4results about How to "Eliminate time lag" patented technology

This invention relates to a frequency identification circuit for motor driver control, belonging to the field of motor drive control technology. The frequency identification circuit compares frequency signals with corresponding duty cycles of 1% and 99% using two comparators. The first comparator circuit amplifies the output signal of the frequency identification module and inputs it to the non-inverting terminal of the comparator. The second comparator circuit directly inputs the output signal of the frequency identification module to the inverting terminal of the comparator. When the duty cycle is less than 1% or greater than 99%, the corresponding comparator outputs a low level. The signal processing circuit uses the unidirectional conductivity of a diode to perform an OR operation on the two comparison signals. If either signal goes low, the driver enable terminal is pulled low, triggering a protection mode. This invention enables rapid identification and protection against PWM signal anomalies, effectively improving the reliability of protection for motor drivers and electric servos.

The application provides an active vibration isolation system based on a phase conjugate elastic beam, which comprises a foundation base plate, a vibration isolation platform and four vibration isolation units arranged in a rectangular symmetry. Each vibration isolation unit comprises a lower connecting seat, a quasi-zero stiffness mechanism, a phase conjugate elastic beam assembly, an upper connecting seat, a piezoelectric-elastic fluid composite actuator and an analog controller. The quasi-zero stiffness mechanism adopts an air spring to provide positive stiffness and a permanent magnet and an electromagnet to provide real-time adjustable negative stiffness in an opposite pole state. The elastic beam is in a cosine curve shape, two ends of the elastic beam are connected with floating seats through flexible hinges, and strain gauges are pasted at symmetrical positions to realize time-lag-free speed prediction. In the piezoelectric-elastic fluid composite actuator, working liquid is continuously through, and high and low frequency control forces are naturally separated through fluid dynamics. The application keeps the phase flat in the full frequency band of 0.1Hz to 100Hz and can realize hybrid control without time lag.

The invention discloses a snapshot type automatic optical microscopic defect detection system and a detection method. The resolution ratio and accuracy of fine defect identification are improved through the microscopic imaging module, the high-speed coding spatial light modulation module is introduced to carry out spatial modulation on a light field carrying defect information, and a camera module can obtain a compressed measurement image through one-time exposure in cooperation with relative movement of a to-be-detected product and the microscopic imaging module. And a high-resolution defect image is recovered through a calculation reconstruction algorithm, the limitation of the frame rate of the camera is broken through, the mechanical scanning delay is eliminated, and high-speed snapshot type detection is realized. The method is particularly suitable for rapid and nondestructive online detection of defects such as internal bubbles and surface cracks of workpieces such as glass and silicon wafers on an industrial production line.

The invention relates to the technical field of meteorological ecological observation, biological safety detection, environment monitoring and the like, and discloses a biological aerosol automatic identification system and method based on ultraviolet fluorescence imaging, and the system comprises an environment control module, an aerosol sampling module, an adhesive tape transmission module, an ultraviolet microscopic imaging module and a control and data processing module. The environment control module is used for constructing a constant-temperature closed optical darkroom; the aerosol sampling module captures biological particles in the air on the surface of a carrier adhesive tape by utilizing an acceleration nozzle and an inertial impact principle; the adhesive tape transmission module realizes automatic transfer of a sample from a sampling position to a detection position through stepping control; the ultraviolet microscopic imaging module adopts a coaxial incident light path structure and is matched with a dichroic spectroscope and an optical filter to separate exciting light and fluorescence signals. According to the invention, full-process automatic in-situ monitoring of the biological aerosol is realized, the problem of background interference is effectively solved, and the real-time performance of detection and the recognition accuracy are improved.