44results about How to "Guaranteed amplitude" patented technology

The invention relates to the field of circuit design, and discloses a novel crystal oscillator circuit. A principal oscillation metal-oxide-silicon (MOS) tube circuit is imaged, bias of a principle oscillation tube is indirectly controlled by controlling direct-current bias of an imaging tube, so that a direct-current level of a sinusoidal signal outputted by the crystal oscillator is biased to a preset value, control over the direct-current level of the output signal is realized, Miller compensation can be used for compensating the stability of a negative feedback control loop, and the stability of the system is guaranteed on the premise that not a very large chip area is occupied. An output signal of a peak detection circuit is compared with a second fixed level by a second operational amplifier so as to dynamically adjust a value of a bias current and to ensure that the output signal is maintained at preset amplitude.

A high pass digital filtering method of nutation frequency automatic track includes testing K phi phi without cross decoupling control, using Hall transducer to detect rotary speed of rotor and obtaining said rotary speed by microprocessor after regulation, substituting obtained rotary speed into nutation frequency calculation formula and on-line calculating out nutation frequency, using calculated out nutation frequency as cut-off frequency to design digital filter and inputting rotor displacement signal to carry out on-line filtering calculation.

The invention provides a Ku-band constant-amplitude phase modulating feed component, and belongs to the field of electronic communication. The component is used for a feed network of an antenna and mainly comprises a partition circular polarizer, an orthogonal mode coupler, a rotary joint, a mode converter and the like, wherein the orthogonal mode coupler (OMT) is connected with the rotary joint and is used for generating linear polarization in a random direction and feeding the linear polarization into a square waveguide port of the partition circular polarizer. When the OMT rotates to different angles, the partition circular polarizer outputs two paths of signals which are the same in amplitude and of which the phase difference changes along with the angle, and has the function similar to that of a phase shifter as a whole. The ku-band constant-amplitude phase modulating feed component can be applied to a dual circularly polarized antenna, so that left-hand circular polarization and right-hand circular polarization are combined into linear polarization at a random angle. An in-band transmission system disclosed by the invention is good in flatness, small in loss, good in amplitude / phase consistency, wide in frequency application range, high in use reliability and suitable for a transmitting and receiving system of an on-the-move communication antenna.

The invention discloses a low-temperature microwave source, a low-temperature microwave source chip and a manufacture method thereof. The chip comprises a substrate, a transmission cavity, a bias junction, a voltage bias line and a direct current bias line, wherein the transmission cavity, the bias junction, the voltage bias line and the direct current bias line are located on the surface of the substrate. The transmission cavity comprises a SQUID chain and is used for emitting microwave photons. The bias junction is electrically connected with the transmission cavity and is used for generating microwave photons. The voltage bias line is used for applying bias voltage to the bias junction, so that electronic cooper pairs in the bias junction are transformed into microwave photons through stimulated emission. The direct current bias line is used for applying a magnetic field to the transmission cavity. The resonant frequency of the transmission cavity is determined by the total capacitance and total inductance of the SQUID chain. The total inductance of the SQUID chain varies with the size of the magnetic field. The size of the magnetic field varies with the magnitude of the current in the direct current bias line. According to the invention, the low-temperature microwave source chip generates microwave photons through stimulated emission; the stability of the frequency, the amplitude and the phase of emitted microwave photons is ensured; and microwave source requirements are met.

The invention discloses a control method of a series voltage compensation device. The control method comprises the following steps: acquiring a reference rated voltage of a three-phase system, a load side three-phase voltage, and a filter inductive current at the AC side of an inverter unit through a data acquiring unit; calculating the difference between the three-phase voltage at the load side and the reference rated voltage of the three-phase system through a first error comparator, and treating the difference as the input of a proportion resonance regulator; calculating the difference between the output of the proportion resonance regulator set and the filter inductive current through a second error comparator, and treating the difference as the input of a proportion controller; accumulating the output of the proportion controller and the front feed of network voltage, and treating the product of the accumulated value and the DC voltage coefficient as IGBT (Insulated Gate Bipolar Translator) input of the inverter unit; accumulating the IGBT output of the inverter unit and the network voltage, and then controlling the load voltage. According to the control method of the series voltage compensation device, the design of combining the series compensation device and the DC voltage coefficient when a network suffers from a fault quickly and effectively ensures the stability of amplitude of the load port voltage.

