EP0582263B1 - Regulated power supply for DC voltage - Google Patents
Regulated power supply for DC voltage Download PDFInfo
- Publication number
- EP0582263B1 EP0582263B1 EP93112380A EP93112380A EP0582263B1 EP 0582263 B1 EP0582263 B1 EP 0582263B1 EP 93112380 A EP93112380 A EP 93112380A EP 93112380 A EP93112380 A EP 93112380A EP 0582263 B1 EP0582263 B1 EP 0582263B1
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- EP
- European Patent Office
- Prior art keywords
- capacitor
- voltage
- power supply
- transistor
- supply unit
- 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.)
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/577—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices for plural loads
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
Definitions
- the present invention relates to a stabilized DC power supply according to the preamble of claim 1.
- a generic DC power supply is known from US 3,581,187.
- the desired stabilization of the output voltage is achieved by tapping the output voltage in a control loop, comparing it with a substantially constant voltage and using an operational amplifier or the like to generate a control signal from this voltage difference, which generates the Output voltage itself is affected.
- control principle of the generic power supply is based on a feedback, in which the comparison signal is not independent of the output voltage generated by the power supply.
- the object of the present invention is therefore to simplify a power supply unit of the generic type, in particular to manufacture it in a simpler circuitry and more suitable for large-scale production, and to prevent an adverse reaction of voltage fluctuations at the output of the power supply unit to the stabilization process.
- a second capacitor is charged from the first capacitor as the lower part of a cascade, this being done via the transistor, preferably a field effect transistor.
- the voltage on the second capacitor ie the output voltage of the power supply unit
- the voltage on the second capacitor can thus be stabilized by charging the first capacitor and by the action of the transistor T.
- a "transformer and rectifier” G1 supplies the necessary voltage in the form of half-waves and the required current for a cascade power supply unit 10.
- the power of the rectifier G1 is sufficient to charge a first capacitor C1 to the maximum charging voltage Umax even under full load, which is preferably between 2 to 2/3 times the output voltage Uout.
- the capacitor C1 is thus charged as the upper level of the cascade.
- the duration of the charging is extended due to the large voltage drop across capacitor C1 during a half-wave. Thanks to these conditions, the "transformer and rectifier” G1 is loaded longer, but less heavily. The current flows more homogeneously, and the "transformer and rectifier” G1 can therefore be dimensioned smaller.
- the capacitor C1 has a sufficient capacity so that when the maximum current Imax at the output of the power supply is drawn, the voltage at the capacitor C1 does not drop below a minimum value during the O-passage of the supply voltage. This minimum value is higher than the output voltage of the power supply unit 10.
- the capacitance of the capacitor C1 should not be greater than absolutely necessary so that the voltage fluctuations on the capacitor C1 - which also depend essentially on a resistor R1 - are large at full load; due to these voltage fluctuations, the "transformer and rectifier" G1 is loaded longer and thus more homogeneously at full load. However, the voltage fluctuations must be within the tolerance limit of the selected capacitor type.
- An independent reference voltage Uref is connected to the gate of transistor T. The voltage difference between the reference voltage applied to the gate and the voltage across the second capacitor C2 controls the current of the transistor T for recharging the second capacitor C2.
- the opening of the transistor T is caused by the small voltage drop across the second capacitor C2 with respect to the reference voltage, but not by a feedback to the gate.
- the current of the transistor T is derived as directly as possible from the "transformer and rectifier" G1 - except during the O-passage of the supply voltage, during which it is only taken from the first capacitor C1.
- the voltage at the second capacitor C2 is stabilized in a voltage range which is sufficiently narrow for audio amplifier operation.
- the independent reference voltage Uref is generated by a separate transformer and rectifier G2.
- a stabilized power supply unit is preferably used, since the stability of the output voltage essentially depends on that of the reference voltage. Since the reference voltage at the gate of the transistor T is never heavily loaded, it does not change even under extreme loads (short circuit) at the output of the cascade power supply 10. Therefore, the output voltage returns to the setpoint immediately and without vibrations even after a short-term extreme load.
