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In this paper, the test platform of PV inverter MPPT efficiency is researched. The test method of PV inverter MPPT efficiency is analyzed according to evaluation index of PV inverter MPPT efficiency. Based on the MPPT efficiency test method, The PV array simulation should output P-V curve of PV array in different irradiance and different type of PV module. A 500kW PV inverter MPPT efficiency is tested...
In this paper, the method of irradiance on horizon change to irradiance on PV array is analyzed. The two PV systems which in same latitude but different irradiance resource and irradiance ingredients are simulated in order to got the optimal tilt of PV array. the tilt of PV array should chosen from 0° to local latitude. In direct irradiance abundant region, the tilt should be increased. In diffuse...
This paper proposes a single-stage Flyback PFC Converter with new primary side control scheme for Triac compatible LED drivers. The proposed control scheme can achieve high power factor and efficiency by eliminating the conventional dummy load required for Triac dimmer. Also, almost linear dimming can be achieved by the phase angle feed forward and primary side constant power control. No secondary...
This paper proposes a family of simple, precise and lossless current balancing methods based on charge balancing for multi-output LED strings application. A capacitor is in series with the transformer secondary side to block the output DC voltage difference, and the output current balancing can be achieved by capacitor charge balancing. Compared to the conventional active current sharing technique...
The multistring LED in parallel is a popular structure in backlight and lighting applications. The current balancing for each string is required to achieve uniform luminance and reliable operation. This paper proposes a simple and precise lossless passive current balancing circuit for multiple LED strings application. With a dc block capacitor in series with the transformer secondary side and the...
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