WO1990001248A1 - A circuit arrangement for a power supply unit - Google Patents

A circuit arrangement for a power supply unit Download PDF

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Publication number
WO1990001248A1
WO1990001248A1 PCT/AT1989/000065 AT8900065W WO9001248A1 WO 1990001248 A1 WO1990001248 A1 WO 1990001248A1 AT 8900065 W AT8900065 W AT 8900065W WO 9001248 A1 WO9001248 A1 WO 9001248A1
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WO
WIPO (PCT)
Prior art keywords
voltage
emitter
switching transistor
power supply
capacitor
Prior art date
Application number
PCT/AT1989/000065
Other languages
German (de)
French (fr)
Inventor
Wolfgang Grabner
Otmar Bitsche
Peter Arneitz
Original Assignee
Stylux Gesellschaft Für Lichtelektronik M.B.H.
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 Stylux Gesellschaft Für Lichtelektronik M.B.H. filed Critical Stylux Gesellschaft Für Lichtelektronik M.B.H.
Publication of WO1990001248A1 publication Critical patent/WO1990001248A1/en

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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
    • H02M3/22—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
    • H03K17/082—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit
    • H03K17/0826—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit in bipolar transistor switches
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/282—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices
    • H05B41/2821—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices by means of a single-switch converter or a parallel push-pull converter in the final stage
    • H05B41/2824—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices by means of a single-switch converter or a parallel push-pull converter in the final stage using control circuits for the switching element
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
    • H03K2217/0036—Means reducing energy consumption

Definitions

  • the invention relates to a circuit arrangement for a switching power supply.
  • Switched-mode power supplies are now being used more and more frequently in 5 places of regulated power supplies, since their power dissipation is much lower. It is often necessary to keep the output voltage of the switching power supplies constant under different load conditions. This takes place most expediently with corresponding circuits which act on the switching transistor or on its control circuit, but which are very complex and complex in their construction.
  • the object of the invention is to create a special circuit arrangement with which the collector-emitter voltage of the switching transistor can be monitored in a switching network with little expenditure on components.
  • the switched-mode power supply consists of a choke-capacitor series circuit connected to a DC voltage smoothed with a capacitor, the capacitor, which is connected to a terminal nr with zero potential, a free-wheeling diode and the collector-emitter path of a switching transistor are connected in parallel and that either parallel to the choke-capacitor series circuit or decoupled via a transformer, the primary winding of which in series
  • a load preferably a gas discharge lamp
  • the base of the switching transistor is connected to a control circuit, to which at a second input either the collector of a further transistor whose emitter is connected to
  • Switching power supply is placed and that the switching transistor has an emitter resistor and the emitter of the switching transistor is connected to an input in the control circuit.
  • the switching transistor in the switched-mode power supply is monitored with regard to its saturation voltage and when it falls below this, the control circuit is acted on via the transistor or the comparator.