- the resistor R1 mentioned above has two functions; firstly, it increases the voltage fluctuations on capacitor C1 and secondly, it limits the current through transistor T and prevents its destruction. Too much resistance also increases the power loss and should therefore be avoided. At any time, the possible charging current for the capacitor C2, which is limited by the resistor R1, must be greater than the maximum current required by the power supply 10.
- the second capacitor or output capacitor C2 can be charged from the "transformer and rectifier" G1 and the capacitor C1 via the transistor T. Its capacity buffers short current peaks and high-frequency electricity requirements. This also compensates for the inertia of the control circuit, which can easily lead to phase shifts, at all frequencies. Capacities that are smaller - or equal - than - or else the same as - that of the first capacitor C1 have proven successful; the time (R1 * C1) should be between 0.5 and 5 milliseconds; this causes a high damping factor in audio amplifiers and a great spontaneity of the music.
- the main advantage of the interaction in the cascade of the capacitors C1 and C2 and the transistor T or the FET is that the charge for the output current, in particular at full load, is largely derived directly from the transformer and not, as in conventional power supplies , is temporarily stored in the capacitors C1, C2; the capacitors C1, C2 are only heavily loaded for a short time, in particular during O-passage and rapid load changes, and have buffer properties.
- the capacitors C1, C2 in the cascade power supply unit 10 are therefore also dimensioned much smaller than in conventional power supply units.
- the start-up of the power supply 10 can be slowed down by a capacitor (not shown in the drawing) at the gate of the transistor T (for example to 0.05 to 1 sec). This protects the FET and at the same time increases the stability of the output voltage.
- FIG. 2 shows a circuit with a second resistor R2 and a second transistor T2 and a section for a negative Uout, capacitors C'1, C'2 and resistors R'1, R'2.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Continuous-Control Power Sources That Use Transistors (AREA)
- Amplifiers (AREA)
Description
Die vorliegende Erfindung betrifft ein stabilisiertes Gleichspannungsnetzgerät nach dem Oberbegriff des Patentanspruchs 1. Ein derartiges, gattungsgemäßes Gleichspannungsnetzgerät ist aus der US 3,581,187 bekannt.The present invention relates to a stabilized DC power supply according to the preamble of
Bei einem solchen stabilisierten Gleichspannungsnetzgerät wird die erwünschte Stabilisierung der Ausgangsspannung erreicht, in dem im Wege einer Regelschleife die Ausgangsspannung abgegriffen wird, mit einer im wesentlichen konstanten Spannung verglichen wird und mittels eines Operationsverstärkers od. dgl. aus dieser Spannungsdifferenz ein Regelsignal erzeugt wird, welches die Ausgangsspannung selbst wiederum beeinflußt.In such a stabilized DC power supply, the desired stabilization of the output voltage is achieved by tapping the output voltage in a control loop, comparing it with a substantially constant voltage and using an operational amplifier or the like to generate a control signal from this voltage difference, which generates the Output voltage itself is affected.
Eine solche, aus der genannten US 3,581,187 bekannte Vorrichtung ist allerdings, allein schon durch den notwendigen Komparator und die von diesem gesteuerte, die Ausgangsspannung stellende Treiberstufe zwangsläufig schaltungstechnisch aufwendig und würde insbesondere eine Großserienfertigung des Netzgeräts unter Kostengesichtspunkten erschweren.However, such a device, known from US Pat. No. 3,581,187, is inevitably complex in terms of circuitry, if only because of the necessary comparator and the driver stage which controls the output voltage and controls it, and would in particular make large-scale production of the power supply unit more difficult from a cost point of view.
