65results about How to "Avoid severe fever" patented technology

The invention discloses a flip-chip LED chip structure and a manufacturing method thereof. The LED chip comprises an epitaxial layer taking sapphire as substrate and an electrode layer taking SiO2 / Si as substrate; holes of periodical structure are etched on the front surface of the sapphire substrate, and random patterns are etched on the back surface; a growth buffer layer, an n type GaN layer (n-GaN), an MQWs (multi quantum wells) layer and a p type GaN layer (p-GaN) are successively grown on the sapphire substrate etched with holes as the epitaxial layer; one or more negative electrode grooves are etched on the p type GaN layer (p-GaN); a p type contact layer is sputtered on the p type GaN layer (p-GaN); an n type ohmic contact layer is electroplated on the n type GaN layer (n-GaN) exposed after etching; titanium (Ti), platinum (Pt) and aurum (Au) are successively deposited on the SiO2 / Si substrate as an electrode layer; the electrode distribution on the electrode layer is coincident with that on the etched epitaxial layer; and the LED chip is formed by bonding the epitaxial layer on the front surface of the sapphire substrate and the electrode layer on the SiO2 / Si substrate with Au solder. The structure has the advantages of stable performance, high utilization rate of electric energy and long service life.

The invention discloses an electromagnetic heating cooking device, and a heating control circuit and a low power heating control method thereof. The low power heating control method includes the steps of controlling the electromagnetic heating cooking device to perform the intermittent heating by using a wave losing method when a low power heating command is received; detecting a voltage zero crossing signal of an input AC power supply; when the electromagnetic heating cooking device is controlled to switch from the stop heating zone to the heating zone, outputting a first control signal to a drive unit in a first time period before the zero crossing point according to the voltage zero crossing signal, and after the zero cross point, outputting a second control signal to the drive unit in a second time period, wherein the voltage amplitude of the first control signal is equal to the voltage amplitude of the second control signal and the pulse width of the first control signal is smaller than the pulse width of the second control signal. The impact current is reduced at the time of its hard turn-on by changing the pulse width of the control signal of the power switch tube, thereby reducing the risk of damage to the power switch tube.

The invention discloses a battery management method and system applied to a battery management chip. The system comprises a battery module, a maximum determining circuit, a minimum determining circuit and a balance module, wherein the battery module comprises a first battery to an Nth battery; N is an integer not smaller than 2; the maximum determining circuit is used for obtaining first voltage to Nth voltage, which correspond to the first battery to the Nth battery one by one and determining maximum voltage from the first voltage to the Nth voltage to be the maximum voltage; the minimum determining circuit is used for obtaining the first voltage to the Nth voltage, which correspond to the first battery to the Nth battery one by one and determining minimum voltage from the first voltage to the Nth voltage to be the minimum voltage; and the balance module is used for balancing voltage corresponding to the maximum voltage when the minimum voltage is greater than a balance start threshold and a voltage difference between the maximum voltage and the minimum voltage is greater than a voltage difference threshold. The condition that multiple batteries are simultaneously balanced forcibly when the batteries do not need to be balanced is avoided and the balancing effect is relatively good.

The invention discloses an input-voltage-self-adaption-based current frequency limiting method and apparatus of a power factor correction (PFC) circuit in a variable-frequency air conditioner. The output terminal of the PFC circuit is connected with a load being a compressor. The method comprises the following steps: obtaining a voltage effective value Vin_rms and a current effective value Iin_rms; obtaining a current frequency-limiting threshold value based on the input voltage effective value Vin_rms and controlling the compressor according to the current effective value Iin_rms and the current frequency-limiting threshold value; and controlling the compressor to carry out frequency-reduction operation when the current effective value Iin_rms being larger than the current frequency-limiting threshold value. Therefore, the output power is reduced; an objective of input current reduction is achieved; the heating situation of the input circuit is improved; and the system reliability is enhanced.

