DE2536207B1 - Transistor flow converters with several separate output circuits - Google Patents
Transistor flow converters with several separate output circuitsInfo
- Publication number
- DE2536207B1 DE2536207B1 DE19752536207 DE2536207A DE2536207B1 DE 2536207 B1 DE2536207 B1 DE 2536207B1 DE 19752536207 DE19752536207 DE 19752536207 DE 2536207 A DE2536207 A DE 2536207A DE 2536207 B1 DE2536207 B1 DE 2536207B1
- Authority
- DE
- Germany
- Prior art keywords
- converter
- voltage
- output
- transistor
- flyback converter
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
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
- 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
- H02M3/3385—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 with automatic control of output voltage or current
Description
Der Schalttransistor T1 des Sperrumrichters kann erst einschalten, wenn an der Klemme A eine positive Spannung erscheint. Dies ist immer dann der Fall, wenn der Transformator Tr des Durchflußumrichters über den Schalttransistor T an die Eingangsspannung U geschaltet ist. The switching transistor T1 of the flyback converter can only switch on when if a positive voltage appears at terminal A. This is always the case if the transformer Tr of the flow converter via the switching transistor T is connected to the input voltage U.
Die Schaltung des Sperrumrichters SU wird anhand der F i g. 2 beschrieben. The circuit of the flyback converter SU is shown in FIG. 2 described.
Die wesentlichen Schaltungsteile des Sperrumrichters sind ein Schalttransistor T1, der Schwingtransformator Tr 1 mit der Primärwicklung a, der Rückkopplungswicklung b im Basisstromkreis des Schalttransistors und der Sekundärwicklung c mit der Diode D 2 und dem Glättungskondensator C 11. Zur Regelung der Ausgangsspannung wird in einem Spannungsteiler R 2, R3, R4, der den Ausgangsklemmen D, E parallel geschaltet ist eine der Ausgangsspannung proportionale Meßspannung abgegriffen und im Steuerkreis eines Regeltransistors T3 mit einer an einer Z-Diode Z1 erzeugten Referenzspannung verglichen. Der Regelverstärker steuert einen Treibertransistor T2, dessen Emitter-Kollektor-Strecke mit der Rückkopplungswicklung b im Basis-Emitter-Kreis des Schalttransistors T1 in Reihe geschaltet ist Der Basisstrom für den Treibertransistor T2 und den Schalttransistor T1 wird vom Durchflußumrichter über das LC-Sieb L 1, C1, die Klemme B und den Widerstand R 1 geliefert. Bei leitendem Schalttransistor T1 liegt die Eingangsspannung an der Übertragerwicklung a Die in der Rückkopplungswicklung b des Transformators induzierte Spannung treibt einen Kollektorstrom über den Transistor T2, der den Schalttransistor T1 durchschaltet. Der Kollektorstrom des Schalttransistors steigt wegen der konstanten Induktivität des Transformators linear an, bis die Stromverstärkung des Schalttransistors T1 ein weiteres Ansteigen verhindert. Der Schalttransistor T1 nimmt dann Spannung auf und schaltet den Strom ab. Die Spannung an der Induktivität polt um und gibt die magnetische Energie an den Verbraucherkreis ab, d.h., es fließt Strom über die Diode D2 in den Ladekondensator Cli und den Meßspannungsteiler R2, R3, R 4. Der Regeltransistor T3 vergleicht die Spannung am Kondensator Cli mit der Referenzspannung der Zenerdiode Z1. Wird die Spannung am Kondensator C 11 (Ausgangsspannung) zu groß, so fließt über den Regeltransistor T3 ein Teil des Basisstromes des Treibertransistors T2 ab. Der Scheitelwert des Kollektorstromes durch den Schalttransistor T1 wird während der nächsten Durchlaßphase kleiner sein und damit auch die aufgenommene Energie. The main circuit parts of the flyback converter are a switching transistor T1, the oscillating transformer Tr 1 with the primary winding a, the feedback winding b in the base circuit of the switching transistor and the secondary winding c with the diode D 2 and the smoothing capacitor C 11. To regulate the output voltage, in a voltage divider R 2, R3, R4 connected to the output terminals D, E in parallel a measuring voltage proportional to the output voltage is tapped and in the control circuit a control transistor T3 with a reference voltage generated at a Zener diode Z1 compared. The control amplifier controls a driver transistor T2, its emitter-collector path with the feedback winding b in the base-emitter circuit of the switching transistor T1 The base current for the driver transistor T2 and the switching transistor is connected in series T1 is from the flow converter via the LC sieve L 1, C1, the terminal B and the resistor R 1 delivered. When the switching transistor T1 is conductive, the input voltage is at the Transformer winding a The induced in the feedback winding b of the transformer Voltage drives a collector current through transistor T2, which is the switching transistor T1 switches through. The collector current of the switching transistor increases because of the constant The inductance of the transformer increases linearly until the current gain of the switching transistor T1 prevents a further increase. The switching transistor T1 then takes voltage and turns off the power. The voltage at the inductance reverses and gives the magnetic energy is transferred to the consumer circuit, i.e. current flows through the Diode D2 in the charging capacitor Cli and the measuring voltage divider R2, R3, R 4. The Control transistor T3 compares the voltage across the capacitor Cli with the reference voltage the zener diode Z1. If the voltage on capacitor C 11 (output voltage) becomes too high, part of the base current of the driver transistor flows through the control transistor T3 T2 from. The peak value of the collector current through the switching transistor T1 is be smaller during the next transmission phase and thus also the recorded Energy.
Die Sperrung des Schalttransistors T 1 wird durch eine Hilfsschaltung bewirkt, die aus einem Spannungsteiler R 5, R 6 und einem als Schalter arbeitenden, vom Spannungsteiler gesteuerten Transistor T4 besteht. The blocking of the switching transistor T 1 is through an auxiliary circuit causes, which consists of a voltage divider R 5, R 6 and one working as a switch, the voltage divider controlled transistor T4 consists.
