Power supply with multiple outputs and load balancing

DETAILED DESCRIPTION OF THE INVENTION With reference to FIG.
3, a prior art power supply connects in parallel the outputs of two or more power converters (1, 2) with multiple outputs (10, 11, 20, 21) while endeavoring to guarantee equitable sharing of the output currents between the converters.
This is the case when the goal is to connect in parallel the similar output voltages corresponding to outputs (10, 20) for the two converters (1, 2) and outputs (11, 21) for these same converters while attempting to guarantee equitable sharing of the current furnished by these outputs as a function of the different loads (Z.
sub.
1) connected in parallel to outputs (10, 20) and (Z.
sub.
2) connected to outputs (11, 21), respectively.
As shown in FIG.
3, it is possible to regulate the output current (Is.
sub.
11) supplied by the first output (10) of first converter (1) and the output current (Is.
sub.
21) supplied by the first output (20, similar output) of the second converter (2) by control circuit (3).
This control circuit supplies the first command signal (C.
sub.
1) that controls the device that cuts off the supply voltage (V.
sub.
e) of the converter (1) available at input terminals (12) of this converter and a second command signal (C.
sub.
2) that also controls the circuit that cuts off the supply voltage (V.
sub.
e) present at input terminals (22) of second converter (2).
This circuit (3) is composed of a first subtraction device (30) receiving at its negative input the voltage signal (Vs.
sub.
1) corresponding to the voltage at the terminals of the first load (Z.
sub.
1) and at its positive input a reference voltage signal (V.
sub.
ref).
The output of this first subtractor (30) is sent to an error amplifier circuit (31) which amplies the error signal and whose output is connected to each of the positive inputs of the other two subtraction circuits (32, 33).
The negative inputs of these subtraction circuits (32, 33) receive respectively a signal (Is.
sub.
11) that represents the current delivered by the first output (10) of the first converter to the load (Z