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

Claim 7:
8. A control method of an electronic apparatus, the electronic apparatus comprising:
a motor that is driven based on a current supplied from a 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 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 element for the plurality of H bridge circuits,
the control method comprising:
detecting an instantaneous interruption of the power source; and
setting, by the switching control circuit, in a case where the instantaneous interruption of the power source is detected, the switching elements of the upper arm circuits to off and setting 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,
performing, by the switching control circuit, PWM control to drive the plurality of H bridge circuits based on the phase signal by negating the stop signal in a case where a recovery to a normal state of the power source is detected by the detection circuit.