DE1463434A1 - Circuit arrangement for the delivery of a direct current stabilized against fluctuations in the input voltage - Google Patents

Description

Description 'H63434

to the x'atentgesuoh

the company Maatscha ppi 3 voor Electrische Bedri ji'seutoiiit tisering Electrofect N.V., Amersfoort / Netherlands

"concerning:

"Circuit order to the" bge "with a direct current stabilized against swings \ of the input voltage"

The invention relates to a circuit arrangement for delivering a stabilized against swings of the input voltage Direct current.

Ea is already a dererti ^ e circuit arrangement with A regulating transistor proposed, dewsen collector over belt power terminals and its emitter via an egg resistor are connected to a source of equal voltage while the base with a tapping of a sρε ■ Voltage divider is connected between the two terminals connected to the input voltage source is and fluctuations in the input voltage with reduced Amplitude to the base-emitter path and the emitter resistance stood through.

With this circuit arrangement, the voltage is dependent on the voltage Voltage divider only slightly depends on the singing voltage dependent voltage, with a εus of the sum of the voltage drops in the base-emitter path of the Re ^ eI-tr & naistora and the emitter resistance existing negative feedback

809812/0927 & ® ORIGINAL

- 2 -

voltage is compared. Since the emitter current is in a fixed relationship to the collector tr om, and there the .G size of these two currents almost exclusively from the base-emitter voltage "is determined, arises on this // wise a stabilized collector current. Here is the sum of the voltage drops in the emitter resistor and the base emit cer-S tr ecke of the control transistor of the voltage-dependent Voltage divider supplied reference voltage equal.

This applies within wide limits regardless of the value of the collector voltage. Palls this under the buckling stress drops or rises above the breakdown voltage, the limits have been reached, v / o the collector current below the stabilized value falls or rises beyond it.

The reference voltage can be generated in different ways. According to the most frequently used method, the voltage dependent voltage divider consists of an ohm ¹ resistor and a voltage stabilizer, such as a Zener diode, one or more forward-biased selenium rectifiers, an electrolytic stabilizer cell or a glow lamp. A reference voltage can also be generated by means of a flow stabilizer, for example an iron-hydrogen resistor.

In each pail the reference voltage is never complete independent of fluctuations in the input voltage. At a Rise in input voltage above the setpoint increases albeit to a much lesser extent - the reference voltage on, so that the current delivered also rises somewhat.

The aim of the invention is to create a circuit arrangement in which the influence of input voltage fluctuations is almost completely compensated.

Accordingly, there is a circuit arrangement according to the invention characterized in that between the

8 0 98 12/092 7

BATHROOM ORIGINAL - 3 -

sdlilossenen terminal and the emitter of the Ro.jel transistor a resistor is inserted, which is in the context of a compensation the influence of fluctuations in the input voltage is dimensioned for the output current.

The details of the invention can be found in the following Bqe <: for a preferred embodiment example of the accompanying drawings:. ■ · ·

The input voltage U. is applied to the connection terminals 1, απ, εη which, a resistor :. 3 and Zener diode 4 existing tipi nnungteiler is connected. The collector of a re ä geltransistors 5 is kleiamen BeIastungyanschlui-din about 6, 7 and a Gleiehtipannungscjuollc; with the connection terminal 2, while the emitter of the control transformer 5 is applied to the same connection terminal 2 via an emitter resistor εη. Such a circuit arrangement is known.

The applied to the Zener diode 4, from jjxngi. Voltage fluctuations almost independent voltage serves as a reference voltage. So that those of Jchwanjcungen the. Input _{C x} .; Nnung U. herl'Lihrenuen slight 3cii fluctuations: .korapenaiert v; grounding, tables, the input cleavage and the.emitter of the control transistorc 5 a V / idersta.nd 9.-

Via this V / iderstt na 9, voltage values corresponding to the fluctuation of the input voltage reach the emitter of the control transistor, so that? The Easis-Smitter-syi nnion of the regulating transformer must remain uno ot with the output stream ^{1 Q.}

under the Vcrt uasetsung, άε.ώ der Regeltr; nsistor the voltage divider 5.4 etc. 9, a not noticeably loaded, v; eö in which Jrr <xis essentially applies, kr.nn the 7 / ert of resistance 2 is calculated as fol ^ t!

