WO1996041407A1 - Alimentation electrique pour appareils electriques mobiles - Google Patents

Alimentation electrique pour appareils electriques mobiles Download PDF

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Publication number
WO1996041407A1
WO1996041407A1 PCT/EP1995/002182 EP9502182W WO9641407A1 WO 1996041407 A1 WO1996041407 A1 WO 1996041407A1 EP 9502182 W EP9502182 W EP 9502182W WO 9641407 A1 WO9641407 A1 WO 9641407A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrical
voltage source
housing
switching device
switch
Prior art date
Application number
PCT/EP1995/002182
Other languages
German (de)
English (en)
Inventor
Heinz Baier
Ulrich Kuenzel
Original Assignee
International Business Machines Corporation
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 International Business Machines Corporation filed Critical International Business Machines Corporation
Priority to PCT/EP1995/002182 priority Critical patent/WO1996041407A1/fr
Priority to DE19618236A priority patent/DE19618236A1/de
Publication of WO1996041407A1 publication Critical patent/WO1996041407A1/fr

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

Definitions

  • the invention relates to an electrical circuit for an electrical direct voltage source accommodated in a housing, in particular a battery, an accumulator or the like.
  • Mobile electrical devices usually have a mains-independent voltage supply.
  • This is usually a DC voltage source, for example a battery or an accumulator.
  • a DC voltage source is often discharged relatively quickly through the operation of the electrical device.
  • the DC voltage source is usually designed in such a way that the user can quickly replace it with a fully charged DC voltage source. It has now been found that despite all circuit-related safety measures, short-circuits or other defects occur repeatedly in the electrical device, which ultimately lead to a short-circuit between the poles of the DC voltage source and thus to a high current flow through the electrical device. This can not only result in the destruction of components of the electrical device, but also the risk of scorching or the like.
  • one of the poles of the DC voltage source is led out of the housing via a switching device, the switching device being controllable from outside the housing. It can be the live pole as well as the ground pole of the DC voltage source. It is particularly expedient to lead the live pole of the DC voltage source out of the housing via the switching device.
  • the DC voltage source can be “switched off” with the aid of the switching device.
  • the DC voltage source is switched off, there is no longer any voltage at the poles that can be tapped from the outside of the housing. A short circuit between these poles is therefore not possible. Any damage that can result from such a short circuit is therefore excluded.
  • the DC voltage source is switched on, the full voltage of the DC voltage source is present between the poles that can be tapped off on the outside of the housing. The electrical device can then be operated with this voltage.
  • the user of the electrical device can thus switch the entire electrical device including the DC voltage source into an operationally safe state by switching off the DC voltage source, in which a short circuit within the device or at the poles of the DC voltage source that can be tapped off on the outside of the housing is not possible.
  • a short circuit is only conceivable within the housing; the probability of one Such a short circuit is extremely small, however, since the endangered poles are not accessible from the outside due to the encapsulation of the electrical circuit inside the housing.
  • the switching device can be controlled from outside the housing in various ways. So it is possible that a mechanical switch is provided which can be operated by the user. Another possibility is that the switching device can be electrically controlled via further connection points which can be tapped off on the housing. Furthermore, wireless controls of the switching device are also theoretically conceivable.
  • the electrical circuit according to the invention has the advantage that no voltage is applied to the poles of the DC voltage source that can be tapped off on the outside of the housing by the interposed switching device.
  • the live pole of the DC voltage source is led out of the housing via a resistor and on the other hand a control line connected to the switching device.
  • a control line connected to the switching device.
  • an on / off switch can be connected between the voltage-carrying pole led out via the resistor and the control line, which in the closed state controls the switching device in its likewise switched-on state. The result of this is that when the on / off switch is closed, a voltage is present at the poles of the DC voltage source that can be tapped off on the outside of the housing.
  • Said on / off switch can be arranged within the electrical device, in particular it can be the on / off switch of the electrical device.
  • the described development of the invention thus has the advantage that the switching device can be electrically controlled in its switched-on state. This electrical control can take place from the electrical device. If the DC voltage source is uncoupled from the electrical device, the switching device automatically changes to its open state, so that a short circuit at the poles of the DC voltage source that can be tapped off from the housing is not possible.
  • a relay, a thyristor or the like is provided as the switching device.
  • An electrical or electromechanical component is thus provided as the switching device.
  • a transistor is provided to control the switching device.
