Fig. 1. Block diagram of DMPPT system

Fig. 2. Structure of tandem PV array

Fig. 3. PV cell output characteristics. (a) I-V curve; (b) P-V curve

Fig. 4. Schematic diagram of PT-Boost circuit

Fig. 5. Equivalent circuit diagrams of PT-Boost for six operating states. (a) S1; (b) S2; (c) S3; (d) S4; (e) S5; (f) S6

Fig. 6. Current ripple at MPP

Fig. 7. (a), (b) and (c) P-V characteristic curves and maximum power of each GaAs cell for 0%, 25%, and 50% shade conditions; (d), (e) and (f) DMPPT system output power under 0%, 25%, and 50% shading condition

Fig. 8. Test system for DMPPT. (a) LWPT system receiver and transmitter; (b) DMPPT system test experiment device

Fig. 9. (a) I-V and P-V output curve of GaAs cell; (b), (c) The operating voltage and current of the conventional Boost and PT- Boost circuits at the MPP are respectively

Fig. 10. (a), (b) and (c) P-V characteristic curves and maximum power point power of each GaAs cell for 0%, 25%, and 50% shade conditions; (d), (e) and (f) DMPPT system output power under 0%, 25%, and 50% shade conditions