36results about How to "Small self loss" patented technology

The invention relates to electronic product, especially disclosing a control method and system for Li battery charging in an electronic product. And a charging control method comprises the steps of: A1. detecting Li battery capacity and starting charging the Li battery and executing step A2 when the capacity is equal to or less than a first lower limit value; and A2. real-time detecting the Li battery capacity in the charging course and stopping charging and returning to the step A1 when the capacity is equal to or more than a first upper limit value. And it can combine with the existing techniques, meeting different occasions. And the charging system comprises Li battery module, charging module, detection module and storage module, as well as two control modules and charging mode management module.

The invention discloses a high-stability corrosion-resistant long-life communication transformer and a manufacturing method thereof. The communication transformer comprises a framework, a winding, a magnetic core, a shielding cover and a packing material, and is characterized in that the framework is an alumina-based porous foam ceramic framework with a porosity of 20-30%; the winding adopts a purple copper wire with epoxy polyester insulating paint; the magnetic core is a molybdenum pomo magnetic core which is shaped like a Chinese character 'ri'; a self-circulation insulating heat transfer filler is filled in gaps between the shielding cover and other parts, and the self-circulation insulating heat transfer filler is a mixture of alumina-based porous foam ceramic and rosin; the shieldingcover is made of titanium-containing low-carbon steel with activated and passivated surface and is packaged in a totally-enclosed structure. The communication transformer has the advantages of smallloss, high conversion efficiency, good electromagnetic shielding property, good insulation property, corrosion resistance, oxidation resistance and long service life.

The invention provides a telemetering system power supply device and control method for testing a rotating member. According to the power supply device, a control panel is connected with a battery through lead bonding, wherein the control panel comprises a microcontroller, a circuit protection unit, a first linear voltage regulator, a second linear voltage regulator, a switch control unit, a hallswitch sensor and an indicator light; the microcontroller senses a magnetic field change through the hall switch sensor, outputs a control signal to the switch control unit and carries out real-time indication on the working state through the indicator light; and the microcontroller, the circuit protection unit and the first linear voltage regulator are combined to provide the control panel with apower supply. The control method comprises the steps of collecting magnetic intensity signals; screening data; outputting a control signal; and carrying out battery state monitoring and state indication. A difficulty in power supply control on the battery of a telemetering system rotating part for the rotating member is avoided, the design difficulty of hardware is reduced, the volume of the hardware is reduced, the power consumption of the hardware is reduced and the stability and the interactivity of the device are improved.

The invention discloses a multi-mode control method for a photovoltaic grid-connected inverter with a duplex parallel structure. Real-time detection is performed on the output power of the photovoltaic grid-connected inverter; when the output power of the inverter is less than 2 percent of rated power, the inverter enters a stand-by state, and two sets of inversion unit modules respectively stop working; when the output power of the inverter is greater than 2 percent of the rated power and less than 45 percent of the rated power, the inverter enters a low-power state, and only one set of inversion unit modules is started to work; when the output power of the inverter is greater than 45 percent of the rated power, the inverter enters a high-power state, and the two inversion unit modules are both in a working state. According to the multi-mode control method for the photovoltaic grid-connected inverter with the duplex parallel structure, disclosed by the invention, under the stand-by mode, the two sets of inversion unit modules stop working; under the low-power mode, only one set of inversion unit modules works; under the high-power mode, the two sets of inversion unit modules work simultaneously, and thus, the daily loss of the inverter is reduced; the multi-mode control method for the photovoltaic grid-connected inverter with the duplex parallel structure, disclosed by the invention, has the advantages of being low in switching frequency, small in self-loss, small in output harmonic, and the like, and a greener energy resource can be provided for power grids.

The invention discloses a high-stability high-reliability self-circulating three-winding autotransformer and a manufacturing method thereof. The three-winding autotransformer comprises a framework, windings, a magnetic core, a shielding cover and a packaging material and is characterized in that the framework is an alumina-based porous foamed ceramic framework with the porosity of 20-30%; the windings adopt red copper wires with 1140 epoxy polyester insulating varnish; the magnetic core is a B-shaped silicon steel sheet magnetic core; gaps between the shielding cover and other parts are filledwith self-circulating insulating heat transfer filler, and the self-circulating insulating heat transfer filler is a mixture of alumina-based porous foamed ceramic, non-vulcanized silica gel and gumrosin; the shielding cover is made of aluminum alloy and packaged by a full-closed structure. The autotransformer has the advantages of small loss, high conversion efficiency, good electromagnetic shielding performance, good insulation, high cost performance and long service life.

