32results about How to "Won't oscillate" patented technology

The invention discloses a power battery thermal management system based on the combination of a microchannel heat pipe and a phase change material. The power battery thermal management system comprises multiple battery cells, a microchannel heat pipe, a box with through holes, a box cover, fins welded to the side walls of the box and clamping plates. The microchannel heat pipe comprises multiple evaporation ends and condensation ends. The evaporation ends and the battery cells are arranged at intervals. The evaporation ends are connected in parallel and form a loop with the condensation ends.The battery cells are separated from the evaporation ends through the clamping plates. The gap between the two clamping plates is filled with a phase-change material. The condensation ends stretch outof the box through the through holes and are installed on the fins. The power battery thermal management system has the advantages of large heat dissipation amount, high heat dissipation efficiency,fast heat dissipation rate, low cost, high safety, energy saving, environmental friendliness and simple structure.

The invention discloses a power module heat management device based on self-adaptive adjustment of a driving circuit. The power module heat management device based on the self-adaptive adjustment of the driving circuit comprises a DSP analog voltage output circuit arranged between the driving circuit and an IGBT grid, and an IGBT grid charging and discharging control loop, wherein the IGBT grid charging and discharging control loop is used for providing a charging and discharging loop for a stray capacitor of the IGBT grid, and the DSP analog voltage output circuit is used for generating the control voltage of the IGBT grid charging and discharging control loop. According to the power module heat management device based on the self-adaptive adjustment of the driving circuit, the base current of the IGBT grid charging and discharging control loop is adjusted by adjusting the output analog voltage of the DSP analog voltage output circuit, then the collector current of a triode is adjusted, and namely, the grid peak current of an IGBT is adjusted. According to the power module heat management device, the circuit is simple, and the problems of circuit impact and time delay which are caused by driving voltage switching are solved; an extra driving circuit is not needed by adjusting the given voltage of the triode in a control circuit.

The invention relates to a pneumatic artificial muscle contraction device for soft landing of airborne equipment, which belongs to the technical field of spaceflight. The pneumatic artificial muscle contraction device comprises pneumatic artificial muscle, a height sensor, a controller and a gas generator, wherein the pneumatic artificial muscle is connected with the gas generator through gas circuits; and the gas generator and the height sensor are respectively connected with the controller through circuits. The pneumatic artificial muscle contraction device adopts the pneumatic artificial muscle as a pneumatic executive element, and as the weight of the device is light, and the flexibility and the self damping property of the device are good, the device can effectively reduce the shock to the airborne equipment when the airborne equipment is landed by absorbing energy within a short time, therefore, the airborne equipment cannot be shocked and is not easy to be affected by external climate conditions.

The invention discloses a low-cost separated component dimming circuit of an LED light source. The low-cost separated component dimming circuit of the LED light source is composed of a rectifying circuit, a weak leakage circuit, a voltage sampling circuit, a strong leakage circuit, a first filter circuit, a constant current circuit and a second filter circuit. The input end of the rectifying circuit is connected with a power source, and the output end of the rectifying circuit is connected with the input end of the weak leakage circuit. The output end of the weak leakage circuit is connected with the input end of the strong leakage circuit through the voltage sampling circuit, and the output end of the strong leakage circuit is connected with the input end of the constant current circuit and the input end of the second filter circuit through the first filter circuit. The output end of the constant current circuit is also connected with the input end of the second filter circuit, and the output end of the second filter circuit is connected to the LED light source. According to the low-cost separated component dimming circuit of the LED light source, simple separated components are used for achieving dimming compatible with controlled silicon, the unique leakage circuits are combined with the simple constant current circuit to achieve the purpose of being compatible with a dimmer, and the cost of the dimming circuit is lowered by 200%.

This invention relates to data communication and discloses a message transmission system and a method based on TCP to protect starting the quick re-transmission when loosing packets or missing packets under the state of exchanging data flows in the data message transmission based on TCP so as to reduce bad influence to the TCP flow and time delay to ensure the TCP data flow to keep at a high level and avoid continuous vibration, which connects two sockets into a communication channel, each socket connection is responsible for loading data transmission at one direction and its responded ACK message only, namely, the data messages and ACK messages in a same direction are transmitted by different socket channels.

