Patent ID: 9069537
Filing Date: 2015-06-30
Classification: G06F,H05K

Abstract:
1. A power supply switching apparatus for switching a power supply for supplying power to a load between a first power supply and a second power supply, the power supply switching apparatus comprising: a controller including a first comparator connected to either one of the first power supply and the second power supply, and configured to output a binary signal having a level corresponding to a magnitude of a signal input from the power supply being connected thereto, an integrator circuit configured to integrate an output from the first comparator, and a second comparator configured to output a binary signal having a level corresponding to a magnitude of a single input from the integrator circuit; and a switch having an input side connected to the first power supply and the second power supply, and configured to switch an outputting current between a current supplied from the first power supply and a current supplied from the second power supply in accordance with a value of the signal output from the second comparator wherein the power supply switching apparatus is connected to an alternating-current power supply, the controller further includes a rectifier circuit configured to rectify an input signal, and a high-pass filter configured to reduce a frequency component at or below a specific frequency in the signal rectified by the rectifier circuit, and the first comparator receives an output from the high-pass filter.