34results about How to "Duty cycle regulation" patented technology

The solution method for preparing metal photonic crystal belongs to the technical field of nano photoelectron materials and devices thereof. The existing method for preparing metal photonic crystal is faced with the problems such as high cost, low efficiency and small area of preparation, etc. In the invention, sequentially, optical resist is rotatably coated on a substrate; the interference photolithography is adopted to prepare one-dimensional or two-dimensional nano optical grating structures; metal nano particle sol is rotatably coated and goes through low temperature heat treatment, thus obtaining the metal photonic crystal. The invention has the advantages of low cost, high efficiency and preparation of the metal photonic crystal in a large acreage and the like.

The invention provides a self-excitation-reinforcing high-voltage conversion system of a switch reluctance generator. The system is composed of three conversion branches and an isolation and voltage-down DC/DC converter. The input ends of the three conversion branches are connected in parallel, the output ends of the three conversion branches are connected in series, thus, higher voltage output isobtained, excitation reinforced parts are distributed in all the conversion branches where all phases of windings are located respectively, independent excitation power sources are omitted, the system reliability is improved, and the advantages of a switch reluctance motor are effectively utilized. As input end voltages are far lower than output end series total voltages, voltage withstanding ofinternal devices is low, meanwhile, the switching frequency of all switching tubes is within a low-and-medium frequency range, and losses are low. The system is very suitable for converters of all switch reluctance generators, and especially is oriented to high-voltage loads or grid-connection requirements.

The invention relates to a control device and a method for improving the stability of a laser. The device comprises a reference clock used for generating a basic clock signal; a control unit used foroutputting a modulation pulse signal to an acousto-optic modulator according to a basic clock signal generated by the reference clock and a trigger signal input by an external control interface; and the acousto-optic modulator used for modulating and outputting a laser pulse according to the modulation pulse signal. The reference clock is connected with the control unit, and the control unit is connected with the acousto-optic modulator. Trigger signals which do not meet the requirements are filtered out. High-peak power optical pulses are prevented from being generated due to the fact that the frequency exceeds the range. Meanwhile, first laser pulses are prevented from being achieved by adjusting the duty ratio of modulation pulse signals, and the high-peak power optical pulses are prevented from being generated.

The invention provides a quick controllable manufacturing method of a large-area micron/nanometer texture on a metal material surface; and the method realizes the preparation of simple-complex, large-area and controllable-size micron/nanometer structures on metal surfaces with low cost and high efficiency through combining with the characteristic that the laser interference photoetching and the micro electrolytic machining both can reach submicron-level and nanometer-level resolutions and by using the characteristics that the laser interference photoetching is easy to realize large-area exposure and the micro electrolytic machining can machine all electric conducting materials. The method can reduce the machining cost and largely shorten the machining period, and has significant meaning on the research of tribological properties of textured surfaces.

The invention relates to a switch tube control pulse driving method which comprises the following steps: an object pulse control signal is divided into two control signals that are the same in pulse width via a digital control chip, the two control signals are respectively connected to anti-phase totem poles after being output via the digital control chip, then the two control signals are respectively connected to two ends of a primary side winding of a pulse transformer via the anti-phase totem poles, a group of homonymous terminals at a secondary side of the pulse transformer are connected to form a place for driving output, the other group of homonymous terminals are respectively connected to anodes of two diodes, the signals are connected to a voltage divider resistor after two cathodes are connected with each other, then the signals are subjected to voltage dividing operation, the signals are connected to an input end of a driving chip, and an output end of the driving chip is connected with a gate pole current-limiting resistor of a switch tube in a power circuit. According to the switch tube control pulse driving method, a defect that a conventional electromagnetic isolation driving method and a conventional optoelectronic isolation driving method result in difficulty in designing a high frequency and high power density converter can be overcome. The switch tube control pulse driving method is high in responding speed, high in dielectric strength of the primary side and the secondary side, and strong in common mode interference suppressing capability; duty ratio constraints caused by a fact that the primary side of the pulse transformer needs magnetic recovery can be removed.

