Abstract: A bio-based moisture absorption and sweat discharging multifunctional finishing agent and a preparation method and application thereof is provided, a structural formula of which is: wherein, R1 is linear or branched alkyl; R2 is derived from bio-based polyethylene glycol, with a molecular structure of —(CH2CH2O)n—H, n=22˜91, and n is a natural number; a=60˜150, and a is a natural number; b is a natural number; the molar ratio of structural units with a degree of polymerization of a to those with a degree of polymerization of b is (30˜85):(15˜40). Its use in the after finish of hydrophobic fiber fabrics can improve their water absorption and anti-static properties, giving them a laundering durable effect and a fluffy and soft feel.

Abstract: A switched capacitor charge pump driver for piezoelectric actuator includes a power source, a first switching capacitor and a piezoelectric actuating circuit, wherein during being at a first state, the first capacitor is charged by the power source; during being at a second state, the first capacitor is discharged to the piezoelectric actuator in the actuating circuit. The switched capacitor charge pump driver for piezoelectric actuator can expand the application of charge controller to a broader frequency range, especially at low frequencies and effectively decrease the hysteresis of piezoelectric stack over a large frequency range even at a quasistatic state. In addition, a method for driving piezoelectric actuator by a switched capacitor charge pump is provided.

Abstract: A switched capacitor charge pump driver for piezoelectric actuator includes a power source, a first switching capacitor and a piezoelectric actuating circuit, wherein during being at a first state, the first capacitor is charged by the power source; during being at a second state, the first capacitor is discharged to the piezoelectric actuator in the actuating circuit. The switched capacitor charge pump driver for piezoelectric actuator can expand the application of charge controller to a broader frequency range, especially at low frequencies and effectively decrease the hysteresis of piezoelectric stack over a large frequency range even at a quasistatic state. In addition, a method for driving piezoelectric actuator by a switched capacitor charge pump is provided.