Piezoelectric charging system and electronic device using same
The present disclosure relates to a piezoelectric charging system, which has two operational modes: a vibration mode and a charging mode. The system includes a piezoelectric vibrator, a driving module, a switch selecting module, a rectifying and processing module and a charging control module. The present disclosure can make full use of the mechanical energy from human beings and the ambient environment to provide the electronic device with an important energy source. Furthermore, energy can be charged to the electronic devices in real time. Furthermore, the present disclosure provides a terminal device using the piezoelectric charging system.
1. A piezoelectric charging system, having two operational modes including a vibration mode and a charging mode, the system comprising:
a piezoelectric vibrator for converting the electric energy into the mechanical energy in the vibration mode and converting the mechanical energy into the electric energy in the charging mode;
a driving module for driving the piezoelectric vibrator to vibrate in the vibration mode;
a switch selecting module for controlling the piezoelectric charging system to select whether the vibration mode or the charging mode is used, wherein the switch selecting module further comprises a communication control module for receiving a control signal and convert the control signal into a switch control signal, a control level latching module for latching the switch control signal of the communication control module and hold the switch control signal so that the communication control module need not be triggered continuously, a level driving module for converting the switch control signal into a level signal necessary for driving the switch module, and a switch module for turning on or off signals according to the control signal;
a rectifying and processing module for rectifying and filtering an electric signal output from the piezoelectric vibrator in the charging mode; and
a charging control module for selecting a charging manner, selecting an ON or OFF status of a pathway and adjusting a voltage generated by the piezoelectric vibrator.
2. The piezoelectric charging system of claim 1 , wherein the driving module comprises a boosting module, an amplification factor control module and an amplification driving module, the boosting module is adapted for boosting a power supply voltage to a voltage necessary for enabling the piezoelectric vibrator to vibrate, the amplification factor control module is adapted for adjusting an amplitude of an input signal that is input into the piezoelectric vibrator, and the amplification driving module is adapted for amplifying the input signal of which the amplitude has been controlled so that the voltage and power required for driving the piezoelectric vibrator to vibrate can be achieved.
3. The piezoelectric charging system of claim 2 , wherein the input signal is of an analog signal or a digital signal.
4. The piezoelectric charging system of claim 1 , wherein the rectifying and processing module comprises a rectifier bridge for converting an alternating current (AC) signal generated by the piezoelectric vibrator into a direct current (DC) signal, and a capacitor for filtering and for temporary storage of energy.
5. The piezoelectric charging system of claim 1 , wherein the charging control module comprises a pathway selecting module for selecting an ON or OFF status of the pathway, a control module for controlling the charging manner, and a level adjusting module for adjusting a voltage generated by the piezoelectric vibrator so that the charging voltage is kept within a certain range.
6. An electronic terminal device, comprising the piezoelectric charging system in claim 1 .
7. An electronic device, comprising:
a battery;
a piezoelectric charging system configured for being capable of charging the battery, the piezoelectric charging system comprising:
a piezoelectric vibrator including a piezoelectric sheet for sensing the vibration of the electronic device and converting the vibration into electric energy by virtue of the deformation of the piezoelectric sheet;
a driving module for driving the piezoelectric vibrator to vibrate in the vibration mode, a switch selecting module for controlling the piezoelectric charging system to select whether the vibration mode or the charging mode is used, a rectifying and processing module for rectifying and filtering an electric signal output from the piezoelectric vibrator in the charging mode, and a charging control module for selecting a charging manner, selecting an ON or OFF status of a pathway and adjusting a voltage generated by the piezoelectric vibrator.