US20050024017A1 - Battery charging apparatus - Google Patents
Battery charging apparatus Download PDFInfo
- Publication number
- US20050024017A1 US20050024017A1 US10/895,221 US89522104A US2005024017A1 US 20050024017 A1 US20050024017 A1 US 20050024017A1 US 89522104 A US89522104 A US 89522104A US 2005024017 A1 US2005024017 A1 US 2005024017A1
- Authority
- US
- United States
- Prior art keywords
- transistor
- battery
- current
- charging
- voltage
- 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.)
- Abandoned
Links
- 230000000903 blocking effect Effects 0.000 claims 1
- 229910001416 lithium ion Inorganic materials 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000003111 delayed effect Effects 0.000 description 2
- 101000807306 Homo sapiens Ubiquitin-like modifier-activating enzyme 1 Proteins 0.000 description 1
- 102100037160 Ubiquitin-like modifier-activating enzyme 1 Human genes 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- RVPVRDXYQKGNMQ-UHFFFAOYSA-N lead(2+) Chemical compound [Pb+2] RVPVRDXYQKGNMQ-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
Images
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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
-
- 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
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
Definitions
- the present invention relates to an apparatus for charging a battery or a battery charging circuit.
- This battery charging circuit is especially suitable for charging batteries, whose charging can run under voltage control, like, for example, the case of lithium ion and lead batteries.
- the apparatus according to the invention for charging a battery has a first transistor, through which a charging current passes into the battery connected to the charging apparatus.
- a current source is connected to a control input of this first transistor to supply a control current to it. This current source adjusts or sets the control current for the first transistor so that the first transistor shuts off the charging current to the battery when a predetermined maximum charging or supply voltage is reached at the battery.
- the apparatus of the present invention is embodied as a charging circuit, which is made from very small and also low-cost components.
- a great simplification of the circuitry results when a Zener diode is connected to the control input of the first transistor. As soon as the charging voltage of the battery at the first transistor has reached a maximum value, the Zener voltage of the Zener diode is exceeded so that the control current no longer flows to the control input of the first transistor, but away through the Zener diode.
- a very high charging current can flow when the charging process is initiated, which could close or turn on the second transistor and thus interrupt the charging process.
- the control input of the second transistor is connected to an R/C circuit means for delaying the switching on of the second transistor.
- the current source works with reduced circuit work because several diodes are connected in series in a circuit branch through which the charging current is conducted and the current source picks off or taps the voltage drop across the diodes.
- the circuit shown in the drawing for charging a battery has two input terminals 1 and 2 , to which an unshown power supply is connectable and two output terminals 3 and 4 , to which the battery B to be charged is connected.
- the battery B to be charged is a lithium ion battery.
- the output terminal 3 is connected to the plus terminal of the battery B and the output terminal 4 is grounded.
- a plurality of diodes D 1 , D 2 and D 3 and a first transistor TI are connected in series between the input terminal 1 and the output terminal 3 .
- the first transistor T 1 is connected in this series circuit branch so the charging current is supplied through its collector-emitter path to the battery B.
- the second input terminal 2 and the second output terminal 4 are both connected to ground.
- resistors can be used instead of diodes.
- diodes have the advantage that the diode voltage is always constant, independent of charging current. This is usually not the case with conventional ohmic resistors. Also resistors heat up with high charging current.
- the current source has two transistors T 3 and T 4 .
- the base of the transistor T 3 is connected with the collector of the transistor T 4 and the base of the collector T 4 is connected with the emitter of the transistor T 3 .
- the emitter of the transistor T 4 is connected with the control input (base) of the first transistor T 1 .
- the collector of the transistor T 3 is connected with the input terminal 1 .
- the base of the transistor T 3 is also connected by means of a resistor R 1 with the input terminal 1 .
- the emitter of the transistor T 2 and the base of the transistor T 4 are connected via a resistor R 2 to the control input of the transistor T 1 .