Ferner basiert das Regelprinzip des gattungsgemäßen Netzgeräts auf einer Rückkopplung, bei welcher das Vergleichssignal nicht unabhängig von der vom Netzgerät erzeugten Ausgangsspannung ist. Daraus ergibt sich aber der Nachteil, daß (unerwünschte) Spannungsschwankungen am Ausgang unmittelbar den Vergleich im Regelkreis beeinflussen, so daß zwangsläufig auch das Vergleichssignal und damit das Steuersignal für die Spannungsstabilisierung nicht völlig entkoppelt sind, was sich entsprechend negativ auf die Güte des (stabilisierten) Ausgangsspannungssignals auswirkt.Furthermore, the control principle of the generic power supply is based on a feedback, in which the comparison signal is not independent of the output voltage generated by the power supply. However, this results in the disadvantage that (undesired) voltage fluctuations at the output directly influence the comparison in the control loop, so that the comparison signal and thus the control signal for voltage stabilization are not necessarily completely decoupled, which has a correspondingly negative effect on the quality of the (stabilized) Output voltage signal affects.
Aufgabe der vorliegenden Erfindung ist es daher, ein Netzgerät der gattungsgemäßen Art zu vereinfachen, insbesondere dieses schaltungstechnisch einfacher und für eine Großserienfertigung besser geeignet herzustellen, und eine nachteilige Rückwirkung von Spannungsschwankungen am Ausgang des Netzgeräts auf den Stabilisierungsvorgang zu verhindern.The object of the present invention is therefore to simplify a power supply unit of the generic type, in particular to manufacture it in a simpler circuitry and more suitable for large-scale production, and to prevent an adverse reaction of voltage fluctuations at the output of the power supply unit to the stabilization process.
Die Aufgabe wird durch das stabilisierte Gleichspannungsnetzgerät mit den Merkmalen des Patentanspruchs 1 gelöst.The object is achieved by the stabilized direct voltage power supply with the features of
Erfindungsgemäß wird vom ersten Kondensator aus ein zweiter Kondensator als unterer Teil einer Kaskade geladen, wobei dies über den Transistor, bevorzugt einen Feldeffekttransistor, erfolgt.According to the invention, a second capacitor is charged from the first capacitor as the lower part of a cascade, this being done via the transistor, preferably a field effect transistor.
Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen beschrieben.Advantageous developments of the invention are described in the subclaims.
Dabei hat es sich als nützlich erwiesen, daß die Spannung am ersten Kondensator signifikant höher ist, als die Ausgangsspannung.It has proven useful that the voltage on the first capacitor is significantly higher than the output voltage.
Erfindungsgemäß ist also die Spannung am zweiten Kondensator (d.h. die Ausgangsspannung des Netzgeräts) durch die Ladung des ersten Kondensators und durch Wirkung des Transistors T stabilisierbar.According to the invention, the voltage on the second capacitor (ie the output voltage of the power supply unit) can thus be stabilized by charging the first capacitor and by the action of the transistor T.
Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung bevorzugter Ausführungsbeispiele sowie anhand der Zeichnung, deren beide Figuren jeweils einen Schaltplan wiedergeben.Further advantages, features and details of the invention result from the following description of preferred exemplary embodiments and from the drawing, the two figures of which each represent a circuit diagram.
