WO1998020611A1 - Circuit d'alimentation en courant - Google Patents

Circuit d'alimentation en courant Download PDF

Info

Publication number
WO1998020611A1
WO1998020611A1 PCT/EP1997/006028 EP9706028W WO9820611A1 WO 1998020611 A1 WO1998020611 A1 WO 1998020611A1 EP 9706028 W EP9706028 W EP 9706028W WO 9820611 A1 WO9820611 A1 WO 9820611A1
Authority
WO
WIPO (PCT)
Prior art keywords
circuit
transistor
power supply
sensor circuit
sensor
Prior art date
Application number
PCT/EP1997/006028
Other languages
German (de)
English (en)
Inventor
Günther Bergk
Hartmut Loth-Krausser
Original Assignee
Braun Aktiengesellschaft
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 Braun Aktiengesellschaft filed Critical Braun Aktiengesellschaft
Publication of WO1998020611A1 publication Critical patent/WO1998020611A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • 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
    • H02H7/10—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 converters; for rectifiers
    • H02H7/12—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 converters; for rectifiers for static converters or rectifiers
    • H02H7/1213—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 converters; for rectifiers for static converters or rectifiers for DC-DC converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/338—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in a self-oscillating arrangement
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
    • H03K17/081—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit
    • H03K17/0812—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit by measures taken in the control circuit
    • H03K17/08126—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit by measures taken in the control circuit in bipolar transitor switches