  • the current required to control the switching device is independent of the current required to actuate the switching device. If, for example, a relay is provided as the switching device, the current required for actuating the relay can be higher than that for controlling the relay required electricity. As a result, on the one hand, the current consumption when the switching device is switched off can be limited to a minimum, while on the other hand, the switching reliability of the relay can be increased to a maximum by a relatively high current when it is actuated.
  • the base of the transistor is connected to the control line led out of the housing, if the emitter of the transistor is connected to the ground pole of the DC voltage source, if the coil of the relay on the one hand with the collector of the transistor and on the other hand with the voltage-carrying pole of the DC voltage source is connected, and if a switch connected to the voltage-carrying pole of the DC voltage source can be switched on and off by means of the coil.
  • This circuit arrangement has proven to be particularly advantageous in practice. In particular, it has been found that this circuit has particularly expedient electrical properties with regard to power consumption, switching reliability, etc. when the switching device is switched on and also when it is switched off.
  • the electrical circuit according to the invention is used in a voltage supply unit of an electrical device.
  • the voltage supply unit has an electrical DC voltage source accommodated in a housing and the electrical circuit likewise housed in the housing.
  • the voltage supply unit can usually be coupled to the electrical device.
  • the voltage supply unit is usually in the form of a package can be plugged into the device.
  • This voltage supply unit according to the invention also has the advantages already described in connection with the electrical circuit according to the invention. In particular, a short circuit between the poles of the DC voltage source that can be tapped on the outside of the housing when the voltage supply unit is not plugged in is not possible.
  • the voltage supply unit according to the invention is used in an electrical device, preferably in a portable computer.
  • the voltage supply unit can be coupled to the electrical device and is therefore easy to replace.
  • the electrical device is reliably protected against short circuits and their consequences when the operating state is switched off.
  • an on / off switch which can be operated by the user is provided to control the switching device. It can expediently be the on / off switch of the electrical device.
  • the on / off switch of the electrical device.
  • the voltage supply unit is switched to the switched-on state as soon as, for example, the DC voltage source in the voltage supply unit is to be recharged via a mains connection and a corresponding charger.
  • a mains connection with an associated charger is provided in most mobile electrical devices.
  • the on / off switch which can be controlled by the device itself, the DC voltage source can be charged without the circuit according to the invention having to be changed in the voltage supply unit.
  • means are provided for measuring the current actually flowing into the device, for comparing the current with a desired value and for controlling the switching device as a function thereof.
  • these means it is possible to limit the current flowing when the electrical device is switched on to a maximum value. If this maximum value is exceeded, the switching device in the voltage supply unit is switched off. As a result, no more current flows. The electrical device is thus protected against excessive current flow.
  • the maximum permissible current flow can be changeable. It is thus possible, for example in the case of a portable computer, to set this maximum current flow as a function of the actually operated components of the computer.
  • the means by which According to the invention, the current limitation can be carried out expediently in the electrical device itself, but it is also possible for the means, at least in part, to be accommodated in the voltage supply unit, in particular as additional components of the circuit according to the invention.
  • FIG. 1 is a schematic block diagram of an electrical circuit for an electrical DC voltage source housed in a housing
  • Fig. 2 is a schematic block diagram of a
  • the 1 shows a voltage supply unit 1 which can be coupled to an electrical device 2.
  • the electrical device 2 is, for example, a portable computer.
  • the voltage supply unit 1 can be coupled to the electrical device 2, for example, with the aid of pins which can be inserted into assigned sockets.
  • a cavity or the like is provided in the electrical device 2, in which the voltage supply unit 1 is accommodated. The insertion or insertion of the voltage supply unit 1 into this cavity then mostly simultaneously causes the electrical connection between the voltage supply unit 1 and the electrical device 2, for example by inserting the pins into the assigned sockets.
  • the voltage supply unit 1 has a housing 3, in which a DC voltage source 4 and an electrical circuit 5 are accommodated.
  • a DC voltage source 4 and an electrical circuit 5 are accommodated.
  • the DC voltage source 4 can be a battery or an accumulator.
  • the DC voltage source 4 has a voltage-carrying pole 6 and a ground pole 7.
  • the ground pole 7 is connected to a minus connection point 8 which can be tapped off the outside of the housing 3.
  • the electrical circuit 5 has a relay 9 which contains a switch 10 and a coil 11 which controls the switch.
  • the switch 10 is connected on the one hand to the voltage-carrying pole 6 of the DC voltage source 4 and on the other hand to a positive connection point 12 which can be tapped from the outside of the housing.
