WO1998033257A1 - Circuit integre controlant un ensemble alimentation electrique et batterie - Google Patents
Circuit integre controlant un ensemble alimentation electrique et batterie Download PDFInfo
- Publication number
- WO1998033257A1 WO1998033257A1 PCT/JP1998/000380 JP9800380W WO9833257A1 WO 1998033257 A1 WO1998033257 A1 WO 1998033257A1 JP 9800380 W JP9800380 W JP 9800380W WO 9833257 A1 WO9833257 A1 WO 9833257A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- voltage
- capacitor
- power supply
- battery
- signal
- Prior art date
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
-
- 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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00302—Overcharge protection
-
- 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
- H02J7/00304—Overcurrent protection
-
- 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
- H02J7/00306—Overdischarge protection
Definitions
- the present invention relates to a power supply monitoring integrated circuit device (hereinafter referred to as "power supply monitoring IC") for monitoring a voltage of a lithium ion battery or the like, and a battery pack provided with the same.
- power supply monitoring IC power supply monitoring integrated circuit device
- the power supply monitoring IC monitors the voltage of a battery such as a lithium ion battery, and controls the battery so that it does not become overcharged or overdischarged. For example, when the battery voltage becomes higher than the overcharge voltage, a control signal is output, and for example, the charging of the battery is prohibited by turning off a switching element connected in series with the battery.
- the overcharge voltage is, for example, 4.2 V.
- a dead time setting circuit as shown in Fig. 3 is provided in the power supply monitoring IC to set a dead time that does not respond to noise (that is, to prevent a control signal due to noise from being generated). Then, the control signal is output when the state in which the detection voltage is higher than the overcharge voltage continues beyond the insensitive time. This prevents erroneous detection.
- a constant current source 1 for outputting a current I 1 is connected via a switching element 2 to a base of a transistor 3c.
- a high-level signal S1 is applied to the switching element.
- the switching element 2 is turned off.
- a switching transistor or the like is used for the switching element 2.
- the emitter of the transistor 3 c is connected to ground, and the collector is connected to the constant current source 4.
- a dead time setting capacitor 5 is connected between the collector of the transistor 3c and ground.
- the non-inverting input terminal (+) of the comparator 6 is connected to the collector of the transistor 3c to detect the voltage of the capacitor 5.
- a voltage higher than the ground level by the insensitive time setting voltage V ref is input to the inverting input terminal (1) of the comparator 6.
- the signal S1 is input when the battery voltage becomes higher than the overcharge voltage.
- Switching element 2 is turned off and transistor 3c is turned off.
- the current I 2 from the constant current source 4 is sent to the capacitor 5 to perform charging.
- the voltage Vc of the capacitor 5 increases linearly.
- the comparator 6 compares the voltage Vc with a predetermined dead time setting voltage Vref, and outputs a high-level signal S2 if the voltage Vc is higher than Vref. On the other hand, if it is low, a low level is output.
- T 1 C ⁇ (V ref -V s at t) / 1 2
- V sat C-V ref / I 2 (However, C is the capacitance of capacitor 5.
- FIG. 6 which is an enlargement of the waveform diagram of FIG. It has been difficult to reduce the time from 00 to 1/100. Therefore, for example, in a device such as a mobile phone having a built-in high-frequency clock, the input voltage V i may be in the state shown in FIG. 7 due to continuous high-frequency noise. At this time, since the charging of the capacitor 5 is started without being sufficiently discharged, the voltage Vc gradually increases, and finally reaches the voltage Vref at the time point t1. As a result, the comparator 6 outputs the high-level signal S2. Thus, high-frequency noise causes malfunctions.
- the voltage Vsat has a temperature-dependent property, and there has been a problem that the setting of the insensitive time is inaccurate due to variations in elements and temperature characteristics. Disclosure of the invention
- An object of the present invention is to provide a power supply monitoring IC and a battery knock that have an increased ability to discharge a dead time setting capacitor while suppressing an increase in circuit current consumption and variations in dead time. I do.