- Another diode D 4 is connected between the input terminal 1 and the collector of the transistor T 3 .
- This diode D 4 acts as a polarity protector in a known manner.
- the current source comprising the transistors T 3 and T 4 and resistors R 1 and R 2 , as subsequently described, adjusts the control current supplied to the control input of the first transistor T 1 , so that the first transistor disconnects the battery B, when a predetermined maximum charging or supply voltage is reached at the battery, and thus interrupts the charging current from input terminal 1 to the output terminal 3 .
- a Zener diode ZD added between the control input of the first transistor T 1 and ground in cooperation with the above-described current source causes the first transistor to become non-conducting when the battery reaches a predetermined maximum supply voltage and thus the charging current is interrupted.
- the control current supplied by the current source flows nearly completely into the control input (base) of the first transistor and it remains conducting. Only a small portion of the control current flows through a resistor R 3 connected to ground and parallel to the Zener diode ZD.
- the base-emitter voltage UBEL of the first transistor T 1 i.e. a value corresponding to the Zener voltage ZD
- a large portion of the control current supplied by the current source by means of the Zener diode ZD flows to ground. That means that the control current for the first transistor is so small that it is no longer sufficient to keep the first transistor T 1 conducting. Then the first transistor T 1 opens or becomes non-conducting and interrupts the charging current to the battery B.
- An R/C circuit part which comprises a resistor R 4 and capacitor C, connects a base of a second transistor T 2 to the collector of the first transistor T 1 .
- the emitter of the second transistor T 2 is connected with the base of the first transistor T 1 and its collector is connected with the current source. If now, as described previously, the maximum supply voltage is reached, the control current at the base of the first transistor T 1 decreases, so that the voltage drop across the collector and base of this first transistor T 1 increases. As a result, this voltage switches on the second transistor T 2 and also the transistor T 3 of the current source.
- the current source switches off the control current for the first transistor T 1 .
- the second transistor T 2 which forms a voltage divider together with the resistors R 1 and R 3 , determines the voltage at the base of the first transistor T 1 .
- the dimensions of the resistors R 1 , R 3 and the transistor T 2 are selected so that the voltage at the base of the first transistor T 1 is clearly less than the plus potential at the output terminal 3 connected to the battery B. Thus the base-emitter path of the transistor T 1 is reliably blocked. No more current can flow into the charged battery B.
- the R/C circuit part connected to the base of the second transistor T 2 causes a delayed switching on of the second transistor T 2 . Because the turn-on of the second transistor T 2 is delayed, the second transistor is blocked and the current source is prevented from being turned off, in cases in which a higher charging current should flow when the charging apparatus is turned on.
- the battery B comprises e.g. a lithium ion cell
- a typical base-emitter voltage of the first transistor T 1 of ⁇ 5 V suffices for the charging process.
- the shut off voltage for the first transistor T 1 is typically about ⁇ 4.1 V.
- Zener diode ZD It is advantageous to replace the single Zener diode ZD by a plurality of Zener diodes connected in series each with smaller Zener voltage in other embodiments, which have not been shown in the drawing. These Zener diodes have negative temperature coefficients, which compensates for the temperature behavior of the base-emitter voltage UBEL of first transistor T 1 and diode D 4 .
- a reference voltage for switching off the first transistor T 1 can be produced with other circuit means instead of the Zener voltage of a Zener diode.
- German Patent Application 103 35 018.7 of Jul. 31, 2003 is incorporated here by reference.
- This German Patent Application describes the invention described hereinabove and claimed in the claims appended hereinbelow and provides the basis for a claim of priority for the instant invention under 35 U.S.C. 119.
Abstract
The battery charging apparatus is made with small and low-cost components. It includes a first transistor (T1) with a control input through which the charging current flows into a battery (B) and a current source (T3, T4, R1, R2) for a control current flowing to the control input of the first transistor. The current source sets or adjusts the control current so that the first transistor is non-conducting or blocked and the charging current flowing into the battery is shut off when a predetermined maximum charging voltage is reached at the battery.
