Patent ID: 11929701
Assignee: CANON KABUSHIKI KAISHA
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  B | IPC B  H

Claim 14:
15. A non-transitory computer readable storage medium storing a program for causing a computer to function as an electronic apparatus,
wherein the electronic apparatus comprises:
a motor that is driven based on a current supplied from a power source;
a detection circuit that detects an instantaneous interruption of the power source;
a plurality of H bridge circuits each having an upper arm circuit having two switching elements connected in parallel to the power source and a lower arm circuit having two switching elements connected in parallel to a ground, the upper arm circuit and the lower arm circuit being connected, each of the plurality of H bridge circuits controlling the current to be supplied to the motor, with a diode being connected in parallel to each of the switching elements; and
a switching control circuit that controls the switching elements for the plurality of H bridge circuits,
wherein, in a case where the instantaneous interruption of the power source is detected by the detection circuit, the switching control circuit sets the switching elements of the upper arm circuits to off and sets the switching elements of the lower arm circuits to on by asserting a stop signal irrespective of a level of a phase signal, whereby the current flows through the switching elements in the lower arm circuits without flowing through the diodes in the lower arm circuits, and
wherein, in a case where a recovery to a normal state of the power source is detected by the detection circuit, the switching control circuit performs PWM control to drive the plurality of H bridge circuits based on the phase signal by negating the stop signal.