136 results about "Pulse circuits" patented technology

The present invention discloses a pulse generator and a pulse rod, which relate to the field of pulse circuit technology. The pulse generator includes a frequency control unit, a dual closed-loop pulse amplification unit, a digital signal processing unit and an adaptive power management unit. The frequency control unit includes an environmental sensor and a microcontroller. The microcontroller can calculate a preset pulse frequency based on information transmitted by the environmental sensor. The input end of the dual closed-loop pulse amplification unit can receive a pulse signal transmitted by the microcontroller, amplify it to a preset pulse frequency, and provide a pulse current to an electrostatic elimination needle. The digital signal processing unit can digitize the pulse signal to enhance the anti-interference ability of the pulse signal. The adaptive power management unit includes a dynamic voltage regulation module electrically connected to an external power supply, and the dynamic voltage regulation module can dynamically adjust the output voltage. The technical solution provided by the present invention can provide a pulse generator with high stability, a wide adjustment range and strong anti-interference ability.

The invention provides a power device pin parasitic inductance measuring circuit and electronic equipment. The measuring circuit is characterized in that a measured power device is connected between the output end of a double-pulse circuit and the ground; the measuring circuit comprises a double-pulse circuit, and the double-pulse circuit is used for outputting a changing current signal to the measured power device under the driving of the first pulse signal and the second pulse signal. According to the measuring circuit, the power device measuring assembly is connected between the lower tube of the double-pulse circuit and the negative electrode of the direct-current power supply, so that the parasitic inductance of the pin of the measured power device can be accurately measured.

The invention discloses a current-to-voltage conversion circuit structure for electroporation delivery. The current-to-voltage conversion circuit structure comprises a current-to-voltage conversion circuit and a voltage-to-pulse conversion circuit. The current-to-voltage circuit converts current signals into voltage through an input signal processing module, high-precision amplification is achieved through an operational amplifier and a feedback network of a signal amplification module, the driving capacity is enhanced through a transistor cascade circuit, and temperature drift is dynamically compensated in combination with a thermistor. The voltage-to-pulse circuit corrects non-linear errors through a resistance network of the linearization processing module, achieves gain adjustment through an operational amplifier and an adjustable resistor, and finally adapts to load changes through a field effect transistor and a negative feedback network. The circuit realizes high conversion precision, wide temperature range stability and load adaptive capability, and is suitable for high-precision scenes such as medical treatment or beauty electroporation, industrial sensing and the like.

The invention belongs to the technical field of power electronics and semiconductor devices, and provides a transistor on-resistance high-precision comparison method, which comprises the following steps of: generating and outputting a direct-current voltage # imgabs0 # which can quickly adjust a numerical value and has load capacity through a direct-current voltage adjusting module; the grid driving module generates and outputs a pulse signal # imgabs3 # of which the voltage can be quickly adjusted based on the direct-current voltage # imgabs1 # and the pulse voltage # imgabs2 #; applying a pulse signal # imgabs4 # to the transistor to be measured through the power module, and measuring the on-resistance of the transistor to be measured under the gate driving voltage; and switching the gate driving voltage in the microsecond-to-nanosecond magnitude delay, and measuring the on-resistance of the transistor to be measured under the switching gate driving voltage based on the pulse signal # imgabs5 #. According to the method, the on-resistance of the transistor to be tested under different gate driving voltages can be tested in the pulse circuit, the measurement delay is shortened to several nanoseconds from several minutes of a traditional double-pulse circuit, and the performance of the transistor reliability evaluation circuit is effectively improved.

The invention provides a double-phase pulse circuit and a high-frequency pulse therapeutic apparatus, and relates to the technical field of medical instruments, and the double-phase pulse circuit comprises a booster circuit, N groups of pulse modulation isolation transformation circuits, an amplitude-limiting current-limiting circuit, a cascade circuit, a double-phase wave modulation circuit and a main controller, the boost circuit performs pulse modulation and boost processing on the output DC voltage of the target DC power supply to obtain an initial pulse voltage signal; n groups of pulse modulation isolation transformation circuits respectively perform isolation boosting processing on the initial pulse voltage signals to obtain N high-voltage pulse signals; the amplitude-limiting current-limiting circuit performs amplitude-limiting current-limiting processing on the N high-voltage pulse signals to obtain N high-voltage square-wave pulse signals; performing cascade processing on the N high-voltage square-wave pulse signals to obtain a target square-wave pulse signal; and performing dual-phase modulation on the target square wave pulse signal to obtain a target dual-phase pulse signal. According to the technical scheme, the effect of improving the safety of the double-phase pulse circuit is achieved.

