61results about How to "Duty cycle adjustable" patented technology

The invention discloses a phase type laser distance measuring system. The system comprises a laser for generating laser signals; an emission signal unit for generating emission signals and sending the emission signals to the laser after amplitude adjustment and power amplification are successively performed on the emission signals; a returning light receiving unit for receiving reflection signals of laser signals; a bias driving unit for providing offset voltages for driving the laser to emit the laser signals; and a controller for outputting PWM pulse voltage signals with an adjustable duty ratio to the bias driving unit to form the offset voltages and receive the emission signals. When the controller receives that the emission signals involves weak reflection, the controller reduces the duty ratio of the PWM pulse voltage signals and improves the amplitude of the emission signals in a linkage mode; and when the controller receives that the emission signals involves strong reflection, the controller increases the duty ratio of the PWM pulse voltage signals and reduces the amplitude of the emission signals in a linkage mode. The system provided by the invention has the advantages of simple system, high anti-interference capability and high distance measuring accuracy.

A microwave oven having metal sub-wavelength structure belongs to the technical field of microwave heating and relates to the electromagnetics of metal sub-wavelength structure, comprising a microwave oven cavity, a magnetron, a wave guide, and a microwave output window; and further comprising a dielectric plate having a metal sub-wavelength structure and fixed on the wall of the microwave oven cavity in front of the microwave output window through a support. The microwave energy from the magnetron passes through the metal sub-wavelength structure on the dielectric plate and radiates in the microwave oven cavity via the microwave output window; metal surface electronics and the microwave energy can be coupled by the metal sub-wavelength structure to effectively improve the uniformity of microwave energy distribution. The invention not only can effectively improve the uniformity of microwave field distribution in the microwave oven cavity, but can effectively improve the energy transmission efficiency and reduce the cost of the microwave oven by increasing the space utilization of the microwave oven cavity on the basis of safety.

The invention relates to a pure hardware simulation controller for a DC brushless motor. The pure hardware simulation controller comprises a Hall sensor and decoding unit, a digital logic controller and an intelligent power module (IPM), wherein the Hall sensor and decoding unit detects a position signal of a rotor and transmits the signal to the digital logic controller. The pure hardware simulation controller is characterized by further comprising a pulse width modulation (PWM) signal generation circuit, wherein a PWM signal output by the PWM signal generation circuit is input to the digital logic controller for processing; the output end of the digital logic controller is connected with the input end of the IPM; and the output end of the IPM is connected with a stator winding. The pure hardware simulation controller can conveniently regulate speed, rapidly meet requirements on the performance of different series of motors with different rotating speeds, reduce difficulties in research, development and production, decrease the rejection rate of the product, improve efficiency and reduce cost.

The invention provides an ultrasonic apparatus for preventing osteolysis from appearing around a prosthesis after joint replacement. The ultrasonic apparatus is mainly composed of a processor, an ultrasonic generator, an output probe, a display screen, an operation rotary knob, a power supply and an ultrasonic apparatus shell, wherein the processor and the ultrasonic generator are located in the ultrasonic apparatus shell, the processor, the ultrasonic generator and the display screen are connected with the power supply in series, and the ultrasonic generator is connected with the output probe. The ultrasonic apparatus is reasonable in design and convenient to carry, the ultrasonic frequency, the strength, the duty ratio, the working hour span and the area of the output probe can all be adjusted and matched with data bases composed of different parameters combinations, different types of parameter setting can be arranged as required, probes in different sizes can be adopted as required, corresponding low-energy ultrasonic waves are transmitted to the area around the prosthesis, therefore, the osteolysis is prevented from appearing around the prosthesis, reconstruction of bone trabeculas around the prosthesis is promoted, the bone mineral density around the prosthesis is improved, the service life of the prosthesis is prolonged, the ultrasonic apparatus is suitable for different people, no use contraindication exists, no invasive intervention occurs to a user, and the ultrasonic apparatus is relatively safe.

