WO1998024170A1 - Regulateur a deux points paliers, a assise profonde et a oscillation libre - Google Patents

Regulateur a deux points paliers, a assise profonde et a oscillation libre Download PDF

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Publication number
WO1998024170A1
WO1998024170A1 PCT/DE1997/002349 DE9702349W WO9824170A1 WO 1998024170 A1 WO1998024170 A1 WO 1998024170A1 DE 9702349 W DE9702349 W DE 9702349W WO 9824170 A1 WO9824170 A1 WO 9824170A1
Authority
WO
WIPO (PCT)
Prior art keywords
transistor
short
switching
circuit
switching regulator
Prior art date
Application number
PCT/DE1997/002349
Other languages
German (de)
English (en)
Inventor
Bertold Brockel
Original Assignee
Siemens 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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO1998024170A1 publication Critical patent/WO1998024170A1/fr

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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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/1563—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators without using an external clock

Definitions

  • the invention relates to a self-oscillating step-down switching regulator according to the preamble of claim 1.
  • a secondary switching regulator designed in this way has a high degree of efficiency.
  • an inductance is charged with current in pulses via a switching transistor, the current being maintained during the blocking phase of the switching transistor by a free-wheeling diode by the inductance and a connected load.
  • free-swinging switching regulators have the advantage that they have few components and are not subject to any restrictions with regard to the duty cycle and the control speed.
  • the invention has for its object to provide a particularly economical embodiment of the buck converter mentioned above.
  • the switching regulator according to the invention does not require any special integrated circuits.
  • the switching regulator according to the invention is constructed exclusively with standard components, in particular standard transistors. The invention is described below with reference to an embodiment shown in the drawing.
  • a step-down switching regulator TS with input terminals 1, 2 and output terminals 3 4 is shown in the single figure.
  • An input voltage U1 is present at the input terminals 1, 2, while an output voltage U2 can be tapped at the output terminals 3, 4.
  • a load is usually connected between the two output terminals 3, 4.
  • the input terminal 2 and the output terminal 4 are directly connected to each other.
  • a reference potential OV can be tapped from them.
  • the input terminal 1 is connected to the output terminal 3 via the series circuit comprising a resistor R6, a switching transistor T1 and an inductor L.
  • the input voltage Ul is applied to the emitter of the switching transistor Tl via the resistor R6.
  • a capacitor C1 is connected between the input terminals 1, 2 and a capacitor C2 between the output terminals 3, 4.
  • a free-wheeling diode VI is provided to maintain the current flow through a load (not shown in the figure) between the output terminals 3, 4 during the blocking phase of the switching transistor T1. Its anode is connected to the reference potential OV and its cathode is connected to the collector of the switching transistor T1.
  • a control circuit for the output voltage and, in one embodiment of the invention, a control circuit for the current limitation are provided, each of which, together with the switching transistor T1, enables the step-down switching regulator TS to oscillate.
  • a short-circuit transistor T2 is provided, the emitter of which is connected to the emitter of the switching transistor Tl and the collector of which is connected to the base of the switching transistor Tl. Via the short circuit sistor T2, the emitter-base path of the switching transistor Tl is optionally short-circuited and the switching transistor Tl is thus switched to the blocked or conductive state.
  • a control transistor T3 is provided, the emitter of which is connected to the reference potential OV and the collector of which is connected to the emitter of the switching transistor T1 via the series circuit comprising resistors R3 and R2.
  • the voltage divider point between the two resistors R3 and R2 is connected to the base of the short-circuit transistor T2.
  • the control circuit for the output voltage U2 has a transistor T5, the emitter of which is connected to the output terminal 3 and the collector of which is connected via a resistor R9 to the base of the control transistor T3.
  • the base of the control transistor T3 is further connected to the reference potential via a resistor R4.
  • the base of the transistor T5 is connected to the output terminal 3 via a resistor R8 and to the output terminal 4 via a Z-diode V2. H. connected to the reference potential OV.
  • the cathode of the Zener diode V2 is connected to the base of the transistor T5.
  • a series circuit comprising a resistor R7 and a capacitor C3 is connected between the base of the short-circuit transistor T2 and the collector of the switching transistor T1 to feed the control circuit for the output voltage U2 or for the current control.
  • the transistor T5, the control transistor T3 and the short-circuit transistor T2 are blocked and the switching transistor T1 is therefore switched on.
  • the transistor T5, the control transistor T3 and the short-circuit transistor T2 are conductive and the switching transistor Tl is in the blocked state.
  • the Switching regulator TS oscillates.
  • the switching transistor T1 switches steeply from the blocked to the conductive state and vice versa. Unwanted switching delays of the transistors, in particular of the switching transistor T1 when changing from saturation to the blocked state, are largely eliminated by using the short-circuit transistor T2.
  • the frequency and the duty cycle of the oscillation of the switching regulator TS depend on the dimensioning, the input voltage and the load.
  • a further control circuit is provided for limiting the current in the event of an overload.
  • the current measurement takes place through the resistor R6 between the input terminal 1 and the emitter of the switching transistor T1.
  • the resistor R6 is connected between the emitter and the base of a transistor T4, the collector of which is connected to the base of the control transistor T3 via a resistor R5.
  • the current through resistor R6 causes a voltage drop, which is monitored by transistor T4.
  • the transistor T4 is connected to the base of the control transistor T3 via the resistor R5, as is the transistor T5 for voltage monitoring via the resistor R9.
  • This current monitor forms a second control loop, which also oscillates and behaves in principle like the control loop for monitoring the output voltage U2.
  • the control circuit for current monitoring is only active in the event of an overload.
  • the resistor R6 should preferably be dimensioned such that the voltage drop across it remains below the response threshold of the transistor T4 at the rated load provided for the switching regulator.
  • the current limitation protects the switching regulator TS against destruction in the event of overload and short circuit. An overload occurs temporarily every time the switching regulator TS starts up due to the charging of the smoothing capacitor C2, and even more when it starts up under load. Without the current limitation, the oscillation of the switching regulator TS would only start when the target output voltage was reached. Until then, the switching transistor T1 would be continuously exposed in the conductive state and a considerable overcurrent.
  • the switching regulator TS By using the regulation of the output voltage according to the invention, in conjunction with the current regulation, the switching regulator TS already oscillates before the target output voltage is reached.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