The invention discloses a dynamic regulation method for the power of a high-voltage electrode boiler. In order to ensure that the high-voltage electrode boiler can quickly reach the load power when the device is put to use for initial commissioning, a servo motor can quickly open a protection shield according to the set power requirement, so that a high-voltage electrode can work at a set power. Circulating water flow of a bypass is adjusted through a three-way valve, and the bypass of a circulating water pipeline is completely opened in the initial stage. As the temperature of the circulatingwater gradually rises, the conductivity is increased. When the power of the boiler gets greater, the temperature is rapidly increased along with the temperature, and therefore the purpose of fast heating is achieved. According to the method, a slope function stepped means is adopted for adjusting the power value, and the bypass opening degree value is adjusted by combining a three-way valve stepped manner. The power value can be quickly adjusted, a peak adjusting command is responded, the power adjusting speed is high, and system vibration cannot be caused.

The invention discloses a control method and device for short-circuit protection of a bridge converter. The output voltage of the bridge converter is detected; when the output of the bridge converteris detected to have a short circuit, firstly the drive of an energy transfer switch tube is controlled to be turned off, and then the drive of a freewheeling switch tube is controlled to be turned offafter the time delay [delta]t. A detection unit is used for detecting the output voltage of the bridge converter and is used for primary side bus current overcurrent protection. A control unit is used for controlling the on-off of the drive of all switch tubes in the bridge converter. By adopting a selective switch tube drive wave sealing strategy, the drive of the freewheeling switch tube is wave sealed when an output short circuit occurs, so that only a resonant inductor and a resonant capacitor oscillate in the resonant cavity, the oscillation with a parasitic capacitor in the switch tubebody is avoided, and the drive of the freewheeling switch tube is turned off when the energy in the resonant cavity is exhausted. According to the invention, the voltage stress of the switch tube during the output short circuit state and the primary side overcurrent protection of the bridge converter is reduced, and the reliability of the system is improved.

The invention discloses an optimal noise coefficient testing method. The method comprises steps as follows: a test structure I, a test structure II, a test structure III, a de-embedding structure and a direct-connection structure are manufactured on a silicon slice; a 50-ohm system is used for testing a first noise coefficient of the test structure I and a second noise coefficient of the test structure II at different frequencies; the test structure III, the de-embedding structure and the direct-connection structure are tested to obtain a first scattering parameter, a de-embedding scattering parameter and a direct-connection scattering parameter; the first noise coefficient, the second noise coefficient and the first scattering parameter are de-embedded to obtain a third noise coefficient, a fourth noise coefficient and a second scattering coefficient respectively; a fifth noise coefficient is derived; first equivalent noise resistance and second equivalent noise resistance are derived; first optimal source admittance and second optimal source admittance are derived; optimal source conductivity is derived; an optimal noise coefficient is derived. According to the optimal noise coefficient testing method, the 50-ohm system is used for testing, the optimal noise coefficient of a device is derived, the defects that a few of test resources are available and equipment is expensive can be overcome, and the device cannot oscillate.

The present invention belongs to the field of the electronic technology, and specifically relates to an anti-ringing circuit. A synchronization rectifier tube grid discharging circuit is employed, after a circuit is zero crossing, the synchronization rectifier tube is not closed immediately, and the synchronization rectifier tube grid rapidly discharges to a low potential to perform weak conduction, when the voltages at two ends of the inductor is equal, the synchronization rectifier tube is thoroughly turned off, and the circuit is located at a stable state, the voltage of a SW is equal to the output voltage without oscillation, therefore the anti-ringing effect is reached.

The invention discloses a structure and method for measuring the precision of a high-speed comparator based on a TDC chip. The structure comprises a signal generation module, a control module and a TDC chip module, wherein one input end of the high-speed comparator receives direct-current threshold voltage, the other input end of the high-speed comparator receives a group of periodic signals output by the signal generation module, and the TDC chip module comprises an input unit, a plurality of first measurement channels, a plurality of second measurement channels, a processing unit and an output unit; and the delay error calculation unit is used for calculating delay errors of input and output signals of the high-speed comparator in each period of the internal reference clocks and / or calculating period errors of the high-speed comparator in two adjacent internal reference clock periods, and outputting test results of the delay errors and the period errors of the high-speed comparator.

