37results about How to "Improve fever" patented technology

The invention discloses a multistage electromagnetic coil transmitter energy recovery circuit and an electromagnetic coil transmitter. The multistage electromagnetic coil transmitter energy recovery circuit comprises first to eleventh diodes, first to third capacitors, first to third coils, first to eighth transistors, and first to third switches. According to the invention, coil energy is recovered to each level of capacitor by controlling the conduction time sequence of each transistor, and after the discharge of the previous level of coil is completed and the energy is recovered to the previous level of capacitor, the energy recovered in the capacitor can be released to the next level of coil when the next level of coil is triggered. The current in the coil can be quickly returned to zero, energy is recycled and acts on the next-stage coil, coil heating and the coil dragging force effect are reduced, and the outlet speed and efficiency of the electromagnetic coil emitter are improved.

The invention discloses a green low-carbon road construction technical system based on a basalt product and a construction mode. The method comprises the following steps: (1) early-stage preparation work: roadbed excavation and material preparation; (2) paving plain soil, and spreading water, cement, basalt solid waste and an alkali-activated material; (3) mixing and curing a roadbed layer; (4) laying thin slurry layers; (5) pavement layer materials are laid, and a cement concrete pavement with basalt fiber reinforcements is formed; (6) installing a pavement intelligent temperature control system; and (7) maintaining the pavement layer. According to the green low-carbon road construction technical system based on the basalt product, the basalt solid waste is adopted as an improved soil roadbed material, the cement consumption and cost are saved, and the carbon emission in the road construction process is effectively reduced.

The utility model discloses a breast pump which comprises a milk bowl assembly, a breast pumping shield, a main machine and a heat dissipation body. A milk storage space is formed in the milk bowl assembly. The breast sucking shield is provided with a wide end and a narrow end, and the inner diameter of the breast sucking shield is gradually increased from the narrow end to the wide end; the main machine comprises a negative pressure pump, and the negative pressure pump is used for providing negative pressure for sucking milk for the breast pump; and the radiator is at least partially arranged between the negative pressure pump and the milk bowl assembly. By means of the mode, the heat dissipation body is arranged between the negative pressure pump and the milk bowl assembly, heat of the negative pressure pump is conducted to the gap between the milk bowl assembly and the main machine, so that the heat is diffused into air, or the heat is conducted to the milk bowl assembly, and therefore the problem that the main machine is heated can be effectively solved.

The 80w vehicle-mounted mobile phone wireless charging refrigeration and heat dissipation system comprises a charger main body, a semiconductor refrigeration module, a first thermistor installed on a PCBA board of the charger main body, a second thermistor installed on a coil of the charger main body, a first fan, an MCU control module, an AD acquisition module and a data storage module. Wherein the first thermistor and the second thermistor are electrically connected with the AD acquisition module; the AD acquisition module is used for preprocessing acquired data, converting an analog signal into a digital signal and sending the digital signal to the MCU control module; the MCU control module is electrically connected with the semiconductor refrigeration module and the first fan, the air speed of the first fan and the voltage of the semiconductor refrigeration module are intelligently controlled through the MCU control module, and generated cold air is blown into the charger body for rapid cooling; according to the system, cold air is blown to the charging equipment and the charger for cooling, so that the charging effect and the charging safety can be ensured, and the problem of high heat of a high-power (80w) charger is avoided.

The embodiment of the invention provides a display panel and a display device. The display panel comprises a first metal layer, sub-pixels and a pixel circuit. The first metal layer is provided with a slot, an electrode connecting wire is arranged in the slot, and the electrode connecting wire and the first metal layer are on the same layer; the first end part of the electrode connecting line is connected with the sub-pixel, and the second end part is connected with the pixel circuit; the electrode connecting lines connected with sub-pixels in the same pixel form a connecting line group, the electrode connecting lines in the connecting line group comprise first connecting lines and second connecting lines, and the first connecting lines and the second connecting lines are located in different open grooves; in the first direction, the first line segment of the first connecting line and the first line segment of the second connecting line are located on the two sides of the pixel. In at least one connecting line group, the first end portion of the first connecting line and the first end portion of the second connecting line are staggered in the first direction. The problem of local heating of the first metal layer due to large current can be improved, the risk that the local area is burnt out is reduced, and the performance reliability of the display panel is improved.