The invention relates to a low-power-consumption, adjustable-frequency and adjustable-duty-ratio clock generation circuit. The low-power-consumption, adjustable-frequency and adjustable-duty-ratio clock generation circuit is characterized in that the circuit includes a DAC (Digital-to-Analogue Conversion) circuit, a charge pump circuit, a comparator circuit, a feedback signal generating circuit and a buffer stage circuit; the DAC circuit receives digital control signals and is electrically connected to the charge pump circuit; the charge pump circuit is electrically connected to the comparator circuit; the comparator circuit is electrically connected to the feedback signal generating circuit and the buffer stage circuit; and the buffer state circuit outputs clock signals CLK. According to the invention, stable, precise adjustable-frequency and adjustable duty-ratio clock signal output can be obtained. Besides, the charge pump circuit is simple in structure and is insusceptible to influence of technique, temperature and voltage change. The clock signal output path is extremely simple and a low signal jitter characteristic is realized.

The invention provides a new energy vehicle AC charging pile cluster and a power control method based on a cloud platform. According to the invention, the charging power of the charging pile cluster can be regulated by a cloud server according to the total power distribution allowance of the current use place. The power control method of the present invention comprises the following steps: 1) a cloud platform sets the total power threshold of the charging pile cluster and sets a rated maximum power and a rated minimum power of the charging cluster; 2) the cloud platform obtains the current charging voltage and current information uploaded by each charging pile in use in the charging cluster in real time; 3) the cloud platform performs total power accumulation, and sends power adjustment instructions to each charging pile according to the accumulated real-time total power of the charging; and 4) the charging piles receive the power adjustment commands from the cloud platform, adjust thePWM duty cycle according to the set gear position, and upload the adjusted real-time charging data after the adjustment.

The invention relates to an alpha-Fe2O3/Au nanometer-circular-truncated-cone-array photoelectrode and a preparing method and application thereof. The alpha-Fe2O3/Au nanometer-circular-truncated-cone-array photoelectrode is composed of a quartz nanometer-circular-truncated-cone-array substrate, an ITO adhesion layer, an Au layer and an alpha-Fe2O3 layer which are sequentially arranged. The preparing method includes the steps that a nanometer-circular-truncated-cone-array pattern is prepared on the surface of quartz, and the quartz nanometer-circular-truncated-cone-array substrate is obtained; the ITO layer, the Au layer and the Fe layer are sequentially grown on the obtained substrate, then annealing treatment is conducted to form a photoelectric oxidation layer, and the photoelectrode of ananometer-circular-truncated-cone-array structure is obtained. According to the alpha-Fe2O3/Au nanometer-circular-truncated-cone-array photoelectrode and the preparing method and application thereof,by introducing the nanometer-circular-truncated-cone-array structure, a photo-anode material of a high-order nanometer-circular-truncated-cone-array structure is obtained, and the photocatalysis activity of the electrode is remarkably improved. Meanwhile, the preparing method is simple, high in controllability and low in cost, the production cost is greatly reduced, and good application prospectsare achieved.

The invention discloses a method for controlling a positive and negative commutating pulse power supply. The method includes the steps that a multi-element mixed control unit is utilized to receive signals fed back by a feedback unit, and mixed control signals are calculated and synthesized according to the feedback signals; a driving unit drives a high-speed switch device of an H bridge circuit to form pulses according to the received mixed control signals; a shaping circuit conducts filtering reduction processing on the pulses output by the H bridge circuit, and the pulses with the required frequency, the duty ratio and the amplitude are acquired. According to the method for controlling the pulse power supply, a control system is simple in structure and high in control accuracy, anti-jamming capacity and response speed. The H bridge circuit outputs the frequency, the duty ratio and the amplitude of the pulses, and then the pulses are shaped by the shaping circuit, large fluctuation is prevented from being output to damage electroplating equipment and electroplating products, meanwhile, the frequency and the duty ratio of positive pulses and negative pulses, the amplitude of the positive pulses and the amplitude of the negative pulses can be adjusted respectively, and can be changed and switched in an undisturbed mode.

