WO2005025040A1 - Selbstschwingender schaltwandler - Google Patents
Selbstschwingender schaltwandler Download PDFInfo
- Publication number
- WO2005025040A1 WO2005025040A1 PCT/AT2004/000270 AT2004000270W WO2005025040A1 WO 2005025040 A1 WO2005025040 A1 WO 2005025040A1 AT 2004000270 W AT2004000270 W AT 2004000270W WO 2005025040 A1 WO2005025040 A1 WO 2005025040A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- switch
- switching
- diode
- converter according
- switching converter
- Prior art date
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
- H02M3/02—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
- H02M3/158—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 including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
-
- 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
Definitions
- the invention relates to a self-oscillating flyback converter.
- Switching converters for supplying electronic devices have become known in a large number, a distinction being made between flyback and forward converters, but mixed types have also become known. Elaborate solutions meet the most diverse requirements with regard to performance, short-circuit resistance, freedom from interference etc.
- the object of the invention is to provide a self-oscillating switching converter, i. H. a switching converter that does not require its own control module, which can be constructed inexpensively with as few components as possible.
- a self-oscillating switching converter in which, according to the invention, an input voltage can be switched to a memory inductance via a first semiconductor switch, the voltage drop of a sensor resistor in series with the switch is supplied as a measure of the current through the inductance of a control electrode of a second semiconductor switch, the input voltage is connected via a resistor to the control electrode of the first switch, this control electrode can be routed to ground via the switching path of the second switch, after the input voltage has been switched on during a first conducting phase for a first period of time of the first switch and a current increase due to the inductance of the second Switch becomes conductive and the first switch opens, whereupon the storage inductance supplies energy to an output capacitor via a rectifier diode until the capacitor ei The switching input of the second switch is charged with the series RC element connecting the input voltage, the second switch opens and the first switch becomes conductive again.
- a flyback converter according to the invention can be constructed with two transistors and an inductor as well as with some resistors and two capacitors. Such a flyback converter is therefore particularly suitable for supplying smaller devices, for example also for supplying the control circuit of a larger switching converter.
- the rectifier diode can galvanically connect the output capacitor to the storage inductor.
- the memory inductance is formed by the primary winding of a transformer, on the secondary winding of which the rectifier diode and the output capacitor are located.
- the choice of the gear ratio of the two inductors gives a larger dimensioning margin in terms of the input and output voltage.
- the capacitor of the RC element can be discharged via a protective resistor and a discharge diode when the first switch is switched on, the protective resistor (Rs) being significantly smaller than the resistance of the RC -Gliedes.
- the control input of the second switch is protected by a reverse polarity protection diode.
- the converter is to be guaranteed to function without a load, it is recommended that the output voltage at the output capacitor be regulated.
- Such regulation can advantageously be carried out in such a way that the switching path of a third semiconductor switch is located parallel to the switching path of the second switch, the control input of which is connected to the output voltage via a Zener diode.
- the switching path of the second switch is bridged by the collector-emitter path of the phototransistor of an optocoupler, the transmitting diode of which is connected to the output voltage via a zener diode.
- Fig. 1 shows the circuit of a switching converter according to the invention with a single memory inductance
- Fig. 2 shows another embodiment of a switching converter according to the invention, which uses a transformer.
- a DC input voltage UE via a storage inductance L1, the collector-emitter path of a transistor T1 and a sensor resistance R2 to ground.
- a resistor R1 leads to the base of the transistor T1 or to the collector of a further transistor T2, the emitter of which is connected to ground.
- the emitter of the first transistor T1 leads the voltage drop across R2 to the base of the second transistor T2, which is connected via the series circuit of a capacitor C1 and a resistor R5 to the connection point of the memory inductor L1 and the collector of the transistor T1.
- This connection point leads via a rectifier diode Dl to an output capacitor C2.