The utility model provides a blood pump which comprises a rotor assembly, a stator assembly and a shell, the rotor assembly and the stator assembly are arranged in the shell in a spaced mode in the rotation axis direction of the rotor assembly, the rotor assembly comprises an impeller, a power magnetic ring and a center shaft, and the blood pump further comprises a first magnetic bearing assembly. The first magnetic bearing assembly comprises a first inner magnetic bearing and a first outer magnetic bearing which are matched with each other, the first outer magnetic bearing is arranged on the inner wall of the shell, and the impeller, the first inner magnetic bearing and the power magnetic ring are all fixedly arranged on the center shaft; the rotor assembly can rotate around the axis of the rotor assembly so as to drive fluid to flow into and out of the shell, and in the power-on state, the rotor assembly can be spaced from the stator assembly by a first preset distance in the rotating process. All the components of the rotor assembly are fixed on the central shaft, so that the stability of relative positions of all the components is guaranteed, the overall structural strength of the rotor assembly is improved, the stability of operation of the blood pump is guaranteed, and the service life of the blood pump is prolonged.

The permanent magnet synchronous motor rotor structure comprises a magnetic conductive rotating shaft, a plurality of magnetic steel grooves are formed in the peripheral surface of the magnetic conductive rotating shaft, the magnetic steel grooves are distributed in the circumferential direction of the magnetic conductive rotating shaft, and permanent magnet magnetism gathering magnetic poles are arranged in the magnetic steel grooves. The permanent magnet magnetism gathering magnetic pole comprises a radial magnetic flux permanent magnet, a first tangential magnetic flux permanent magnet and a second tangential magnetic flux permanent magnet, and the first tangential magnetic flux permanent magnet and the second tangential magnetic flux permanent magnet are arranged on the two sides of the radial magnetic flux permanent magnet in the circumferential direction of the magnetic conductive rotating shaft. The magnetic flux directions of the first tangential magnetic flux permanent magnets and the second tangential magnetic flux permanent magnets are opposite, gaps are reserved between the adjacent magnetic steel grooves in the circumferential direction of the magnetic conductive rotating shaft, and soft magnetic adjustable magnetic poles are formed in the portions, between the adjacent magnetic steel grooves, of the magnetic conductive rotating shaft. The built-in induction motor for the electric spindle solves the problems that an existing built-in induction motor for the electric spindle is low in machining precision, low in efficiency, low in power density, large in motor size, low in control precision and slow in response time.

This utility model relates to an assembled cylindrical iron core, a primary component, and a linear motor. Extending axially, its cross-section is a polygonal ring, with the outer ring's edges corresponding to the inner ring's edges. The iron core is formed by sequentially assembling multiple core units circumferentially. Each core unit has a quadrilateral cross-section, with a first, second, third, and fourth side in sequence. The first and third sides are parallel, with the first side located inside the assembled cylindrical iron core and the third side located outside. The surfaces containing the second and fourth sides of each core unit are coated with an insulating layer. This utility model is based on the idea of ​​assembling a polygonal linear motor from flat linear motors. By segmenting and cutting the eddy current loop, it actively reduces eddy current losses, lowers thrust loss and eddy current losses under high operating speeds, and optimizes motor heating.

