6results about How to "Reduce voltage loss" patented technology

The invention discloses a control circuit and a control method of a power switch tube, and a switching power supply, and belongs to the technical field of switching power supplies. The control circuit of the power switch tube comprises a first P-type MOS tube, the source electrode of which is connected with a power supply voltage node and the drain electrode of which is connected with the driving end of the power switch tube; the drain electrode of the first N-type MOS tube is connected with a power supply voltage node, and the source electrode of the first N-type MOS tube is connected with the driving end of the power switch tube; the driving circuit is connected with the grid electrode of the first P-type MOS tube and the grid electrode of the first N-type MOS tube, drives the first P-type MOS tube to be conducted when the control signal of the power switch tube is a conduction signal and the power supply voltage of the power supply voltage node is smaller than the reference voltage, and drives the first N-type MOS tube to be conducted when the control signal of the power switch tube is a conduction signal and the power supply voltage is larger than or equal to the reference voltage. And the first N-type MOS tube is driven to be conducted, so that the voltage loss caused by the threshold loss of the power tube is reduced, and the driving capability of the driving circuit when the power supply voltage is relatively low is improved.

This utility model discloses a control device for a dual-winding stepper motor, relating to the field of stepper motor drive technology. It includes: a first winding control device and a second winding control device for controlling the two winding coils of a dual-winding stepper motor. Both the first and second winding control devices include a data acquisition and output unit and connected to it a main control unit, an operation display unit, a drive unit, and a power supply unit. They also include a maintenance unit connected to the main control unit and the drive unit. The output terminal of the drive unit is connected to the winding coils, and the main control unit, data acquisition and output unit, and drive unit are all connected to the power supply unit. The two drive units are interconnected. This utility model utilizes digital technology and modular design, making the system's control and monitoring more precise and flexible. Furthermore, each module can be independently designed, tested, and maintained.

The invention relates to the field of perovskite solar cells, and discloses a perovskite solar cell, a preparation method thereof and a solar cell module. The perovskite solar cell comprises a hole transport layer, a functional layer and a perovskite layer which are stacked in sequence. Wherein the functional layer comprises a first functional layer and a second functional layer; the first functional layer and the second functional layer respectively and independently comprise self-assembly molecules. The first functional layer and the second functional layer adjust energy level matching between the hole transport layer and the perovskite layer, passivate interface defects and improve cell performance.

The application relates to the technical field of photovoltaic modules, in particular to a laminated cell, a preparation method thereof and a photovoltaic module. The laminated cell comprises a top cell unit, a bottom cell unit and a composite layer between the top cell unit and the bottom cell unit. The composite layer comprises a plurality of spaced rod bodies, the rod bodies extend along a first direction, and the rod bodies have a first doping element. The rod bodies at least have a first part and a second part which are stacked, and the doping concentration of the first part is different from that of the second part. The structure of the rod bodies which are spaced and extend along the first direction in the composite layer can form a vertical carrier transport channel in the composite layer, the diffusion path of the carriers is shortened, and thus the carrier transport rate is improved. Meanwhile, by adjusting the doping concentrations of the first part and the second part, the conduction band energy levels of the first part and the second part can be adjusted, so that the potential barrier of the carriers during transmission in the composite layer is reduced, and voltage loss is reduced.

This invention discloses a perovskite thin film, a perovskite device, and a preparation method thereof. The preparation method of the perovskite thin film includes: coating a perovskite precursor solution onto a substrate to form a liquid film; removing at least a portion of the solvent from the liquid film using a vacuum process to form an intermediate phase film; and performing an annealing treatment to form the perovskite thin film; wherein the perovskite precursor solution contains an excess of A-site cations. The preparation method provided by this invention effectively compensates for the loss of A-site cations during the vacuum process, inhibits the formation of residual B-site cation salts, reduces device voltage loss, increases the grain size of the perovskite thin film, improves carrier transport and extraction, and increases the short-circuit current of the device; it is simple and easy to implement, low in cost, and requires no additional steps, making it suitable for the preparation of large-area perovskite thin films; it reduces the number of steps in perovskite device preparation, lowers material costs, and facilitates industrial development.

This invention discloses a lubricating oil metal shavings detection device, including an oil shavings separator connected to a sliding pipeline. A shavings sensor is installed on one side of the oil shavings separator, and the shavings sensor is connected to a shavings conditioner via a cable. The oil shavings separator can place metal shavings and lubricating oil in the lubricating oil below the shavings sensor and expel air from the lubricating oil from the top. The shavings sensor generates an induced voltage based on the metal shavings detected below and transmits the induced voltage signal to the shavings conditioner via the cable. The shavings conditioner can collect the number and size of the shavings based on the induced voltage transmitted by the shavings sensor and transmit this information to a host computer. In this invention, the shavings sensor uses a permanent magnet as the magnet, which can generate a stable magnetic field, has strong anti-interference ability against electromagnetic fields, and has more stable performance. The induced voltage in the induction coil is enhanced by increasing the lubricating oil flow rate. The entire device is a mechanical structure and is not affected by aircraft electromagnetic interference.