The invention discloses a CFD-DEM-based dense charging bed particle distribution calculation method under the action of plasma jet, and the method comprises the steps: employing a zero-dimensional mathematical physical model which comprises pulse circuit discharge, capillary ablation and plasma jet and generates plasma through capillary ablation; obtaining a curve fitting formula of the plasma jet temperature and pressure changing along with time; acquiring initial information of the dense charging bed; establishing a dense charging bed geometric model, setting geometric dimension parameters of the dense charging bed model, performing grid division, and establishing a dense charging bed plasma jet point fire transfer model in a CFD solver; establishing a particle model in a DEM solver; and coupling Fluent and Edem calculation software, carrying out transient calculation solution, and synchronously carrying out numerical calculation on the CFD solver to obtain simulation result data. According to the method, the instantaneous speed distribution of the particles moving in the medicine chamber and the final accumulation condition of the particles in the medicine chamber can be obtained.

Provided are a wireless ultrasound probe and a control method thereof, and in particular, a wireless ultrasound probe and a control method thereof, the wireless ultrasound probe including a battery circuit, a switching circuit, a pulse circuit, a transducer, a capacitor, and a discharge module, wherein the switching circuit is configured to generate a high voltage used by the pulse circuit to output a transmission signal and store the high voltage in the capacitor, and the discharge module is configured to detect whether a first event has occurred that causes damage to the wireless ultrasound probe due to the high voltage stored in the capacitor, and in response to detecting the first event, start a discharge operation for discharging the high voltage stored in the capacitor.

A system for protecting a MEMS relay switch system that controls electric current to a load includes a parallel resonant circuit in series with the MEMS relay switch system. The parallel resonant circuit includes an auxiliary switch in series with a capacitor configured to be pre-charged by a voltage source, and an inductor in parallel with the auxiliary switch and the capacitor. The inductor is in series with the MEMS relay switch system. A method includes receiving a signal, activating an auxiliary switch, determining if the received signal is a turn OFF or a turn ON signal, and depending on the received signal, setting a time delay within a resonant half cycle of a parallel resonant pulse circuit, turning off the auxiliary switch, and pre-charging a capacitor of the parallel resonant pulse circuit.

The utility model belongs to the field of brain rehabilitation auxiliary equipment, and particularly relates to a head-mounted transcranial magnetic stimulation device which comprises an annular head band, a fixing rod is arranged in the annular head band, a plurality of electromagnetic blocks are distributed and installed on the fixing rod, and an electroencephalogram detection module, a composite detection module and a main control box are further installed on the fixing rod. The composite detection module is installed on the portion, aligned with the temples, of the fixing rod, a communication module, a controller, a battery and a pulse circuit adjusting module are arranged in the main control box, the blood oxygen detection module, the communication module and the pulse circuit adjusting module are all electrically connected with the controller, and the electromagnetic block is electrically connected with the pulse circuit adjusting module. When the head-mounted transcranial magnetic stimulation device is used, the upper computer monitors whether the physiological indexes are normal or not through software, the transmitting power and frequency of the electromagnetic block are adjusted in time, side effects caused by the fact that a patient receives too strong electromagnetic waves for a long time are avoided, and the head-mounted transcranial magnetic stimulation device has the advantages of being easy to operate, safe to use and small in side effects.

