Abstract: An SMA wire driving device, a closed-loop control method thereof and an electronic device are provided, which relates to the technical field of actuators. The SMA wire driving device includes a stationary part, a movable part being movable relative to the stationary part, and an SMA wire configured to drive the movable part to move relative to the stationary part, where a sampling resistor is connected in series with the SMA wire. By the SMA wire driving device, a displacement of the movable part relative to the stationary part can be detected by acquiring a voltage of the sampling resistor connected in series with the SMA wire. Based on the SMA wire driving device, a closed-loop control method is further provided, which has a small computation amount, so that the SMA wire can be rapidly controlled, improving driving effect of the SMA wire driving device.
Abstract: A lens module and an electronic device are provided. The lens module includes: a bearing portion; and at least two groups of SMA actuating structures, and each group is connected to the same side portion or different side portions of the bearing portion, and includes: a driven member fixedly provided at a side portion of the bearing portion; a first contact plate, two ends of a first SMA wire are each electrically connected to the first contact plate, and a middle portion of the first SMA wire is in contact with the driven member; and a second contact plate, two ends of a second SMA wire are each electrically connected to the second contact plate, and a middle portion of the second SMA wire is in contact with the driven member; the driven member is movably mounted between angles formed by the first SMA wire and the second SMA wire being bent.