4 results about "Port expander" patented technology

The present invention discloses a pan-tilt control device and method for matching the rotation speed and torque of a pan-tilt. The device includes a micro-control unit electrically connected to a pan-tilt controller, and is provided with a port expander for outputting pulse signals with different duty cycles at the port expander according to the motion trend of the pan-tilt; a filtering circuit electrically connected to the micro-control unit through the port expander for filtering the pulse signals to form different reference levels; a digital-to-analog converter electrically connected to the filtering circuit for converting the reference levels into digital level signals; a driving circuit electrically connected to a power supply and a driving motor for controlling the current of the driving motor; a pulse modulation circuit electrically connected to the digital-to-analog converter and the driving circuit for adjusting the current of the driving motor according to a target peak current; and a pan-tilt driving motor electrically connected to the driving circuit and the pulse modulation circuit for driving the pan-tilt. The present invention can avoid excessive power consumption when the pan-tilt is locked, and motor out-of-step caused by insufficient torque when the rotation speed is increased, etc.

A network device of a motor vehicle network structure is described, comprising an Ethernet switch and a defined total number of network devices to be connected via the Ethernet switch, wherein a port expander is connected to the Ethernet switch, the port expander having a number of device ports corresponding to the difference between the total number and the number of device ports provided for network devices on the Ethernet switch.