The invention discloses a vibration separating device used for sticky candies. The vibration separating device comprises a rack, a separating mechanism and a vibrating mechanism. The separating mechanism comprises a screening trough. The middle of the screening trough is hinged to the rack. A first screening net used for separating the sticky candies out, second screening nets used for separating sesame out and a powder collector are sequentially arranged in the screening trough from top to bottom. The second screening nets are both slantly arranged, and a discharging opening is formed in the portion, located at the low ends of the second screening nets, of the screening trough. The powder collector is in a funnel shape. The vibrating mechanism comprises a cam mechanism and an elastic piece. The elastic piece is arranged at one end of the screening trough. A driven piece of the cam mechanism is hinged to the other end of the screening trough. By means of the technical scheme, the aim of separating out the infirmly-stuck sesame and the infirmly-stuck powder before the sticky candies are packaged is achieved.

This invention relates to a crystal acceleration oscillation circuit including a quartz oscillation crystal generating an oscillation single, an amplifier set, a feedback circuit, a first and a second trigger and an amplifier logic switch. The amplifier set amplifies the oscillation signal, the feedback resistor is for setting up DC working bias of said amplifier set, the input end of the first trigger is connected with the output end of said amplifier set, so the at, the amplifier signal triggers said first trigger to generate a first clock output, the input end of the second trigger is connected with the output end of said amplifier set, so its oscillation signal triggers a second trigger to generate a second clock output which has a retarding voltage greater than a preset value, the amplifier switch is connected with the second trigger to reduce intensity.

The invention discloses a level flight transition section guidance control method. The method includes the following steps of S1, online planning a trajectory, wherein the change trajectory of a missile is planned according to a certain rule after conditions for entering a transition section are met with the current skyward acceleration aH, skyward velocity VH and altitude H as initial states andthe preset level flight altitude HT and the tail end skyward velocity VH(tend) and the acceleration aH(tend) of the transition section as constraints; S2, pre-correcting guidance, wherein required overloads are calculated according to the difference value of the current skyward velocity VH and altitude H of a loitering munition and the preset level flight altitude HT, the missile is controlled togenerate corresponding overloads, and it is ensured that the missile stably enters the transition section; and S3, guiding the transition section, wherein after conditions for entering the transitionsection are met, a standard altitude and skyward speed trajectory generation instruction of the transition section is generated according to the planned trajectory, and trajectory tracking is realizedthrough altitude and speed control until the missile shifts to the level flight section. By means of the method, by online planning an altitude channel of the missile and tracking the missile in realtime, it is ensured that the loitering munition stably shifts from the transition section to the level flight section.

The invention discloses a visual ultrasound scalpel for hepatobiliary surgery and a remote ultrasound surgical system. The visual ultrasound scalpel for hepatobiliary surgery comprises a knife tube and a handle. The handle comprises a body and a grip. The knife tube is inserted in the front end of the device body. The visual ultrasound scalpel for hepatobiliary surgery also includes an ultrasonictransducer, a horn, a first connector, a lens tube holder, a first shock absorbing mechanism and a second shock absorbing mechanism, arranged in the device body, and a endoscope tube arranged in the knife tube and the body. The ultrasonic transducer is connected with an amplitude horn, wherein the amplitude horn is fixedly connected with a knife tube through a first connecting piece; the endoscopetube is arranged in the knife tube and is not in contact with the inn wall of the knife tube, and the rear end is fixed on the lens tube holder, and the endoscope tube is used for collecting opticalimages; the first shock absorbing mechanism is fixed on the speculum tube for reducing vibration transmitted from the knife tube to the speculum tube; and the second shock absorbing mechanism is fixedon the lens tube holder for reducing vibration transmitted from the body to the lens tube holder. The invention can realize the visualization function of the ultrasonic knife and the remote visualization function of the ultrasonic operation system.

