32results about "Sinusoidal oscillations train generator" patented technology

The invention relates to an electrical stimulation device, an electrical stimulation signal generation method and a readable storage medium. The electrical stimulation device comprises: a control unit for outputting a control signal; the signal generation unit is used for generating a first signal and a second signal according to the control signal; the output unit is used for outputting a first signal and a second signal, the difference value of the first signal and the second signal is smaller than a threshold value, the first signal acts on a first time period of the stimulation period, and the second signal acts on a second time period of the stimulation period. By adopting the method, the problem of user pricking caused by unreasonable waveform design in the stimulation period can be solved.

This invention provides systems, apparatus, methods, and computer programs for RF pulses within pulses for semiconductor radio frequency (RF) plasma processing. [Solution] A method for generating a high-frequency (RF) waveform includes the step of defining an ON-OFF pulse train separated by an OFF state that does not have an ON-OFF pulse. The method further includes the step of generating an RF waveform by applying a multilevel pulse waveform that adjusts the magnitude of each ON-OFF pulse. The method includes the step of sending the RF waveform to an electrode.

The present invention provides a filtering and compensating device for a test transformer, which includes a harmonic detection unit, an instruction current operation unit, a trigger pulse generation unit, and a compensating current generation unit that are electrically connected in sequence; the harmonic detection unit is used to collect the voltage and current signals output by the induction voltage regulator; the instruction current operation unit is used to generate an instruction signal, the trigger pulse generation unit is used to send a pulse drive to the compensating current generation unit; the compensating current generation unit is used to generate a compensating current; the present invention can realize the automatic tracking compensation of the voltage waveform of the induction voltage regulator of the test transformer, effectively limit the high-order harmonics, and make the voltage waveform output by the induction voltage regulator as close to a sine wave as possible. The active filtering and compensation method can also compensate for the capacitive or inductive reactive power during the withstand voltage test, solve the under-compensation or over-compensation phenomenon that occurs when a capacitor or inductor with a fixed capacity is connected in parallel, and improve the capacity utilization rate of the test transformer.

The invention belongs to the technical field of micro-nano plasma switches and radio frequency and power circuits, and particularly relates to a frequency-adjustable high-power pulse signal generation circuit based on a micro-nano plasma switch, which comprises a sinusoidal signal generation module, a tuning module and a micro-nano plasma switch module, the sinusoidal signal generation module comprises an NMOS cross coupling pair, a PMOS cross coupling pair and an LC resonant cavity. The tuning module comprises a capacitor array and a frequency tuning module. A micro-nano plasma switch is used for realizing large-current transmission and is matched with a sine wave signal to generate a specific pulse signal. An inductor and a variable capacitor are introduced into the LC resonant cavity and the frequency tuning unit, and the capacitance value is adjusted by changing the end voltage of the capacitor, so that the circuit outputs a pulse signal of which the frequency covers a low frequency band to a terahertz frequency band under the control of different voltages. The pulse signal generated by the circuit has the characteristics of high power, picosecond-level rising edge and different repetition frequencies, and is suitable for terahertz communication, radar and other systems.

A system and method for generating a radio frequency (RF) waveform are described. The method includes defining a train of on-off pulses separated by an off state having no on-off pulses. The method further includes applying a multi-level pulse waveform that adjusts a magnitude of each of the on-off pulses to generate an RF waveform. The method includes sending the RF waveform to an electrode.

The embodiment of the utility model discloses a technical scheme, and provides a sine wave generating circuit which generates PWM signals through an amplification function circuit 11 formed by a PWM controller U1 and control function circuits 12 (U2A and U2B), and then converts the PWM signals into smooth sine waves through LC filtering function circuits L1 and C2-C6 to output. The whole circuit controls the amplitude and frequency of the output sine wave by adjusting the duty ratio of the PWM signal, and is suitable for an application scene needing to stabilize the sine wave signal. Compared with a traditional sine wave generating circuit (an amplifying circuit, a positive feedback network, a frequency selecting network, a radiation stabilizing circuit and the like), the sine wave generating circuit provided by the utility model is simpler in circuit structure and lower in price.

