This paper advances a novel voltage driven synchronous rectifier (SR) in which driving voltage is coupled from output filter voltage.

The pulse width modulation character of voltage drive -type pulse width modulator TL494 is introduced.

Based on the theory of the ink jet printer, the plasma is spewed on leather uniformly and accurately by using piezoelectric actuator.

The simulation of piezoelectric actuator effect of the micropump is in accord with the results of the test.

Put forward making use of the piezoelectric element at the condition of electrify producing micro displacement principle to design piezoelectric actuator,the paper utilized the piezoelectric actuator to design the cell micro injection device which achieved its orientation and injection by the piezoelectric actuator.

Based on the principle of piezoelectric drive,we make an explorative study of a novel feeding device with vibration of high frequency and low amplitude.

Study of actuation voltage of broadband RF-MEMS switches;

In order to depress actuation voltage of RF MEMS switches,based on theories of torsion mechanics and deform mechanics,this paper puts forward the model of RF MEMS switches using torsion spring,establishes mathematical formula and technological process,simulates electromechanical performance of the switches with the different shapes.

DC measurements indicate actuation voltage as low as 20 V is achieved.

Key factors for micro-displacement resolution of piezoelectric actuators are systematically summarized in following two aspects: intrinsic(hysteresis;creep deformation) and extrinsic(environment;control power;pretightening force;guide mechanism etc.