  • the coil 11 is connected on the one hand to the live pole 6 of the DC voltage source 4 and on the other hand to the collector of an NPN transistor 13, whose emitter is connected to the ground pole 7 of the DC voltage source 4.
  • the base of the transistor 13 is connected to a first control connection point 14 which can be tapped on the outside of the housing 3 of the voltage supply unit 1. Furthermore, the voltage-carrying pole 6 is connected via a resistor 15 to a second control connection point 16, which can also be tapped on the outside of the housing 3.
  • the electrical device 2 has on its outside two connection points 17, 18, the minus connection point 8 and the plus connection point 12 of the
  • Power supply unit 1 are assigned.
  • the electrical device 2 can be supplied with the voltage required for operation via these connection points 17, 18.
  • the electrical device 2 has control connection points 19, 20 which are the control connection points 14, 16
  • Power supply unit 1 are assigned. Between the control connection points 19, 20 of the electrical device 2, an on / off switch 21 is connected, which can be operated by the user of the electrical device 2, and on the other hand, an on / off switch 22, which is controlled by the electrical device 2 itself can.
  • the on / off switch 21 which can be actuated by the user can be directly the on / off switch of the electrical device.
  • the on / off switch 22, which can itself be controlled by the electrical device 2, can be connected, for example, to a mains-dependent charging device for the DC voltage source 4.
  • connection points 8, 12 of the voltage supply unit 1 with the connection points 17, 18 of the electrical device 2 and
  • control connection points 14, 16 of the voltage supply unit 1 are connected to the control connection points 19, 20 of the electrical device 2, the electrical circuit 5 in the voltage supply unit 1 can be controlled via the on / off switches 21, 22.
  • the transistor 13 is also in its open and thus conductive state and the plus connection point 12 of the voltage supply unit 1 has no voltage.
  • the voltage supply unit 1 connected connection point 17 of the electrical device 2 is thus acted upon by the aforementioned voltage, so that the electrical device 2 can be operated.
  • the on / off switch 21 is actuated by the user, the voltage supply unit 1 has thus been “switched on” and thus also the electrical device 2.
  • the charging device which can be connected to the electrical device 2 is provided not only for charging the DC voltage source 4 of the voltage supply unit 1, but also for the voltage supply of the electrical device 2 itself.
  • the user can do this with the charging device plugged in Operate electrical device 2 simultaneously using the on / off switch 21.
  • the functions of the two on / off switches 21, 22 overlap. As long as one of the two on / off switches 21, 22 is in its closed state, the switch 10 is closed and thus the voltage-carrying pole 6 of the DC voltage source 4 is connected to the positive connection point 12 of the voltage supply unit 1. The electrical device can thus be operated and charged at the same time until both on / off switches 21, 22 are open again.
  • the switching device 23 can also consist of a thyristor, a power transistor or the like.
  • the electrical device 2 has an electrical circuit 25, which limits the current flowing into the electrical device 2.
  • the connection point 17 is connected to a current measuring device 26, in particular a shunt or the like, at the output 27 of which a signal is available which represents the current actually flowing into the electrical device 2.
  • This value is compared with a target value 29 using a comparison device 28.
  • the output of the comparison device 28 acts on a switch 30 which is connected between the control connection point 19 and the two on / off switches 21, 22.
  • the switch 30 remains in its idle state, that is to say in its closed state. This has the consequence that the switch 30 connected between the control connection point 19 and the two on / off switches 21, 22 has no effect, and the mode of operation described with reference to FIG. 1 is therefore given.
  • the switch 30 can be closed again after the current flow has been interrupted, so that the operation of the electrical device 2 can be continued.
  • time switches or the like to interrupt the flow of current via the switch 30 only when the current actually flowing into the electrical device 2 exceeds the predetermined target value for a certain period of time. In this way, current peaks and the like cannot lead to an immediate power cut-off.
  • the setpoint can be changed variably.
  • the setpoint can be adapted to the current power requirement of the electrical device.
  • the target value can be increased in a portable computer when, for example, the hard disk is active. Accordingly, it is possible to lower the setpoint if, for example, the screen is switched off. In this way, it is possible to specify a setpoint at any time, which represents the actual current requirement of the electrical device 2, so that exceeding the setpoint is a sure sign of a malfunction in any case and thus an interruption in the flow of electricity is justified.
  • the electrical circuit 25 shown in FIG. 2 is accommodated in the electrical device 2.
  • the comparison device 30 and, above all, the variable setpoint specification carried out directly by the processor of the portable computer.
  • the entire electrical circuit 25 or at least components thereof can be accommodated not in the electrical device 2 but in the voltage supply unit 1. This can then make further electrical connection between the voltage supply unit 1 and the electrical device 2 necessary.