Description
- The present invention relates to an apparatus for charging a battery or a battery charging circuit. This battery charging circuit is especially suitable for charging batteries, whose charging can run under voltage control, like, for example, the case of lithium ion and lead batteries.
- It is an object of the present invention to provide a miniaturized and inexpensive charging apparatus for charging a rechargeable battery, such as a lead or lithium ion battery.
- The apparatus according to the invention for charging a battery has a first transistor, through which a charging current passes into the battery connected to the charging apparatus. A current source is connected to a control input of this first transistor to supply a control current to it. This current source adjusts or sets the control current for the first transistor so that the first transistor shuts off the charging current to the battery when a predetermined maximum charging or supply voltage is reached at the battery.
- The apparatus of the present invention is embodied as a charging circuit, which is made from very small and also low-cost components.
- Further advantageous embodiments are characterized by features claimed in the appended dependent claims.
- In preferred embodiments a great simplification of the circuitry results when a Zener diode is connected to the control input of the first transistor. As soon as the charging voltage of the battery at the first transistor has reached a maximum value, the Zener voltage of the Zener diode is exceeded so that the control current no longer flows to the control input of the first transistor, but away through the Zener diode.
- In further preferred embodiments it is appropriate to connect a second transistor to the first transistor, which keeps the control input of the first transistor at a potential, which is less than the charging voltage of the battery connected to the first transistor after shut off of the first transistor. Because of that in no case will even a small amount of charging current flow into the battery after shut off of the charging current through the first transistor.
- A very high charging current can flow when the charging process is initiated, which could close or turn on the second transistor and thus interrupt the charging process. In order to prevent that occurrence the control input of the second transistor is connected to an R/C circuit means for delaying the switching on of the second transistor.
- The current source works with reduced circuit work because several diodes are connected in series in a circuit branch through which the charging current is conducted and the current source picks off or taps the voltage drop across the diodes.
- The objects, features and advantages of the invention will now be illustrated in more detail with the aid of the following description of the preferred embodiments, with reference to the sole figure, which is a schematic circuit diagram of a circuit arrangement for charging a rechargeable battery according to the invention.
- The circuit shown in the drawing for charging a battery has two
input terminals 1 and 2, to which an unshown power supply is connectable and twooutput terminals 3 and 4, to which the battery B to be charged is connected. For example, the battery B to be charged is a lithium ion battery. Theoutput terminal 3 is connected to the plus terminal of the battery B and the output terminal 4 is grounded. A plurality of diodes D1, D2 and D3 and a first transistor TI are connected in series between the input terminal 1 and theoutput terminal 3. The first transistor T1 is connected in this series circuit branch so the charging current is supplied through its collector-emitter path to the battery B. Thesecond input terminal 2 and the second output terminal 4 are both connected to ground. - The series circuit branch including diodes D1, D2 and D3, to which a current source is connected, causes a voltage drop in the charging current path. Also resistors can be used instead of diodes. Generally diodes have the advantage that the diode voltage is always constant, independent of charging current. This is usually not the case with conventional ohmic resistors. Also resistors heat up with high charging current.
