WO2005029671A1 - Circuit electronique pour l'alimentation en tension d'un consommateur electronique - Google Patents

Circuit electronique pour l'alimentation en tension d'un consommateur electronique Download PDF

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Publication number
WO2005029671A1
WO2005029671A1 PCT/DE2004/002032 DE2004002032W WO2005029671A1 WO 2005029671 A1 WO2005029671 A1 WO 2005029671A1 DE 2004002032 W DE2004002032 W DE 2004002032W WO 2005029671 A1 WO2005029671 A1 WO 2005029671A1
Authority
WO
WIPO (PCT)
Prior art keywords
voltage source
current
diode
electronic circuit
voltage
Prior art date
Application number
PCT/DE2004/002032
Other languages
German (de)
English (en)
Inventor
Werner Bumen
Christian Gern
Gerhard Haaga
Original Assignee
Robert Bosch Gmbh
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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2005029671A1 publication Critical patent/WO2005029671A1/fr

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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
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • 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
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources

Definitions

  • the invention relates to an electronic circuit for providing a supply voltage for an electronic consumer, in particular a current measuring circuit of a current clamp.
  • the invention relates to a current clamp with such an electronic circuit.
  • Current clamp meters are basically known in the prior art. They are used to detect, in particular, the size or the amount of a current flowing through an electrical conductor. For this purpose, they typically comprise a current measuring circuit with a Hall element for detecting a magnet lde induced by the current flowing through the conductor, the strength of which is proportional to the strength of the flowing current sought.
  • the electronic circuit according to the invention is characterized by an internal voltage source for providing an internal voltage; a series circuit connected in parallel with the internal voltage source, comprising at least a first diode, an impedance device connected at one end to the cathode of the first diode, and a first electrical connection for connecting the other end of the impedance device to the negative pole of the internal voltage source; a second electrical connection between the positive pole of an optionally connectable external voltage source and the cathode of the first diode, the external voltage provided by the external voltage source between its positive pole and negative pole being greater than the internal voltage plus the forward voltage of the first diode; and a third electrical connection between the negative pole of the external voltage source and the first electrical connection, the supply voltage for the consumer being available for tapping via the impedance device.
  • the claimed electronic circuit advantageously automatically recognizes whether the external voltage is present or not. If he determines that the external voltage is present, then he uses only this and not the existing internal voltage source to provide the supply voltage for the consumer. On the other hand, if it detects that no external voltage source is connected to it, it generates the Supply voltage for the consumer from the internal voltage. The claimed electronic circuit simultaneously ensures that the external and internal voltage sources are decoupled from one another and do not influence one another when both voltage sources are connected.
  • the series circuit has an electronic switching device. This enables at
  • the claimed electronic circuit can either be for connecting a two-pole external voltage source with plus and minus potential or for connecting a three-pole external
  • Voltage source must be designed with plus, gauze and minus potential. If the electronic circuit is designed to connect a two-pole external voltage source, it is advantageous if its second and / or third electrical connection is designed as a protective diode to prevent current flow from the cathode of the first diode to the positive pole of the external voltage source. There is a risk that such a current flow will occur in particular if, for example, an external voltage is accidentally connected to the electronic circuit which is less than the internal voltage plus the forward voltage of the first diode.
  • FIG. 1 shows a first exemplary embodiment of the electronic circuit according to the invention
  • FIG. 2 shows a second exemplary embodiment of the electronic circuit according to the invention
  • FIG. 3 shows a third exemplary embodiment of the electronic circuit according to the invention
  • Figure 4 is a current clamp according to the invention.
  • Figure 5 shows a fourth exemplary embodiment of the electronic circuit according to the invention.
  • FIG. 1 shows a first exemplary embodiment of the electronic circuit 100 according to the invention. This is used to provide a supply voltage V +, 0V for an electronic consumer 200.
  • the electronic circuit 100 has an internal voltage source 120 to provide an internal equilibrium voltage 0 5c
  • the internal voltage source 120 is typically a battery or a ⁇ k '- ⁇ um ⁇ lator.
  • a series circuit is connected in parallel with the internal voltage source 120, which in the first exemplary embodiment shown in FIG. 1 shows a first diode Di, an impedance device m-shaped with one end connected to the cathode of the first diode D1, in the form of the resistor R1, and a first electrical connection L1 to connect the other end of the impedance device R1 with the
  • the first electrical connection L1 is designed as a normal electrical line.
  • the plus pole + Vex of an external voltage source (not shown here) is connected to the cathode of the first diode D1 via a second electrical connection L2.
  • a third electrical connection L3 connects the mirror pole OVe ⁇ of the external voltage source to the first electrical connection L1 and to the other end of the impedance device R1.
  • the supply voltage V 4 -, 0V can then be tapped via the impedance device R1.
  • Diode Dl is then switched in the forward direction and the supply voltage is tapped via the impedance Rl. Such operation is also referred to below as battery operation.
  • an external voltage source with the positive pole + Vex and the negative pole OV is connected to the electronic circuit 100 via the second and third connections L2, L3, as shown in FIG. 1, and the voltage provided by the external voltage source is greater than the internal voltage U 3a t plus the forward voltage of the first diode D1, this connection is automatically recognized by the electronic circuit and it provides the supply voltage V +, 0V for the consumer 200 from this external voltage.
  • the diode D1 serves as a detection element. In the case described last, it prevents a negative current from flowing through the internal voltage source 120 and the latter being discharged. Due to the diode Dl, the internal voltage source 120 and the external
  • the voltage source although connected to the electronic circuit at the same time, is decoupled from one another, so that they would not have a negative effect, for example, in the form of a discharge of the internal voltage source 120.
  • FIG. 2 shows a second exemplary embodiment of the electronic circuit shown in FIG. 1.
