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

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%.

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.

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 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.

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 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.