| 摘要 |
A power supply circuit for transforming a direct-current voltage into an alternating-current voltage for a light source is provided. The power supply circuit includes a drive circuit, a switch, a transformer and a capacitor. The switch has a control terminal coupled to the drive circuit and a ground terminal coupled to a ground. The transformer has a primary side and a secondary side, and a winding on the primary side is coupled between the direct-current voltage and a signal terminal of the switch to generate the alternating-current voltage on the secondary side. The capacitor is coupled between the ground terminal and the signal terminal of the switch.
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