The invention describes a driver circuit for supplying a constant current to an LED arrangement (LED1... LEDN) formed by a buck converter comprising a current measurement resistor (Rsense) in series with a coil (Lbk) that measures the current through the coil (Lbk). A two-point control circuit turns on or off the first switching element (Qh) as a function of a measured current (Vsense) flowing through the coil (Lbk) in order to keep the average current flowing through the LED arrangement (LED1... LEDN) constant. A current amplifier circuit (A sense) is connected to a current measurement resistor (R sense) to detect a current (V sense) flowing through the current measurement resistor, and positive and negative currents can be measured by superimposing an offset voltage (V offset) applied to one of its inputs by an offset voltage source. An output terminal of the current amplifier circuit is connected to an input terminal of the two-point control circuit. The offset voltage (V offset) is also superimposed on its threshold voltage (V peak, V valley). Furthermore, a start-up pulse circuit (Vstart-up) is provided, which is connected to the control input of the first switching element (Qhs) via a diode (Dstart-up).

The utility model discloses an active clamping forward switching power supply with dead zone control. The active clamping forward switching power supply comprises a minimum pulse circuit, a dead zone setting circuit, a signal interlocking circuit and an active clamping forward switching circuit, the minimum pulse circuit, the dead zone setting circuit and the signal interlocking circuit are connected in sequence; the active clamping forward switching circuit comprises a transformer T1, the two ends of a primary side winding of the transformer T1 are connected with a clamping absorption circuit in parallel, a primary side negative electrode of the transformer is connected with a main power circuit, and the clamping absorption circuit and the main power circuit are connected with a signal interlocking circuit. The circuit can flexibly set dead time to avoid circuit failure caused by direct connection of a clamping tube and a main power switch tube, input signal burrs can be eliminated, mistaken switching-on caused by the signal burrs can be avoided, one path of PWM can be converted into two paths of PWM output, and the number of external equipment is reduced.

The invention discloses a high-voltage pulse generation circuit based on a front boost structure, a working method and application, and belongs to the field of high-voltage pulse power supplies, the high-voltage pulse generation circuit comprises a direct-current power supply, a front Sepic boost circuit and a pulse forming module which are connected in sequence, and the pulse forming module comprises a plurality of cascaded Marx high-voltage pulse circuits. Therefore, the direct-current power supply is boosted by the aid of the front Sepic booster circuit, boosted electric energy is transmitted to the pulse forming module, and high-voltage pulses are formed on a load by the aid of parallel charge pump voltage and series discharge of the Marx high-voltage pulse circuit. By adopting the high-voltage pulse generation circuit based on the pre-boost structure, the working method and the application, a traditional Marx circuit is optimized through the Sepic boost converter, the voltage gain is improved, the number and cost of devices are reduced, the voltage stress of the devices is reduced, the system efficiency is improved, the power density is increased, the reliability is improved, and the service life of the circuit is prolonged.

The nanosecond narrow pulse circuit comprises a nanosecond narrow pulse signal generation circuit and a signal driving enhancement circuit, an external trigger signal respectively passes through a first buffer and a second buffer of the nanosecond narrow pulse signal generation circuit to obtain two paths of same signals, a second resistor of the second RC time delay circuit is a digital potentiometer, the pulse width of signals can be set by changing the resistance value of the digital potentiometer, narrow pulse signals are obtained after two paths of same signals pass through a first AND gate, and narrow pulse signals with opposite phases and high driving capacity are obtained after the narrow pulse signals are input into a gate driving chip. And when the signal output by the gate driving chip is low level, the bias voltage, the current-limiting resistor and the light emitting diode form a current loop through the gate driving chip, and the light emitting diode is excited to emit light. The technical problems that an existing scheme for achieving a second narrow pulse laser is high in cost, difficult to be suitable for batch production and low in reliability are solved.

This invention relates to the field of pulse circuit technology and discloses a high-efficiency AC power line zero-crossing detection chip, including a path selection module, a signal processing module, and a driving module. The path selection module switches the charging circuit according to the potential of the internal power supply capacitor. The signal processing module uses a feedback loop to adjust the switching level of the sampling branch and generate a zero-crossing trigger pulse signal. The driving module responds to the zero-crossing trigger pulse signal by segmentally turning on the internal power supply capacitor and the external energy supply capacitor in the initial and subsequent stages of the zero-crossing point. This invention solves the contradiction between the ultra-high input impedance sampling environment and the driving strength through a controlled hysteresis window and a segmented current injection mechanism, suppresses signal jitter, improves the timing accuracy of zero-crossing detection, and effectively reduces the static power consumption of the system.