The invention discloses a duty ratio adjusting circuit and an implementation method thereof. The duty ratio adjusting circuit comprises a DC bias voltage adjusting circuit used for converting a digitalized input clock signal CLK _ in into a DC bias voltage controlled clock; a phase inverter used for converting the DC bias voltage controlled clock into a digitalized clock signal CLK _ out; a control voltage generation circuit used for generating a control voltage under the control of high and low levels of the output clock signal CLK _ out, wherein the control voltage is connected to the DC bias voltage adjusting circuit to adjust the DC bias voltage of the DC bias voltage controlled clock output by the DC bias voltage adjusting circuit. By adoption of the duty ratio adjusting circuit, the duty ratio adjusting circuit capable of adjusting the duty ratio of signals to 50% is realized.

The invention provides a photovoltaic solar system, a control method thereof and a computer readable storage medium, and the method comprises the steps of: acquiring the output power and sampling current of a current sampling period and a previous sampling period; judging whether the working environment is a multi-power extreme value environment or not according to the output power and the sampling current of the current sampling period and the previous sampling period; if it is confirmed that the current working environment is a multi-power extreme value environment, changing the duty ratios of pulse modulation signals at a preset first step length, calculating the output power corresponding to each duty ratio, searching the target duty ratio of the pulse modulation signal corresponding to the maximum output power, and adjusting the duty ratio of the pulse modulation signal output by a DC converter to the target duty ratio. The invention further provides a photovoltaic solar system for implementing the method and a computer readable storage medium. According to the invention, the duty ratio corresponding to the pulse modulation signal corresponding to the maximum value of the output power can be quickly searched, and the production cost of the photovoltaic solar system can be reduced.

The invention provides an electromagnetic valve switch control method and system and an air conditioner, and relates to the field of air conditioner electromagnetic valve switch control. The electromagnetic valve switch control method aims at solving the problem that customer use is affected due to the fact that existing air conditioner switch components produce large noises when turned off or turned on. The electromagnetic valve switch control method comprises the steps that whether an on-off controller sends a turn-off or turn-on signal to an electromagnetic valve switch or not is detected, and when the turn-off or turn-on signal is detected, the current of an electromagnetic coil in the on-off process of the electromagnetic valve switch is controlled by adjusting the voltage to produce gradual gentle or segmented step type changes. The specific implementation mode of the electromagnetic valve switch control method comprises the step that the duty ratio of a control signal in the turn-off or turn-on process of the electromagnetic valve switch is adjusted, and then the current of the electromagnetic coil is adjusted. According to the electromagnetic valve switch control method and system and the air conditioner, the duty ratio of the control signal in the on-off process of the electromagnetic valve switch is adjusted, so that the change mode of the current in the electromagnetic valve coil is converted from hopping to gradual gentle, the electromagnetic force can be changed gently, the impulsive force magnitude is reduced, and noises caused by collision are effectively reduced.

The invention discloses a noise control method and system for an electromagnetic valve and an air conditioner, relates to the field of noise reduction control of air conditioner electromagnetic valves and aim at solving the problem that when a current air conditioner switch component is switched off or switched on, great noise is generated, and use of a user is affected. The critical voltage duty ratio of the electromagnetic force in the electromagnetic valve is detected when the balance state of a metal bolt is maintained; whether a switch controller sends switching-off or switching-on signals to the electromagnetic valve or not is detected; and the duty ratio of the control signals in the switching-off or switching-on process of the electromagnetic valve is adjusted in a segmented manner according to the critical voltage duty ratio. According to the noise control method and system for the electromagnetic valve and the air conditioner, the duty ratio of the control signals is adjusted in the switching-on and switching-off processes of the electromagnetic valve so that the jumping changing type of currents in an electromagnetic valve coil is transformed into a gradually and gently changing type, and therefore the electromagnetic force can be gently changed, impulsion is reduced, and the sounds generated by collisions are effectively lowered.

The invention discloses an ETC door frame light supplement lamp automatic control method and device. The method comprises the steps: acquiring the light intensity of the current environment of an ETC door frame; turning on or turning off a main light supplement lamp or a standby light supplement lamp in ETC portal frame light supplement lamps according to the light intensity of the environment; and when the light supplement lamp is turned on, adjusting the duty ratio of the ETC door frame light supplement lamp in real time according to the change of the light intensity of the environment, so that the definition of the image of the ETC door frame camera is ensured, and the automatic control of the light supplement lamp is completed; and the problems of driving potential safety hazards caused by simultaneous turning-on of the main and standby light-supplementing lamps and energy consumption caused by simultaneous turning-on of the main and standby light-supplementing lamps and incapability of adjusting brightness are solved.

