Abstract: In a compensating arrangement for a disturbed load voltage (V.sub.2, FIG. 3) of a remotely located load (20), the load voltage is fed back and combined with the voltage (E.sub.osc) of an oscillator (10A) to form an error signal (E.sub.X). The error signal is stored for a period less than one cycle of E.sub.osc by a selected period (T) and combined with the oscillator voltage (E.sub.osc) to be amplified and produce a modified output voltage (V.sub.O). The latter, when fed to the load through a distribution system (15) results in the waveform of the load voltage (V.sub.L) being substantially identical to that of the oscillator voltage (E.sub.osc).

Abstract: In a switching type DC to AC power converter a plurality (A-D, FIG. 6) of pairs of switchers (S1 and S2) are connected through inductors (L.sub.A -L.sub.D) to a load. Each set of switchers is switched to produce a square wave shaped output voltage (FIGS. 5A-5D) at a switch frequency (f.sub.S) and at a modulation percentage to produce an output voltage (E.sub.O) to a load, at a selected frequency. The sets are switched at phased delays, so that the ripple currents through them, when summed up, result in a ripple current I.sub.T at a frequency f.sub.C, where f.sub.C =n.multidot.f.sub.S, n being the number of pairs of switchers. In another aspect of the invention, means are incorporated to prevent the flow of currents between parallel connected amplifiers, characterized by zero output impedances.

Abstract: A regulated DC to AC power converter of the switching type for providing AC power at a selected output frequency, e.g., 50 Hz, is disclosed. The converter, which eliminates the need for an inverter transformer, is switched at a switching frequency which is considerably higher than the output frequency, e.g., 10 KHz. Due to the high switching rate the converter filter can be designed with small and lightweight components to provide a desired pass band, which includes the output frequency and harmonics thereof, and provides sufficient attenuation for the switching frequency and its higher harmonics, so as to produce an output with very low ripple or waveform distortion. Due to the high switching frequency the output waveform can be regulated with a response time of a fraction of a cycle. The converter includes a modulator section with a unique arrangement to control the switching of the switches between their On and Off states.

Abstract: An AC power source characterized by the absence of a step-up output transformer is disclosed. The power source, which includes first and second output terminals across which a load is connected, is designed to provide AC power at a desired output voltage, e.g., 130v rms up to a desired current rating, e.g., 8 amperes. The source includes a first unit which includes a first voltage amplifier associated with positive and negative current amplifiers of substantially unity voltage gain, which provide power at the first output terminal up to the rated current at a voltage of 65v rms. Direct feedback is provided to the first voltage amplifier from the first output terminal, to which the load is connected. The source includes a second unit identical to the first unit, which includes a second voltage amplifier associated with positive and negative current amplifiers of substantially unity voltage gain, which provide power at the second output terminal up to the rated current at a voltage of 65v rms.