The invention discloses a high-voltage electric pulse synergistic acidizing fracturing coal seam anti-reflection device and method.The high-voltage electric pulse synergistic acidizing fracturing coal seam anti-reflection device comprises a hole packer, the hole packer comprises a high-pressure acid injection pipeline, the middle of the high-pressure acid injection pipeline is sleeved with an expansion capsule, the two ends of the expansion capsule are each provided with a fixing end, and a connecting pipe is arranged at the rear end of the high-pressure acid injection pipeline; each high-voltage electrode comprises a high-voltage electrode A section and a high-voltage electrode B section, mounting holes are formed in the two sides of the fixed end at the front end in the radial direction, springs are fixedly arranged at the bottoms in the mounting holes, the two high-voltage electrode A sections penetrate through the expansion capsule, and the front ends of the two high-voltage electrode A sections abut against the high-voltage electrode B sections to achieve electric connection. And the rear end of the high-voltage electrode section A is connected with the pulse circuit. Mineral substances can be corroded through the acidizing fracturing fluid, a coal seam hole fracture network can be dredged, the subsequent high-voltage electric pulse discharging difficulty is reduced, then high-voltage electric pulse discharging is carried out for fracturing, and the coal rock fracturing efficiency is guaranteed.

The invention relates to the field of pulse circuit and input and output interface control, in particular to a printer USB (Universal Serial Bus) insertion detection method and equipment based on a dual delay mechanism. The method comprises the following steps: performing term registration and dual delay window arrangement by acquiring signals such as a USB insertion trigger level, and constructing a configurable sequential relationship; executing charging and discharging sequence starting and delay endurance processing, and generating an ordered expiration mark sequence; sampling for the first time and sampling for the second time based on the sequence, and constructing a judgment result through consistency comparison; and finally, completing power supply latching, enumeration configuration and state filing according to a judgment result. According to the invention, the anti-interference capability and reliability of insertion detection are effectively improved, and structured management and full-link auditing in the detection process are realized.

Disclosed are a drive circuit, a light-emitting circuit and a display device. The drive circuit is connected to a load element. The drive circuit includes a switch power supply circuit for boosting or reducing a first voltage; a feedback circuit for receiving a feedback voltage of the load element, and generating a control signal in response that the feedback voltage is not within a preset voltage range; a pulse circuit for generating a switch signal with a first preset frequency; and a switch circuit. The switch circuit is for transmitting the control signal to the control end of the switch tube in response to receiving the control signal, and the switch circuit is for transmitting the switch signal to the control end of the switch tube in response to not receiving the control signal.

A system including an asynchronous finite state machine that transitions from a first state to a second state in response to receiving a virtual-clock event signal. The system further includes a trigger circuit that asserts a trigger signal when a first-state asynchronous event signal is asserted while the asynchronous finite state machine is in the first state. The system further including a virtual clock-pulse circuit configured to generate the virtual-clock event signal after receiving the trigger signal.

This invention relates to the field of voltage regulator circuit technology, specifically disclosing a thyristor gate trigger circuit, including AC input terminals Uin1 and Uin2, sampling input terminals Uin3 and Uin4, AC output terminals Uout1 and Uout2, operational amplifiers N1 and N2, a rectifier-filter voltage regulator circuit, a current-limiting pulse circuit, a synchronization signal phase-shifting circuit for adjusting the phase angle of the output pulse signal, and a phase-shifting trigger circuit. The AC input terminals Uin1 and Uin2 are synchronization signals. This invention acquires the voltage value at the output terminal of the thyristor voltage regulator circuit in real time, and adjusts the phase of the output pulse to the thyristor gate according to the magnitude of the sampled voltage value. The thyristor adapts to the phase angle of the trigger pulse, thereby achieving voltage regulation in the thyristor voltage regulator circuit. This embodiment of the thyristor gate trigger circuit has the technical effects of high pulse sensitivity and strong stability.