- a third transistor T3 is provided, the collector-emitter path of which is parallel to the collector-emitter path of transistor T2, and the base of which is connected to the output voltage UA via a resistor R6 and a zener diode D4.
- the transistors T1, T2 and T3 are generally controlled semiconductor switches, FETs being preferably used.
- the circuit according to the invention works as follows.
- the DC input voltage UE of, for example, 15 V is applied to the memory inductor L1 and to the resistor R1, which may not exceed the permissible gate-source voltage when using an FET.
- the gate of the transistor T1 is charged via the resistor R1 and this switches on, as a result of which the current in the memory inductor L1 increases linearly.
- the value of this current is mapped to the sensor resistor R2, i. H. the voltage drop across this resistor is a measure of the current through the inductance, and this voltage drop is supplied to the second transistor via the resistor R4. If the second transistor T2 is an npn transistor and the voltage drop across the resistor R2 is greater than the base voltage of this transistor, it becomes conductive and it switches off the transistor T1.
- the inductance L1 tries to maintain the current flow and leads the current via the diode Dl into the output capacitor C2. Via the capacitor Cl and the current limiting resistor R5, the transistor T2 kept conductive and the transistor T1 remains blocked. Only when the capacitor C1 is charged is the transistor T1 released again and the gate newly charged via the resistor R1. This process is repeated until the desired output voltage is reached. Then the described controller intervenes on the basis of the transistor T3 and the Zener diode D4, ie if the output voltage is reached, the transistor T3 is switched on via the Zener diode D4 and the resistor R6 and thus the gate of the transistor T1 is short-circuited. T1 remains switched off until the desired output voltage is undershot again, then the Zener diode D4 no longer conducts and the transistor T1 releases the first transistor T1 again.
- FIG. 2 essentially corresponds, as can be seen immediately by comparison, to the circuit according to FIG. 1. It differs in the following:
- the storage inductance L1 is formed here by the primary coil of a transformer UET, the voltage occurring at the secondary coil L2 again being rectified with the aid of the diode D1 and the output capacitor C2 and leading to the output voltage U A.
- the output voltage UA is regulated by replacing the third transistor T3 in FIG. 1 with the photo transistor of an optocoupler OKO, which is used for electrical isolation from the secondary side.
- the transmission diode of the optocoupler is controlled via a resistor R6 and a zener diode D4, with exactly the same function as described in FIG. 1 resulting in voltage regulation.
- FIG. 2 also shows a protective circuit which consists of the series connection of a protective resistor Rs and a diode D2, which connects the end of the capacitor C1 modified from the memory inductance L1 to the base of the transistor T2. Furthermore, the base-emitter path of this transistor T2 is bridged by a further diode D3.
- This protective circuit is used to not allow the transistor T2 a negative voltage in any operating state and, in addition, to quickly discharge the capacitor C1 in the conductive phase of the first transistor T1.
- the capacitor C1 is discharged with the time constant Cl x R s via the diodes D2 and D3 connected in series, provided that R3 is large compared to R5, so that rapid discharge occurs.
- the capacitor Cl is slowly charged via the resistor R5 with the time constant Cl x R5.
- the time constant uss must be chosen so that there is enough time for the demagnetization of the memory inductor L1 so that it does not carry any current when the transistor T1 is switched on again.
- the time constant Cl x R5 is chosen to be correspondingly lower.
