EP0325147B1 - Circuit arrangement for a voltage-controlled constant voltage source with an input side rc network - Google Patents
Circuit arrangement for a voltage-controlled constant voltage source with an input side rc network Download PDFInfo
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- EP0325147B1 EP0325147B1 EP89100348A EP89100348A EP0325147B1 EP 0325147 B1 EP0325147 B1 EP 0325147B1 EP 89100348 A EP89100348 A EP 89100348A EP 89100348 A EP89100348 A EP 89100348A EP 0325147 B1 EP0325147 B1 EP 0325147B1
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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
- G05F1/468—Regulating voltage or current wherein the variable actually regulated by the final control device is dc characterised by reference voltage circuitry, e.g. soft start, remote shutdown
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- the invention relates to a circuit arrangement for a voltage-controlled constant voltage source, which on the input side has an RC element, which serves for a delay effect and / or interference suppression and / or noise suppression by means of filtering, with a first resistor in the series path between an input of the constant voltage source and a first supplying a reference voltage Terminal and a capacitor is arranged in the transverse branch, and the input is additionally connected to a second resistor and via this and via a diode arranged in series with it to a second terminal, via which such different voltages can be supplied through which the diode in Passage direction or in the blocking direction can be claimed, with stress in the forward direction a control voltage supplied via the second terminal compared to the reference voltage supplied via the first terminal due to the resistance effect of the Resistance of the R-C element in the voltage-controlled constant current source largely penetrated.
- a reference voltage is thus supplied to the input of the constant voltage source via an RC element which serves one or more of the stated purposes.
- the output voltage of the voltage-controlled constant voltage source may, for example, be fed to a regulator.
- the voltage-controlled constant voltage source is connected between the same and the RC element. This can be designed as an operational amplifier.
- the terms “voltage follower” and “impedance converter” are also used in this context.
- a voltage-controlled constant voltage source delivers - within certain limits, of course!
- the reverse current flowing through the diode in the off state and flowing off via the second and the first resistor (resistance of the RC element) produces a voltage drop on the latter , whereby the effective voltage at the input of the constant voltage source is changed. Since, in addition, the reverse current of the diode is very temperature-dependent, there is also a strong temperature dependency for the effect of influencing the voltage that is currently effective at the input of the constant voltage source.
- the object of the invention is to eliminate the influence of the diode reverse current in a circuit arrangement of the type specified at the outset with as little effort as possible, and to eliminate the temperature dependency shown.
- the invention solves the problem in that the connection point between the second resistor and the diode is connected via a third resistor to the output of the constant voltage source, via which, when the diode is used in the reverse direction, a reverse current flowing through it through the effect of the resistance value derived from the second resistor significantly lower resistance value of the third resistor and thus an influence on the constant voltage source largely prevented, that is made practically ineffective.
- a controller (not shown) is connected on the output side via an output terminal B.
- the voltage-controlled constant voltage source is designed in a manner known per se. In this context, reference should be made to the terms “operational amplifier”, “voltage follower” and “impedance converter”.
- a voltage-controlled constant voltage source delivers - as its name suggests - regardless of the flowing output current - within certain limits, of course, based on this output current - an output voltage that is also constant at a constant input voltage, the output voltage being the same as the input voltage. By applying a certain input voltage, the output voltage can be dictated.
- a reference voltage can be supplied via a first input terminal A, which should normally serve to determine the input voltage for the voltage-controlled constant voltage source N.
- An R-C element is connected between said first input terminal A and input G of the constant voltage source, the resistor R1 of which lies in the longitudinal branch and the capacitor C1 of which lies in the transverse branch.
- the R-C element can serve a delay effect and / or a noise suppression and / or a noise suppression by means of filtering.
- the reference voltage UA therefore normally serves to control the constant voltage source N via its input G.
- the voltage UC at this input is equal to the capacitor voltage.
- a second input-side terminal E is also provided.
- a higher-level switching device for example a higher-level controller, may have an option to intervene in the voltage UC, which is used directly to control the constant voltage source.
- the voltage at the terminal E is higher, that is, it is more positive than the voltage at the input G.
- the diode V is stressed in the reverse direction. Only if the voltage at terminal E becomes lower than that Voltage at input G, the voltage at terminal E determines the voltage at input G. In this special case, which deviates from the normal case, the voltage at terminal E largely prevails over the reference voltage and thus significantly influences the output voltage of the constant voltage source.