- Another object of the present invention is to provide a power monitoring IC and a battery pack that prevent malfunction due to continuous high-frequency noise.
- a first signal source that supplies a charging current to the capacitor, a transistor that forms a discharge path for the capacitor, and a circuit that outputs a first signal that indicates a discharge path of the capacitor.
- a power supply monitoring integrated circuit device comprising a comparing means, wherein an offset is added to the insensitive time setting voltage by a forward voltage of a diode. .
- the power supply monitoring IC configured as described above monitors the battery.For example, when the battery voltage becomes higher than a predetermined overcharge voltage, the transistor is turned off, and the capacitor is charged using the first current source. Do. As a result, the voltage of the capacitor is gradually increased and compared with the insensitive set time voltage by the comparing means. When the dead time elapses, the capacitor voltage becomes higher than the dead time setting voltage, and the stop signal is output from the comparing means. With this stop signal, the power supply monitoring IC for example turns off the switching element connected in series with the battery and prohibits the use of the battery.
- the capacitor is discharged by the transistor.
- the stop signal is not output from the comparing means for a period shorter than the dead time even if the voltage is higher than the overcharge voltage.
- the offset is added to the voltage for the insensitive setting time by the diode, the temperature characteristic of the discharging transistor can be canceled, and the variation in the insensitive time can be suppressed. .
- the present invention provides a circuit for outputting a first signal indicating whether or not a voltage of a battery has reached a predetermined value or more; a capacitor; a first current source for supplying a charging current to the capacitor; A transistor for forming a discharge path, means for controlling charging and discharging of the capacitor based on the first signal, and comparing the voltage of the capacitor with a predetermined dead time setting voltage to set the dead time of the capacitor.
- a power supply monitoring integrated circuit device comprising: a comparison means for outputting a second signal for stopping the operation of the battery when the voltage exceeds the voltage, wherein a first signal is supplied to an input electrode as a transistor forming the discharge path. It is characterized by using anton-connected transistor.
- FIG. 1 is a circuit diagram of a dead time setting circuit in a power supply monitoring IC of the present invention.
- Fig. 2 is a circuit diagram of a battery pack incorporating the dead time setting circuit.
- Fig. 3 is a circuit diagram of a conventional dead time setting circuit in power supply monitoring IC.
- FIG. 4 is a waveform diagram showing an operation when a battery voltage on which noise is superimposed is input to the circuit of FIG.
- Fig. 5 is a waveform diagram showing the operation when the state where the power supply voltage exceeds the overcharge voltage exceeds the insensitive time.
- Fig. 6 is an enlarged waveform diagram of Fig. 4.
- FIG. 7 is a waveform chart showing an example of erroneous detection due to high-frequency continuous noise.
- FIG. 8 is a waveform chart showing that erroneous detection is prevented when the discharge capacity is high.
- FIG. 1 is a circuit diagram of a power supply monitoring IC insensitive time setting circuit according to the present embodiment.
- FIG. 1 the same parts as those in FIG. 3 are denoted by the same reference numerals, and redundant description will be omitted.
- a constant current source 1 is connected via a switching element 2 to the base of a transistor 3a of a pair of NPNP-type transistors 3a and 3b which are connected in a line.
- a transistor for switching is used for the switching element 2.
- the emitter of transistor 3b is connected to ground.
- the constant current source 4 is connected to the collectors of the transistors 3 a and 3.
- a capacitor 5 for setting the dead time is connected between the collectors of the transistors 3a and 3b and ground.
- the non-inverting input terminal (+) of the comparator 6 is connected to the collectors of the transistors 3a and 3b in order to detect the voltage Vc of the capacitor 5.
- the inverting input terminal (1) of the comparator 6 is obtained by the voltage drop at the resistor R1 by the current I3 from the constant current source 8.
- the dead time setting voltage V ref is input.
- a transistor 7 forming a diode is connected in series with the resistor R 1. The emitter of transistor 7 is grounded, and the base and collector are connected to resistor R1.