The invention relates to the technical field of groove profile rolling, in particular to an ultrasonic and pulse current mixing auxiliary wedge-shaped cavity profile rolling line and a rolling process. The ultrasonic and pulse current mixing auxiliary wedge-shaped cavity profile rolling line is characterized in that a left horizontal alignment roller, a pre-rolling roller, a left ultrasonic vibration roller, a left electric brush, a roller set, a right electric brush, a right ultrasonic vibration roller, a right height alignment roller and a right horizontal alignment carrier roller are sequentially arranged along the rolling line, the left horizontal alignment roller and a right horizontal alignment roller are composed of a left roller and a right roller which are horizontally arranged, the pre-rolling roller and the right height alignment roller are composed of an upper roller and a lower roller which are vertically arranged, the left ultrasonic vibration roller and a right ultrasonic vibration roller are composed of an upper roller and a lower roller which are vertically arranged, and the roller set is composed of an upper roller and a lower roller which are vertical arranged; the ultrasonic vibration module is connected with the left ultrasonic vibration roller and the right ultrasonic vibration roller, and drives the left ultrasonic vibration roller and the right ultrasonic vibration roller to vibrate ultrasonically; and the left electric brush and the right electric brush are connected with a pulse current source. The rolling difficulty of a wedge-shaped cavity profile is reduced, the rolling efficiency is improved, and the size precision and the surface finish of the wedge-shaped cavity profile are improved.

The invention relates to the technical field of wedge-shaped cavity sectional material rolling, in particular to an ultrasonic wave and induced current mixed auxiliary wedge-shaped cavity sectional material rolling line and a rolling process. A left horizontal calibration roller, a pre-rolling roller, a left ultrasonic vibration roller, a heating coil, an upper roller, a lower flat roller, a rightultrasonic vibration roller, a right height calibration roller and a right horizontal calibration carrier roller are sequentially arranged along the rolling line, the left horizontal calibration roller and the right horizontal calibration roller are composed of a left roller and a right roller which are arranged in the horizontal direction, the right height calibration roller is composed of the upper roller and a lower roller which are arranged in the vertical direction, the left ultrasonic vibration roller and the right ultrasonic vibration roller are composed of the upper roller and the lower roller which are arranged in the vertical direction, the upper roller and the lower flat roller are arranged up and down in the vertical direction, an ultrasonic vibration module is connected withthe left ultrasonic vibration roller and the right ultrasonic vibration roller and drives the left ultrasonic vibration roller and the right ultrasonic vibration roller to vibrate ultrasonically, andthe heating coil is connected with an induction current source. According to the ultrasonic wave and induced current mixed auxiliary wedge-shaped cavity sectional material rolling line and the rollingprocess, the processing forming performance is improved, the processing forming difficulty is reduced, the sectional material size precision and smoothness are improved, and the processing energy consumption is reduced.

The invention discloses an intelligent slipper low-temperature distance measurement device and method. The device comprises a distance detection module, a temperature module, a power management module, a battery, a main control module, and a wireless transmission module. The distance detection module, the wireless transmission module and the temperature module are respectively connected with the main control module, and the main control module is used for the operation coordination of a whole system. The method employs four types of methods to improve the low-temperature ultrasonic ranging precision according to temperature difference, and comprises the steps: correcting a sound speed through temperature; adjusting a driving voltage of an ultrasonic probe; dynamically adjusting the number of transmitted pulses according to the temperature, and adjusting the threshold voltage of a receiving end. Through the adjustment of software and hardware circuits, the device and method improve the distance measurement precision of an intelligent slipper under low temperature, especially in a northern cold region, and plays an important role in preventing a train from escaping and guaranteeing the safety.

The invention discloses a TDC-GP22-based ultra-large pipe diameter ultrasonic flowmeter and a method for signal enhancement thereof, and belongs to the field of instruments and meters. The TDC-GP22-based ultra-large pipe diameter ultrasonic flowmeter and the method for signal enhancement thereof are characterized in that MOSFET is adopted to convert a 3.3 V single-ended sending signal of the TDC-GP22 into a differential signal with the peak-to-peak value of 30 V which is directly exerted on a sending probe, so that the peak-to-peak value of the TDC-GP22 is increased by 10 times approximately; the receiving end amplifies the received differential signal into a single-ended signal through a differential amplification circuit, and adds a bias voltage to satisfy the requirement of the GP22 on the received signal, so as to accurately measure time. The TDC-GP22-based ultra-large pipe diameter ultrasonic flowmeter and the method for signal enhancement thereof have the effect and benefit that the peak-to-peak value of the sending signal is increased from 3.3 V to 30 V; when an ultra-large pipe with diameter of DN 400-DN 1200 is guaranteed, the receiving end can still receive an obvious signal; an amplification circuit is adopted to amplify the received signal, so that the amplitude provided for the received signal of the GP22 is fully guaranteed, and accurate measurement of sound wave transmission time is guaranteed.