La présente invention concerne un régulateur à deux points paliers (TS), à assise profonde et à oscillation libre, comprenant un transistor de commutation (T1) et un transistor (T5) connecté conductible comme capteur de tension de sortie (U2) en cas de dépassement d'une valeur prescrite d'avance. Selon l'invention, un transistor anti-court-circuit (T2) est prévu pour le trajet émetteur-base du transistor de commutation (T1), ainsi qu'un branchement régénérateur en série, doté d'une résistance (R) et d'une capacité (C) entre l'entrée de commande du transistor anti-court-circuit (T2) et le collecteur du transistor de commutation (T1).
PCT/DE1997/002349 1996-11-22 1997-10-14 Regulateur a deux points paliers, a assise profonde et a oscillation libre WO1998024170A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19648480.4 1996-11-22
DE19648480 1996-11-22

Publications (1)

Publication Number Publication Date
WO1998024170A1 true WO1998024170A1 (fr) 1998-06-04

Family

ID=7812520

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1997/002349 WO1998024170A1 (fr) 1996-11-22 1997-10-14 Regulateur a deux points paliers, a assise profonde et a oscillation libre

Country Status (1)

Country Link
WO (1) WO1998024170A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0964505A2 (fr) * 1998-06-12 1999-12-15 Matsushita Electric Works, Ltd. Convertisseur courant continu-courant continu auto-excité et dispositif d'alimentation de puissance utilisant le même
US6452369B1 (en) 1999-07-13 2002-09-17 Braun Gmbh Output Controlled Buck Converter
EP1422814A1 (fr) * 2002-11-19 2004-05-26 S.I.E.M. S.r.l. Circuit de commande à modulation de largeur d'impulsion en particulier pour applications à basse tension
CN104716832A (zh) * 2013-12-16 2015-06-17 深圳市海洋王照明工程有限公司 一种开关稳压电源
DE102005002359C5 (de) * 2005-01-18 2015-10-29 Puls Gmbh Schaltung zur Strombegrenzung und Verfahren zum Betrieb der Schaltung

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1172544A (en) * 1966-03-07 1969-12-03 Marconi Co Ltd Improvements in or relating to Switched Voltage Regulator Arrangements
US5389871A (en) * 1993-03-19 1995-02-14 Toko, Inc. Self-oscillation type DC-DC converter

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1172544A (en) * 1966-03-07 1969-12-03 Marconi Co Ltd Improvements in or relating to Switched Voltage Regulator Arrangements
US5389871A (en) * 1993-03-19 1995-02-14 Toko, Inc. Self-oscillation type DC-DC converter

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0964505A2 (fr) * 1998-06-12 1999-12-15 Matsushita Electric Works, Ltd. Convertisseur courant continu-courant continu auto-excité et dispositif d'alimentation de puissance utilisant le même
EP0964505A3 (fr) * 1998-06-12 2001-09-12 Matsushita Electric Works, Ltd. Convertisseur courant continu-courant continu auto-excité et dispositif d'alimentation de puissance utilisant le même
US6452369B1 (en) 1999-07-13 2002-09-17 Braun Gmbh Output Controlled Buck Converter
EP1422814A1 (fr) * 2002-11-19 2004-05-26 S.I.E.M. S.r.l. Circuit de commande à modulation de largeur d'impulsion en particulier pour applications à basse tension
DE102005002359C5 (de) * 2005-01-18 2015-10-29 Puls Gmbh Schaltung zur Strombegrenzung und Verfahren zum Betrieb der Schaltung
CN104716832A (zh) * 2013-12-16 2015-06-17 深圳市海洋王照明工程有限公司 一种开关稳压电源
CN104716832B (zh) * 2013-12-16 2019-03-29 深圳市海洋王照明工程有限公司 一种开关稳压电源

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