WO1998024170A1 - Deep-seated free-oscillating switching regulator - Google Patents

Deep-seated free-oscillating switching regulator 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
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Prior art keywords
transistor
short
switching
circuit
switching regulator
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PCT/DE1997/002349
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German (de)
French (fr)
Inventor
Bertold Brockel
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Siemens Aktiengesellschaft
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Publication of WO1998024170A1 publication Critical patent/WO1998024170A1/en

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    • 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.

Abstract

The present invention pertains to a deep-seated free-oscillating switching regulator, comprising a switching transistor (T1) and a transistor (T5) conductively connected as an output voltage sensor (U2) intended to detect whether a possibly set value is exceeded. According to the invention, a short-circuit proof transistor (T2) is provided on the path transmitter-base of the switching transistor (T1), as well as a regenerative serial connection fitted with a resistor (R) and a capacitor (C) between the short-circuit proof transistor control input (T2) and the switching transistor collector (T1).

Description

Beschreibungdescription
Selbstschwingender Tiefsetz-SchaltreglerSelf-oscillating step-down switching regulator
Die Erfindung betrifft einen selbstschwingenden Tiefsetz- Schaltregler gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a self-oscillating step-down switching regulator according to the preamble of claim 1.
Ein solcher Schaltregler ist aus der US-PS 5,389,871 bekannt.Such a switching regulator is known from US Pat. No. 5,389,871.
Es ist allgemein bekannt, zur Erzeugung einer geregelten Gleichspannung aus einer höheren, ungeregelten oder auch geregelten Gleichspannung das Schaltungsprinzip des Tiefsetz- Schaltreglers zu verwenden. Ein derart ausgestalteter Sekun- där-Schaltregler weist einen hohen Wirkungsgrad auf. Bei dem Tiefsetz-Schaltregler wird eine Induktivität impulsweise über einen Schalttransistor mit Strom geladen, wobei der Strom während der Sperrphase des Schalttransistors über eine Frei- laufdiode durch die Induktivität und eine angeschlossene Last aufrechterhalten wird. Hierbei weisen freischwingende Schalt- regier den Vorteil auf, daß sie wenige Bauteile aufweisen und keinerlei Einschränkungen bezüglich des Tastverhältnisses und der Regelgeschwindigkeit unterliegen.It is generally known to use the switching principle of the step-down switching regulator to generate a regulated DC voltage from a higher, unregulated or regulated DC voltage. A secondary switching regulator designed in this way has a high degree of efficiency. In the step-down switching regulator, 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. Here, 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.
Der Erfindung liegt die Aufgabe zugrunde, eine besonders wirtschaftliche Ausführungsform des eingangs genannten Tiefsetz-Schaltreglers anzugeben.The invention has for its object to provide a particularly economical embodiment of the buck converter mentioned above.
Diese Aufgabe wird erfindungsgemäß durch die im Patentanspruch 1 angegebenen Merkmale gelöst .This object is achieved by the features specified in claim 1.
Der erfindungsgemäße Schaltregler benötigt keine speziellen integrierten Schaltkreise. Der erfindungsgemäße Schaltregler ist ausschließlich mit Standardbauteilen, insbesondere Standardtransistoren, aufgebaut. Im folgenden wird die Erfindung anhand eines in der Zeichnung dargestellten Ausführungsbeispieles beschrieben.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.
In der einzigen Figur ist ein Tiefsetz-Schaltregler TS mit Eingangsklemmen 1, 2 und Ausgangsklemmen 3„ 4 dargestellt. An den Eingangsklemmen 1, 2 liegt eine EingangsSpannung Ul an, während an den Ausgangsklemmen 3 , 4 eine AusgangsSpannung U2 abgegriffen werden kann. Zwischen die beiden Ausgangsklemmen 3, 4 ist üblicherweise eine Last geschaltet. Die Eingangsklemme 2 und die Ausgangsklemme 4 sind direkt miteinander verbunden. An ihnen ist ein Bezugspotential OV abgreifbar.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.