The invention discloses a swept source based on a multi-rotating mirror and with an adjustable initial wavelength and duty cycle and relates to the swept source optical coherence tomography technology. The swept source is characterized in that a signal generator 6 outputs a first signal and a second signal which are identical in period and different in duty cycle, a tunable filter drive module 7 is connected with the first signal and used for driving the multi-rotating mirror 10 in a tunable filter 3, and a current control module 5 is connected with the second signal and used for modulating the injection current waveform of a semiconductor optical amplifier 1. The swept source has the advantages that the time delay between the current control module 5 and the tunable filter drive module 7can be regulated by regulating the initial time delay, compared with the second signal, of the first signal, and accordingly, the initial wavelength of the output spectrum of the swept source can be changed; the injection current waveform of the semiconductor optical amplifier 1 is regulated by changing the first signal input to the current control module 5, and accordingly the spectrum output range of the semiconductor optical amplifier 1 is controlled, and the duty cycle of the swept source can be regulated finally.

The invention belongs to the technical field of electronic instruments, and particularly relates to a high-frequency and high-voltage circuit, which can be applied to a mass spectrometer. The circuit comprises control circuits 1, 2 and 3, an isolation circuit 4, a switching circuit 5 and a filter circuit 6, wherein each control circuit is composed of a programmable logic device and a driving amplification circuit; the output end of the amplification circuit is connected with a primary circuit input pin of a differential mode coupled circuit, and a signal is isolated by the differential mode coupled circuit and then transmitted to a secondary circuit; the output pin of the differential mode coupled circuit is connected with the control electrode of a control switch, an external adjustable DC power supply is connected with the input end of the switching circuit via the filter circuit formed by a differential mode inductor and a capacitor, and the output end of the switching circuit is connected with a post-stage load; and under control of the control circuits, the switching circuit outputs a square wave signal with high voltage, the filter circuit filters the inputted DC voltage, and a good square wave signal can be acquired. In comparison with other traditional high-frequency and high-voltage circuits, the duty ratio is adjustable conveniently, a diode is parallelly connected between the drain and the source of an MOS transistor, and safety of the circuit is improved.

The invention relates to the field of power circuits. The invention discloses a pulse power supply for electrostatic dust removal, which includes an intermittent pulse generating circuit and a narrow pulse generating circuit, the intermittent pulse generating circuit includes a three-phase thyristor and a three-phase step-up rectifier circuit, the three-phase thyristor The control end of the three-phase boost rectifier circuit is connected to the controller, the input end of the three-phase boost rectifier circuit is connected to the three-phase three-phase AC power supply through the three-phase thyristor, and the output end of the three-phase boost rectifier circuit is connected with the narrow pulse to generate The output end of the circuit is connected in series between the dust collection electrode and the discharge electrode of the electrostatic precipitator, and the dust collection electrode of the electric precipitator is grounded, so that the pulses of the intermittent pulse power supply generated by the intermittent pulse generation circuit are synchronously superimposed in series The pulse of the narrow pulse power supply generated by the pulse generating circuit is applied between the dust collecting electrode and the discharging electrode of the electrostatic precipitator. The invention also discloses a method for generating a pulse power supply for electrostatic dust removal. The invention has high dust removal efficiency, less energy consumption, easy circuit realization and low cost.

The invention relates to a small infrared power factor monitoring device for high-power industrial equipment. The small infrared power factor monitoring device comprises a signal detection processing part and a signal conversion receiving part; the signal detection processing part comprises a primary current transformer, a secondary current transformer, a three-phase voltage signal, an SoC embedded module, an infrared laser wireless transformation circuit, an operation panel, a display interface and a power circuit; the signal conversion receiving part comprises an infrared laser wireless receiving circuit and a USB (universal serial bus) conversion circuit. The small infrared power factor monitoring device is reasonable in structure and convenient in use, electromagnetic interference in small signals can be effectively avoided for the monitoring device, greater protection measurement range is guaranteed, and measurement accuracy is high.