Ein "Transformer und Gleichrichter" G1 liefert die notwendige Spannung in Form von Halbwellen und den erforderlichen Strom für ein Kaskaden-Netzgerät 10. Die Leistung des Gleichrichters G1 reicht aus, um auch bei voller Last einen ersten Kondensator C1 auf die maximale Ladespannung Umax aufzuladen, die vorzugsweise zwischen dem 2- bis 2/3-fachen der Ausgangsspannung Uout liegt. Damit wird der Kondensator C1 als oberes Niveau der Kaskade geladen. Bei großer Last wird die Dauer der Aufladung -- bedingt durch den großen Spannungsabfall am Kondensator C1 während einer Halbwelle -- verlängert. Dank dieser Gegebenheiten wird der "Transformer und Gleichrichter" G1 zwar länger belastet, jedoch weniger stark. Der Strom fließt homogener, und der "Transformer und Gleichrichter" G1 kann deshalb kleiner dimensioniert werden.A "transformer and rectifier" G1 supplies the necessary voltage in the form of half-waves and the required current for a cascade
Der Kondensator C1 hat eine ausreichende Kapazität, um bei Entnahme des maximalen Stromes Imax am Ausgang des Netzgerätes die Spannung am Kondensator C1 während des O-Durchganges der Speisespannung nicht unter einen Minimalwert abfallen zu lassen. Dieser Minimalwert liegt höher als die Ausgangsspannung des Netzgerätes 10. Die Kapazität des Kondensators C1 soll nicht größer sein als unbedingt notwendig, damit die Spannungsschwankungen am Kondensator C1 -- die auch wesentlich von einem Widerstand R1 abhängen -- bei voller Last groß sind; durch diese Spannungsschwankungen wird bei voller Last der "Transformer und Gleichrichter" G1 länger und somit homogener belastet. Die Spannungsschwankungen müssen aber innerhalb der Toleranzgrenze des gewählten Kondensatortyps liegen.The capacitor C1 has a sufficient capacity so that when the maximum current Imax at the output of the power supply is drawn, the voltage at the capacitor C1 does not drop below a minimum value during the O-passage of the supply voltage. This minimum value is higher than the output voltage of the
Ein Transistor T (Kaskade), vorzugsweise ein Feldeffekt-Transistor FET, dessen Gate durch eine dünne Oxidschicht gegen den Stromkanal isoliert ist (MOS-FET = metal-oxid-silicon), kontrolliert die Ladung und damit die Spannung an einem zweiten Kondensator C2 (unterer Teil der Kaskade). Am Gate des Transistors T ist eine unabhängige Referenzspannung Uref angeschlossen. Die Spannungdifferenz zwischen der am Gate angelegten Referenzspannung und der Spannung am zweiten Kondensator C2 steuert den Strom des Transistors T für das Nachladen des zweiten Kondensators C2. Die Öffnung des Transistors T entsteht durch den kleinen Spannungsabfall am zweiten Kondensator C2 bezüglich der Referenzspannung, nicht aber durch eine Rückkoppelung zum Gate. Der Strom des Transistors T wird möglichst direkt aus dem "Transformer und Gleichrichter" G1 abgeleitet - ausgenommen während des O-Durchganges der Speisespannung, während dessen er einzig aus dem ersten Kondensator C1 entnommen wird. Im Rahmen der Empfindlichkeit des gewählten Transistors T, vorzugsweise des FET, wird die Spannung am zweiten Kondensator C2 in einem für den Audioverstärkerbetrieb ausreichend engen Spannungsbereich stabilisert.A transistor T (cascade), preferably a field effect transistor FET, the gate of which is insulated from the current channel by a thin oxide layer (MOS-FET = metal-oxide-silicon), controls the charge and thus the voltage across a second capacitor C2 ( lower part of the cascade). An independent reference voltage Uref is connected to the gate of transistor T. The voltage difference between the reference voltage applied to the gate and the voltage across the second capacitor C2 controls the current of the transistor T for recharging the second capacitor C2. The opening of the transistor T is caused by the small voltage drop across the second capacitor C2 with respect to the reference voltage, but not by a feedback to the gate. The current of the transistor T is derived as directly as possible from the "transformer and rectifier" G1 - except during the O-passage of the supply voltage, during which it is only taken from the first capacitor C1. In the context of the sensitivity of the selected transistor T, preferably the FET, the voltage at the second capacitor C2 is stabilized in a voltage range which is sufficiently narrow for audio amplifier operation.