Definitions

  • the invention relates to a power supply circuit that can be operated on a DC or AC voltage network, in particular an electronic switching power supply.
  • Such a power supply circuit namely a primary clocked flyback converter
  • a primary clocked flyback converter is known from DE 36 1 8 221 C2, which is operated with a supply voltage obtained from a direct or alternating voltage network via a rectifier bridge circuit.
  • This flyback converter contains a first transistor 1, the collector-emitter path of which is connected in series with a primary coil 51 acting as a load of a transformer and an emitter resistor 21 to the supply voltage U g .
  • This switching power supply also contains a drive transistor 2, with which the current flow through the first transistor 1 and the load can be controlled.
  • the first transistor 1 In order to be able to comply with the currently applicable regulations, such circuits must be designed in such a way that they can withstand voltage peaks of approx. In the known circuit briefly described above, this means that, above all, the first transistor 1 must have a sufficiently high overvoltage resistance. However, this surge resistance is dependent on the potential difference between the base and the emitter of the transistor. If the base and the emitter are connected to each other with a sufficiently low resistance, the dielectric strength of the collector-emitter path is much higher than with an open base. The maximum dielectric strength is achieved not only when the base and the emitter are short-circuited, but also when the base is at a lower potential than the emitter.
  • This object is achieved according to the invention by means of a sensor circuit which detects voltage peaks on the supply voltage generated, for example, by interference pulses and brings the endangered transistor into its state of maximum dielectric strength by means of a control circuit.
  • the sensor circuit in a first embodiment, it consists of a capacitor which is connected with its one connection to a pole of the supply voltage source and with its other connection to the control input of the control circuit. This sensor circuit reacts to the steep voltage rise caused by an interference pulse, which is transmitted without delay to the control circuit. The base circuit of the endangered first transistor is then terminated with a low impedance by means of the control circuit.
  • the sensor circuit only delivers a signal to the control circuit when the size of a voltage peak exceeds a certain threshold value.
  • the sensor circuit then consists, for example, of a series connection of a resistor with a varistor or a Zener or Transil diode, one end of the sensor circuit being connected to one pole of the supply voltage source and the other end of the sensor circuit being connected to the control input of the drive circuit is.
  • the sensor circuit can also consist of a series connection of a resistor with the switching path of a third transistor, the control input of the third transistor being connected to the same end of the sensor circuit as the switching path of the third transistor.
  • the sensor circuit can consist of a series connection of two resistors, i.e. a voltage divider, where the connection point of the two resistors is connected to the control input of the drive circuit, but the reference potential of the voltage divider does not necessarily have to be identical to the reference potential of the drive circuit.
  • Fig. 1 shows schematically a power supply circuit according to the invention
  • FIG. 2 shows an embodiment for the control circuit shown schematically in FIG. 1;
  • FIG. 3 shows a sensor circuit consisting of a capacitor
  • FIG. 4 shows a sensor circuit consisting of a series circuit comprising a resistor and a Zener diode
  • FIG. 5 shows a sensor circuit consisting of a series circuit consisting of a resistor and a transil diode
  • FIG. 6 shows a sensor circuit consisting of a series circuit comprising a resistor and a varistor
  • FIG. 7 shows a sensor circuit consisting of a series circuit comprising a resistor and a bipolar transistor
  • FIG. 8 shows a sensor switching circuit consisting of a series circuit comprising a resistor and a MOS transistor
  • Figure 1 0 shows an example of a first power supply circuit according to the invention.
  • Fig. 1 1 shows an example of a second power supply circuit according to the invention.
  • the power supply circuit also contains a sensor circuit 33 and a control Circuit 40.
  • a terminal 3 of the sensor circuit, a terminal 6 of the control circuit 40 and the emitter of the transistor 10 are connected to one pole of the supply voltage source.
  • a terminal 1 of the sensor circuit is connected to the other pole of the supply voltage source and one end of the load 20.
  • the sensor circuit 33 also has an output connection 2, which is connected to a control input 4 of the control circuit 40.
  • the drive circuit 40 has an output terminal 5 which is connected to the base of the transistor 10. In another embodiment, the sensor circuit has only the connections 1 and 2. In FIGS.
  • connection of the sensor circuit 33 and the control circuit 40 are each provided with the reference symbols mentioned above, so that it can be seen in a self-explanatory manner how the circuit parts shown in Figures 2 to 9 are interconnected to the power supply circuit shown only schematically in Fig. 1.
  • control circuit 40 shows only one transistor as part of the control circuit 40 which is relevant to the invention, the control input 4 of the control circuit 40 being connected to the base of the transistor and the output terminal 5 of the control circuit 40 being connected to the collector of the transistor.
  • the emitter of the transistor is connected to terminal 6 of the drive circuit.
  • connection 1 is connected to one pole of the supply voltage source and connection 2 is connected to control input 4 of control circuit 40.
  • the sensor circuit shown in FIG. 9 consists of a voltage divider with a first resistor R1 and a second resistor R2, which are connected in series between the connections 1 and 3 of the sensor circuit.
  • the output terminal 2 of the sensor circuit is connected to the connection point of the two resistors R1, R2.
  • the connection 3 of the sensor circuit is not at the same potential as the connection 6 of the control circuit 40.
  • the sensor circuits according to FIGS. 4 to 8 each have a series connection of a current limiting resistor R and a voltage 4, a Zener diode in Fig. 5, a Transil diode in Fig. 5, a varistor in Fig. 6, a bipolar transistor in Fig. 7 and a MOS transistor in Fig. 8 Transistor is.
  • connection 1 of the sensor circuits is connected to one end of the current limiting resistor R, and connection 2 of the sensor circuit to the further component.
  • the base of the bipolar transistor is connected to the emitter and terminal 2 of the sensor circuit; 8 analog gate and source are connected to terminal 2.
  • the numbering of the connections of the sensor circuits shown in FIGS. 3 to 9 is to be understood so that in other embodiments for sensor circuits according to the invention, the sensor circuits shown in FIGS. 3 to 8 can replace the first resistor R1 shown in FIG. 9.
  • the power supply circuit according to the invention shown in FIG. 10 differs from the circuit known from DE 36 18 221 C2 only by adding the sensor circuit 33 ′ according to FIG. 4.
  • the switching power supply shown in Fig. 1 0 thus has a primary clocked flyback converter with a transformer and a first transistor 1 and a diode 31 provided in the load circuit, which is polarized so that the energy stored in the blocking time of the first transistor 1 in the transformer the consumer, which in this case consists of an accumulator 61 and a DC motor 62 which can be switched to the accumulator 61 via a switch 63, is discharged. If the consumer is only a DC motor without an accumulator, a capacitor must be connected in parallel to the motor to smooth the output voltage.
  • the flyback converter is fed via a rectifier bridge circuit and a resistor 28 from a DC or AC voltage network, the voltage of which varies between 100 and 250 volts, but in extreme cases also 1 2 volts, and the frequency of which can be almost arbitrary in the case of a feeding AC voltage network can.
  • the rectified output voltage is applied via a series choke 8 and a transverse capacitor 9 to the input of the flyback converter or the control and regulating electronics.
  • the rectified voltage U g is due to the series connection of the primary winding 51 of the transformer, the collector-emitter path of the first transistor 1 and the first resistor 21.
  • the base of the first transistor 1 is both via the series circuit a resistor 26 and a capacitor 1 2 connected to the one terminal of the secondary winding 52 of the transformer and also via a resistor 25 to the positive potential of the rectified voltage U g .
  • the base of the first transistor 1 is connected to ground or reference potential via the collector-emitter path of a second transistor 2.
  • the emitter of the first transistor is connected to ground or reference potential via the first resistor 21.
  • the connection denoted by B between the emitter of the first transistor 1 and the first resistor 21 is via the parallel connection of a capacitor 11 with a second resistor 22 and a further resistor 23 connected in series at the positive pole of the input voltage source.
  • the connection point of the resistor 23 with the parallel connection of the capacitor 11 and the second resistor 22 is denoted by A and is connected to the base of the second transistor 2 via a zener diode 30.
  • the base of the second transistor 2 is connected to reference potential via a resistor 24.
  • the Zener diode 30 allows a more defined definition of the switching threshold of the second transistor 2. If the Zener diode 30 is omitted, i. H.
  • the resistor 24 can also be omitted.
  • the value of the resistor 21 is then, with otherwise the same dimensioning, correspondingly smaller.
  • the winding direction of the primary and secondary windings 51 and 52 of the transformer is determined by the points entered.
  • the circuit can also be constructed such that in addition to the secondary current flowing through the secondary winding, the secondary current flowing through the primary winding also flows through the accumulator.
  • the accumulator 61 is then connected between the resistor 21 and reference potential and the one end of the secondary winding 52 is guided to the connection point between the accumulator 61 and the resistor 21.
  • the preferred power supply circuit according to the invention is shown in Fig. 1 1. It differs from the circuit known from DE 36 1 8 221 C2 only by adding the sensor circuit 33 "according to FIG. 3, ie a capacitor is connected in parallel to the resistor 23.
  • the known circuit which already contains a control circuit in the form of the control transistor 2 is modified by adding a sensor circuit according to the invention and a further control circuit which also controls the first transistor 1, that is to say the base in the event of an interference pulse of the first transistor regardless of the current operating state of the power supply circuit pulls to a correspondingly low potential.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Direct Current Feeding And Distribution (AREA)
  • Dc-Dc Converters (AREA)