The invention discloses a static-error-free automatic feedback high-precision fault inversion method, and the method comprises the steps: setting a preset short-circuit, grounding and anti-misoperation fault scene, applying high-fidelity voltage and current signals to a primary side through the control of software and hardware, verifying the fault research and judgment and processing functions andperformances of an intelligent switch, verifying the fault processing capability of a single device, in the hardware level, enabling the fault inversion test system to transmit the load side impedance to the source side through an impedance transmission mode, the control current adopts a current feedback mode, and through a fast-response static-error-free automatic feedback control circuit, driving a large-current MOS tube to generate nonlinear voltage to drive a load loop to obtain a high-precision primary signal, and then obtaining a high-precision measurement result in a two-path multi-channel high-precision synchronous sampling measurement mode; in the software level, for the steady-state signal, recovering the output signal once in real time, and enabling the voltage and current power source to perform compensation correction according to the load difference of the switch to be tested; for a transient signal, enabling the voltage and current power source to periodically perform amplitude and phase calibration setting according to the current output range in a segmented manner.

The invention discloses a signal calibration circuit for an industrial building fire fighting system. The signal calibration circuit for the industrial building fire fighting system comprises a frequency acquisition circuit, a mean push-pull circuit and a filtering emission circuit; the frequency acquisition circuit acquires a signal frequency of an input end in an analog signal transmission channel in a signal transmission module of the industrial building fire fighting system; a first path of the mean push-pull circuit applies an operational amplifier AR1 to follow up a signal, and a secondpath of the mean push-pull circuit applies an operational amplifier AR4 and a triode Q3 as well as a capacitor C2 to form a noise reduction circuit to reduce a signal-to-noise ratio; then an operational amplifier AR2 is applied to carry out addition processing on two paths of signals; an output signal of the operational amplifier AR2 is input into a mean circuit consisting of an operational amplifier AR3 and a diode D2 as well as a diode D3; the filtering emission circuit applies an inductor L2 and a capacitor C4 as well as a capacitor C5 to form a filtering circuit to carry out filtering on the signal; the filtered signal is sent into a control terminal of the industrial building fire fighting system through a signal emitter E1; and after being automatically calibrated, the signal is converted into an error correction signal of the control terminal of the industrial building fire fighting system.

A digital regulated Local Oscillator (LO) buffer receives an unregulated LO signal from a local oscillator to create a regulated LO signal. Embodiments include not only the digital regulated LO buffer, but also a transceiver and / or a receiver including at least one instance of the digital LO buffer. They may be implemented as an integrated circuit. The digital regulated LO Buffer may include: A LO buffer receiving the unregulated LO signal and an amplitude control signal to create the regulated LO signal. A peak detector receives the regulated LO signal to create an analog peak signal that is presented to a digital output comparator along with a reference amplitude signal to create a digital threshold detect signal. An amplitude controller receives the digital threshold detect signal to create a digital control signal that drives a digitally controlled source to create the amplitude control signal.

The invention discloses a power distribution cabinet management system based on the Internet. The system comprises a signal sampling module and a feedback noise reduction module, the signal sampling module samples carrier signals of a signal emitter node in the power distribution cabinet management system based on the Internet. The signal sampling module is connected with the feedback noise reduction module; a triode Q1 is used for detecting a potential difference between a resonance circuit output signal and a triode Q3 emitter signal; the accuracy of the signal amplitude is further ensured;a triode Q2 is used for feeding back the potential difference between the output end and the in-phase input end of the operational amplifier AR2; when the difference value is too large, it representsthat the output signal of the operational amplifier AR2 is not within the error range, the signal is fed back to the inverting input end of the operational amplifier AR1, and the power distribution cabinet management system terminal based on the Internet can make a quick response to carrier signal distortion in time from new noise reduction and frequency stabilization adjustment to the time when the output signal of the operational amplifier AR2 is within the error range.