This invention relates to the field of high-resolution time measurement systems and integrated circuit technology, providing a time measurement circuit with a two-dimensional address-modulated TOT pulse, comprising: a common-gate transimpedance amplifier, a high-speed high-gain comparator, a current-mode logic output stage, a common-mode feedback threshold setting circuit, and a two-dimensional address-modulated TOT pulse circuit; the address modulation pulse circuit includes an address modulation pulse width circuit and an address modulation pulse amplitude circuit, wherein the address modulation pulse width circuit includes: multiple sets of first modulation units, multiple sets of second modulation units, multiple inverters, and multiple bits of first digital code; the address modulation pulse amplitude circuit includes: multiple sets of third modulation units and multiple bits of second digital code. This invention allows a single TOT signal to simultaneously carry time information, energy information, and address information, reducing wiring, improving reliability, and increasing integration density.

The invention belongs to the technical field of pulse power, and particularly discloses a frequency superposition pulse circuit based on an avalanche transistor, a generator and a control method. According to the frequency superposition pulse circuit, the frequency superposition pulse circuit is composed of the multiple pulse units, the finally output repetition frequency pulse is composed of the outputs of the multiple pulse units, superposition on the frequency is achieved, and the pulse repetition frequency can be improved while the pulse amplitude can be effectively guaranteed. The pulse repetition frequency of a single pulse unit can be effectively reduced while the purpose of high repetition frequency output is achieved, the problem that the repetition frequency of output pulses of a single Marx circuit based on an avalanche transistor is insufficient is solved, meanwhile, the problem that the avalanche transistor and a resistor in the single pulse unit generate heat under high repetition frequency pulses can be effectively relieved, and the pulse repetition frequency of the single pulse unit can be effectively reduced. And thermal damage of the device under high repetition frequency pulses is avoided. The n isolation diodes in the same pulse unit are connected in series, so that the output end of the whole pulse unit generates high voltage, an isolation effect is achieved, and false triggering of m pulse units is avoided.

The invention discloses a pulse circuit for a distributed optical fiber temperature measurement laser device and a temperature measurement device, the pulse circuit is provided with a power supply unit, a central processing unit and a pulse signal output unit, the device is provided with a machine frame, and a bottom plate is arranged in the machine frame. The bottom plate is provided with an integrated circuit board comprising a power supply unit, a central processing unit and a pulse signal output unit, a beam combiner is arranged beside the integrated circuit board, the beam combiner is connected with a coaxial refrigeration laser placed on a circuit board, a shell of the machine frame is provided with a front panel, the front panel is provided with a power supply interface, a communication COM port, an NTC interface, an SMA interface and an optical fiber outlet, and the power supply interface is connected with the central processing unit. The optical fiber outlet is communicated with the beam combiner, and the bottom plate and the shell are integrally manufactured. The circuit is applied to a distributed optical fiber temperature measurement laser device, and can solve the problems that a common distributed optical fiber temperature measurement laser device is not long enough in measurement distance, large in power consumption and not resistant to electromagnetic interference.

This invention belongs to the field of power electronics and semiconductor device technology, and proposes a high-precision comparison method for transistor on-resistance. The method includes: generating and outputting a DC voltage capable of rapid adjustment and load-bearing capacity via a DC voltage adjustment module; generating and outputting a rapidly adjustable pulse signal based on the DC voltage and a pulse voltage via a gate drive module; applying the pulse signal to the transistor under test (TUT) via a power module and measuring the TUT's on-resistance under the gate drive voltage; switching the gate drive voltage within a delay on the order of microseconds to nanoseconds, and measuring the TUT's on-resistance under the switched gate drive voltage based on the pulse signal. This method can test the on-resistance of TUTs under different gate drive voltages in a pulse circuit, reducing the measurement delay from several minutes in traditional dual-pulse circuits to several nanoseconds, effectively improving the performance of transistor reliability evaluation circuits.