The invention discloses an electromagnetic heating apparatus and a heat control circuit and a low-power heat control method thereof. The heat control circuit comprises a voltage zero-crossing detection unit, a resonance heating unit, a rectifying and filtering unit, a power switch tube, a driving unit, a driving voltage transformation unit and a main control unit, wherein the voltage zero-crossing detection unit is used for detecting a voltage zero-crossing signal of an alternating current power supply; the driving unit is connected with the driving end of the power switch tube to drive the switch-on and switch-off of the power switch tube; the driving voltage transformation unit is connected with the driving end of the power switch tube to change the driving voltage of the power switch tube; the main control unit controls the power switch tube to work under drive of a first driving voltage according to the voltage zero-crossing signal before the zero-crossing point of the alternating current power supply through judgment, and controls the power switch tube to work under drive of a second driving voltage when the collector voltage of the power switch tube oscillates to be the minimum, so as to start the power switch tube in a voltage transformation manner, in order to lower the risk of damage of the power switch tube and lower switch-on noise.

The invention relates to a maglev traction device of a high-temperature superconducting high-speed maglev train, and belongs to the technical field of intelligent devices. The traction device comprises a high-temperature superconducting maglev device and a traction power device; the high-temperature superconducting magnetic levitation device comprises vehicle body rail holding frames installed onthe left side and the right side of a vehicle body bogie, magnetic conductive rails installed on ground rails on the left side and the right side, a feedback control system, an air gap position detection controller, high-temperature superconducting electromagnets and guide electromagnets, wherein the high-temperature superconducting electromagnets and the guide electromagnets are installed on thevehicle body rail holding frames respectively. The traction power device comprises an iron-core-free long-stator permanent magnet synchronous linear motor which comprises two stators, two rotors and two installation supports. Each stator is vertically installed in the center of a ground track, and each rotor is vertically installed between the two sides of the two stators and installed on a bogieof a vehicle body. The problems of large coil volume and weight, serious heating and easy insulation aging in a traditional magnetic suspension structure are avoided, and the structure of a magnetic suspension system is simplified.

The invention discloses an electronic equipment assembly, a charging control method and a charging control device of electronic equipment. In the disclosed electronic equipment assembly, the foldableelectronic equipment has an unfolding state and a folding state; when the foldable electronic equipment is in an unfolded state, a third coil is in rechargeable fit with a first coil, and a fourth coil is in rechargeable fit with a second coil; when the foldable electronic equipment is in a folded state, the third coil and the fourth coil are both in rechargeable fit with one of the first coil andthe second coil; at least one of the foldable electronic equipment and a wireless charging device further comprises a temperature detection module. When the temperature of a first folding part is higher than a first preset temperature, the first coil or the third coil is in a power-off state; and under the condition that the temperature of a second folding part is greater than a second preset temperature, the second coil or the fourth coil is in a power-off state. According to the scheme, the problem that the electronic equipment generates heat seriously during wireless charging can be solved.

The invention discloses an electronic device assembly, a control method thereof and a control device of an electronic device. In the disclosed electronic device assembly, a wireless charging device comprises a first coil and a second coil, a third coil of a telescopic electronic device is arranged in a telescopic part, and the telescopic part can retract into a body part or at least partially extend out of the body part. When the telescopic electronic device is in a first state, the telescopic part retracts into the body part, and the third coil is in charging fit with the first coil, and whenthe telescopic electronic device is in a second state, at least part of the telescopic part extends out of the body part, and the third coil is in charging fit with a second coil. Under the conditionthat the temperature of the first coil is higher than a first preset temperature, the telescopic electronic device is in the second state; and under the condition that the temperature of the second coil is greater than a second preset temperature, the telescopic electronic device is in the first state. According to the above scheme, the problem that the electronic device generates more heat during wireless charging can be solved.

The invention relates to a rail pressure regulating valve, in particular to a rail pressure regulating valve for a common-rail system, and belongs to the field of fuel injection systems of internal combustion engines. The rail pressure regulating valve comprises a metering valve and a feedback valve, wherein the metering valve is mounted between the outlet of a low-pressure oil pump and the inlet of a high-pressure oil pump; the feedback valve is connected with a common-rail pipe through a high-pressure oil pipe; the metering valve and the feedback valve are linked through screw threads on a metering valve shell and a feedback valve shell; the upper end of a valve core of the metering valve and the lower end of a valve rod of the feedback valve are rigidly connected together through interference fit; and a disc-type armature of the metering valve and the valve rod of the feedback valve are linked through the screw threads or rigidly connected together through interference fit. The rail pressure regulating valve provided by the invention is served as a feedback rail pressure regulating valve, and has the characteristics that the transient response is quick, the energy loss is low, and the rail pressure control algorithm is greatly simplified.

