Abstract: An adjustable output transformer using a pair of adjacent facing pot cores, the first of which carries both primary and secondary windings, the second having only a shorted winding around one leg. The shorted winding inhibits flux through its leg and the corresponding portion of the adjacent leg on the first core so that the secondary voltage may be varied by adjusting the relative rotational positions of the two cores and hence the amount of flux linking the secondary winding.

Abstract: A programmable negative resistance circuit, transformer coupled to the low-voltage high-current output conductors of the center-tapped secondary winding of a switching power supply transformer, maintains a constant voltage output irrespective of large load current variations.

Abstract: Pulsewidth determining circuitry for switching regulator power supplies employs a saturable reactor current comparator that controls a circuit that switches off the primary current whenever it instantaneously exceeds a value dependent upon a control signal derived from the power supply D.C. output level.SUMMARY OF THE INVENTIONRecent power supply improvements include the development of the highly efficient switching regulator power supplies which dissipate a minimum of electrical power and therefore obviate the need for the complex cooling schemes normally required by the more conventional regulators that operate by dissipating substantial amounts of power to achieve the desired output level. Switching regulators are generally voltage regulating circuits which sample the regulator output voltage, compare it with the voltage reference, and use the error voltage to control the on-time to off-time ratio of an electronic switch in series between an unregulated D.C.

Abstract: A switching regulator power supply with an auto transformer in the output of the main transistor switch, the secondary of which feeds back a back biasing pulse to the main transistor switch base/emitter junction thus speeding up transistor turn off.