The invention discloses a pulse generator and a pulse bar, and relates to the technical field of pulse circuits, the pulse generator comprises a frequency regulation and control unit, a double closed-loop pulse amplification unit, a digital signal processing unit and a self-adaptive power management unit, the frequency regulation and control unit comprises an environment sensor and a microcontroller, the microcontroller can calculate a preset pulse frequency according to information transmitted by the environment sensor; the input end of the double closed-loop pulse amplification unit can receive a pulse signal transmitted by the microcontroller, amplify the pulse signal to a preset pulse frequency and provide pulse current for the static elimination needle; the digital signal processing unit can carry out digital processing on the pulse signal and enhance the anti-interference capability of the pulse signal; the self-adaptive power management unit comprises a dynamic voltage regulation module electrically connected with an external power supply, and the dynamic voltage regulation module can dynamically regulate output voltage; according to the technical scheme provided by the invention, the pulse generator which is high in stability, wide in adjustment range and high in anti-interference capability can be provided.

This invention belongs to the field of power semiconductor technology and relates to an MCT series pulse circuit. This invention employs a MOS-controlled thyristor with a cathode short-circuit structure, combining the simplicity of the MOSFET gate control circuit with the excellent surge current capability of the thyristor to provide high di / dt and high peak current. This invention uses a standard 1700V MCT device in series, combined with a voltage equalization circuit, to achieve static withstand voltage and dynamic voltage balance during MCT turn-on in an ultra-high voltage capacitive pulse circuit. Simultaneously, the drive signal output from the driver chip is transmitted to the MCT gate circuit via magnetic coupling, and then modulated by the MCT gate circuit to achieve synchronous transmission of the drive signal and synchronous conduction of the MCT, reducing the asynchrony of the series MCT turn-on and preventing voltage imbalance caused by inconsistent MCT turn-on, which could damage the device. The MCT series circuit in this invention has high synchronization and high cascading capability, allowing for multi-stage series connection to achieve ultra-high voltage series pulses.

The present application belongs to the technical field of electromagnetic relay detection, and discloses a method and device for testing the anti-interference sensitivity of an electromagnetic relay, which comprises inputting a pulse voltage to the relay coil, monitoring and recording the pulse time value at the instant when the normally closed contact of the relay is separated, and the device comprises a coil power supply, a pulse circuit and a time base timer, the coil power supply comprises a voltage adjustment circuit, the pulse circuit is electrically connected with the time base timer and used for generating a voltage pulse and applying the voltage pulse to the input end of the relay coil, and the time base timer comprises a single-chip microcomputer and a high-frequency clock circuit electrically connected with the single-chip microcomputer and used for generating a voltage pulse to drive the relay coil, when the electromagnetic relay is attracted, the single-chip microcomputer monitors the pulse time value at the instant when the normally closed contact JC is separated. The present application can obtain the voltage value and the duration of the electromagnetic relay without malfunction after the relay is connected with an interference signal, and can provide quantitative parameter guarantee for producing high-quality electromagnetic relay products.

A device includes a photodiode performing avalanche multiplication, a recharge circuit, a control signal generation circuit that generates a control signal to control the recharge circuit, a pulse counting circuit that generates a pulse signal from a signal output by the photodiode, and a counter that counts the pulse signal output by the pulse counting circuit. The control signal generation circuit is configured to output, based on a clock signal and a mask signal, the first-period control signal and the second-period control signal, which is longer than the first period. When a counter value reaches a threshold, the signal output by the control signal generation circuit can be switched from the first-period control signal to the second-period control signal.

An apparatus has a phase lock loop with an adaptive loop filter that has a reset circuit controlled by a power gating pulse circuit.

The invention discloses a trigger pulse circuit and system, and relates to the field of measurement, and a time-delay controllable trigger circuit arranged in the trigger pulse circuit can convert a received CMOS level trigger signal into a CMOS level trigger pulse signal which can be recognized by a neutron generator high-voltage circuit when a first preset time after power-on is reached. And the neutron generator high-voltage circuit generates a neutron targeting pulse signal after receiving the CMOS level trigger pulse signal and transmits the neutron targeting pulse signal to the neutron tube, so that the neutron targeting operation can be carried out only when the storage type logging instrument is electrified for a first preset time. Neutron targeting caused by abnormal work of the storage type PNN logging instrument on the ground can be prevented, personal injury is completely eradicated, and the safety of the scheme is improved.