Die Eingangsklemme 1 ist über die Serienschaltung aus einem Widerstand R6 , einem Schalttransistor Tl und einer Drossel L mit der Ausgangsklemme 3 verbunden. Die EingangsSpannung Ul liegt über den Widerstand R6 am Emitter des Schalttransistors Tl an. Zur Siebung bzw. Glättung ist zwischen der Eingangs- klemmen 1, 2 ein Kondensator Cl und zwischen die Ausgangsklemmen 3, 4 ein Kondensator C2 geschaltet. Zur Aufrechter- haltung des Stromflusses durch eine in der Figur nicht dargestellten Last zwischen den Ausgangsklemmen 3, 4, während der Sperrphase des Schalttransistors Tl, ist eine Freilaufdiode VI vorgesehen. Deren Anode ist mit dem Bezugspotential OV und deren Kathode ist mit dem Kollektor des Schalttransistors Tl verbunden.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. For screening or smoothing, 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.
Erfindungsgemäß sind ein Regelkreis für die AusgangsSpannung und bei einer Ausgestaltung der Erfindung ein Regelkreis für die Strombegrenzung vorgesehen, die jeweils zusammen mit dem Schalttransistor Tl eine Oszillation des Tiefsetz-Schaltreg- lers TS ermöglichen.According to the invention, 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.
Zur Ansteuerung des Schalttransistors Tl ist ein Kurzschluß- transistor T2 vorgesehen, dessen Emitter mit dem Emitter des Schalttransistors Tl und dessen Kollektor mit der Basis des Schalttransistors Tl verbunden sind. Über den Kurzschlußtran- sistor T2 wird also die Emitter-Basis-Strecke des Schalttransistors Tl wahlweise kurzgeschlossen und damit der Schalttransistor Tl in den gesperrten bzw. leitenden Zustand geschaltet .To control the switching transistor Tl, 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.
Zur Ansteuerung des Kurzschlußtransistors T2 ist beispielsweise ein Steuertransistor T3 vorgesehen, dessen Emitter mit dem Bezugspotential OV verbunden ist und dessen Kollektor über die Serienschaltung aus Widerständen R3 und R2 mit dem Emitter des Schalttransistors Tl verbunden ist. Der Spannungsteilerpunkt zwischen den beiden Widerständen R3 und R2 ist an der Basis des Kurzschlußtransistors T2 angeschaltet.To control the short-circuit transistor T2, for example, 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.
Der Regelkreis für die AusgangsSpannung U2 weist einen Tran- sistor T5 auf, dessen Emitter mit der Ausgangsklemme 3 und dessen Kollektor über einen Widerstand R9 mit der Basis des Steuertransistors T3 verbunden ist. Die Basis des Steuertransistors T3 ist weiter über einen Widerstand R4 mit dem Bezugspotential verbunden. Die Basis des Transistors T5 ist über einen Widerstand R8 mit der Ausgangsklemme 3 und über eine Z-Diode V2 mit der Ausgangsklemme 4, d. h. dem Bezugspotential OV verbunden. Die Kathode der Z-Diode V2 ist an der Basis des Transistors T5 angeschaltet.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.
Zur Mitkopplung für den Regelkreis für die AusgangsSpannung U2 bzw. für die Stromregelung ist eine Serienschaltung aus einem Widerstand R7 und einem Kondensator C3 zwischen die Basis des Kurzschlußtransistors T2 und den Kollektor des Schalttransistors Tl geschaltet.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.
Im geregelten Zustand stellt sich an den Ausgangsklemmen 3, L. eine AusgangsSpannung U2 ein, deren Wert der Summe aus der Z- Spannung der Z-Diode V2 und der Basis-Emitter-Durchlaßspannung des Transistors T5 entspricht. Unterhalb dieses Wertes der AusgangsSpannung U2 sind der Transistor T5, der Steuertransistor T3 und der Kurzschlußtransistor T2 gesperrt und der Schalttransistor Tl ist daher leitend geschaltet. Ober¬ halb dieses Wertes sind der Transistor T5 , der Steuertransistor T3 und der Kurzεchlußtransistor T2 leitend und der Schalttransistor Tl im gesperrten Zustand.In the regulated state, the output terminals 3, L. an output voltage U2, the value of which corresponds to the sum of the Z voltage of the Z diode V2 and the base-emitter forward voltage of the transistor T5. Below this value of the output voltage U2, the transistor T5, the control transistor T3 and the short-circuit transistor T2 are blocked and the switching transistor T1 is therefore switched on. Above this value, 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.