A power factor correction (PFC) controller for a PFC switching power supply is disclosed. The PFC controller includes an AC sense terminal, a DC sense terminal, and a reference signal generator coupled to the AC sense terminal. The reference signal generator is configured to receive a divided reference signal generated based on a modified version of an AC input signal and generate a synthesized reference signal using information indicative of an amplitude and a frequency of the divided reference signal. The reference signal generator is further configured to select one of the divided and synthesized reference signals as an output reference signal based on a current amplitude of the divided reference signal. The PFC controller is configured to, based on the output reference signal and a DC voltage sensed on the DC sense terminal, regulate output power provided to a downstream power converter coupled to the PFC switching power supply.

The invention aims to provide a system and a method for generating a three-phase horn modulated wave from a three-phase sinusoidal modulated wave. The system comprises a three-path multiplier (1), an amplitude conversion module (2), a first summation module (3), a channel selection module (4), a second summation module (5) and a third summation module (6). The method comprises the following steps: a, generating an original sine wave signal by using a sine modulation wave generation system; b, performing equal amplitude transformation on the three-phase original sine wave signal by using an amplitude transformation module 2 to obtain a synthetic amplitude Uamp of the three-phase original signal; c, setting a proportionality coefficient Coe, and rectifying the original sine wave signal by using a multiplier (1); d, obtaining the content Ucom of the injected original signal by using a second summation module (5); and e, superposing the original sine wave signal and the content Ucom of the injected original signal obtained in the step d to obtain a horn modulation wave signal. The invention is applied to the technical field of power electronics.

The invention discloses a signal simulator for a nuclear power station loose component monitoring system, and relates to the technical field of nuclear power station equipment monitoring, a man-machine interaction module receives signal parameters of an impact signal to be simulated by the signal simulator, and a controller controls a signal generation module to generate the signal parameters, the method comprises the following steps: generating a sine wave basic signal with a frequency corresponding to a signal parameter through a direct digital frequency synthesizer, converting the sine wave basic signal into an impact pulse with a width corresponding to the signal parameter through a pulse forming network, and carrying out frequency spectrum shaping on the impact pulse through a filter corresponding to the material of a to-be-simulated loose component. And finally, the impact pulse after frequency spectrum shaping is adjusted to an amplitude corresponding to a signal parameter through a gain amplification circuit, and a simulated impact signal is obtained. According to the invention, different signal characteristics of the impact signal generated by the impact of the loose part can be simulated from multiple angles, and the simulation precision of the impact signal generated by the impact of the loose part is improved.

The application relates to a resolver sensor signal simulation circuit. The application comprises a differential amplification circuit, a sine signal conversion circuit, a cosine signal conversion circuit, a first transformer isolation circuit and a second transformer isolation circuit. The excitation signal output end of an external controller is connected with the input end of the differential amplification circuit. The first input end of the sine signal conversion circuit and the first input end of the cosine signal conversion circuit are both connected with the output end of the differential amplification circuit. The second input end of the sine signal conversion circuit and the second input end of the cosine signal conversion circuit are both connected with the external control signal output end. The external control signal output end is used for outputting an external control signal. The output end of the sine signal conversion circuit is connected with the sine signal input end of the external controller through the first transformer isolation circuit. The output end of the cosine signal conversion circuit is connected with the cosine signal input end of the external controller through the second transformer isolation circuit. The application has the advantages of simple implementation and strong anti-interference performance.

A device comprises a radio frequency signal generator (100) which comprises a first signal path, a second signal path, a signal combiner (130), and a quadrature mixer (140). The first signal path is configured to generate an analog pulse (P1). The second signal path is configured to generate a delayed analog pulse (P2). The signal combiner is configured to combine the analog pulse and the delayed analog pulse to generate an analog compensation pulse (P3). The quadrature mixer is configured to utilize the analog pulse and the analog compensation pulse to modulate quadrature local oscillator signals and generate a radio frequency control signal (RF_OUT). The radio frequency control signal comprises a frequency that corresponds to a frequency of the quadrature local oscillator signals, and a pulse shape which comprises a shape of the analog pulse modified by a shape of the analog compensation pulse.

A novel adjustable light-operated memristive circuit belongs to the technical field of circuit design and is specifically provided with a magnetic signal generating circuit, an index signal generating circuit and a signal processing circuit, the input end of the magnetic signal generating circuit is connected with input voltage, the magnetic signal generating circuit is connected with a photoresistor, and the photoresistor is connected with the index signal generating circuit. The output end of the magnetic signal generating circuit is connected with the input end of the signal processing circuit through the index signal generating circuit. The beneficial effects are that the photoresistor is connected to the magnetic signal generation circuit, so that the circuit model can maintain the resistance state during power failure, and the resistance value can be changed according to illumination during power-on. Besides, the input charge state is regulated and controlled through the photoresistor, and the circuit resistance can change along with the charge quantity, so that different memristor hysteresis loop models are simulated, and meanwhile, a hysteresis loop simulation curve can be finely adjusted. The model not only improves the simulation precision of the memristor model, but also provides a new thought for optimizing the performance of the memristor in practical application.

A power factor correction (PFC) controller for a PFC switching power supply is disclosed. The PFC controller includes an AC sense terminal, a DC sense terminal, and a reference signal generator coupled to the AC sense terminal. The reference signal generator is configured to receive a divided reference signal generated based on a modified version of an AC input signal and generate a synthesized reference signal using information indicative of an amplitude and a frequency of the divided reference signal. The reference signal generator is further configured to select one of the divided and synthesized reference signals as an output reference signal based on a current amplitude of the divided reference signal. The PFC controller is configured to, based on the output reference signal and a DC voltage sensed on the DC sense terminal, regulate output power provided to a downstream power converter coupled to the PFC switching power supply.

The utility model relates to the technical field of beauty instruments, and discloses a function multiplexing pulse signal output circuit and a beauty instrument, and the circuit comprises a rectangular pulse signal generation module which is used for generating a rectangular pulse signal; the rectangular pulse signal shaping module is used for converting the rectangular pulse signal into a positive and negative symmetric rectangular pulse signal; the first function control module is used for outputting positive and negative symmetric rectangular pulse signals to the first metal electrode; the second function control module is used for converting the positive and negative symmetrical rectangular pulse signals into sine pulse signals and outputting the sine pulse signals to the second metal electrode; and the control module is used for conducting the rectangular pulse signal generation module, the rectangular pulse signal shaping module and the first function control module to execute a leading-in function, or conducting the rectangular pulse signal generation module, the rectangular pulse signal shaping module and the second function control module to execute a micro-current function. Function multiplexing of the beauty instrument can be realized based on the same circuit, the circuit composition is simplified, and the cost is reduced.

The application provides a power waveform generator with a four-quadrant feedback loop and a control method thereof. The generator is controlled by a user through a host computer and a graphical interface to output a first control signal and a second control signal. The first control signal is input to an FPGA+ARM main control board, parsed into secondary instructions and sent to an auxiliary FPGA, and then used to control a digital-to-analog converter to generate a digital-to-analog converted signal and output the signal to a four-quadrant analog feedback loop to generate an arbitrary waveform signal. The second control signal is directly used to control a bias adjustment circuit to output a suitable bias signal to the four-quadrant analog feedback loop. The four-quadrant analog feedback loop superimposes and processes the received signal to output a voltage and current signal to a bit number expansion circuit, and further drives an operational amplifier bootstrap network to generate a voltage drive waveform, and then generates an arbitrary-shaped power waveform through a push-pull output network.

The application discloses a high-voltage energy storage battery cluster impedance spectrum excitation power generation method and system, and aims to solve the problem of unreasonable design of an existing excitation power generation system architecture, and the problem of fluctuation caused by superposition of alternating current excitation and direct current. The system comprises an energy storage battery cluster, a parallel bidirectional DC / DC converter, a power conversion system and a core control module. The energy storage battery cluster comprises a plurality of energy storage battery monomers. One end of the parallel bidirectional DC / DC converter is connected with the energy storage battery cluster, and the other end is connected with the power conversion system, and the parallel bidirectional DC / DC converter is used for bidirectional transmission of energy between the energy storage battery cluster and the power conversion system. The power conversion system is used for maintaining constant voltage operation of the system. The core control module is used for calculating and generating a modulation signal according to a sine reference excitation signal and circuit sampling data through a double-current loop closed-loop control strategy, so that the parallel bidirectional DC / DC converter controls the state of corresponding power switches based on the modulation signal, and sine excitation power generation is realized. The sine excitation signal generated through the system is more stable and accurate.

To provide a system and method for generating radio frequency (RF) pulse waveforms within a pulse for semiconductor RF plasma processing.SOLUTION: A method for generating pulses within a pulsed signal using a matchless RF source comprises: a step for defining an ON-OFF pulse train separated by an OFF state with no ON-OFF pulse; a step for generating RF waveforms by applying a multi-level pulse waveform that adjusts the magnitude of each of the ON-OFF pulses; and a step for delivering RF waveforms to electrodes.SELECTED DRAWING: Figure 9

The invention relates to the technical field of thermal imaging nondestructive testing, and discloses an excitation source device and method for a thermal imaging nondestructive testing system. The device comprises a controller, a driving circuit, a sine wave generating circuit, a square wave generating circuit, an MOS tube coupling noise suppression circuit and a halogen lamp load. The controller is used for generating an SPWM signal and a PWM signal; the driving circuit is used for receiving and adjusting the SPWM signal and the PWM signal; the sine wave generating circuit receives the SPWM signal and outputs sine wave; the square wave generating circuit receives the PWM signal and outputs a square wave; the MOS tube coupling noise suppression circuit is used for suppressing gate-source coupling noise generated in the switching process; the requirements of the thermal imaging nondestructive testing system for excitation intensity, excitation mode and excitation frequency range are met.

The invention relates to a reference sine wave generator for a PFC controller. A power factor correction (PFC) controller for a PFC switching power supply is disclosed. The PFC controller includes an AC sense terminal, a DC sense terminal, and a reference signal generator coupled to the AC sense terminal. The reference signal generator is configured to receive a divided voltage reference signal generated based on a modified version of the AC input signal, and to generate a synthetic reference signal using information indicative of an amplitude and a frequency of the divided voltage reference signal. The reference signal generator is further configured to select one of the divided voltage reference signal and the synthesized reference signal as an output reference signal based on a current amplitude of the divided voltage reference signal. The PFC controller is configured to regulate an output power provided to a downstream power converter coupled to the PFC switching power supply based on the output reference signal and a DC voltage sensed on the DC sensing terminal.

This application discloses a sine wave generation circuit and an electronic device. The sine wave generation circuit includes a first signal conversion module, a Class D amplifier, a second signal conversion module, and a voltage control module. The first signal conversion module converts a square wave signal into a first sine wave signal with adjustable amplitude. The Class D amplifier amplifies and modulates the power of the first sine wave signal, and then outputs a high-frequency carrier pulse-width modulated signal. The second signal conversion module demodulates and boosts the high-frequency carrier pulse-width modulated signal to output a second sine wave signal. The voltage control module outputs an adjustment signal to the first signal conversion module to adjust the amplitude of the first sine wave signal based on the control signal and the second sine wave signal until the voltages of the control signal and the second sine wave signal satisfy a preset relationship. This method allows for the output of a corresponding sine wave signal according to user needs, and is highly reliable due to its high conversion efficiency.

A novel adjustable light-operated memristor processing circuit is provided with a signal source circuit, the input end of the signal source circuit is connected with input voltage, the signal source circuit is connected with a photoresistor, and the output end of the signal source circuit is connected with the input end of an index signal generating circuit; the output end of the exponential signal generation circuit is connected with the input ends of the first fractional circuit, the hyperbolic sine signal generation circuit and the hyperbolic cosine signal generation circuit; the output end of the first fractional circuit is connected with the input ends of the hyperbolic sine signal generation circuit and the hyperbolic cosine signal generation circuit; the output end of the hyperbolic cosine signal generation circuit is connected with the input ends of the second fractional circuit and the output multiplier; the output end of the hyperbolic sinusoidal signal generation circuit is connected with the input ends of the second fractional circuit and the output multiplier; the output end of the second fractional circuit is connected with the input end of the output multiplier, and the input end of the output multiplier is further connected with input voltage. The multi-dimensional signal processing circuit has the advantages that multi-dimensional processing of input signals can be achieved through the same circuit.

A sine wave generation circuit includes: a first direct digital synthesizer generating a digital sine wave fundamental signal having a frequency f0 in a normal operation mode and a calibration mode; a second direct digital synthesizer generating a digital second harmonic correction signal having a frequency 2f0 in the normal operation mode; a correction circuit superimposing the digital second harmonic correction signal on the digital sine wave fundamental signal; a D / A converter converting an output of the correction circuit into an analog sine wave signal; an output buffer receiving the analog sine wave signal and outputting an analog sine wave output signal; an A / D converter converting the analog sine wave output signal into a digital signal in the calibration mode; and a processing circuit generating a spectrum based on the digital signal in the calibration mode and setting a parameter of the second direct digital synthesizer based on the spectrum.

The present application relates to the technical field of encoder calibration, and especially relates to an encoder calibration circuit, a calibration method and an integrated circuit chip. The circuit comprises: an input end of an analog signal comparison circuit is connected with a signal source and a reference signal output end of a processor respectively, which is used for comparing the size of a reference signal output by the processor and an original sine signal output by the signal source, and outputting a first comparison result through an output end; and comparing the size of the reference signal and an original cosine signal output by the signal source, and outputting a second comparison result through the output end; the processor acquires the first comparison result and the second comparison result, and outputs a first difference value between an original sine signal offset and an original cosine signal offset to an offset adjustment circuit; the offset adjustment circuit adjusts the offset of the original sine signal and the original cosine signal based on the first difference value, and outputs the sine signal after offset adjustment and the cosine signal after offset adjustment.

The invention provides a power amplifier driving circuit, a radio frequency power supply and semiconductor process equipment. In the power amplifier driving circuit, an output signal of a driving module is detected through a detection module, and a control signal is generated according to the output signal, so that the driving module switches the state according to the control signal, and the situation that when the output signal of the driving module is abnormal, a switching element in a power amplifier module is mistakenly conducted is avoided; therefore, safe and efficient work of the driving module and the power amplifier module is realized; besides, the driving module and the power amplifier module are used for amplifying the radio frequency signal generated by the control module twice, so that the maximum power range of the output of the radio frequency power supply is enlarged, the application scene of the radio frequency power supply is enriched, and the radio frequency power supply has better practical value.

A method for acquiring the average phase of sine wave signals with the same frequency comprises the following steps of: performing synchronous reverse phase shift on sine wave signals A and B with the same frequency, namely reducing a phase shift angle theta for A and increasing the phase shift angle theta for B; and when the amplitude of a direct-current signal output after the formed sine wave signal An and the sine wave signal Bn are subjected to frequency mixing and filtering by the accumulated phase shift value theta n, determining that the coincident phase of the two mixed signals is the average value of the phases of the two signals A and B. The problem of poor signal-to-noise ratio caused by small signal and large noise of a sum frequency signal can be avoided; therefore, the signal-to-noise ratio of the average phase signal can be improved, and the average phase signal with better performance can be obtained.

