US 12,282,244 B2
SMA wire driving device, closed-loop control method thereof and electronic device
Shulun Liu, Guangdong (CN); Shubiao Ji, Guangdong (CN); and Yaoqian Cai, Guangdong (CN)
Assigned to HENAN HOZEL ELECTRON INC., Henan (CN)
Appl. No. 17/795,007
Filed by Henan Hozel Electron Inc., Henan (CN)
PCT Filed Aug. 11, 2021, PCT No. PCT/CN2021/111989
§ 371(c)(1), (2) Date Jul. 25, 2022,
PCT Pub. No. WO2022/267195, PCT Pub. Date Dec. 29, 2022.
Claims priority of application No. 202110697621.X (CN), filed on Jun. 23, 2021.
Prior Publication US 2024/0219813 A1, Jul. 4, 2024
Int. Cl. G03B 13/36 (2021.01); G02B 7/09 (2021.01); G02B 27/64 (2006.01)
CPC G03B 13/36 (2013.01) [G02B 7/09 (2013.01); G02B 27/646 (2013.01); G03B 2205/0076 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A closed-loop control method for a shape memory alloy (SMA) wire driving device, wherein the SMA wire driving device comprises an SMA wire pair, a sampling resistor, a movable part, and a stationary part, comprising:
acquiring a first voltage V1 of the sampling resistor when the sampling resistor is connected in series with only a first SMA wire in the SMA wire pair;
acquiring a second voltage V2 of the sampling resistor when the sampling resistor is connected in series with only a second SMA wire in the SMA wire pair;
acquiring a current voltage reciprocal difference of the sampling resistor according to the first voltage V1 and the second voltage V2, wherein the current voltage reciprocal difference is

OG Complex Work Unit Math
acquiring a target voltage reciprocal difference of the sampling resistor according to a target displacement, wherein the target displacement represents a displacement to be made by the movable part to move to a predetermined position relative to the stationary part;
acquiring a deviation of the current voltage reciprocal difference from the target voltage reciprocal difference; and
when the deviation is greater than a threshold value, repeatedly adjusting driving signal applied to the SMA wire pair and acquiring the current voltage reciprocal difference in response to the adjusted driving signal, until the deviation is less than the threshold value.