The utility model discloses a busbar bridge and switch cabinet busbar flexible connection structure, which belongs to the technical field of electrical equipment structures and comprises a busbar bridge and a busbar structure positioned in a switch cabinet. A flexible connection structure is arranged between the bus bridge and the busbar. The flexible connection structure comprises a braided belt which is arranged in the middle and can be bent and deformed and connecting plates located at the two ends. And the connecting plate is respectively connected with the bus bridge and the busbar. The flexible connection structure is adopted to adapt to the position change between the bus bridge and the busbar structure, the woven belt in the flexible connection structure can be bent and deformed, and when the distance between the bus bridge and the busbar structure changes, the woven belt can compensate the distance change between the bus bridge and the busbar structure in real time. According to the scheme, the conditions of stress, deformation and heating of a busbar joint caused by foundation settlement can be completely avoided, and the safety risk of electrical equipment is reduced.

The present application discloses a display panel and a display device, including a plurality of pixel areas, the pixel areas at least including light-emitting units of three primary colors, the display panel including an array substrate and a light-emitting device layer, the light-emitting device layer including at least one combined LED chip distributed in a preset pixel area, the combined LED chip including at least two light-emitting units, and at least one of the at least two light-emitting units is a red light-emitting unit, the number of green light-emitting units and blue light-emitting units in the preset pixel area is less than the number of red light-emitting units; wherein, in one frame time, the duty cycle of the light-emitting phase of the red light-emitting unit is less than 100%; in one frame time, the light-emitting time periods of different red light-emitting units in the same preset pixel area at least partially do not overlap, and the sum of the duty cycles of the light-emitting phases of multiple red light-emitting units is greater than or equal to 100%. The display panel provided by the present application can achieve both display effect and service life.

The invention relates to the field of generators. The multi-hoisting-position rotor disassembling and assembling tool comprises a first retaining ring arranged at the right end of a rotor in a sleeving mode, the right end of the first retaining ring is connected with a collecting ring or an exciter through a bearing, and the multi-hoisting-position rotor disassembling and assembling tool further comprises a second retaining ring arranged at the left end of the rotor in a sleeving mode; the left end of the second retaining ring is connected with an extension shaft through a bearing; the extension shaft comprises a first extension shaft, at least one second extension shaft and a third extension shaft; the right end of the second extension shaft is provided with a first flange and is connected with a first extension shaft through the first flange, and the left end of the second extension shaft is provided with a second flange and is connected with another second extension shaft or a third extension shaft through the second flange; a third flange matched with the second flange is arranged at the right end of the third extension shaft, and a lifting ring is arranged at the left end of the third extension shaft; the first flange, the second flange and the third flange are all connected with reinforcing plates, the reinforcing plates are arranged at equal intervals in a surrounding mode with the central axis of the extension shaft as the center line, and open holes are formed in the reinforcing plates. The requirements of stators with different lengths can be met, and meanwhile the hoisting position is more flexible.

The invention discloses a power device and a current gain test method thereof. The current gain test method of the power device comprises the following steps: providing a to-be-tested power device; the to-be-tested power device comprises a base electrode, a collector electrode and an emitter electrode; electrically connecting the to-be-tested power device to the current gain test equipment; variable voltage is applied between the base electrode and the emitter electrode, and fixed voltage is applied between the collector electrode and the emitter electrode, so that a current gain test is carried out on the power device; wherein the fixed voltage is greater than the peak voltage of the variable voltage. According to the technical scheme of the embodiment of the invention, electrons can be prevented from being crowded in the base region, so that the power device always keeps high current gain, the current gain is kept stable, and the working stability of the power device is improved.

The embodiment of the utility model provides a charging circuit and a mobile power supply device, and belongs to the technical field of charging, the charging circuit comprises a wireless charging coil, a charging module, a power supply management module and a battery module, the wireless charging coil is used for supplying power to equipment to be charged; a first port of the charging module is connected with the wireless charging coil, and the charging module is used for being in communication connection with the to-be-charged equipment and obtaining charging voltage required by the to-be-charged equipment; a first port of the power management module is in communication connection with a second port of the charging module, and a second port of the power management module is connected with a third port of the charging module; the battery module is connected with the power management module; wherein the power management module is used for boosting the output voltage of the battery module according to the charging voltage, and according to the embodiment of the invention, the cost can be reduced while the charging efficiency is guaranteed, and the use experience of a user can also be improved.