- The current source has two transistors T3 and T4. The base of the transistor T3 is connected with the collector of the transistor T4 and the base of the collector T4 is connected with the emitter of the transistor T3. The emitter of the transistor T4 is connected with the control input (base) of the first transistor T1. The collector of the transistor T3 is connected with the input terminal 1. Furthermore the base of the transistor T3 is also connected by means of a resistor R1 with the input terminal 1. The emitter of the transistor T2 and the base of the transistor T4 are connected via a resistor R2 to the control input of the transistor T1. Another diode D4 is connected between the input terminal 1 and the collector of the transistor T3. This diode D4 acts as a polarity protector in a known manner. The current source comprising the transistors T3 and T4 and resistors R1 and R2, as subsequently described, adjusts the control current supplied to the control input of the first transistor T1, so that the first transistor disconnects the battery B, when a predetermined maximum charging or supply voltage is reached at the battery, and thus interrupts the charging current from input terminal 1 to the
output terminal 3. - A Zener diode ZD added between the control input of the first transistor T1 and ground in cooperation with the above-described current source causes the first transistor to become non-conducting when the battery reaches a predetermined maximum supply voltage and thus the charging current is interrupted. As long as the battery voltage at the
output terminal 3 is less than the base-emitter voltage UBE1 of the first transistor T1, i.e. the Zener voltage of the Zener diode ZD, the control current supplied by the current source flows nearly completely into the control input (base) of the first transistor and it remains conducting. Only a small portion of the control current flows through a resistor R3 connected to ground and parallel to the Zener diode ZD. As soon as the battery charging voltage at theoutput terminal 3 has reached the base-emitter voltage UBEL of the first transistor T1, i.e. a value corresponding to the Zener voltage ZD, a large portion of the control current supplied by the current source by means of the Zener diode ZD flows to ground. That means that the control current for the first transistor is so small that it is no longer sufficient to keep the first transistor T1 conducting. Then the first transistor T1 opens or becomes non-conducting and interrupts the charging current to the battery B. - An R/C circuit part, which comprises a resistor R4 and capacitor C, connects a base of a second transistor T2 to the collector of the first transistor T1. This guarantees that the first transistor T1 is no longer conducting when a predetermined maximum supply voltage is reached at the battery B and thus no charging current is supplied to the battery B. The emitter of the second transistor T2 is connected with the base of the first transistor T1 and its collector is connected with the current source. If now, as described previously, the maximum supply voltage is reached, the control current at the base of the first transistor T1 decreases, so that the voltage drop across the collector and base of this first transistor T1 increases. As a result, this voltage switches on the second transistor T2 and also the transistor T3 of the current source. The current source switches off the control current for the first transistor T1. Also now the second transistor T2, which forms a voltage divider together with the resistors R1 and R3, determines the voltage at the base of the first transistor T1. The dimensions of the resistors R1, R3 and the transistor T2 are selected so that the voltage at the base of the first transistor T1 is clearly less than the plus potential at the
output terminal 3 connected to the battery B. Thus the base-emitter path of the transistor T1 is reliably blocked. No more current can flow into the charged battery B. - The R/C circuit part connected to the base of the second transistor T2 causes a delayed switching on of the second transistor T2. Because the turn-on of the second transistor T2 is delayed, the second transistor is blocked and the current source is prevented from being turned off, in cases in which a higher charging current should flow when the charging apparatus is turned on.
- When the battery B comprises e.g. a lithium ion cell, a typical base-emitter voltage of the first transistor T1 of −5 V suffices for the charging process. The shut off voltage for the first transistor T1 is typically about −4.1 V. With two or more battery cells connected in series either a diode (not shown in the drawing) must be connected between the emitter of the first transistor T1 and the battery B, or a first transistor T1 with a higher permissible base-emitter voltage must be used.
- It is advantageous to replace the single Zener diode ZD by a plurality of Zener diodes connected in series each with smaller Zener voltage in other embodiments, which have not been shown in the drawing. These Zener diodes have negative temperature coefficients, which compensates for the temperature behavior of the base-emitter voltage UBEL of first transistor T1 and diode D4.
- Also in other unshown embodiments a reference voltage for switching off the first transistor T1 can be produced with other circuit means instead of the Zener voltage of a Zener diode.
- The disclosure in German Patent Application 103 35 018.7 of Jul. 31, 2003 is incorporated here by reference. This German Patent Application describes the invention described hereinabove and claimed in the claims appended hereinbelow and provides the basis for a claim of priority for the instant invention under 35 U.S.C. 119.