- the current I 1 is output from the constant current source 1.
- Signal S1 is generated when the battery voltage is higher than the overcharge voltage.
- Switching element 2 is turned off by signal S1.
- sweep rate pitch ring element 2 is turned on, and through the da one re down tons connected transistor 3 a, 3 b, the discharge current from the capacitor 5/3 2 ⁇ I 1 Flows.
- 3 is the current / width ratio of the transistors 3a and 3b.
- the collector current of the transistor 3c is / 3 ⁇ I1, but in the present embodiment, it is / 3 2 ⁇ I1, so that the discharging capability is increased. Therefore, as shown in FIG. 8, no charge is accumulated in the capacitor 5 even by continuous high-frequency noise, so that malfunction due to erroneous detection is prevented. In addition, since the discharge capability is increased, the current I 1 can be reduced. As a result, the current consumption of the power supply monitoring IC can be reduced.
- the forward voltage of the diode generated by the transistor 7 is added to the insensitive time setting voltage Vref as the offset voltage ⁇ Vf2.
- a Vf 2 A Vfl + Vsat.
- AV fl is the base-emitter evening voltage of the transistor 3 a when the capacitor 5 is discharged.
- Vsat is the collector-emitter voltage of transistor 3b when capacitor 5 discharges.
- T 1 C ⁇ ⁇ (Vref + A Vf2-( ⁇ Vf1 + Vsat)) / I2
- the same dead time T l C-V ref / I 2 is set as in the conventional power supply monitoring IC (Fig. 3). Is done.
- the transistor 7 and the transistor 3b have the effect of canceling the variation of the elements with each other and canceling the temperature characteristics, so that the variation of the insensitive time Is suppressed.
- the dead time can be freely set in the order of tens of milliseconds to several seconds.
- FIG. 2 is a circuit diagram of the battery pack 11.
- Lithium-ion battery 15 has a risk of smoke if overcharged. Therefore, the voltage of battery 15 is monitored by power supply monitoring IC 10 to prevent overcharge.
- the high-potential side of the battery 15 is connected to the terminal T 1 of the power supply monitor I C 10 and the source of the P-channel metal oxide semiconductor field effect transistor (MFET) 12. Then, the drain of the MOSFET 12 is connected to the plus terminal 13 of the battery pack 11.
- the gate of MOSFET12 is connected to the terminal T3 of the power supply monitor IC10, and is turned on / off by the power supply monitor IC10. In this case, the MOSFET 12 is a switching element.
- the low potential side of battery 15 is connected to terminal T 2 of power supply monitor IC 10 and negative terminal 14 of battery pack 11.
- resistors R 2 and R 3 are connected in series to terminals T 1 and T 2.
- the midpoint of connection between resistors R2 and R3 is connected to the non-inverting input terminal (+) of comparator 19.
- a voltage higher than the ground level by the voltage Va is input to the inverting input terminal (1) of the comparator 19.
- the output of comparator 19 is connected to the base of transistor 20.
- the emitter of transistor 20 is connected to ground, and the collector is connected to constant current source 1.
- the collector of transistor 20 is connected to the base of transistor 3a which is connected in Darlington.
- the emitter of transistor 3b connected in Darlington is connected to ground.
- the collectors of the transistors 3 a and 3 b are connected to the constant current source 4.
- a dead time setting capacitor 5 is connected between the collectors of the transistors 3a and 3b and ground.
- the non-inverting input terminal (+) of the comparator 6 is connected to the collectors of the transistors 3a and 3b.
- a dead time setting voltage V ref obtained by a voltage drop at the resistor R 1 by the current I 3 from the constant current source 8 is input.
- a transistor 7 forming a diode is connected as shown so as to be in series with the resistor R 1.
- the output side of the comparator 6 is connected to the buffer circuit 21. No ⁇ ; buffer circuit 2 1 is compared When a high-level signal is input from the switch 6, a control signal is output so as to turn off the MOSFET 12 connected to the terminal T3.
