Patent ID: 11909256
Assignee: MURATA MANUFACTURING CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A switching module to output to a subsequent circuit electric power supplied from one of a plurality of power sources, the switching module comprising:
a plurality of mechanical relays coupled between the plurality of power sources and the subsequent circuit;
a plurality of semiconductor switches respectively coupled in parallel with the plurality of mechanical relays;
a voltage detector to detect an input voltage to the subsequent circuit; and
a controller configured or programmed to control connection and disconnection of the plurality of mechanical relays to electrically couple one of the plurality of power sources to the subsequent circuit; wherein
the controller is configured or programmed to:
when determining that the input voltage is abnormal during a preset first determination period, output an open command signal to open a closed mechanical relay of the plurality of mechanical relays to the closed mechanical relay, and to control, of the plurality of semiconductor switches, a semiconductor switch coupled in parallel with the mechanical relay receiving the open command signal to drive the semiconductor switch into an ON state, after the first determination period elapses;
when determining that the input voltage is normal during a preset second determination period longer than the first determination period, output a close command signal to close the mechanical relay receiving the open command signal to the mechanical relay receiving the open command signal, and to control the semiconductor switch coupled in parallel with the mechanical relay receiving the open command signal to drive the semiconductor switch into an ON state; and
when determining that the input voltage is abnormal during the second determination period, control the semiconductor switch coupled in parallel with the mechanical relay receiving the open command signal to drive the semiconductor switch into an OFF state, and subsequently output the close command signal to an open mechanical relay different from the mechanical relay receiving the open command signal of the plurality of mechanical relays.