遥控器用压电发电装置的供电特性

提出利用压电发电装置替代电池为遥控器提供实时的能量供应。针对遥控器的操作方法和负载特性，提出采用脉冲激励和按压激励压电振子的实施方案，通过试验的方法研究了压电振子在两种激励方式下对恒流负载的供电特性。结果表明，脉冲激励可获得更多的电能，适合于较大负载的工作场合。压电振子固有频率一定时，其有效的工作时间随电流负载增加而缩短；电流负载一定时，存在最佳的压电振子固有频率使其有效供电时间最长。利用尺寸为50x50x0.5mm的悬臂梁型压电振子为汽车遥控器供电，1次脉冲激励生成的电能可满足汽车遥控器信号发射的功率需求，信号传输距离达到15米以上。

Power-supply performance of a piezoelectric generator for remote controls

A piezoelectric electrical-energy generator was presented to provide endless and real-time electrical energy for remote controls. In view of the operation method and load performance of remote controls, pulse-excitation and press- excitation were utilized to impulse a piezoelectric cantilever generator to generate electrical energy. The influence of the two exciting methods on electrical energy generation and effective duration of power supply (EDPS) to constant current load was investigated experimentally. The results show that the piezoelectric generator achieves more electric energy and longer EDPS under pulse-excitation than that under press-excitation. When pulse-excitation is used, the EDPS decreases with the increasing of the current load, and there is an optimal natural frequency for the piezoelectric generator to achieve the longest EDPS. The electrical energy from the piezoelectric generator measured 40x15x0.5mm is available for a car remote control to sent signals successfully, and the information-transfer distance is up to 15m.