- FIG. 2 the same parts as those in FIG. 1 are denoted by the same reference numerals, and redundant description will be omitted. Note that the insertion position of the switching element formed by the transistor 20 is different from that of FIG.
- the battery pack 11 when the battery 15 is discharged, the battery pack 11 supplies power to a device (not shown) such as a mobile phone or a personal computer connected to the plus terminal 13 and the minus terminal 14. I do. During charging, the battery pack 11 sends current to the battery 15 from a charging DC power supply (not shown) connected to the positive terminal 13 and the negative terminal 14.
- a charging DC power supply (not shown) connected to the positive terminal 13 and the negative terminal 14.
- the comparator 19 determines whether the voltage of the battery 15 is higher than the overcharge voltage. When the voltage of the battery 15 becomes higher than the overcharge voltage, the output of the comparator 19 becomes a high level, and the transistor 20 is turned on. As a result, the current I 1 from the constant current source 1 flows to the transistor 20 and does not flow to the base of the transistor 3 a connected in Spotifyton. Therefore, the transistors 3a and 3b are turned off, the current I2 from the constant current source 4 flows into the capacitor 5, and the capacitor 5 is charged.
- the buffer circuit 21 outputs a control signal based on the signal from the comparator 6 to turn off the MOSFET 12 and cut off the battery 15 from the plus terminal 13. As a result, charging is stopped, and overcharging of the battery 15 is prevented.
- the power supply monitoring IC 10 may detect not only the overcharge voltage of the battery 15 but also the overdischarge voltage and the overcurrent.
- the overdischarge voltage is, for example, 2.2 V. Then, the voltage of the battery 15 is detected, and when the voltage becomes lower than the overdischarge voltage, the MOS FET 12 inserted so as to be in series with the battery 15 is turned off or connected in series with the battery 15. Turn off other MOS FETs and prohibit use of battery 15.
- MOS FET 12 To detect an overcurrent, for example, use a MOS FET 12 to detect the current from the voltage drop of the MOS FET 12 and insert it in series with the battery 15 if the current exceeds a predetermined current value. Turn off the other M ⁇ SFETs to prevent overcurrent.
- the capacitor 5 may be either internal or external to the power supply monitoring IC 10.
- the M ⁇ SFET 12 may have an N-channel MOSFET provided on the negative terminal side (position indicated by A). Further, even when the battery pack 11 monitors and controls the voltages of a plurality of lithium ion batteries, it can be handled by providing a plurality of similar configurations in parallel. Industrial applicability
- the present invention by adding an offset of the same voltage as the voltage of the transistor when discharging the capacitor to the insensitive time setting voltage, it is possible to cancel the variation of the element in the transistor, and Also, since the temperature characteristics are canceled, the dispersion of the set dead time is reduced. Therefore, the present invention is extremely useful for a battery pack that performs monitoring and control of a lithium ion battery, because the battery voltage during charging and discharging of the battery can be accurately monitored and appropriately controlled.