The invention provides a method for forming an IGBT electric field stop layer, and relates to the technical field of IGBT processes. The method for forming the IGBT electric field stop layer comprises the following steps: S1, preparing a substrate; s2, growing a gate oxide layer; s3, polycrystal deposition and photoetching are carried out; s4, injecting a P-type body region; s5, propelling a P-type body region; s6, performing N + injection and propulsion; s7, depositing a dielectric layer; s8, performing contact hole photoetching and metal sputtering; s9, injecting a P-type collector region on the back surface; s10, annealing a collector region on the back surface; s11, high-energy protons are injected into the back surface for many times; s12, performing high-energy proton injection annealing; and S13, back collector electrode metal sputtering is carried out. According to the method, high-energy proton injection is carried out for many times, then annealing is carried out at the temperature of 350-450 DEG C and under the N2 condition, N-type impurity distribution with the thickness of 20-50 microns is formed on the back face of the IGBT, and therefore the function of an electric field stop layer is achieved, due to the fact that the number of electrons in the thick electric field stop layer is large, the current cannot suddenly drop to zero when the IGBT is turned off, and oscillation of the IGBT cannot be caused.

The invention discloses a vacuum drying device for powder metallurgy. The vacuum drying device comprises a cylinder and further comprises a top cover, wherein the top cover is used for condensing steam as well as draining and exhausting steam condensate; the cylinder and the top cover are connected in a sealing manner so as to form a closed cavity; the top cover comprises a top cover inner wall, atop cover outer wall and a cooling medium circulation channel; the cooling medium circulation channel is positioned on an interlayer between the top cover inner wall and the top cover outer wall; thetop cover inner wall takes the shape of a cone or a sphere of which the middle protrudes upward; a cooling medium inlet and a cooling medium outlet are formed on the top cover outer wall and both communicate with the cooling medium circulation channel; a condensate collecting tank used for collecting the steam condensate is arranged below the edge of the top cover inner wall; a pipeline used forexhausting the steam condensate in the condensate collecting tank is connected onto the condensate collecting tank; and a recycling barrel is connected with the output end of the pipeline. The vacuumdrying device disclosed by the invention has the advantages that the drying efficiency is high, the liquid residue is low, the rapid batched drying process can be achieved, and the purity and the quality of powder obtained from the drying process are high.

The invention discloses a power adaptive adjustment method of HT-PEM methanol-water fuel cell, which belongs to the field of fuel cell technology. The main controller detects the stack output power Po and the load output power P1 in real time, and outputs the detected stack output power. The power Po is compared with the load output power P1. When the stack output power Po is equal to the load output power P1, the main controller does not process; when the stack output power Po does not match the load output power P1, the main controller passes the coarse adjustment The combination of the control outer loop and the fine-tuning control inner loop makes the stack output power Po match the load output power P1. The invention has good load dynamic response capability, self-adaptive adjustment, fast control response speed, basically no delay, smooth control process, no system vibration, and high stability.

The invention discloses a planar gate IGBT and a manufacturing method therefor, and belongs to the technical field of a power semiconductor device. A floating p type region is introduced to a part of region on the surface of a JFET region of the device on the basis of the conventional planar gate IGBT device structure, wherein the floating p type region and a gate electrode are distributed at intervals in a direction perpendicular to the length direction of an MOS channel; when the device is in forward conduction, the JFET region below the floating p type region has the same carrier concentration distribution as the JFET region below the gate electrode due to the transverse carrier diffusion from the gate electrode to the direction of the floating p type region in the JFET region in the direction perpendicular to the length direction of the MOS channel. According to the planar gate IGBT, the gate electrode capacitance, particularly the gate electrode-collector electrode capacitance, of the device is lowered without affecting the forward conduction characteristic of the device, so that the switching speed of the device is improved and the switching loss of the device is lowered; and meanwhile, the degradation of the blocking characteristic of the device is avoided.

