BE660290A

BE660290A -

Info

Publication number: BE660290A
Authority: BE
Priority date: 1964-02-28
Filing date: 1965-02-26
Publication date: 1965-06-16
Also published as: CH407294A; FR1426504A

Description

  

  *Stabilisateur de tension pour appareils à courant continu"

  
La présente invention est relative à un stabilisateur de tension pour appareils à courant continu, à pôle positif mis à la terre, et comporte l'emploi de transistors*

  
Il est connu, pour stabiliser les tensions dans les appareils à courant continu, de brancher, en amont de la  tension d'utilisateur, un transistor, commandé par la tension même du circuit utilisateur. A cette fin, on applique la tension d'utilisation, à la base du transistor et prélève :

  
 <EMI ID=1.1> 

  
tension d'utilisation varie, il en résulte une modification

  
 <EMI ID=2.1> 

  
 <EMI ID=3.1> 

  
la résistance du transistor, Par suite, la chute de tension 

  
 <EMI ID=4.1> 

  
 <EMI ID=5.1> 

  
est ramenée à la valeur initiale. Le processus s'opère dans 

  
 <EMI ID=6.1> 

  
 <EMI ID=7.1> 

  
PNP, où la tension-réglée apparaît à l'émetteur, 

  
Or, actuellement, la situation se présente de telle 

  
 <EMI ID=8.1> 

  
pour appareils exposés aux températures élevées. 

  
Il pourrait venir à l'esprit d'utiliser simplement 

  
 <EMI ID=9.1> 

  
quels peuvent aussi être étudiés en vue de températures  élevées. Or, ceci ne peut pas être réalisé sans plus dans un 

  
 <EMI ID=10.1> 

  
dans ce cas, la régulation fonctionnerait en sens inverse,,



  * Voltage stabilizer for direct current devices "

  
The present invention relates to a voltage stabilizer for direct current devices, with an earthed positive pole, and involves the use of transistors *

  
It is known, in order to stabilize the voltages in direct current devices, to connect, upstream of the user voltage, a transistor, controlled by the voltage of the user circuit itself. To this end, we apply the operating voltage at the base of the transistor and take:

  
 <EMI ID = 1.1>

  
operating voltage varies, resulting in a modification

  
 <EMI ID = 2.1>

  
 <EMI ID = 3.1>

  
the resistance of the transistor, Consequently, the voltage drop

  
 <EMI ID = 4.1>

  
 <EMI ID = 5.1>

  
is reset to the initial value. The process takes place in

  
 <EMI ID = 6.1>

  
 <EMI ID = 7.1>

  
PNP, where the voltage-regulated appears at the transmitter,

  
However, currently, the situation is such

  
 <EMI ID = 8.1>

  
for devices exposed to high temperatures.

  
It might occur to mind to simply use

  
 <EMI ID = 9.1>

  
which can also be studied for high temperatures. However, this cannot be achieved without more in a

  
 <EMI ID = 10.1>

  
in this case, the regulation would work in the opposite direction,

Claims

To avoid this drawback, and according to the invention, it is suggested to use NPN power transistors

and take the stabilized voltage from the collector of the transistor.

An exemplary embodiment of the object of the invention is shown in the accompanying drawing. In this case, the voltage is applied through an amplifier. The <EMI ID = 11.1>

medial of NPN type power transistor 1, at voltage U2 to be sampled. Note that the collector of the transistor

In order to allow regulation, the

base transmits the voltage, through the collector associated therein, to the amplifying transistor 3. The collector voltage of the latter is in turn applied to the base of the tuning transistor 1. The auxiliary voltage required for the transistors is applied in point 4. In addition, the resistance

It is thus obtained, by simple means, that NPN power transistors can now also be

earth, which offers the possibility, even in the case of devices subjected to high temperatures, to operate the regulation using power transistors.

1. Voltage stabilizer for direct current devices with earthed positive pole, using transistors connected upstream of the stabilized voltage, characterized in that it uses transistors of

2. Voltage stabilizer according to claim 1, characterized in that the stabilized voltage is applied to the