Switching power supply device and battery charger including the same

Abstract

A switching power supply device includes a full-bridge circuit comprising a plurality of switching devices, a transformer comprising a primary coil and a secondary coil, the primary coil being connected to an output of the full-bridge circuit, and a DC / DC converter comprising a rectifier circuit. The rectifier circuit includes a plurality of diodes and is connected to the secondary coil to rectify a voltage outputted from the secondary coil. A snubber circuit includes a first snubber diode connected to an intermediate point of the secondary coil, a second snubber diode connected in series with the first snubber diode, the second snubber diode being connected to one end of an output capacitor, and a snubber capacitor connected between a node between the first and second snubber diodes and a positive side output of the rectifier circuit.

Description

[0001] Cross references to related applications

[0002] This application claims the priority of Korean Patent Application No. 10-2013-0120886 filed on October 10, 2013, the entire content of which is incorporated herein by reference for all purposes. Technical field

[0003] The present disclosure generally relates to a switching power supply device and a battery charger including the switching power supply device, and more specifically, to a switching power supply device that can effectively reduce a rectifier voltage spike in a high-voltage output circuit and a battery charger including the switching power supply device. Background technique

[0004] In a switching power supply device using a snubber capacitor, the leakage inductance part of the transformer can be interlocked with the parasitic capacitor of the diode rectifier device, resulting in resonance or voltage spikes. Such voltage spikes can cause damage to the system.

[0005] The foregoing is only intended to help unders...

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