JPS6437384U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a configuration block diagram showing an embodiment of the present invention, Fig. 2 is a relationship diagram between current and inductance, and Fig. 3 is a waveform diagram of switch current, where A is the rated current,
B indicates the peak current. Fig. 4 is a circuit diagram of a conventionally known switching power supply, Fig. 5 is a graph of load current from motor startup to steady state, and Fig. 6 shows inductance L on the vertical axis and current Idc on the horizontal axis. The graph shown in FIG. 7 is a waveform diagram of the switch current with respect to the peak current exceeding the allowable current. L1, L2...Inductor, C...Capacitor, T...Transformer, V1...Input primary voltage, V0
...Output voltage.

Claims (1)

[Claims for Utility Model Registration] A transformer having a primary winding and a secondary winding, a switch element that turns input primary voltage on and off to the primary winding, and an alternating current obtained in the secondary winding. In a switching power supply device comprising a rectifier that rectifies current, and a smoothing circuit that smoothes the current rectified by the rectifier and supplies it to a load within a rated current range, the smoothing circuit has a tolerance approximately equal to the rated current. a first inductor having a current and a high inductance; a second inductor having a low inductance and having an allowable current larger than the peak current of the load connected in series with the first inductor; An output smoothing circuit for a switching power supply device, comprising an inductor and a capacitor connected in series.