  • a circuit power supply is automatically synchronized by the circuit arrangement.
  • FIGS. 1 and 2 show the two variants of the circuit and FIG. 3 shows voltage-time diagrams to explain the function of the circuit arrangement.
  • the rectified voltage U of a bridge rectifier reaches the terminals 1, 2, which is connected to the primary side, for example, to the mains voltage.
  • the negative pole 2 of the voltage U is connected to zero potential P.
  • the smoothing capacitor C1 is connected to the voltage U and serves to minimize the ripple of this voltage U.
  • the following Dr ⁇ ssel capacitor series circuit L2, C2 of the switching power supply in the two circuit variants in Fig. 1 and Fig. 2 consists of the primary winding Ll of the transformer Ll, Ll fe , which serves to isolate the switching power supply from the load Er, which Choke L2 and the capacitor C2 connected to a connection with zero potential P.
  • a freewheeling diode D2 and the collector-emitter path of the switching transistor Tl are connected in parallel with the capacitor C2 an emitter resistor R3 arranged.
  • the base connection of the switching transistor Tl is connected to a control circuit AS, at whose connection El square-wave signals occur.
  • the load R_ which is a metal vapor lamp, is connected to the secondary winding L1, of the transformer L1, L1. The one at the load. applied voltage is the output voltage of the switching power supply.
  • the collector of a transistor T2 is connected to a further connection E2 of the control circuit AS, the emitter of which is connected to a voltage U1.
  • this transistor T2 has a base-emitter resistor R2 and a base series resistor R1.
  • the base series resistor Rl is connected via a diode Dl to the connection of the inductor L2 to the capacitor C2, the anode of the diode Dl being connected to the base series resistor Rl.
  • the emitter of the switching transistor Tl is also connected to a third connection E3 in the control circuit AS.
  • a comparator K1 is provided in the circuit in FIG. 2, which is connected to the output at the input E2 in the control circuit AS.
  • a reference voltage U R is applied to the input 3 of the comparator Kl - and the anode of a diode D1 and a resistor R4 are connected to the input 4.
  • the resistor R4 is acted upon by the voltage U "and the cathode of the diode Dl is connected to the connection of the inductor L2 to the capacitor C2.
  • the emitter of the switching transistor T1 is connected to a third connection E3 in the control circuit AS.
  • FIG. 3 The operation of the circuit in FIG. 1, which is very similar to that in FIG. 2, will now be explained with reference to the voltage-time diagram in FIG. 3.
  • the voltage U and the collector current I are shown combined in the uppermost diagram. Below this, the voltage curve at the collector of transistor T2 can be seen and the bottom diagram also shows the curve of the voltage at the base of switching transistor T1.
  • Voltage U R1 U H «(R1 / R1 + R2), transistor T2 switches through.
  • the switching transistor T1 also receives a positive base voltage via the control circuit AS. If the current I and thus the voltage drop across the resistor R3 reaches a value set in the control circuit AS, the transistor T1 switches off. The voltage U across the capacitor C2 increases and the transistor T2 blocks. If the voltage U CE at the switching transistor Tl rises above the value U R1 , the transistor T2 also switches off and prevents the switching transistor Tl from becoming too saturated.
  • the capacitor KL takes over the task of the transistor T2 from FIG. 1.
  • the circuit is particularly suitable for electronic ballasts for gas discharge lamps, such as Metal halide lamps, which consist of a switching power supply.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
  • Dc-Dc Converters (AREA)