Die unabhängige Referenzspannung Uref wird von einem gesonderten Transformer und Gleichrichter G2 generiert. Vorzugsweise wird ein stabilisiertes Netzgerät verwendet, da die Stabilität der Ausgangsspannung wesentlich von derjenigen der Referenzspannung abhängt. Da die Referenzspannung am Gate des Transistors T nie stark belastet wird, ändert sie sich auch bei extremen Lasten (Kurzschluß) am Ausgang des KaskadenNetzgerätes 10 nicht. Daher kehrt die Ausgangsspannung auch nach kurzfrist extremer Last sofort und ohne Schwingungen zum Sollwert zurück.The independent reference voltage Uref is generated by a separate transformer and rectifier G2. A stabilized power supply unit is preferably used, since the stability of the output voltage essentially depends on that of the reference voltage. Since the reference voltage at the gate of the transistor T is never heavily loaded, it does not change even under extreme loads (short circuit) at the output of the
Der oben erwähnte Widerstand R1 hat zwei Aufgaben; erstens vergrößert er die Spannungsschwankungen am Kondensator C1 und zweitens limitiert er den Strom durch den Transistor T und verhindert dessen Zerstörung. Ein zu großer Widerstand vergrößert auch die Verlustleistung und ist deshalb zu vermeiden. Jederzeit muß der mögliche Ladestrom für den Kondensator C2, der durch den Widerstand R1 begrenzt ist, größer sein als der maximale Strom, der vom Netzteil 10 verlangt wird.The resistor R1 mentioned above has two functions; firstly, it increases the voltage fluctuations on capacitor C1 and secondly, it limits the current through transistor T and prevents its destruction. Too much resistance also increases the power loss and should therefore be avoided. At any time, the possible charging current for the capacitor C2, which is limited by the resistor R1, must be greater than the maximum current required by the
Der zweite Kondensator oder Ausgangs-Kondensator C2 ist aus dem "Transformer und Gleichrichter" G1 und dem Kondensor C1 über den Transistor T ladbar. Seine Kapazität puffert kurze Stromspitzen sowie hochfrequenten Strombedarf ab. Damit wird auch die Trägheit der Regelschaltung, die leicht zu Phasenverschiebungen führen kann, bei allen Frequenzen aufgefangen. Bewährt haben sich Kapazitäten, die kleiner -- oder gleich --sind als -- oder aber gleich wie -- die des ersten Kondensators C1, die Zeit (R1*C1) sollte zwischen 0,5 und 5 Millisekunden liegen; dies bewirkt einen hohen Dämpungsfaktor in Audio-Verstärkern und eine große Spontaneität der Musik.The second capacitor or output capacitor C2 can be charged from the "transformer and rectifier" G1 and the capacitor C1 via the transistor T. Its capacity buffers short current peaks and high-frequency electricity requirements. This also compensates for the inertia of the control circuit, which can easily lead to phase shifts, at all frequencies. Capacities that are smaller - or equal - than - or else the same as - that of the first capacitor C1 have proven successful; the time (R1 * C1) should be between 0.5 and 5 milliseconds; this causes a high damping factor in audio amplifiers and a great spontaneity of the music.
Der wesentliche Vorteil des Zusammenspiels in der Kaskade der Kondensatoren C1 und C2 und des Transistors T bzw. des FET liegt darin, daß die Ladung für den Ausgangsstrom, insbesondere bei voller Last, weitgehend direkt vom Transformer her abgeleitet wird und nicht, wie in herkömmlichen Netzgeräten, in den Kondensatoren C1,C2 zwischengespeichert wird; die Kondensatoren C1,C2 werden nur kurzzeitig, inbesondere beim O-Durchgang und bei schnellen Laständerungen, stark belastet und haben Puffereigenschaften. Daher sind die Kondensatoren C1,C2 im Kaskaden-Netzgerät 10 auch viel kleiner dimensioniert als in herkömmlichen Netzgeräten.The main advantage of the interaction in the cascade of the capacitors C1 and C2 and the transistor T or the FET is that the charge for the output current, in particular at full load, is largely derived directly from the transformer and not, as in conventional power supplies , is temporarily stored in the capacitors C1, C2; the capacitors C1, C2 are only heavily loaded for a short time, in particular during O-passage and rapid load changes, and have buffer properties. The capacitors C1, C2 in the cascade
Das Aufstarten des Netzgerätes 10 kann durch einen in der Zeichnung nicht dargestellten Kondensator am Gate des Transistors T verlangsamt werden (z. B. auf 0,05 bis 1 sec). Damit werden die FET geschützt, und gleichzeitig wird die Stabilität der Ausgangsspannung erhöht.The start-up of the
Mit der vorstehend beschriebenen Art der Stabilisierung bzw. Siebung kann bei 10 A Belastung eine Stabilität erhalten werden, die besser als +- 0,1 Volt auf 20 Volt Ausgangsspannung ist.With the type of stabilization or screening described above, a stability can be obtained at 10 A load, which is better than + - 0.1 volts to 20 volts output voltage.