Wegen der hohen Kreisverstärkung im Regelkreis für die Aus- gangsspannung U2 , vor allem aber durch die Mitkopplung über die Serienschaltung aus dem Widerstand R7 und dem Kondensator C3 stellen sich keine stabilen Zwischenzustände der Transi- stören Tl , T2 , T3 und T5 ein, sondern der Schaltregler TS oszilliert. Der Schalttransistor Tl schaltet dabei steilflan- kig vom gesperrten in den leitenden Zustand und umgekehrt . Unerwünschte Schaltverzögerungen der Transistoren, insbesondere des Schalttransistors Tl beim Übergang aus der Sättigung zum gesperrten Zustand sind durch die Verwendung des Kurz- schlußtransistors T2 weitgehend ausgeschaltet. Die Frequenz und das Tastverhältnis der Oszillation des Schaltreglers TS hängen von der Dimensionierung, der EingangsSpannung und der Last ab.Because of the high loop gain in the control loop for the output voltage U2, but above all due to the positive feedback via the series connection from the resistor R7 and the capacitor C3, there are no stable intermediate states of the transistors T1, T2, T3 and T5, but rather 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.
Bei einer vorteilhaften Ausgestaltung der Erfindung ist ein weiterer Regelkreis für die Strombegrenzung im Überlastfall vorgesehen. Die Strommessung erfolgt dabei durch den Widerstand R6 zwischen der Eingangsklemme 1 und dem Emitter des Schalttransistors Tl.In an advantageous embodiment of the invention, 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.
Der Widerstand R6 ist zwischen den Emitter und die Basis eines Transistors T4 geschaltet, dessen Kollektor über einen Widerstand R5 mit der Basis des Steuertransistors T3 verbun- den ist.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.
Der Strom durch den Widerstand R6 bewirkt einen Spannungsabfall, der vom Transistor T4 überwacht wird. Der Transistor T4 ist über den Widerstand R5 ebenso mit der Basis des Steuer- transistors T3 verbunden wie der Transistor T5 für die Spannungsüberwachung über den Widerstand R9. Dies ergibt eine Oder-Verknüpfung für die beiden Regelkreise, d.h. für die Spannungs- und für die Stromüberwachung. Diese Stromüberwachung bildet einen zweiten Regelkreis, der ebenfalls oszilliert und sich prinzipiell wie der Regelkreis für die Überwa- chung der AusgangsSpannung U2 verhält.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 gives one OR link for the two control loops, ie for voltage and current monitoring. 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.
Der Regelkreis für die Stromüberwachung ist nur im Überlast- fall aktiv. Der Widerstand R6 ist vorzugsweise so zu dimensionieren, daß der Spannungsabfall an ihm bei der für den Schaltregler vorgesehenen Nennlast noch unterhalb der An- sprechschwelle des Transistors T4 bleibt.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.
Die Strombegrenzung schützt den Schaltregler TS gegen Zerstörung bei Überlast und Kurzschluß. Eine Überlast tritt vor- übergehend bei jedem Hochlauf des Schaltreglers TS durch das Laden des Glättungskondensators C2 , und mehr noch beim Hochlauf unter Last auf. Ohne die Strombegrenzung würde die Oszillation des Schaltreglers TS erst beim Erreichen der Soll- Ausgangspanung einsetzen. Bis dahin wäre der Schalttransistor Tl dauernd im leitenden Zustand und einem erheblichem Überstrom ausgesetzt.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.
Durch die Verwendung der erfindungsgemäßen Regelung der Aus- gangsspannung ergibt sich in Verbindung mit der Stromregelung schon eine Oszillation des Schaltreglers TS vor dem Erreichen der Soll-Ausgangsspannung . 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.
BezugεzeichenlisteReference symbol list
1, 2 Eingangsklemmen1, 2 input terminals
3, 4 Ausgangs le men3, 4 output lines
OV BezugspotentialOV reference potential
Cl...C3 KondensatorenCl ... C3 capacitors
L DrosselL throttle
Rl ...R9 WiderständeRl ... R9 resistors
Tl ...T5 TransistorenTl ... T5 transistors
TS Tiefsetz-SchaltreglerTS step-down switching regulator
Ul EingangsSpannungUl input voltage
U2 AusgangsSpannungU2 output voltage
VI FreilaufdiodeVI freewheeling diode
V2 Z-Diode V2 Z diode