Abstract

Power supply units are used instead of controlled mains units on account of their lower power losses. It is the pupose of the circuit arrangement described below to monitor the collector-emitter voltage of the switching transistor in a power supply unit. Here, the power supply unit itself consists of a choke capacitor series circuit connected to the d.c. voltage in which a recovery diode and the collector-emitter track of the switching transistor are connected in parallel to the capacitor. The load, a gas discharge lamp, is connected via a transformer. The base of the switching transistor is connected to a control circuit to a second input of which is connected the collector of a transistor with a base-emitter resistor and a base series resistor, the latter being applied to the choke and capacitor connection via a diode. One input of the emitter of the switching transistor is connected to the control circuit. This circuit monitors the saturation voltage of the switching transistor and, when it is not reached, the control circuit is operated upon via the transistor.

Description

Schaltungsanordnung für ein Schaltnetzteil Circuit arrangement for a switching power supply
Die Erfindung betrifft eine Schaltungsanordnung für ein Schaltnetzteil.The invention relates to a circuit arrangement for a switching power supply.
Schaltnetzteile werden heutzutage immer häufiger an 5 Stelle von geregelten Netzgeräten verwendet, da ihre Verlustleistung wesentlich geringer ist. Oft ist es notwendig die Ausgangsspannung der Schaitnetzteile bei unterschiedlichen Lastverhältnissen konstant zu halten. Dies erfolgt am zielführendsten mit entsprechenden auf 10 den Schalttransistor bzw. auf dessen Ansteuerschaltung wirkenden Schaltungen, die jedoch in ihrem Aufbau sehr aufwendig und kompliziert sind.Switched-mode power supplies are now being used more and more frequently in 5 places of regulated power supplies, since their power dissipation is much lower. It is often necessary to keep the output voltage of the switching power supplies constant under different load conditions. This takes place most expediently with corresponding circuits which act on the switching transistor or on its control circuit, but which are very complex and complex in their construction.
Die Aufgabe der Erfindung besteht nun darin eine spezi- 15 eile Schaltungsanordnung zu schaffen, mit der mit ge¬ ringem Bauteilaufwand die Kollektor-Emitter-Spannung des Schalttransistors in einem Schaltnetzteii überwacht werden kann.The object of the invention is to create a special circuit arrangement with which the collector-emitter voltage of the switching transistor can be monitored in a switching network with little expenditure on components.
20 Die Aufgabe wird durch die Erfindung gelöst. Diese ist dadurch gekennzeichnet, daß das Schaltnetzteil aus einer an einer mit einem Kondensator geglätteten Gleichspannung angeschlossenen Drossel-Kondensator-Seriεnschaltung besteht, wobei dem Kondensator, der mit einem Anschluß n r mit Nulipotential verbunden ist, eine Freilaufdiode und die Kollektor-Emitter-Strecke eines Schalttransistors parallel geschaltet sind und daß entweder parallel zur Drossel-Kondensator-Serienschaltung oder entkoppelt über einen Transformator, dessen Primärwicklung in Serie zur20 The object is achieved by the invention. This is characterized in that the switched-mode power supply consists of a choke-capacitor series circuit connected to a DC voltage smoothed with a capacitor, the capacitor, which is connected to a terminal nr with zero potential, a free-wheeling diode and the collector-emitter path of a switching transistor are connected in parallel and that either parallel to the choke-capacitor series circuit or decoupled via a transformer, the primary winding of which in series
30 Drossel vorgesehen ist, eine Last, vorzugsweise eine Gasentladungslampe, angeschlossen ist und daß die Basis des Schaittransistors mit einer Ansteuerschaltung ver¬ bunden ist, an der an einem zweiten Eingang entweder der Kollektor eines weiteren Transistors, dessen Emitter an30 choke is provided, a load, preferably a gas discharge lamp, is connected and that the base of the switching transistor is connected to a control circuit, to which at a second input either the collector of a further transistor whose emitter is connected to
- einer Spannung liegt und der einen Basis-Emitter-Wider¬ stand und einen Basis-Vorwiderstand aufweist, der mit der Anode einer Diode verbunden ist, oder der Ausgang eines Komparators angeschlossen ist, wobei an einem Eingang des Komparators eine Referenzspannung anliegt und der zweite Eingang mit der Diode und über einen Widerstand mit einer Spannung verbunden ist und daß die Diode mit der Katode an die Verbindung von Drossel und Kondensator des- Is a voltage and which has a base-emitter resistor and a base series resistor which is connected to the anode of a diode, or the output of a Comparator is connected, wherein a reference voltage is present at an input of the comparator and the second input is connected to the diode and via a resistor to a voltage and that the diode with the cathode to the connection of the choke and capacitor of the
