In order to overcome the difficulty of power supply of electrical valve in the deserts and other circumstances, a novel method of power supply with photovoltaic cell is proposed in this paper, and constructs the controlling circuit of digital software phase-locked loop (DSPLL) using digital signal process (DSP), which is driven by pulse width modulation (PWM) controlled by DC motor. Finally, the experimental shows that this method is capable of meeting the requirement for the equipment of power supply, The proposed stand-alone photovoltaic renewable energy supply scheme is suitable foe low cost resort electricity applications in rang of (100 watts to 800watts), mostly foe water pumping, water heating and so on.
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