Claims

Patentansprüche claims
l. Selbstschwingender Tiefsetz-Schaltregler (TS) , mit einem Schalttransistor (Tl) , an dessen Emitter eine Eingangsεpannung (Ul) anliegt und an dessen Kollektor über eine Induktivität (L) eine AusgangsSpannung (U2) abgreifbar ist, und mit einem Transistor (T5) , der als Spannungssensor für die AusgangsSpannung (U2) bei Überschreitung eines vorgebbaren Sollwertes leitend geschaltet wird, gekennzeichnet durch einen vom Transistor (T5) steuerbaren Kurzschlußtransistor (T2) für die Emitter-Basis-Strecke des Schalttransistors (Tl) , eine mitkoppelnde Serienschaltung mit einem Widerstand (R) und einer Kapazität (C) zwischen dem Steuereingang des Kurz- schlußtransistors (T2) und dem Kollektor des Schalttransistors (Tl) , und eine hohe Kreisverstärkung im Regelkreis für den Schalttran- sistor (Tl) mit dem Transistor (T5) und dem Kurzschlußtransistor (T2) , durch die in Verbindung mit der Serienschaltung die Oszillation des Schaltreglers (TS) bewirkt wird.l. Self-oscillating step-down switching regulator (TS), with a switching transistor (Tl), at whose emitter an input voltage (Ul) is applied and at whose collector an output voltage (U2) can be tapped via an inductor (L), and with a transistor (T5), which is switched on as a voltage sensor for the output voltage (U2) when a predetermined setpoint is exceeded, characterized by a short-circuit transistor (T2) controllable by the transistor (T5) for the emitter-base path of the switching transistor (Tl), a series coupling with a resistor (R) and a capacitance (C) between the control input of the short-circuit transistor (T2) and the collector of the switching transistor (Tl), and a high loop gain in the control circuit for the switching transistor (Tl) with the transistor (T5) and the Short-circuit transistor (T2), through which the oscillation of the switching regulator (TS) is effected in connection with the series connection.
2. Tiefsetz-Schaltregler nach Anspruch 1, gekennzeichnet du ch einen Steuertransistor (T3) , über den der Kurzschlußtransistor (T2) angesteuert ist.2. buck converter according to claim 1, characterized du ch a control transistor (T3), via which the short-circuit transistor (T2) is driven.
3. Tiefsetz-Schaltregler nach Anspruch 1 oder 2, gekennzeichnet durch einen weiteren Transistor (T4) , der als Stromsensor für den Eingangsstrom bei Überschreitung eines vorgebbaren Sollwertes leitend geschaltet wird und den Kurzschlußtransistor (T2) ansteuert . 3. step-down switching regulator according to claim 1 or 2, characterized by a further transistor (T4) which is turned on as a current sensor for the input current when a predetermined target value is exceeded and drives the short-circuit transistor (T2).
4. Tiefsetz-Schaltregler nach Anspruch 3, gekennzeichnet durch eine Oder-Verknüpfung am Steuertransistor (T3) für den Stromsensor (T4) und den Spannungssensor (T5) , über die der Kurz- schlußtransistor (T2) angesteuert ist. 4. step-down switching regulator according to claim 3, characterized by an OR operation on the control transistor (T3) for the current sensor (T4) and the voltage sensor (T5), via which the short-circuit transistor (T2) is driven.
PCT/DE1997/002349 1996-11-22 1997-10-14 Deep-seated free-oscillating switching regulator WO1998024170A1 (en)

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DE19648480.4 1996-11-22
DE19648480 1996-11-22

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0964505A2 (en) * 1998-06-12 1999-12-15 Matsushita Electric Works, Ltd. Self-excited DC-DC converter and a power supply device using same
US6452369B1 (en) 1999-07-13 2002-09-17 Braun Gmbh Output Controlled Buck Converter
EP1422814A1 (en) * 2002-11-19 2004-05-26 S.I.E.M. S.r.l. PWM control circuit particularly for low-voltage applications
CN104716832A (en) * 2013-12-16 2015-06-17 深圳市海洋王照明工程有限公司 Stabilized switching power supply
DE102005002359C5 (en) * 2005-01-18 2015-10-29 Puls Gmbh Current limiting circuit and method of operating the circuit

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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

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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 (en) * 1998-06-12 1999-12-15 Matsushita Electric Works, Ltd. Self-excited DC-DC converter and a power supply device using same
EP0964505A3 (en) * 1998-06-12 2001-09-12 Matsushita Electric Works, Ltd. Self-excited DC-DC converter and a power supply device using same
US6452369B1 (en) 1999-07-13 2002-09-17 Braun Gmbh Output Controlled Buck Converter
EP1422814A1 (en) * 2002-11-19 2004-05-26 S.I.E.M. S.r.l. PWM control circuit particularly for low-voltage applications
DE102005002359C5 (en) * 2005-01-18 2015-10-29 Puls Gmbh Current limiting circuit and method of operating the circuit
CN104716832A (en) * 2013-12-16 2015-06-17 深圳市海洋王照明工程有限公司 Stabilized switching power supply
CN104716832B (en) * 2013-12-16 2019-03-29 深圳市海洋王照明工程有限公司 A kind of switching power supply

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