The invention belongs to the field of three-level inverter circuits, and discloses a voltage balancing method and system for a direct-current side series capacitor of a three-level inverter circuit, and the method comprises the steps: obtaining the voltage of a first capacitor and the voltage of a second capacitor; when the difference between the voltage of the first capacitor and the voltage of the second capacitor is positive, switching off a switching tube directly connected with the second capacitor, calculating a first duty ratio according to the difference between the voltage of the first capacitor and the voltage of the second capacitor, and switching on the switching tube directly connected with the first capacitor according to the first duty ratio; when the difference between thevoltage of the first capacitor and the voltage of the second capacitor is negative, switching off the switching tube directly connected with the first capacitor; and calculating a second duty ratio according to the difference between the voltage of the second capacitor and the voltage of the first capacitor, and switching on a switching tube directly connected with the second capacitor according to the second duty ratio. The switching tube directly connected with the first capacitor and the switching tube directly connected with the second capacitor are independently controlled, so that the problems of relatively large current and serious heating of the balance circuit during light load are solved.

The invention discloses an anti-slip control method for a hybrid electric vehicle, the hybrid electric vehicle and a storage medium, and belongs to the field of vehicle control. The method comprises the following steps of S1, acquiring a whole vehicle signal; S2, if an anti-slip condition is met, turning to S3, and otherwise, ending; S3, if the rotating speed of a driving motor is larger than a first threshold value, starting the engine, and turning to S4; otherwise, stopping the engine, and turning to S4; S4, calculating PI adjusting torque; S5, calculating a feed-forward torque and a total output torque; S6, if the total output torque exceeds a locked-rotor torque range of the driving motor, turning to S7, and otherwise, turning to S8; S7, calculating the engine torque and the driving motor torque, and turning to S9; S8, defining the torque of the driving motor as the total output torque, and turning to step S9; S9, if the vehicle is stable, turning to S10, and otherwise, turning toS4; S10, if the stable duration of the vehicle exceeds the set time, turning to S11; and S11, resetting the PI calculator, and turning to S2. When the vehicle slides on a slope quickly, the driving motor and the engine are adopted to maintain the stability of the vehicle, and the reliability is high.

The invention relates to a dynamic permanent magnetic field driving type ultra-magnetostrictive actuator. The two parts of the machine body are symmetrically mounted together along the center, and the two parts of the machine body are connected and tightened through double end studs and nuts; the upper end plane of the machine body is in contact with the lower end plane of a flange on the inner side of an external bracket; a driving gear shaft is mounted on the lower part of the external bracket; a driving shaft deep groove ball bearing is mounted between the lower end of the driving gear shaft and the external bracket; a driving gear is mounted at the upper end of the driving gear shaft; a driving check ring is tightly screwed on the driving gear shaft for axially fixing the driving gear shaft; the driving gear is meshed with two driven gears; the two parts of the external bracket are symmetrically mounted together along the center; the double end studs are mounted in counterbore holes in the two sides of the external bracket; and the two parts of the external bracket are fastened through the nuts. According to the dynamic permanent magnetic field driving type ultra-magnetostrictive actuator, due to the combination of the permanent magnets and a mechanical rotary mechanism, an excitation mode for generating a dynamic alternating magnetic field by the movement of the permanent magnets is formed; and the shortcomings of high power, huge heating amount, large size and the like of the driving power supply adopting an electromagnetic coil excitation mode are avoided.

