WO1996021893A1 - Schaltnetzteil mit einer hilfsschaltung zur speisung eines taktgebers - Google Patents
Schaltnetzteil mit einer hilfsschaltung zur speisung eines taktgebers Download PDFInfo
- Publication number
- WO1996021893A1 WO1996021893A1 PCT/DE1996/000062 DE9600062W WO9621893A1 WO 1996021893 A1 WO1996021893 A1 WO 1996021893A1 DE 9600062 W DE9600062 W DE 9600062W WO 9621893 A1 WO9621893 A1 WO 9621893A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- power supply
- switching power
- transistor
- clock generator
- input voltage
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping 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
Definitions
- the invention relates to a switching power supply for obtaining a regulated output voltage from an unregulated input voltage with a transformer having a primary winding, a secondary winding and an auxiliary winding, the primary winding of which is supplied with a clocked current from the input voltage by means of an electronic switch and a controllable clock generator controlling the electronic switch is and the auxiliary winding is part of the power supply of the clock.
- an auxiliary circuit which is fed from the input voltage and is designed as a constant current switch and is provided, which has a transistor which feeds the clock generator and a divider circuit which is connected upstream of the input voltage and comprises a Zener diode and is connected to the input voltage and includes a resistor.
- a switching power supply of this type is e.g. B. described in DE 40 29 057 AI.
- the transistor is a self-conducting N-channel field-effect transistor, the divider circuit comprising the Z-diode and resistor being connected in series with the load side of the field-effect transistor.
- the invention has for its object to keep the power loss of the switching power supply as low as possible even in the event that the switching power supply is dimensioned for a large range of permissible input voltages.
- the switching power supply can process input voltages in a ratio of 1 to 10.
- the transistor is a field effect transistor, which by a can be blocked by the output of the clock generator when the clock signals are triggered and serves to switch off the transistor.
- the aforementioned divider circuit is connected upstream of the control electrode of the field effect transistor, the Zener diode and the resistor connected upstream of it can be designed for very low power.
- the auxiliary circuit is only operated for an absolutely necessary period of time.
- Amplitude can be detected. It can therefore be achieved by suitable dimensioning of the capacitor which can be charged by the diode that the auxiliary circuit is switched on with a delay in the event of a fault or overload of the output of the switching power supply in order to restart the switching power supply.
- the switching power supply 1 shown schematically simplified in the figure is used to obtain a regulated
- a transformer 2 has a primary winding 3, a secondary winding 4 and an auxiliary winding 5.
- An electronic switch 6 In series with the primary winding 3 is an electronic switch 6, which is controlled by a clock 7.
- An operational amplifier 8 provided on the secondary side of the switched-mode power supply 1 compares the output voltage U 2 with a reference voltage and applies corresponding control signals to the clock generator 7. As a result, the duty cycle of the clock generator 7 to the electronic
- Switch 6 supplied control pulses set.
- An optocoupler 9 is used for the electrical isolation of the operational amplifier 8 on the secondary side of the switching power supply 1 from the clock generator 7 assigned to the primary side.
- the clock generator 7 has its own power supply circuit, which includes 5 additional components in addition to the auxiliary winding already mentioned. As an example, a diode 10 and a charging capacitor 11 are shown. In the stationary operation of the switching power supply 1, the clock 7 is operated by means of this power supply.
- the electronic switch 6 initially remains blocked because the clock generator 7 is not yet supplied from the auxiliary winding 5.
- the auxiliary circuit 12 framed in dashed lines in the figure is designed as a constant current source and is therefore in the Able to gain the operating energy for the clock 7 from very different input voltages U ⁇ . This is done by a field effect transistor 13, which is connected in series with limiting resistors 15 and 16. The control electrode 14 of the field effect transistor 13 is one
- Assigned divider circuit which includes a Z-diode 17 serving as a reference and a resistor 18. This divider circuit is directly connected to the input voltage U 1; can, however, be dimensioned for the very low requirement of the field effect transistor 13 for control energy and therefore works with minimal power loss.
- the auxiliary circuit 12 is automatically switched off.
- a switch-off transistor 20 is used for this purpose, which short-circuits the control electrode 14 of the field-effect transistor 12 as soon as the clock pulses indicated there in the figure appear at the output of the clock generator 7 connected to the electronic switch 6. An undisturbed transition of the operation of the clock generator 7 to the steady-state operation is therefore ensured.
- a series circuit composed of a diode and a resistor is connected upstream of the base of the switch-off transistor 20, a capacitor 21 being chargeable via the diode.