- the resistance value of the resistor R1 is initially defined in such a way that the aforementioned delay effect and / or interference suppression and / or noise suppression is or are ensured by means of filtering.
- the resistance value of the resistor R2 is therefore chosen to be correspondingly smaller than the resistance value of the resistor R1.
- the resistor R3 is provided, which, according to the drawing, connects the output of the constant voltage source N to the connection point between the resistor R2 and the diode V.
- the resistance value of this resistor R3 may be chosen to be substantially lower than the resistance value of the resistor R2.
- the resistance value of the resistor R3 can be chosen to be significantly lower than the resistance value of the resistor R2; because the resistance value of the resistor R3 has practically no influence on the voltage at the input G of the constant voltage source N, because exactly or almost exactly the same voltage is present at the input and at the output of the constant voltage source.
- the resistor R3 represents a low-impedance path for the reverse current flowing through the diode V, so that the vast majority of this reverse current can flow off via the resistor R3 and only a negligible part via the resistors R2 and R1.
- resistor R3 or in addition to this one to provide further diode D, which is connected in the manner shown in the drawing so that it is current-permeable to the reverse current mentioned. It can therefore be provided instead of the resistor R3, but can also be provided in parallel with the resistor R3.
- a diode would have to be selected which causes a very low voltage drop in the forward direction when the reverse current of the diode V flows through it in the forward direction.
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Abstract
Description
Die Erfindung bezieht sich auf eine Schaltungsanordnung für eine spannungsgesteuerte Kontantspannungsquelle, der eingangsseitig ein einer Verzögerungswirkung und/oder einer Störimpulsunterdrückung und/oder einer Rauschunterdrückung mittels Filterung dienendes R-C-Glied mit einem ersten Widerstand im Längszweig zwischen einem Eingang der Konstantspannungsquelle und einer eine Referenzspannung zuführenden ersten Klemme sowie mit einem Kondensator im Querzweig vorgeordnet ist, und deren Eingang zusätzlich mit einem zweiten Widerstand und über diesen und über eine zu ihm in Reihe angeordnete Diode mit einer zweiten Klemme verbunden ist, über die solche verschiedenen Spannungen zuführbar sind, durch die die Diode in Durchlaßrichtung bzw. in Sperrichtung beanspruchbar ist, wobei bei Beanspruchung in Durchlaßrichtung eine über die zweite Klemme zugeführte Steuerspannung sich gegenüber der über die erste Klemme zugeführten Referenzspannung aufgrund der Widerstandswirkung des Widerstandes des R-C-Gliedes bei der spannungsgesteuerten Konstantstromquelle weitgehend durchsetzt.The invention relates to a circuit arrangement for a voltage-controlled constant voltage source, which on the input side has an RC element, which serves for a delay effect and / or interference suppression and / or noise suppression by means of filtering, with a first resistor in the series path between an input of the constant voltage source and a first supplying a reference voltage Terminal and a capacitor is arranged in the transverse branch, and the input is additionally connected to a second resistor and via this and via a diode arranged in series with it to a second terminal, via which such different voltages can be supplied through which the diode in Passage direction or in the blocking direction can be claimed, with stress in the forward direction a control voltage supplied via the second terminal compared to the reference voltage supplied via the first terminal due to the resistance effect of the Resistance of the R-C element in the voltage-controlled constant current source largely penetrated.