Landscapes

  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

L'invention concerne un circuit électrique (5) destiné à une source de tension continue (4) renfermée dans un boîtier (3). On fait sortir du boîtier (3) le pôle sous tension (6) via un dispositif de commutation (23), qui peut être commandé depuis l'extérieur du boîtier (3). Cette commande peut, par exemple, s'effectuer en reliant le dispositif de commutation (3) à un interrupteur général (21,22) d'un appareil électrique (2). Si l'utilisateur, par exemple, ferme l'interrupteur général (21,22), le dispositif de commutation électrique (23) passe aussi à l'état fermé de façon que la tension délivrée par la source de tension continue (4) puisse être prélevée à l'extérieur du boîtier (3). Si en revanche, l'interrupteur général (21,22) se trouve à l'état ouvert, aucune tension n'est alors appliquée aux points de connexion (8,12) situés à l'extérieur du boîtier (3). Cela présente l'avantage qu'aucun court-circuit ne peut se produire entre ces points de connexion (8,12).
PCT/EP1995/002182 1995-06-07 1995-06-07 Alimentation electrique pour appareils electriques mobiles WO1996041407A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/EP1995/002182 WO1996041407A1 (fr) 1995-06-07 1995-06-07 Alimentation electrique pour appareils electriques mobiles
DE19618236A DE19618236A1 (de) 1995-06-07 1996-05-07 Spannungsversorgung für mobile elektrische Geräte

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP1995/002182 WO1996041407A1 (fr) 1995-06-07 1995-06-07 Alimentation electrique pour appareils electriques mobiles

Publications (1)

Publication Number Publication Date
WO1996041407A1 true WO1996041407A1 (fr) 1996-12-19

Family

ID=8166034

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1995/002182 WO1996041407A1 (fr) 1995-06-07 1995-06-07 Alimentation electrique pour appareils electriques mobiles

Country Status (2)

Country Link
DE (1) DE19618236A1 (fr)
WO (1) WO1996041407A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3380766B2 (ja) 1999-03-18 2003-02-24 富士通株式会社 保護方法及び制御回路並びに電池ユニット
DE19930402B9 (de) * 1999-07-02 2012-01-05 Horcher Gmbh Stromversorgungseinrichtung mit einem Akkumulator zur Speisung eines elektrischen Antriebs eines Lastträgers für Personen
DE10206485B4 (de) * 2002-02-16 2007-06-21 Robert Bosch Gmbh Stromversorgungseinrichtung und Elektrogerät
SE540673C2 (en) * 2016-03-08 2018-10-09 Radinn Ab Battery unit with safety arrangement, wakejet and method for powering a vehicle

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2402330A1 (fr) * 1977-09-02 1979-03-30 Auergesellschaft Gmbh Bloc d'alimentation pour appareils de mesure
DE3417481A1 (de) * 1984-05-11 1985-11-14 Manfred 8950 Kaufbeuren Trautmann Schutzschaltung fuer einen akkumulator
US4820965A (en) * 1987-03-23 1989-04-11 Maurice A. Sween Control circuit for battery charger
DE9212558U1 (de) * 1991-09-18 1992-11-19 Samsung Electronics Co., Ltd., Kyonggi Batterieschutzschaltkreis
EP0514072A2 (fr) * 1991-05-16 1992-11-19 Kabushiki Kaisha TEC Appareil de fac-similé
DE9319881U1 (de) * 1993-12-23 1994-08-04 Hugo Junkers Werke GmbH, 82216 Maisach Mobile Energieversorgungseinheit
US5343137A (en) * 1992-01-28 1994-08-30 Sanyo Electric Co., Ltd. Apparatus to prevent complete battery discharge
GB2279802A (en) * 1993-07-07 1995-01-11 Sanyo Electric Co Battery pack with short circuit protection provided by semiconductor switching device
EP0644642A2 (fr) * 1993-07-30 1995-03-22 Texas Instruments Incorporated Alimentation électrique

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2402330A1 (fr) * 1977-09-02 1979-03-30 Auergesellschaft Gmbh Bloc d'alimentation pour appareils de mesure
DE3417481A1 (de) * 1984-05-11 1985-11-14 Manfred 8950 Kaufbeuren Trautmann Schutzschaltung fuer einen akkumulator
US4820965A (en) * 1987-03-23 1989-04-11 Maurice A. Sween Control circuit for battery charger
EP0514072A2 (fr) * 1991-05-16 1992-11-19 Kabushiki Kaisha TEC Appareil de fac-similé
DE9212558U1 (de) * 1991-09-18 1992-11-19 Samsung Electronics Co., Ltd., Kyonggi Batterieschutzschaltkreis
US5343137A (en) * 1992-01-28 1994-08-30 Sanyo Electric Co., Ltd. Apparatus to prevent complete battery discharge
GB2279802A (en) * 1993-07-07 1995-01-11 Sanyo Electric Co Battery pack with short circuit protection provided by semiconductor switching device
EP0644642A2 (fr) * 1993-07-30 1995-03-22 Texas Instruments Incorporated Alimentation électrique
DE9319881U1 (de) * 1993-12-23 1994-08-04 Hugo Junkers Werke GmbH, 82216 Maisach Mobile Energieversorgungseinheit

Also Published As

Publication number Publication date
DE19618236A1 (de) 1996-12-12

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