Abstract: Provided are a cam turntable (2), a sun-tracking device equipped with the cam turntable (2) and a control method for the device. The sun-tracking device comprises a support mechanism for mounting a photovoltaic assembly (1), and an azimuth driving device, which is a cam turntable (2), fixed on the support mechanism for adjusting the azimuth thereof. The sun-tracking device adjusts the azimuth of the support mechanism for mounting the photovoltaic assembly (1) by utilizing the cam turntable (2) as the azimuth driving device, so that harmful incoming impact loads on the sun-tracking device as a whole are transferred into friction forces which are then transferred and alleviated, therefore it is advantageous in avoiding damages to subsequent driving devices due to the excessively large impact loads, especially in protecting the precision of a control worm gear (2-12) from being affected, which in turn extends the service life of the sun-tracking device as a whole.

Abstract: A condensing lens, compound-eye lens condenser, and compound-eye concentrating-type solar cell assembly. The condensing lens is a convex lens that can reflect mutually parallel incident lights (3) onto a receiving surface (4) on the outer side of the lens and thus form spots. If the vertical distance from the contact point of any incident lights (3) contacting the lens to a light axis (103) of the lens is x, the vertical distance between a projection point formed from the incident light (3) reflecting onto the receiving surface (4) and the center of the spot is m, the radius of the lens is a, and the radius of the spot is b, then the lens meets the following condition: x/m=a/b. The condensing lens has a high transmission rate, and the energy distribution of the spots is more even after condensing, the transmission rate is 90% to 93%, and the energy distribution curve of the spots transmitted through the condensing lens is similar to saddle-shaped.

Abstract: A condensing lens, compound-eye lens condenser, and compound-eye concentrating-type solar cell assembly. The condensing lens is a convex lens that can reflect mutually parallel incident lights (3) onto a receiving surface (4) on the outer side of the lens and thus form spots. If the vertical distance from the contact point of any incident lights (3) contacting the lens to a light axis (103) of the lens is x, the vertical distance between a projection point formed from the incident light (3) reflecting onto the receiving surface (4) and the center of the spot is m, the radius of the lens is a, and the radius of the spot is b, then the lens meets the following condition: x/m=a/b. The condensing lens has a high transmission rate, and the energy distribution of the spots is more even after condensing, the transmission rate is 90% to 93%, and the energy distribution curve of the spots transmitted through the condensing lens is similar to saddle-shaped.

Abstract: Provided are a cam turntable (2), a sun-tracking device equipped with the cam turntable (2) and a control method for the device. The sun-tracking device comprises a support mechanism for mounting a photovoltaic assembly (1), and an azimuth driving device, which is a cam turntable (2), fixed on the support mechanism for adjusting the azimuth thereof. The sun-tracking device adjusts the azimuth of the support mechanism for mounting the photovoltaic assembly (1) by utilizing the cam turntable (2) as the azimuth driving device, so that harmful incoming impact loads on the sun-tracking device as a whole are transferred into friction forces which are then transferred and alleviated, therefore it is advantageous in avoiding damages to subsequent driving devices due to the excessively large impact loads, especially in protecting the precision of a control worm gear (2-12) from being affected, which in turn extends the service life of the sun-tracking device as a whole.