In einer Schaltungsanordnung der zuvor angegebenen, als bekannt vorausgesetzten Art wird eine Referenzspannung dem Eingang der Konstantspannungsquelle also über ein R-C-Glied zugeführt, das einem oder mehreren der angegebenen Zwecke dient. Die Ausgangsspannung der spannungsgesteuerten Konstantspannungsquelle möge z.B. einem Regler zugeführt werden. Um das R-C-Glied durch den Regler o.dgl. nicht zu belasten, ist zwischen demselben und das R-C-Glied die spannungsgesteuerte Konstantspannungsquelle geschaltet. Eine solche kann als Operationsverstärker ausgebildet sein. In diesem Zusammenhang werden auch die Bezeichnungen "Spannungsfolger" und "Impedanzwandler" verwendet. Eine spannungsgesteuerte Konstantspannungsquelle liefert also - in bestimmten Grenzen natürlich! - unabhängig vom jeweils fließenden Ausgangsstrom eine Ausgangsspannung, die bei konstanter Eingangsspannung ebenfalls konstant ist, wobei die Ausgangsspannung der Eingangsspannung gleich ist und mit Hilfe der Eingangsspannung die Ausgangsspannung diktiert wird; der Ausgang der Konstantspannungsquelle ist also extrem niederohmig. - Über die genannte zweite Klemme möge nun ein übergeordnetes Schaltorgan, z.B. ein übergeordneter Regler eine Eingriffsmöglichkeit auf die am Eingang der Konstantspannungsquelle wirksame Regelspannung haben. Dabei liegt im Normalbetrieb die Spannung an der zweiten Klemme auf einem Wert, durch den die Diode in Sperrichtung beansprucht wird. Die zweite Klemme ist somit durch die genannte Diode vom übrigen Netzwerk entkoppelt. Da es sinnvoll ist, das Netzwerk relativ hochohmig auszulegen, erzeugt in einer Schaltungsanordnung der eingangs genannten Art der durch die Diode im Sperrzustand fließende Sperrstrom, der über den zweiten und den ersten Widerstand (Widerstand des R-C-Gliedes) abfließt, an dem letzteren einen Spannungsabfall, wodurch die am Eingang der Konstantspannungsquelle wirksame Spannung verändert wird. Da zudem der Sperrstrom der Diode sehr temperaturabhängig ist, ergibt sich auch für den aufgezeigten Effekt der Beeinflussung der am Eingang der Konstantspannungsquelle jeweils gerade wirksamen Spannung eine starke Temperaturabhängigkeit.In a circuit arrangement of the type specified above, which is assumed to be known, a reference voltage is thus supplied to the input of the constant voltage source via an RC element which serves one or more of the stated purposes. The output voltage of the voltage-controlled constant voltage source may, for example, be fed to a regulator. To the RC element by the controller or the like. not to load, the voltage-controlled constant voltage source is connected between the same and the RC element. This can be designed as an operational amplifier. The terms "voltage follower" and "impedance converter" are also used in this context. A voltage-controlled constant voltage source delivers - within certain limits, of course! - Independent of the respective flowing output current Output voltage, which is also constant when the input voltage is constant, the output voltage being equal to the input voltage and the output voltage being dictated with the aid of the input voltage; the output of the constant voltage source is extremely low. - Via the above-mentioned second terminal, a higher-level switching element, for example a higher-level controller, may now be able to intervene on the control voltage effective at the input of the constant voltage source. In normal operation, the voltage at the second terminal is at a value by which the diode is reverse-loaded. The second terminal is thus decoupled from the rest of the network by the said diode. Since it makes sense to design the network to be relatively high-impedance, in a circuit arrangement of the type mentioned at the outset, the reverse current flowing through the diode in the off state and flowing off via the second and the first resistor (resistance of the RC element) produces a voltage drop on the latter , whereby the effective voltage at the input of the constant voltage source is changed. Since, in addition, the reverse current of the diode is very temperature-dependent, there is also a strong temperature dependency for the effect of influencing the voltage that is currently effective at the input of the constant voltage source.
Für die Erfindung besteht die Aufgabe, in einer Schaltungsanordnung der eingangs angegebenen Art mit möglichst geringem Aufwand den Einfluß des Diodensperrstromes zu eliminieren, sowie die aufgezeigte Temperaturabhängigkeit zu beseitigen.The object of the invention is to eliminate the influence of the diode reverse current in a circuit arrangement of the type specified at the outset with as little effort as possible, and to eliminate the temperature dependency shown.
Die Erfindung löst die gestellte Aufgabe dadurch, daß der Verbindungspunkt zwischen dem zweiten Widerstand und der Diode über einen dritten Widerstand mit dem Ausgang der Konstantspannungsquelle verbunden ist, über welchen bei Beanspruchung der Diode in Sperrichtung ein über sie fließender Sperrstrom durch die Wirkung des gegenüber dem Widerstandswert des zweiten Widerstandes wesentlich niedrigeren Widerstandswertes des dritten Widerstandes abgeleitet und somit eine Beeinflussung der Konstantspannungsquelle weitgehend unterbunden, d.h. praktisch unwirksam gemacht wird.The invention solves the problem in that the connection point between the second resistor and the diode is connected via a third resistor to the output of the constant voltage source, via which, when the diode is used in the reverse direction, a reverse current flowing through it through the effect of the resistance value derived from the second resistor significantly lower resistance value of the third resistor and thus an influence on the constant voltage source largely prevented, that is made practically ineffective.
