Abstract: A lifting device for building a steel structure hoistway and a method for building a steel structure hoistway. The lifting device includes a lifting mechanism and a crane mechanism. The lifting mechanism includes a bottom platform, a middle platform and a top platform. The crane mechanism is arranged on the top platform of the lifting mechanism, and includes a base and a crane on the base. The base is arranged on the top platform and is rotatable relative to the top platform along a vertical axis, and the hanger frame of the crane is movable between a vertical orientation and an inclined orientation. The lifting mechanism is configured to ascend and descend in the constructed steel structure hoistway, and the crane mechanism is configured to lift building materials, such as steel beams, steel columns, etc., for use in building the steel structure hoistway to their designed installation locations.

Abstract: An apparatus for wireless power reception includes a receiver coil and a rectifier having a first input and a second input, the first input coupled to a first terminal of a receiver coil, the second input coupled to a second terminal of the receiver coil through a resonant capacitor. The apparatus further includes a first capacitor and a first switch network connected in series between the first input and ground and a second capacitor and a second switch network connected in series between the second input and ground, each of the first switch network and the second switch network including at least a plurality of field-effect transistors (FETs) connected in parallel, wherein the first switch network and the second switch network configured to adjust an impedance coupled to the receiver coil, the impedance associated with an Amplitude Shift Keying (ASK) modulation used by the apparatus.

Abstract: A multi-timescale voltage regulation method based on source-grid-load-storage multi -terminal collaboration of a power distribution network is disclosed, which comprises: establishing, based on a Petri network, a multi-mode switching control model based on voltage security event trigger to realize effective control of a global voltage; establishing multi-objective optimization taking into account a source-storage-load regulation cost and a network transmission loss to realize collaborative and dynamic control of controllable resources of a source terminal, a load terminal and a storage terminal in each operating mode; and establishing a source-storage-load multi-terminal collaboration-based distributed voltage control model based on voltage security event trigger over a short timescale by taking into account the problems of voltage magnitude being out of limit and voltage leap, and solving online an optimal control sequence of the source terminal, the load terminal and the storage terminal in a receding horiz

Abstract: Disclosed are an emergency control method and system based on source-load-storage regulation and cutback. According to the method, output power of power generating sources is regulated according to a power regulating quantity and a frequency regulation requirement, an output power compensation and output frequency of each power generating source are maintained within permissible ranges, so that a balance between power supply and demand of a power distribution network is maintained; and standby energy-storage power stations are used to make up a power gap, and an external power supply system is used to assist in making up a power deficiency, so that large load disturbance can be handled make up the power gap.

Abstract: An electrochromic device with side-by-side structure including a common electrode unit, at least one color-changing unit and an electrolyte layer is provided. The common electrode unit includes an electrode layer and an electrode protection layer disposed on the electrode layer. The color-changing unit includes a transparent conductive layer and a color-changing layer disposed on the transparent conductive layer. The common electrode unit and each color-changing unit are arranged on the same plane with an insulating region between two adjacent units. The electrolyte layer covers and connects the electrode protection layer of the common electrode unit and the color-changing layer of each color-changing unit.

Abstract: Provided is a display backplate including an array substrate and a plurality of pairs of connection structures on the array substrate, wherein the array substrate includes a plurality of thin-film transistors and a common electrode signal line, wherein at least one of the plurality of thin-film transistors is connected to one of a pair of connection structures and the common electrode signal line is connected to the other of the pair of connection structures; and an area of a first section of the connection structure is negatively correlated with a distance between the first section and a surface of the array substrate, and the first section is parallel to the surface of the array substrate.

Abstract: A lifting device for building a steel structure hoistway and a method for building a steel structure hoistway. The lifting device includes a lifting mechanism and a crane mechanism. The lifting mechanism includes a bottom platform, a middle platform and a top platform. The crane mechanism is arranged on the top platform of the lifting mechanism, and includes a base and a crane on the base. The base is arranged on the top platform and is rotatable relative to the top platform along a vertical axis, and the hanger frame of the crane is movable between a vertical orientation and an inclined orientation. The lifting mechanism is configured to ascend and descend in the constructed steel structure hoistway, and the crane mechanism is configured to lift building materials, such as steel beams, steel columns, etc., for use in building the steel structure hoistway to their designed installation locations.

Abstract: An apparatus includes a receiver coil configured to be magnetically coupled to a transmitter coil, and a rectifier circuit coupled to two terminals of the receiver coil, wherein in response to a high system gain of the apparatus, the rectifier circuit is configured as a half-bridge rectifier, and in response to a low system gain of the apparatus, the rectifier circuit is configured as a full-bridge rectifier.

Abstract: An apparatus includes a controller configured to control switches of a rectifier circuit, wherein the rectifier circuit is coupled to two terminals of a receiver coil configured to be magnetically coupled to a transmitter coil of a wireless power transfer system, and wherein in response to a high system gain of the wireless power transfer system, the controller configures the rectifier circuit as a half-bridge rectifier, and in response to a low system gain of the wireless power transfer system, the controller configures the rectifier circuit as a full-bridge rectifier.

