Electric-power conversion system

摘要

The number of constituent components is reduced so as to provide a small-size and inexpensive electric-power conversion system. The electric-power conversion system is provided with an inverter circuit (14) connected with the rear stage of an AC power source, a smoothing capacitor (22) connected with the rear stage of the inverter circuit (14) by way of a rectifying device (20), a charging switch (2) that is connected with the front stage of the inverter circuit (14), that inputs an electric quantity based on an output of the AC power source (1) to the inverter circuit (14) when being turned on, and that cuts off an input of the electric quantity to the inverter circuit (14) when being turned off, and an inrush current prevention circuit (7) having an inrush current prevention switch (3) and an inrush current prevention resistor (4) that is connected in series with the rear stage of the inrush current prevention switch (3); the electric-power conversion system is characterized in that the inrush current prevention circuit (7) is connected in parallel with the charging switch (2).

主权项

1. An electric-power conversion system comprising:
a diode bridge connected to an AC power source; an inverter circuit connected with a rear stage of the diode bridge; a smoothing capacitor connected with a rear stage of the inverter circuit via a rectifying device; a charging switch that is connected with the rear stage of the diode bridge and a front stage of the inverter circuit, that inputs an electric quantity based on an output of the AC power source to the inverter circuit when being turned on, and that cuts off an input of the electric quantity to the inverter circuit when being turned off; an inrush current prevention circuit connected in parallel with the charging switch and having:
an inrush current prevention switch connected with the rear stage of the diode bridge, andan inrush current prevention resistor that is connected with the front stage of the inverter circuit and connected in series with a rear stage of the inrush current prevention switch; and a discharging switch, one terminal of which is connected between the inrush current prevention switch and the inrush current prevention resistor and other terminal of which is connected with one terminal of the smoothing capacitor, wherein the discharging switch connects the one terminal of the smoothing capacitor with the front stage of the inrush current prevention resistor when being turned on and disconnects the one terminal of the smoothing capacitor from the front stage of the inrush current prevention resistor when being turned off.