| 摘要 |
A power supply system includes a switching power supply. The switching power supply includes an overcurrent detection circuit. The overcurrent detection circuit includes a current detecting resistor, a reference voltage generation circuit, and a comparison circuit. The current detecting resistor is provided on a secondary side of a transformer. The reference voltage generation circuit generates a first reference voltage when an output voltage of the switching power supply is a first output voltage and a second reference voltage lower than the first reference voltage when the output voltage is a second output voltage. The comparison circuit detects an overcurrent by comparing a voltage across the current detecting resistor with the first reference voltage or the second reference voltage. |
