AT227348B

AT227348B - Arrangement for temperature control of electrical heating devices

Info

Publication number: AT227348B
Application number: AT947559A
Authority: AT
Original assignee: Schaltbau Gmbh
Priority date: 1958-12-31
Filing date: 1959-12-30
Publication date: 1963-05-10

Description

  

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  Anordnung zur Temperaturregelung von elektrischen Heizeinrichtungen 
 EMI1.1 
 

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 EMI2.1 
 den Schaltern F   uns fez   die Umkehrung des Spannungsteilers   R-Ry   Durch entsprechende Bemessung des
Kondensators lassen sich hiebei Abfallzeiten bis zu 1000 sec erzielen, wenn die Umgehungstemperatur und die Spannung konstant sind. Da sich Temperatur und Spannungsschwankungen auf die Ein- und Aus- 
 EMI2.2 
 
Heizleistungflusst. Die beiden Grenzwerte, d. h.   00/0 und 1000/0   Einschaltdauer ergeben sich, wenn der Anfangsladestrom kleiner als der Abfallsteuerstrom für Relais S ist. 



   Die Transistoren liegen an einer Teilspannung von etwa 6 V, damit der Reststrom der Transistoren beim Ladestrom   J=O   des Kondensators    C   kleiner als der Abfallstrom des Relais S ist. 



   Der Widerstand R4 bewirkt ein sicheres Anziehen von Relais S unabhängig vom Anfangsladestrom von
Cl. Der Kondensator C2 verzögert den Anzug von Relais S um etwa 0, 5 sec, um die einwandfreie Fort-   schaltung von Relais F zu sichern. Durch den Kondensator C3 wird sin zuverlässiges Anziehen des Relais S   auch bei ungleichmässig justierten Kontakten erreicht. An Stelle der in der Fig. 2 dargestellten Anzeigelampe L tritt im Bedarfsfalle die Spule des Heizschützes H gemäss Fig. 1.



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  Arrangement for temperature control of electrical heating devices
 EMI1.1
 

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 EMI2.1
 the switches F and fez the inversion of the voltage divider R-Ry By appropriate dimensioning of the
Capacitor can fall times of up to 1000 sec if the bypass temperature and the voltage are constant. Since temperature and voltage fluctuations affect the on and off
 EMI2.2
 
Heating power flows. The two limit values, i.e. H. 00/0 and 1000/0 duty cycles result when the initial charging current is less than the drop control current for relay S.



   The transistors are connected to a partial voltage of about 6 V, so that the residual current of the transistors when the charging current J = O of the capacitor C is smaller than the waste current of the relay S.



   The resistor R4 causes a reliable pull-in of relay S regardless of the initial charging current of
Cl. The capacitor C2 delays the pick-up of relay S by about 0.5 seconds in order to ensure that relay F continues to function properly. The capacitor C3 ensures that the relay S is reliably attracted even if the contacts are unevenly adjusted. In place of the indicator lamp L shown in FIG. 2, the coil of the heating contactor H according to FIG. 1 occurs if necessary.

Claims

PATENT CLAIM: EMI2.3 vehicles and lounges, a voltage divider formed from an ohmic resistor and a resistor with a negative temperature coefficient, which is exposed to the temperature influencing the regulation, is connected to a voltage source and the partial voltage formed is fed to a control device containing a relay that switches the heating current on and off, characterized in that, that the relay (A) is arranged in the collector circuit of a transistor (T), with the partial voltage taken from the voltage divider (Rj, R) connected to the voltage source designed as a direct voltage source via the series connection of an ohmic resistor (R.) and a capacitor (C. ), which the latter an additional normally closed contact (A,)

of the relay (A) is connected in parallel to the base of the transistor (T).