In der Zeichnung ist ein Ausführungsbeispiel der Erfindung nur in wesentlich zu ihrem Verständnis beitragenden Bestandteilen dargestellt, worauf dieselbe jedoch keineswegs beschränkt ist. An eine spannungsgesteuerte Konstantspannungsquelle N sei ausgangsseitig über eine Ausgangsklemme B ein nicht gezeigter Regler angeschlossen. Die spannungsgesteuerte Konstantspannungsquelle ist in an sich bekannter Weise ausgebildet. In diesem Zusammenhang ist auf die Bezeichnungen "Operationsverstärker", "Spannungsfolger" und "Impedanzwandler" hinzuweisen. Eine spannungsgesteuerte Konstantspannungsquelle liefert - wie schon ihr Name sagt - unabhängig vom jeweils fließenden Ausgangsstrom - in bestimmten Grenzen natürlich, bezogen auf diesen Ausgangsstrom - eine Ausgangsspannung, die bei konstanter Eingangsspannung ebenfalls konstant ist, wobei die Ausgangsspannung der Eingangsspannung gleich ist. Durch Anlegung einer bestimmten Eingangsspannung kann also die Ausgangsspannung diktiert werden.In the drawing, an embodiment of the invention is shown only in components which contribute significantly to its understanding, to which the same is in no way limited. On a voltage-controlled constant voltage source N, a controller (not shown) is connected on the output side via an output terminal B. The voltage-controlled constant voltage source is designed in a manner known per se. In this context, reference should be made to the terms "operational amplifier", "voltage follower" and "impedance converter". A voltage-controlled constant voltage source delivers - as its name suggests - regardless of the flowing output current - within certain limits, of course, based on this output current - an output voltage that is also constant at a constant input voltage, the output voltage being the same as the input voltage. By applying a certain input voltage, the output voltage can be dictated.
Über eine erste Eingangsklemme A ist eine Referenzspannung zuführbar, die im Normalfall dazu dienen soll, die Eingangsspannung für die spannungsgesteuerte Konstantspannungsquelle N zu bestimmen. Zwischen die genannte erste Eingangsklemme A und den Eingang G der Konstantspannungsquelle ist ein R-C-Glied geschaltet, dessen Widerstand R1 im Längszweig und dessen Kondensator C1 im Querzweig liegt. Das R-C-Glied kann einer Verzögerungswirkung und/oder einer Störimpulsunterdrückung und/oder einer Rauschunterdrückung mittels Filterung dienen. Die Referenzspannung UA dient also im Normalfall zur Steuerung der Konstantspannungsquelle N über ihren Eingang G. Die Spannung UC an diesem Eingang ist gleich der Kondensatorspannung.A reference voltage can be supplied via a first input terminal A, which should normally serve to determine the input voltage for the voltage-controlled constant voltage source N. An R-C element is connected between said first input terminal A and input G of the constant voltage source, the resistor R1 of which lies in the longitudinal branch and the capacitor C1 of which lies in the transverse branch. The R-C element can serve a delay effect and / or a noise suppression and / or a noise suppression by means of filtering. The reference voltage UA therefore normally serves to control the constant voltage source N via its input G. The voltage UC at this input is equal to the capacitor voltage.
