DE1806352C

DE1806352C - Circuit arrangement for the direct current supply of electrical assemblies

Info

Publication number: DE1806352C
Authority: DE
Inventors: Dieter 8500 Nürnberg Henkelmann
Original assignee: Metrawatt GmbH, 8500 Nürnberg
Publication date: 1972-11-30

Description

werte aller Spannungen näherungsweise gleich sein, alsovalues of all voltages are approximately the same, i.e.

Diese Forderung ist durch entsprechende Dirnensionierung de·· Zenerdioden 7,8 und ihres Vorwiderstandes 6 ohne weiteres zu erfüllen. Bei positiver Aussteuerung des Differenzverstärkers fließt ein von U₃ ausgehender Laststrom über Nullpotential 11 und die Zenerdiode 8 zur Diode 3 zurück. Bei negativer Aussteuerung des Differenzverstärkers kann ein von U_t ausgehender Laststrom nur vom Querstrom über die Zenerdiode 8 abgezweigt werden. Dieser ist jedoch durch den v_orwitierstand 6 begrenzt. Um den Querstrom durch die Zenerdiodo 8 zu erhöhen, ohne gleichzeitig auch die Zenerdiode 7 zu belasten, kann ein Widerstand 9 zwischen Punkt 10 und 11 zusätzlich in die Schaltung eingefügt werden.This requirement can easily be met by appropriately dimensioning the Zener diodes 7, 8 and their series resistor 6. With positive modulation of the differential amplifier, a load current emanating from U ₃ flows back to diode 3 via zero potential 11 and Zener diode 8. In the event of a negative modulation of the differential amplifier, a load current emanating from U _t can only be branched off from the cross current via the Zener diode 8. However, this is limited by the _6th executive committee. In order to increase the cross current through the Zener diode 8 without simultaneously loading the Zener diode 7, a resistor 9 can also be inserted into the circuit between points 10 and 11.

Bei symmetrischen Ausgangsgröße" der Stromversorgungsschaltung muß die Zenerdiode 8 eine wesent- ao lieh höhere Verlustleistung vertragen können als die Zenerdiode 7. Es wird also eine Leistungszenerdiode erforderlich sein. Besonders günstig ist es natürlich, wenn auch an der Zenerdiode 8 eine so geringe Verlustleistung abfällt, daß keine Leistungszenerdiod 2 mehr benötigt wird. Das ist der Fall, wenn z. B. ein zu speisender Differenzverstärker nur einseitig oder zumindest unsymmetrisch ausgesteuert wird. Unter dieser Voraussetzung istIn the case of a symmetrical output value of the power supply circuit, the Zener diode 8 must be able to withstand a significantly higher power loss than the Zener diode 7. A power Zener diode will therefore be required. that no power zener diode 2 is required anymore, which is the case if, for example, a differential amplifier to be fed is only controlled on one side or at least asymmetrically

I U₁ 1 « I U₃ 1 > I U₂ 1 = I (Z₄1.
Obwohl auch jetzt der Laststrom über die Zenerdiode 8 fließt, bleibt die Verlustleistung durch die geringe Zenerspannung ebenfalls geringer und kann im Extremfall sogar kleiner sein als bei der Zenerdiode 7, die zwar nur mit geringem Querstrom beaufschlagt ist, aber eine hohe Zenerspannung besitzt. Ein besonderer Vorteil der neuen Schaltung ist es, daß nur eine Zenerdiode, und zwar bei unsymmetrischer Stromversorgung die mit der kleineren Zenerspannung, vom Gesamtstrom durchflossen wird. Die andere Zenerdiode durchfließt ein wesentlich kleinerer, nur zur Spannungsstabilisierung erforderlicher Strom. Dadurch ergibt sich a dieser Zenerdiode eine von Lastschwankungen unabhängige, gut stabilisierte Spannung, und gleichzeitig bleibt die Verlustleistung und damit die Wärmeentwicklung wesentlich geringer. Diese Vorteile gegenüber den bekannten Schütungen werden praktisch ohne größeren Bauteileaufwand erreicht, weil dem zusätzlichen Kondensator der neuen Schaltungsanordnung eine andernfalls erforderliche Leistungszenerdiode und ein Vorwiderstand für größere Verlustleistung gegenüberstehen. I U ₁ 1 «I U ₃ 1> I U ₂ 1 = I (Z ₄ 1.
Although the load current now also flows through the Zener diode 8, the power loss due to the low Zener voltage also remains lower and, in extreme cases, can even be smaller than with the Zener diode 7, which only has a low cross current applied to it, but has a high Zener voltage. A particular advantage of the new circuit is that the total current flows through only one Zener diode, namely the one with the lower Zener voltage in the case of an asymmetrical power supply. A much smaller current flows through the other Zener diode, which is only required for voltage stabilization. This results in a well-stabilized voltage for this Zener diode that is independent of load fluctuations, and at the same time the power loss and thus the heat development remain significantly lower. These advantages over the known fillings are achieved with practically no major expenditure on components because the additional capacitor of the new circuit arrangement is opposed to an otherwise required power zener diode and a series resistor for greater power dissipation.