  • the same components are provided with the same reference symbols; the way it works is basically the same.
  • a electronic switching device S is provided between the positive pole of the internal voltage source 120 and the anode of the first diode D1. This switching device enables in
  • the second and / or the third electrical connection L2, L3 is advantageously designed as a protective diode Ds.
  • the second electrical connection L2 is designed as a protective diode Ds
  • the anode of this diode Ds must be connected to the positive pole + Vex of the external voltage source.
  • the third electrical connection L3 is designed as a protective diode, not shown in FIG. 2, the cathode of these protective diodes must be connected to the negative pole of the external voltage source.
  • the consumer 200 needs a three-pole
  • Supply voltage comprising a plus potential V +, 0V and V-, the still missing negative potential V- of the supply voltage for the consumer can be generated by providing a switching element 130 connected in parallel with the resistor R1.
  • the impedance device in the embodiment shown in Figure 3 is designed as a series connection of two resistors R1 and R2, and at the same time the first electrical connection L1 is in the form of a second diode D2, which has its cathode connected to the negative pole of the internal voltage source 120.
  • the third connection L3 now connects the negative pole -Vex, that is the negative pole of the external voltage source to the anode of the diode D2, and the entire supply voltage between the positive pole V + and the negative pole V- is now connected in series via Rl and R2 tapped A center tap M between the preferably equally sized W.
  • the resistors R1 and R2 are used via a driver device 140 connected to them to provide a zero potential OV for the three-pole symmetrical supply voltage.
  • This gauze potential is connected to the zero potential of the external voltage source and then overall represents the zero potential of the electronic circuit.
  • a lamp 150 is advantageously connected in parallel with the impedance devices R1 and R2, which basically lights up when the electronic circuit is in operation; this applies regardless of whether the supply voltage V +, 0V, V- from the internal
  • FIG. 4 shows a preferred application for the electronic circuit 100 according to the invention in the form of a current clamp 300.
  • This is used to measure an electrical current flowing through an electrical conductor 400.
  • This flowing current induces a magnetic field in the measuring clamp 300, which is detected by a Hall element and evaluated by a current measuring circuit. The registered in 'this way, the magnetic field strength is a measure of the strength of the current flowing through the conductor 400 electric current.
  • Said current measuring circuit is a consumer 200 in the sense of the present invention. If only a positive or only a negative current is to be measured with this current measuring circuit, it is sufficient if the current measuring circuit is only supplied with a two-pole supply voltage V +, 0V or 0V, V-.
  • the current measuring circuit requires a symmetrical supply voltage V +, 0V, V-.
  • the current measuring circuit 200 generates an output measuring voltage U üu t, as is indicated in FIG. 1, which represents the amount of the current flowing through the conductor 400.
  • the current clamp meter 300 includes the electronic circuit 100 according to the invention a cable 310 and a six-pin connector 320, via which it can be connected to an external voltage source.
  • the six-pole connector plug 320 comprises two pins for outputting the measurement signal U u - and a coding pin which outputs an information signal with which measurement unit the measurement signal is to be interpreted.
  • the latter depends on the type of clamp meter used depending on whether it is designed for the detection of currents up to 20 A or for the detection of currents up to 1000 A.
  • an adapter 322 which can be plugged onto the six-pole plug 320 is provided for this purpose, which in addition to the two pins for the
  • Measuring signal U 0u t isolates all other pins of the six-pole plug and only provides the two pins for outputting the measuring signal via two banana plugs 32 for insertion into the multimeter or handheld device.
  • Figure 5 shows a fourth embodiment of the electronic circuit according to the invention. It aims at the problem of a gauze adjustment of the measurement signal U 0u t provided by the current clamp 300.
  • the current clamp 300 typically has an internal device 310 for realizing a zero adjustment of the measurement signal U 0u t in order to have effects internal to the current clamp, such as temperature - or to prevent aging effects which cause an undesirable voltage offset in the measurement signal Uo u t which is superimposed on the measurement signal and falsifies it.
  • Such an undesired offset voltage arises when a current flows through this cable 310, as a result of which a voltage drop in the form of the undesired offset drops across this cable 310.
  • this offset can be a few millivolts.
  • FIG. 5 shows a solution of how this undesirable voltage drop across the cable 310 can be avoided.
  • the fourth embodiment is essentially based on the first embodiment shown in FIG. 1; Identical electronic components are identified by the same reference symbols.
  • FIG. 5 clearly illustrates the operation of the current clamp meter via the external voltage source (not shown) with the potentials + Vext, -Vext, preferably built into a motor test device 500.
  • the motor test device 400 receives the measured current I representing output voltage Uou in order to process it electronically and. display to a user. It can be seen that this output voltage U 0u t is measured against the mass of the current clamp , that is to say against the potential of the neutral conductor L3.
  • the supply voltage + Vex, 0V provided by the external voltage source would result in a current flow l h -2, I 3 through the Effect conductor L2 via current measuring circuit 200 and conductor L3, 310 back into the external voltage source or motor test device 500.
  • This supply current I b3 would, however, on the long usually several meters connection line L3, 310 several between the current measurement circuit 200 to the taps for the output voltage Uout and the measurement input AB of the engine test apparatus 500 has a not insignificant voltage drop of typically Effect millivolts.
  • the symmetry resistor R sym is to be dimensioned such that it represents the total resistance as it results without taking the symmetry resistance into account when moving from the external voltage source into the. the connected circuit is looked into.
  • the balancing resistor R-sm would have to be dimensioned such that it represents the parallel connection from the resistor Rl and the impedance of the current measuring circuit 200.
  • the circuit arrangement shown in FIG. 5 then ensures that the same amount of current flows via the external feed lines L2 and L4 and that none flows via the gauze conductor L3, 310 Supply current flows. No undesired offset voltage can then drop across the conductor L3.
  • the diode D1 can also be implemented electronically, for example with the aid of a field effect transistor.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Electrical Variables (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

L'invention concerne un circuit électronique pour l'alimentation en tension d'un consommateur électronique. L'objectif de cette invention est de permettre la production de cette tension d'alimentation aussi bien à partir d'une tension externe (Vex), appliquée au circuit électronique, que d'une source de tension interne (120), présente dans le circuit électronique. A cet effet, ladite invention présente un montage en série, monté en parallèle avec la source de tension interne, comportant une diode (D1) et un dispositif à impédance (R1) dont une extrémité est connectée à la cathode de la première diode (D1). Le pôle positif (+Vex) de la source de tension externe est raccordé à la cathode de la première diode (D1) et le pôle négatif (0V) de la source de tension externe est raccordé au pôle négatif de la source de tension interne. La tension d'alimentation est ensuite prélevée par l'intermédiaire du dispositif à impédance et produite à partir de la source de tension externe, lorsque la tension externe est supérieure à la tension interne, produite par la source de tension interne, plus la tension à l'état passant de la première diode.
PCT/DE2004/002032 2003-09-16 2004-09-09 Circuit electronique pour l'alimentation en tension d'un consommateur electronique WO2005029671A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10342719.8 2003-09-16
DE2003142719 DE10342719A1 (de) 2003-09-16 2003-09-16 Elektronischer Schaltkreis zum Bereitstellen einer Versorgungsspannung für einen elektronischen Verbraucher

Publications (1)

Publication Number Publication Date
WO2005029671A1 true WO2005029671A1 (fr) 2005-03-31

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PCT/DE2004/002032 WO2005029671A1 (fr) 2003-09-16 2004-09-09 Circuit electronique pour l'alimentation en tension d'un consommateur electronique

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DE (1) DE10342719A1 (fr)
WO (1) WO2005029671A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104412113A (zh) * 2012-04-25 2015-03-11 施耐德电气It公司 电流监测装置
US9638726B2 (en) 2012-04-12 2017-05-02 Schneider Electric It Corporation System and method for detecting branch circuit current
US9851382B2 (en) 2012-12-27 2017-12-26 Schneider Electric USA, Inc. Power meter with current and phase sensor
US9973036B2 (en) 2013-12-31 2018-05-15 Schneider Electric It Corporation Automatic sub-millisecond clock synchronization

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3267288A (en) * 1964-10-20 1966-08-16 Newmark Products Inc System for floating a battery on a load line
US4672293A (en) * 1985-08-26 1987-06-09 Crampton Timothy P Power-supply/battery back-up power supply/battery charger combination
US4704575A (en) * 1985-06-28 1987-11-03 Societe Chauvin Arnoux Hall-effect current clamp
EP0535408A2 (fr) * 1991-10-01 1993-04-07 Robert Bosch Gmbh Dispositif de détection de champ magnétique
JPH1071078A (ja) * 1997-08-07 1998-03-17 Matsushita Electric Ind Co Ltd 液晶表示装置の電源回路
US5793123A (en) * 1994-06-28 1998-08-11 Thomson Multimedia S.A. Electronic device with two power supply modes
US6088638A (en) * 1997-08-09 2000-07-11 Continental Ag Safety system for an electrical system

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3267288A (en) * 1964-10-20 1966-08-16 Newmark Products Inc System for floating a battery on a load line
US4704575A (en) * 1985-06-28 1987-11-03 Societe Chauvin Arnoux Hall-effect current clamp
US4672293A (en) * 1985-08-26 1987-06-09 Crampton Timothy P Power-supply/battery back-up power supply/battery charger combination
EP0535408A2 (fr) * 1991-10-01 1993-04-07 Robert Bosch Gmbh Dispositif de détection de champ magnétique
US5793123A (en) * 1994-06-28 1998-08-11 Thomson Multimedia S.A. Electronic device with two power supply modes
JPH1071078A (ja) * 1997-08-07 1998-03-17 Matsushita Electric Ind Co Ltd 液晶表示装置の電源回路
US6088638A (en) * 1997-08-09 2000-07-11 Continental Ag Safety system for an electrical system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 08 30 June 1998 (1998-06-30) *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9638726B2 (en) 2012-04-12 2017-05-02 Schneider Electric It Corporation System and method for detecting branch circuit current
CN104412113A (zh) * 2012-04-25 2015-03-11 施耐德电气It公司 电流监测装置
EP2841954A4 (fr) * 2012-04-25 2015-12-09 Schneider Electric It Corp Dispositif de surveillance du courant
AU2012378295B2 (en) * 2012-04-25 2017-04-13 Schneider Electric It Corporation Current monitoring device
US9804201B2 (en) 2012-04-25 2017-10-31 Schneider Electric It Corporation Current monitoring device
US9851382B2 (en) 2012-12-27 2017-12-26 Schneider Electric USA, Inc. Power meter with current and phase sensor
US9973036B2 (en) 2013-12-31 2018-05-15 Schneider Electric It Corporation Automatic sub-millisecond clock synchronization

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