The invention provides a dedusting color sand vibrating screen. The dedusting color sand vibrating screen comprises a base and a screen box. A screen is arranged in the screen box. A vibration exciter is arranged on the screen box. The screen box comprises a screen box main body and limiting bodies located on the two sides of the main body. Spring supporting devices are arranged between the limiting bodies and a bottom plate. A support is arranged on the base. An exhaust device is arranged on the support and comprises an air duct extending outwards from the top of the screen box, a fan located in the air duct, and fan blades located at an air duct port. Each flan blade comprises a fan blade main body and a material crushing plate which is close to one side of the screen box and can rotate relative to the fan blade main body. A water pipe is arranged at the side end of the top of the main body. A water mist spray nozzle is arranged on the water pipe.

The invention discloses a parameter determination method and system for an extra-high voltage direct current cable superposition impact test device. The parameter determination method comprises the steps of guiding the type selection of a voltage source of the extra-high voltage direct current cable superposition impact test device according to the test demands of an extra-high voltage direct current cable test sample segment, analyzing the efficiency and characteristics of the extra-high voltage direct current cable superposition impact test device, and selecting a reasonable resistance-capacitance isolation device for parameter configuration. Parameters of the voltage generator and the impulse direct-current voltage isolation element in the extra-high voltage direct-current cable direct-current voltage superposition impulse test device are determined by performing parameter calculation on the extra-high voltage direct-current cable and performing circuit simulation on the direct-current superposition impulse voltage test device, so that effective isolation of impulse voltage and direct-current voltage is realized, the output efficiency of the direct-current superimposed impulse voltage test device is brought into full play, thereby guaranteeing that the amplitudes of impulse voltage and direct-current voltage on a cable sample meet test regulations, and satisfying the requirement for the test device when an extra-high-voltage direct-current cable is subjected to a direct-current superimposed impulse voltage test.

The invention discloses an unbalanced signal extraction method based on variable-sampling-length correlation filtering. The method comprises the following steps: acquiring a maximum interference frequency and an unbalanced signal frequency: acquiring a vibration signal detected by a vibration sensor, performing MUSIC (Multiple Signal Classification) power spectrum estimation on the acquired signal after digital tracking and filtering to obtain the interference frequency with a maximum amplitude, and measuring the unbalanced signal frequency through a rotating speed sensor; determining a sampling length T: selecting a reasonable sampling length according to an interference degree distribution rule, judging whether the absolute value of a primary sampling length is integer multiples as large as an unbalanced signal or not, if so, determining the absolute value as the sampling length, otherwise, determining the sampling length as an adjacent integer multiples unbalanced signal period with a small interference degree; performing band-pass filtering on the acquired signal of which the sampling length is T, and extracting the phase and amplitude of the unbalanced signal by adopting a correlation filtering method. According to the unbalanced signal extraction method, the amplitude and phase extraction errors do not change along with the signal to noise ratio and the frequency difference between the signal and the interference, and the stability of unbalanced signal extraction is ensured.

The invention discloses a damping system used for a mechanical arm tail end detection sensor, and relates to the technical field of mechanical arm intelligent detection. The damping system comprises an amplitude detection sensing module, a fuzzy control system and a control motor module which are connected in sequence, the amplitude detection sensing module is carried on the tail end of a mechanical arm, and used for detecting the amplitude value of the tail end of the mechanical arm, the detected amplitude value is transmitted to the fuzzy control system, the fuzzy control system carries out fuzzification on the received amplitude value, according to the pre-formulated fuzzy rule, the change condition of the control motor module is judged, and a speed control instruction is output to the control motor module; the control motor module adjusts the self running condition according to the received speed control instruction; and the amplitude is fed back through the amplitude detection sensing module, through a fuzzy controller, the speeds of the mechanical arm in the horizontal direction and the vertical direction are controlled for ensuring that the amplitude of the tail end of the mechanical arm is within the allowable range, it is ensured that the mechanical arm can rapidly reach the designated position to be detected, and the detection efficiency is improved.

The invention provides a multi-line laser radar device and a light output power control method, the multi-line laser radar device comprises a plurality of laser emission assemblies, a plurality of laser receiving assemblies, an emission signal selection circuit, a receiving signal selection circuit, a controller and a feedback regulation circuit, the controller selects and drives the corresponding laser emission assemblies, and the feedback regulation circuit drives the corresponding laser emission assemblies. Echo signals of the corresponding receiving channels are obtained through the correspondingly-arranged laser receiving assemblies and the receiving signal selection circuit, the feedback adjusting circuit carries out signal processing on the echo signals, and high-voltage driving signals with the pulse width negatively correlated with the pulse width of the echo signals are output to the corresponding laser emitting assemblies. The output power of the laser pulse is automatically adjusted for objects to be measured with different reflectivity, the amplitude of the echo signal is ensured to be within a preset range, the stability of the echo signal is improved, the signal distortion is reduced, and the ranging precision is effectively improved while the laser receiving assembly is protected.