i: ei a.r. Increase in the input gas position U, uia an amount Δ U erh'-i It na. Η au ö-ci 3 ^i: b ± ü des Re :. eltr; nöistorü * a S ₁ approach fluctuation

BATH ORIGINAL

80981 2/0927

R ₃₊ R ₄ ■ =

where R, denotes the dynamic resistance of the Zener diode 4 The voltage fluctuation fed to the emitter is

8 A TT

and should be equal to the aforementioned voltage fluctuation, see above that the relationship

E_ R Ro

9 ~ 3 '

results.

A similar compensation can also be achieved with a different design of the voltage-dependent voltage divider. Instead of the resistor 3 , a current stabilizer can also be used, for example, and the Zener diode can be replaced by an ohm ¹ resistor. Even better stabilization is achieved if a Zener diode 4 is combined with a current stabilizer 3 . Any switching element whose resistance increases sharply with increasing current can be used as a current stabilizer, such as an iron-hydrogen resistance. On the other hand, any switching element with a resistance that decreases with increasing current can serve as a voltage stabilizer, such as a Zener diode, one or more selenium rectifiers, an electrolytic stabilization cell, a glow lamp or a resistor with a decreasing characteristic curve.

You can also replace the resistor 8 by a current stabilizer in each of these possible circuits, whereby an even better stabilization of the output current

809812/0927

ORJGiMAL INSPECTED

gives. The stabilization is due to the high Gregen coupling factor favored by the high dynamic resistance of the switching element is caused.

With the resistance values R ,, R ,, Rq and Rq are respectively the dynamic resistance values are meant insofar as they are different from the relevant static resistance values.

809812/0927

Claims (6)

Patent claims 1 . Circuit arrangement for the delivery of one opposite Fluctuations in the input voltage stabilized direct current with a control transistor, the collector of which is connected to the BeIasta.ngsklemm.en and whose emitters are connected to a DC voltage source via an emitter resistor, while the Base with a tap of a voltage-dependent voltage divider is connected, which is connected between the two terminals of the input DC voltage source and Lets through fluctuations in the input voltage with reduced amplitude to the base-emitter path, characterized in that that between the terminal connected to the base (1) and the emitter of the control transistor (5) a resistor (9) is inserted, which serves to compensate for the influence of fluctuations in the input voltage is dimensioned for the output current. 2. Circuit arrangement according to claim 1 ,. their voltage divider from a resistor inserted between the base of the regulating transistor and the associated connecting terminal as well as a voltage stabilizer, such as a zener diode or a glow lamp, between the base and the respective other pole of the voltage source, characterized in that the resistor (9) connected to the emitter of the control transistor is roughly the product of the emitter resistance (8) with the base resistance (3) divided by the dynamic resistance of the voltage stabilizer (4) is equal. 3. Circuit arrangement according to claim 2, characterized by a current stabilizer, such as an iron-hydrogen resistor, as the base resistor (3) in the voltage divider. 80 98 12/09 27 4. Circuit arrangement *. NaGh claim 3, characterized in that that the resistor (9) connected to the emitter of the control transistor is approximately the product of the emitter resistance (8) with the dynamic resistance of the Stromstahilizer (3) divided by the resistance of each other branch (4) of the voltage divider is the same. 5. Circuit arrangement according to claim 3, characterized in that that the resistor (9) connected to the emitter of the control transistor is approximately the product of the emitter resistance suades (8) with the dynamic resistance of the current stabilizer (3) divided by the dynamic resistance f of the voltage stabilizer (4) is the same. 6. Circuit arrangement according to one of claims 1 "to 5> characterized in that the emitter resistor (8) consists at least partially of a StromstalDilizer "where" into the above relationship as the resistance value of the emitter resistor the dynamic resistance is used. β 0 9 8 1 2/0 θ 2