- discharging the capacitor with a transistor connected in series increases the discharge capacity, prevents malfunctions due to continuous high-frequency noise, and reduces the current consumption of the power supply monitoring IC. Therefore, the telephone monitoring IC and the battery pack of the present invention are useful for use in mobile phones and the like.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Power Sources (AREA)
- Protection Of Static Devices (AREA)
- Tests Of Electric Status Of Batteries (AREA)
- Direct Current Feeding And Distribution (AREA)
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019997006466A KR100331949B1 (ko) | 1997-01-29 | 1998-01-28 | 전원감시 ic 및 전지팩 |
EP98901050A EP0999635A4 (en) | 1997-01-29 | 1998-01-28 | INTEGRATED CIRCUIT CONTROLLING A POWER SUPPLY AND BATTERY ASSEMBLY |
US09/341,685 US6154009A (en) | 1997-01-29 | 1998-01-28 | Power supply monitoring IC and battery pack |
CA002278704A CA2278704C (en) | 1997-01-29 | 1998-01-28 | Power supply monitoring ic and battery pack |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9/15099 | 1997-01-29 | ||
JP01509997A JP3753492B2 (ja) | 1997-01-29 | 1997-01-29 | 電源監視ic及び電池パック |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998033257A1 true WO1998033257A1 (fr) | 1998-07-30 |
Family
ID=11879404
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1998/000380 WO1998033257A1 (fr) | 1997-01-29 | 1998-01-28 | Circuit integre controlant un ensemble alimentation electrique et batterie |
Country Status (7)
Country | Link |
---|---|
US (1) | US6154009A (ja) |
EP (1) | EP0999635A4 (ja) |
JP (1) | JP3753492B2 (ja) |
KR (1) | KR100331949B1 (ja) |
CN (1) | CN1246215A (ja) |
CA (1) | CA2278704C (ja) |
WO (1) | WO1998033257A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000059094A2 (en) * | 1999-03-25 | 2000-10-05 | Tyco Electronics Corporation | Devices and methods for protection of rechargeable elements |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6636020B1 (en) | 2002-10-01 | 2003-10-21 | Wilson Greatbatch Technologies, Inc. | Lithium-ion over voltage protection circuit |
US7193828B2 (en) * | 2003-09-11 | 2007-03-20 | Visteon Global Technologies, Inc. | Video protection circuit providing short to battery protection while maintaining termination impedance |
US7425834B2 (en) * | 2005-08-26 | 2008-09-16 | Power Integrations, Inc. | Method and apparatus to select a parameter/mode based on a time measurement |
US20080084182A1 (en) * | 2006-10-06 | 2008-04-10 | Aai Corporation | Lithium battery system |
JP4919847B2 (ja) * | 2007-03-22 | 2012-04-18 | ルネサスエレクトロニクス株式会社 | 過電流検出回路および半導体装置 |
US7750684B2 (en) | 2008-04-18 | 2010-07-06 | Nanya Technology Corp. | Power-on detection circuit for detecting minimum operational frequency |
JP5505678B2 (ja) * | 2008-05-20 | 2014-05-28 | 日立工機株式会社 | 電池パックおよび電池パックを用いた電動工具 |
US8116106B2 (en) | 2008-09-19 | 2012-02-14 | Power Integrations, Inc. | Method and apparatus to select a parameter/mode based on a measurement during an initialization period |
JP2014200164A (ja) * | 2013-03-11 | 2014-10-23 | セイコーインスツル株式会社 | 充放電制御回路、充放電制御装置およびバッテリ装置 |
JP6301188B2 (ja) * | 2014-05-14 | 2018-03-28 | エイブリック株式会社 | 充放電制御回路およびバッテリ装置 |
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GB2051382A (en) * | 1979-04-27 | 1981-01-14 | Tokyo Shibaura Electric Co | Voltage Detecting Circuit |
JPH05111177A (ja) * | 1991-10-17 | 1993-04-30 | Sony Corp | 2次電池の過充電及び過放電防止回路 |
JPH05176479A (ja) * | 1991-12-20 | 1993-07-13 | Fujitsu Ltd | バッテリ過放電防止用バッテリ切離し制御回路 |
JPH07147733A (ja) * | 1993-11-25 | 1995-06-06 | Fuji Elelctrochem Co Ltd | 電池の過放電防止回路およびパック電池 |
JPH0898413A (ja) * | 1994-09-28 | 1996-04-12 | Tec Corp | 電気かみそり |