The invention belongs to the technical field of arbitrary waveform generation, in particular to a wideband signal conditioning device for an arbitrary waveform generator. As for that waveform amplitude, the device control the variable impedance element to adjust the gain at the input of the amplifier and the gain of the amplify respectively through the multi-channel DC DAC, so that the amplifier always operates in the wideband mode, and the channel gain is kept constant in a wide range of frequency bands. In the aspect of waveform bias, the device adjusts the supply voltage of the amplifier through a multi-channel DC DAC control power supply module to add bias to the waveform signal, so that the bias is out of the limit of the fixed supply voltage range of the amplifier. In addition, DC bias data is added to waveform data of high-speed DAC front-end to realize the superposition of two bias signals at the back-end of the device, so as to achieve the effect of enlarging the bias range.

The invention provides a ceramic loudspeaker which comprises an upper shell, a lower shell, a PCB and a ceramic sheet. The upper shell and the lower shell are in butt joint, and the PCB and the ceramic sheet are bonded and attached to form a vibration assembly. The ceramic loudspeaker further comprises an installation plate located between a bottom plate of the lower shell and the upper shell, and the vibration assembly is bonded and attached to the top face or the bottom face of the installation plate. Due to the fact that the installation plate is located between the bottom plate of the lower shell and the upper shell, a distance exists between the installation plate and the bottom plate of the lower shell; besides, the vibration assembly is bonded and attached to the installation plate, and thus a distance exists between the vibration assembly and the bottom plate; in this way, when the ceramic loudspeaker is applied to a wearable intelligent device, the vibration assembly cannot make direct contact with the outside part such as the human body, and the amplitude of the ceramic loudspeaker is ensured, so that the sound pressure level and the tone quality clearness degree of the ceramic loudspeaker are increased, and the subjective listening effect is improved.

The invention provides a modular magnetic flux switching linear motor based on a common coil bidirectional excitation unit. The modular magnetic flux switching linear motor comprises a motor primary structure; the motor primary structure comprises a plurality of primary modules with the same structure; each primary module comprises 2n units, the magnetizing directions of the permanent magnets in the two adjacent units of the same primary module are opposite, the 2n units of the same primary module share one centralized armature coil, and when the number of the armature coils contained in each phase of armature winding of the motor is an odd number or an even number, even-order harmonics of induced electromotive force are not contained.

The invention discloses an aircraft pilot steering force sensor signal conditioning circuit, system and method, and the circuit comprises three groups of signal processing circuits, and the input endsof the three groups of signal processing circuits are respectively connected with the output ends of a steering column force sensor, a steering wheel force sensor and a pedal force sensor. The outputends of the three groups of signal processing circuits are connected with the input end of the flight parameter and audio recording system; the signal processing circuit comprises an input filter circuit, a first-stage amplification circuit, a second-stage amplification circuit and a second-order filter circuit which are connected in sequence. The driving force of a driver can be collected and recorded in real time, and a basis is provided for flight control state and flight fault judgment. Output signal processing circuits of the steering column force sensor, the pedal force sensor and the steering wheel force sensor are independent of one another and do not interfere with one another.

An ultrasonic-assisted fusing device and a fusing method for vacuum ultra-high temperature refractory active materials relate to a fusing device and a fusing method. The invention solves the problem that the existing ultrasonic equipment reacts with the ultra-high temperature refractory active material alloy at high temperature, pollutes the ultra-high temperature refractory active material alloy melt, and damages the ultrasonic equipment. The ultrasonic generator of the present invention is installed in the furnace body, the water-cooled copper crucible is installed on the ultrasonic generator, the raw material is installed on the water-cooled copper crucible, the non-consumable electric arc furnace extends through the furnace body into the furnace body, and the pressure gauge is installed in the furnace body on the upper end face and communicates with the inside of the furnace body. The non-consumable arc gun is fed into single-phase alternating current for heating; the power of the non-consumable arc gun is reduced, and ultrasonic waves are introduced into the molten raw materials in the water-cooled copper crucible; after the ultrasonic treatment is completed, the power is reduced to a minimum, Then turn off the power. The invention is used for ultrasonic-assisted fusing of vacuum ultra-high temperature refractory active materials.