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

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.

A planar gate IGBT and a manufacturing method thereof belong to the technical field of power semiconductor devices. Based on the traditional planar gate IGBT device structure, the present invention introduces a floating p-type region in a part of the surface of the JFET region of the device, and the floating p-type region and the gate electrode form an interval distribution perpendicular to the length of the MOS channel. When the device is forward-conducting, the JFET region diffuses lateral carriers from the gate to the floating p-type region in the direction perpendicular to the length of the MOS channel. The structure of the present invention reduces the forward conduction characteristics of the device without affecting the The gate capacitance of the device is reduced, especially the gate-collector capacitance, which improves the switching speed of the device and reduces the switching loss of the device without deteriorating the blocking characteristics of the device.

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 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 present invention relates to data communication, and discloses a TCP-based message transmission system and its method, which can effectively ensure the smooth start of fast restart when packet loss and error packets occur in the state of interactive data flow in TCP-based data message transmission. Transmission, thereby reducing the adverse impact on TCP traffic and delay, ensuring that the TCP data flow maintains a high rate and avoids continuous oscillation. The key of the present invention is that two socket connections are compounded into one communication channel, and each socket connection is only responsible for carrying data transmission in one direction and the ACK message of response, that is, the data message and ACK message in the same direction pass through different sockets Channel transmission, to avoid them being mixed together, affecting the effective progress of fast retransmission.

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.

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.