ELECTRONIC APPARATUS PREVENTING ERRONEOUS DETECTION OF SENSOR OUTPUT DUE TO AC LINE NOISE AND ERRONEOUS DETECTION PREVENTION METHOD

摘要

Provided is an electronic apparatus that can prevent erroneous detection of a sensor output due to an AC line noise. A power supply circuit includes a noise filter, input rectifying smoothing circuit, converter circuit, and output smoothing circuit. The input rectifying smoothing circuit rectifies an input AC voltage passed through the noise filter to a pulsating flow and then smooth it. The converter circuit converts a DC voltage rectified and smoothed into a desired output voltage. The output smoothing circuit smoothes the convert output voltage to supply it to a control part. The noise determination part detects a noise that could not have been removed by the noise filter, as an AC line noise. The control part invalidates a detection signal outputted from the sensor for a previously set invalid period from the moment the AC line noise has been detected.

主权项

1. An electronic apparatus provided with a sensor and a control part, the control part performing control on the basis of a detection signal outputted from the sensor, the electronic apparatus comprising:
a power supply circuit, supplying power to the control part, and a noise determination part, detecting an AC line noise generated in a power supply line from the power supply circuit to the control part, the control part invalidating a detection signal outputted from the sensor for a previously set invalid period of time from the moment when the AC line noise having been detected by the noise determination part.