The invention discloses a cooking utensil and an electric heating device for the cooking utensil. The cooking utensil comprises a first inductor, an IGBT, a first resonance coil, a second resonance coil, a first capacitor, a second capacitor, a third capacitor, a switch component and a controller, wherein the first end of the first resonance coil is connected with the first inductor; the second end of the first resonance coil is connected with the first end of the second resonance coil; the second end of the second resonance coil is connected with the second end of the IGBT; the first end of the second capacitor is connected with the first end of the first resonance coil; the second end of the second capacitor is connected with the first end of the third capacitor; the second end of the third capacitor is connected with that of the second resonance coil; the first end of the switch component is connected with a first node between the first resonance coil and the second resonance coil; the second end of the switch component is connected with a second node between the second capacitor and the third capacitor; the controller is used for controlling the on / off of the IGBT and the switch component. Therefore, zero voltage crossing switching-on of the IGBT under high power and low power can be guaranteed to prevent the IGBT from being damaged.

The invention discloses an electromagnetic heating apparatus and a heat control circuit and a heat control method thereof. The heat control circuit comprises a voltage zero-crossing detection unit, a resonance heating unit, a rectifying and filtering unit, a power switch tube, a driving unit, a discharging unit and a main control unit, wherein the discharging unit is used for performing discharging treatment on the collector voltage of the power switch tube; one end of the discharging unit is connected with the collector of the power switch tube while the other end of the discharging unit is grounded; the main control unit is connected with the voltage zero-crossing detection unit, the driving unit and the control end of the discharging unit separately; and when the main control unit controls the electromagnetic heating apparatus to operate in a low-power interrupted heating way, the discharging unit is controlled to stop discharging in a heating section, and the discharging unit is controlled to perform discharging in the heating stop section so as to enable the voltage of the collector to be lowered to a preset value when the power switch tube is heated and switched on in the next time, so that the power switch tube is controlled to be switched on at quite low collector voltage in the interrupted heating process, so as to avoid hard switch-on of the power switch tube.

The invention discloses a motor disconnection detection method, which is applied to frame control or vehicle control and comprises the following steps: acquiring output voltage, output current and rotating speed of a converter; calculating a first flux linkage through a voltage model according to the output voltage and the output current; according to the output current and the rotating speed, calculating through a current model to obtain a second flux linkage; judging whether the first flux linkage is consistent with the second flux linkage or not; and if not, judging that motor disconnectionoccurs. The detection method can effectively detect whether motor disconnection occurs or not, improves the reliability of motor disconnection detection, avoids the severe heating condition of the motor, and prolongs the service life of the motor. The invention also discloses a motor disconnection detection system and device, and a computer readable storage medium, which all have the above beneficial effects.

The invention provides a radial magnetizing vacuum cleaning motor, and belongs to the technical field of vacuum cleaning motor. A first motor rotor yoke and a second motor rotor yoke form a set, the outer side of the first motor rotor yoke and the outer side of the second motor rotor yoke are each provided with a rotor body retainer ring, and a rotor spacer ring is arranged between adjacent two rotor body retainer rings of the two sets of the motor rotor yokes. A rotor shaft snap spring is arranged on the rear portion of a rotor shaft of the motor, motor rotor yoke positioning pins are arranged on the third motor rotor yoke, the fourth motor rotor yoke, the first motor rotor yoke and the second motor rotor yoke, and rotor permanent magnet embedding ports are formed in the third motor rotor yoke, the fourth motor rotor yoke, the first motor rotor yoke and the second motor rotor yoke. Rotor permanent magnets are embedded in the rotor permanent magnet embedding ports. A bearing spring pad is arranged between a ceramic deep groove ball bearing at the rear end of the motor rotor shaft and a rear end cap of the motor, stator punching sheets are arranged between the motor rotor yokes and a motor casing, and stator punching sheet rivets are arranged on the stator punching sheets. The radial magnetizing vacuum cleaning motor is especially applicable to the aerospace field.