- the diode D3 prevents a negative voltage at the base of the transistor when the transistor T1 is switched on and serves as reverse polarity protection.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/570,934 US7235956B2 (en) | 2003-09-09 | 2004-07-26 | Step up switching converter |
EP04737400A EP1665509A1 (de) | 2003-09-09 | 2004-07-26 | Selbstschwingender schaltwandler |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ATA1423/2003 | 2003-09-09 | ||
AT0142303A AT501799B1 (de) | 2003-09-09 | 2003-09-09 | Hochsetzsteller |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005025040A1 true WO2005025040A1 (de) | 2005-03-17 |
Family
ID=34229717
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AT2004/000270 WO2005025040A1 (de) | 2003-09-09 | 2004-07-26 | Selbstschwingender schaltwandler |
Country Status (5)
Country | Link |
---|---|
US (1) | US7235956B2 (de) |
EP (1) | EP1665509A1 (de) |
CN (1) | CN1849743A (de) |
AT (1) | AT501799B1 (de) |
WO (1) | WO2005025040A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007014449B4 (de) * | 2007-03-27 | 2022-10-06 | Michael Gude | Schalt-Spannungswandler |
EP2262078A1 (de) * | 2009-06-10 | 2010-12-15 | Braun GmbH | Anordnung und Verfahren zur induktiven Energieübertragung |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4999566A (en) * | 1989-06-29 | 1991-03-12 | Robert Bosch Gmbh | Current converter comprising current responsive, self oscillating, switching regulator |
EP0883231A2 (de) * | 1997-06-06 | 1998-12-09 | Canon Kabushiki Kaisha | Stromversorgungsvorrichtung |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3007566A1 (de) * | 1980-02-28 | 1981-09-03 | Siemens AG, 1000 Berlin und 8000 München | Freischwingender sperrwandler |
US4411282A (en) * | 1982-03-15 | 1983-10-25 | W. Braun Company | Mascara applicator wand and receptacle |
FR2633498B1 (fr) * | 1988-06-30 | 1992-03-06 | Oreal | Ensemble applicateur destine au maquillage des cils comportant un pain de mascara et un element de distribution humidifie |
JPH04150767A (ja) * | 1990-10-08 | 1992-05-25 | Fuji Electric Co Ltd | スイッチング電源回路 |
ATE238715T1 (de) * | 1995-03-29 | 2003-05-15 | Estee Lauder Inc | Maskara-applikator |
FR2738125B1 (fr) * | 1995-08-30 | 1998-03-06 | Oreal | Ensemble de conditionnement pour mascara |
FR2786674B1 (fr) * | 1998-12-03 | 2001-01-05 | Oreal | Organe d'application pour l'application d'un produit sur la peau et ensemble ainsi equipe |
JP2001086259A (ja) * | 1999-09-09 | 2001-03-30 | Fujitsu Ltd | 誤接続保護方式 |
US6504733B1 (en) * | 2001-02-27 | 2003-01-07 | Thomson Licensing S.A. | Switch mode power supply |
JP2002315328A (ja) * | 2001-04-12 | 2002-10-25 | Sony Corp | スイッチング電源回路 |
JP3712064B2 (ja) * | 2002-05-08 | 2005-11-02 | セイコーエプソン株式会社 | 出力過電流保護回路、及び該出力過電流保護回路を備えた定電圧スイッチング電源回路 |
-
2003
- 2003-09-09 AT AT0142303A patent/AT501799B1/de not_active IP Right Cessation
-
2004
- 2004-07-26 WO PCT/AT2004/000270 patent/WO2005025040A1/de active Application Filing
- 2004-07-26 EP EP04737400A patent/EP1665509A1/de not_active Withdrawn
- 2004-07-26 CN CNA2004800259792A patent/CN1849743A/zh active Pending
- 2004-07-26 US US10/570,934 patent/US7235956B2/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4999566A (en) * | 1989-06-29 | 1991-03-12 | Robert Bosch Gmbh | Current converter comprising current responsive, self oscillating, switching regulator |
EP0883231A2 (de) * | 1997-06-06 | 1998-12-09 | Canon Kabushiki Kaisha | Stromversorgungsvorrichtung |
Also Published As
Publication number | Publication date |
---|---|
US7235956B2 (en) | 2007-06-26 |
US20070114980A1 (en) | 2007-05-24 |
AT501799A4 (de) | 2006-11-15 |
AT501799B1 (de) | 2006-11-15 |
CN1849743A (zh) | 2006-10-18 |
EP1665509A1 (de) | 2006-06-07 |
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