| 摘要 |
PURPOSE:To obtain an inexpensive and economic control power source by using a photocoupler to detect an output voltage, and forming the function of fourquadrant calculations of an operational amplifier. CONSTITUTION:An AC power source 1 is converted by a rectifier 2 to a DC, smoothed by a condenser 3, and supplied to a load 4. A switch element 5 is connected in parallel with a rectifier 2A, and an energy from a load side is regenerated to a power source 1 side. Further, the R-phase, S-phase current reference I*R, I*S are compared by current controllers 13A, 13B with current detection signals IR, IS from current detectors 7A, 7B of the phases, and controlled to a target voltage VSR while controlling the current with switch elements 5 to 100% of power factor. In this case, current reference generators 24A, 24B and a voltage controller 23 are provided, a photocoupler for detecting the output voltage Vc is provided in the controller 23, a triangular wave signal VTR is compared with an error signal, and a pulse-width-modulated pulselike switching signal VSW is output to the generators 24A, 24B. |