The invention provides an overcurrent and overtemperature protection circuit and an MPPT chip. The overcurrent and overtemperature protection circuit comprises a sampling current source, a multistagecurrent comparison circuit, a temperature and current source, a multistage temperature comparison circuit and a control circuit, wherein an output end of the sampling current source is connected withan input end of the multistage current comparison circuit; the output end of the temperature and current source is connected with the input end of the multistage temperature comparison circuit; the output end of the multistage current comparison circuit is connected with a first input end of the control circuit; and the output end of the multistage temperature comparison circuit is connected witha second input end of the control circuit. According to the overcurrent and overtemperature protection circuit, control on the working state of the MPPT chip through temperature and breakover currentin common is achieved, that is to say, the MPPT chip can be controlled to stop working when the temperature and the breakover circuit are relatively high, and the phenomenon of serious heating of theMPPT chip is avoided, thereby improving the security and the reliability of the MPPT chip.

The invention discloses a design method and circuit for suppressing diode rectification voltage peaks. The method comprises the steps of enabling the voltage peak energy to be recovered through an active feedback effect by means of a voltage suppression circuit, transferring the transient voltage peak energy of the diode to a voltage platform period after the peak, and adaptively adjusting a clamping voltage according to an output voltage. Diode transient voltage peak energy is transferred to a post-peak voltage platform period; the output voltage range of the whole power converter is realized; the clamping voltage can be adaptively adjusted along with the output voltage, and the voltage peak energy is recovered through the active feedback effect in the voltage clamping process, thereby avoiding the severe heating of a part of elements of a conventional energy consumption type absorption circuit, improving the overall conversion efficiency, and enabling the advantages of a high-power capacity converter to be more obvious.

The invention relates to a charging protection method, a charging protection device, and a mobile terminal, which relate to the technical field of mobile terminals. The charging protection method comprises the steps of detecting whether a charging current exists or not; when detecting the existence of the charging current, avoiding carrying out an operation instruction of a user, and controlling a screen to be at a lock screen state or controlling the screen to display a charging icon only. Through the technical scheme provided by the invention, the user operation is limited when the mobile terminal is at a charging state, so that the user can be helped to form a favorable charging habit, the unsafe act of charging while operating the mobile terminal is reduced, and the mobile terminal can be effectively prevented from heating severely.

The invention is applicable to the technical field of wireless charging, and provides a wireless charger, comprising a negative pressure generator, a wireless charging module arranged above the negative pressure generator, a suction cup arranged above the wireless charging module, and a hollow shaft. One end of the hollow shaft is communicated with the suction disk after passing through the wireless charging module, and the other end of the hollow shaft is communicated with the negative pressure generator, which can generate negative pressure to make the suction disk adsorb the adsorbed object. The wireless charger of the invention adopts a negative pressure generator and a suction cup to adsorb the adsorbed object for wireless charging, or only acts as a support, which is more convenientand time-saving than the mechanical clamping of the absorbed object, and avoids the serious problem of heat generation caused by the increase of eddy current loss and greatly increases the market competitiveness of the product compared with the magnetic adsorption of the absorbed object.

The invention discloses a motorized spindle. A core shaft, a rotor fixed to the core shaft, a stator, two rear end bearings arranged at the rear portion of the core shaft, rear end bearing blocks sleeving the rear end bearings, a front end bearing arranged at the front portion of the core shaft and a front end bearing block sleeving the front end bearing are included. The part, between the two rear end bearings, of the core shaft is sleeved with a cooling cavity. The two opposite side walls of the cooling cavity are provided with a first liquid inlet channel and a first liquid discharging channel correspondingly. The parts, between the motorized spindle stator and the rear end bearings, of the core shaft are each sleeved with a heat isolation cavity, and the two opposite side walls of theheat isolation cavity are provided with a second liquid inlet channel and a second liquid discharging channel correspondingly. The front end bearing blocks are sleeved with copper insert bearings, thecopper insert bearings are each sleeved with a front end cover, the bearing blocks and the copper insert bearings are in interference fit, the copper insert bearings and the front end cover are in interference fit, and the front end cover is fastened to the front end face of the stator. The device is simple in structure and good in stability and heat dissipation performance.

