 10 has been modified to include a second NTC thermistor 90 in place of trim resistors 60A and 60B to compensate for the dual temperature effect.
  • Thermistor 90 is connected in parallel with resistor 60 and is located in the current-feed path of thermistor 58.
  • Thermistor 90 is located physically within the charger housing so as to be affected only by the heat within the environment of the housing and the environment outside of the housing and not by the heat from battery 18.
  • the dual temperature effect causes the resistance of thermistor 58 to decrease which would heretofore cause the voltage drop across the thermistor to also decrease accordingly 5 together with an increase in the voltage drop across resistor 60.
  • thermistor 90 now in parallel with resistor 60, and with the temperature within the charger housing increasing due to heat generated by the charger components and the temperature
  • the resistance of thermistor 90 also decreases to reduce the effective resistance of the parallel-connected resistor 60 and thermistor 90. This creates a condition where the resistances of both thermistors 58 and 90 are
  • thermistors changes at a slower rate than in the prior circuit which did not include thermistor 90. This allows the passage of additional time before the voltage drop across thermistor 58 falls below the one-third Vcc level necessary for terminating the
  • a positive temperature coefficient thermistor could be placed in the housing and connected in parallel with thermistor 58 to provide 0 a temperature compensating effect.
  • the resulting cool interior of the housing also could have an effect on the ability of thermistor 58 to 5 respond accurately to the temperature of battery 18.
  • the thermistor is also located within the housing of charger 10 wherein the cooling effect from the ambient temperature could slow the rate of decrease of thermistor resistance even though the temperature of the battery is increasing. In this instance, battery 18 will continue to charge beyond full-charge until sufficient heat has been generated by the battery to cause the voltage drop of thermistor 58 to fall below one-third Vcc to thereby terminate the charging cycle.
  • the inclusion of thermistor 90 in charger 10 also compensates for the cool temperature effect in a manner similar to that described above with respect to the high temperature effect.
  • thermistor 90 facilitates temperature compensation or charger 10 for temperatures above and below a desired ambient operating temperature both inside and outside the housing.
  • charger 10 provides a system for delaying the initiation of a fast-charge cycle to • provide sufficient time to electronically analyze the condition of battery 18. If battery 18 is cool, (i.e., at or below 40 ⁇ C) charger 10 will proceed through a fast- charge cycle and thermally respond to the attainment of.full charge of the battery and thereby stop the charging operation. If battery 18 is hot (i.e., above 40°C) when it is inserted into charger 10, the initial delay provides the charger with sufficient time to thermally respond to the hot battery and to delay further the initiation of the charge cycle until the battery has sufficiently cooled. When battery 18 heats again due to attaining full charge, charger 10 stops the charge cycle and will not permit the restarting of the charge cycle even though the battery may cool well below the trip temperature of 40°C.
  • charger 10 includes a unique low voltage supply Vcc which is not developed until battery 18 is connected in the charger. This keeps all low-voltage operable devices and components in the non-operating state until operation thereof is required. Also, charger 10 insures that a charging current switch, i.e. SCR 16, will only fire initially within a relatively small window at low level voltage portions of the AC input to avoid the occurrence of potentially damaging, extremely high current spikes in the charging circuit.
  • Vcc a unique low voltage supply
  • Charger 10 is particularly suitable for charging Ni-Cd battery packs having a wide range of cells, for example, from one to twenty cells without experiencing fluctuations in the level of charging current. For example, as noted above, a current level of 1.7 amps is attained with the described circuit parameters which is sufficient to charge one to twenty cells in about one-hour.
  • the inventive circuit design of charger 10 could be used to provide a single fast or one-hour charging facility for a full line of cordless products which employ batteries of different voltage levels and which include cells in a range from one to twenty. This eliminates the need for a plurality of chargers to accommodate different voltage levels of the full line of such cordless products.
  • switch control performed by SCR 16 would then be performed by the single SCR or dual SCR's in rectifier 14 in a manner similar to the performance of SCR 16.
  • the biasing controls for the SCR's in the rectifier would be the same as that provided for SCR 16.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

Chargeur de batterie (10) comportant un condensateur (20) établissant un niveau de courant suffisant pour charger rapidement une batterie (18), dotée d'une à vingt cellules. Un SCR (redresseur au silicium commandé) (16) est régulé par un chronomètre (16) afin de retarder initialement l'alimentation en courant, tout en déterminant si la batterie (18) est chaude ou froide. Si la batterie (18) est froide, le chargeur (10) procède à une charge rapide de la batterie. Une fois que la batterie (18) est entièrement chargée, elle chauffe à une température à laquelle un thermistor NTC (58) réagit pour déclencher un second chronomètre (52) qui commande le SCR (17) destiné à arrêter l'opération de charge rapide. Le chargeur (10) est ensuite commandé afin d'empêcher que celui-ci ne se remette ensuite en mode de charge rapide. Si la batterie (18) est initialement chaude, le chargeur (10) est commandé pour retarder davantage le déclenchement d'une opération de charge rapide, jusqu'à ce que la batterie refroidisse à ou sous la température de début de charge. Un second thermistor NTC (90) est prévu pour compenser l'effet de potentiel sur le fonctionnement du thermistor (58) en réaction aux niveaux de température émanant de tout environnement autre que la batterie (18).
EP88909024A 1987-09-04 1988-08-29 Chargeur de batterie a reaction thermique Withdrawn EP0377671A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US9343587A 1987-09-04 1987-09-04
US93435 1998-06-08