US5654622A (en) * | 1995-02-16 | 1997-08-05 | Sanyo Electric Co., Ltd. | Secondary battery charging method and apparatus which controls protecting voltage level of battery protecting circuit |
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US4127886A (en) * | 1977-04-21 | 1978-11-28 | Rca Corporation | Over-current protection circuit for voltage regulator |
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DE3686023T2 (de) * | 1985-11-15 | 1993-03-04 | Sanyo Electric Co | Ladevorrichtung. |
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JPH04140923A (ja) * | 1990-10-01 | 1992-05-14 | Sharp Corp | アナログ信号をディジタル信号に変換する識別回路 |
US5547775A (en) * | 1991-04-26 | 1996-08-20 | Sony Corporation | Circuit for preventing overcharge and overdischarge of secondary batteries |
US5259123A (en) * | 1991-05-15 | 1993-11-09 | Foster Wheeler Energy Corporation | Aeration rod-out assembly |
US5530336A (en) * | 1992-09-17 | 1996-06-25 | Sony Corporation | Battery protection circuit |
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US5345192A (en) * | 1993-01-29 | 1994-09-06 | Sgs-Thomson Microelectronics, Inc. | Voltage controlled integrated circuit for biasing an RF device |
JP3118387B2 (ja) * | 1995-02-16 | 2000-12-18 | 三洋電機株式会社 | 二次電池の充電方法及び充電装置 |
JP3239040B2 (ja) * | 1995-04-11 | 2001-12-17 | 三洋電機株式会社 | 二次電池の充電方法 |
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1997
- 1997-01-29 JP JP01509997A patent/JP3753492B2/ja not_active Expired - Fee Related
-
1998
- 1998-01-28 US US09/341,685 patent/US6154009A/en not_active Expired - Fee Related
- 1998-01-28 KR KR1019997006466A patent/KR100331949B1/ko not_active IP Right Cessation
- 1998-01-28 CN CN98802168A patent/CN1246215A/zh active Pending
- 1998-01-28 EP EP98901050A patent/EP0999635A4/en not_active Withdrawn
- 1998-01-28 CA CA002278704A patent/CA2278704C/en not_active Expired - Fee Related
- 1998-01-28 WO PCT/JP1998/000380 patent/WO1998033257A1/ja not_active Application Discontinuation
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GB2051382A (en) * | 1979-04-27 | 1981-01-14 | Tokyo Shibaura Electric Co | Voltage Detecting Circuit |
JPH05111177A (ja) * | 1991-10-17 | 1993-04-30 | Sony Corp | 2次電池の過充電及び過放電防止回路 |
JPH05176479A (ja) * | 1991-12-20 | 1993-07-13 | Fujitsu Ltd | バッテリ過放電防止用バッテリ切離し制御回路 |
JPH07147733A (ja) * | 1993-11-25 | 1995-06-06 | Fuji Elelctrochem Co Ltd | 電池の過放電防止回路およびパック電池 |
JPH0898413A (ja) * | 1994-09-28 | 1996-04-12 | Tec Corp | 電気かみそり |
US5654622A (en) * | 1995-02-16 | 1997-08-05 | Sanyo Electric Co., Ltd. | Secondary battery charging method and apparatus which controls protecting voltage level of battery protecting circuit |
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Title |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6914416B2 (en) | 1998-04-15 | 2005-07-05 | Tyco Electronics Corporation | Electrical device including a voltage regulator mounted on a variable resistor |
WO2000059094A2 (en) * | 1999-03-25 | 2000-10-05 | Tyco Electronics Corporation | Devices and methods for protection of rechargeable elements |
WO2000059094A3 (en) * | 1999-03-25 | 2001-04-26 | Tyco Electronics Corp | Devices and methods for protection of rechargeable elements |
Also Published As
Publication number | Publication date |
---|---|
EP0999635A4 (en) | 2000-11-02 |
CA2278704C (en) | 2001-10-09 |
CN1246215A (zh) | 2000-03-01 |
JPH10215518A (ja) | 1998-08-11 |
KR100331949B1 (ko) | 2002-04-09 |
KR20000070239A (ko) | 2000-11-25 |
JP3753492B2 (ja) | 2006-03-08 |
CA2278704A1 (en) | 1998-07-30 |
EP0999635A1 (en) | 2000-05-10 |
US6154009A (en) | 2000-11-28 |
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