The invention discloses a multifunctional portal magnetic drilling machine which comprises a device main body, wherein a magnet seat is arranged on the outer surface of the lower end of the device main body; a cooling oil tank is arranged on one side of the outer surface of the front end of the device main body; a fixed plate is arranged on the outer surface of one side of the device main body; adrive motor is arranged on one side of the fixed plate; a telescopic knife cylinder is arranged at the lower end of the drive motor; a hole drill is arranged at the lower end of the telescopic knife cylinder; a sliding chute is formed in the outer surface of the inner side of the fixed plate; a sliding shaft is arranged on the outer surface of the inner side of the sliding chute; and a sliding block is arranged at one end of the sliding shaft. The multifunctional portal magnetic drilling machine utilizes a movable handle to be convenient to carry and suitable for field work, can conveniently adjust the drilling depth, is better in working effect and can prevent the drilling machine from generating excessive heat. The driving record can bring about a better using prospect.

A grease lubrication two-way thrust conical sliding bearing comprises a bearing inner ring and a bearing outer ring which are assembled in a matched mode. The bearing outer ring and the bearing inner ring are in friction contact to form two friction conical surfaces with different inclination directions, and solid super-lubrication coatings are arranged on the friction conical surfaces. A grease storage cavity which extends in the circumferential direction and is used for storing lubricating grease is formed in the bearing outer ring or the bearing inner ring, and two sets of grease storage cavity grease supply holes are formed between the grease storage cavity and the two friction conical surfaces respectively to supply lubricating grease to the two friction conical surfaces respectively. An outer ring lubricating grease guide groove is formed in the inner wall of the bearing outer ring, and an inner ring lubricating grease guide groove is formed in the outer wall of the bearing inner ring. According to the bearing, a grease lubrication technology and a solid super-lubrication coating technology are combined to approach a theoretical super-lubrication state, the performance of the bearing is greatly improved, the service life of the bearing is greatly prolonged, and it is made possible to replace a rolling bearing with the sliding bearing.

The embodiment of the invention discloses an equipment control method and device and electronic equipment. The method comprises the following steps: acquiring current load data of target equipment and temperature data of a specified device; obtaining a temperature change trend of the target equipment based on the load data; and based on the temperature data of the specified device and the temperature change trend, operating parameters of the target device are adjusted, and the operating parameters represent the hardware resource use condition of the target device. Through the mode, the temperature change trend of the target equipment can be obtained by obtaining the current load data of the target equipment, so that the heating condition of the target equipment can be estimated based on the temperature data of the specified device and the temperature change trend; therefore, the operation parameters of the target equipment can be adjusted in advance based on the pre-estimation result, the target equipment is prevented from generating huge heat, and the user experience is improved.

The invention relates to the technical field of vacuum pumps, in particular to an electric vacuum pump and a brake assisting system. The electric vacuum pump comprises a pump body, wherein a pump bodyoutlet is formed in the pump body, a drainage pipeline is connected to the pump body outlet and is provided with a pipeline outlet, the pipeline outlet faces the pump body, and a guide cover structure for increasing a spraying area of the pipeline outlet is arranged at the pipeline outlet. By means of the electric vacuum pump, the overflow rate of heat accumulated in the electric vacuum pump is accelerated, a condition that the electric vacuum pump generates heat severely and is too high in temperature as heat is accumulated is avoided, stable operation of the electric vacuum pump is guaranteed and the service life is prolonged.

The invention relates to an energy-saving type hydraulic pressure-shear testing machine. The energy-saving type hydraulic pressure-shear testing machine comprises a vertical load mechanism and a horizontal load mechanism, the horizontal load mechanism comprises a shear plate and a horizontal force load cylinder outputting a horizontalforceto the shear plate, the vertical loading mechanism comprises a lower press plate matched with the shear plate in use and a vertical force load cylinder outputting a vertical force to the lower press plate, the pressure and shear testing machine with dual hydraulic power further comprises an oil supply system supplying oil for the horizontal force load cylinder and the vertical force load cylinder, the oil supply system comprises an oil tank, a horizontalforce load cylinder oil supply channel and a vertical force load cylinder oil supply channel, and the horizontal force load cylinder oil supply channel and the vertical force load cylinder oil supplychannel are provided with overflow valves, and both comprise hydraulic pumps and flow regulating valves arranged on the upper stream of the hydraulic pumps.The invention provides the energy-saving type hydraulic pressure-shear testing machine capable of lowering oil energy loss.