Das erfindungsgemäße Ausführungsbeispiel der Fig. 2 zeigt eine Schaltung mit einem zweiten Widerstand R2 und einem zweiten Transistor T2 sowie einen Abschnitt für eine negative Uout, Kondensatoren C'1, C'2 und Widerständen R'1, R'2.2 shows a circuit with a second resistor R2 and a second transistor T2 and a section for a negative Uout, capacitors C'1, C'2 and resistors R'1, R'2.
Claims (7)
- Stabilised DC power supply unit for use with audio equipment, comprising a first capacitor (C1) which is connected between the output terminals of a rectifier (G1), a second capacitor (C2) which is connected between the output terminals of the power supply unit and a transistor (T) which is connected between a first terminal of the first capacitor (C1) and a first terminal of the second capacitor (C2) in such a manner that the two first terminals are connected together when the transistor (T) is connected through, characterised in that the respective second terminals of the first (C1) and second (C2) capacitors are directly connected together and a gate terminal of the transistor is connected for the application of a reference voltage which is generated independently of an output voltage (Uout) tapped off via the second capacitor (C2).
- DC power supply unit according to claim 1, characterised in that the reference voltage is a stabilised constant voltage.
- DC power supply unit according to claim 1 or claim 2, characterised in that the dimensions of the capacitors (C1, C2) and the transistor (T) are such that a current is controlled by the transistor between the first terminals in response to the voltage difference between the reference voltage and the output voltage.
- DC power supply unit according to one of claims 1 to 3, characterised by a resistor (R1) connected into the path between the first terminals of the first (C1) and second (C2) capacitors and the transistor (T).
- DC power supply unit according to claim 4, characterised in that the resistor (R1) is connected to the first terminal of the first capacitor (C1) and the time constant (C1 x R1) of the first capacitor (C1) with the resistor (R1) is between 0.5 and 5 msec.
- DC power supply unit according to one of claims 1 to 5, characterised in that the dimensions of the rectifier (G1) are such that it can charge the first capacitor (C1) to a voltage (Umax) which is 2- to 3/2 times the output voltage (Uout).
- DC power supply unit according to one of claims 1 to 6, characterised by a capacitor connected between the reference voltage and the gate terminal of the transistor (T).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4226022 | 1992-08-06 | ||
| DE4226022 | 1992-08-06 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0582263A1 EP0582263A1 (en) | 1994-02-09 |
| EP0582263B1 true EP0582263B1 (en) | 1996-06-05 |
Family
ID=6464984
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP93112380A Revoked EP0582263B1 (en) | 1992-08-06 | 1993-08-03 | Regulated power supply for DC voltage |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0582263B1 (en) |
| DE (1) | DE59302801D1 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1270158B (en) * | 1961-04-19 | 1968-06-12 | Fritz Hellige & Co G M B H Fab | Circuit for stabilizing a supply voltage with protection against inrush current peaks |
| US3581187A (en) * | 1969-06-23 | 1971-05-25 | Metrodynamics Corp | Regulated dc power supply |
| EP0399598A3 (en) * | 1989-05-22 | 1991-03-06 | Koninklijke Philips Electronics N.V. | A.c. to d.c. converter |
| DE4019637C1 (en) * | 1990-06-20 | 1991-08-08 | Loewe Opta Gmbh, 8640 Kronach, De | Current supply circuit for LF amplifier of radio receiver - has two rectifying circuits for two sec. windings of mains transformer combinable by switch for higher output power |
-
1993
- 1993-08-03 EP EP93112380A patent/EP0582263B1/en not_active Revoked
- 1993-08-03 DE DE59302801T patent/DE59302801D1/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| EP0582263A1 (en) | 1994-02-09 |
| DE59302801D1 (en) | 1996-07-11 |
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