Abstract: A tunnel automatic monitoring and measuring equipment and method based on fixed-point tour measurement are provided. The equipment includes a monitoring trolley that can move freely in the longitudinal direction of the tunnel, multiple automatic tracking and identification devices are set on the monitoring trolley, the automatic tracking and identification device is connected to the background processing system telecommunication; a monitoring points with reflective markings are arranged on the surface of the tunnel support structure, under the cooperation of the monitoring trolley and the automatic tracking and identification device, the reflective markings set on the tunnel support structure can be automatically measured at the fixed point to obtain the coordinate information of the relevant monitoring points; then, the deformation data of the support structure required in the construction process are extracted by coordinate information calculation.

Abstract: An energy-saving control method includes obtaining a demand instruction configured to indicate an energy-saving operation and a performing time slot of the energy-saving operation. The energy-saving operation is determined based on load data of a power grid and is configured to reduce a load of the power grid. The method further includes transmitting a first control message configured to control an authorized device to perform the energy-saving operation in response to detecting that time reaches the performing time slot, and transmitting a second control message configured to control the authorized device to stop performing the energy-saving operation in response to detecting that time is outside the performing time slot.

Abstract: A start-up routine for a Switched-Mode Power Supply (SMPS) gradually increases the duty cycle while reducing an initial dead time to a final optimal dead time for normal operation. Reliability is improved by the larger initial dead time that reduces ringing in switching transistors during low-voltage conditions early in the start-up sequence. Efficiency is improved by reducing the optimal dead time as voltages approach operating levels. The initial dead time is pre-calculated as a function of the input voltage and initial duty cycle. Optimal dead times are pre-calculated as a function of output voltage and output current. The optimal dead time is adjusted for each iteration of a second loop that also increases duty cycle until the target operating output voltage is reached. Pre-calculated dead times are based on the time required to fully charge and discharge parasitic drain-to-source capacitances in the switching transistors in the SMPS circuit.

Abstract: The invention discloses a binocular robot for bridge underwater detection based on 5G communication. The robot includes a body, a base, a power arm, a video collection component, a communication component and a power component. The underwater part of the bridge may be collected in the form of a video by the configured video collection component, and the robot may be driven by the power component to move underwater. Driven by a first motor, a binocular camera may rotate to observe various orientations underwater, and meanwhile may drive a cleaning component coordinated with an electric top block to wipe the lens of the binocular camera, so that the video information may be collected clearly underwater. Finally, the video information may be transmitted to a worker on the water through the communication component to achieve the effect of remote detection, which saves the underwater detection cost and improves detection efficiency.

Abstract: An assembly for power converting includes a circuit board, a power switching circuit mounted on the circuit board, an inductor coil that includes a winding and two ends, a magnetic core that is surrounded by the winding of the inductor coil, and a magnetic mixture that encapsulates the circuit board, the power switching circuit, the inductor coil and the magnetic core. The winding of the inductor coil is stacked above the power switching circuit and is sufficiently large to fill up a size of the assembly.

Abstract: An assembly for power converting includes a circuit board, a power switching circuit mounted on the circuit board, an inductor coil that includes a winding and two ends, a magnetic core that is surrounded by the winding of the inductor coil, and a magnetic mixture that encapsulates the circuit board, the power switching circuit, the inductor coil and the magnetic core. The winding of the inductor coil is stacked above the power switching circuit and is sufficiently large to fill up a size of the assembly.

Abstract: Two or more power converters are connected in parallel to supply power current to a joining node through connecting resistors. An output voltage before the connecting resistor in each power converter is sampled and divided by a sampling ratio to generate sampled voltages for each power converter. A current sharing circuit for each power converter receives the local sampled voltage and another sampled voltage from another power converter. The current sharing circuit generates an adjustment voltage that is injected into a feedback loop. The adjustment voltage modifies the output voltage of the power converter, adjusting and balancing the power current delivered by that power converter. Power currents from several power converters are reduced and balanced when the same sampling ratio is used for all power converters. Current hogging by one power converter is prevented.

Abstract: Two or more power converters are connected in parallel to supply power current to a joining node through connecting resistors. An output voltage before the connecting resistor in each power converter is sampled and divided by a sampling ratio to generate sampled voltages for each power converter. A current sharing circuit for each power converter receives the local sampled voltage and another sampled voltage from another power converter. The current sharing circuit generates an adjustment voltage that is injected into a feedback loop. The adjustment voltage modifies the output voltage of the power converter, adjusting and balancing the power current delivered by that power converter. Power currents from several power converters are reduced and balanced when the same sampling ratio is used for all power converters. Current hogging by one power converter is prevented.