- Circuit bestitr ⁇ Tit which sequence of clock pulses with given amplitude leads to the release of the shutdown transistor 20 and thus to the blocking of the field effect transistor 13.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP96900522A EP0803086A1 (de) | 1995-01-12 | 1996-01-09 | Schaltnetzteil mit einer hilfsschaltung zur speisung eines taktgebers |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19502042.1 | 1995-01-12 | ||
DE1995102042 DE19502042A1 (de) | 1995-01-12 | 1995-01-12 | Schaltnetzteil mit einer Hilfsschaltung zur Speisung eines Taktgebers |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1996021893A1 true WO1996021893A1 (de) | 1996-07-18 |
Family
ID=7752166
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1996/000062 WO1996021893A1 (de) | 1995-01-12 | 1996-01-09 | Schaltnetzteil mit einer hilfsschaltung zur speisung eines taktgebers |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0803086A1 (de) |
CN (1) | CN1168181A (de) |
DE (1) | DE19502042A1 (de) |
WO (1) | WO1996021893A1 (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10043485A1 (de) * | 2000-09-04 | 2002-03-14 | Infineon Technologies Ag | Schaltnetzteil |
DE10132820A1 (de) * | 2001-07-06 | 2003-02-27 | Infineon Technologies Ag | Schaltungsanordnung zur Ansteuerung eines Halbleiterschalters |
US6577643B1 (en) | 1997-10-14 | 2003-06-10 | Lucent Technologies Inc. | Message and communication system in a network |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10018229B4 (de) * | 2000-12-04 | 2005-05-19 | Friwo Gerätebau Gmbh | Verfahren zur Regulierung des Ausgangsstroms und/oder der Ausgangsspannung eines Schaltnetzteils |
JP2004153983A (ja) * | 2002-11-01 | 2004-05-27 | Sharp Corp | スイッチング電源装置 |
CN102014538B (zh) * | 2009-09-17 | 2014-07-09 | 连展科技(深圳)有限公司 | 定电流装置及其应用 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1990010338A1 (en) * | 1989-02-22 | 1990-09-07 | Fanuc Ltd | Circuit for protecting switching regulator |
DE4029057A1 (de) * | 1990-09-13 | 1992-03-19 | Eberle A Gmbh | Anlaufversorgungsspannung fuer primaergetaktete netzteile |
DE4204912A1 (de) * | 1992-02-14 | 1993-08-26 | Siemens Ag | Schaltnetzteil |
DE4310513C1 (de) * | 1993-03-31 | 1994-06-23 | Kloeckner Moeller Gmbh | Schaltungsanordnung zum Überlastschutz für Schaltnetzteile |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DD217378A1 (de) * | 1983-07-04 | 1985-01-09 | Inst Regelungstechnik | Schaltungsanordnung zum starten ruhender umformer mit selbstspeisung ihrer steuerschaltung |
DE3421133A1 (de) * | 1984-06-07 | 1985-12-12 | Philips Patentverwaltung | Schaltungsanordnung zur versorgung der regel- und steuereinrichtung eines geregelten gleichspannungswandlers |
-
1995
- 1995-01-12 DE DE1995102042 patent/DE19502042A1/de not_active Withdrawn
-
1996
- 1996-01-09 WO PCT/DE1996/000062 patent/WO1996021893A1/de not_active Application Discontinuation
- 1996-01-09 EP EP96900522A patent/EP0803086A1/de not_active Withdrawn
- 1996-01-09 CN CN 96191385 patent/CN1168181A/zh active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1990010338A1 (en) * | 1989-02-22 | 1990-09-07 | Fanuc Ltd | Circuit for protecting switching regulator |
DE4029057A1 (de) * | 1990-09-13 | 1992-03-19 | Eberle A Gmbh | Anlaufversorgungsspannung fuer primaergetaktete netzteile |
DE4204912A1 (de) * | 1992-02-14 | 1993-08-26 | Siemens Ag | Schaltnetzteil |
DE4310513C1 (de) * | 1993-03-31 | 1994-06-23 | Kloeckner Moeller Gmbh | Schaltungsanordnung zum Überlastschutz für Schaltnetzteile |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6577643B1 (en) | 1997-10-14 | 2003-06-10 | Lucent Technologies Inc. | Message and communication system in a network |
DE10043485A1 (de) * | 2000-09-04 | 2002-03-14 | Infineon Technologies Ag | Schaltnetzteil |
DE10132820A1 (de) * | 2001-07-06 | 2003-02-27 | Infineon Technologies Ag | Schaltungsanordnung zur Ansteuerung eines Halbleiterschalters |
Also Published As
Publication number | Publication date |
---|---|
EP0803086A1 (de) | 1997-10-29 |
CN1168181A (zh) | 1997-12-17 |
DE19502042A1 (de) | 1996-08-01 |
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