A METHOD OF IMPROVING THE OUTPUT CHARACTERISTICS OF ELECTRIC-POWER SUPPLIES

As we know, the output parameters of linear voltage and current stabil izers (LVS) are far superior to those of pulsed stabilizers. However, in spite of the advantages of the latter in terms of size and weight, there are no alternatives to LVS's for measurement circuitry, operatio nal amplifiers, and in designing reference voltage sources. Current st abilization one-ports (CSO) - nonlinear elements with different resist ances to variable ac. and d.c. currents - are used in the load network of the feedback amplifier to improve the performance characteristics (increase the stabilization coefficient K(st) and reduce the output re sistance R(out)) of LVS's with the control element (CE) both in parall el and in series. Research on such LVS's with single-stage and differe ntial d.c. amplifiers (DCA) with different types of current-stabilizat ion one-ports [1-4] have shown that the output characteristics of the power sources depend very much on the structure and connection points of the current stabilization one-ports. Table 1 shows several types of CSO's together with their connection points in place of R(con) in can onical LVS structures. A theoretical analysis of CSO circuits taking i nto account the features of nonlinear circuit analysis has made it pos sible to obtain simplified relations for calculating the parameters (s ee Table 2) and for testing the convergence of calculation and experim ent (see Table 3). Stabilizers with the control elements in parallel c ompared to stabilizers with the control elements in series are simpler in design, and have a simpler current overload protection element [4] . Research on CSO structures has revealed that such devices can be use d to obtain quite satisfactory characteristics for stabilizers with CE 's in parallel as well. One design version of a parallel LVS with a CS O, whose design is shown in Table 1 (version 18), provides satisfactor y results compared to a series LVS and an analogous CSO: for a paralle l LVS with U(in) = 30-36 V; U(out) = 27 V; I1 = 0. 1-0.5 A we have K(s t) = 2.23 x 10(23); R(out) = 2.1 x 10(-3) OMEGA; for a series LVS with analogous input and output parameters and components: K(st) = 0.49 x 10(4); R(out) = 2.1 X 10(-3) OMEGA. Moreover, the series LVS with a si ngle-stage DCA and CSO (version No. 1) with analogous parameters has K (st) = 10(3) and R(out) = 4.7 x 10(-3) OMEGA. Therefore, the use of CS O's in power supply designs makes it possible to improve their output characteristics.