A light-absorbing and heating fabric and a manufacturing process thereof belong to the field of fabrics, the light-absorbing and heating fabric structurally comprises a multi-layer fabric body, the multi-layer fabric body comprises a surface layer, an inner layer and a middle layer, the middle layer is arranged between the surface layer and the inner layer, and middle layer yarns of the light-absorbing and heating fabric contain mineral substances, effectively absorb sunlight and artificial light energy and convert the sunlight and the artificial light energy into heat energy; the temperature of the fabric is increased, the surface layer, the inner layer and the middle layer form an isolated structure through the polyester silk columns, air is contained in each yarn, an air protection layer is formed and used for locking heat loss, the heating and heat preservation performance is greatly improved, and the skin of a wearer can feel more directly.

The invention relates to a light-emitting element control circuit, a control method and electronic equipment. The light-emitting element control circuit comprises a power output module and a driving module, the power output module is electrically connected with the driving module; the driving module is electrically connected with the light-emitting element; the driving module is used for providing driving voltage for the light-emitting element and feeding back the driving voltage to the power output module; and the power output module is used for providing working voltage for the driving module and controlling the voltage difference between the working voltage and the driving voltage to be constant according to the acquired driving voltage. According to the invention, the heating phenomenon of the driving module can be improved, the number of light-emitting element channels conducted by the driving module can be increased, and the channel utilization rate is improved.

The application discloses a single-phase photovoltaic energy storage converter and a control method thereof, relates to the technical field of photovoltaic charging and discharging control, and comprises a front-stage bidirectional power conversion unit, a rear-stage single-phase inversion unit, an integrated main control unit and a wide-voltage adaptation control unit. The input end of the front-stage bidirectional power conversion unit is used for being connected with a direct-current power supply, and the output end is connected with the direct-current bus end of the rear-stage single-phase inversion unit. The output end of the rear-stage single-phase inversion unit is used for being connected with a power grid or a load. The integrated main control unit is electrically connected with the front-stage bidirectional power conversion unit, the rear-stage single-phase inversion unit and the wide-voltage adaptation control unit respectively, and is configured to perform integrated collaborative control of double-mode switching, power conversion, battery management and energy scheduling. The wide-voltage adaptation control unit is connected with the front-stage bidirectional power conversion unit, and the front-stage bidirectional power conversion unit is configured to work in full-condition soft switching within a wide direct-current input voltage range.

The invention provides a low-cost emergency inversion switching-off device. The low-cost emergency inversion switching-off device is characterized in that a mounting plate with air holes is mounted at the position, close to the middle, of the interior of a shell, and a power supply, a starting switch, a public switch and a door lock switch are mounted at the positions, close to one side, of the back face of the mounting plate; a control circuit, an oscillating circuit, a semiconductor switch and an inverter transformer are installed at the positions, close to the middle, of the back face of the mounting plate, and a voltage regulating circuit and a voltage collector are installed at the positions, close to the other side, of the back face of the mounting plate. According to the low-cost emergency inversion switching-off device provided by the invention, the power supply can be used for supplying power to the electromagnetic coil in an emergency manner and changing the power supply voltage of the electromagnetic coil in a delayed manner through the inversion switching-off device, so that the heating and power consumption of the electromagnetic coil during operation are reduced, and the damage to an inverter caused by power failure is reduced; and the practical cost of emergency inversion switching-off is reduced.

