EP0960458A1 - Circuit arrangement for preventing deep discharge of a battery - Google Patents
Circuit arrangement for preventing deep discharge of a batteryInfo
- Publication number
- EP0960458A1 EP0960458A1 EP98901985A EP98901985A EP0960458A1 EP 0960458 A1 EP0960458 A1 EP 0960458A1 EP 98901985 A EP98901985 A EP 98901985A EP 98901985 A EP98901985 A EP 98901985A EP 0960458 A1 EP0960458 A1 EP 0960458A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- interrupt
- voltage
- printed circuit
- battery
- circuit board
- 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- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
-
- 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
Definitions
- the present invention relates to a printed circuit board arrangement
- a printed circuit board arrangement comprising a circuit board provided with a first and a second connector for connecting the printed circuit board to a battery, an interrupt circuit comprising a first and a second input connected to said connectors, means for measuring battery voltage, an output for feeding a predetermined interrupt signal when the battery voltage is lower than a predetermined voltage level, a power supply module attached to the printed circuit board, said power supply module comprising a first and a second input connected to said connectors, means for producing operating voltage from the battery voltage transmitted through said inputs to be fed to the printed circuit board, and an interrupt input responsive to the output of the interrupt circuit for interrupting the operating voltage feed in response to the interrupt signal.
- the invention particularly relates to preventing the undervoltage operation of battery-operated telecommunications devices, but the invention can also be applied in other conditions.
- the operation of the battery-operated device utilizing it should be interrupted in case the battery voltage Tails below a predetermined limit; otherwise deep discharge may damage the battery.
- the limit value of the voltage at which the loading of the battery must be stopped depends, among other things, on the nominal voltage of said battery, in other words the limit values for stopping the loading of a 24V and a 48V battery deviate from each other, for example.
- a previously known printed circuit board comprises an interrupt cir- cuit for controlling the voltage obtained from the battery to a power supply module on the printed circuit board and for interrupting the operation of the power supply module when the battery voltage falls below a predetermined limit.
- the power supply module has to be changed to correspond to the battery voltage in use at each particular time.
- the problem resides in the interrupt circuit on the printed circuit board, designed to interrupt the operation of the power supply module on reaching a predetermined voltage rating. If the battery voltage thus exceeds the limit for which the interrupt circuit is designed, for example, the interrupt circuit is unable to function in a desired manner, since the limit of the interrupt circuit cannot be reached until the battery has already undergone deep discharge.
- the object of the present invention is to solve the above problem and to provide a solution by which a given printed circuit board and the interrupt circuit thereof can be operated at several different battery voltages for preventing undervoltage battery operation with no need of manual adjustment or replacement of the interrupt circuit, for instance.
- the printed circuit board arrangement of the invention which is characterized in that the power supply module comprises a control output connected to a control input of an interrupt circuit for feeding a predetermined control signal to the interrupt circuit, said control signal indicating to the interrupt circuit said pre- determined voltage level at which the interrupt circuit feeds the interrupt signal to the power supply module.
- the invention is based on the idea that providing the power supply module with a control output connected to a control input of the interrupt circuit allows the power supply module to use a control signal to indicate to the inter- rupt circuit the voltage level at which the loading of the battery should be interrupted.
- the same interrupt circuit can be utilized at several different battery voltages, since the operation of the interrupt circuit is dependent on the control o ⁇ Jhe power supply module;
- the power supply module has to be chosen case by case to correspond to the nominal voltage of the battery used, whereby the necessarily required parts for feeding the proper control signal to the interrupt circuit can be integrated into the power supply modules operating at different battery voltages.
- the most essential advantage of the printed circuit board of the invention is that the same printed circuit board and the interrupt circuit thereof can be utilized at different battery voltages with no need to adjust the interrupt circuit.
- the same printed circuit board and the same interrupt circuit being applicable more widely affords a smaller number of variations of requisite printed circuit boards and interrupt circuits.
- Figure 1 shows two identical printed circuit boards 1 each compris- ing identical interrupt circuits 2.
- a 24V nominal voltage battery 5 is connected to the upper printed circuit board by connectors 3 and 4.
- a 48V nominal volt- age battery 6 is similarly connected to the lower printed circuit board by connectors 3 and 4.
- a power supply module corresponding to the nominal voltage of the battery connected to said printed circuit board is to be chosen in a manner known per se. Consequently, a power supply module 17 operating at a 24V primary voltage and comprising a first input 7 connected to the connector 3 and a second input 10 connected to the connector 4 is attached to the upper printed circuit board.
- a power supply module 18 operating at a 48V primary voltage and comprising a first input 7 connected to the connector 3 and comprising a second input 10 connected to the connector 4 is similarly attached to the lower printed circuit board.
- the power supply modules 17 and 18 can be of any type known per se, for instance switched-mode power supplies.
- the power supply modules can be attached to the printed circuit boards 1 for instance by quick-disconnect connectors.