The invention discloses a motor with a stator rapid heat dissipation function, comprising a casing, a stator assembly, a front end cover, a rear end cover, a main shaft and a rotor, a stator assembly is arranged on the inner wall of the casing, and the front end cover and the rear end cover are respectively connected to two ends of the casing The shell is closed, the main shaft is installed on the front end cover and the rear end cover through the double-end support of the bearing, the main shaft extends out of the front end cover as the output shaft of the motor, the rotor is installed on the main shaft, the rotor and the stator assembly are arranged radially face to face, and the stator assembly and the casing are arranged face to face. There is circulating cooling fluid between them. The invention quickly transfers the heat in the stator to the outer surface for heat dissipation through the magnetic fluid, and helps the stator to cool down quickly. Compared with the traditional heat dissipation structure, the thermal stability of the stator is better, and the flow of the magnetic fluid relies on electromagnetic drive. No external mechanical power is required, and the closed loop requires little maintenance.

The invention provides a heat-dissipation anti-loosening cable joint, belongs to the technical field of cable joints, and aims to solve the technical problems that the joint of an existing cable joint is insufficient in strength, is easy to loosen and easy to heat. The heat-dissipation anti-loosening cable joint comprises a heat dissipation connector and an insertion connector, the heat dissipation connector is provided with a male head, a miniature diaphragm pump, a heat dissipation protection cover and a miniature fan, and heat dissipation fins are fixed to the outer side of the male head; a capillary heat dissipation pipeline is arranged between the heat dissipation connector and the heat dissipation protection cover, and the insertion connector is provided with a female head, a threaded ring, a pressing sleeve, a spring plate and a spring. Conical sleeves are arranged in the heat dissipation connector and the insertion connector, cables and fixed circular truncated cones are fixed to the male connector and the female connector, and guide locking sleeves are arranged on the fixed circular truncated cones. According to the invention, heat can be quickly dissipated through the cooling fins and circularly flowing cooling liquid, and serious heating is prevented; the female head is clamped in the male head, the spring plate tightly abuts against the pressing sleeve, and a positioning boss is clamped at the end part of a guide positioning groove, so that the connection is stable, loosening is prevented, and the connection strength is improved.

The invention discloses a cooling utensil and an electric heating device for the cooking utensil. The electric heating device comprises a first inductor with the first end connected with a power supply, an IGBT with the first end grounded, a resonance coil with the first end connected with the second end of the first inductor and the second end connected with the second end of the IGBT, a first capacitor with the first end connected with the first end of the resonance coil and the second end grounded, a second capacity with the first end connected with the first end of the resonance coil and the second end connected with the first end of a third capacitor, the third capacitor with the second end connected with the second end of the resonance coil, a switch assembly with the first end connected with a first joint between the second capacitor and the third capacitor and the second end grounded, and a controller for controlling the connection or disconnection of the IGBT and the switch assembly. Thus, by switching the resonance mode of the electric heating device, the voltage zero-pass opening of the IGBT can be ensured under large power and continuous low power, and the IGBT is prevented from damage.

The invention provides testing equipment for a wireless charging receiver, which is reliable and stable, high in energy efficiency, low in error rate, small in heating value and simple in debugging, and a testing method of the equipment. The testing equipment comprises a wireless charging receiving end (1), a power supply (2), a micro-processing controller (3), a signal generator (4), a power amplifier (5) and an ASK signal sampling and processing module (6); the micro-processing controller (3), the signal generator (4) and the power amplifier (5) are sequentially connected, and the power amplifier (5) is directly coupled with the wireless charging receiving end (1); the testing method comprises the steps of signal modulation, power amplification, PWM signal output, direct coupling and inputting to the wireless charging receiving end, establishment of a communication between a charging device and the wireless charging receiver, setting of current and voltage values by the ASK signal sampling and processing module (6) and obtaining electric parameter information of the wireless charger. The testing equipment and method in the invention can be applied to the field of testing.