Abstract: Disclosed is a direct current (DC) to alternating current (AC) converter (5) that receives a direct current signal from an input power source (10) to drive a load (2). A power module (16), controlled by a central processing unit (CPU) (14), includes a DC-to-DC voltage booster (20) that boosts the direct current signal from approximately 12 volts to 150 volts. A DC-to-AC inverter (70), which is also controlled by the CPU, converts the boosted DC voltage from DC to a 60 Hz AC output signal (18) used to drive the load. The power module includes a voltage feedback path and a current feedback path for regulating the AC output voltage signal in response to changes in the load (12). The voltage feedback path includes a fast integrator (36) connected in parallel with a slow integrator (34).

Abstract: An apparatus providing a source of alternating power for power devices is disclosed. The apparatus comprises a frame member having a plurality of ground engaging wheels for transporting the frame member along the ground. The frame member carries a plurality of DC storage means therein. A transformer means carried on the frame has a low voltage center tapped winding, a line voltage winding, and a high voltage winding. The low voltage center tapped winding is in communication with the DC storage means, and the line voltage winding is operable to produce an AC output voltage suitable for powering devices. A plurality of controllable rectifier means is in communication with both the high voltage winding and the low voltage center tapped winding. The rectifier means are operable to alternately provide a conduction path for said DC storage means through both halves of the low voltage center tapped winding.

Abstract: An electrical power unit adapted to increase the DC power output of an electrical generating system of the type including a DC storage battery and an alternator which delivers AC voltage to the generating system. The AC voltage is stepped down and rectified to produce a first DC voltage. A voltage regulator having a field output connected to the field winding of the alternator, and an input connected to the battery and the first DC voltage, is operative to control the field winding of the alternator to maintain the first DC voltage at a relatively constant level. The first DC voltage may be applied to the battery to supply power thereto and to any load which may be connected to the battery. Increased power is provided when the regulator forces the alternator to produce AC voltage at a higher than normal voltage. When this higher voltage is stepped down and rectified to provide normal system DC voltage, greater than normal DC power is provided.