Abstract: Disclosed are a method and a device for identifying full-section excavation parameters of large-section tunnel with broken surrounding rock, which is capable of solving the problem of inaccurate arrangement of blasting hole points in tunnel excavation engineering, including following steps: establishing a three-dimensional finite element model based on a blasting section design of a tunnel; performing a simulation with the three-dimensional finite element model based on blasting design parameters to obtain blasting quality parameters; selecting a group closest to a preset quality parameter from multiple groups of the blasting design parameters as target blasting design parameters, wherein the preset quality parameter is an acceptance grade standard of the tunnel; obtaining first thermal imaging information of a first hot spot of a surface to be blasted; calibrating actual hole spacing parameters based on the first thermal imaging information and the target blasting design parameters.

Abstract: The present application provides an optical information collector and a method thereof. The optical information collector includes an image sensor, configured to collect image data of optical information; a decoding unit, configured to decode the image data based on a preset decoding algorithm; a central processor, configured to control the image sensor to collect the image data and control the decoding unit to decode the image data upon triggering. Once triggered, the central processor issues an instruction to discard N frames of image data in a specific frame number, where the N frames of image data in a specific frame number is image data that was previously collected and remaining in the optical information collector upon triggering, which can prevent residual image data from being decoded and outputted, causing a decoding error, thereby improving a decoding efficiency.

Abstract: A rotor structure for reducing a working temperature in a shaft is disclosed. The rotor structure comprises a hollow shaft body and an inner shaft sleeve, the inner shaft sleeve is assembled in the hollow shaft body, and a first thermal insulating cavity is formed between the inner shaft sleeve and the hollow shaft body. The rotor structure according to the present disclosure can be applied to the motor, and can effectively reduce the working temperature of the inner surface of the hollow shaft of the motor and ensure the reliable operation of the motor.

Abstract: Methods and systems for improved dimming of LED based illumination devices are described herein. An AC input voltage provided to an LED driver is rectified and the rectified signal is monitored by a Rectified Voltage Monitor (RVM) circuit. The RVM circuit generates a low voltage monitor signal indicative of the shape and peak voltage of the rectified signal. The monitor signal and the rectified signal are communicated to a power converter of the LED driver. The controller of the power converter employs the monitor signal to maintain efficiency and stability of the LED driver over an extended range of AC input voltage. The instantaneous voltage of the rectified signal is divided-down, and the peak value of the divided-down rectified signal is captured and stored on one or more capacitive elements. In another aspect, the peak voltage stored on one or more capacitive elements is less than 100 Volts.

Abstract: Methods and systems for improved dimming of LED based illumination devices are described herein. An AC input voltage provided to an LED driver is rectified and the rectified signal is divided down by a voltage divider circuit to supply electrical power to a dimming interface circuit. The fraction by which the voltage divider circuit divides down the rectified signal is controlled by a Dynamic Input Voltage Compensator (DIVC) based on the peak value of the rectified signal. In this manner, the DIVC increases the range of AC input voltage to the LED driver while maintaining efficiency and stability of the LED based illumination system by reducing the variation of the voltage supplied to the dimming interface circuit over a larger range of AC input voltage.

Abstract: A control gas ball valve for high pressure gas cooking appliances provides a linear surface slot along its rotation direction. When turned by a control knob and enters a gas inlet, the said surface slot is able to channel gas input to a hole that connects said surface slot to the center of the valve ball. The gas in the center of the valve ball is directed away to a burner for cooking purposes. The said linear surface slot is able to provide constant flowrate slope for continuously variable power adjustment and a maximum power plateau. These are the most desirable features in residential cooking.

Abstract: Methods and systems for controlling current provided to one or more LEDs for a period of time after power supplied to the LED driver is shut down are described herein. By controlling current through the one or more LEDs after shutdown, the light emitted from the one or more LEDs transitions to zero at a predictable rate with a predictable lag time. An LED based illumination system includes an energy storage element and a controlled luminous drawdown module electrically coupled between one or more LEDs and an electrical power converter employed to control current provided to the one or more LEDs during normal operation. The controlled luminous drawdown module senses a reduction in voltage at the output of the electrical power converter and operates to control current flow through one or more LEDs of the LED string until electrical energy stored in the electrical storage element is depleted.

Abstract: A control gas ball valve for high pressure gas cooking appliances provides a linear surface slot along its rotation direction. When turned by a control knob and enters a gas inlet, the said surface slot is able to channel gas input to a hole that connects said surface slot to the center of the valve ball. The gas in the center of the valve ball is directed away to a burner for cooking purposes. The said linear surface slot is able to provide constant flowrate slope for continuously variable power adjustment and a maximum power plateau. These are the most desirable features in residential cooking.

Abstract: Methods and systems for improved control of dimmable, white color tunable, multiple channel LED based illumination systems are described herein. The methods and systems described herein improve the utilization of LEDs comprising a multiple channel white light LED based illumination system, along with improved control of brightness and color of emitted light. In one aspect, a multiple channel electrical power driver includes an independent current controlled Direct Current/Direct Current (DC/DC) electrical power converter electrically coupled to each LED string having a different color output. The use of independent DC/DC power converters enables current to be supplied to each LED channel simultaneously up to the rated maximum continuous operating current level in each channel. Thus, the sum of the current provided to each LED channel exceeds the rated maximum continuous operating current of each of the LED channels.

Abstract: An apparatus, method and system are disclosed for providing AC line power to lighting devices such as light emitting diodes (“LEDs”). A representative apparatus comprises: a plurality of LEDs coupled in series to form a plurality of segments of LEDs; first and second current regulators; a current sensor; and a controller to monitor a current level through a series LED current path, and to provide for first or second segments of LEDs to be in or out of the series LED current path at different current levels. A voltage regulator is also utilized to provide a voltage during a zero-crossing interval of the AC voltage. In a representative embodiment, first and second segments of LEDs are both in the series LED current path regulated at a lower current level compared to when only the first segment of LEDs is in the series LED current path.

Abstract: An apparatus, method and system are disclosed for providing AC line power to lighting devices such as light emitting diodes (“LEDs”). A representative apparatus comprises: a plurality of LEDs coupled in series to form a plurality of segments of LEDs; first and second current regulators; a current sensor; and a controller to monitor a current level through a series LED current path, and to provide for first or second segments of LEDs to be in or out of the series LED current path at different current levels. A voltage regulator is also utilized to provide a voltage during a zero-crossing interval of the AC voltage. In a representative embodiment, first and second segments of LEDs are both in the series LED current path regulated at a lower current level compared to when only the first segment of LEDs is in the series LED current path.

Abstract: An apparatus, method and system are disclosed for providing AC line power to lighting devices such as light emitting diodes (“LEDs”). A representative apparatus comprises: a plurality of LEDs coupled in series to form a plurality of segments of LEDs; first and second current regulators; a current sensor; and a controller to monitor a current level through a series LED current path, and to provide for first or second segments of LEDs to be in or out of the series LED current path at different current levels. A voltage regulator is also utilized to provide a voltage during a zero-crossing interval of the AC voltage. In a representative embodiment, first and second segments of LEDs are both in the series LED current path regulated at a lower current level compared to when only the first segment of LEDs is in the series LED current path.