The invention provides an inner cavity VCSEL epitaxial structure, and belongs to the technical field of semiconductor lasers, the inner cavity VCSEL epitaxial structure comprises an epitaxial wafer, the epitaxial wafer comprises a GaAs substrate, an n-region undoped DBR, an n-type DBR, a quantum well active region, an oxide layer, a p-type DBR and a p-region undoped DBR, a thicker In0. 49Ga0. 51P layer matched with a GaAs substrate lattice is inserted between distributed Bragg reflectors on the two sides of the active region, and the quantum well active region is provided with an N-region undoped DBR, an N-region undoped DBR, an N-region undoped DBR, an N-region undoped DBR and an N-region undoped DBR. The layer is exposed by etching and then an ohmic contact electrode is fabricated thereon to form inner cavity contact. The number of pairs of serially connected DBRs is reduced through inner cavity contact, and the series resistance of the chip can be greatly reduced. In addition, the band gap width of the In0. 49Ga0. 51P layer is 1.88 eV which is much larger than 1.42 V of GaAs, and the In0. 49Ga0. 51P layer does not contain an aluminum component which is easy to oxidize, so that the defect that an AlGaAs inner cavity contact layer is easy to oxidize when exposed and the negative effect that GaAs is easy to absorb in short-wave band light are improved. By adopting the structure, the series resistance and heating of the device can be more flexibly controlled, and the photoelectric conversion efficiency and reliability of the chip are better.

The invention relates to an energy storage inverter circuit, an energy storage inverter method, an energy storage system and electronic equipment, the energy storage inverter circuit comprises a voltage conversion module, a pre-charging module and a detection control module, the polarity of a first battery end access signal is detected through the detection control module, and a positive electric signal is accessed to the first battery end; under the condition that the pre-charging module finishes pre-charging, the connection between the first battery end and the voltage conversion module is conducted, so that the pre-charging module is short-circuited, and the energy storage battery provides a charging signal to the voltage conversion module, and therefore, reliable battery reverse connection protection can be realized by utilizing a simple polarity detection function; the damage to the energy storage inverter circuit and the battery is avoided, the charging safety and reliability are improved, the loss is low, the battery can be used for a lead-acid battery and a lithium battery, and the adaptability is wide; reverse connection protection of the battery is achieved, meanwhile, the pre-charging module can be short-circuited after pre-charging is completed, and the heating problem is solved.

Disclosed are an electromagnetic induction heating coil and a method for manufacturing the same, the heating coil including a conductive portion that generates a magnetic field when a current passes through the conductive portion, and a cladding portion that closely winds the conductive portion from an outer periphery and defines a cross-sectional shape thereof perpendicular to a current direction, the conductive part comprises a plurality of strands of conductive wires, and is characterized in that the conductive part is limited in a space with a rectangular cross section by the coating part, the conductive wires are wires with polygonal cross sections, and the conductive wires meet the condition that C: S is greater than 45mm <-1 >. According to the heating coil, the electrified sectional area can be effectively utilized, meanwhile, the influence of the skin effect is smaller, the safe current-carrying capacity of a coil conductive wire can be effectively increased, coil heating during working of an electromagnetic induction appliance is effectively improved, and the heating coil is smaller in relative size, thinner in thickness and easier to produce and wind.

The invention discloses a large-current, flexible charging pile fast-charging external connection cable and a preparation method thereof. The outer layer of fluoroplastic of the cooling tube of the main core wire plays a role of heat resistance and insulation, and the inner layer of foamed polyethylene with a foaming degree of 65-85% not only increases the volume of the coolant but also plays an effective supporting role. More importantly, when preparing the hollow flexible conductor of the main core wire, due to the improved compressive strength of the cooling tube, after all the conductor wires are grouped and bundled, the cooling tube can be used as a support and then twisted to form a wire, which can effectively increase the softness of the cable. The cable is easier to install than the cable of a conventional cooling device, has a smaller bending radius and a larger current carrying capacity; in addition, a temperature-sensitive optical fiber is added during the molding of the hollow flexible conductor, and the coolant flow rate can be controlled according to the feedback temperature to keep the cable temperature constant; the above multiple effects greatly improve the charging speed of the cable, greatly improve the heating problem of the cable, effectively reduce the insulation aging speed, increase the service life of the cable, and make the product more flexible.

