| 摘要 |
PURPOSE:To enhance the current utilization factor of a switching element, by providing the output side of a controller having the DC voltage adjusting function of a PWM converter for enabling power to be mutually converted between AC power and DC power, with a limiter. CONSTITUTION:AC power voltage Es is applied to a full-wave rectifier circuit consisting of diodes D1-D4 and GTO thyristors G1-G4, a via a reactor ACL and is converted to direct current, and the direct current s applied to a load. From a condenser Cd connected to the load in parallel with each other, a DC voltage feedback value Ed is abstracted, and a DC voltage command value Ed* is added to find out a deviation epsiloned, and voltage adjustment AVR is performed, and an AC current command value Is* is found out via a limiter. Error current epsilonid added to actual current Is is found out, and current adjustment ACR is performed. The output of a current adjustment circuit ACR and a power-factor regulating circuit PFR is coordinate-converted PCV, and gate pulse is generated, and the gate of a GTO is controlled. As a result, the utilization factor of the current of a switching element including current determined by a limiter value is improved, and a device is miniaturized. |