Es ist auch noch eine zweite eingangsseitige Klemme E vorgesehen. Über diese Klemme möge eine übergeordnete Schalteinrichtung, z.B. ein übergeordneter Regler, eine Eingriffsmöglichkeit auf die Spannung UC haben, die unmittelbar zur Steuerung der Konstantspannungsquelle dient. Im Normalfall liegt die Spannung an der Klemme E höher, d.h. ist positiver als die Spannung am Eingang G. Im Normalfall ist also die Diode V in Sperrichtung beansprucht. Nur wenn die Spannung an der Klemme E niedriger wird als die Spannung am Eingang G, bestimmt die Spannung an der Klemme E die Spannung am Eingang G. In diesem vom Normalfall abweichenden Sonderfall setzt sich also die Spannung an der Klemme E weitgehend gegenüber der Referenzspannung durch und beeinflußt somit wesentlich die Ausgangsspannung der Konstantspannungsquelle. Dies wird in an sich bekannter Weise daduch bewerkstelligt, daß der Widerstandswert des Widerstandes R1 größer als der Widerstandswert des Widerstandes R2 gewählt ist. Der Widerstandswert des Widerstandes R1 und der Kapazitätswert des Kondensators C1 sind zunächst so festgelegt, daß die erwähnte Verzögerungswirkung und/oder Störimpulsunterdrückung und/oder die Rauschunterdrückung mittels Filterung gewährleistet ist bzw. sind. Der Widerstandswert des Widerstandes R2 ist also entsprechend kleiner gewählt als der Widerstandswert des Widerstandes R1.A second input-side terminal E is also provided. Via this terminal, a higher-level switching device, for example a higher-level controller, may have an option to intervene in the voltage UC, which is used directly to control the constant voltage source. In the normal case, the voltage at the terminal E is higher, that is, it is more positive than the voltage at the input G. In the normal case, the diode V is stressed in the reverse direction. Only if the voltage at terminal E becomes lower than that Voltage at input G, the voltage at terminal E determines the voltage at input G. In this special case, which deviates from the normal case, the voltage at terminal E largely prevails over the reference voltage and thus significantly influences the output voltage of the constant voltage source. This is accomplished in a manner known per se by selecting the resistance value of the resistor R1 to be greater than the resistance value of the resistor R2. The resistance value of the resistor R1 and the capacitance value of the capacitor C1 are initially defined in such a way that the aforementioned delay effect and / or interference suppression and / or noise suppression is or are ensured by means of filtering. The resistance value of the resistor R2 is therefore chosen to be correspondingly smaller than the resistance value of the resistor R1.
Im Normalfall liegt - wie bereits ausgeführt wurde - die Spannung an der Klemme E wesentlich höher (positiver) als die Spannung am Eingang G der Konstantspannungsqelle N. In diesem Betriebszustand ist die Diode V also im Sperrzustand. Dadurch ist die Klemme E vom übrigen Netzwerk entkoppelt.In normal cases - as has already been stated - the voltage at terminal E is significantly higher (more positive) than the voltage at input G of constant voltage source N. In this operating state, diode V is therefore in the blocking state. Terminal E is thus decoupled from the rest of the network.
Im Sperrzustand der Diode V fließt durch dieselbe bekanntlich ein geringer Sperrstrom. Wenn die über den Widerstand R3 und die Diode D verlaufende Verbindung nicht vorhanden wäre, würde der Sperrstrom der Diode V über die Widerstände R2 und R1 fließen. Dieser Sperrstrom ist, bedingt durch die Temperaturabhängigkeit des Sperrwiderstandes der Diode V, ebenfalls temperaturabhängig. Würde der Sperrstrom durch die Diode V über die Widerstände R2 und R1 fließen, so würde dies einen Spannungsabfall u.a. am Widerstand R1 hervorrufen, wodurch die Eingangsspannung am Eingang G der Konstantspannungsquelle N gegenüber der Referenzspannung an der Klemme A verschoben wäre, also in gewissem Umfange verfälscht wäre. Bei dieser Verfälschung würde sich zusätzlich auch noch die Temperaturabhängigkeit des Sperrwiderstandes der Diode V und damit des Diodensperrstromes sowie des zuvor genannten Spannungsabfalles auswirken.In the off state of the diode V, a small reverse current flows through it, as is known. If the connection through resistor R3 and diode D were not present, the reverse current of diode V would flow through resistors R2 and R1. This reverse current is also temperature-dependent, due to the temperature dependence of the blocking resistance of the diode V. If the reverse current would flow through the diode V through the resistors R2 and R1, this would cause a voltage drop, among other things, across the resistor R1, as a result of which the input voltage at the input G of the constant voltage source N would be shifted relative to the reference voltage at the terminal A, that is to say to some extent falsified would. With this falsification, the temperature dependence of the blocking resistance of the diode V and thus of the diode blocking current and of the voltage drop mentioned above would also have an effect.
