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A system scheme of the stand-alone photovoltaic inverter based on parallel charge topology for the purpose of improving the energy conversion efficiency and optimizing the battery management was introduced. A novel circuit topology of the DC-AC inverter with the soft switching property using IGBTs and MOSFETs was presented. A modified P&O algorithm for better tracking performance with adaptive step length adjustment was proposed. And a comprehensive strategy for maximum power point tracking (MPPT) with the Constant Voltage Tracking (CVT) algorithm and the modified adaptive Perturbation and Observation (P&O) algorithm was developed.A prototype was implemented to very the feasibility of the proposed scheme.

The electronic water pump will be used more and more widely in the new energy vehicles and other special vehicles. A sensorless electronic water pump for automobile is designed and implemented with the brushless direct current motor (BLDCM) as the driving motor. A sensorless magnetic field oriented control (FOC) scheme using sliding mode observer (SMO) is applied for the motor control. A novel SMO and the phase-locked loop (PLL) for reducing the chattering phenomenon are used to estimate rotor velocity/position from the back electromotive force (EMF), in which a continuous saturation function is applied instead of the sign function. A robust If startup strategy is introduced. The hardware circuit design and software algorithm design are presented. The experimental system is set up and some experimental results are demonstrated. The effectiveness and correctness of the proposed hardware design and the software scheme are validated. Experimental results show that the developed electronic water pump is reasonable and feasible with a high cost performance.

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