The invention discloses an optimal noise coefficient testing method. The method comprises steps as follows: a test structure I, a test structure II, a test structure III, a de-embedding structure and a direct-connection structure are manufactured on a silicon slice; a 50-ohm system is used for testing a first noise coefficient of the test structure I and a second noise coefficient of the test structure II at different frequencies; the test structure III, the de-embedding structure and the direct-connection structure are tested to obtain a first scattering parameter, a de-embedding scattering parameter and a direct-connection scattering parameter; the first noise coefficient, the second noise coefficient and the first scattering parameter are de-embedded to obtain a third noise coefficient, a fourth noise coefficient and a second scattering coefficient respectively; a fifth noise coefficient is derived; first equivalent noise resistance and second equivalent noise resistance are derived; first optimal source admittance and second optimal source admittance are derived; optimal source conductivity is derived; an optimal noise coefficient is derived. According to the optimal noise coefficient testing method, the 50-ohm system is used for testing, the optimal noise coefficient of a device is derived, the defects that a few of test resources are available and equipment is expensive can be overcome, and the device cannot oscillate.

The invention discloses a power module heat management device based on self-adaptive adjustment of a driving circuit. The power module heat management device based on the self-adaptive adjustment of the driving circuit comprises a DSP analog voltage output circuit arranged between the driving circuit and an IGBT grid, and an IGBT grid charging and discharging control loop, wherein the IGBT grid charging and discharging control loop is used for providing a charging and discharging loop for a stray capacitor of the IGBT grid, and the DSP analog voltage output circuit is used for generating the control voltage of the IGBT grid charging and discharging control loop. According to the power module heat management device based on the self-adaptive adjustment of the driving circuit, the base current of the IGBT grid charging and discharging control loop is adjusted by adjusting the output analog voltage of the DSP analog voltage output circuit, then the collector current of a triode is adjusted, and namely, the grid peak current of an IGBT is adjusted. According to the power module heat management device, the circuit is simple, and the problems of circuit impact and time delay which are caused by driving voltage switching are solved; an extra driving circuit is not needed by adjusting the given voltage of the triode in a control circuit.

The invention relates to a UUV virtual speed control method based on a bio-inspired model, belongs to UUV speed control methods, and aims at solving the problem that control for the UUV speed is instable. The method comprises that a virtual speed is obtained; a present position error is input to the bio-inspired model and smooth continuous processing is carried out to obtain a new position error, the virtual speed is processed according to the new position error, and a smooth continuous virtual speed is obtained; the virtual speed and an ocean current speed are subtracted from a present practical navigational speed of the UUV to obtain a speed error, the speed error serves as input of a PID speed controller, the PID speed controller acts output on a UUV model, a practical position of the UUV in the next step is obtained, and the UUV is controlled according to the obtained practical position; and the practical position of the UUV is compared with an expected position output by UUV motion plan, and an obtained position error item serves as position error input of the bio-inspired model in the next step. The method of the invention is used to control the navigational speed of the UUV when the UUV navigates near the water surface or in a shallow sea area.

The invention discloses a dynamic regulation method for the power of a high-voltage electrode boiler. In order to ensure that the high-voltage electrode boiler can quickly reach the load power when the device is put to use for initial commissioning, a servo motor can quickly open a protection shield according to the set power requirement, so that a high-voltage electrode can work at a set power. Circulating water flow of a bypass is adjusted through a three-way valve, and the bypass of a circulating water pipeline is completely opened in the initial stage. As the temperature of the circulatingwater gradually rises, the conductivity is increased. When the power of the boiler gets greater, the temperature is rapidly increased along with the temperature, and therefore the purpose of fast heating is achieved. According to the method, a slope function stepped means is adopted for adjusting the power value, and the bypass opening degree value is adjusted by combining a three-way valve stepped manner. The power value can be quickly adjusted, a peak adjusting command is responded, the power adjusting speed is high, and system vibration cannot be caused.

A quasi-synchronous reluctance machine defined by a stator having a core comprising an assembly of non-magnetically coupled or weakly coupled sectors of ferromagnetic material having in its A number of longitudinal teeth are arranged on the end face facing the rotor and slots are formed to accommodate the windings. The quasi-synchronous reluctance machine has said rotor as an integral part, the rotor also comprising a sheet core of ferromagnetic material formed with longitudinal teeth uniformly arranged on its end face facing the stator, said teeth having a number different from The number of teeth of the stator.