- While the invention has been illustrated and described as embodied in a battery charging apparatus, it is not intended to be limited to the details shown, since various modifications and changes may be made without departing in any way from the spirit of the present invention.
- Without further analysis, the foregoing will so fully reveal the gist of the present invention that others can, by applying current knowledge, readily adapt it for various applications without omitting features that, from the standpoint of prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention.
- What is claimed is new and is set forth in the following appended claims.
Claims (5)
1. An apparatus for charging a battery, said apparatus comprising
a first transistor (T1) with a control input, through which a charging current flows to a battery (B) connected to the first transistor when said battery (B) is being charged; and
a current source (T3, T4, R1, R2) for a control current for said first transistor, said current source being connected to the control input of the first transistor (T1) to supply said control current;
wherein said current source comprises means for adjusting or setting said control current, so that the first transistor is non-conducting or blocked and said charging current flowing into said battery is shut off when a predetermined maximum charging voltage at said battery is reached.
2. The apparatus as defined in claim 1 , further comprising a Zener diode (ZD) connected to the control input of the first transistor (T1), said Zener diode having a Zener voltage that is exceeded so that the control current no longer flows from said current source (T3, T4, R1, R2) to the control input of the first transistor (T1) but flows away through the Zener diode (ZD), as soon as said predetermined maximum charging voltage at said battery is reached.
3. The apparatus as defined in claim 1 , further comprising a second transistor (T2) connected to said first transistor (T1), and wherein said second transistor keeps said control input of the first transistor (T1) at a potential that is less than the charging voltage of said battery (B) connected to the first transistor (T1) after blocking the first transistor (T1).
4. The apparatus as defined in claim 3 , further comprising R/C circuit means (R4,C) for delaying a switching on of the second transistor (T2) and wherein said R/C circuit means is connected to a control input of the second transistor (T2).
5. The apparatus according to claim 1 , further comprising a series circuit branch comprising a plurality of diodes (D1, D2, D3) and said first transistor (T1) connected in series with each other, and wherein said current source (T3, T4, R1, R2) is connected across said series circuit branch so that a voltage drop across said diodes drives said current source (T3, T4, R1, R2).
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/263,805 US8018201B2 (en) | 2003-07-31 | 2008-11-03 | Battery charging apparatus |
US13/178,382 US20110267010A1 (en) | 2003-07-31 | 2011-07-07 | Battery charging apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10335018A DE10335018B4 (en) | 2003-07-31 | 2003-07-31 | Device for charging a battery |
DE10335018.7 | 2003-07-31 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/263,805 Continuation US8018201B2 (en) | 2003-07-31 | 2008-11-03 | Battery charging apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
US20050024017A1 true US20050024017A1 (en) | 2005-02-03 |
Family
ID=32946489
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/895,221 Abandoned US20050024017A1 (en) | 2003-07-31 | 2004-07-20 | Battery charging apparatus |
US12/263,805 Active US8018201B2 (en) | 2003-07-31 | 2008-11-03 | Battery charging apparatus |
US13/178,382 Abandoned US20110267010A1 (en) | 2003-07-31 | 2011-07-07 | Battery charging apparatus |