The utility model relates to the technical field of electronic equipment, in particular to an energy supply device and electronic equipment. The energy supply device comprises a shell and a power supply structure; the shell is provided with a charging seat; the power supply structure comprises a first contact, a first battery and a control module, the first battery is arranged in the shell, the control module is electrically connected to the first contact, the first battery and the charging base, and at least part of the first contact protrudes outwards from the shell and is used for supplying power to an external power receiving device; and the connecting piece is connected to the shell, and the connecting piece is used for being fixedly connected with a power receiving device. According to the energy supply device of the embodiment, wired power supply and wireless power supply can be achieved through cooperation of the charging base and the first battery, and convenience is improved; the first contact is connected with the power receiving device, compared with wireless charging, the heating condition of the equipment can be improved, the structure is simple, and the using effect is good.

This invention discloses a method and a motor for remanufacturing an asynchronous motor into a synchronous reluctance motor, relating to the field of motor remanufacturing and solving the problem of high-efficiency remanufacturing of asynchronous motors. This invention disassembles and recycles most of the materials from old, low-efficiency asynchronous motors, retaining the stator assembly and several accessories. New synchronous reluctance rotor laminations are manufactured and reassembled with the original asynchronous motor's stator assembly and accessories. The newly manufactured synchronous reluctance rotor laminations are equipped with several air grilles. This invention can improve the energy efficiency level of the original motor, achieving the performance of a high-efficiency motor. This technical method can improve the operating efficiency of old motors and make full use of existing materials, significantly reducing costs compared to purchasing a new high-efficiency motor, thus lowering the investment costs for users upgrading to high-efficiency motors.

The invention discloses energy-saving high-precision roll finishing equipment, and relates to the field of machining equipment. The problems that an existing rolling machine tool is complex in control mode, the stress state of a rolling part is poor, rolling force is limited by friction force, the loading capacity range of the rolling force is small, the quality of a machined part is low, and the diameter of the machined part is limited by the deflection angle capacity of a coupler are solved. A driving side transmission system is installed on a driving rolling wheel side supporting clamp, a driven side transmission system is installed on a driven rolling wheel side supporting clamp, the other end of the driving side transmission system is connected with one end of the driven side transmission system through a telescopic coupler, and the driving side transmission system and the driven side transmission system are both meshed with a rolling piece. The torque loading motor is connected with the driving side transmission system to control the transmission torque of the rolling piece, and the rotating speed control motor is connected with the driven side transmission system to control the rotating speed of the rolling piece. The rolling device is used for improving the stress stability in the rolling process and meanwhile widening the diameter application range of a rolling piece.

The invention provides a semiconductor structure and a preparation method thereof, a chip packaging structure and a storage system, relates to the technical field of semiconductors, and aims to reduce the overall power consumption of the semiconductor structure, improve the heating problem of the semiconductor structure and improve the performance of the semiconductor structure. The semiconductor structure includes a plurality of dies disposed in a stacked manner. At least one of the dies includes a first portion and a second portion. In a cross section of the bare chip perpendicular to a first direction, the first portion and the second portion are adjacent to each other, and the first direction is a thickness direction of the bare chip. Wherein the first part comprises a storage unit array, and the second part comprises a storage and calculation integrated unit array. Comprising the semiconductor structure can be applied to a storage system to realize data reading and writing operations.

The utility model relates to the technical field of lifesaving lamps, in particular to a double-color lifesaving lamp, which solves the problems that the existing double-color lifesaving lamp with ultraviolet light and white light is complicated in production and assembly, inconvenient in streamlined and automatic production, high in part cost and the like, and comprises a lampshade, a lamp panel is wrapped in the lampshade, the lamp panel is arranged in a lamp holder, and the lamp holder is arranged on the lamp holder. The lampshade wraps the lamp panel and then adheres to the lamp holder, the lamp panel is connected with a wire, the wire is led out of the lamp holder to be connected with a battery, the lamp panel is connected with a white light LED lamp and an ultraviolet LED lamp, and the LED lamp has the advantages of being high in integration, small and exquisite in size, light in weight, easy to produce and assemble, capable of achieving streamlined and automatic production, low in part cost and the like.