Schaltnetzteiles gelegt ist und daß der Schalttransistor einen Emitterwiderstand aufweist und der Emitter des Schalttransistors mit einem Eingang bei der Ansteuer¬ schaltung verbunden ist. Dadurch wird der Schalttransi- stör im Schaltnetzteil bezüglich seiner Sättigungsspan¬ nung überwacht und bei deren unterschreiten wird über den Transistor oder den Komparator auf die Ansteuerschaltung eingewirkt. Allgemein kann gesagt werden, daß sich durch die Schaltungsanordnung ein Schaitnetzteil selbsttätig synchronisiert.Switching power supply is placed and that the switching transistor has an emitter resistor and the emitter of the switching transistor is connected to an input in the control circuit. As a result, the switching transistor in the switched-mode power supply is monitored with regard to its saturation voltage and when it falls below this, the control circuit is acted on via the transistor or the comparator. In general, it can be said that a circuit power supply is automatically synchronized by the circuit arrangement.
Eine nähere Erläuterung der Erfindung erfolgt nachstehend an Hand der Zeichnungen. Die Figuren 1 und 2 zeigen die beiden Varianten der Schaltung und Fig. 3 stellt Span- nungszeitdiagramme zur Erläuterung der Funktion der Schaltungsanordnung dar.The invention is explained in more detail below with reference to the drawings. FIGS. 1 and 2 show the two variants of the circuit and FIG. 3 shows voltage-time diagrams to explain the function of the circuit arrangement.
Bei den Fig. 1 und 2 gelangt an die Klemmen 1,2 die gleichgerichtete Spannung U eines Brückengleichrichters, der primärseitig z.B. an der Netzspannung liegt. Der negative Pol 2 der Spannung U ist mit Nullpotential P verbunden. Der Glättungskondensator Cl ist an die Span¬ nung U gelegt und dient zur Minimierung der Welligkeit dieser Spannung U . Die nachfolgende Drσssel-Kondensa- tor-Serienschaltung L2,C2 des Schaltnetzteiles besteht bei den beiden Schaltungsvarianten in Fig. 1 und Fig. 2 aus der Primärwicklung Ll des Transformators Ll,Llfe, der zur Potentialtrennung des Schaltnetzteiles von der Last E-r dient, der Drossel L2 und dem mit einem Anschluß mit Nullpσtential P verbundenem Kondensator C2. Parallel zum Kondensator C2 ist eine Freilaufdiode D2, sowie die Kollektor-Emitter-Strecke des Schalttransistors Tl mit einem Emitterwiderstand R3 angeordnet. Der Basisanschluß des Schalttransistors Tl ist mit einer Ansteuerschaltung AS, an deren Anschluß El Rechtecksignale auftreten, verbunden. An die Sekundärwicklung Ll, des Transformators L1,L1, ist die Last R_, die eine Metalldampflampe ist, angeschlos¬ sen. Die an der Last . anstehende Spannung ist die Ausgangsspannung des Schaltnetzteiles.1 and 2, the rectified voltage U of a bridge rectifier reaches the terminals 1, 2, which is connected to the primary side, for example, to the mains voltage. The negative pole 2 of the voltage U is connected to zero potential P. The smoothing capacitor C1 is connected to the voltage U and serves to minimize the ripple of this voltage U. The following Drσssel capacitor series circuit L2, C2 of the switching power supply in the two circuit variants in Fig. 1 and Fig. 2 consists of the primary winding Ll of the transformer Ll, Ll fe , which serves to isolate the switching power supply from the load Er, which Choke L2 and the capacitor C2 connected to a connection with zero potential P. A freewheeling diode D2 and the collector-emitter path of the switching transistor Tl are connected in parallel with the capacitor C2 an emitter resistor R3 arranged. The base connection of the switching transistor Tl is connected to a control circuit AS, at whose connection El square-wave signals occur. The load R_, which is a metal vapor lamp, is connected to the secondary winding L1, of the transformer L1, L1. The one at the load. applied voltage is the output voltage of the switching power supply.