The invention belongs to the field of electronic technology, and in particular relates to an anti-ringing circuit. The present invention mainly uses a synchronous rectifier gate discharge circuit, the circuit does not immediately turn off the synchronous rectifier after zero crossing, but quickly discharges the synchronous rectifier grid to a very low potential to make its weak conduction When the voltage at both ends of the inductor is equal, the synchronous rectifier is completely turned off. At this time, the circuit is in a steady state, and SW will be stable and equal to the output voltage without oscillation, thus achieving the effect of anti-ringing.

The invention relates to a high-reliability power supply method for an electric locomotive, comprising the following steps: S1, a detection unit judges the running position and direction of the train relative to the catenary, and S2, the train travels from the power supply arm of the catenary to the neutral zone During the process, the converter of the power supply unit modulates the amplitude and shifts the phase, so that the neutral zone generates a voltage with the same phase and amplitude as the power supply arm, the train enters the neutral zone, and S3 travels from the neutral zone to the second power supply arm During the process, the converter amplitude and phase shift, so that the neutral zone generates a voltage with the same phase and amplitude as the second power supply arm, and the train enters the second power supply arm area; the power supply system provided by the present invention, by changing the neutral section The output voltage of the rectifier makes the neutral area and the power supply arm generate voltages with the same phase and amplitude, so that when the electric locomotive passes through the electric split phase area, it will drive by inertia with full load when the power is off, eliminating the power supply dead zone of the locomotive and improving safety and reliability.

The invention relates to the technical field of the ship engineering, in particular to a movable pile type positioning device of an engineering ship, which is characterized in that: the top part and the lower part of a positioning pile or a shifting pile are respectively provided with an upper pulley block and a lower pulley block, one end of a steel cable connecting the upper pulley block and the lower pulley block in a winding way is connected with a winch support, the other end of the steel cable is connected with a winch drum; one side of a steel column slide component with the shifting pile is provided with a hydraulic cylinder, pin holes at both ends of the hydraulic cylinder are respectively connected with pin shafts arranged on a hull deck and the winch support, a hinge shaft is arranged in the steel column slide component, and the shifting pile can rotate and tilt around the hinge shaft along with the flexion of the hydraulic cylinder. At least two steel column slide components are used, and at least one steel column slide component is provided with the shifting pile. The invention has the beneficial effects that: the positioning pile and the shifting pile are alternately plugged and pulled, the positioning is convenient and accurate, the shifting is rapid and arbitrary, the resistance of the engineering ship against the interference of outside wind and waves is high, no oscillation or swinging can occur in the positioning point, the safety is strong, and the reliability is high.

The invention discloses a visual ultrasound scalpel for hepatobiliary surgery and a remote ultrasound surgical system. The visual ultrasound scalpel for hepatobiliary surgery comprises a knife tube and a handle. The handle comprises a body and a grip. The knife tube is inserted in the front end of the device body. The visual ultrasound scalpel for hepatobiliary surgery also includes an ultrasonictransducer, a horn, a first connector, a lens tube holder, a first shock absorbing mechanism and a second shock absorbing mechanism, arranged in the device body, and a endoscope tube arranged in the knife tube and the body. The ultrasonic transducer is connected with an amplitude horn, wherein the amplitude horn is fixedly connected with a knife tube through a first connecting piece; the endoscopetube is arranged in the knife tube and is not in contact with the inn wall of the knife tube, and the rear end is fixed on the lens tube holder, and the endoscope tube is used for collecting opticalimages; the first shock absorbing mechanism is fixed on the speculum tube for reducing vibration transmitted from the knife tube to the speculum tube; and the second shock absorbing mechanism is fixedon the lens tube holder for reducing vibration transmitted from the body to the lens tube holder. The invention can realize the visualization function of the ultrasonic knife and the remote visualization function of the ultrasonic operation system.