Abstract

L'invention concerne un circuit d'alimentation en courant pouvant être exploité dans un réseau à tension continue ou alternative. Une tension d'alimentation prélevée sur le réseau est appliquée à un circuit en série composé de la section collecteur-émetteur d'un premier transistor (1) et d'une charge (20). Le circuit d'alimentation comprend également un circuit de commande (40) destiné à la commande du premier transistor (1) pour commander le flux de courant traversant la charge (20), ainsi qu'un circuit de détection (33) qui, relié à une entrée de commande du circuit de commande (40), permet la détection des pointes de tension superposées à la tension d'alimentation. Le circuit de commande (40) applique à la base du premier transistor (1) un potentiel comparable au potentiel de l'émetteur du premier transistor, sur la base d'un signal émis par le circuit de détection (33).
PCT/EP1997/006028 1996-11-07 1997-10-31 Circuit d'alimentation en courant WO1998020611A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1996145783 DE19645783A1 (de) 1996-11-07 1996-11-07 Stromversorgungsschaltung
DE19645783.1 1996-11-07

Publications (1)

Publication Number Publication Date
WO1998020611A1 true WO1998020611A1 (fr) 1998-05-14

Family

ID=7810835

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1997/006028 WO1998020611A1 (fr) 1996-11-07 1997-10-31 Circuit d'alimentation en courant

Country Status (2)

Country Link
DE (1) DE19645783A1 (fr)
WO (1) WO1998020611A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2958469B1 (fr) * 2010-04-02 2015-01-02 Thales Sa Protection d'un equipement electronique.

