| 摘要 |
<p>Provided is a power circuit capable of supplying an output voltage lower than or higher than an input voltage to a direct-current load utilizing a simple circuit configuration without any special circuitry being provided. The power circuit (10) is equipped with a power supply circuit which has a transformer (Tr), a rectifying diode (D1), a primary capacitor (C1) and a secondary capacitor (C2), and with a switching element (Q). An LED series circuit (40) is driven by a direct current from the primary capacitor (C1) when the switching element (Q) is on, and is driven by a direct current from the secondary capacitor (C2) when the switching element (Q) is off. The primary capacitor (C1) is charged by the transformer (Tr) when the switching element (Q) is off.</p> |