Bei der Schaltungsvariante in Fig. 1 ist mit einem weiteren Anschluß E2 der Ansteuerschaltung AS der Kol¬ lektor eines Transistors T2 verbunden, dessen Emitter an einer Spannung U„ liegt. Außerdem weist dieser Transistor T2 einen Basis-Emitter-Widerstand R2 und einen Basis- Vorwiderstand Rl auf. Der Basis-Vorwiderstand Rl ist über eine Diode Dl an die Verbindung der Drossel L2 mit dem Kondensator C2 angeschlossen, wobei die Anode der Diode Dl mit dem Basis-Vorwiderstand Rl verbunden ist. An einen dritten Anschluß E3 bei der Ansteuerschaltung AS ist noch der Emitter des Schalttransistors Tl gelegt.In the circuit variant in FIG. 1, the collector of a transistor T2 is connected to a further connection E2 of the control circuit AS, the emitter of which is connected to a voltage U1. In addition, this transistor T2 has a base-emitter resistor R2 and a base series resistor R1. The base series resistor Rl is connected via a diode Dl to the connection of the inductor L2 to the capacitor C2, the anode of the diode Dl being connected to the base series resistor Rl. The emitter of the switching transistor Tl is also connected to a third connection E3 in the control circuit AS.
An Stelle des Transistors T2 ist bei der Schaltung in Fig. 2 ein Komparator Kl vorgesehen, der mit dem Ausgang an den Eingang E2 bei der Ansteuerschaltung AS verbunden ist. An den Eingang 3 des Komparators Kl gelangt eine Referenzspannung UR - und am Eingang 4 ist die Anode einer Diode Dl, sowie ein Widerstand R4 angeschlossen. Der Widerstand R4 wird mit der Spannung U„ beaufschlagt und die Katode der Diode Dl ist an die Verbindung der Drossel L2 mit dem Kondensator C2 angeschlossen. Auch hier ist an einen dritten Anschluß E3 bei der Ansteuer¬ schaltung AS der Emitter des Schalttransistors Tl gelegt.Instead of the transistor T2, a comparator K1 is provided in the circuit in FIG. 2, which is connected to the output at the input E2 in the control circuit AS. A reference voltage U R is applied to the input 3 of the comparator Kl - and the anode of a diode D1 and a resistor R4 are connected to the input 4. The resistor R4 is acted upon by the voltage U "and the cathode of the diode Dl is connected to the connection of the inductor L2 to the capacitor C2. Here, too, the emitter of the switching transistor T1 is connected to a third connection E3 in the control circuit AS.
Die Funktionsweise der Schaltung in Fig. 1, die jener in Fig. 2 sehr ähnlich ist, wird nun an Hand des Spannungszeitdiagrammes in Fig. 3 erläutert. Hierin sind im obersten Diagramm die Spannung U und der Kollektorstrom I vereinigt dargestellt. Darunter ist der Spannungsverlauf am Kollektor des Transistors T2 zu sehen und dem untersten Diagramm ist noch der Verlauf der Spannung an der Basis des Schalttransistors Tl zu ent¬ nehmen.The operation of the circuit in FIG. 1, which is very similar to that in FIG. 2, will now be explained with reference to the voltage-time diagram in FIG. 3. The voltage U and the collector current I are shown combined in the uppermost diagram. Below this, the voltage curve at the collector of transistor T2 can be seen and the bottom diagram also shows the curve of the voltage at the base of switching transistor T1.
Sinkt die Spannung U am Kondensator C2 unter die an der Basis des Transistors T2 mit dem Spannungsteiler, bestehend aus den Widerständen R1,R2, eingestellteIf the voltage U across the capacitor C2 drops below that set at the base of the transistor T2 with the voltage divider consisting of the resistors R1, R2
Spannung UR1 = UH«(R1/R1+R2) , so schaltet der Transistor T2 durch. Der Schalttransistor Tl erhält über die An¬ steuerschaltung AS ebenfalls eine positive Basisspannung. Erreicht der Strom I und damit der Spannungsabfall am Widerstand R3 einen in der Ansteuerschaltung AS einge¬ stellten Wert, so schaltet der Transistor Tl aus. Die Spannung U am Kondensator C2 steigt an und der Transi- stör T2 sperrt. Steigt die Spannung UCE am Schalttransi¬ stor Tl über den Wert UR1 schaltet der Transistor T2 ebenfalls ab und verhindert, daß der Schalttransistor Tl zu stark entsättigt wird.Voltage U R1 = U H «(R1 / R1 + R2), transistor T2 switches through. The switching transistor T1 also receives a positive base voltage via the control circuit AS. If the current I and thus the voltage drop across the resistor R3 reaches a value set in the control circuit AS, the transistor T1 switches off. The voltage U across the capacitor C2 increases and the transistor T2 blocks. If the voltage U CE at the switching transistor Tl rises above the value U R1 , the transistor T2 also switches off and prevents the switching transistor Tl from becoming too saturated.
Bei der Schaltung in Fig. 2 übernimmt der Koraparator Kl die Aufgabe des Transistors T2 aus Fig. 1.In the circuit in FIG. 2, the capacitor KL takes over the task of the transistor T2 from FIG. 1.
Abschließend kann noch gesagt werden, daß sich die Schaltung besonders für elektronische Vorschaltgeräte für Gasentladungslampen, wie z.B. Metalldampflampen, die aus einem Schaltnetzteil bestehen eignet. Finally, it can be said that the circuit is particularly suitable for electronic ballasts for gas discharge lamps, such as Metal halide lamps, which consist of a switching power supply.