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3402222A1 (de) * 1984-01-24 1985-07-25 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Schaltungsanordnung zum begrenzen von ueberspannungen
WO1992003646A1 (fr) * 1990-08-18 1992-03-05 Robert Bosch Gmbh Procede et dispositif d'excitation d'un consommateur electomagnetique
DE3618221C1 (de) * 1986-05-30 1993-02-11 Braun Ag Schaltnetzteil mit einem primaer getakteten Gleichspannungswandler

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3571608A (en) * 1969-04-04 1971-03-23 Honeywell Inc Protective circuit
DE3425235C1 (de) * 1984-07-14 1992-03-12 bso Steuerungstechnik GmbH, 6603 Sulzbach Schaltungsanordnung zum Schutze elektronischer Schaltungen gegen Überspannung
DE3526177A1 (de) * 1985-07-23 1987-02-05 Bosch Gmbh Robert Rberspannungs-schutzschaltung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3402222A1 (de) * 1984-01-24 1985-07-25 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Schaltungsanordnung zum begrenzen von ueberspannungen
DE3618221C1 (de) * 1986-05-30 1993-02-11 Braun Ag Schaltnetzteil mit einem primaer getakteten Gleichspannungswandler
WO1992003646A1 (fr) * 1990-08-18 1992-03-05 Robert Bosch Gmbh Procede et dispositif d'excitation d'un consommateur electomagnetique

Also Published As

Publication number Publication date
DE19645783A1 (de) 1998-05-20

Similar Documents

Publication Publication Date Title
DE19710319B4 (de) Schaltung zum Sperren einer Halbleiterschaltvorrichtung bei Überstrom
DE68913277T2 (de) Schutz für Leistungswandler gegen Spannungsspitzen.
DE2832595C2 (fr)
DE3907410C1 (fr)
DE2232625C3 (de) Geregelter Gleichspannungswandler
DE3618221C1 (de) Schaltnetzteil mit einem primaer getakteten Gleichspannungswandler
DE1541891A1 (de) Schaltungsanordnung zur Daempfung ferroresonanter Schwingungen
EP0287166B1 (fr) Circuit de limitation des pointes de courant pour un transistor de commutation
DE102005001322B4 (de) Verfahren und Schaltung zur galvanisch getrennten Übertragung eines Signals
EP0255067A1 (fr) Circuit limiteur de courant
EP2110950A1 (fr) Circuit et procédé de transmission de tension de signal à l'intérieur d'un pilote d'un circuit semi-conducteur de puissance
EP0509343B1 (fr) Méthode de fonctionnement d'un régulateur à découpage et son dispositif
WO1998020611A1 (fr) Circuit d'alimentation en courant
DE4337461A1 (de) Schaltnetzteil
EP0357060A2 (fr) Dispositif de protection contre la surtension pour un circuit électronique
DE2813073A1 (de) Diskriminator-schaltung
EP0203419B1 (fr) Alimentation de puissance à découpage sur le circuit primaire
DE19918041A1 (de) Schaltnetzteil und Verfahren zur Ansteuerung eines Schalters in einem Schaltnetzteil
EP0484570B1 (fr) Alimentation à découpage de type à récupération
DE19730220A1 (de) Getaktete Stromversorgungsanordnung
WO1986005888A1 (fr) Agencement de controle de consommateurs d'electricite dans des vehicules a moteur
DE1156165B (de) Anordnung mit steuerbaren, Zuendeigenschaften besitzenden Halbleiterzellen
DE2302127A1 (de) Ueberspannungsschutz fuer den ausgang eines stabilisierten netzgeraetes
DE29521223U1 (de) Parallelschaltbare Stromversorgung
DE1513670C (de) Schaltungsanordnung zur Regelung eines durch einen Verbraucher fließenden elektrischen Stromes

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): CN JP US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase