2390 results about "Signal production" patented technology

The invention relates to the technical field of power system automation, in particular to a real-time monitoring and fault positioning system for a vehicle-mounted mobile substation. The system comprises a signal acquisition and processing unit which monitors and acquires line parameters and environmental parameters of a transformer substation and traveling wave signals generated when a fault occurs in real time; the fault type identification unit calculates the confidence coefficient of each fault type based on the traveling wave signal so as to judge the fault type generated by the traveling wave signal, and marks the arrival time of the traveling wave head; an algorithm fusion positioning unit preliminarily positions a fault point according to the fault type and the arrival time of a traveling wave head, and then constructs a fitness function through a particle swarm optimization algorithm in combination with line topology and environmental parameters to correct a preliminary positioning error; according to the system, high-precision fault positioning and rapid isolation recovery are realized, the accuracy of fault section division in the complex power distribution network is ensured by modeling switch state and branch change, and misjudgment caused by topological change or equipment overload is effectively avoided.

The invention provides a clock signal generating circuit, a wired communication transceiver and electronic equipment, and the circuit outputs a first DC voltage comprising phase difference information and frequency difference information of a reference clock signal and a feedback clock signal through a phase frequency detection module. The pulse generator generates a narrow pulse signal based on the DC voltage and a reference clock signal, the oscillation frequency of each secondary ring oscillator in the cross-coupled ring oscillator is controlled by the first DC voltage, and the cross-coupled loop performs synchronous coupling and phase sequence adjustment processing on each secondary ring oscillator. One output node in the cross coupling ring oscillator receives the narrow pulse signal, frequency and phase locking is completed in an injection locking mode, and the frequency divider is used for conducting frequency division processing on any high-frequency clock signal and outputting a feedback clock signal. Therefore, a high-frequency multi-phase clock signal with low phase noise and high phase precision can be generated by using the low-frequency reference clock signal.

The invention discloses a self-calibration high-resolution PWM (Pulse Width Modulation) signal generating circuit, which belongs to the field of electronic circuits and comprises a PWM signal generating module, a high-resolution module, a calibration module, a register module and an AHB (Advanced High-performance Bus) interface. The PWM signal generation module generates a coarse adjustment PWM signal based on a comparison result of the comparison register and the counter; and the high-resolution module performs fine edge positioning on the coarse adjustment PWM wave to generate a fine adjustment PWM signal. Under the condition that the clock frequency is not changed, the high-resolution module can improve the resolution of the PWM signal. The calibration module has a high-resolution calibration function, and the high-resolution calibration function can avoid the deviation of a delay value caused by the environment and ensure the accuracy and stability of the high-resolution PWM. The register module is responsible for register read-write control. The AHB bus interface part is responsible for processing bus interface signals. The self-calibration high-resolution PWM signal generation circuit has the advantages of being high in precision, high in stability, easy to IP and the like.

The invention discloses a frequency hopping carrier signal detection method, system and device based on time-frequency analysis and a storable medium, and belongs to the technical field of frequency hopping carrier signal detection. According to the detection method, firstly, a sampling signal is subjected to combined time-frequency analysis transformation (STFTamp; according to the method, a to-be-detected time-frequency graph is obtained through a WVD method, structural elements of different scales are constructed through self-adaptive morphological filtering to process the time-frequency graph, noise and burst signals are removed, influences on to-be-detected frequency hopping signals are avoided, and the detection accuracy is improved. And then, aiming at the residual fixed-frequency signal and sweep-frequency signal interference, Hough transform is used for carrying out feature extraction on a straight line, and a frequency hopping signal is judged according to different time-frequency features of different signals, so that the detection process of the frequency hopping signal is completed. The detection method can be applied to a wireless sensor network and is used for realizing data communication and information transmission between sensor nodes. Through detection and analysis of the frequency hopping signal, the communication stability and reliability of the sensing network in a complex electromagnetic environment can be effectively improved.

The invention provides an array substrate and a display device, and the array substrate comprises a substrate; the gate insulating layer is arranged on the substrate; the data line is arranged on the gate insulating layer; the first passivation layer is arranged on the gate insulation layer and covers the data line; the first shielding electrode is arranged on the first passivation layer, and the first shielding electrode is connected with the direct-current voltage signal output end; the second passivation layer is arranged on the first passivation layer and covers the first shielding electrode; the common electrode is arranged on the second passivation layer, and a part of the common electrode is overlapped with the data line and the first shielding electrode; the pixel electrode and the common electrode are arranged on the same layer or stacked, and the pixel electrode is insulated from the common electrode. The first shielding electrode is connected to the direct-current voltage signal, so that the data voltage signal on the data line does not affect the signal on the common electrode, coupling capacitance between the common electrode and the data line is avoided, and poor display of picture flicker is avoided.

A radar based, fill level measuring device for determining fill levels in containers, wherein the fill level measuring device can be applied for a large number of different applications, includes a signal production unit designed to produce a first transmitted radar signals within a first frequency band and supplementally a second transmitted radar signal within a second frequency band that does not overlap with the first frequency band and is clearly separated therefrom. The evaluation unit of the fill level measuring device can determine a first fill level value based on the first received signal. Based on the second received signal potentially another fill level value can be determined. In this way, the fill level measuring device can be adapted as regards frequency band to the particular application. The ascertained fill level can be checked for plausibility by comparing the fill level values ascertained in different frequency bands.

The invention relates to a phase-locked loop circuit, a clock generator, a chip and electronic equipment, and the phase-locked loop circuit mainly comprises a phase frequency detector which is used for generating a phase detection output signal according to the phase of a reference clock signal and the phase of a feedback clock signal; the proportional path module is used for generating a first control current according to the phase discrimination output signal; the integral path module is used for generating a second control current according to the phase discrimination output signal; the current control oscillation module is used for generating a clock output signal according to the first control current and the second control current; and the feedback frequency divider is used for obtaining a feedback clock signal through frequency division of the clock output signal. According to the phase-locked loop, the advantages of the analog charge pump phase-locked loop and the full-digital phase-locked loop are combined, the generation of a high-performance clock which is small in area, high in bandwidth, stable in loop and low in quantization noise is facilitated, the applicability of the phase-locked loop to the high bandwidth requirement is facilitated, the quantization noise is reduced, and the performance of the phase-locked loop is improved. And unconditional stability of the phase-locked loop is realized theoretically.

According to the driving control circuit for the electrostatic chuck power supply and the electrostatic chuck power supply, the driving control circuit is arranged in the electrostatic chuck power supply, a high-voltage output voltage signal of a high-voltage amplifying circuit can be obtained through a signal generating and processing feedback circuit, and according to a negative feedback adjusting mechanism, the driving control circuit is used for driving the electrostatic chuck power supply. A power supply waveform control signal for controlling a high-voltage amplification circuit to output a high-voltage output voltage signal is adjusted, and the high-voltage output voltage signal output by the high-voltage amplification circuit is adjusted to be output, so that the effect of controlling the signal precision of the high-voltage output voltage signal output by the electrostatic chuck power supply is achieved, and the output stability of the electrostatic chuck power supply is improved. Therefore, the stability of an electrostatic field generated by the electrostatic chuck is guaranteed, and the wafer fixing process precision of the electrostatic chuck is ensured.

A self-adaptive high-dynamic spread spectrum tracking receiver relates to the technical field of satellite communication and comprises an AGC loop, an A / D converter, a PN code capturing and tracking loop, a single carrier loop, a despreading device, a phase discriminator, a phase shift signal generator and a low-pass processor. The method comprises the following steps of: converting a signal into a digital signal, subsequently generating an output tracking signal through a PN code capturing and tracking loop, processing through a single carrier loop to obtain a captured tracking signal and an amplitude excitation signal, and finally carrying out de-spreading and phase discrimination to generate an azimuth error voltage signal and a pitching error voltage signal; the receiver can stably receive and process spread spectrum signals sent by a high-speed target.

The invention provides a radio frequency front end module. The circuit comprises a first matching circuit, a first-stage power amplification circuit, a coupler, a first radio frequency switch, a radio frequency main path, an attenuation path, a second radio frequency switch, a second matching circuit, a second-stage power amplification circuit, a third matching circuit, a power detection circuit, a low-pass filter, a first operational amplifier and a hysteresis comparator. The hysteresis comparator is used for controlling the input end of the first radio frequency switch to be communicated with the first output end of the first radio frequency switch or the second output end of the first radio frequency switch; and meanwhile, the control circuit is used for controlling the first input end of the second radio frequency switch or the second input end of the second radio frequency switch to be communicated with the output end of the second radio frequency switch. According to the radio frequency front-end module, on the premise that the power amplification circuit is not damaged, normal output of the radio frequency signal can be ensured, and meanwhile the situation that a post-stage output signal is distorted due to reduction of the bias voltage is avoided.

A chip-scale mode-locked laser including a cavity including a gain medium for amplifying signal electromagnetic radiation (signal) through stimulated emission, the signal comprising a signal wavelength; and a passive or active mode-locking device to enforce pulse formation in the laser. The mode-locking device includes a thin-film waveguide having a thickness on the order of the signal wavelength so as to confine and guide the signal along the thin-film waveguide, and a material comprising a second-order nonlinear susceptibility to enable active or passive mode-locking of the signal. The mode-locking device leads to generation of pulses of the signal outputted from the mode-locked laser.

The invention relates to the field of pulse signal generation, and discloses an integer frequency signal generation circuit and method for a microprocessor, and the circuit comprises a flipping register, a frequency division register, a counter, a frequency signal flipping module, an integer frequency calculation unit, and a time delay unit. The integer frequency calculation unit is used for calculating the delay series of the fractional part of the frequency division value when the enable signal 1 is valid, and sending the delay series to the delay unit; and the delay unit is used for carrying out delay less than one clock period on the frequency signal output by the frequency signal overturning module according to the delay series sent by the integer frequency calculation unit, and outputting an integer frequency signal. According to the integer frequency signal output circuit disclosed by the invention, the frequency division value and the delay series of the frequency division register are automatically changed through the integer calculation module and the delay series calculation module, and the delay series controls the one-out-of-256 selector to be used for selecting the frequency signal output of the corresponding delay module in the delay unit, so that the generation of the integer frequency signal is realized.

The present invention relates to an on-board redundant controller and standby aviation sensors in-flight reconfigurable autonomous flight system, which includes UAV, primary autopilot module, secondary autopilot module and switching module. The primary autopilot module and secondary autopilot module are equipped with first aviation sensing module and second aviation sensing module. The primary autopilot module produces response signal according to the request signal produced by the secondary autopilot module. When the first response signal is no longer produced by the primary autopilot module for a preset time, the first switching module switches controls of the flight control module from the primary autopilot module to the secondary autopilot module, and the secondary autopilot module uses the aviation data of the second aviation sensing module to provide flight control signals to the flight control module.

The invention discloses a gas concentration detection circuit and method based on differential measurement and reference compensation, and the circuit comprises at least one active gas sensitive element, the electrical parameters of which change along with the concentration of a target gas; the sensitivity of the reference gas sensitive element to the target gas is at least lower than that of the active gas sensitive element by a preset percentage threshold value; the active gas sensitive element and the reference gas sensitive element are connected in a differential pair form to form a differential signal generation unit; the differential amplification circuit is used for amplifying the differential signal output by the differential signal generation unit; the output signal of the differential amplification circuit is used for representing the concentration information of the target gas. According to the invention, environmental interference and baseline drift are directly and effectively suppressed from the hardware level, the stability and selectivity of gas concentration measurement are improved, and meanwhile, the holding circuit is simple in structure, low in cost and convenient for large-scale application.

A driving circuit, a driving method, a driving module and a display device are provided. The driving circuit includes a driving signal generation circuit, a gating circuit, an output control circuit, an output circuit, a voltage control circuit and a third control node control circuit. The third control node control circuit is electrically connected to the first node and the third control node respectively, and is configured to control the potential of the third control node according to the potential of the first node.

The invention relates to the technical field of medical equipment, and provides a focused ultrasound system with multiple treatment modes. The drive circuit comprises a signal generation module which outputs a first ultrasonic generation signal suitable for a thermal ablation mode or a second ultrasonic generation signal suitable for a histotripsy mode; the energy amplification module comprises a signal end, a power supply end and an output end coupled with the ultrasonic transducer; the energy amplification module comprises an isolation driving circuit which outputs a first switch driving signal and a second switch driving signal which are opposite based on an input ultrasonic generation signal; and the power amplification circuit comprises a second switch unit and a first switch unit which are set to be in opposite switch states by opposite driving signals so as to output ultrasonic driving signals to excite the ultrasonic transducer to form focused ultrasound in a histotripsy mode or a thermal ablation mode. The driving circuit is simple in structure and easy to realize, and can meet power supply requirements of various modes such as thermal ablation, histotripsy and the like.

The invention relates to the technical field of wireless communication, in particular to an OTA upgrading method and system for Bluetooth sound equipment. The method comprises the following steps: acquiring to-be-upgraded firmware data and currently played audio data, and acquiring power amplifier current feedback data of a sound speaker by sending a double-frequency detection signal containing 21kHz and 22kHz; acquiring equipment transmission capability confirmation data according to a silent response mode of the sound equipment to the preset handshake signal; and calculating a nonlinear distortion coefficient of the loudspeaker according to the intensity of the 1kHz difference frequency component in the power amplifier current feedback data, and obtaining real-time channel evaluation data based on current waveform deviation analysis. According to the method, the nonlinear distortion degree of the loudspeaker is accurately evaluated through the 1kHz difference frequency component generated by the 21kHz and 22kHz dual-frequency detection signals, so that the reliability of data transmission is more accurately predicted.

Disclosed in the present invention are a displacement detection circuit for a piezoelectric actuator, and a piezoelectric actuator. The piezoelectric actuator is used for generating haptic feedback on the basis of a received haptic voltage signal when an external force is applied. The displacement detection circuit comprises: a charge storage element, which is used for detecting first charges generated by a piezoelectric actuator due to deformation; a compensation circuit, which is used for performing multiple charging operations or discharging operations on the charge storage element, so as to provide the charge storage element with second charges which are opposite to the first charges; a counting circuit, which is used for counting the number of charging operations or discharging operations performed on the compensation circuit, so as to obtain a count value; and a logic output circuit, which is used for calculating, on the basis of the count value, a total charge amount of the second charges provided by the compensation circuit, and obtaining a real-time displacement amount of the piezoelectric actuator on the basis of the total charge amount. A displacement amount of a piezoelectric element during a haptic feedback process can be detected without the provision of sensors, thereby being conducive to simplifying a circuit, reducing costs, improving the product performance and reducing the power consumption.

The invention provides an automatic frequency locking circuit based on a time-to-voltage converter and a phase-locked loop, and relates to the technical field of phase-locked loops, a first frequency-halving unit and a second frequency-halving unit respectively carry out frequency-halving processing on a reference signal and a frequency division signal of a current comparison period to obtain a first square wave signal and a second square wave signal; the first square wave signal and the second square wave signal are transmitted to the time-to-voltage converter; the time voltage converter comprises a phase generation unit, a first charge pump and a second charge pump, the phase generation unit generates an enable signal according to the first square wave signal and the second square wave signal, and the first charge pump and the second charge pump respond to control of the enable signal and collect single pulse signals from the first square wave signal and the second square wave signal respectively so as to supply power to the input end of the comparator; the comparator compares power supply voltages of the two input ends to achieve frequency comparison of the reference signal and the frequency division signal. And selection in a plurality of phase signals is not needed, and required digital circuit modules are reduced, so that the delay of the reference signal and the frequency division signal in the conversion process is reduced.

The invention discloses a quantum magnetometer device based on a diamond nitrogen-vacancy color center. The quantum magnetometer device comprises a laser emission unit used for generating a 532nm laser beam based on a laser trigger signal; the beam shaping unit is used for focusing the laser beam to the diamond sample; the diamond sample comprises an NV color center array with specific depth on the surface or in the diamond sample, and electrons in NV color centers are excited based on laser beams to transition and generate fluorescence; the fluorescence collection unit is used for separating exciting light from 650-800nm fluorescence signals and converting the fluorescence signals into multi-channel electric signals; the microwave radiation unit is distributed around a diamond sample space and emits three independently regulated microwave frequencies at the same time; and the control and processing unit is used for receiving and processing the multi-channel electric signals in real time and analyzing magnetic field parameters based on the optical detection magnetic resonance spectral line. Synchronous measurement of a three-dimensional magnetic field is realized, and the limitation of single-axis measurement of a traditional NV magnetometer is broken through.

An isolated DC-DC converter is provided, including a full-bridge switching stage, a resonant network, a transformer, an output stage, an output stage, an error amplifier, a feedforward controller, a charge sensor and a switch controller. The output stage generates an output signal, wherein the output signal is an output voltage or output current. The error amplifier generates an error signal based on the output signal and a reference signal, wherein the reference signal is a reference voltage or reference current. The feedforward controller senses an input voltage of the full bridge switching stage, and generates a feedforward control signal based on the sensed signal. The charge sensor generates at least one charge sensing signal. The switch controller generates and provides switch control signals to the plurality of active switches in charge control mode based on at least the error signal, the feedforward control signal and the charge sensing signal.

The invention provides a time sequence control circuit, a data driving circuit, a display panel and a data output method. Wherein the time sequence control circuit is used for receiving an image signal and correspondingly outputting a data signal and a data latch signal, and the time sequence control circuit at least comprises a detection unit and a signal generation unit. The detection unit determines a corresponding refresh rate according to the data signal and outputs a corresponding detection signal. The signal generation unit outputs a data latch signal according to the detection signal, and adjusts the duty ratio of the data latch signal or the switching speed of the two potentials when the refresh rate is increased. The data driving circuit outputs a gray scale voltage corresponding to the data signal to a pixel unit in the display panel according to the data latch signal.

The utility model provides power supply equipment and load equipment with leakage current compensation, each of which comprises a leakage current compensation circuit, the leakage current compensation circuit is arranged at an output port of the power supply equipment or an input port of the load equipment, and the leakage current compensation circuit comprises a current acquisition module, a voltage acquisition module, a current compensation module and a current acquisition processing module, wherein the current acquisition module and the voltage acquisition module are respectively used for acquiring an initial current signal and an initial voltage signal of an output port of a power supply device or an input port of a load device, the current compensation module is used for receiving and compensating an initial current value according to the initial current signal and the initial voltage signal, generating a compensated current acquisition signal, and outputting the compensated current acquisition signal to the power supply device. And the current collection processing module generates a current control signal for controlling the magnitude of the output current of the power supply equipment or the input current of the load equipment according to the preset current value of the power supply equipment or the load equipment and the compensated current collection signal, so that accurate compensation, collection and control of the current value output by the power supply equipment or the input current of the load equipment are realized.

The invention discloses a multi-modulation-mode power converter and a switching control circuit thereof. The switch control circuit comprises a reset circuit used for generating a reset signal according to a current detection signal representing an inductive current of the power converter and an error signal of a feedback loop of the power converter; the setting circuit is used for generating a setting signal according to the error signal; the RS trigger is used for generating a switch control signal of a switch tube in the power converter according to the reset signal and the set signal; the mode selection circuit is used for comparing the error signal with a switching reference voltage to generate a mode selection signal, and the reset circuit and the setting circuit respond to the mode selection signal to switch internal signal paths respectively, so that the power converter selectively works in one of a PFM mode and a COFT mode. The switch control circuit can adaptively work in one of a PFM mode and a COFT mode according to load conditions, and smooth mode switching can be realized when the COFT mode is switched to the PFM mode.

Disclosed is a linear array scanning Brillouin scattering elastic imaging device. In the device, a signal generating system consists of a narrow linewidth continuous wave laser, a half-wave plate, a beam expander, a Y-direction scanning galvanometer, a microlens array, a pinhole array filter, a first plano-convex lens, a polarization beam splitter, a quarter-wave plate and a microscope objective. A signal receiving system consists of a microscope objective, a quarter-wave plate, a polarization beam splitter and an eight-channel optical collimator array. Each channel of an eight-channel spectrometer consists of an optical collimator, a convex lens, a scanning Fabry-Perot interferometer, a photomultiplier tube and an eight-channel photon collection card.