The invention discloses a modular root apex locator signal conditioning circuit, which comprises a main controller, an excitation signal input port and a signal conditioning module, and is characterized in that the excitation signal input port is suitable for receiving a first excitation signal generated by the main controller; the signal conditioning module comprises a single-ended to differential circuit, an attenuation circuit and a root canal measurement output port; the single-ended to differential circuit is electrically connected with the excitation signal input port, and the single-ended to differential circuit is suitable for converting a first excitation signal input from the excitation signal input port into a differential form from a single-ended form so as to form a second excitation signal; the attenuation circuit is electrically connected with the single-ended to differential circuit, and the attenuation circuit is suitable for performing attenuation processing on the second excitation signal which is converted into the differential form so as to form a third excitation signal; the signal processing flow can be simplified, the consistency of measurement results is improved, and the maintenance cost is reduced through modular design.

The application belongs to the technical field of power supply, and particularly relates to a power supply output mode adjusting circuit based on a load state, which comprises a voltage division sub-circuit, an input signal of an input end of the voltage division sub-circuit being a sine signal, and an output signal of an output end of the voltage division sub-circuit being a chord signal with a certain angle difference from the sine signal; two-stage low-pass filter sub-circuits, an input signal of an input end of the two-stage low-pass filter sub-circuits being the sine signal, and an output of an output end of the two-stage low-pass filter sub-circuits being a quadrature signal; a multiplier, an X input end of the multiplier inputting the quadrature signal, a Y input end of the multiplier inputting the chord signal, and an output end of the multiplier outputting a voltage related to the phase difference; a comparator COMP1B, an input of a positive input end of the comparator COMP1B being the voltage, an input of a negative input end of the comparator COMP1B being a reference voltage Vref2, and an output end of the comparator COMP1B outputting a control signal, the control signal being used for controlling a feedback mode of a switching power supply. The circuit has the advantage of strong adaptability, can adjust the power supply output mode according to the load state, and improves the flexibility of the power supply output mode adjustment.

A device comprises a radio frequency signal generator which comprises a first signal path, a second signal path, a signal combiner, and a quadrature mixer. The first signal path is configured to generate an analog pulse. The second signal path is configured to generate a delayed analog pulse. The signal combiner is configured to combine the analog pulse and the delayed analog pulse to generate an analog compensation pulse. The quadrature mixer is configured to utilize the analog pulse and the analog compensation pulse to modulate quadrature local oscillator signals and generate a radio frequency control signal. The radio frequency control signal comprises a frequency that corresponds to a frequency of the quadrature local oscillator signals, and a pulse shape which comprises a shape of the analog pulse modified by a shape of the analog compensation pulse.

The invention relates to the technical field of medical apparatus and instruments, and provides phase-synchronous electromagnetic combined transcranial stimulation equipment, which comprises a time interference electrical stimulation module, an envelope detector module, a zero-cross detection module, a square-wave generator and a repeated transcranial magnetic stimulation module which are connected in sequence, the time interference electrical stimulation module and the repeated transcranial magnetic stimulation module are connected with a stimulation object; the time interference electrical stimulation module performs electrical stimulation on a stimulated object and generates a difference frequency electrical signal, and the envelope detector module converts the difference frequency electrical signal generated by the time interference electrical stimulation module into a sine wave. The zero-cross detection module drives the square wave generator through sine waves to generate double-path square wave signals, the double-path square wave signals are transmitted to the repeated transcranial magnetic stimulation module through the first square wave output end and the second square wave output end, and magnetic stimulation with the same phase is carried out on a stimulated object through the repeated transcranial magnetic stimulation module. According to the invention, transcranial electrical stimulation and transcranial magnetic stimulation with the same phase can be provided.

Disclosed are a method and an apparatus for generating a qubit control signal, wherein a main pulse and a DRAG pulse used to control a superconducting quantum computer are generated with low power and without a memory. The method comprises the steps of: generating a first sine curve having a first phase obtained by multiplying an angular velocity by a predetermined time of each period, the angular velocity being obtained by adding a first angular velocity of a center frequency and a second angular velocity at a predetermined time of each period; and generating a second sine curve having a second phase obtained by multiplying an angular velocity by a predetermined time, the angular velocity being obtained by subtracting the second angular velocity from the first angular velocity. The DRAG pulse is generated through an operation of adding the first sine curve and the second sine curve.