A voltage or power conditioning and control device may be used in line with a source of AC line power (11, 12) and a reactive load (13) such as a single-phase induction motor. The device operates to absorb some of the power reflected by the AC load and generate a synthetic power wave to supplement and correct the applied power in level and phase. The device employs a pair of power capacitors (C1, C2) and a pair of electronic switch devices (Q1, Q2) each with a diode (D1, D2) in parallel. Gating or command signals ( Figs. 2A, 2B , 2C ) are generated based on the line voltage and timing, e.g., zero crossings. The phase or timing of the command signals is selected for a normal or no-boost mode, a voltage boost mode, or a voltage reduction mode. The capacitors are considered in series with the load, and improve the power factor to the load. A variation of this device may be used in conjunction with a solar array or other local power source.