Family Applications After (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/263,805 Active US8018201B2 (en) | 2003-07-31 | 2008-11-03 | Battery charging apparatus |
US13/178,382 Abandoned US20110267010A1 (en) | 2003-07-31 | 2011-07-07 | Battery charging apparatus |
Country Status (5)
Country | Link |
---|---|
US (3) | US20050024017A1 (en) |
CN (1) | CN1581634B (en) |
DE (2) | DE20321116U1 (en) |
FR (1) | FR2858485B1 (en) |
GB (1) | GB2404504B (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090009139A1 (en) * | 2007-07-06 | 2009-01-08 | Jochen Bertsch | Accumulator with an adaptable charge shutoff voltage |
US20100181968A1 (en) * | 2009-01-16 | 2010-07-22 | Hon Hai Precision Industry Co., Ltd. | Battery charger with overvoltage protection circuitry |
US20110025274A1 (en) * | 2008-04-23 | 2011-02-03 | Steffen Kunkel | Energy accumulator |
CN103840498A (en) * | 2012-11-22 | 2014-06-04 | 国基电子(上海)有限公司 | Handset pre-charging circuit |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009045111A1 (en) | 2009-09-29 | 2011-03-31 | Robert Bosch Gmbh | Device for charging a battery |
DE102010040544A1 (en) | 2010-09-10 | 2012-03-15 | Robert Bosch Gmbh | Circuit arrangement for charging starter battery of motor car, has phase-shift transformer for comparing applied voltage with reference voltage and switching charging transistor to closed state when applied voltage exceeds reference voltage |
TWI531156B (en) | 2013-03-11 | 2016-04-21 | 立錡科技股份有限公司 | Power converter control circuit |
CN103795110A (en) * | 2014-01-21 | 2014-05-14 | 超威电源有限公司 | Gel battery charging adapter |
CN105873280A (en) * | 2016-05-20 | 2016-08-17 | 上海顿格电子贸易有限公司 | System and method for switched lighting of lamps |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3771043A (en) * | 1971-12-20 | 1973-11-06 | S & C Electric Co | System for powering a combination of variable burden and fixed burden voltage dependent loads from a high impedance source |
US4359655A (en) * | 1979-05-10 | 1982-11-16 | Sony Corporation | Timer circuit |
US4390828A (en) * | 1982-03-17 | 1983-06-28 | Transaction Control Industries | Battery charger circuit |
US4394613A (en) * | 1981-01-19 | 1983-07-19 | California Institute Of Technology | Full-charge indicator for battery chargers |
US4468605A (en) * | 1982-04-12 | 1984-08-28 | Motorola, Inc. | Timed voltage clamp for battery charger |
US6492792B1 (en) * | 2002-05-26 | 2002-12-10 | Motorola, Inc | Battery trickle charging circuit |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
LU54416A1 (en) * | 1966-09-26 | 1967-11-03 | ||
US3735233A (en) * | 1970-08-24 | 1973-05-22 | Globe Union Inc | Battery charger apparatus having multiple modes of operation and automatic switching therebetween |
DE9209120U1 (en) * | 1992-07-08 | 1992-09-10 | E. Lead Electronic Co. Ltd., Chang Hua, Tw |
-
2003
- 2003-07-31 DE DE20321116U patent/DE20321116U1/en not_active Expired - Lifetime
- 2003-07-31 DE DE10335018A patent/DE10335018B4/en not_active Expired - Lifetime
-
2004
- 2004-07-02 CN CN2004100620744A patent/CN1581634B/en active Active
- 2004-07-20 US US10/895,221 patent/US20050024017A1/en not_active Abandoned
- 2004-07-29 FR FR0451699A patent/FR2858485B1/en active Active
- 2004-07-29 GB GB0416997A patent/GB2404504B/en active Active
-
2008
- 2008-11-03 US US12/263,805 patent/US8018201B2/en active Active
-
2011
- 2011-07-07 US US13/178,382 patent/US20110267010A1/en not_active Abandoned
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3771043A (en) * | 1971-12-20 | 1973-11-06 | S & C Electric Co | System for powering a combination of variable burden and fixed burden voltage dependent loads from a high impedance source |
US4359655A (en) * | 1979-05-10 | 1982-11-16 | Sony Corporation | Timer circuit |
