1. TR series (from 6V, lA up to 24V, 1OA)
   Low power single phase transistor supplies.
2. TH1 series (from 24V, 10A up to 220V, 25A)
   Single phase thyristor supplies.
3. TH3 series (from 24V, 100A up to 220V, 100A)
   Three phase thyristor supplies.
4. Special series
   Other specifications and performances are available on request.
   
   

The same circuit can fix either:

1. Regulation of output voltage ± 1% for mains supply voltage variations of ± 10% and load variations from 0 à 100%.
2. Automatic limiting of the output current To ± 2% of the nominal value.
   Note : These performances are according to Standard DIN n° 41773 of VDE. This rectangular characteristic (see fig. 2 - curve Ul) in the design performances is the only one to guarantee a perfect state of charge of a stationary battery permanently connected to the emergency circuits.
   
   

1. TR series (transistorised supplies)
   
   The AC mains voltage is transformed, then rectified by means of a rectifier bridge with 4 diodes and filtered by an L-C filter. The power transistors in series in the output line act as a variable resistance whose value is such that at all times the output voltage is stabilised (or in the case of over-load, the current is limited. The regulation circuit receives feedback signals proportional to the output voltage and current from which the differences with regard to the voltage and current references are amplified in order to control the base of the power transistors (see fig.1A).
   
   
   
2. TH1 & TH 3 series (thyristor supplies)
   
   

In these supplies the rectification is made by means of 2 thyristors and 2 power diodes (series TH 1) or by means of 3 thyristors and 3 diodes (series TH 3).
In the serie TH 1 the very pulsy current is filtered by means of an inductance. The regulation circuit controls the thyristors from the feedback signals U out and I out onwards (see fig.1 b).
Note : in certain cases the thyristor and diode rectifier is replaced by a diode rectifier and the thyristors are mounted in the primary of the transformer.

Our standard supplies are completely assembled and wired in metal enclosures (wall or floor mounted).
They consist essentially of:

• Rail mounted connecting terminals.
• Protection of input by circuit breaker.
• Transformer with separate windings.
• 4 diode rectifier for series TR 2 thyristors and 2 diodes for seriesTH1, 3 thyristors and 3 diodes for series TH 3 (see note at end of § 4.2).
  
• Integral protection of the rectifiers by high speed fuses and RC circuits.
• Output voltmeter and ammeter (with separate shunt).
• The battery of transistors for TR series.
• Control unit consisting of regulation circuits on printed circuits, auxiliary transformer and occasionally harmonic filters .
• Smoothing coil for the TH 1 series of LC filter for TR series

• All the standard supplies can be supplied on request in chassis form rather than in cabinets (see § 5)
  
• We regularly supplies regulated variable voltage or current supplies which are accurate and stable to ± 1.10-4 (and even ± 1.10-5) of the nominal value.
  
• The output voltage ripple can be reduced to a value of about 0.5 mV. This requires the use of power transistors instead of thyristors even for large power.
  
• A large number of other options are available
• A second re-inforced rate of charging (with regulated voltage and current limited or constant current).
  
• A boost-charge (following the curve W of fig. 2).
  
  Note : The change of rate can be manual / with time switch / with or without back emf cells.
  
  
  
  
• A highly efficient filter network for critical loads without battery in parallel (eg telephone).
  
• Trip indicator fuses and micro-contacts.
• Earth fault relay.
• A relay for indicating mains failure.
• A relay for indicating fault of the supplies.
• A relay for indicating under-voltage at the output.
• A relay for indicating over-voltage at the output.
• Back emf cells.
• RF. input filter
  
  
  
  

Reference number for the standard supplies

The main characteristics of our equipments are easily found in the reference number. For example 48 TH 1100 c
48 : nominal output voltage
TH : thyristor equipment (TR=transistor -)
1 : single-phase (3=three-phase)
100 : nominal output current
c : type of enclosure.