Dadurch soll verhindert werden, daß der Schalttransistor T1 bei Teillasten mehrmals je Periode einschaltet, wenn die Abmagnetisierung des Transformators Tr 1 bereits beendet ist und die positive Spannung am Anschluß A noch anliegt. Der Transistor T4 wird durch den Spannungsteiler R 5, R 6 leitend geschaltet, sobald der Schalttransistor T1 sperrt. Für den Rest der Zeit, in der die positive Spannung noch anliegt, entsteht an der Basis von T1 eine negative Sperrspannung, die ein wiederholtes Einschalten unterdrückt. Der Spannungsteiler R5, R 6 liegt parallel zu einer Reihenschaltung, bestehend aus der Emitter-Kollektor-Strecke des Schalttransistors T1 und dem Kondensator C11, der die Ausgangsspannung führt. Sein Abgriff ist mit der Basis des Transistors T4 verbunden. Im leitenden Zustand des Transistors T4 treibt die Ausgangsspannung am Kondensator Cli einen Strom über die Dioden D4 und D5, die jeweils der Emitter-Basis-Strecke des Schalt- und des Treibertransistors Tl, T2 mit solcher Polung parallel geschaltet sind, daß an beiden Steuerstrecken eine definierte Sperrspannung entsteht. Diese Sperrspannung wird erst aufgehoben, wenn die positive Spannung an der Klemme A bei Beendigung der leitenden Phase des Schalttransistors T des Durchflußumrichters entfällt Durch Wegfall der Kollektor-Emitter-Spannung von T1 wird der Transistor T4 nichtleitend. Bei Wiederkehr der Spannung.an der Klemme A wird der Schalttransistor T 1 wieder leitend.This is to prevent the switching transistor T1 from being exposed to partial loads switches on several times per period when the demagnetization of the transformer Tr 1 has already ended and the positive voltage at terminal A is still present. Of the Transistor T4 is switched on by the voltage divider R 5, R 6 as soon as the switching transistor T1 blocks. For the rest of the time the positive tension is still applied, a negative reverse voltage is created at the base of T1, which is a repeated switching on suppressed. The voltage divider R5, R 6 is parallel to a series circuit, consisting of the emitter-collector path of the switching transistor T1 and the capacitor C11, which carries the output voltage. His tap is with connected to the base of transistor T4. In the conductive state of the transistor T4 the output voltage at the capacitor Cli drives a current through the diodes D4 and D5, each of the emitter-base path of the switching transistor and the driver transistor Tl, T2 are connected in parallel with such a polarity that on both control paths a defined reverse voltage is created. This reverse voltage is only removed, when the positive voltage at terminal A at the end of the conductive phase of the Switching transistor T of the flow converter is omitted due to the absence of the collector-emitter voltage from T1 the transistor T4 becomes non-conductive. When the voltage returns at the terminal A, the switching transistor T 1 becomes conductive again.
Der Transformator Tr 1 des Sperrumrichters nimmt während der Einschaltzeit von T1 magnetische Energie 2 2 L F auf und gibt sie in der Ausschaltzeit über den Gleichrichter D2 an den Ladekondensator Cli ab, dem über die gesamte Periode die Verbraucherleistung w entnommen wird. Der Regeltransistor T3 steuert abhängig von der Verbraucherleitung die Energieaufnahme. The transformer Tr 1 of the flyback converter increases during the switch-on time from T1 magnetic energy 2 2 L F and releases it during the switch-off time via the Rectifier D2 to the charging capacitor Cli, which over the entire period the Consumer power w is taken. The control transistor T3 controls depending on the power consumption of the consumer line.
Da die Schaltfrequenz des Durchflußumrichters konstant ist und der Tastgrad sich umgekehrt proportional mit der Speisespannung U ändert, wird dem Sperrumrichter pro Periode immer die gleiche Spannungszeitfläche für die Energieaufnahme angeboten, die bei Nennlast theoretisch voll ausgenützt werden kann. Since the switching frequency of the flow converter is constant and the The duty cycle changes inversely proportional to the supply voltage U, the blocking converter The same voltage time area is always offered for energy consumption per period, which can theoretically be fully utilized at nominal load.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19752536207 DE2536207C2 (en) | 1975-08-13 | Transistor forward converter with several separate output circuits |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19752536207 DE2536207C2 (en) | 1975-08-13 | Transistor forward converter with several separate output circuits |
Publications (2)
Publication Number | Publication Date |
---|---|
DE2536207B1 true DE2536207B1 (en) | 1976-12-09 |
DE2536207C2 DE2536207C2 (en) | 1977-07-28 |
Family
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3024721A1 (en) * | 1980-06-30 | 1982-01-21 | Siemens AG, 1000 Berlin und 8000 München | Multiple output DC power supply - has one regulated voltage output and other outputs voltage limited by passive components |
EP0105541A3 (en) * | 1982-09-06 | 1986-02-05 | N.V. Nederlandsche Apparatenfabriek Nedap | A dc-to-ac voltage converter having galvanically separated input and output(s) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3024721A1 (en) * | 1980-06-30 | 1982-01-21 | Siemens AG, 1000 Berlin und 8000 München | Multiple output DC power supply - has one regulated voltage output and other outputs voltage limited by passive components |
EP0105541A3 (en) * | 1982-09-06 | 1986-02-05 | N.V. Nederlandsche Apparatenfabriek Nedap | A dc-to-ac voltage converter having galvanically separated input and output(s) |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
E77 | Valid patent as to the heymanns-index 1977 | ||
8339 | Ceased/non-payment of the annual fee |