Abstract: A voltage feed-forward circuit, a multiplier using the voltage feed-forward circuit, and a power factor correction circuit using the multiplier. The voltage feed-forward circuit is used to maintain and output a peak voltage (Vff) of an input voltage (Vin), and includes first switch element (S1), a logic control unit (U1), a second switch element (S2), a first capacitor (C1), a third switch element (S3) and a second capacitor (C2). The first control signal (?1) and the second control signal (?2) begin to be provided at the same time, and the first control signal (?1) stops being provided when a voltage of the second end of the first capacitor (C1) is greater than the peak voltage (Vff) of the input voltage (Vin).

Abstract: The present invention disclosure provides a multiplier and a power factor correction circuit which the multiplier is applied. The multiplier comprises a Gilbert multiplier circuit comprising a first differential input stage, a second differential input stage and an output stage; a first differential voltage conversion circuit; a second differential voltage conversion circuit; and a bias current generating circuit; Wherein said output stage comprises: a current mirror unit comprising two current input terminals and a current output terminal; and a feedback control unit configured to ensure that the current output terminal does not output current when the voltage difference received by the multiplier is zero. The present invention is advantageous in improving the linearity of the multiplier and the accuracy of the output current of the multiplier output current.

Abstract: A voltage feed-forward circuit, a multiplier using the voltage feed-forward circuit, and a power factor correction circuit using the multiplier. The voltage feed-forward circuit is used to maintain and output a peak voltage (Vff) of an input voltage (Vin), and includes first switch element (S1), a logic control unit (U1), a second switch element (S2), a first capacitor (C1), a third switch element (S3) and a second capacitor (C2). The first control signal (?1) and the second control signal (?2) begin to be provided at the same time, and the first control signal (?1) stops being provided when a voltage of the second end of the first capacitor (C1) is greater than the peak voltage (Vff) of the input voltage (Vin).

Abstract: The present invention disclosure provides a multiplier and a power factor correction circuit which the multiplier is applied. The multiplier comprises a Gilbert multiplier circuit comprising a first differential input stage, a second differential input stage and an output stage; a first differential voltage conversion circuit; a second differential voltage conversion circuit; and a bias current generating circuit; Wherein said output stage comprises: a current mirror unit comprising two current input terminals and a current output terminal; and a feedback control unit configured to ensure that the current output terminal does not output current when the voltage difference received by the multiplier is zero. The present invention is advantageous in improving the linearity of the multiplier and the accuracy of the output current of the multiplier output current.

Abstract: A hyperspectral imaging light source system includes a light box (1). The light box (1) is a sealed cuboid. In the chamber of the box body a line-scanning camera (2), a beam splitting system (3), an electric control translation platform carrier (5) and the object to be detected (4) on the electric control translation platform carrier, an electric control translation platform screw (6), a linear light source box (7) and a photosensitive diode (8) are respectively provided. A linear light source controller (9), a step motor (10) and a computer (11) are provided outside the box body. The photosensitive diode (8) senses linear light source intensity variation and inputs a feedback signal to the linear light source controller (9). A halogen lamp (13) is installed in the linear light source box (7), and is connected with the linear light source controller (9).

Abstract: A hyperspectral imaging light source system includes a light box (1). The light box (1) is a sealed cuboid. In the chamber of the box body a line-scanning camera (2), a beam splitting system (3), an electric control translation platform carrier (5) and the object to be detected (4) on the electric control translation platform carrier, an electric control translation platform screw (6), a linear light source box (7) and a photosensitive diode (8) are respectively provided. A linear light source controller (9), a step motor (10) and a computer (11) are provided outside the box body. The photosensitive diode (8) senses linear light source intensity variation and inputs a feedback signal to the linear light source controller (9). A halogen lamp (13) is installed in the linear light source box (7), and is connected with the linear light source controller (9).