Importance

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Abstract

The present invention relates to an electric power unit with a condenser input type rectification circuit which converts an alternating current power source to a direct current voltage, and more particularly, to an electric power unit for inverter-controlled refrigerators. An electric power unit according to the present invention feeds electric power to a load (7), which comprises an alternating current power source (1), a bridge-type rectification circuit (2) having an input from the alternating current power source (1) and consisting of bridge-connected diodes (D1, D2, D3, D4), an auxiliary capacitor (3) connected in parallel to an output of the bridge-type rectification circuit (2), a series circuit of a reactor (4) and a diode (5) connected between one output of the bridge-type rectification circuit (2) and the load (7) so as to flow a load current in a forward direction, and a smoothing capacitor (6) connected in parallel to the load (7). Moreover, the reactor (4) is constituted of a first reactor (42) and a second reactor (43) a capacity of which is made variable through controlling of a parallel connection of the second reactor (43) to the first reactor (42) by a switching means (44) in accordance with a change of a current running in the first reactor (42) or a change of an environment where the first reactor (42) is used.

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First Claim