Hierzu 1 Blatt Zeichnungen1 sheet of drawings

Claims

1 2 means not only that expensive power zener diodes D _, must be selected, but due to the high claims: power loss also results in a large amount of heat, which z. B. in connection with temperature

1. Circuit arrangement for DC-S sensitive differential amplifiers is very disadvantageous. supply of electrical assemblies, in which several Another disadvantage is that cMe Span Zener diodes lying in series via a fore stabilization on the Zener diodes due to the resistance to a direct voltage source drops sharply.
are closed and on the Zener diodes in relation to the object of the invention is, for preferably on a tap between the Zener diodes, the xo asymmetrical power supply circuits a common zero potential, positive and better voltage stability can be tapped on the Zener diodes and negative stabilized voltages, and less power loss to reach. On one characterized in that a mains alternating current supplied in the circuit consisting of diodes (2,3) and a transformer should not need any additional voltage multipliers (4,5) built-up voltage multipliers or taps The DC voltage source should also not increase the cost of materials and that there should be a series between the two.

This object is achieved according to the invention in an unstabilized voltage (U ₃ ) which can be alternated with an unstabilized voltage (U 3) compared to the common zero potential circuit arrangement of the initially described (11) is. fed by diodes (2, 3) and capacitors (4, 5)

2. Circuit arrangement according to claim 1, there- constructed voltage multiplication circuit as characterized in that between the common DC voltage source is used and that between the same zero potential (11) and the tap (10) the series capacitors (4,5) for a unstabilized voltage (U ₃ ) a resistor 15 tap (10) is located on the opposite to the common (9). seed zero potential (11) an unstabilized voltage (U ₃ ) can be removed.

It is an alternating current fed direct current

care order for the submission of two different

30 where direct voltages are known, in which a voltage multiplying circuit made up of diodes and capacitors is used and the one voltage across the series connection of the capacitors

The invention relates to a circuit and the other voltage at a tap between the arrangement for direct current supply electrical 35 the capacitors and the * ^; NEN connection point assemblies, in which several Zener diodes in series are connected in series with the capacitors removed diodes via a series resistor to a DC (German Auslegeschrift 1 0S9 067). Connected this scarf voltage source and ^r to the Zene - but processing can be no reference to this diode relative to a tap between the invention, because at its 40th possibility is only of the Zener diodes, which serves as a common zero potential, made, except for the doubly positive and negative stabilized voltages from the voltage also the simple voltage can be tapped. to take. This is particularly clear from the fact that the common zero potential for the two equals is by no means always required of such a power supply circuit that all tap voltages, in contrast to the subject of the invention, must be stabilized. 45 at the lower connection of the series circuit of the This fact is particularly important when capacitors are connected.

of the unstabilized supply voltage. The invention is in the following at hand

lent higher supply currents are required as an exemplary embodiment and explained in more detail in the

from the stabilized supply voltage. So must drawing shown.

in a differential amplifier, for example, the 50

Pre-stages with a stabilized voltage and Doppler circuit, formed from a transformer 1,

low current are supplied while the end of the diodes 2, 3 and the capacitors 4, 5 is

stage generally no stabilized voltage, a voltage Uo generated that is sufficiently horh,

but one that demands a high current. Differential amplifier to the Zener diodes 7, 8 via a resistor 6

with asymmetrical output (e.g. to generate output voltage 55 well stabilized voltages U _x , U _1,

voltage —IV ... 0 ... -f-20 V) are advantageously also between the capacitors 4, 5 de; Tension

with asymmetrical supply voltages, an unstable double pole circuit is created at point 10.

feeds, so that larger supply currents are only taken in ized voltage U ₃ , which is used to supply

one direction (e.g. positive) are output from a main circuit, not shown in detail

have to. 60 is used, so that only the Zener diode 8 of the total current

Power supply circuits are known with in is flowed through, while the Zener diode 7 alone

Zener diodes connected in series, all of which serve to stabilize U _1,

supply voltages can be tapped without

take into account that not all voltages are stabilized supply circuit to supply a symmetrical

must be. These circuits have the disadvantage that 65 differential amplifiers are used, the preamp of which is stable

dali the Zener diodes to compensate for load fluctuating voltages with low current and its

Output stage unstabilized voltages, but high voltages

high current flowing through it. That need electricity. In this case the absolute