| 摘要 |
<p>Provided is a current measuring technology wherein influence of switching noise is suppressed. A technology disclosed by the present description is a current sensor which measures an output current of a switching circuit. The current sensor is provided with a magnetic optical element disposed at a current measuring point, a light source for radiating light to the magnetic optical element, and a light receiver that receives light passed through or reflected by the magnetic optical element. The light source radiates light in synchronization with carrier signals of the switching circuit. The light source radiates the light in synchronization with the carrier signals, and measures the current using the light. Since the light is synchronized with the carrier signals, the current can be measured at timing other than switching timing due to PWM signals generated on the basis of the carrier signals.</p> |