The invention relates to a phase-locked loop device applied to an FPGA chip, and the device comprises a mode control unit which is used for obtaining a second reference clock according to a first reference clock, determining a first frequency division mode according to a preset frequency division mode, and obtaining a second feedback clock according to a first feedback clock and the first frequency division mode; a PLL analog core unit which is used for obtaining a second clock signal according to a second reference clock and a second feedback clock; And a frequency adjustment unit which is used for determining a second frequency division mode according to a preset frequency division mode and carrying out integer frequency division and/or non-integer frequency division on the second clocksignal according to the first frequency division mode and the second frequency division mode. According to the invention, the mode control unit, the PLL simulation core unit and the frequency adjustment unit are utilized, so that the phase-locked loop device can realize static configuration and dynamic configuration, and the application diversity and the design flexibility are improved.

The invention discloses a timing air injection tethered combination dragging deorbiting method and system based on a winding and unwinding device. The timing air injection tethered combination dragging deorbiting method and system can be applied to a dragging removal task after a space flying net captures a target. For a space control unstable target, after the flying net is used for capturing thetarget, a task satellite pulls a tether once at set intervals to generate tension in a fixed-time air injection mode, so that the target is dragged to deorbit. In a non-air-injection time period, therelative distance between two satellites is close, and the tether may loosen; a threshold value is designed for the loosening degree of the tether; when the loosening degree of the tether exceeds thethreshold value, a tether winding and unwinding device is adopted for winding the tether, and it is guaranteed that the loosening length of the tether is within a certain range; when the relative distance between the two satellites is smaller than the threshold value after multiple times of tether winding, the task satellite jets and moves away, and meanwhile, constant small tension is generatedthrough the constant tension generating capacity of the winding and unwinding device.

The invention relates to the technical field of flexible direct-current power transmission and distribution, and particularly provides a direct-current circuit breaker based on an auxiliary oscillation converter device and a control method thereof, and the direct-current circuit breaker comprises a main branch, a transfer branch and an energy absorption branch which are sequentially connected in parallel; the main branch is composed of a mechanical switch CB; the transfer branch is composed of a resonant inductor L, a resonant capacitor C and an auxiliary oscillation converter device AOD; the energy absorption branch is composed of a lightning arrester MOV. The technical scheme provided by the invention has the characteristics of short total current on-off time, large on-off current and the like, solves the problems of long total current on-off time of an existing mechanical direct-current circuit breaker and high cost of a hybrid direct-current circuit breaker, and can be applied to harsh working conditions such as full-range short-circuit current quick on-off required by a middle-high voltage flexible direct-current power grid.

The invention discloses a time domain interleaved ADC multi-phase clock generation circuit comprising a signal conversion module used for generating first, second, third and fourth output signals according to first and second input signals; a first frequency division module and a second frequency division module used for carrying out frequency division processing on the first output signal, the second output signal, the third output signal and the fourth output signal to obtain a first frequency division signal and a second frequency division signal; a signal coupling module used for carryingout mutual coupling processing on the first frequency division signal and the second frequency division signal to obtain a frequency division coupling signal; a multi-channel clock signal module usedfor carrying out signal processing on the frequency division coupling signal according to a preset signal processing rule to obtain a multi-channel clock signal; and a driving circuit module used forcorrecting the multi-channel clock signal to obtain a final multi-phase clock signal. According to the invention, the output ends of the first frequency division module and the second frequency division module are subjected to mutual coupling processing, so that the continuity of frequency division signals is enhanced, and the sequential relationship between the signals is better.