Um den erläuterten Verfälschungseffekt zu beseitigen, ist gemäß einer ersten Version des Ausführungsbeispieles der Erfindung der Widerstand R3 vorgesehen, der gemäß der Zeichnung den Ausgang der Konstantspannungsquelle N mit dem Verbindungspunkt zwischen dem Widerstand R2 und der Diode V verbindet. Der Widerstandswert dieses Widerstandes R3 möge wesentlich niedriger gewählt sein als der Widerstandswert des Widerstandes R2. Diese Verbindung zwischen der Anode der Diode V und dem Ausgang der Konstantspannungsquelle bewirkt, daß der verfälschende Einfluß des Sperrstroms der Diode V auf die Eingangsspannung UC am Eingang G der Konstantspannungsquelle N ganz wesentlich herabgesetzt wird. Dieser Einfluß wird praktisch unwirksam gemacht. Der Widerstandswert des Widerstandes R3 kann wesentlich niedriger gewählt werden als der Widerstandswert des Widerstandes R2; denn der Widerstandswert des Widerstandes R3 hat praktisch keinen Einfluß auf die Spannung am Eingang G der Konstantspannungsquelle N, weil am Eingang und am Ausgang der Konstantspannungsquelle genau oder fast genau die gleiche Spannung liegt.In order to eliminate the falsified effect explained, according to a first version of the exemplary embodiment of the invention, the resistor R3 is provided, which, according to the drawing, connects the output of the constant voltage source N to the connection point between the resistor R2 and the diode V. The resistance value of this resistor R3 may be chosen to be substantially lower than the resistance value of the resistor R2. This connection between the anode of the diode V and the output of the constant voltage source has the effect that the distorting influence of the reverse current of the diode V on the input voltage UC at the input G of the constant voltage source N is significantly reduced. This influence is made practically ineffective. The resistance value of the resistor R3 can be chosen to be significantly lower than the resistance value of the resistor R2; because the resistance value of the resistor R3 has practically no influence on the voltage at the input G of the constant voltage source N, because exactly or almost exactly the same voltage is present at the input and at the output of the constant voltage source.
Der Widerstand R3 stellt jedoch für den Sperrstrom, der durch die Diode V fließt, einen niederohmigen Weg dar, so daß der weitaus größte Teil dieses Sperrstroms über den Widerstand R3 abfließen kann und nur noch ein verschwindend kleiner Teil über die Widerstände R2 und R1.However, the resistor R3 represents a low-impedance path for the reverse current flowing through the diode V, so that the vast majority of this reverse current can flow off via the resistor R3 and only a negligible part via the resistors R2 and R1.
Geht man nun von einem bestimmten Sperrstrom, der durch die Diode V fließt, aus, so ergibt sich die am Eingang G jeweils wirksame Spannung gemäß der nachfolgend angegebenen Formel:
Es sei auch noch auf die weitere Möglichkeit hingewiesen, anstelle des Widerstandes R3 oder zusätzlich zu diesem eine weitere Diode D vorzusehen, die in der aus der Zeichnung ersichtlichen Weise so geschaltet ist, daß sie für den genannten Sperrstrom stromdurchlässig ist. Sie kann also anstelle des Widerstandes R3 vorgesehen werden, kann aber auch zum Widerstand R3 parallelgeschaltet vorgesehen werden. Hierbei wäre eine Diode auszuwählen, die in Durchlaßrichtung einen sehr geringen Spannungsabfall verursacht, wenn sie vom Sperrstrom der Diode V in Durchlaßrichtung durchflossen wird.It should also be pointed out the further possibility, instead of the resistor R3 or in addition to this one to provide further diode D, which is connected in the manner shown in the drawing so that it is current-permeable to the reverse current mentioned. It can therefore be provided instead of the resistor R3, but can also be provided in parallel with the resistor R3. Here, a diode would have to be selected which causes a very low voltage drop in the forward direction when the reverse current of the diode V flows through it in the forward direction.