The utility model discloses a heat-insulating and warm-keeping polyester composite fabric which comprises a base cloth layer, a warm-keeping layer, a heat-insulating layer, a waterproof layer and a wear-resisting layer which are sequentially compounded, the base cloth layer is made of 400D terylene oxford cloth; the heat insulation layer comprises a first fabric layer, a heat insulation material and a second fabric layer which are arranged in sequence, and the first fabric layer, the heat insulation material and the second fabric layer are compounded through quilting; and the waterproof layer is a polytetrafluoroethylene waterproof breathable film. Based on the heat-insulating and warm-keeping terylene composite fabric, the warm-keeping layer realizes a good warm-keeping effect by utilizing the characteristics of high moisture regain, strong moisture absorption capability and excellent heating effect of the moisture absorption and heating yarns; the heat insulation layer achieves the heat insulation effect by filling a containing cavity formed by the first fabric layer and the second fabric layer with a heat insulation material. The polytetrafluoroethylene waterproof breathable film has waterproof and breathable effects; the wear-resistant layer formed by interweaving the ultra-high molecular weight polyethylene fiber filaments can protect the heat-insulating and warm-keeping terylene composite fabric from being worn and damaged easily during use, and the heat-insulating and warm-keeping terylene composite fabric has long service life.

The invention discloses a brushless direct current motor locked-rotor current management method, which belongs to the technical field of motor control, and comprises the following steps: S1, monitoring the rotating speed of a motor in real time, judging whether the rotating speed of the motor is a stalling speed or not, and if the rotating speed of the motor is the stalling speed, stopping the motor; if the rotating speed of the motor is not the stalling speed, entering the step S2; s2, performing locked-rotor detection on the motor, and judging whether the motor has a locked-rotor trend or not; and S3, after it is detected that the motor has a locked-rotor trend, locked-rotor current management is involved, and convergence control is performed on the U-phase current, the V-phase current and the W-phase current of the motor based on the current phase current peak value and the current electrical angle of the motor. According to the brushless direct current motor locked-rotor current management method provided by the invention, the locked-rotor current is managed when the motor is locked, and the problem that a power device is damaged due to overall temperature rise caused by locked-rotor can be avoided.

This utility model discloses an external device circuit for output control of a charging pile, specifically relating to the field of charging piles. It includes a PCB board on which a microcontroller unit, a Q14 input module, an optocoupler chip, a Q5 output module, and terminal blocks are integrated. This utility model outputs a high-level signal through the microcontroller unit and inputs it to the base of transistor Q14 through resistor R10. Under the action of resistor R342, the current flowing through the collector of transistor Q14 is approximately 20mA. At this time, the input current of the optocoupler is also 20mA. To ensure normal operation even under extreme conditions, the current transfer ratio of the optocoupler is minimized, resulting in an output current of approximately 10mA. In this case, transistor Q5 and the optocoupler combine to form a composite transistor to enhance the output current, preventing insufficient output drive capability when high current output is required. This circuit, which can be implemented with simple components such as optocouplers, transistors, and resistors, is low in cost.

The application relates to the technical field of mechatronic systems, and particularly discloses a low-temperature cold start control method based on high-frequency injection, which comprises the following steps: analyzing the motor state, observing and feedforward compensating the disturbance caused by the load torque and the viscous coefficient to the motor state through a sliding mode observer algorithm; obtaining a state equation according to the motor state, constructing an extended sliding mode observer equation, deriving an observer error equation, and observing the load torque; analyzing the obtained load torque, and reflecting the oil viscosity through the motor load torque; injecting high-frequency current under the low-temperature state according to the oil viscosity result, controlling the injection frequency, enhancing the skin effect, controlling the current amplitude, utilizing the copper loss and the high-frequency magnetic field eddy current effect to assist heat generation, gradually reducing the injection voltage amplitude according to the final oil viscosity result, the electromagnetic heat generation viscosity and the load reduction, and switching to normal id=0 control after reaching the normal start condition.