Patent ID: 6940188
Filing Date: 2005-09-06
Classification: H02J,H02M,Y02B

Abstract:
1. An electric power converting device comprising: a first switching element series circuit comprising first and second semiconductor switching elements connected in series, each with a diode in inverse-parallel connection; a second switching element series circuit comprising third and fourth semiconductor switching elements connected in series, each with a diode in inverse-parallel connection; a third switching element series circuit comprising fifth and sixth semiconductor switching elements connected in series, each with a diode in inverse-parallel connection; a first capacitor; a second capacitor connected in parallel to an AC power source; a third capacitor connected in parallel to a load; a first reactor; and a second reactor, wherein the first, second, and third switching element series circuits and the first capacitor are connected in parallel to one another, wherein one end of the AC power source and one end of the load are connected to each other, wherein a series connection point of the first and second semiconductor switching elements of the first switching element series circuit is connected to the one end of the AC power source through the first reactor, wherein a series connection point of the third and fourth semiconductor switching elements of the second switching element series circuit is connected to the other end of the AC power source, wherein a series connection point of the fifth and sixth semiconductor switching elements of the third switching element series circuit is connected to the other end of the load through the second reactor, wherein the second and third switching element series circuits form a series converter, which compensates a change in voltage of the AC power source to supply a constant voltage to the load, and wherein the first and second switching element series circuits form a parallel converter, which compensates a change in voltage of the first capacitor due to the compensating operation of the series converter by a charging and discharging operation between the AC power source and the first capacitor.