The embodiment of the invention provides a clock duty ratio calibration circuit and calibration method, and the circuit comprises a transmission circuit for receiving an input clock signal and sendingan output clock signal, wherein the transmission circuit is provided with a first node and a second node; a first pull-up circuit which is connected to the first node and charges the first node; a second pull-up circuit which is connected to a second node and charges the second node; a first pull-up current adjusting circuit which is connected with the first pull-up circuit, wherein the chargingrate of the first pull-up circuit to the first node is changed by changing the pull-up current of the first node so as to adjust the duty ratio of the output clock signal; and a second pull-up currentadjusting circuit which is connected with the second pull-up circuit, wherein the charging rate of the second pull-up circuit to the second node is changed by changing the pull-up current of the second node so as to adjust the duty ratio of the output clock signal. According to the embodiment of the invention, different nodes on the transmission circuit are charged, so the duty ratio of the output clock signal of the transmission circuit can be quickly and accurately adjusted to about 50%.

The invention relates to the technical field of servo motor control, in particular to a servo motor voltage control method. The method comprises the following steps: S1, collecting the current working voltage of a servo motor through a controller, repeatedly executing the S1 when the collected working voltage is within a set range,and executing S2 when the collected working voltage exceeds the set range; and S2, adjusting the input voltage of the servo motor by adopting a phase-shifted full-bridge circuit, and repeating the S1 after each adjustment is completed. The controller keeps the preset duration of power-on of a transformer in the phase-shifted full-bridge circuit each time unchanged, and the phase-shifted full-bridge circuit controls the change of the signal frequency to realize the adjustment of the duty ratio of the preset duration of power-on of the transformer, thereby realizing the adjustment of the working voltage. According to the method, the whole working process of the servo motor can be timely and effectively controlled, a frequency conversion control mode is adopted, the stability of output voltage is improved, and the service life of the motor is prolonged.

The invention provides a control method for reducing a current fluctuation of a switched reluctance motor in a current chopping control mode. The control method is suitable for the switched reluctancemotors of various phase numbers and structures under a non-inductance model. The control method is characterized in that a conduction period is divided into a phase change section and a separate conduction section according to a position sensor signal; a given current is determined by a given rotating speed and an actual motor rotating speed obtained by calculation through a position sensor; thecurrent of a winding of each phase is collected through a hall current sensor; a PWM duty ratio of the phase change section and a PWM duty ratio of the separate conduction section are respectively adjusted according to the given current and the actual currents of the winding of each phase at the phase change section and the separate conduction section; and inputs of a controller are a rotating speed difference, the actual current of the winding and the position signal, and outputs are the PWM duty ratios, so that the control of a power converter is realized, the power converter controls the on-off of the electric energy of the switched reluctance motor, and the motor rotating speed is controlled. According to the control method, the steady-state characteristic of the switched reluctance motor is improved, the steady-state operation efficiency is improved, and the motor output torque ripple is reduced.

The invention discloses an ultra-low power consumption timing switch system and an implementation method. The ultra-low power consumption timing switch system comprises an LX04 low-frequency oscillator, a frequency duty ratio adjusting module and a triggering module, the LX04 low-frequency oscillator, the frequency duty ratio adjusting module and the trigger module are sequentially connected, the LX04 low-frequency oscillator is used for generating signals, the frequency duty ratio adjusting module adjusts pulses output by the LX04 low-frequency oscillator according to expectation, and the trigger module controls on-off of a load through the signals output by the frequency duty ratio adjusting module. The timing switch is internally provided with a timer with ultra-low power consumption and adjustable frequency duty ratio, the power consumption of the timer is far lower than that of an existing low-frequency oscillator and reaches the nW level, and the trigger module controls on-off of a load through a signal of the timer. In this way, the static power consumption and the timing power consumption of the system are greatly reduced.