US4394613A (en) * | 1981-01-19 | 1983-07-19 | California Institute Of Technology | Full-charge indicator for battery chargers |
US4390828A (en) * | 1982-03-17 | 1983-06-28 | Transaction Control Industries | Battery charger circuit |
US4468605A (en) * | 1982-04-12 | 1984-08-28 | Motorola, Inc. | Timed voltage clamp for battery charger |
US6492792B1 (en) * | 2002-05-26 | 2002-12-10 | Motorola, Inc | Battery trickle charging circuit |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090009139A1 (en) * | 2007-07-06 | 2009-01-08 | Jochen Bertsch | Accumulator with an adaptable charge shutoff voltage |
US20110025274A1 (en) * | 2008-04-23 | 2011-02-03 | Steffen Kunkel | Energy accumulator |
US20100181968A1 (en) * | 2009-01-16 | 2010-07-22 | Hon Hai Precision Industry Co., Ltd. | Battery charger with overvoltage protection circuitry |
US8143864B2 (en) * | 2009-01-16 | 2012-03-27 | Hon Hai Precision Industry Co., Ltd. | Battery charger with overvoltage protection circuitry |
CN103840498A (en) * | 2012-11-22 | 2014-06-04 | 国基电子(上海)有限公司 | Handset pre-charging circuit |
Also Published As
Publication number | Publication date |
---|---|
GB0416997D0 (en) | 2004-09-01 |
US20110267010A1 (en) | 2011-11-03 |
DE10335018B4 (en) | 2007-12-06 |
US20090051328A1 (en) | 2009-02-26 |
DE20321116U1 (en) | 2005-12-22 |
FR2858485A1 (en) | 2005-02-04 |
CN1581634A (en) | 2005-02-16 |
DE10335018A1 (en) | 2005-02-24 |
GB2404504B (en) | 2005-11-09 |
CN1581634B (en) | 2010-05-26 |
US8018201B2 (en) | 2011-09-13 |
GB2404504A (en) | 2005-02-02 |
FR2858485B1 (en) | 2009-03-06 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US8018201B2 (en) | Battery charging apparatus | |
US5705911A (en) | Charging circuit | |
US5087871A (en) | Power supply with inrush current limiter | |
EP0789947B1 (en) | Protection switch for a battery powered device | |
US6989981B2 (en) | Battery over voltage and over protection circuit and adjustable adapter current limit circuit | |
US4686444A (en) | Battery charging circuit | |
US20240113514A1 (en) | Protection circuit for battery management system | |
US20200144841A1 (en) | Battery pack and discharge method for limiting an excessive discharge current | |
JP3728920B2 (en) | Battery protection circuit | |
US20050116764A1 (en) | Driving circuit for field effect transistor | |
KR20190094025A (en) | Battery protection circuit and battery pack having same | |
US20210167592A1 (en) | Current limiting circuits | |
KR100241906B1 (en) | Apparatus for charging a secondary battery | |
RU2690838C1 (en) | Protective device | |
JP2611859B2 (en) | Power output cutoff device | |
US7589501B2 (en) | Apparatus and method for protecting secondary battery | |
CA1206639A (en) | Current limiter for telephone signalling | |
US7944665B2 (en) | Control and protection system for an output of automation equipment | |
EP4152616A1 (en) | Relay drive circuit and battery system comprising same | |
CN211831276U (en) | LED drive circuit with battery under-voltage protection | |
EP4293865A1 (en) | Driving circuit applied to protection switch of battery module | |
US5714867A (en) | Termination at preset voltage level | |
KR102064480B1 (en) | Reverse voltage protecting circuit for power conversion device and the reverse voltage protecting method using the same | |
JP2001352669A (en) | Rush-current suppression circuit | |
KR900009225Y1 (en) | Control circuit of charge of battery |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: ROBERT BOSCH GMBH, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:LOHT, GUENTER;REEL/FRAME:015199/0040 Effective date: 20040623 |
|
AS | Assignment |
Owner name: ROBERT BOSCH GMBH, GERMANY Free format text: CORRECTED RECORDATION FORM;ASSIGNOR:LOHR, GUENTER;REEL/FRAME:015226/0656 Effective date: 20040623 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- AFTER EXAMINER'S ANSWER OR BOARD OF APPEALS DECISION |