53results about How to "Improve dynamic accuracy" patented technology

Animated image vision tests take advantage of the ability of our eyes to detect both distance and motion. Moving images, such as rotating segmented circles, let the eyes detect motion as to the size, distance, and rotation direction of that moving image. That motion detection is much more precise than the interpretation of multiple static letters or static images. Using rotating images for vision testing rather than static images creates an acuity test more accurate than current tests, a test that is faster to use, and a test that doesn't require the ability to read.

The invention discloses a coaxial macro-micro composite linear motion platform device and an accuracy compensation method of the coaxial macro-micro composite linear motion platform device. The coaxial macro-micro composite linear motion platform device comprises a macro motion device, a micro motion device, a control device and a location detection device, wherein the macro motion device is composed of a servo driver, a straight line drive module, a straight line guide rail, a base and a macro moving working platform. The micro motion device is composed of a piezoelectric ceramic driver or a voice coil motor and a flexible hinge amplifying mechanism. The flexible hinge amplifying mechanism is composed of a flexible hinge, a micro motion working platform and a frame. The piezoelectric ceramic driver or the voice coil motor drives the flexible hinge amplifying mechanism to drive the micro motion working platform to generate displacement. The location detection device detects displacement information of a macro-micro motion working platform in real time and sends the displacement information to the control device. The control device drives the micro motion working platform to compensate motion of the macro motion device in real time according to detection information of a macro-micro motion displacement sensor, and thus high static accuracy and high dynamic accuracy of the coaxial macro-micro composite linear motion platform device are achieved.

A battery charge and discharge device comprises a battery charge and discharge assembly and a full digital controller, which is characterized in that the battery charge and discharge assembly is composed of an AC-DC voltage PWM controllable rectifier part, a DC link filter part and an AC-DC bidirectional chopper part which are in cascade connection; the AC-DC voltage PWM controllable rectifier part is formed by the cascade connection of an AC inlet inductance and a full control rectifier bridge, wherein the AC inlet inductance is formed by the cascade connection of a transformer output leakage inductance and an AC inductance, and the bridge arm of the full control rectifier bridge is formed by the cascade connection of power switching elements; the DC link filter part is formed by the parallel connection of a DC capacitance and a high frequency absorption capacitance; the AC-DC bidirectional chopper part is formed by the series connection of power switching elements and a DC output inductance. The battery charge and discharge device has the advantages that power factor approaches 1 when the battery is being charged, input current harmonics content is low, output voltage range is wide, output current precision is high and the like, and the battery charge and discharge device realizes safe machine halt in case of power failure at the same time.