Claims

PATENTANSPRUCH PATENT CLAIM
Schaltungsanordnung für ein Schaltnetzteii, dadurch gekennzeichnet, daß das Schaltnetzteil aus einer an einer mit einem Kondensator (Cl) geglätteten Gleich¬ spannung (U ) angeschlossenen Drossel-Kondensator- Serienschaltung (L2, C2) besteht, wobei dem Konden¬ sator (C2), der mit einem Anschluß mit Nullpotential (P ) verbunden ist, eine Freilaufdiode (D2) und die Kollek- tor-Emitter-Strecke eines Schalttransistors (Tl) parallel geschaltet sind und daß entweder parallel zur Drossel- Kondensator-Serienschaltung (L2, C2) oder entkoppelt über einen Transformator (Ll, Ll, ), dessen Primärwicklung (Ll) in Serie zur Drossel (L2) vorgesehen ist, eine Last (Rr), vorzugsweise eine Gasentladungslampe, angeschlossen ist und daß die Basis des Schalttransistors (Tl) mit einer Ansteuerschaltung (AS) verbunden ist, an der an einem zweiten Eingang (E2) entweder der Kollektor eines weiteren Transistors (T2), dessen Emitter an einer Spannung (U„) liegt und der einen Basis-Emitter-Wider¬ stand (R2) und einen Basis-Vorwiderstand (Rl) aufweist, der mit der Anode einer Diode (Dl) verbunden ist, oder der Ausgang eines Komparators (Kl) angeschlossen ist, wobei an einem Eingang (3) des Komparators eine Refe- renzspannung (UR f) anliegt und der zweiteCircuit arrangement for a switching power supply, characterized in that the switching power supply consists of a choke-capacitor series circuit (L2, C2) connected to a DC voltage (U) smoothed with a capacitor (Cl), the capacitor (C2), which is connected to a connection with zero potential (P), a free-wheeling diode (D2) and the collector-emitter path of a switching transistor (Tl) are connected in parallel and that either in parallel with the inductor-capacitor series circuit (L2, C2) or decoupled via a transformer (Ll, Ll,), whose primary winding (Ll) is provided in series with the choke (L2), a load (R r ), preferably a gas discharge lamp, is connected and that the base of the switching transistor (Tl) with a Control circuit (AS) is connected, at which at a second input (E2) either the collector of a further transistor (T2), the emitter of which is connected to a voltage (U "), and the one base-emitter resistor nd (R2) and a base series resistor (Rl), which is connected to the anode of a diode (Dl), or the output of a comparator (Kl) is connected, a reference voltage at an input (3) of the comparator (U R f ) and the second
Eingang (4) mit der Diode (Dl) und über einen Wider¬ stand (R4) mit einer Spannung (U„) verbunden ist und daß die Diode (Dl) mit der Katode an die Verbindung von Drossel (L2) und Kondensator (C2) des Schaltnetzteiles gelegt ist und daß der Schalttransistor (Tl) einen Emitterwiderstand (R3) aufweist und der Emitter des Schalttransistors (Tl) mit einem Eingang (E3) bei der Ansteuerschaltung (AS) verbunden ist. Input (4) is connected to the diode (Dl) and via a resistor (R4) to a voltage (U ") and that the diode (Dl) with the cathode connects to the reactor (L2) and capacitor (C2 ) of the switching power supply and that the switching transistor (Tl) has an emitter resistor (R3) and the emitter of the switching transistor (Tl) is connected to an input (E3) in the control circuit (AS).
PCT/AT1989/000065 1988-07-25 1989-07-25 A circuit arrangement for a power supply unit WO1990001248A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA1887/88 1988-07-25
AT188788A AT394917B (en) 1988-07-25 1988-07-25 CIRCUIT ARRANGEMENT FOR A SWITCHING POWER SUPPLY

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WO1990001248A1 true WO1990001248A1 (en) 1990-02-08