The invention relates to the technical field of angle measurement, in particular to an angle measurement device. The device comprises a gear transmission mechanism, an angle detection mechanism and two anti-backlash mechanisms, the gear transmission mechanism comprises a driving gear and two follow-up gears; the angle detection mechanism comprises two follow-up end angle sensors. According to the angle measuring device provided by the invention, before the driving gear is started, the two anti-backlash mechanisms apply pre-tightening torques in opposite directions to the two follow-up gears respectively, so that the two follow-up gears are in contact with the left side tooth surface and the right side tooth surface of the driving gear respectively, and then the backlash in the tooth side when the driving gear is started in the forward direction and the reverse direction is eliminated; therefore, a bidirectional transmission preparation state without return stroke errors is realized. Therefore, the problems that due to the fact that a certain gear backlash is reserved between meshing gears, power can be transmitted to the output end only after the gear backlash is eliminated, and time delay and angle deviation are generated on signals detected by an angle sensor are solved.

A nonreciprocal microwave transmission device includes a substrate, a transducer on a surface of the substrate and configured to reciprocally convert between electrical signals to acoustic waves, a first piezoelectric material configured to generates and transports acoustic waves from a signal applied to the transducer, and a thin film magnetic material configured to couple to acoustic waves through magnetoelastic coupling so as to have non-reciprocal magnetoelastic coupled acoustic wave transport. Transmission of acoustic waves through the thin film magnetic material is in a direction toward the transducer has a first magnitude and transmission of acoustic waves through the thin film magnetic material in a direction away from the transducer has a second magnitude, the first and second magnitude being significantly different.

A driving circuit includes a driving signal generation circuit, a gating circuit, an output control circuit, a voltage control circuit and an output circuit; the driving signal generation circuit generates the Nth stage of driving signal; the gating circuit writes a gating input signal into the first node under the control of a gating control signal; the output control circuit connects the first control node and the second node under the control of a potential of the first node; the voltage control circuit controls a potential of the second node according to the potential of the first node; the output circuit connects the output driving terminal and the first voltage terminal under the control of the potential of the second node, and connects the output driving terminal and the second voltage terminal under the control of the potential of the second control node; N is a positive integer.

The invention provides a turn-back type current-limiting protection circuit and a low dropout regulator, and belongs to the technical field of integrated circuits, and the turn-back type current-limiting protection circuit is characterized in that a first sampling resistor outputs a first current according to a sampling signal of a load current, a first bias current and a gated second bias current; the second sampling resistor outputs a second current according to the third bias current and the gated fourth bias current; the current comparison network generates a current comparison signal; the common-source amplification module is connected between an output signal of the error amplifier and a grounding end, on-off of the common-source amplification module is controlled by a current comparison signal and a gated low signal, and an output end of the common-source amplification module is connected with a gate driving module of a power tube; the output signal feedback network generates a gating signal according to the input signal, the output signal and the output signal of the error amplifier. The beneficial effects are that constant load current output is realized by detecting the load current change of the power tube and adjusting the grid voltage of the power tube, and the grid voltage clamp of the power tube is positioned at a safe level by utilizing output voltage feedback, so that turn-back type current limiting protection is realized.

The invention discloses a gallium nitride driving circuit which is used for generating driving voltage for driving a gallium nitride transistor. The circuit comprises a gallium nitride switching tube, an upper switching tube, a lower switching tube, a clamping module, an energy collection module, a diode, a capacitor, a clamping and logic driving module and a bias voltage generation module. The gallium nitride switch tube is connected with the drain electrode of the gallium nitride transistor and clamps the drain electrode voltage to a first voltage; the clamping module receives the first voltage and clamps the first voltage to a second voltage; the energy collection module receives the second voltage and the PWM signal and generates a power supply voltage and a stable voltage. The clamping and logic driving module receives a power supply voltage and a PWM signal and generates a pull-down driving signal. The bias voltage generation module receives the stable voltage and the pull-down driving signal and outputs a bias voltage. When the PWM signal is at a high level, the pull-down driving signal is at a low level, the bias voltage is at a high level, and the driving voltage is at a high level; when the PWM signal is at a low level, the pull-down driving signal is at a high level, the bias voltage is at a low level, and the driving voltage is at a low level.