Abstract: A method includes configuring a wireless power transfer system to operate in a sleep mode to reduce a quiescent current of the wireless power transfer system, configuring the wireless power transfer system to operate in a magnetic detection mode, wherein in the magnetic detection mode, an excitation is applied to a resonant tank of the wireless power transfer system, detecting a signal having a resonant attenuation envelope, wherein the signal is generated by the resonant tank, and configuring the wireless power transfer system to operate in an active mode after finding an object is magnetically coupled to the wireless power transfer system.

Abstract: Embodiments of the present disclosure provide a driving circuit and a lamp comprising the same. The driving circuit comprises inputs connected to a mains supply; outputs connected to an LED load; an output capacitor connected in parallel with the LED load; an LED driving current source connected to the outputs, and configured to convert the mains supply at the inputs to current at the outputs in an illumination mode, such that the current flows through the LED load and charges the output capacitor; and a control circuit configured to receive a standby signal to enable a standby mode, and to control the mains supply to linearly charge the output capacitor in the standby mode, such that an output voltage at the output can be lower than a turn-on voltage of the LED load and is higher than a preset lowest voltage.

Abstract: An apparatus includes a controller configured to control switches of a receiver, the receiver comprising a first receiver coil configured to be magnetically coupled to a transmitter coil of a wireless power transfer system, a rectifier circuit coupled to two terminals of the first receiver coil, a second receiver coil and a first auxiliary switch, wherein the second receiver coil is connected in series with the first auxiliary switch, and the second receiver coil is configured to be magnetically coupled to the transmitter coil, and wherein in response to a low power mode of the apparatus, the controller is configured to turn on the first auxiliary switch such that the first receiver coil and the second receiver coil are connected in series to boost a gain of the wireless power transfer system.

Abstract: An apparatus includes a first receiver coil configured to be magnetically coupled to a transmitter coil, a rectifier circuit coupled to two terminals of the first receiver coil, a second receiver coil and a first auxiliary switch connected in series, wherein the second receiver coil is configured to be magnetically coupled to the transmitter coil, and in response to a low power mode of the apparatus, the first auxiliary switch is configured to be turned on such that the first receiver coil and the second receiver coil are connected in series to boost a gain of the apparatus.

Abstract: A method includes applying an excitation including a voltage step to a resonant tank comprising a first coil and a capacitor, comparing a damped sinusoidal waveform having a resonant attenuation envelope with a predetermined threshold voltage and detecting a last time instant at which a value of the damped sinusoidal waveform is equal to the predetermined threshold voltage, calculating a quality factor of the resonant tank based on a plurality of parameters derived from the last time instant, and determining whether a foreign object is magnetically coupled to the first coil based on the quality factor.

Abstract: A wireless power transfer system and a control method thereof. The wireless power transfer system includes: a transmitter coil configured to be magnetically coupled to a receiver coil; a power conversion device coupled to the transmitter coil; and a controller including a one-half cycle detection block, wherein the one-half cycle detection block is configured to establish a current sensing time instant, and wherein at the current sensing time instant, a current flowing through the transmitter coil is detected and compared to a predetermined threshold to perform foreign object detection to determine whether a foreign object is coupled to the wireless power transfer system.

Abstract: An apparatus includes a rectifier having a first input coupled to a first terminal of a receiver coil and a second input coupled to a second terminal of the receiver coil, wherein the rectifier is configured to convert an alternating current voltage into a direct current voltage, a first communication network connected to the first input of the rectifier, and a second communication network connected to the second input of the rectifier, wherein the first communication network and the second communication network are controlled independently to adjust a gain of a wireless power transfer system.

Abstract: A method includes wirelessly transferring power through a main coil of a wireless power transfer system, wherein the main coil is connected in series with a main resonant capacitor, and the main coil and the main resonant capacitor form a main resonant tank having a first resonant frequency, applying an excitation including a voltage step to an auxiliary resonant tank comprising an auxiliary coil and an auxiliary resonant capacitor, wherein the auxiliary resonant tank has a second resonant frequency different from the first resonant frequency, calculating a quality factor of the wireless power transfer system based on a plurality of parameters derived from a damped sinusoidal waveform obtained from the auxiliary resonant tank, and determining whether a foreign object is magnetically coupled to the wireless power transfer system based on the quality factor.

Abstract: An apparatus includes a rectifier having a first input coupled to a first terminal of a receiver coil and a second input coupled to a second terminal of the receiver coil, wherein the rectifier is configured to convert an alternating current voltage into a direct current voltage, a first communication network connected to the first input of the rectifier, and a second communication network connected to the second input of the rectifier, wherein the first communication network and the second communication network are controlled independently to adjust a gain of a wireless power transfer system.

Abstract: An apparatus includes a controller configured to control switches of a rectifier circuit, wherein the rectifier circuit is coupled to two terminals of a receiver coil configured to be magnetically coupled to a transmitter coil of a wireless power transfer system, and wherein in response to a high system gain of the wireless power transfer system, the controller configures the rectifier circuit as a half-bridge rectifier, and in response to a low system gain of the wireless power transfer system, the controller configures the rectifier circuit as a full-bridge rectifier.

Abstract: An apparatus includes a receiver coil configured to be magnetically coupled to a transmitter coil, and a rectifier circuit coupled to two terminals of the receiver coil, wherein in response to a high system gain of the apparatus, the rectifier circuit is configured as a half-bridge rectifier, and in response to a low system gain of the apparatus, the rectifier circuit is configured as a full-bridge rectifier.