4results about How to "Precise modulation" patented technology

The invention discloses a device and a method for adjusting PLL (Phase Locked Loop) loop bandwidth based on VCO (Voltage Controlled Oscillator) working voltage. The device comprises a phase frequency detector, a digital filter, a digital oscillator and a frequency divider, the phase frequency detector is used for comparing the input signal with the output signal to obtain an error signal; the digital filter is used for processing the error signal; the digital filter comprises a proportional path; the digital oscillator is used for generating an output signal based on the processed error signal; the digital oscillator comprises a switch variable capacitor array; the switch variable capacitor array is used for adjusting the working voltage of the digital oscillator based on the error signal; the proportion path is directly connected with the phase frequency detector and the switch variable capacitor array; the frequency divider is used for carrying out frequency division on the output signal and feeding back the output signal to the phase frequency detector; by modifying the gain coefficient of the proportional path in the phase-locked loop, the adjustment of the loop bandwidth is realized, and the adjustment flexibility is improved.

The present application relates to the field of optics, in particular to a broadband achromatic superlens with a large field of view. The superlens is composed of a cylindrical base embedded with a non-equal-height circular hole array and a nano-pillar array with a multi-ring structure. The non-equal-height circular hole array serves as the light entrance surface, and the nano-pillar array serves as the light exit surface. The circular hole array on the base has different depths and radii, and the nano-pillar array unit structure layer is composed of multiple ring bands, each ring band corresponding to a wavelength to achieve broadband achromatism. The nano-pillars arranged in the unit structure layer have various structures, such as cylindrical, annular, cross-shaped, etc. Different nano-pillar structures are used from the center to the outside, thereby reducing the mutual interference between adjacent ring bands. The materials of the unit structure layer and the base are transparent or low-absorption materials, and appropriate materials are selected according to different wavelength ranges. The superlens proposed in the present application can focus light beams of any wavelength range under a large field of view and a large spectral bandwidth.

Embodiments of the application provide a motor voltage vector modulation method and device, electronic equipment and storage medium, and relate to the technical field of electrical control. The phase voltage amplitude and the direct-axis voltage reference value of the motor voltage vector are obtained, and the maximum quadrature-axis voltage square value is calculated according to the phase voltage amplitude and the direct-axis voltage reference value. The current following variable of the maximum quadrature-axis voltage is obtained, and the square value of the current following variable is calculated. The square value of the current following variable is compared with the maximum quadrature-axis voltage square value to obtain a first comparison result. The current following variable is adjusted according to the first comparison result to obtain a modified following variable. The modified following variable is compared with the quadrature-axis voltage reference value to obtain a second comparison result. The quadrature-axis voltage reference value is adjusted according to the second comparison result. According to the embodiments of the application, the SVPWM voltage vector can be directly limited in the inscribed circle modulation region by simple condition judgment and change of the following variable, and the operation is simple, the modulation is accurate, and the algorithm execution period is short.

According to the novel composite optical structure and the peep-proof display device, the structure modulates light, refracts small-angle incident light and absorbs large-angle incident light, and therefore the divergence angle of the light is restrained. The novel composite optical structure is composed of a light control layer, a spacing layer and a light beam distribution layer. Wherein the light control layer is tightly attached to the spacing layer. The light control layer is composed of a lens array layer and is used for modulating light rays reaching the light control layer through the spacing layer and the light beam distribution layer and refracting small-angle light rays to achieve light emission. The spacing layer is located between the light control layer and the light beam distribution layer. The light beam distribution layer is composed of a light-transmitting array area and a non-light-transmitting array area and has the function of light beam distribution and absorption, the light beam distribution layer and the spacing layer act together to distribute small-angle light to the lens units right opposite to the light-transmitting area, and large-angle light is absorbed.