Sanken Electric Co., Ltd.

Hiroyuki Chikashige

Mizuki Utsuno

Tetsuya Niijima

Hiromi Koiwai

Yoshikazu Takahashi

In a direct-current power supply device that includes a smoothing capacitor C, which performs a DC/DC converter operation, a transformer T, a switching element Q, a diode D, a smoothing capacitor C, a reactor L, which performs a PFC operation, a fast recovery diode Dand a switching element Q, when compared with the case of a rated load, the voltage of the smoothing capacitor Cof a PFC circuit rises at a time when a load is light. Therefore, the following has been required: a capacitor having a sufficient withstanding voltage rating, or an operation of connecting a plurality of capacitors in series or any other operation to secure a voltage-withstanding capability. A direct-current power supply device, in which a switching element Qused by a PFC circuit is shared as a switching element Qby a DC/DC converter, includes voltage suppression means (switching elements Qand Qand resistance R) for supplying electric charge accumulated in a smoothing capacitor Cto a power supply Vcc of a control circuit CTLthat controls the switching element Qat a time when a load is light in order to suppress a rise in voltage in the smoothing capacitor C

Direct current power supply device

A DC power source apparatus has a DC power source for supplying a DC voltage, a transformer, and a switching element connected to a primary winding of the transformer. The switching element carries out ON/OFF operations to convert the DC voltage from the DC power source into high-frequency power, which is transferred to a secondary winding of the transformer and is converted into a DC output voltage. The primary winding of the transformer consists of a first primary winding made of a plurality of winding layers and a second primary winding made of a plurality of winding layers. The first and second primary windings are connected in parallel. The first primary winding is arranged on an inner side of the secondary winding, and the second primary winding is arranged on an outer side of the secondary winding. A terminal of a winding layer farthest from the secondary winding among the winding layers of each of the first and second primary windings is connected to the switching element.

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Niiza, Japan

Hiroyuki Chikashige