JPS63149188U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a diagram showing the detailed configuration of the current detection circuit in FIG. 1, and FIG. 3 is a diagram showing the operation of the current detection circuit in FIG. 2. This is a time chart for explanation. VDC: DC power supply, T: Transformer, Q1, Q2
: Transistor, 1: Control circuit, D1, D2: Diode, L, L1, L2: Smoothing reactor, 2
: Current detection circuit, RL: Load, R1 to R6: Resistor, 3: Comparator.

Claims (1)

[Claims for Utility Model Registration] In a smoothing circuit that smoothes a rectified output obtained by rectifying an alternating current voltage via a smoothing reactor, the smoothing reactor is constructed as a series circuit of a plurality of individual reactors, and at least the individual reactors a short-circuit circuit that short-circuits one of the short-circuit circuits, further comprising: opening/closing means for opening and closing the short-circuit circuit; current detection means for detecting current flow in an individual reactor that does not have the short-circuit circuit among the individual reactors; 1. A smoothing circuit for rectified output, comprising switching control means for switching the short circuits to close or open via the switching means depending on whether or not the current exceeds a predetermined value.