Research On A Wireless Remote Control Powered With Piezoelectric Generator

The remote control widely used in home appliances, automotive, industrial andmilitary equipment control, has become an indispensable portable electronic productin modern life. Now the remote control is powered by battery and the failure ofcontrol and safety accidents may be caused by the exhaustion of the electric energy; inaddition, the battery production and discard results in the waste of resource andpollution to the environment. So, various power generators (solar, electromagneticpiezoelectric, etc) were introduced to supply energy to the remote control and thepiezoelectric materials become an ideal energy source for the self-powered remotecontrol with its excellent electromechanical characteristics. In view of the lowerpower generation of the piezoelectric-generator and the higher power consumption ofthe current remote control, theoretical analysis and experiments will be implementedto improve the piezoelectric-generator and lower the power consumption of thewireless remote control.Specific researches as follows:1. Using the mechanics and the piezoelectricity knowledge, the theoreticalmodel analysis and numerical simulation were carried on to the piezoelectriccantilever generator and the piezoelectric simply-supported beam generator and theinfluence of the structural/performance parameters and the external force on thereliability and performance of the generators was analysed.2. An innovative constant-stress piezoelectric cantilever generator (CSPCG)with a circular arc deflection-limiting device was introduced. The model of thegenerator was set up and the expressions of the open-circuit voltage, electric chargeand energy were deduced. By way of software MATLAB numerical and graphics tool,the constant-stress piezoelectric cantilever generator was compared with thetraditional piezoelectric cantilever generator and the electric energy ratio, the ultimatestress ratio and the end deflection ratio of the two generators were deduced andanalysed. According to the analyses above, the Young modulus ratio and thicknessratio are two key factors affecting the piezoelectric power generation and there aresuitable values for them to improve the performance of the generators；in the samecondition, the constant-stress piezoelectric cantilever generator demonstrates better performance and higher reliability than the traditional piezoelectric cantilevergenerator. Experiment about the influence of the circular arc deflection-limitingdevice radium and thickness ratio on the open-circuit voltage of the CSPCG wascarried on to prove the theory of the generator.3. The piezoelectric cantilever frequency characteristics were analysed,including the amplitude, phase and open-circuit voltage Characteristics; by way ofsoftware ANSYS10.0, relationship between the resonant frequency and the structuralparameters of the piezoelectric cantilever was acquired; the piezoelectric cantileveroutput voltage/power was discussed, including the piezoelectric cantilevers in series/parallel connection and the piezoelectric cantilever connected with the RectifierBridge and resistance; to validate the theoretical analyses above, experiments weredesigned and executed and the theories proved to be correct.4. The piezoelectric self-powered wireless system was discussed and alow-powered wireless transmitting/receiving system was introduced. In the conditionof the reliable receiving, the wireless transmitting power consumption was quantifiedand reduced through the hardware and software.5. A new performance testing method for the piezoelectric self-powered wirelessremote control was introduced. The piezoelectric self-powered wireless remotecontrol was fabricated and the on-line test of the generators and the wireless printcircuit board was carried on. According to test results, the constant-stresspiezoelectric cantilever generator has the better performance than the piezoelectricsimply-supported beam generator.