| 摘要 |
An SMPS(Switching Mode Power Supply) circuit using a single transformer is provided to reduce a material cost by reducing the number of peripheral components for driving a transformer. An SMPS circuit includes a multi-stage(210), a PFC(Power Factor Control) stage(220), and a power control stage(230). The multi-stage includes a single transformer and outputs a standby voltage and a plurality of different voltages. The PFC stage is connected to the multi-stage and controls power supplied to the multi-stage. The power control stage is connected to the PFC stage and controls the PFC stage by a power control signal(PS) applied from the outside. The multi-stage includes a trans unit(211), a first rectification unit(212), a trans controller(213), a first regulator(214), a second regulator(215), a switching device(217), a regulator control unit(216), and a filter unit(218).
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