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AT (1) AT394917B (en)
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* Cited by examiner, † Cited by third party
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WO1993004570A1 (en) * 1991-08-27 1993-03-04 Julius Hartai Frequency-modulated converter with a series-parallel resonance
FR2693074A1 (en) * 1992-06-26 1993-12-31 Valeo Vision Power supply circuit for car headlight discharge bulb - has micro-programmable unidirectional quasi-resonant switch with high voltage transformer producing smoothed output voltage
EP0521229B1 (en) * 1991-10-22 1996-08-14 MECKIND srl Device to display images illuminated from behind, particularly advertising images
EP0936845A1 (en) * 1998-02-10 1999-08-18 STMicroelectronics S.A. Device for lighting and operating a fluorescent lamp
WO2000015013A2 (en) * 1998-09-03 2000-03-16 Electro-Mag International, Inc. Ballast circuit with lamp current regulating circuit
US6107750A (en) * 1998-09-03 2000-08-22 Electro-Mag International, Inc. Converter/inverter circuit having a single switching element
WO2015104277A1 (en) * 2014-01-13 2015-07-16 Koninklijke Philips N.V. Self-oscillating circuit

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3922582A (en) * 1974-08-22 1975-11-25 Gte Sylvania Inc Current limited oxcillator arrangement
US4488090A (en) * 1982-09-07 1984-12-11 Jack Hodson Advertising sign system
US4613934A (en) * 1984-03-19 1986-09-23 Pacholok David R Power supply for gas discharge devices
US4613796A (en) * 1984-08-13 1986-09-23 Gte Products Corporation Single transistor oscillator ballast circuit

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES435042A1 (en) * 1975-02-24 1976-12-01 Fernandez Olivella Improvements in the activation of discharge lamps. (Machine-translation by Google Translate, not legally binding)
CH637251A5 (en) * 1978-12-22 1983-07-15 Contrinex Sa POWER SUPPLY ARRANGEMENT FOR SUPPLYING AN INDUCTIVE OR OHMIC-INDUCTIVE LOAD.
FR2524244B1 (en) * 1982-03-24 1985-07-26 Hennequin & Cie Sa DEVICE FOR SUPPLYING FLUORESCENT TUBES BY A CONTINUOUS SOURCE

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3922582A (en) * 1974-08-22 1975-11-25 Gte Sylvania Inc Current limited oxcillator arrangement
US4488090A (en) * 1982-09-07 1984-12-11 Jack Hodson Advertising sign system
US4613934A (en) * 1984-03-19 1986-09-23 Pacholok David R Power supply for gas discharge devices
US4613796A (en) * 1984-08-13 1986-09-23 Gte Products Corporation Single transistor oscillator ballast circuit

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993004570A1 (en) * 1991-08-27 1993-03-04 Julius Hartai Frequency-modulated converter with a series-parallel resonance
AU668103B2 (en) * 1991-08-27 1996-04-26 Lumicae Patent As Frequency-modulated converter with a series-parallel resonance
EP0521229B1 (en) * 1991-10-22 1996-08-14 MECKIND srl Device to display images illuminated from behind, particularly advertising images
FR2693074A1 (en) * 1992-06-26 1993-12-31 Valeo Vision Power supply circuit for car headlight discharge bulb - has micro-programmable unidirectional quasi-resonant switch with high voltage transformer producing smoothed output voltage
EP0936845A1 (en) * 1998-02-10 1999-08-18 STMicroelectronics S.A. Device for lighting and operating a fluorescent lamp
WO2000015013A2 (en) * 1998-09-03 2000-03-16 Electro-Mag International, Inc. Ballast circuit with lamp current regulating circuit
WO2000015013A3 (en) * 1998-09-03 2000-06-02 Electro Mag Int Inc Ballast circuit with lamp current regulating circuit
US6107750A (en) * 1998-09-03 2000-08-22 Electro-Mag International, Inc. Converter/inverter circuit having a single switching element
WO2015104277A1 (en) * 2014-01-13 2015-07-16 Koninklijke Philips N.V. Self-oscillating circuit

Also Published As

Publication number Publication date
ATA188788A (en) 1991-12-15
EP0426738A1 (en) 1991-05-15
AT394917B (en) 1992-07-27

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