Claims (3)
- Circuit arrangement for a voltage-controlled constant voltage source (N), the input of said constant voltage source (N) being connected to the output of an RC network (R1, C1), said RC network serving to provide a delay effect and/or an interference pulse suppression and/or a noise suppression by means of filtering and having a first resistor (R1) in the series arm between an input (G) of the constant voltage source (N) and a first terminal (A) supplying a reference voltage (UA) and having a capacitor (C1) in the shunt arm, and the input of which is additionally connected to a second resistor (R2) and via the latter and via a diode (V) arranged in series thereto to a second terminal (E), via which such various voltages can be supplied, by means of which the diode (V) can be activated in the forward direction or in the reverse direction, in which, given activation in the forward direction, a control voltage supplied via the second terminal (E) largely prevails over the reference voltage (UA) supplied via the first terminal (A) due to the resistance effect of the resistor (R1) of the RC network (R1, C1) at the voltage-controlled constant voltage source (N), characterised in that the interconnection point between the second resistor (R2) and the diode (V) is connected via a third resistor (R3) to the output (B) of the constant voltage source (N), via which, when the diode (V) is activated in the reverse direction, a blocking-state current flowing across it is diverted due to the effect of the considerably lower resistance value of the third resistor (R1) in comparison with the resistance value of the second resistor (R2), and hence an influencing of the constant voltage source (N) is largely prevented, that is to say is rendered virtually ineffective.
- Circuit arrangement according to Claim 1, characterised in that the third resistor is designed to be a further diode (D) which is switched in such a way that it allows the aforesaid blocking-state current to flow through.
- Circuit arrangement according to Claim 1, characterised in that there is arranged parallel to the third resistor (R1) a further diode (D) which is switched in such a way that it allows the aforesaid blocking-state current to flow through.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT89100348T ATE80238T1 (en) | 1988-01-18 | 1989-01-10 | CIRCUIT ARRANGEMENT FOR A VOLTAGE CONTROLLED CONSTANT VOLTAGE SOURCE WITH INPUT R-C ELEMENT. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3801221 | 1988-01-18 | ||
| DE3801221 | 1988-01-18 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0325147A2 EP0325147A2 (en) | 1989-07-26 |
| EP0325147A3 EP0325147A3 (en) | 1989-09-06 |
| EP0325147B1 true EP0325147B1 (en) | 1992-09-02 |
Family
ID=6345448
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP89100348A Expired - Lifetime EP0325147B1 (en) | 1988-01-18 | 1989-01-10 | Circuit arrangement for a voltage-controlled constant voltage source with an input side rc network |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0325147B1 (en) |
| AT (1) | ATE80238T1 (en) |
| DE (1) | DE58902165D1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5357214A (en) * | 1993-06-03 | 1994-10-18 | Apple Computer, Inc. | Methods and apparatus for microphone preamplification |
| SE509679C2 (en) * | 1997-04-10 | 1999-02-22 | Ericsson Telefon Ab L M | Method for controlling a DC voltage from a DC-DC converter and a DC-DC converter |
| US9800214B2 (en) * | 2015-03-30 | 2017-10-24 | Qualcomm Incorporated | Power supply rejection rate through noise cancellation in an audio amplifier loop |
| CN112564848B (en) * | 2020-11-26 | 2022-05-31 | 珠海格力电器股份有限公司 | Interference signal filtering device, automobile and interference signal filtering method of automobile |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3832627A (en) * | 1971-09-25 | 1974-08-27 | Sony Corp | Transistor circuit with slow voltage rise and fast voltage fall characteristic |
| US3864624A (en) * | 1972-05-31 | 1975-02-04 | Yokogawa Electric Works Ltd | Standard voltage generating circuit |
| DE2403265A1 (en) * | 1974-01-24 | 1975-08-07 | Bosch Elektronik Gmbh | Constant reference voltage generator - accommodates varying load and Zener diode linear amplifier and number of resistors |
| US4327319A (en) * | 1980-08-15 | 1982-04-27 | Motorola, Inc. | Active power supply ripple filter |
-
1989
- 1989-01-10 DE DE8989100348T patent/DE58902165D1/en not_active Expired - Fee Related
- 1989-01-10 AT AT89100348T patent/ATE80238T1/en not_active IP Right Cessation
- 1989-01-10 EP EP89100348A patent/EP0325147B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP0325147A3 (en) | 1989-09-06 |
| ATE80238T1 (en) | 1992-09-15 |
| EP0325147A2 (en) | 1989-07-26 |
| DE58902165D1 (en) | 1992-10-08 |
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