- the power supply module 17 of the upper printed circuit board for example, can thus be detached and replaced by another power supply module, provided that another batten/ of a nominal voltage deviant ⁇ rom the nominal voltage of battery 5 is connected to the upper printed circuit board.
- the output voltage Uout obtained from the outputs 1 and 12 of the power supply of both the upper and the lower printed circuit board is identical, for instance 3.3V.
- the same operating voltage is provided on the upper and the lower printed circuit boards, independently of the nominal voltage of the battery connected to said printed circuit boards.
- an interrupt circuit 2 comprising a first 15 and a second 16 input connected to the connectors 3 and 4 is arranged on the printed circuit boards 1.
- the interrupt circuit further comprises a control input 13 connected to a control output 8 of the power supply module.
- the power supply module can use a control signal fed through the control input to control the interrupt circuit in such a way that the interrupt circuit is able to interrupt the operation of the power supply module at a proper voltage level dependent on the battery in use.
- Figure 1 shows that in the power supply module 17 attached to the upper printed circuit board, the input 7 and the control output 8 are intercon- nected whereas they are not interconnected in the power supply module 18 of the lower printed circuit board.
- the power supply modules 17 and 18 feed a different control signal to the interrupt circuits 2, whereby the interrupt circuits 2 are able to identify which one of the power supply modules is attached to the printed circuit board in question.
- the interrupt circuit comprises a com- parator 19 comprising a first input connected to the inputs 15, 16 and 13 of the interrupt circuit through resistors R1 , R2 and R3.
- the level of the voltage signal U1 fed to the first input of the comparator 19 is thus also dependent on the control signal transmitted through the control input of the power supply, in other words on the type of the power supply (which is, in turn, dependent on the nominal voltage of the battery in use).
- the comparator 19 compares the voltage signal U1 fed to its first input with the reference voltage Uref fed to its second input.
- the comparator 19 In case the voltage level of the voltage signal U1 is lower than the reference voltage Uref, the comparator 19 generates an interrupt signal fed by the output 14 of the interrupt circuit to the interrupt input 9 of the power supply module.
- the appearance of an interrupt signal interrupts the operation of the power supply module 17 or similarly the operation of the power supply module 18, whereby the loading of the battery 5 or the battery 6 stops correspondingly.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI970337 | 1997-01-27 | ||
FI970337A FI970337A (en) | 1997-01-27 | 1997-01-27 | Printed circuit board arrangement |
PCT/FI1998/000069 WO1998036483A1 (en) | 1997-01-27 | 1998-01-26 | Circuit arrangement for preventing deep discharge of a battery |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0960458A1 true EP0960458A1 (en) | 1999-12-01 |
Family
ID=8547850
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98901985A Withdrawn EP0960458A1 (en) | 1997-01-27 | 1998-01-26 | Circuit arrangement for preventing deep discharge of a battery |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0960458A1 (en) |
CN (1) | CN1104769C (en) |
AU (1) | AU5864898A (en) |
FI (1) | FI970337A (en) |
WO (1) | WO1998036483A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2783979B1 (en) * | 1998-09-28 | 2000-11-10 | Cit Alcatel | PORTABLE ELECTRONIC DEVICE WITH BATTERY DISCHARGE CONTROL CIRCUIT, AND ASSOCIATED METHOD |
EP1938171B1 (en) | 2005-10-14 | 2017-01-04 | BlackBerry Limited | System and method for managing battery slump |
JP2010055394A (en) * | 2008-08-28 | 2010-03-11 | Sanyo Electric Co Ltd | Projection video display device |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2061642A (en) * | 1979-10-12 | 1981-05-13 | Contronic Controls | Back-up power supply |
US5742148A (en) * | 1992-11-24 | 1998-04-21 | Seiko Instruments Inc. | Charge/discharge control circuit and chargeable electric power source apparatus |
JP3272108B2 (en) * | 1993-07-07 | 2002-04-08 | 三洋電機株式会社 | Battery pack |
-
1997
- 1997-01-27 FI FI970337A patent/FI970337A/en unknown
-
1998
- 1998-01-26 EP EP98901985A patent/EP0960458A1/en not_active Withdrawn
- 1998-01-26 WO PCT/FI1998/000069 patent/WO1998036483A1/en active Application Filing
- 1998-01-26 CN CN 98802051 patent/CN1104769C/en not_active Expired - Fee Related
- 1998-01-26 AU AU58648/98A patent/AU5864898A/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO9836483A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN1244965A (en) | 2000-02-16 |
FI970337A (en) | 1998-07-28 |
CN1104769C (en) | 2003-04-02 |
WO1998036483A1 (en) | 1998-08-20 |
AU5864898A (en) | 1998-09-08 |
FI970337A0 (en) | 1997-01-27 |
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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: 19990723 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): BE DE FR GB IT SE |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: NOKIA NETWORKS OY |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: NOKIA CORPORATION |
|
17Q | First examination report despatched |
Effective date: 20071001 |
|
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
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: 20091216 |