The invention relates to the field of manufacturing of thermal batteries and normal-temperature lithium primary battery electrode materials, in particular to a method for preparing a core-shell composite sulfide material through a two-step method. The method comprises the following steps: forming a metal cobalt layer which is uniformly distributed on the surface of FeS2 powder particles through a chemical plating method to obtain a precursor material; then carrying out vulcanization treatment on the precursor material; and obtaining the core-shell composite sulfide material. When the prepared shell cobalt disulfide accounts for 2.5-14.6% of the total mass of the core-shell composite sulfide material, the core-shell composite positive electrode material is used as a positive electrode material; after a thermal battery is assembled, the thermal battery is subjected to constant-current discharge at the working temperature of 520 DEG C and the current density of 200mA/cm < 2 >, and when the cut-off voltage is 1.6 V, the specific discharge capacity of the thermal battery is up to 331mAh/g. The preparation operation method is reliable, the cost is low, the obtained product has excellent thermal stability and electrochemical performance, and large-scale industrial production is facilitated.

The invention discloses a series lithium battery pack voltage balancing device and a control method, the series lithium battery pack voltage balancing device is used for a battery pack Pack1 and a battery pack Pack2 which are connected in series, two ends of a capacitor C1 are connected to two ends of the battery pack Pack1 and the battery pack Pack2 which are connected in series, one end of a first switch S1 is connected with one end of the capacitor C1, the other end of the first switch S1 is connected with one end of a first inductor L1 and an anode of a first diode D1, and the other end of the first inductor L1 is connected with the anode of a second diode D1. The other end of the first inductor L1 is connected to the joint of the battery pack Pack1 and the battery pack Pack2, one end of the second switch S2 is connected with one end of the second inductor L2 and the cathode of the second diode D2, the other end of the second switch S2 is connected with the other end of the capacitor C1, the anode of the second diode D2 is connected with one end of the capacitor C1, and the other end of the second diode D2 is connected with the other end of the capacitor C1. The other end of the second inductor L2 is connected to the joint of the battery pack Pack1 and the battery pack Pack2, and the duty ratio of the first switch S1 and the duty ratio of the second switch S2 are controlled through a controller. Energy conversion in the series battery pack can be achieved, and the purpose of balancing the series battery pack is achieved.

A pulse magnetic shock catapult comprises a power supply, a power supply control panel, a U-shaped catapult guide rail connected with the power supply control panel and a catapult tractor arranged onthe U-shaped catapult guide rail in a sliding connection mode, the catapult tractor is a sliding block of a frame structure, and at least four pairs of magnets which are symmetrically arranged up anddown and have alternate positive and negative magnetic poles are embedded in the sliding block; silicon steel sheet winding unit arrays formed by connecting windings in series in the length directionare symmetrically embedded in the left side wall and the right side wall of the U-shaped catapult guide rail; each silicon steel sheet winding unit comprises two oppositely-arranged coils, the power supply supplies power to the silicon steel sheet winding unit to generate a magnetic field, and the power supply is a super-power variable-frequency pulse generator. The catapult is simple in structure, low in technical difficulty, low in manufacturing cost, convenient to maintain and remarkable in energy conservation. Under the same condition, compared with an existing electromagnetic catapult using a permanent magnet linear synchronous motor, energy is saved by at least 40%. Power is supplied in a ground-wire-free mode, the pulse amplitude can be reduced, the consumption of an electric brushis reduced, and a ground wire is omitted.

The invention belongs to a pressing device used for welding, in particular to a pressing device for welding of a battery production line. The pressing device mainly solves the technical problems that a pressing device commonly used in current production is complex in adjusting step, error compensation cannot be performed, and the fixing stability degree is low. According to the technical scheme, the pressing device for welding of the battery production line is composed of three parts of an upper floating pressing board assembly, a lower carrying board assembly and an installation bottom board, and the upper floating pressing board assembly and the lower carrying board assembly are fixed to the installation bottom board. A bottom board of the upper floating pressing board assembly is fixed to the installation bottom board. A supporting board is in a bent-arm shape. The lower end of the supporting board is fixed to the bottom board. An air cylinder installation board is fixed to the upper end of the supporting board. A downward-pressing air cylinder is fixed to the air cylinder installation board. A connecting board is fixed to an output shaft of the downward-pressing air cylinder. The connecting board is connected with a fixing seat through elastic pins. A rotary shaft is sleeved with the fixing seat. A floating swing seat is installed on the fixing seat. An upper pressing board seat with an upper floating pressing board is installed on the floating swing seat. The lower carrying board assembly comprises a support, a cushion board and a lower carrying board. The support is fixed to the installation bottom board and provided with the cushion board. The lower carrying board is fixed to the cushion board. The pressing device is used for pressing polar bands and polar lugs on the battery production line in a floating manner in the welding process.