Publications (1)

Publication Number Publication Date
EP0377671A1 true EP0377671A1 (fr) 1990-07-18

Family

ID=22238935

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88909024A Withdrawn EP0377671A1 (fr) 1987-09-04 1988-08-29 Chargeur de batterie a reaction thermique

Country Status (4)

Country Link
EP (1) EP0377671A1 (fr)
AU (1) AU634465B2 (fr)
CA (1) CA1319736C (fr)
WO (1) WO1989002182A1 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5493199A (en) * 1982-06-07 1996-02-20 Norand Corporation Fast battery charger
US5463305A (en) * 1982-06-07 1995-10-31 Norand Corporation Fast battery charging system and method
US6075340A (en) * 1985-11-12 2000-06-13 Intermec Ip Corp. Battery pack having memory
US6075342A (en) * 1989-12-05 2000-06-13 Intermec Ip Corp. Fast battery charging system and method
CA2022802A1 (fr) * 1989-12-05 1991-06-06 Steven E. Koenck Systeme et methode de charge rapide de batterie
US5187425A (en) * 1990-11-09 1993-02-16 Ast Research, Inc. Rechargeable battery controller
JPH07501650A (ja) * 1991-11-29 1995-02-16 モトローラ・インコーポレイテッド 保護回路付きバッテリ
US6369576B1 (en) 1992-07-08 2002-04-09 Texas Instruments Incorporated Battery pack with monitoring function for use in a battery charging system
US6107802A (en) * 1992-07-08 2000-08-22 Matthews; Wallace Edward Battery pack with monitoring function utilizing association with a battery charging system
FR2705835B1 (fr) * 1993-05-24 1995-06-30 Accumulateurs Fixes Procédé de contrôle de la charge d'accumulateurs étanches au nickel et chargeur utilisant ce procédé.
AT403862B (de) * 1993-09-30 1998-06-25 Philips Electronics Nv Ladeschaltungsausbildung zum zeitgesteuerten aufladen mindestens einer aufladbaren zelle
AU4252997A (en) * 1996-09-19 1998-04-14 Ericsson Inc. Battery charging methods and apparatuses

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1354491A (en) * 1970-07-21 1974-06-05 Accumulateurs Fixes Battery charger
US3917990A (en) * 1974-04-11 1975-11-04 Gen Electric Battery charging control using temperature differential circuit
FR2589292B1 (fr) * 1985-10-25 1994-05-06 Accumulateurs Fixes Et Traction Procede et systeme de recharge de batterie d'accumulateurs, notamment pour batterie de secours d'une alimentation
EP0329658B1 (fr) * 1986-09-29 1994-06-01 Black & Decker Inc. Chargeur de batterie non isole thermosensible

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8902182A1 *

Also Published As

Publication number Publication date
AU2546788A (en) 1989-03-31
AU634465B2 (en) 1993-02-25
WO1989002182A1 (fr) 1989-03-09
CA1319736C (fr) 1993-06-29

Similar Documents

Publication Publication Date Title
US5013993A (en) Thermally responsive battery charger
US4712055A (en) Battery charger circuit
US4177785A (en) Diesel engine glow plug energization control device
EP0801835B1 (fr) Appareil et procede pour fournir une tension d'amorcage a un systeme de batterie rechargeable
US3599071A (en) Thermally-responsive controlled charging arrangement for storage batteries
US5602460A (en) Overcharge current protection circuit and battery pack using same
US7592779B2 (en) Charging device
US5592070A (en) Battery charger having a temperature sensor and a rechargeable battery charging method
US3534241A (en) Battery charger
US5028860A (en) Battery charge apparatus controlled by detecting charge current with constant charge voltage
US5480734A (en) Rechargeable accumulator
EP0377671A1 (fr) Chargeur de batterie a reaction thermique
US5519303A (en) Fast battery charging method and apparatus with temperature gradient detection
US4494162A (en) Starter thermal overload protection system
US5182509A (en) Conditioning and charging circuit for nickel-cadmium batteries
US4283619A (en) Glow plug temperature control apparatus
US4513238A (en) Automatic battery charger with thermal control
US4297630A (en) Timed fast charger
US4544876A (en) Voltage regulator
US6211655B1 (en) Battery charger
US4634834A (en) Temperature controlled electric engine block
US4081660A (en) Heater shutdown circuit
US4129893A (en) Thermoelectric generator overload protective device using hysterisis control
GB2085244A (en) Charging apparatus and method for rechargeable cells
US4360738A (en) Single probe low water control

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19900403

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): CH DE FR GB IT LI NL

17Q First examination report despatched

Effective date: 19920518

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19920929